JPWO2006054373A1 - Sewage treatment apparatus and method - Google Patents

Abstract

The present invention relates to rainwater-mixed sewage or pollutant-mixed stormwater that is discharged without passing through a sewage treatment plant when a large amount of rainfall occurs, that is, combined sewer overflow (CSO), split-type sewer stormwater overflow, Providing a sewer system with a means to quickly disinfect sewer overflow, etc. before being released to public water areas, and a method and apparatus for disinfecting rainwater mixed with rainwater or contaminated rainwater To do. One aspect of the present invention is a sewage system, and when sewage that does not exceed the treatment capacity of the sewage treatment plant flows into the sewage treatment plant, the sewage is subjected to predetermined treatment in the sewage treatment plant, After disinfecting with chlorinated disinfectant and then releasing it to public waters, and when there is a possibility that sewage containing rainwater that exceeds the capacity of the sewage treatment plant will flow into the sewage treatment plant or may flow into it. For sewage mixed with rainwater exceeding the capacity of the sewage treatment plant, it is branched off at the sewer stormwater overflow drainage facility, disinfected with a bromine-based disinfectant, and then discharged into public waters for sewage treatment. For sewage mixed with rainwater within the treatment capacity of the plant, after the prescribed treatment at the sewage treatment plant, the sterilization treatment is performed with a chlorinated disinfectant and then discharged into public water areas. Sewer system to be related to.

Description

  The present invention relates to a method and apparatus for disinfecting drainage, and in particular, sewage diluted with rainwater, specifically combined sewer stormwater overflow, diverted sewer stormwater overflow or diversion. The present invention relates to a method and apparatus for disinfecting sewage sewage overflow water, and a sewer system equipped with such a disinfecting apparatus.

  In cities, domestic sewage and industrial wastewater are sent to a sewage treatment plant by combined sewerage or shunt sewerage, and are used for sedimentation basins for removing sand, etc., and solids for removing suspended solids (SS). Liquid separation treatment, activated sludge treatment, and then disinfection are performed in this order, and then discharged into public water such as rivers, lakes, harbors, and coastal waters.

  And generally as disinfection, disinfecting with chlorine gas or a chlorine-type disinfectant is common. This is because sewage, human waste, industrial wastewater, and the like may contain pathogenic bacteria that are a source of infectious diseases. In general, a chlorine-based disinfectant is added to reduce the number of coliforms per 1 mL (the number of E. coli) to 3000 or less (CFU / mL). In some cases, ultraviolet irradiation or ozone addition may be performed without adding a chlorine-based disinfectant, but the use is limited because the facilities are enormous.

  However, when there is a large amount of rainfall, due to problems with the capacity of the sewage treatment plant, sewage mixed with rainwater without passing through various treatments and disinfection at the sewage treatment plant or rainwater mixed with various pollutants A situation occurs that must be released. It is important to sterilize sewage mixed with rainwater and polluted rainwater discharged to public waters during rainy weather before being discharged into public waters.

  The present invention is simple in which a large amount of rainfall is mixed with sewage mixed with rainwater and polluted substances discharged without passing through a sewage treatment plant, or rainwater discharged without passing through biological treatment and disinfection treatment in a sewage treatment plant. Provided are a sewer system provided with means for quickly disinfecting discharged water before being discharged into public water areas, and a method and apparatus for disinfecting rainwater mixed sewage and contaminated rainwater.

It is a flowchart which shows the typical structural example of a combined sewer. It is a flowchart which shows the typical structural example of a diversion sewer. It is a flowchart which shows the typical structural example of a sewage treatment plant. It is a figure which shows the structural example of the sewage treatment apparatus concerning 1 aspect of this invention. It is a figure which shows the structural example of the sewage treatment apparatus concerning 1 aspect of this invention. It is a figure which shows the structural example of the sewage treatment apparatus concerning 1 aspect of this invention. It is a figure which shows the structural example of the sewage treatment apparatus concerning 1 aspect of this invention. It is a figure which shows the structural example of the sewage treatment apparatus concerning 1 aspect of this invention. It is a schematic explanatory drawing explaining the disinfection apparatus concerning one Embodiment of this invention. It is a schematic explanatory drawing explaining one form of this invention which throws a disinfectant into a sand basin. It is a schematic explanatory drawing which shows the other form of this invention. It is a schematic explanatory drawing which shows one embodiment of the addition apparatus for adding disinfecting water to the sewer stormwater overflow. It is a schematic explanatory drawing which shows the other form which can be employ | adopted as a storage and supply apparatus of a disinfectant. It is a figure which shows the specific structural example of the storage part of a solid disinfectant. It is a figure which shows one form of a solid disinfectant storage tank. It is a figure which shows one form of a solid disinfectant storage tank. It is a figure which shows one form of a fixed amount feeder. It is a figure which shows one form of a fixed amount feeder. It is a figure which shows the form which connected the container to the solid disinfectant storage tank. It is a figure explaining the structural example of a solid disinfectant container. It is a figure explaining an example of the installation form of a solid disinfectant supply equipment. It is a figure explaining the other form of the container which accommodated the solid disinfectant. It is a figure which shows the other structural example of the melt | dissolution part which melt | dissolves a solid disinfectant in water and forms disinfectant water. It is a figure which shows the solid bromine-type disinfectant storage and supply apparatus of the other form which can be used in this invention. It is a figure which shows the solid bromine-type disinfectant storage and supply apparatus of the other form which can be used in this invention. It is a figure which shows the other example of the solid bromine-type disinfectant storage and supply apparatus using the uniaxial screw type pump for fluid and powder transfer. It is a figure which shows one specific example of the disinfecting apparatus which concerns on one aspect | mode of this invention which throws a solid bromine-type disinfectant into the sewer stormwater overflow to be processed with solid. It is a figure which shows one form of the disinfectant injection device. It is a figure which shows the other form of a disinfectant injection device. It is a figure which shows the other form of a disinfectant injection device. It is a graph which shows the time transition of undissolved disinfectant residual ratio, residual halogen concentration, and the number of coliform bacteria after throwing a solid disinfectant into sewer overflow in rainy weather. It is a figure which shows the concept of the disinfection apparatus of the sewer stormwater overflow concerning the other aspect of this invention. It is a figure which shows the form which changed the shape of the flow path of the sewer stormwater overflow after adding a disinfectant. It is a figure which shows the other form which changed the shape of the flow path 507 of the sewer stormwater overflow after adding a disinfectant. It is a figure which shows the other form which changed the shape of the flow path 507 of the sewer stormwater overflow after adding a disinfectant. It is a figure which shows the concept of one form of the disinfection apparatus which throws a solid disinfectant into the sewer stormwater overflow to be processed. It is a figure which shows the other structural example of the disinfection apparatus of the system which throws in a solid bromine-type disinfectant into the sewer stormwater overflow to be processed, and performs disinfection. It is a figure which shows the other structural example of the disinfection apparatus of the system which throws in a solid bromine-type disinfectant into the sewer stormwater overflow to be processed, and performs disinfection. It is a graph which shows the relationship between the elapsed time after rainfall, and the number of coliform bacteria after disinfection when a predetermined amount of halogen-based disinfectant is added to rainwater overflow in a sewage treatment facility. 40 is a graph showing the number of coliform bacteria after sterilization when halogen-based disinfectants having various concentrations are added to sewage in rainy weather after 0.5 hours have passed since rain (point A in FIG. 39). FIG. 40 is a graph showing the number of coliform bacteria after disinfection when halogen-based disinfectants having various concentrations are added to sewage in rainy weather after 45 minutes from rain (point B in FIG. 39). FIG. 40 is a graph showing the number of coliform bacteria after disinfection when halogen-based disinfectants having various concentrations are added to sewage in rainy weather after 1.5 hours have elapsed since rain (point C in FIG. 39). It is a graph which shows the relationship between the elapsed time after disinfection agent addition, and the residual halogen density | concentration in a to-be-processed liquid at the time of adding a halogen-type disinfectant with respect to the rainwater overflowing time in various elapsed time after rainfall. It is a figure which shows the structural example of the disinfection apparatus of the sewer stormwater overflow which concerns on 1 aspect of this invention. It is a figure explaining one form of this invention which performs the process which adds a reducing agent with respect to the sewer stormwater overflow to which the disinfectant was added. It is a figure which shows the sewer pipe network which collects the waste_water | drain which the disinfection apparatus disinfects, and a processing area. It is a figure which shows the sewer network which collects the waste_water | drain which the disinfection apparatus disinfects, a process area, and an adjacent process area. It is a figure which shows the structural example of the control apparatus of the sewer sewage overflow water disinfection apparatus which concerns on this invention. It is a figure which shows the mapping process used for the control method of the sewer stormwater overflow disinfection apparatus concerning this invention, The figure (a) is the rain information measured in each process area A, B, C, D, E, X. (B) is a schematic diagram after time t in FIG. (A). It is a figure which shows the other structural example of the control apparatus of the sewer sewage overflow water disinfection apparatus concerning the present invention. It is a figure which shows the other structural example of the control apparatus of the sewer sewage overflow water disinfection apparatus concerning the present invention. It is a systematic diagram which shows the state by which disinfection is performed by one Embodiment of the waste water disinfection apparatus which has an abnormality detection mechanism concerning this invention. It is a figure which shows the process sequence which detects the excess and the smallness of a chemical | medical agent addition amount. It is a figure which shows the process sequence which detects the excess and the smallness of a chemical | medical agent addition amount. It is a figure which shows the process sequence which detects the excess of chemical | medical agent addition amount. It is a figure which shows the concept of the control apparatus which detects the abnormal supply of a solid disinfectant and stops supply. It is a figure explaining one form of the operation | movement method of the apparatus which disinfects the sewer stormwater overflow by the solid bromine type disinfectant by this invention. It is a conceptual diagram which shows an example of the control system of the disinfection system of the sewer stormwater overflow concerning this invention. It is a figure which shows the structure of the disinfection apparatus of the sewer stormwater overflow used in Example 4. 10 is a graph showing the results of Example 5.

  In FIG. 46, 710 is a treatment plant, 711 is a sewer pipe, and P1, P2, and P3 are relay pumps.

  In FIG. 48, reference numeral 710 is a treatment site, 720 is rainfall information measuring means, 721a is rainfall information of the processing area A, 722a is rainfall information of the processing area A, 730 is a control device, 731 is rainfall information mapping processing means, and 732 is rainfall. Information estimation processing means, 733 is expected rainfall, 734 is expected rainfall intensity, 735 is expected inflow, 736 is coliform group number estimation processing means, 737 is predicted value / actual value correction processing means, 741 is drug addition amount, 742 Is the chemical consumption, 743 is the drainage disinfection operation start time, 750 is the turbidity measuring means, 751 is the influent water turbidity, 752 is the actual value measuring means, 753 is the rainfall amount, 754 is the rainfall intensity, 755 is the inflow water amount, Reference numeral 756 denotes a chemical supply amount, and reference numeral 757 denotes a discharged water residual chemical concentration.

  In FIG. 50, reference numeral 710 is a treatment site, 720 is rainfall information measuring means, 721x is rainfall information of the processing area X, 722x is rainfall information of the processing area X, 730 is a control device, 731 is rainfall information mapping processing means, and 732 is rainfall. Information estimation processing means, 733 is expected rainfall, 734 is expected rainfall intensity, 735 is expected inflow, 736 is E. coli group number estimation processing means, 737 is predicted value / actual value correction processing means, and 737a to 737c are correction value additions Processing means, 741 is the amount of drug added, 742 is the amount of drug consumed, 743 is the drainage disinfection start time, 750 is the turbidity measuring means, 751 is the influent water turbidity, 752 is the actual value measuring means, 753 is the rainfall, 754 is rainfall intensity, 755 is the inflow water amount, 756 is the chemical supply amount, 757 is the concentration of residual chemical in the effluent water, 760 is the regional characteristic simulation means, and 761 is the forecast Input water, 762 are expected inflow pollution loads.

  In FIG. 51, reference numeral 710 denotes a processing site, 720 denotes rainfall information measuring means, 721x denotes rainfall information about the processing area X, 722x denotes rainfall information about the processing area X, 730 denotes a control device, 737 denotes a predicted value / actual value correction processing means, 737a and 737b are correction value addition processing means, 738 is a medicine addition amount calculation processing means, 739 is a medicine addition rate setting means, 741 is a medicine addition amount, 742 is a medicine consumption, 752 is a measured value measurement means, and 753 is a rainfall amount. , 754 is the rainfall intensity, 755 is the inflow water amount, 756 is the chemical supply amount, 757 is the residual chemical concentration of the discharged water, 760 is the regional characteristic simulation means, 761 is the expected inflow water amount, and 762 is the expected inflow pollution load.

  In FIG. 52, 810 is a sand basin, 810a is an inflow portion, 810b is a sand settling portion, 811 is a discharge channel, 812 is a river, 813 is a discharge water residual halogen concentration meter, 814 is a discharge port monitoring camera, 820 is a screen, and 821 is a screen. Raw water flow meter, 830 is a disinfectant addition device, 831 is a hopper, 832 is a disinfectant, 833 is a feeder, 834 is an ejector, 835 is a hopper weight, 836 is the number of revolutions of the feeder, 840 is a dissolution device, and 841 is a dissolution tank , 842 is a stirrer, 843 is a dissolution tank residual halogen concentration meter, and X1 is a hopper weight meter.

  In FIG. 53, 813 is a residual water residual halogen concentration meter, 843 is a dissolution tank residual halogen concentration meter, 870 is a residual halogen high level determination output, 871 is a residual halogen low level determination output, and 901 is a high level of residual water residual halogen concentration. Threshold is a dissolution tank residual halogen concentration low level threshold, 903 is a dissolution tank residual halogen concentration high level threshold, and 904 is a residual halogen concentration difference (disinfectant consumption) low level threshold.

  In FIG. 54, 835 is a hopper weigh scale, 836 is a supply machine rotation speed, 881 is a drug addition amount under-determination output, 883 is a drug addition amount over-determination output, 910 is a supply machine rotation speed → discharge amount conversion coefficient, and 911 is a drug The discharge amount addition amount low level threshold value, 912 is a drug discharge amount addition amount high level threshold value, and 913 is a drug discharge amount determination processing sampling cycle.

  In FIG. 55, 814 is a discharge port monitoring camera, 890 is a fish abnormality determination output, 921 is a fish determination pattern, 922 is a fish drift determination movement range coordinate 1, 923 is a fish drift determination movement range coordinate 2, and 924 is a fish drift. The determination time, 925, is a drifting fish population high level threshold.

  In FIG. 59, 551 is a disinfectant storage tank, 552 is disinfectant metering means, 553 is disinfectant transfer piping, 554 is disinfectant mixing means, 555 is dry air supply means, 556 is dust removal means, 557 is water to be disinfected, 559 is a solid bromine-based disinfectant, and 560 is a pressure adjusting means.

BEST MODE FOR CARRYING OUT THE INVENTION

  “Combined sewer” is a system that collects domestic sewage and industrial wastewater and rainwater in the same pipe and sends them to the sewage treatment plant. Each process such as the removal of suspended solids by the biological treatment, biological treatment by the aeration tank, removal of sludge by the final sedimentation basin, and disinfection by the chlorine-based disinfectant are performed. A typical configuration example of a combined sewer system is shown in FIG. Sewage discharged from sewage discharge sources such as general households and factories is collected in sewer pipes. Rainwater is also collected in the same sewer pipe via the rainwater ditch. The sewage and rainwater collected in the sewer pipes in this way are sent to a sewage treatment plant, and after passing through precipitation treatment, aeration (biological reaction) treatment, final precipitation treatment, disinfection treatment, etc., to the public water area It is released. Public waters include rivers, lakes, harbors and coastal waters. However, when there is a large amount of rainfall, there is a risk that rainwater-mixed sewage will flow in that exceeds the amount that can be treated at the sewage treatment plant. For this reason, facilities for removing rainwater-mixed sewage such as a rainwater discharge chamber and a pumping station (drainage station) are provided in the middle of the sewer pipe. In the rain spout chamber, in some cases, a filter screen or the like is installed to remove contaminants, and then overflow water is discharged. The pumping station is usually equipped with a sand basin, and the sewage mixed with rainwater is discharged after being simply treated by the sand basin. Such sewage effluent discharged during rainy weather is generally called combined sewer overflow (CSO).

  On the other hand, “separated sewer” means collecting domestic sewage and industrial effluent and rainwater in separate pipes, sending domestic sewage and industrial effluent to a sewage treatment plant, and releasing rainwater into public water bodies. It is a method to do. A typical configuration example of the diversion sewer system is shown in FIG. Sewage discharged from sewage discharge sources such as general households and factories is collected in a sewage pipe of a sewerage sewer, sent to a sewage treatment plant, and discharged into a public water area through a predetermined treatment. On the other hand, rainwater is collected in rainwater pipes of a sewerage sewer through a rainwater ditch, etc., and discharged into public water areas from pump stations (drainage station) installed at multiple locations on the rainwater pipe. In such a diversion sewer, the stormwater overflow of the diversion sewer discharged from the pump station of the stormwater pipe should originally contain only rainwater. However, in reality, when a large amount of rain falls, a large amount of rainwater flows through the sewer, and at this time, pollutants present on the ground such as roads and sludge accumulated in the sewer are also brought together. It will be washed away. Therefore, the rainwater overflow water of the sewerage sewer system may contain E. coli caused by contaminants and sludge existing on the ground surface.

  In any of the above-mentioned combined sewer stormwater overflow and diversion sewer stormwater overflow, the number of coliforms in the overflow water may exceed the discharge regulation value (3000 CFU / mL or less) and may be disinfected. Desired. Here, CFU means a colony forming unit.

  A typical configuration example of a sewage treatment plant is shown in FIG. The sewage sent from the sewage pipe is introduced into the sewage treatment plant by a pump and processed in the first sedimentation basin (primary sedimentation basin), and impurities and suspended solids are removed by sedimentation. Next, after biological treatment is performed in an aeration tank, sedimentation is performed in a final sedimentation tank to separate sludge, and then treated water is sterilized in a disinfection tank (chlorine mixing tank). The treated water may be disinfected by UV irradiation instead of or in combination with a chlorine mixing tank. What passed through this series of treatment is discharged into public water as treated sewage. However, in the case of a combined sewer system, rainwater and sewage flow together in the sewer pipe, so when there is a large amount of rain, an amount of sewage mixed with rainwater may exceed the treatment capacity of the sewage treatment plant. . In this case, some sewage may be removed and discharged into public water areas at the pumping pump station. Further, the treatment capacity of the first sedimentation basin is generally different from the treatment capacity of the aeration tank, and the treatment capacity of the aeration tank is smaller. Therefore, if the amount of sewage that is within the treatment capacity of the first settling basin but exceeds the treatment capacity of the aeration tank is introduced into the sewage treatment plant, a part of the sewage is eliminated before introducing the sewage into the aeration tank. In some cases, after simple treatment in a disinfection tank (chlorine mixing tank and / or UV irradiation tank), it is discharged into public water areas. Also, depending on the sewage treatment plant, there may be no space for installing a disinfecting tank for the discharged water. In such a case, it may be discharged into a public water area without being treated. Such sewage sewage discharge water in the sewage treatment plant is also called combined sewer overflow (CSO), and its disinfection treatment is an important issue.

  In addition, the sewage pipes of the sewerage sewerage should originally only flow sewage, and the amount of sewage flowing through the sewage pipes will not increase even during heavy rainfall. However, in reality, a considerable amount of unknown water has entered the sewage pipe basin of the diversion sewer, and there is sewage that overflows from the sewage pipe basin and is discharged into the public water area. This is called sanitary sewer overflow (SSO) in a sewer system, and its disinfection treatment is an important issue.

  One aspect of the present invention is a means for quickly disinfecting these combined sewer stormwater overflow, diverted sewer stormwater overflow, and diverted sewer sewage overflow water (disinfection apparatus according to the present invention shown in FIGS. 1 to 3). Provide a sewer system equipped.

  That is, according to the present invention, when the amount of sewage that does not exceed the treatment capacity of the sewage treatment plant flows into the sewage treatment plant at the time of fine weather or a small amount of rain, the sewage is first settling in the sewage treatment plant. After performing predetermined treatments such as aeration tanks and final sedimentation basins, disinfecting with chlorinated disinfectant and / or UV irradiation and then discharging into public water areas, but the treatment capacity of the sewage treatment plant due to heavy rainfall If there is a possibility that sewage containing more than the amount of rainwater will flow into the sewage treatment plant or there is a risk of stormwater flowing into the sewage treatment plant, the sewer sewage overflow in the sewer pipeline will be used for sewage mixed with stormwater that exceeds the treatment capacity of the sewage treatment plant. For example, after branching at a drainage facility, such as a rainwater discharge chamber, a pumping station (drainage station), or a pumping pumping station of a sewage treatment plant, disinfecting with a bromine-based disinfectant and then discharging it into public water areas, the sewage treatment plant For sewage mixed with rainwater within the capacity, after performing predetermined treatments such as the first sedimentation tank, aeration tank, and final sedimentation tank at the sewage treatment plant, disinfecting with chlorine-based disinfectant and / or UV irradiation, the public A sewer system is provided which is characterized by being discharged into water.

  Further, according to another embodiment of the present invention, the sewage flowing through the sewer pipe of the sewer system is a predetermined treatment such as a first settling basin, an aeration tank, and a final settling basin at a sewage treatment plant. After performing sterilization treatment by chlorine-based disinfectant and / or UV irradiation, the rainwater flowing through sewer storm sewers is publicized from rainwater drainage facilities such as pump stations (drainage stations). When it is discharged into the water area, but it needs to be disinfected immediately after the rain called “first flush” or a large amount of rain, etc., the rainwater flowing through the sewer storm sewer was disinfected with a bromine-based disinfectant at the rainwater drainage facility. A sewer system is provided which is characterized by later discharge into public waters.

  Further, according to another aspect of the present invention, when the amount of sewage that does not exceed the treatment capacity of the aeration tank of the sewage treatment plant flows into the sewage treatment plant during fine weather or a small amount of rain, In a treatment plant, after performing predetermined treatment such as first sedimentation tank, aeration tank, final sedimentation tank, etc., after disinfection treatment with chlorinated disinfectant and / or UV irradiation, it is discharged into public waters. If the sewage containing the amount of rainwater that does not exceed the treatment capacity of the first settling basin of the sewage treatment plant but exceeds the treatment capacity of the aeration tank flows into or may flow into the sewage treatment plant, the treatment capacity of the aeration tank For sewage mixed with stormwater, the water will be branched after treatment in the first sedimentation basin at the sewage treatment plant, disinfected with a bromine-based disinfectant, then discharged into public water, and rainwater within the treatment capacity of the aeration tank. In mixed sewage In addition, after the treatment in the first sedimentation basin at the sewage treatment plant, predetermined treatments such as an aeration tank and final sedimentation basin are performed, followed by disinfection treatment with a chlorine-based disinfectant and / or UV irradiation. A sewer system is provided which is characterized by being discharged into water.

  Moreover, the other aspect of this invention provides the apparatus for disinfecting the above-mentioned combined-type sewer sewage overflow, split-type sewer stormwater overflow, or split-type sewer sewage overflow. In one aspect, the apparatus includes a solid bromine-based disinfectant storage / supply device, and a solid bromine-based disinfectant supplied from the solid bromine-based disinfectant storage / supply device. Disinfectant addition / mixing device added to and mixed with sewer stormwater overflow and diversion sewer sewage overflow.

  As explained above, the treated water targeted by the present invention is sewage mixed with rainwater that would be discharged into public water areas without proper treatment at the sewage treatment plant when there is a large amount of rain in the combined sewerage system. In other words, in the combined sewer overflow (CSO), in the sewer sewer, the rainwater containing pollutants released from the rainwater pipe into the public water area during rainfall, that is, in the sewer sewer stormwater overflow, the sewer sewer Examples include sewage containing unknown water discharged into public water areas, that is, sewer sewage overflow (SSO). In the following description, these combined sewer stormwater overflow, diverted sewer stormwater overflow or diverted sewer sewage overflow water will be collectively referred to as sewer stormwater overflow. In the description of the present specification, the water to be disinfected by the present invention is sometimes referred to as sewer stormwater overflow, but this description does not limit the present invention.

  The concept of the present invention described above can also be defined as shown in FIG. In FIG. 4, sewage flows into the branching device. When the inflowing sewage is less than or equal to a predetermined value, the inflowing sewage flows out from the outlet 1, and the sewage flowing out from the outlet 1 is sent to a disinfection facility having a disinfection tank that is disinfected with chlorine or UV to be sterilized. Disinfected sewage can be discharged into public waters. When the amount of inflow sewage is greater than or equal to a predetermined value, the amount of inflow sewage less than or equal to a predetermined value flows out from the outlet 1 and is processed in the same manner as above. A sewage amount obtained by subtracting a predetermined amount of sewage from the inflow sewage amount flows out from the outlet 2 and is sent to a bromine sewage disinfection device that disinfects the sewage with a bromine disinfectant, and is subjected to disinfection treatment with the bromine disinfectant. Sewage that has been disinfected by bromine sewage disinfection equipment can also be discharged into public waters. Here, the predetermined value is, for example, the processing capacity of the sewage treatment plant, or the processing capacity of the aeration tank in the case of branching between the first sedimentation tank and the aeration tank in the sewage treatment plant as shown in FIG. Point to.

That is, another aspect of the present invention provides:
A disinfection facility having a disinfection tank for disinfecting sewage with chlorine or UV;
A bromine sewage treatment device for disinfecting sewage with a bromine-based disinfectant;
A branching device that has an inlet, an outlet 1 and an outlet 2 and divides the inflowing sewage into the outlet 1 and the outlet 2, and when the inflowing sewage amount to the inlet is less than a predetermined value, A branching device that flows to the outlet 1 and, when the inflow sewage amount is greater than or equal to a predetermined value, causes the sewage amount to flow to the outlet 1 and flows the sewage amount obtained by removing the sewage amount from the inflow sewage amount to the outlet 2; ;
Consisting of
The present invention relates to a sewage treatment apparatus in which an outlet 1 of the branch device is connected to a sewage introduction section of the sterilization facility, and an outlet 2 of the branch apparatus is connected to a sewage introduction section of the bromine sewage treatment apparatus.

  In the above aspect, when the inflow sewage amount is equal to or greater than a predetermined value, the sewage amount obtained by removing the sewage amount from the inflow sewage amount (the sewage amount flowing out from the outlet 2 of the branching device) is the sewerage system in the rainy weather described above. It can be thought of as the concept of overflow water.

  An example of the disinfection facility is a sewage treatment plant. As shown in FIG. 5, the disinfection facility further has an initial settling basin, and the sewage introduction section of the first settling basin is connected to the introduction section of the sterilization facility, and the outlet of the first settling basin is connected to the sewage introduction section of the disinfection tank. Can be done. Furthermore, as shown in FIG. 6, the disinfection facility further includes an initial settling basin, a basin tank, and a final settling basin, and a sewage introduction section for the first settling basin is connected to the introduction section of the disinfection facility, Make sure that the outlet is connected to the sewage introduction section of the flash tank, the outlet of the flash tank is connected to the sewage introduction section of the final sedimentation tank, and the exit of the final sedimentation tank is connected to the sewage introduction section of the disinfection tank You can also.

  Further, a branching device and a bromine disinfection device are also arranged in the disinfection facility, and when inflow water of a predetermined value or more flows, the excess can be branched and disinfected by the bromine disinfection device. In other words, according to another aspect of the present invention, the disinfection facility further includes an initial settling basin, an inlet and an outlet 1 and an outlet 2, and the effluent water from the first settling basin is received at the entrance to the outlet 1 and the outlet 2. When the amount of water flowing into the branching device is equal to or less than a predetermined value, the entire amount of water flowing into the outlet 1 is allowed to flow to the outlet 1. And a bronze sewage treatment device that disinfects sewage with a bromine-based disinfectant, and the first settling basin at the introduction of the disinfection facility. The outlet of the first sedimentation tank is connected to the inlet of the branching device, the outlet 1 of the branching device is connected to the sewage introducing portion of the disinfection tank, and the outlet 2 of the branching device is the sewage of the bromine sewage treatment device. The present invention relates to the above-described sewage treatment apparatus connected to the introduction section. A configuration example of this form is shown in FIG. Further, according to another aspect of the present invention, the disinfection facility further includes a first settling basin, a batch tank, a final settling basin, an inlet and an outlet 1 and an outlet 2, and effluent water from the first basin. Is divided into an outlet 1 and an outlet 2, and when the amount of water flowing into the branching device is below a predetermined value, the entire amount of the inflowing water flows to the outlet 1, and the amount of inflowing water exceeds the predetermined value. In some cases, a branching device for flowing a predetermined amount of water to the outlet 1 and removing the predetermined amount of water from the inflowing water amount to the outlet 2, and a bromine sewage treatment device (device) for disinfecting sewage with a bromine-based disinfectant The sewage introduction part of the first sedimentation basin is connected to the introduction part of the disinfection facility, the outlet of the first sedimentation basin is connected to the inlet of the branching device, and the outlet 1 of the branching device is connected to the sewage introduction part of the flash tank. Connected, the outlet of the tank is connected to the sewage introduction section of the final sedimentation basin, and the final sedimentation basin exit There is connected to the sewage inlet portion of the sterilization bath, to sewage treatment apparatus according to the exit 2 of the branching unit is connected to the sewage inlet portion of bromine sewage treatment apparatus. A configuration example of this form is shown in FIG.

Furthermore, the structure which arrange | positioned the apparatus containing the branch apparatus and bromine sewage disinfection apparatus shown in FIG. 7 or FIG. 8 only in the disinfection facility is also included in one aspect of the present invention. That is, another aspect of the present invention is a sewage treatment apparatus in a sewage treatment plant,
First sedimentation basin;
A disinfection facility having a disinfection tank for disinfecting sewage with chlorine or UV;
A bromine sewage treatment device for disinfecting sewage with a bromine-based disinfectant;
A branching device that has an inlet, an outlet 1 and an outlet 2 and receives the outflow water from the first sedimentation basin at the inlet and divides it into the outlet 1 and the outlet 2, and the amount of inflow water to the branching device is below a predetermined value Is a branching device that causes the entire amount of inflow water to flow to the outlet 1, and if the inflow water amount is greater than or equal to a predetermined value, causes the predetermined amount of water to flow to the outlet 1, and flows the water amount obtained by removing the predetermined amount of water from the inflow water amount to the outlet 2 And consist of
The present invention relates to a sewage treatment apparatus characterized in that an outlet 1 of a branching device is connected to a sewage introduction part of a disinfection facility, and an outlet 2 of the branching apparatus is connected to a sewage introduction part of a bromine sewage treatment apparatus.

Furthermore, another aspect of the present invention is a sewage treatment apparatus in a sewage treatment plant,
First sedimentation basin;
With a tank;
The final sedimentation basin;
A disinfection facility having a disinfection tank for disinfecting sewage with chlorine or UV;
A bromine sewage treatment device for disinfecting sewage with a bromine-based disinfectant;
A branching device having an inlet, an outlet 1 and an outlet 2 that receives the effluent water from the first sedimentation basin and separates it into the outlet 1 and the outlet 2. A diverter that causes the entire amount to flow to the outlet 1, and if the inflow water amount is greater than or equal to a predetermined value, causes the predetermined amount of water to flow to the outlet 1, and removes the predetermined amount of water from the inflow water amount to the outlet 2; ,
The sewage introduction part of the first sedimentation basin is connected to the introduction part of the sewage treatment device, the outlet of the first sedimentation basin is connected to the inlet of the branching device, and the outlet 1 of the branching device is connected to the sewage introduction part of the flash tank. The outlet of the tank is connected to the sewage introduction part of the final sedimentation basin, the exit of the final sedimentation basin is connected to the sewage introduction part of the disinfection facility, and the outlet 2 of the branching device is connected to the sewage introduction part of the bromine sewage treatment device The present invention relates to a sewage treatment apparatus.

  In the sewage treatment apparatus described above, the number of coliforms in the sewage can be reduced to 3000 or less per 1 cc of sewage by the disinfection facility. Moreover, the number of E. coli in sewage can be reduced to 200 or less per 100 cc of sewage by disinfection facilities. Furthermore, the entrance of the branching device can be connected to a combined sewer. In addition, the bromine sewage treatment apparatus can reduce the number of coliform bacteria in sewage to 3000 or less per 1 cc of sewage. Furthermore, the bromine sewage treatment apparatus can reduce the number of E. coli in sewage to 200 or less per 100 cc of sewage. Sewage sterilized by a disinfection facility and / or bromine sewage treatment device can flow to public water bodies. In the sewage treatment apparatus defined above, the bromine sewage treatment apparatus comprises a storage / supply device for a solid bromine-based disinfectant and a solid bromine-based disinfectant supplied from the storage / supply device for the solid bromine-based disinfectant. And a disinfectant addition / mixing device for adding / mixing to the water to be treated. The storage and supply device for the solid bromine-based disinfectant includes a storage tank for the solid bromine-based disinfectant and a quantitative supply device for measuring and discharging a predetermined amount of the solid bromine-based disinfectant in the storage tank. The metering feeder can be equipped with a solid bromine-based disinfectant agitation means composed of a plurality of injection ports for injecting compressed air into the inside thereof. Moreover, the fixed quantity feeder can be provided with a rotary table having a weighing means. Further, the disinfectant addition / mixing device includes a disinfecting water preparation device that receives a part of the water to be treated and mixes / dissolves the solid bromine-based disinfectant, and a unit for introducing the disinfecting water into the water to be treated. Can do. Furthermore, the disinfectant addition / mixing device can be installed in a flow path through which water to be treated flows. Furthermore, the storage / mixing device and the addition / mixing device for the solid bromine-based disinfectant are connected to the storage tank for storing the solid bromine-based disinfectant and the storage tank, and the disinfectant is transferred to the injection point while remaining solid. The disinfectant transfer pipe is connected to the disinfectant transfer pipe, and the disinfectant injection device for adding the solid bromine-based disinfectant transferred through the pipe to the water to be disinfected can be configured. Furthermore, the apparatus can be configured so that the disinfectant completely dissolves from the addition position until it reaches the discharge location of the water to be treated. Furthermore, a preparative line for collecting a sample of the water to be treated, a disinfectant supply means for adding a disinfectant to the sampled water sample to be treated, and a sample of the water to be treated to which the disinfectant has been added. An effective halogen concentration measuring device for measuring the effective halogen concentration, and the addition of a disinfectant according to the degree of decrease in the effective halogen concentration in the treated water sample after addition of the disinfectant measured by the effective halogen concentration measuring device. The sewage treatment apparatus can be configured to include disinfectant addition amount control means for controlling the addition amount of the disinfectant added to the water to be treated by the mixing device. Also, a reducing agent supply device that adds a reducing agent to the treated water after adding the disinfectant, and an effective halogen concentration measuring device that measures the effective halogen concentration in the treated water after adding the disinfectant are measured. Further, a reducing agent addition amount control device for controlling the addition amount of the reducing agent according to the effective halogen concentration in the water to be treated after the addition of the disinfectant can be further provided.

Another aspect of the present invention is a method for disinfecting sewage,
Inflow sewage is sterilized by chlorine or UV when the inflow sewage amount is below a predetermined value, and when the inflow sewage amount is greater than or equal to a predetermined value, the sewage amount at a predetermined value is chlorine or UV. The present invention relates to a sewage treatment method characterized by disinfecting and simultaneously disinfecting a sewage amount obtained by removing a predetermined amount of sewage amount from an inflow sewage amount with a bromine-based disinfectant.

  In such a method, the number of coliforms in the sewage is preferably 3000 or less per 1 cc of sewage by disinfection with chlorine or UV. Further, the number of E. coli in sewage can be reduced to 200 or less per 100 cc of sewage by disinfection with chlorine or UV. Furthermore, the sewage from the combined sewer can be treated as sewage to be treated by the above method. In the above method, the number of coliforms in sewage can be reduced to 3000 or less per 1 cc of sewage by disinfection with a bromine-based disinfectant. In addition, disinfection with a bromine-based disinfectant can reduce the number of E. coli in sewage to 200 or less per 100 cc of sewage. Furthermore, sewage sterilized by chlorine or UV and / or sewage sterilized by bromine-based disinfectants can be run into public water bodies. Also, the time for disinfection treatment with bromine-based disinfectant can be within 3 minutes. Further, as a bromine-based disinfectant, a solid bromine-based disinfectant can be added to and mixed with the water to be treated for disinfection. In addition, as a bromine-based disinfectant, a solid bromine-based disinfectant is mixed and dissolved in a part of the water to be treated to prepare disinfecting water, and the prepared disinfecting water is poured into the water to be treated. It can be carried out. Further, the disinfectant can be completely dissolved from the addition position until it reaches the discharge point of the water to be treated. Further, in the above method, a part of the water to be treated was sampled and a bromine-based disinfectant was added, and the effective halogen concentration of the sample to be treated to which the bromine-based disinfectant was added was measured and measured. The method may further include controlling the amount of the bromine-based disinfectant added to the water to be treated according to the degree of decrease in the effective halogen concentration in the water to be treated after the addition of the bromine-based disinfectant. Further, in the above method, the effective halogen concentration in the treated water after adding the bromine-based disinfectant is measured, and the bromine-based disinfecting is performed according to the measured effective halogen concentration in the treated water after the disinfectant is added. A reducing agent can be added to the water to be treated after the agent is added.

In the following, various forms of bromine disinfection devices that can be used in the present invention, disinfection control methods using the bromine disinfection devices, and the like will be described in detail. As described above, in the following description, the water to be treated, which is guided to the outlet 2 by the branching device according to the present invention and is sterilized with the bromine-based disinfectant, is sometimes referred to as sewer stormwater overflow, This description is not intended to limit the invention. In the following description, the bromine disinfection device may be simply referred to as a disinfection device for convenience.
Disinfection of sewage such as sewage and drainage is usually performed using ultraviolet irradiation, ozone sterilization, and a chlorine-based disinfectant such as sodium hypochlorite. In particular, chlorine-based disinfectants have many advantages, such as simple equipment and high applicability to soil conditions, compared to ultraviolet irradiation and ozone sterilization.

  However, if the technology applied to normal sewage treatment is diverted to the treatment of sewer stormwater overflow, the following problems arise. First, since ammonia and amine coexist in sewer stormwater overflow, a chemical reaction represented by the following formula (1) occurs, active chlorine changes to chloramine, and the bactericidal effect decreases to 1/10 or less. . Therefore, even if the number of pathogenic bacteria does not change, if ammonia or amine is present, it is necessary to increase the addition amount of the chlorine-based disinfectant.

Formula 1

NH ₄ ⁺ + HClO → NH ₂ Cl + H ₂ O + H ⁺ (1)
In addition, the disinfection time when using a chlorine-based disinfectant is 15 minutes or more (see "Sewerage Facility Planning / Design Guidelines and Explanations"), so mix the sewer overflow water with the chlorine-based disinfectant in the rain, 15 minutes A mixing tank for retaining the above is required. However, the facility for draining sewer stormwater overflow does not have enough space to install such a mixing tank.

  Therefore, a disinfectant having a short disinfection time and a mixing method thereof are required for the disinfection treatment of sewer stormwater overflow.

  One of the features of the present invention is that a solid bromine-based disinfectant is used for disinfecting sewer stormwater overflow. Examples of the solid bromine-based disinfectant that can be used in the present invention include 1-bromo-3-chloro-5,5-dimethylhydantoin (BCDMH), 1,3-dibromo-5,5-dimethylhydantoin (DBDMH). And so on.

  In one aspect of the present invention, an apparatus for storing a solid bromine-based disinfectant, a disinfecting water preparation apparatus for obtaining disinfecting water by mixing the solid disinfectant with water, the disinfecting water, an organic substance, ammonia or ammonium ions And a disinfecting water adding device for disinfecting and adding to the sewer stormwater overflow including the above.

  In the present invention, the total organic carbon in the sewer stormwater overflow is preferably 5 mg / L or more. The ammonium ion concentration in the sewer stormwater overflow is preferably 1 mg / L or more.

  The concentration of the disinfectant in the disinfecting water is preferably 100 mg / L as Cl to 10 g / L as Cl in terms of active chlorine concentration.

  The addition concentration of the disinfectant in the sewer stormwater overflow is preferably 0.5 mg / L as Cl to 25 mg / L as Cl in terms of active chlorine concentration.

  The adding step preferably includes a step of introducing the disinfecting water under the surface of the sewer stormwater overflow. Furthermore, it is preferable to further include a step of discharging the sterilized sewer stormwater overflow into the public water area.

In another aspect of the present invention, an apparatus for producing disinfecting water from a disinfectant and a part of sewer stormwater overflow,
A sand basin for removing sand in sewer stormwater overflow,
A first flow path for introducing the disinfecting water into the sand basin;
There is provided an apparatus for disinfecting sewer stormwater overflow, wherein the sewer stormwater overflow is disinfected while staying in the sand basin.

  In the present invention, the disinfecting water production apparatus includes a disinfectant storage device, an apparatus for adding the disinfectant to the sewer stormwater overflow, and an apparatus for mixing the disinfectant and the sewer stormwater overflow. It is preferable to have. Moreover, it is preferable that the said sand settling basin has two or more sand settling parts, and the said 1st flow path has a distribution tank for introduce | transducing disinfection water into each sand settling part.

  The first flow path is preferably connected to an addition device for introducing the disinfecting water below the surface of the sewer stormwater overflow.

  It is preferable to further include a reservoir or discharge channel for storing the sterilized sewer stormwater overflow so that it can be discharged into the public water area.

  It is preferable that a measuring instrument for inspecting the quality of the sterilized sewer stormwater overflow is provided in the reservoir or the discharge channel.

  It is preferable to further have a second flow path for introducing part of the sewer stormwater overflow in the sand basin into the disinfecting water production apparatus.

  In the present invention, sewer stormwater overflow containing organic matter and ammonia or ammonium ions is disinfected.

  For example, in a combined sewer, sewage such as sewage or drainage and rainwater mix and flow through a sewer pipe. And the sewage which mixed both in this way, especially the sewer stormwater overflow discharged without being processed in a sewage treatment plant is disinfected by this invention.

  In the sewer type sewer, the sewer (raw water pipe) of raw sewage is separated from the sewer (rain pipe) of rainwater, and the sewer stormwater overflow flowing through the rainwater pipe and discharged into public water areas is Disinfected by the invention.

  As for the content of organic matter in sewer stormwater overflow, for example, the total organic carbon in this sewer stormwater overflow may be 5 mg / L or more, and 10 mg / L or more. It may be 30 mg / L or more, or 50 mg / L or more. Whether combined sewage or split sewage, generally, the total organic carbon is 5 mg / L or more.

The ammonium ion concentration of sewer stormwater overflow to be treated may be 1 mg / L or more, or 10 mg / L or more. When ammonium ions are contained in sewer stormwater overflow, active bromine changes to bromamine (NH ₂ Br, NHBr _2, etc.). However, in the case of bromamine, it can be effectively disinfected because it maintains the same disinfecting effect as hypobromite. In combined sewage, the ammonia ion concentration is generally 1 mg / L or more. In the case of diversion sewage, in the overflow water called first flush immediately after rainfall, the ammonia ion concentration is often 1 mg / L or more.

  In one aspect of the present invention, sewage diluted with rainwater is mainly targeted, but rainwater by a shunt sewer may be targeted. Furthermore, water containing organic matter and ammonia or amine, such as sewage, human waste, industrial wastewater, or treated water thereof, may be treated by the method of the present invention.

  In one aspect of the present invention, the water to be treated contains E. coli. This is because it is particularly necessary to disinfect such water. The combined sewage generally contains E. coli. Also, diversion rainwater often contains E. coli.

  In the present invention, a solid bromine-based disinfectant is used. Compared with chlorine-based disinfectants, bromine-based disinfectants are characterized by a shorter disinfection time. With a bromine-based disinfectant, disinfection can be performed in several tens of seconds to several minutes, for example, 30 seconds to 15 minutes, preferably 40 seconds to 10 minutes, more preferably 45 seconds to 5 minutes, and even more preferably 50 seconds to 3 minutes. Moreover, since hypobromite (HOBr) is easily decomposed naturally, it is not necessary to provide an apparatus for decomposing the hypobromite remaining in the waste water. On the other hand, with chlorine-based disinfectants, active chlorine reacts with ammonia in sewage to form chloramine and reduce sterilizing power, so disinfect within the residence time of drainage facilities in sewer stormwater overflow. It is difficult. Moreover, since the persistence of chloramine is high, it is necessary to provide an apparatus for the decomposition treatment.

  Examples of the solid bromine-based disinfectant preferably used in the present invention include 1-bromo-3-chloro-5,5-dimethylhydantoin (BCDMH), 1,3-dibromo-5,5-dimethylhydantoin (DBDMH) and the like. Can be mentioned.

  One aspect of the present invention includes a step of mixing a predetermined disinfectant with water. In the present invention, a disinfectant may be added to sewer stormwater overflow at a facility for draining sewer stormwater overflow. Examples of drainage facilities for sewer overflow in rainy weather include, for example, a rainwater discharge room for a combined sewer, a pumping station (drainage station), a pumping station for a sewerage sewerage (drainage station), a pumping pump station for a sewage treatment plant, and a sewage treatment plant A facility that branches from the flow path from the first sedimentation basin to the aeration tank and discharges sewer stormwater overflow into public waters. The disinfectant of the present invention may be added at a sewer pipe that flows into these sewer overflow drainage facilities during rainy weather, may be added at a rainwater drain pump well, or may be added within a rainwater drain pump inflow pipe. May be. In many cases, these sewer stormwater overflow drainage facilities have sand basins. In that case, you may add a disinfectant in a sedimentation basin or the inflow part of a sedimentation basin. The addition place of the disinfectant is not limited to the above-mentioned one place, and can be added in several places.

  Alternatively, a drainage facility for sewer stormwater overflow may be provided with a main channel through which sewer stormwater overflow flows and a bypass channel branched from the main channel, and a disinfection tank may be installed in the bypass channel. In this disinfecting tank, a disinfectant may be added to the sewer stormwater overflow, and the disinfectant may be dissolved in the sewer stormwater overflow.

  If the place where the disinfectant is added is the inflow side of the rainwater draining pump, it is preferable because the disinfectant and the sewer stormwater overflow are sufficiently mixed by the stirring force in the pump. Further, it is preferable to add a disinfectant at the inflow portion of the sand basin because the residence time in the sand basin can be used for the reaction time.

  Since the disinfectant used in the present invention is solid at room temperature, the disinfectant can be dissolved in water to make disinfectant water, and can be added to sewer stormwater overflow. The dissolution method is not particularly limited, and any of a water flow stirring by an ejector, a flow path stirring, and a dissolution tank provided with a mixing device may be used.

  For example, disinfecting water in which 1% by weight or more, preferably 10% by weight or more, more preferably 20% by weight or more of the disinfectant is dissolved with respect to the saturated dissolution concentration of the disinfectant may be used. However, it is not necessary to dissolve all of the added disinfectant in water, and a solid disinfectant may remain in the disinfecting water.

  The concentration of the disinfecting water is preferably 100 mg / L as Cl to 10 g / L as Cl, more preferably 200 mg / L as Cl to 2 g / L as Cl in terms of active chlorine concentration. If the concentration of disinfecting water is less than 100 mg / L as Cl, not only will the amount of disinfecting water be increased, but also the disinfectant may be consumed by diluting water, so sterilization may not be sufficient. is there. On the other hand, when the concentration of the disinfecting water is larger than 10 g / L as Cl, mixing of the disinfectant and the sewer stormwater overflow becomes insufficient, and the disinfecting effect is reduced.

  The amount of disinfecting water depends on the concentration of the disinfectant in the disinfecting water, the amount of rainfall, the quality of the sewer stormwater overflow, etc., and generally corresponds to the increase in rainfall, that is, the amount of sewer stormwater overflow and water quality. As a result, the amount of disinfecting water added increases. However, in one embodiment of the present invention, the increase in rainwater reduces the pollution of incoming water quality. Therefore, in one embodiment of the present invention, even if rainwater increases and the inflow water amount triples, it is not necessary to triple the amount of disinfecting water or disinfectant added. Therefore, it is reasonable to find the optimum addition amount in the influent water quality by a beaker test or the like in advance and determine the addition amount of the disinfecting water or the disinfectant by multiplying the value by the inflow water amount.

  Regarding inflow water quality, it is possible to grasp the mixed state of rainwater by measuring turbidity or electrical conductivity. With this index, on-time detection is possible. In addition to these indicators, rainfall patterns, particulate properties in sewer stormwater overflow, SS content, chemical oxygen demand (COD), biological oxygen demand (BOD), biological oxygen demand (BOD) Etc., and these indices may be arbitrarily combined. In addition, various flow meters may be used for the inflow water amount, but it may be determined from the number of operating rainwater pumps and the load status.

  Next, the disinfecting water is added to a predetermined sewer stormwater overflow to disinfect. For example, the disinfecting water in the disinfecting water tank is introduced into the main channel via the bypass channel.

  When the sewer stormwater overflow is sewage mixed with rainwater, manure, industrial wastewater, etc., the concentration of the disinfectant in the sewer stormwater overflow is usually 0 in terms of active chlorine concentration. It is preferably 5 to 25 mg / L as Cl, more preferably 1 to 15 mg / L as Cl. The added concentration of the disinfectant can be calculated from the concentration and amount of the disinfectant in the disinfecting water and the amount of sewer overflow water in rainy weather. The added concentration of the disinfectant is a value before the disinfectant is consumed in the sewer stormwater overflow.

When treated water is sewage mixed with rainwater, urine, industrial wastewater, etc., these treated waters generally contain coliforms in the range of 10 ⁴ to 10 ⁷ CFU / mL. By the above-mentioned addition amount, the water to be treated can be sterilized quickly and reliably usually in about 1 minute.

    FIG. 9 is a schematic explanatory diagram illustrating an embodiment of the present invention.

  Sewer stormwater overflow flows from the main sewer pipe into the discharge channel 12. The sewer stormwater overflow in the channel 12 moves over the discharge gate 11 to the discharge water channel 17 and is discharged into the public water area 19. The sewer stormwater overflow in the discharge channel 17 is measured by a measuring device 18 such as a residual halogen detector, a turbidimeter, and an electric conductivity meter. The residual halogen detector measures the residual concentration of active halogen such as hypobromous acid. Thus, the residual halogen detector is preferably arranged between the discharge gate and the front of the discharge port.

When the active halogen concentration detected by the residual halogen detector is LC ₅₀ value (for example, in the case of BCDMH, 0.4 mg / L in terms of active chlorine (Cl ₂ )) or more, the LC ₅₀ value or less is obtained. Thus, desirably, when the LC ₅₀ value is ½ (for example, in the case of BCDMH, 0.2 mg / L in terms of active chlorine (Cl ₂ )) or more, the LC ₅₀ value is ½ or less. Reduce the supply of disinfectant or disinfecting water or temporarily shut off. As a result, adverse effects on aquatic organisms in public waters can be reduced.

  Then, after confirming that these measured values and the number of coliform bacteria satisfy a predetermined release standard, the result is discharged into a public water area 19 such as a river.

  Public water includes rivers, lakes, harbors, coastal waters, public trenches, irrigation canals, and other public waters or canals.

  In the embodiment of FIG. 9, a bypass channel 20 is connected to the channel 12. A part of the sewer stormwater overflow that has flowed into the channel 12 is introduced into the bypass channel 20. Then, a bromine-based disinfectant is added to the sewer stormwater overflow, converted into disinfecting water, and returned to the flow path 12 again.

  A pumping pump 13 is disposed in the flow path 12. A part of the sewer stormwater overflow in the channel 12 is pumped to the bypass channel 20 by the pump 13.

  In the bypass channel 20, an automatic screen 22, a flow meter 23, a disinfectant addition device 30, a dissolution device 40, and a pump 46 are arranged in this order.

  The disinfectant addition device 30 includes a hopper 32 for storing the solid bromine-based disinfectant 39, a feeder 34 for supplying the solid bromine-based disinfectant 39, and an ejector for discharging the disinfectant to the bypass channel. 36.

  The sewer stormwater overflow in the bypass channel 20 to which the solid bromine-based disinfectant is added is guided to the dissolving device 40. The dissolution apparatus 40 dissolves a solid bromine-based disinfectant in sewage during rainy weather. When the disinfectant is liquid, the disinfectant is mixed with sewage in rainy weather. The apparatus 40 has a dissolution tank divided into a stirring tank 41a and a storage tank 41b. However, it is not necessary to divide the dissolution tank into two tanks in this way.

  The stirring tank 41a is provided with a water level gauge 42 and a stirrer 44 for stirring the waste water. The sewer stormwater overflow in the agitation tank 41a is agitated by the agitator 44, and the disinfectant can be formed by dissolving the solid disinfectant in the sewer stormwater overflow. The disinfecting water overflowed in the storage tank 41a is transferred to the storage tank 41b.

  When the solubility of the solid disinfectant is small, it is preferable to provide a dissolving device 40. On the other hand, when the solubility of the solid disinfectant is high, the disinfectant is quickly dissolved in the flow path, and thus a dissolution apparatus is not necessarily required.

  The disinfecting water obtained by the apparatus 40 is preferably guided by the pump 46 to the flow path 12 of the sewer stormwater overflow through the flow path 47.

  In addition, a reservoir portion is formed in the flow channel 12 or the discharge flow channel 17 of the sewer stormwater overflow, or a stirrer or baffle plate is arranged to promote mixing of the disinfecting water and the sewer stormwater overflow. Can do.

  Moreover, when a sand basin is arranged in the facility for draining sewer stormwater overflow, disinfecting water may be introduced into the inflow part of the sand basin or the sand sink part of the sand basin. FIG. 10 shows a general sand basin configuration. The sand settling basin 10 is divided into an inflow portion 11 and sand settling portions 14a, b, and c.

  A pumping pump 13 is disposed in the inflow portion 11 of the sand basin 10. A part of the sewer stormwater overflow introduced from the flow channel 12 of the sewer stormwater overflow into the inflow portion 11 of the sand basin is pumped to the bypass flow channel 20 by the pump 13. On the other hand, the other part of the sewer stormwater overflow in the inflow part 11 flows into the sand settling parts 14a, 14b, 14c.

  A part of the sewer stormwater overflow introduced into the bypass channel 20 is dissolved by the disinfectant supply device and dissolution device shown in FIG. 9 to form disinfectant water. Through the sand basin 10. The disinfecting water may be directly guided to the sand basin 10 or may be guided to the sand basin 10 via the distribution tank 48 as shown in FIG.

  That is, in FIG. 11, the distribution tank 48 is provided in the flow path 47. In FIG. 11, for convenience of explanation, the sand settling portions 14a, 14b, and 14c of the sand settling basin 10 are illustrated, and the inflow portion 11 is omitted.

  The disinfecting water may be guided to the inflow portion 11 of the sand basin 10 or may be introduced upstream of each of the sand settling portions 14a, 14b, and 14c of the sand basin 10 as shown in FIG.

  As shown in FIG. 11, when disinfecting water is introduced upstream of each of the sand settling portions 14 a, 14 b, 14 c of the sand basin 10, the disinfecting water is supplied to the sand settling portions 14 a, 14 b, 14 c in the distribution tank 48. It is preferable to preliminarily distribute the disinfecting water led to each of the above.

  In the sand settling portions 14a, 14b, and 14c, sand contained in the sewer stormwater overflow is settled and removed. At the same time, sewer stormwater overflow and disinfecting water are mixed to disinfect the sewer stormwater overflow. The sterilized sewer stormwater overflow is guided to the discharge water channel 17 by the pump 16 and discharged to the public water area 19. In the sand settling portions 14a, 14b, and 14c, the sewer stormwater overflow and the disinfecting water are preferably retained for 1 second to 30 minutes, more preferably 1 second to 15 minutes, and still more preferably 1 second to Stay for 10 minutes.

  FIG. 12 shows an embodiment of an adding device for adding disinfecting water to sewer overflow water in rainy weather. The addition device 50 has a pipe 52 extending in the horizontal direction and an introduction section that communicates with the pipe 52 and introduces disinfecting water into sewer stormwater overflow. The pipe 52 communicates with the disinfecting water supply flow path and is supported by a support (not shown). One embodiment of the introduction part is, for example, a plurality of hoses 54 suspended from the pipe 52. The open end 56 of the hose is preferably located below the surface of the sewer stormwater overflow. The disinfecting water distributed from the distribution tank 48 flows through the disinfecting water supply channel, the pipe 52 and the hose 54 in this order, and is added to the sewer stormwater overflow 15.

  When the open end 56 of the hose 54 is located on the surface of the sewer stormwater overflow 15 during rainy weather, the disinfecting water splashes from the open end 56 of the hose form mist and corrode surrounding equipment, particularly electrical equipment. There is a risk of causing it. The open end 56 of the hose is preferably disposed below the surface of the sewer stormwater overflow 15 in rainy weather.

  The tube 52 is preferably made of a material that is not corroded by disinfecting water. For example, a metal material such as Inconel, or a plastic material such as polytetrafluoroethylene or polyvinyl chloride can be used. The tube 52 preferably has sufficient mechanical strength to support the hose. It is preferably rigid, but may be flexible.

  For example, 2 to 20 hoses, preferably 2 to 10 hoses, and more preferably 2 to 6 hoses may be hung on each pipe 52. The distance between two adjacent hoses is preferably constant. This is because disinfecting water can be efficiently mixed with waste water. But the space | interval between two adjacent hoses may differ. The hose 54 is preferably flexible, but may be rigid.

  In addition, although the example which branched a part of sewer overflow water at the time of rain and used as water for disinfectant dissolution was shown above, tap water, miscellaneous water, etc. can also be used as water for disinfectant dissolution.

  FIG. 13 shows another embodiment that can be adopted as a disinfectant storage / supply device in the present invention. The solid bromine-based disinfectant storage / supply tank 100 is divided into a cylindrical storage unit 101 and a supply unit 102, for example, a cylindrical type. A stirring device such as a stirring blade for stirring the solid disinfectant in the tank is provided at the bottom of the storage unit 101, and is connected to the motor 104 to rotate. In addition, air is supplied to the storage unit 101 from the air source facility 105. A predetermined amount of solid disinfectant is discharged from the supply unit 102, passes through the guide tube 107, and falls onto the dissolution cone 108 of the chemical dissolution unit 109.

According to the disinfectant storage device shown in FIG. 13, the shape of the storage part is cylindrical, for example, cylindrical, and powder compaction and bridge formation are prevented by mechanical stirring by a stirring blade and stirring by air. ing. If the storage part is an inverted cone type as in a conventional hopper, a bridge is formed by the solid disinfectant, which tends to cause a supply failure. In particular, the present invention aims to disinfect sewer stormwater overflow during heavy rain, so a solid bromine-based disinfectant is stored for a long period of time, and a large number of dozens to dozens of times a year When it rains, it must be added to the sewer stormwater overflow and sterilized immediately. In addition, such a disinfectant addition device is installed in, for example, a sewer storm water discharge chamber or a pumping station and is operated by remote operation in an unattended state, so that storage and supply can be performed without forming a compaction or a bridge for a long period of time. It must be possible. Furthermore, solid bromine-based disinfectants have the property of causing compaction and bridging more easily than other solid powders, and the prevention of compaction and bridging provides a solid bromine-based disinfectant smoothly. It is essential for this. In the disinfectant storage device 100 shown in FIG. 13, the solid disinfectant is mechanically agitated by the agitating blade 103, and air from the air source 105 is ejected from air holes provided at a plurality of locations at the bottom of the tank 100. To stir. In addition, it is preferable to install a dehumidifier in the introduction line of air from the air source 105 so that dry air is supplied to the storage unit 101. As for the humidity of the stirring air, for example, the dew point at a pressure of 0.5 MPa is preferably 5 ° C. or less. By dehumidifying the stirring air, it is possible to prevent deterioration of the solid bromine-based disinfectant due to hydrolysis. The supply of the stirring air can be performed intermittently. The supply amount of the stirring air is preferably about 80 NL / min with respect to 1 m ³ of the reservoir. As the air source 105, it is preferable to use a device that can always secure a pressure of 0.5 MPa or more. Further, by supplying dry air continuously into the storage unit 101 to make the inside pressurized, the solid disinfectant can be smoothly discharged from the supply unit 102 without being obscure. The air in the storage unit 101 is exhausted through the dust collector 106.

  As the dust collector 106, a bag filter, a water washing tower, a cyclone, or the like can be used.

  The shape of the solid disinfectant storage unit 101 is preferably a cylindrical shape, but a conical shape or a rectangular shape can also be used if a powder flow mechanism by a stirrer or air purge is provided. Further, as a means for stirring the solid disinfectant in the storage unit, a method of vibrating the container itself can be employed in addition to the mechanical stirring and the stirring by air blow.

  A specific configuration example of the solid disinfectant storage unit 101 will be described with reference to FIG.

  Referring to FIG. 14, the solid disinfectant storage unit includes a solid disinfectant storage tank 100, and a fixed amount feeder 102 that measures a predetermined amount of powder in the storage tank 100 and discharges it to a supply destination. ing. The storage tank 100 is attached to the support frame 112, and the metering feeder 102 is attached to the lower surface of the storage tank 100.

  The storage tank 100 is demonstrated with reference to FIG.15 and FIG.16. The storage tank 100 is formed in a cylindrical container shape, and includes a bottom plate 100a in which a discharge port 124 is formed, a ceiling plate 100b in which a solid disinfectant input port 126 is provided, and a cylindrical container body 100c. A solid disinfectant is introduced into the container from the inlet 126. Further, on the bottom plate 100a, there is provided a stirring blade 130 which is a powder stirring means having a drive shaft 128 penetrating the bottom plate 100a and rotating in a predetermined direction R around an axis 115 extending in the vertical direction.

  The container main body 100c includes eight injection nozzles 132 that are compressed air injection ports that open in the vicinity of the stirring blades 130 at eight equal intervals in the circumferential direction of the peripheral edge thereof. The bottom plate 100 a is provided with injection nozzles 132 that open toward the four stirring blades 130 at equal intervals around the axis 115. Each of the injection nozzles 132 is supplied with dry compressed air from a compressed air source 162 via a check valve 164. The compressed air is supplied with its injection amount, injection interval, etc. freely controlled.

  The check valve 164 may be a well-known valve, for example, a poppet valve whose valve body moves perpendicularly to the valve seat, or a swing catch valve whose valve plate swings around the hinge with respect to the valve seat. Can do. In order to reliably stop the powder from flowing backward in the direction of the compressed air source, the valve body or the valve plate is pressed by a known means such as a spring 165 so that the valve is opened only when the compressed air is flowed. It is good to.

  The solid disinfectant inlet 126 is attached with a lid member or an openable butterfly valve that closes the opening. The ceiling plate 100b is provided with a dust collection port 100d connected to the dust collection facility. Four brackets 100e for mounting the storage tank 100 on the support frame 12 (FIG. 14) are provided on the outer periphery of the container body 100c.

  The stirring blade 130 includes a pair of radiating blades 131 and 131 extending radially in the opposite direction from the axis 115 to the inner peripheral portion of the container body 100c. Each of the radiating blades 131 has an upwardly projecting hollow triangular cross section that communicates with each other, and the distal end portion in the radial direction is bent toward the rotation direction R side and protrudes upward. Pressurized air is supplied from the compressed air source 162 to the radiating blade 131 through the check shaft 164 through the drive shaft 128 in the hollow portion thereof, and is on the ridgeline at the upper end of the triangular cross section and the surface on the rotation direction R side. A plurality of the injection ports 133 are formed.

  The fixed quantity feeder 102 will be described with reference to FIGS. 17 and 18. The metering feeder 102 has a cylindrical container body 134, a drive shaft 138 that is disposed on the bottom plate 136 of the container body 134 and passes through the bottom plate 136, and has a predetermined rotational direction RR about an axis 115 that extends in the vertical direction. And a stirring blade 142 which is a stirring means integrally provided on the rotary table 140. The quantitative feeder 102 includes a drive source 144 that rotates the drive shaft 138.

  The container body 134 has a cylindrical shape having an inner diameter substantially the same size as the discharge port 124 of the storage tank 100, a supply port 146 is formed in the bottom plate 136, and an upper end of the cylinder has a mounting flange 147. And is attached to the portion of the outlet 124 of the bottom plate 100a of the storage tank 100.

  The turntable 140 includes a plurality of measuring chambers 140a that are opened in the upper and lower directions and radially outward as measuring means in the circumferential direction of the outer periphery. The outer and lower openings of the measuring chamber 140a are substantially closed by the peripheral wall of the container body 134 and the bottom plate 136. When the rotary table 140 is rotated in a predetermined direction RR, the powder in the container body 134 is sequentially introduced from the upper opening into the weighing chamber 140a, and the upper opening is also closed at the portion of the scraping plate 140b. It is confined in the chamber 140a. At the center of the cutting plate 140b in the rotation direction RR, the lower opening is opened in the supply port 146, and the powder in the measuring chamber 140a is discharged. Therefore, by defining the volume of the measuring chamber 140a and the rotational speed of the turntable 40, a predetermined amount of powder is measured and discharged to the supply port 146.

  The cylindrical container body 134 is provided with spray nozzles 148 that are compressed air spray ports that open at three locations on the periphery of the container body 134 and in the lower part near the stirring blades 142. As with the above-described injection nozzle 132 provided in the storage tank 100, the dry compressed air from the compressed air source 162 is supplied to the injection nozzle 148 via the check valve 164 with the injection amount, the injection interval, etc. controlled. .

  The stirring blade 142 includes a pair of radiating blades 143 and 143 that extend radially in the opposite direction from the axis 115 to the inner peripheral portion of the container main body 134. Each of the radiating blades 143 has a hollow triangular cross-section that communicates upward and has a radially leading end protruding upward. Pressurized air from the compressed air source 162 is supplied to the radiating blade 143 through the check shaft 164 through the drive shaft 138 into the hollow portion thereof, and the surface on the ridge line at the upper end of the triangular cross section and the rotation direction RR side. A plurality of the injection ports 150 are formed.

  A pipe member 107 is connected to the supply port 146 of the fixed amount feeder 102. The solid disinfectant supplied from the metering feeder 102 falls to a dissolution cone 108 that is disposed below the pipe member 107 and is a dissolution means for dissolving the discharged powder in water. Dissolved water from the dissolving cone 108 flows into the ejector 109 of the pipe line 20 to which the flowing water is pumped, sucked by the suction action of the ejector 109, and sent to the target location through the transport pipe line 47.

  In the melting cone 108, water is discharged from a plurality of nozzles at the periphery of the upper end portion of the funnel-shaped main body that expands upward, and the discharged water is swirled along the inner surface of the funnel-shaped main body and flows downward. . The powder is melted by introducing the powder from the tube member 107 into this flow. However, it is not necessary to dissolve all of the powder in water, and a solid disinfectant may remain in the disinfecting water.

  According to the solid disinfectant storage / supply apparatus having the above-described configuration, a dissolution cone is provided between the drug supply unit and the drug dissolution unit, and the drug cut out by the supply unit falls to the dissolution cone. With this structure, the chemical dissolution part and the supply part can be separated, and the disinfecting water can be prevented from flowing back to the solid drug storage part.

  As the chemical supply unit, in addition to the table feeder type described above, a screw feeder type or rotary valve type supply device can be adopted. In addition to the combined use of the vortex-type melting cone and ejector described above, the chemical dissolving section includes a circular or square slide water supply system, a combination of a simple tank and a stirrer, a line mixer, etc. A form can be adopted.

  In addition, a solid disinfectant container can be connected to the disinfectant inlet 126 of the storage unit 101. According to FIG. 19, the solid disinfectant storage tank 101 has a container 186 (one in the figure) which is a plurality of containers having openable and closable discharge ports 184 in which a solid disinfectant is accommodated. Are connected via the discharge port 184 (state of FIG. 19).

  The container 186 will be described with reference to FIG. The container 186 includes a container main body 114 having a discharge port 184 formed at the lower end, a cone 116 that is provided in the discharge port 184 and normally closes the discharge port 184, and one end connected to the cone 116. 114 and a cone rod 118 that is a shaft member that extends upward in the interior and projects the other end outward. The discharge port 184 is opened and closed by gripping the protruding end of the cone rod 118 and operating the cone 116. The cone rod 118 is biased in a direction to close the discharge port 184 by a biasing means 120 having a spring disposed in the container main body 114.

  The container main body 114 includes a cylindrical vertical main body 114a, a top lid 114c having a powder inlet 114b, a funnel-shaped bottom 114d in which a cone 116 abuts and a discharge port 184 is formed, and a bottom 114d. A cylindrical guide portion 114e formed at the tip end portion and detachably connected to the storage tank 101 is provided. A frame 14f for storage, movement, placement on the storage tank 101, and the like is provided on the lower outer periphery of the main body 114a.

  The cone 116 has a hollow cone shape, and a cone seal 117 that is a seal material that comes into contact with the discharge port 184 is attached to the outer peripheral edge of the bottom surface of the cone 116, and the top portion is connected to the cone rod 118.

  The cone rod 118 is guided to be slidable up and down by a shaft guide 114g attached to the upper lid portion 114c. The urging means 120 includes a compression coil spring 121 between the shaft guide 114 g and the pin 119 of the cone rod 118. A cone rod 118 is passed through the compression coil spring 121. A disc-shaped flange portion 122 that is releasably gripped by a valve opening / closing means (the valve opening / closing means will be described later) is provided at the protruding upper end of the cone rod 118.

  With reference to FIG. 21, an example of the installation form of the solid disinfectant supply equipment configured as described above will be described. Near the solid disinfectant storage tank 101 and the metering feeder 102, there are a plurality of containers 186 containing solid disinfectants at intervals, and a plurality of three-stage shelves 156 in a direction perpendicular to the paper surface of FIG. Column, stored. A stacker crane 158 is provided between the storage tank 101 and the quantitative feeder 102 and the shelf 156. The container 186 of the shelf 156 is appropriately taken in and out as necessary by the stacker crane 158, and the removed container 186 is stored in the storage tank. On 101, the guide part 114e of the discharge port 184 is inserted and placed in the storage port 126 of the storage tank.

  A valve opening / closing means 160 is provided above the placed container 186. The valve opening / closing means 160 includes a pneumatic cylinder that is opened and closed horizontally by a pneumatic cylinder and detachably grips the flange 122 of the cone rod 118 of the container 186 and moves in the vertical direction. The cone 116 which is a valve body is opened and closed.

  With reference to FIG. 22, an embodiment using a flexible container bag 180 which is another form of a container containing a solid disinfectant will be described. The flexible container bag 180 is a well-known bag that is formed of a flexible bag and is used to store powder or the like. The flexible container bag 180 includes a discharge port 180a that can be freely opened and closed by a tape, a rope, or the like at the bottom of the bag, and a rope 180b for suspension at the top. The flexible container bag 180 containing the powder is suspended and moved by the hanging metal fitting 182 using the electric chain block 184 in the storage place, and the discharge port 180a is inserted into the solid disinfectant input port 126 on the storage tank 101. Positioned. Then, the discharge port 180a is opened by unwrapping the tape, rope, etc., which are closed, and the storage tank 101 is filled with the solid disinfectant.

  The operation of the solid disinfectant supply facility as described above will be described.

(1) The required amount of solid disinfectant can be supplied when needed:
The solid disinfectant is divided into a plurality of containers, the container 186 or the flexible container bag 180, and the containers are sequentially connected to the storage tank 101 according to the required amount of the supply destination, and the storage tank 101 is filled with powder, Since a predetermined amount of the filled powder is measured and supplied to the supply destination by the quantitative feeder 102, the amount of the powder stored in the container and the storage tank can be reduced, and solidification of the powder due to compaction can be prevented. In addition, the storage unit 101 includes the stirring unit 130 and the fixed amount supply unit 102, and the compressed air is periodically injected into the storage tank 101 and / or the fixed amount supply unit 102 from the peripheral wall and the stirring unit. Further, solidification of the powder can be further prevented. Therefore, a necessary amount of powder can be supplied when necessary.

(2) The powder does not touch workers etc .:
Since the container 186 or the flexible container bag 180, which is a container containing the solid disinfectant, is placed on the storage tank 101 with its discharge port connected via the input port 126, and the solid disinfectant is filled in the storage tank 101, It is unnecessary to open the bag in which the body is sealed and fill the storage tank 101 with the powder, and the operator can be prevented from touching the powder.

(3) Check valve:
Since the compressed air is injected into the storage tank 101 and the quantitative supply machine 102 via the check valve 164, the storage tank 101 and the quantitative supply apparatus 102 can be maintained in a pressurized state, and the powder from the supply port 146 can be maintained. Can be discharged more smoothly.

(4) Flexible pipe member connected to the quantitative feeder:
By forming the pipe member 107 connected to the powder supply port 146 of the fixed quantity feeder 102 with a synthetic resin such as flexible vinyl chloride, the weighing chamber 140a of the rotary table 140 in the pressurized constant quantity feeder 102 is formed. When the rotary table 140 is intermittently communicated with the solid disinfectant supply port 146, the solid disinfectant in a pressurized state is intermittently discharged to the tube member 107, and the tube member 107 expands and contracts due to its action. Therefore, the solid disinfectant is prevented from being blocked in the tube member 107. It is also unnecessary to give a hit from the outside for preventing the blockage performed when a steel pipe or the like is used as the pipe member 107. If the tube member 107 is made transparent, the state of the powder therein can be confirmed, which is convenient.

(5) Dissolution means:
Furthermore, if the solid disinfectant measured and discharged by the quantitative feeder 102 is transported as dissolved water through the dissolution cone 108 which is a dissolution means, the powder is simply put into the transport line that is pumped with running water. Compared with sending to a supplier, it can be sent efficiently and effectively.

  Further, the apparatus described above can be variously modified or modified within the scope of the present invention as described below.

(1) Installation position of quantitative feeder:
In this embodiment, the fixed amount feeder 102 is attached outside the storage tank 101. However, the constant amount feeder 102 is disposed in the storage tank 101 so as to be driven on the same axis 115 as the stirring means 130, for example. May be.

(2) Check valve installation position:
In the present embodiment, the compressed air from the compressed air source 162 is supplied to the storage tank 101 and the plurality of injection nozzles 132 and 148 and the injection ports 133 and 150 of the metering feeder 102 via the common check valve 164. However, depending on the size, shape, type of solid disinfectant to be handled, supply interval of compressed air, etc. In order to prevent clogging of the solid disinfectant, a check valve may be provided in each of the injection nozzle and / or the injection nozzle part.

  FIG. 23 shows another configuration example of the dissolving unit that forms the disinfecting water by dissolving the solid disinfectant in water. The solid disinfectant storage tank 101 described with reference to FIG. 13 and the like is installed on a pit 210 provided in the flow path 12 of sewer stormwater overflow. A disinfectant guide tube 107 connected to the metering feeder 102 is disposed toward the pit 210. An underwater ejector 201 to which an underwater mixer 202 is attached is installed in the flow path 12. A part of the sewer stormwater overflow in the flow path 12 is pumped by the pump 203, and after removing impurities by the strainer 205, it is supplied to the underwater mixer 202 and the underwater ejector 201 through the pipes 207 and 208. A solid disinfectant that falls from the upper disinfectant guide tube 107 is introduced into the underwater mixer 202, and is sufficiently mixed in water in the underwater ejector 201 to form disinfecting water. It is poured into water, that is, sewer stormwater overflow. FIG. 23b is a view of the AA line in FIG. 23a as viewed from above. In this way, the discharge port 204 can also be branched.

  With such a configuration, the height of the apparatus can be reduced. In the conventional solid disinfectant storage / supply device, since the mixer is disposed below the supply device, the height of the device inevitably increases. By setting it as said structure, since a mixer is arrange | positioned in a sewer flow path, the height of an apparatus becomes low. Actually, the conventional solid disinfectant storage / supply device has a height of about 5.5 m, but in the configuration shown in FIG. 23, the height of the device can be about 2 to 3 m. By reducing the height of the device, there are no restrictions when installing the device. Thus, since the installation height of the solid disinfectant storage tank can be lowered, the power can be reduced when the solid disinfectant is replenished to the storage tank by a line. Moreover, since the feed water head to a mixer becomes small, the motive power for water supply can be made small. Furthermore, in the conventional solid disinfectant storage / supply device, the disinfectant mixer and disinfecting water input device are arranged above the sewer stormwater overflow channel, so that disinfecting water overflows from the mixer. In this case, the disinfecting water is scattered around. However, in the configuration shown in FIG. 23, the disinfectant mixer is placed in the sewer stormwater overflow. Even if disinfecting water overflows from the machine, it will only enter the sewer stormwater overflow, and will not contaminate the surroundings.

  FIG. 24 shows another type of solid bromine-based disinfectant storage / supply device that can be used in the present invention. The solid bromine-based disinfectant storage / supply device shown in FIG. 24 includes a storage tank 250 having a solid bromine-based disinfectant inlet 252 in the upper part and an opening (solid bromine-based disinfectant outlet) in the lower part of the storage tank 250. And a solid bromine-based disinfectant quantitative supply device 251 attached thereto. The storage tank 250 has, for example, a barrel-like shape with a wide central portion, is installed by a frame 257 so that the central shaft 260 is inclined, and is configured to rotate around the shaft 260 by a motor 253. . It is preferable to install a plurality of baffle plates 256 for stirring on the inner wall of the storage tank 250. A screw feeder 255 is attached to the lower opening (solid bromine-based disinfectant discharge port) of the storage tank 250, and the solid bromine-based disinfectant accommodated in the storage tank 250 is fed to the feeder 255 by the motor 254. By rotating, a predetermined amount is supplied through the guide tube 107. A solid disinfectant dissolving device such as the dissolving cone 108 shown in FIG. 13 or the underwater mixer 202 shown in FIG. 23 can be arranged below the guide tube. According to this type of storage tank, bridging can be prevented by mixing a compacted powder such as a solid bromine-based disinfectant by rotation of the storage tank. In addition, the height of the storage tank can be reduced, and there is an advantage that air for stirring the solid disinfectant is unnecessary.

  FIG. 25 is a diagram showing another form of a solid bromine-based disinfectant storage / supply device that can be used in the present invention. In the apparatus shown in FIG. 25, a fluid / powder transfer single screw pump 312 is connected to a discharge port at the bottom of the solid bromine-based disinfectant storage tank 310. By rotating the screw part of the single screw pump 312 by the motor 314, the solid bromine-based disinfectant in the storage tank 310 can be forcibly sucked and transferred in the horizontal direction. A solid bromine-based disinfectant guide tube 107 is connected to the end of the single screw pump 312. A solid disinfectant dissolving device such as the dissolving cone 108 shown in FIG. 13 or the underwater mixer 202 shown in FIG. 23 can be arranged below the guide tube. According to this method, since it is not necessary to install a solid bromine-based disinfectant dissolving device immediately below the chemical storage tank, the height of the facility can be reduced. In addition, it is not necessary to place and guide a large amount of dissolved water for dissolving the solid bromine-based disinfectant in the vicinity of the chemical supply equipment, so that the construction cost for the entire plant can be reduced and the installation conditions are eased. The As a single screw screw pump for fluid / powder transfer that can be used for this purpose, for example, a mono pump manufactured by Mono Pump Ltd. of the United Kingdom can be used. Such a device can also be used as a transfer means for replenishing a solid bromine-based disinfectant storage tank for use as a solid bromine-based disinfectant storage / supply device. Note that the solid bromine-based disinfectant storage tank 310 shown in FIG. 25 is a so-called hopper type, but a compacting / bridge prevention mechanism 311 such as a mechanical stirring device or an air purge is installed on the bottom surface. Prevents formation. Of course, for example, the storage tank shown in FIG. 13, FIG. 15, FIG.

  FIG. 26 shows another example of a solid bromine-based disinfectant storage / supply device using a single screw pump for fluid / powder transfer. The configuration of the solid bromine-based disinfectant storage tank 310 and the single screw pump 312 is the same as the configuration shown in FIG. In the system shown in FIG. 26, another single screw pump 320 is further arranged, and water for dissolving for dissolving the solid bromine-based disinfectant is introduced into the inlet 322. The water for dissolution is transferred by rotating the screw portion of the single screw pump 312 by the motor 321, and passes through the pipe 324 to the single screw pump 312 to which the solid bromine-based disinfectant is transferred from the inlet 325. be introduced. Preferably, the dissolving water and the solid bromine-based disinfectant mixed in the single screw pump 312 are then introduced into the emulsifying disperser 326, and the emulsifying disperser 326 is operated by the motor 327, so that the solid bromine-based disinfectant is operated. An agent slurry is formed and transported through the guide tube 328. The solid bromine-based disinfectant slurry transferred through the guide tube 328 can be directly put into the sewer stormwater overflow to be treated. As the emulsification disperser 326, for example, an emulsification pump having a grinder-like shape can be used. In this way, a solid bromine-based disinfectant is dispersed in a slurry form in water, and this is thrown into sewer stormwater overflow to be treated. It can be transported as a slurry to the entry point, and quickly dispersed and dissolved in the sewer stormwater overflow to be treated.

  By combining two single screw pumps in this way, for example, by making the capability of the single screw pump 312 for transferring the solid bromine-based disinfectant larger than the capability of the single screw pump 320 for water supply, The medicine in the storage tank 310 can be forcibly sucked into the single screw pump 312. Accordingly, by appropriately adjusting the capacities of the single screw pump for transferring the solid bromine-based disinfectant and the single screw pump for supplying water, the supply amount of the medicine can be finely adjusted.

  The above-described disinfection device for sewer stormwater overflow is mixed with a solid bromine-based disinfectant first, for example, a portion of sewer stormwater overflow to be treated. It is formed, and this is thrown into sewer stormwater overflow and disinfected. However, in another aspect of the present invention, the disinfecting treatment can be performed by injecting and dissolving the solid bromine-based disinfectant into the sewer stormwater overflow to be treated in the solid state.

  FIG. 27 shows a specific example of a disinfecting apparatus according to one aspect of the present invention in which a solid bromine-based disinfectant is put into a sewer stormwater overflow to be treated in a solid state. The disinfectant storage tank 401 contains a solid bromine-based disinfectant 408 in the form of powder or granules. The disinfectant 408 is sent to the disinfectant transfer pipe 405 through the disinfectant cutting device 402 and the metering device 403 by opening the valve 404. The end of the disinfectant transfer pipe 405 is connected to a disinfectant injection device 409, where the disinfectant 408 is added to the sewer stormwater overflow 412 to be disinfected. In the disinfecting apparatus shown in FIG. 27, the disinfectant injecting apparatus 409 is provided with a stirring blade 407 connected to a motor 406. By the action of the stirring blade 407, a powdery or granular solid bromine-based disinfectant 408 is provided. Is dissolved in the water to be treated.

  The disinfectant injecting device 409 preferably has a means for generating a jet of water to be sterilized, and the disinfectant injecting device is depressurized by the action of the generated jet. It is preferable that the powdery or granular solid bromine-based disinfectant is transferred by the suction force generated by the above. Some specific examples of such a structure are shown in FIGS.

  The disinfectant injection device 409 shown in FIG. 28 includes a narrow tube 424 that surrounds the shaft that connects the motor 406 and the stirring blade 407, and a cover 421 that surrounds the vicinity of the end of the thin tube 424. The end of the narrow tube 424 is disposed in the water to be treated 412, and a disinfectant transfer pipe 405 is connected to the upper portion of the narrow tube. By rotating the stirring blade 407 by the motor 406, a water flow is generated in the cover, and a jet 422 is generated in the vicinity of the end portion of the narrow tube. The inside of the thin tube 424 is decompressed by this jet flow, and the powdery or granular solid bromine-based disinfectant 423 is air-transferred toward the end of the thin tube 424 by the suction force generated thereby. The transferred disinfectant 423 is added to the water stream 422 and mixed with the water to be disinfected by the stirring blade 407.

  Further, in the disinfectant injection device 409 shown in FIG. 29, a plate-like member 431 that forms an orifice is disposed in a flow path for flowing sewer stormwater overflow. A disinfectant transfer pipe 405 is connected near the outlet of the orifice. A jet 432 is generated by the flow of the drainage water passing through the orifice, and this jet reduces the vicinity of the end of the disinfectant transfer pipe 405, and the suction force generated thereby causes the powdery or granular disinfectant 433 to be jetted. And is mixed with waste water by the stirring action of the jet.

  Further, in the disinfectant injection device 409 shown in FIG. 30, the pump 441 is disposed in the water stream 412 in the sewer stormwater overflow, and the drainage is introduced into the pipe 443 from this, and returned to the water stream 412 again through the ejector 442. . A disinfectant transfer pipe 405 is connected to the ejector 442. A jet flow is generated by the ejector 442, and the vicinity of the end of the disinfectant transfer pipe 405 is in a reduced pressure state, and the powder or granular disinfectant is transferred toward the pipe 443 by the suction force generated thereby, and the jet stirring action Mixed with waste water. As a means for reducing the pressure in the disinfectant injection device, a suction machine can be installed in the vicinity of the disinfectant injection device 409 in addition to the above-described configuration.

  Thus, the following advantages can be obtained by mixing and mixing the solid bromine-based disinfectant directly into the sewer stormwater overflow to be treated.

  First, the equipment for dissolving the necessary disinfectant by the method of dissolving or suspending the disinfectant in water in advance and then injecting it into the water to be disinfected, ie, the dissolution tank, the stirring device, the ejector, etc. is unnecessary, and the equipment cost is reduced. Lower. Furthermore, equipment for pumping disinfecting water after being dissolved or suspended in water to the injection point into the water to be disinfected, that is, a transfer pump, an ejector and the like are also unnecessary. In addition, when the slurry-like disinfectant is poured into the water to be disinfected, sufficient agitation must be continued in the dissolution tank to prevent the disinfectant from being unevenly distributed in the dissolution tank. However, this operation becomes unnecessary by putting the solid bromine-based disinfectant directly into the sewer stormwater overflow to be treated and mixing it in the solid state. Further, the disinfectant in the form of a solution or slurry does not accumulate in the pipe and clog.

  In particular, when disinfecting sewer stormwater overflow by injecting disinfectant solution, the required amount of disinfectant solution depends on the rain condition and varies greatly. In order to achieve this, it is necessary to always prepare a disinfectant that exceeds the required injection amount. However, the disinfectant once dissolved in water has a significant decrease in disinfecting activity compared to the solid state, and it is difficult to store the disinfectant in a solution state. Therefore, a solution prepared in excess of the required injection amount must be discarded, leading to an increase in operating cost and waste of resources. However, by adopting a method in which solid bromine-based disinfectant is directly injected into the sewer stormwater overflow to be treated and mixed, only the necessary amount is discharged from the storage tank when necessary. It is possible to appropriately control the injection amount of the liquid, and a disinfectant solution that is wasted when the injection is completed does not occur. Furthermore, it is possible to perform a reliable disinfection process even in facilities where it is difficult to secure water for dissolving the disinfectant in advance. Furthermore, the amount of the disinfectant injected can be easily controlled, and the risk of excessive injection or insufficient injection is reduced. Furthermore, by adopting a structure that generates a jet in the disinfectant injection device, the disinfectant transfer pipe is depressurized and the powder or granular disinfectant is transferred, causing damage in the transfer pipe. However, the disinfectant does not blow out from the damaged part.

  In the form described above, the solid bromine-based disinfectant is disinfected into the sewer stormwater overflow to be treated and mixed to dispose of the sewer stormwater overflow. In order to perform disinfection treatment by introducing a solid bromine-based disinfectant into running water, it is not always necessary to perform a mixing operation between the disinfectant and the sewer stormwater overflow to be treated at the injection point of the disinfectant.

  The first purpose of the mixing operation is to dissolve a solid disinfectant in the water to be treated. If the disinfectant remains solid, the contact efficiency between the disinfectant and the water to be treated is low, and the disinfection rate is reduced. By dissolving the disinfectant, the contact efficiency between the disinfectant and the water to be treated is improved and the disinfection speed is increased. When there is a restriction on the time until sewer overflow water is discharged into public waters in the rain, it is important to increase the disinfection speed in order to obtain a sufficient disinfection effect.

  The second purpose of the mixing operation is to disperse the disinfectant uniformly in the water to be treated. If the disinfectant is not evenly distributed throughout the water to be disinfected, the disinfectant is excessively added at locations where the disinfectant concentration is high, and the disinfectant is wasted. May be released. On the other hand, at locations where the concentration of the disinfectant is low, the addition becomes insufficient and sufficient disinfection is not performed. By uniformly diffusing the disinfectant in the water to be treated to make the disinfectant concentration uniform, it is possible to add the disinfectant without excess or deficiency.

  The third purpose of the mixing operation is to dissolve and disperse the disinfectant in the treated water, thereby reducing the residual halogen to a concentration below a certain level before the sewer stormwater overflow reaches the public water area. It is to be. If the disinfectant remains solid or the dissolved disinfectant remains in a non-uniform and high concentration and flows into public waters, it will release a high concentration of residual halogen locally, adversely affecting the destination ecosystem. May give. In order to prevent this, it is necessary for the disinfectant to completely dissolve before the sewer stormwater overflow reaches the public water area, and for the residual halogen to be reduced after dissolution. For this reason, it is important to dissolve and diffuse by mixing a disinfectant.

  By the way, the time required for the halogen-based disinfectant to disinfect by its disinfecting ability (oxidizing power) and for the oxidizing power to disappear upon completion of the oxidation reaction is sufficiently shorter than the time required for dissolution. For example, when 1-bromo-3-chloro-5,5-dimethylhydantoin (BCDMH) is used as a halogen-based disinfectant and an effective halogen concentration is about 2 mg / L as Cl, the oxidizing power of the disinfectant The disappearance of can be used as an indicator that the effective halogen concentration has been reduced to 0.5 mg / L as Cl or less. When the addition amount of the disinfectant is 10 mg / L as Cl, the time required for the disinfectant to dissolve in the water to be treated is about 1 minute, whereas the effective halogen concentration is from 0 to 2 mg / L as Cl. The time required to decrease to 5 mg / L as Cl is about 10 to 30 seconds. This time varies because it is affected by the concentration of organic substances in the water to be treated, that is, sewer stormwater overflow. Therefore, by dissolving the disinfectant little by little and securing a time of about 30 seconds after complete dissolution, both a sufficient disinfecting effect and a reduction in the residual halogen concentration of the discharged water can be achieved. .

  This is schematically shown in FIG. FIG. 31 shows the residual rate of undissolved disinfectant, the residual halogen concentration, and the time course of the coliform group when the solid disinfectant is put into the water to be treated as a solid. As the disinfectant dissolves over time, the amount of undissolved disinfectant decreases and the residual halogen concentration increases. However, the residual halogen concentration decreases due to the consumption of halogens accompanying oxidation reactions such as disinfection reactions, so the increase due to dissolution of the disinfectant offsets the decrease due to consumption due to oxidation reactions and continues to increase. There will be no abundance. And after there is no undissolved disinfectant, the residual halogen concentration decreases rapidly. During this time, the coliform group is constantly exposed to the oxidative power supplied, and thus continues to decrease until the residual halogen is depleted.

  Therefore, according to another aspect of the present invention, the solid bromine-based disinfectant is put into the sewer stormwater overflow to be treated as a solid, and the disinfectant completely reaches the public water area from the addition position. It is possible to disinfect the sewer stormwater overflow in the rain.

  The concept of the disinfection device for sewer stormwater overflow according to another aspect of the present invention based on the technical idea shown in FIG. 32 is shown. In FIG. 32, reference numeral 501 denotes a disinfectant storage device in which a solid bromine-based disinfectant 502 is stored. The solid bromine-based disinfectant is weighed by the injection amount control device 503 and transferred to the disinfectant addition position 506 provided in the flow path 505 of the sewer stormwater overflow via the disinfectant transfer pipe 504 to be disinfected. Added to the sewer overflow water 507 during rainy days. The sewer stormwater overflow to which the disinfectant is added flows down the channel 507 from the disinfectant addition position 506 to the sewer stormwater overflow outlet 508 over a certain period of time, and then the public such as a river from the outlet 508. It is discharged into the water area 509.

  In a preferred embodiment, at least 2 minutes after the disinfectant is added at the disinfectant addition position 506 and at least 1 minute after the disinfectant is completely dissolved are ensured as the time to reach the outlet 508. Is preferred. As a result, the disinfectant dissolves and diffuses in the sewer stormwater overflow by the water flow while flowing down the flow path 507. The disinfectant develops a disinfecting ability (oxidizing power) in order from the dissolved one to perform a disinfecting reaction, and the disinfecting ability (oxidizing power) is lost by the oxidation reaction. Therefore, the solid bromine-based disinfectant is dissolved in the sewer stormwater overflow by the water flow while flowing down the flow path 507, so that the disinfecting power (oxidizing power) continues to be supplied little by little for a certain time. The supplied disinfecting capacity is consumed by the sequential oxidation reaction and disappears, so that residual halogen does not remain at a high concentration at the outlet 508.

  FIG. 33 shows a form in which the shape of the flow path 507 of the sewer stormwater overflow after the addition of the disinfectant is changed. In order to secure the time from the disinfectant addition position 506 to the outlet 508, the flow path 507 is a bypass water path 507a. It is also possible to use the bypass water channel 507a as a tank of the same capacity, but in that case, in order to prevent a short-circuit flow in the tank and to bring the flow closer to the extruded flow, a partition plate in the tank Is preferably arranged. Note that the detour channel can be either a horizontal detour method or a vertical detour method.

  FIG. 34 shows another example. In this example, a dehalogenating agent adding device 510 is installed in the middle of the flow path. When the disinfectant is excessively added, the residual halogen may not be sufficiently lowered until the discharge port 508 is reached. In preparation for such a case, a reducing agent such as sodium sulfite is added from the dehalogenating agent adding apparatus 510 to neutralize residual halogen. The addition position of the reducing agent from the dehalogenating agent addition device 509 may be in the middle of the bypass water channel 507a or downstream of the bypass water channel 7a.

  FIG. 35 shows still another embodiment. In this example, the flow path of sewer stormwater overflow after addition of the disinfectant was constituted by the static mixer 507b. When it is possible to secure the time to the discharge port 508 without lengthening the flow path, the disinfection effect can be further enhanced by promoting the dissolution / mixing by the water flow by the static mixer 507b.

  FIG. 36 shows still another embodiment. For example, when adding a disinfectant to rainwater sewer stormwater overflow facilities 511 such as a rainwater spout chamber or pumping station of a combined sewer, it is sufficient to reach the outlet 508. Time may not be secured. In this case, the pouring point 514 is provided in the sewer pipe 513 upstream of the sewer stormwater overflow drainage facility 511, and the solid bromine-based disinfectant is added thereto so that the disinfectant is added to the treated water. The time to reach the discharge outlet from is secured. However, in this case, a part of the sewage to which the disinfectant is added flows into the sewage treatment plant 512. Therefore, in the case where the residual halogen concentration does not decrease until the sewage to which the disinfectant is added reaches the sewage treatment plant 512, a dehalogenating agent adding device 510 is installed on the way and a reducing agent such as sodium sulfite is added. By doing so, the residual halogen can be neutralized.

  FIG. 37 shows another configuration example of a disinfecting apparatus in which a solid bromine-based disinfectant is put into a sewer stormwater overflow to be treated in a solid state to disinfect. The disinfectant storage tank 551 stores a powdery or granular solid bromine-based disinfectant 559. The disinfectant 559 is measured by the injection device 552 to which the injection amount control device 558 is connected, and is put into the sewer stormwater overflow in the flow path 557 via the disinfectant transfer pipe 553 and is disinfected. It is discharged into the public water area from the outlet 508.

  FIG. 38 shows another configuration example. The disinfectant storage tank 551 stores a powdery or granular solid bromine-based disinfectant 559. The disinfectant 559 is measured by the injection device 552 to which the injection amount control device 558 is connected, and is sent to the disinfectant transfer pipe 553. The end of the disinfectant transfer pipe 553 is connected to the disinfectant mixing device 554, and the disinfectant 559 supplied to the disinfectant mixing device 554 passes through the sewer stormwater overflow flowing through the flow path 557 in the mixing device 554. And mixed. Also, dry air is injected into the storage tank 551 and the injection amount control device 552 from the dry air supply device 555. Thereby, the inside of the storage tank 551 and the injection amount control device 552 can always be kept in a dry state and a pressurized state. Further, in order to keep the air pressure inside the storage tank 551 and the injection amount control device 552 in a constant pressurized state, a pressure adjusting device 560 is provided between the dry air supply device 555 and the storage tank 551 and the injection amount control device 552. Can be arranged. The exhaust from the storage tank 551 and the injection amount control device 552 is discharged into the atmosphere after the disinfectant in the exhaust is removed by the dust removing device 556. It is also possible to add a reducing agent to the sterilized water discharged from the disinfectant mixing device 554 by the reducing agent addition mixing device 561 to neutralize residual halogen, and then discharge it from the outlet 508. The disinfectant mixing device 554 may be any device having a function of mixing the disinfectant with the disinfecting target water until it can be disinfected. For example, a water channel having a bypass wall, a pipe or tank, an air diffuser connected to a gas supply device, an ultrasonic generator, an agitator having a rotating blade, a reducer or a pump can be used.

  Next, a method for controlling the injection amount of the solid bromine-based disinfectant in the present invention will be described. Needless to say, the use of a halogen-based disinfectant such as a solid bromine-based disinfectant has less influence on the environment and mankind and is preferable. However, until now, from the viewpoint of safety measures, in order to achieve and maintain a sufficient disinfecting effect of pathogenic bacteria, it has been the actual situation that an excessive disinfectant exceeding the concentration of the active ingredient of the disinfectant originally necessary has been used. .

  However, it is clear that if the residual halogen concentration in the wastewater after disinfection discharged into public water areas is too high, it adversely affects ecosystems such as aquatic organisms and animals and plants that grow in and around public water areas. As a result, it has been recognized that it is necessary to add an appropriate concentration of disinfectant to the waste water.

  By the way, the sewer stormwater overflow to be treated by the present invention has a drastic fluctuation in water quality in a very short time, so it is very difficult to determine an appropriate disinfectant concentration. In other words, the quality of sewer stormwater overflow varies greatly depending on the rainfall conditions, and when the sewage concentration is high and the concentration of reducing organic and / or inorganic substances is high, dilution with rainwater proceeds and the sewage concentration increases. When the reduced and reducing organic and / or inorganic concentrations are reduced, the required amount of disinfectant varies greatly, and it is difficult to add an appropriate minimum amount of disinfectant according to water quality fluctuations. There is a problem.

  Therefore, in the present invention, an appropriate amount of the disinfectant that exhibits an appropriate disinfecting effect and does not generate residual halogen according to the water quality fluctuation of the waste water is obtained, and this minimum amount of disinfectant is contained in the liquid to be treated. Can be added.

  Below, the technical idea of one method for controlling the injection amount of the disinfectant in the present invention will be described based on specific examples. The following description is given with a specific example, and the present invention is not limited to this description. First, in an existing sewage treatment facility, the combined sewer overflow at various times during the rain is sampled into a beaker, BCDMH is used as the disinfectant, and the disinfectant addition amount is 3 ppm (= mg / L). In addition, the sterilization treatment was performed for 90 seconds. The relationship between the elapsed time after the start of rainfall and the number of coliform bacteria in the treated water after disinfection was obtained. The results are shown in FIG.

  From FIG. 39, the number of coliforms after disinfection is 9000 CFU / mL after 30 minutes after rain (A time point), and the number of coliform groups after disinfection is 4700 CFU / mL after 45 minutes after rain (time B). Neither of them satisfies the disinfection target value (release standard value stipulated in the Water Pollution Control Law: 3000 CFU / mL or less). It can be seen that the number of coliform bacteria after sterilization became less than 10 CFU / mL after 1 hour and 30 minutes after raining (time point C), which was below the sterilization target value. This shows that the disinfection effect is different even if the amount of sewage in rainy weather changes as rain continues, even if the same disinfectant addition amount (3 ppm), and the disinfectant excess or disinfectant understate occurs. Yes. That is, immediately after the start of rainfall, coliform bacteria in the sewage flow out at a high concentration, so a large amount of disinfectant is necessary to fully disinfect this, but at the time when a certain amount of time has passed since the start of rainfall. Since sewage is diluted by rainwater and the number of coliforms in the wastewater is reduced, the amount of disinfectant required for disinfection is reduced.

Next, 0.5 hours after the start of rainfall (point A in FIG. 39), the collected sewage overflow water was collected into a beaker, BCDMH was added at various addition rates, and sterilization was performed for 90 seconds. The number of coliforms in the treated water was counted. The results are shown in FIG. When the BCDMH addition rate is 2 ppm, the number of coliform bacteria after disinfection is 10 ⁴ CFU / mL or more, which does not satisfy the disinfection target value of 3000 CFU / mL. The number of coliforms after disinfection in the treated water was slightly over 3000 CFU / mL at a BCDMH addition rate of 4 ppm, and was below 100 CFU / mL at a BCDMH addition rate of 6 ppm, which was well below the target disinfection value. From the above, it can be understood that BCDMH needs to be added at an addition rate of about 4.2 to 4.3 ppm for disinfection of sewer overflows at this point.

  Further, after 45 minutes from the start of rainfall (point B in FIG. 39) and after 1.5 hours (point C in FIG. 39), the BCDMH addition rate and the number of coliforms after 90 seconds of disinfection were similarly determined. The results are shown in FIG. 41 and FIG. From these figures, at point B (after 45 minutes of rainfall), the BCDMH addition rate required for disinfection of sewer overflow water is about 3.5 to 3.6 ppm, and at point C (after 1.5 hours of rainfall), It can be seen that the BCDMH addition rate required for disinfection of sewer overflows is about 1.6 to 1.7 ppm.

Next, sampled sewage overflow water at point A (30 minutes after rain), point B (45 minutes after rain) and point C (1.5 hours after rain) in FIG. In a beaker, BCDMH was added at the same addition rate of 3 ppm as in the experiment of FIG. 39, and the relationship between the elapsed time after addition of BCDMH and the residual halogen concentration in the treated water was examined. The results are shown in FIG. At point A (30 minutes after the rain), the residual halogen concentration is already less than 0.1 mg / L asCl ₂ immediately after the disinfectant is added, and considering the results in FIG. It can be said that the disinfection effect of the liquid is not sufficient. At point B (45 minutes after rain), the residual halogen concentration is about 0.1 mg / L as Cl ₂ after about 20 seconds after adding the disinfectant, and it is close to almost 0 mg / L as Cl ₂ after 100 seconds. . When considered together with the result of FIG. 39 (disinfection time 90 seconds and the number of coliforms is 4700 CFU / mL), it can be said that the amount of disinfectant addition 3 ppm at time B is still slightly less than the required amount. In addition, at time C, the residual halogen concentration is as high as 0.3 mg / L as Cl ₂ at about 20 seconds after addition of the disinfectant and gradually decreases to about 150 seconds, but after about 150 seconds, it is about 0.1 mg / L. L as Cl _{2 is} strong and stable (saturation of disinfection action). From this, it can be seen that the amount of addition of 3 ppm of the disinfectant at the time point C (1.5 hours after the rain) was excessive, and residual halogen remained after the disinfection treatment.

Based on these results, in the rainwater treatment of the sewage treatment facility, the residual halogen concentration after the disinfectant treatment is shown in FIG. 43 with some allowance for surely achieving the disinfection target value. What is necessary is just to set to the substantially halfway point of B line and C line. That is, from FIG. 43, the residual halogen concentration may be set to 0.2 mg / L as Cl ₂ 20 seconds after the addition of BCDMH. In actual disinfection treatment, drainage samples are taken periodically, a predetermined concentration of disinfectant is added, and the degree of decrease in residual halogen concentration is measured. If this is higher than the set value set above (in this case, the residual halogen concentration 0.2 mg / L as Cl ₂ 20 seconds after adding the disinfectant), the amount of disinfectant input to the wastewater is set to the drainage sample. The concentration is adjusted to a value lower than the concentration input to the sample, and conversely, if the degree of decrease in the residual halogen concentration is lower than the set value, the disinfectant input amount is adjusted to a value higher than the concentration input to the drainage sample. By periodically repeating this operation and controlling the amount of disinfectant input to the waste water over time, the amount of disinfectant input is maintained at an optimum value at which a sufficient disinfecting effect is obtained and no residual halogen is generated. It becomes possible. Note that the concentration of the disinfectant to be added to the sample is preferably set to the concentration actually input into the waste water at that time. This is because a large variation in the concentration of the disinfectant can be prevented and more precise control can be performed. In addition, from the difference between the decrease in residual halogen concentration measured in the sample and the set value, the person skilled in the art will empirically determine how much the concentration actually put into the wastewater should be increased or decreased. Can do.

  Note that the curves in FIGS. 39 and 43 show almost the same tendency although there are some fluctuations if the target sewage treatment facilities are the same. Therefore, in the sewage treatment facility to be treated, if graphs as shown in FIG. 39 and FIG. 43 are created and a target value for reducing the residual halogen concentration is set, then it will be rained on the basis of this set value during subsequent rainfall. The amount of disinfectant added to the sewage can be controlled.

  FIG. 44 shows a configuration example of a sewage overflow water disinfection device according to one embodiment of the present invention configured based on this technical idea.

  The disinfection apparatus shown in FIG. 44 includes an introduction line 602 for a liquid to be treated (sewer stormwater overflow) 601, a disinfection tank (sedimentation basin) 603, and a disinfectant introduction means 604 for introducing a disinfectant into the liquid to be treated. With. As the disinfectant introduction means, the disinfectant supply devices in various forms described above can be used. The disinfectant introduction means 604 may be introduced into the line 602 upstream of the disinfection tank 603 or may be directly introduced into the disinfection tank 603. As described above, the disinfectant may be introduced into the flow path of the sewer stormwater overflow without providing the disinfection tank (sedimentation basin) 603. In addition, a sorting line 612 for collecting a test liquid sample to be tested is connected in the middle of the liquid to be processed introduction line 602. A pumping pump 616 is connected to the sorting line 612.

In order to carry out the disinfection method according to the present invention, first, as a preparatory stage, in a sewer stormwater overflow drainage facility to be treated, a plurality of overflow water samples after various times have elapsed since the start of rainfall during rainfall. , And by adding an appropriate amount of disinfectant to this and measuring the number of coliform bacteria after disinfection, the relationship between the elapsed time after rainfall and the number of coliform bacteria after disinfection (graph of FIG. 39), A relationship (graph of FIG. 43) between the elapsed time after adding the disinfectant and the residual halogen concentration of the water to be treated is created, and from these relationships, a value of the degree of residual halogen reduction to be targeted is set. For example, when the relationship shown in FIG. 39 and FIG. 43 is obtained, as described above, a target value of a residual halogen concentration of 0.2 mg / L as Cl ₂ is set 20 seconds after the addition of the disinfectant. .

Disinfection of sewer stormwater overflow is performed by adding an appropriate amount of disinfectant from the disinfectant introduction means 604 and processing in the disinfecting tank 603. In the method of the present invention, the amount of disinfectant before the disinfectant is added. The processing liquid is periodically sampled from line 612. The sampled liquid to be treated is stored in a monitoring tank 613, where a predetermined amount of a disinfectant 614 is added and mixed and stirred by a stirrer (not shown). The concentration of the disinfectant added to the monitoring tank may be the concentration of the disinfectant actually supplied to the liquid to be treated by the disinfectant introduction unit 604 at that time in order to enable precise concentration control. preferable. The monitoring tank 613 is connected to a measuring device 615 for measuring the residual halogen concentration in the liquid to be treated, and continuously measures the numerical value of the residual halogen concentration after adding the disinfectant. Examples of the residual halogen concentration measuring instrument that can be used for this purpose include a polarographic free chlorine meter (for example, product name CLM-37 or CLM-22 manufactured by Toa DKK Co., Ltd.). The measured residual halogen concentration value is recorded by a recorder 618. And regarding the said sewer stormwater overflow drainage facility, the preset target value and the value measured in the monitoring tank 613 are compared. For example, when the graphs of FIG. 39 and FIG. 43 are obtained for the sewage treatment facility, the set value is 20 mg after adding the disinfectant and the residual halogen concentration is 0.2 mg / L as Cl ₂ . In the monitoring tank 613, the residual halogen concentration of the treated water sample to which the disinfectant is added is measured 20 seconds after the disinfectant is added. When this value is higher than the set value of 0.2 mg / L as Cl ₂ , the concentration of the disinfectant introduced from the disinfectant introduction means 604 is decreased, and conversely 0.2 mg / L as Cl _2. If lower, the concentration of the disinfectant introduced from the disinfectant introduction means 604 is increased. The disinfectant input concentration is controlled by inputting the measured value of the residual halogen concentration measuring device 615 through the communication line 604 to a computer (not shown) that has input a target value for reducing the residual halogen concentration set in advance. This can be done automatically by using an automatic control device (not shown) that controls the amount of the input disinfectant according to the comparison result between the value and the measured value. The treated water sample for which the measurement of the residual halogen concentration reduction degree is completed is returned to the treated liquid introduction line 602 via the return line 617 and introduced into the disinfection tank 603 together with the treated liquid. In the disinfection tank 603, the liquid to be treated to which the disinfectant is added is retained within 1 minute when the liquid to be treated is short, and within 10 minutes when it is long, and the reaction with the disinfectant is advanced. The treated water that has been subjected to the disinfection treatment is pumped by the pump 606 and discharged into the public water area 608 through the drainage channel 607.

  In addition, it is preferable to collect a liquid sample to be processed from the upstream of the disinfectant input position. When a sample is collected from the downstream of the disinfectant input position, that is, when the liquid to be treated to which the disinfectant is added is collected as a sample, the residual halogen concentration at a certain point during the disinfection is measured. This is because the residual halogen concentration changes very sensitively depending on the elapsed time after the addition of the disinfectant, and thus cannot be controlled appropriately.

  According to this aspect, the above monitoring operation is performed periodically, for example, every 1 to 60 minutes, preferably every 5 to 20 minutes, and the concentration of the disinfectant added is adjusted according to the result. As a result, an appropriate disinfectant concentration that gives sufficient disinfecting effects and does not release residual halogens into public water areas, especially when disinfecting rainwater overflowing water, whose properties vary greatly over time. Can be maintained.

  In addition, in disinfection of sewer stormwater overflow, the amount of disinfectant added varies depending on the type of disinfectant and the nature of the overflow water, but generally 1 to 10 mg / L (ppm), preferably 2 to 6 mg. In the present invention, it is preferable to control the addition amount of the disinfectant within this range.

  As described above, the disinfection tank 603 may not be a special reaction tank, but may be a sewer stormwater overflow channel, as long as it has a contact time required for disinfection with a solid bromine-based disinfectant. Here, the contact time required for disinfection with the solid bromine-based disinfectant is set to the maximum overflow flow rate of the sewer stormwater overflow to be treated, at least 20 seconds, preferably 30 seconds, more preferably 60 seconds. Good. In addition, it is reasonable to set the maximum overflow rate of sewer stormwater overflow to be treated as follows. Overflow water is generated in the sewerage system when there is a large amount of rain in the combined sewerage system or when a large amount of rainwater is mixed from unknown water or manholes in the sewerage system. The inflow of rainwater into the sewer varies greatly depending on the rainfall conditions. In other words, in the case of a typhoon or heavy rain, flooding may occur or rivers may overflow. The present invention does not assume such an extremely large amount of rainfall. This is because the quality of sewer stormwater overflow is almost the same as that of rainwater, and disinfection is not necessary. Through various surveys, it is desirable to set the maximum overflow rate of sewer stormwater overflow as a treatment target to 20 to 10 times the amount of clear sewage. Thus, by clarifying the amount of sewer stormwater overflow to be treated and setting the contact time of the solid bromine-based disinfectant, it is possible to determine the size of the disinfection tank or sewer stormwater overflow channel it can.

  In addition, when the residual halogen concentration of the treated water to which the disinfectant is added is measured by the sewer overflow water disinfecting apparatus shown in FIG. 44 and the residual halogen concentration is high, the neutralizing is performed by adding the reducing agent. It is preferable to discharge. The system shown in FIG. 45 shows a treatment method for sewer stormwater overflow to which a disinfectant downstream of the disinfection tank 603 of FIG. 44 is added. The sewer stormwater overflow to which the disinfectant is added is guided from the disinfection tank 603 to the drainage channel. Here, the residual halogen concentration of the treated water is measured by the residual halogen concentration detector 623. When the residual halogen concentration is high, the reducing agent 621 is added and the residual halogen is neutralized in the reduction tank 622. It is discharged into a public water area 608 through a drainage channel 607. Note that the reducing agent 621 may be input directly into the drainage channel 620 as shown in FIG. 45 or may be input into the reducing tank 622. Further, neutralization may be performed in the drainage channel 607 without providing the reduction tank 622. It is sufficient that the amount of the reducing agent added is chemically equivalent to the set value of the residual halogen concentration (0.2 mg / L in the previous example). This is because the residual halogen concentration after the actual disinfection process is lower than the set value. Furthermore, the halogen detector 623 is linked with the disinfectant introduction means shown in FIG. 44 to control the amount of disinfectant to be introduced when the residual halogen concentration in the water to be treated in the drainage channel 620 is high. You can also. In this way, halogen addition can be made harmless by minimizing the addition amount of the solid bromine-based disinfectant and without increasing the addition amount of the reducing agent.

  Further, in the disinfection system for sewer stormwater overflow according to the present invention, the rainfall disclosure time, the total amount of rainfall, and the rainfall duration time are predicted from the rainfall information of the treatment area, and the addition amount of the disinfectant is determined based on the predicted value. Can be controlled.

  Conventionally, as a control method for this type of wastewater disinfection device, the inflow amount of wastewater, the inflow pollution load, the rainfall amount, the rainfall intensity are measured by a measuring device provided in the treatment plant where the wastewater disinfection device is installed, and the measurement is performed. Based on the measured values, the number of coliforms in the wastewater flowing into the wastewater disinfection device was estimated to control and control the amount of drug added.

  FIG. 46 is a diagram showing a sewage pipe network for collecting sewage such as household wastewater and factory wastewater, and a treatment area. Wastewater such as sewage generated in the treatment area X, sewage containing rainwater, and rainwater flowing down the ground surface flows into a sewage pipe 711 provided in the treatment area X. The waste water that flows into each sewage pipe 711 joins, and the joined waste water flows directly into a sewage disinfection device provided in the sewage treatment plant 710 or is sent to the sewage treatment plant by the relay pumps P1, P2, and P3. .

  In one aspect of the present invention, in such a sewage system, a disinfecting apparatus for disinfecting sewage in a treatment area, sewage containing rainwater, drainage containing rainwater flowing down the surface of the earth, and particularly sewage overflow water in rainy weather with a chemical. In the control method, rainfall information is collected from the measurement points provided in the treatment area or measurement points provided in the treatment area and adjacent treatment areas, and the rainfall start time, the total amount of rainfall and the rainfall continuation in the treatment area are obtained from the rain information. Time prediction is performed, and the drainage disinfection device is controlled by predicting the drug addition amount, the drug consumption amount, and the drainage disinfection device operation start time from the predicted rainfall start time, total rainfall amount, and rainfall duration.

  When such a method for controlling a disinfection device is adopted, the rain start time in the processing area is determined from the measurement points provided in the processing area or the rain information collected from the measurement points provided in the processing area and the adjacent processing area. Since the total amount of rainfall and the rainfall duration time are predicted, the amount of added medicine, the amount of consumed medicine, and the operation start time of the drainage disinfection device can be predicted in real time.

  Further, according to another embodiment, in the control device of the disinfection device that disinfects wastewater including wastewater including rainwater and rainwater flowing down the surface of the processing area, particularly drainage including rainwater flowing down on the surface of the ground, particularly in a rainy weather, the treatment area Or, the rainfall information measuring means for measuring the rainfall information of the processing area and the adjacent processing area, and the rainfall start time, the total amount of rainfall and the rainfall duration in the processing area are predicted from the rainfall information measured by the rain information measuring means. Rainfall information prediction processing means and coliform group number prediction processing for predicting the drug addition amount, the drug consumption amount, and the drainage disinfection device operation start time from the rain start time, the total rainfall amount, and the rain duration time predicted by the rain information prediction processing means Means can be provided.

  As described above, the control device of the wastewater disinfection device includes the rain information measuring means for measuring the rain information of the treatment area or the treatment area and the adjacent treatment area, and the rain start time, the total amount of rainfall, and the rainfall duration in the treatment area from the rain information. Since it has a precipitation information prediction processing means for predicting and a coliform group number prediction processing means for predicting a drug addition amount, a medicine consumption amount and a disinfection device operation start time from a rainfall start time, a total rainfall amount and a rainfall continuation time, It is possible to predict the addition amount, chemical consumption, and drainage disinfection device operation start time in real time.

  According to another aspect, in the above-described disinfection device control device, the regional characteristic simulation means for predicting the inflow water amount and inflow pollution load of the wastewater flowing into the wastewater disinfection device from the rain information measured by the rain information measurement means; Predicted value correction processing means for correcting the drug addition amount, the drug consumption amount, and the drainage disinfection device operation start time based on the inflow water amount and the inflow pollution load predicted by the regional characteristic simulation means can be provided.

  As described above, since it includes the predicted value correction processing means for correcting the drug addition amount, the drug consumption amount, and the disinfection device operation start time based on the inflow water amount and the inflow pollution load predicted by the regional characteristic simulation means, the drug addition amount, Prediction of chemical consumption and drainage disinfection device operation start time can be more accurately performed.

  According to still another aspect, in the control device for the disinfection device described above, the turbidity measuring means for measuring the inflow turbidity of the treated water flowing into the disinfection device is provided, and the rainfall predicted by the rainfall information prediction processing means From the start time, the total amount of rainfall, the duration of rainfall, and the inflow water turbidity measured by the turbidity measuring means, it is possible to predict the drug addition amount, the drug consumption amount, and the drainage disinfection device operation start time.

  Thus, the amount of added medicine, the amount of medicine consumed, and the start time of the disinfection device are calculated from the rainfall start time predicted by the rainfall information prediction processing means, the total rainfall amount and the duration of rainfall, and the inflow water turbidity measured by the turbidity measuring means. Since the prediction is made, it is possible to more accurately predict the drug addition amount, the drug consumption amount, and the drainage disinfection device operation start time.

  According to yet another aspect, in the control device of the disinfection device for disinfecting wastewater including wastewater including rainwater and rainwater flowing down the surface of the treatment area, particularly drainage including rainwater flowing down the surface of the earth, particularly in the rainy weather, Rain characteristics measuring means for measuring rainfall information in the treatment area and adjacent treatment areas, and regional characteristics for predicting the amount of influent water flowing into the waste water disinfection device and the inflow pollution load from the rain information measured by the rain information measuring means Drug addition from the drug addition rate set by the simulation means, the drug addition rate setting means for preliminarily setting the drug addition rate with respect to the drainage, and the inflow water amount, the inflow pollution load and the drug addition rate setting means predicted by the regional characteristic simulation means A medicine addition amount calculation processing means for predicting the amount and the medicine consumption amount can be provided.

  In this way, the rainfall information measuring means for measuring the rainfall information of the treatment area or the treatment area and the adjacent treatment area, and the regional characteristic simulation means for predicting the amount of influent water flowing into the waste water disinfection device and the inflow pollution load from the rain information. And a chemical addition rate setting means for setting a chemical addition rate with respect to the water to be treated in advance, and a chemical addition amount calculation processing means for predicting the chemical addition amount and the chemical consumption amount from the inflow water amount, the inflow pollution load and the chemical addition rate. Therefore, the drug addition amount and the drug consumption amount can be predicted in real time with a simple configuration.

  According to another aspect, in any of the above-described control devices for a disinfection device, the amount of rainfall in the treatment facility where the disinfection device is installed, the rainfall intensity, the amount of inflow water to be treated flowing into the disinfection device, the disinfection device Measured value measurement means for measuring the amount of drug supplied and the concentration of residual drug discharged from the disinfection device is provided, and the amount of drug added, the amount of drug consumed, and the disinfection based on the measured value measured by the measured value measurement means An actual value correction processing unit for correcting the prediction of the apparatus operation start time is provided.

  As described above, since the measurement value correction processing means for correcting the prediction of the drug addition amount, the drug consumption amount, and the disinfection device operation start time with the measurement values measured by the actual value measurement means is provided, the drug addition amount, the drug consumption amount In addition, the sterilizer operation start time can be predicted more accurately.

  FIG. 47 is a diagram showing a sewage pipeline network that collects waste water to be sterilized by the disinfecting apparatus described above, a processing area, and an adjacent processing area. As shown in FIG. 47, treatment areas A, B, C, D, and E having similar sewage treatment plants are disposed around the treatment area X of the sewage treatment plant 710 where the sewage overflow water disinfection device is installed. Adjacent to each other. The basic configuration of the sewage pipe network in this embodiment is the same as that of the sewage pipe network shown in FIG.

  FIG. 48 is a diagram illustrating a configuration example of a control device of the drainage disinfection device according to the present invention. As shown in the figure, a plurality of rainfall information measuring means 720, 720,... Are provided in the processing area A, and the rainfall information 721a, 722a, etc. in the processing area A are measured by the rain information measuring means 720, 720,. It can be done. Although not shown, each rainfall information measuring means 720 is provided in a facility having a pump station, a drainage station, a treatment plant, and a measurement facility in which a relay pump in the treatment area A is installed. For other processing areas B, C, D, E, and X, rainfall information such as rainfall amount and rainfall intensity in each processing area is measured by the same rainfall information measuring means. The rainfall information measured in each of the processing areas A, B, C, D, E, and X is continuously or periodically transmitted to the control device 730 using a data transmission device or an AMeDAS system using a commercially available telephone line. To be transmitted.

  FIG. 49 is a diagram showing a mapping process used in the control method of the sewer overflow water disinfection device in rainy weather. FIG. 49 (a) shows the rainfall information measured in each processing area A, B, C, D, E, X. (B) is a schematic view after the elapse of time t in FIG. (A). The rainfall information from the processing areas A, B, C, D, E, and X input to the control device 730 is mapped by the rainfall information mapping processing means 731 into a schematic diagram as shown in FIG. . Since the rainfall information measured in each processing area A, B, C, D, E, and X is transmitted continuously or periodically to the control device 730, the schematic diagram shown in FIG. Later, a schematic diagram as shown in FIG. Note that the rain information subjected to the mapping process is represented by the strength of the rain intensity as indicated by A.

  Next, from the time series transition (see FIG. 49) of the rainfall information that is continuously or periodically transmitted and mapped, the rainfall information estimation processing means 732 determines the rainfall start time, total rainfall amount, and rainfall duration in the processing area X. Make a prediction. Further, the rainfall information estimation processing means 732 calculates the predicted rainfall amount 733, the predicted rainfall intensity 734, and the processing target that flows into the disinfection device from the predicted rainfall start time, total rainfall amount, and rainfall duration time in the processing area 710 of the processing area X. Calculate the expected water inflow 735. The calculated expected rainfall 733, expected rainfall intensity 734, and expected inflow 735 are input to known coliform group number estimation processing means 736. Further, the inflow turbidity 751 of the water to be treated flowing into the disinfection apparatus measured by the turbidity measuring means 750 installed in the sewage treatment plant 710 is input to the coliform group number estimating means 736.

  The coliform group number estimation processing means 736 estimates the number of coliform groups from the input predicted rainfall amount 733, predicted rainfall intensity 734, predicted inflow amount 735, and inflow water turbidity 751, and the necessary amount of drug addition 736a for the estimated coliform group number. The drug consumption amount 736b and the drainage disinfection device operation start time 736c are predicted.

  Next, from the actual measurement measuring means 752 provided in the sewage treatment plant 710 of the treatment area X, the amount of rainfall 753 at the treatment plant 710, the rainfall intensity 754, the amount of inflow water 755 flowing into the waste water disinfection device, and the waste water disinfection device. The supply amount 756 of the halogen-based chemical supplied and the concentration of residual chemical 757 in the discharged water discharged from the waste water disinfection device are measured. The measured rainfall amount 753, rainfall intensity 754, inflow water amount 755, chemical supply amount 756, and discharged water residual chemical concentration 757 are input to the predicted value / actual value correction processing means 737.

  The predicted value / actual value correction processing means 737 includes the input rainfall amount 753, rainfall intensity 754, inflow water amount 755, drug supply amount 756, discharge water residual drug concentration 757 to drug addition amount 736a, drug consumption amount 736b, waste water A correction value for correcting each predicted value of the sterilizer operation start time 736c is obtained. The obtained correction values are added and processed by the correction value addition processing means 737a, 737b, and 737c to the drug addition amount 736a, the drug consumption amount 736b, and the drainage disinfection device operation start time 736c. 742 and drainage disinfection device operation start time 743 are obtained.

  The control device 730 uses the predicted values of the drug addition amount 741, the drug consumption amount 742, and the drainage disinfection device operation start time 743 obtained by adding the correction values, and the drainage disinfection device operation and the drug addition amount. Control of drug consumption. The drug addition amount 741 is used for real-time control of drug addition as an actual drug addition amount setting value of the drainage disinfection device. Further, the drug consumption 742 is compared with the amount of drug stocked in the treatment plant 710, and when the drug to be added to the drainage disinfection device is insufficient, an alarm is issued to the operator. Used to seek replenishment. Further, the drainage disinfection device operation start time 743 informs the operator of the drainage disinfection device operation start time and is used as an automatic operation start command for the drainage disinfection device.

  As described above, based on the rainfall information measured by the rainfall information measuring means 20 in each processing area A, B, C, D, E, X, the rainfall information estimation processing means 732 is provided in the processing area X. The rainfall start time, the total rainfall amount, and the rainfall duration time are predicted, and the predicted rainfall amount 733, the predicted rainfall intensity 734, and the expected inflow amount 735 at the treatment plant 710 in the processing area X are obtained. The Escherichia coli group number estimation processing means 736 estimates the coliform group number from the predicted inflow 735, and predicts the drug addition amount 736a, the drug consumption amount 736b, and the drainage disinfection device operation start time 736c necessary for controlling the drainage disinfection device corresponding thereto. Thus, each predicted value can be predicted in real time.

  Further, the coliform group number estimation processing means 736 predicts the drug addition amount 736a, the drug consumption amount 736b, and the disinfection device operation start time 736c from the predicted rainfall 733, the predicted rainfall intensity 734, the predicted inflow amount 735, and the inflow water turbidity 751. Therefore, prediction of each predicted value can be performed more accurately.

  Further, the predicted value / actual value correction processing means 737 obtains a correction value from the rainfall amount 753, the rainfall intensity 754, the inflow water amount 755, the medicine supply amount 756, and the discharged water residual medicine concentration 757, and the correction value addition processing means 737a, 737b, 737c. Thus, each correction value is added to the drug addition amount 736a, the drug consumption amount 736b, and the disinfection device operation start time 736c to obtain the drug addition amount 741, the drug consumption amount 742, and the disinfection device operation start time 743. Can be predicted more accurately.

  FIG. 50 is a diagram illustrating another configuration example of the control device of the disinfection device. The basic configuration of the control device for the disinfection device shown in FIG. 50 is substantially the same as that of the drainage disinfection device shown in FIG. The control device of the present disinfection device is different from the control device of the disinfection device shown in FIG. 48 in that a regional characteristic simulation means 760 is provided.

  The rainfall information 721x, 722x, and the like measured by the respective rainfall information measuring means 720 in the processing area X are input to the rainfall information mapping processing means 731 of the control device 730, and the regional characteristic simulation means. 760 is input. The regional characteristic simulation means 760 is a commercially available regional characteristic simulation software, which inputs pre-registered landform information, rainwater collection route, sewage pipe network, sewage discharge population, and sewage discharge type as set initial conditions. Then, hydraulic / water quality analysis is performed by inputting the rain information 721x, 722x.

  The regional characteristic simulation means 760 obtains the expected inflow amount 761 and the expected inflow pollution load 762 of the wastewater flowing into the wastewater disinfection device from the rainfall information in the treatment area X. The calculated expected inflow water amount 761 and the expected inflow pollution load 762 are predicted together with the rainfall amount 753, the rainfall intensity 754, the inflow water amount 755, the drug supply amount 756, and the discharged water residual drug concentration 757 measured by the actual value measuring means 752. Value / actual value correction processing means 737.

  The predicted value / actually measured value correction processing means 737 is based on the input rainfall amount 753, rainfall intensity 754, inflow water amount 755, drug supply amount 756, discharged water residual drug concentration 757, expected inflow amount 761, and expected inflow pollution load 762. Correction values for correcting the addition amount 736a, the drug consumption amount 736b, and the disinfection device operation start time 736c are obtained. The correction values are added to the predicted values of the added amount of medicine 736a, the amount of medicine consumed 736b and the drainage disinfection device operation start time 736c from the coliform group number estimation processing means 736 by the correction value addition processing means 737a, 737b and 737c. Then, predicted values of the drug addition amount 741, the drug consumption amount 742, and the drainage disinfection device operation start time 743 are obtained. The control device 730 controls the operation of the drainage disinfection device, the amount of added medicine, and the amount of consumed medicine according to each predicted value.

  As described above, the predicted value / actual value correction processing unit 737 uses the predicted inflow water amount 761 and the predicted inflow pollution load 762 obtained by the regional characteristic simulation unit 760 to add the drug addition amount 736a, the drug consumption amount 736b, and the drainage disinfection device operation start time 736c. Correction values are obtained, and each correction value is added to the added amount of medicine 736a, the amount of medicine consumed 736b from the E. coli group number estimation means 736, and the disinfection device operation start time 736c by the correction value addition processing means 737a, 737b, 737c. By processing, since the medicine addition amount 741, the medicine consumption amount 742, and the disinfection apparatus operation start time 743 are obtained, prediction of each predicted value can be performed more accurately.

  In the above embodiment, a case has been described in which only the rainfall information 721x, 722x... Measured by the respective rainfall information measuring means 720 in the processing area X is input to the regional characteristic simulation means 760. However, the present invention is not limited to this. Instead, the rainfall information of the processing area X and the adjacent processing areas A, B, C, D, and E may be input.

  FIG. 51 is a diagram illustrating another configuration example of the control device of the disinfection device. First, rainfall information 721x, 722x, etc., such as the rainfall amount and rainfall intensity measured by each rainfall information measuring means 720 in the processing area X, is input to the regional characteristic simulation means 760.

  The regional characteristic simulation means 760 obtains an estimated inflow amount 761 and an expected inflow pollution load 762 of the treated water flowing into the disinfection device from the rainfall information in the treatment area X. The calculated expected inflow water amount 761 and the expected inflow pollution load 762 are input to the chemical addition amount calculation processing means 738.

  Also, the drug addition rate calculation processing means 738 is inputted with the drug addition rate 739a set in advance by the drug addition rate setting means 739 for setting the drug addition rate for the waste water flowing into the disinfection apparatus. The medicine addition amount calculation processing means 738 predicts the medicine addition amount 736a and the medicine consumption amount 736b from the inputted medicine addition rate 739a, predicted inflow water amount 761, and expected inflow pollution load 762.

  From the measured value measuring means 752 provided in the treatment area 710 of the treatment area X, the rainfall amount 753, the rainfall intensity 754, the inflow water amount 755, the chemical supply amount 756, and the discharged water residual chemical concentration 757 in the treatment area 710 are measured. The measured rainfall amount 753, rainfall intensity 754, inflow water amount 755, chemical supply amount 756, and discharged water residual chemical concentration 757 are input to the predicted value / actual value correction processing means 737 of the control device 730.

  The predicted value / actual value correction processing means 737 receives the correction values for correcting the predicted values of the drug addition amount 736a and the drug consumption amount 736b from the drug addition amount calculation processing means 738, and the input rainfall amount 753 and rainfall intensity 754. Inflow water amount 755, chemical supply amount 756, and discharge water residual chemical concentration 757 are obtained. The correction values are added to the predicted values of the drug addition amount 736a and the drug consumption amount 736b from the drug addition amount calculation processing unit 738 by the correction value addition processing units 737a and 737b, and the drug addition amount 741 and the drug consumption amount are added. 742 is obtained. The control device 730 controls the drainage disinfection device based on the drug addition amount 741 and the drug consumption amount 742.

  As described above, the predicted inflow water amount 761 and the expected inflow pollution load 762 are obtained by the regional characteristic simulation unit 760 from the rainfall information 721x, 722x... Measured by the respective rain information measurement units 720 in the processing area X, and the chemical addition amount calculation is performed. The means 738 predicts the drug addition amount 741 and the drug consumption amount 742 from the predicted inflow water amount 761, the expected inflow pollution load 762, and the drug addition rate 739a set by the drug addition rate setting means 739. Can be predicted.

  In the above embodiment, the case has been described in which only the rainfall information 721x, 722x... Measured by each of the rainfall information measuring means 720 in the processing area X is input to the regional characteristic simulation means 760. It is not limited, and each rainfall information of the processing area X and the adjacent processing areas A, B, C, D, and E may be input.

  In addition, the above describes the form of disinfecting sewer stormwater overflow at a sewage treatment plant, but sewer stormwater overflow facilities such as a spout chamber and a pumping station (drainage station) are used to prevent sewer stormwater overflow. The control device described above can also be applied to the form of disinfecting running water.

  Furthermore, the rainwater sewer overflow water disinfecting apparatus according to the present invention can be provided with an abnormality detection mechanism (solid bromine-based disinfectant addition amount detection means) that can detect an excess or an excess of the solid bromine-based disinfectant addition amount. .

  The solid bromine-based disinfectant addition amount detecting means that can be used in the present invention is a method in which the residual halogen concentration measured in the treated water immediately after the addition of the solid bromine-based disinfectant and the treated water to which the disinfectant is added are discharged. This is a means for detecting an excess and / or an excessive amount of the halogen-based chemical additive by comparing the residual halogen concentration measured in the discharge channel with a predetermined threshold value and / or comparing both residual halogen concentrations. In other words, if the residual halogen concentration measured in the treated water immediately after the addition of the halogen-based chemical and the residual halogen concentration measured in the discharge channel exceed the predetermined threshold values, it is detected that the halogen-based chemical addition amount is excessive or too small. To do. In addition, the residual halogen concentration measured in the treated water immediately after the addition of the halogen-based chemical is compared with the residual halogen concentration measured in the discharge channel, and the disinfectant consumption is set in advance using the concentration difference as the disinfectant consumption. If the amount of disinfectant used is less than the low level threshold compared to the low level threshold, it means that more disinfectant is added than necessary, but halogenated chemicals. It is detected as an excessive amount.

  In addition, the solid bromine-based disinfectant addition amount detection means compares the solid bromine-based disinfectant possession amount (consumption amount determined from the possession amount) with the discharge amount, and thus the excess of the solid bromine-based disinfectant addition amount and / or It is a means for detecting under-exposure. That is, the ratio of the error between the actual consumption calculated from the difference in the amount of solid bromine-based disinfectant held and the discharge measured by a measuring device such as the number of revolutions or flow meter is the preset drug discharge amount added. When the level threshold (ratio) of the amount is exceeded, it is detected that the amount of drug addition is excessive or too small.

  The solid bromine-based disinfectant addition amount detection means is a means for detecting an excess of the solid bromine-based disinfectant addition amount by monitoring images of fish inhabiting the discharge channel. In other words, if the number of individuals that are determined to be drifting due to the death or weakness of the fish being image monitored exceeds the preset high-level threshold for the number of drifting fish individuals, it is determined that the drug has been added excessively. Detect.

  FIG. 52 is a system diagram showing a state in which disinfection of treated water is performed by an embodiment of a disinfection apparatus having an abnormality detection mechanism that can be used in the present invention. As an example, powdered solid bromine-based disinfection This shows a method in which an agent is used, dissolved in water to form disinfecting water, and this is added to water to be treated. The configuration of the following apparatus can be applied to the disinfectant storage / supply apparatus of the various forms described above and the disinfecting apparatus of the system in which the solid bromine-based disinfectant is put into the water to be treated as solid. Moreover, in the following description, although the form which disinfects sewer stormwater overflow in a sand basin is explained, various forms which disinfect in the flow path of sewer stormwater overflow as described above also Can be applied.

  In FIG. 52, reference numeral 810 denotes a sand basin into which sewer stormwater overflow flows and flows out, which is sterilized by a disinfection device. A part of the sewer stormwater overflow flowing into the inflow section 810a of the sand basin 810 is pumped up by the pump P1, foreign matter is removed by the screen 820, the flow rate is measured by the raw water flow meter 821, and then the disinfectant is added. Sent to device 830.

  In the disinfectant addition device 830, the solid bromine-based disinfectant 832 charged in the hopper 831 is supplied to the ejector 834 by a predetermined amount from the supply unit 833 by driving the motor M1, and added to the waste water. The water to which the disinfectant is added is sent into the dissolution tank 841 of the dissolution apparatus 840 and stirred by the stirrer 842 driven by the motor M2, and the disinfectant is reliably dissolved, and then flows into the sand basin 810 by the pump P2. By returning to the section 810a, the water to be treated is sterilized and discharged from the discharge channel 811 to the public water area 812 such as a river through the sand settling section 810b.

  In the apparatus described below, three types of abnormality detection means are installed in order to quickly and surely prevent excessive sterilization or sterilization failure of treated water when performing the above-mentioned sterilization. That is, there are provided means for detecting whether the amount of added medicine is excessive or too small, means for monitoring that the addition of the medicine is surely executed, and means for complementing the determination of excess amount of the added medicine. This will be described below.

  In executing the disinfection, it is necessary to detect the excess or under-charge of the chemical addition amount in order to prevent excessive disinfection or disinfection failure of the water to be treated. Therefore, residual halogen concentration meters 813 and 843 are installed in the discharge water channel 811 and the dissolving device 840, respectively, and the measured values of both are input to a computer (or an electric circuit) (not shown), whereby the amount of added drug is determined according to the processing procedure shown in FIG. Detect excess and under.

  53, first, the residual halogen concentration in the discharge water channel 811 measured by the residual halogen concentration meter 813 and the residual halogen concentration in the dissolving device 840 measured by the residual halogen concentration meter 843 are input. 53, first, the residual halogen concentration in the discharge water channel 811 measured by the residual halogen concentration meter 813 is compared with the preset discharge water residual halogen concentration high level threshold value 901. If it exceeds this, it is determined that the drug is excessively added, and a residual halogen high level determination output 870 is output.

  Next, in the case where the residual halogen concentration in the melting apparatus 840 measured by the residual halogen concentration meter 843 is less than the low level threshold value 902 compared with the preset dissolution bath residual halogen concentration low level threshold value 902 It is determined that the chemical addition is too small, and a residual halogen low level determination output 871 is output. Next, when the residual halogen concentration in the dissolution apparatus 840 is higher than the high-level threshold value 903 compared with the preset dissolution tank residual halogen concentration 903, it is determined that the chemical is excessively added and the residual A halogen high level determination output 870 is output.

  Further, the difference between the residual halogen concentration in the dissolving device 840 measured by the residual halogen concentration meter 843 and the residual halogen concentration in the discharge water channel 811 measured by the residual halogen concentration meter 813 is regarded as the disinfectant consumption, and this disinfectant consumption. If the amount is less than the low threshold value 904 compared with the preset residual halogen concentration difference (disinfectant consumption) low level threshold 904, it is determined that the drug is excessively added and the residual halogen high level is determined. Output 870 is output. In other words, the amount of disinfectant increases when there are many substances to be sterilized, so the amount of consumption of disinfectant is low, even though it is not consumed (even though there are not many substances to be sterilized). Disinfectant is added. Therefore, even if the residual halogen concentration in the dissolving device 840 and the residual halogen concentration in the discharge water channel 811 are individually within the predetermined allowable values, it is determined that more disinfectant than necessary is added. To do.

  According to the above detection means, the residual halogen concentration measured in the dissolution tank 841 (that is, the residual halogen concentration measured in the waste water immediately after the addition of the halogen-based chemical) and the residual halogen concentration measured in the discharge water channel 811 downstream thereof are set in advance. Compared with the residual halogen concentration threshold value and the like, it is possible to determine whether the drug is added excessively or too little, so that there is a time delay from the drug addition to the measurement point as compared with the case where measurement is performed only with the discharge water channel 811 as in the past. Therefore, it is possible to quickly and surely determine whether the drug is excessively added or too small. Further, since the residual halogen concentration measured at two points is compared and the concentration difference is used as the disinfectant consumption amount to determine the excessive drug addition, the excessive drug addition can also be determined from this point.

  In performing disinfection, it is necessary to monitor that drug addition is being performed reliably. Therefore, the hopper weight 35 is measured by the hopper weight meter X1 provided in the hopper 831 of the disinfectant adding device 830, the rotation number 36 of the motor M1 is measured, and both measured values are input to a computer (or an electric circuit) not shown. By doing so, it is monitored that the addition of the medicine is surely executed according to the processing procedure shown in FIG.

  That is, in the medicine discharge amount determination process flow of FIG. 54, first, the supply machine speed 836 sampled k + 1 times in the medicine discharge amount determination process sampling period 913 set in advance from time t is set to [Supplier speed-discharge quantity. Conversion factor] The ratio between the powder medicine discharge amount obtained by multiplying 910 and the powder medicine consumption amount obtained from the difference between the hopper weight 835 at time t and time t + k is a preset medicine discharge amount addition. When the amount is lower than the low level threshold value 911, it is determined that the drug addition amount is too small, and the drug addition amount underdetermination output 881 is output. That is, the amount of powder medicine consumed originally determined from the difference in the hopper weight 835 and the amount of powder medicine discharged from the feeder rotation speed 836 should match, but the powder medicine obtained from the difference in the hopper weight 835. The fact that the amount of powder medicine discharged from the feeder rotation speed 836 is larger than the amount of consumption means that the amount of powder medicine discharge determined from the feeder rotation speed 836 is more apparent than the amount of discharge actually discharged. This means that the predetermined powder medicine discharge amount cannot be obtained depending on the supply machine rotational speed 836 determined to obtain the predetermined powder medicine discharge amount. This means that a predetermined powder medicine discharge amount cannot be obtained due to a problem that must be increased or a mechanical failure of the supply machine 833, that is, the medicine addition amount is too small.

  On the other hand, when the ratio between the powder medicine discharge amount and the powder medicine consumption is equal to or higher than the preset medicine discharge amount addition level high level threshold 912, it is determined that the medicine addition amount is excessive, and the medicine addition amount An excess determination output 882 is output. If neither condition is met, no output is made.

  In this way, by comparing the powder drug discharge amount and the powder drug consumption amount, it is possible to monitor whether or not the drug addition has been reliably executed in real time.

  In order to complement the abnormality determination by the residual halogen concentration meter in order to carry out disinfection even when the residual halogen concentration meter of the disinfection device becomes abnormal in measurement and it becomes impossible to determine whether the drug is excessively added or too small, as shown in FIG. It is possible to execute a fish inhabiting state determination process for a discharge channel using image processing technology.

  That is, the outlet monitoring camera 814 is installed at the outlet of the outlet water channel 811. In the fish abnormality determination processing flow shown in FIG. 55, the video data of the outlet monitoring camera 814, the fish determination pattern 921 set in advance, and The similar image pattern is determined to be a fish inhabiting the discharge water channel 811. Then, for each image pattern determined to be fish, two fish drift determination movement range coordinates 922 and 923 indicating the movement range of the fish are determined from the first detected coordinates, and the image determined to be fish. If the pattern exists within the coordinate range (the range surrounded by the dotted line) for a time exceeding the time set in the fish drift determination time 924, the fish is drifting due to death or weakening. judge. The above determination process is performed for all image patterns determined to be fish, and if the number of drifting fish individuals exceeds a preset drifting fish population high level threshold 925, excessive drug addition And the fish abnormality determination output 890 is output.

  The outputs 870, 871, 881, 882, and 890 relating to the excess and under-determination of the drug addition determined as described above are used for the purpose of notifying the operator of the disinfection device as an alarm, Used for the purpose of executing automatic control to increase or decrease the amount of drug input depending on the amount of decrease, or for the purpose of executing automatic stop of drug input or automatic input of neutralizing drug when the amount of drug addition is excessive be able to.

  As shown in FIG. 56, when a solid bromine-based disinfectant storage tank 951 is installed on a scale (load cell) 953 and the supply speed of the disinfectant becomes abnormally high due to a failure of the cutting device 952 or the like, detection is performed. By detecting the abnormal supply by the device 956 and operating the emergency supply stop device 955 to stop the supply of the solid bromine-based disinfectant from the supply pipe 954, the solid bromine-based disinfectant is supplied in an abnormally large amount. It is possible to prevent the environment around the outlet from deteriorating due to residual halogen.

  Examples of the operation method of the apparatus for disinfecting sewer stormwater overflow with the solid bromine-based disinfectant according to the present invention include the following methods. When the sewer stormwater overflow to be treated is overflow water from a combined sewer or diversion sewer pump station (drainage station), the overflow water is often discharged as follows. The pumping station has a sand basin or rainwater storage facility. In FIG. 57, when rainwater enters the sewer pipe 961 and the amount increases, the movable gate 962 is opened, and the rainwater-mixed sewage overflows (rainwater sewer overflow). Overflow water is accommodated in a sand basin or rainwater storage facility 963 and flows into the pump well 972 through a screen 971. A rainwater pump is arranged in the pump well 972, and the rainwater pump 964 is activated after a predetermined time has passed since the movable gate 962 was opened, and the sewer stormwater overflow in the sand basin or the rainwater storage facility 963 is discharged. It is guided to a channel 965 and discharged from a discharge channel 965 to a public water area 966 such as a river. A plurality of rainwater pumps 964 are usually installed, and the number of operating rainwater pumps 964 is controlled by the water level in the pump well 972. The operation of the movable gate 962 is usually performed by an operator in the central monitoring room based on various types of weather information such as the probability of rainfall, rainfall information, and rainfall. In such a case, when the movable gate 962 is activated and the sewer stormwater overflow flows into the sand basin or the rainwater storage facility 963, first, the pump 967 is moved to take out a part of the sewer stormwater overflow. Then, the mixing device 969 can be mixed with the solid bromine-based disinfectant 968 to adjust the disinfecting water and put it into the sand basin or the rainwater storage facility 963. At this time, a predetermined amount of a solid bromine-based disinfectant calculated from the capacity of the sand basin or rainwater storage facility 963 can be added in advance to disinfect the sewer stormwater overflow accumulated in the sand basin or rainwater storage facility 963. . After that, when the rainwater pump 964 is activated and the discharge of sewer stormwater overflow into the public water area begins, supply of disinfectant so that an appropriate amount of solid bromine-based disinfectant is introduced in accordance with the flow rate of the overflow water. Can be controlled. FIG. 57 shows a method in which a solid bromine-based disinfectant is dissolved in water to form disinfecting water, and this is thrown into sewer stormwater overflow, but the solid bromine-based disinfectant remains solid. A method of throwing it into sewer stormwater overflow in a sand basin may be used. Such control includes the amount of water, residual halogen concentration, discharge gate (movable gate) opening signal, rainwater pump operation signal, etc. in sewer stormwater overflow facilities such as pump stations, sewer pipes, and sewage treatment plants. Preferably, the monitor value is sent to a remote management facility such as a central control room and controlled remotely at the management facility. In other words, it is preferable that the disinfectant input can be controlled unattended on the site of the sewer overflow overflow facility in the rain. The concept of such a control system is shown in FIG.

  According to the control system shown in FIG. 58, the bromine disinfection device is automatically controlled by a control unit such as a sequencer incorporated in the accompanying power control panel 1002.

  The chemical supply unit 1003 includes a powder flow tank (including a load cell), a powder flow machine, a chemical supply machine, a melting cone, and attached valves.

  The raw water turbidity meter 1004 always outputs the turbidity of the incoming raw water.

  The dissolved water flow meter 1005 always outputs a water supply amount for dissolving chemicals.

  The residual halogen meter 1007 always outputs the residual halogen concentration of the discharged water.

In the power control panel 1002, the following control is performed.
・ Injection amount control: “Discharge water amount” data from the central operation room 1001 and “Rotation number” data from the supply device attached to the chemical supply device 1003 are taken and converted into “Powder supply amount” to change the water amount. In contrast, the injection rate is kept constant and control is performed so that appropriate injection is performed.
・ Injection rate control: By taking the data of “operator operating time” and “discharged water”, and reducing the chemical injection rate step by step assuming that the number of coliforms decreases with time, overinjection Control to prevent.
Injection rate calculation control: “turbidity” data from raw water turbidity meter 1004, “discharge flow rate”, “rainfall intensity”, “rainfall” data from central operation room 1001, and coliform bacteria contained in raw water The number is calculated, the injection amount (rate) is determined, and injection control is performed.
-Operation sequence management: For the auxiliary equipment 1006, for example, the "operated operation" command of the dust collector, the "opening / closing" of the gate for the CSO discharge facility 1008, etc., the associated operation management is performed.
Injection determination: The amount of powder supplied by the chemical feeder 1003 is calculated from the rotational speed of the feeder, but this alone cannot detect an idle operation due to a bridge or the like. Therefore, the powder fluctuation weight is measured by the load cell of the powder flow part storing the chemical, and the consistency is determined by comparing with the calculated value from the rotation speed.
・ Each data recording: Measurement values from instrumentation, failure history, etc. are recorded with a recorder in the panel.

  If necessary, the operation mode, status display, and various data are sent to the central operation room 1001 so that the operation and monitoring can be performed from the central operation room.

  It is preferable that the injection amount of the disinfectant after the start of discharge, that is, after the start of the rainwater pump operation, is gradually reduced in several stages by a timer. For example, the injection rate of the disinfectant is 10 mg / L, 7 mg / L, 5 mg / L, 3 mg, divided into four stages of 0 to 1 hour, 1 to 3 hours, 3 to 5 hours, and 5 hours after the start of operation. It can be gradually reduced like / L. The number of addition stages, the length of each stage, the disinfectant injection rate at each stage, and the like can be changed as appropriate based on information such as the amount of rainfall, the rainfall type, and the rainfall forecast. For example, several patterns of addition programs can be set in advance, and selection can be made based on information such as rainfall amount and rainfall type. Even in such a case, a halogen concentration meter is installed in the sewer stormwater overflow downstream of the disinfectant injection point, and if the residual halogen concentration is abnormally high, the injection is stopped or an alarm is issued. It is preferable to perform control. Furthermore, as a safety measure on the control equipment, for example, a disinfectant over-injection detection mechanism is provided by a residual halogen meter installed on the discharge side, and when over-injection is detected, supply is stopped or disinfectant supply Assuming that the supply is delayed due to a bridge etc. in the device, an alarm is issued when the weight of the disinfectant storage tank has not changed for a certain period of time, or when the disinfectant dissolved water flows backward from the dissolution cone above the ejector A mechanism to stop the supply by detection, or to detect a shortage of the disinfectant dissolved water supply amount, that is, to provide a lower limit detection mechanism for the electromagnetic flow meter, and to close the dissolved water supply valve by detecting an abnormality. It is preferable to perform control such as preventing backflow.

Various aspects of the present invention are as follows.
1. A disinfection facility having a disinfection tank for disinfecting sewage with chlorine or UV;
A bromine sewage treatment device for disinfecting sewage with a bromine-based disinfectant;
A branching device that has an inlet, an outlet 1 and an outlet 2 and divides the inflowing sewage into the outlet 1 and the outlet 2, and when the inflowing sewage amount to the inlet is less than a predetermined value, A branching device that flows to the outlet 1 and, when the inflow sewage amount is greater than or equal to a predetermined value, causes the sewage amount to flow to the outlet 1 and flows the sewage amount obtained by removing the sewage amount from the inflow sewage amount to the outlet 2; ;
Consisting of
A sewage treatment apparatus in which an outlet 1 of the branch device is connected to a sewage introduction section of the disinfection facility, and an outlet 2 of the branch apparatus is connected to a sewage introduction section of the bromine sewage treatment apparatus.
2. The sewage treatment apparatus according to claim 1, wherein the number of coliforms in the sewage is set to 3000 or less per 1 cc of sewage by a disinfection facility.
3. The sewage treatment apparatus according to claim 1, wherein the number of Escherichia coli in the sewage is reduced to 200 or less per 100 cc of sewage by a disinfection facility.
4). The sewage treatment apparatus according to claim 1, wherein an inlet of the branching device is connected to a combined sewer.
5. The sewage treatment apparatus according to claim 1, wherein the bromine sewage treatment apparatus reduces the number of coliform bacteria in the sewage to 3000 or less per 1 cc of sewage.
6). The sewage treatment apparatus according to claim 1, wherein the bromine sewage treatment apparatus reduces the number of Escherichia coli in the sewage to 200 or less per 100 cc of sewage.
7). The sewage treatment apparatus according to claim 1, wherein sewage sterilized by a disinfection facility and / or bromine sewage treatment apparatus is allowed to flow into a public water area.
8). The disinfection facility further includes an initial settling basin, wherein the introduction portion of the disinfection facility is connected to the first settling basin sewage introduction portion, and the first settling basin outlet is connected to the sterilization tank sewage introduction portion. Sewage treatment equipment as described.
9. The disinfection facility further has an initial settling basin, a flash tank, and a final settling basin. The sewage introduction section of the first sedimentation basin is connected to the introduction section of the disinfection facility, and the outlet of the first sedimentation basin is the sewage introduction section of the flash tank. The sewage treatment device according to claim 1, wherein the outlet of the final tank is connected to the sewage introduction part of the final sedimentation tank, and the outlet of the final sedimentation tank is connected to the sewage introduction part of the disinfection tank.
10. The disinfection facility
First settling basin,
A branching device that has an inlet, an outlet 1 and an outlet 2 and receives the outflow water from the first sedimentation basin at the inlet and divides it into the outlet 1 and the outlet 2, and the amount of inflow water to the branching device is below a predetermined value Is a branching device that causes the entire amount of inflow water to flow to the outlet 1, and if the inflow water amount is greater than or equal to a predetermined value, causes the predetermined amount of water to flow to the outlet 1, and flows the water amount obtained by removing the predetermined amount of water from the inflow water amount to the outlet 2 When,
A bromine sewage treatment device that disinfects sewage with a bromine-based disinfectant,
The sewage introduction part of the first sedimentation basin is connected to the introduction part of the disinfection facility, the outlet of the first sedimentation basin is connected to the inlet of the branching device, the outlet 1 of the branching device is connected to the sewage introduction part of the sterilization tank, The sewage treatment apparatus according to claim 1, wherein the outlet 2 is connected to a sewage introduction section of the bromine sewage treatment apparatus.
11. The disinfection facility
First settling basin,
The tank,
The final sedimentation basin,
A branching device that has an inlet, an outlet 1 and an outlet 2 and receives the outflow water from the first sedimentation basin at the inlet and divides it into the outlet 1 and the outlet 2, and the amount of inflow water to the branching device is below a predetermined value Is a branching device that causes the entire amount of inflow water to flow to the outlet 1, and if the inflow water amount is greater than or equal to a predetermined value, causes the predetermined amount of water to flow to the outlet 1, and flows the water amount obtained by removing the predetermined amount of water from the inflow water amount to the outlet 2 When,
A bromine sewage treatment device that disinfects sewage with a bromine-based disinfectant,
The sewage introduction part of the first sedimentation basin is connected to the introduction part of the disinfection facility, the outlet of the first sedimentation basin is connected to the entrance of the branching device, and the outlet 1 of the branching device is connected to the sewage introduction part of the tank. The outlet of the tank is connected to the sewage introduction part of the final sedimentation tank, the outlet of the final sedimentation tank is connected to the sewage introduction part of the disinfection tank, and the outlet 2 of the branching device is connected to the sewage introduction part of the bromine sewage treatment device. The sewage treatment apparatus according to claim 1.

12 A sewage treatment device in a sewage treatment plant,
First sedimentation basin;
A disinfection facility having a disinfection tank for disinfecting sewage with chlorine or UV;
A bromine sewage treatment device for disinfecting sewage with a bromine-based disinfectant;
A branching device that has an inlet, an outlet 1 and an outlet 2 and receives the outflow water from the first sedimentation basin at the inlet and divides it into the outlet 1 and the outlet 2, and the amount of inflow water to the branching device is below a predetermined value Is a branching device that causes the entire amount of inflow water to flow to the outlet 1, and if the inflow water amount is greater than or equal to a predetermined value, causes the predetermined amount of water to flow to the outlet 1, and flows the water amount obtained by removing the predetermined amount of water from the inflow water amount to the outlet 2 And consist of
A sewage treatment apparatus, characterized in that an outlet 1 of the branching apparatus is connected to a sewage introduction part of the disinfection facility, and an outlet 2 of the branching apparatus is connected to a sewage introduction part of the bromine sewage treatment apparatus.
13. A sewage treatment device in a sewage treatment plant,
First sedimentation basin;
With a tank;
The final sedimentation basin;
A disinfection facility having a disinfection tank for disinfecting sewage with chlorine or UV;
A bromine sewage treatment device for disinfecting sewage with a bromine-based disinfectant;
A branching device having an inlet, an outlet 1 and an outlet 2 that receives the effluent water from the first sedimentation basin and separates it into the outlet 1 and the outlet 2. A diverter that causes the entire amount to flow to the outlet 1, and if the inflow water amount is greater than or equal to a predetermined value, causes the predetermined amount of water to flow to the outlet 1, and removes the predetermined amount of water from the inflow water amount to the outlet 2; ,
The sewage introduction part of the first sedimentation basin is connected to the introduction part of the sewage treatment device, the outlet of the first sedimentation basin is connected to the inlet of the branching device, and the outlet 1 of the branching device is connected to the sewage introduction part of the flash tank. The outlet of the tank is connected to the sewage introduction part of the final sedimentation basin, the exit of the final sedimentation basin is connected to the sewage introduction part of the disinfection facility, and the outlet 2 of the branching device is connected to the sewage introduction part of the bromine sewage treatment device A sewage treatment apparatus characterized by that.
14 Bromine sewage treatment equipment is a storage / supply device for solid bromine-based disinfectant and a disinfectant for adding / mixing solid bromine-based disinfectant supplied from the storage / supply device for solid bromine-based disinfectant to the water to be treated The sewage treatment apparatus according to any one of claims 1 to 13, further comprising an addition / mixing apparatus.
15. A solid bromine-based disinfectant storage / supply device includes a solid bromine-based disinfectant storage tank and a quantitative feeder for measuring and discharging a predetermined amount of solid bromine-based disinfectant in the storage tank. The sewage treatment apparatus according to claim 14, wherein the machine includes a solid bromine-based disinfectant agitation unit configured with a plurality of injection ports for injecting compressed air therein.
16. The sewage treatment apparatus according to claim 15, wherein the fixed amount feeder includes a rotary table having a weighing unit.
17. The disinfectant addition / mixing device is provided with a disinfecting water preparation device that receives a part of the water to be treated and mixes / dissolves the solid bromine-based disinfectant, and means for introducing the disinfecting water into the water to be treated. 14. A sewage treatment apparatus according to 14.
18. The disinfection apparatus according to claim 17, wherein the disinfectant addition / mixing apparatus is installed in a flow path through which water to be treated flows.
19. Solid bromine-based disinfectant storage / mixing device and addition / mixing device are connected to the storage tank for storing the solid bromine-based disinfectant, and the storage tank for transferring the disinfectant as solid to the injection point The disinfectant transfer pipe connected to the disinfectant transfer pipe and the disinfectant transfer pipe, and comprising a disinfectant injection device that adds the solid bromine-based disinfectant transferred through the pipe to the water to be disinfected. Disinfection equipment.
20. The disinfecting apparatus according to claim 14, wherein the disinfectant completely dissolves from the addition position until the disinfectant reaches the discharge point of the water to be treated.
21. In addition, a preparative line for collecting a sample of the water to be treated, a disinfectant supply means for adding a disinfectant to the sampled water sample to be treated, and the effectiveness of the water sample to which the disinfectant is added. An effective halogen concentration measuring device for measuring the halogen concentration, and a disinfectant addition / mixing device according to the degree of decrease in the effective halogen concentration in the treated water sample after the addition of the disinfectant measured by the effective halogen concentration measuring device. The sewage treatment apparatus according to claim 14, further comprising a disinfectant addition amount control means for controlling an addition amount of the disinfectant added to the water to be treated.
22. Furthermore, a reducing agent supply device for adding a reducing agent to the water to be treated after adding the disinfectant, and an effective halogen concentration measuring device for measuring the effective halogen concentration in the water to be treated after adding the disinfectant are measured. The sewage treatment apparatus of Claim 14 provided with the reducing agent addition amount control apparatus which controls the addition amount of a reducing agent according to the effective halogen density | concentration in the to-be-processed water after addition of the disinfectant.
23. A method for disinfecting sewage,
Inflow sewage is sterilized by chlorine or UV when the inflow sewage amount is below a predetermined value, and when the inflow sewage amount is greater than or equal to a predetermined value, the sewage amount at a predetermined value is chlorine or UV. A sewage treatment method comprising disinfecting and simultaneously disinfecting a sewage amount obtained by subtracting a predetermined amount of sewage from an inflow sewage amount with a bromine-based disinfectant
24. The method according to claim 23, wherein the number of coliform bacteria in sewage is reduced to 3000 or less per 1 cc of sewage by disinfection with chlorine or UV.
25. The method according to claim 23, wherein the number of E. coli in sewage is reduced to 200 or less per 100 cc of sewage by disinfection with chlorine or UV.
26. The method according to claim 23, wherein the sewage to be treated is sewage from a combined sewer.
27. The method according to claim 23, wherein the number of coliforms in the sewage is reduced to 3000 or less per 1 cc of sewage by disinfection with a bromine-based disinfectant.
28. The method according to claim 23, wherein the number of Escherichia coli in sewage is reduced to 200 or less per 100 cc of sewage by disinfection with a bromine-based disinfectant.
29. The method according to claim 23, wherein sewage sterilized by chlorine or UV and / or sewage sterilized by a bromine-based disinfectant is passed to a public water area.
30. The method according to claim 23, wherein the time for disinfection treatment with a bromine-based disinfectant is 3 minutes or less.
31. The method according to claim 23, wherein the disinfection is performed by adding and mixing a solid bromine-based disinfectant to the water to be treated as a bromine-based disinfectant.
32. A request to prepare disinfecting water by mixing and dissolving a solid bromine-based disinfectant into a part of the water to be treated as a bromine-based disinfectant, and then disinfecting the prepared disinfecting water into the water to be treated Item 24. The method according to Item 23.
33. The method according to claim 23, wherein the disinfectant completely dissolves from the addition position until it reaches the discharge point of the water to be treated.
34. A portion of the water to be treated is sampled, a bromine-based disinfectant is added, and the effective halogen concentration of the sample to be treated to which the bromine-based disinfectant is added is measured. The method according to claim 23, further comprising controlling the amount of bromine-based disinfectant added to the water to be treated in accordance with the degree of reduction in the effective halogen concentration in the treated water sample.
35. Measure the effective halogen concentration in the treated water after adding the bromine-based disinfectant, and treat it after adding the bromine-based disinfectant according to the measured effective halogen concentration in the treated water after adding the disinfectant. 24. The method of claim 23, wherein a reducing agent is added to the water.
36. If the sewage system is a sewer system and does not exceed the treatment capacity of the sewage treatment plant, the sewage is treated at the sewage treatment plant and then sterilized with a chlorine-based disinfectant. If the sewage containing the amount of rainwater exceeding the capacity of the sewage treatment plant flows into the sewage treatment plant or there is a possibility that it will flow into the sewage treatment plant after a large amount of rainfall, the treatment at the sewage treatment plant For sewage mixed with rainwater exceeding the capacity, it is branched at the sewer stormwater overflow facility, disinfected with bromine-based disinfectant, discharged to public water, and rainwater within the treatment capacity of the sewage treatment plant. Contaminated sewage is treated by a sewage treatment plant, sterilized with a chlorinated disinfectant, and then discharged into public water areas. .
37. This is a sewerage sewer system, and the sewage flowing through the sewer sewage pipe is treated at the sewage treatment plant, sterilized with a chlorinated disinfectant, and then discharged into public water areas. The rainwater flowing through the dredging is discharged from a rainwater drainage facility, such as a pumping station (drainage station), into a public water area. If there is a large amount of rainfall, the rainwater drainage facility will disinfect it with a bromine-based disinfectant. A sewerage system characterized by discharge into public water areas.
38. When the amount of sewage that does not exceed the treatment capacity of the aeration tank at the sewage treatment plant flows into the sewage treatment plant, the sewage is treated by the first sedimentation tank, the aeration tank, and the final sedimentation tank. After treatment, disinfect with a chlorinated disinfectant and then release it to public waters. A large amount of rainfall will not exceed the treatment capacity of the first sedimentation basin of the sewage treatment plant, but will exceed the treatment capacity of the aeration tank. When sewage containing rainwater flows into or may flow into the sewage treatment plant, sewage mixed with rainwater exceeding the treatment capacity of the aeration tank is branched after treatment in the first sedimentation basin at the sewage treatment plant. After being disinfected with bromine-based disinfectant, it is discharged into public water areas. For sewage mixed with rainwater in the treatment capacity of the aeration tank, the treatment in the aeration tank, Performs processing by sedimentation, followed by sewer systems, characterized in that the discharged into public waters after the disinfection treatment by chlorine disinfectant.

  Examples of the present invention will be described below, but the present invention is not limited thereto. In Examples 1 to 3, wastewater was treated by the systems shown in FIGS.

Example 1
A sterilization test was conducted using treated sewage water containing coliforms as treated water. As disinfectants, 1-bromo-3-chloro-5,5-dimethylhydantoin (BCDMH) (Example 1) and sodium hypochlorite (Comparative Example 1) were used. Bactericidal tests against coliforms were performed with varying concentrations of disinfectant. Table 1 shows the quality of water to be treated and Table 2 shows the test results.

  BCDMH exhibited a bactericidal effect at a concentration of 1/2 or less compared with sodium hypochlorite, and the number of coliforms could be reduced to 3000 CFU / mL or less at an addition concentration of 1 mg / L as Cl.

  Under the condition that BCDMH was added at 1 mg / L as Cl, trihalomethane was 0.1 mg / L or less.

  In addition, as for the addition rate of the disinfectant, the bromine-based disinfectant and the chlorine-based disinfectant are expressed as active chlorine, and converted to the active chlorine concentration and displayed as “mg / L as Cl”. For example, when 1 g of BCDMH is added to 1 L of waste water, it becomes 540 mg / L as Cl.

  As for the reaction time, a sufficient effect was recognized in 1 minute with BCDMH, whereas a time of 5 minutes or more was required with sodium hypochlorite.

Example 2
After the aquatic processing wastewater was separated by flocculation, pressurization and floatation, wastewater obtained by activated sludge treatment was used as water to be treated. The disinfection agent addition density | concentration was changed with respect to this to-be-processed water, and the sterilization test was done. Table 3 shows the quality of water to be treated and Table 4 shows the test results.

  Organic nitrogen refers to the value of organic nitrogen as a whole, such as proteins, in addition to amines. For example, in the case of protein, it refers to the amount of only nitrogen atoms in the protein, and does not include the amount of carbon atoms or hydrogen atoms in the protein. Organic nitrogen does not include inorganic nitrogen such as ammonia and ammonium ions.

BCDMH produced a bactericidal effect at a concentration of 1/3 or less compared to sodium hypochlorite, and was able to reduce the number of coliforms to 3000 CFU / mL or less at an addition concentration of 2.5 mg / L as Cl.
Example 3
Wastewater was treated with the system shown in FIGS. The results are summarized in Table 5.

In RUN1 (sewage amount 120 m ³ / hour), the number of coliforms can be reduced to 3000 CFU / mL or less with a BCDMH addition amount of 12 mg / L. With RUN2 (sewage amount 250 m ³ / hour), a BCDMH addition amount of 10 mg / L is sufficient for disinfection, but the residual halogen concentration is 0.72 mg / L, which is not appropriate. A BCDMH addition amount of 5 mg / L can reduce the number of coliforms to 3000 CFU / mL or less, and the residual halogen concentration is 0.03 mg / L, which is appropriate.

RUN3 (sewage amount 530 m ³ / hour) is a case where the amount of rainfall is large, and proper disinfection was possible with a BCDMH addition amount of 3 to 4.5 mg / L. In addition, when the time which BCDMH at this time contacted rainwater exclusion sewage was calculated | required, it was about 50 second and it was able to disinfect in a very short time.

RUN4 (sewer 250 m ³ / hour) is a comparative example using sodium hypochlorite as a chlorine disinfectant. In RUN4, even if the amount of sodium hypochlorite added is 60 mg / L, the number of coliforms cannot be reduced to 3000 CFU / mL or less, and the residual halogen concentration is 1.53 mg / L and LC ₅₀ value (specifically, Is higher than 0.4 mg / L in terms of chlorine (Cl ₂ ) and is inappropriate.

  In any case of RUN1 to RUN4, the case where the disinfectant addition amount is 0 (zero) indicates the quality of the inflowing sewage that has flowed into the rainwater removal treatment plant.

Example 4
The disinfection apparatus shown in FIG. 59 was used to disinfect sewer stormwater overflow. Table 6 shows the specifications of the apparatus. Table 7 shows the quality of water to be disinfected. As a disinfectant, powdery 1-bromo-3-chloro-5,5-dimethylhydantoin (BCDMH: manufactured by Ebara Seisakusho, trade name Eva Sunny 4400) was used. Table 8 shows the results of measuring the disinfectant addition amount and the bactericidal effect on the number of coliforms of the treated water after the addition.

From this experimental result, adding the disinfectant directly to the water to be treated in the form of powder quickly reduces the number of remaining coliforms to the release regulation value of 3.0 × 10 ³ CFU / mL or less. It turns out to be effective.

Example 5
The sterilization treatment according to the method of the present invention was carried out on the rainwater overflowing water in the sewage treatment facility that created FIGS. As the disinfecting apparatus, an apparatus having the configuration shown in FIG. 44 was used. BCDMH was used as a disinfectant. While performing the disinfection treatment by introducing the disinfectant from the disinfectant introduction means 604, a sample of the liquid to be treated is collected from the sampling line 612 at a frequency of once every 10 minutes and introduced into the monitoring tank 613 to disinfect a predetermined concentration. Agent 614 was added. The concentration of the disinfectant 614 added here was the disinfectant concentration that was put into the liquid to be treated from the disinfectant introduction means 604 at that time. The concentration of the disinfectant at the start of the disinfection treatment was 5 mg / L. The residual halogen concentration in the sample of the liquid to be treated was measured 20 seconds after adding BCDMH to the sample of the liquid to be treated in the monitoring tank, and the measured value was higher than 0.2 mg / L as Cl _2. In some cases, the concentration of the disinfectant added from the disinfectant introducing means 604 was decreased, and when the measured value was lower than 0.2 mg / L as Cl ₂ , the concentration of the disinfectant added from the disinfectant introducing means 604 was increased. . Thus, disinfection treatment was continued while adjusting the disinfectant input concentration every 10 minutes, and the number of coliform bacteria in the effluent was measured every 15 minutes. The results are shown in FIG. From this result, it can be seen that the addition amount of the disinfectant changed with time, while the number of coliform bacteria in the wastewater after the treatment was maintained at the disinfection target value (3000 CFU / mL) or less.

Claims (35)

A disinfection facility having a disinfection tank for disinfecting sewage with chlorine or UV;
A bromine sewage treatment device for disinfecting sewage with bromine disinfectants;
A branching device that has an inlet, an outlet 1 and an outlet 2 and divides the inflowing sewage into the outlet 1 and the outlet 2, and when the inflowing sewage amount to the inlet is less than a predetermined value, When the amount of sewage flowing into the outlet 1 is greater than or equal to a predetermined value, a branching device that causes the amount of sewage with a predetermined value to flow into the outlet 1 and the amount of sewage obtained by removing the amount of sewage with a predetermined value from the amount of sewage into device);
Consisting of
The sewage treatment system in which the outlet 1 of the branching device is connected to the sewage introduction part of the sterilization facility and the outlet 2 of the branching device is connected to the sewage introduction part of the bromine sewage treatment device (device). Device (apparatus). The sewage treatment apparatus according to claim 1, wherein the number of coliforms in the sewage is set to 3000 or less per 1 cc of sewage by a disinfection facility. The sewage treatment apparatus according to claim 1, wherein the number of Escherichia coli in the sewage is reduced to 200 or less per 100 cc of sewage by a disinfection facility. The sewage treatment apparatus according to claim 1, wherein an inlet of the branching device is connected to a combined sewer. The sewage treatment apparatus according to claim 1, wherein the bromine sewage treatment apparatus reduces the number of coliform bacteria in the sewage to 3000 or less per 1 cc of sewage. The sewage treatment apparatus according to claim 1, wherein the bromine sewage treatment apparatus reduces the number of Escherichia coli in the sewage to 200 or less per 100 cc of sewage. The sewage treatment apparatus according to claim 1, wherein sewage sterilized by a disinfection facility and / or bromine sewage treatment apparatus is allowed to flow into a public water area. The disinfection facility further comprises an initial settling basin, the sewage introduction section of the first settling basin is connected to the introduction section of the sterilization facility, and the outlet of the first settling basin is connected to the sewage introduction section of the disinfection tank Item 2. A sewage treatment apparatus according to item 1. The disinfection facility further comprises an initial settling basin, a basin and a final basin, and the sewage introduction section of the first basin is connected to the introduction section of the sterilization facility, and the outlet of the first basin is connected to the basin tank. The sewage treatment apparatus according to claim 1, wherein the sewage treatment apparatus is connected to the sewage introduction section, the outlet of the tank is connected to the sewage introduction section of the final sedimentation tank, and the outlet of the final sedimentation tank is connected to the sewage introduction section of the disinfection tank. . Disinfection facilities
First settling basin,
A branching device that has an inlet, an outlet 1 and an outlet 2 and receives the outflow water from the first sedimentation basin at the inlet and divides it into the outlet 1 and the outlet 2, and the amount of inflow water to the branching device is below a predetermined value Is a branching device that causes the entire amount of inflow water to flow to the outlet 1, and if the inflow water amount is greater than or equal to a predetermined value, causes the predetermined amount of water to flow to the outlet 1, and flows the water amount obtained by removing the predetermined amount of water from the inflow water amount to the outlet 2 When,
A bromine sewage treatment device that disinfects sewage with a bromine-based disinfectant,
The sewage introduction part of the first sedimentation basin is connected to the introduction part of the disinfection facility, the outlet of the first sedimentation basin is connected to the inlet of the branching device, the outlet 1 of the branching device is connected to the sewage introduction part of the sterilization tank, The sewage treatment apparatus according to claim 1, wherein the outlet 2 is connected to a sewage introduction section of the bromine sewage treatment apparatus. The disinfection facility
First settling basin,
The tank,
The final sedimentation basin,
A branching device that has an inlet, an outlet 1 and an outlet 2 and receives the outflow water from the first sedimentation basin at the inlet and divides it into the outlet 1 and the outlet 2, and the amount of inflow water to the branching device is below a predetermined value Is a branching device that causes the entire amount of inflow water to flow to the outlet 1, and if the inflow water amount is greater than or equal to a predetermined value, causes the predetermined amount of water to flow to the outlet 1, and flows the water amount obtained by removing the predetermined amount of water from the inflow water amount to the outlet 2 When,
A bromine sewage treatment device for disinfecting sewage with a bromine-based disinfectant,
The sewage introduction part of the first sedimentation basin is connected to the introduction part of the disinfection facility, the outlet of the first sedimentation basin is connected to the entrance of the branching device, and the outlet 1 of the branching device is connected to the sewage introduction part of the tank. The outlet of the tank is connected to the sewage introduction part of the final sedimentation tank, the outlet of the final sedimentation tank is connected to the sewage introduction part of the disinfection tank, and the outlet 2 of the branching device is connected to the sewage introduction part of the bromine sewage treatment device. The sewage treatment apparatus according to claim 1. A sewage treatment device (apparatus) in a sewage treatment plant,
First sedimentation basin;
A disinfection equipment having a disinfection tank for disinfecting sewage with chlorine or UV;
A bromine sewage treatment device for disinfecting sewage with bromine disinfectants;
A branching device that has an inlet, an outlet 1 and an outlet 2 and receives the outflow water from the first sedimentation basin at the inlet and divides it into the outlet 1 and the outlet 2, and the amount of inflow water to the branching device is below a predetermined value Is a branching device that causes the entire amount of inflow water to flow to the outlet 1, and if the inflow water amount is greater than or equal to a predetermined value, causes the predetermined amount of water to flow to the outlet 1, and flows the water amount obtained by removing the predetermined amount of water from the inflow water amount to the outlet 2 (device);
A sewage treatment device (apparatus) characterized in that the outlet 1 of the branching device is connected to the sewage introduction part of the disinfection facility and the outlet 2 of the branching device is connected to the sewage introduction part of the bromine sewage treatment device. A sewage treatment device (apparatus) in a sewage treatment plant,
First sedimentation basin;
With a tank;
The final sedimentation basin;
A disinfection equipment having a disinfection tank for disinfecting sewage with chlorine or UV;
A bromine sewage treatment device for disinfecting sewage with bromine disinfectants;
A branching device having an inlet, an outlet 1 and an outlet 2 that receives the effluent water from the first sedimentation basin and separates it into the outlet 1 and the outlet 2. A branch device that allows the entire amount to flow to the outlet 1, and if the inflow water amount is greater than or equal to a predetermined value, the predetermined amount of water flows to the outlet 1, and the water amount obtained by removing the predetermined amount of water from the inflow water amount to the outlet 2 Consisting of
The sewage introduction part of the first sedimentation basin is connected to the introduction part of the sewage treatment device, the outlet of the first sedimentation basin is connected to the inlet of the branching device, and the outlet 1 of the branching device is connected to the sewage introduction part of the flash tank. The outlet of the tank is connected to the sewage introduction part of the final sedimentation basin, the exit of the final sedimentation basin is connected to the sewage introduction part of the disinfection facility, and the outlet 2 of the branching device is connected to the sewage introduction part of the bromine sewage treatment device A sewage treatment apparatus characterized by that. Bromine sewage treatment equipment is a storage / supply device for solid bromine-based disinfectant and a disinfectant for adding / mixing solid bromine-based disinfectant supplied from the storage / supply device for solid bromine-based disinfectant to the water to be treated The sewage treatment apparatus according to any one of claims 1 to 13, further comprising an addition / mixing apparatus. A solid bromine-based disinfectant storage / supply device includes a solid bromine-based disinfectant storage tank and a quantitative feeder for measuring and discharging a predetermined amount of solid bromine-based disinfectant in the storage tank. The sewage treatment apparatus according to claim 14, wherein the machine includes a solid bromine-based disinfectant agitation unit configured with a plurality of injection ports for injecting compressed air therein. The sewage treatment apparatus according to claim 15, wherein the fixed amount feeder includes a rotary table having a weighing unit. The disinfectant addition / mixing device is provided with a disinfecting water preparation device that receives a part of the water to be treated and mixes / dissolves the solid bromine-based disinfectant, and means for introducing the disinfecting water into the water to be treated. 14. A sewage treatment apparatus according to 14. The disinfection apparatus according to claim 17, wherein the disinfectant addition / mixing apparatus is installed in a flow path through which water to be treated flows. Solid bromine-based disinfectant storage / mixing device and addition / mixing device are connected to the storage tank for storing the solid bromine-based disinfectant, and the storage tank for transferring the disinfectant as solid to the injection point The disinfectant transfer pipe connected to the disinfectant transfer pipe and the disinfectant transfer pipe, and comprising a disinfectant injection device that adds the solid bromine-based disinfectant transferred through the pipe to the water to be disinfected. Disinfection equipment. The disinfecting apparatus according to claim 14, wherein the disinfectant completely dissolves from the addition position until the disinfectant reaches the discharge point of the water to be treated. In addition, a preparative line for collecting a sample of the water to be treated, a disinfectant supply means for adding a disinfectant to the sampled water sample to be treated, and the effectiveness of the water sample to which the disinfectant is added. An effective halogen concentration measuring device for measuring the halogen concentration, and a disinfectant addition / mixing device according to the degree of decrease in the effective halogen concentration in the treated water sample after the addition of the disinfectant measured by the effective halogen concentration measuring device. The sewage treatment apparatus according to claim 14, further comprising a disinfectant addition amount control means for controlling an addition amount of the disinfectant added to the water to be treated. Furthermore, a reducing agent supply device for adding a reducing agent to the water to be treated after adding the disinfectant, and an effective halogen concentration measuring device for measuring the effective halogen concentration in the water to be treated after adding the disinfectant are measured. The sewage treatment apparatus of Claim 14 provided with the reducing agent addition amount control apparatus which controls the addition amount of a reducing agent according to the effective halogen density | concentration in the to-be-processed water after addition of the disinfectant. A method for disinfecting sewage,
Inflow sewage is sterilized by chlorine or UV when the inflow sewage amount is below a predetermined value, and when the inflow sewage amount is greater than or equal to a predetermined value, the sewage amount at a predetermined value is chlorine or UV. A sewage treatment method comprising disinfecting and simultaneously disinfecting a sewage amount obtained by subtracting a predetermined amount of sewage from an inflow sewage amount with a bromine-based disinfectant The method according to claim 23, wherein the number of coliform bacteria in sewage is reduced to 3000 or less per 1 cc of sewage by disinfection with chlorine or UV. The method according to claim 23, wherein the number of E. coli in sewage is reduced to 200 or less per 100 cc of sewage by disinfection with chlorine or UV. The method according to claim 23, wherein the sewage to be treated is sewage from a combined sewer. The method according to claim 23, wherein the number of coliforms in the sewage is reduced to 3000 or less per 1 cc of sewage by disinfection with a bromine-based disinfectant. The method according to claim 23, wherein the number of Escherichia coli in sewage is reduced to 200 or less per 100 cc of sewage by disinfection with a bromine-based disinfectant. The method according to claim 23, wherein sewage sterilized by chlorine or UV and / or sewage sterilized by a bromine-based disinfectant is passed to a public water area. The method according to claim 23, wherein the time for disinfection treatment with a bromine-based disinfectant is 3 minutes or less. The method according to claim 23, wherein the disinfection is performed by adding and mixing a solid bromine-based disinfectant to the water to be treated as a bromine-based disinfectant. A request to prepare disinfecting water by mixing and dissolving a solid bromine-based disinfectant into a part of the water to be treated as a bromine-based disinfectant, and then disinfecting the prepared disinfecting water into the water to be treated Item 24. The method according to Item 23. The method according to claim 23, wherein the disinfectant completely dissolves from the addition position until it reaches the discharge point of the water to be treated. A portion of the water to be treated is sampled, a bromine-based disinfectant is added, and the effective halogen concentration of the sample to be treated to which the bromine-based disinfectant is added is measured. The method according to claim 23, further comprising controlling the amount of bromine-based disinfectant added to the water to be treated in accordance with the degree of reduction in the effective halogen concentration in the treated water sample. Measure the effective halogen concentration in the treated water after adding the bromine-based disinfectant, and treat it after adding the bromine-based disinfectant according to the measured effective halogen concentration in the treated water after adding the disinfectant. 24. The method of claim 23, wherein a reducing agent is added to the water.

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