WO2006054373A1

WO2006054373A1 - Sewage treatment plant and method

Info

Publication number: WO2006054373A1
Application number: PCT/JP2005/009959
Authority: WO
Inventors: Sakae Kosanda; Yuichi Fuchu; Norio Makita; Yoshiharu Yasuhara; Hideyuki Yoshida; Shojiro Watanabe
Original assignee: Ebara Corporation
Priority date: 2004-11-19
Filing date: 2005-05-31
Publication date: 2006-05-26
Also published as: JPWO2006054373A1; WO2006054351A1

Abstract

A sewer system including means for rapidly disinfecting pollutant-mixed rainwater and rainwater-mixed sewage discharged without passage through sewage treatment facilities in the event of heavy rainfall, namely, combined sewer overflow (CSO), sanitary sewer rainwater overflow, sanitary sewer sewage overflow, etc. prior to discharge into public waters; and a relevant method and plant for disinfection of rainwater-mixed sewage and pollutant-mixed rainwater. There is provided a sewer system characterized in that when the amount of influx sewage is ≤ given value, the whole amount of influx sewage is disinfected by chlorine or UV, while when the amount of influx sewage is ≥ given value, sewage as much as the given value is disinfected by chlorine or UV and simultaneously the sewage amounting to the influx sewage amount minus the given value of sewage amount is branched and disinfected by a bromic disinfectant.

Description

Specification

Sewage treatment apparatus and method

Technical field

[0001] The present invention relates to a method and apparatus for disinfecting drainage, in particular, sewage diluted with rainwater, specifically combined sewer stormwater overflow, diverted sewer stormwater overflow. The present invention relates to a method and apparatus for disinfecting running water or diversion sewer sewage overflow water, and a sewer system equipped with a powerful disinfection apparatus.

Background art

[0002] In urban areas, domestic sewage and industrial wastewater are sent to sewage treatment plants by combined sewers or shunt sewers, and sand basins and suspended solids (suspended solids) are used to remove sand. solid-liquid separation treatment to remove soli d; SS), activated sludge treatment, and then disinfection in this order and then released into public water such as rivers, lakes, harbors, coastal waters, etc. Yes.

[0003] In general, disinfection is generally performed using chlorine gas or a chlorine-based disinfectant. Sewage, human waste, industrial wastewater, etc., may contain pathogens that can cause infections. In general, chlorine-based disinfectants are added to keep the number of coliforms per lm (the number of E. coli) below 3000 (CFU / mL). In some cases, ultraviolet irradiation or ozone addition may be performed without adding a chlorine-based disinfectant, but the use is limited due to the huge amount of equipment.

[0004] However, during heavy rain, due to problems with the treatment capacity of the sewage treatment plant, various treatments and disinfection have not been performed at the sewage treatment plant! There will be a situation where rainwater mixed with things must be discharged into public waters. It is important to sterilize sewage mixed with rainwater and polluted rainwater that is discharged into public waters during this rainy season before it is discharged into public waters.

Disclosure of the invention

[0005] The present invention relates to rainwater-mixed sewage or pollutant-mixed stormwater that is discharged without passing through a sewage treatment plant during a large amount of rain, or is not subjected to biological treatment and disinfection treatment in a sewage treatment plant! Quickly discharge simple discharged water mixed with discharged rainwater before it is discharged into public water bodies. Provided are a sewer system provided with means for poisoning, and a method and apparatus for disinfecting sewage mixed with rainwater or rainwater mixed with pollutants.

Brief Description of Drawings

FIG. 1 is a flowchart showing a typical configuration example of a combined sewer.

FIG. 2 is a flowchart showing a typical configuration example of a shunt sewer.

FIG. 3 is a flowchart showing a typical configuration example of a sewage treatment plant.

FIG. 4 is a diagram showing a configuration example of a sewage treatment apparatus that works on one embodiment of the present invention.

FIG. 5 is a diagram showing a configuration example of a sewage treatment apparatus according to one embodiment of the present invention.

FIG. 6 is a diagram showing a configuration example of a sewage treatment apparatus according to one embodiment of the present invention.

FIG. 7 is a diagram showing a configuration example of a sewage treatment apparatus according to one embodiment of the present invention.

FIG. 8 is a diagram showing an example of the configuration of a sewage treatment apparatus according to one embodiment of the present invention.

FIG. 9 is a schematic explanatory diagram illustrating a disinfection device according to an embodiment of the present invention.

FIG. 10 is a schematic explanatory view illustrating one embodiment of the present invention in which a disinfectant is introduced into a sand basin.

FIG. 11 is a schematic explanatory view showing another embodiment of the present invention.

FIG. 12 is a schematic explanatory view showing one embodiment of an adding device for adding disinfecting water to sewer overflow water in rainy weather.

FIG. 13 is a schematic explanatory diagram showing another embodiment that can be adopted as a disinfectant storage / supply device.

FIG. 14 is a diagram showing a specific configuration example of a solid disinfectant storage unit.

FIG. 15 is a view showing an embodiment of a solid disinfectant storage tank.

FIG. 16 is a diagram showing an embodiment of a solid disinfectant storage tank.

FIG. 17 is a diagram showing an embodiment of a metering feeder.

FIG. 18 is a view showing an embodiment of a metering feeder.

FIG. 19 is a view showing a form in which a container is connected to a solid disinfectant storage tank.

FIG. 20 is a diagram illustrating a configuration example of a solid disinfectant container.

FIG. 21 is a diagram illustrating an example of an installation form of a solid disinfectant supply facility.

FIG. 22 is a diagram for explaining another form of a container containing a solid disinfectant.

FIG. 23 is a diagram showing another configuration example of a dissolving unit that dissolves a solid disinfectant in water to form disinfecting water. It is.

FIG. 24 is a diagram showing another form of solid bromine-based disinfectant storage / supply device that can be used in the present invention.

FIG. 25 is a diagram showing another form of solid bromine-based disinfectant storage and supply device that can be used in the present invention.

[26] Fig. 26 is a diagram showing another example of a solid bromine-based disinfectant storage / supply device using a single screw screw pump for fluid / powder transfer.

[27] Fig. 27 is a diagram showing a specific example of a disinfecting apparatus according to one aspect of the present invention in which solid bromine-based disinfectant is put into a sewer stormwater overflow to be treated in a solid state.

圆 28] It is a figure which shows one form of disinfectant injection apparatus.

[29] FIG. 29 is a view showing another embodiment of the disinfectant injection device.

FIG. 30 is a view showing another embodiment of the disinfectant injection device.

[31] This is a graph showing the time course of the undissolved disinfectant residual rate, residual halogen concentration, and number of coliform bacteria after a solid disinfectant was added to sewer stormwater overflow.

[32] FIG. 32 is a view showing a concept of a disinfection device for sewer overflow water in rainy weather according to another embodiment of the present invention.

FIG. 33 is a diagram showing a form in which the shape of the flow path of sewer stormwater overflow after the addition of the disinfectant is changed.

FIG. 34 is a view showing another embodiment in which the shape of the channel 507 of sewer stormwater overflow after the addition of the disinfectant is changed.

FIG. 35 is a view showing another embodiment in which the shape of the channel 507 of sewer stormwater overflow after the addition of the disinfectant is changed.

FIG. 36 is a diagram showing a concept of one embodiment of a disinfecting apparatus for injecting a solid disinfectant into sewer stormwater overflow to be treated.

[37] FIG. 37 is a diagram showing another configuration example of a disinfecting apparatus that disinfects a solid bromine-based disinfectant as it is in a solid wastewater sewer stormwater overflow.

[38] FIG. 38 is a diagram showing another configuration example of a disinfecting apparatus that disinfects solid bromine-based disinfectant as it is into solid sewer overflow water to be treated. FIG. 39 is a graph showing the relationship between the elapsed time after rainfall and the number of coliform bacteria after disinfection when a predetermined amount of halogen-based disinfectant was added to rainwater overflow in a sewage treatment facility.

[Figure 40] Graph showing the number of coliform bacteria after disinfection when various concentrations of halogen-based disinfectant are added to sewage in the rain after 0.5 hours (point A in Figure 39) It is.

[Fig.41] A graph showing the number of coliforms after disinfection when various concentrations of a halogen-based disinfectant are added to sewage during rainy weather after 45 minutes (point B in Fig. 39). is there.

[Fig.42] A graph showing the number of coliform bacteria after disinfection when various concentrations of halogenated disinfectant are added to sewage in the rain after 5 hours (point C in Fig. 39) after rain It is.

FIG. 43 is a graph showing the relationship between the elapsed time after adding a disinfectant and the residual halogen concentration in the liquid to be treated when a halogen-based disinfectant is added to rainwater overflow at various elapsed times after rainfall. It is.

[FIG. 44] A diagram showing an example of the configuration of a disinfection device for sewer stormwater overflow according to one embodiment of the present invention.

FIG. 45 is a diagram illustrating an embodiment of the present invention in which a reducing agent is added to sewer stormwater overflow to which a disinfectant is added.

圆 46] It is a diagram showing the sewer network that collects the wastewater disinfected by the disinfection device and the treatment area.圆 47] It is a diagram showing the sewer network that collects the wastewater to be disinfected by the disinfection device, the treatment area and the adjacent treatment area.

[FIG. 48] A diagram showing a configuration example of a control device of a sewer stormwater overflow disinfecting device according to the present invention.

圆 49] This figure shows the mapping process used in the control method of the sewer stormwater overflow disinfection device according to the present invention, where (a) is measured in each treatment area A, B, C, D, E, X This is a schematic diagram mapping the rainfall information. Fig. (B) is a schematic diagram after time t in Fig. (A).

FIG. 50 is a diagram showing another configuration example of the control device of the sewer overflow water disinfection device in the rain according to the present invention.

[51] FIG. 51 is a diagram showing another configuration example of the control device for the sewer stormwater overflow disinfecting device according to the present invention. FIG. 52 is a system diagram showing a state in which disinfection is executed by an embodiment of a wastewater disinfection apparatus having an abnormality detection mechanism according to the present invention.

FIG. 53 is a diagram showing a processing procedure for detecting an excess and an excess of the amount of drug added.

FIG. 54 is a diagram showing a processing procedure for detecting an excess or an excess of a drug addition amount.

FIG. 55 is a diagram showing a processing procedure for detecting an excessive amount of drug addition.

FIG. 56 is a diagram showing a concept of a control device that detects an abnormal supply of a solid disinfectant and stops the supply.

FIG. 57 is a diagram for explaining an embodiment of a method of operating an apparatus for disinfecting sewer stormwater overflow with a solid bromine-based disinfectant according to the present invention.

FIG. 58 is a conceptual diagram showing an example of a control system of a sewage overflow water disinfection system that is useful in the present invention.

FIG. 59 is a diagram showing a configuration of a disinfection device for sewer stormwater overflow used in Example 4.

FIG. 60 is a graph showing the results of Example 5.

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

[0008] In FIG. 48, 710 is a treatment plant, 720 is rainfall information measuring means, 721a is rainfall information of processing area A, 722a is rainfall information of processing area A, 730 is a control device, and 731 is rainfall information mapping processing means. 732: Rainfall information estimation processing means, 733: Expected rainfall, 734: Expected rainfall intensity, 735: Expected inflow, 736: E. coli group number estimation processing means, 737: Predicted value Z Actual value correction processing means, 741: Drug Addition amount, 742 is chemical consumption, 743 is drainage disinfection start time, 750 is turbidity measurement means, 751 is influent turbidity, 752 is actual value measurement method, 753 is rainfall, 754 is rainfall intensity 755 is the influent water volume, 756 is the chemical supply volume, and 757 is the residual chemical concentration in the discharged water.

[0009] In FIG. 50, 710 is a treatment plant, 720 is rainfall information measuring means, 721x is rainfall information of processing area X, 722x is rainfall information of processing area X, 730 is a control device, and 731 is rainfall information mapping processing means. 732 is the rainfall information estimation processing means, 733 is the predicted rainfall, 734 is the predicted rainfall intensity, 735 is the expected inflow, 736 is the coliform group number estimation processing means, 737 is the predicted value Z actual value correction processing means, 737a to 737c Is the correction value addition processing means, 741 is the amount of chemical added, 742 is the amount of chemical consumption, 743 is the start time of the drainage disinfection device, 750 is the turbidity measuring means, 75 1 is influent water turbidity, 752 is measured value measurement means, 753 is rainfall, 754 is rainfall intensity, 755 is inflow water quantity, 756 is chemical supply quantity, 757 is residual water residual chemical concentration, 760 is regional characteristic simulation means 761 is the expected inflow water volume and 762 is the expected inflow pollution load.

[0010] In FIG. 51, 710 is a treatment plant, 720 is rainfall information measuring means, 721x is rainfall information of processing region X, 722x is rainfall information of processing region X, 730 is a control device, and 737 is a predicted value Z 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 amount, 752 is a measured value measurement means 753, rainfall, 754, rainfall intensity, 755, inflow, 756, drug supply, 757, residual chemical concentration, 760, regional characteristics simulation means, 761, expected inflow, 762, expected inflow It is a pollution load.

[0011] Fig. 52 [Koo! /, 810ί or 810ai or 810ai or 810ai or 810bi or 810bi or 811 or 812, a river, 813 or 814 Mouth monitoring camera, 820 screen, 821 raw water flow meter, 830 disinfectant addition device, 831 hocno 832 disinfectant, 833 feeder, 834 ejector, 835 hopper weight, 836 rotation speed 840 is a dissolution apparatus, 841 is a dissolution tank, 842 is a stirrer, 843 is a dissolution tank residual halogen concentration meter, and XI is a hopper weigh scale.

[0012] In Fig. 53, 813 is a residual halogen concentration meter for discharged water, 843 is a residual halogen concentration meter for dissolution tank, 870 is a high-level residual halogen determination output, 871 is a low-level residual halogen output, and 901 is a residual water residual halogen. Concentration high level threshold, 902 is dissolution tank residual halogen concentration low level threshold, 903 is dissolution tank residual halogen concentration high level threshold, 904 is residual halogen concentration difference (disinfectant consumption) low threshold! , Value.

[0013] In FIG. 54, 835 is a hopper weigh scale, 836 is the number of revolutions of the feeder, 881 is an output of excessive determination of the amount of added drug, 883 is an output of excess determination of the amount of added drug, and 910 is the number of revolutions of the supply machine → discharge amount The conversion coefficient, 911 is a medicine discharge amount addition amount low level threshold, 912 is a medicine discharge amount addition amount high level threshold, and 913 is a medicine discharge amount determination processing sampling period.

[0014] In FIG. 55, 814 is a discharge port monitoring camera, 890 is a fish abnormality judgment output, 921 is a fish judgment pattern, 922 is a fish drift judgment movement range coordinate 1, 923 is a fish drift judgment movement range coordinate 2, 924 is the fish drift detection time, 925 is the drift fish population high level threshold It is.

In FIG. 59, 551 is a disinfectant storage tank, 552 is a disinfectant metering means, 553 is a disinfectant transfer pipe, 554 is a disinfectant mixing means, 555 is a dry air supply means, 556 is a dust removing means, and 55 7 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

[0016] "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 treatment includes removal of suspended solids in the first sedimentation basin, biological treatment in the aeration tank, sludge removal in the final sedimentation basin, and disinfection with a chlorinated disinfectant. Figure 1 shows a typical configuration example of a combined sewer system. 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, where they are subjected to precipitation treatment, aeration (biological reaction) treatment, final precipitation treatment, disinfection treatment, and other public water areas. To be released. Public waters include rivers, lakes, harbors, coastal waters, and so on. However, if there is a lot of rainfall, there is a risk that sewage mixed with rainwater will exceed the amount that can be treated at the sewage treatment plant. For this reason, facilities for draining sewage mixed with rainwater, such as a rainwater discharge chamber and a pumping station (drainage station), are installed in the middle of the sewer pipe. In the rainwater discharge chamber, in some cases, a filtration screen is installed to remove foreign substances, and then overflow water is discharged. In addition, a sedimentation basin is usually installed at the pumping station, and the drained sewage mixed with stormwater is discharged after being simply treated by the sedimentation basin. Such sewage sewage discharge in rainy weather is generally called combined sewer overflow (CSO).

[0017] On the other hand, “separated sewer” means collecting domestic sewage and industrial wastewater and rainwater in separate pipes, sending domestic sewage and industrial wastewater to sewage treatment plants, and making rainwater public. It is a method of discharging into the water area. Figure 2 shows a typical configuration example of a diversion sewer system. Sewage discharged from sewage discharge sources such as general households and factories is collected in sewage pipes of the sewerage sewer system, sent to the sewage treatment plant, and discharged into public water bodies through the prescribed treatment. On the other hand, rainwater is collected in the sewer pipe of the sewerage sewer through the rainwater ditch, etc. Pump station (drainage station) force installed at multiple locations Discharged to public water areas. In such a sewer system, the sewer stormwater overflow that is discharged from the pumping station of the storm water pipeline should originally contain only rainwater. However, in reality, when a large amount of rain falls, a large amount of rainwater flows through the sewer. At this time, contaminants present on the ground surface such as roads and sludge accumulated in the sewer are also present. Will be washed away. Therefore, stormwater overflows in diverted sewers may contain E. coli caused by contaminants and sludge on the ground surface.

[0018] Even in the case of stormwater overflow of the combined sewer and sewer sewage mentioned above! /, Even if there is a deviation, the number of coliforms in the overflow will exceed the discharge limit (3000 CFU / mL or less) It is desirable to disinfect. Here, CFU means colony forming unit, s.

[0019] Fig. 3 shows a typical configuration example of a sewage treatment plant. The sewage sent from the sewer pipe is introduced into the sewage treatment plant by the pump, and treated in the first sedimentation basin (primary sedimentation basin), and impurities and suspended solids are removed by sedimentation. Next, after biological treatment in the aeration tank, sedimentation is performed in the final sedimentation tank to separate the sludge, and the treated water is then disinfected in the disinfection tank (chlorine mixing tank). The treated water may be disinfected by UV irradiation instead of or in combination with a chlorine mixing tank. After this series of treatments, it is discharged into public water as treated sewage. However, in the case of a combined sewerage system, rainwater and sewage flow together in the sewer pipe, so that when there is a large amount of rain, an amount of rainwater-mixed sewage that exceeds the treatment capacity of the sewage treatment plant flows. May come. In this case, some sewage may be discharged into the public water area at the pumping pump station. Also, 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, when 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 introduced before introducing it into the aeration tank. Elimination and simple treatment in disinfection tanks (chlorine mixing tank and Z or UV irradiation tank) may be released into public waters. Also, depending on the sewage treatment plant, there is no space to install a disinfecting tank for this discharged water. In such a case, it may be discharged into public water bodies without being treated. The sewage discharged from the sewage treatment plant is also a combined sewer. It is called combined sewer overflow (CSO), and its disinfection treatment is an important issue.

[0020] In addition, the sewage pipe of the sewerage sewer system should originally flow only sewage, and the amount of sewage flowing through the sewage pipe does not increase even during heavy rainfall. However, in reality, a considerable amount of unknown water has entered the sewer pipes of the diversion sewer, and there is sewage that overflows from the sewer pipes and is discharged into the public water area. This is called sanitary sewer overflow (SSO) in a sewer system, and its disinfection is an important issue.

[0021] One aspect of the present invention is a means for quickly disinfecting these combined sewer sewage overflow, split sewer stormwater overflow, and split sewer sewage overflow (disinfection according to the present invention shown in FIGS. 1 to 3). A sewer system provided with a device).

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 in fine weather or a small amount of rain, the sewage is passed to the sewage treatment plant. After the prescribed treatment of the first sedimentation basin, aeration tank, final sedimentation basin, etc., sterilization by chlorinated disinfectant and sterilization treatment by Z or UV irradiation, and then discharge to public water area due to heavy rainfall When sewage containing rainwater exceeding the treatment capacity of the sewage treatment plant flows into or may flow into the sewage treatment plant, sewage pipes that contain storm water that exceeds the treatment capacity of the sewage treatment plant Sewage overflow drainage facilities during rainy days on roads, such as rainwater spout rooms, pumping stations (drainage station), or pumping pumping stations of sewage treatment plants, and after disinfecting with bromine-based disinfectants, discharge into public water bodies Sewage treatment After the prescribed treatment of the first sedimentation basin, aeration tank, final sedimentation basin, etc., the chlorinated disinfectant and Z Or a sewage system is provided, which is characterized by being discharged into public water after being disinfected by UV irradiation.

[0023] Further, according to another aspect of the present invention, the sewage that flows through the sewer pipe of the sewer system, such as a first sedimentation basin, an aeration tank, and a final sedimentation basin, is treated in the sewerage treatment plant. For storm water that flows through public sewers and drains through sewer pipes after sterilization with chlorinated disinfectant and Z or UV irradiation after prescribed treatment. When it is discharged from a rainwater drainage facility, such as a pumping station (drainage station), into a public water area. A sewage system is provided, which is characterized by being discharged into public water after being disinfected with bromine-based disinfectant at the exclusion facility.

[0024] Further, according to another aspect of the present invention, when the amount of sewage flows into the sewage treatment plant in a fine weather or a small amount of rain, the amount of sewage does not exceed the treatment capacity of the aeration tank of the sewage treatment plant. Sewage is discharged into the public water area after sewage treatment at the sewage treatment plant, after the prescribed treatment such as the first settling basin, aeration tank, and final settling basin, and then disinfecting with chlorinated disinfectant and Z or UV irradiation. If there is a possibility that sewage containing the amount of rainwater exceeding the treatment capacity of the aeration tank will flow into or may flow into the sewage treatment plant due to a large amount of rainfall. For sewage mixed with rainwater that exceeds the treatment capacity of the aeration tank, it is branched after treatment in the first sedimentation basin at the sewage treatment plant, disinfected with a bromine-based disinfectant, and then discharged into public water areas. Rainwater mixed within the processing capacity of For incoming sewage, following the treatment in the first sedimentation basin at the sewage treatment plant, prescribed treatments such as an aeration tank and final sedimentation basin are performed, followed by sterilization treatment by chlorinated disinfectant and Z or UV irradiation. After that, a sewer system is provided, which is characterized by being discharged into public water areas.

[0025] Further, another aspect of the present invention provides an apparatus for disinfecting the above-mentioned combined sewer overflow, split sewer stormwater overflow or split sewer sewage overflow water. In one aspect, such an apparatus includes a storage / supply device for a solid bromine-based disinfectant, and a storage / supply device power for the solid bromine-based disinfectant. It is equipped with a disinfectant addition / mixing device that is added to and mixed with sewer stormwater overflow and sewer sewage overflow.

[0026] As described above, the treated water targeted by the present invention is discharged into a public water area without proper treatment in a sewage treatment plant when a large amount of rain occurs in a combined sewer. In sewage mixed with rainwater, that is, combined sewer stormwater overflow (CSO) and diversion sewers, rainwater containing pollutants released from rainwater pipes to public water areas during rainfall In sewerage sewer stormwater overflow and diversion sewerage, sewage containing unknown water discharged from sewage pipes to public water areas, that is, sewer sewer sewage overflow (SSO) can be mentioned. In the following description, these combined sewer overflow, split sewer stormwater overflow or split sewer sewage overflow is 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.

[0027] The concept of the present invention described above can also be defined as shown in FIG. In Figure 4, sewage flows into the branching device. If the inflow sewage is less than the specified value, the inflow sewage flows out from the outlet 1, and the sewage outflow from the outlet 1 is sent to a disinfection facility having a disinfection tank that is disinfected with chlorine or UV for disinfection. Disinfected sewage can be discharged into public water areas. In addition, 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 the predetermined value flows out from the outlet 1 and is treated in the same manner as described above. Inflow Sewage capacity The amount of sewage, excluding the specified amount of sewage, flows out of the outlet 2 and is sent to a bromine sewage disinfection device that disinfects the sewage with a bromine-based disinfectant. Sewage that has been disinfected by bromine sewage disinfection equipment can also be discharged into public waters. The predetermined value here is, for example, the treatment capacity of the sewage treatment plant, or the treatment capacity of the aeration tub when it is branched between the first sedimentation basin and the aeration tub in the sewage treatment plant as shown in FIG. Point to.

[0028] That is, another aspect of the present invention provides:

A disinfection facility with a disinfection tank that disinfects 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, outlet 1 and outlet 2 and divides the sewage flowing into the inlet into outlet 1 and outlet 2.If the amount of sewage flowing into the inlet is below a predetermined value, the total amount of sewage flowing in When the inflow sewage amount is greater than or equal to the predetermined value, the sewage amount is discharged to the outlet 1, and the sewage amount obtained by removing the predetermined amount of sewage from the inflow sewage amount is discharged to the outlet 2. And consisting of

The outlet 1 of the branch device is connected to the sewage introduction section of the disinfection facility, and the branch device The sewage treatment equipment is connected to the sewage introduction section of the bromine sewage treatment equipment.

[0029] In the above aspect, when the inflow sewage amount is equal to or greater than the predetermined value, the sewage amount obtained by subtracting the sewage amount of the predetermined value from the inflow sewage amount (the sewage amount flowing out from the outlet 2 of the branching device) is described above. It can be thought of as the concept of sewer stormwater overflow.

[0030] As the disinfection facility, for example, a sewage treatment plant can be exemplified. As shown in Fig. 5, the disinfection facility further has 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. Can be done. Furthermore, as shown in Fig. 6, the disinfection facility further has an initial settling basin, a batting tank, and a final settling basin, and the sewage introduction section of the first settling basin is connected to the introduction section of the disinfection facility, and the first settling basin The outlet of the basin tank is connected to the sewage introduction part of the basin tank, the outlet of the basin tank is connected to the sewage introduction part of the final sedimentation tank, and the exit of the final sedimentation tank is connected to the sewage introduction part of the disinfection tank Say it with a word.

[0031] Further, a branching device and a bromine disinfection device are also arranged in the disinfection facility, and when inflow water exceeding a predetermined value flows, the excess is branched and disinfected by the bromine disinfection device. it can. That is, 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 receives the effluent water from the first settling basin at the inlet to the outlet 1 and the outlet 2. When the amount of water flowing into the branching device is less than the predetermined value, the entire amount of the inflowing water flows to the outlet 1, and when the amount of inflowing water is greater than the predetermined value, the predetermined amount of water is discharged to the outlet 1. A branching device that flows the amount of water excluding the specified amount of water to the outlet 2 and a bromine sewage treatment device that disinfects sewage with a bromine-based disinfectant, and first settles at the introduction part of the disinfection facility. The sewage inlet of the pond is connected, 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 inlet of the disinfection tank, and the outlet 2 of the branching device is connected to the bromine sewage treatment device. The present invention relates to the sewage treatment apparatus described above connected to the sewage introduction section. Fig. 7 shows an example of a configuration that can be used. Furthermore, in another aspect of the present invention, the disinfection facility further includes an initial settling basin, a flaking tank, a final settling basin, an inlet and an outlet 1 and an outlet 2, and the effluent from the first basin. Is a branching device that accepts the water at the inlet and separates it into outlet 1 and outlet 2. A branching device that flows the entire amount of water to outlet 1 and flows the predetermined amount of water to outlet 1 when the amount of influent water is greater than or equal to the predetermined value, and flows the amount of water excluding the predetermined amount of water to outlet 2 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, and the outlet of the first sedimentation basin is connected to the branch device Connected to the inlet, outlet 1 of the branching device is connected to the sewage introduction section of the batting tank, the outlet of the batting tank is connected to the sewage introduction section of the final sedimentation tank, and the outlet of the final sedimentation tank is introduced to the sewage of the disinfection tank The sewage treatment device according to the above, wherein the outlet 2 of the branch device is connected to the sewage introduction unit of the bromine sewage treatment device. Fig. 8 shows a configuration example of a powerful form

Furthermore, a configuration in which the apparatus including the branch device and the bromine sewage disinfection device shown in FIG. 7 or FIG. 8 is disposed 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 branching device that has an inlet, outlet 1 and outlet 2 and receives the effluent water from the first sedimentation basin at the inlet and divides it into outlet 1 and outlet 2, and the amount of water flowing into the branching device is below a predetermined value. The total amount of influent water flows to outlet 1, and when the amount of influent water is greater than or equal to a predetermined value, the predetermined amount of water flows to outlet 1, and the amount of inflow water volume excluding the predetermined amount of water flows to outlet 2. Equipment; and power,

The present invention relates to a sewage treatment apparatus characterized in that outlet 1 of the branching device is connected to the sewage introduction part of the disinfection facility, and outlet 2 of the branching apparatus is connected to the sewage introduction part of the sewage treatment apparatus.

[0033] Still another aspect of the present invention is a sewage treatment apparatus in a sewage treatment plant,

First sedimentation basin;

Batsukiro;

The final sedimentation basin;

A disinfection facility having a disinfection tank for disinfecting sewage with chlorine or UV; A bromine sewage treatment device that disinfects sewage with a bromine-based disinfectant; a branching device that has an inlet, an outlet 1 and an outlet 2 and receives the effluent from the first sedimentation basin at the inlet and divides it into outlet 1 and outlet 2 If the inflow water volume is less than or equal to the predetermined value, the entire inflow water volume flows to the outlet 1, and if the inflow water volume is greater than or equal to the predetermined value, the predetermined amount of water flows to the outlet 1, and the inflow water volume force And a branching device that drains the amount of water to 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 entrance of the branching device, and the outlet 1 of the branching device is connected to the sewage introduction part of the flapping tank. The outlet of the batting 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 the sewage introduction part of the bromine sewage treatment device. It is related with the sewage treatment apparatus characterized by being connected to.

In the sewage treatment apparatus described above, the number of coliforms in sewage can be reduced to 3000 or less per lcc of sewage by disinfection facilities. In addition, disinfection facilities can reduce the number of E. coli in sewage to 200 or less per sewage lOOcc. Furthermore, the entrance of the branching device can be connected to a combined sewer. Bromine sewage treatment equipment can reduce the number of coliforms in sewage to 3000 or less per lcc of sewage. Furthermore, the bromine sewage treatment equipment can reduce the number of E. coli in sewage to 200 or less per sewage lOOcc. Sewage sterilized by disinfection facilities and Z or bromine sewage treatment equipment can be discharged into public water bodies. Further, in the sewage treatment apparatus specified above, the bromine sewage treatment apparatus includes a solid bromine-based disinfectant storage and supply device and a solid bromine-based disinfectant storage and supply device. A disinfectant addition “mixing device” for adding and mixing the system disinfectant to the water to be treated can be provided. The storage and supply device for the solid bromine-based disinfectant includes a storage tank for the solid bromine-based disinfectant and a metering feeder for measuring and discharging a predetermined amount of the solid bromine-based disinfectant in the storage tank. The storage tank and the metering feeder can be equipped with a solid bromine-based disinfectant stirring 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 is equipped with a disinfecting water preparation device that accepts a part of the treated water and mixes and dissolves the solid bromine-based disinfectant; and means for introducing the disinfecting water into the treated water. In wear. Furthermore, the disinfectant addition / mixing device can be installed in a flow path through which water to be treated flows. Furthermore, the 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, and the disinfectant is transferred to the injection point in the solid state. Disinfectant transfer piping, and disinfectant transfer piping, and the disinfectant injection device that adds the solid bromine-based disinfectant transferred through the piping to the water to be disinfected can be configured. . Furthermore, the apparatus can be configured so that the disinfectant completely dissolves before it reaches the discharge position of the water to be treated. Furthermore, a preparative line for collecting a sample of treated water, a disinfectant supply means for adding a disinfectant to the sampled treated water sample, and a treated water sample to which a disinfectant has been added. And an effective halogen concentration measuring device that measures the effective halogen concentration of the water to be disinfected according to the degree of decrease in the effective halogen concentration in the water sample to be treated after the addition of the disinfectant measured by the effective halogen concentration measuring device. The sewage treatment device can be configured to include a disinfectant addition amount control means for controlling the addition amount of the disinfectant added to the treated water by the agent addition / mixing device. In addition, a reducing agent supply device for adding a reducing agent to the water to be treated after adding the disinfectant, an effective halogen concentration measuring device for measuring the effective halogen concentration in the water to be treated after adding the disinfectant, A reducing agent-added calorie amount control device that controls the amount of reducing agent added according to the measured effective halogen concentration in the treated water after addition of the disinfectant can be further provided.

[0035] Another aspect of the present invention is a method for disinfecting sewage,

Inflow sewage is disinfected with chlorine or UV when the inflow sewage is below the specified value, and when the inflow sewage is over the predetermined value, the sewage with the specified value is supplied with chlorine or UV. The present invention relates to a sewage treatment method characterized by disinfecting and simultaneously removing a predetermined amount of sewage from the inflow sewage and disinfecting the sewage with a bromine-based disinfectant.

[0036] In the powerful method, the number of coliforms in the sewage is preferably 3000 or less per lcc of sewage by disinfection with chlorine or UV. In addition, disinfection with chlorine or UV can reduce the number of E. coli in sewage to 200 or less per lOOcc of sewage. Furthermore, 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 the sewage by disinfection with a bromine-based disinfectant Can be reduced to 3000 or less per lcc of sewage. In addition, disinfection with bromine-based disinfectants can reduce the number of E. coli in sewage to 200 or less per sewage lOOcc. In addition, sewage sterilized by chlorine or UV and sewage sterilized by Z or bromine-based disinfectants can be run into public waters. Also, disinfection time with bromine disinfectant can be within 3 minutes. Further, as a bromine-based disinfectant, a solid bromine-based disinfectant can be added to and mixed with water to be treated for disinfection. Furthermore, 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 added to the water to be disinfected. It can be carried out. Furthermore, the disinfectant can be completely dissolved before it reaches the location where the treated water is discharged. Furthermore, in the above method, a portion of the water to be treated is sampled, a bromine-based disinfectant is added, and the effective halogen concentration of the water to be treated to which the bromine-based disinfectant is added is measured. In addition, 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. In the above method, the effective halogen concentration in the treated water after the addition of the bromine-based disinfectant is measured, and the bromine-based disinfection is determined according to the measured effective halogen concentration in the treated water after the addition of the disinfectant. A reducing agent can be added to the water to be treated after the agent is added.

[0037] Hereinafter, 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 by the bromine-based disinfectant, is sometimes referred to as sewer stormwater overflow. However, this description does not limit the present invention. In the following description, the bromine disinfection device is sometimes simply referred to as a disinfection device.

Disinfection of sewage such as sewage and drainage is usually carried out using ultraviolet irradiation, ozone sterilization, and chlorine-based disinfectants such as sodium hypochlorite. In particular, chlorine-based disinfectants have many advantages compared to ultraviolet irradiation and ozone sterilization, such as simple equipment and high applicability to soil conditions.

[0038] However, the technology applied to normal sewage treatment is diverted to the treatment of sewer stormwater overflow. Then, the following problems arise. First, in the rainwater sewer overflow, ammonia and ammine coexist, so a chemical reaction represented by the following formula (1) occurs, the active chlorine changes to chloramine, and the bactericidal effect drops below lZio. Therefore, even if the number of pathogenic bacteria does not change and the presence of ammonia-camine, it is necessary to increase the amount of chlorinated disinfectant added. Formula 1

[0039] NH + + HC10 → NH Cl + H 0 + H ⁺ (1)

4 2 2

In addition, when using a chlorine-based disinfectant, the disinfection time of 15 minutes or more is required (see “Sewerage Facility Planning / Design Guidelines and Explanations”). A mixing tank for retaining the above is required. However, the drainage facility for sewer overflow in rainy weather does not have enough space to install such a mixing tank.

[0040] Therefore, in disinfection treatment of sewer stormwater overflow, a disinfectant having a short disinfection time and a mixing method thereof are required.

[0041] 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 black mouth 5,5 dimethylhydantoin (BCDMH), 1,3 dib mouth mouth 5,5-dimethylhydantoin (DBDMH), and the like. Can be mentioned.

[0042] In one aspect of the present invention, a device for storing a solid bromine-based disinfectant, a disinfecting water preparation device for obtaining disinfecting water by mixing the solid disinfectant with water, the disinfecting water, an organic substance, ammonia Alternatively, a disinfection device for sewer stormwater overflow is provided, which includes a disinfecting water addition device for disinfection by adding to rainwater sewer stormwater overflow containing ammonia ions.

[0043] In the present invention, the total organic carbon in the sewer stormwater overflow is preferably 5 mg / L or more. It is preferable that the concentration of ammonia ions in the sewer stormwater overflow is 1 mg / L or more.

[0044] The concentration of the disinfectant in the disinfecting water is preferably 100 mg / L as Cl to l Og / L as CI in terms of active chlorine concentration.

[0045] The addition concentration of the disinfectant in the sewer stormwater overflow is preferably 0.5 mg / L as Cl to 25 mg / L as CI in terms of active chlorine concentration.

[0046] In the addition step, the disinfecting water is introduced under the surface of the sewer stormwater overflow. It is preferable to include a process. Furthermore, it is preferable to further include a step of discharging the sterilized sewer stormwater overflow into the public water area.

[0047] 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.

[0048] In the present invention, the disinfecting water production apparatus mixes a disinfectant storage device, an apparatus for adding the disinfectant to the sewer stormwater overflow, and the disinfectant and the sewer stormwater overflow. It is preferable to have a device for Moreover, it is preferable that the said sand 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.

[0049] Preferably, the first flow path is connected to an addition device for introducing the disinfecting water below the surface of the sewer stormwater overflow!

[0050] It is preferable to further include a reservoir or a discharge channel for storing the sterilized sewer stormwater overflow so that it can be discharged into the public water area.

[0051] Preferably, the storage pond or the discharge channel is provided with a measuring instrument for inspecting the quality of the sterilized sewer stormwater overflow.

[0052] It is preferable to further include a second flow path for introducing a part of 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 ammonia ions is sterilized.

[0054] For example, in a combined sewer, sewage such as sewage and drainage and rainwater mix and flow through a sewer pipe. In addition, sewage mixed with both in this way, in particular, sewer stormwater overflow discharged without being treated at the sewage treatment plant is disinfected by the present invention.

[0055] In the sewerage sewer system, the sewer (raw water pipe) of raw sewage is separated from the sewer (rain pipe) of rainwater. Hydropower Disinfected by the present invention.

[0056] The content of organic matter in the sewer stormwater overflow is, for example, 10 mg of total organic carbon in the sewer stormwater overflow, even if the total organic carbon is 5 mg / L or more. It may be 30 mg / L or more, or 50 mg / L or more. In both combined and separated sewage, the total organic carbon is generally 5 mg / L or more.

[0057] The concentration of ammonia ions in the sewer stormwater overflow to be treated may be 1 mg / L or more, or 10 mg / L or more. When ammonia ions are contained in sewer stormwater overflow, the active bromine changes to bromamine (NH Br, NHBr, etc.). Shi

twenty two

However, bromamine can be effectively disinfected because it maintains the same level of disinfection as hypobromite. In combined sewage, the ammonia ion concentration is generally 1 mg / L or more. In addition, in diversion sewage, the ammonia ion concentration is often 1 mg / L or more in overflow water called first flush after rain.

[0058] In one aspect of the present invention, sewage diluted with rainwater is mainly targeted, but rainwater by a shunt sewer may be targeted. Further, water containing organic matter and ammonia or amine, such as sewage, human waste, industrial wastewater, or treated water, may be treated by the method of the present invention.

[0059] 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.

[0060] In the present invention, a solid bromine-based disinfectant is used. Compared to chlorine-based disinfectants, bromine-based disinfectants are characterized by a shorter disinfection time. Bromine-based disinfectants can be disinfected in several tens of seconds to several minutes, such as 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. . In addition, since hypobromite (HOBr) is easily decomposed in nature, it is not necessary to provide an apparatus for decomposing the hypobromite remaining in the waste water. In contrast, in chlorine-based disinfectants, active chlorine reacts with ammonia in sewage to form kulamin and reduce sterilizing power. It is difficult to disinfect. In addition, chloramine has high persistence, so it decomposes It is necessary to provide an apparatus for processing.

[0061] Examples of the solid bromine-based disinfectant suitably used in the present invention include 1-bromo 3 black mouth 5, 5 dimethyl hydantoin (BCDMH), 1, 3 dib mouth water 5, 5 dimethyl hydantoin (DBDMH) and the like. Can be mentioned.

[0062] 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 removing sewer stormwater overflow. Examples of drainage facilities for sewer overflow in rainy weather include stormwater discharge rooms for combined sewers, pumping stations (drainage station), sewerage pumping stations (drainage station), pumping pumps for sewage treatment plants, and sewage A facility that branches from the flow path from the first sedimentation basin of the treatment plant to the aeration tank and discharges the sewer stormwater overflow into the public water area. 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 drainage pump well, or added within a rainwater drainage pump inlet pipe. May be. In addition, these sewer overflow facilities for drainage often have sand basins. In that case, a disinfectant may be added in the sedimentation basin or at the inflow part of the sedimentation basin. The place of disinfectant addition is not limited to the above one, but can be added in several places.

[0063] Alternatively, in a drainage facility for sewer stormwater overflow, a main channel through which sewer stormwater overflow flows and a bypass channel that also divides the main channel are provided, and a disinfection tank is installed in the bypass channel May be. In this disinfection tank, disinfectant can be added to sewer stormwater overflow, and disinfectant can be dissolved in sewer stormwater overflow.

[0064] 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. In addition, if a disinfectant is added at the inflow section of the sand basin, the residence time in the sand basin can be used for the reaction time.

[0065] Since the disinfectant used in the present invention is solid at room temperature, the disinfectant can be dissolved in water to form disinfecting water, which 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.

[0066] For example, 1% by weight or more, preferably 10% by weight or less with respect to the saturated dissolution concentration of the disinfectant. Furthermore, more preferably, 20% by weight or more of the disinfectant can be dissolved, and disinfecting water may be used! However, it is not necessary to dissolve all of the added disinfectant in water, and solid disinfectant may remain in the disinfecting water.

[0067] The concentration of disinfecting water in terms of active chlorine concentration is preferably 100 mg / L as CI to: LOg / L as CI, preferably 200 mg / L as Cl to 2 g / L as CI. Is more preferable. If the concentration of disinfecting water is less than 100 mg / L as CU, the disinfectant may be consumed by diluting water without force if the amount of water added to the disinfecting water is large. May not be sufficient. On the other hand, when the concentration of disinfecting water is 10g / L as C, mixing of disinfectant and sewer stormwater overflow will be insufficient, and the disinfecting effect will be reduced.

[0068] 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 in general, the amount of rainfall, that is, the amount of sewer stormwater overflow and water quality Corresponding to this increase, the amount of disinfecting water added will increase. However, in one embodiment of the present invention, increasing the amount of rainwater reduces the pollution of the incoming water quality. Therefore, in one embodiment of the present invention, even if the amount of rainwater increases and the amount of inflow water triples, it is not necessary to triple the amount of disinfecting water or disinfectant added. Therefore, it is reasonable to find the optimum amount of influent water by brute force beaker test etc. and multiply the value by the amount of influent water to determine the amount of disinfectant water or disinfectant added.

[0069] Regarding inflow water quality, it is possible to grasp the state of rainwater contamination by measuring turbidity or electrical conductivity. With this index, on-time detection is possible. In addition to these indicators, rainfall patterns, particle properties in sewer stormwater overflow, SS content, chemical oxygen demand (COD), biological oxygen demand (BOD, Biological Oxygen Demand) ) Etc., and these indicators may be combined arbitrarily. In addition, as for the inflow water volume, various flowmeters may be used.

[0070] 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 through the bypass channel.

[0071] When the sewer stormwater overflow is rainwater-mixed sewage, human waste, or industrial wastewater, the concentration of the disinfectant in the sewer stormwater overflow is usually converted to the active chlorine concentration. 0.5 to 25 mg / L as CI is more preferable, and 1 to 15 mg / L as CI is more preferable. The concentration of the disinfectant can be calculated from the concentration and amount of the disinfectant in the disinfecting water, and the amount of sewer stormwater overflow. The concentration of the disinfectant is the value before the disinfectant is consumed in the sewer stormwater overflow.

[0072] 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: L0 ⁷ CFU / mL. By adding the above-mentioned amount of force disinfectant, it is possible to sterilize the water to be treated quickly and surely in about 1 minute.

[0073] FIG. 9 is a schematic explanatory diagram illustrating an embodiment of the present invention.

[0074] Sewer stormwater overflow flows into the discharge channel 12 as well as the main sewer pipe. The sewer stormwater overflow in the channel 12 moves to the discharge channel 17 through the discharge gate 11 and is discharged to the public water area 19. The sewer stormwater overflow in discharge channel 17 is measured with measuring instrument 18 such as residual halogen detector, turbidity meter, and conductivity meter. Residual halogen detector measures the residual concentration of active halogens such as hypobromous acid. Thus, it is preferable that the residual / logen detector is disposed between the discharge gate and the front of the discharge port.

[0075] LC value of active halogen detected by residual halogen detector (for example, BCDMH

50

In the case of 0.4 mg / L or more in terms of active chlorine (C1), the LC value will be below

2 50

Preferably LC value

50 1Z2 (For example, in the case of BCDMH, change the active chlorine (C1)

If the sum is 0.2 mg / L or more, the LC value

Reduce the supply of disinfectant or disinfecting water so that it is 50 1Z2 or less, or temporarily block it. As a result, adverse effects on aquatic organisms in public water bodies can be reduced.

[0076] Then, after confirming that these measured values and the number of coliforms meet a predetermined discharge standard, the measured value is discharged into a public water area 19 such as a river.

[0077] Public water includes rivers, lakes, harbors, coastal waters, public trenches, irrigation canals, and other public water bodies or channels.

In the embodiment of FIG. 9, a bypass channel 20 is connected to the channel 12. A part of the sewer stormwater overflow that flows into the channel 12 is introduced into the bypass channel 20. And in this sewer stormwater overflow, bromine-based disinfectant is added and converted into disinfecting water. Returned to channel 12.

[0079] A pumping pump 13 is disposed in the flow path 12. Part of the sewer stormwater overflow in the channel 12 is pumped to the bypass channel 20 by the pump 13.

[0080] 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.

[0081] 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 discharging the disinfectant to the bypass channel. It has an ejector 36 for use.

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.

[0083] 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 stirred by the agitator 44, and the disinfectant water 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.

[0084] When the solubility of the solid disinfectant is small, it is preferable to provide a dissolution apparatus 40. On the other hand, when the solubility of the solid disinfectant is high, the disinfectant dissolves quickly in the flow path, so a dissolution apparatus is not necessarily required.

[0085] The disinfecting water obtained by the device 40 is preferably guided by the pump 46 to the flow path 12 of the sewer stormwater overflow through the flow path 47.

[0086] In addition, a reservoir portion is formed in the flow path 12 or the discharge flow path 17 of the sewer stormwater overflow.

Alternatively, a stirrer or baffle can be placed to promote mixing of disinfecting water with sewer stormwater overflow.

[0087] In addition, when a sedimentation basin is disposed in the drainage facility for sewer overflow in rainy weather, disinfecting water may be introduced into the inflow portion of the sedimentation basin or the sedimentation portion of the sedimentation basin. Figure 10 shows a typical sand basin configuration. The sand basin 10 is divided into an inflow part 11 and a sand settling part 14a, b, c. [0088] A pumping pump 13 is disposed at the inflow portion 11 of the sand basin 10. The rainwater sewer stormwater overflow 12 is pumped into the bypass basin 20 by the pumping pump 13, which is part of the sewer stormwater overflow introduced into the inflow 11 of the sand basin. 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.

[0089] 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. It is guided to the sedimentation basin 10 through the channel 47. The disinfecting water may be guided directly to the sand basin 10 or may be guided to the sand basin 10 via a 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.

[0091] 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, 14c of the sand basin 10 as shown in FIG. Also good.

[0092] As shown in FIG. 11, when disinfecting water is introduced upstream of each of the sand settling parts 14a, 14b, 14c of the sand settling basin 10, the disinfecting water is supplied to the sand settling part 14a in the distribution tank 48. It is preferred to pre-distribute the disinfecting water led to each of 14b, 14c.

[0093] In the sand settling portions 14a, 14b, and 14c, the sand contained in the sewer stormwater overflow settles and is 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 channel 17 by the pump 16 and discharged to the public water area 19. In the sand settling parts 14a, 14b, and 14c, the sewage overflow water and disinfecting water during rain preferably stay for 1 to 30 minutes, more preferably 1 to 15 minutes, and still more preferably 1 second. Stay for ~ 10 minutes.

[0094] Fig. 12 shows an embodiment of an addition device for adding disinfecting water to sewer stormwater overflow. The adding 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 introducer is, for example, a plurality of hoses 54 suspended from the tube 52. The open end 56 of the hose is preferably located below the surface of the sewer stormwater overflow. Disinfecting water distributed from the distribution tank 48 flows in this order through the disinfecting water supply channel, pipe 52 and hose 54, and is added to the sewer overflow 15 in rainy weather. Added.

[0095] When the open end 56 of the hose 54 is located on the surface of the sewer stormwater overflow 15, the mist of the disinfecting water forms a mist from the open end 56 of the hose due to wind, etc. In particular, there is a risk of corroding electrical equipment. The open end 56 of the hose is preferably located below the surface of the sewer overflow 15 in rainy weather.

[0096] 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 polysalt polybule can be used. . The tube 52 preferably has sufficient mechanical strength to support the hose. It is preferably rigid, but may be flexible.

[0097] For example, 2 to 20, preferably 2 to 10, 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. However, the distance between two adjacent hoses may be different. The hose 54 is preferably flexible but may be rigid.

[0098] In the above, an example has been shown in which a part of sewer stormwater overflow is branched and used as disinfectant-dissolving water, but tap water, miscellaneous water, or the like is used as disinfectant-dissolving water. You can also.

FIG. 13 shows another embodiment that can be employed 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 stirrer 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 a motor 104 to rotate. In addition, air is supplied to the storage unit 101 from the air source facility 105. A predetermined amount of the 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.

[0100] According to the disinfectant storage device shown in Fig. 13, the shape of the storage part is cylindrical, for example, cylindrical, and the compaction of the powder and the bridge are performed by mechanical stirring by a stirring blade and stirring by air. Prevents formation. If the reservoir is an inverted conical shape like a conventional hopper, a bridge is formed by the solid disinfectant, which tends to cause poor supply. In particular, in the present invention, The purpose is to disinfect sewer stormwater overflow during heavy rains, so a solid bromine-based disinfectant is stored for a long period of time. It must be disinfected by adding it to the sewer overflow water during rainy weather. In addition, such disinfectant addition devices are installed in, for example, sewer storm drains and pump stations, and are operated by remote operation in an unattended state. Must be able to supply. In addition, solid bromine-based disinfectants are more susceptible to compaction and bridging than other solid powders! / And! / ヽぅ characteristics, and preventing solidification and bridging It is essential for the smooth supply of disinfectants. In the disinfectant storage device 100 shown in FIG. 13, the solid disinfectant is mechanically agitated by the agitating blade 103, and the 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. It is preferable to install a dehumidifier on the air introduction line 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, deterioration of the solid bromine-based disinfectant due to hydrolysis can be prevented. The supply of the stirring air can be performed intermittently. The supply amount of stirring air is preferably about 80 NL / min with respect to the reservoir lm ³ . As the air source 105, it is preferable to use a device that can always secure a pressure of 0.5 MPa or more. In addition, by continuously supplying dry air 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.

[0101] As the dust collector 106, a bag filter, a water washing tower, a cyclone, or the like can be used.

[0102] The shape of the solid disinfectant reservoir 101 is preferably a cylindrical shape, but a conical or square shape can also be used if a powder flow mechanism by a stirrer or air purge is provided. As a means for stirring the solid disinfectant in the storage section, a method of vibrating the container itself can be adopted in addition to the mechanical stirring and 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 reservoir includes a solid disinfectant storage tank 100, A fixed quantity feeder 102 that measures a predetermined amount of the powder in the storage tank 100 and discharges it to a supply destination is provided. 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.

[0105] The storage tank 100 will be described with reference to Figs. 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. Solid disinfectant is introduced into the container through 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.

[0106] The container main body 100c is provided with eight injection nozzles 132 that are compressed air injection ports that are opened in the vicinity of the stirring blades 130 at eight equal intervals in the circumferential direction of the peripheral edge thereof. The bottom plate 100a 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 via a dry compressed air force check valve 164 of a compressed air source 162. The compressed air is supplied with its injection amount, injection interval, etc. freely controlled.

[0107] The check valve 164 may be a well-known valve, for example, a poppet valve in which the valve element moves vertically with respect to the valve seat, or a swing in which the valve plate swings around the hinge with respect to the valve seat. A catch valve can be used. In order to 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 well-known means such as a spring 165, and is opened only when compressed air is flowed. I'll try to speak.

[0108] 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 a 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.

[0109] The agitating 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 communicating therewith, and the radial tip portion is bent toward the direction of rotation R and protrudes upward. The radiating blade 131 passes through the inside of the drive shaft 128 through the hollow portion. Then, pressurized air is supplied from the compressed air source 162 through the check valve 164 described above, and a plurality of injection ports 133 are formed on the ridgeline at the upper end of the triangular section and on the surface in the rotation direction R side. Yes.

[0110] The quantitative feeder 102 will be described with reference to Figs. The metering feeder 102 has a cylindrical container body 134, a drive shaft 138 disposed on the bottom plate 136 of the container body 134 and penetrating through the bottom plate 136, and a predetermined rotational direction RR about an axis 115 extending 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.

[0111] 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, the supply port 146 is formed on the bottom plate 136, and the upper end of the cylinder is a mounting flange. 147 is open and attached to the outlet 124 of the bottom plate 100a of the storage tank 100.

[0112] The turntable 140 is provided with a plurality of measuring chambers 140a, which are opened at the top and bottom and in the radial direction, 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 upper opening force is sequentially introduced into the measuring chamber 140a, and the upper opening is also closed at the part of the scraping plate 140b. Contained in weighing chamber 140a. In the center of the cutting plate 140b in the rotation direction RR, the lower opening is opened at 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 rotary table 40, a predetermined amount of powder is weighed and discharged to the supply port 146.

[0113] The cylindrical container body 134 is provided with injection nozzles 148 that are compressed air injection ports that are opened at three locations on the periphery of the container body 134 and in the lower part in the vicinity of the stirring blades 142. The injection nozzle 148 is supplied through the check valve 164 by controlling the dry compressed air force injection amount, the injection interval, etc. of the compressed air source 162 in the same manner as the injection nozzle 132 provided in the storage tank 100 described above. .

[0114] The stirring blade 142 includes a pair of radiating blades 143 and 143 extending radially in the opposite direction from the axis 115 to the inner peripheral portion of the container main body 134. Each of the radiating wings 143 communicates upward Has a convex hollow triangular cross section, and the tip end in the radial direction protrudes upward. The compressed air is supplied from the compressed air source 162 to the radiating blade 14 3 through the check shaft 164 through the drive shaft 138 into the hollow portion thereof, and is on the ridge line at the upper end of the triangular section and on the rotation direction RR side. A plurality of injection ports 150 are formed on the surface.

[0115] 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 disposed below the pipe member 107, which is a dissolution means for dissolving the discharged powder in water. Dissolved water from the melting cone 108 flows into the ejector 109 of the conduit 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 conduit 47.

[0116] In the melting cone 108, a plurality of nozzle force water is discharged at the periphery of the upper end of the funnel-shaped body that spreads upward, and the discharged water forms a spiral along the inner surface of the funnel-shaped body. Washed away. 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. There is a solid disinfectant remaining in the disinfecting water!

[0117] According to the solid disinfectant storage and supply device having the configuration described above, a dissolution cone is provided between the drug supply unit and the chemical dissolution unit, and the chemical cut out by the supply unit falls to the dissolution cone. It was. 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.

[0118] In addition to the table feeder type described above, a drug feeder type or rotary valve type supply device can be employed as the chemical supply unit. 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.

[0119] 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) as a plurality of containers having an openable / closable outlet 184 containing a solid disinfectant at the disinfectant inlet 126. And the discharge port 184 (state of FIG. 19). [0120] The container 186 will be described with reference to FIG. The container 186 has a container body 114 having a discharge port 184 formed at the lower end, a cone 116 that is provided at the discharge port 184 and is normally closed by closing the discharge port 184, and one end connected to the cone 116. And a cone rod 118 which is a shaft member extending upward in the container main body 114 and projecting 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 biasing means 120 having a spring disposed in the container body 114.

[0121] The container main body 114 includes a cylindrical vertical main body 114a, an upper lid 114c having a powder inlet 114b, a funnel-shaped bottom 114d in which a cone 116 contacts and a discharge outlet 184 is formed, and A cylindrical guide portion 114e is formed at the tip of the bottom portion 114d and is detachably connected to the storage tank 101. A frame 14f for storage, movement, placement on the storage tank 101, and the like is provided on the outer periphery of the lower portion of the main body 114a.

[0122] The cone 116 has a hollow cone shape, and a cone seal 117, which is a seal material that comes into contact with the discharge port 184, is attached to the outer peripheral edge of the bottom surface, and the top portion is connected to the cone rod 118. Yes.

[0123] The cone rod 118 is slidably guided up and down by a shaft guide 114g attached to the upper lid portion 114c. The biasing means 120 includes a compression coil spring 121 between the shaft guide 114g and the pin 119 of the cone rod 118. A cone rod 118 is passed through the compression coil spring 121. The protruding upper end of the cone rod 118 is provided with 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).

[0124] With reference to FIG. 21, an example of the installation form of the solid disinfectant supply facility configured as described above will be described. Near the solid disinfectant storage tank 101 and metering dispenser 102, there are a plurality of containers 186 containing solid disinfectants at intervals, in a three-tier shelf 156, in a direction perpendicular to the paper surface of FIG. Column, stored. A stagger crane 158 is provided between the storage tank 101 and the fixed quantity feeder 102 and the shelf 1 56, and the container 186 on the shelf 15 6 is appropriately taken in and out as needed by the stagger crane 158. 186 is placed on storage tank 101 by inserting guide part 114e of discharge port 184 into storage tank input port 126. It is.

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

[0126] An embodiment using a flexible container bag 180, which is another form of a container containing a solid disinfectant, will be described with reference to FIG. 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 has 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 bracket 182 using the electric chain block 184 at the storage location, 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 opening a tape, a rope, or the like that closes the discharge port 180a, and the storage tank 101 is filled with the solid disinfectant.

[0127] The operation of the solid disinfectant supply facility as described above will be described.

[0128] (1) The required amount of solid disinfectant can be supplied when needed:

The solid disinfectant is stored in multiple containers, such as container 186 or flexible container bag 180, and the containers are sequentially connected to storage tank 101 according to the required amount of the supply destination, and the storage tank 101 is filled with powder. The filled powder is weighed in a predetermined amount by the quantitative feeder 102 and supplied to the supply destination. Therefore, the amount of powder stored in the container and the storage tank can be reduced, and solidification of the powder due to compaction can be prevented. Further, the storage tank 101 is equipped with the stirring means 130, the fixed quantity feeder 102 is provided with the stirring means 142, and the compressed air is periodically injected into the storage tank 101 and Z or the fixed quantity feeder 102 from the peripheral wall, the stirring means, etc. Further, solidification of the powder can be prevented. Therefore, a necessary amount of powder can be supplied when necessary.

[0129] (2) Do not touch the workers with powder! / ヽ：

Container 186 or flexible container bag 180, which is a container containing solid disinfectant, is placed on storage tank 101 with its discharge port connected via input port 126 to store solid disinfectant 10 1 is filled, it is not necessary to open the bag in which the powder is sealed and fill the storage tank 101 with the powder, and the operator can be prevented from touching the powder.

[0130] (3) Check valve:

Since the compressed air is injected into the storage tank 101 and the metering feeder 102 via the check valve 164, the inside of the tank 101 and the metering feeder 102 can be maintained in a pressurized state, and the powder from the supply port 146 can be maintained. You can get out of your body more smoothly.

[0131] (4) Flexible pipe member connected to the metering feeder:

The tube member 107 connected to the powder supply port 146 of the quantitative feeder 102 is made of a synthetic resin such as flexible vinyl chloride, so that the rotary table 140 in the pressurized quantitative feeder 102 is measured in the measuring chamber 140 When 140a intermittently communicates with the solid disinfectant supply port 146 by the rotation of the rotary table 140, the solid disinfectant in a pressurized state is intermittently discharged to the tube member 107, and the tube member 107 expands and contracts by its action. Therefore, the solid disinfectant is prevented from being blocked in the pipe member 107. It is not necessary to hit the outside from the outside in order to prevent the blockage that occurs 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 in the tube member 107 can be confirmed conveniently.

[0132] (5) Dissolution means:

Furthermore, if the solid disinfectant weighed 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 transferred to the transport line that is pumped with running water. It can be sent efficiently and effectively compared to sending the body to the supplier.

[0133] In addition, the apparatus described above can be modified or modified in various ways within the scope of the present invention as described below.

[0134] (1) Installation position of metering feeder:

In the present embodiment, the fixed amount feeder 102 is attached to the outside of the storage tank 101. However, the fixed amount feeder 102 is installed in the storage tank 101 so as to be driven on the same axis 115 as the stirring means 130, for example. You can do it.

[0135] (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 fixed amount. It was supplied to a plurality of injection nozzles 132, 148, injection ports 133, 150, etc. of the machine 102 through a common check valve 164, but the storage tank 101, fixed quantity supply machine 102, stirring blade 130, stirring blade 142, etc. Depending on the size, shape, type of solid disinfectant to be handled, supply interval of compressed air, etc., check valve should be connected to the injection nozzle and Z or so that the solid disinfectant will not clog the injection nozzle and injection port. Prepare for each part of the injection port.

[0136] Fig. 23 shows another configuration example of the dissolving portion that dissolves the solid disinfectant in water to form disinfecting water. The solid disinfectant storage tank 101 described in FIG. 13 and the like is installed on a pit 210 provided in the flow path 12 of sewer stormwater overflow. A disinfectant guide pipe 107 connected to the metering feeder 102 is disposed in the pit 210 in a counter-force. 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 up 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. The solid disinfectant falling from the upper disinfectant guide pipe 107 is put into the underwater mixer 202, and the disinfecting water is sufficiently mixed in the underwater ejector 201 to form disinfecting water. To the treated water, that is, the sewer stormwater overflow. Note that FIG. 23b is a view of the AA line in FIG. 23a viewed from the top, and thus the discharge port 204 is branched and arranged.

[0137] With such a configuration, the height of the apparatus can be reduced. In the conventional solid disinfectant storage 'feeding device, the mixer is disposed below the feeding device, so the height force S of the device is inevitably high. With the above configuration, the mixer is disposed in the sewage flow path, so that the height of the apparatus is reduced. Actually, the conventional solid disinfectant storage and supply device was about 5.5 m high, but in the configuration shown in FIG. 23, the device height 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 the mixer becomes small, the power for water supply can be reduced. Furthermore, in the conventional solid disinfectant storage and supply device, the disinfectant mixer and the disinfecting water injection device are disposed on the ground above the sewer stormwater overflow channel. If the disinfecting water overflows, the disinfecting water will be scattered around. However, in the configuration shown in Fig. 23, the disinfectant mixer is placed in the sewer stormwater overflow. Even if the mixer disinfecting water overflows due to clogging, etc., it will only enter the sewer sewage overflow during treatment rain and will not contaminate the surroundings.

[0138] Fig. 24 shows another form of the solid bromine-based disinfectant storage and supply device that can be used in the present invention. The storage and supply device for solid bromine-based disinfectant shown in Fig. 24 has a storage tank 250 having a solid bromine-based disinfectant inlet 252 at the top and an opening at the bottom of the storage tank 250 (solid bromine-based disinfectant discharge port). It consists of a solid bromine-based disinfectant quantitative supply device 251 attached. The storage tank 250 has, for example, a barrel 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. Yes. 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 contained in the storage tank 250 is fed to the feeder by the motor 254. By rotating 255, a predetermined amount is supplied through the induction tube 107. A solid disinfectant dissolving device such as a dissolving cone 108 shown in FIG. 13 or an underwater mixer 202 shown in FIG. 23 can be arranged below the induction 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 rotating the storage tank. In addition, there is an advantage that the height of the storage tank can be lowered and that air for stirring the solid disinfectant is unnecessary.

[0139] Fig. 25 is a diagram showing another form of a solid bromine-based disinfectant storage and supply device that can be used in the present invention. In the apparatus shown in FIG. 25, a fluid single-screw pump 312 for transferring powder is connected to the discharge port at the bottom of the solid bromine-based disinfectant storage tank 310. By rotating the screw portion 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 induction 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 water mixer 202 shown in FIG. 23 can be arranged below the induction tube. This way This eliminates the need to install a solid bromine-based disinfectant dissolution device directly below the chemical storage tank, thus reducing the height of the facility. In addition, it is not necessary to place a large amount of dissolved water for dissolving solid bromine-based disinfectant in the vicinity of the chemical supply facility, so that construction costs for the entire plant can be reduced and 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. in the UK 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 and supply device. Note that the solid bromine-based disinfectant storage tank 310 shown in FIG. 25 is a so-called hopper type, but is provided with a consolidation preventing mechanism 311 such as a mechanical stirrer or air purge on the bottom surface. Prevents formation. Of course, for example, the storage tank shown in FIGS. 13, 15, 24, etc. can be used.

Fig. 26 shows another example of a fluid 'solid bromine-based disinfectant storage' supply device using a single screw pump for 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 the solid bromine-based disinfectant is introduced into the inlet 322. Single screw screw pump 312 is rotated by the motor 321 and the dissolution water is transferred through the pipe 324 and the solid bromine-based disinfectant is transferred from the inlet 325. Introduced in 312. 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 A bromine-based disinfectant slurry is formed and transferred through induction tube 328. The solid bromine-based disinfectant slurry transported in the induction 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 that is difficult to dissolve in water can be obtained at a certain concentration by dispersing a solid odor-based disinfectant in water and throwing it into the sewer stormwater overflow to be treated. As a slurry, it is transferred to the entry point and quickly separated into the sewer stormwater overflow. It is possible to dissolve and dissolve.

[0141] By combining two single screw pumps in this way, for example, the single screw pump 312 for transferring a solid bromine-based disinfectant is made larger than the single screw pump 320 for supplying water. Thus, the chemical in the storage tank 310 can be forcibly sucked into the single screw pump 312. Therefore, by appropriately adjusting the capacities of the single screw pump for transferring the solid bromine-based disinfectant and the single screw pump for water supply, the supply amount of the drug can be finely adjusted.

[0142] In the rainwater sewer overflow water disinfection device described above, a solid bromine-based disinfectant is first mixed and dissolved in water, for example, a portion of the rainwater sewer overflow water to be treated. Disinfecting water is formed and this is thrown into sewer stormwater overflow for disinfection. However, in another embodiment of the present invention, the solid bromine-based disinfectant can be infused and dissolved in the sewer stormwater overflow to be treated in the solid state for disinfection.

[0143] 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 as a solid. In the disinfectant storage tank 401, a powdery or granular solid bromine-based disinfectant 408 is accommodated. The disinfectant 408 is sent to the disinfectant transfer pipe 405 via 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 equipped with a stirring blade 407 connected to a motor 406, and by the action of this stirring blade 407, a powdery or granular solid bromine-based disinfectant 408 is dissolved in the water to be treated.

[0144] Note that the disinfectant injection device 409 preferably has a means for generating a jet of water to be disinfected, and the disinfectant injection device is in a reduced pressure state by the action of the generated jet. Thus, it is preferable to have a structure in which the solid bromine-based disinfectant in the form of powder or granules can be transferred by the suction force generated by this reduced pressure. Some specific examples of such a structure are shown in FIGS.

[0145] The disinfectant injection device 409 shown in Fig. 28 includes a narrow tube 424 surrounding the shaft connecting the motor 406 and the stirring blade 407, and a cover 421 surrounding the vicinity of the end of the thin tube 424. ing. The terminal portion of the thin 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 thin 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 of the narrow tube. Due to this jet flow, the inside of the narrow tube 424 is depressurized, and the powdery or granular solid bromine-based disinfectant 423 is urged toward the terminal portion of the thin tube 424 by air due to 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. The disinfectant transfer pipe 405 is connected near the outlet of the orifice. A jet 432 is generated by the flow of the waste 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 form. It is transferred to the jet and is mixed with waste water by the stirring action of the jet.

Further, in the disinfectant injection device 409 shown in FIG. 30, a pump 441 is arranged in the water flow 412 of sewer stormwater overflow, and this power drainage is introduced into the pipe 443, and again through the ejector 442. Returned to 412. A disinfectant transfer pipe 405 is connected to the ejector 442. A jet is generated by the ejector 442, and the vicinity of the end of the disinfectant transfer pipe 405 is depressurized, and the powdery or granular disinfectant is transferred to the pipe 443 by the suction force generated by this, It is mixed with waste water by the stirring action of the jet. As a means for reducing the pressure in the disinfectant injecting apparatus, a suction machine can be installed in the vicinity of the disinfectant injecting apparatus 409 in addition to the above configuration.

[0148] Thus, the following advantages can be obtained by mixing the solid bromine-based disinfectant directly into the sewer stormwater overflow to be treated in the solid state.

[0149] First, a facility for dissolving a disinfectant required by a method of injecting the disinfectant into water to be disinfected after dissolving or suspending the disinfectant in advance, that is, a dissolution tank, a stirring device, an ejector, and the like are unnecessary. Equipment costs are reduced. Furthermore, equipment for pumping disinfecting water after dissolving or suspending in water to the point of injection into the water to be disinfected, that is, a transfer pump, an ejector, etc., is unnecessary. In addition, when a slurry-like disinfectant is injected into the water to be disinfected, the disinfectant is unevenly distributed in the dissolution tank. In order to prevent it from being distributed evenly, thorough stirring must be continued in the dissolution tank, but the solid bromine-based disinfectant should be put directly into the sewer stormwater overflow to be treated. By mixing, this operation becomes unnecessary. Furthermore, the disinfectant in the form of a solution or slurry does not accumulate in the pipe and clog.

[0150] In particular, when disinfecting sewer stormwater overflow by injecting disinfectant solution, the required amount of disinfectant solution depends on rainfall conditions and varies greatly. In order to carry out the treatment, it is necessary to always prepare more disinfectant solution than necessary. However, once the disinfectant is dissolved in water, it is difficult to store the disinfectant in a solution state in which the disinfection activity is significantly lower than that in the solid state. Therefore, a solution prepared in excess of the required injection volume must be discarded, resulting in increased operating costs and resource waste. However, by using a solid bromine-based disinfectant directly in the rainwater sewer stormwater overflow that is to be treated and mixing it in the solid state, only the required amount can be stored when necessary. Since it is discharged, it is possible to appropriately control the injection amount of the disinfectant, and no disinfectant solution is wasted when the injection is completed. 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, it is easy to control the amount of disinfectant injection, and the risk of over-injection and insufficient injection is reduced. Furthermore, by adopting a structure that generates a jet in the disinfectant injection device, the disinfectant transfer pipe is reduced in pressure and the powder or granular disinfectant is transferred, causing damage to the transfer pipe. However, the disinfectant will not blow out the damaged parts.

[0151] In the form described above, solid bromine-based disinfectant is put into the sewer stormwater overflow that is to be treated as a solid * mixed to disinfect sewer stormwater overflow. In order to perform disinfection treatment by introducing solid bromine-based disinfectant into the sewer stormwater overflow, it is not always necessary to perform the mixing operation of the disinfectant and the sewer stormwater overflow to be treated at the injection point of the disinfectant. Absent.

[0152] The first purpose of the mixing operation is to dissolve a solid disinfectant in the water to be treated. If the disinfectant is in a solid state, the contact efficiency between the disinfectant and the water to be treated is low, and the disinfection rate is reduced. Dissolving the disinfectant improves the contact efficiency between the disinfectant and the water to be treated. Increases poison speed. If there is a restriction on the time it takes for sewer stormwater overflow to be discharged into public waters, it is important to increase the speed of disinfection in order to obtain a sufficient disinfection effect.

[0153] The second purpose of the mixing operation is to uniformly disperse the disinfectant in the water to be treated.

If the disinfectant is not evenly distributed throughout the treated water to be disinfected, it will be added excessively in areas where the disinfectant concentration is high, and if the disinfectant is wasted, high concentration will be generated in public water areas where it will be used by force. Residual halogen may be released. On the other hand, at locations where the concentration of the disinfectant is low, insufficient addition will result in insufficient disinfection. By dispersing the disinfectant uniformly in the water to be treated and making the disinfectant concentration uniform, it is possible to add disinfectant without excess or deficiency.

[0154] The third purpose of the mixing operation is to dissolve the disinfectant in the treated water and diffuse it so that the residual halogen concentration is below a certain level until the sewer stormwater overflow reaches the public water area. Is to reduce the degree. If the disinfectant remains solid or the dissolved disinfectant flows out into public waters with uneven and high concentrations, it will release high concentrations of residual halogen locally, which will affect the destination ecosystem. May have adverse effects. In order to prevent this, it takes time for the disinfectant to completely dissolve before the sewer stormwater overflow reaches the public water area, and to reduce the residual halogen after dissolution. For this reason, it is important to dissolve and diffuse by mixing disinfectants.

[0155] By the way, the time required for the halogen-based disinfectant to disinfect by its disinfecting ability (oxidation power) and the disappearance of the acidity by the completion of the acidification reaction is compared to the time required for dissolution. Short enough. For example, when 1-bromo-3-chloro-5,5-dimethylhydantoin (BCDMH) is used as a halogen-based disinfectant and the disinfection treatment is performed at an effective halogen concentration of about 2 mg / L as CI, the disinfectant's oxidizing power disappears. It can be used as an index that the effective halogen concentration is reduced to 0.5 mg / L as CI or less. When the amount of disinfectant added is 10 mg / L as CI, the time required for the disinfectant to dissolve in the water to be treated is about 1 minute, whereas the effective halogen concentration is 0 to 2 mg / L as CI. The time required to decrease to 5 mg / L as CI is about 10 to 30 seconds. This time varies because it is affected by the concentration of organic substances in the treated water, that is, the sewer stormwater overflow. Therefore, a little disinfectant If it is dissolved and secured for about 30 seconds after it is completely dissolved, it is possible to achieve both a sufficient disinfection effect and a reduction in the residual halogen concentration of the discharged water.

[0156] 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 colon bacteria 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 halogen accompanying acid and sour reactions such as disinfection reactions, so the increase due to dissolution of the disinfectant offsets the decrease due to consumption due to acid and soot reaction. However, if it continues to increase, it will shift at a certain abundance. And after the undissolved disinfectant disappears, the residual halogen concentration decreases rapidly. During this time, the coliform group is constantly exposed to the oxidative power supplied, so it continues to decrease until the residual halogens are depleted.

[0157] Therefore, according to another aspect of the present invention, the solid bromine-based disinfectant is put into the sewer stormwater overflow to be treated in a solid state until the disinfectant reaches the public water area from the addition position. It is possible to disinfect the sewer stormwater overflow in such a way that it completely dissolves in the meantime.

[0158] Fig. 32 shows the concept of a sterilization device for sewer stormwater overflow that works on another aspect of the present invention based on the technical concept of Fig. 32. 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, transferred via the disinfectant transfer pipe 504 to the disinfectant addition position 506 provided in the sewer stormwater overflow channel 505, and disinfected. Added to target sewage stormwater overflow 507. The sewer stormwater overflow with the disinfectant added flows through the channel 507 from the disinfectant addition position 506 to the sewer stormwater overflow outlet 508 for a certain period of time, and then flows from the outlet 508 to the river J 11 Discharged into public water areas 509.

[0159] In a preferred embodiment, the time to reach the discharge port 508 is at least 2 minutes after the disinfectant is added at the disinfectant-added caro position 506, and the disinfectant is completely dissolved and the force is at least It is preferable to secure 1 minute. As a result, the disinfectant dissolves and diffuses in the sewer stormwater overflow by the water stream while flowing down the flow path 507. The disinfectant develops disinfection ability (oxidation power) sequentially from the dissolved one, and performs disinfection reaction. The disinfecting ability (acidity) disappears due to the reaction. Therefore, the solid bromine-based disinfectant dissolves in the sewer stormwater overflow by the water flow while flowing down the channel 507, so that the disinfecting power (oxidizing power) continues to be supplied little by little for a certain period of time. Since the supplied disinfecting capacity is consumed and disappears by successive acid-oxidation reactions, residual halogen does not remain at a high concentration at the outlet 508.

[0160] 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 addition position 506 of the disinfectant to the outlet 508, the channel 507 is a bypass channel 507a. It is also possible to make the bypass channel 507a a tank of the same capacity.In that case, in order to prevent a short circuit flow in the tank and bring the flow close to the extruding flow, a partition is formed in the tank. It is preferable to arrange a plate. The bypass channel can be either a horizontal bypass type or a vertical bypass type.

FIG. 34 shows another example. In this example, a dehalogenating agent addition apparatus 510 is installed in the middle of the flow path. If an excessive amount of disinfectant is added, the residual amount and logogen may not be sufficiently reduced until the outlet 508 is reached. In preparation for such a case, a reducing agent such as sodium sulfite is added from the dehalogenating agent addition apparatus 510 to neutralize residual halogen. The position of addition of the reducing agent from the denoising / logging agent addition device 509 may be in the middle of the bypass channel 507a or downstream of the bypass channel 7a.

FIG. 35 shows still another embodiment. In this example, the flow channel of the sewage overflow water after the addition of the disinfectant was constituted by the static mixer 507b. If the time to the outlet 508 can be secured without lengthening the flow path, the disinfection effect can be further enhanced by promoting the dissolution / mixing by the water flow with the static mixer 507b.

[0163] Further, FIG. 36 shows still another embodiment. For example, when disinfectant is added to the sewer stormwater overflow from the sewer stormwater overflow facility 511 such as a rainwater spout chamber or a pumping station of the combined sewer, it is sufficient to reach the outlet 508. Time may not be secured. In this case, an injection point 514 is provided in the sewer pipe 513 upstream of the sewer stormwater overflow drainage facility 511, and a solid bromine-based disinfectant is added thereto, so that the disinfectant is added to the treated water. Secure the time to reach the outlet. However, in this case, a part of the sewage to which the disinfectant is added flows into the sewage treatment plant 512. So If the residual halogen concentration does not decrease before the sewage to which the disinfectant is added reaches the sewage treatment plant 512, a dehalogenating agent adding device 510 is installed in the middle of the sewage treatment plant 512, and a reducing agent such as sodium sulfite. The residual halogen can be neutralized by adding.

[0164] Fig. 37 shows another configuration example of a disinfecting apparatus that disinfects solid bromine-based disinfectant as it is in the solid wastewater sewer stormwater overflow. The disinfectant storage tank 551 contains a bromine-based disinfectant 559 in the form of a powder or granules. The disinfectant 559 is weighed 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 channel 557 via the disinfectant transfer pipe 553, and then disinfected. It is discharged into the public water area from the outlet 508.

FIG. 38 shows another configuration example. The disinfectant storage tank 551 contains a bromine-based disinfectant 559 in the form of powder or granules. 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 5 53 is connected to the disinfectant mixing device 554, and the disinfectant 559 supplied to the disinfectant mixing device 554 is passed over the sewer in rainy weather flowing through the channel 557 in the mixing device 554. It is poured into running water and mixed. Further, 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 pressure inside the storage tank 551 and the injection amount control device 552 in a constant pressure state, the pressure adjustment 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 volume control device 552 is discharged into the atmosphere after the disinfectant in the exhaust gas is removed by the dust removal device 556. Disinfectant water discharged from the disinfectant mixing device 554 is added with a reducing agent by the reducing agent addition mixing device 561 to neutralize residual halogen, and the power is also discharged from the outlet 508. You can also. 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, pipe or tank having a bypass wall, 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.

[0166] Next, a method for controlling the injection amount of the solid bromine-based disinfectant in the present invention will be described. To do. Needless to say, it is preferable to use a halogen-based disinfectant such as a solid bromine-based disinfectant with less influence on the environment and human beings. However, until now, from the viewpoint of safety measures, in order to achieve and maintain a sufficient disinfection effect of pathogenic bacteria, it has been the actual situation that an excessive disinfectant exceeding the concentration of the active ingredient of the disinfectant that is originally necessary has been used. is there.

[0167] However, if the residual halogen concentration in the wastewater after disinfection that is released into public water areas is too high, it may adversely affect ecosystems such as aquatic organisms and animals and plants that grow in the public water areas. As it became clear, they came to realize that it was necessary to add the proper disinfectant concentration to the wastewater.

[0168] 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 concentration of sewage is high and the concentration of reducing organic and Z or inorganic substances is high, dilution with rainwater proceeds. When the sewage concentration decreases and the reducing organic concentration and Z or inorganic concentration decrease, the required amount of disinfectant differs greatly, and an appropriate minimum amount of disinfectant may be added according to the water quality fluctuation. There is a problem that it is difficult.

[0169] Therefore, in the present invention, an appropriate amount of the disinfectant that exhibits an appropriate disinfecting effect and does not generate residual halogen is obtained according to the water quality fluctuation of the waste water, and the minimum necessary amount of disinfectant is applied. It can be added to the treatment liquid.

[0170] Hereinafter, the technical idea of one method for controlling the injection amount of a 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 stormwater overflow at various times during rainfall is sampled into a beaker, BCDMH is used as the disinfectant, and the disinfectant load is 3 ppm (= mg / L). In addition to the beaker, it was disinfected for 90 seconds. The relationship between the elapsed time after the start of rainfall and the number of coliforms in the treated water after disinfection was determined. The results are shown in FIG.

[0171] 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). In both cases, the disinfection target value (discharge standard value stipulated in the Water Pollution Control Law: 3000 CFU / mL or more) Do not satisfy (below). One hour and 30 minutes after the rain (C time point), the number of coliform bacteria after disinfection was less than 10 CF U / mL, which is below the disinfection target value. This is because the properties of sewage during rainy weather change as rain continues, and even at the same disinfectant addition amount (3 ppm), the disinfection effect is different, resulting in a state where the disinfectant is excessive or the disinfectant is too small. It is shown that. That is, immediately after the start of rainfall, the coliforms in the sewage flow out at a high concentration, so a large amount of disinfectant is necessary to fully disinfect this, but the rain start force has passed for some time. At that time, sewage is diluted by rainwater and the number of coliforms in the wastewater decreases, so the amount of disinfectant required for disinfection is reduced.

[0172] Next, 0.5 hours after the start of rainfall (point A in Fig. 39), collected sewage overflow water was collected into a beaker, and BCDMH was collected at various addition rates and disinfected for 90 seconds. After treatment, 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 coliforms after disinfection is 10 ⁴ CFU / mL or more, and the disinfection target value of 3000 CFU / mL is not satisfied. The number of coliforms after disinfection in the treated water is slightly higher than 3000 CFU / mL at the BCDMH addition rate ppm, and below 100 CFU / mL at the BCDMH addition rate rate ^ ppm, which is well below the disinfection target value. It was. Based on the above, it can be seen that sterilization of sewage overflow water at this point requires that BCDMH be supported at an addition rate of about 4.2 to 4.3 ppm.

[0173] Furthermore, 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 E. coli after 90 seconds of disinfection were similarly applied. The relationship with the number of groups was examined, and the results are shown in Figs. 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.

[0174] Next, the combined sewer overflows at point A (30 minutes after the rain), point B (45 minutes after the rain) and point C (1.5 hours after the rain) in Figure 39 are collected. The water was taken into 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 investigated. The results are shown in FIG. At point A (30 minutes after rain), the residual halogen concentration was already less than 0.1 mg / L asCl immediately after the disinfectant was added. Considering the results of 39, it can be said that the disinfection effect of the liquid to be treated is not sufficient when the BCDMH addition rate is 3 ppm. At point B (45 minutes after rain), the residual halogen concentration is about 0.1 mg / L as CI about 20 seconds after the addition of the disinfectant, and it is almost close to Omg / L as CI after 100 seconds.

twenty two

Considering the results shown in Fig. 39 (disinfection time 90 seconds and number of coliforms 4700 CFU / mL), the amount of 3 ppm disinfectant added at time B is still slightly less than the required amount. At C, the residual halogen concentration was about 0.3 mg / L as CI, about 15 seconds, about 20 seconds after the addition of the disinfectant.

2

It gradually decreases to 0 seconds, but after about 150 seconds, it is stable at about 0.1 mg / L as CI (disinfection action)

2

Is saturated). From this, it can be seen that the amount of 3 ppm of disinfectant added at point C (1.5 hours after rain) was excessive, and residual halogen remained after disinfection.

[0175] Based on these results, in the treatment of sewage in rainy weather at the sewage treatment facility, the residual halogen concentration after disinfectant treatment is considered to have some allowance to reliably achieve the disinfection target value. Therefore, it should be set at approximately the midpoint between lines B and C in Figure 43. That is, from FIG. 43, if the residual halogen concentration is set to 0.2 mg / L as CI 20 seconds after adding BCDMH,

2

Good. In actual disinfection treatment, drainage samples should be taken periodically, and the degree of decrease in residual halogen concentration should be measured by adding disinfectant at a predetermined concentration. This is the value set above (in the above case, residual halogen concentration 0.2 mg / L as CI 20 seconds after adding disinfectant)

If 2 is too high, the amount of disinfectant input to the wastewater is adjusted to a value lower than the concentration input to the wastewater sample. Conversely, if the degree of decrease in residual halogen concentration is lower than the set value, disinfection Adjust the agent input to a higher value than the concentration in 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 can be sufficiently reduced and no residual halogen is generated! / It becomes possible to maintain the value. 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 the residual halogen concentration measured over the sample and the set value, how much the concentration actually put into the wastewater should be increased or decreased. This can be determined empirically by the vendor.

[0176] The curves in Fig. 39 and Fig. 43 show some changes if the target sewage treatment facilities are the same. Although there is movement, it shows almost the same tendency. Therefore, in the sewage treatment facility to be treated

39, create a graph as shown in Fig. 43 and set a target value for reducing the residual halogen concentration, and then control the amount of disinfectant added to sewage during rainy weather based on this set value during subsequent rainfalls. It can be performed.

[0177] Fig. 44 shows a configuration example of a disinfection device for sewer stormwater overflow according to one embodiment of the present invention configured based on this technical idea.

[0178] The disinfection device shown in Fig. 44 includes an introduction line 602 of a liquid to be treated (sewer overflow in rainy weather) 601, a disinfection tank (sedimentation basin) 603, and a disinfectant for introducing a disinfectant into the liquid to be treated. Introducing means 2004 is provided. As the disinfectant introduction means, the disinfectant supply devices of 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 sewer stormwater overflow channel without providing the disinfection tank (sedimentation basin) 603. In addition, a preparative line 612 for collecting a test liquid sample to be tested is connected in the process liquid introduction line 602. A pumping pump 616 is connected to the sorting line 612.

[0179] In order to carry out the disinfection method according to the present invention, first, as a preparatory stage, in the rainwater sewer stormwater drainage facility to be treated, a plurality of items after various times have elapsed since the start of the rain at the time of rain. A sample of overflow water was collected, and an appropriate amount of disinfectant was added to the sample to measure the number of coliform bacteria after disinfection, so that the relationship between the elapsed time after rainfall and the number of coliform bacteria after disinfection (Fig. 39) and the relationship between the elapsed time after addition of the disinfectant and the residual halogen concentration in the treated water (graph in Fig. 43). Set the value. For example, when the relationships shown in FIGS. 39 and 43 are obtained, as described above, a target value of 0.2 mg / L as CI for the residual halogen concentration is set 20 seconds after the addition of the disinfectant.

2

[0180] Disinfection of sewer stormwater overflow is performed by adding an appropriate amount of disinfectant from the disinfectant introduction means 604 and treating in the disinfection tank 603. In the method of the present invention, disinfectant is added. The previous liquid to be processed is periodically sampled from line 612. The sampled liquid to be treated is stored in the monitoring tank 613, where a predetermined amount of disinfectant 614 is stored. Is added and mixed and stirred by a stirrer (not shown). The concentration of the disinfectant added to the monitoring tank is the concentration of the disinfectant actually supplied to the liquid to be treated by the disinfectant introduction means 604 at that time in order to enable precise concentration control. I like it. 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 value of the residual halogen concentration after adding the disinfectant. Residual halogen concentration measuring instruments that can be used for this purpose include, for example, a polarographic free chlorine meter (for example, product name CL M-37 or CLM-22 manufactured by Toa DKKEI Co., Ltd.). Can do. The measured residual halogen concentration value is recorded by a recorder 618. Then, regarding the rainwater sewer stormwater drainage facility, the preset target value and the value measured in the monitoring tank 613 are compared. For example, if 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 CI.

Since the value is 2%, the residual halogen concentration of the treated water sample to which the disinfectant is added in the monitoring tank 613 is measured 20 seconds after the disinfectant is added. If this value is higher than the set value of 0.2 mg / L as CI, the disinfectant to be introduced from the disinfectant introduction means 604 is used.

2

If the concentration is lower than 0.2 mg / L as CI, disinfectant introduction means 604

2

Also increase the concentration of disinfectant to put power. The disinfectant input concentration is controlled by inputting the measured value of the residual halogen concentration measuring device 615 through a communication line 604 to a computer (not shown) that has input a preset target value for decreasing the residual halogen concentration. This can be done automatically by using an automatic control device (not shown) that controls the amount of input disinfectant according to the comparison result between the set value and the measured value. The treated water sample for which the measurement of the decrease in residual halogen concentration has been 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, when the liquid to be treated with the disinfectant is short, it stays within 1 minute, and within 10 minutes when it is long, the reaction with the disinfectant proceeds. The treated water that has been sterilized is pumped up by the pump 606 and discharged into the public water area 608 through the drainage channel 607.

In addition, it is preferable to collect the sample to be treated upstream from the disinfectant input position. Take a sample downstream from the disinfectant input position, that is, disinfectant is added If the sample liquid is collected as a sample, the residual halogen concentration at a certain point during the disinfection will be measured, but as shown in Fig. 43, the residual halogen concentration is measured as the elapsed time after adding the disinfectant. This is a force that cannot be adequately controlled because it changes very sensitively.

[0182] According to this embodiment, 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 determined according to the result. adjust. This makes it possible to provide adequate disinfection, especially in the case of disinfecting rainwater overflowing water, whose properties vary greatly over time, and at the same time appropriate disinfection without releasing residual halogen to public water areas. It becomes possible to maintain the agent addition concentration.

[0183] 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. Generally, 1 to: LOmg / L (ppm), preferably Is 2 to 6 mg / L. In the present invention, it is preferable to control the addition amount of the disinfectant within this range.

[0184] As described above, the disinfection tank 603 can have a contact time required for disinfection with a solid bromine-based disinfectant, even if it is not a special reaction tank or a sewer stormwater overflow channel. It ’s good. Here, the contact time required for disinfection with a solid bromine-based disinfectant is set to the maximum overflow rate of the sewer stormwater overflow to be treated, and should be at least 20 seconds, preferably 30 seconds, and more preferably 60 seconds. That's fine. In addition, it is reasonable to set the maximum overflow rate for 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 diversion 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 and rivers may overflow. The present invention does not assume such an extremely heavy rainfall. This is because the quality of sewer stormwater overflow is almost the same as that of rainwater, and it is a force that does not require disinfection. Through various surveys, it is desirable to set the maximum overflow of sewer stormwater overflow as 20 to 10 times the amount of sewage in clear weather. In this way, by clarifying the amount of sewer stormwater overflow to be treated and setting the contact time of the solid bromine-based disinfectant, The size of the sterilization tank or the sewer stormwater overflow channel can be determined.

[0185] In addition, the residual halogen concentration of the treated water to which the disinfectant was added was measured by the rainwater sewer overflow water disinfection device shown in Fig. 44, and if the residual halogen concentration was high, a reducing agent was added to neutralize the treatment water. It is preferable to discharge after performing. The system shown in Fig. 45 shows the treatment method for sewer stormwater overflow with the addition of the disinfectant downstream of the disinfection tank 603 in Fig. 44. The sewer stormwater overflow with the disinfectant 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. If the residual halogen concentration is high, the reducing agent 621 is added and the residual halogen is neutralized in the reduction tank 622. And discharged into public water area 608 via 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. The amount of reducing agent added is sufficient if it 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. Further, 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 treated water in the drainage channel 620 is high. You can also. In this way, the halogen detoxification can be achieved by minimizing the addition amount of the solid bromine-based disinfectant and making the addition amount of the reducing agent excessive.

[0186] 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 disinfectant is based on the predicted values. The amount of addition of can be controlled.

[0187] Conventionally, as a control method for this type of wastewater disinfection device, the inflow amount of wastewater, the inflow pollution load, the rainfall amount, and the rainfall intensity are measured by a measuring device provided in the treatment plant where the wastewater disinfection device is installed. The measured value force was estimated and controlled by estimating the number of E. coli groups in the wastewater flowing into the wastewater disinfection device.

[0188] Fig. 46 is a diagram showing a sewage pipe network that collects sewage such as domestic wastewater and factory wastewater, and a treatment area. Wastewater such as sewage generated in treatment area X, sewage containing rainwater, and rainwater flowing down the ground surface flows into a sewage pipe 711 provided in treatment area X. Each sewer pipe 711 The wastewater that has flowed in joins, and the joined wastewater flows directly into the sewage disinfection device provided in the sewage treatment plant 710 or is sent to the sewage treatment plant by the relay pumps Pl, P2, and P3.

[0189] In one embodiment of the present invention, in such a sewage system, sewage in the treatment area, sewage containing rainwater, drainage containing rainwater flowing down the surface, etc., particularly sewer stormwater overflow is disinfected with chemicals. In the control method of the disinfection device, the measurement point provided in the treatment area or the measurement point force provided in the treatment area and the adjacent treatment area Rainfall information is collected and the rainfall start time, rainfall in the treatment area Predict the total amount and the duration of rainfall, and control the drainage disinfection device by predicting the amount of medicine added, the amount of medicine consumed, and the start time of the drainage disinfection device from the predicted rainfall start time, total precipitation amount, and rainfall duration. .

[0190] When such a method for controlling a disinfection device is adopted, the rainfall information collected from the measurement points provided in the treatment area or the measurement points provided in the treatment area and the adjacent treatment area. Because it predicts the rainfall start time, total rainfall amount, and rainfall duration time in, it is possible to predict the amount of drug added, the amount of drug consumed, and the start time of drainage disinfection equipment in real time.

[0191] Further, according to another embodiment, the control device of the disinfection device that disinfects the sewage in the treatment area, the sewage including the rainwater, the drainage including the rainwater flowing down the surface of the ground, etc., in particular, the sewer sewage overflow water in the rain From the rainfall information measurement means that measures the rainfall information of the treatment area or the treatment area and the adjacent treatment area, and the rainfall information measured by the rainfall information measurement means, the rainfall start time and the total amount of rainfall in the treatment area And rainfall information prediction processing means for predicting the rainfall duration, and the amount of medicine added, the amount of medicine consumed, and the start of drainage disinfection from the rainfall start time, the total amount of rainfall and the rainfall duration predicted by the rainfall information prediction processing means. An E. coli group number prediction processing means for predicting the time can be provided.

[0192] As described above, the control device of the wastewater disinfection device includes the rainfall information measuring means for measuring the rainfall information of the treatment area or the treatment area and the adjacent treatment area, the rain start time in the treatment area, the rainfall from the rain information. Prediction method of rainfall information to predict the total amount and the duration of rainfall, the rain start time, the total amount of rainfall and the duration of rainfall, the amount of drug added, the amount of drug consumed, and Since the E. coli group number prediction processing means for predicting the operation start time of the sterilizer is provided, it is possible to predict the amount of added drug, the amount of drug consumption, and the operation start time of the waste water sterilizer in real time.

[0193] According to another aspect, in the above-described disinfection device control apparatus, the regional characteristics for predicting the inflow water amount and inflow pollution load of the wastewater flowing into the wastewater disinfection device from the rainfall information measured by the rain information measuring means It is possible to provide a prediction value correction processing means for correcting the amount of added medicine, the amount of medicine consumed, and the operation start time of the drainage disinfection device based on the inflow water amount and the inflow pollution load predicted by the simulation means and the regional characteristic simulation means. .

[0194] Since the inflow water amount and the inflow pollution load predicted by the regional characteristic simulation means are provided with the predicted value correction processing means for correcting the drug addition amount, the drug consumption amount, and the disinfection device operation start time, the drug It is possible to predict the addition amount, chemical consumption, and drainage disinfection start time more accurately.

[0195] According to still another embodiment, the control device of the disinfecting apparatus includes turbidity measuring means for measuring the inflow turbidity of the water to be treated flowing into the disinfecting apparatus, and the rain information prediction processing means From the predicted rainfall start time, total rainfall amount and duration of rainfall, and 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.

[0196] The amount of drug added, the amount of drug consumed, and the disinfection device based on the rainfall start time, the total amount of rainfall, the duration of rainfall, and the inflow water turbidity measured by the turbidity measuring means predicted by the rainfall information prediction processing means. Since the operation start time is predicted, the drug addition amount, the drug consumption amount, and the drainage disinfection device operation start time can be predicted more accurately.

[0197] According to still another aspect, the present invention provides a control device for a disinfection device that disinfects wastewater including sewage in a treatment area, sewage including rainwater, rainwater flowing down the surface of the earth, etc., particularly sewer stormwater overflow with chemicals. The amount of inflow of wastewater that flows into the wastewater disinfection device from the rainfall information measurement means that measures the rainfall information of the treatment area or the treatment area and the adjacent treatment area, and the rainfall information measured by the rain information measurement means And regional characteristic simulation means for predicting inflow pollution load, and chemical addition rate setting means for setting the chemical addition rate for wastewater in advance In addition, the amount of influent water predicted by the regional characteristic simulation means, the inflow pollution load, and the amount of drug addition set by the means for setting the drug addition rate, and the amount of drug added and the amount of drug consumed are predicted. Means can be provided.

[0198] 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 amount of influent water flowing into the waste water disinfection device and the inflow pollution load are predicted from the rain information. Predicting the amount of drug added and the amount of drug consumed from the inflow water amount, the inflow pollution load and the drug addition rate. Since the medicine addition amount calculation processing means is provided, it is possible to predict the medicine addition amount and the medicine consumption amount in real time with a simple configuration.

[0199] According to another embodiment, in the control device for any one of the above-described disinfection apparatuses, the amount of rainfall in the treatment facility where the disinfection apparatus is installed, the rainfall intensity, the amount of inflow water to be treated flowing into the disinfection apparatus, Measured value measurement means is provided to measure the amount of drug supplied to the disinfection device and the concentration of residual drug discharged from the disinfection device. It comprises an actual value correction processing means for correcting the consumption amount and the prediction of the disinfection device operation start time.

[0200] 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 based on the measurement values measured by the actual value measurement means is provided, the drug addition amount In addition, the drug consumption and the disinfection device operation start time can be predicted more accurately.

[0201] FIG. 47 is a diagram showing a sewage pipeline network that collects waste water to be sterilized by the disinfecting apparatus of the embodiment described above, a treatment area, and an adjacent treatment area. As shown in Fig. 47, treatment areas A, B, C, D, and E with similar sewage treatment plants around treatment area X of 710 sewage treatment plant 710 where sewage overflow water disinfection equipment is installed. Are adjacent to each other. Note that the basic configuration of the sewer network in this embodiment is the same as that of the sewer network shown in FIG.

[0202] FIG. 48 is a diagram showing a configuration example of the control device of the wastewater disinfection device according to the present invention. As shown in the figure, a plurality of rainfall information measuring means 720, 720. Thus, the rainfall information measuring means 720, 720,... Can measure the rainfall information 721a, 722a˜ in the processing area A. 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 where a relay pump in 1S treatment area A is omitted. For other treatment areas B, C, D, E, and X, rainfall information such as rainfall and rainfall intensity in each treatment area is measured using the same rainfall information measurement means. The rainfall information measured in each processing area A, B, C, D, E, X is continuously or periodically sent to the control device 730 using a data transmission device or an AMeDAS system using a commercially available telephone line. To be transmitted.

[0203] Figure 49 shows the mapping process used in the control method for sewer overflow water disinfection equipment in rainy weather. Figure (a) is measured in each treatment area A, B, C, D, E, X. (B) is a schematic diagram after elapse of time t in FIG. (A). The rain information from the processing areas A, B, C, D, E, and X input to the control device 730 is subjected to mapping processing by the rain information mapping processing means 731 into a schematic diagram as shown in FIG. The The rainfall information measured in each treatment area A, B, C, D, E, and X is transmitted to the control device 730 continuously or periodically. It will be a schematic diagram as shown in Fig. 49 (b) later. Note that the rainfall information that has been mapped is represented by the intensity of rainfall intensity as shown by A! /.

[0204] Next, the time series of rainfall information that was transmitted continuously or periodically and mapped

(See Fig. 49) Prediction of rainfall start time, total amount of rainfall, and rainfall duration in processing area X from rainfall information estimation processing means 732. Further, the rainfall information estimation processing means 73 2 calculates the predicted rainfall 733, the predicted rainfall intensity 734, and the amount of water flowing into the disinfection device from the predicted rainfall start time, total rainfall, and rainfall duration, at the treatment plant 710 in the processing area X. Calculate the estimated inflow 735 of treated water. The calculated expected rainfall 733, expected rainfall intensity 734, and expected inflow 735 are input to known coliform group number estimation processing means 736. In addition, the turbidity 751 of the influent water 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.

[0205] The coliform group number estimation processing means 736 estimates the number of coliform groups from the input predicted rainfall 733, predicted rainfall intensity 734, predicted inflow 735, and inflow turbidity 751 and Estimate the required amount of added medicine 736a, consumed amount 736b, and drainage disinfection start time 736c.

[0206] Next, from the measured value measuring means 752 provided in the sewage treatment plant 710 of the treatment area X, the rainfall amount 753, the rainfall intensity 754, the inflow amount of wastewater flowing into the wastewater disinfection device 755, the wastewater at the treatment plant 710 Measure the chemical supply amount 756 of halogenated chemicals supplied to the disinfection device and the concentration 757 of the residual chemicals in the discharged water discharged from the wastewater disinfection device. The measured rainfall amount 753, rainfall intensity 754, influent water amount 755, chemical supply amount 756, and discharge water residual chemical concentration 757 are input to the predicted value Z actual measurement value correction processing means 737.

[0207] Predicted value Z actual measurement value correction processing means 737 includes the above 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 Find the correction value to correct each predicted value of consumption 736b and drainage disinfection start time 736c. Each of the obtained correction values is added to the correction value addition processing means 737a, 737b, 737c, and the addition amount 736a, the consumption amount 736b of the medicine and the start time 736c of the waste water disinfection device are added, and the addition amount 741 of the addition medicine, Consumption 742 and drainage disinfection start time 743 are required.

[0208] The control device 730 operates the drainage disinfection device based on the predicted values of the drug addition amount 741, the chemical consumption amount 742, and the drainage disinfection device operation start time 743 obtained by adding the correction values. Control the amount of drug added and the amount of drug consumed. The drug addition amount 741 is used for real-time control of drug addition as the actual drug addition amount setting value of the waste water disinfection device. The chemical consumption 742 is compared with the amount of chemicals stored in the treatment plant 710, and if there is a shortage of chemicals to be added to the wastewater disinfection device, an alarm is issued to the operator. Used to seek drug replacement. The drainage disinfection operation start time 743 is used to inform the operator of the drainage disinfection operation start time and as an automatic operation start command for the drainage disinfection apparatus.

[0209] As described above, the rainfall information estimation processing means 732 is based on the rainfall information measured by the rainfall information measuring means 20 in each processing area A, B, C, D, E, and X. Prediction of rainfall start time, total amount of rainfall, and duration of rainfall in X, as well as calculating expected rainfall 733, expected rainfall intensity 734, and expected inflow 735 at treatment plant 71 0 in treatment area X. E. coli group number estimation processing means 73 6 estimates the number of coliforms from rainfall 733, expected rainfall intensity 734, expected inflow 735, and the amount of drug added necessary for controlling the drainage disinfection device 7 36a, drug consumption 736b And by predicting the start time 736c of the drainage disinfection device, each predicted value can be predicted in real time.

[0210] In addition, E. coli group number estimation processing means 736 has an estimated rainfall of 733, an estimated rainfall intensity of 734, an estimated inflow of 735, and an influent water turbidity of 751. Therefore, it is possible to predict each predicted value more accurately.

[0211] Furthermore, the predicted value Z 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 chemical supply amount 756, and the residual chemical concentration 757 of the discharge water, and the correction value calorie calculation processing means In 737a, 737b, and 737c, the respective correction values are added to the drug addition amount 736a, the drug consumption amount 73 6b, 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. Therefore, each predicted value can be predicted more accurately.

FIG. 50 is a diagram showing 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.

[0213] Rainfall information 721χ, 722χ ··· such as rainfall amount and rainfall intensity measured by each 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 Are input to the regional characteristic simulation means 760. 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, by inputting the above rainfall information 721χ, 722χ ···, hydraulic 'water quality analysis is performed.

[0214] The regional characteristic simulation means 760 obtains the expected inflow amount 761 of the wastewater flowing into the wastewater disinfection device and the expected inflow pollution load 762 in the rainfall information power in the treatment area X. The calculated expected inflow water volume 761 and expected inflow pollution load 762 are stored in the measured value measuring means 752. In addition to the measured rainfall amount 753, rainfall intensity 754, inflow water amount 755, drug supply amount 756, and discharge water residual drug concentration 757, it is input to the predicted value Z actual value correction processing means 737.

[0215] Predicted value Z measured value correction processing means 737 is the input rainfall amount 753, rainfall intensity 754, inflow water amount 755, drug supply amount 756, effluent water residual drug concentration 757, expected inflow amount 761 and forecast inflow From the pollutant load 762, find correction values to correct the drug addition amount 736a, drug consumption amount 736b, and disinfection device operation start time 736c. The correction values are added to the predicted values of the added amount of medicine 736a, the amount of medicine consumed 736b and the operation start time 736c of the waste water disinfection device from the Escherichia coli group number estimation processing means 736 in the correction value addition processing means 7 37a, 737b, 737c. After processing, the predicted values of the drug addition amount 741, the drug consumption amount 742, and the drainage disinfection 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.

[0216] As described above, the predicted value Z actual value correction processing means 737 uses the regional characteristic simulation means 760, the expected inflow water amount 761 and the expected inflow pollution load 762 from the added amount of medicine 736a, the chemical consumption amount 736b, and the drainage disinfection device. A correction value for correcting the operation start time 736c is obtained, and each correction value is added to the correction value addition processing means 737a, 737b, 737c from the E. coli group number estimation means 736, the drug addition amount 736a, the drug consumption amount 736b, and the disinfection device operation start. By performing addition processing at time 736c, the drug addition amount 741, the drug consumption amount 742, and the disinfection device operation start time 743 are obtained, so that each predicted value can be predicted more accurately.

[0217] In the above embodiment, a 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. The rainfall information of the processing area X and the adjacent processing areas A, B, C, D, and E may be input without limitation.

FIG. 51 is a diagram showing another configuration example of the control device of the disinfection device. First, the rainfall information 72 1χ, 722χ..., Such as 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.

[0219] The regional characteristic simulation means 760 obtains the estimated inflow amount 761 of the treated water flowing into the disinfection device and the expected inflow pollution load 762 from the rainfall information in the treatment area X. The calculated expected inflow water volume 761 and expected inflow pollution load 762 Input to means 738.

[0220] Also, the medicine addition amount calculation processing means 738 is inputted with the medicine addition rate 739a set in advance by the medicine addition rate setting means 739 for setting the medicine addition rate for the waste water flowing into the sterilizer. ing. 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, expected inflow water amount 761, and expected inflow pollution load 762.

[0221] From the measured value measurement means 752 installed in the treatment plant 710 in the treatment area X, the amount of rainfall 753, the rainfall intensity 754, the amount of incoming water 755, the amount of chemical supply 756, the concentration of residual chemical in the effluent 757 Measure. The measured rainfall amount 753, rainfall intensity 754, inflow water amount 755, drug supply amount 756, and discharged water residual drug concentration 757 are input to the predicted value Z actual value correction processing means 737 of the control device 730.

[0222] Predicted value Z actual measurement value correction processing means 737 receives the correction values for correcting predicted values of the drug addition amount 736a and the drug consumption amount 736b from the drug addition amount calculation processing means 738. Calculated from rainfall intensity 754, influent water volume 755, chemical supply volume 756, and residual water chemical concentration 757. The respective correction values are added to the respective predicted values of the drug addition amount 736a and the drug consumption amount 736b from the drug addition calorie amount calculation processing means 738 by the correction value addition processing means 737a and 737b, and the drug addition amount 741 and the drug consumption are calculated. Find the amount 742. The control device 730 controls the waste water disinfection device based on the drug addition amount 741 and the drug consumption amount 742.

[0223] As described above, the rainfall information 721x, 722x ... force measured by each rainfall information measuring means 720 in the treatment area X is calculated by the regional characteristic simulation means 760 to obtain the expected inflow water quantity 761 and the expected inflow pollution load 762, The drug addition amount calculation 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 73 9a set by the drug addition rate setting means 739. Predicted values can be predicted in real time.

[0224] 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. However, it is also possible to input rainfall information for processing area X and adjacent processing areas A, B, C, D and E. [0225] In addition, the above describes the form of disinfecting sewer stormwater overflow at a sewage treatment plant. However, it is raining at a sewer stormwater overflow drainage facility such as a rainwater spout chamber or pumping station (drainage station). The above control device can also be applied to the form of disinfecting sewer overflows.

[0226] Further, the rainwater sewer overflow water disinfecting apparatus according to the present invention has an abnormality detection mechanism (solid bromine-based disinfectant addition amount detection means) capable of detecting an excess or an excess of the solid bromine-based disinfectant addition amount. You can get rid of it.

[0227] The solid bromine-based disinfectant addition amount detection means that can be used in the present invention includes the residual halogen concentration measured in the water to be treated immediately after the addition of the solid bromine-based disinfectant, and the treatment to which the disinfectant is added. Excessive and Z or under-detection of halogenated chemicals is detected by comparing the residual halogen concentration measured in the discharge channel where water is discharged with a predetermined threshold V ヽ value and / or comparing both residual halogen concentrations. It is means to do. 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 value, the amount of addition of the halogen-based chemical is excessive or too small. Detect. Also, compare the residual halogen concentration measured in the treated water immediately after the addition of the halogen-based chemical with the residual halogen concentration measured in the discharge channel, and set the disinfectant consumption in advance using the concentration difference as the disinfectant consumption. The disinfectant consumption is low, if it is lower than the value, and if it is less than the value, it is consumed! Therefore, it is detected as an excessive amount of halogenated chemical additive.

[0228] In addition, the solid bromine-based disinfectant addition amount detection means detects the excess of the solid bromine-based disinfectant addition amount by comparing the solid bromine-based disinfectant possession amount (consumption amount determined consumption amount) with the discharge amount. And a means to detect Z or under. In other words, the ratio of the error between the actual consumption obtained from the difference in the amount of solid bromine-based disinfectant possessed and the discharge rate measured with a measuring device such as the rotation speed or flow meter is set in advance! High and low level of the amount of added medicine discharge! When the threshold (ratio) is exceeded, it is detected as an excessive or too small amount of drug added.

[0229] 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. That is, the image supervisor The number of individuals that are determined to be drifting due to the death or weakness of the fish is set in advance! Judge as excessive and 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, a powder state This method uses a solid bromine-based disinfectant, dissolves in water to form disinfecting water, and adds it to the water to be treated. The following apparatus configuration can also be applied to the disinfectant storage and supply apparatus of the various forms described above and the disinfection apparatus of the type in which the solid bromine-based disinfectant is fed into the treated water in the solid state. . In the following explanation, the form of disinfection of sewer stormwater overflow in a sand basin is explained, but various forms of disinfection in the flow path of sewer stormwater overflow as described above are also described. It can be applied.

[0231] In FIG. 52, reference numeral 810 denotes a sand basin into which the sewer stormwater overflow flows and flows out, which is sterilized by the disinfection device. A part of the sewer stormwater overflow that flows into the inflow 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. 830 pieces of equipment are sent.

[0232] In the disinfectant addition device 830, the solid bromine-based disinfectant 832 charged in the hopper 831 is supplied to the ejector 834 from the supply unit 833 to the ejector 834 by driving the motor Ml 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 is stirred by the stirrer 842 driven by the motor M2, so that the disinfectant is reliably dissolved, and then the water in the sand basin 810 is pumped by the pump P2. By returning to the inflow section 810a, the water to be treated is sterilized, and is discharged from the discharge channel 811 to the public water area 812 such as a river through the sand settling section 810b.

[0233] In the apparatus described below, three types of abnormality detection means are installed in order to quickly and surely prevent excessive sterilization or disinfection failure of treated water when performing the above-mentioned disinfection. . In other words, there are provided means for detecting whether the amount of drug addition is excessive or too small, means for monitoring whether the drug addition has been executed reliably, and means for complementing the determination of excess drug addition. ing. This will be described below.

[0234] When performing disinfection, it is necessary to detect excess or under-loading of chemicals in order to prevent excessive disinfection or disinfection of treated water. Therefore, the residual halogen concentration meters 813 and 843 are installed in the discharge channel 811 and the dissolution apparatus 840, respectively, and the measured values of both are input to a computer (or an electric circuit) (not shown), and the chemical procedure with chemicals is performed according to the processing procedure shown in FIG. Detect excess or underdose.

That is, in FIG. 53, first, the residual halogen concentration in the discharge water channel 81 1 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. Then, in the residual halogen concentration determination process flow of FIG. 53, first, the residual halogen concentration in the discharge water channel 811 measured by the residual halogen concentration meter 813 is set in advance, and then the residual halogen concentration in the discharged water reaches a high level. If it exceeds the value 901 and exceeds this value, it is determined that the chemical is excessively added, and a high residual halogen level determination output 870 is output.

[0236] Next, the residual halogen concentration in the dissolution apparatus 840 measured by the residual halogen concentration meter 843 is set in advance, and the dissolution tank residual halogen concentration threshold is lower than the value 902. If it is less than 902, it is judged that the chemical has been added too little, and the residual halogen low level judgment output 871 is output. Next, the residual halogen concentration in the dissolution apparatus 840 is set in advance, and the dissolution tank residual halogen concentration is set to a high level compared to the value 903. The residual halogen high level judgment output 870 is output.

[0237] Further, the difference between the residual halogen concentration in the dissolution apparatus 840 measured by the residual halogen concentration meter 843 and the residual halogen concentration in the discharge channel 811 measured by the residual halogen concentration meter 813 is regarded as the disinfectant consumption. If the disinfectant consumption is set in advance and the residual halogen concentration difference (disinfectant consumption) is low, the threshold is low compared to the value 904. Judgment is made and the residual halogen high level judgment output 870 is output. In other words, the amount of disinfectant to be sterilized increases its consumption, so the amount of disinfectant consumption is low. However, you are adding more disinfectant than necessary. Thus, even if the melting device 8 Even if the residual halogen concentration at 40 and the residual halogen concentration in the discharge channel 811 are individually within the prescribed allowable values, it is determined that more disinfectant than necessary is added.

[0238] 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 wastewater immediately after the addition of the halogen-based chemical agent) and the residual halogen concentration measured in the discharge channel 8 11 downstream thereof. By comparing the concentration with a preset threshold value of residual halogen concentration, etc., it is possible to determine whether or not the drug is added excessively or too little. There is no time delay to the point, and it is possible to quickly and surely determine whether the drug is excessive or too small. Moreover, 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.

[0239] In performing disinfection, it is necessary to monitor that drug addition is being performed reliably. Therefore, the hopper weight meter XI provided in the hopper 831 of the disinfectant addition device 830 is used to measure the weight 35 of the hot bar and the rotation speed 36 of the motor Ml. When input is made, it is monitored that the drug addition has been executed reliably according to the procedure shown in Fig. 54.

That is, in the medicine discharge amount determination processing flow of FIG. 54, first, the time is set in advance for the supply number of rotations 836 sampled k + 1 times in the medicine discharge amount determination processing sampling period 913 set in advance [ Number-Discharge rate conversion factor] The ratio between the powder drug discharge amount obtained by counting 910 and the powder drug consumption amount for which the differential force of hopper weight 835 at time t and time t + k is also set in advance. If the drug discharge amount addition level is low, and the value is less than 911, it is determined that the drug addition amount is too low, and the drug addition amount underdetermination output 881 is output. In other words, the amount of powder medicine consumed, which also obtained the difference force of the hot weight 835, should be the same as the amount of powder medicine discharged from the rotating speed 836 of the feeder, but the powder medicine obtained from the difference of the hopper weight 835 The fact that the amount of powdered drug discharge determined from the feeder rotation speed 836 is larger than the amount of consumption means that the amount of powdered drug discharge determined from the supply machine rotation speed 836 is greater than the discharge volume actually discharged. However, the amount of powder medicine discharge can be obtained depending on the rotational speed of the feeder 836 determined to obtain the predetermined amount of powder medicine discharge. This means that it is necessary to increase the number of revolutions further, or that the prescribed powder medicine discharge amount cannot be obtained due to a mechanical failure of the feeder 833, that is, the medicine addition amount is too small. become.

[0241] On the other hand, if the ratio between the powder drug discharge amount and the powder drug consumption amount is equal to or higher than the preset drug discharge amount addition level high threshold 912, it is determined that the drug addition amount is excessive. Then, the medicine addition amount excess judgment output 882 is output. If neither condition is met, no output is made.

[0242] By comparing the powder drug discharge amount and the powder drug consumption amount in this way, it is possible to monitor whether or not the drug addition has been reliably executed in real time.

[0243] Even when the residual halogen concentration meter of the disinfection device becomes abnormal in measurement, and it is impossible to determine whether chemicals are excessively added or too small, it is necessary to perform the disinfection. It is possible to execute the fish habitat state determination process for the discharge channel using the image processing technology shown in 55.

[0244] That is, the outlet monitoring camera 814 is installed at the outlet of the outlet channel 811. In the fish abnormality determination processing flow shown in Fig. 55, the video data of the outlet monitoring camera 814 and the preset fish judgment are set. Pattern comparison with pattern 921 is performed, and similar video patterns are determined to be fish inhabiting discharge channel 811. Then, for each image pattern judged to be fish, two fish drift detection movement range coordinates 922 and 923 indicating the movement range of the fish are determined from the first detected coordinates, and judged as fish. If the image pattern exists within the coordinate range (the range enclosed by the dotted line) for a time exceeding the time set in the fish drift determination time 924, the fish drifts by dying or weakening V, It is judged as a fish. The above determination process is performed for all video patterns that have been determined to be fish ヽ, drifted! / Pre-set number of fish to be struck! If it exceeds 925, it is determined that the drug has been added excessively, and a fish abnormality determination output 890 is output.

[0245] The output 870, 871, 881, 88 2, 890 regarding the excess or under-determined amount of the drug determined as described above can be used for the purpose of notifying the operator of the disinfection device as an alarm, or It is used for the purpose of executing automatic control to increase or decrease the amount of drug input according to the excessive or too small amount of drug added, or when the drug is excessively added, It can be used for the purpose of suspending movement or automatically injecting a neutralizing agent.

[0246] As shown in Fig. 56, when the solid bromine-based disinfectant storage tank 951 is installed on a scale (load cell) 953 and the disinfectant supply speed becomes abnormally high due to a failure of the cutting device 952 In addition, when the abnormal supply is detected by the detector 956 and the emergency supply stop device 955 is activated to stop the supply of the solid bromine disinfectant from the supply pipe 954, the solid bromine disinfectant becomes abnormal. A large amount can be supplied to prevent the surrounding halogen from deteriorating the environment around the outlet.

[0247] Examples of the operation method of the apparatus for disinfecting sewer stormwater overflow with a solid bromine-based disinfectant according to the present invention include the following methods. Sewer overflow in the rainy target to be treated Hydropower In the case of overflow water from a combined sewer or a 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 sewage pipe 961 and the amount increases, the movable gate 962 is opened and the sewage mixed with stormwater overflows (sewage overflow in rainy weather). Overflow water is stored in a sand basin or rainwater storage facility 963 and flows into the pump well 972 through a screen 971. A rainwater pump is installed in the pump well 972, and the rainwater pump 964 is activated after the movable gate 962 is opened and the force has been applied for a predetermined time, and the sewer stormwater overflow in the sand basin or rainwater storage facility 963 is discharged. It is guided to the discharge channel 965 and discharged from the 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 workers in the central monitoring room based on various types of weather information, such as rainfall probability, rainfall information, and rainfall. In such a case, when the movable gate 962 is activated and sewer stormwater overflow flows into the sand basin or rainwater storage facility 963, first, the pump 967 is moved to remove some of the sewer stormwater overflow. It can be taken out and mixed with the solid odor disinfectant 968 in the mixing device 969 to adjust the disinfecting water, which can be put into a sand basin or rainwater storage facility 963. At this time, a predetermined amount of solid bromine-based disinfectant calculated from the capacity of the settling basin or rainwater storage facility 963 can be added in advance to disinfect sewer stormwater overflow that accumulates in the settling basin or rainwater storage facility 963. . Then rainwater po When the pump 964 is activated and the discharge of sewer stormwater overflow into the public water area begins, the disinfectant supply amount is controlled so that an appropriate amount of solid bromine-based disinfectant is introduced in accordance with the overflow water flow rate. can do. In addition, in Fig. 57, a force showing a method of dissolving solid bromine-based disinfectant in water to form disinfecting water and throwing it into sewer overflow water during rainy weather Solid bromine-based disinfectant remains solid It is also possible to use a method of throwing it into the sewer stormwater overflow in the sand basin. Such control includes the amount of water, residual halogen concentration, discharge gate (movable gate) open signal, rainwater pump operation signal, etc. in sewer stormwater overflow drainage facilities such as pump stations, sewer pipes, and sewage treatment plants. It is preferable to send the monitored value to a remote management facility such as a central control room and control it remotely at the management facility. In other words, it is preferable that the disinfectant input can be controlled unattended at the site of the drainage overflow drainage facility in rainy weather. Figure 58 shows the concept of such a control system.

[0248] According to the control system shown in FIG. 58, the control of the bromine disinfection device is controlled by the accompanying power control panel 10.

This is done automatically by a control unit such as a sequencer built in 02.

[0249] The chemical feeder 1003 is a powder fluidizer (including a load cell), a powder fluidizer, and a chemical feeder.

It consists of a melting cone and attached valves.

[0250] Raw water turbidity meter 1004 always outputs the turbidity of incoming raw water.

[0251] Dissolved water flow meter 1005 always outputs the amount of water supply for chemical dissolution.

[0252] Residual halogen meter 1007 always outputs the residual halogen concentration of the discharged water.

[0253] In the power control panel 1002, the following control is performed.

• Injection volume control: Takes the data of “discharged water” from the central operation room 1001 and the “rotation speed” data from the feeder attached to the chemical feeder 1003, converts this into “powder feed”, and converts the water volume Control is performed so that the injection rate is kept constant with respect to the change and the injection is performed appropriately.

• 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, excessive injection Control to prevent this.

• Injection rate calculation control: The turbidity data from raw water turbidity meter 1004 and the data of “discharge flow rate”, “rainfall intensity” and “rainfall” are taken from central operation room 1001, and coliform bacteria contained in raw water Calculate the number, determine the dose (rate), and perform injection control. • Operation sequence management: For auxiliaries 1006, for example, “Synchronized operation” command for dust collector, “Opening / closing” of gate for CS O discharge facility 1008, etc.

• Injection determination: The amount of powder supplied to the chemical feeder 1003 is calculated from the number of revolutions of the feeder, but this alone cannot detect idle operation due to a bridge. Therefore, the powder fluctuation weight is measured with the load cell of the powder flow section where chemicals are stored, and the consistency is determined by comparing with the calculated value from the rotation speed.

• Record each data: Record instrumentation measurements, failure histories, etc. with a recorder in the panel.

[0254] If necessary, the operation mode, status display, and various data are sent to the central operation room 1001 so that the operation can be monitored from the central operation room.

[0255] 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, after the start of operation, the injection rate of the disinfectant is divided into 4 stages of 0 to 1 hour, 1 to 3 hours, 3 to 5 hours and 5 hours to 10 mg / L, 7 mg / L, 5 mg / L and 3 mg, respectively. It can be gradually reduced like / L. The number of additional stages, the length of each stage, the disinfectant injection rate at each stage, etc. can be changed as appropriate based on information such as rainfall, rainfall type, and rainfall forecast. For example, an addition program of several patterns can be set in advance, and the 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, the supply is stopped or the disinfectant Assuming a case where the supply device is stagnant due to a bridge, etc., if the weight of the disinfectant storage tank does not change for a certain period of time, an alarm is issued, or the disinfectant-dissolved water is dissolved in the dissolution cone at the top of the ejector. Provide a mechanism to detect when the force also flows backward, stop supplying by detection, or detect a shortage of disinfectant dissolved water supply amount, that is, provide a lower limit detection mechanism for electromagnetic flowmeters, and dissolve by detecting abnormalities. It is preferable to perform control such as closing the water supply valve to prevent backflow. Various aspects of the present invention are as follows.

1. a disinfection facility with a disinfection tank that disinfects sewage with chlorine or UV;

A sewage treatment apparatus, wherein 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 sewage lcc by the 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 sewage lOOcc by a disinfection facility.

4. The sewage treatment device according to claim 1, wherein the entrance of the branching device is connected to the combined sewer system!

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 lcc of sewage.

6. The sewage treatment apparatus according to claim 1, wherein the bromine sewage treatment apparatus reduces the number of E. coli in sewage to 200 or less per sewage lOOcc.

7. The sewage treatment device according to claim 1, wherein sewage sterilized by the disinfection facility and Z or bromine sewage treatment device is allowed to flow into public water areas.

8. The disinfection facility has 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 1. A sewage treatment apparatus according to item 1.

9. The disinfection facility further has a first settling basin, a flapping tank, and a final settling basin, and the sewage introduction section of the first sedimentation basin is connected to the introduction part of the disinfection facility, and the outlet of the first sedimentation basin is the sewage of the batting tank. It is connected to the introduction part, and the outlet of the batting tank is connected to the sewage introduction part of the final sedimentation basin. The sewage treatment apparatus according to claim 1, wherein an outlet of the sedimentation basin is connected to a sewage introduction section of the disinfection tank.

10. The disinfection facility

First settling basin,

A branching device that has an inlet, outlet 1 and outlet 2 and receives the effluent water from the first sedimentation basin at the inlet and divides it into outlet 1 and outlet 2, and the amount of water flowing into the branching device is below a predetermined value. The total amount of influent water flows to outlet 1, and when the amount of influent water is greater than or equal to a predetermined value, the predetermined amount of water flows to outlet 1, and the amount of inflow water volume excluding the predetermined amount of water flows to outlet 2. Equipment,

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, the outlet 1 of the branching device is connected to the sewage introduction part of the disinfection tank, and 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,

A bath tank,

The final sedimentation basin,

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 flapping tank. The outlet of the attached tank is connected to the sewage introduction section of the final sedimentation basin, the exit of the final sedimentation basin is connected to the sewage introduction section of the disinfection tank, and the outlet 2 of the branch device is the sewage of the bromine sewage treatment system. The sewage treatment apparatus according to claim 1, wherein the sewage treatment apparatus is connected to the introduction section.

12. A sewage treatment device in a sewage treatment plant,

First sedimentation basin;

A sewage treatment apparatus characterized in that outlet 1 of the branching device is connected to the sewage introduction part of the disinfection facility, and outlet 2 of the branching apparatus is connected to the sewage introduction part of the sewage treatment apparatus. 13. A sewage treatment device in a sewage treatment plant,

First sedimentation basin;

Batsukiro;

The final sedimentation basin;

A branch device that has an inlet, outlet 1 and outlet 2 and receives the effluent from the first sedimentation basin at the inlet and divides it into outlet 1 and outlet 2. A diverter that flows a predetermined amount of water to outlet 1 and flows the predetermined amount of water to outlet 1 when the amount of inflow water is greater than or equal to the predetermined value. 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 entrance of the branching device, and the outlet 1 of the branching device is connected to the sewage introduction part of the flapping tank. The outlet of the batting 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 the sewage introduction part of the bromine sewage treatment device. A sewage treatment apparatus characterized by being connected to the sewage treatment apparatus. 14. The bromine sewage treatment equipment adds the solid bromine-based disinfectant storage / supply device and the solid bromine-based disinfectant storage / supply device to the treated water. The sewage treatment apparatus according to any one of claims 1 to 13, further comprising a disinfectant addition 'mixing apparatus for mixing.

15. The solid bromine-based disinfectant storage and supply device includes a solid bromine-based disinfectant storage tank and a quantitative feeder for measuring and discharging a predetermined amount of the solid bromine-based disinfectant in the storage tank. 15. The sewage treatment apparatus according to claim 14, wherein the quantitative feeder 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 metering feeder includes a rotary table having a weighing means.

17.Disinfection addition The sewage treatment apparatus according to claim 14.

18. The disinfection device according to claim 17, wherein the disinfectant addition / mixing device 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 is connected to the storage tank for storing the solid bromine-based disinfectant and the storage tank to transfer the disinfectant as solid to the injection point. A disinfectant transfer pipe connected to the disinfectant transfer pipe, and a disinfectant injection device for adding the solid bromine-based disinfectant transferred through the pipe to the water to be disinfected. 14. Disinfection device according to 14.

20. The disinfection device according to claim 14, wherein the disinfectant completely dissolves before reaching the discharge position of the water to be treated.

21. Further, a preparative line for collecting a sample of water to be treated, a disinfectant supply means for adding a disinfectant to the sampled sample of water to be treated, and water to be treated with a disinfectant added An effective halogen concentration measuring device for measuring the effective halogen concentration of a sample, and adding a disinfectant according to the degree of decrease in the effective halogen concentration in the water sample to be treated after adding the disinfectant measured by the effective halogen concentration measuring device. 'A disinfectant addition amount control means is provided to control the amount of disinfectant added to the water to be treated by the mixing device. 15. A sewage treatment apparatus according to claim 14.

22. Furthermore, a reducing agent supply device for adding a reducing agent to the treated water after adding the disinfectant, an effective halogen concentration measuring device for measuring the effective halogen concentration in the treated water after adding the disinfectant, 15. The sewage treatment apparatus according to claim 14, further comprising a reducing agent addition amount control device that controls the addition amount of the reducing agent according to the measured effective halogen concentration in the treated water after the addition of the disinfectant.

23. A method for disinfecting sewage,

Inflow sewage is disinfected with chlorine or UV when the inflow sewage is below the specified value, and when the inflow sewage is over the predetermined value, the sewage with the specified value is supplied with chlorine or UV. A sewage treatment method comprising disinfecting and simultaneously removing a predetermined amount of sewage from the inflow sewage, and disinfecting the sewage with a bromine-based disinfectant.

24. The method according to claim 23, wherein the number of coliforms in sewage is reduced to 3000 or less per lcc 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 sewage lOOcc 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 lcc of sewage by disinfection with a bromine-based disinfectant.

28. The method according to claim 23, wherein the number of E. coli in sewage is reduced to 200 or less per sewage lOOcc by disinfection with a bromine-based disinfectant.

29. The method according to claim 23, wherein sewage sterilized by chlorine or UV and sewage sterilized by Z or bromine-based disinfectant are run into public water bodies.

30. The method according to claim 23, wherein the disinfection time with the bromine-based disinfectant is 3 minutes or less.

31. The method according to claim 23, wherein a solid bromine-based disinfectant is added to the water to be treated as a bromine-based disinfectant and mixed for disinfection.

32. 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. Do 24. The method of claim 23.

33. The method according to claim 23, wherein the disinfectant is completely dissolved by the time it arrives at the site where the treated water is discharged.

34. Add a bromine-based disinfectant by sampling a part of the water to be treated, adding a bromine-based disinfectant, and measuring the effective halogen concentration of the sample-treated water to which the bromine-based disinfectant was added. 24. The method according to claim 23, further comprising controlling the amount of bromine-based disinfectant added to the water to be treated according to the degree of decrease in effective halogen concentration in the subsequent water sample to be treated.

35. The effective halogen concentration in the treated water after adding the bromine-based disinfectant was measured, and the bromine-based disinfectant was added according to the measured effective halogen concentration in the treated water after the addition of the disinfectant. The method according to claim 23, wherein a reducing agent is added to the water to be treated later.

36. If the sewage system is a sewer system and does not exceed the treatment capacity of the sewage treatment plant, it will flow into the sewage treatment plant. If the sewage containing the amount of rainwater exceeding the treatment capacity of the sewage treatment plant flows into the sewage treatment plant or may flow into it, The amount of sewage mixed with the amount of rainwater exceeding the capacity of the sewage treatment plant is branched off at the sewer stormwater sewer stormwater drainage facility, disinfected with a bromine-based disinfectant, and then discharged into a public water area. As for sewage mixed with rainwater within the treatment capacity of sewage, sewage is characterized by being discharged into a public water area after being sterilized with a chlorinated disinfectant after the prescribed treatment at a sewage treatment plant. System.

37. A sewerage sewerage system, in which sewage flowing through sewer pipes in the sewer system is treated at the sewage treatment plant, sterilized with a chlorinated disinfectant, and then released into public water areas. Rainwater flowing through sewer storm sewers is discharged from rainwater drainage facilities, for example, pumping stations (drainage station) to public water areas, and if there is a large amount of rainfall, disinfection with bromine-based disinfectant at the rainwater drainage facility. A sewer system characterized by being discharged into public water after treatment.

38. The sewerage system should not exceed the treatment capacity of the aeration tank at the sewage treatment plant. When water flows into a sewage treatment plant, the sewage is first treated in the sewage treatment plant by the first settling basin, aeration tank, and final settling basin, and then sterilized by a chlorine-based disinfectant before entering the public water area. When sewage containing the amount of rainwater that does not exceed the treatment capacity of the first sedimentation 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 due to a large amount of rainfall For sewage mixed with rainwater that exceeds the treatment capacity of the aeration tank, it is branched after treatment in the first sedimentation basin at the sewage treatment plant, disinfected with a bromine-based disinfectant, and then discharged into public water bodies. For sewage mixed with rainwater in the treatment capacity of the aeration tank, treatment in the aeration tank and final sedimentation basin is followed by treatment in the first sedimentation basin at the sewage treatment plant, followed by disinfection treatment with a chlorine-based disinfectant. Sewer system, characterized in that the discharged into public waters after Tsu.

[0258] 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 with the systems shown in FIGS.

[0259] Example 1

A sterilization test was conducted using treated sewage water containing coliforms as treated water. As the disinfectant, 1-bromo-3-chloro mouth-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 treated water and Table 2 shows the test results.

[0260] [Table 1] Table 1

[0261] [Table 2] Table 2

[0262] BCDMH exhibited a bactericidal effect at a concentration of 1Z2 or less compared to sodium hypochlorite, and the addition of lm g / L as CI was able to reduce the number of coliforms to 3000 CFU / mL or less.

[0263] Trihalomethane was less than 0.1 mg / L under the condition that BCDMH was added with lmg / L as CI.

[0264] The disinfectant addition rate shall be indicated as active chlorine for both bromine and chlorine disinfectants, and expressed as "mg / L as Cl" in terms of active chlorine concentration. For example, when lg BCDMH is added to 1L of wastewater, it becomes 540mg / L as CI.

[0265] As for the reaction time, BCDMH showed a sufficient effect in 1 minute, while sodium hypochlorite required more than 5 minutes.

[0266] Example 2

After processing and floating and separating the aquatic processing wastewater, the wastewater obtained by the activated sludge treatment was used as the treated water. The disinfection additive concentration was changed for this treated water and sterilization test was conducted. Table 3 shows the quality of treated water and Table 4 shows the test results.

[0267] [Table 3] Table 3

[0268] Organic nitrogen refers to the value of organic nitrogen as a whole in addition to ammine. For example, in the case of protein, it means only the amount of 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 ammonia ions.

[0269] [Table 4] Table 4

[0270] BCDMH has a bactericidal effect at a concentration of 1/3 or less compared to sodium hypochlorite, 2.

The number of coliforms could be reduced to 3000 CFU / mL or less with the addition concentration of 5 mg / L as CI. Example 3

Wastewater was treated with the system shown in Figs. The results are summarized in Table 5.

[0271] [Table 5]

Table 5

Table 5 (continued)

* 1 A indicates B C D M H (effective halogen concentration of 54%). B is hypochlorous acid

Sodium (effective halogen concentration 10%).

* 2 chlorine (C 1 ₂₎ amount in terms of [mg / L].

* 3 N D means not detected.

[0272] In RUN1 (sewage volume 120m ³ / hour), the amount of coliforms can be reduced to 3 OOOCFU / mL or less with a BCDMH supplemented amount of 12mg / L. In RUN2 (sewage volume 250m ³ / hour), BCDM H addition amount 10mg / L is sufficient for disinfection Residual halogen concentration is 0.72mg / L, which is not appropriate. The amount of coliform bacteria can be reduced to 3000 CFU / mL or less with a BCDMH supplemented amount of 5 mg / L, and the residual halogen concentration is 0.03 mg / L, which is appropriate.

[0273] RUN3 (sewage volume 530m ³ / hour) is a case of heavy rainfall, and appropriate disinfection was possible with BCDMH addition of 3 to 4.5mg / L. The time when BCDMH was in contact with the sewage drainage sewage at this time was found to be about 50 seconds and could be disinfected in an extremely short time. [0274] RUN4 (sewer 250m ³ / hour) is a comparative example using sodium hypochlorite as a chlorinated disinfectant. In RUN4, even if the sodium hypochlorite supplementation dose is 60 mg / L, the number of colon bacteria cannot be reduced to 3000 CFU / mL or less, and the residual halogen concentration is 1.53 mg / L, LC value. (Specifically, it is more inappropriate than chlorine (C1) 0.4 mg / L).

50 2

[0275] In any of RUN1 to RUN4, when the amount of disinfectant-added water is 0 (zero), it indicates the quality of the influent water in rainy rain that has flowed into the rainwater drainage treatment plant.

[0276] Example 4

The disinfection device shown in Fig. 59 was used to disinfect sewer stormwater overflow. Table 6 shows the specifications of the equipment. 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 bactericidal effect of the amount of disinfectant added and the number of coliforms in the treated water after the addition.

[0277] From this experimental result, adding the disinfectant directly to the water to be treated in powder form quickly reduces the number of remaining coliforms to the release regulation value of 3. OX 10 ³ CFU / mL or less. It was divided that it was effective.

[0278] [Table 6] Table 6: Equipment specifications

[0279] [Table 7] Table 7: Water quality of water to be disinfected

[0280] [Table 8]

Table 8: Disinfectant addition and number of coliforms after disinfection

[0281] Example 5

Disinfection treatment by the method of the present invention was performed on rainwater overflowing water in the sewage treatment facility that created Figures 39 to 43. As the disinfection apparatus, an apparatus having the configuration shown in FIG. 44 was used. BCDMH was used as the disinfectant. Disinfectant introduction means Samples of the liquid to be treated were sampled from the sampling line 612 at a frequency of once every 10 minutes and introduced into the monitoring tank 613 at a frequency of once every 10 minutes while disinfecting the disinfectant from the disinfectant introduction means 604. Disinfectant 614 was added. The concentration of the disinfectant 614 added here was the disinfectant concentration that was introduced into the liquid to be treated from the disinfectant introduction means 604 at that time. The concentration of disinfectant at the start of disinfection treatment was 5 mg / L. Measure the residual halogen concentration in the sample to be treated 20 seconds after adding BCDMH to the sample to be treated in the monitoring tank using the measuring instrument 615, and the measured value is 0.2 mg / L as CI. If it is too high, the concentration of the disinfectant added from the disinfectant introduction means 604

2

If the measured value is lower than 0.2 mg / L as CI, disinfectant introduction means 604

2

The concentration of the added disinfectant was increased. Thus, the disinfection treatment was continued while adjusting the disinfectant input concentration every 10 minutes, and the number of coliforms in the effluent was measured every 15 minutes. The results are shown in Figure 60. From this result, it can be seen that the amount of disinfectant added changed with time, while the number of coliforms in the wastewater after treatment could be maintained below the disinfection target value (3000 CFU / mL)! /.

Claims

The scope of the claims

[1] a disinfection facility with a disinfection tank that disinfects sewage with chlorine or UV;

A bromine sewage device that disinfects sewage with bromine disinfectants;

A branching device that has an inlet, outlet 1 and outlet 2 and divides the sewage flowing into the inlet into outlet 1 and outlet 2.If the amount of sewage flowing into the inlet is below a predetermined value, the total amount of sewage flowing in When the inflow sewage amount is greater than or equal to the predetermined value, the sewage amount is discharged to the outlet 1, and the sewage amount obtained by removing the predetermined amount of sewage from the inflow sewage amount is discharged to the outlet 2. (de vice);

Consisting of

Outlet 1 of the branching device is connected to the sewage introduction part of the disinfection facility, and outlet 2 of the branching device is connected to the sewage introduction part of the bromine sewage treatment device (device)! A sewage treatment device (apparatus).

[2] Claims to reduce the number of coliforms in sewage to 3000 or less per sewage lcc by disinfection facilities

The sewage treatment apparatus according to 1.

[3] The sewage treatment apparatus according to claim 1, wherein the number of E. coli in the sewage is reduced to 200 or less per sewage lOOcc by a disinfection facility.

[4] The sewage treatment device according to claim 1, wherein the entrance 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 coliforms in the sewage to 3000 or less per lcc 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 sewage lOOcc.

[7] The sewage treatment apparatus according to claim 1, wherein the sewage disinfected by the disinfection facility and the Z or bromine sewage treatment apparatus is allowed to flow into a public water area.

[8] The disinfection facility further has 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. The sewage treatment apparatus according to claim 1.

[9] The disinfection facility further comprises a first settling basin, a batting tub and a final settling basin. The sewage introduction part of the first sedimentation basin is connected to the introduction part of the basin, the outlet of the first sedimentation basin is connected to the sewage introduction part of the basin tank, the outlet of the basin tank is connected to the sewage introduction part of the final basin, and the final The sewage treatment apparatus according to claim 1, wherein an outlet of the settling basin is connected to a sewage introduction section of the disinfection tank.

[10] The disinfection facility is

First settling basin,

[11] The disinfection facility

First settling basin,

A bath tank,

The final sedimentation basin,

Bromine sewage treatment device that disinfects sewage with bromine-based disinfectant. The sewage introduction part of the first sedimentation basin is connected to the introduction part of the disinfection facility, and the outlet of the first sedimentation basin is connected to the entrance of the branching device. The outlet 1 of the branching device is connected to the sewage introduction section The outlet of the batting 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 tank, and the outlet 2 of the branching device is the sewage introduction part of the bromine sewage treatment equipment. The sewage treatment apparatus according to claim 1, wherein the sewage treatment apparatus is connected to the sewage system.

[12] A sewage treatment plant (apparatus) in a sewage treatment plant,

First sedimentation basin;

A disinfection facility with a disinfection tank that disinfects sewage with chlorine or UV; and a bromine sewage treatment device that disinfects sewage with a bromine-based disinfectant;

A branching device that has an inlet, outlet 1 and outlet 2 and receives the effluent water from the first sedimentation basin at the inlet and divides it into outlet 1 and outlet 2, and the amount of water flowing into the branching device is below a predetermined value. The total amount of influent water flows to outlet 1, and when the amount of influent water is greater than or equal to a predetermined value, the predetermined amount of water flows to outlet 1, and the amount of inflow water volume excluding the predetermined amount of water flows to outlet 2. Device;

Sewage treatment device (app aratus) ₀ , characterized in that outlet 1 of the branching device is connected to the sewage introduction part of the disinfection facility and outlet 2 of the branching device is connected to the sewage introduction part of the sewage treatment device

[13] A sewage treatment plant (apparatus) in a sewage treatment plant,

First sedimentation basin;

Batsukiro;

The final sedimentation basin;

A branch device that has an inlet, outlet 1 and outlet 2 and receives the effluent from the first sedimentation basin at the inlet and divides it into outlet 1 and outlet 2. If the amount of inflow water is greater than or equal to the predetermined value, the diverter (devi) flows the predetermined amount of water to the outlet 1 and flows the amount of water excluding the predetermined amount of water to the outlet 2. ce) and;

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 entrance of the branching device, and the outlet 1 of the branching device is in contact with the sewage introduction part of the flapping tank. The outlet of the batting 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 the sewage of the bromine sewage treatment equipment. A sewage treatment apparatus characterized by being connected to an introduction section.

[14] Bromine sewage treatment equipment adds and mixes solid bromine-based disinfectant storage / supply device and solid bromine-based disinfectant storage / supply device into the treated water. The sewage treatment apparatus according to any one of claims 1 to 13, further comprising a disinfectant addition and mixing apparatus.

[15] Storage of solid bromine-based disinfectant 'Supply device comprises a storage tank for solid bromine-based disinfectant and a quantitative feeder for measuring and discharging a predetermined amount of solid bromine-based disinfectant in the storage tank. 15. The sewage treatment apparatus according to claim 14, wherein the storage tank and the constant volume feeder are provided with a stirrer for solid odor disinfectant composed of a plurality of injection ports for injecting compressed air therein.

16. The sewage treatment apparatus according to claim 15, wherein the fixed amount feeder comprises a rotary table having a weighing means.

[17] Disinfectant addition 'Disinfection water preparation device in which the mixing device receives a part of the treated water and mixes and dissolves the solid bromine-based disinfectant; and means for introducing the disinfecting water into the treated water The sewage treatment apparatus according to claim 14, further comprising:

[18] Disinfectant addition · mixing device force The disinfection device according to claim 17, which is installed in a flow path through which water to be treated flows.

[19] Solid bromine-based disinfectant storage, mixing device and addition · The mixing device is connected to a storage tank for storing the solid bromine-based disinfectant and the storage tank, and the disinfectant remains solid and is transferred to the injection point. The disinfectant transfer pipe is connected to the disinfectant transfer pipe and the disinfectant injecting device that adds the solid bromine-based disinfectant transferred through the pipe to the water to be disinfected. The disinfection device according to claim 14.

[20] The disinfection device according to claim 14, wherein the disinfectant completely dissolves from the addition position to the discharge point of the water to be treated.

[21] Further, a preparative line for collecting a sample of water to be treated, a disinfectant supply means for adding a disinfectant to the sampled sample of water to be treated, and a treatment to which a disinfectant has been added. An effective halogen concentration measuring device for measuring the effective halogen concentration of a water sample; Disinfectant added according to the degree of decrease in the effective halogen concentration in the sample of water to be treated after the addition of the disinfectant measured by an effective halogen concentration measuring device ・ Amount of disinfectant added to the water to be treated by the mixing device 15. A sewage treatment apparatus according to claim 14, further comprising a disinfectant addition amount control means for controlling the amount of the disinfectant.

[22] Furthermore, a reducing agent supply device for adding a reducing agent to the water to be treated after the addition of the disinfectant, and an effective halogen concentration measuring device for measuring the effective halogen concentration in the water to be treated after the addition of the disinfecting agent. 15. The sewage treatment apparatus according to claim 14, further comprising a reducing agent addition amount control device that controls the addition amount of the reducing agent according to the measured effective halogen concentration in the treated water after the addition of the disinfectant.

[23] A method of disinfecting sewage,

Inflow sewage, if the inflow sewage volume is less than the specified value,

If the amount of sewage is sterilized by UV and the amount of sewage is greater than the predetermined value, the amount of sewage is sterilized by chlorine or UV, and at the same time, the amount of sewage is removed from the amount of inflow sewage! A sewage treatment method comprising disinfecting with a disinfectant.

24. The method according to claim 23, wherein the number of coliforms in the sewage is reduced to 3000 or less per lcc 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 sewage lOOcc by disinfection with chlorine or UV.

27. The method according to claim 23, wherein the number of coliforms in sewage is reduced to 3000 or less per lcc of sewage by disinfection with a bromine-based disinfectant.

28. The method according to claim 23, wherein the number of Escherichia coli in the sewage is reduced to 200 or less per sewage lOOcc by disinfection with a bromine-based disinfectant.

[29] The method according to claim 23, wherein sewage sterilized by chlorine or UV and sewage sterilized by Z or bromine-based disinfectant are passed to public water bodies.

[30] The method according to claim 23, wherein the time for the disinfection treatment with the bromine-based disinfectant is 3 minutes or less.

[31] The method according to claim 23, wherein a solid bromine-based disinfectant is added to the water to be treated as a bromine-based disinfectant and mixed to disinfect.

[32] 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. 24. The method of claim 23, wherein sterilization is performed.

[33] The method according to claim 23, wherein the disinfectant completely dissolves from the addition position to the discharge point of the water to be treated.

[34] A bromine-based disinfectant was measured by sampling a part of the water to be treated, adding a bromine-based disinfectant, and measuring the effective halogen concentration of the sample-treated water to which the bromine-based disinfectant was added. 24. The method according to claim 23, further comprising controlling the amount of bromine-based disinfectant added to the treated water in accordance with the degree of reduction in the effective halogen concentration in the treated water sample after the addition.

[35] The effective halogen concentration in the treated water after adding the bromine-based disinfectant was measured, and the bromine-based disinfectant was added according to the measured effective halogen concentration in the treated water after adding the disinfectant. The method according to claim 23, wherein a reducing agent is added to the water to be treated later.