WO2006054351A1 - Système d’égout - Google Patents

Système d’égout Download PDF

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Publication number
WO2006054351A1
WO2006054351A1 PCT/JP2004/017232 JP2004017232W WO2006054351A1 WO 2006054351 A1 WO2006054351 A1 WO 2006054351A1 JP 2004017232 W JP2004017232 W JP 2004017232W WO 2006054351 A1 WO2006054351 A1 WO 2006054351A1
Authority
WO
WIPO (PCT)
Prior art keywords
disinfectant
water
sewage
amount
sewer
Prior art date
Application number
PCT/JP2004/017232
Other languages
English (en)
Japanese (ja)
Inventor
Sakae Kosanda
Yuichi Fuchu
Norio Makita
Yoshiharu Yasuhara
Hideyuki Yoshida
Shojiro Watanabe
Original Assignee
Ebara Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ebara Corporation filed Critical Ebara Corporation
Priority to PCT/JP2004/017232 priority Critical patent/WO2006054351A1/fr
Priority to JP2006544781A priority patent/JPWO2006054373A1/ja
Priority to PCT/JP2005/009959 priority patent/WO2006054373A1/fr
Publication of WO2006054351A1 publication Critical patent/WO2006054351A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/12—Emergency outlets
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • C02F1/766—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens by means of halogens other than chlorine or of halogenated compounds containing halogen other than chlorine
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/001—Runoff or storm water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection

Definitions

  • 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 flowing water or diversion sewer sewage overflow, and a sewer system equipped with a powerful disinfection apparatus.
  • 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.
  • chlorine-based disinfectants are added to keep the number of coliforms per lm (the number of E. coli) below 3000 (CFU / mL).
  • 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.
  • 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! Release Provide a sewer system with a means for quickly disinfecting simple discharged water mixed with flowing rainwater before it is discharged into public water bodies, and a method and apparatus for disinfecting rainwater mixed with rainwater or contaminated rainwater.
  • 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 schematic explanatory diagram for explaining a disinfection apparatus according to an embodiment of the present invention.
  • FIG. 5 is a schematic explanatory view illustrating one embodiment of the present invention in which a disinfectant is introduced into a sand basin.
  • FIG. 6 is a schematic explanatory view showing another embodiment of the present invention.
  • FIG. 7 is a schematic explanatory view showing one embodiment of an addition device for adding disinfecting water to sewer overflow water in rainy weather.
  • FIG. 8 is a schematic explanatory view showing another embodiment that can be adopted as a disinfectant storage and supply device.
  • FIG. 9 is a diagram showing a specific configuration example of a solid disinfectant storage unit.
  • FIG. 10 is a view showing an embodiment of a solid disinfectant storage tank.
  • FIG. 11 is a diagram showing an embodiment of a solid disinfectant storage tank.
  • FIG. 12 is a diagram showing an embodiment of a metering feeder.
  • FIG. 13 is a diagram showing an embodiment of a fixed amount feeder.
  • FIG. 14 is a view showing a form in which a container is connected to a solid disinfectant storage tank.
  • FIG. 15 is a diagram for explaining a configuration example of a solid disinfectant container.
  • FIG. 16 is a diagram illustrating an example of an installation form of a solid disinfectant supply facility.
  • FIG. 17 is a diagram for explaining another form of a container containing a solid disinfectant.
  • FIG. 18 is a diagram showing another configuration example of a dissolving unit that dissolves a solid disinfectant in water to form disinfecting water.
  • FIG. 19 is a diagram showing another form of solid bromine-based disinfectant storage / supply device that can be used in the present invention.
  • FIG. 20 Storage of other forms of solid bromine-based disinfectant that can be used in the present invention. It is a figure which shows a feeder.
  • FIG. 21 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.
  • a solid bromine-based disinfectant is put into solid sewer overflow water to be treated as a solid, and is a diagram showing a specific example of a disinfecting apparatus according to one aspect of the present invention.
  • ⁇ 23 It is a figure which shows one form of disinfectant injection apparatus.
  • ⁇ 25 It is a diagram showing another form of the disinfectant injection device.
  • This graph shows the time course of the undissolved disinfectant residual rate, residual halogen concentration, and number of coliforms after a solid disinfectant was added to sewer overflow water during rainy weather.
  • FIG. 27 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.
  • ⁇ 28 It 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. 29 is a diagram showing another embodiment in which the shape of the channel 507 of sewer stormwater overflow after addition of the disinfectant is changed.
  • FIG. 30 is a diagram showing another embodiment in which the shape of the channel 507 of sewer stormwater overflow after the addition of the disinfectant is changed.
  • FIG. 31 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.
  • FIG. 32 is a diagram showing another configuration example of a disinfecting apparatus in which a solid bromine-based disinfectant is put into a sewer stormwater overflow to be treated in a solid state to disinfect.
  • FIG. 33 is a diagram showing another configuration example of a disinfecting apparatus that disinfects a solid bromine-based disinfectant as it is by putting it in the sewer stormwater overflow to be treated.
  • FIG. 34 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 is added to rainwater overflow in a sewage treatment facility.
  • FIG. 35 Graph showing the number of coliform bacteria after disinfection when various concentrations of halogen disinfectant are added to sewage in the rain after 0.5 hours (point A in Figure 34) It is.
  • FIG. 36 A graph showing the number of coliform bacteria after disinfection when various concentrations of halogen-based disinfectants are added to sewage during rainy weather after 45 minutes (point B in Fig. 34). is there.
  • FIG. 38 is a graph showing the relationship between the elapsed time after addition of a disinfectant and the residual halogen concentration in the liquid to be treated when a halogen-based disinfectant is added to rainwater overflowing water at various elapsed times after rainfall. It is.
  • FIG. 39 is a diagram showing a configuration example of a disinfection device for sewer stormwater overflow according to one embodiment of the present invention.
  • FIG. 40 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.
  • ⁇ 41 It is a diagram showing a sewer network that collects waste water to be disinfected by a disinfection device and a treatment area.
  • FIG. 42 is a diagram showing a sewer network for collecting waste water to be disinfected by a disinfection device, a treatment area, and an adjacent treatment area.
  • FIG. 43 is a diagram showing a configuration example of a control device of a sewer stormwater overflow disinfecting device according to the present invention.
  • FIG. 44 This figure shows the mapping process used in the control method of the sewer overflow water disinfection device according to the present invention, and (a) shows the measurement 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. 45 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.
  • FIG. 46 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.
  • FIG. 47 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. 48 is a diagram showing a processing procedure for detecting an excess or an excess of the amount of drug added.
  • FIG. 49 is a diagram showing a processing procedure for detecting an excess or an excess of a drug addition amount.
  • FIG. 50 is a diagram showing a processing procedure for detecting an excessive amount of drug addition.
  • FIG. 51 is a diagram showing a concept of a control device that detects an abnormal supply of a solid disinfectant and stops the supply.
  • FIG. 52 is a diagram illustrating 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. 53 is a conceptual diagram showing an example of a control system of a sewage overflow water disinfection system in the rain according to the present invention.
  • FIG. 54 is a diagram showing a configuration of a sewage overflow water disinfection device used in Example 4.
  • FIG. 55 is a graph showing the results of Example 5.
  • 710 is a treatment plant
  • 711 is a sewer pipe
  • PI, P2, and P3 are relay pumps.
  • 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
  • 731 is rainfall information mapping 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.
  • 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
  • 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
  • 741 is the amount of chemical added
  • 742 is the amount of chemical consumption
  • 743 is the drainage disinfection start time
  • 750 is the turbidity measuring means
  • 751 is the influent water turbidity
  • 752 is the actual value measuring means
  • 753 is rainfall
  • 754 is rainfall intensity
  • 755 is inflow
  • 756 is chemical supply
  • 757 is residual chemical concentration
  • 760 is regional characteristics simulation means
  • 761 is expected inflow
  • 762 is expected inflow pollution load is there.
  • 710 is a treatment plant
  • 720 is a rainfall information measuring means
  • 721x is a treatment area X.
  • Rainfall information 722x is rainfall information of processing area X
  • 730 is a control device
  • 737 is predicted value Z actual value correction processing means
  • 737a and 737b are correction value addition processing means
  • 738 is drug addition amount calculation processing means
  • 739 is Drug addition rate setting means
  • 741 is drug addition amount
  • 742 is drug consumption
  • 752 is measured value measurement means
  • 753 is rainfall
  • 754 is rainfall intensity
  • 755 is inflow water
  • 756 is drug supply
  • 757 is The chemical concentration in the discharged water
  • 760 is the regional characteristic simulation means
  • 761 is the expected inflow
  • 762 is the expected inflow pollution load.
  • 813 is the residual halogen concentration meter for the discharged water
  • 843 is the residual halogen concentration meter for the dissolution tank
  • 870 is the output for determining the high level of residual halogen
  • 871 is the output for determining the low level of residual halogen
  • 901 is the residual halogen for discharged water.
  • 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! Is the value.
  • 835 is a hopper weigh scale
  • 836 is the number of revolutions of the supply machine
  • 881 is an output of determining whether the amount of added medicine is too low
  • 883 is an output of determining excess amount of the added drug
  • 910 is the number of revolutions of the supplying 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
  • 913 is a medicine discharge amount determination processing sampling period.
  • 814 is an outlet 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 determination time
  • 925 is the drifting fish population high level threshold.
  • 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
  • 55 7 Is water to be disinfected
  • 559 is a solid bromine-based disinfectant
  • 560 is a pressure adjusting means.
  • 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 the sewage treatment plant, and are subjected to advanced treatment through precipitation treatment, aeration (biological reaction) treatment, final precipitation treatment, disinfection treatment, etc. Discharged as water into public waters. Public waters include rivers, lakes, harbors and coastal waters. However, when 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 provided in the middle of the sewer pipe.
  • a rainwater discharge chamber and a pumping station drainage station
  • CSO combined sewer overflow
  • “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 rainwater pipes of the sewerage sewers via the rainwater ditches, etc., and discharged into the public water areas of the pump stations (drainage station) installed at multiple locations of the rainwater pipes.
  • the sewer stormwater overflow that is discharged from the pumping station of the storm water pipeline should originally contain only rainwater.
  • a large amount of rainwater flows through the sewer, and at this time, it exists on the ground surface such as a road.
  • the existing pollutants and sludge accumulated in the sewer will also be washed away. Therefore, stormwater overflows in diverted sewers may contain E. coli caused by contaminants and sludge on the ground surface.
  • CFU colony forming unit
  • 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.
  • 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).
  • chlorine mixing tank disinfection tank
  • 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.
  • a considerable amount of unknown water has entered the sewer pipe of the sewer sewer.
  • SSO sanitary sewer overflow
  • One aspect of the present invention is a means for promptly disinfecting these combined sewer overflow, split sewer stormwater overflow, and split sewer sewage overflow (disinfection according to the present invention shown in FIG. 1 and FIG. 3).
  • a sewer system provided with a device).
  • the sewage treatment plant 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.
  • the capacity of the sewage treatment plant is increased by a large amount of rainfall after the prescribed treatment of the first sedimentation basin, aeration tank, final sedimentation basin, etc. and then disinfection treatment with chlorinated disinfectant.
  • sewer overflow facilities such as rainwater discharge rooms, pump stations (drainage stations), or pumping pump stations at sewage treatment plants, disinfect with odor-based disinfectants, and then discharge into public water areas for sewage treatment.
  • sewage mixed with rainwater it is treated in a sewage treatment plant at the first settling basin, aeration tank, final settling basin, etc., then sterilized with a chlorinated disinfectant and then discharged into a public water area.
  • a sewer system is provided.
  • the sewage that flows through the sewer pipe of the sewer system is treated in the sewerage treatment plant.
  • the sewerage treatment plant After performing the prescribed treatment, disinfecting with a chlorine-based disinfectant and then releasing it into public water areas.
  • the rainwater drainage facility for example, from a pumping station (drainage station) to the public water area
  • the rainwater flowing through the sewer storm drain is treated with a bromine-based disinfectant at the rainwater drainage facility.
  • a sewer system is provided which is characterized by being discharged into public waters.
  • 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 In the sewage treatment plant after the prescribed treatment of the first sedimentation tank, aeration tank, final sedimentation tank, etc., the sterilization process is carried out by the chlorinated disinfectant and then discharged into public water.
  • the treatment capacity of the first settling basin of the treatment plant does not exceed the treatment capacity of the aeration tank, but the sewage containing the amount of rainwater exceeding the treatment capacity of the aeration tank flows or may flow into the sewage treatment plant, the treatment capacity of the aeration tank will be exceeded.
  • the amount of sewage mixed with rainwater is branched after treatment in the first sedimentation basin at the sewage treatment plant, disinfected with a bromine-based disinfectant, discharged into public water areas, and sewage mixed with rainwater within the treatment capacity of the aeration tank.
  • the prescribed treatment in the aeration tank and final sedimentation basin, etc. is performed, followed by disinfection treatment with a chlorinated disinfectant and then release into public waters.
  • a sewer system is provided.
  • an apparatus for disinfecting the above-mentioned combined sewer overflow, split sewer stormwater overflow or split sewer sewage overflow water 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.
  • 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.
  • sewage mixed with rainwater that is, combined sewer overflow (CSO)
  • diversion sewer rainwater containing pollutants released from rainwater pipes to public water areas during rainfall
  • sewer sewer stormwater overflow In sewerage sewerage, sewage containing unknown water discharged from sewage pipes to public water areas, that is, sewer sewer sewage overflow (SSO) can be mentioned.
  • sewer sewer sewage overflow diversion sewer stormwater overflow or diversion sewer sewage overflow will be collectively referred to as sewer stormwater overflow.
  • a solid bromine-based disinfectant is used for disinfecting sewer stormwater overflow.
  • 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 dibromo-5,5-dimethylhydantoin (DBDMH), and the like. Can be mentioned.
  • 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
  • a disinfection device for sewer stormwater overflow which includes a disinfecting water addition device for disinfection by adding to rainwater sewer stormwater overflow containing ammonia ions.
  • the total organic carbon force in the sewer stormwater overflow is preferably 5 mg / L or more.
  • the ammonium ion concentration in the sewer stormwater overflow is preferably lmg / L or more.
  • the concentration of the disinfectant in the disinfecting water is preferably 100 mg / L as CI and 1 Og / L as CI in terms of active chlorine concentration.
  • the addition concentration of the disinfectant in the sewer stormwater overflow is converted into the active chlorine concentration, 0.5 mg / L as CI is preferably 25 mg / L as CI.
  • the adding step includes a step of introducing the disinfecting water under the surface of the sewer stormwater overflow. Furthermore, it is preferable that the method further includes a step of discharging the sterilized sewer stormwater overflow into the public water area.
  • an apparatus for producing disinfecting water from a disinfectant and a part of sewer stormwater overflow comprising
  • sewer stormwater overflow There is provided an apparatus for disinfecting sewer stormwater overflow, wherein the sewer stormwater overflow is disinfected while staying in the sand basin.
  • the disinfecting water production apparatus comprises a disinfectant storage device, a device for adding the disinfectant to the sewer stormwater overflow, and the disinfectant and the sewer stormwater overflow. It is preferable to have a device to perform. 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
  • the first flow path is connected to an addition device for introducing the disinfecting water below the surface of the sewer stormwater overflow!
  • the storage pond or the discharge channel is provided with a measuring instrument for inspecting the quality of sterilized sewer stormwater overflow.
  • sewer stormwater overflow containing organic matter and ammonia or ammonia ions is disinfected.
  • sewage such as sewage or drainage and rainwater mix and flow through a sewer pipe.
  • 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.
  • the sewerage system sewage pipe basin
  • the sewerage system sewage pipe basin
  • the sewer system sewage pipe stormwater
  • the content of organic matter in the sewer stormwater overflow is, for example, that the total organic carbon in the sewer stormwater overflow may be 5 mg / L or more. It may be 30 mg / L or more, or 50 mg / L or more. For combined and separated sewage, the total organic carbon is generally 5 mg / L or more.
  • the concentration of ammonium ions in the sewer stormwater overflow to be treated may be 1 mg / L or more, or 10 mg / L or more.
  • the active bromine changes to NHBr, NHBr, etc. But Bromo
  • the ammonia ion concentration is generally 1 mg / L or more.
  • the ammonia ion concentration is often 1 mg / L or more in overflow water called first flush immediately after rainfall.
  • 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.
  • 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.
  • diversion rainwater often contains E. coli.
  • a solid bromine-based disinfectant is used. Compared to chlorine-based disinfectants, bromine-based disinfectants are characterized by a shorter disinfection time. Bromine disinfectants can be disinfected in tens of seconds to minutes. Moreover, since hypobromite (HOBr) is easily decomposed in nature, it is not necessary to provide a device for decomposing the hypobromite remaining in the waste water. On the other hand, with chlorine-based disinfectants, active chlorine reacts with ammonia in sewage to form chloramine and reduces sterilizing power, so it is disinfected within the residence time of the sewer stormwater overflow facility. It is difficult to do. In addition, since chloramine is highly persistent, it is necessary to provide a device for decomposing it.
  • Examples of the solid bromine-based disinfectant preferably used in the present invention include 1 bromo 3-black mouth 5,5-dimethylhydantoin (BCDMH), 1, 3 dibromo-5, 5-dimethylhydantoin (DB DMH) And so on.
  • One aspect of the present invention includes a step of mixing a predetermined disinfectant with water.
  • a disinfectant may be added to sewer stormwater overflow at a facility for removing sewer stormwater overflow.
  • 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.
  • these sewer overflow facilities for drainage often have sand basins.
  • 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.
  • a main channel through which sewer stormwater overflow flows and a bypass channel that also branches the main channel are provided, and a disinfection tank is installed in the bypass channel May be.
  • a disinfection tank disinfectant can be added to sewer stormwater overflow, and disinfectant can be dissolved in sewer stormwater overflow.
  • the place where the disinfectant is added is on the inflow side of the rainwater drainage pump, it is preferable because the disinfectant and the sewer stormwater overflow are sufficiently mixed by the stirring force in the pump.
  • the residence time in the sand basin can be used for the reaction time.
  • the disinfectant used in the present invention is solid at room temperature, the disinfectant can be dissolved in water to make disinfectant water, and can be added to sewer stormwater overflow.
  • the dissolution method is not particularly limited, and any of a water flow stirring by an ejector, a flow path stirring, and a dissolution tank provided with a mixing device may be used.
  • disinfectant water may be used in which disinfectant is dissolved in an amount of 1% by weight or more, preferably 10% by weight or more, more preferably 20% by weight or more with respect to the saturated dissolution concentration of the disinfectant. Good! However, it is not necessary to dissolve all of the added disinfectant in water, and solid disinfectant may remain in the disinfecting water.
  • the concentration of disinfecting water is preferably 100 mg / L as CI and 10 g / L as CI in terms of active chlorine concentration, and 200 mg / L as CI and 2 g / L as CI. Further preferred. 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.
  • 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.
  • the amount of rainfall that is, the amount of sewer stormwater overflow and water quality
  • the amount of disinfecting water added will increase.
  • 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.
  • inflow water quality it is possible to determine the state of rainwater contamination by measuring turbidity or electrical conductivity. With this index, on-time detection is possible.
  • 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.
  • various flowmeters may be used as for the inflow water volume.
  • the disinfecting water is added to a predetermined sewer stormwater overflow to disinfect.
  • the disinfecting water in the disinfecting water tank is introduced into the main channel through the bypass channel.
  • the concentration of disinfectant in sewer stormwater overflow is 0.5-25 mg / L as CI in terms of active chlorine concentration. It is even 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.
  • the treated water When the treated water is sewage mixed with rainwater, urine, industrial wastewater, etc., these treated waters generally have the ability to contain coliforms in the range of 10 4 to 10 7 CFU / mL. With the added amount of the disinfectant, the water to be treated can be sterilized quickly and normally in about 1 minute.
  • FIG. 4 is a schematic explanatory diagram illustrating one embodiment of the present invention.
  • 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.
  • the residual / logen detector is disposed between the discharge gate and the front of the discharge port.
  • the active halogen concentration force LC value detected by the residual halogen detector for example, BCDMH
  • Public water includes rivers, lakes, harbors, coastal waters, public ditches, irrigation canals, and other public waters or canals.
  • 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 this Bromine disinfectant is added to sewer stormwater overflow and converted to disinfecting water, and returned to channel 12 again.
  • 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.
  • an automatic screen 22 In the bypass flow path 20, an automatic screen 22, a flow meter 23, a disinfectant addition device 30, a dissolution device 40, and a pump 46 are arranged in this order.
  • the disinfectant addition device 30 includes a hopper 32 for storing the solid bromine-based disinfectant 39, a feeder 34 for supplying the solid bromine-based disinfectant 39, and 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.
  • 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.
  • the disinfecting water obtained by the apparatus 40 is preferably guided by the pump 46 to the flow path 12 of the sewer stormwater overflow through the flow path 47.
  • a reservoir portion may be formed in the flow path 12 or the discharge flow path 17 of sewer stormwater overflow.
  • stirrer or baffle can be placed to promote mixing of disinfecting water with sewer stormwater overflow.
  • a pump 13 is arranged 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.
  • the other part of the sewer stormwater overflow in the inflow part 11 flows into the sand settling parts 14a, 14b, 14c.
  • a part of the sewer stormwater overflow introduced into the bypass channel 20 is dissolved by the disinfectant supply device and dissolution device shown in Fig. 4 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 the distribution tank 48 as shown in FIG.
  • the distribution tank 48 is provided in the flow path 47.
  • the sand settling portions 14a, 14b, and 14c of the sand settling basin 10 are illustrated, and the inflow portion 11 is omitted.
  • the disinfecting water may be guided to the inflow portion 11 of the sand basin 10, or may be introduced upstream of each of the sand sediment portions 14a, 14b, 14c of the sand basin 10 as shown in FIG. Good.
  • the sand contained in the sewer stormwater overflow settles and is removed.
  • 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.
  • the sewage overflow water and disinfecting water during rain preferably stay for 1 to 30 minutes, more preferably for 1 to 15 minutes, and still more preferably for 1 second. 1 Stay for 10 minutes.
  • FIG. 7 shows an embodiment of an addition apparatus 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 distribution tank 48 is disinfected. It flows through the water supply channel, pipe 52, and hose 54 in this order, and is added to sewer stormwater overflow 15.
  • the open end 56 of the hose 54 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.
  • the tube 52 is preferably made of a material that is not corroded by disinfecting water.
  • 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.
  • 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.
  • FIG. 8 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 stirrer for stirring the solid disinfectant in the tank is provided at the bottom of the storage unit 101, and is connected to the motor 104 to rotate.
  • 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.
  • the shape of the storage part is cylindrical, for example, cylindrical, and powder compaction and bridge formation are achieved by mechanical stirring by a stirring blade and stirring by air. Is preventing. If the reservoir is an inverted cone type, like a conventional hopper, A bridge is formed by the disinfectant and is liable to cause a supply failure.
  • the present invention is intended to disinfect sewer stormwater overflow during heavy rain, so a solid bromine-based disinfectant is stored for a long period of time, and more than 10 to 10 times a year. It must be disinfected by adding to the sewer stormwater overflow immediately in case of heavy rainfall.
  • 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.
  • solid bromine-based disinfectants are more susceptible to compaction and bridging than other solid powders! / And! / ⁇ ⁇ characteristics, and preventing solidification and bridging It is essential for the smooth supply of disinfectants.
  • the solid disinfectant is mechanically agitated by the agitating blade 103, and air from the air source 105 is air holes provided at a plurality of locations at the bottom of the tank 100. Stir by blowing more.
  • a dehumidifier in the air introduction line from the air source 105 so that dry air is supplied to the storage unit 101.
  • the humidity of the stirring air is preferably such that the dew point is 5 ° C or less at a pressure of 0.5 MPa, for example.
  • the supply of the stirring air can be performed intermittently.
  • the supply amount of the stirring air is preferably about 80 NL / min with respect to the reservoir lm 3 .
  • the air source 105 it is preferable to use a device that can always maintain a pressure of 0.5 MPa or more.
  • the solid disinfectant can be smoothly discharged from the supply unit 102 without being obscure.
  • the air in the reservoir 101 is exhausted through the dust collector 106.
  • the dust collector 106 a bag filter, a water washing tower, a cyclone, or the like can be used.
  • the shape of the solid disinfectant storage unit 101 is preferably a cylindrical shape, but if a powder flow mechanism using a stirrer or an air purge is provided, a conical shape or a rectangular shape can also be used.
  • 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.
  • the solid disinfectant storage unit includes a solid disinfectant storage tank 100, and a fixed-quantity feeder that measures a predetermined amount of powder in the storage tank 100 and discharges it to a supply destination. 102.
  • the storage tank 100 is attached to the support frame 112, and the metering feeder 102 is attached to the lower surface of the storage tank 100.
  • the storage tank 100 will be described with reference to FIGS. 10 and 11.
  • 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.
  • the container body 100c includes 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.
  • 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.
  • 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.
  • 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 placing the storage tank 100 on the support frame 12 (FIG. 9) are provided on the outer periphery of the container body 100c.
  • the stirring blade 130 includes a pair of radiating blades 131, 131 extending radially in the opposite direction from the axis 115 to the inner peripheral portion of the container body 100c.
  • Each of the radiating blades 131 has an upwardly projecting hollow triangular cross section that communicates, and the radial tip is bent toward the direction of rotation R. And protrudes upward.
  • the radiating blade 131 is supplied with compressed air from the compressed air source 162 through the check shaft 164 through the drive shaft 128 to the hollow portion thereof, on the ridgeline at the upper end of the triangular section and in the rotational direction R.
  • a plurality of injection ports 133 are formed on the side surface.
  • 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.
  • a stirring blade 142 which is a stirring means integrally provided on the rotary table 140.
  • the quantitative feeder 102 includes a drive source 144 that rotates the drive shaft 138.
  • the container body 134 has a cylindrical shape having an inner diameter substantially the same size as the discharge port 124 of the storage tank 100, the supply port 146 is formed in 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.
  • the turntable 140 is provided with a plurality of measuring chambers 140a in the circumferential direction of the outer periphery, which are opened at the top and bottom and radially outward as measuring means.
  • 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.
  • 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.
  • 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.
  • 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 near 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. .
  • the stirring blade 142 is radially opposite from the axis 115 to the inner periphery of the container body 134.
  • a pair of radiating blades 143 and 143 extending in the direction is provided.
  • Each of the radiating blades 143 has a hollow triangular cross section that communicates upward and has a radially leading end protruding 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.
  • 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.
  • the melting cone 108 a plurality of nozzle forces at the periphery of the upper end of the funnel-shaped main body that has spread upward are discharged, and the discharged water is spirally lowered along the inner surface of the funnel-shaped main body. Washed away. The powder is melted by introducing the powder from the tube member 107 into this flow.
  • a dissolution cone is provided between the drug supply unit and the chemical dissolution unit, and the chemical cut out in 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.
  • 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.
  • a solid disinfectant container can be connected to the disinfectant inlet 126 of the storage unit 101.
  • 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.
  • the discharge port 184 (state shown in FIG. 14).
  • 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.
  • 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.
  • 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 abuts 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.
  • 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.
  • the cone rod 118 is guided in a vertically slidable manner 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).
  • FIG. 16 an example of an installation form of the solid disinfectant supply facility configured as described above will be described.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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
  • 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.
  • 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.
  • the fixed amount feeder 102 is attached to the outside of the storage tank 101.
  • 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.
  • 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.
  • Fig. 18 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. 8 and the like is installed on a pit 210 provided in the channel 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.
  • FIG. 18b is a view of the line AA in FIG. 18a as viewed from above. In this manner, the discharge port 204 is branched and arranged.
  • the height of the apparatus can be reduced.
  • the mixer is disposed below the feeding device, so the height force S of the device is inevitably high.
  • the mixer is disposed in the sewage flow path, so that the height of the apparatus is reduced.
  • the conventional solid disinfectant storage and supply device was about 5.5m high, but with the configuration shown in Fig. 18, the device height can be about 2-3m.
  • the feed water head to the mixer becomes small, the power for water supply can be reduced.
  • 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. 18, 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.
  • FIG. 19 shows another form of the solid bromine-based disinfectant storage / supply device that can be used in the present invention.
  • the storage and supply device for solid bromine-based disinfectant shown in Fig. 19 includes 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.
  • 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 the dissolving cone 108 shown in FIG. 8 or the underwater mixer 202 shown in FIG. 18 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, the height of the storage tank can be lowered, and there is also an IJ point that air for stirring the solid disinfectant is unnecessary.
  • FIG. 20 is a diagram showing another form of a solid bromine-based disinfectant storage and supply device that can be used in the present invention.
  • 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.
  • 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 a dissolving cone 108 shown in FIG. 8 or an underwater mixer 202 shown in FIG.
  • Such a device can also be used as a transport means for replenishing a solid bromine-based disinfectant storage tank for use as a solid bromine-based disinfectant storage / supply device.
  • the solid bromine-based disinfectant storage tank 310 shown in FIG. 20 is a so-called hopper type, but a mechanical stirrer or an air purging or other consolidation prevention mechanism 311 such as an air purge is installed on the bottom surface. The formation of dice is prevented.
  • the storage tank shown in FIGS. 8, 10, and 19 can be used.
  • Figure 21 shows another example of a solid bromine-based disinfectant storage and supply device that uses a single screw pump for fluid and 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.
  • another single screw pump 320 is further arranged, and water for dissolution 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.
  • 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.
  • the emulsification disperser 326 for example, an emulsification pump having a grinder-like shape can be used.
  • 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.
  • the ability of single screw pump 312 for transferring solid bromine-based disinfectant is made larger than that of single screw pump 320 for water supply.
  • 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.
  • the solid bromine-based disinfectant is first mixed and dissolved in water, for example, a fraction of sewer stormwater overflow to be treated. Disinfecting water is formed and this is thrown into sewer stormwater overflow for disinfection.
  • the solid bromine-based disinfectant can be infused and dissolved in the sewer stormwater overflow to be treated in the solid state for disinfection.
  • FIG. 22 shows a specific example of the disinfecting apparatus according to one aspect of the present invention in which the solid bromine-based disinfectant is put into the sewer stormwater overflow to be treated in the solid state.
  • a powdery or granular solid bromine-based disinfectant 408 is accommodated in the disinfectant storage tank 401.
  • 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.
  • a disinfectant injection apparatus 409 is provided with a stirring blade 407 connected to a motor 406. By the action of the stirring blade 407, a powder or granular solid bromine-based disinfectant 408 is dissolved in the water to be treated.
  • the disinfectant injection device 409 preferably has 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.
  • the disinfectant injection device is in a reduced pressure state by the action of the generated jet.
  • the disinfectant injection device 409 shown in FIG. 23 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.
  • a water flow is generated in the cover, and a jet 422 is generated in the vicinity of the end of the narrow tube.
  • 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.
  • 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.
  • the pump 441 is arranged in the water flow 412 of the 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.
  • a suction machine can be installed in the vicinity of the disinfectant injecting apparatus 409 in addition to the above configuration.
  • solid bromine-based disinfectant is put into solid sewer overflows to be treated as solids. * Mixing to disinfect sewer overflows during rainy weather. 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.
  • 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.
  • the second purpose of the mixing operation is to uniformly disperse the disinfectant in the water to be treated.
  • the disinfectant 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.
  • 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.
  • the time required for the halogen-based disinfectant to disinfect by its disinfecting ability (oxidation power) and the disappearance of the acid power upon completion of the acid-acid 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 effective halogen concentration is about 2 mg / L as CI, the oxidizing power of the disinfectant is lost. Can be used as an indicator that the effective halogen concentration has decreased to 0.5 mg / L as CI or less.
  • BCDMH 1-bromo-3-chloro-5,5-dimethylhydantoin
  • the time required for the disinfectant to dissolve in the treated water is about 1 minute, whereas the effective halogen concentration is 2 mg / L as CI.
  • the time required to decrease to 0.5 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, sewer stormwater overflow. Therefore, dissolve the disinfectant little by little. In other words, it is possible to achieve both a sufficient disinfecting effect and a reduction in the residual halogen concentration of the discharged water by completely dissolving it and securing a force of about 30 seconds.
  • FIG. 26 shows the residual rate of the 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.
  • the amount of undissolved disinfectant decreases and the residual halogen concentration increases.
  • 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.
  • the undissolved disinfectant disappears, the residual halogen concentration decreases rapidly.
  • the coliform group is constantly exposed to the oxidative power supplied, so it continues to decrease until the residual halogens are depleted.
  • 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.
  • Fig. 27 shows a 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. 27.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • FIG. 28 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.
  • 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. 29 shows another 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.
  • 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. 30 shows still another embodiment.
  • 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.
  • Fig. 31 shows still another embodiment.
  • the sewer stormwater overflow facility 511 such as a rainwater spout chamber or a pumping station of the combined sewer
  • the outlet 508 Time may not be secured.
  • 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.
  • a part of the sewage to which the disinfectant is added flows into 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.
  • Fig. 32 shows another configuration example of a disinfecting apparatus in which a solid bromine-based disinfectant is put into a sewer stormwater overflow to be treated as it is to be disinfected.
  • 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. 33 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • an appropriate amount of a disinfectant that exhibits an appropriate disinfecting effect and does not generate residual halogen is obtained in accordance with fluctuations in the water quality of the wastewater, and this minimum amount of disinfectant is applied. It can be added to the treatment liquid.
  • the number of coliforms after disinfection is 9000 CFU / mL at 30 minutes after rain (time A), and the number of coliforms after disinfection is 4700 CFU at 45 minutes after rain (time B).
  • / mL both of which are disinfection target values (discharge standard value stipulated in Water Pollution Control Law: 3000 CFU / mL or less) is not satisfied.
  • One hour and 30 minutes after the rain (C time point) the number of coliform bacteria after disinfection was less than lOCFU / mL, which is below the disinfection target value.
  • the number of coliforms after disinfection in the treated water is slightly over 3000 CFU / mL when the BCDMH addition rate is 4 ppm, and is less than 10 OCFU / mL when the BCDMH addition rate is ⁇ 10 ppm, which is well below the target disinfection value. It was. From the above, it can be seen that it is necessary to cover BCDMH at an addition rate of about 4.2 to 4 ppm in order to disinfect sewer overflow water at this point.
  • the disinfection effect of the liquid to be treated is not sufficient when the BCDMH addition rate is 3 ppm.
  • 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.
  • the amount of 3 ppm disinfectant added at time B is still slightly less than the required amount.
  • the residual halogen concentration was about 0.3 mg / L as CI, about 15 seconds, about 20 seconds after the addition of the disinfectant.
  • the residual halogen concentration after disinfectant treatment is considered to be somewhat marginal to reliably achieve the disinfection target value. Therefore, it should be set at approximately the midpoint between line B and line C in Figure 38. That is, from FIG. 38, if the residual halogen concentration is set to 0.2 mg / L as CI 20 seconds after adding BCDMH,
  • the amount of disinfectant input to the wastewater is adjusted to a value lower than the concentration input to the wastewater sample.
  • 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.
  • 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.
  • how much the concentration actually put into the wastewater should be increased or decreased. This can be determined empirically by the vendor.
  • a target value for reducing the residual halogen concentration is set by creating graphs as shown in Fig. 34 and Fig. 38, the amount of disinfectant added to the sewage during rainy weather will be controlled based on this setting value during subsequent rainfall. It can be performed.
  • Fig. 39 shows a configuration example of a sewage overflow water disinfecting apparatus according to an embodiment of the present invention configured based on this technical idea.
  • the disinfecting apparatus shown in Fig. 39 includes an introduction line 602 for a liquid to be treated (water 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.
  • 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.
  • 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.
  • Disinfection of sewer stormwater overflow is performed by adding an appropriate amount of disinfectant from the disinfectant introduction means 604 and treating it in the disinfection tank 603.
  • 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.
  • the preset target value and the value measured in the monitoring tank 613 are compared. For example, when the graphs in Fig. 34 and Fig. 38 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.
  • 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.
  • 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.
  • the liquid to be treated with the disinfectant 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.
  • the sample to be treated upstream from the disinfectant input position 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. 38, 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.
  • the above monitoring operation is performed regularly, for example, every 60 minutes, preferably every 20 minutes, and every 5 minutes and 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.
  • the amount of disinfectant added varies depending on the type of disinfectant and the nature of the overflow water. Generally, 1-10 mg / L (ppm), preferably In the present invention, it is preferable to control the addition amount of the disinfectant within this range.
  • the disinfection tank 603 can have a contact time required for disinfection with a solid bromine-based disinfectant that is not a special reaction tank or a sewer stormwater overflow channel. It ’s good.
  • 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.
  • 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.
  • the residual halogen concentration of the treated water to which the disinfectant was added was measured by the sewer overflow water disinfection device shown in Fig. 39, and if the residual halogen concentration was high, the reducing agent was added and neutralized. It is preferable to discharge after performing.
  • the system shown in Fig. 40 shows the treatment method for sewer stormwater overflow with the addition of the disinfectant downstream of the disinfection tank 603 in Fig. 39.
  • the sewer stormwater overflow with the disinfectant added is guided from the disinfection tank 603 to the drainage channel.
  • the residual halogen concentration of the treated water is measured by the residual halogen concentration detector 623.
  • 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.
  • the reducing agent 621 may be input directly into the drainage channel 620 as shown in FIG. 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.
  • the halogen detector 623 is linked with the disinfectant introduction means shown in FIG.
  • 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.
  • 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.
  • 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.
  • FIG. 41 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.
  • sewage within the treatment area sewage containing rainwater, drainage containing rainwater flowing down the surface, etc., particularly sewer stormwater overflow
  • 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.
  • 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.
  • 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. 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.
  • the control device of the wastewater disinfection device includes a rainfall information measuring means for measuring rainfall information in the processing area or the processing area and the adjacent processing area, and the rainfall start time, rainfall in the processing area from the rainfall 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.
  • the regional characteristics for predicting the amount of influent water flowing into the drainage disinfection device and the inflow pollution load 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. .
  • 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.
  • the control device of the above-described disinfection device is provided with turbidity measurement means for measuring the inflow turbidity of the water to be treated flowing into the disinfection device. 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.
  • the amount of added drug, the amount of drug consumed, and the disinfection device are calculated from the rainfall start time, the total amount of rainfall and the duration of rainfall predicted by the rainfall information prediction processing means, and the inflow water turbidity measured by the turbidity measuring 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.
  • the present invention provides a control device for a disinfection device that disinfects sewage within a treatment area, sewage containing rainwater, drainage containing rainwater flowing down the surface of the earth, etc., particularly sewer stormwater overflow with chemicals.
  • regional characteristic simulation means for predicting inflow pollution load
  • chemical addition rate setting means for setting the chemical addition rate for wastewater in advance
  • 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.
  • 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.
  • 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.
  • 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.
  • Fig. 42 is a diagram showing a sewer network for collecting waste water to be sterilized by the disinfecting apparatus of the above-described form, a treatment area, and an adjacent treatment area.
  • the treatment area A, B, C, D, E with a similar sewage treatment plant is located around the treatment area X of the 710 sewage treatment plant 710 where sewage overflow water disinfection equipment is installed.
  • the basic configuration of the sewage pipe network in this embodiment is the same as that of the sewage pipe network shown in FIG.
  • FIG. 43 is a diagram showing a configuration example of the control device of the wastewater disinfection device according to the present invention.
  • a plurality of rainfall information measuring means 720, 720 a plurality of rainfall information measuring means 720, 720.
  • 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.
  • 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.
  • Figure 44 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 mapped into a schematic diagram as shown in FIG. 44 (a) by the rain information mapping processing means 731.
  • the schematic diagram will be shown later in Fig. 44 (b). Note that the rainfall information that has been mapped is represented by the intensity of rainfall intensity as shown by A! /.
  • 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.
  • the amount of rainfall 753, the rainfall intensity 754, the amount of inflow of effluent flowing into the drainage 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.
  • 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 736 a, 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.
  • the control device 730 operates the drainage disinfection device based on the predicted values of the drug addition amount 741, the drug consumption amount 742, and the drainage disinfection device operation start time 743 obtained by adding the correction values. , Control of drug addition amount and drug consumption amount.
  • 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.
  • 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, 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.
  • the 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.
  • 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 discharged water, and the correction value calorie calculation processing means
  • 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. 45 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. 45 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.
  • Rainfall information 721 ⁇ , 722 ⁇ ⁇ such as rainfall amount and rainfall intensity measured by each rainfall information measuring means 720 in 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, the above-mentioned rainfall information 721 ⁇ , 722 ⁇ ⁇ is input to perform hydraulic analysis.
  • the regional characteristic simulation means 760 obtains an estimated inflow amount 761 of wastewater flowing into the wastewater disinfection device and an expected inflow pollution load 762 from rainfall information 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.
  • 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.
  • Predicted value Z actual value correction processing means 737 is input with the rainfall amount of 753, the rainfall intensity of 754, the inflow water amount of 755, the chemical supply amount of 756, the residual chemical concentration of the effluent water 757, the expected inflow amount 761 and the predicted inflow. From the pollutant load 762, find correction values to correct the drug addition amount 736a, the drug consumption amount 736b, and the 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.
  • 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.
  • 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 obtained from the estimated inflow water amount 762, the chemical addition amount 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.
  • 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.
  • FIG. 46 is a diagram showing another configuration example of the control device of the disinfection device.
  • the rainfall information 72 1 ⁇ , 722 ⁇ ... 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.
  • the regional characteristic simulation means 760 obtains the estimated inflow quantity 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.
  • 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.
  • the amount of rainfall 753, the rainfall intensity 754, the amount of inflow 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.
  • 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.
  • the rainfall information 721x, 722x ... force measured by each rainfall information measuring means 720 in the treated 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.
  • the sterilization apparatus for sewer overflow in rainy weather has an abnormality detection mechanism (solid bromine-based disinfectant addition amount detection means) that can detect an excess or an excess of the solid bromine-based disinfectant addition amount. You can get rid of it.
  • an abnormality detection mechanism solid bromine-based disinfectant addition amount detection means
  • 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 ⁇ value and / or comparing both residual halogen concentrations. It is means to do.
  • the amount of addition of the halogen-based chemical is excessive or too small.
  • Detect. 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.
  • the solid bromine-based disinfectant addition amount detection means detects the excess of 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.
  • 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.
  • 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. 47 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.
  • 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. .
  • 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.
  • 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.
  • 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.
  • 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.
  • abnormality detection means are installed in order to quickly and surely prevent excessive sterilization or sterilization failure of treated water when performing the above-mentioned sterilization. .
  • 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.
  • 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 drug-added calorie is added according to the processing procedure shown in FIG. Detect excess or underdose.
  • 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.
  • the residual halogen concentration determination process flow of FIG. 48 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 is set to 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.
  • 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.
  • 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.
  • 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.
  • the residual halogen concentration measured in the dissolution tank 841 that is, the residual halogen concentration measured in the waste water immediately after the addition of the halogen-based chemical agent
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 beforehand.
  • Number-discharge amount conversion coefficient The ratio between the powder drug discharge amount obtained by multiplying 910 and the powder drug consumption amount for which the differential force of the hopper weight 835 at time t and time t + k is also set in advance. If the drug discharge amount addition level is lower than the value 911, it is determined that the drug addition amount is too low, and the drug addition amount underdetermination output 881 is output.
  • the amount of powder medicine consumed which also obtained the differential force of the hot bar weight 835, and the amount of powder medicine discharged from the feeder rotation speed 836 should match, but the powder obtained from the difference of the hopper weight 835
  • the fact that the amount of powdered drug discharged from the feeder rotation speed 836 is larger than the amount of drug consumed means that the amount of powdered drug discharge determined from the feeder rotation speed 836 is greater than the amount discharged from the actual discharge.
  • the amount of powder medicine discharge cannot be obtained depending on the rotational speed 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 it is not possible to obtain a predetermined powder medicine discharge amount due to a mechanical failure of the feeder 833, that is, the medicine addition amount is too small. .
  • the outlet monitoring camera 814 is installed at the outlet of the outlet channel 811.
  • the video data of the outlet monitoring camera 814 and the fish determination set in advance are performed.
  • Pattern comparison with pattern 921 is performed, and similar video patterns are determined to be fish inhabiting discharge channel 811.
  • 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 ⁇ , 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.
  • the output 870, 871, 881, 88 2, 890 regarding the excess or under-determined amount of 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.
  • the solid bromine-based disinfectant storage tank 951 is installed on a force cell (load cell) 953, and the disinfectant supply speed becomes abnormally fast due to a failure of the cutting device 952.
  • the abnormal supply is detected by the detector 956, the emergency supply stop device 955 is operated, and the supply of the solid bromine disinfectant from the supply pipe 954 is stopped. It is possible to prevent the environment around the outlet from deteriorating due to the residual halogen being supplied in an abnormally large amount.
  • 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. Sewer overflow in the rainy target to be treated Hydropower
  • the pumping station has a sand basin or rainwater storage facility.
  • the movable gate 962 opens and the rainwater-mixed sewage 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.
  • 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.
  • 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. .
  • 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.
  • a force showing a method in which solid bromine-based disinfectant is dissolved in water to form disinfecting water and this is thrown into sewer stormwater overflow 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.
  • a remote management facility such as a central control room and control it remotely at the management facility.
  • the disinfectant input can be controlled unattended at the site of the drainage overflow drainage facility in rainy weather.
  • Figure 53 shows the concept of such a control system.
  • control unit such as a sequencer built in 02.
  • Chemical feeder 1003 is a powder fluidizer (including load cell), powder fluidizer, chemical feeder
  • Raw water turbidity meter 1004 always outputs the turbidity of incoming raw water.
  • Dissolved water flow meter 1005 always outputs the amount of water for chemical dissolution.
  • Residual halogen meter 1007 always outputs the residual halogen concentration of the discharged water.
  • Power control panel 1002 performs the following control.
  • 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.
  • 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.
  • 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.
  • the injection amount of the disinfectant after the start of discharge is gradually reduced in several stages by a timer.
  • the injection rate of the disinfectant is 10 mg / L, 7 mg / L, 5 mg / L, 3 mg, divided into 4 stages of 0—1 hour, 1—3 hours, 3—5 hours, 5 hours, 1 hour, 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.
  • 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.
  • 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.
  • 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.
  • BCDMH exerted a bactericidal effect at a concentration of 1Z2 or less compared to sodium hypochlorite, and the addition of 1 mg / L as CI was able to reduce the number of coliforms to 3000 CFU / mL or less.
  • Trihalomethane was less than 0.1 mg / L under the condition that BCDMH was added with lmg / L as CI.
  • the disinfectant addition rate shall be expressed in terms of 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.
  • BCDMH showed a sufficient effect in 1 minute, whereas sodium hypochlorite required more than 5 minutes.
  • 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.
  • Organic nitrogen refers to the value of organic nitrogen as a whole in addition to ammine.
  • 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.
  • 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.
  • 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.
  • 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.
  • RUN3 sewage volume 530m 3 / hour
  • BCDMH sewage volume 530m 3 / hour
  • 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.
  • RUN4 (sewer 250m 3 / hour) is a comparative example using sodium hypochlorite as a chlorinated disinfectant. In RUN4, even if the sodium hypochlorite supplemented 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 and LC value. (Specifically, it is higher and inappropriate than chlorine (C1) 0.4 mg / L)
  • the disinfection device shown in Fig. 54 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.
  • a disinfectant powdery 1-promo 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.
  • the sterilization treatment according to the method of the present invention was carried out on the rainwater overflow in the sewage treatment facility that created Figure 34- Figure 38.
  • the disinfection apparatus an apparatus having the configuration shown in FIG. 39 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
  • the concentration of the added disinfectant was increased.
  • 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 55. 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)! /.

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  • Activated Sludge Processes (AREA)

Abstract

L’invention concerne un système d’égout ayant un moyen permettant de stériliser rapidement des eaux d'égout mélangées à l’eau de pluie et de l’eau de pluie mélangée à un polluant libérées sans passer par une unité de traitement des eaux d’égout lors de fortes précipitations, dans des eaux publiques, et un procédé et un dispositif permettant de stériliser les eaux d’égout mélangées à l’eau de pluie de même que l’eau de pluie mélangée à un polluant. Dans un mode de réalisation de la présente invention, lorsque des eaux d’égout contenant une eau de pluie d’une quantité dépassant la capacité de traitement de l’unité de traitement des eaux d’égout s’écoulent dans l’unité de traitement des eaux d’égout ou peut s’écouler dans celle-ci du fait de la grande quantité de précipitations, les eaux d’égout mélangées à l’eau de pluie d’une quantité dépassant la quantité de traitement de l’unité de traitement des eaux d’égout sont ramifiées dans un équipement d’égout pour exclure le trop-plein d'eaux d’égout lors de précipitations et, après stérilisation avec un produit à base de brome, libérées dans les eaux publiques.
PCT/JP2004/017232 2004-11-19 2004-11-19 Système d’égout WO2006054351A1 (fr)

Priority Applications (3)

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PCT/JP2004/017232 WO2006054351A1 (fr) 2004-11-19 2004-11-19 Système d’égout
JP2006544781A JPWO2006054373A1 (ja) 2004-11-19 2005-05-31 下水処理装置及び方法
PCT/JP2005/009959 WO2006054373A1 (fr) 2004-11-19 2005-05-31 Station et procede d’epuration des eaux usees

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CN108967126A (zh) * 2018-09-05 2018-12-11 上海市绿化管理指导站 高架桥下雨水浇灌系统及方法
CN115806345A (zh) * 2022-12-14 2023-03-17 中国长江三峡集团有限公司 用于径流污水原位处理的复合微生物系统及方法

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JP6622432B1 (ja) * 2019-02-13 2019-12-18 水ｉｎｇ株式会社 アンモニア性窒素含有排水の消毒装置及び消毒方法

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CN115806345A (zh) * 2022-12-14 2023-03-17 中国长江三峡集团有限公司 用于径流污水原位处理的复合微生物系统及方法
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