CN113998847A

CN113998847A - Electrochemical pretreatment SBR sewage treatment device and method

Info

Publication number: CN113998847A
Application number: CN202111520052.8A
Authority: CN
Inventors: 柏永生; 常江; 苏博君; 王佳伟; 崔保聪; 韩军; 师路远; 孙冀垆; 王欢欢
Original assignee: Beijing Drainage Group Co Ltd
Current assignee: Beijing Drainage Group Co Ltd
Priority date: 2021-12-13
Filing date: 2021-12-13
Publication date: 2022-02-01

Abstract

The invention provides an electrochemical pretreatment SBR sewage treatment device and method, comprising the following steps: a main water inlet pipe, a sedimentation tank, an intermediate water tank, an adjusting tank, an SBR tank and a clean water tank which are connected in sequence; one end of the three-dimensional electrocatalytic oxidation unit reactor is connected to the intermediate water tank through a first water inlet pipe, and the other end of the three-dimensional electrocatalytic oxidation unit reactor is connected to the regulating tank through a first water outlet pipe; the adjusting tank is connected to the SBR tank through a second water inlet pipe and is connected to a three-dimensional electroflocculation dephosphorization unit reactor arranged in the sedimentation tank through a return pipe. The technical scheme of the invention has the beneficial effects that the purpose of efficient sewage treatment is achieved through the combined action of electrochemical flocculation and electrocatalytic oxidation, the method is particularly suitable for high-ammonia nitrogen and low-C/N ratio domestic sewage treatment, the total nitrogen and total phosphorus removal efficiency is high, the sludge yield after sewage treatment is low, and the excess sludge treatment cost can be saved.

Description

Electrochemical pretreatment SBR sewage treatment device and method

Technical Field

The invention belongs to the technical field of wastewater treatment, and particularly relates to an electrochemical pretreatment SBR sewage treatment device and method.

Background

At present, the sewage treatment and discharge standards of various regions are becoming strict day by day, the problem of pollution of water sources and places of sensitive regions is prominent, and the treatment requirements are urgent. The traditional biological nitrogen and phosphorus removal method can meet the requirement of biological nitrogen and phosphorus removal on a carbon source only when the BOD5/TN value of the original sewage is more than 4-6 and the BOD5/TP value is more than 20, and the sewage with COD less than 200mg/L and COD/TN less than 8 is generally called low-carbon source sewage. For high-ammonia nitrogen low-carbon source domestic sewage with high ammonia nitrogen content and extremely low C/N ratio, the application of the biological nitrogen and phosphorus removal process has the problems of longer retention time, higher adding cost of carbon source, alkalinity and other agents, increase of sludge yield and oxygen consumption and the like, and further increases the investment and operation cost and operation difficulty of decentralized sewage treatment engineering. Therefore, the economic and efficient synchronous nitrogen and phosphorus removal sewage treatment process developed aiming at the low-carbon-source distributed domestic sewage has a very good application prospect.

The electrochemical oxidation method has the advantages of small occupied area, capability of improving B/C, sterilization and disinfection functions, small influence of temperature, simplicity in operation, easiness in control, no sludge generation, no need of additional medicament, less sludge production, direct oxidation of most of ammonia nitrogen into nitrogen and the like, and thus has attracted extensive attention. The two-dimensional electrooxidation mostly depends on the indirect oxidation of the anode to achieve the purpose of removing ammonia nitrogen, and has the defects of low current efficiency and high energy consumption.

Two-dimensional electroflocculation is started to be applied in the field of distributed sewage dephosphorization step by step, but the problems that the energy consumption is high, the total phosphorus in effluent can not reach higher discharge standard and the like still exist. Therefore, based on the current state of development of the above technologies, a new electrochemical pretreatment SBR sewage treatment apparatus and method with good application prospects are needed.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides an SBR sewage treatment device and method for electrochemical pretreatment. The purpose of efficient sewage treatment is achieved through the combined action of electrochemical flocculation of the three-dimensional electrocoagulation phosphorus removal unit reactor and electrocatalytic oxidation of the three-dimensional electrocatalytic oxidation unit reactor, the device is particularly suitable for high-ammonia nitrogen and low-C/N ratio domestic sewage treatment, and has the advantages of high nitrogen and phosphorus removal efficiency, short hydraulic retention time, low investment and operation cost, simplicity in operation control, small temperature influence, energy conservation, environmental friendliness and the like.

In order to achieve the purpose, the technical scheme of the invention is as follows:

an electrochemical pretreatment SBR sewage treatment device, comprising:

a main water inlet pipe, a sedimentation tank, an intermediate water tank, an adjusting tank, an SBR tank and a clean water tank which are connected in sequence;

one end of the three-dimensional electrocatalytic oxidation unit reactor is connected to the intermediate water tank through a first water inlet pipe, and the other end of the three-dimensional electrocatalytic oxidation unit reactor is connected to the regulating tank through a first water outlet pipe;

the adjusting tank is connected to the SBR tank through a second water inlet pipe, and is connected to a three-dimensional electroflocculation dephosphorization unit reactor arranged in the sedimentation tank through a return pipe.

Preferably, a plurality of groups of first cathode plates, a plurality of groups of first anode plates, a first particle electrode and a first filter plate are arranged in the three-dimensional electrocatalytic oxidation unit reactor;

the multiple groups of first cathode plates, the multiple groups of first anode plates, the first particle electrodes and the first filter plate are arranged between a first water inlet pipe and a first water outlet pipe of the three-dimensional electrocatalytic oxidation unit reactor;

the multiunit first negative plate and multiunit first anode plate sets up in the past to be connected with the negative pole and the positive pole of first power, first particle electrode sets up in the multiunit first negative plate and multiunit between the first anode plate, first filter plate sets up in the multiunit first negative plate and multiunit the upper end and the lower extreme of first anode plate, first power includes the bidirectional pulse power.

Preferably, a second anode plate, a second cathode plate, a second particle electrode and a second filter plate are arranged in the three-dimensional electroflocculation dephosphorization unit reactor;

the second negative plate with the second anode plate is connected with the negative pole and the positive pole of second power respectively, the second particle electrode set up in the second negative plate with between the second anode plate, the second filter plate set up in the second negative plate with the upper end and the lower extreme of second anode plate, the second power includes two-way pulse power.

Preferably, the front half part of the sedimentation tank, which is separated by the first partition plate, is set as a slag separation zone, the slag separation zone is provided with the three-dimensional electroflocculation phosphorus removal unit reactor and a basket grid, the lower part of the sedimentation tank is provided with a sludge hopper, one side of the sedimentation tank, which is close to the middle water tank, is provided with a sedimentation tank effluent weir, and the effluent height of the sedimentation tank effluent weir is lower than the top height of the three-dimensional electroflocculation phosphorus removal unit reactor.

Preferably, the intermediate water tank is provided with a first liquid level meter and a second partition plate, the intermediate water tank and the regulating tank can be separated through the second partition plate, and the height of the second partition plate is lower than the effluent height of the effluent weir of the sedimentation tank;

and an electrooxidation water inlet pump is arranged on the first water inlet pipe.

Preferably, the equalizing basin passes through the second advances water piping connection to SBR pond water-locator, be equipped with the SBR intake pump on the second inlet tube, be provided with the second level gauge in the equalizing basin.

Preferably, a filler component is arranged in the SBR pool, and a biological film is attached to the surface of the filler component;

the lower part of the SBR tank is provided with a jet aerator which is connected with an air source through a first air inlet pipeline, and the first air inlet pipeline is provided with a first electric valve;

the SBR pond is close to one side in clean water basin is provided with SBR play weir, the SBR pond is connected to through the mud pipe the sedimentation tank.

Preferably, an ultrafiltration membrane component is arranged in the clean water tank;

the bottom of the ultrafiltration membrane component is provided with the aeration pipe, the aeration pipe is connected with an air source through a second air inlet pipeline, and a second electric valve is arranged on the second air inlet pipeline;

the clean water tank is connected to the sedimentation tank through a sludge discharge pipe.

The invention also provides an electrochemical pretreatment SBR sewage treatment method, which utilizes the electrochemical pretreatment SBR sewage treatment device and comprises the following steps:

starting the electrochemical pretreatment SBR sewage treatment device, and enabling sewage to pass through the electrochemical pretreatment SBR sewage treatment device through a main water inlet pipe;

making the sewage sequentially pass through a sedimentation tank, an intermediate water tank, a three-dimensional electrocatalytic oxidation unit reactor, a regulating tank, an SBR tank and a clean water tank;

and a part of sewage flowing into the SBR tank is refluxed to the three-dimensional electroflocculation dephosphorization unit reactor through a reflux pipe.

Preferably, the method further comprises the following steps: flushing the three-dimensional electrocatalytic oxidation unit reactor and the three-dimensional electrocoagulation phosphorus removal unit reactor, wherein flushing the three-dimensional electrocatalytic oxidation unit reactor and the three-dimensional electrocoagulation phosphorus removal unit reactor comprises increasing aeration of the three-dimensional electrocatalytic oxidation unit reactor and the three-dimensional electrocoagulation phosphorus removal unit reactor.

The technical scheme of the invention has the beneficial effects that:

1. the invention achieves the purpose of high-efficiency sewage treatment by the combined action of electrochemical flocculation of the three-dimensional electrocoagulation phosphorus removal unit reactor and electrocatalytic oxidation of the three-dimensional electrocatalytic oxidation unit reactor, is particularly suitable for high-ammonia nitrogen and low-C/N ratio domestic sewage treatment, has high total nitrogen and total phosphorus removal efficiency, can obviously enhance the phosphorus and nitrogen removal effect of the dispersed high-ammonia nitrogen and low-carbon source domestic sewage, can obviously reduce the consumption of medicaments such as carbon source, alkalinity and the like compared with the traditional biochemical process, can save the operation cost by 20-30 percent, simultaneously connects a return pipe on an SBR water inlet pump to the three-dimensional electrocoagulation phosphorus removal unit reactor, can reduce the total phosphorus of inlet water in the pretreatment stage, and reduces the energy consumption of a biochemical stage.

2. Compared with an electric flocculation system consuming a plate electrode and a two-dimensional electric oxidation system depending on anode indirect oxidation, the three-dimensional electric flocculation phosphorus removal unit reactor and the three-dimensional electric catalytic oxidation unit reactor adopted by the invention sacrifice electrodes as particle electrodes, and the method has the advantages of good treatment effect, low energy consumption, easy supplement and replacement of the particle electrodes and the like.

3. The SBR tank adopts jet aeration, avoids dissolved oxygen lifting caused by aeration during anoxic stirring, is convenient for controlling dissolved oxygen in the reactor, and is particularly suitable for small-sized distributed sewage treatment.

4. The invention also adopts the filler component, and the biomembrane is attached to the filler component to form a mud-film composite IFAS process, so that the biomass can be improved, the impact load resistance of the system can be obviously improved, and part of microorganisms can be fixed, thereby solving the problem of long generation cycle of nitrobacteria to a certain extent. The total hydraulic retention time can be reduced to be within 10h by the combined denitrification and dephosphorization process of electrochemistry and biological action, and the engineering construction cost is obviously reduced.

5. The rear end of the invention is provided with the ultrafiltration membrane component, and the wastewater is discharged after being filtered by the ultrafiltration membrane component, so that suspended matters in the wastewater can be effectively removed, the water quality is ensured to be stable and reach the standard, the invention is used for the advanced treatment of SBR wastewater, the stricter wastewater standard can be met, and the application range of the process is expanded.

6. The invention can adopt a bidirectional pulse power supply, which not only effectively prevents the electrode from being passivated, but also can reduce 15-35% of power consumption compared with a common power supply.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.

FIG. 1 is a schematic structural diagram of an electrochemical pretreatment SBR sewage treatment device provided by an embodiment of the invention;

FIG. 2 is a schematic diagram of the steps of an electrochemical pretreatment SBR sewage treatment method according to another embodiment of the present invention.

Description of reference numerals:

1. a main water inlet pipe; 2. a basket grid; 3. a sludge hopper; 4. a sedimentation tank effluent weir; 5. electro-oxidation water inlet pump; 61. a first liquid level meter; 62. a second level gauge; 7. an SBR water inlet pipe; 8. a return pipe; 9. a water distributor of the SBR pool; 10. a packing assembly; 11. an SBR effluent weir; 12. an ultrafiltration membrane module; 13. a sludge discharge pump; 14. discharging the water pump; 15. a first power supply; 16. a first cathode plate; 17. a first anode plate; 18. a first particle electrode; 19. a first filter plate; 20. a second power supply; 21. a second cathode plate; 22. a second anode plate; 23. a second particle electrode; 24. a gas source; 25. an electrically operated valve; 26. an aeration pipe; 27. a jet aerator; 28. a sedimentation tank; 29. a middle water tank; 30. a regulating tank; 31. an SBR pool; 32. a clean water tank; 33. a three-dimensional electrocatalytic oxidation unit reactor; 34. a three-dimensional electroflocculation dephosphorization unit reactor; 35. an SBR water inlet pump; 36. a first electrically operated valve; 37. a second electrically operated valve; 38. a first water inlet pipe; 39. a first water outlet pipe; 40. a second water inlet pipe; 41. a first air intake line; 42. a second inlet line.

Detailed Description

In the existing research, the method for reducing energy consumption by adding electrolyte is difficult to be converted and applied in the field of domestic sewage treatment, and the research aiming at the three-dimensional electrode gradually draws attention at home and abroad. Compared with the traditional two-dimensional electrode, the three-dimensional electrode method has the advantages that the particle electrode is introduced, the electrode surface area and the reaction rate are effectively increased, the reaction speed is higher, the occupied area is smaller, the lower energy consumption efficiency ratio can be realized without adding electrolyte, the secondary pollution is avoided, the method can be used independently or in combination with other technologies, and the standard productization is easy. At present, the method for optimizing the three-dimensional electrocatalytic oxidation technology mainly focuses on developing efficient particle electrodes, catalysts, polar plate materials, reaction devices and the like, and the optimization of an operation control system is not paid enough attention. And by a proper means, the operation control system is optimized, so that the electrocatalytic oxidation reaction is kept to be carried out at a high-efficiency section, and the device and the method have higher operability in practical engineering application, so that the development of an economical and efficient distributed sewage pretreatment deamination device and method based on a three-dimensional electrocatalytic oxidation deamination technology has important practical significance.

The biological treatment is the most commonly used sewage treatment process at present, wherein the SBR process is a common process for village and town sewage, has the advantages of simple flow, low operation cost, good solid-liquid separation effect, good effluent quality, flexible operation, stable effect, good denitrification and dephosphorization effect, effective prevention of sludge bulking, impact load resistance and the like, and has remarkable advantages when being combined with the pretreatment of the three-dimensional electrocatalytic oxidation process. The NSBR technology developed for the distributed sewage treatment of the insensitive area cancels the complex structural form of the traditional SBR technology depending on the water outlet of a decanter, keeps ideal plug flow and ideal sedimentation, has the advantages of flexible operation mode, easy automatic control, unattended operation, simple structure and working procedure, high reliability, no surge and shake of a constant water level operation blower, good denitrification and dephosphorization effect, less equipment investment, energy conservation, reasonable product manufacturing and operation cost and the like, and is particularly suitable for small-sized distributed sewage treatment.

And compared with two-dimensional electric flocculation, the three-dimensional electric flocculation has the advantages of higher specific surface area of an electrode, lower energy consumption, higher removal efficiency and the like. Therefore, the economic and efficient sewage treatment dephosphorization device and method based on the three-dimensional electrocoagulation technology have important practical significance.

Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

As shown in FIG. 1, the present invention provides an SBR sewage treatment device with electrochemical pretreatment, comprising:

a main water inlet pipe 1, a sedimentation tank 28, an intermediate water tank 29, an adjusting tank 30, an SBR tank 31 and a clean water tank 32 which are connected in sequence;

a three-dimensional electrocatalytic oxidation unit reactor 33, wherein one end of the three-dimensional electrocatalytic oxidation unit reactor 33 is connected to the intermediate water tank 29 through a first water inlet pipe 38, and the other end of the three-dimensional electrocatalytic oxidation unit reactor 33 is connected to the regulating tank 30 through a first water outlet pipe 39;

the adjusting tank 30 is connected to the SBR tank 31 through a second water inlet pipe 40, and is connected to the three-dimensional electroflocculation dephosphorization unit reactor 34 arranged in the sedimentation tank 28 through a return pipe 8.

Specifically, a main water inlet pipe 1, a sedimentation tank 28, a middle water tank 29, an adjusting tank 30, an SBR tank 31 and a clean water tank 32 are sequentially connected, and a three-dimensional electrocatalytic oxidation unit reactor 33 is installed between the sedimentation tank 28 and the adjusting tank 30 as a flow measurement process. The sewage is sent into the three-dimensional electrocatalytic oxidation unit reactor 33 from the main water inlet pipe 1, under the action of catalytic oxidation, ammonia nitrogen in the sewage is oxidized and mainly converted into nitrogen to be directly removed, and nonbiodegradable organic matters are converted into biodegradable organic matters, so that the biodegradability of the sewage is improved, and the removal rate of the ammonia nitrogen in the effluent of the three-dimensional electrocatalytic oxidation unit reactor 33 is 40-60%. The operating parameters of the three-dimensional electrocatalytic oxidation unit reactor 33 are determined according to the ammonia nitrogen removal rate in the effluent of the three-dimensional electrocatalytic oxidation unit reactor 33. A part of the inlet water flowing to the SBR tank 31 in the adjusting tank 30 flows back to the three-dimensional electroflocculation dephosphorization unit reactor 34 in the sedimentation tank 28 through the return pipe 8, the three-dimensional electroflocculation dephosphorization unit reactor 34 is an upward flow reactor, the water inlet pipe is arranged at the bottom of the three-dimensional electroflocculation dephosphorization unit reactor, the water is overflowed from the top, and the inlet water of the three-dimensional electroflocculation dephosphorization unit reactor 34 is returned from the SBR inlet pump 35. The water treated by the SBR tank 31 enters the clean water tank 32, is pumped by the water pump, and is discharged after being filtered from the clean water tank 32, so that suspended matters in the water can be effectively removed, and the water quality is guaranteed to be stable and reach the standard. The invention achieves the purpose of high-efficiency sewage treatment by the combined action of electrochemical flocculation of the three-dimensional electrocoagulation phosphorus removal unit reactor 34 and electrocatalytic oxidation of the three-dimensional electrocatalytic oxidation unit reactor 33, is particularly suitable for high ammonia nitrogen and low C/N ratio domestic sewage treatment, has high total nitrogen and total phosphorus removal efficiency, can obviously enhance the phosphorus and nitrogen removal effect of the dispersed high ammonia nitrogen and low carbon source domestic sewage, can obviously reduce the consumption of medicaments such as carbon source, alkalinity and the like compared with the traditional biochemical process, can save the operation cost by 20-30 percent, simultaneously connects the return pipe 8 of the SBR water inlet pump 35 arranged in the regulating tank 30 to the three-dimensional electrocoagulation phosphorus removal unit reactor 34, can reduce the total phosphorus of inlet water in the pretreatment stage and reduce the energy consumption of a biochemical stage.

Furthermore, the sedimentation tank 28, the middle water tank 29, the regulating tank 30, the SBR tank 31, the clean water tank 32, the three-dimensional electrocatalytic oxidation unit reactor 33 and the three-dimensional electrocoagulation dephosphorization unit reactor 34 are all made of high-molecular insulating materials, have high impermeability, good corrosion resistance, moisture resistance and mildew resistance, can prevent the corrosion of water vapor and chemical solvents to the base materials of the tank body, prevent the cracking and peeling of the tank body substrate, and have excellent chemical resistance durability.

Preferably, the high polymer insulating material can be anticorrosive epoxy resin, acid and alkali resistant epoxy resin, and glass flake resin cement.

In a preferred example, a plurality of sets of first cathode plates 16, a plurality of sets of first anode plates 17, first particle electrodes 18 and first filter plates 19 are arranged in the three-dimensional electrocatalytic oxidation unit reactor 33;

a plurality of groups of first cathode plates 16, a plurality of groups of first anode plates 17, first particle electrodes 18 and first filter plates 19 are arranged between a first water inlet pipe 38 and a first water outlet pipe 39 of the three-dimensional electrocatalytic oxidation unit reactor 33;

the multiple sets of first cathode plates 16 and the multiple sets of first anode plates 17 are arranged in a staggered mode and are connected with the negative pole and the positive pole of the first power supply 15, the first particle electrodes 18 are arranged between the multiple sets of first cathode plates 16 and the multiple sets of first anode plates 17, the first filter plates 19 are arranged at the upper ends and the lower ends of the multiple sets of first cathode plates 16 and the multiple sets of first anode plates 17, and the first power supply 15 comprises a bidirectional pulse power supply.

Specifically, a first water inlet pipe 38 of the three-dimensional electrocatalytic oxidation unit reactor 33 is arranged at the lower part of the tank body of the three-dimensional electrocatalytic oxidation unit reactor 33, and a first water outlet pipe 39 of the three-dimensional electrocatalytic oxidation unit reactor 33 and the first water inlet pipe 38 of the three-dimensional electrocatalytic oxidation unit reactor are arranged in a diagonal line; the first filter plates 19 are disposed at upper and lower ends of the plurality of sets of first cathode plates 16 and the plurality of sets of first anode plates 17, and are used for preventing the first particle electrodes 18 from being lost.

The first cathode plate 16 is preferably a titanium electrode, a titanium-based metal oxide coated electrode, or a stainless steel electrode; the first anode plate 17 is preferably a titanium electrode or a titanium-based metal oxide coated electrode. The electrode spacing between the first cathode plate 16 and the first anode plate 17 is 10-200 mm. The first cathode plate 16 and the first anode plate 17 are selected from a plate, a mesh plate, a perforated plate, a grid plate, a cylinder or a rod. The first particle electrode 18 has a particle diameter of 3 to 5 mm.

Further, the metal oxide coating is at least two of tin dioxide, zinc oxide, titanium dioxide and rare earth metal oxide.

Further, the first particle electrode 18 is a composite catalytic three-dimensional particle electrode; preferably, the composite catalytic three-dimensional particles are biomass activated carbon or coal activated carbon particles loaded or doped with multi-element catalysts; further preferably, the catalyst is at least two of tin dioxide, zinc oxide, titanium dioxide and rare earth metal oxides.

In a preferred example, a three-dimensional electroflocculation dephosphorization unit reactor 34 is provided with a second anode plate 22, a second cathode plate 21, a second particle electrode 23 and a second filter plate;

the second cathode plate 21 and the second anode plate 22 are respectively connected with the cathode and the anode of the second power supply 20, the second particle electrode 23 is arranged between the second cathode plate 21 and the second anode plate 22, the second filter plate is arranged at the upper end and the lower end of the second cathode plate 21 and the second anode plate 22, and the second power supply 20 comprises a bidirectional pulse power supply.

Specifically, the second filter plate is disposed at the upper and lower ends of the second cathode plate 21 and the second anode plate 22 to prevent the second particle electrode 23 from being lost.

The second cathode plate 21 is preferably a titanium electrode, a titanium-based metal oxide coated electrode, or a stainless steel electrode; the second anode plate 22 is preferably a titanium electrode or a titanium-based metal oxide coated electrode. The electrode spacing between the second cathode plate 21 and the second anode plate 22 is 10-200 mm. The second cathode plate 21 and the second anode plate 22 are selected from a plate, a mesh plate, a perforated plate, a grid plate, a cylinder or a rod. The particle diameter of the second particle electrode 23 is 5 to 8 mm.

Further, the second particle electrode 23 is a metal particle including at least one of magnesium, aluminum, iron, or an alloy particle thereof.

Specifically, the first power supply 15 and the second power supply 20 include a constant voltage source, a constant current source, a unidirectional pulse source, or a bidirectional pulse source;

furthermore, the preferred duty ratio of the bidirectional pulse source is 40-90%, the pulse frequency is 0.01-0.1Hz, the voltage is 5-36V, the electrifying time is more than or equal to 5min, and the pole-reversing time is less than or equal to 10 min. The voltage of the constant voltage source or the constant current source is 5-36V. Preferably, the duty ratio of the bidirectional pulse source is 90%, the pulse frequency is 0.1Hz, the voltage is 24V, the electrifying time is 15min, and the pole reversing time is 1 min.

In a preferred example, the first half part of the sedimentation tank 28 separated by the first partition plate is provided with a slag separation zone, the slag separation zone is provided with a three-dimensional electroflocculation dephosphorization unit reactor 34 and a basket grid 2, the lower part of the sedimentation tank 28 is provided with a sludge hopper 3, one side of the sedimentation tank 28 close to the middle water tank 29 is provided with a sedimentation tank effluent weir 4, and the effluent height of the sedimentation tank effluent weir 4 is lower than the top height of the three-dimensional electroflocculation dephosphorization unit reactor 34.

Specifically, the sedimentation tank 28 is partitioned by a first partition plate, and the front half part has a slag separation function and is a slag separation area. A basket grid 2 is arranged behind the main water inlet pipe 1, and the function of filtering impurities can be achieved. The slag separation zone is also provided with a three-dimensional electroflocculation dephosphorization unit reactor 34, the three-dimensional electroflocculation dephosphorization unit reactor 34 is an upward flow reactor, a water inlet pipe is arranged at the bottom of the three-dimensional electroflocculation dephosphorization unit reactor, water overflows from the top of the three-dimensional electroflocculation dephosphorization unit reactor through a sedimentation tank water outlet weir 4, and the inlet water of the three-dimensional electroflocculation dephosphorization unit reactor is the return water of a return pipe 8 provided with an SBR water inlet pump 35.

In a preferred example, the intermediate water tank 29 is provided with a first liquid level meter 61 and a second partition plate, the intermediate water tank 29 and the regulating tank 30 can be separated by the second partition plate, and the height of the second partition plate is lower than the effluent height of the effluent weir 4 of the sedimentation tank;

the first water inlet pipe 28 is provided with an electrooxidation water inlet pump 5.

Specifically, the intermediate water tank 29 is provided with an electrooxidation water inlet pump 5 and a first liquid level meter 61, and is also provided with a second partition plate which is slightly lower than the sedimentation tank water outlet weir 4 to separate the electrooxidation water inlet pump from the regulating tank 30, when the water inlet amount exceeds the processing capacity of the three-dimensional electrocatalytic oxidation unit reactor 33, sewage overflows from the second partition plate and enters the regulating tank 30, the regulating tank 30 is provided with a second liquid level meter 62 and an SBR water inlet pump 35, part of the sewage in the regulating tank 30 is connected to the SBR tank water distributor 9 through the SBR water inlet pump 35, and part of the sewage is connected to the three-dimensional electroflocculation phosphorus removal unit reactor 34 in the sedimentation tank 28 through a return pipe 8 to serve as inlet water.

In a preferred example, the regulating reservoir 30 is connected to the SBR water distributor 9 through a second water inlet pipe 40, an SBR water inlet pump 35 is arranged on the second water inlet pipe 40, and a second liquid level meter 62 is arranged in the regulating reservoir 30.

Specifically, the SBR tank 31 is filled with water by the SBR tank water distributor 9, the return pipe 8 is arranged at the middle upper part of the SBR tank water distributor 9, and the second liquid level meter 62 can be used for controlling the operation liquid level of the SBR tank 31 to prevent the loss of activated sludge.

In a preferred example, a packing component 10 is arranged in the SBR tank 31, and a biological film is attached to the surface of the packing component 10;

the lower part of the SBR tank 31 is provided with a jet aerator 27, the jet aerator 27 is connected with an air source 24 through a first air inlet pipeline 41, and the first air inlet pipeline 41 is provided with a first electric valve 36;

one side of SBR pond 31 near clean water pond 32 is provided with SBR play weir 11, and SBR pond 31 is connected to sedimentation tank 28 through mud pipe 13.

Specifically, the sewage which is not treated by the three-dimensional electrocatalytic oxidation unit reactor 33 is introduced into the SBR tank 31, aeration is maintained until a stable biological film is formed on the surface of the filler component 10, and a sludge-film composite IFAS process is formed, so that the biomass can be improved, the impact load resistance of the system can be obviously improved, and meanwhile, part of microorganisms are fixed and do not flow out of the system along with periodic sludge discharge, and the problem of long generation cycle of nitrobacteria is solved to a certain extent.

The SBR tank 31 is oxygenated by a jet aerator 27, and the conventional SBR process generally adopts forms of a microporous aerator, an aeration perforated pipe and the like to oxygenate the tank. Meanwhile, stirring is carried out in an aeration mode, so that the dissolved oxygen in the SBR tank 31 is difficult to control, and a strict anaerobic/anoxic state is difficult to achieve, and forced blowing type single-stage jet aerator 27 is preferably adopted for oxygenation and stirring. Jet aerator 27 is connected with air source 24 through a first air inlet pipeline, a first electric valve 36 is arranged on the air inlet pipeline, the air-water mixture and the high-efficiency oxygenation and stirring effects are achieved when first electric valve 36 is opened, and water flow can only stir SBR tank 31 when first electric valve 36 is closed.

The SBR tank 31 adopts the fixed SBR effluent weir 11 to discharge water, and has the advantages of simple structure, low failure rate, small disturbance to the water surface, large drainage ratio and the like compared with a water discharging mode adopting a decanter.

In a preferred example, an ultrafiltration membrane module 12 is arranged in the clean water tank 32;

an aeration pipe is arranged at the bottom of the ultrafiltration membrane component 12, the aeration pipe is connected with the air source 24 through a second air inlet pipeline 42, and a second electric valve 37 is arranged on the second air inlet pipeline 42;

the clean water tank 32 is connected to the settling tank 28 through the sludge discharge pipe 13.

Specifically, the ultrafiltration membrane component 12 is arranged in the clean water tank 32, water treated by the SBR tank 31 enters the clean water tank 32, is sucked by the water outlet pump 14, is filtered by the ultrafiltration membrane component 12 and then is discharged, suspended matters in the water can be effectively removed, the water outlet of the SBR tank 31 is used for advanced treatment, stricter water outlet standards can be met, and the application range of the process is expanded. The bottom of the device is provided with an aeration pipeline which is connected with an air source 24 through a second electric valve 37 and is used for cleaning the ultrafiltration membrane component 12.

The sludge-water mixture in the clean water tank 32 is pumped to the sedimentation tank 28 through the sludge pump 13 at regular intervals, so that the sludge yield after sewage treatment is low, and the cost for treating excess sludge can be saved.

The invention also provides an electrochemical pretreatment SBR sewage treatment method, which adopts the electrochemical pretreatment SBR sewage treatment device and comprises the following steps:

s1: starting the SBR sewage treatment device for electrochemical pretreatment, and introducing sewage into the SBR sewage treatment device for electrochemical pretreatment through a main water inlet pipe 1;

s2: making the sewage sequentially pass through a sedimentation tank 28, an intermediate water tank 29, a three-dimensional electrocatalytic oxidation unit reactor 33, a regulating tank 30, an SBR tank 31 and a clean water tank 32;

s3: and a part of the sewage flowing into the SBR tank 31 is returned to the three-dimensional electroflocculation dephosphorization unit reactor 34 through a return pipe 8.

Specifically, the sewage is sent into the three-dimensional electrocatalytic oxidation unit reactor 33 from the main water inlet pipe 1, under the catalytic oxidation action, ammonia nitrogen in the sewage is oxidized and mainly converted into nitrogen to be directly removed, and organic matters which are difficult to biodegrade are converted into organic matters which are easy to biodegrade, so that the biodegradability of the sewage is improved, and the removal rate of the ammonia nitrogen in the effluent of the three-dimensional electrocatalytic oxidation unit reactor 33 is 40-60%. The operating parameters of the three-dimensional electrocatalytic oxidation unit reactor 33 are determined according to the ammonia nitrogen removal rate in the effluent of the three-dimensional electrocatalytic oxidation unit reactor 33. The denitrification and dephosphorization process combining electrochemistry and biological action can reduce the total hydraulic retention time to be within 10 hours, and obviously reduce the engineering construction cost.

In step S1, starting the SBR sewage treatment device of electrochemical pretreatment, including film formation;

the biofilm culturing method comprises the steps of inoculating an inoculum into the SBR tank 31, introducing sewage which is not treated by the three-dimensional electrocatalytic oxidation unit reactor 33 into the SBR tank 31, and maintaining aeration until a stable biological film is formed on the surface of the filler component 10.

The operation parameters of the SBR sewage treatment device of the electrochemical pretreatment are determined according to the concentration of ammonia nitrogen in the effluent, so that the ammonia nitrogen in the effluent of the clean water tank 32 is less than 1.5mg/L, and the COD is less than 30 mg/L.

Preferably, the inoculum is return zone sludge of a town sewage treatment plant for removing impurities.

In a preferred example, the method also comprises an operation method of the SBR sewage treatment device for electrochemical pretreatment, wherein the operation period of the SBR comprises five time sequences of water inlet, reaction, aeration and precipitation, the time length of each time sequence is 40-60min, and the drainage ratio is 25-35%;

and the jet aeration electric valve is closed in the reaction time sequence, only the water flow generates the stirring effect, and the jet aeration electric valve is opened in the aeration time sequence to stir and oxygenate the SBR tank 31.

Preferably, the SBR operation period comprises five time sequences of water inlet, reaction, aeration and precipitation, wherein the time length of each time sequence is 60min, and the water discharge ratio is about 30%. The electric valve of the jet aeration is closed in the reaction time sequence, only the water flow generates the stirring effect, and the electric valve of the jet aerator 27 is opened in the aeration time sequence to stir and oxygenate the SBR tank 31.

A preferred example, further comprising: the three-dimensional electrocatalytic oxidation unit reactor 33 and the three-dimensional electrocoagulation phosphorus removal unit reactor 34 are washed, and the washing of the three-dimensional electrocatalytic oxidation unit reactor 33 and the three-dimensional electrocoagulation phosphorus removal unit reactor 34 comprises the improvement of aeration quantity of the three-dimensional electrocatalytic oxidation unit reactor 33 and the three-dimensional electrocoagulation phosphorus removal unit reactor 34.

Specifically, the method further comprises flushing the three-dimensional electrocatalytic oxidation unit reactor 33, wherein the flushing frequency is once every 3 to 7 days; the flushing method comprises the following steps of adjusting the gas-water ratio of the aeration rate of the three-dimensional electrocatalytic oxidation unit reactor 33 during operation to be (10-20): 1; and backwashing the three-dimensional electroflocculation dephosphorization unit reactor 34, wherein the backwashing frequency is once every 1-3 days;

the backwashing method comprises the following steps: and opening an electric valve of an aeration pipeline of the three-dimensional electroflocculation phosphorus removal unit reactor 34 periodically when water enters, so that the interior of the three-dimensional electroflocculation phosphorus removal unit reactor 34 is in a fluidized state, precipitates flow out of the three-dimensional electroflocculation phosphorus removal unit reactor 34 along with the water entering and are settled in a sludge hopper 3 of the sedimentation tank 28, and the aeration operation time of the three-dimensional electroflocculation phosphorus removal unit reactor 34 is 10-25 min.

Preferably, the backwashing frequency of the three-dimensional electroflocculation dephosphorization unit reactor is once per 3 days, and the aeration operation time of the three-dimensional electroflocculation dephosphorization unit reactor 34 is 10 min.

Preferably, the flushing method comprises the step of adjusting the aeration rate of the three-dimensional electrocatalytic oxidation unit reactor 33 during operation to 10: 1.

further, the power supply of the three-dimensional electrocatalytic oxidation unit reactor 33 is a bidirectional pulse power supply, and the operation method of the bidirectional pulse power supply of the three-dimensional electrocatalytic oxidation unit reactor 33 is that the bidirectional pulse power supply works when water enters, and the bidirectional pulse power supply is in standby state when the water enters, so that the energy consumption is saved; the power supply of the three-dimensional electroflocculation phosphorus removal unit reactor 34 is a bidirectional pulse power supply, and the operation method of the bidirectional pulse power supply of the three-dimensional electroflocculation phosphorus removal unit reactor 34 is that the bidirectional pulse power supply is linked with the SBR water inlet pump 35, the SBR water inlet pump 35 works when water enters, and the bidirectional pulse power supply stops waiting when water enters, so that energy consumption is saved. The invention can adopt a bidirectional pulse power supply, which not only effectively prevents the electrode from being passivated, but also can reduce 15-35% of power consumption compared with a common power supply.

Example 1

As shown in fig. 1, the present embodiment provides an electrochemical pretreatment SBR sewage treatment apparatus, comprising:

In this embodiment, the three-dimensional electrocatalytic oxidation unit reactor 33 is provided with a plurality of groups of first cathode plates 16, a plurality of groups of first anode plates 17, first particle electrodes 18 and first filter plates 19;

In this embodiment, the three-dimensional electroflocculation dephosphorization unit reactor 34 is provided with a second anode plate 22, a second cathode plate 21, a second particle electrode 23 and a second filter plate;

In this embodiment, the first half part of the sedimentation tank 28 separated by the first partition plate is set as a slag separation zone, the slag separation zone is provided with a three-dimensional electroflocculation phosphorus removal unit reactor 34 and a basket grid 2, the lower part of the sedimentation tank 28 is provided with a sludge hopper 3, one side of the sedimentation tank 28 close to the middle water tank 29 is provided with a sedimentation tank effluent weir 4, and the effluent height of the sedimentation tank effluent weir 4 is lower than the top height of the three-dimensional electroflocculation phosphorus removal unit reactor 34.

In this embodiment, the intermediate water tank 29 is provided with a first liquid level meter 61 and a second partition plate, the intermediate water tank 29 and the regulating tank 30 can be separated by the second partition plate, and the height of the second partition plate is lower than the effluent height of the effluent weir 4 of the sedimentation tank;

In this embodiment, the equalizing basin 30 is connected to the SBR basin water distributor 9 through the second water inlet pipe 40, the SBR water inlet pump 35 is arranged on the second water inlet pipe 40, and the second liquid level meter 62 is arranged in the equalizing basin 30.

In this embodiment, the SBR tank 31 is provided with a filler component 10, and a biofilm is attached to the surface of the filler component 10;

In this embodiment, the clear water tank 32 is provided with the ultrafiltration membrane module 12;

Example 2

As shown in fig. 2, this example provides an electrochemical pretreatment SBR sewage treatment method using the electrochemical pretreatment SBR sewage treatment apparatus of example 1, which is used to treat distributed domestic sewage of a high-speed service zone, which is a type of distributed domestic sewage having a small discharge water volume and a high biochemical cost, and has a typical water quality characteristic: COD 250mg/L, NH4+ -N100 mg/L, TN 150mg/L, TP-20 mg/L, COD/TN-1.67. The method comprises the following steps:

s3: and a part of sewage flowing into the SBR tank is refluxed to the three-dimensional electroflocculation dephosphorization unit reactor 34 through a reflux pipe 8.

In this embodiment, the method further includes: the three-dimensional electrocatalytic oxidation unit reactor 33 and the three-dimensional electrocoagulation phosphorus removal unit reactor 34 are washed, and the washing of the three-dimensional electrocatalytic oxidation unit reactor 33 and the three-dimensional electrocoagulation phosphorus removal unit reactor 34 comprises the improvement of aeration quantity of the three-dimensional electrocatalytic oxidation unit reactor 33 and the three-dimensional electrocoagulation phosphorus removal unit reactor 34.

And (3) carrying out five time sequences of water inlet, reaction, aeration and precipitation in the operation cycle of the SBR sewage treatment device subjected to electrochemical pretreatment, wherein the corresponding stages of the reaction time sequences are steps S2 and S3, the time length of each time sequence is set to be 60min, and the water discharge ratio is about 30%. The jet aeration electric valve is closed in the reaction time sequence, only the water flow generates the stirring effect, and the jet aeration electric valve is opened in the aeration time sequence to stir and oxygenate the SBR tank 31. The duty ratio of the bidirectional pulse source is 90%, the pulse frequency is 0.1Hz, the voltage is 24V, the electrifying time is 15min, and the pole reversing time is 1 min. The backwashing frequency of the three-dimensional electroflocculation dephosphorization unit reactor is one time per 3 days, and the aeration operation time of the three-dimensional electroflocculation dephosphorization unit reactor is 10 min. The aeration quantity of the three-dimensional electrocatalytic oxidation unit reactor during operation is adjusted to 10: 1.

the effluent quality of the SBR sewage treatment device of electrochemical pretreatment is as follows: the average COD value is 20mg/L, the average removal rate is 92%, the average NH4+ -N value is 0.8mg/L, the average removal rate is 99%, the average TN value is 12mg/L, the average removal rate is 92%, the average TP value is 0.3mg/L, the average removal rate is 98%, the effluent of the SBR sewage treatment device subjected to electrochemical pretreatment can stably reach the first grade A in the Beijing local standard (DB 11/1612) and 2019) except the impact load of pollutants.

Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. The utility model provides a SBR sewage treatment plant of electrochemistry preliminary treatment which characterized in that includes:

2. The SBR sewage treatment device of claim 1 wherein a plurality of sets of first cathode plates, a plurality of sets of first anode plates, a first particle electrode and a first filter plate are arranged in the three-dimensional electrocatalytic oxidation unit reactor;

3. The SBR sewage treatment device of claim 1, wherein a second anode plate, a second cathode plate, a second particle electrode and a second filter plate are arranged in the three-dimensional electroflocculation dephosphorization unit reactor;

4. The SBR sewage treatment device of claim 1, wherein the first half part of the sedimentation tank separated by the first partition plate is provided with a slag separation zone, the slag separation zone is provided with the three-dimensional electroflocculation dephosphorization unit reactor and a basket grid, the lower part of the sedimentation tank is provided with a sludge hopper, one side of the sedimentation tank close to the middle water tank is provided with a sedimentation tank effluent weir, and the effluent height of the sedimentation tank effluent weir is lower than the top height of the three-dimensional electroflocculation dephosphorization unit reactor.

5. The SBR sewage treatment device of claim 1 wherein the intermediate water tank is provided with a first liquid level gauge and a second partition by which the intermediate water tank and the adjusting tank can be separated, the second partition having a height lower than the effluent height of the sedimentation tank effluent weir;

6. The SBR sewage treatment device of claim 1 wherein the regulation tank is connected to the SBR tank water distributor through the second water inlet pipe, the second water inlet pipe is provided with an SBR water inlet pump, and the regulation tank is provided with a second liquid level meter.

7. The SBR sewage treatment device of claim 1 wherein a filler assembly is arranged in the SBR tank, and a biological membrane is attached to the surface of the filler assembly;

8. The SBR sewage treatment device of claim 1 wherein an ultrafiltration membrane module is arranged in the clean water tank;

9. An electrochemical pretreatment SBR sewage treatment method using the electrochemical pretreatment SBR sewage treatment device according to any one of claims 1 to 8, wherein the method comprises:

10. The method of electrochemical pretreatment of SBR sewage treatment as claimed in claim 9, further comprising: flushing the three-dimensional electrocatalytic oxidation unit reactor and the three-dimensional electrocoagulation phosphorus removal unit reactor, wherein flushing the three-dimensional electrocatalytic oxidation unit reactor and the three-dimensional electrocoagulation phosphorus removal unit reactor comprises increasing aeration of the three-dimensional electrocatalytic oxidation unit reactor and the three-dimensional electrocoagulation phosphorus removal unit reactor.