CN218709710U - Urban domestic wastewater electrochemical dephosphorization system - Google Patents

Abstract

The utility model discloses an electrochemical dephosphorization system for urban domestic wastewater, which relates to the technical field of sewage treatment and comprises a pretreatment unit, a biochemical treatment unit and a deep treatment unit which are connected in sequence; the pretreatment unit comprises a first pretreatment tank and a second pretreatment tank which are connected in sequence; the biochemical treatment unit comprises an anaerobic tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank which are connected in sequence; the deep treatment unit comprises a denitrification deep bed filter; the device also comprises an electrochemical phosphorus removal unit, wherein the electrochemical phosphorus removal unit is connected between the outlet end of the secondary sedimentation tank and the denitrification deep bed filter in parallel, the electrochemical phosphorus removal unit comprises a phosphorus removal tank, and an electrode plate is also arranged in the phosphorus removal tank. The utility model discloses enable domestic sewage and realize system dephosphorization and handle, make domestic sewage can not only realize the dephosphorization through this system when needs are handled, and can realize slagging-off in earlier stage and the later stage carries out the advanced treatment to the sewage after the dephosphorization, make domestic sewage handle systematization more.

Description

Urban domestic wastewater electrochemical dephosphorization system

Technical Field

The utility model relates to a sewage treatment technical field particularly, relates to a cities and towns domestic wastewater electrochemistry dephosphorization system.

Background

At present, domestic sewage in China is expanded from cities to vast rural areas, and non-point source pollution is increasingly serious. Urban domestic sewage is mainly discharged water produced by various kitchen water, washing water and toilet water used in human life, is mainly nontoxic inorganic salts, contains a large amount of suspended solid, chemically or biologically degradable soluble or colloidal dispersed organic matters, nitrogen-containing compounds, phosphates, potassium and sodium, heavy metal ions, bacteria and flora, and the like. In recent years, organic nitrogen and ammonia nitrogen in water consume dissolved oxygen in water, so that the water body is blackened and smelled; excessive nitrogen and phosphorus in the water body can cause eutrophication of the water body and worsen the water environment. In this regard, the national authorities have made increasingly strict controls on the nitrogen and phosphorus levels in wastewater. As the total nitrogen and the total phosphorus of the effluent of many sewage treatment plants exceed the national primary class A standard. Therefore, how to effectively reduce the concentration of phosphorus in the sewage has very important significance for eliminating pollution and protecting the environment.

At present, the municipal sewage treatment plant in China mostly adopts a chemical phosphorus removal method for total phosphorus, derives an enhanced coagulation technology, a super-magnetic separation technology and the like, and has the problems of large dosage, large sludge production, high sludge treatment cost, easy influence of water environment change on the phosphorus removal effect of chemical agents, toxicity of the chemical agents to aquatic organisms, secondary pollution of ecological systems and the like.

Therefore, a new system for advanced treatment of municipal wastewater is urgently needed to meet the discharge requirement of surface water.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a town domestic wastewater electrochemistry dephosphorization system to solve above-mentioned problem.

For realizing the purpose of the utility model, the technical proposal adopted is that: an electrochemical dephosphorization system for urban domestic wastewater comprises a pretreatment unit, a biochemical treatment unit and an advanced treatment unit which are connected in sequence;

the pretreatment unit comprises a first pretreatment tank and a second pretreatment tank which are connected in sequence;

the biochemical treatment unit comprises an anaerobic tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank which are connected in sequence;

the deep treatment unit comprises a denitrification deep bed filter;

the device also comprises an electrochemical phosphorus removal unit, wherein the electrochemical phosphorus removal unit is connected between the outlet end of the secondary sedimentation tank and the denitrification deep bed filter in parallel, the electrochemical phosphorus removal unit comprises a phosphorus removal tank, and an electrode plate is also arranged in the phosphorus removal tank.

Furthermore, the first pretreatment tank is separated into a plurality of primary treatment areas through a partition plate, and a sewage treatment coarse grid is arranged in the primary treatment area at the inlet end of the first pretreatment tank.

Furthermore, a secondary treatment area and an aeration sand setting area which are arranged at intervals are arranged in the second pretreatment tank, a sewage treatment fine grid and two gate plates are arranged in the secondary treatment area, the two gate plates are respectively positioned at the front side and the rear side of the sewage treatment fine grid, a water through hole for communicating the secondary treatment area with the aeration sand setting area is further formed in the second pretreatment tank, and a gate for opening or closing the water through hole is further arranged in the secondary treatment area; still be provided with first aeration subassembly in the aeration grit zone, and still be provided with the first air-blower to first aeration subassembly air feed on the second preliminary treatment pond.

Furthermore, an overflow area separated from the aeration sand settling area is further arranged in the second pretreatment tank, the second pretreatment tank is further provided with a baffle plate which is communicated with the aeration sand settling area and the overflow area, the aeration sand settling area is further internally provided with the baffle plate, the baffle plate is close to the inlet end of the overflow port, and the lower end of the baffle plate is lower than the height of the overflow port.

Further, all be provided with the mixer in anaerobism pond, the oxygen deficiency pond, still have the pencil that adds on the anaerobism pond, still be provided with second aeration subassembly in the good oxygen pond, and be connected with mixed liquid return line between good oxygen pond and the anaerobism pond, be connected with the mud back flow between second grade sedimentation tank and the anaerobism pond.

Furthermore, the electrochemical phosphorus removal unit further comprises a water drainage tank, the upper end of the phosphorus removal tank is communicated with the upper end of the water drainage tank, a support frame is further installed in the phosphorus removal tank, a plurality of electrode plates are arranged in the phosphorus removal tank, and the plurality of electrode plates are arranged on the support frame at intervals.

Furthermore, a sludge discharge pipe for discharging sludge and a water inlet pipe for water inlet are further arranged on the phosphorus removal tank, a water outlet pipe is further arranged on the water discharge tank, and the water outlet pipe is connected with the aerobic tank.

Furthermore, the inlet tube and the sludge discharge pipe are both positioned at the bottom of the dephosphorization tank, and the outlet end of the inlet tube is communicated with the inlet end of the sludge discharge pipe through a three-way joint.

Furthermore, the water outlet pipe is positioned in the middle of the water drainage tank, and a vent pipe is further arranged at the bottom of the water drainage tank.

Furthermore, electromagnetic valves are arranged on the sludge discharge pipe, the water inlet pipe, the water outlet pipe and the emptying pipe.

Furthermore, the number of the electrochemical phosphorus removal units is multiple, the multiple electrochemical phosphorus removal units are arranged in a rectangular array, and the multiple electrochemical phosphorus removal units are connected in parallel or connected in series in sequence.

Furthermore, the tank bottoms of the phosphorus removal tank and the water drainage tank are funnel-shaped, and the electrode plate is positioned in the middle of the phosphorus removal tank.

Furthermore, the plurality of electrode plates are arranged in an alternating manner of positive electrodes and negative electrodes.

Further, the electrode plate is a carbon steel plate or an iron plate or an aluminum plate.

Furthermore, the supporting frame is connected with the wall of the dephosphorization tank, and the electrode plate is connected with the supporting frame through clamping grooves.

Furthermore, the distance between two adjacent electrode plates is 1-12cm.

Furthermore, the device also comprises an intermediate water tank, wherein the intermediate water tank is positioned between the secondary sedimentation tank and the phosphorus removal tank, and the outlet end of the intermediate water tank is provided with a parallel pipeline which is connected with the inlet end of the denitrification deep bed filter in parallel.

Further, still include sludge treatment unit, sludge treatment unit is including the sludge thickening tank and the sludge dewatering computer lab that connect gradually, is connected with the mud conveyer pipe between anaerobism pond, second grade sedimentation tank and the sludge thickening tank.

Furthermore, a material tank, a sludge modification bin and a filter press which are connected in sequence are also installed in the sludge dewatering machine room, and the outlet end of the sludge concentration tank is connected with the inlet end of the sludge modification bin.

The utility model has the advantages that,

the utility model can realize dephosphorization by adopting the electrode plate in the dephosphorization tank, so that sewage does not need to be added with any medicament (physical medicament and chemical medicament) in the dephosphorization treatment process, thereby not only having high environmental friendliness, but also realizing thorough dephosphorization and greatly reducing the sludge production; meanwhile, the domestic sewage is subjected to systematic dephosphorization by matching with the pretreatment unit, the biochemical treatment unit and the advanced treatment unit, so that the domestic sewage can be subjected to dephosphorization by the system when needing to be treated, earlier-stage deslagging and later-stage advanced treatment on the dephosphorized sewage can be realized, the domestic sewage treatment is more systematic, and the treated sewage can be directly subjected to surface discharge.

The electromagnetic valves are arranged on the water inlet pipes of the multiple electrochemical phosphorus removal units, so that the water inflow of each electrochemical phosphorus removal unit can be accurately controlled, the multistage regulation and control of total phosphorus removal can be realized, the current density of the electrode plate can be regulated and controlled according to the water inflow, and the phosphorus removal is more efficient and thorough.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.

FIG. 1 is a system diagram of an electrochemical dephosphorization system for urban domestic wastewater provided by the utility model;

FIG. 2 is a system diagram of a pre-processing unit;

FIG. 3 is a schematic structural diagram of an electrochemical phosphorus removal unit;

FIG. 4 is a system diagram of a biochemical processing unit;

FIG. 5 is a system diagram of a depth processing unit;

FIG. 6 is a system diagram of a sludge treatment unit.

Reference numbers and corresponding part names in the drawings:

1. a first pretreatment tank, a second pretreatment tank, a 3 anaerobic tank, a 4 anoxic tank, a 5 aerobic tank, a 6 secondary sedimentation tank, a 7 intermediate water tank, a 8 dephosphorization tank, a 9 drainage tank, a 10 denitrification deep bed filter tank, a 11 fiber rotary disc filter tank, 12, an ultraviolet disinfection channel, 13, a sludge concentration tank, 14, a material tank, 15, a sludge modification bin, 16, a filter press, 17, a mixed liquid backflow pipeline, 18, a sludge conveying pipe, 19, a backflow pump, 20, a lifting pump, 21, a dosing pipe, 22 and a sludge backflow pipeline;

100. a primary treatment area 101, a sewage treatment coarse grid 102, a control valve group 103 and water through holes;

200. a secondary treatment area, 201, an aeration sand setting area, 202, a sewage treatment fine grid, 203, a gate plate, 204, a gate, 205, a first aeration component, 206, a first blower, 207, an overflow area, 208, an overflow port, 209 and a baffle plate;

300. a blender;

500. a second aeration assembly;

800. a water inlet pipe 801, a mud discharge pipe 803, a support frame 804 and an electrode plate;

900. outlet pipe, 901, blow-down pipe, 902, PLC automatic control cabinet, 903, switch board.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant disclosure and are not to be considered as limiting the invention. It should be noted that, for convenience of description, only the parts related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict. The present invention will be described in detail with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1 to fig. 6, the utility model provides an electrochemical dephosphorization system for urban domestic wastewater, which comprises a pretreatment unit, a biochemical treatment unit and a deep treatment unit which are connected in sequence; the pretreatment unit is used for removing dregs in the domestic sewage and creating conditions for subsequent biochemical treatment; the biochemical treatment unit is used for performing biochemical treatment on the sewage, so that sediments (sludge) in the sewage can be conveniently removed, and the sewage is subjected to denitrification and deamination; the advanced treatment unit is used for further removing nitrogen from the sewage after dephosphorization, deamination and denitrification so as to ensure that the treated sewage can be directly discharged.

The pretreatment unit comprises a first pretreatment tank 1 and a second pretreatment tank 2 which are sequentially connected, a tap water pipe network for discharging urban domestic sewage is directly connected with the first pretreatment tank 1, so that the sewage to be treated is directly sent into the first pretreatment tank 1 through the tap water pipe network, and is pretreated in the first pretreatment tank 1 and then sent into the second pretreatment tank 2 for secondary pretreatment; the biochemical treatment unit comprises an anaerobic tank 3, an anoxic tank 4, an aerobic tank 5 and a secondary sedimentation tank 6 which are connected in sequence, so that sewage subjected to secondary pretreatment is directly sent into the anaerobic tank 3, macromolecular refractory organic matters in the sewage can be converted into micromolecular organic matters easy to degrade by microorganisms, carbon sources in the sewage are consumed, COD of the sewage is reduced, the treated sewage enters the anoxic tank 4 for preliminary sedimentation, the sewage subjected to preliminary sedimentation enters the aerobic tank 5, the micromolecular organic matters easy to degrade by microorganisms are degraded, ammonia nitrogen in the sewage is nitrified, ammonia nitrogen in the sewage is removed, the COD of the sewage is further reduced, the sewage subjected to ammonia nitrogen removal continues to enter the secondary sedimentation tank for secondary sedimentation, and precipitates generated in the sewage are removed by secondary sedimentation; the advanced treatment unit comprises a denitrification deep bed filter 10 and a fiber rotary disc filter 11 which are connected in sequence, and sewage generated after secondary sedimentation enters the denitrification deep bed filter 10 to further remove nitrate nitrogen so that the nitrate nitrogen is converted into nitrogen.

The utility model provides a cities and towns domestic wastewater electrochemistry dephosphorization system still includes electrochemistry dephosphorization unit, and electrochemistry dephosphorization unit connects in parallel between 6 exit ends of second grade sedimentation tank and denitrification deep bed filtering pond 10 entrance points, makes cities and towns domestic sewage can send into the sewage behind the secondary sedimentation earlier in the electrochemistry dephosphorization unit under the condition that phosphorus content does not reach standard and send into denitrification deep bed filtering pond 10 in the dephosphorization again and remove the nitrate nitrogen to make cities and towns domestic sewage can directly enter denitrification deep bed filtering pond 10 in the condition that phosphorus content reaches standard and remove the nitrate nitrogen, make the utility model not only can satisfy and handle the city domestic wastewater that phosphorus content is lower, still can satisfy the city domestic wastewater that phosphorus content exceeds standard and handle; specifically, the electrochemical phosphorus removal unit comprises a phosphorus removal tank 8, the inlet end of the phosphorus removal tank 8 is connected with the outlet end of the secondary sedimentation tank 6, the tank wall of the phosphorus removal tank 8 is made of 4-6mm engineering plastics, the thickness of the tank wall of the phosphorus removal tank 8 can be specifically adjusted according to actual conditions, an electrode plate 804 is further installed in the phosphorus removal tank 8, and when sewage enters the phosphorus removal tank 8, the electrode plate 804 can be in contact with the sewage. Taking the scale of the phosphorus removal tank 8 of 10m3/h as an example, the size of the region for installing the electrode plate 804 in the phosphorus removal tank 8 is a rectangle of 600-1000mm, at this time, the thickness of the electrode plate 804 is 2-4mm, and the length of the electrode plate 804 is 400-800mm, but when the electrode plate 804 is designed, the specific thickness and the specific size of the electrode plate 804 can be adjusted according to the size, the capacity, the nature of sewage and the like of the phosphorus removal tank 8.

The utility model can pre-treat the urban domestic sewage conveyed by the tap water pipe network through the first pre-treatment tank 1 and the second pre-treatment tank 2 in the pre-treatment unit to remove dregs, suspended matters and the like in the urban domestic sewage; the sewage after pretreatment sequentially enters an anaerobic tank 3, an anoxic tank 4, an aerobic tank 5 and a secondary sedimentation tank 6, macromolecular nondegradable organic matters in the sewage are converted into micromolecular organic matters easy to be degraded by microorganisms, carbon sources in the sewage are consumed, COD of the sewage is reduced, ammonia nitrogen in the sewage is removed, micromolecular organic matters easy to be degraded by microorganisms in the sewage are degraded, and finally sedimentation is carried out in the secondary sedimentation tank 6.

When the phosphorus content in the sewage is not over the standard, the precipitated sewage can directly enter the denitrification deep bed filter 10 to remove nitrate nitrogen. When the phosphorus content in the sewage exceeds the standard, the precipitated sewage enters the phosphorus removal tank 8, the electrode plate 804 is electrified, and the electrode plate 804 is taken as an iron material, an oxidation-reduction system is formed in the phosphorus removal tank 8 by using the electrode plate 804, and a large amount of Fe is generated at the anode ²⁺ 、Fe ³⁺ Ion and high molecular hydroxyl polymer Fe using the ion as core _m (H ₂ O)×(OH) _n (3 _m-n ) Compared with the flocculating agents such as common polymeric ferric sulfate and the like, the high molecular polymer has activity and specific surface area which are several times or even tens of times higher; when the iron-containing ionic liquid is fully mixed with the sewage, appropriate oxygenation and aeration are given to promote Fe in the sewage ²⁺ To Fe ³⁺ Changing and changing the pH value of the sewage; at the same time, PO in the phosphorus-containing wastewater ₂ ^3- 、PO ₃ ^3- 、P ₂ O ₇ ^4- The plasma will be oxidized to orthophosphate ion PO in the system ₄ ^3- Above-mentioned Fe ²⁺ 、Fe ³⁺ With PO in water ₄ ^3- React to generate indissolvable Fe ₃ (PO ₄ ) ₂ And FePO ₄ And the high-activity iron-core high-molecular hydroxyl polymer in the system has strong adsorption and coagulationAnd the capturing and bridging capacity can rapidly and thoroughly capture and colloid particles, thereby realizing the thorough phosphorus removal of the wastewater.

In some embodiments, the first pretreatment tank 1 is divided into a plurality of primary treatment regions 100 by a partition plate, and the partition plate is integrated with the first pretreatment tank 1; when the first pretreatment tank 1 is a cement tank, the partition plate can be formed by adopting bricks; when the first pretreatment tank 1 is a metal tank, the partition plate may be formed by welding metal plates. The upper ends of the partition plates are provided with water through holes 103, so that the primary treatment areas 100 can be communicated together through the water through holes 103, the bottoms of the primary treatment areas 100 can be arranged in a ladder way, the bottom structures of the primary treatment areas 100 can be adjusted according to actual conditions, and the tops of the primary treatment areas 100 can be respectively covered by a plurality of fences or jointly covered by one fence; simultaneously, be provided with the thick grid 101 of sewage treatment in the primary treatment region 100 that is located the first-class treatment pond 1 entry end, the thick grid 101 of sewage treatment intercepts the sewage that enters into this primary treatment region 100, the thick grid 101 of sewage treatment is at the interception in-process, the thick grid 101 of sewage treatment of sewage permeable flows to the exit end of first pretreatment pond 1, and float great dregs in the sewage then the interception on the thick grid 101 of sewage treatment, and along with the thick grid 101 operation of sewage treatment with the dregs lift of interception see off first pretreatment pond 1, realize the preliminary treatment to sewage. A lifting pump 20 is arranged in the first-stage treatment area 100 at the outlet end of the first pretreatment tank 1, the outlet end of the lifting pump 20 is connected with the second pretreatment tank 2, so that the lifting pump 20 pumps the sewage pretreated by the sewage treatment coarse grid 101 in the first pretreatment tank 1 into the second pretreatment tank 2, and the sewage enters the second pretreatment tank 2 for secondary pretreatment; in order to control the pumping of the sewage in the first pretreatment tank 1 conveniently, a control valve group 102 can be installed at the outlet end of the lift pump 20, and in order to install the control valve group 102, a primary treatment area 100 for installing the control valve group 102 can be reserved in the first pretreatment tank 1, so that the control valve group 102 does not need to occupy the ground space when being installed; the control valve set 102 is a check valve, which effectively prevents the sewage entering the second pretreatment tank 2 from flowing back.

In some embodiments, the second pretreatment tank 2 has a secondary treatment area 200 and an aerated sand settling area 201 which are arranged in a separated manner, the secondary treatment area 200 and the aerated sand settling area 201 can be separated by a partition plate, the partition plate can be arranged in the same manner as the partition plate in the first pretreatment tank 1, the upper end of the partition plate is also provided with a water through hole 103 for communicating the secondary treatment area 200 with the aerated sand settling area, and the secondary treatment area 200 is positioned at the water inlet end of the second pretreatment tank 2, so that the sewage after the first pretreatment in the first pretreatment tank 1 is directly introduced into the secondary treatment area 200 after being lifted by the lifting pump 20; meanwhile, the upper parts of the secondary treatment area 200 and the aeration sand setting area 201 can be respectively covered by two fences or jointly covered by one fence.

The secondary treatment area 200 is also internally provided with a sewage treatment fine grid 202 and two flashboards 203, the sewage treatment fine grid 202 intercepts sewage entering the secondary treatment area 200, the sewage can flow into the aeration sand settling area 201 through the sewage treatment coarse grid 101 in the intercepting process of the sewage treatment fine grid 202, small particle impurities in the sewage are intercepted on the sewage treatment coarse grid 101, and the intercepted small particle impurities are lifted out of the secondary treatment area 200 along with the operation of the sewage treatment fine grid 202, so that the secondary pretreatment of the sewage is realized; meanwhile, the two flashboards 203 are respectively positioned at the front side and the rear side of the sewage treatment fine grid 202, so that the sewage treatment fine grid 202 is positioned between the two flashboards 203, and the two flashboards 203 are matched, thereby effectively controlling the water inflow of the sewage entering the treatment fine grid and the water inflow of the sewage entering the aeration sand setting area 201, and because small particle impurities flow along with water easily, therefore, when the intercepted small particle impurities of the sewage treatment fine grid 202 are lifted and sent out of the secondary treatment area 200, the area can be intercepted by the matching of the two flashboards 203, the sewage treatment fine grid 202 is prevented from driving the small particle impurities to suspend in the sewage and directly enter the aeration sand setting area 201, and the influence on the treatment of the aeration sand setting area is avoided.

The secondary treatment area 200 is also internally provided with a gate 204 for opening or closing the water through hole 103, the connection or disconnection of the secondary treatment area 200 and the aeration sand settling area 201 is controlled through the gate 204, and the water inlet quantity entering the aeration sand settling area can also be controlled; a first aeration assembly 205 is further arranged in the aeration sand setting area 201, the outlet end of an aeration pipe in the first aeration assembly 205 is positioned at the bottom of the aeration sand setting area 201, and a first air blower 206 for supplying air to the first aeration assembly 205 is further arranged on the second pretreatment tank 2; specifically, the number of the first aeration assemblies 205 in the aerated grit region 201 can be multiple, and the multiple first aeration assemblies 205 are uniformly distributed in the aerated grit region 201, and then the air inlet ends of the multiple first aeration assemblies 205 can be connected in parallel to the outlet end of the first air blower 206; meanwhile, for the installation of the plurality of first aeration assemblies 205, a fixing frame can be further installed in the aeration sand setting area 201, so that the upper ends of the plurality of first aeration assemblies 205 can be installed on the fixing frame, and the installation of the plurality of first aeration assemblies 205 is more stable. Through set up first aeration subassembly 205 in aeration sand setting area 201, make the accessible aeration of particulate matter entering into in the aeration sand setting area produce the friction, make the particulate matter among the sewage diminish to effectively prevent that sewage from causing the damage to elevator pump 20 etc. in subsequent transportation process.

In some embodiments, an overflow area 207 separated from the aerated grit region 201 is further disposed in the second pretreatment tank 2, the aerated grit region 201 and the overflow area 207 are separated in the same manner as the secondary treatment area 200 and the aerated grit region 201, and an overflow port 208 is disposed on a partition for separating the aerated grit region and the overflow area 207, and the overflow port 208 is located at the upper end of the partition; meanwhile, a baffle 209 is further arranged in the aeration sand setting area 201, the left end and the right end of the baffle 209 are fixed to the inner wall of the second pretreatment tank 2, the upper end of the baffle 209 can be flush with the upper surface of the second pretreatment tank 2, a certain distance is formed between the lower end of the baffle 209 and the bottom of the aeration sand setting area 201, sewage can flow through the distance, specifically, when the baffle 209 is designed, the lower end of the baffle 209 is lower than the overflow port 208, so that the sewage between the baffle 209 and the overflow port 208 can be relatively static in the aeration process of the first aeration assembly 205, small particles in the sewage can be precipitated at the bottom of the aeration sand setting area 201, and the precipitated sewage enters the overflow area 207 through the overflow port 208, so that the small particles in the sewage entering the overflow area 207 can be reduced or not exist as much as possible, and conditions are created for subsequent biochemical units. For convenience of control, the overflow area 207 can also be provided with a shutter plate 203, the shutter plate 203 is close to the overflow port 208, when the water level in the overflow area 207 is higher, in order to avoid that the sewage in the aeration sand settling area 201 directly enters the overflow area 207 due to too high water level, so that the sewage entering the biochemical unit cannot meet the treatment requirement of the biochemical unit, at the moment, the shutter plate 203 can intercept the overflow area 207, so that the requirement of the sewage entering the biochemical unit is ensured.

In some embodiments, the agitator 300 is disposed in each of the anaerobic tank 3 and the anoxic tank 4, the agitator 300 is a submersible agitator 300, and the anaerobic tank 3, the anoxic tank 4 and the aerobic tank 5 may be of an integrated structure, specifically, two partition plates are disposed in one large-sized tank, and partition the large-sized tank into the anaerobic tank 3, the anoxic tank 4 and the aerobic tank 5, of course, water through holes 103 are also formed in the two partition plates to ensure communication between the anaerobic tank 3, the anoxic tank 4 and the aerobic tank 5, the anaerobic tank 3 is communicated with an overflow region 207 in the second pretreatment tank 2, the aerobic tank 5 is communicated with the secondary sedimentation tank 6, and the agitator 300 is disposed in the anaerobic tank 3 and the anoxic tank 4, so that flora in the anaerobic tank 3 and the anoxic tank 4 are uniformly distributed by agitation of the agitator 300, and the nitrification efficiency of ammonia nitrogen in the aerobic tank 5 is higher; meanwhile, the anaerobic tank 3 is further provided with a dosing pipe 21, so that a regulator can be conveniently added into the anaerobic tank 3 in the sewage treatment process, specifically, the regulator is a carbon source such as sodium acetate, and the outlet end of the dosing pipe 21 can extend to the bottom of the anaerobic tank 3 and can also be directly positioned above the liquid level in the anaerobic tank 3. The aerobic tank 5 is also internally provided with a second aeration assembly 500, the structure of the second aeration assembly 500 is the same as that of the first aeration assembly 205, the outlet end of an aeration pipe in the second aeration assembly 500 is positioned at the bottom of the aerobic tank 5, and a second blower can be independently arranged for supplying air to the second aeration assembly 500; meanwhile, the number of the second aeration assemblies 500 can be multiple, and the multiple second aeration assemblies 500 are uniformly distributed in the aerobic tank 5, at this time, the air inlet ends of the multiple second aeration assemblies 500 can be connected in parallel at the outlet end of the second blower, of course, the arrangement of the second blower can be omitted here, at this time, the air inlet ends of the multiple second aeration assemblies 500 can be connected in parallel at the outlet end of the first blower 206, and under the condition that the first aeration assembly 205 and the second aeration assembly 500 are used, the equipment cost can be saved.

A mixed liquid return pipeline 17 is connected between the aerobic tank 5 and the anaerobic tank 3, a return pump 19 is further mounted on the mixed liquid return pipeline 17, and a butterfly valve and a check valve can be further arranged on the mixed liquid return pipeline 17, so that sewage in the aerobic tank 5 can flow back to the anoxic tank 4 through the mixed liquid mixed flow pipeline, and untreated sewage flows back to the anoxic tank 4 for circular treatment; a sludge return pipe 22 is connected between the secondary sedimentation tank 6 and the anaerobic tank 3, so that the sludge in the secondary sedimentation tank 6 can be conveyed into the anaerobic tank 3 through the sludge return pipe 22 when needed, and a return pump 19 can be installed on the sludge return pipe 22 for facilitating the conveying of the sludge. In order to facilitate the sewage in the overflow area 207 to enter in an overflow mode when entering the anaerobic tank 3, an overflow weir can be arranged at the inlet of the anaerobic tank 3; similarly, in order to discharge the sewage treated in the aerobic tank 5 in an overflow manner, an overflow weir may be provided at the outlet of the aerobic tank 5.

In some embodiments, the electrochemical phosphorus removal unit further comprises a water drainage tank 9, and the phosphorus removal tank 8 and the water drainage tank 9 may be an integral structure or a separate structure. When the phosphorus removal tank 8 and the water drainage tank 9 are of an integral structure, a box body can be directly adopted, a partition plate is arranged in the box body to divide the interior of the box body into the phosphorus removal tank 8 and the water drainage tank 9 which are arranged left and right, at the moment, the height of the phosphorus removal tank 8 is equal to that of the water drainage tank 9, the bottom of the phosphorus removal tank 8 is flush with the bottom of the water drainage tank 9, the width of the phosphorus removal tank 8 is 200-400mm, and the upper end of the partition plate can be lower than the upper end of the shell or the upper end of the partition plate is provided with a water through hole 103, so that the upper end of the phosphorus removal tank 8 is communicated with the upper end of the water drainage tank 9; when the phosphorus removal tank 8 and the drainage tank 9 are of a split structure, the upper end of the phosphorus removal tank 8 and the upper end of the drainage tank 9 can be communicated with a water passing pipe or a water passing tank, and the treated water in the phosphorus removal tank 8 can overflow into the drainage tank 9 under the condition. The utility model discloses in, integrative structure is preferentially adopted with water drainage tank 9 to dephosphorization groove 8.

The dephosphorization tank 8 is internally provided with a support frame 803, a plurality of electrode plates 804 are arranged in the dephosphorization tank 8, a certain interval is arranged among the plurality of electrode plates 804, and the plurality of electrode plates 804 are jointly arranged on the support frame 803, so that the plurality of electrode plates 804 are jointly supported in the dephosphorization tank 8 through the support frame 803, and when sewage enters the dephosphorization tank 8, the plurality of electrode plates 804 can be in contact with the sewage.

In some embodiments, a sludge discharge pipe 801 and a water inlet pipe 800 are further arranged on the phosphorus removal tank 8, the sludge discharge pipe 801 is used for discharging colloidal particles and precipitated sludge generated after phosphorus removal in the phosphorus removal tank 8 out of the phosphorus removal tank 8, specifically, the outlet end of the secondary sedimentation tank is also connected in parallel with an intermediate water tank 7, the intermediate water tank 7 can be used for temporarily storing sewage to be phosphorus removed or sewage to be ammonium-removed through the denitrification deep bed filter 10 through the intermediate water tank 7, the inlet end of the water inlet pipe 800 is connected in parallel with the outlet end of the intermediate water tank 7, and a lift pump 20 is further installed in the intermediate water tank 7, so that when the water level of the intermediate water tank 7 is low, the sewage can be lifted by the lift pump 20 to meet the use requirements of the phosphorus removal tank 8 and the denitrification deep bed filter 10, and the outlet end of the intermediate water tank 7 is simultaneously connected in parallel with the inlet end of the denitrification deep bed filter 10; meanwhile, the water discharging pipe 900 is further arranged on the water discharging groove 9, the water discharging pipe 900 is used for directly discharging water overflowing into the water discharging groove 9 after the dephosphorization treatment to the outside of the water discharging groove 9, and the water discharging pipe 900 is connected with the aerobic tank 5, so that the sewage after the dephosphorization can enter the aerobic tank 5 for nitration, and ammonia nitrogen in the sewage is further removed. Through the synergistic effect of the sludge discharge pipe 801, the water inlet pipe 800 and the water outlet pipe 900, the sewage entering, the sewage discharging after dephosphorization and the colloid particle discharging generated by dephosphorization do not need artificial participation, so that the dephosphorization of the sewage is more convenient.

In some embodiments, the height of the water outlet pipe 900 is equal to the height of the lower end of the electrode plate 804, so as to facilitate the drainage of the sewage in the drainage tank 9.

In some embodiments, the water inlet pipe 800 and the sludge discharge pipe 801 are both located at the bottom of the phosphorus removal tank 8, and the outlet end of the water inlet pipe 800 is connected in parallel to the inlet end of the sludge discharge pipe 801 through a three-way joint, so that the outlet end of the water inlet pipe 800 and the inlet end of the sludge discharge pipe 801 jointly form a three-way pipe, and a pipeline system on the phosphorus removal tank 8 is simpler; meanwhile, the water inlet pipe 800 is positioned at the bottom of the dephosphorization tank 8, so that the sewage can not directly contact the electrode plate 804 when entering the dephosphorization tank 8, and the sediment in the sewage can not be attached to the electrode plate 804 as much as possible, thereby ensuring the electrolysis effect.

In some embodiments, the bottom of the drainage tank 9 is further provided with an emptying pipe 901, so that the sewage overflowing into the drainage tank 9 can be further precipitated in the drainage tank 9, after precipitation, the upper layer sewage in the drainage tank 9 can be directly discharged through the water outlet pipe 900, and precipitates generated by precipitation can be directly discharged through the emptying pipe 901, so that the sewage after entering the dephosphorization treatment can be precipitated in the drainage tank 9.

In some embodiments, electromagnetic valves are disposed on the sludge discharge pipe 801, the water inlet pipe 800, the water outlet pipe 900 and the air release pipe 901, and in order to prevent sediment or colloidal particles generated in the phosphorus removal process during sludge discharge of the sludge discharge pipe 801 from entering the water inlet pipe 800, the electromagnetic valve on the water inlet pipe 800 is preferably installed at the outlet end of the water inlet pipe 800. Specifically, the utility model discloses can also set PLC automatic control cabinet 902 and switch board 903, switch board 903 is to PLC automatic control cabinet 902 respectively, plate electrode 804 and solenoid valve power supply, PLC automatic control cabinet 902 not only controls mud pipe 801, inlet tube 800, the switch of solenoid valve on outlet pipe 900 and the blow-down pipe 901 and open the size, PLC automatic control cabinet 902 still controls plate electrode 804 and is electrified or cut off the power supply, make the sewage dephosphorization in-process realize automatic control, thereby make the sewage dephosphorization in-process not need artifical the participation, it is more simple and convenient to make the sewage dephosphorization. Meanwhile, the electromagnetic valve is arranged on the water inlet pipe 800, so that the amount of sewage entering the dephosphorization tank 8 is effectively controlled, the voltage of the electrode plate 804 can be controlled according to the amount of sewage entering the dephosphorization tank 8 in the dephosphorization process, and efficient dephosphorization is realized.

In some embodiments, the number of the electrochemical phosphorus removal units is multiple, and the multiple electrochemical phosphorus removal units are arranged in a rectangular array, for example, the number of the electrochemical phosphorus removal units is 8, and the 8 electrochemical phosphorus removal units are arranged in a 2 × 4 manner. In order to reduce the occupied area of the utility model, a plurality of electrochemical phosphorus removal units can be arranged without a space between two adjacent electrochemical phosphorus removal units; meanwhile, when the number of the electrochemical phosphorus removal units is multiple, the multiple electrochemical phosphorus removal units are connected in parallel or connected in series in sequence. When a plurality of phosphorus removal units are connected in parallel, the outlet ends of sludge discharge pipes 801 on the plurality of phosphorus removal units are connected in parallel, the inlet ends of water inlet pipes 800 on the plurality of electrochemical phosphorus removal units are connected in parallel, the outlet ends of water outlet pipes 900 on the plurality of electrochemical phosphorus removal units are connected in parallel, and the outlet ends of emptying pipes 901 on the plurality of electrochemical phosphorus removal units are connected in parallel, so that the plurality of electrochemical phosphorus removal units can supplement sewage without phosphorus removal or discharge precipitate together or discharge sewage after phosphorus removal together, and the design ensures that the whole pipeline system is simpler; when a plurality of phosphorus removal units are sequentially connected in series, the outlet end of a water outlet pipe 900 on the former phosphorus removal unit is connected with the inlet end of a water inlet pipe 800 on the latter phosphorus removal unit, the outlet ends of sludge discharge pipes 801 of the plurality of phosphorus removal units are connected in parallel, and the outlet ends of vent pipes 901 on the plurality of phosphorus removal units are connected in parallel.

In some embodiments, the bottoms of the phosphorus removal tank 8 and the drainage tank 9 are funnel-shaped, so that the precipitate generated in the phosphorus removal process and the precipitate generated in the drainage tank 9 after phosphorus removal can be automatically collected by gravity and then intensively discharged, and the precipitates in the phosphorus removal tank 8 and the drainage tank 9 are more thoroughly discharged; meanwhile, the electrode plate 804 is positioned in the middle of the phosphorus removal tank 8, and the precipitate generated in the phosphorus removal process of the sewage can fall to the bottom of the phosphorus removal tank 8 through self weight, so that the precipitate generated in the phosphorus removal process is always separated from the electrode plate 804, the influence of the precipitate generated in the phosphorus removal process on the amount of the electric ions generated by the electrode plate 804 is avoided, and the phosphorus removal effect is effectively ensured.

In some embodiments, the plurality of electrode plates 804 are arranged alternately in the positive and negative poles, and in order to prevent the electrode plates 804 from hardening and passivating, the electrode plates 804 may further be powered by a pulse power supply, and the positive and negative poles of the electrode plates 804 may be switched according to a set frequency, so that the electrode plates 804 can generate sufficient ions when being charged, and the amount of the ions generated by the electrode plates 804 is ensured.

In some embodiments, the electrode plate 804 is a carbon steel plate, an iron plate, or an aluminum plate, and the specific material of the electrode plate 804 can be adjusted according to actual requirements.

In some embodiments, the supporting frame 803 and the wall of the phosphorus removal tank 8, and the electrode plate 804 and the supporting frame 803 are all connected by a clamping groove, specifically, the groove structures can be prefabricated in the production and processing processes of the phosphorus removal tank 8 and the supporting frame 803, so that the subsequent independent installation of the groove structures on the walls of the supporting frame 803 and the phosphorus removal tank 8 is not required, the supporting frame 803 can be clamped by the clamping groove on the wall of the phosphorus removal tank 8 during installation, and the electrode plate 804 can be clamped by the clamping groove on the supporting frame 803 during installation, so that the installation and the disassembly of the electrode plate 804 are more convenient.

In some embodiments, the distance between two adjacent electrode plates 804 is 1-12cm, and the specific size of the distance between two adjacent electrode plates 804 can be adjusted by calculation according to the thickness of the electrode plates 804, the concentration of the wastewater, the flow rate of the wastewater, and the like.

In some embodiments, the steel ladder and the steel guardrail can be arranged on the same side of the plurality of electrochemical phosphorus removal units, so that workers can conveniently patrol and overhaul at any time in the sewage phosphorus removal treatment process.

In some embodiments, the utility model provides a town domestic wastewater electrochemistry dephosphorization system still includes the sludge treatment unit, the sludge treatment unit is including sludge concentration tank 13 and the sludge dewatering computer lab that connects gradually, it is specific, oxygen deficiency pond 4, second grade sedimentation tank 6, blow-down pipe 901 and row's mud pipe 801 in the electrochemistry dephosphorization unit all are connected with sludge concentration tank 13, and oxygen deficiency pond 4, second grade sedimentation tank 6, blow-down pipe 901 and row's mud pipe 801 in the electrochemistry dephosphorization unit and the connection that sludge concentration tank 13 between can adopt mud conveyer pipe 18, make the precipitate that produces in this system, mud etc. homoenergetic send into sludge concentration tank 13 in concentrate the processing, and directly send into sludge dewatering processing in the sludge dewatering through the concentrated processing back, the final mud that obtains after the dewatering processing computer lab. In order to ensure the sludge discharge effect in the anoxic tank 4, the secondary sedimentation tank 6 and the electrochemical phosphorus removal unit, a reflux pump 19 can be installed on the sludge conveying pipe 18, so that the equipment cost is saved, the sludge conveying pipes 18 for conveying the anoxic tank 4, the secondary sedimentation tank 6, the blow-down pipe 901 and the sludge discharge pipe 801 in the electrochemical phosphorus removal unit can be connected with the sludge concentration tank 13 after being connected in parallel, at the moment, an electromagnetic valve can be installed on each sludge conveying pipe 18, and the reflux pump 19 is installed at the inlet end of the sludge concentration tank 13.

In some embodiments, a material tank 14, a sludge modification bin 15 and a filter press 16 which are connected in sequence are further installed in the sludge dewatering machine room, an outlet end of the sludge concentration tank 13 is connected with an inlet end of the sludge modification bin 15, the material tank 14 is used for storing a modifying agent, the modifying agent in the material tank 14 can be added into the sludge modification bin 15 as required, so that the sludge fed into the sludge modification bin 15 through the sludge concentration tank 13 is modified after reacting with the modifying agent, and is fed into the filter press 16 after being modified for filter pressing treatment, so that the dewatered sludge is obtained, and the sludge after filter pressing and dewatering through the filter press 16 can be loaded and transported through an elevator.

In some embodiments, the utility model provides a town domestic wastewater electrochemical phosphorus removal system is fibre carousel filtering pond 11 and ultraviolet disinfection canal still, spacing carousel filtering pond and ultraviolet disinfection canal 12 connect gradually at the play water end in denitrification deep bed filtering pond 10, still be provided with on the denitrification deep bed filtering pond 10 to be used for complementing the pencil 21 of dosing of carbon source (sodium acetate) and be used for complementing the pencil 21 of dosing of PAC flocculating agent, and can set aeration components in the denitrification deep bed filtering pond 10 still, an air-blower for to this aeration components air feed can set up alone also can directly connect in parallel this aeration components's entrance point on first air-blower 206 or on the second air-blower. Through setting up fibre carousel filtering pond 11 and ultraviolet disinfection canal, make the sewage after the further denitrogenation of deep bed filtering pond 10 through the denitrification pass through fibre carousel filtering pond 11 and get rid of SS after again through the ultraviolet disinfection canal carry out discharge to reach standard after the ultraviolet disinfection, make and pass through the utility model provides a sewage after the dephosphorization system handles can directly discharge. It is noted that the fiber rotary disc filter 11 can be replaced by artificial wetland.

When the utility model is used for town domestic sewage treatment, concrete processing step as follows:

a pretreatment unit: urban domestic sewage is conveyed by a tap water pipe network and is firstly sent into a first pretreatment tank 1, the urban domestic sewage is intercepted by a sewage treatment coarse grid 101 after entering the first pretreatment tank 1, large floating dregs in the sewage are intercepted by the sewage treatment coarse grid 101, the sewage normally flows, dregs intercepted on the sewage treatment coarse grid 101 are lifted by the sewage treatment coarse grid 101 and are directly discharged out of the first pretreatment tank 1, the sewage in the first pretreatment tank 1 is finally sent into a secondary treatment area 200 by a lifting pump 20 along with the flowing of the sewage in the first pretreatment tank 1, the sewage entering the secondary treatment area 200 passes through a sewage treatment fine grid 202 along with the flowing, and small particle impurities in the sewage are intercepted on the sewage treatment fine grid 202 in the flowing process, the small particle impurities intercepted on the sewage treatment fine grid 202 are lifted by the sewage treatment fine grid 202 and directly discharged out of the secondary treatment area 200, the gate 204 at the water passing hole 103 is opened, the sewage enters the aeration sand settling area 201 along with the normal flow of the sewage, the first air blower 206 is started, the first aeration component 205 starts aeration, the sewage is boiled in the aeration sand settling area 201, the friction of the residual particles in the sewage is reduced along with the boiling of the sewage, the fine particles precipitated in the aeration process are directly discharged and sent into the sand-water separator for separation and then discharged, the sewage after aeration overflows through the overflow port 208 and enters the overflow area 207, and the sewage entering the overflow area 207 is sent into the anaerobic tank 3.

A biochemical treatment unit: sewage sent out through the overflow area 207 enters the anaerobic tank 3 and enters the anaerobic tank 3 in an overflow mode through an overflow weir, carbon sources such as sodium acetate are added into the anaerobic tank 3 while the sewage enters the anaerobic tank 3, a stirrer 300 in the anaerobic tank 3 is stirred simultaneously, sodium acetate converts difficultly degraded molecular organic matters in the sewage into easily biodegradable small molecular organic matters after dissolution, the carbon sources in the sewage are consumed simultaneously, COD (chemical oxygen demand) of the sewage is reduced, the sewage after uniform dissolution of the sodium acetate automatically flows into the anoxic tank 4, the stirrer 300 in the anoxic tank 4 is stirred, during stirring, floras in the sewage are distributed uniformly in the anoxic tank 4 and ammonia nitrogen and degraded organic matters in the sewage are removed, then, supernatant liquid in the anoxic tank 4 automatically flows into the aerobic tank 5, the second air blower runs at the moment, provides an air source for the second aeration assembly 500, the sewage entering the aerobic tank 5 is boiled to degrade the sewage in the aerobic tank 5, the ammonia nitrogen and nitrogen containing organic matters are nitrified, finally, the sewage in the aerobic tank 5 enters an aerobic tank 6, and the sewage automatically flows into a secondary sedimentation tank 8 after the nitrification and enters a secondary sedimentation tank 8 directly after the denitrification sedimentation of the sewage.

In the treatment unit, when the degradation of organic matters in the sewage through aeration in the aerobic tank 5 is not thorough enough, the sewage in the aerobic tank 5 can be directly sent into the anoxic tank 4 through the mixed liquid return pipeline 17 to be repeatedly operated, and the sewage in the aerobic tank 5 can be pumped through the return pump 19 on the mixed liquid mixed flow pipeline when being sent through the mixed liquid return pipeline 17.

An electrochemical phosphorus removal unit: when the phosphorus content of the sewage after secondary precipitation exceeds the standard and the sewage needs to enter the phosphorus removal tank 8 through the water inlet pipe 800, the electromagnetic valves on the water inlet pipe 800 and the water outlet pipe 900 are opened, the sewage to be subjected to phosphorus removal enters the inlet end of the sludge discharge pipe 801 through the water inlet pipe 800 and finally enters the phosphorus removal tank 8, the electrode plate 804 is electrified, and a large amount of Fe is generated by the anode of the electrode plate 804 ²⁺ 、Fe ³⁺ Ion and high molecular hydroxyl polymer Fe using the ion as core _m (H ₂ O)×(OH) _n (3 _m-n ) Compared with the flocculating agents such as common polymeric ferric sulfate and the like, the high molecular polymer has activity and specific surface area which are several times or even tens of times higher. When the iron-containing ionic liquid is fully mixed with the sewage, appropriate oxygenation and aeration are given to promote Fe in the sewage ²⁺ To Fe ³⁺ And changing the pH value of the sewage. At the same time, PO in the phosphorus-containing wastewater ₂ ^3- 、PO ₃ ^3- 、P ₂ O ₇ ^4- The plasma willOxidized to orthophosphate ion PO in the system ₄ ^3- Above-mentioned Fe ²⁺ 、Fe ³⁺ With PO in water ₄ ^3- React to generate indissolvable Fe ₃ (PO ₄ ) ₂ And FePO ₄ And the high-activity iron core high-molecular hydroxyl polymer in the system has strong adsorption, coagulation, capture and bridging capabilities, rapidly and thoroughly captures colloidal particles, and the colloidal particles are deposited at the bottom of the phosphorus removal tank 8 through self weight.

In the dephosphorization process in the dephosphorization tank 8, the water inlet pipe 800 continuously replenishes sewage in the dephosphorization tank 8, so that the water level in the dephosphorization tank 8 gradually rises, when the water level in the dephosphorization tank 8 reaches the water through holes 103, the sewage after dephosphorization in the dephosphorization tank 8 overflows into the drainage tank 9 through the water through holes 103, the sewage entering into the drainage tank 9 automatically precipitates, the precipitated precipitate is accumulated at the bottom of the drainage tank 9, and along with the rise of the water level in the drainage tank 9, the sewage after precipitation in the drainage tank 9 overflows through the water outlet pipe 900 and is discharged into the aerobic tank 5, and the steps in the biochemical treatment unit are repeated.

When the sediment in the drainage tank 9 and the dephosphorization tank 8 is deposited more, the electromagnetic valve on the water outlet pipe 900 is closed, the electrode plate 804 is powered off, the electromagnetic valves on the sludge discharge pipe 801 and the emptying pipe 901 are opened, the sediment in the drainage tank 9 is discharged through the emptying pipe 901, and the sediment in the dephosphorization tank 8 is discharged through the sludge discharge pipe 801.

A depth processing unit: when the phosphorus content of the sewage does not exceed the standard, the sewage in the intermediate water tank 7 is directly sent into the denitrification deep bed filter 10, a carbon source (sodium acetate) is added into the denitrification deep bed filter 10, a PAC flocculating agent can be added if necessary, nitrate nitrogen is further removed through the denitrification deep bed filter 10 and converted into nitrogen, and the finally treated sewage enters the fiber rotary disc filter 11 to remove SS and is disinfected through an ultraviolet disinfection channel and then is discharged after reaching the standard.

A sludge treatment unit: the sediments in the anaerobic tank 3, the secondary sedimentation tank 6, the dephosphorization tank 8 and the drainage tank 99 can be conveyed into the sludge concentration tank 13 through a reflux pump 19 on a sludge conveying pipe 18, specifically, electromagnetic valves on a sludge pipe 801 and an emptying pipe 901 are opened, so that the sediments in the dephosphorization tank 8 and the sediments in the drainage tank 99 can be conveyed into the sludge concentration tank 13 through the sludge conveying pipe 18, the sediments in the anaerobic tank 3, the secondary sedimentation tank 6, the dephosphorization tank 8 and the drainage tank 99 enter the sludge concentration tank 13 and then are conveyed into the sludge modification bin 15, meanwhile, the modifier in the material tank 14 is conveyed into the sludge modification bin 15, so that the sludge entering the sludge modification bin 15 is fully reacted with the modifier, after the sludge is reacted in the sludge modification bin 15, the sludge in the sludge modification bin 15 is conveyed into a filter press 16, and is directly discharged after being dehydrated through the filter press 16.

In the present invention, when calculating the amount of generated ions from the electrode plate 804, the current density is J, which is a physical quantity describing the current intensity and the flowing direction at a certain point in the circuit, and the magnitude of the physical quantity is equal to the electric quantity passing through a certain unit area in a unit time, generally in terms of a/m ² And (4) showing. The area of the electrode plate 804 is a constant value S, the current is I, the energization time T, the electric quantity is Q, the number of electrons n, the single electron electric quantity Q, the resistance of the electrode plate 8049 is R, and k is a constant.

n = Q/Q, Q = I × T, I = V/R, J = I/S, and then the electron generation amount n = k × J × S × T/Q, since the area and the resistance of the electrode plate 804 are fixed values, and the single electron electric quantity is fixed value, in the case of a fixed energization time, the voltage is changed, and thus the current density is changed, and therefore the current density is in a direct proportion relation with the electron generation amount.

And simultaneously, the utility model discloses in still can control the Fe ion production volume through power control current density, ion production volume and PO ₄ ^3- The reaction is carried out to remove phosphorus, so that the current density can be adjusted through the change of the concentration of the total phosphorus, and the total phosphorus can be accurately removed.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples and features of the various embodiments/modes or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are provided for clarity of description only, and are not intended to limit the scope of the invention. Other variations or modifications will occur to those skilled in the art based on the foregoing disclosure and are still within the scope of the invention.

Claims (19)

1. An electrochemical dephosphorization system for urban domestic wastewater is characterized by comprising a pretreatment unit, a biochemical treatment unit and an advanced treatment unit which are sequentially connected;

the pretreatment unit comprises a first pretreatment tank (1) and a second pretreatment tank (2) which are connected in sequence;

the biochemical treatment unit comprises an anaerobic tank (3), an anoxic tank (4), an aerobic tank (5) and a secondary sedimentation tank (6) which are connected in sequence;

the deep treatment unit comprises a denitrification deep bed filter (10);

the device also comprises an electrochemical phosphorus removal unit, wherein the electrochemical phosphorus removal unit is connected between the outlet end of the secondary sedimentation tank (6) and the denitrification deep-bed filter (10) in parallel, the electrochemical phosphorus removal unit comprises a phosphorus removal tank (8), and an electrode plate (804) is further arranged in the phosphorus removal tank (8).

2. The electrochemical dephosphorization system for urban domestic wastewater according to claim 1, wherein the first pretreatment tank (1) is divided into a plurality of primary treatment areas (100) by partition plates, and a sewage treatment coarse grid (101) is arranged in the primary treatment area (100) at the inlet end of the first pretreatment tank (1).

3. The electrochemical dephosphorization system for urban domestic wastewater according to claim 1, wherein the second pretreatment tank (2) is provided therein with a secondary treatment area (200) and an aerated grit region (201) which are arranged at intervals, the secondary treatment area (200) is provided therein with a fine sewage treatment grid (202) and two shutters (203), the two shutters (203) are respectively positioned at the front and rear sides of the fine sewage treatment grid (202), the second pretreatment tank (2) is further provided thereon with water through holes (103) for communicating the secondary treatment area (200) and the aerated grit region (201), and the secondary treatment area (200) is further provided with gates (204) for opening or closing the water through holes (103); a first aeration assembly (205) is further arranged in the aeration sand setting area (201), and a first air blower (206) for supplying air to the first aeration assembly (205) is further arranged on the second pretreatment tank (2).

4. The urban domestic wastewater electrochemical phosphorus removal system according to claim 3, wherein an overflow area (207) separated from the aerated grit region (201) is further arranged in the second pretreatment tank (2), the second pretreatment tank (2) is further provided with a baffle (209) communicating the aerated grit region (201) with the overflow area (207), the aerated grit region (201) is further provided with a baffle (209), the baffle (209) is close to the inlet end of the overflow port (208), and the lower end of the baffle (209) is lower than the height of the overflow port (208).

5. The electrochemical urban domestic wastewater dephosphorization system according to claim 1, wherein a stirrer (300) is arranged in each of the anaerobic tank (3) and the anoxic tank (4), the anaerobic tank (3) is further provided with a dosing pipe (21), the aerobic tank (5) is further provided with a second aeration assembly (500), a mixed liquor return pipe (17) is connected between the aerobic tank (5) and the anaerobic tank (3), and a sludge return pipe (22) is connected between the secondary sedimentation tank (6) and the anaerobic tank (3).

6. The electrochemical dephosphorization system for urban domestic wastewater according to claim 1, wherein the electrochemical dephosphorization unit further comprises a drainage tank (9), the upper end of the dephosphorization tank (8) is communicated with the upper end of the drainage tank (9), a plurality of electrode plates (804) are arranged in the dephosphorization tank (8) at intervals on the support frame (803), and a support frame (803) is further arranged in the dephosphorization tank (8).

7. The electrochemical dephosphorization system for urban domestic wastewater according to claim 1, wherein a sludge discharge pipe (801) for discharging sludge and a water inlet pipe (800) for feeding water are further arranged on the dephosphorization tank (8), a water outlet pipe (900) is further arranged on the drainage tank (9), and the water outlet pipe (900) is connected with the aerobic tank (5).

8. The electrochemical dephosphorization system for urban domestic wastewater according to claim 7, wherein the water inlet pipe (800) and the sludge discharge pipe (801) are both located at the bottom of the dephosphorization tank (8), and the outlet end of the water inlet pipe (800) is communicated with the inlet end of the sludge discharge pipe (801) through a three-head joint.

9. The electrochemical dephosphorization system for urban domestic wastewater according to claim 8, wherein the water outlet pipe (900) is positioned in the middle of the drainage tank (9), and a blow-down pipe (901) is further arranged at the bottom of the drainage tank (9).

10. The electrochemical dephosphorization system for urban domestic wastewater according to claim 9, wherein electromagnetic valves are arranged on the sludge discharge pipe (801), the water inlet pipe (800), the water outlet pipe (900) and the blow-down pipe (901).

11. The electrochemical dephosphorization system for urban domestic wastewater according to claim 6, wherein the number of the electrochemical dephosphorization units is multiple, the multiple electrochemical dephosphorization units are arranged in a rectangular array, and the multiple electrochemical dephosphorization units are connected in parallel or in series in sequence.

12. The electrochemical dephosphorization system for urban domestic wastewater according to claim 6, wherein the bottom of each of the dephosphorization tank (8) and the drainage tank (9) is funnel-shaped, and the electrode plate (804) is located in the middle of the dephosphorization tank (8).

13. The electrochemical dephosphorization system for urban domestic wastewater according to claim 6, wherein a plurality of said electrode plates (804) are arranged in an alternating manner with positive and negative electrodes.

14. The electrochemical dephosphorization system for urban domestic wastewater according to claim 6, wherein the electrode plate (804) is a carbon steel plate or an iron plate or an aluminum plate.

15. The electrochemical dephosphorization system for urban domestic wastewater according to claim 6, wherein the support frame (803) and the wall of the dephosphorization tank (8), and the electrode plate (804) and the support frame (803) are all connected by a clamping groove.

16. The electrochemical dephosphorization system for urban domestic wastewater according to claim 6, wherein the distance between two adjacent electrode plates (804) is 1-12cm.

17. The urban domestic wastewater electrochemical dephosphorization system according to claim 1, further comprising an intermediate water tank (7), wherein the intermediate water tank (7) is located between the secondary sedimentation tank (6) and the dephosphorization tank (8), and the outlet end of the intermediate water tank (7) is provided with a parallel pipeline connected in parallel with the inlet end of the denitrification deep-bed filter (10).

18. The electrochemical dephosphorization system for urban domestic wastewater according to any one of claims 1 to 17, further comprising a sludge treatment unit, wherein the sludge treatment unit comprises a sludge concentration tank (13) and a sludge dewatering machine room which are connected in sequence, and a sludge conveying pipe (18) is connected between the anaerobic tank (3), the secondary sedimentation tank (6) and the sludge concentration tank (13).

19. The electrochemical dephosphorization system for urban domestic wastewater according to claim 18, wherein a material tank (14), a sludge modification bin (15) and a filter press (16) are sequentially installed in the sludge dewatering machine room, and an outlet end of the sludge concentration tank (13) is connected with an inlet end of the sludge modification bin (15).

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