Wastewater treatment system and method using three-dimensional electrode system coupled with anion exchange membrane

Abstract

The invention discloses a wastewater treatment system and method of a three-dimensional electrode system coupled with an anion exchange membrane, comprising a pretreatment mechanism, a three-dimensional electrolytic ion exchange mechanism connected to the pretreatment mechanism, and an MBBR electrolysis mechanism connected to the three-dimensional electrolytic ion exchange mechanism; the pretreatment mechanism comprises a grid filter tank, and a pretreatment regulating tank is provided in the grid filter tank; the invention couples the three-dimensional electrolytic ion exchange mechanism and the MBBR electrolysis mechanism, under the action of the three-dimensional electrode system, the specific surface area of ​​the microorganism in contact with the electrode is increased, the biological metabolism of the electrically activated denitrifying bacteria is promoted by microcurrent, and the nitrate nitrogen in the reflow wastewater is used to promote denitrification; at the same time, the reflow wastewater is rich in nitrate nitrogen, and the nitrate nitrogen enters the anode biological chamber through the anion exchange membrane in the cathode biological chamber, and is reduced to nitrogen gas in the anode biological chamber, so that the denitrification process is strengthened under the synergistic action of microbiology and electrochemistry.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater purification and treatment, in particular to a wastewater treatment system and method of a three-dimensional electrode system coupled with an anion exchange membrane. Background Art

[0002] MBBR (Moving Bed Biofilm Reactor) is a common wastewater treatment process. By adding a certain amount of suspended carriers into the reactor, the biomass and biological species in the reactor are increased, thereby improving the reactor's treatment efficiency. The density of the suspended filler is close to that of water, and is similar to that of the water body before and after biofilm formation, so that it can be suspended in water. Its essence is that the biofilm runs in the manner of activated sludge with the carrier and is in a suspended state, which not only ensures the enrichment of microorganisms, but also prevents problems such as non-selectivity for microorganisms.

[0003] However, as a single wastewater treatment process, it is difficult for the MBBR process to achieve wastewater standards, especially total nitrogen. In addition, the MBBR process often has a high level of suspended particulate matter in the effluent, requiring a separate sedimentation tank for treatment. The MBBR process has poor resistance to shock loads. When encountering a strong influent load, some biofilms are prone to fall off, affecting the effluent quality, and further strengthening is urgently needed. Summary of the invention

[0004] The purpose of the present invention is to provide a wastewater treatment system and method of a three-dimensional electrode system coupled with an anion exchange membrane, which can synergistically enhance the denitrification process and promote denitrification efficiency and organic matter removal rate.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A wastewater treatment system of a three-dimensional electrode system coupled with an anion exchange membrane, comprising a pretreatment mechanism, a three-dimensional electrolytic ion exchange mechanism connected to the pretreatment mechanism, and an MBBR electrolytic mechanism connected to the three-dimensional electrolytic ion exchange mechanism;

[0007] The pretreatment mechanism includes a grid-type filter tank, and the grid-type filter tank is connected to a pretreatment regulating tank;

[0008] The three-dimensional electrolytic ion exchange mechanism comprises a biofilter shell with an opening facing upward, a horizontally arranged lower partition support plate is fixed in the biofilter shell, a biofilter inner shell with an opening facing upward is fixed on the top of the lower partition support plate, and a horizontally arranged upper partition support plate is fixed in the biofilter shell above the lower partition support plate;

[0009] A blank separation ring is fixed between the bottom of the biofilter shell and the lower end of the separation lower support plate;

[0010] An initial input space is formed between the lower partition support plate and the inner bottom of the biofilter shell and the outer side wall of the blank partition ring, and a supporting layer accommodating space is formed between the lower partition support plate and the upper partition support plate;

[0011] A three-dimensional electrolysis space is formed between the upper support plate and the inner wall of the biofilter shell and the outer wall of the biofilter inner shell;

[0012] The three-dimensional electrolysis space is filled with a plurality of three-dimensional electrode units, the three-dimensional electrode units include a three-dimensional electrode containing shell, and the three-dimensional electrode containing shell is filled with a three-dimensional electrode composite filler;

[0013] The three-dimensional electrode composite filler is composed of activated carbon particles and ceramsite in a volume ratio of 1:8-10;

[0014] A ring-shaped exchange membrane fixing ring shell with a vertically extending axis is fixed on the top of the partition upper support plate, and a plurality of anion exchange membranes are fixed on the side wall of the exchange membrane fixing ring shell;

[0015] The exchange membrane fixed ring shell divides the three-dimensional electrolysis space into an anode biological chamber and a cathode biological chamber. A plurality of three-dimensional electrode anode plates are arranged in the anode biological chamber, and a plurality of three-dimensional electrode cathode plates are arranged in the cathode biological chamber.

[0016] The three-dimensional electrode anode plate and the three-dimensional electrode cathode plate are electrically connected to the positive electrode and the negative electrode of the three-dimensional electrolysis power supply respectively;

[0017] The MBBR electrolysis mechanism includes an aeration mechanism arranged inside the inner shell of the biofilter and a fluidized filler filled inside the inner shell of the biofilter;

[0018] The fluidized filler is SPR-1 type filler or magnetic fluid filler;

[0019] A vertically extending electrode support column is fixed in the inner shell of the biofilter tank, a plurality of microbial electrolysis anode plates are fixed on the inner side wall of the inner shell of the biofilter tank, and a plurality of microbial electrolysis cathode plates are fixed on the electrode support column;

[0020] The microbial electrolysis anode plate and the microbial electrolysis cathode plate are electrically connected to the positive electrode and the negative electrode of the MBBR power supply, respectively;

[0021] A plurality of electrolysis mechanism input pipes connected to the inside of the biofilter tank are fixed on the outside of the biofilter tank inner shell, and the electrolysis mechanism input pipes are arranged along the radial extension of the biofilter tank inner shell, and a plurality of vertically extending dispersed transport communication pipes connected to the electrolysis mechanism input pipes are fixed on the lower side of the electrolysis mechanism input pipes;

[0022] A water outlet collecting ring shell is fixed on the outside of the electrode support column, a plurality of water outlet connecting branch pipes connected with the inside of the water outlet collecting ring shell are fixed on the lower side, and a water outlet external discharge pipe connected with the inside of the water outlet collecting ring shell is fixed on the upper side.

[0023] Preferably, the pretreatment regulating tank is connected to the initial input space through a decentralized water inlet mechanism, and the decentralized water inlet mechanism includes a plurality of decentralized water inlet connecting shells fixed to the bottom of the biological filter tank shell, and the bottom of the biological filter tank shell has a plurality of decentralized water inlet through holes to connect the initial input space with the inside of the decentralized water inlet connecting shell;

[0024] A dispersed water inlet input pipe connected to the inside of the dispersed water inlet connecting shell is fixed on the outside thereof, and the other end of the dispersed water inlet input pipe is connected to the pretreatment regulating tank.

[0025] Description: The wastewater to be treated is transported more evenly into the biofilter shell through a decentralized water inlet mechanism.

[0026] Preferably, a plurality of supporting layer units are arranged in the supporting layer accommodating space, and the supporting layer unit comprises a supporting layer unit shell which is vertically penetrated and is a regular hexagonal prism, a plurality of vertically penetrated supporting layer split shells are fixed in the supporting layer unit shell, and the supporting layer split shells are filled with supporting layer fillers;

[0027] An end closing plate is fixed in each of the upper and lower ends of the split shell of the supporting layer, and a plurality of vertically penetrating supporting layer flow holes are arranged on the end closing plate.

[0028] Description: The supporting layer unit can not only play a good supporting role, but also facilitate the attachment and reproduction of microorganisms, thereby strengthening the microbial treatment process of wastewater.

[0029] Preferably, the anion exchange membrane has an exchange membrane reinforcement structure, which includes a reinforcement structure semipermeable membrane arranged in parallel and fixed on both sides of the anion exchange membrane, and an aerogel filling layer with a honeycomb hollow structure is filled between the anion exchange membrane and the reinforcement structure semipermeable membrane;

[0030] Each anion exchange membrane and two reinforced structural semipermeable membranes on both sides are fixed together in an exchange membrane support frame. The side wall of the exchange membrane fixed ring shell is provided with a plurality of exchange membrane fixed grooves radially penetrating along the outer shell of the biofilter tank. The exchange membrane support frame is fixed in the exchange membrane fixed grooves.

[0031] Description: Strengthen the design of the anion exchange membrane support structure to give it better mechanical strength and stability, enable it to work stably for a long time in a more complex wastewater environment, and improve the membrane's anti-pollution ability.

[0032] Preferably, the bottom of the inner shell of the biological filter tank is connected to the interior of the initial input space through a plurality of denitrification return pipes, and the denitrification return pipes are provided with return control valves.

[0033] Description: The returned wastewater is rich in nitrate nitrogen. The nitrate nitrogen enters the anode biological chamber through the anion exchange membrane in the cathode biological chamber and is reduced to nitrogen gas at the three-dimensional electrode anode plate in the anode biological chamber. The denitrification process is enhanced under the synergistic effect of microbiology and electrochemistry.

[0034] Preferably, the aeration mechanism includes a hollow annular aeration collection input shell fixed to the bottom of the inner shell of the biological filter tank. A plurality of aeration delivery pipes are arranged on the top of the aeration collection input shell and are connected through aeration delivery short pipes. The aeration delivery pipes are arranged along the radial extension of the inner shell of the biological filter tank. A plurality of aeration nozzles connected to the interior of the aeration delivery pipes are fixed on the upper side of the aeration delivery pipes.

[0035] Description: In the aeration mechanism, an air conveyor is used to continuously input air into the aeration input shell through a pipeline. The air is finally discharged from each aeration nozzle to fully contact with the wastewater to maintain the amount of oxygen dissolved in the wastewater.

[0036] Preferably, a circulation drive mechanism is provided on the top of the biofilter shell, the circulation drive mechanism comprises a circulation drive support ring rotatably connected to the upper end of the outer side of the biofilter inner shell, a plurality of circulation drive support beams extending radially along the biofilter shell are fixed to the outer side of the circulation drive support ring, two circulation drive plates are fixed to the lower side of each circulation drive support beam, and the circulation drive plates are arranged extending along the radial plane of the biofilter shell;

[0037] A circulation driving rod for driving the circulation driving support beam to rotate around the axis of the circulation driving support ring is arranged on the outer side of the biological filter tank shell.

[0038] Description: The wastewater to be treated is stirred by a circulating drive mechanism so that the wastewater can fully contact with the three-dimensional electrode composite filler.

[0039] Preferably, a circulation blocking control mechanism is provided on the circulation driving support beam, each circulation driving support beam has two vertically penetrating blocking plate connecting chutes, and the circulation blocking control mechanism comprises a blocking control plate slidably connected in the blocking plate connecting chutes;

[0040] The blocking control plate is provided with a plurality of blocking matching holes, and the circulating driving plate is provided with a plurality of circulating pressure relief holes;

[0041] A lifting fixed cylinder with an opening facing upward is fixed on the top of the circulation driving support beam, a lifting sliding cylinder with an opening facing downward is slidably connected inside the lifting fixed cylinder, and the top of the lifting sliding cylinder is fixedly connected to the upper end of the blocking control plate;

[0042] A lifting driving rod for driving the lifting sliding cylinder to move up and down is arranged in the lifting fixing cylinder.

[0043] Description: The circulation blocking control mechanism can control the connection state of each blocking matching hole and the circulation pressure relief hole, and then control the driving state of the circulation driving plate on the wastewater;

[0044] Enables wastewater to switch freely between continuous counterclockwise drive, continuous clockwise drive and "counterclockwise and clockwise reciprocating motion".

[0045] Preferably, the three-dimensional electrode system coupled with an anion exchange membrane wastewater treatment method is based on the above-mentioned three-dimensional electrode system coupled with anion exchange membrane wastewater treatment system, comprising the following steps:

[0046] S1. Wastewater pretreatment:

[0047] First, the wastewater to be treated is pumped into the grid filter tank of the pretreatment mechanism by a peristaltic pump, and the wastewater is filtered and intercepted by multiple mechanical grids;

[0048] The wastewater filtered and intercepted by the grid filter tank is then pumped into the pretreatment regulating tank by a peristaltic pump, where the wastewater is regulated in quality and treated by the grid filter tank and the pretreatment regulating tank to remove large inorganic impurities in the wastewater.

[0049] The water quality adjustment treatment time is 3 to 6 hours;

[0050] S2. Three-dimensional electrolysis treatment of wastewater:

[0051] The wastewater after water quality adjustment is transported to the outer shell of the biofilter by using a decentralized water inlet mechanism. The wastewater passes through the initial input space and the supporting layer accommodation space from bottom to top and then enters the three-dimensional electrolysis space.

[0052] The three-dimensional electrode anode plate and the three-dimensional electrode cathode plate are electrically connected to the positive electrode and the negative electrode of the three-dimensional electrolysis power supply respectively;

[0053] The distance between the three-dimensional electrode anode plate and the three-dimensional electrode cathode plate is 1~5cm, and the current density between the three-dimensional electrode anode plate and the three-dimensional electrode cathode plate is 2~10A / m 2 ;

[0054] Under the action of the microcurrent of the three-dimensional electrode system, the facultative denitrifying bacteria enriched on the three-dimensional electrode composite filler utilize the nitrate nitrogen and organic matter in the return wastewater to promote denitrification and promote the removal of nitrate nitrogen in the wastewater.

[0055] The filling rate of the three-dimensional electrode composite filler is 60%~80%V1 / V0, V1 is the filling volume of the three-dimensional electrode composite filler, and V0 is the volume of the three-dimensional electrolysis space;

[0056] At the same time, the nitrate nitrogen with high concentration in the return wastewater enters the anode biological chamber through the anion exchange membrane in the cathode biological chamber and is reduced to nitrogen gas in the anode biological chamber;

[0057] Wastewater is treated inside the three-dimensional electrolysis space for 2 to 4 hours;

[0058] S3, wastewater electrolysis MBBR treatment:

[0059] The liquid delivery pump on the input pipe of the electrolysis mechanism is used to deliver the treated wastewater in the three-dimensional electrolysis space to the inner shell of the biofilter to continue electrolytic MBBR treatment;

[0060] The microbial electrolysis anode plate and the microbial electrolysis cathode plate are electrically connected to the positive electrode and the negative electrode of the MBBR power supply respectively;

[0061] The distance between the microbial electrolysis anode plate and the microbial electrolysis cathode plate is 1~5cm, and the current density between the microbial electrolysis anode plate and the microbial electrolysis cathode plate is 2~10A / m 2 ;

[0062] The air conveyor is used to aerate the wastewater inside the inner shell of the biofilter through the pipeline. The air enters the wastewater to form small bubbles and move from bottom to top. The air bubbles are in full contact with the wastewater to maintain the amount of dissolved oxygen in the wastewater.

[0063] Under the action of electrochemical promotion, a large amount of biofilm grows on the fluidized filler after aerobic aeration. When the wastewater flows through it, the strong oxidation effect of the high-concentration active microorganisms enriched on the fluidized filler, as well as the bio-electro-flocculation and bio-oxidation of the microorganisms on the surface of the fluidized filler, can effectively remove organic matter and ammonia nitrogen in the wastewater.

[0064] The filling rate of fluidized filler is 20%~45%V1 / V0, V1 is the filling volume of fluidized filler, and V0 is the volume inside the inner shell of the biofilter;

[0065] The wastewater is treated inside the biofilter shell for 6 to 10 hours;

[0066] The dissolved oxygen of the wastewater inside the biofilter shell is controlled at 3~4mg / L;

[0067] S4. Wastewater return enhanced treatment:

[0068] The wastewater treated by electrolytic MBBR is transported back to the cathode biological chamber in the three-dimensional electrolysis space through the reflux pipe. The refluxed wastewater is rich in nitrate nitrogen. On the one hand, under the action of the microcurrent of the three-dimensional electrode system, the denitrification effect is significantly enhanced. On the other hand, the nitrate nitrogen enters the anode biological chamber through the anion exchange membrane in the cathode biological chamber and is reduced to nitrogen gas at the three-dimensional electrode anode plate in the anode biological chamber. The denitrification process is strengthened under the synergistic effect of microbiology and electrochemistry.

[0069] S5, Circulation Reflux Treatment:

[0070] The proportion of wastewater flowing back from the inner shell of the biological filter to the three-dimensional electrolysis space is 100% to 300% of the total volume of wastewater;

[0071] By reflux, the nitrification and denitrification processes are promoted to remove nitrogen from the wastewater, thus completing the wastewater treatment.

[0072] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0073] 1. The structure of the present invention is reasonably designed. The constructed three-dimensional electrode system promotes the biological metabolism of electrically activated denitrifying bacteria through microcurrent, and utilizes nitrate nitrogen in the returned wastewater to strengthen denitrification. At the same time, nitrate nitrogen is reduced in the anode biological chamber under the action of the anion membrane, and the denitrification denitrification process is synergistically strengthened. In addition, the filtering effect of the filter material can effectively reduce the concentration of suspended particulate matter;

[0074] 2. In the present invention, as the wastewater enters the electrolytic MBBR unit, under aerobic conditions, the electric current stimulates the microorganisms on the filler to undergo oxidation to enhance the removal of organic matter and ammonia nitrogen. Through the coupling of the three-dimensional electrolytic ion exchange biofilter and the electrolytic MBBR unit, the nitrification and denitrification process is enhanced, and the denitrification efficiency and organic matter removal rate are improved;

[0075] 3. The present invention has strong impact load resistance, produces a small amount of sludge, has low operation and maintenance costs, occupies a small area, and is simple to operate.

[0076] 4. The structural design of the three-dimensional electrode reaction zone of the present invention optimizes the specific structure of the "three-dimensional electrolytic ion exchange biofilter", so that the reaction treatment can be more efficient. The optimized "filter" structure has a more uniform internal microscopic reaction process, and the bottom of the "filter" is designed to facilitate maintenance and replacement of the "supporting layer";

[0077] 5. In the structural design, the present invention strengthens the support structure of the anion exchange membrane to make it have better mechanical strength and stability, so that it can work stably for a long time in a more complex wastewater environment, and improve the anti-pollution ability of the membrane;

[0078] 6. In the structural design, the present invention optimizes the filling method and particle size distribution of the conductive particles inside the three-dimensional electrode, so that the contact between the conductive particles is closer, the resistance is reduced, and the current efficiency is improved. At the same time, the combination of conductive particles of different particle sizes forms a multi-level pore structure, allowing the wastewater to better penetrate and react inside the electrode, thereby increasing the contact area of ​​the reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] Figure 1 It is a front view of the present invention;

[0080] Figure 2 yes Figure 1 Left view of

[0081] Figure 3 yes Figure 1 A top view of

[0082] Figure 4 yes Figure 1 Bottom view of

[0083] Figure 5 It is a structural schematic diagram of the circulation driving mechanism of the present invention;

[0084] Figure 6 yes Figure 5 A top view of

[0085] Figure 7 It is a structural schematic diagram of the lifting and fixing cylinder of the present invention;

[0086] Figure 8 is a top view of the three-dimensional electrode anode plate of the present invention;

[0087] Fig. 9 It is a structural schematic diagram of the supporting layer unit of the present invention;

[0088] Fig.10 yes Fig. 9 A top view of

[0089] Fig.11 is a schematic structural diagram of a three-dimensional electrode unit of the present invention;

[0090] Fig.12 It is a structural schematic diagram of the exchange membrane strengthening structure of the present invention;

[0091] Fig.13 yes Fig.12 Left view of

[0092] Fig.14 It is a schematic diagram of the structure of the input tube of the electrolysis mechanism of the present invention;

[0093] Fig.15 It is a schematic diagram of the mechanism of the biological wastewater treatment method of the present invention;

[0094] Fig.16 This is a comparison chart of COD removal effects between the wastewater biological treatment method of the present invention and the traditional process;

[0095] Fig.17 This is a comparison chart of TN removal effects between the wastewater biological treatment method of the present invention and the traditional process;

[0096] Fig.18 The present invention is a biological wastewater treatment method and the traditional process NH4 + -N removal effect comparison chart.

[0097] In the figure, 10-pretreatment mechanism, 11-grid filter tank, 12-pretreatment regulating tank, 13-dispersed water inlet mechanism, 130-dispersed water inlet through hole, 131-dispersed water inlet connecting shell, 132-dispersed water inlet input pipe, 14-circulation drive mechanism, 140-circulation drive plate, 1401-circulation pressure relief hole, 141-circulation drive support ring, 142-circulation drive support beam, 143-circulation drive rod, 1430-drive rod support seat, 15-circulation blocking control mechanism, 150-blocking plate connecting slide groove, 151-blocking control plate, 1510-blocking matching hole, 152-lifting fixed cylinder, 153-lifting sliding cylinder, 154-lifting driving rod, 20-three-dimensional electrolytic ion exchange mechanism, 200-three-dimensional electrolytic power supply, 201-initial input space, 202-supporting layer accommodating space, 203-three-dimensional electrolytic space, 204-anode biological chamber, 205-cathode biological chamber, 21-biofilter shell, 211-separation lower support plate, 212-separation upper support plate, 213-blank separation ring, 22-biofilter inner shell, 23-exchange membrane fixed ring shell, 230 - anion exchange membrane, 231- exchange membrane fixed groove, 24- three-dimensional electrode anode plate, 25- three-dimensional electrode cathode plate, 26- supporting layer unit, 260- supporting layer filler, 261- supporting layer unit shell, 262- supporting layer split shell, 263- end closure plate, 2630- supporting layer flow hole, 27- three-dimensional electrode unit, 270- three-dimensional electrode composite filler, 271- three-dimensional electrode containing shell, 29- exchange membrane strengthening structure, 290- exchange membrane support frame, 291- strengthening structure semipermeable membrane, 292- aerogel filling layer, 3 0-MBBR electrolysis mechanism, 300-MBBR power supply, 31-aeration mechanism, 311-aeration summary input shell, 3110-aeration delivery short pipe, 312-aeration delivery pipe, 313-aeration nozzle, 32-fluidized filler, 33-electrode support column, 34-microbial electrolysis anode plate, 35-microbial electrolysis cathode plate, 36-electrolysis mechanism input pipe, 361-dispersed delivery connecting pipe, 37-denitrification reflux pipe, 371-reflux control valve, 38-outlet summary ring shell, 381-outlet connecting branch pipe, 382-outlet external discharge pipe. DETAILED DESCRIPTION

[0098] Combine the following Figure 1-Figure 14 The present invention is described in detail. For the convenience of description, the directions mentioned below are defined as follows: the up, down, left, right, front, and back directions mentioned below are consistent with the up, down, left, right, front, and back directions of the projection relationship of the respective main views or structural schematic diagrams themselves. Embodiment 1:

[0099] Wastewater treatment system with three-dimensional electrode system coupled with anion exchange membrane, such as Figure 1 , Figure 3As shown, it includes a pretreatment mechanism 10, a three-dimensional electrolytic ion exchange mechanism 20 connected to the pretreatment mechanism 10, and an MBBR electrolysis mechanism 30 connected to the three-dimensional electrolytic ion exchange mechanism 20; Figure 3 As shown, the pretreatment mechanism 10 includes a grid-type filter pool 11, and the grid-type filter pool 11 is connected to a pretreatment regulating pool 12; the grid-type filter pool 11 has a plurality of mechanical grids of the prior art arranged in series; the pretreatment regulating pool 12 is provided with a mixer of the prior art; the output end of the grid-type filter pool 11 and the pretreatment regulating pool 12 are connected to a delivery pump of the prior art, which is used to deliver the wastewater treated by the grid-type filter pool 11 to the pretreatment regulating pool 12;

[0100] like Figure 1 As shown, the three-dimensional electrolytic ion exchange mechanism 20 includes a biofilter shell 21 with an opening facing upward, a horizontally arranged lower partition support plate 211 is fixed in the biofilter shell 21, a biofilter inner shell 22 with an opening facing upward is fixed on the top of the lower partition support plate 211, and a horizontally arranged upper partition support plate 212 is fixed in the biofilter shell 21 above the lower partition support plate 211; a blank partition ring 213 is fixed between the bottom of the biofilter shell 21 and the lower end of the lower partition support plate 211; the lower partition support plate 211 is fixed to the inner bottom of the biofilter shell 21. The plate 211 and the upper partition support plate 212 are both vertically through porous hollow structures; the initial input space 201 is formed between the lower partition support plate 211 and the bottom of the biofilter shell 21 and the outer wall of the blank partition ring 213, and the support layer accommodating space 202 is formed between the lower partition support plate 211 and the upper partition support plate 212; the upper part of the support layer accommodating space 202 is a backwashing area; the upper part of the upper partition support plate 212 and the inner wall of the biofilter shell 21 and the outer wall of the biofilter inner shell 22 form a three-dimensional space. 3D electrolysis space 203; the 3D electrolysis space 203 is filled with a plurality of 3D electrode units 27, the 3D electrode units 27 include a 3D electrode housing shell 271, the 3D electrode housing shell 271 is filled with a 3D electrode composite filler 270; the 3D electrode composite filler 270 is composed of activated carbon particles and ceramsite in a volume ratio of 1:8; the 3D electrode housing shell 271 is a truncated octahedral shell structure, and the side wall of the 3D electrode housing shell 271 is a porous hollow structure that is connected inside and outside; one of the end faces of the 3D electrode housing shell 271 is a snap-on disassembly structure, which is convenient for disassembling the end face shell, filling the 3D electrode composite filler 270 into the inside of the 3D electrode housing shell 271, and then snapping the end face shell back; the 3D electrode housing shell 271 with a truncated octahedral shell structure can be densely laid in a 3D space; a ring-shaped exchange membrane fixing ring shell 23 with a vertically extending axis is fixed on the top of the partition upper support plate 212, and a plurality of anion exchange membranes 230 are fixed on the side wall of the exchange membrane fixing ring shell 23;

[0101] like Figure 8As shown, the exchange membrane fixed ring shell 23 divides the three-dimensional electrolysis space 203 into an anode biological chamber 204 and a cathode biological chamber 205. A plurality of three-dimensional electrode anode plates 24 are arranged in the anode biological chamber 204, and a plurality of three-dimensional electrode cathode plates 25 are arranged in the cathode biological chamber 205. The three-dimensional electrode anode plates 24 are made of ruthenium iridium titanium plates, and the three-dimensional electrode cathode plates 25 are made of titanium plates. The three-dimensional electrode anode plates 24 and the three-dimensional electrode cathode plates 25 are electrically connected to the positive electrode and the negative electrode of the three-dimensional electrolysis power supply 200, respectively.

[0102] The MBBR electrolysis mechanism 30 includes an aeration mechanism 31 arranged inside the inner shell 22 of the biofilter and a fluidized filler 32 filled inside the inner shell 22 of the biofilter; the fluidized filler 32 is an SPR-1 type filler; a vertically extending electrode support column 33 is fixed inside the inner shell 22 of the biofilter, a plurality of microbial electrolysis anode plates 34 are fixed on the inner side wall of the inner shell 22 of the biofilter, and a plurality of microbial electrolysis cathode plates 35 are fixed on the electrode support column 33; the microbial electrolysis anode plate 34 is a ruthenium iridium titanium plate, and the microbial electrolysis cathode plate 35 is a titanium plate; the microbial electrolysis anode plate 34 and the microbial electrolysis cathode plate 35 are electrically connected to the positive electrode and the negative electrode of the MBBR power supply 300 respectively; a plurality of electrolysis mechanism input pipes 36 connected to the inside of the biofilter are fixed on the outside of the inner shell 22 of the biofilter, the electrolysis mechanism input pipes 36 are arranged along the radial extension of the inner shell 22 of the biofilter, and a plurality of dispersed transport connecting pipes 361 connected to the inner shell 22 and extending vertically are fixed on the lower side of the electrolysis mechanism input pipe 36;

[0103] like Fig.14 As shown, an outlet water collection ring shell 38 is fixed on the outside of the electrode support column 33, a plurality of outlet water connecting branch pipes 381 connected to the inside of the outlet water collection ring shell 38 are fixed on the lower side, and an outlet water external discharge pipe 382 connected to the inside of the outlet water collection ring shell 38 is fixed on the upper side; a liquid delivery pump of the prior art is provided on the electrolysis mechanism input pipe 36, which is used to deliver the treated wastewater in the three-dimensional electrolysis space 203 to the inside of the biological filter tank inner shell 22 for further electrolysis MBBR treatment;

[0104] like Figure 1 As shown, a plurality of supporting layer units 26 are provided in the supporting layer accommodating space 202. Fig. 9 , Fig.10 As shown, the supporting layer unit 26 includes a supporting layer unit shell 261 which is vertically penetrated and is a regular hexagonal prism, a plurality of vertically penetrated supporting layer split shells 262 are fixed in the supporting layer unit shell 261, and the supporting layer split shells 262 are filled with supporting layer fillers 260; the supporting layer fillers 260 are pebbles with a particle size of 2 to 5 cm; an end closing plate 263 is fixed in the upper and lower ends of the supporting layer split shell 262, and the end closing plate 263 has a plurality of vertically penetrated supporting layer flow holes 2630.

[0105] like Fig.12 , Fig.13 As shown, the anion exchange membrane 230 has an exchange membrane reinforcement structure 29, and the exchange membrane reinforcement structure 29 includes a reinforcement structure semipermeable membrane 291 arranged in parallel and fixed on both sides of the anion exchange membrane 230, and an aerogel filling layer 292 with a honeycomb hollow structure is filled between the anion exchange membrane 230 and the reinforcement structure semipermeable membrane 291; each anion exchange membrane 230 and the two reinforcement structure semipermeable membranes 291 on both sides are fixed together in an exchange membrane support frame 290, and the side wall of the exchange membrane fixing ring shell 23 has a plurality of exchange membrane fixing grooves 231 radially penetrating along the biological filter tank shell 21, and the exchange membrane support frame 290 is fixed in the exchange membrane fixing grooves 231.

[0106] like Figure 1 As shown, the bottom of the biological filter tank inner shell 22 is connected to the interior of the initial input space 201 through a plurality of denitrification return pipes 37, and the denitrification return pipes 37 are provided with a return control valve 371;

[0107] The denitrification reflux pipe 37 is provided with a liquid delivery pump according to the prior art, which is used to reflux the wastewater in the inner shell 22 of the biological filter tank to the three-dimensional electrolysis space 203 . Embodiment 2:

[0108] This embodiment describes a wastewater treatment method using a three-dimensional electrode system coupled with an anion exchange membrane. The wastewater treatment system using a three-dimensional electrode system coupled with an anion exchange membrane in the above embodiment 1 includes the following steps:

[0109] S1. Wastewater pretreatment:

[0110] First, the wastewater to be treated is pumped into the grid filter pool 11 of the pretreatment mechanism 10 by a peristaltic pump, and the wastewater is filtered and intercepted by multiple mechanical grids of the prior art; the wastewater filtered and intercepted by the grid filter pool 11 is then pumped into the pretreatment regulating pool 12 by a peristaltic pump, and the water quality of the wastewater is adjusted in the pretreatment regulating pool 12, and the large particles of inorganic impurities in the wastewater are removed by the grid filter pool 11 and the pretreatment regulating pool 12; the water quality adjustment treatment time is 3 hours;

[0111] S2. Three-dimensional electrolysis treatment of wastewater:

[0112] The wastewater after water quality adjustment is transported to the biological filter shell 21 by using the decentralized water inlet mechanism 13, and the wastewater passes through the initial input space 201 and the supporting layer accommodating space 202 from bottom to top and then enters the three-dimensional electrolysis space 203; the three-dimensional electrode anode plate 24 and the three-dimensional electrode cathode plate 25 are electrically connected to the positive electrode and the negative electrode of the three-dimensional electrolysis power supply 200 respectively; the distance between the three-dimensional electrode anode plate 24 and the three-dimensional electrode cathode plate 25 is 1 cm, and the current density between the three-dimensional electrode anode plate 24 and the three-dimensional electrode cathode plate 25 is 2A / m 2 ; Under the action of the microcurrent of the three-dimensional electrode system, the specific surface area of ​​the contact between the microorganism and the electrode increases, and the biological metabolism of the electrically activated denitrifying bacteria is promoted by the microcurrent. The facultative denitrifying bacteria that are enhanced and enriched on the three-dimensional electrode composite filler 270 use the nitrate nitrogen and organic matter in the return wastewater to promote denitrification, thereby promoting the removal of nitrate nitrogen in the wastewater; the filling rate of the three-dimensional electrode composite filler 270 is 60% V1 / V0, V1 is the filling volume of the three-dimensional electrode composite filler 270, and V0 is the volume of the three-dimensional electrolytic space 203; the three-dimensional electrode composite filler 270 is composed of activated carbon particles and ceramsite in a volume ratio of 1:8; at the same time, the nitrate nitrogen with a high concentration in the return wastewater enters the anode biological chamber 204 through the anion exchange membrane 230 in the cathode biological chamber 205, and is reduced to nitrogen gas in the anode biological chamber 204, thereby strengthening the denitrification process under the synergistic action of microbiology and electrochemistry; the wastewater is treated inside the three-dimensional electrolytic space 203 for 2 hours; the backwash gas-water ratio is 25:1;

[0113] This process strengthens the denitrification process of wastewater treatment under the synergistic effect of microbiology and electrochemistry.

[0114] S3, wastewater electrolysis MBBR treatment:

[0115] The treated wastewater in the three-dimensional electrolysis space 203 is transported to the inner shell 22 of the biofilter tank for further MBBR electrolysis treatment by using the prior art liquid delivery pump on the electrolysis mechanism input pipe 36; the microbial electrolysis anode plate 34 and the microbial electrolysis cathode plate 35 are electrically connected to the positive and negative electrodes of the MBBR power supply 300 respectively; the distance between the microbial electrolysis anode plate 34 and the microbial electrolysis cathode plate 35 is 1 cm, and the current density between the microbial electrolysis anode plate 34 and the microbial electrolysis cathode plate 35 is 2A / m 2; Under the action of electrochemical promotion, after aerobic aeration, a large amount of biofilm grows on the fluidized filler 32. When the wastewater flows through and contacts it, the strong oxidation effect of the high-concentration active microorganisms enriched on the fluidized filler 32, as well as the bio-electro-flocculation and bio-oxidation effects of the microorganisms on the surface of the fluidized filler 32, are utilized to efficiently remove organic matter and ammonia nitrogen in the wastewater; the filling rate of the fluidized filler 32 is 20% V1 / V0, V1 is the filling volume of the fluidized filler 32, and V0 is the volume inside the inner shell 22 of the biofilter; the wastewater is treated inside the inner shell 22 of the biofilter for 6 hours; the dissolved oxygen of the wastewater inside the inner shell 22 of the biofilter is controlled at 3 mg / L; the wastewater is refluxed to provide electron acceptors for the denitrification in the three-dimensional electrolysis space 203 at the front end. In addition, the three-dimensional electrolysis space 203 at the front end can effectively improve the shock load resistance of the subsequent MBBR electrolysis mechanism 30, and the overall system has a strong shock load resistance;

[0116] S4. Wastewater return enhanced treatment:

[0117] For the wastewater treated by the electrolytic MBBR, the reflux control valve 371 is opened, and the wastewater in the inner shell 22 of the biological filter is refluxed to the cathode biological chamber 205 in the three-dimensional electrolysis space 203 by using the liquid delivery pump of the prior art on the denitrification reflux pipe 37. The refluxed wastewater is rich in nitrate nitrogen. On the one hand, under the action of the microcurrent of the three-dimensional electrode system, the denitrification effect is significantly enhanced. On the other hand, the nitrate nitrogen enters the anode biological chamber 204 through the anion exchange membrane 230 in the cathode biological chamber 205, and is reduced to nitrogen gas at the three-dimensional electrode anode plate 24 in the anode biological chamber 204, thereby strengthening the denitrification process under the synergistic action of microbiology and electrochemistry.

[0118] S5, Circulation Reflux Treatment:

[0119] The proportion of wastewater that flows back from the biological filter inner shell 22 to the three-dimensional electrolysis space 203 is 100% of the total volume of the wastewater; through the backflow, the nitrification and denitrification process is promoted to achieve the removal of nitrogen in the wastewater, that is, the treatment of the wastewater is completed. Embodiment 3:

[0120] On the basis of Example 1, Figure 1 , Figure 4 As shown, the pretreatment regulating tank 12 is connected to the initial input space 201 through a decentralized water inlet mechanism 13. The decentralized water inlet mechanism 13 includes a plurality of decentralized water inlet connecting shells 131 fixed to the bottom of the biological filter tank shell 21. The bottom of the biological filter tank shell 21 has a plurality of decentralized water inlet through holes 130 so that the initial input space 201 is connected to the inside of the decentralized water inlet connecting shell 131. A decentralized water inlet input pipe 132 connected to the inside of the decentralized water inlet connecting shell 131 is fixed to the outside of the decentralized water inlet connecting shell 131, and the other end of the decentralized water inlet input pipe 132 is connected to the pretreatment regulating tank 12. Embodiment 4:

[0121] This embodiment records a wastewater treatment method of a three-dimensional electrode system coupled with an anion exchange membrane. The wastewater treatment system of the three-dimensional electrode system coupled with anion exchange membrane based on the above-mentioned embodiment 3 is different from that of embodiment 2 in that, in step S2, the wastewater to be treated is more evenly transported to the biological filter shell 21 through the decentralized water inlet mechanism 13; the wastewater that has been water-quality regulated in the pretreatment regulating tank 12 enters the decentralized water inlet input pipe 132, and the decentralized water inlet input pipe 132 is provided with a liquid delivery pump of the prior art. The liquid delivery pump is used to transport the wastewater to the decentralized water inlet connecting shell 131, and the wastewater continues to pass through each decentralized water inlet through hole 130 to enter the initial input space 201 in the biological filter shell 21, and the wastewater continues to pass through the supporting layer accommodating space 202 and then enters the three-dimensional electrolysis space 203. Embodiment 5:

[0122] On the basis of Example 3, Figure 5 , Figure 6 As shown, a circulation drive mechanism 14 is provided on the top of the biofilter tank shell 21, and the circulation drive mechanism 14 includes a circulation drive support ring 141 rotatably connected to the upper end of the outer side of the biofilter tank inner shell 22, and a plurality of circulation drive support beams 142 extending radially along the biofilter tank shell 21 are fixed to the outer side of the circulation drive support ring 141, and two circulation drive plates 140 are fixed to the lower side of each circulation drive support beam 142, and the circulation drive plates 140 are extended and arranged along the radial plane of the biofilter tank shell 21;

[0123] A circulation drive rod 143 is provided on the outside of the biological filter tank shell 21 for driving the circulation drive support beam 142 to rotate around the axis of the circulation drive support ring 141; the circulation drive rod 143 is an electrically controlled telescopic rod in the prior art, and a drive rod support seat 1430 is fixed on the outside of the biological filter tank shell 21, and the outer rod end of the circulation drive rod 143 is connected to the drive rod support seat 1430 in the form of a fixed hinge, and the inner rod end of the circulation drive rod 143 is connected to the outer end of one of the circulation drive support beams 142 in the form of a fixed hinge.

[0124] A circulation blocking control mechanism 15 is provided on the circulation driving support beam 142. Each circulation driving support beam 142 has two vertically penetrating blocking plate connecting chutes 150. The circulation blocking control mechanism 15 includes a blocking control plate 151 slidably connected in the blocking plate connecting chutes 150. The blocking control plate 151 corresponds to the circulation driving plate 140 in parallel and the side walls are arranged in close contact with each other. The blocking control plate 151 has a plurality of blocking matching holes 1510, and the circulation driving plate 140 has a plurality of circulation pressure relief holes 1401.

[0125] A lifting fixed cylinder 152 with an opening facing upward is fixed on the top of the circulation driving support beam 142, a lifting sliding cylinder 153 with an opening facing downward is slidably connected inside the lifting fixed cylinder 152, and the top of the lifting sliding cylinder 153 is fixedly connected to the upper end of the blocking control plate 151;

[0126] A lifting drive rod 154 is provided inside the lifting fixed cylinder 152 for driving the lifting sliding cylinder 153 to lift and move. The lifting drive rod 154 is an electrically controlled telescopic rod according to the prior art. The outer rod end of the lifting drive rod 154 is fixedly connected to the bottom of the lifting fixed cylinder 152, and the inner rod end of the lifting drive rod 154 is fixedly connected to the top of the lifting sliding cylinder 153. Embodiment 6:

[0127] This embodiment describes a wastewater treatment method using a three-dimensional electrode system coupled with an anion exchange membrane. The wastewater treatment system using a three-dimensional electrode system coupled with an anion exchange membrane according to the above-mentioned embodiment 5 is different from that of embodiment 4 in that, in step S2, the wastewater to be treated is stirred by a circulation driving mechanism 14 so that the wastewater can fully contact with the three-dimensional electrode composite filler 270.

[0128] Instructions attached Figure 6 For reference, the extension or retraction of the inner rod of the circulation drive rod 143 can drive the circulation drive support beam 142 and the circulation drive support ring 141 to rotate counterclockwise or clockwise around the vertical axis of the inner shell 22 of the biological filter tank; during the extension of the inner rod of the circulation drive rod 143, the circulation drive support beam 142 and the circulation drive support ring 141 rotate counterclockwise around the vertical axis of the inner shell 22 of the biological filter tank, and the multiple circulation drive plates 140 can drive the three-dimensional electrolysis space 203 moves counterclockwise together; during the retraction of the inner rod of the circulation drive rod 143, the circulation drive support beam 142 and the circulation drive support ring 141 rotate clockwise around the vertical axis of the inner shell 22 of the biological filter tank, and the multiple circulation drive plates 140 can drive the wastewater in the three-dimensional electrolysis space 203 to move clockwise together; the circulation blocking control mechanism 15 can control the connection state of each blocking matching hole 1510 and the circulation pressure relief hole 1401;

[0129] When the inner rod of the lifting driving rod 154 is in a retracted state, the blocking matching hole 1510 on the blocking control plate 151 and the circulating pressure relief hole 1401 on the circulating driving plate 140 are in an isolated state;

[0130] When the inner rod of the lifting driving rod 154 is in the extended state, the lifting sliding cylinder 153 is driven to move upward together with the blocking control plate 151, so that the blocking matching hole 1510 on the blocking control plate 151 and the circulating pressure relief hole 1401 on the circulating driving plate 140 are in a one-to-one corresponding communication state. At this time, when the circulating driving plate 140 and the wastewater move relative to each other, the wastewater can pass through the blocking matching hole 1510 and the circulating pressure relief hole 1401, thereby offsetting the driving of the wastewater by the circulating driving plate 140;

[0131] When the wastewater needs to be driven counterclockwise continuously, during the extension of the inner rod of the circulation driving rod 143, the blocking matching hole 1510 on the blocking control plate 151 and the circulation pressure relief hole 1401 on the circulation driving plate 140 are in an isolated state, and during the retraction of the inner rod of the circulation driving rod 143, the blocking matching hole 1510 on the blocking control plate 151 and the circulation pressure relief hole 1401 on the circulation driving plate 140 are in a one-to-one corresponding communication state.

[0132] When the wastewater needs to be driven continuously clockwise, during the extension of the inner rod of the circulation driving rod 143, the blocking matching hole 1510 on the blocking control plate 151 and the circulation pressure relief hole 1401 on the circulation driving plate 140 are in a one-to-one corresponding communication state, and during the retraction of the inner rod of the circulation driving rod 143, the blocking matching hole 1510 on the blocking control plate 151 and the circulation pressure relief hole 1401 on the circulation driving plate 140 are in an isolated state. Embodiment 7:

[0133] On the basis of Example 5, Fig.14 As shown, the aeration mechanism 31 includes a hollow annular aeration collection input shell 311 fixed to the bottom of the inner shell 22 of the biological filter tank. A plurality of aeration delivery pipes 312 are arranged on the top of the aeration collection input shell 311 through an aeration delivery short pipe 3110. The aeration delivery pipes 312 are arranged to extend radially along the inner shell 22 of the biological filter tank. A plurality of aeration nozzles 313 connected to the interior of the aeration delivery pipe 312 are fixed on the upper side of the aeration delivery pipe 312.

[0134] The difference from the fifth embodiment is that the fluidized filler 32 is a magnetic fluid filler. Embodiment 8:

[0135] This embodiment records a wastewater treatment method using a three-dimensional electrode system coupled with an anion exchange membrane. The wastewater treatment system using a three-dimensional electrode system coupled with an anion exchange membrane based on the above-mentioned embodiment 7 is different from that of embodiment 6 in that, in step S3, an air conveyor of the prior art is used to continuously input air into the aeration aggregate input shell 311 through a pipeline, and the air in the aeration aggregate input shell 311 enters each aeration conveying pipe 312 respectively, and the air in the aeration conveying pipe 312 is then discharged from each aeration nozzle 313. The air enters the wastewater to form small bubbles and moves from bottom to top, and the air bubbles are in full contact with the wastewater to maintain the amount of dissolved oxygen in the wastewater. Embodiment 9:

[0136] The difference from Example 8 is that in step S1, the water quality adjustment treatment time is 5 hours;

[0137] In step S2, the distance between the three-dimensional electrode anode plate 24 and the three-dimensional electrode cathode plate 25 is 5 cm, and the current density between the three-dimensional electrode anode plate 24 and the three-dimensional electrode cathode plate 25 is 2 A / m 2 ;

[0138] The filling rate of the three-dimensional electrode composite filler 270 is 70% V1 / V0, where V1 is the filling volume of the three-dimensional electrode composite filler 270, and V0 is the volume of the three-dimensional electrolysis space 203;

[0139] The three-dimensional electrode composite filler 270 is composed of activated carbon particles and ceramsite in a volume ratio of 1:8;

[0140] The wastewater is treated inside the three-dimensional electrolysis space 203 for 2 hours;

[0141] The backwash gas-water ratio is 25:1;

[0142] In step S3, the distance between the microbial electrolysis anode plate 34 and the microbial electrolysis cathode plate 35 is 5 cm, and the current density between the microbial electrolysis anode plate 34 and the microbial electrolysis cathode plate 35 is 2 A / m 2 ;

[0143] The filling rate of the fluidized filler 32 is 20% V1 / V0, V1 is the filling volume of the fluidized filler 32, and V0 is the volume inside the biofilter inner shell 22;

[0144] The wastewater is treated inside the biofilter inner shell 22 for 6 hours;

[0145] The dissolved oxygen of the wastewater inside the biofilter inner shell 22 is controlled at 3.5 mg / L;

[0146] In step S5, the proportion of wastewater that flows back from the biological filter inner shell 22 to the three-dimensional electrolysis space 203 is 100% of the total volume of the wastewater.

[0147] Embodiment 10:

[0148] The difference from Example 8 is that in step S1, the water quality adjustment treatment time is 3 hours;

[0149] In step S2, the distance between the three-dimensional electrode anode plate 24 and the three-dimensional electrode cathode plate 25 is 2.5 cm, and the current density between the three-dimensional electrode anode plate 24 and the three-dimensional electrode cathode plate 25 is 5 A / m 2 ;

[0150] The filling rate of the three-dimensional electrode composite filler 270 is 80% V1 / V0, where V1 is the filling volume of the three-dimensional electrode composite filler 270, and V0 is the volume of the three-dimensional electrolysis space 203;

[0151] The three-dimensional electrode composite filler 270 is composed of activated carbon particles and ceramsite in a volume ratio of 1:9;

[0152] The wastewater is treated inside the three-dimensional electrolysis space 203 for 3 hours;

[0153] The backwash gas-water ratio is 25:1;

[0154] In step S3, the distance between the microbial electrolysis anode plate 34 and the microbial electrolysis cathode plate 35 is 2.5 cm, and the current density between the microbial electrolysis anode plate 34 and the microbial electrolysis cathode plate 35 is 5 A / m 2 ;

[0155] The filling rate of the fluidized filler 32 is 30% V1 / V0, V1 is the filling volume of the fluidized filler 32, and V0 is the volume inside the biofilter inner shell 22;

[0156] The wastewater is treated inside the biofilter inner shell 22 for 8 hours;

[0157] The dissolved oxygen of the wastewater inside the biofilter inner shell 22 is controlled at 3.5 mg / L;

[0158] In step S5, the proportion of wastewater that flows back from the biological filter inner shell 22 to the three-dimensional electrolysis space 203 is 250% of the total volume of the wastewater.

[0159] Embodiment 11:

[0160] The difference from Example 8 is that in step S1, the water quality adjustment treatment time is 6 hours;

[0161] In step S2, the distance between the three-dimensional electrode anode plate 24 and the three-dimensional electrode cathode plate 25 is 1 cm, and the current density between the three-dimensional electrode anode plate 24 and the three-dimensional electrode cathode plate 25 is 10 A / m 2 ;

[0162] The filling rate of the three-dimensional electrode composite filler 270 is 60% V1 / V0, where V1 is the filling volume of the three-dimensional electrode composite filler 270, and V0 is the volume of the three-dimensional electrolysis space 203;

[0163] The three-dimensional electrode composite filler 270 is composed of activated carbon particles and ceramsite in a volume ratio of 1:10;

[0164] The wastewater is treated inside the three-dimensional electrolysis space 203 for 4 hours;

[0165] The backwash gas-water ratio is 30:1;

[0166] In step S3, the distance between the microbial electrolysis anode plate 34 and the microbial electrolysis cathode plate 35 is 1 cm, and the current density between the microbial electrolysis anode plate 34 and the microbial electrolysis cathode plate 35 is 10 A / m 2 ;

[0167] The filling rate of the fluidized filler 32 is 45% V1 / V0, V1 is the filling volume of the fluidized filler 32, and V0 is the volume inside the biofilter inner shell 22;

[0168] The wastewater is treated inside the biofilter inner shell 22 for 10 hours;

[0169] The dissolved oxygen of the wastewater inside the biofilter inner shell 22 is controlled at 3.5 mg / L;

[0170] In step S5, the proportion of wastewater that flows back from the biological filter inner shell 22 to the three-dimensional electrolysis space 203 is 300% of the total volume of the wastewater.

[0171] Comparative Example 1:

[0172] A control group MBBR process was set up. The structural composition of the control group MBBR process was consistent with the structure of the MBBR electrolysis mechanism 30 in Example 9, and the operating parameters and wastewater influent water quality indicators were consistent with those in the Example 9 process.

[0173] Data Analysis 1:

[0174] According to data detection and comparative analysis, for wastewater with influent COD: 110 mg / L and TN: 15 mg / L, the effluent COD removal rate of wastewater purification by the process of Example 9 reached 83.2%, which was 6% higher than that of the MBBR process in the control group; the TN removal rate reached 51%, which was 1.3 times higher than that of the MBBR process in the control group; and the NH4 + The -N removal efficiency reached 90.1%, which was comparable to that of the MBBR process in the control group.

[0175] Comparative Example 2:

[0176] A control group MBBR process was set up, and the structural composition of the control group MBBR process was consistent with the structure of the MBBR electrolysis mechanism 30 in Example 10, and the operating parameters and wastewater influent water quality indicators were consistent with those in the process of Example 10.

[0177] Data Analysis 2:

[0178] like Figures 15 to 18 As shown, after data detection and comparative analysis, for wastewater with influent COD: 111 mg / L and TN: 15 mg / L, the effluent COD removal rate of wastewater purification treatment using the process of Example 10 reached 88.2%, which was 13% higher than that of the MBBR process in the control group; the TN removal rate reached 64.4%, which was 1.9 times higher than that of the MBBR process in the control group; and the NH4 + The -N removal efficiency reached 92.0%, which was comparable to that of the MBBR process in the control group.

[0179] Comparative Example 3:

[0180] A control group MBBR process was set up, and the structural composition of the control group MBBR process was consistent with the structure of the MBBR electrolysis mechanism 30 in Example 11, and the operating parameters and wastewater influent water quality indicators were consistent with those in the process of Example 11.

[0181] Data Analysis 3:

[0182] According to data detection and comparative analysis, for wastewater with influent COD: 111 mg / L and TN: 15 mg / L, the effluent COD removal rate of wastewater purification by the process of Example 11 reached 85.6%, which was 10% higher than that of the MBBR process in the control group; the TN removal rate reached 58.7%, which was 1.6 times higher than that of the MBBR process in the control group; and the NH4 + The -N removal efficiency reached 91.2%, which was comparable to that of the MBBR process in the control group.

[0183] In summary, the wastewater biological treatment process based on the three-dimensional electrode system coupled with anion exchange membrane provided by the present invention has a COD removal rate increased by 6% to 13%, a TN removal rate increased by 1.3 to 1.9 times, and a NH4 + -N removal efficiency is comparable.

Claims

1. A wastewater treatment system with a three-dimensional electrode system coupled with an anion exchange membrane, characterized in that: It comprises a pretreatment mechanism (10), a three-dimensional electrolytic ion exchange mechanism (20) connected to the pretreatment mechanism (10), and an MBBR electrolysis mechanism (30) connected to the three-dimensional electrolytic ion exchange mechanism (20); The pretreatment mechanism (10) comprises a grid-type filter tank (11), and the grid-type filter tank (11) is connected to a pretreatment regulating tank (12); The three-dimensional electrolytic ion exchange mechanism (20) comprises a biofilter tank shell (21) with an opening facing upward, a horizontally arranged lower partition support plate (211) being fixed inside the biofilter tank shell (21), a biofilter tank inner shell (22) with an opening facing upward being fixed on the top of the lower partition support plate (211), and a horizontally arranged upper partition support plate (212) being fixed inside the biofilter tank shell (21) and located above the lower partition support plate (211); A blank separation ring (213) is fixed between the inner bottom of the biofilter housing (21) and the lower end of the separation lower support plate (211); An initial input space (201) is formed between the lower partition support plate (211), the inner bottom of the biofilter housing (21), and the outer side wall of the blank partition ring (213), and a supporting layer accommodating space (202) is formed between the lower partition support plate (211) and the upper partition support plate (212); A three-dimensional electrolysis space (203) is formed between the upper portion of the partition upper support plate (212), the inner wall of the biofilter tank outer shell (21), and the outer wall of the biofilter tank inner shell (22); The three-dimensional electrolysis space (203) is filled with a plurality of three-dimensional electrode units (27), wherein the three-dimensional electrode unit (27) comprises a three-dimensional electrode containing shell (271), and the three-dimensional electrode containing shell (271) is filled with a three-dimensional electrode composite filler (270); The three-dimensional electrode composite filler (270) is composed of activated carbon particles and ceramsite in a volume ratio of 1:8-10; A ring-shaped exchange membrane fixing ring shell (23) with a vertically extending axis is fixed on the top of the partition upper support plate (212), and a plurality of anion exchange membranes (230) are fixed on the side wall of the exchange membrane fixing ring shell (23); The exchange membrane fixed ring shell (23) divides the three-dimensional electrolysis space (203) into an anode biological chamber (204) and a cathode biological chamber (205); a plurality of three-dimensional electrode anode plates (24) are arranged in the anode biological chamber (204); and a plurality of three-dimensional electrode cathode plates (25) are arranged in the cathode biological chamber (205); The three-dimensional electrode anode plate (24) and the three-dimensional electrode cathode plate (25) are electrically connected to the positive electrode and the negative electrode of the three-dimensional electrolysis power source (200), respectively; The MBBR electrolysis mechanism (30) comprises an aeration mechanism (31) arranged inside the inner shell (22) of the biofilter tank and a fluidized filler (32) filled inside the inner shell (22) of the biofilter tank; A vertically extending electrode support column (33) is fixed inside the inner shell (22) of the biofilter tank, a plurality of microbial electrolysis anode plates (34) are fixed to the inner side wall of the inner shell (22) of the biofilter tank, and a plurality of microbial electrolysis cathode plates (35) are fixed to the electrode support column (33); The microbial electrolysis anode plate (34) and the microbial electrolysis cathode plate (35) are electrically connected to the positive electrode and the negative electrode of the MBBR power supply (300), respectively; A plurality of electrolysis mechanism input pipes (36) connected to the interior of the biofilter tank inner shell (22) are fixed on the outside of the biofilter tank inner shell (22); the electrolysis mechanism input pipes (36) are arranged to extend radially along the biofilter tank inner shell (22); and a plurality of vertically extending dispersed transport communication pipes (361) connected to the electrolysis mechanism input pipe (36) are fixed on the bottom of the electrolysis mechanism input pipe (36); A water outlet collecting ring shell (38) is fixed to the outside of the electrode support column (33); a plurality of water outlet connecting branch pipes (381) connected to the inside of the water outlet collecting ring shell (38) are fixed to the bottom of the water outlet collecting ring shell (38); and a water outlet external discharge pipe (382) connected to the inside of the water outlet collecting ring shell (38) is fixed to the top of the water outlet collecting ring shell (38).

2. The three-dimensional electrode system coupled with anion exchange membrane wastewater treatment system according to claim 1, characterized in that: The pretreatment regulating tank (12) is connected to the initial input space (201) via a decentralized water inlet mechanism (13), wherein the decentralized water inlet mechanism (13) comprises a plurality of decentralized water inlet connecting shells (131) fixed to the bottom of the biofilter shell (21), and the bottom of the biofilter shell (21) has a plurality of decentralized water inlet through holes (130) to connect the initial input space (201) with the inside of the decentralized water inlet connecting shell (131); A dispersed water inlet pipe (132) connected to the interior of the dispersed water inlet connecting shell (131) is fixed to the outside of the dispersed water inlet connecting shell (131), and the other end of the dispersed water inlet pipe (132) is connected to the pretreatment regulating tank (12).

3. The three-dimensional electrode system coupled with anion exchange membrane wastewater treatment system according to claim 1, characterized in that: A plurality of supporting layer units (26) are arranged in the supporting layer accommodating space (202), the supporting layer units (26) comprising a vertically penetrating supporting layer unit shell (261) in the form of a regular hexagonal prism, a plurality of vertically penetrating supporting layer split shells (262) are fixed in the supporting layer unit shell (261), and the supporting layer split shells (262) are filled with supporting layer fillers (260); An end closing plate (263) is fixed in each of the upper and lower ends of the supporting layer split shell (262), and the end closing plate (263) has a plurality of vertically penetrating supporting layer flow holes (2630).

4. The three-dimensional electrode system coupled with anion exchange membrane wastewater treatment system according to claim 1, characterized in that: The anion exchange membrane (230) has an exchange membrane reinforcement structure (29), the exchange membrane reinforcement structure (29) comprising reinforcement structure semipermeable membranes (291) arranged in parallel and fixed on both sides of the anion exchange membrane (230), and an aerogel filling layer (292) with a honeycomb hollow structure is filled between the anion exchange membrane (230) and the reinforcement structure semipermeable membrane (291); Each of the anion exchange membranes (230) and the two reinforced structure semipermeable membranes (291) on both sides are fixed together in an exchange membrane support frame (290); the side wall of the exchange membrane fixing ring shell (23) has a plurality of exchange membrane fixing grooves (231) radially extending through the biofilter shell (21); and the exchange membrane support frame (290) is fixed in the exchange membrane fixing grooves (231).

5. The three-dimensional electrode system coupled with anion exchange membrane wastewater treatment system according to claim 1, characterized in that: The bottom of the biological filter tank inner shell (22) is connected to the interior of the initial input space (201) via a plurality of denitrification return pipes (37), and a return control valve (371) is provided on the denitrification return pipe (37).

6. The three-dimensional electrode system coupled with anion exchange membrane wastewater treatment system according to claim 1, characterized in that: The aeration mechanism (31) comprises an aeration collection input shell (311) which is fixed to the bottom of the inner shell (22) of the biological filter tank and is in the form of a hollow ring. The top of the aeration collection input shell (311) is connected to a plurality of aeration delivery pipes (312) via an aeration delivery short pipe (3110). The aeration delivery pipes (312) are arranged to extend radially along the inner shell (22) of the biological filter tank. A plurality of aeration nozzles (313) which are connected to the interior of the aeration delivery pipes (312) are fixed to the upper side of the aeration delivery pipes (312).

7. The three-dimensional electrode system coupled with anion exchange membrane wastewater treatment system according to claim 1, characterized in that: A circulation drive mechanism (14) is provided on the top of the biofilter tank shell (21), the circulation drive mechanism (14) comprising a circulation drive support ring (141) rotatably connected to the upper end of the outer side of the biofilter tank inner shell (22), a plurality of circulation drive support beams (142) extending radially along the biofilter tank shell (21) are fixed to the outer side of the circulation drive support ring (141), two circulation drive plates (140) are fixed to the lower side of each of the circulation drive support beams (142), and the circulation drive plates (140) are arranged to extend along the radial plane of the biofilter tank shell (21); A circulation drive rod (143) for driving the circulation drive support beam (142) to rotate around the axis of the circulation drive support ring (141) is provided on the outside of the biological filter tank shell (21).

8. The three-dimensional electrode system coupled with anion exchange membrane wastewater treatment system according to claim 7, characterized in that: A circulation blocking control mechanism (15) is provided on the circulation driving support beam (142), each of the circulation driving support beams (142) having two vertically penetrating blocking plate connecting chutes (150), and the circulation blocking control mechanism (15) comprises a blocking control plate (151) slidably connected in the blocking plate connecting chutes (150); The blocking control plate (151) has a plurality of blocking matching holes (1510), and the circulating flow driving plate (140) has a plurality of circulating flow pressure relief holes (1401); A lifting fixed cylinder (152) with an opening facing upward is fixed on the top of the circulation driving support beam (142), a lifting sliding cylinder (153) with an opening facing downward is slidably connected inside the lifting fixed cylinder (152), and the top of the lifting sliding cylinder (153) is fixedly connected to the upper end of the blocking control plate (151); A lifting drive rod (154) for driving the lifting sliding cylinder (153) to move upward and downward is provided in the lifting fixed cylinder (152).

9. A wastewater treatment method using a three-dimensional electrode system coupled with an anion exchange membrane, based on a wastewater treatment system using a three-dimensional electrode system coupled with an anion exchange membrane according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Wastewater pretreatment: First, the wastewater to be treated is pumped into the grid-type filter tank (11) of the pretreatment mechanism (10) by a peristaltic pump, and the wastewater is filtered and intercepted by using multiple mechanical grids; The wastewater filtered and intercepted by the grid filter tank (11) is then pumped into the pretreatment regulating tank (12) by a peristaltic pump, the wastewater is regulated in the pretreatment regulating tank (12), and large particles of inorganic impurities in the wastewater are removed by the grid filter tank (11) and the pretreatment regulating tank (12); S2. Three-dimensional electrolysis treatment of wastewater: The wastewater after water quality adjustment is transported to the biological filter housing (21) by using a decentralized water inlet mechanism (13); the wastewater passes through the initial input space (201) and the supporting layer accommodation space (202) from bottom to top and then enters the three-dimensional electrolysis space (203); The three-dimensional electrode anode plate (24) and the three-dimensional electrode cathode plate (25) are electrically connected to the positive electrode and the negative electrode of the three-dimensional electrolysis power source (200) respectively; The distance between the three-dimensional electrode anode plate (24) and the three-dimensional electrode cathode plate (25) is 1-5 cm, and the current density between the three-dimensional electrode anode plate (24) and the three-dimensional electrode cathode plate (25) is 2-10 A / m 2 ; Under the action of the microcurrent of the three-dimensional electrode system, the facultative denitrifying bacteria enriched on the three-dimensional electrode composite filler (270) utilize the nitrate nitrogen and organic matter in the return wastewater to promote denitrification, thereby promoting the removal of nitrate nitrogen in the wastewater; The filling rate of the three-dimensional electrode composite filler (270) is 60% to 80% V1 / V0, where V1 is the filling volume of the three-dimensional electrode composite filler (270), and V0 is the volume of the three-dimensional electrolytic space (203); At the same time, the nitrate nitrogen with a high concentration in the return wastewater enters the anode biological chamber (204) through the anion exchange membrane (230) in the cathode biological chamber (205) and is reduced to nitrogen gas in the anode biological chamber (204); The wastewater is treated inside the three-dimensional electrolysis space (203) for 2 to 4 hours; S3, wastewater electrolysis MBBR treatment: Using a liquid delivery pump on an electrolysis mechanism input pipe (36), the treated wastewater in the three-dimensional electrolysis space (203) is delivered to the inner shell (22) of the biofilter to continue electrolytic MBBR treatment; The microbial electrolysis anode plate (34) and the microbial electrolysis cathode plate (35) are electrically connected to the positive electrode and the negative electrode of the MBBR power supply (300) respectively; The distance between the microbial electrolysis anode plate (34) and the microbial electrolysis cathode plate (35) is 1 to 5 cm, and the current density between the microbial electrolysis anode plate (34) and the microbial electrolysis cathode plate (35) is 2 to 10 A / m 2 ; An air conveyor is used to aerate the wastewater inside the inner shell (22) of the biological filter tank through a pipeline, and air enters the wastewater to form small bubbles and move from bottom to top, and the air bubbles are in full contact with the wastewater to maintain the amount of dissolved oxygen in the wastewater; Under the action of electrochemical promotion, a large amount of biofilm grows on the fluidized filler (32) after aerobic aeration. When wastewater flows through and contacts the fluidized filler (32), the strong oxidation effect of the high-concentration active microorganisms enriched on the fluidized filler (32) and the bio-electro-flocculation and bio-oxidation effect of the microorganisms on the surface of the fluidized filler (32) are utilized to efficiently remove organic matter and ammonia nitrogen in the wastewater. The filling rate of the fluidized filler (32) is 20% to 45% V1 / V0, V1 is the filling volume of the fluidized filler (32), and V0 is the volume inside the biological filter tank inner shell (22); The wastewater is treated inside the biofilter inner shell (22) for 6 to 10 hours; The dissolved oxygen of the wastewater inside the biofilter inner shell (22) is controlled at 3-4 mg / L; S4. Wastewater return enhanced treatment: The wastewater treated by the electrolytic MBBR is returned to the cathode biological chamber (205) in the three-dimensional electrolytic space (203) through the return pipe. The returned wastewater is rich in nitrate nitrogen. On the one hand, under the action of the microcurrent of the three-dimensional electrode system, the denitrification effect is significantly enhanced. On the other hand, the nitrate nitrogen enters the anode biological chamber (204) through the anion exchange membrane (230) in the cathode biological chamber (205) and is reduced to nitrogen gas at the three-dimensional electrode anode plate (24) in the anode biological chamber (204). The denitrification process is enhanced under the synergistic action of microbiology and electrochemistry. S5, Circulation Reflux Treatment: The proportion of wastewater flowing back from the biological filter inner shell (22) to the three-dimensional electrolysis space (203) is 100% to 300% of the total volume of the wastewater; By reflux, the nitrification and denitrification processes are promoted to remove nitrogen from the wastewater, thus completing the wastewater treatment.

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