Water treatment device and method based on micro-oxygen electrolysis ion exchange biological filter

Abstract

The invention discloses a water treatment device and method based on a micro-oxygen electrolysis ion exchange biofilter, comprising a pretreatment mechanism, a micro-oxygen electrolysis biofilter and an aerated biofilter connected to the pretreatment mechanism; the pretreatment mechanism comprises a regulating tank and a dephosphorization tank which are connected and arranged; the micro-oxygen electrolysis biofilter comprises a micro-oxygen electrolysis cell outer shell and a micro-oxygen electrolysis cell inner shell; in the invention, wastewater undergoes a short-range nitrification and denitrification process under micro-oxygen conditions in a micro-oxygen electrolysis cathode chamber, and a part of the accumulated nitrite nitrogen enters a micro-oxygen electrolysis anode chamber through an anion exchange membrane and is reduced to nitrogen, and a part undergoes a short-range denitrification process and becomes nitrogen; at the same time, the reflux wastewater is rich in nitrate nitrogen, and high-concentration nitrate nitrogen and nitrite nitrogen enter a micro-oxygen electrolysis anode chamber through an anion exchange membrane in the micro-oxygen electrolysis cathode chamber and are reduced to nitrogen in the micro-oxygen electrolysis anode chamber; the process strengthens the denitrification process under the synergistic effect of microbiology and electrochemistry.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater purification and treatment, and in particular to a water treatment device and method based on a micro-oxygen electrolysis ion exchange biofilter. Background Art

[0002] As a common wastewater treatment process, aerated biological filter has the advantages of high pollutant removal efficiency, small footprint, and low sludge production. The main working principle of aerated biological filter is to utilize the interception, filtration and adsorption of the filter matrix, as well as the metabolism of microorganisms on the biofilm and the predation of metazoans. Due to the different and uneven aeration positions of the reactor, there are anoxic and aerobic zones inside the reactor, which can achieve nitrification and denitrification, thereby achieving the purpose of removing organic matter and denitrification in wastewater. However, the microbial activity in the aerated biological filter is low, the anoxic denitrification effect is not significant, and the denitrification efficiency needs to be further enhanced; in addition, due to the lack of a strict anaerobic zone in the aerated biological filter, the phosphorus removal effect is relatively low, and it is urgent to further enhance the pollutant removal efficiency of the aerated biological filter. Summary of the invention

[0003] The purpose of the present invention is to provide a water treatment device and method based on a micro-oxygen electrolytic ion exchange biofilter to solve the problems of insufficient denitrification efficiency and low phosphorus removal efficiency in the conventional aerated biofilter in the prior art.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The water treatment device based on the micro-oxygen electrolysis ion exchange biofilter comprises a pretreatment mechanism, a micro-oxygen electrolysis biofilter and an aerated biofilter connected to the pretreatment mechanism; the pretreatment mechanism comprises a regulating tank and a dephosphorization tank which are arranged in communication; the micro-oxygen electrolysis biofilter comprises a micro-oxygen electrolysis cell outer shell with an opening facing upward and a micro-oxygen electrolysis cell inner shell which is fixed in the micro-oxygen electrolysis cell outer shell and has an opening facing upward; a supporting partition lower plate and a supporting partition upper plate are fixed in the micro-oxygen electrolysis cell outer shell, an initial input space is formed between the lower side of the supporting partition lower plate and the inner bottom of the micro-oxygen electrolysis cell outer shell, and a supporting layer space is formed between the supporting partition lower plate and the supporting partition upper plate; the supporting layer space is filled with a first supporting layer filler, and the first supporting layer filler is 1-2 cm pebbles; a micro-oxygen electrolysis treatment space is formed between the inner side wall of the micro-oxygen electrolysis cell outer shell, the outer side wall of the micro-oxygen electrolysis cell inner shell and the upper side of the supporting partition upper plate;

[0006] The micro-oxygen electrolysis treatment space is filled with a first filler; a plurality of horizontally placed first stratified baffles are fixed in the micro-oxygen electrolysis treatment space, and a micro-oxygen electrolysis stratified space is formed between two adjacent first stratified baffles; an exchange membrane fixing ring coaxially arranged with the micro-oxygen electrolysis cell shell is fixed on the lower side of the first stratified baffle, and the exchange membrane fixing ring is provided with a plurality of exchange membrane installation grooves radially penetrating along the micro-oxygen electrolysis cell shell, and an anion exchange membrane is fixed in the exchange membrane installation groove; a plurality of micro-oxygen electrolysis anode plates and micro-oxygen electrolysis cathode plates are arranged in each micro-oxygen electrolysis stratified space; the micro-oxygen electrolysis anode plates and the micro-oxygen electrolysis cathode plates are respectively connected to the first The positive electrode and the negative electrode of the power supply are electrically connected; the anion exchange membrane separates the micro-oxygen electrolysis stratified space into a micro-oxygen electrolysis anode chamber and a micro-oxygen electrolysis cathode chamber; the micro-oxygen electrolysis anode plate is located in the micro-oxygen electrolysis anode chamber and is fixedly connected to the inner wall of the micro-oxygen electrolysis cell shell, and the micro-oxygen electrolysis cathode plate is located in the micro-oxygen electrolysis cathode chamber and is fixedly connected to the outer wall of the micro-oxygen electrolysis cell inner shell; the aerated biological filter comprises an aerated biological filter support column fixed in the inner shell of the micro-oxygen electrolysis cell and extending vertically, an aeration input partition is fixed in the inner shell of the micro-oxygen electrolysis cell, and an aeration biological filter input space is formed between the aeration input partition and the bottom of the inner shell of the micro-oxygen electrolysis cell;

[0007] An aerated biological filter treatment space is formed in the inner shell of the micro-aerobic electrolysis cell above the aeration input partition; an aerated biological treatment space is formed in the inner shell of the micro-aerobic electrolysis cell above the aeration input partition; the aerated biological treatment space is filled with a second filler; a plurality of horizontally arranged second layered partitions are fixed in the aerated biological treatment space, and an aerated biological layered treatment space is formed between two adjacent second layered partitions; an aerated biological support layer is formed between the upper side of the aeration input partition and the lowest second layered partition; the aerated biological support layer is filled with a second support layer filler, and the second support layer filler is 1-2 cm pebbles.

[0008] Preferably, the dephosphorization tank is connected to the interior of the micro-aerobic electrolytic cell shell through a distributed conveying mechanism, the distributed conveying mechanism includes a plurality of distributed water inlet connecting shells fixed to the bottom of the micro-aerobic electrolytic cell shell, the bottom of the micro-aerobic electrolytic cell shell has a plurality of distributed water inlet through holes so that the initial input space is connected to the interior of the distributed water inlet connecting shell; a distributed water inlet input pipe connected to the interior of the distributed water inlet connecting shell is fixed to the outside of the distributed water inlet connecting shell, and the other end of the distributed water inlet input pipe is connected to the dephosphorization tank.

[0009] Description: The decentralized conveying mechanism can make the wastewater input into the micro-oxygen electrolysis treatment space softer and more uniform, avoiding a large impact force when the wastewater is input and avoiding damage to the biofilm.

[0010] Preferably, a circulating stirring mechanism is provided in the micro-oxygen electrolysis stratified space, and the circulating stirring mechanism comprises an arc-shaped support slide rail fixed at the bottom of the first stratified partition, a circulating stirring support slider is slidably connected to the arc-shaped support slide rail, and a circulating stirring driving plate is fixed to the circulating stirring support slider.

[0011] Description: The wastewater in each micro-oxygen electrolysis stratification space is stirred by a circulating stirring mechanism so that the wastewater is fully in contact with the microorganisms on the first filler.

[0012] Preferably, a volume partitioning mechanism is provided in the micro-oxygen electrolysis treatment space in the micro-oxygen electrolysis shell, and the volume partitioning mechanism includes a plurality of volume partitioning baffles fixed in the micro-oxygen electrolysis stratified space and extending along the radial plane of the micro-oxygen electrolysis shell; a volume partitioning matching plate is slidably connected to the side of the volume partitioning baffle, and the volume partitioning matching plate slides radially along the micro-oxygen electrolysis shell; a plurality of adjacent flow holes are provided on the volume partitioning baffle along its two sides, and a plurality of adjacent flow matching holes are provided on the volume partitioning matching plate along its two sides; a partitioning drive fixed cylinder extending radially and open at one end is fixed to the inner side wall of the micro-oxygen electrolysis cell shell, a partitioning drive sliding cylinder is slidably connected in the partitioning drive fixed cylinder, and the outer end of the partitioning drive sliding cylinder is fixedly connected to the volume partition matching plate; a partitioning drive telescopic rod for driving the partitioning drive sliding cylinder to move is provided in the partitioning drive fixed cylinder.

[0013] Description: The micro-oxygen electrolysis treatment space is divided into multiple independent treatment spaces along the radial direction of the micro-oxygen electrolysis cell shell by using each volume partitioning barrier plate in the volume partitioning mechanism, and the connectivity of each independent treatment space can be controlled to maintain a suitable hydraulic retention time, which can enhance the filter's adaptability to water volume shock loads and ensure the stability of the treatment effect.

[0014] Preferably, a layered opening and closing mechanism is provided on the first layered partition, and the layered opening and closing mechanism includes a layered opening and closing ring plate rotatably connected to the upper side of the first layered partition, and the layered opening and closing ring plate has a plurality of vertically through opening and closing flow holes, and the first layered partition has a plurality of layered flow holes.

[0015] Description: The layered opening and closing mechanism is used to control the connection state of two adjacent micro-oxygen electrolysis layered spaces in the vertical direction. The layered filter tank design is adopted to design the micro-oxygen electrolysis treatment space into a multi-layer structure. Each layer has different functions and microbial communities. The lower layer can mainly carry out the preliminary decomposition of organic matter and the filtration of suspended matter, the middle layer focuses on nitrification reaction, and the upper layer carries out denitrification reaction. This layered structure can enable different biochemical reactions to take place in the most suitable environment, thereby improving the treatment efficiency.

[0016] Preferably, the input space of the aerated biological filter is connected to the initial input space through a plurality of denitrification return pipes, and the denitrification return pipes are provided with a return control valve; the denitrification return pipes are provided with a liquid delivery pump for returning the wastewater in the aerated biological treatment space to the micro-aerobic electrolysis treatment space; a plurality of transfer and delivery pipes are fixed on the side wall of the inner shell of the micro-aerobic electrolysis tank, one end of the transfer and delivery pipes is arranged along the radial extension of the outer shell of the micro-aerobic electrolysis tank, and the other end of the transfer and delivery pipes extends to the input space of the aerated biological filter; a plurality of vertically extending transfer and delivery branch pipes are fixed to the lower side of the portion of the transfer and delivery pipe in the outer shell of the micro-aerobic electrolysis tank.

[0017] Description: The wastewater after aeration biological treatment re-enters each micro-aerobic electrolysis stratification space through the denitrification return pipe. The wastewater undergoes a short-range denitrification process under the micro-aerobic conditions of the micro-aerobic electrolysis cathode chamber, and nitrite nitrogen accumulates. At the same time, the reflowing wastewater is rich in nitrate nitrogen. High-concentration nitrate nitrogen and nitrite nitrogen enter the micro-aerobic electrolysis anode chamber through the anion exchange membrane in the micro-aerobic electrolysis cathode chamber, and are reduced to nitrogen gas in the micro-aerobic electrolysis anode chamber. This process strengthens the denitrification process under the synergistic effect of microbiology and electrochemistry, and the high-concentration nitrate contained in the reflowing wastewater provides an electron acceptor, thereby accelerating the nitrate reduction process.

[0018] Preferably, multiple micro-nano aeration mechanisms are arranged in both the initial input space and the aerated biological filter input space, and the micro-nano aeration mechanism comprises an aeration generating tube sealed at both ends, an aeration pressurizing piston is slidably connected in the aeration generating tube, and the aeration pressurizing piston divides the aeration generating tube into an aeration pressurizing space and an aeration driving space; an aeration water inlet pipe connected to the aeration pressurizing space is fixed on the outside of the aeration generating tube, and an aeration water inlet control valve is provided on the aeration water inlet pipe; an air input pipe connected to the inside of the aeration generating tube is fixed on the outside of the aeration generating tube, and an air input control valve is provided on the air input pipe; An aeration external discharge pipe connected to the aeration pressurization space is fixed on the outside of the pipe, and a plurality of aeration expanders are fixed on the aeration external discharge pipe; an aeration external discharge control valve is provided on the aeration external discharge pipe; an aeration drive telescopic rod for driving the aeration pressurization piston to move is fixed in the aeration drive space; the aeration expander includes a trumpet-shaped aeration expander shell connected to the aeration external discharge pipe, the smaller end of the aeration expander shell is connected to the aeration external discharge pipe, an aeration dispersion baffle is fixed in the aeration expander shell, the aeration dispersion baffle is a honeycomb plate with hollowed-out sides, and an aeration diffusion net is fixed on the larger end of the aeration expander shell.

[0019] Description: The microbubbles produced by the micro-nano aeration mechanism have the characteristics of large specific surface area and long residence time in water, which can improve the oxygen transfer efficiency, so that microorganisms can more fully utilize oxygen for metabolic activities and enhance the ability to decompose pollutants.

[0020] Preferably, a variable volume mechanism for the aerated biological filter is provided on the aerated biological filter support column, and the variable volume mechanism for the aerated biological filter includes a variable volume support plate connected to the top of the aerated biological filter support column and arranged horizontally, and a plurality of variable volume filling shells are fixed to the lower side of the variable volume support plate; the aerated biological filter support column is a hollow structure with an opening facing upward, and a variable volume lifting cylinder with an opening facing downward is slidably connected inside the aerated biological filter support column, and the variable volume support plate is fixedly connected to the top of the variable volume lifting cylinder; a variable volume driving rod for driving the variable volume lifting cylinder to move up and down is provided inside the aerated biological filter support column.

[0021] Description: The volume of the aerated biological filter treatment space is adjusted by using the variable volume mechanism of the aerated biological filter. Under the premise of ensuring that the wastewater can fully contact with the second filler, the volume that meets the actual situation can achieve better wastewater treatment effect.

[0022] Preferably, a tail treatment mechanism is provided in communication with the aerated biological filter treatment space, and the tail treatment mechanism comprises a tail treatment holding tank, in which a plurality of horizontally placed graded filtration support plates are fixed, and the graded filtration support plates are provided with a plurality of vertically penetrating filter element fixing holes, and a vertically penetrating filter element holding cylinder is fixed in the filter element fixing holes, and a filter element sealing plate is fixed at each of the upper and lower ends of the filter element holding cylinder, and the filter element sealing plate is a porous hollow structure with two sides communicating; the filter element holding cylinder is filled with activated carbon; a tail is passed through the lower end of the interior of the tail treatment holding tank The treatment water inlet pipe is connected with the treatment space of the aerated biological filter tank, and a liquid delivery pump is arranged on the tail treatment water inlet pipe; a plurality of tail treatment drainage pipes connected with the interior are fixed to the upper end of the outer side of the tail treatment holding tank; a vertically extending tail stirring shaft is rotatably connected to the bottom of the tail treatment holding tank, a plurality of tail stirring blades are fixed on the tail stirring shaft, a stirring drive holding shell is fixed at the lower end of the tail treatment holding tank, the lower end of the tail stirring shaft extends into the stirring drive holding shell, and a tail stirring drive motor for driving the tail stirring shaft to rotate is fixed in the stirring drive holding shell.

[0023] Description: Utilize the filtering effect of the tail treatment mechanism to further remove residual organic matter, heavy metal ions and microorganisms in the water and improve the effluent quality.

[0024] Preferably, the water treatment method based on the micro-oxygen electrolysis ion exchange biofilter, based on the above-mentioned water treatment device based on the micro-oxygen electrolysis ion exchange biofilter, comprises the following steps:

[0025] S1. Wastewater pretreatment:

[0026] The wastewater to be treated is now transported to the regulating tank to remove most of the suspended particles; the hydraulic retention time of the regulating tank is 3 to 6 hours; the wastewater in the regulating tank is then transported to the dephosphorization tank by a delivery pump to remove particulate phosphorus; a dephosphorization agent is added to the dephosphorization tank, and the dephosphorization agent includes a combination of polyaluminium chloride (PAC) and polyacrylamide (PAM) in a mass ratio of 2:1, and the dosage is 1 to 3 mg / L;

[0027] S2. Wastewater is treated by micro-oxygen electrolysis:

[0028] The wastewater in the dephosphorization tank is transported to the initial input space by a distributed transport mechanism, and a liquid transport pump is provided on the distributed water inlet input pipe, and the wastewater in the dephosphorization tank is first transported to the initial input space by the liquid transport pump; the pretreated wastewater is first transported to the initial input space, and after entering the initial input space, the wastewater flows from bottom to top and sequentially passes through the supporting layer space and each micro-oxygen electrolysis stratified space; the dissolved oxygen content of the wastewater in the micro-oxygen electrolysis treatment space is controlled to be 0.5-1.5 mg / L; the hydraulic retention time of the wastewater in the micro-oxygen electrolysis treatment space is 1-3 hours; the micro-oxygen electrolysis anode plate and the micro-oxygen electrolysis cathode plate are electrically connected to the positive electrode and the negative electrode of the first power supply respectively; the interval between the micro-oxygen electrolysis anode plate and the micro-oxygen electrolysis cathode plate is 1-2 cm, and the current density applied by the first power supply is 2-10 A / m 2 ; By applying a moderate current under micro-aerobic conditions, based on the electrochemical action under micro-aerobic conditions, the activity of microorganisms on the first filler is greatly improved, the enrichment of functional bacteria is enhanced, additional electron donors are provided and the electron transport chain is improved, the metabolic activity of microorganisms is promoted, and the degradation and denitrification process of organic matter and the short-range nitrification and denitrification process are accelerated; the wastewater is mainly used to remove total nitrogen in the micro-aerobic electrolysis treatment space; the first filler is ceramsite, and its filling rate is 60%~80%V / V1, where V is the filling volume of the first filler, and V1 is the volume of the micro-aerobic electrolysis treatment space;

[0029] S3. Wastewater is treated by aeration and biological treatment:

[0030] The wastewater treated by micro-oxygen electrolysis is transported to the input space of the aerated biological filter. After entering the input space of the aerated biological filter, the wastewater flows from bottom to top and passes through the aerated biological support layer and each aerated biological stratified treatment space in turn; the dissolved oxygen concentration of the wastewater in the aerated biological filter treatment space is controlled at 3.0~4.0mg / L; the hydraulic retention time of the wastewater in the aerated biological filter treatment space is 5~6 hours; the second filler is zeolite, and the filling rate of the second filler is 60%~80%V2 / V3, V2 is the filling volume of the second filler, and V3 is the volume of the aerated biological filter treatment space; a microenvironment with an aerobic external surface and anoxic internal environment is formed around the second filler in the aerated biological filter treatment space, and the microorganisms attached to the second filler are used to achieve synchronous nitrification and denitrification, thereby improving the removal efficiency of organic matter and nitrogen;

[0031] S4, wastewater reflux treatment:

[0032] The wastewater after aeration biological treatment enters the initial input space, and flows from bottom to top with the water flow, passing through the support layer space and each micro-aerobic electrolysis layer space in turn; the wastewater undergoes a short-range nitrification and denitrification process under the micro-aerobic conditions of the micro-aerobic electrolysis cathode chamber, and nitrite nitrogen accumulates. A part of the accumulated nitrite nitrogen enters the micro-aerobic electrolysis anode chamber through the anion exchange membrane and is reduced to nitrogen gas, and a part of the nitrite nitrogen directly undergoes a short-range denitrification process to become nitrogen gas. At the same time, the reflux wastewater is rich in nitrate nitrogen. The high-concentration nitrate nitrogen and nitrite nitrogen enter the micro-aerobic electrolysis anode chamber through the anion exchange membrane in the micro-aerobic electrolysis cathode chamber and are reduced to nitrogen gas in the micro-aerobic electrolysis anode chamber. This process strengthens the denitrification process under the synergistic effect of microbiology and electrochemistry.

[0033] S5. Wastewater recycling treatment:

[0034] The wastewater in the aerated biological filter treatment space enters the micro-aerobic electrolysis treatment space and then undergoes circulation treatment in the micro-aerobic electrolysis treatment space; the reflux ratio of the wastewater is 100%~250%;

[0035] S6, wastewater is treated by tail filtration:

[0036] The upper layer of the aerated biological filter treatment space is the clear water area; the tail treatment water inlet pipe is provided with a liquid delivery pump, and the liquid delivery pump is used to deliver the treated wastewater in the clear water area in the aerated biological filter treatment space to the bottom of the tail treatment holding tank, and the wastewater then flows from bottom to top in the tail treatment holding tank; during the flow process, the wastewater sequentially passes through a plurality of filter element holding cylinders on each graded filtration support plate, and the filtering effect of the activated carbon in the filter element holding cylinder is used to further remove the residual organic matter, heavy metal ions and microorganisms in the water, thereby improving the effluent water quality; the wastewater after the tail filtration treatment is finally discharged from each tail treatment drainage pipe; in this process, the tail stirring drive motor drives the tail stirring shaft to rotate through the belt drive, and the tail stirring shaft drives a plurality of tail stirring blades to stir the wastewater entering the tail treatment holding tank.

[0037] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0038] 1. The present invention has reasonable structural design, small footprint and simple operation;

[0039] 2. The present invention is easy to operate. It utilizes the micro-current electrolysis under micro-oxygen conditions to strengthen the biological metabolic activity of microorganisms on the first filler in the micro-oxygen electrolysis biofilter, provide additional electron donors and improve the electron transport chain, thereby strengthening the removal efficiency of organic matter and nitrogen in the process. Nitrate nitrogen and nitrite nitrogen enter the micro-oxygen electrolysis anode chamber through the anion exchange membrane in the micro-oxygen electrolysis cathode chamber and are reduced to nitrogen gas in the micro-oxygen electrolysis anode chamber, thereby synergistically strengthening the denitrification process.

[0040] 3. The present invention utilizes the coupling method of the micro-oxygen electrolytic biofilter and the aerated biofilter to improve the overall ability of the system to resist high impact loads;

[0041] 4. The technical solution of the present invention is used for wastewater treatment, which produces a small amount of sludge and has low operation and maintenance costs;

[0042] 5. The micro-oxygen electrolysis biofilter of the present invention adopts a layered filter design, and the micro-oxygen electrolysis treatment space is designed as a multi-layer structure, each layer has different functions and microbial communities, the lower layer can mainly perform preliminary decomposition of organic matter and filtration of suspended matter, the middle layer focuses on nitrification, and the upper layer performs denitrification. This layered structure allows different biochemical reactions to be carried out in the most suitable environment, thereby improving the treatment efficiency;

[0043] 6. The micro-oxygen electrolytic biofilter and aerated biofilter of the present invention are both variable volume filters, which can adjust the volume according to the changes in the influent flow rate and water quality. When the influent water quality is stable but the water volume fluctuates greatly, the volume can be changed to maintain a suitable hydraulic retention time, thereby enhancing the filter's adaptability to water volume shock loads and ensuring the stability of the treatment effect.

[0044] 7. The present invention adopts a micro-nano aeration mechanism. The microbubbles have the characteristics of large specific surface area and long residence time in water, which can improve the oxygen transfer efficiency, so that microorganisms can more fully utilize oxygen for metabolic activities and enhance the ability to decompose pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a front view of the present invention; Figure 2 yes Figure 1 A top view of Figure 3 yes Figure 1 Bottom view of Figure 4 is a top view of the exchange membrane fixing ring of the present invention; Figure 5 is a top view of the volume separation mechanism of the present invention; Figure 6 is a top view of the volume partitioning barrier of the present invention; Figure 7 It is a structural schematic diagram of the layered opening and closing mechanism of the present invention; Figure 8 It is a schematic diagram of the structure of the transfer and delivery pipe of the present invention; Fig. 9 It is a structural schematic diagram of the micro-nano aeration mechanism of the present invention; Fig.10 It is a structural schematic diagram of the aeration expander of the present invention; Fig.11 It is a structural schematic diagram of the volume variable mechanism of the aerated biological filter tank of the present invention; Fig.12 is a bottom view of the variable volume support plate of the present invention; Fig.13 It is a structural schematic diagram of the tail processing mechanism of the present invention; Fig.14 It is a schematic structural diagram of the filter element receiving tube of the present invention; Fig.15 It is a schematic diagram of the mechanism of the water treatment method of the present invention; Fig.16 This is a comparison chart of COD removal effects between the water treatment method of the present invention and the traditional process; Fig.17 This is a comparison chart of TN removal effects between the water treatment method of the present invention and the traditional process; Fig.18 The water treatment method of the present invention is different from the traditional process NH4 + -N removal effect comparison chart; Fig.19 It is a comparison chart of TP removal effect between the water treatment method of the present invention and the traditional process.

[0046] In the figure, 10-pretreatment mechanism, 11-regulating tank, 12-dephosphorization tank, 13-distributed conveying mechanism, 130-distributed water inlet through hole, 131-distributed water inlet connecting shell, 132-distributed water inlet input pipe, 20-micro-oxygen electrolysis biofilter, 201-initial input space, 2001-first filler, 202-supporting layer space, 203-micro-oxygen electrolysis treatment space, 2030-micro-oxygen electrolysis stratified space, 204-first supporting layer filler, 21-micro-oxygen electrolysis cell shell, 211-supporting partition lower plate, 212-supporting partition upper plate, 213-first stratified partition, 2130-stratified circulation hole, 2031-micro-oxygen electrolysis anode chamber, 2032-micro-oxygen electrolysis cathode chamber, 22-micro-oxygen electrolysis cell inner shell, 23- Exchange membrane fixing ring, 231-exchange membrane installation groove, 230-anion exchange membrane, 241-micro oxygen electrolysis anode plate, 242-micro oxygen electrolysis cathode plate, 240-first power supply, 26-circulation stirring mechanism, 260-circulation stirring drive plate, 261-arc support slide rail, 262-circulation stirring support slider, 27-volume separation mechanism, 271-volume separation blocking plate, 2710-adjacent flow hole, 272-volume separation matching plate, 2720-adjacent flow matching hole, 273-separation drive fixing cylinder, 274-separation drive sliding cylinder, 275-separation drive telescopic rod, 28-layered opening and closing mechanism, 281-layered opening and closing ring plate, 282-opening and closing flow hole, 30-aerated biological filter, 3001-first Second filler, 301-aerated biological filter input space, 302-aerated biological support layer, 303-aerated biological filter treatment space, 3030-aerated biological stratified treatment space, 304-second support layer filler, 31-aerated biological filter support column, 311-aeration input baffle, 312-second stratified baffle, 33-transfer and delivery pipe, 331-transfer and delivery branch pipe, 34-denitrification reflux pipe, 341-reflux control valve, 41-micro-nano aeration mechanism, 411-aeration generation pipe, 4111-aeration pressurization space, 4112-aeration drive space, 412-aeration pressurization piston, 413-aeration water inlet pipe, 4130-aeration water inlet control valve, 414-air input pipe, 4140-air input control valve, 415-aeration vent pipe, 4150-aeration vent control valve, 416-aeration expander, 4161-aeration expander shell, 417-aeration dispersion baffle, 418-aeration diffusion net, 419-aeration drive telescopic rod, 42-aeration biological filter volume variable mechanism, 421-volume variable support plate, 422-volume variable filling shell, 423-volume variable lifting cylinder, 424-volume variable driving rod, 50-tail treatment mechanism, 51-tail treatment holding tank, 511-tail treatment water inlet pipe, 512-tail treatment drain pipe, 52-grading filtration support plate, 521-filter element fixing hole, 53-filter element holding cylinder, 530-filter element sealing plate, 54-tail stirring shaft, 541-tail stirring blade,55-stirring drive housing, 551-rear stirring drive motor. DETAILED DESCRIPTION

[0047] Combine the following Figure 1-Figure 6 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:

[0048] Water treatment devices based on micro-aerobic electrolysis ion exchange biofilters, such as Figure 1 , Figure 2 As shown, it includes a pretreatment mechanism 10, a micro-oxygen electrolytic biofilter 20 connected to the pretreatment mechanism 10, and an aerated biofilter 30; Figure 2 As shown, the pretreatment mechanism 10 includes a regulating tank 11 and a dephosphorization tank 12 which are connected to each other; both the regulating tank 11 and the dephosphorization tank 12 are provided with a stirrer of the prior art, and the dephosphorization tank 12 is provided with a reagent dosing device of the prior art;

[0049] like Figure 1 As shown, the micro-oxygen electrolysis biofilter 20 includes a micro-oxygen electrolysis cell outer shell 21 with an opening facing upward and a micro-oxygen electrolysis cell inner shell 22 fixed in the micro-oxygen electrolysis cell outer shell 21 and with an opening facing upward; both the micro-oxygen electrolysis cell outer shell 21 and the micro-oxygen electrolysis cell inner shell 22 are cylindrical shell structures with an opening facing upward; Figure 1 As shown, a supporting partition lower plate 211 and a supporting partition upper plate 212 are fixed in the micro-oxygen electrolysis cell housing 21, an initial input space 201 is formed between the lower side of the supporting partition lower plate 211 and the bottom of the micro-oxygen electrolysis cell housing 21, and a supporting layer space 202 is formed between the supporting partition lower plate 211 and the supporting partition upper plate 212; the supporting layer space 202 is filled with a first supporting layer filler 204, and the first supporting layer filler 204 is 1~2cm pebbles; the supporting layer The backwashing area is above the space 202; a micro-oxygen electrolysis treatment space 203 is formed between the inner wall of the micro-oxygen electrolysis cell shell 21, the outer wall of the micro-oxygen electrolysis cell inner shell 22 and the upper side of the supporting partition upper plate 212; the micro-oxygen electrolysis treatment space 203 is filled with a first filler 2001; a plurality of horizontally placed first layered baffles 213 are fixed in the micro-oxygen electrolysis treatment space 203, and a micro-oxygen electrolysis layered space 2030 is formed between two adjacent first layered baffles 213;

[0050] like Figure 1 , Figure 4As shown, an exchange membrane fixing ring 23 coaxially arranged with the micro oxygen electrolysis cell housing 21 is fixed to the lower side of the first layered partition 213, and a plurality of exchange membrane installation slots 231 radially extending through the micro oxygen electrolysis cell housing 21 are provided on the exchange membrane fixing ring 23, and an anion exchange membrane 230 is fixed in the exchange membrane installation slots 231; the anion exchange membrane 230 is an anion exchange membrane of the prior art; a plurality of micro oxygen electrolysis anode plates 241 and micro oxygen electrolysis cathode plates 242 are arranged in each micro oxygen electrolysis layered space 2030; the micro oxygen electrolysis anode plates 241 and the micro oxygen electrolysis cathode plates 242 are electrically connected to the positive electrode and the negative electrode of the first power source 240 respectively; the micro oxygen electrolysis anode plates 241 are ruthenium iridium titanium plates, and the micro oxygen electrolysis cathode plates 242 are titanium plates;

[0051] like Figure 4 As shown, the anion exchange membrane 230 separates the micro-oxygen electrolysis stratified space 2030 into a micro-oxygen electrolysis anode chamber 2031 and a micro-oxygen electrolysis cathode chamber 2032; the micro-oxygen electrolysis anode plate 241 is located in the micro-oxygen electrolysis anode chamber 2031 and is fixedly connected to the inner wall of the micro-oxygen electrolysis cell shell 21, and the micro-oxygen electrolysis cathode plate 242 is located in the micro-oxygen electrolysis cathode chamber 2032 and is fixedly connected to the outer wall of the micro-oxygen electrolysis cell inner shell 22; Figure 1 As shown, the aerated biological filter 30 includes an aerated biological filter support column 31 fixed in the micro-aerobic electrolysis tank inner shell 22 and extending vertically, an aeration input baffle 311 is fixed in the micro-aerobic electrolysis tank inner shell 22, and an aeration biological filter input space 301 is formed between the aeration input baffle 311 and the bottom of the micro-aerobic electrolysis tank inner shell 22; an aerated biological filter treatment space 303 is formed above the aeration input baffle 311 in the micro-aerobic electrolysis tank inner shell 22; Figure 2 As shown, the aerated biological filter treatment space 303 is filled with a second filler 3001; a plurality of horizontally arranged second layered baffles 312 are fixed in the aerated biological filter treatment space 303, and an aerated biological layered treatment space 3030 is formed between two adjacent second layered baffles 312; an aerated biological support layer 302 is formed between the upper side of the aeration input baffle 311 and the lowermost second layered baffle 312; the aerated biological support layer 302 is filled with a second support layer filler 304, and the second support layer filler 304 is 1~2 cm pebbles.

[0052] like Figure 1 As shown, the aerated biological filter input space 301 is connected to the initial input space 201 through a plurality of denitrification return pipes 34, and the denitrification return pipes 34 are provided with return control valves 341; the denitrification return pipes 34 are provided with a prior art liquid delivery pump for returning the wastewater in the aerated biological filter treatment space 303 to the micro-oxygen electrolysis treatment space 203;

[0053] like Figure 8As shown, a plurality of transfer and delivery pipes 33 are fixed on the side wall of the inner shell 22 of the micro-aerobic electrolysis cell, one end of the transfer and delivery pipe 33 is arranged along the radial extension of the outer shell 21 of the micro-aerobic electrolysis cell, and the other end of the transfer and delivery pipe 33 extends to the input space 301 of the aerated biological filter; a plurality of vertically extending transfer and delivery branch pipes 331 are fixed to the lower side of the portion of the transfer and delivery pipe 33 in the outer shell 21 of the micro-aerobic electrolysis cell; the transfer and delivery pipe 33 is provided with a liquid delivery pump of the prior art, which is used to deliver the upper wastewater in the micro-aerobic electrolysis treatment space 203 to the input space 301 of the aerated biological filter for further treatment.

[0054] like Figure 1 As shown, multiple micro-nano aeration mechanisms 41 are arranged in the initial input space 201 and the aerated biological filter input space 301. Fig. 9 , Fig.10 As shown, the micro-nano aeration mechanism 41 includes an aeration generating tube 411 sealed at both ends, an aeration pressurizing piston 412 is slidably connected in the aeration generating tube 411, and the aeration pressurizing piston 412 divides the aeration generating tube 411 into an aeration pressurizing space 4111 and an aeration driving space 4112; an aeration water inlet pipe 413 connected to the aeration pressurizing space 4111 is fixed on the outside of the aeration generating tube 411, and an aeration water inlet control valve 4130 is provided on the aeration water inlet pipe 413; an air input pipe 414 connected to the inside of the aeration generating tube 411 is fixed on the outside of the aeration generating tube 411, and an air input control valve 4140 is provided on the air input pipe 414; an aeration vent pipe 415 connected to the aeration pressurizing space 4111 is fixed on the outside of the aeration generating tube 411, and a plurality of aeration expanders 416 are fixed on the aeration vent pipe 415; and an aeration vent control valve 4130 is provided on the aeration vent pipe 415. 150; an aeration drive telescopic rod 419 for driving the aeration pressurizing piston 412 to move is fixed in the aeration drive space 4112, and the aeration drive telescopic rod 419 is an electrically controlled telescopic rod of the prior art, and the outer rod end of the aeration drive telescopic rod 419 is fixedly connected to the inner end of the aeration generating tube 411, and the inner rod end of the aeration drive telescopic rod 419 is fixedly connected to the aeration pressurizing piston 412; the aeration expander 416 includes a trumpet-shaped aeration expander shell 4161 connected to the aeration external discharge pipe 415, the smaller end of the aeration expander shell 4161 is connected to the aeration external discharge pipe 415, an aeration dispersion baffle 417 is fixed in the aeration expander shell 4161, and the aeration dispersion baffle 417 is a honeycomb plate with hollowed-out sides, and an aeration diffusion net 418 is fixed to the larger end of the aeration expander shell 4161; the aeration diffusion net 418 is a 1000-mesh stainless steel metal net.

[0055] like Fig.13As shown, a tail treatment mechanism 50 is connected to the aerated biological filter treatment space 303, and the tail treatment mechanism 50 includes a tail treatment holding tank 51, and a plurality of horizontally placed graded filter support plates 52 are fixed in the tail treatment holding tank 51. The graded filter support plate 52 has a plurality of vertically penetrating filter element fixing holes 521, and a vertically penetrating filter element holding cylinder 53 is fixed in the filter element fixing hole 521, as shown in FIG. Fig.14 As shown, a filter element sealing plate 530 is fixed to each of the upper and lower ends of the filter element accommodating tube 53, and the filter element sealing plate 530 is a porous hollow structure with two sides communicating; the filter element accommodating tube 53 is filled with activated carbon; the lower end of the tail treatment accommodating tank 51 is connected to the aerated biological filter treatment space 303 through a tail treatment water inlet pipe 511, and the tail treatment water inlet pipe 511 is provided with a liquid delivery pump of the prior art; a plurality of tail treatment drainage pipes 512 connected to the interior are fixed to the upper end of the outer side of the tail treatment accommodating tank 51; a vertically extending tail stirring shaft 54 ​​is rotatably connected to the bottom of the tail treatment accommodating tank 51, and a plurality of tail stirring blades 54 are fixed to the tail stirring shaft 54 1. A stirring drive housing shell 55 is fixed at the lower end of the tail treatment housing tank 51, and the lower end of the tail stirring shaft 54 ​​extends into the stirring drive housing shell 55. A tail stirring drive motor 551 for driving the tail stirring shaft 54 ​​to rotate is fixed in the stirring drive housing shell 55; the tail stirring drive motor 551 is a three-phase motor in the prior art, and the tail stirring drive motor 551 drives the tail stirring shaft 54 ​​to rotate through a belt drive; the inner side walls of the micro-oxygen electrolysis treatment space 203 and the aerated biological filter treatment space 303 are fixedly provided with a dissolved oxygen sensor, a pH sensor, an ammonia nitrogen sensor, a residual chlorine sensor, a turbidity sensor, a conductivity sensor and a heavy metal sensor in the prior art. Embodiment 2:

[0056] This embodiment describes a water treatment method based on a micro-oxygen electrolysis ion exchange biofilter. The water treatment device based on a micro-oxygen electrolysis ion exchange biofilter according to Embodiment 1 comprises the following steps:

[0057] S1. Wastewater pretreatment: The wastewater to be treated is now transported to the regulating tank 11 to remove most of the suspended particles; the hydraulic retention time of the regulating tank 11 is 3 hours; the wastewater in the regulating tank 11 is then transported to the dephosphorization tank 12 by a conventional delivery pump to remove particulate phosphorus; a dephosphorization agent is added to the dephosphorization tank 12, the dephosphorization agent includes a combination of polyaluminium chloride PAC and polyacrylamide PAM in a mass ratio of 2:1, and the dosage is 1 mg / L;

[0058] S2. Micro-oxygen electrolysis treatment of wastewater: the pre-treated wastewater is first transported to the initial input space 201. After entering the initial input space 201, the wastewater flows from bottom to top and passes through the supporting layer space 202 and each micro-oxygen electrolysis layered space 2030 in sequence; the dissolved oxygen content of the wastewater in the micro-oxygen electrolysis treatment space 203 is controlled at 0.5 mg / L; the hydraulic retention time of the wastewater in the micro-oxygen electrolysis treatment space 203 is 1 hour; the micro-oxygen electrolysis anode plate 241 and the micro-oxygen electrolysis cathode plate 242 are electrically connected to the positive electrode and the negative electrode of the first power supply 240 respectively; the interval between the micro-oxygen electrolysis anode plate 241 and the micro-oxygen electrolysis cathode plate 242 is 1 cm, and the current density applied by the first power supply 240 is 2A / m 2 ; The backwash gas-water ratio is 25:1; by applying a moderate current under micro-aerobic conditions, based on the electrochemical action under micro-aerobic conditions, the microbial activity on the first filler 2001 is greatly improved, the enrichment of functional bacteria is enhanced, additional electron donors are provided and the electron transport chain is improved, the metabolic activity of microorganisms is promoted, and the degradation and denitrification process of organic matter and the short-range nitrification and denitrification process are accelerated; the wastewater is mainly used to remove total nitrogen in the micro-aerobic electrolysis treatment space 203; the first filler 2001 is ceramsite, and its filling rate is 60%V / V1, where V is the filling volume of the first filler 2001, and V1 is the volume of the micro-aerobic electrolysis treatment space 203;

[0059] S3, wastewater is subjected to aeration biological treatment: the wastewater after micro-oxygen electrolysis treatment is transported to the aerated biological filter input space 301, and after entering the aerated biological filter input space 301, the wastewater flows from bottom to top and passes through the aerated biological support layer 302 and each aerated biological stratified treatment space 3030 in turn; the dissolved oxygen concentration of the wastewater in the aerated biological filter treatment space 303 is controlled at 3.0 mg / L; the hydraulic retention time of the wastewater in the aerated biological filter treatment space 303 is 5 hours; the second filler 3001 is zeolite, and the filling rate of the second filler 3001 is 60% V2 / V3, V2 is the filling volume of the second filler 3001, and V3 is the volume of the aerated biological filter treatment space 303; the backwash air-water ratio is 25:1; the periphery of the second filler 3001 in the aerated biological filter treatment space 303 forms an external surface The microenvironment is aerobic on the surface and anoxic inside, and the microorganisms attached to the second filler 3001 are used to achieve synchronous nitrification and denitrification, thereby improving the removal efficiency of organic matter and nitrogen; the micro-nano aeration mechanism 41 is used to aerate the aerated biological filter treatment space 303 to maintain the oxygen dissolved content of the wastewater in the aerated biological filter treatment space 303; the inner rod of the aeration drive telescopic rod 419 is extended or retracted to drive the aeration pressurization piston 412 to move in the aeration generating pipe 411, thereby changing the volume of the aeration pressurization space 4111; when the inner rod of the aeration drive telescopic rod 419 is retracted, the aeration pressurization piston 412 is driven to move to increase the volume of the aeration pressurization space 4111, and the aeration water inlet control valve 4130 is opened, and the wastewater enters the aeration pressurization space 4111 through the aeration water inlet pipe 413, and then the aeration water inlet control valve 4130 is closed;

[0060] The air input control valve 4140 is opened, and air is input into the aeration pressurization space 4111 by using the air conveyor of the prior art, and the air pressure is controlled at 1.5 bar, and then the air input control valve 4140 is closed; then the inner rod of the aeration drive telescopic rod 419 is extended to drive the aeration pressurization piston 412 to move so that the volume of the aeration pressurization space 4111 is reduced, and the air is forced to dissolve in the wastewater under high pressure, and maintained for 3 minutes; finally, the aeration external discharge control valve 4150 is opened, and the wastewater with a large amount of air dissolved in the aeration pressurization space 4111 enters the aeration external discharge pipe 415 and is discharged into the aeration biological filter treatment space 303 through each aeration expander 416; due to the decompression effect, a large amount of microbubbles will be instantly generated inside the wastewater with a large amount of air dissolved, and the wastewater containing a large amount of microbubbles is discharged into the aeration biological filter treatment space 303 to maintain the oxygen dissolved amount of the wastewater in the aeration biological filter treatment space 303;

[0061] S4, wastewater reflux treatment: the wastewater after aeration biological treatment re-enters the initial input space 201 through the denitrification reflux pipe 34, and flows from bottom to top with the water flow through the support layer space 202 and each micro-oxygen electrolysis layer space 2030 in sequence;

[0062] The wastewater undergoes a short-range nitrification and denitrification process under the micro-oxygen conditions of the micro-oxygen electrolysis cathode chamber 2032, and nitrite nitrogen accumulates. A portion of the accumulated nitrite nitrogen enters the micro-oxygen electrolysis anode chamber 2031 through the anion exchange membrane 230 and is reduced to nitrogen gas, and a portion of the nitrite nitrogen directly undergoes a short-range denitrification process to become nitrogen gas. At the same time, the reflowing wastewater is rich in nitrate nitrogen. High-concentration nitrate nitrogen and nitrite nitrogen enter the micro-oxygen electrolysis anode chamber 2031 through the anion exchange membrane 230 in the micro-oxygen electrolysis cathode chamber 2032, and are reduced to nitrogen gas in the micro-oxygen electrolysis anode chamber 2031. This process strengthens the denitrification process under the synergistic effect of microbiology and electrochemistry; the high-concentration nitrate contained in the reflowing wastewater provides an electron acceptor, thereby accelerating the nitrate reduction process; the micro-oxygen condition has a specific promoting effect on the enrichment of functional bacteria, and the micro-oxygen environment increases the diversity of microorganisms, because different microorganisms can coexist under micro-oxygen conditions according to their different oxygen requirements, thereby strengthening the removal of organic pollutants.

[0063] S5. Wastewater is circulated and refluxed: the wastewater in the aerated biological filter treatment space 303 enters the micro-aerobic electrolysis treatment space 203 through the denitrification reflux pipe 34, and then circulates and treats in the micro-aerobic electrolysis treatment space 203; the reflux ratio of the wastewater is 100%;

[0064] S6, the wastewater is subjected to tail filtration treatment: the upper layer of the aerated biological filter treatment space 303 is the clear water area; the tail treatment water inlet pipe 511 is provided with a liquid delivery pump of the prior art, and the liquid delivery pump is used to deliver the wastewater in the treated clear water area in the aerated biological filter treatment space 303 to the bottom of the tail treatment holding tank 51, and the wastewater then flows from bottom to top in the tail treatment holding tank 51; during the flow process, the wastewater sequentially passes through a plurality of filter element holding cylinders 53 on each graded filtration support plate 52, and the filtering effect of the activated carbon in the filter element holding cylinder 53 is used to further remove the residual organic matter, heavy metal ions and microorganisms in the water, thereby improving the effluent water quality; the wastewater after the tail filtration treatment is finally discharged from each tail treatment drainage pipe 512;

[0065] During this process, the tail stirring drive motor 551 drives the tail stirring shaft 54 ​​to rotate through belt transmission, and the tail stirring shaft 54 ​​drives the multiple tail stirring blades 541 to stir the wastewater entering the tail treatment holding tank 51. Embodiment 3:

[0066] On the basis of Example 1, Figure 1 As shown, the dephosphorization tank 12 is connected to the interior of the micro-oxygen electrolytic cell housing 21 through a distributed conveying mechanism 13. Figure 3As shown, the distributed conveying mechanism 13 includes a plurality of distributed water inlet connecting shells 131 fixed to the bottom of the micro-aerobic electrolysis cell housing 21. The bottom of the micro-aerobic electrolysis cell housing 21 has a plurality of distributed water inlet through holes 130 so that the initial input space 201 is connected with the inside of the distributed water inlet connecting shell 131. A distributed water inlet input pipe 132 connected with the inside of the distributed water inlet connecting shell 131 is fixed to the outside of the distributed water inlet connecting shell 131, and the other end of the distributed water inlet input pipe 132 is connected with the dephosphorization tank 12. Embodiment 4:

[0067] This embodiment records a water treatment method based on a micro-oxygen electrolytic ion exchange biofilter. The water treatment device based on a micro-oxygen electrolytic ion exchange biofilter according to Embodiment 3 is different from Embodiment 2 in that, in step S2, the wastewater in the dephosphorization tank 12 is transported to the initial input space 201 by a distributed transport mechanism 13, and the distributed water inlet input pipe 132 is provided with a liquid transport pump of the prior art. The wastewater in the dephosphorization tank 12 is first transported to the distributed water inlet connecting shell 131 by the liquid transport pump, and the wastewater in the distributed water inlet connecting shell 131 enters the initial input space 201 through a plurality of distributed water inlet through holes 130. Embodiment 5:

[0068] On the basis of Example 3, Figure 7 As shown, a circulating stirring mechanism 26 is provided in the micro-oxygen electrolysis stratified space 2030, and the circulating stirring mechanism 26 includes an arc-shaped support rail 261 fixed at the bottom of the first stratified partition 213, and a circulating stirring support slider 262 is slidably connected to the arc-shaped support rail 261, and a circulating stirring driving plate 260 is fixed to the circulating stirring support slider 262; the circulating stirring driving plate 260 is extended and arranged along the radial plane of the micro-oxygen electrolysis cell housing 21; the circulating stirring support slider 262 is driven by a servo motor in the prior art to move along the arc-shaped support rail 261. Embodiment 6:

[0069] This embodiment describes a water treatment method based on a micro-oxygen electrolysis ion exchange biofilter. The water treatment device based on a micro-oxygen electrolysis ion exchange biofilter according to Embodiment 5 is different from Embodiment 4 in that, in step S2, the wastewater in each micro-oxygen electrolysis stratified space 2030 is stirred by a circulating stirring mechanism 26, so that the wastewater is fully in contact with the microorganisms on the first filler 2001; the arc-shaped support slide 261 is coaxially arranged with the micro-oxygen electrolysis cell housing 21, and the circulating stirring support slider 262 is driven by a servo motor in the prior art to reciprocate along the arc-shaped support slide 261, and the circulating stirring support slider 262 drives the circulating stirring driving plate 260 to move together, that is, the circulating stirring driving plate 260 can reciprocate around the circumference of the micro-oxygen electrolysis cell housing 21; the circulating stirring driving plate 260 is used to drive the wastewater to reciprocate around the circumference of the micro-oxygen electrolysis cell housing 21, so that the wastewater is fully in contact with the microorganisms on the first filler 2001 during the movement. Embodiment 7:

[0070] On the basis of Example 5, Figure 5 , Figure 6 As shown, a volume partitioning mechanism 27 is provided in the micro-oxygen electrolysis treatment space 203 in the micro-oxygen electrolysis cell housing 21. The volume partitioning mechanism 27 includes a plurality of volume partitioning baffles 271 fixed in the micro-oxygen electrolysis layered space 2030 and extending along the radial plane of the micro-oxygen electrolysis cell housing 21; a volume partitioning matching plate 272 is slidably connected to the side of the volume partitioning baffle 271, and the volume partitioning matching plate 272 slides radially along the micro-oxygen electrolysis cell housing 21; the volume partitioning baffle 271 has a plurality of adjacent flow holes 2710 extending along both sides thereof, and the volume partitioning matching plate 272 has a plurality of adjacent flow matching holes 2720 extending along both sides thereof; A partition drive fixed cylinder 273 extending radially and open at one end is fixed to the inner side wall of the oxygen electrolysis cell housing 21, a partition drive sliding cylinder 274 is slidably connected inside the partition drive fixed cylinder 273, and the outer end of the partition drive sliding cylinder 274 is fixedly connected to the volume partition matching plate 272; a partition drive telescopic rod 275 for driving the partition drive sliding cylinder 274 to move is provided inside the partition drive fixed cylinder 273, the partition drive telescopic rod 275 is an electrically controlled telescopic rod of the prior art, the outer rod end of the partition drive telescopic rod 275 is fixedly connected to the partition drive fixed cylinder 273, and the inner rod end of the partition drive telescopic rod 275 is fixedly connected to the partition drive sliding cylinder 274. Embodiment 8:

[0071] This embodiment describes a water treatment method based on a micro-oxygen electrolysis ion exchange biofilter. The water treatment device based on a micro-oxygen electrolysis ion exchange biofilter according to Embodiment 7 is different from Embodiment 6 in that, in step S2, the micro-oxygen electrolysis treatment space 203 is radially divided into a plurality of independent treatment spaces along the micro-oxygen electrolysis cell housing 21 by using each volume partitioning baffle 271 in the volume partitioning mechanism 27, and the connectivity of each independent treatment space can be controlled to maintain a suitable hydraulic retention time, which can enhance the adaptability of the filter to the water volume impact load and ensure the stability of the treatment effect; the extension or retraction of the inner rod of the partition drive telescopic rod 275 can drive the partition drive sliding cylinder 274 together with the volume partitioning mechanism 27 to move the micro-oxygen electrolysis treatment space 203 radially along the micro-oxygen electrolysis cell housing 21. The closing plates 272 slide together along the radial direction of the micro-oxygen electrolysis cell housing 21; the volume separation matching plate 272 and the volume separation blocking plate 271 move relative to each other to control the connectivity between each adjacent flow matching hole 2720 and the adjacent flow hole 2710; the adjacent flow matching holes 2720 and the adjacent flow holes 2710 are staggered and isolated from each other, that is, the two adjacent independent treatment spaces are in a "non-connected" state, and the adjacent flow matching holes 2720 and the adjacent flow holes 2710 are aligned and connected to each other, that is, the two adjacent independent treatment spaces are in a "connected" state; the connectivity of multiple independent treatment spaces is controlled to separate the "volume" actually required for micro-oxygen electrolysis treatment of wastewater, thereby achieving better treatment effect and efficiency. Embodiment 9:

[0072] On the basis of Example 7, Figure 7 As shown, a layered opening and closing mechanism 28 is provided on the first layered partition 213, and the layered opening and closing mechanism 28 includes a layered opening and closing ring plate 281 rotatably connected to the upper side of the first layered partition 213, and the layered opening and closing ring plate 281 has a plurality of vertically penetrating opening and closing flow holes 282, and the first layered partition 213 has a plurality of layered flow holes 2130; the first layered partition 213 and the layered opening and closing ring plate 281 are both horizontally arranged and coaxial with the micro-oxygen electrolysis cell housing 21. The layered opening and closing ring plate 281 is driven by a prior art servo motor fixed on the inner side wall of the micro-oxygen electrolysis cell housing 21 through a gear rack transmission to rotate around the vertical axis of the micro-oxygen electrolysis cell housing 21.

[0073] Embodiment 10: This embodiment describes a water treatment method based on a micro-oxygen electrolysis ion exchange biofilter. The water treatment device based on a micro-oxygen electrolysis ion exchange biofilter based on Embodiment 9 is different from Embodiment 8 in that, in step S2, the layered opening and closing mechanism 28 is used to control the connection state of two adjacent micro-oxygen electrolysis layered spaces 2030 in the vertical direction; the servo motor of the prior art fixed on the inner side wall of the micro-oxygen electrolysis cell housing 21 is driven by a gear rack to rotate around the vertical axis of the micro-oxygen electrolysis cell housing 21, and the layered opening and closing ring plate 281 rotates relative to the first layered partition plate 213, thereby controlling the connection state of each opening and closing flow hole 282 and the layered flow hole 2130, that is, controlling the connection state of two adjacent micro-oxygen electrolysis layered spaces 2030 in the vertical direction; each opening and closing flow hole 282 and the layered flow hole 2130 are mutually displaced and isolated, that is, in a "non-connected" state, and each opening and closing flow hole 282 and the layered flow hole 2130 are aligned and connected in the vertical direction, that is, in a "connected" state.

[0074] Embodiment 11: Based on embodiment 9, Fig.11 , Fig.12 As shown, a bioaerated filter tank support column 31 is provided with a bioaerated filter tank volume variable mechanism 42, which includes a volume variable support plate 421 connected to the top of the bioaerated filter tank support column 31 and arranged horizontally, and a plurality of volume variable filling shells 422 are fixed to the lower side of the volume variable support plate 421; the bioaerated filter tank support column 31 is a hollow structure with an opening facing upward, and a volume variable lifting cylinder 423 with an opening facing downward is slidably connected in the bioaerated filter tank support column 31. The volume variable support plate 421 is fixedly connected to the top of the volume variable lifting cylinder 423; a volume variable driving rod 424 for driving the volume variable lifting cylinder 423 to move up and down is provided in the aerated biological filter support column 31, and the volume variable driving rod 424 is an electrically controlled telescopic rod in the prior art. The outer rod end of the volume variable driving rod 424 is fixedly connected to the bottom of the aerated biological filter support column 31, and the inner rod end of the volume variable driving rod 424 is fixedly connected to the top of the volume variable lifting cylinder 423.

[0075] Embodiment 12: This embodiment records a water treatment method based on a micro-oxygen electrolytic ion exchange biofilter. The water treatment device based on a micro-oxygen electrolytic ion exchange biofilter according to Embodiment 11 is different from Embodiment 10 in that, in step S3, the volume of the aerated biofilter treatment space 303 is adjusted by using the aerated biofilter volume variable mechanism 42. On the premise of ensuring that the wastewater can fully contact with the second filler 3001, the volume that meets the actual situation can achieve a better wastewater treatment effect; the volume variable mechanism 42 is used to adjust the volume of the aerated biofilter treatment space 303. The retraction of the inner rod of the driving rod 424 can drive the variable-volume lifting cylinder 423 to move downward together with the variable-volume support plate 421. The variable-volume support plate 421 drives each variable-volume filling shell 422 to extend into the aerated biological filter treatment space 303. Each variable-volume filling shell 422 occupies part of the volume of the aerated biological filter treatment space 303, thereby changing the actual available volume of the aerated biological filter treatment space 303. Even when the water volume is small, it can ensure that the wastewater can fully contact the second filler 3001.

[0076] Embodiment 13: The difference from Embodiment 12 is that, in step S1, the hydraulic retention time of the regulating tank 11 is 5 hours; a dephosphorization agent is added to the dephosphorization tank 12, and the dephosphorization agent includes a combination of polyaluminum chloride PAC and polyacrylamide PAM in a mass ratio of 2:1, and the addition amount is 2.5 mg / L; in step S2, the dissolved oxygen content of the wastewater in the micro-oxygen electrolysis treatment space 203 is controlled at 1 mg / L; the hydraulic retention time of the wastewater in the micro-oxygen electrolysis treatment space 203 is 2.5 hours; the spacing distance between the micro-oxygen electrolysis anode plate 241 and the micro-oxygen electrolysis cathode plate 242 is 1 cm, and the current density applied by the first power supply 240 is 5A / m 2 ; The backwashing air-water ratio is 25:1; the first filler 2001 is ceramsite, and its filling rate is 80%V / V1, wherein V is the filling volume of the first filler 2001, and V1 is the volume of the micro-oxygen electrolysis treatment space 203; wherein in step S3, the dissolved oxygen concentration of the wastewater in the aerated biological filter treatment space 303 is controlled at 3.5 mg / L; the hydraulic retention time of the wastewater in the aerated biological filter treatment space 303 is 6 hours; the second filler 3001 is zeolite, and the filling rate of the second filler 3001 is 80%V2 / V3, wherein V2 is the filling volume of the second filler 3001, and V3 is the volume of the aerated biological filter treatment space 303; the backwashing air-water ratio is 25:1; wherein in step S5, the reflux ratio of the wastewater is 250%.

[0077] Embodiment 14: The difference from Embodiment 12 is that, in step S1, the hydraulic retention time of the regulating tank 11 is 3 hours; a dephosphorization agent is added to the dephosphorization tank 12, and the dephosphorization agent includes a combination of polyaluminum chloride PAC and polyacrylamide PAM in a mass ratio of 2:1, and the addition amount is 1 mg / L; in step S2, the dissolved oxygen content of the wastewater in the micro-oxygen electrolysis treatment space 203 is controlled at 1 mg / L; the hydraulic retention time of the wastewater in the micro-oxygen electrolysis treatment space 203 is 1 hour; the spacing distance between the micro-oxygen electrolysis anode plate 241 and the micro-oxygen electrolysis cathode plate 242 is 1.5 cm, and the current density applied by the first power supply 240 is 2A / m 2 ; The backwashing air-water ratio is 30:1; the first filler 2001 is ceramsite, and its filling rate is 60%V / V1, wherein V is the filling volume of the first filler 2001, and V1 is the volume of the micro-oxygen electrolysis treatment space 203; wherein in step S3, the dissolved oxygen concentration of the wastewater in the aerated biological filter treatment space 303 is controlled at 3.5 mg / L; the hydraulic retention time of the wastewater in the aerated biological filter treatment space 303 is 5 hours; the second filler 3001 is zeolite, and the filling rate of the second filler 3001 is 60%V2 / V3, wherein V2 is the filling volume of the second filler 3001, and V3 is the volume of the aerated biological filter treatment space 303; the backwashing air-water ratio is 30:1; wherein in step S5, the reflux ratio of the wastewater is 100%.

[0078] Embodiment 15: The difference from Embodiment 12 is that, in step S1, the hydraulic retention time of the regulating tank 11 is 6 hours; a dephosphorization agent is added to the dephosphorization tank 12, and the dephosphorization agent includes a combination of polyaluminum chloride PAC and polyacrylamide PAM in a mass ratio of 2:1, and the addition amount is 3 mg / L; in step S2, the dissolved oxygen content of the wastewater in the micro-oxygen electrolysis treatment space 203 is controlled at 1 mg / L; the hydraulic retention time of the wastewater in the micro-oxygen electrolysis treatment space 203 is 3 hours; the spacing distance between the micro-oxygen electrolysis anode plate 241 and the micro-oxygen electrolysis cathode plate 242 is 2 cm, and the current density applied by the first power supply 240 is 10 A / m 2 ; The backwashing air-water ratio is 25:1; the first filler 2001 is ceramsite, and its filling rate is 70%V / V1, wherein V is the filling volume of the first filler 2001, and V1 is the volume of the micro-oxygen electrolysis treatment space 203; wherein in step S3, the dissolved oxygen concentration of the wastewater in the aerated biological filter treatment space 303 is controlled at 3.5 mg / L; the hydraulic retention time of the wastewater in the aerated biological filter treatment space 303 is 5.5 hours; the second filler 3001 is zeolite, and the filling rate of the second filler 3001 is 70%V2 / V3, wherein V2 is the filling volume of the second filler 3001, and V3 is the volume of the aerated biological filter treatment space 303; the backwashing air-water ratio is 25:1; wherein in step S5, the reflux ratio of the wastewater is 200%.

[0079] Comparative Example 1: A control group aerated biological filter process was set up. The structural composition of the control group aerated biological filter process was consistent with the structure of the aerated biological filter 30 in Example 13, and the operating parameters and wastewater influent water quality indicators were consistent with those in the process of Example 13.

[0080] Data analysis 1: Figures 16 to 19 As shown, after data detection and analysis, for wastewater with influent COD: 116.7 mg / L, TN: 13.2 mg / L, TP: 1.3 mg / L, the effluent COD removal rate of wastewater purification treatment using the process of Example 13 reached 85.8%, NH4 + -N removal rate reached 92.1%, TN removal rate reached 53.1%, TP removal rate reached 70.7%, compared with the control group aerated biological filter process, COD and NH4 + -N removal rate is equivalent, TN removal rate is increased by 1.3 times, and TP removal rate is increased by 4.8 times.

[0081] Comparative Example 2: A control group aerated biological filter process was set up. The structural composition of the control group aerated biological filter process was consistent with the structure of the aerated biological filter 30 in Example 14, and the operating parameters and wastewater influent water quality indicators were consistent with those in the process of Example 14.

[0082] Data analysis 2: After data detection and analysis, for wastewater with influent COD: 116.7 mg / L, TN: 13.2 mg / L, TP: 1.3 mg / L, the effluent COD removal rate of wastewater purification treatment using the process of Example 14 reached 81.5%, NH4 + -N removal rate reached 91.8%, TN removal rate reached 43.2%, TP removal rate reached 54.8%, compared with the control group aerated biological filter process, COD and NH4 + -N removal rate is equivalent, TN removal rate is increased by 0.9 times, and TP removal rate is increased by 3.5 times.

[0083] Comparative Example 3: A control group aerated biological filter process was set up. The structural composition of the control group aerated biological filter process was consistent with the structure of the aerated biological filter 30 in Example 15, and the operating parameters and wastewater influent water quality indicators were consistent with those in the process of Example 15.

[0084] Data analysis 3: After data detection and analysis, for wastewater with influent COD: 116.7 mg / L, TN: 13.2 mg / L, TP: 1.3 mg / L, the effluent COD removal rate of wastewater purification treatment using the process of Example 15 reached 83.8%, NH4 +-N removal rate reached 90.9%, TN removal rate reached 47.7%, TP removal rate reached 62.1%, compared with the control group aerated biological filter process, COD and NH4 + -N removal rate is equivalent, TN removal rate is increased by 1.1 times, and TP removal rate is increased by 4.1 times.

[0085] According to the above data analysis, the water treatment method based on the micro-oxygen electrolytic ion exchange biofilter of the present invention can improve the TN removal rate by 0.9 to 1.3 times, the TP removal rate by 3.5 to 4.8 times, and the COD and NH4 + -N removal efficiency is comparable.

Claims

1. A water treatment device based on a micro-oxygen electrolysis ion exchange biofilter, characterized in that: It comprises a pretreatment mechanism (10), a micro-oxygen electrolytic biofilter (20) and an aerated biofilter (30) connected to the pretreatment mechanism (10); The pretreatment mechanism (10) comprises a regulating tank (11) and a phosphorus removal tank (12) which are connected to each other; The micro-oxygen electrolysis biofilter (20) comprises a micro-oxygen electrolysis cell outer shell (21) with an opening facing upward and a micro-oxygen electrolysis cell inner shell (22) fixed in the micro-oxygen electrolysis cell outer shell (21) and with an opening facing upward; A supporting partition lower plate (211) and a supporting partition upper plate (212) are fixed inside the micro-oxygen electrolysis cell housing (21); an initial input space (201) is formed between the lower side of the supporting partition lower plate (211) and the bottom of the micro-oxygen electrolysis cell housing (21); and a supporting layer space (202) is formed between the supporting partition lower plate (211) and the supporting partition upper plate (212); The supporting layer space (202) is filled with a first supporting layer filler (204); A micro-oxygen electrolysis treatment space (203) is formed between the inner wall of the micro-oxygen electrolysis cell outer shell (21), the outer wall of the micro-oxygen electrolysis cell inner shell (22), and the upper side of the supporting partition upper plate (212); The micro-oxygen electrolysis treatment space (203) is filled with a first filler (2001); A plurality of horizontally placed first layered baffles (213) are fixed in the micro-oxygen electrolysis treatment space (203), and a micro-oxygen electrolysis layered space (2030) is formed between two adjacent first layered baffles (213); An exchange membrane fixing ring (23) coaxially arranged with the micro-oxygen electrolysis cell housing (21) is fixed to the lower side of the first layered partition plate (213); the exchange membrane fixing ring (23) has a plurality of exchange membrane installation slots (231) radially extending through the micro-oxygen electrolysis cell housing (21); an anion exchange membrane (230) is fixed in the exchange membrane installation slots (231); Each of the micro-oxygen electrolysis stratified spaces (2030) is provided with a plurality of micro-oxygen electrolysis anode plates (241) and micro-oxygen electrolysis cathode plates (242); The micro-oxygen electrolysis anode plate (241) and the micro-oxygen electrolysis cathode plate (242) are electrically connected to the positive electrode and the negative electrode of the first power source (240), respectively; The anion exchange membrane (230) separates the micro-oxygen electrolysis stratification space (2030) into a micro-oxygen electrolysis anode chamber (2031) and a micro-oxygen electrolysis cathode chamber (2032); The micro-oxygen electrolysis anode plate (241) is located in the micro-oxygen electrolysis anode chamber (2031) and is fixedly connected to the inner wall of the micro-oxygen electrolysis cell shell (21); the micro-oxygen electrolysis cathode plate (242) is located in the micro-oxygen electrolysis cathode chamber (2032) and is fixedly connected to the outer wall of the micro-oxygen electrolysis cell inner shell (22); The aerated biological filter (30) comprises an aerated biological filter support column (31) fixed in the micro-aerobic electrolysis tank inner shell (22) and extending vertically, an aeration input partition (311) is fixed in the micro-aerobic electrolysis tank inner shell (22), and an aeration biological filter input space (301) is formed between the aeration input partition (311) and the inner bottom of the micro-aerobic electrolysis tank inner shell (22); An aerated biological filter treatment space (303) is formed in the micro-aerobic electrolysis cell inner shell (22) above the aeration input baffle (311); An aerated biological filter treatment space (303) is formed in the micro-aerobic electrolysis cell inner shell (22) above the aeration input partition (311); The aerated biological filter treatment space (303) is filled with a second filler (3001); A plurality of horizontally arranged second stratified baffles (312) are fixed in the aerated biological filter treatment space (303), and an aerated biological stratified treatment space (3030) is formed between two adjacent second stratified baffles (312); An aerated biological support layer (302) is formed between the upper side of the aeration input baffle (311) and the lowermost second layer baffle (312); The aerated biological support layer (302) is filled with a second support layer filler (304).

2. The water treatment device based on micro-oxygen electrolysis ion exchange biofilter according to claim 1 is characterized in that: The dephosphorization tank (12) is connected to the interior of the micro-oxygen electrolysis cell housing (21) via a distributed transport mechanism (13), wherein the distributed transport mechanism (13) comprises a plurality of distributed water inlet communication shells (131) fixed to the bottom of the micro-oxygen electrolysis cell housing (21), and the bottom of the micro-oxygen electrolysis cell housing (21) has a plurality of distributed water inlet through holes (130) for connecting the initial input space (201) to the interior of the distributed water inlet communication shells (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 dephosphorization tank (12).

3. The water treatment device based on micro-oxygen electrolysis ion exchange biofilter according to claim 1, characterized in that: A circulating stirring mechanism (26) is provided in the micro-oxygen electrolysis stratified space (2030), the circulating stirring mechanism (26) comprising an arc-shaped support slide rail (261) fixed to the bottom of the first stratified partition plate (213), a circulating stirring support slider (262) being slidably connected to the arc-shaped support slide rail (261), and a circulating stirring driving plate (260) being fixed to the circulating stirring support slider (262).

4. The water treatment device based on micro-oxygen electrolysis ion exchange biofilter according to claim 1, characterized in that: A volume partitioning mechanism (27) is provided in the micro-oxygen electrolysis processing space (203) within the micro-oxygen electrolysis cell housing (21), wherein the volume partitioning mechanism (27) comprises a plurality of volume partitioning baffles (271) fixed in the micro-oxygen electrolysis layered space (2030) and extending along a radial plane of the micro-oxygen electrolysis cell housing (21); The volume separation barrier plate (271) is slidably connected to a volume separation matching plate (272) on its side, and the volume separation matching plate (272) slides radially along the micro-oxygen electrolysis cell housing (21); The volume separation blocking plate (271) has a plurality of adjacent circulation holes (2710) extending along two sides thereof, and the volume separation matching plate (272) has a plurality of adjacent circulation matching holes (2720) extending along two sides thereof; A partition drive fixed cylinder (273) extending in the radial direction and open at one end is fixed to the inner side wall of the micro-oxygen electrolysis cell housing (21); a partition drive sliding cylinder (274) is slidably connected inside the partition drive fixed cylinder (273); and the outer end of the partition drive sliding cylinder (274) is fixedly connected to the volume partition matching plate (272); A partition driving telescopic rod (275) for driving the partition driving sliding cylinder (274) to move is arranged in the partition driving fixed cylinder (273).

5. The water treatment device based on micro-oxygen electrolysis ion exchange biofilter according to claim 1, characterized in that: The first layered baffle (213) is provided with a layered opening and closing mechanism (28), the layered opening and closing mechanism (28) comprising a layered opening and closing ring plate (281) rotatably connected to the upper side of the first layered baffle (213), the layered opening and closing ring plate (281) having a plurality of vertically penetrating opening and closing circulation holes (282), and the first layered baffle (213) having a plurality of layered circulation holes (2130).

6. The water treatment device based on micro-oxygen electrolysis ion exchange biofilter according to claim 1, characterized in that: The aerated biological filter input space (301) is connected to the initial input space (201) via a plurality of denitrification return pipes (34), and the denitrification return pipes (34) are provided with return control valves (341); The denitrification reflux pipe (34) is provided with a liquid delivery pump for refluxing the wastewater in the aerated biological filter treatment space (303) to the micro-oxygen electrolysis treatment space (203); A plurality of transfer pipes (33) are fixed on the side wall of the micro-aerobic electrolysis cell inner shell (22), one end of the transfer pipe (33) is arranged along the radial extension of the micro-aerobic electrolysis cell outer shell (21), and the other end of the transfer pipe (33) extends into the aerated biological filter input space (301); A plurality of vertically extending transfer and transport branch pipes (331) are fixed to the lower side of the portion of the transfer and transport pipe (33) located in the micro-oxygen electrolysis cell housing (21).

7. The water treatment device based on micro-oxygen electrolysis ion exchange biofilter according to claim 1, characterized in that: A plurality of micro-nano aeration mechanisms (41) are arranged in the initial input space (201) and the aerated biological filter input space (301), the micro-nano aeration mechanism (41) comprising an aeration generating tube (411) sealed at both ends, an aeration pressurizing piston (412) being slidably connected in the aeration generating tube (411), and the aeration pressurizing piston (412) dividing the aeration generating tube (411) into an aeration pressurizing space (4111) and an aeration driving space (4112); An aeration water inlet pipe (413) connected to the aeration pressurized space (4111) is fixed outside the aeration generating pipe (411), and an aeration water inlet control valve (4130) is provided on the aeration water inlet pipe (413); An air input pipe (414) connected to the interior of the aeration generating pipe (411) is fixed to the outside of the aeration generating pipe (411), and an air input control valve (4140) is provided on the air input pipe (414); An aeration external discharge pipe (415) connected to the aeration pressurized space (4111) is fixed outside the aeration generating pipe (411), and a plurality of aeration expanders (416) are fixed on the aeration external discharge pipe (415); The aeration vent pipe (415) is provided with an aeration vent control valve (4150); An aeration driving telescopic rod (419) for driving the aeration pressurizing piston (412) to move is fixed in the aeration driving space (4112); The aeration expander (416) comprises a trumpet-shaped aeration expander shell (4161) which is connected to the aeration external discharge pipe (415); the smaller end of the aeration expander shell (4161) is connected to the aeration external discharge pipe (415); an aeration dispersion baffle (417) is fixed inside the aeration expander shell (4161); the aeration dispersion baffle (417) is a honeycomb plate with hollowed-out sides; and an aeration diffusion net (418) is fixed to the larger end of the aeration expander shell (4161).

8. The water treatment device based on micro-oxygen electrolysis ion exchange biofilter according to claim 1, characterized in that: The aerated biological filter support column (31) is provided with a variable volume mechanism (42) for the aerated biological filter, the variable volume mechanism (42) for the aerated biological filter comprising a variable volume support plate (421) connected to the top of the aerated biological filter support column (31) and arranged horizontally, and a plurality of variable volume filling shells (422) are fixed to the lower side of the variable volume support plate (421); The aerated biological filter support column (31) is a hollow structure with an opening facing upwards, a variable volume lifting cylinder (423) with an opening facing downwards is slidably connected inside the aerated biological filter support column (31), and the variable volume support plate (421) is fixedly connected to the top of the variable volume lifting cylinder (423); A variable volume driving rod (424) for driving the variable volume lifting cylinder (423) to move upward and downward is provided in the aerated biological filter support column (31).

9. The water treatment device based on micro-oxygen electrolysis ion exchange biofilter according to claim 1, characterized in that: A tail treatment mechanism (50) is provided in communication with the aerated biological filter treatment space (303), the tail treatment mechanism (50) comprising a tail treatment holding tank (51), a plurality of horizontally placed graded filtration support plates (52) being fixed in the tail treatment holding tank (51), a plurality of vertically through filter element fixing holes (521) being provided on the graded filtration support plates (52), a vertically through filter element holding cylinder (53) being fixed in the filter element fixing holes (521), a filter element sealing plate (530) being fixed at each of the upper and lower ends of the filter element holding cylinder (53), the filter element sealing plate (530) being a porous hollow structure with two sides communicating with each other; The filter element receiving tube (53) is filled with activated carbon; The lower end of the tail treatment holding tank (51) is connected to the aerated biological filter treatment space (303) via a tail treatment water inlet pipe (511), and the tail treatment water inlet pipe (511) is provided with a liquid delivery pump; A plurality of tail treatment drainage pipes (512) connected to the interior of the tail treatment holding tank (51) are fixed to the upper end of the outer side of the tail treatment holding tank (51); A vertically extending tail stirring shaft (54) is rotatably connected to the bottom of the tail processing holding tank (51), and a plurality of tail stirring blades (541) are fixed to the tail stirring shaft (54). A stirring drive housing (55) is fixed to the lower end of the tail processing holding tank (51), and the lower end of the tail stirring shaft (54) extends into the stirring drive housing (55). A tail stirring drive motor (551) for driving the tail stirring shaft (54) to rotate is fixed in the stirring drive housing (55).

10. A water treatment method based on a micro-aerobic electrolytic ion exchange biofilter, based on the water treatment device based on a micro-aerobic electrolytic ion exchange biofilter according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Wastewater pretreatment: The wastewater to be treated is first transported to a regulating tank (11) to remove most of the suspended particles; The hydraulic retention time of the regulating pond (11) is 3 to 6 hours; The wastewater in the regulating tank (11) is then transported to the phosphorus removal tank (12) by a transport pump to remove particulate phosphorus; Adding a dephosphorizing agent to the dephosphorizing tank (12), wherein the dephosphorizing agent comprises a combination of polyaluminium chloride and polyacrylamide in a mass ratio of 2:1, and the addition amount is 1-3 mg / L; S2. Wastewater is treated by micro-oxygen electrolysis: The wastewater in the dephosphorization tank (12) is transported to the initial input space (201), and the dispersed water inlet pipe (132) is provided with a liquid transport pump, and the wastewater in the dephosphorization tank (12) is first transported to the initial input space (201) by the liquid transport pump; The pretreated wastewater is first transported to the initial input space (201). After entering the initial input space (201), the wastewater flows from bottom to top and sequentially passes through the supporting layer space (202) and each micro-oxygen electrolysis layer space (2030). The dissolved oxygen content of the wastewater in the micro-oxygen electrolysis treatment space (203) is controlled at 0.5-1.5 mg / L; The hydraulic retention time of the wastewater in the micro-oxygen electrolysis treatment space (203) is 1 to 3 hours; The micro-oxygen electrolysis anode plate (241) and the micro-oxygen electrolysis cathode plate (242) are electrically connected to the positive electrode and the negative electrode of the first power source (240), respectively; The distance between the micro-oxygen electrolysis anode plate (241) and the micro-oxygen electrolysis cathode plate (242) is 1-2 cm, and the current density applied by the first power source (240) is 2-10 A / m 2 ; By applying a moderate current under micro-aerobic conditions, based on the electrochemical action under micro-aerobic conditions, the microbial activity on the first filler (2001) is greatly improved, the enrichment of functional bacteria is enhanced, additional electron donors are provided and the electron transport chain is improved, the metabolic activity of microorganisms is promoted, and the degradation of organic matter, the denitrification process and the short-range nitrification and denitrification process are accelerated; The wastewater is mainly treated with micro-aerobic electrolysis (203) to remove total nitrogen; The first filler (2001) is ceramsite, and its filling rate is 60% to 80% V / V1, wherein V is the filling volume of the first filler (2001), and V1 is the volume of the micro-oxygen electrolysis treatment space (203); S3. Wastewater is treated by aeration and biological treatment: The wastewater treated by micro-oxygen electrolysis is transported to the aerated biological filter input space (301). After entering the aerated biological filter input space (301), the wastewater flows from bottom to top and sequentially passes through the aerated biological support layer (302) and each aerated biological stratified treatment space (3030); The dissolved oxygen concentration of the wastewater in the aerated biological filter treatment space (303) is controlled at 3.0~4.0 mg / L; The hydraulic retention time of the wastewater in the aerated biological filter treatment space (303) is 5 to 6 hours; The second filler (3001) is zeolite, and the filling rate of the second filler (3001) is 60% to 80% V2 / V3, V2 is the filling volume of the second filler (3001), and V3 is the volume of the aerated biological filter treatment space (303); A microenvironment with an aerobic outer surface and anoxic inner surface is formed around the second filler (3001) in the aerated biological filter treatment space (303), and microorganisms attached to the second filler (3001) are used to achieve simultaneous nitrification and denitrification, thereby improving the removal efficiency of organic matter and nitrogen; S4, wastewater reflux treatment: The wastewater after aeration biological treatment enters the initial input space (201), and flows from bottom to top along with the water flow, passing through the supporting layer space (202) and each micro-oxygen electrolysis layer space (2030) in sequence; The wastewater undergoes a short-range nitrification and denitrification process under the micro-oxygen condition of the micro-oxygen electrolysis cathode chamber (2032), and nitrite nitrogen accumulates. A portion of the accumulated nitrite nitrogen enters the micro-oxygen electrolysis anode chamber (2031) through the anion exchange membrane (230) and is reduced to nitrogen gas, and a portion of the nitrite nitrogen directly undergoes a short-range denitrification process to become nitrogen gas. At the same time, the reflux wastewater is rich in nitrate nitrogen. High-concentration nitrate nitrogen and nitrite nitrogen enter the micro-oxygen electrolysis anode chamber (2031) through the anion exchange membrane (230) in the micro-oxygen electrolysis cathode chamber (2032), and are reduced to nitrogen gas in the micro-oxygen electrolysis anode chamber (2031). The denitrification process is enhanced under the synergistic effect of microbiology and electrochemistry. S5. Wastewater recycling treatment: The wastewater in the aerated biological filter treatment space (303) enters the micro-oxygen electrolysis treatment space (203), and then is circulated and treated in the micro-oxygen electrolysis treatment space (203); The wastewater return ratio is 100%~250%.

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