Lithium iron phosphate wastewater treatment device

Abstract

The utility model discloses a lithium iron phosphate wastewater treatment device, which relates to the technical field of lithium iron phosphate wastewater treatment and comprises an equipment cleaning water tank, a water outlet of the equipment cleaning water tank is communicated with a filtering device for filtering and separating equipment cleaning water, and a sludge discharge port of the filtering device is communicated with a sludge treatment device. A water outlet of the sludge treatment device is communicated with a middle water tank, and the water outlet of the sludge treatment device is communicated with a second water inlet of the middle water tank. During use, equipment cleaning water can be pretreated through the filter device and the sludge treatment device so as to improve the biodegradability of the equipment cleaning water, and meanwhile, tail gas absorption water can be pretreated through the electrolytic catalytic oxidation system and the scum treatment device so as to improve the biodegradability of the tail gas absorption water; and then the pretreated equipment cleaning water and tail gas absorption water are mixed for synchronous biochemical treatment and filtration, so that the wastewater treatment process is effectively shortened, and the wastewater treatment efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium iron phosphate wastewater treatment technical field especially relates to a lithium iron phosphate wastewater treatment device. BACKGROUND

[0002] In the green era with the goal of "double carbon", the energy structure is accelerating to change, and new energy vehicles and energy storage power stations have developed rapidly, among which lithium ion batteries with lithium iron phosphate (LiFePO4) as the positive material have been widely used due to its characteristics of not containing cobalt and other valuable metals, low price, rich resources, stable structure, excellent cycling performance, long charging life, safety and reliability, green and non-toxic.

[0003] In the production process of lithium iron phosphate, the mill needs to be regularly maintained and cleaned, and the wastewater after cleaning the equipment will contain suspended solids such as iron phosphate, lithium carbonate and glucose. At the same time, when sintering tail gas absorption is carried out, sintering tail gas absorption water containing tar, COD, suspended solids and other pollutants will be produced. These equipment cleaning wastewater and sintering tail gas absorption water need to be treated by purification before being discharged.

[0004] The Chinese invention patent with patent number 202310420894.9 records a lithium iron phosphate cleaning wastewater recycling treatment method and system. The patent uses coagulation and sedimentation preposition, uses ferrous sulfate and flocculant to flocculate and precipitate SS in wastewater under alkaline conditions, and the excess ferrous iron spontaneously precipitates in the alkaline pH environment in the sedimentation tank to reduce the SS in the water quality. The sludge water separation and recovery of the sedimentation sludge, the supernatant is added to adjust the pH and enters the biochemical system to fully degrade COD, ammonia nitrogen and other impurities, and then is filtered, RO pure water desalination, and enters the circulation system. The pretreatment process of this patent is long, and the sedimentation effect is poor.

[0005] And for sintering tail gas absorption water, the Chinese invention patent with patent number 202210798532.9 records a lithium iron phosphate production wastewater treatment system, which includes wastewater collection tank, first primary reaction tank, second primary reaction tank, primary sedimentation tank, first secondary reaction tank, second secondary reaction tank, secondary sedimentation tank, pH adjustment tank, biochemical system, and discharge monitoring tank connected in sequence. The sludge discharge port of the primary sedimentation tank, the secondary sedimentation tank, and the integrated MBR wastewater treatment device is communicated with the sludge tank through a pipeline. The deficiency of this patent is that the pretreatment system using two-stage reaction precipitation by sequentially adding Ca2+ / PAC / PAM and Fe3+ / PAC / PAM cannot solve the problem of difficult biodegradation of tar in lithium iron phosphate wastewater. The biochemical effect of the subsequent A / A / O / MBR biochemical system is affected. This invention gives a new solution according to the characteristics of the equipment cleaning water and tail gas absorption water generated in the production of lithium iron phosphate, combined with the deficiencies of the existing related patents. UTILITY MODEL CONTENTS

[0006] The utility model discloses a lithium iron phosphate wastewater treatment device to solve the problems in the above background.

[0007] To realize above-mentioned purpose, the utility model provides the following technical scheme: a lithium iron phosphate wastewater treatment device, including equipment cleaning pool, the water outlet of equipment cleaning pool is connected with the filter device for filtering separation to equipment cleaning water, the sludge discharge port of filter device is connected with sludge treatment device, the water outlet of sludge treatment device is connected with intermediate pool, the water outlet of sludge treatment device and the second water inlet of intermediate pool are connected,

[0008] Still include tail gas absorption pool, the water outlet of tail gas absorption pool is connected with the electrolytic catalytic oxidation system for processing tail gas absorption water, the water outlet of electrolytic catalytic oxidation system is connected with dross treatment device, the dross treatment device includes slag outlet, the water outlet of dross treatment device is connected with intermediate pool, the water outlet of dross treatment device and the first water inlet of intermediate pool are connected,

[0009] The water outlet of intermediate pool is connected with multistage biochemical treatment device, the water outlet of multistage biochemical treatment device is connected with membrane bioreactor, the water outlet of membrane bioreactor is connected with membrane suction pump, and the water outlet of membrane suction pump is connected with treatment water pool.

[0010] Preferably, the filter device includes a filter pump connected to the water outlet of the equipment cleaning pool, the filter pump is connected to a polytetrafluoroethylene filter, the polytetrafluoroethylene filter is connected to a filter water tank, the polytetrafluoroethylene filter is connected to the sludge treatment device, and the filter water tank is connected to the second water inlet of the intermediate pool.

[0011] Preferably, the sludge treatment device includes a filter collection tank, the filter collection tank is connected to a filter dewatering system through a filter pressurizing pump, the filter dewatering system is connected to the second water inlet of the equipment cleaning pool, and the filter dewatering system is provided with a sludge outlet.

[0012] Preferably, the dross treatment device includes a solid-liquid separation device, the solid-liquid separation device is connected to the water outlet of the electrolytic catalytic oxidation system, the solid-liquid separation device is connected to a dross collection pool through a dross pressurizing pump, the dross collection pool is connected to a dross dewatering system, the dross dewatering system is connected to the second water inlet of the tail gas absorption pool, and the dross dewatering system includes a dross outlet.

[0013] Preferably, the solid-liquid separation device is a nanobubble flotation tank, and the water outlet of the nanobubble flotation tank is connected with the first water inlet of the intermediate water tank, so that the micro-nano bubbles in the nanobubble flotation tank can generate strong oxidizing substances such as free radicals when they break, which can oxidize and decompose the refractory organic matter in the wastewater, improve the biodegradability of the wastewater, and be beneficial to the subsequent biological treatment.

[0014] Preferably, the multi-stage biochemical treatment device comprises a hydrolysis acidification tank and a high-efficiency anaerobic reactor, the water outlet of the intermediate water tank is connected with the water inlet of the hydrolysis acidification tank through a biochemical lifting pump, the water outlet of the hydrolysis acidification tank is connected with the water inlet of the high-efficiency anaerobic reactor through an anaerobic lifting pump, and the water outlet of the high-efficiency anaerobic reactor is connected with the water inlet of the membrane bioreactor, so that the hydrolysis acidification tank can convert macromolecular organic matter in the wastewater into small molecules, thereby improving the biodegradability of the wastewater, being beneficial to the subsequent biological treatment process, and making it easier for microorganisms to degrade the organic matter.

[0015] Preferably, the high-efficiency anaerobic reactor is additionally provided with an anaerobic circulating pump, the liquid inlet of the anaerobic circulating pump is connected with the circulating liquid outlet of the high-efficiency anaerobic reactor, and the water outlet of the anaerobic circulating pump is connected with the water inlet of the high-efficiency anaerobic reactor, so that the anaerobic circulating pump can make the water inlet of the high-efficiency anaerobic reactor have an upward flow rate of greater than or equal to 0.5 m / H, thereby avoiding anaerobic sludge sedimentation and being beneficial to the formation of anaerobic granular sludge, and improving the biochemical treatment effect of the high-efficiency anaerobic reactor.

[0016] Preferably, the multi-stage biochemical treatment device further comprises an aerobic biochemical tank, the water outlet of the high-efficiency anaerobic reactor is connected with the first water inlet of the aerobic biochemical tank, the water outlet of the aerobic biochemical tank is connected with the water inlet of the membrane bioreactor, and the aerobic biochemical tank is additionally provided with an aerobic aeration blower, and the air outlet of the aerobic aeration blower is connected with the air inlet of the aerobic biochemical tank.

[0017] Preferably, the polytetrafluoroethylene filter is connected with a filter backwashing pump, and the membrane bioreactor is connected with a membrane backwashing pump.

[0018] Preferably, the water inlet of the filter backwashing pump is connected with the water outlet of the filter water tank, and the water inlet of the membrane backwashing pump is connected with the water outlet of the treated water tank, so that the polytetrafluoroethylene filter and the membrane bioreactor can be washed by using the intermediate water and the terminal treatment water generated in the wastewater treatment, thereby realizing the recycling of the treated water resources, saving water resources, reducing the cost of wastewater treatment, improving the economy and practicability of the wastewater treatment device.

[0019] In summary, the technical effects and advantages of the utility model are as follows:

[0020] The utility model discloses, through the filter device and sludge treatment device that set up, can carry out the pretreatment to the equipment cleaning water to improve its bio -degradability, can carry out the pretreatment to the tail gas absorption water through electrolytic catalytic oxidation system and dross treatment device to improve its bio -degradability, then after the equipment cleaning water and tail gas absorption water that carry out the pretreatment mix after multistage biochemical treatment device and membrane biological reactor carry out biochemical treatment and filter, can effectively improve the purification treatment effect to waste water, and through the equipment cleaning water and tail gas absorption water pretreatment mix to carry out biochemical treatment and filter simultaneously, effectively shorten the waste water treatment flow, improve the efficiency of waste water treatment.

[0021] The utility model discloses, through filter backwash pump and membrane backwash pump that set up, filter backwash pump's water inlet and filter water tank's water outlet are linked together, and membrane backwash pump's water inlet and treatment water pool's water outlet are linked together, can utilize the intermediate water and terminal treatment water that produce in waste water treatment to the polytetrafluoroethylene filter and membrane biological reactor are washed, thereby realized the recycling of treatment water resources, saved water resources and reduced the cost of waste water treatment, improved the economy and practicality of this waste water treatment device. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to make the technical scheme of the embodiments of the utility model or the prior art clearer, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0023] Figure 1 It is the system structure schematic drawing of a kind of lithium iron phosphate wastewater treatment device in the utility model embodiment.

[0024] In the drawing: 1, equipment cleaning pool;21, filter pump;22, polytetrafluoroethylene filter;23, filter water tank;231, filter water pump;31, filter material collection tank;32, filter material pressurizing pump;33, filter material dehydration system;4, intermediate water pool;5, tail gas absorption water pool;51, pretreatment lifting pump;6, electrolytic catalytic oxidation system;71, nano air flotation pool;72, dross collection pool;73, dross pressurizing pump;74, dross dehydration system;81, hydrolysis acidification pool;82, high-efficiency anaerobic reactor;83, biochemical lifting pump;831, anaerobic circulation pump;84, anaerobic lifting pump;85, membrane biological reactor;851, membrane suction pump;852, membrane scrubbing fan;86, aerobic biochemical pool;87, aerobic aeration fan;88, treatment water pool;881, drainage pump;9, filter backwash pump;10, membrane backwash pump. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0026] Please refer to Figure 1 The equipment cleaning water is connected to the first water inlet of the equipment cleaning water pool 1, the water outlet of the equipment cleaning water pool 1 is connected to the water inlet of the polytetrafluoroethylene filter 22 through the filter pump 21, and the sludge outlet of the polytetrafluoroethylene filter 22 is connected to the sludge inlet of the filter collection tank 31.

[0027] As preferred, the filtering precision of the polytetrafluoroethylene filter 22 is 0.1 μm, which can effectively intercept the iron phosphate and lithium carbonate in the recycled water, so that the suspended matter content of the equipment cleaning water is filtered from 500-1500 mg / L to less than 5 mg / L, the filter material is pressed through the plate and frame filter press, the iron phosphate and lithium carbonate in the equipment cleaning water can be effectively recycled, the recovery rate of the iron phosphate and lithium carbonate is greater than 99%, and the phosphorus and lithium resources are saved.

[0028] The sludge outlet of the filter collection tank 31 in the sludge treatment device is connected to the sludge inlet of the filter dewatering system 33 through the filter material pressurizing pump 32, the water outlet of the filter dewatering system 33 is connected to the second water inlet of the equipment cleaning water pool 1, the sludge outlet of the filter dewatering system 33 sends out the filter cake for recycling, and the water outlet of the polytetrafluoroethylene filter 22 is connected to the water inlet of the filtered water tank 23.

[0029] The water outlet of the filtered water tank 23 is connected to the backwashing water inlet of the polytetrafluoroethylene filter 22 through the filter backwashing pump 9, and the water outlet of the filtered water tank 23 is connected to the second water inlet of the intermediate water pool 4 through the filtered water pump 231.

[0030] The tail gas absorption water is connected to the first water inlet of the tail gas absorption water pool 5, the water outlet of the tail gas absorption water pool 5 is connected to the water inlet of the electrolytic catalytic oxidation system 6 through the pretreatment lifting pump 51, and the water outlet of the electrolytic catalytic oxidation system 6 is connected to the water inlet of the nano air flotation tank 71.

[0031] For the sintering tail gas absorption water containing tar, suspended matter and various pollutants, the tar in the tail gas absorption water can be electrolyzed and catalytically oxidized by using the electrolytic catalytic oxidation, the difficultly biodegradable organic matters such as phenol, aniline, pyridine and naphthalene in the tar are decomposed, and the B / C ratio of the tail gas absorption water is increased from less than 0.1 to greater than 0.3.

[0032] The slag outlet of the nanometer air floatation tank 71 is connected to the slag inlet of the dross collection tank 72, the slag outlet of the dross collection tank 72 is connected to the slag inlet of the dross dehydration system 74 through the dross pressurizing pump 73, the water outlet of the dross dehydration system 74 is connected to the second water inlet of the tail gas absorption water tank 5, and the slag outlet of the dross dehydration system 74 is connected to the dross outlet.

[0033] The nanometer air floatation tank 71 can remove more than 50% of the refractory pollutants in the wastewater, reduce the content of the tail gas absorption water from 5000-15000 mg / L to 3000-10000 mg / L, and thus improve the biodegradability of the tail gas absorption wastewater.

[0034] The water outlet of the nanometer air floatation tank 71 is connected to the first water inlet of the intermediate water tank 4, the water outlet of the intermediate water tank 4 is connected to the water inlet of the hydrolysis acidification tank 81 through the biochemical lifting pump 83, the water outlet of the hydrolysis acidification tank 81 is connected to the water inlet of the high-efficiency anaerobic reactor 82 through the anaerobic lifting pump 84, the circulating liquid outlet of the high-efficiency anaerobic reactor 82 is also connected to the water inlet of the high-efficiency anaerobic reactor 82 through the anaerobic circulating pump 831, the water outlet of the high-efficiency anaerobic reactor 82 is connected to the first water inlet of the aerobic biochemical tank 86, and the air outlet of the aerobic aeration blower 87 is connected to the air inlet of the aerobic biochemical tank 86.

[0035] The hydrolysis acidification tank 81 can hydrolyze and acidify the wastewater, open the ring and break the chain of the benzene and naphthalene organic pollutants in the wastewater, and further improve the biodegradability of the wastewater. Then, the wastewater is treated by the high-efficiency anaerobic reactor 82 for anaerobic biochemical treatment, and under the action of the anaerobic circulating pump 831, the water inlet of the high-efficiency anaerobic reactor 82 has an upward flow rate of ≥0.5 m / H, which can not only avoid the deposition of anaerobic sludge, but also be beneficial to the formation of anaerobic granular sludge, further improve the biochemical treatment effect of the high-efficiency anaerobic reactor 82, and the removal rate reaches 40-60%.

[0036] The water outlet of the aerobic biochemical tank 86 is connected to the water inlet of the membrane bioreactor 85, the air outlet of the membrane scrubbing blower 852 is connected to the air inlet of the membrane bioreactor 85, the water outlet of the membrane bioreactor 85 is connected to the water inlet of the treated water tank 88 through the membrane suction pump 851, the water outlet of the treated water tank 88 is connected to the backwashing water inlet of the membrane bioreactor 85 through the membrane backwashing pump 10, the backwashing water outlet of the membrane bioreactor 85 is connected to the second water inlet of the aerobic biochemical tank 86, and the water outlet of the treated water tank 88 is also connected to the drainage pump 881 to send the discharge water.

[0037] The lithium iron phosphate wastewater treatment method comprises the following steps.

[0038] The equipment cleaning water is filtered through the polytetrafluoroethylene filter 22 with a filtration precision of 0.1 μm to effectively intercept and recover the iron phosphate and lithium carbonate in the recycled water.

[0039] Specific is to use the filter precision of 0.1 μm polytetrafluoroethylene filter 22 for equipment cleaning water filtration, effective retention of equipment cleaning water in the filter, equipment cleaning water pretreatment effluent suspended solids content less than 5 mg / L, polytetrafluoroethylene filter 22 sludge through the filter by filtration system 33 to filter cake recovery, recovery of equipment cleaning water in the iron phosphate and lithium carbonate more than 99%.

[0040] Tail gas absorption water pretreatment: tail gas absorption water through electrolytic catalytic oxidation and nanometer flotation, improve the biochemical properties of wastewater, remove part of the refractory pollutants in wastewater;

[0041] Specific is first to use electrolytic catalytic oxidation of tar in the tail gas absorption water electrolysis and catalytic oxidation, the refractory organic matter such as phenol, aniline, pyridine, naphthalene in the tar is decomposed, the B / C ratio of tail gas absorption water is improved to more than 0.3, then the micron, nanometer level of micro bubbles generated by nanometer flotation will be fine particles and oil in wastewater into scum, collect the electrolytic catalytic oxidation products of tail gas absorption water, and through the dewatering system 74 to remove the scum, thereby effectively improving the biochemical properties of wastewater, more than 50% of the refractory pollutants in wastewater are removed.

[0042] Pretreatment of mixed water high efficiency biochemical treatment: equipment cleaning water pretreatment effluent and tail gas absorption water pretreatment effluent mixed after hydrolysis acidification, high efficiency anaerobic, aerobic biochemical, membrane biological reactor 85 for multistage biochemical treatment and filtration, treatment effluent discharge;

[0043] Specific is first to use hydrolysis acidification tank 81 for hydrolysis acidification of pretreatment mixed water, ring opening, chain scission of benzene, naphthalene organic pollutants in wastewater, further improve the biochemical properties of wastewater, and then through the high efficiency anaerobic reactor for anaerobic biochemical treatment, using anaerobic circulating pump 831 to keep the influent upflow velocity of high efficiency anaerobic reactor 82≥0.5 m / H, which can avoid anaerobic sludge sedimentation and is beneficial to the formation of anaerobic granular sludge, improve the biochemical treatment effect of high efficiency anaerobic reactor 82, COD removal rate reaches 50-80%, then through the aerobic biochemical tank 86 for aerobic biochemical treatment, further reduce the COD of wastewater, finally through the membrane biological reactor 85 of 8000-20000 mg / L high concentration of aerobic sludge for high efficiency aerobic biochemical treatment, and using membrane filtration to reduce the COD of treatment effluent≤50 mg / L, suspended solids≤5 mg / L, so that the effluent discharge.

[0044] The working principle is that the equipment cleaning water is filtered by the polytetrafluoroethylene filter 22 with a filtering precision of 0.1 μm, so as to effectively intercept and recover iron phosphate and lithium carbonate in the recycled water, then the sludge generated by the filtration is sent to the filter collection tank 31 through the sludge outlet of the polytetrafluoroethylene filter 22, the waste water generated by the filtration is sent to the filtered water tank 23 through the water outlet of the polytetrafluoroethylene filter 22, then the filtered water in the filtered water tank 23 is sent to the intermediate water pool 4 through the filtered water pump 231, and the sludge in the filter collection tank 31 is sent to the filter dewatering system 33 through the filter pressurizing pump 32 to be dewatered, and the dewatered waste water is sent to the equipment cleaning water pool 1, so that the pretreatment of the equipment cleaning water is completed.

[0045] The tail gas absorption water is subjected to electrolytic catalytic oxidation and nanometer air flotation, so as to improve the biodegradability of the waste water and remove part of the refractory pollutants in the waste water, then the waste water generated in the nanometer air flotation tank 71 is sent to the intermediate water pool 4, the dregs generated in the nanometer air flotation tank 71 are sent to the dregs collection pool 72, then the dregs in the dregs collection pool 72 are sent to the dregs dewatering system 74, the water dewatered in the dregs dewatering system 74 is sent to the tail gas absorption water pool 5, and the dewatered dregs in the dregs dewatering system 74 are sent out, so that the pretreatment of the tail gas absorption water is completed.

[0046] Subsequently, the mixed water of the equipment cleaning water pretreatment effluent and the tail gas absorption water pretreatment effluent in the intermediate water pool 4 is sent to the hydrolysis acidification tank 81, the high-efficiency anaerobic reactor 82, the aerobic biochemical tank 86 and the membrane bioreactor 85 to be subjected to biochemical treatment and filtration, so as to obtain the treated water which is purified and reaches the discharge standard, then the treated water is sent to the treated water pool 88, and the lithium iron phosphate wastewater treatment is completed.

[0047] Finally, it should be noted that the above is only the preferred embodiment of the present application, and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lithium iron phosphate wastewater treatment device, characterized in that: The device cleaning water pool (1) is connected with a filter device for filtering and separating the device cleaning water, the filter device is connected with a sludge treatment device, the sludge treatment device is connected with an intermediate water pool (4), and the sludge treatment device is connected with the second water inlet of the intermediate water pool (4); The tail gas absorption water pool (5) is connected with an electrolytic catalytic oxidation system (6) for treating the tail gas absorption water, the electrolytic catalytic oxidation system (6) is connected with a scum treatment device, the scum treatment device includes a scum outlet, the scum treatment device is connected with the first water inlet of the intermediate water pool (4); The intermediate water pool (4) is connected with a multi-stage biochemical treatment device, the multi-stage biochemical treatment device is connected with a membrane biological reactor (85), the membrane biological reactor (85) is connected with a membrane suction pump (851), and the membrane suction pump (851) is connected with a treated water pool (88).

2. The lithium iron phosphate wastewater treatment device according to claim 1, characterized in that: The filter device includes a filter pump (21) connected with the water outlet of the device cleaning water pool (1), the filter pump (21) is connected with a polytetrafluoroethylene filter (22), the polytetrafluoroethylene filter (22) is connected with a filter water tank (23), the sludge outlet of the polytetrafluoroethylene filter (22) is connected with the sludge treatment device, and the water outlet of the filter water tank (23) is connected with the second water inlet of the intermediate water pool (4).

3. The lithium iron phosphate wastewater treatment device according to claim 2, characterized in that: The sludge treatment device includes a filter collection tank (31), the filter collection tank (31) is connected with a filter dewatering system (33) through a filter pressurizing pump (32), the filter dewatering system (33) is connected with the second water inlet of the device cleaning water pool (1), and the filter dewatering system (33) is provided with a sludge outlet.

4. The lithium iron phosphate wastewater treatment device of claim 3, wherein: The scum treatment device includes a solid-liquid separation device, the solid-liquid separation device is connected with the water outlet of the electrolytic catalytic oxidation system (6), the scum collection pool (72) is connected with a scum dewatering system (74) through a scum pressurizing pump (73), the scum dewatering system (74) is connected with the second water inlet of the tail gas absorption water pool (5), and the scum dewatering system (74) includes a scum outlet.

5. The lithium iron phosphate wastewater treatment device of claim 4, wherein: The solid-liquid separation device is a nano air flotation pool (71), and the water outlet of the nano air flotation pool (71) is connected with the first water inlet of the intermediate water pool (4). The device cleaning water pool (1) is connected with a filter device for filtering and separating the device cleaning water, the filter device is connected with a sludge treatment device, the sludge treatment device is connected with an intermediate water pool (4), and the sludge treatment device is connected with the second water inlet of the intermediate water pool (4); The tail gas absorption water pool (5) is connected with an electrolytic catalytic oxidation system (6) for treating the tail gas absorption water, the electrolytic catalytic oxidation system (6) is connected with a scum treatment device, the scum treatment device includes a scum outlet, the scum treatment device is connected with the first water inlet of the intermediate water pool (4); The intermediate water pool (4) is connected with a multi-stage biochemical treatment device, the multi-stage biochemical treatment device is connected with a membrane biological reactor (85), the membrane biological reactor (85) is connected with a membrane suction pump (851), and the membrane suction pump (851) is connected with a treated water pool (88). The filter device includes a filter pump (21) connected with the water outlet of the device cleaning water pool (1), the filter pump (21) is connected with a polytetrafluoroethylene filter (22), the polytetrafluoroethylene filter (22) is connected with a filter water tank (23), the sludge outlet of the polytetrafluoroethylene filter (22) is connected with the sludge treatment device, and the water outlet of the filter water tank (23) is connected with the second water inlet of the intermediate water pool (4). The sludge treatment device includes a filter collection tank (31), the filter collection tank (31) is connected with a filter dewatering system (33) through a filter pressurizing pump (32), the filter dewatering system (33) is connected with the second water inlet of the device cleaning water pool (1), and the filter dewatering system (33) is provided with a sludge outlet. The scum treatment device includes a solid-liquid separation device, the solid-liquid separation device is connected with the water outlet of the electrolytic catalytic oxidation system (6), the scum collection pool (72) is connected with a scum dewatering system (74) through a scum pressurizing pump (73), the scum dewatering system (74) is connected with the second water inlet of the tail gas absorption water pool (5), and the scum dewatering system (74) includes a scum outlet. The solid-liquid separation device is a nano air flotation pool (71), and the water outlet of the nano air flotation pool (71) is connected with the first water inlet of the intermediate water pool (4).

6. The lithium iron phosphate wastewater treatment device of claim 5, wherein: The multistage biochemical treatment device comprises a hydrolytic acidification tank (81) and a high-efficiency anaerobic reactor (82), the water outlet of the intermediate water tank (4) is connected with the water inlet of the hydrolytic acidification tank (81) through a biochemical lifting pump (83), the water outlet of the hydrolytic acidification tank (81) is connected with the water inlet of the high-efficiency anaerobic reactor (82) through an anaerobic lifting pump (84), and the water outlet of the high-efficiency anaerobic reactor (82) is connected with the water inlet of a membrane bioreactor (85).

7. The lithium iron phosphate wastewater treatment device of claim 6, wherein: The high-efficiency anaerobic reactor (82) is further provided with an anaerobic circulating pump (831), the liquid inlet of the anaerobic circulating pump (831) is connected with the circulating liquid outlet of the high-efficiency anaerobic reactor (82), and the water outlet of the anaerobic circulating pump (831) is connected with the water inlet of the high-efficiency anaerobic reactor (82).

8. The lithium iron phosphate wastewater treatment device of claim 7, wherein: The multistage biochemical treatment device further comprises an aerobic biochemical tank (86), the water outlet of the high-efficiency anaerobic reactor (82) is connected with the first water inlet of the aerobic biochemical tank (86), the water outlet of the aerobic biochemical tank (86) is connected with the water inlet of the membrane bioreactor (85), and the aerobic biochemical tank (86) is further provided with an aerobic aeration fan (87), the air outlet of the aerobic aeration fan (87) is connected with the air inlet of the aerobic biochemical tank (86).

9. The lithium iron phosphate wastewater treatment device of claim 8, wherein: The polytetrafluoroethylene filter (22) is connected with a filter backwashing pump (9), and the membrane bioreactor (85) is connected with a membrane backwashing pump (10).

10. The lithium iron phosphate wastewater treatment device of claim 9, wherein: The water inlet of the filter backwashing pump (9) is connected with the water outlet of a filter water tank (23), and the water inlet of the membrane backwashing pump (10) is connected with the water outlet of a treatment water tank (88).

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