CN113387515A - Graphene material production wastewater treatment process - Google Patents
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C02F1/00—Treatment of water, waste water, or sewage
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- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
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- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
Abstract
A process for treating the waste water generated by preparing graphene material includes filtering, regulating pH value, microelectrolysis, efficient reaction, anaerobic treatment, aerobic treatment, deposition, membrane filtering, collecting purified water and cyclic use. The invention is specially used for purifying the wastewater generated in the production of graphene by thermal cracking, has the advantages of high and rapid treatment efficiency, and the treated purified water body meets the national discharge standard.
Description
Technical Field
The invention relates to the technical field of wastewater treatment and environmental protection equipment, and particularly relates to a graphene material production wastewater treatment process.
Background
Graphene is a new material with a carbon atom monolayer two-dimensional honeycomb lattice structure, has excellent optical, electrical and mechanical properties, and has important application prospects in the aspects of materials science, micro-nano processing, energy, biomedicine, drug delivery and the like. The industrial preparation and production technology is the current hotspot. The raw material for preparing graphene can be carbon-based material, such as phenolic resin and the like, the carbon-based material is heated in a closed environment, carbon bonds are broken and pyrolyzed into gas-phase carbon atoms, and the carbon bonds are recombined and deposited under the action of a catalyst to form layered graphene crystals.
Relevant prior documents on the preparation of graphene from phenolic resins were retrieved:
1. the research on the mechanism of graphene formation by pyrolysis of nickel modified phenolic resin, new materials for chemical industry, 2016 (8 months) and applied chemical research institute of Wuhan science and technology university.
2. A method for preparing graphene by pyrolyzing iron modified phenolic resin; application No.: CN 201911312908.5; the applicant: wuhan university of science and technology; and (3) abstract: a method for preparing graphene by pyrolyzing iron modified phenolic resin belongs to the technical field of graphene. Under the protection of inert gas, controlling the heating rate to be 15-30 ℃, heating the temperature to 800-1500 ℃, and pyrolyzing for 2.5-10 h to obtain graphene, wherein the iron-modified phenolic resin is obtained by taking a phenolic compound, an aldehyde compound and an alkaline catalyst under the catalytic action of a chelating agent and ferrocene; the yield of the obtained iron modified phenolic resin is more than 83%, and the efficiency of preparing graphene by catalytic pyrolysis of the iron modified phenolic resin is higher.
Although the method for preparing graphene is high in efficiency and high in yield, in the process of preparing graphene, the primary product obtained by thermal cracking needs to be washed and subjected to impurity removal by using organic solvents such as acetone, hydrochloric acid and pyridine, acid liquor and clear water, and the like, so that a relatively pure graphene product can be obtained. Therefore, a large amount of organic amorphous carbon impurities, catalyst metal compounds such as nickel and other heavy metal harmful compounds and various organic solvents are generated in the washing and impurity removing process and dissolved in the discharged wastewater, and if the wastewater is randomly and directly discharged, the environment is seriously polluted. Therefore, such waste water is subjected to purification treatment. In the prior literature, relevant data about the treatment of wastewater specially used for the production of graphene by thermal cracking is not retrieved.
Disclosure of Invention
The invention provides a process for treating wastewater generated in graphene material production, which is specially used for purifying wastewater generated in the production of graphene through thermal cracking, and has the advantages of high treatment efficiency and high speed, and the treated sewage meets the national discharge standard.
The technical scheme of the invention is realized as follows:
a graphene material production wastewater treatment process comprises the following steps:
the first step of filtration: sewage is collected by the sewage tank and then is introduced into the water collecting tank;
and a second step of adjusting pH: the water collecting tank is connected with an acid liquid barrel through a pipeline and a dosing pump, and the PH value of the sewage in the water collecting tank is adjusted to 5.0-5.5;
third step micro-electrolysis: introducing the sewage of the water collecting tank into a micro-electrolysis module;
the fourth step of high-efficiency reaction: introducing sewage into the high-efficiency reaction module from the micro-electrolysis module, and adding a solvent into each chamber in the high-efficiency reaction module respectively;
the fifth step is biochemical anaerobic treatment: introducing the sewage into an anaerobic tank for anaerobic degradation;
the sixth step is biochemical aerobic treatment: introducing the sewage into an aerobic tank for aerobic degradation, wherein the aeration rate is 25-30m for carrying out weight communication per square meter;
and seventh step, precipitation: introducing the sewage into a precipitation module for precipitation, and adding a nitrogen removal agent with the mass percent of 10%;
eighth step, membrane filtration: introducing qualified sewage into a membrane separation module for membrane purification;
collecting purified water in the ninth step: the treated water is introduced into a clean water tank and can be recycled or directly discharged.
The high-efficiency reactor is divided into 4 chambers, and the four chambers are connected with a pump through pipelines in sequence: the first chamber is connected with the hydrochloric acid barrel B through a pipeline, the second chamber is connected with the ferrous sulfate solution barrel and the hydrogen peroxide solution barrel through a pipeline, and the third chamber is connected with the sodium hydroxide solution barrel through a pipeline; the fourth chamber is connected with a polyaluminium chloride solution barrel and a polyacrylamide solution barrel through a rotating shaft pipe.
In the first chamber, the sewage is adjusted to pH 3-4 to prepare for the reaction in the second chamber; in the second chamber, the chain reaction between ferrous ions Fe2+ in ferrous sulfate and hydrogen peroxide catalyzes to generate hydroxyl radical-OH, which has strong oxidizability, and oxidizes the organic pollutants which are difficult to degrade in the wastewater into active decomposable inorganic matters, thereby providing a foundation for the subsequent reaction. Entering a third chamber, adjusting the pH value to 8-9 by using a sodium hydroxide solution to prepare for the reaction of a fourth chamber, and in the fourth chamber, firstly introducing a polyaluminum chloride solution, and then introducing a polyacrylamide solution, wherein the two are subjected to a flocculation reaction; the polyaluminium chloride has colloid charge, has extremely strong adsorbability on suspended matters in water, achieves the aim of coagulating the suspended matters in the water, and the water-soluble linear high molecular polymer formed by polymerizing the polyacrylamide monomer through free radical initiation has good flocculation property, can reduce the frictional resistance between liquids, forms larger flocculate after the reaction of the polyacrylamide monomer and the liquid, and converts dirt in sewage into solid state.
The hydrochloric acid barrel B contains 17.5% by mass of hydrochloric acid; the hydrogen peroxide solution barrel is filled with 15 mass percent of hydrogen peroxide solution, the ferrous sulfate solution barrel is filled with 5 mass percent of ferrous sulfate solution, the polyaluminium chloride solution barrel is filled with 5 mass percent of polyaluminium chloride, the polyacrylamide solution barrel is filled with 0.1 mass percent of polyphenyl dilute amide, and the sodium hydroxide solution barrel is filled with 10 mass percent of sodium hydroxide solution. .
And a motor is arranged above the fourth cavity, a motor shaft drives the hollow rotating shaft pipe to rotate through a belt, the polyaluminium chloride solution barrel, the polyacrylamide solution barrel and the air pipe are connected to the rotating pipe joint, the rotating shaft pipe is connected with the hollow blades through a passage, and liquid/air holes are densely distributed on the hollow blades. Firstly, introducing a polyaluminium chloride solution into a rotating shaft tube, rotating the rotating shaft tube and a hollow blade at the same time, allowing the polyaluminium chloride solution to escape into water from holes, and under the action of stirring and dissipation, highly electrically neutralizing and bridging colloids and particles in the water, and removing micro-toxic substances, nickel and other heavy metal ions; then, introducing a polyacrylamide solution to enable suspended substances to flocculate particles into larger flocculates through electric neutralization and bridging adsorption, so as to facilitate subsequent further treatment; and finally introducing compressed air, stirring the solution in the cavity by airflow for about 2-3min, and enhancing the full reaction and flocculation of the polyaluminium chloride solution barrel and the polyacrylamide solution by utilizing the stress of air blasting in water.
The micro-electrolyzer is an iron-carbon micro-electrolyzer, the water inlet pipe is connected to the lower part of the tank body and provided with a plurality of uniformly distributed pipe orifices, the compressed air spray pipe is arranged below the pipe orifices of the water inlet pipe, the middle part of the tank body is an iron-carbon packing layer, the upper part of the packing layer is a clear water layer, and the clear water layer is provided with a water outlet pipe. The micro-electrolyzer utilizes a metal corrosion principle method to form a good process for treating wastewater by a galvanic cell, which is also called an internal electrolysis method, an iron scrap filtration method and the like. Under the condition of no power supply, the micro-electrolysis material filled in the wastewater generates potential difference to carry out electrolysis treatment on the wastewater so as to achieve the purpose of degrading organic pollutants. The potential difference between iron-carbon particles is used to form numerous fine cells, which use iron with low potential as anode and carbon with high potential as cathode to make electrochemical reaction in aqueous solution containing acidic electrolyte. The air jet pipe arranged at the bottom of the tank body continuously jets air bubbles to the packing layer (reaction layer), and the bursting effect of the bubbles in the packing layer is utilized, so that the phenomenon of packing hardening in the packing layer is solved, the micro-electrolysis reaction is quicker, and the efficiency is higher.
The sedimentation module is divided into a pre-sedimentation tank and a static sedimentation tank, the pre-sedimentation tank is connected with a nitrogen removal agent tank through a pipeline and a dosing pump, an L-shaped downpipe is arranged at the liquid level of the pre-sedimentation tank, the tail end of the downpipe is introduced into the middle lower part of the static sedimentation tank, a plurality of liquid outlet holes are arranged on the horizontal pipe at the tail end, and the holes are upward; the upper part of the static sedimentation tank is provided with a water outlet pipe, and the denitrifier solution barrel is 10% of denitrifier by mass percent. Sewage firstly enters a pre-sedimentation tank from the top through a pipeline, large-volume flocculate and sludge are settled from the pre-sedimentation tank, the sewage is discharged from a conical bottom sludge discharge pipe below, the clear water on the upper layer enters a static sedimentation tank from an L-shaped pipe by utilizing liquid level difference, and is slowly discharged upwards from a liquid outlet hole of a tail end horizontal pipe, the flocculate and impurities are settled to the bottom of the tank below the horizontal pipe, the liquid discharged out of the tank cannot disturb the sediment at the bottom of the tank, the water can be kept static, the sedimentation effect is good, and the clear water on the upper layer is discharged through a water outlet pipe.
The nitrogen removing agent is prepared from the following raw materials in parts by weight: 25-40 parts of aluminum chloride and 25-35 parts of bentonite; 8-16 parts of calcium sulfate; 10-16 parts of sodium carboxymethylcellulose; 4-10 parts of sodium bicarbonate; 2-6 parts of sodium lauryl maleate; 17-19 parts of sodium hypochlorite; 4-6 parts of ferric trichloride. The sewage contains a certain amount of ammonia nitrogen, and a denitrifier is added into a pre-sedimentation tank of the sedimentation tank to react with NH3 and NH4+ in the water, so that the sewage is absorbed or converted into N2 or N2O to be dissipated into the atmosphere, and the environment is not adversely affected.
The bottom surfaces of the pre-sedimentation tank and the static sedimentation tank are both inclined surfaces or conical surfaces, and are provided with sludge discharge outlets.
The water outlet pipe of the aerobic tank is connected with a water return pipe to the water inlet of the anaerobic tank. When the water quality after passing through the aerobic tank does not meet the requirement, the sewage can flow back to the anaerobic tank again for anaerobic-aerobic treatment again. Aerobic tank in biochemical module adopts corridor formula passageway, and the aeration pipe lets in to the passageway bottom and aerates. The BOD and COD of the wastewater treated by the biochemical module are greatly reduced.
The membrane separation module is composed of a plurality of tubular membrane filters connected in parallel, the filtering particle size is 5-7nm, and the filtering pressure is 0.1-0.2 MPa. The tubular ultrafiltration membrane filter intercepts macromolecular impurities, suspended colloids and the like in the sewage, and finally obtains cleaner purified water which is discharged to a clean water tank for storage and reuse.
The advantages of the invention are as follows:
(1) the method is specially used for the sewage generated by preparing the graphene through thermal cracking of the phenolic resin, and can decompose organic pollutants contained in the sewage, passivate heavy metal pollutants and effectively treat the heavy metal pollutants, so that the finally treated water quality reaches the national discharge standard and can be recycled and reused for washing graphene products. Harmful substance in the graphite alkene waste water is mainly high concentration poisonous organic pollutant, graphite particle impurity and catalyst heavy metal ion, handles through converting poisonous organic pollutant into biochemical organic matter or inorganic matter, carries out the discharge after passivation adsorption precipitation innoxious with particle impurity and heavy metal ion, realizes the innoxious treatment of waste water.
(2) The invention utilizes the compressed air to accelerate the reaction rate in the sewage treatment process, improve the purification efficiency and improve the purification effect of the waste water.
(3) The treatment equipment has the advantages of compact structure, high treatment efficiency, low operation cost and small occupied area.
(4) The wastewater treatment method is low in cost, and the cost for treating wastewater per cubic meter is about 1.2 Yuan/m.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of a pre-filter module;
FIG. 3 is a schematic structural view of a micro-electrolysis module;
FIG. 4 is a schematic structural diagram of a high efficiency reaction module;
FIG. 5 is a schematic diagram of a biochemical module;
FIG. 6 is a schematic diagram of the structure of a precipitation module;
the reference numbers in the figures illustrate: 1-a sewage tank; 2-a water collecting tank; 3-micro-electrolysers; 31-fan A; 4-high efficiency reactor; 5-anaerobic jar; 6-an aerobic tank; 61-fan B; 62-reflux pump; 7-a sedimentation tank; 8-a membrane filter; 9-clean water pool.
Detailed Description
Example 1
A graphene material production wastewater treatment process comprises the following steps:
the first step of filtration: sewage is collected by the sewage tank 11 and then is introduced into the water collecting tank 12;
and a second step of adjusting pH: the water collecting tank 12 is connected with an acid liquid barrel through a pipeline and a dosing pump, and the PH value of the sewage in the water collecting tank 12 is adjusted to 5.0-5.5;
third step micro-electrolysis: introducing the sewage in the water collecting tank 12 into the micro-electrolysis module 2;
the fourth step of high-efficiency reaction: introducing sewage from the micro-electrolysis module 2 into the high-efficiency reaction module 3, and adding a solvent into each chamber in the high-efficiency reaction module 3 respectively;
the fifth step is biochemical anaerobic treatment: introducing the sewage into an anaerobic tank 41 for anaerobic degradation;
the sixth step is biochemical aerobic treatment: introducing the sewage into an aerobic tank 42 for aerobic degradation, wherein the aeration rate is 25-30m for carrying out weight management per square meter;
and seventh step, precipitation: introducing the sewage into a precipitation module 5 for precipitation, and adding a nitrogen removal agent with the mass percentage of 10%;
eighth step, membrane filtration: introducing qualified sewage into a membrane separation module 6 for membrane purification;
collecting purified water in the ninth step: the treated water is passed into a clean water tank 7 and can be recycled or directly discharged.
The high-efficiency reaction module 3 is divided into 4 chambers, and the four chambers are connected with a pump through pipelines in sequence: the first chamber is connected with the hydrochloric acid barrel B through a pipeline, the second chamber is connected with the ferrous sulfate solution barrel and the hydrogen peroxide solution barrel through a pipeline, and the third chamber is connected with the sodium hydroxide solution barrel through a pipeline; the fourth chamber is connected with a polyaluminium chloride solution barrel and a polyacrylamide solution barrel through a rotating shaft pipe.
The hydrochloric acid barrel is filled with 17.5 percent by mass of hydrochloric acid; the hydrogen peroxide solution barrel is filled with 15 mass percent of hydrogen peroxide solution, the ferrous sulfate solution barrel is filled with 5 mass percent of ferrous sulfate solution, the polyaluminium chloride solution barrel is filled with 5 mass percent of polyaluminium chloride, the polyacrylamide solution barrel is filled with 0.1 mass percent of polyphenyl dilute amide, and the sodium hydroxide solution barrel is filled with 10 mass percent of sodium hydroxide solution.
And a motor is arranged above the fourth cavity, a motor shaft drives the hollow rotating shaft pipe to rotate through a belt, the polyaluminium chloride solution barrel, the polyacrylamide solution barrel and the air pipe are connected to the rotating pipe joint, the rotating shaft pipe is connected with the hollow blades through a passage, and liquid/air holes are densely distributed on the hollow blades.
The micro-electrolysis module 2 is an iron-carbon micro-electrolyzer, a water inlet pipe 22 is connected to the lower part of the tank body and is provided with a plurality of uniformly distributed pipe orifices, a compressed air spray pipe 23 is arranged below the pipe orifices of the water inlet pipe, an iron-carbon packing layer 24 is arranged in the middle of the tank body, a clear water layer is arranged above the packing layer 24, and a water outlet pipe is arranged on the clear water layer.
The precipitation module 5 is divided into a pre-precipitation tank 51 and a static precipitation tank 52, the pre-precipitation tank 51 is connected with a nitrogen removal agent tank through a pipeline and a dosing pump, an L-shaped downpipe is arranged at the liquid level of the pre-precipitation tank 51, the tail end of the L-shaped downpipe is introduced into the middle lower part of the static precipitation tank 52, a plurality of liquid outlet holes are formed in a horizontal pipe at the tail end, and the holes are upward; the upper part of the static sedimentation tank 52 is provided with a water outlet pipe.
The nitrogen removing agent is prepared from the following raw materials in parts by weight: 25-40 parts of aluminum chloride and 25-35 parts of bentonite; 8-16 parts of calcium sulfate; 10-16 parts of sodium carboxymethylcellulose; 4-10 parts of sodium bicarbonate; 2-6 parts of sodium lauryl maleate; 17-19 parts of sodium hypochlorite; 4-6 parts of ferric trichloride.
The bottom surfaces of the pre-sedimentation tank 51 and the static sedimentation tank 52 are both inclined surfaces or conical surfaces, and are provided with sludge discharge outlets.
The water outlet pipe of the biochemical module 4 is connected with a water return pipe to the water inlet of the anaerobic tank 42.
The membrane separation module 6 is composed of a plurality of tubular membrane filters connected in parallel, the filtering particle size is 5-7nm, and the filtering pressure is 0.1-0.2 MPa.
The application example is as follows:
the system of the embodiment 1 of the invention treats the wastewater for about 10-12h daily, and the total treatment capacity is 100T;
after the sewage is treated by the equipment, the water quality is detected:
the method comprises the following steps of (1) detecting the content of heavy metal nickel in the sewage, wherein the detection result is as follows:
Claims (10)
1. a graphene material production wastewater treatment process is characterized by comprising the following steps:
the first step of filtration: sewage is collected by the sewage tank (11) and then is introduced into the water collecting tank (12);
and a second step of adjusting pH: the water collecting tank (12) is connected with an acid liquid barrel through a pipeline and a dosing pump, and the PH value of the sewage in the water collecting tank (12) is adjusted to 5.0-5.5;
third step micro-electrolysis: introducing the sewage in the water collecting tank (12) into the micro-electrolysis module (2);
the fourth step of high-efficiency reaction: introducing sewage into the high-efficiency reaction module (3) from the micro-electrolysis module (2), and respectively adding a solvent into each chamber in the high-efficiency reaction module (3);
the fifth step is biochemical anaerobic treatment: introducing the sewage into an anaerobic tank (41) for anaerobic degradation;
the sixth step is biochemical aerobic treatment: introducing the sewage into an aerobic tank (42) for aerobic degradation, wherein the aeration rate is 25-30m for cultivating square meters per square meter;
and seventh step, precipitation: introducing the sewage into a precipitation module (5) for precipitation, and adding a nitrogen removal agent with the mass percentage of 10%;
eighth step, membrane filtration: introducing qualified sewage into a membrane separation module (6) for membrane purification;
collecting purified water in the ninth step: the treated water is led into a clean water tank (7) and can be recycled or directly discharged.
2. The graphene material production wastewater treatment process according to claim 1, characterized in that: the high-efficiency reaction module (3) is divided into 4 chambers, and the four chambers are connected with a pump through pipelines in sequence: the first chamber is connected with the hydrochloric acid barrel B through a pipeline, the second chamber is connected with the ferrous sulfate solution barrel and the hydrogen peroxide solution barrel through a pipeline, and the third chamber is connected with the sodium hydroxide solution barrel through a pipeline; the fourth chamber is connected with a polyaluminium chloride solution barrel and a polyacrylamide solution barrel through a rotating shaft pipe.
3. The graphene material production wastewater treatment process according to claim 2, characterized in that: the hydrochloric acid barrel is filled with 17.5 percent by mass of hydrochloric acid; the hydrogen peroxide solution barrel is filled with 15 mass percent of hydrogen peroxide solution, the ferrous sulfate solution barrel is filled with 5 mass percent of ferrous sulfate solution, the polyaluminium chloride solution barrel is filled with 5 mass percent of polyaluminium chloride, the polyacrylamide solution barrel is filled with 0.1 mass percent of polyphenyl dilute amide, and the sodium hydroxide solution barrel is filled with 10 mass percent of sodium hydroxide solution.
4. The graphene material production wastewater treatment process according to claim 2, characterized in that: and a motor is arranged above the fourth cavity, a motor shaft drives the hollow rotating shaft pipe to rotate through a belt, the polyaluminium chloride solution barrel, the polyacrylamide solution barrel and the air pipe are connected to the rotating pipe joint, the rotating shaft pipe is connected with the hollow blades through a passage, and liquid/air holes are densely distributed on the hollow blades.
5. The graphene material production wastewater treatment process according to claim 1, characterized in that: the micro-electrolysis module (2) is an iron-carbon micro-electrolyzer, the water inlet pipe (22) is connected to the lower part of the tank body and is provided with a plurality of uniformly distributed pipe orifices, the compressed air spray pipe (23) is arranged below the pipe orifices of the water inlet pipe, the middle part of the tank body is an iron-carbon packing layer (24), the upper part of the packing layer (24) is a clear water layer, and the clear water layer is provided with a water outlet pipe.
6. The graphene material production wastewater treatment process according to claim 1, characterized in that: the sedimentation module (5) is divided into a pre-sedimentation tank (51) and a static sedimentation tank (52), the pre-sedimentation tank (51) is connected with a nitrogen removal agent tank through a pipeline and a dosing pump, an L-shaped downpipe is arranged at the liquid level of the pre-sedimentation tank (51), the tail end of the downpipe is communicated to the middle lower part of the static sedimentation tank (52), a plurality of liquid outlet holes are arranged on a horizontal pipe at the tail end, and the holes are upward; the upper part of the static sedimentation tank (52) is provided with a water outlet pipe.
7. The graphene material production wastewater treatment process according to claim 6, characterized in that: the nitrogen removing agent is prepared from the following raw materials in parts by weight: 25-40 parts of aluminum chloride and 25-35 parts of bentonite; 8-16 parts of calcium sulfate; 10-16 parts of sodium carboxymethylcellulose; 4-10 parts of sodium bicarbonate; 2-6 parts of sodium lauryl maleate; 17-19 parts of sodium hypochlorite; 4-6 parts of ferric trichloride.
8. The graphene material production wastewater treatment process according to claim 6, characterized in that: the bottom surfaces of the pre-sedimentation tank (51) and the static sedimentation tank (52) are both inclined surfaces or conical surfaces, and are provided with sludge discharge outlets.
9. The graphene material production wastewater treatment process according to claim 1, characterized in that: the water outlet pipe of the biochemical module (4) is connected with a water return pipe to the water inlet of the anaerobic tank (42).
10. The graphene material production wastewater treatment process according to claim 1, characterized in that: the membrane separation module (6) is composed of a plurality of tubular membrane filters connected in parallel, the filtering particle size is 5-7nm, and the filtering pressure is 0.1-0.2 MPa.
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