CN112479467A - Graphite wastewater treatment device and use method thereof - Google Patents

Graphite wastewater treatment device and use method thereof Download PDF

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Publication number
CN112479467A
CN112479467A CN202011536965.4A CN202011536965A CN112479467A CN 112479467 A CN112479467 A CN 112479467A CN 202011536965 A CN202011536965 A CN 202011536965A CN 112479467 A CN112479467 A CN 112479467A
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water
reverse osmosis
tank
electrodialysis
reaction tank
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张耀武
陈希书
陈百俊
郦志先
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Zhejiang Muyuan Environment Engineering Co ltd
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Zhejiang Muyuan Environment Engineering Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B7/00—Halogens; Halogen acids
    • C01B7/01—Chlorine; Hydrogen chloride
    • C01B7/03—Preparation from chlorides
    • C01B7/035—Preparation of hydrogen chloride from chlorides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
    • C01D1/04—Hydroxides
    • C01D1/20—Preparation by reacting oxides or hydroxides with alkali metal salts
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/048—Purification of waste water by evaporation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • 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
    • C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

Abstract

A graphite wastewater treatment device comprises a pretreatment system, an ultrafiltration system, a softening system, a nanofiltration system, an electrodialysis system, a reverse osmosis system and an evaporation system, wherein the pretreatment system comprises a raw water tank, a primary reaction tank, a secondary reaction tank, a plate-and-frame filter press and a sedimentation tank, a backflow pipeline is arranged at the bottom of the sedimentation tank, and clean water enters a subsequent system; clear water enters the ultrafiltration system after the ultrafiltration system is treated by the pretreatment system, backwash water and concentrated solution of the ultrafiltration system flow back to the primary reaction tank, the softening system is provided with a backflow pipeline, and softened soft water enters a subsequent system; the nanofiltration system realizes divalent ion separation, the electrodialysis system concentrates primary saline water to prepare acid and base, and the concentrated water is returned to electrodialysis for desalination; concentrating the reverse osmosis system divalent brine, recycling fresh water, and feeding concentrated water into an evaporation system; the resource process disclosed by the invention is used for carrying out deep comprehensive utilization on the wastewater, and no other by-products or wastes are generated, so that the resource recycling and zero discharge are realized.

Description

Graphite wastewater treatment device and use method thereof
Technical Field
The invention relates to a graphite wastewater treatment device and a use method thereof, belonging to the technical field of wastewater environment-friendly processes.
Background
The existing graphite wastewater treatment is that expanded graphite wastewater firstly enters a reaction triple box after the water quantity is regulated in a regulating tank, lime is added into a first reaction box of the reaction triple box to react with magnesium ions, fluorine ions and bicarbonate radicals in the saline wastewater, sodium carbonate is added into a second reaction box to precipitate calcium ions in the wastewater, then the wastewater enters a clarification tank to carry out solid-liquid separation to remove suspended matters in the wastewater, the effluent of the clarification tank enters expanded graphite reverse osmosis (the recovery rate is 75%) after passing through a multi-media filter and an ultrafiltration device, and the expanded graphite reverse osmosis produced water enters secondary reverse osmosis. And the expanded graphite reverse osmosis concentrated water enters the disc tube type reverse osmosis.
The method comprises the steps of firstly adjusting the water quantity of the wastewater of the three-acid method in an adjusting tank, then feeding the wastewater into a reaction three-header, adding lime into a first reaction box of the reaction three-header, reacting with magnesium ions, fluorine ions and bicarbonate radicals in the saline wastewater, adding sodium carbonate into a second reaction box, precipitating calcium ions in the wastewater, then feeding the wastewater into a clarification tank for solid-liquid separation, removing suspended matters in the water, mixing the effluent of the clarification tank with expanded graphite reverse osmosis concentrated water after passing through a multi-media filter and an ultrafiltration device, feeding the mixture into a disc-tube reverse osmosis (recovery rate is 50%), mixing the disc-tube reverse osmosis produced water with the expanded graphite reverse osmosis produced water, feeding the mixture into a second-stage reverse osmosis, and recycling the produced water.
In conclusion, the general enterprises take calcium chloride and calcium nitrate as building materials. However, in practice, so much waste salt is produced and cannot be disposed. Only piling up is needed. This solid waste still needs to be disposed of after a long time, so this technique has drawbacks.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provides a graphite wastewater treatment device, and the purpose of the invention is achieved through the following technical scheme, the graphite wastewater treatment device comprises a pretreatment system, an ultrafiltration system, a softening system, a nanofiltration system, an electrodialysis system, a reverse osmosis system and an evaporation system which are sequentially connected, wherein the pretreatment system comprises a raw water tank, a primary reaction tank, a secondary reaction tank, a plate and frame filter press and a sedimentation tank which are sequentially connected, the bottom of the sedimentation tank is provided with a bottom mud return pipeline leading to the primary reaction tank, and clean water enters a subsequent pipeline; the clear water treated by the pretreatment system enters the water ultrafiltration system, backwash water and concentrated solution in the ultrafiltration system flow to the primary reaction tank through a return pipeline, and produced water enters a subsequent pipeline; the softening system is provided with a regeneration liquid return pipeline leading to the primary reaction tank, and softened soft water enters a subsequent pipeline; the nanofiltration system realizes the separation of divalent ions, wherein monovalent brine enters the electrodialysis system through a pipeline, and divalent brine enters the reverse osmosis system through a pipeline; the electrodialysis system consists of a homogeneous membrane electrodialysis cell and a bipolar membrane electrodialysis cell respectively, the electrodialysis system is used for concentrating primary saline water, the bipolar membrane system is used for preparing acid and alkali from electrodialysis concentrated saline water, fresh water of the electrodialysis system enters the reverse osmosis system for concentration, produced water is recycled, and concentrated water is returned to the electrodialysis system for desalination treatment; the reverse osmosis system is used for concentrating divalent brine and recycling fresh water.
Preferably, the method comprises the following steps: and a high-pressure reverse osmosis system is arranged on one side of the nanofiltration system, concentrated water is led into the evaporation system by the reverse osmosis system to be evaporated to obtain crystallized salt and condensed water, the crystallized salt is discharged outwards, the condensed water flows into a water production tank through a pipeline, and the produced water is led into the reverse osmosis system for advanced treatment.
A method for treating wastewater by a graphite wastewater treatment device comprises the following steps:
step 1, pretreatment, namely flowing water in a raw water tank into a first-stage reaction tank, adding calcium oxide between the first-stage reaction tank and a second-stage reaction tank, reacting in the second-stage reaction tank, extruding large calcium fluoride sludge through a plate-and-frame filter press, conveying away, adding sodium carbonate into the remaining aqueous solution, flowing into a sedimentation tank for sedimentation, and refluxing settled bottom mud into the first-stage reaction tank for circular reaction;
step 2, ultrafiltration filtration: adding acid into part of the solution in the sedimentation tank to adjust the pH value, introducing the solution into a super filter tank to carry out ultrafiltration reaction, refluxing part of concentrated solution after the reaction to a first-stage reaction tank for further reaction, and flowing the other part of the concentrated solution into a softening tank below the first-stage reaction tank.
Step 3, softening treatment: the produced water from the ultrafiltration system flows into a softening system, the softening system is softened by resin, the resin is regenerated by acid and alkali after being adsorbed and saturated, and the regenerated liquid flows into a primary reaction tank for carrying out treatment reaction;
step 4, nanofiltration system: produce water from ultrafiltration system and carry out the separation of divalent salt again through the system of receiving straining, the second grade salt water flows into the middling pressure reverse osmosis pond through the pipeline and carries out reverse osmosis, and during the electrodialysis system of first order salt moisture inflow bottom, in the concentrated water of middling pressure reverse osmosis partly becomes the salt of crystallization through the evaporation of political system and gets rid of, another part becomes the comdenstion water, and the comdenstion water flows into the product water tank storage that the bottom set up. The clean water from the medium pressure reverse osmosis is fed to a reverse osmosis system for further treatment.
And 5: and the electrodialysis system is used for producing primary saline water from the nanofiltration system, performing electrodialysis concentration on the primary saline water, then enabling the strong brine to flow into the bipolar membrane electrodialysis system for further treatment, enabling fresh water to flow into the high-pressure osmosis system for retreatment, enabling the high-pressure reverse osmosis produced water to flow into the low-pressure reverse osmosis system again for storage, and enabling the low-pressure reverse osmosis concentrated water to flow into the clean water tank for retreatment.
Step 6: and in the bipolar membrane electrodialysis system, concentrated brine enters the bipolar membrane electrodialysis treatment through the electrodialysis system, and finally the obtained products are hydrochloric acid and sodium hydroxide.
The invention adopts a zero-emission and recycling process. Purifying waste salt obtained from graphite wastewater to prepare acid and alkali. The solid waste and hazardous waste of the graphite wastewater treatment can not be treated, the investment of environmental protection cost is large, and simultaneously, the waste of salt resources is caused. The invention aims at the deep comprehensive utilization of the high-salinity and high-acidity wastewater generated in the processing and production process of the graphite ore, so that the high-salinity and high-acidity wastewater is converted into high-added-value sodium hydroxide and hydrochloric acid. No other by-products and wastes are generated, and the resource recycling and zero emission are realized. Compared with the treatment mode of waste salt generated by MVR evaporation, the method has great progress.
Drawings
FIG. 1 is a flow chart of the prior art.
FIG. 2 is a process flow diagram of the present invention.
Detailed Description
The invention will be described in detail below with reference to the following figures: as shown in fig. 2, a graphite wastewater treatment device comprises a pretreatment system 1, an ultrafiltration system 2, a softening system 3, a nanofiltration system 4, an electrodialysis system 5, a reverse osmosis system 6 and an evaporation system 7 which are connected in sequence, wherein the pretreatment system comprises a raw water tank 8, a primary reaction tank 9, a secondary reaction tank 10, a plate-and-frame filter press 11 and a sedimentation tank 12 which are connected in sequence, a bottom sludge return pipeline 13 leading to the primary reaction tank is arranged at the bottom of the sedimentation tank 12, and clean water enters a subsequent pipeline; clear water treated by the pretreatment system 1 enters the ultrafiltration system 2, backwash water and concentrated solution in the ultrafiltration system 2 flow to the primary reaction tank 9 through a return pipeline 14, and produced water enters a subsequent pipeline; the softening system 3 is provided with a regeneration liquid return pipeline 15 leading to the primary reaction tank, and softened soft water enters a subsequent pipeline; the nanofiltration system 4 realizes the separation of divalent ions, wherein monovalent brine enters the electrodialysis system 5 through a pipeline, and divalent brine enters the reverse osmosis system 6 through a pipeline; the electrodialysis system 5 is composed of a homogeneous membrane electrodialysis cell 16 and a bipolar membrane electrodialysis cell 17 respectively, the electrodialysis system 5 is used for concentrating primary saline water, the bipolar membrane electrodialysis system 17 is used for preparing acid and alkali from electrodialysis concentrated saline water, fresh water of the electrodialysis system 5 enters the reverse osmosis system 6 for concentration, produced water is recycled, and concentrated water is returned to the electrodialysis system 5 for desalination treatment; the reverse osmosis system 6 is used for concentrating divalent salt water and recycling fresh water.
And a high-pressure reverse osmosis system 18 is arranged at one side of the nanofiltration system 4, concentrated water is led into the evaporation system 7 by the reverse osmosis system 18 to be evaporated to obtain crystallized salt and condensed water, the crystallized salt is discharged outwards, the condensed water flows into a water production tank 19 through a pipeline 20, and the produced water is led into the reverse osmosis system 6 for advanced treatment through a pipeline 21.
The method for treating the wastewater by the graphite wastewater treatment device comprises the following steps:
step 1, pretreatment, namely flowing water in a raw water tank into a first-stage reaction tank, adding calcium oxide between the first-stage reaction tank and a second-stage reaction tank, reacting in the second-stage reaction tank, extruding large calcium fluoride sludge through a plate-and-frame filter press, conveying away, adding sodium carbonate into the remaining aqueous solution, flowing into a sedimentation tank for sedimentation, and refluxing settled bottom mud into the first-stage reaction tank for circular reaction;
step 2, ultrafiltration filtration: adding acid into part of the solution in the sedimentation tank to adjust the pH value, introducing the solution into a super filter tank to carry out ultrafiltration reaction, refluxing part of concentrated solution after the reaction to a first-stage reaction tank for further reaction, and flowing the other part of the concentrated solution into a softening tank below the first-stage reaction tank.
Step 3, softening treatment: the produced water from the ultrafiltration system flows into a softening system, the softening system is softened by resin, the resin is regenerated by acid and alkali after being adsorbed and saturated, and the regenerated liquid flows into a primary reaction tank for carrying out treatment reaction;
step 4, nanofiltration system: produce water from ultrafiltration system and carry out the separation of divalent salt again through the system of receiving straining, the second grade salt water flows into the middling pressure reverse osmosis pond through the pipeline and carries out reverse osmosis, and during the electrodialysis system of first order salt moisture inflow bottom, in the concentrated water of middling pressure reverse osmosis partly becomes the salt of crystallization through the evaporation of political system and gets rid of, another part becomes the comdenstion water, and the comdenstion water flows into the product water tank storage that the bottom set up. The clean water from the medium pressure reverse osmosis is fed to a reverse osmosis system for further treatment.
And 5: and the electrodialysis system is used for producing primary saline water from the nanofiltration system, performing electrodialysis concentration on the primary saline water, then enabling the strong brine to flow into the bipolar membrane electrodialysis system for further treatment, enabling fresh water to flow into the high-pressure osmosis system for retreatment, enabling the high-pressure reverse osmosis produced water to flow into the low-pressure reverse osmosis system again for storage, and enabling the low-pressure reverse osmosis concentrated water to flow into the clean water tank for retreatment.
Step 6: and in the bipolar membrane electrodialysis system, concentrated brine enters the bipolar membrane electrodialysis treatment through the electrodialysis system, and finally the obtained products are hydrochloric acid and sodium hydroxide.
The method comprises the steps of collecting the drained water in a raw water tank, homogenizing the water quality and the water quantity in the raw water tank, lifting the water to a primary reaction tank and a secondary reaction tank by a lifting water pump of the raw water tank, adding calcium oxide into the reaction tanks, removing calcium fluoride by a plate-and-frame filter press, adding soda ash, a coagulant and a coagulant aid into the supernatant, quickly mixing, automatically flowing to a sedimentation tank for sedimentation reaction, and recovering the bottom mud of the sedimentation tank to the primary reaction tank. The supernatant enters the membrane system.
Conveying the waste water to a sodium bed by a pump for softening again, and discharging the regenerated water of the sodium bed to an adjusting tank for circular treatment mainly for removing calcium ions, magnesium ions and other divalent ions which are easy to scale. And (3) conveying the effluent of the sodium bed to an NF system, removing divalent salt and the like, and then introducing monovalent salt NaCl into an electrodialysis system. The divalent salt enters an evaporation system after entering DTRO for concentration. And (5) recycling the condensed water. And (3) allowing the monovalent salt NaCl to enter an electrodialysis system, concentrating (mixing NF with produced water) to 14%, and allowing the monovalent salt NaCl to enter a bipolar membrane system to prepare acid and alkali. Desalting the electrodialytic fresh water to a reclaimed water reuse index by using a seawater desalting membrane and a reverse osmosis membrane.
The advantages of the invention are as follows:
1. the pretreatment of the invention is the same as the original pretreatment. Collecting the drained water in a raw water tank, homogenizing the water quality and the water quantity in the raw water tank, lifting the water to a primary reaction tank and a secondary reaction tank by a lifting water pump of the raw water tank, adding calcium oxide into the reaction tanks, and removing calcium fluoride by a plate-and-frame filter press.
2. The invention adds the process of converting calcium chloride into sodium chloride, namely, the pretreated supernatant is added with sodium carbonate, and the calcium salt is converted into sodium salt after the reaction is finished; and (4) softening the reacted wild in a sodium bed again, converting the residual calcium ions and magnesium ions into sodium ions, and concentrating the converted NaCL solution in an electrodialysis system.
3. The invention adopts electrodialysis technology to replace a concentrated disc tube type (DTRO) reverse osmosis device in the original process, and the concentration of salt is increased to 200g/L from 90 g/L.
4. The invention adopts a bipolar membrane technology to replace an MVR system, and adopts the bipolar membrane technology to prepare hydrochloric acid and sodium hydroxide from sodium chloride; the sodium chloride is recycled, and the problem of salt treatment is thoroughly solved. The prepared hydrochloric acid and sodium hydroxide can be returned to the graphite processing technology, and the overall operation cost is reduced.
The invention can treat the waste water produced in the production process of industrial enterprises and recycle the treated waste water, and does not discharge waste water to the outside. The final produced water is completely recycled to enterprise users, so that the enterprise users can use the recycled water of the project to replace tap water in the production process, and the production cost can be greatly reduced. In addition, the wastewater is effectively treated and controlled to achieve zero emission of pollutants, the environmental quality can be obviously improved, the amount of precious water resources is protected, and the indirect economic benefit generated by the method is huge.
The strong brine separated by the electrodialysis device is subjected to electrodialysis by the bipolar membrane to generate hydrochloric acid and sodium hydroxide, and the bipolar membrane is not subjected to water dissociation to generate gas and byproducts, so that the voltage is lower, the energy consumption is lower compared with that of the traditional electrolysis method, and the energy is utilized to the maximum extent. According to the fact that a large amount of sodium hydroxide and hydrochloric acid are consumed in the production process of graphite, both the hydrochloric acid and sodium hydroxide generated by the bipolar membrane technology can be utilized, and great economic benefits are generated. The method solves the problem of waste salt, reduces the operating cost, reduces the environmental pollution, and conforms to the environmental protection concept of green production and clean production.

Claims (3)

1. A graphite wastewater treatment device comprises a pretreatment system (1), an ultrafiltration system (2), a softening system (3), a nanofiltration system (4), an electrodialysis system (5), a reverse osmosis system (6) and an evaporation system (7) which are sequentially connected, and is characterized in that the pretreatment system comprises a raw water tank (8), a primary reaction tank (9), a secondary reaction tank (10), a plate-and-frame filter press (11) and a sedimentation tank (12) which are sequentially connected, wherein a bottom sludge backflow pipeline (13) leading to the primary reaction tank is arranged at the bottom of the sedimentation tank (12), and clean water enters a subsequent pipeline; clear water enters the ultrafiltration system (2) after being treated by the pretreatment system (1), backwash water and concentrated solution in the ultrafiltration system (2) flow to the primary reaction tank (9) through a return pipeline (14), and produced water enters a subsequent pipeline; the softening system (3) is provided with a regeneration liquid return pipeline (15) leading to the primary reaction tank, and softened soft water enters a subsequent pipeline; the nanofiltration system (4) realizes the separation of divalent ions, wherein monovalent brine enters the electrodialysis system (5) through a pipeline, and divalent brine enters the reverse osmosis system (6) through a pipeline; the electrodialysis system (5) is composed of a homogeneous membrane electrodialysis cell (16) and a bipolar membrane electrodialysis cell (17), the electrodialysis system (5) is used for concentrating primary saline water, the bipolar membrane electrodialysis cell (17) is used for preparing acid and alkali from electrodialysis concentrated saline water, fresh water of the electrodialysis system (5) enters a reverse osmosis system (6) for concentration, produced water is recycled, and concentrated water is desalted again by the electrodialysis system (5); the reverse osmosis system (6) is used for concentrating divalent brine and recycling fresh water.
2. The graphite wastewater treatment device according to claim 1, characterized in that one side of the nanofiltration system (4) is provided with a high-pressure reverse osmosis system (18), the reverse osmosis system (18) leads concentrated water to an evaporation system (7) to obtain crystallized salt and condensed water through evaporation, the crystallized salt is discharged outwards, the condensed water flows to a water production tank (19) through a pipeline (20), and the produced water leads to the reverse osmosis system (6) through a pipeline (21) for advanced treatment.
3. A method for treating wastewater by the graphite wastewater treatment facility according to claim 1 or 2, characterized in that the method comprises:
step 1, pretreatment, namely flowing water in a raw water tank into a first-stage reaction tank, adding calcium oxide between the first-stage reaction tank and a second-stage reaction tank, reacting in the second-stage reaction tank, extruding large calcium fluoride sludge through a plate-and-frame filter press, conveying away, adding sodium carbonate into the remaining aqueous solution, flowing into a sedimentation tank for sedimentation, and refluxing settled bottom mud into the first-stage reaction tank for circular reaction;
step 2, ultrafiltration filtration: adding acid into part of the solution in the sedimentation tank to adjust the pH value, introducing the solution into a super filter tank to carry out ultrafiltration reaction, refluxing part of concentrated solution after the reaction into a first-stage reaction tank for further reaction, and flowing the other part of the concentrated solution into a softening tank below the first-stage reaction tank;
step 3, softening treatment: the produced water from the ultrafiltration system flows into a softening system, the softening system is softened by resin, the resin is regenerated by acid and alkali after being adsorbed and saturated, and the regenerated liquid flows into a primary reaction tank for carrying out treatment reaction;
step 4, nanofiltration system: the water produced by the ultrafiltration system is subjected to secondary salt separation by the nanofiltration system, secondary salt water flows into a medium-pressure reverse osmosis pool through a pipeline for reverse osmosis, primary salt water flows into an electrodialysis system at the bottom, part of concentrated water subjected to medium-pressure reverse osmosis is evaporated by a political system to be changed into crystallized salt to be discharged, the other part of concentrated water is changed into condensed water, and the condensed water flows into a water production tank arranged at the bottom for storage;
the clean water after medium-pressure reverse osmosis flows into a reverse osmosis system for further treatment;
and 5: the electrodialysis system is used for producing primary saline water from the nanofiltration system, performing electrodialysis concentration on the primary saline water, then enabling the strong brine to flow into the bipolar membrane electrodialysis system for further treatment, enabling fresh water to flow into the high-pressure osmosis system for retreatment, enabling the high-pressure reverse osmosis produced water to flow into the low-pressure reverse osmosis system again for storage, and enabling the low-pressure reverse osmosis concentrated water to flow into the clear water tank for retreatment;
step 6: and in the bipolar membrane electrodialysis system, concentrated brine enters the bipolar membrane electrodialysis treatment through the electrodialysis system, and finally the obtained products are hydrochloric acid and sodium hydroxide.
CN202011536965.4A 2020-12-23 2020-12-23 Graphite wastewater treatment device and use method thereof Pending CN112479467A (en)

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CN113045093A (en) * 2021-03-19 2021-06-29 黔南民族师范学院 Treatment method of graphite product production wastewater
CN113698025A (en) * 2021-07-16 2021-11-26 浙江省环保集团有限公司 System and method for recycling acid and alkali from high-salt-content deacidification wastewater
CN115215452A (en) * 2021-04-15 2022-10-21 国家能源投资集团有限责任公司 Desulfurization wastewater zero-discharge treatment process
US11502323B1 (en) 2022-05-09 2022-11-15 Rahul S Nana Reverse electrodialysis cell and methods of use thereof
US11502322B1 (en) 2022-05-09 2022-11-15 Rahul S Nana Reverse electrodialysis cell with heat pump
CN117023843A (en) * 2023-07-19 2023-11-10 大庆师范学院 Comprehensive treatment device for realizing zero discharge of waste water in graphite industry and application method
US11855324B1 (en) 2022-11-15 2023-12-26 Rahul S. Nana Reverse electrodialysis or pressure-retarded osmosis cell with heat pump
CN115215452B (en) * 2021-04-15 2024-05-03 国家能源投资集团有限责任公司 Zero-emission treatment process for desulfurization wastewater

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113045093A (en) * 2021-03-19 2021-06-29 黔南民族师范学院 Treatment method of graphite product production wastewater
CN115215452A (en) * 2021-04-15 2022-10-21 国家能源投资集团有限责任公司 Desulfurization wastewater zero-discharge treatment process
CN115215452B (en) * 2021-04-15 2024-05-03 国家能源投资集团有限责任公司 Zero-emission treatment process for desulfurization wastewater
CN113698025A (en) * 2021-07-16 2021-11-26 浙江省环保集团有限公司 System and method for recycling acid and alkali from high-salt-content deacidification wastewater
US11502323B1 (en) 2022-05-09 2022-11-15 Rahul S Nana Reverse electrodialysis cell and methods of use thereof
US11502322B1 (en) 2022-05-09 2022-11-15 Rahul S Nana Reverse electrodialysis cell with heat pump
US11563229B1 (en) 2022-05-09 2023-01-24 Rahul S Nana Reverse electrodialysis cell with heat pump
US11611099B1 (en) 2022-05-09 2023-03-21 Rahul S Nana Reverse electrodialysis cell and methods of use thereof
US11699803B1 (en) 2022-05-09 2023-07-11 Rahul S Nana Reverse electrodialysis cell with heat pump
US11855324B1 (en) 2022-11-15 2023-12-26 Rahul S. Nana Reverse electrodialysis or pressure-retarded osmosis cell with heat pump
CN117023843A (en) * 2023-07-19 2023-11-10 大庆师范学院 Comprehensive treatment device for realizing zero discharge of waste water in graphite industry and application method

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