Washing water treatment system

Abstract

The utility model discloses a washing water treatment system and belongs to the technical field of water treatment. The washing water treatment system comprises a precipitation system, a filtering system, an ion exchange system, a primary concentration and desalination system, a secondary concentration and desalination system, a concentrated water concentration and desalination system and an electrodialysis system. The precipitation system, the filtration system, the ion exchange system, the primary concentration and desalination system, the secondary concentration and desalination system, the electrodialysis system and the reuse water system are respectively provided with a water inlet and a water outlet, and the systems are connected in a manner that one end of a pipeline is connected with the water outlet and the other end is connected with the water inlet. Therefore, water flow conveying among all the systems is achieved. According to the washing water treatment system disclosed by the utility model, due to the connection mode among the systems, chemicals do not need to be added for treatment when washing water is recycled.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a washing water treatment system. Background Art

[0002] With the vigorous development of new energy vehicles, the rapid development of power batteries has been promoted. The safety and price advantages of lithium iron phosphate batteries have greatly increased the demand for iron phosphate. Iron phosphate is one of the main raw materials for the production of lithium iron phosphate batteries. The refining, recycling and reuse of iron phosphate are in full swing. Although the industry has adapted to the market demand and obtained the dividends brought by it, it also faces the problems of difficult treatment and expensive disposal of wastewater generated in the production process and material loss. Only by overcoming this problem can the lithium iron phosphate battery industry develop healthily and steadily.

[0003] Iron phosphate washing wastewater is acidic, salty, heavy, complex and difficult to treat. At present, wastewater with this characteristic is usually treated by membrane process after adding alkali or ammonia to increase pH. The main disadvantage of this process is that the membrane cannot operate stably under low pH conditions. The increase in pH makes other ions in the wastewater easy to scale and block on the membrane surface. In addition, the alkali or ammonia added to increase pH and the scale inhibitors, non-oxidizing bactericides, chemical cleaning agents, reducing agents and other agents that must be added accordingly not only increase the salt content of the entire system, increase the treatment load of the system membrane, increase the one-time investment, but also increase the cost and energy consumption of agent treatment per ton of water. Seeking a method that can not only stably treat wastewater with such characteristics, but also improve the reuse rate of the wastewater, recover materials with higher economic value, reduce the cost of new water input, and take into account the reduction of the ton water treatment cost of the wastewater without changing the characteristics of the wastewater or adjusting the quality. The application of such a highly comprehensive method is of great significance in the industry. It is a major breakthrough in the recycling and reuse of iron phosphate washing wastewater, and it is a difficult problem that needs to be overcome urgently for the thriving and steady development of the new energy manufacturing industry. Utility Model Content

[0004] In order to solve at least one problem in the above-mentioned background technology, the utility model provides a washing water treatment system.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A washing water treatment system, comprising:

[0007] A sedimentation system, which is provided with a first water inlet and a first water outlet;

[0008] A filtration system, which is provided with a second water inlet and a second water outlet, wherein the second water inlet is connected to the first water outlet through a first pipeline;

[0009] An ion exchange system, which is provided with a third water inlet and a third water outlet, wherein the third water inlet is connected to the second water outlet through a second pipeline;

[0010] A primary concentration and desalination system, which is provided with a fourth water inlet, a first fresh water outlet and a first concentrated water outlet, wherein the fourth water inlet is connected to the third water outlet via a third pipeline;

[0011] A two-stage concentration and desalination system, which is provided with a fifth water inlet, a second fresh water outlet and a second concentrated water outlet, the fifth water inlet is connected to the first fresh water outlet through a fourth pipeline, the second concentrated water outlet is connected to the fourth water inlet through a fifth pipeline and the third pipeline, and the second fresh water outlet is connected to a recycled water system through a sixth pipeline;

[0012] A concentrated water desalination system, which is provided with a sixth water inlet, a third fresh water outlet and a third concentrated water outlet, wherein the sixth water inlet is connected to the first concentrated water outlet through a seventh pipeline, and the third fresh water outlet is connected to the fifth water inlet through an eighth pipeline and the fourth pipeline;

[0013] The electrodialysis system is provided with a seventh water inlet and a fourth water outlet, wherein the seventh water inlet is connected to the third concentrated water outlet via a ninth pipeline, and the fourth water outlet is connected to the third water inlet via a tenth pipeline and the second pipeline.

[0014] According to one embodiment of the utility model, it also includes a regeneration liquid recovery system and a first dosing system;

[0015] The regeneration liquid recovery system comprises a first liquid inlet, and the first liquid inlet is connected to the regeneration liquid outlet of the ion exchange system through an eleventh pipeline;

[0016] The first dosing system is provided with a second liquid inlet and a first liquid outlet, the fourth water outlet is connected to the second liquid inlet through the tenth pipeline, and the first liquid outlet is connected to the third water inlet through the twelfth pipeline and the second pipeline.

[0017] According to one embodiment of the utility model, it also includes a second dosing system, which is provided with a second liquid outlet, and the second liquid outlet is connected to a thirteenth pipeline, a fourteenth pipeline and a fifteenth pipeline connected in parallel, the thirteenth pipeline is connected to the third liquid inlet of the first-level concentrating and desalination system, the fourteenth pipeline is connected to the fourth liquid inlet of the second-level concentrating and desalination system, and the fifteenth pipeline is connected to the fifth liquid inlet of the concentrated water concentrating and desalination system.

[0018] According to one embodiment of the utility model, the second dosing system includes an antiscalant dosing device and / or a non-oxidizing bactericide dosing device;

[0019] The liquid outlet of the antiscalant dosing device is connected in parallel with the thirteenth pipeline, the fourteenth pipeline and the fifteenth pipeline through the sixteenth pipeline;

[0020] The liquid outlet of the non-oxidizing bactericide dosing device is connected in parallel with the thirteenth pipeline, the fourteenth pipeline and the fifteenth pipeline through the seventeenth pipeline.

[0021] According to an embodiment of the utility model, it also includes a sludge treatment system, and the sludge treatment system is connected to the first sludge outlet of the sedimentation system through a seventeenth pipeline.

[0022] According to one embodiment of the utility model, the sludge treatment system includes a material recovery tank and a material drying device;

[0023] The material recovery tank is provided with a first mud inlet and a second mud outlet, and the first mud inlet is connected to the first mud outlet of the sedimentation system through the seventeenth pipeline;

[0024] The material drying device is provided with a second mud inlet, and the second mud inlet is connected to the second mud outlet through an eighteenth pipeline.

[0025] According to one embodiment of the utility model, it also includes a first water collection system, a second water collection system, a third water collection system, a fresh water collection system, a first concentrated water collection system, a second concentrated water collection system and a third concentrated water collection system;

[0026] The water inlet of the first water collection system is connected to the water outlet of the first pipeline, and the water outlet of the first water collection system is connected via the second water inlet of the nineteenth pipeline;

[0027] The water inlet of the second water collection system is connected to the water outlet of the second pipeline, and the water outlet of the second water collection system is connected to the third water inlet through the twentieth pipeline;

[0028] The water inlet of the third water collection system is connected to the water outlet of the third pipeline, and the water outlet of the third water collection system is connected to the fourth water inlet through the twenty-first pipeline;

[0029] The water inlet of the fresh water collection system is connected to the water outlet of the fourth pipeline, and the water outlet of the fresh water collection system is connected to the fifth water inlet through the twenty-second pipeline;

[0030] The water inlet of the recycled water system is connected to the water outlet of the sixth pipeline;

[0031] The water inlet of the first concentrated water collection system is connected to the water outlet of the seventh pipeline, and the water outlet of the first concentrated water collection system is connected to the sixth water inlet through the twenty-third pipeline;

[0032] The water inlet of the second concentrated water collection system is connected to the water outlet end of the ninth pipeline, and the water outlet of the second concentrated water collection system is connected to the seventh water inlet through the twenty-fourth pipeline;

[0033] The water inlet of the third concentrated water collection system is connected to the water outlet of the tenth pipeline, and the water outlet of the third concentrated water collection system is connected to the third water inlet through the twenty-fifth pipeline and the second pipeline.

[0034] According to one embodiment of the utility model, the filtration system includes a first filtration device, a second filtration device and a fourth water collection system;

[0035] The water inlet of the first filter device is connected to the water outlet end of the nineteenth pipeline, and the water outlet of the first filter device is connected to the water inlet of the fourth water collection system through the twenty-sixth pipeline;

[0036] The water outlet of the fourth water collection system is connected to the water inlet of the second filtering device through a twenty-seventh pipeline;

[0037] The water outlet of the second filtering device is connected to the water inlet end of the second pipeline.

[0038] According to one embodiment of the utility model, each of the water collection systems is connected to a lifting pump.

[0039] According to an embodiment of the present invention, the filtering accuracy of the first filtering device is 0.1-100 μm, and the filtering accuracy of the second filtering device is 10-300 nm.

[0040] According to an embodiment of the utility model, each pipeline is provided with a one-way valve.

[0041] According to an embodiment of the utility model, the sedimentation system includes a clarification zone, the clarification zone is provided with a water outlet, and the water outlet of the clarification zone is connected to the first water inlet through a twenty-eighth pipeline.

[0042] The utility model has the following beneficial effects:

[0043] 1. Through the setting of the wash water treatment system of the utility model, it is not necessary to set up MVR when treating wash water, and there is no need to add alkali solution, ammonia water, lime, etc. to adjust the pH value, which reduces the cost of neutralization alkali addition and adjustment acid addition, reduces the total dissolved solids or salts brought in by alkali and acid, and does not produce by-products (such as waste residue and waste water); reduces the dosage of scale inhibitors, does not need to add flocculants, reducing agents, and chemical cleaning agents, and greatly reduces the operating cost of the agents.

[0044] 2. The utility model adopts precipitation, filtration, adsorption, multi-stage concentration and electroosmosis to treat iron phosphate washing wastewater, which can recycle the slag and water for resource utilization. The precipitated and filtered sludge and concentrated water are analyzed and regenerated and then recycled to the production system for reuse. The final water produced is used as water for rewashing materials.

[0045] 3. The utility model recycles the sludge and water as resources, achieving 100% recycling of sludge and water. The pre-precipitated and filtered sludge and concentrated water are analyzed and regenerated and then recycled to the production system for reuse. The final produced water can be used as water for rewashing materials.

[0046] 4. The utility model realizes the production requirements of intensive land use, harmless raw materials, clean production, waste resource utilization and low-carbon energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 The utility model washing water treatment system structural schematic diagram is shown.

[0048] Figure markings: 1-raw liquid buffer tank; 2-precipitation system; 3-first water collection system; 4-first filtering device; 5-fourth water collection system; 6-second filtering device; 7-second water collection system; 8-ion exchange system; 9-regeneration liquid recovery system; 10-third water collection system; 11-primary concentration and desalination system; 12-first concentrated water collection system; 13-concentrated water concentration and desalination system; 14-second concentrated water collection system; 15-electrodialysis system; 16-third concentrated water collection system; 17-fresh water collection system; 18-secondary concentration and desalination system; 19-recycled water system; 20-material recovery tank; 21-material drying device; 22-scaling inhibitor dosing device; 23-non-oxidizing bactericide dosing device; 24-first dosing system. DETAILED DESCRIPTION

[0049] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0050] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0051] Specifically, Figure 1 As shown, this embodiment provides a washing water treatment system, comprising:

[0052] A sedimentation system 2, which is provided with a first water inlet and a first water outlet;

[0053] A filtration system, which is provided with a second water inlet and a second water outlet, the second water inlet is connected to the first water outlet through a first pipeline;

[0054] an ion exchange system 8, which is provided with a third water inlet and a third water outlet, the third water inlet being connected to the second water outlet via a second pipeline;

[0055] The first-stage concentration and desalination system 11 is provided with a fourth water inlet, a first fresh water outlet and a first concentrated water outlet, and the fourth water inlet is connected to the third water outlet through a third pipeline;

[0056] The secondary concentration and desalination system 18 is provided with a fifth water inlet, a second fresh water outlet and a second concentrated water outlet. The fifth water inlet is connected to the first fresh water outlet through a fourth pipeline, the second concentrated water outlet is connected to the fourth water inlet through a fifth pipeline and a third pipeline, and the second fresh water outlet is connected to a recycled water system 19 through a sixth pipeline.

[0057] The concentrated water desalination system 13 is provided with a sixth water inlet, a third fresh water outlet and a third concentrated water outlet, the sixth water inlet is connected to the first concentrated water outlet through a seventh pipeline, and the third fresh water outlet is connected to the fifth water inlet through an eighth pipeline and a fourth pipeline;

[0058] The electrodialysis system 15 is provided with a seventh water inlet and a fourth water outlet, the seventh water inlet is connected to the third concentrated water outlet through a ninth pipeline, and the fourth water outlet is connected to the third water inlet through a tenth pipeline and the second pipeline;

[0059] When carrying out this embodiment, the sedimentation system 2, the filtration system, the ion exchange system 8, the primary concentration and desalination system 11, the secondary concentration and desalination system 14, the electrodialysis system 15 and the recycled water system 19 are all provided with a water inlet and a water outlet. The connection method between each system is to connect the water outlet at one end of the pipeline and the water inlet at the other end. According to this connection method, water flow transportation between each system is realized. The washing water treatment system is provided with a water collection system between each water treatment system. Each water collection system is connected with a lifting pump, and the lifting pump can be connected to the water inlet and / or water outlet of each pipeline. Through the setting of the lifting pump, the working efficiency of water transportation is accelerated, and when water is pumped into the filtration system and the concentration system, an impact effect is formed on the filtration system and the concentration system, thereby improving the filtration rate. The water collection system stores water transported by the upstream water treatment system, and the water collection system then supplies water to the downstream water treatment system.

[0060] Specifically, a first water collection system 3 is provided between the sedimentation system 2 and the filtration system, the clarified water in the sedimentation system 2 is stored in the first water collection system 3, and the water in the first water collection system 3 is pumped into the filtration system through a 0.35MPa lifting pump. A second water collection system 7 is provided between the filtration system and the ion exchange system 8, the fresh water produced by the filtration system is stored in the second water collection system 7, and the water in the second water collection system 7 is pumped into the ion exchange system 8 through a 0.35MPa lifting pump. A third water collection system 10 is provided between the ion exchange system 8 and the primary concentration and desalination system 11, the fresh water produced by the ion exchange is stored in the third water collection system 10, the water in the third water collection system 10 is lifted by a 0.35MPa lifting pump, and is pressurized and pumped into the primary concentration and desalination system 11 through a 1.3MPa high-pressure pump. A first freshwater collection system 17 is provided between the primary concentrated desalination system 11 and the secondary concentrated desalination system 18 and the concentrated water concentrated desalination system 13. The fresh water produced by the primary concentrated desalination system 11 and the concentrated water concentrated desalination system 13 is stored in the first freshwater collection system 17. The water in the first freshwater collection system 17 is lifted by a 0.35MPa lifting pump and is pressurized and pumped into the secondary concentrated desalination system 18 by a 1.0MPa high-pressure pump. The secondary concentrated desalination system 18 is provided with a recycled water system 19. The fresh water produced by the secondary concentrated desalination is stored in the recycled water system 19, and the concentrated water produced by the secondary concentrated desalination system 18 is stored in the third collection system 10. A first concentrated water collection system 12 is arranged between the primary concentrating and desalination system 11 and the concentrated water concentrating and desalination system 13. The concentrated water produced by the primary concentrating and desalination system 11 is stored in the first concentrated water collection system 12. The water in the first concentrated water collection system 12 is lifted by a 0.35MPa lifting pump and is pressurized and pumped into the concentrated water concentrating and desalination system 13 by a 2.0MPa high-pressure pump. A second concentrated water collection system 14 is arranged between the concentrated water concentrating and desalination system 13 and the electrodialysis system 15. The concentrated water produced by the concentrated water concentrating and desalination system 13 is stored in the second concentrated water collection system 14. The water in the second concentrated water collection system 14 is pumped into the electrodialysis system 15 by a 0.25MPa lifting pump. The electrodialysis system 15 is provided with a third concentrated water collection system 16. The concentrated water produced by the electrodialysis system 15 is stored in the third concentrated water collection system 16. The water in the third concentrated water collection system 16 returns to the ion exchange system 8. The fresh water produced by the electrodialysis system 15 is stored in the first concentrated water collection system 12. Each of the above-mentioned water collection systems is provided with a water inlet and a water outlet corresponding to the system connected thereto. By setting up the water collection system, a better water circulation effect is achieved.

[0061] The specific connection methods between the water collection system and various systems, pipelines, water inlets and outlets include:

[0062] The water inlet of the first water collection system 3 is connected to the water outlet of the first pipeline, and the water outlet of the first water collection system 3 is connected to the second water inlet of the nineteenth pipeline;

[0063] The water inlet of the second water collection system 7 is connected to the water outlet of the second pipeline, and the water outlet of the second water collection system 7 is connected to the third water inlet through the twentieth pipeline;

[0064] The water inlet of the third water collection system 10 is connected to the water outlet of the third pipeline, and the water outlet of the third water collection system 10 is connected to the fourth water inlet through the twenty-first pipeline;

[0065] The water inlet of the fresh water collection system 17 is connected to the water outlet of the fourth pipeline, and the water outlet of the fresh water collection system 17 is connected to the fifth water inlet through the twenty-second pipeline;

[0066] The water inlet of the recycled water system 19 is connected to the water outlet of the sixth pipeline;

[0067] The water inlet of the first concentrated water collection system 12 is connected to the water outlet of the seventh pipeline, and the water outlet of the first concentrated water collection system 12 is connected to the sixth water inlet through the twenty-third pipeline;

[0068] The water inlet of the second concentrated water collection system 14 is connected to the water outlet of the ninth pipeline, and the water outlet of the second concentrated water collection system 14 is connected to the seventh water inlet through the twenty-fourth pipeline;

[0069] The water inlet of the third concentrated water collection system 16 is connected to the water outlet of the tenth pipeline, and the water outlet of the third concentrated water collection system 16 is connected to the third water inlet through the twenty-fifth pipeline and the second pipeline.

[0070] In this embodiment, the fresh water recovery rate is improved, the recovery efficiency is improved, and the production cost is reduced by setting and connecting the precipitation system 2, the filtration system, the ion exchange system 8, the primary concentration and desalination system 11, the secondary concentration and desalination system 18, the concentrated water concentration and desalination system 13 and the electrodialysis system 15. The present embodiment realizes the requirements of intensive land use, harmless raw materials, clean production, waste resource utilization, and low-carbon energy. Through the setting of the water collection system, it is convenient to store water and promote water circulation. Through the setting of the wash water treatment system of this embodiment, it is not necessary to set up MVR when treating wash water, and no alkali solution, ammonia water, lime, etc. are added to adjust the pH value, which reduces the cost of neutralization and alkali addition, callback and acid addition, reduces the total dissolved solids or salts brought in by alkali and acid, and does not produce by-products (such as waste residue and wastewater); reduces the dosage of scale inhibitors, does not need to add flocculants, reducing agents, and chemical cleaning agents, and greatly reduces the operating cost of the agents.

[0071] In some embodiments, the filtration system, the first-level concentrating and desalination system 11, the second-level concentrating and desalination system 18 and the concentrated water concentrating and desalination system 13 are connected to the membrane flushing device. The special acidic anti-pollution reverse osmosis membrane used in the first-level concentrating and desalination system 11, the second-level concentrating and desalination system 18 and the concentrated water concentrating and desalination system 13 is not easy to scale or cause membrane fouling because it operates under acidic conditions. Therefore, no chemical cleaning device is required. Only the filter element and membrane element of the filtration system need to be reversely flushed at a low pressure of 0.35 MPa, and the reverse osmosis membrane elements of each concentrating and desalination system need to be forwardly flushed at a high pressure of 2.0 MPa, so that the cleaning purpose can be achieved without adding any medicine.

[0072] In some embodiments, the iron phosphate washing water is stored in the stock solution buffer tank 1. The iron phosphate washing water is low-salt washing water produced during the preparation of the iron phosphate material. The characteristics of the washing water are:

[0073] pH=1.5-3, conductivity ≤5000us / cm, main impurity is NiSO4, maximum inlet salinity ≤2g / L, suspended solids ≤500mg / L, Ni ≤600mg / L, Fe ≤100mg / L, P ≤100mg / L, Ca ≤6mg / L, Mg ≤2mg / L, F ≤10mg / L, Cl ≤10mg / L, water temperature ≤35℃, oil content ≤0.5mg / L, suspended solids particle size distribution: 0.10-30.0μm.

[0074] Specifically, the iron phosphate washing wastewater in the raw liquid buffer tank 11 is 625m 3 / h enters the sedimentation system 2 step for sedimentation system 2 treatment, and the clarified liquid after the sedimentation system 2 treatment is treated by the filtration system; the turbidity of the water produced by the filtration system treatment is ≤0.5NTU, SDI ≤3, and the fresh water recovery rate is ≥90%. The water produced by the filtration system is then sent to the ion exchange system 8 for treatment.

[0075] The fresh water recovery rate of the ion exchange system 8 is ≥98%, and the fresh water output of the ion exchange system 8 is 624.2m 3 / h, the fresh water quality after the ion exchange system 8 is pH = 3, total dissolved solids or salt ≤ 1300mg / L, Ni ≤ 1mg / L, Fe ≤ 1mg / L, Ca ≤ 1mg / L, Mg ≤ 1mg / L, P ≤ 99mg / L, SO4 2- ≤110mg / L. The fresh water produced by the ion exchange system 8 enters the primary concentration and desalination system 11 for treatment. The concentrated water produced by the ion exchange system 8 is mixed with 8% dilute sulfuric acid and analyzed and regenerated by the ion exchange system 8 to recover nickel sulfate and iron sulfate in the regenerated liquid.

[0076] The fresh water recovery rate obtained by the primary concentration and desalination system 11 is ≥80%, and the desalination rate is ≥95%. The concentrated water quality after the primary concentration and desalination system 11 is pH1.15, total dissolved solids or salt ≤6096mg / L, Ni≤5mg / L, Fe≤5.5mg / L, P≤468mg / L, Ca≤4.8mg / L, Mg≤5.2mg / L, F≤44mg / L, Cl≤41mg / L, SO4 2- ≤5150mg / L. Fresh water quality is pH3.5, total dissolved solids or salt ≤63.5mg / L, Ni≤0.1mg / L, Fe≤0.1mg / L, P≤2.9mg / L, Ca≤0.1mg / L, Mg≤0.1mg / L, F≤0.5mg / L, Cl≤0.5mg / L, SO4 2- ≤53.7mg / L. The fresh water output of the primary concentration and desalination system 11 is 554m 3 / h, the concentrated water output of the primary concentration and desalination system 11 is 138.4m 3 / h, the fresh water obtained by the primary concentration and desalination system 11 enters the secondary concentration and desalination system 18 for treatment, and the concentrated water obtained by the primary concentration and desalination system 11 enters the concentrated water concentration and desalination system 13 for treatment.

[0077] The fresh water recovery rate of the concentrated water desalination system 13 is ≥72%, and the desalination rate is ≥95%. The concentrated water quality after being treated by the concentrated water desalination system 13 is pH0.5, total dissolved solids or salt ≤23994mg / L, Ni≤11.8mg / L, Fe≤15.2mg / L, P≤1637mg / L, Ca≤15.6mg / L, Mg≤16.2mg / L, F≤165.4mg / L, Cl≤163.5mg / L, SO4 2- ≤20289mg / L. Fresh water quality is pH3, total dissolved solids or salt ≤348.5mg / L, Ni ≤0.2mg / L, Fe ≤0.1mg / L, P ≤23.8mg / L, Ca ≤0.3mg / L, Mg ≤0.2mg / L, F ≤2.3mg / L, Cl ≤2.2mg / L, SO4 2- ≤294.6mg / L. The fresh water output of concentrated water desalination system 13 is 128.4m 3 / h, the concentrated water production of the concentrated water desalination system 13 is 50m 3 / h, the fresh water obtained by the concentrated water desalination system 13 enters the secondary concentrated water desalination system 18 for treatment, and the concentrated water obtained by the concentrated water desalination system 13 enters the electrodialysis system 15 for treatment.

[0078] The concentrated water quality after being treated by the electrodialysis system 15 is pH 0.09, total dissolved solids or salt ≤ 80078 mg / L, Ni ≤ 31.3 mg / L, Fe ≤ 63.5 mg / L, P ≤ 6193 mg / L, Ca ≤ 62.6 mg / L, Mg ≤ 64.3 mg / L, F ≤ 624.8 mg / L, Cl ≤ 626.9 mg / L, SO4 2- ≤67692mg / L. Fresh water quality is pH1, total dissolved solids or salt ≤10000mg / L, Ni ≤4.5mg / L, Fe ≤5.2mg / L, P ≤500mg / L, Ca ≤5.1mg / L, Mg ≤4.9mg / L, F ≤49.3mg / L, Cl ≤51.6mg / L, SO4 2- ≤8461mg / L. The fresh water output of electrodialysis system 15 is 40m 3 / h, the concentrated water output of the electrodialysis system 15 is 10m 3 / h, the fresh water obtained by the electrodialysis system 15 enters the concentrated water desalination system 13 for treatment, and the concentrated water obtained by the electrodialysis system 15 is treated by the ion exchange system 8. The electrodialysis system 15 forms anion and cation two-stages under the action of direct current, and the cations and anions migrate forward to the two stages respectively to achieve the purpose of ion re-concentration and separation.

[0079] The fresh water recovery rate of the secondary concentrated water desalination system 13 is ≥95%, and the desalination rate is ≥92%. The quality of the concentrated water after being treated by the secondary concentrated water desalination system 13 is pH1.7, total dissolved solids or salt ≤992mg / L, Ni≤1.1mg / L, Fe≤0.9mg / L, P≤59.1mg / L, Ca≤0.9mg / L, Mg≤1.2mg / L, F≤7.9mg / L, Cl≤8.5mg / L, SO4 2- ≤828mg / L; fresh water quality is pH3, conductivity ≤10us / cm, total dissolved solids or salt ≤20mg / L, Ni=0mg / L, Fe=0mg / L, P≤0.9mg / L, Ca=0mg / L, Mg=0mg / L, F=0mg / L, Cl=0mg / L, SO4 2- ≤18.3mg / L, the water recovery rate of the whole system is ≥95%. The fresh water volume of the secondary concentration and desalination system 18 is 614.2m 3 / h, the concentrated water output of the secondary concentration and desalination system 18 is 68.2m 3 / h. The fresh water obtained by the secondary concentration and desalination system 18 is the final produced water. The concentrated water obtained by the secondary concentration and desalination system 18 enters the primary concentration and desalination system 11 for treatment. The final produced water of this embodiment is used as the raw water for iron phosphate washing water.

[0080] The fresh water output per unit time period after treatment by the primary concentration and desalination system 11, the secondary concentration and desalination system 18, the concentrated water concentration and desalination system 13 and the electrodialysis system 15 of this embodiment is higher than the concentrated water output, and the fresh water output of the primary concentration and desalination system 11, the secondary concentration and desalination system 18 and the concentrated water concentration and desalination system 13 is much higher than the concentrated water output, indicating that the wastewater treatment method of this embodiment is effective, has a very high recovery rate, and improves work efficiency. The setting of the system of this embodiment makes it unnecessary to add reagents and adjust pH, which greatly reduces production costs.

[0081] According to one embodiment of the utility model, Figure 1 As shown, it also includes a regeneration liquid recovery system 9 and a first dosing system 24;

[0082] The regeneration liquid recovery system 9 comprises a first liquid inlet, which is connected to the regeneration liquid outlet of the ion exchange system 8 through an eleventh pipeline;

[0083] The first dosing system 24 is provided with a second liquid inlet and a first liquid outlet, the fourth liquid outlet is connected to the second liquid inlet through a tenth pipeline, and the first liquid outlet is connected to the third liquid inlet through a twelfth pipeline and the second pipeline.

[0084] In this embodiment, the concentrated water produced by the electrodialysis system 15 enters the first dosing system 24. The regeneration agent in the first dosing system 24 is mixed with the concentrated water to form a 22.5m 3 / h enters the ion exchange system 8 for analytical regeneration, producing 22.5m 3 / h regeneration liquid, regeneration liquid pH 0.088, Ni ≤ 17000mg / L, Fe ≤ 2830mg / L, Ca ≤ 169mg / L, Mg ≤ 56mg / L, SO4 2- ≤104000mg / L, the regeneration liquid in the ion exchange system 8 enters the regeneration liquid recovery system 9, so as to facilitate the subsequent process of recovering iron phosphate, nickel sulfate and iron sulfate in the regeneration liquid, further improving economic benefits. And the concentrated water after recovering nickel sulfate and iron sulfate in the regeneration liquid can achieve the purpose of zero discharge of concentrated water, so as to improve green production.

[0085] In some embodiments, in the concentrated water produced by the electrodialysis system 15, the amount of dilute acid added is ≥ 80 g / L.

[0086] In some embodiments, the regeneration agent comprises a dilute acid.

[0087] In this embodiment, dilute acid is used as a regeneration agent. The dilute acid can be used as a decomposition liquid for the adsorption material to decompose nickel and iron in the adsorption material, thereby recovering iron phosphate, nickel sulfate and iron sulfate, thereby further improving economic benefits.

[0088] In some embodiments, dilute acids include, but are not limited to, dilute hydrochloric acid and dilute sulfuric acid.

[0089] According to one embodiment of the utility model, Figure 1 As shown, it also includes a second dosing system, which is provided with a second liquid outlet, and the second liquid outlet is connected to a thirteenth pipeline, a fourteenth pipeline and a fifteenth pipeline which are connected in parallel, the thirteenth pipeline is connected to the third liquid inlet of the primary concentration and desalination system 11, the fourteenth pipeline is connected to the fourth liquid inlet of the secondary concentration and desalination system 18, and the fifteenth pipeline is connected to the fifth liquid inlet of the concentrated water concentration and desalination system 13.

[0090] In this embodiment, through the setting of the second dosing system, scale inhibitors and / or non-oxidizing bactericides 23 can be provided for the primary concentrated desalination system 11, the secondary concentrated desalination system 18 and the concentrated water desalination system 13, which can inhibit scale formation or perform sterilization treatment on the primary concentrated desalination system 11, the secondary concentrated desalination system 1818 and the concentrated water desalination system 13.

[0091] According to one embodiment of the utility model, Figure 1 As shown, the second dosing system includes an antiscalant dosing device 22 and / or a non-oxidizing bactericide dosing device 23;

[0092] The liquid outlet of the antiscalant dosing device 22 is connected in parallel with the thirteenth pipeline, the fourteenth pipeline and the fifteenth pipeline through the sixteenth pipeline;

[0093] The liquid outlet of the non-oxidizing bactericide dosing device 23 is connected in parallel with the thirteenth pipeline, the fourteenth pipeline and the fifteenth pipeline through the seventeenth pipeline.

[0094] In this embodiment, the scale inhibitor dosing device 22 and the non-oxidizing bactericide dosing device 23 can simultaneously inhibit scale formation or perform sterilization treatment on the primary concentrated desalination system 11, the secondary concentrated desalination system 18 and the concentrated water concentrated desalination system 13, or inhibit scale formation or perform sterilization treatment separately.

[0095] According to one embodiment of the utility model, Figure 1 As shown, it also includes a sludge treatment system, which is connected to the first sludge outlet of the sedimentation system 2 through a seventeenth pipeline;

[0096] The sludge treatment system includes a material recovery tank 20 and a material drying device 21;

[0097] The material recovery tank 20 is provided with a first mud inlet and a second mud outlet, and the first mud inlet is connected to the first mud outlet 2 of the sedimentation system through a seventeenth pipeline;

[0098] The material drying device 21 is provided with a second mud inlet, and the second mud inlet is connected to the second mud outlet through an eighteenth pipeline.

[0099] In this embodiment, the sedimentation system 2 removes suspended matter after treating water, and sends the mud residue produced by the sedimentation to the material recovery tank 20. Then, the material drying device 21 uses a pressure of ≤1.2MPa to dry the mud residue, and the iron phosphate contained in the dry mud can be recovered later to improve economic benefits. The liquid produced by the drying treatment can be filtered later to further improve the water recovery rate.

[0100] In this embodiment, the ferric phosphate washing water is treated in combination with the precipitation system 2, the filtration system, the ion exchange system 8 adsorption, the multi-stage concentration system and the electrodialysis system 15, so that the slag and water can be recycled and utilized as resources, and the precipitated and filtered sludge and concentrated water are analyzed and regenerated and recycled to the production system for reuse, and the final produced water can be used as water for rewashing materials.

[0101] In some embodiments, after the iron phosphate wash water is treated by the precipitation system, the iron phosphate wash water can be increased from SS ≤ 500 mg / L to SS ≤ 100 mg / L.

[0102] According to one embodiment of the utility model, Figure 1 As shown, the filtration system includes a first filtration device 4, a second filtration device 6 and a fourth water collection system 5;

[0103] The water inlet of the first filter device 4 is connected to the water outlet end of the nineteenth pipeline, and the water outlet of the first filter device 4 is connected to the water inlet of the fourth water collection system 5 through the twenty-sixth pipeline;

[0104] The water outlet of the fourth water collection system 5 is connected to the water inlet of the second filtering device 6 through the twenty-seventh pipeline;

[0105] The water outlet of the second filtering device 6 is connected to the water inlet end of the second pipeline.

[0106] In this embodiment, the first filter device 4 and the second filter device 6 are both provided with a water inlet and a water outlet, and a fourth water collection system 55 is provided between the first filter device 4 and the second filter device 6. The fresh water produced by the first filter device 4 is stored in the fourth water collection system 5. The water in the fourth water collection system 5 is pumped into the second filter device 6 by a 0.35MPa lifting pump, and the fresh water produced by the second filter device 6 is stored in the second water collection system 7. The fourth water collection system 5 is also provided with a water inlet and a water outlet. The water SS in the fourth water collection system 5 is ≤5mg / L, and the water SS in the second water collection system is ≤0.5mg / L.

[0107] In some embodiments, the filtering accuracy of the first filtering device 4 is 0.1-100 μm, and the filtering accuracy of the second filtering device 6 is 10-300 nm. The two filtering devices are used together to increase the purity of the filtered water and improve the requirements for the water quality of the produced water.

[0108] In this embodiment, the clarified liquid after the sedimentation system 2 is processed by the first filter device 4 and the second filter device 6 in sequence. The filtration accuracy of the first filter device 4 is 1 μm, the SS of the water produced by the first filter device 4 is ≤ 5 mg / L, and the water intake is 710.5 m 3 / h, water output is 707.7m 3 / h, mud production is 0.8m 3 / h, backwash water volume is 2m 3 / h. The precision of the second filter device 6 is 300nm, the SS of the water produced by the second filter device 6 is ≤0.5mg / L, and the water intake of the second filter device 6 is 707.7m 3 / h, water output is 636.9m 3 / h, the water consumption is 70.8m 3 / h, water turbidity ≤0.5NTUmg / L, SDI ≤3mg / L, recovery rate ≥90%, and two filtrations are performed to improve the purity of the produced water. The sludge produced during the filtration process can be subsequently dried and recycled. The water quality after two filtrations is pH3, total dissolved solids or salt ≤2000mg / L, SS ≤0.5mg / L, Ni ≤600mg / L, Fe ≤100mg / L, P ≤100mg / L, Ca ≤6mg / L, Mg ≤2mg / L, F ≤10mg / L, Cl ≤10mg / L, SO4 2- ≤1100mg / L.

[0109] In some embodiments, the first water collection system 3 is provided with a backwash water inlet of the first filter device 4, a consumable water inlet of the second filter device 6, a backwash water inlet of the ion exchange system 8 and a filtrate inlet of the sludge treatment system.

[0110] According to an embodiment of the present utility model, which is not shown in the figure, each pipeline is provided with a one-way valve.

[0111] In this embodiment, the one-way valve is provided to ensure that the water flow direction of each pipeline remains unchanged to avoid backflow and affect the operation of each water treatment system.

[0112] According to an embodiment of the present utility model, the sedimentation system 2 includes a clarification zone, the clarification zone is provided with a water outlet, and the water outlet of the clarification zone is connected to the first water inlet through a twenty-eighth pipeline.

[0113] In this embodiment, the setting of the clarification zone facilitates the clean water produced by the sedimentation system 2 to enter the filtration system for filtration, thereby preventing interference from the settled sludge.

[0114] In some embodiments, the filtration membranes used in the filtration system, the primary concentration and desalination system 11, the secondary concentration and desalination system 18 and the concentrated water concentration and desalination system 13 are membranes for use under pH 1-3 conditions.

[0115] In this embodiment, the filtration system, the primary concentration and desalination system 11, the secondary concentration and desalination system 18 and the concentrated water concentration and desalination system 13 process the wash water under the acidic condition of pH 1-3, which reduces the cost of adding alkali for neutralization and adding acid for callback, and reduces the total dissolved solids or salts brought in by alkali and acid. In the process of the filtration system, the primary concentration and desalination system 11, the secondary concentration and desalination system 18 and the concentrated water concentration and desalination system 13, the devices involved are not easy to scale and are not easy to cause fouling and blockage of the devices, and the use of chemical cleaning agents can be avoided.

[0116] The foregoing description of the implementation of the present invention has been given for the purpose of illustration and description. The foregoing description is not exhaustive nor is it intended to limit the present invention to the exact form disclosed, and various variations and modifications may exist according to the above teachings or may be obtained from the practice of the present invention. These embodiments are selected and described in order to illustrate the principles of the present invention and its practical application, so that those skilled in the art can utilize the present invention in various embodiments and various modifications suitable for the specific purpose conceived.

Claims

1. A washing water treatment system, characterized in that: include: A sedimentation system, which is provided with a first water inlet and a first water outlet; A filtration system, which is provided with a second water inlet and a second water outlet, wherein the second water inlet is connected to the first water outlet through a first pipeline; An ion exchange system, which is provided with a third water inlet and a third water outlet, wherein the third water inlet is connected to the second water outlet through a second pipeline; A primary concentration and desalination system, which is provided with a fourth water inlet, a first fresh water outlet and a first concentrated water outlet, wherein the fourth water inlet is connected to the third water outlet via a third pipeline; A two-stage concentration and desalination system, which is provided with a fifth water inlet, a second fresh water outlet and a second concentrated water outlet, the fifth water inlet is connected to the first fresh water outlet through a fourth pipeline, the second concentrated water outlet is connected to the fourth water inlet through a fifth pipeline and the third pipeline, and the second fresh water outlet is connected to a recycled water system through a sixth pipeline; A concentrated water desalination system, which is provided with a sixth water inlet, a third fresh water outlet and a third concentrated water outlet, wherein the sixth water inlet is connected to the first concentrated water outlet through a seventh pipeline, and the third fresh water outlet is connected to the fifth water inlet through an eighth pipeline and the fourth pipeline; The electrodialysis system is provided with a seventh water inlet and a fourth water outlet, wherein the seventh water inlet is connected to the third concentrated water outlet via a ninth pipeline, and the fourth water outlet is connected to the third water inlet via a tenth pipeline and the second pipeline.

2. A washing water treatment system according to claim 1, characterized in that: It also includes a regeneration liquid recovery system and a first dosing system; The regeneration liquid recovery system comprises a first liquid inlet, and the first liquid inlet is connected to the regeneration liquid outlet of the ion exchange system through an eleventh pipeline; The first dosing system is provided with a second liquid inlet and a first liquid outlet, the fourth water outlet is connected to the second liquid inlet through the tenth pipeline, and the first liquid outlet is connected to the third water inlet through the twelfth pipeline and the second pipeline.

3. A washing water treatment system according to claim 1, characterized in that: It also includes a second dosing system, which is provided with a second liquid outlet, and the second liquid outlet is connected to a thirteenth pipeline, a fourteenth pipeline and a fifteenth pipeline which are connected in parallel, the thirteenth pipeline is connected to the third liquid inlet of the primary concentrating and desalination system, the fourteenth pipeline is connected to the fourth liquid inlet of the secondary concentrating and desalination system, and the fifteenth pipeline is connected to the fifth liquid inlet of the concentrated water concentrating and desalination system.

4. A washing water treatment system according to claim 3, characterized in that: The second dosing system includes an antiscalant dosing device and / or a non-oxidizing bactericide dosing device; The liquid outlet of the antiscalant dosing device is connected in parallel with the thirteenth pipeline, the fourteenth pipeline and the fifteenth pipeline through the sixteenth pipeline; The liquid outlet of the non-oxidizing bactericide dosing device is connected in parallel with the thirteenth pipeline, the fourteenth pipeline and the fifteenth pipeline through the seventeenth pipeline.

5. A washing water treatment system according to claim 1, characterized in that: It also includes a sludge treatment system, which is connected to the first sludge outlet of the sedimentation system through a seventeenth pipeline.

6. A washing water treatment system according to claim 5, characterized in that: The sludge treatment system includes a material recovery tank and a material drying device; The material recovery tank is provided with a first mud inlet and a second mud outlet, and the first mud inlet is connected to the first mud outlet of the sedimentation system through the seventeenth pipeline; The material drying device is provided with a second mud inlet, and the second mud inlet is connected to the second mud outlet through an eighteenth pipeline.

7. A washing water treatment system according to claim 1, characterized in that: Also includes a first water collection system, a second water collection system, a third water collection system, a fresh water collection system, a first concentrated water collection system, a second concentrated water collection system and a third concentrated water collection system; The water inlet of the first water collection system is connected to the water outlet of the first pipeline, and the water outlet of the first water collection system is connected via the second water inlet of the nineteenth pipeline; The water inlet of the second water collection system is connected to the water outlet of the second pipeline, and the water outlet of the second water collection system is connected to the third water inlet through the twentieth pipeline; The water inlet of the third water collection system is connected to the water outlet of the third pipeline, and the water outlet of the third water collection system is connected to the fourth water inlet through the twenty-first pipeline; The water inlet of the fresh water collection system is connected to the water outlet of the fourth pipeline, and the water outlet of the fresh water collection system is connected to the fifth water inlet through the twenty-second pipeline; The water inlet of the recycled water system is connected to the water outlet of the sixth pipeline; The water inlet of the first concentrated water collection system is connected to the water outlet of the seventh pipeline, and the water outlet of the first concentrated water collection system is connected to the sixth water inlet through the twenty-third pipeline; The water inlet of the second concentrated water collection system is connected to the water outlet end of the ninth pipeline, and the water outlet of the second concentrated water collection system is connected to the seventh water inlet through the twenty-fourth pipeline; The water inlet of the third concentrated water collection system is connected to the water outlet of the tenth pipeline, and the water outlet of the third concentrated water collection system is connected to the third water inlet through the twenty-fifth pipeline and the second pipeline.

8. A washing water treatment system according to claim 7, characterized in that: The filtration system comprises a first filtration device, a second filtration device and a fourth water collection system; The water inlet of the first filter device is connected to the water outlet end of the nineteenth pipeline, and the water outlet of the first filter device is connected to the water inlet of the fourth water collection system through the twenty-sixth pipeline; The water outlet of the fourth water collection system is connected to the water inlet of the second filtering device through a twenty-seventh pipeline; The water outlet of the second filtering device is connected to the water inlet end of the second pipeline.

9. A washing water treatment system according to claim 8, characterized in that: Each of the water collection systems is connected to a lifting pump.

10. A washing water treatment system according to claim 8, characterized in that: The filtering accuracy of the first filtering device is 0.1-100 μm, and the filtering accuracy of the second filtering device is 10-300 nm.

11. A washing water treatment system according to claim 8, characterized in that: Each pipeline is provided with a one-way valve.

12. A washing water treatment system according to claim 1, characterized in that: The sedimentation system comprises a clarification zone, the clarification zone is provided with a water outlet, and the water outlet of the clarification zone is connected to the first water inlet through a twenty-eighth pipeline.

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