CN112830618A - Many grades of salt purification processing system of chlor-alkali trade waste water - Google Patents
Many grades of salt purification processing system of chlor-alkali trade waste water Download PDFInfo
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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
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/14—Purification
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/16—Purification
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- 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
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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
- 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
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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
- 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
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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
- 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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
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- 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
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Abstract
The invention discloses a multi-stage salt purification treatment system for wastewater in the chlor-alkali industry, which comprises an adjusting tank, wherein: the method comprises the following steps of enabling the chlor-alkali wastewater to enter a pretreatment unit through an adjusting tank, enabling the pretreatment unit to remove solid particles and suspended matters in the chlor-alkali wastewater and carrying out COD treatment on the chlor-alkali wastewater, enabling the pretreatment unit to be connected with an anti-pollution pressure type ultrafiltration system, enabling the anti-pollution pressure type ultrafiltration system to be connected with a primary nanofiltration salt separation system, enabling the primary nanofiltration salt separation system to separate the chlor-alkali wastewater into monovalent sodium chloride concentrated water and divalent sodium sulfate concentrated water, utilizing selective permeability of nanofiltration membranes to different ions, dividing the wastewater into monovalent sodium chloride concentrated water and divalent sodium sulfate concentrated water, simultaneously carrying out technological design on multi-stage salt separation, improving the salt separation purity, and finally carrying out crystallization to obtain industrial-grade standard sodium chloride and sodium sulfate.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a multi-stage salt purification treatment system for wastewater in the chlor-alkali industry.
Background
With increasingly strict environmental requirements and increasingly lack of water resources, zero discharge technologies such as membrane separation, evaporative crystallization and the like are gradually started, and zero discharge of wastewater is gradually promoted. However, the wastewater has the characteristics of high salt content, high hardness, complex components, great treatment difficulty and the like. The treatment of the waste water is not thorough enough, which can cause waste of water resources and environmental pollution, and the cost of the waste water treatment is higher.
At present, the wastewater treatment process in the chlor-alkali industry only realizes zero discharge of liquid, soluble inorganic salt, organic matter and the like contained in the wastewater are evaporated and crystallized out as mixed miscellaneous salt, and because the inorganic salt, the organic matter, the heavy metal and the like in the wastewater are doped with each other, the treatment is very complex, the influence on environmental pollution is large due to improper treatment, and meanwhile, the cost of later-stage hazardous wastewater treatment is increased.
Disclosure of Invention
The invention aims to provide a multi-stage salt purification treatment system for wastewater in the chlor-alkali industry, which solves the problems of incomplete salt separation of mixed salt generated in the wastewater treatment process, environmental pollution and the like.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a many grades of salt purification processing system of chlor-alkali industry waste water, includes the equalizing basin, wherein:
the chlor-alkali wastewater enters a pretreatment unit through a regulating tank, and the pretreatment unit can remove solid particles and suspended matters in the chlor-alkali wastewater and carry out COD treatment on the chlor-alkali wastewater;
one side of the pretreatment unit is connected with a sludge concentration and filter pressing system, and the sludge concentration and filter pressing system is connected with the regulating tank through a pipeline;
the pretreatment unit is connected with an anti-pollution pressure type ultrafiltration system, the anti-pollution pressure type ultrafiltration system is connected with a primary nanofiltration salt separation system, and the primary nanofiltration salt separation system can separate chlor-alkali wastewater into monovalent sodium chloride concentrated water and divalent sodium sulfate concentrated water;
the primary nanofiltration salt separation system is connected with the primary RO desalination system and the secondary RO desalination system;
the primary RO desalting system is connected with the secondary nanofiltration salt separating system, and the secondary nanofiltration salt separating system can further separate the chlor-alkali wastewater into monovalent sodium chloride concentrated water and bivalent sodium sulfate concentrated water;
the secondary nanofiltration salt separation system is connected with the primary DTRO concentration system and the secondary DTRO concentration system, and the secondary RO desalination system is connected with the secondary DTRO concentration system;
the primary DTRO concentration system is connected with the primary evaporative crystallization system, and the secondary DTRO concentration system is connected with the secondary evaporative crystallization system.
Preferably, the primary RO desalination system and the primary DTRO concentration system are connected with the primary produced water recycling water tank, and the secondary RO desalination system and the secondary DTRO concentration system are connected with the secondary produced water recycling water tank.
Preferably, the pretreatment unit comprises a softening reaction tank connected with an adjusting tank, the softening reaction tank is connected with an intermediate water tank, the intermediate water tank is connected with a medium filter, the medium filter is connected with an ozone contact tank, and the ozone contact tank is connected with an anti-pollution pressure type ultrafiltration system;
softening reaction pond one side and passing through the pipeline and be connected with sludge concentration filter-pressing system, just sludge concentration filter-pressing system lower extreme is provided with mud outward transport system.
Preferably, the anti-pollution pressure type ultrafiltration system is a circulating ultrafiltration membrane.
Preferably, the primary nanofiltration salt separation system is a rolled nanofiltration membrane component, and the water production end of the primary nanofiltration salt separation system is connected with the primary RO desalination system and the secondary RO desalination system.
Preferably, the primary RO desalination system is a low-pressure reverse osmosis membrane module, the water production end of the primary RO desalination system is connected with a primary water production recycling water tank, and the concentrated water end of the primary RO desalination system is connected with a secondary nanofiltration salt separation system.
Preferably, the secondary nanofiltration salt separation system is a nanofiltration membrane module, and the water production end of the secondary nanofiltration salt separation system is connected with the primary DTRO concentration system and the secondary DTRO concentration system.
Preferably, the first-stage DTRO concentration system is a disc tube type reverse osmosis membrane assembly, the water production end of the first-stage DTRO concentration system is connected with a first-stage water recycling water tank, and the concentrated water end of the first-stage DTRO concentration system is connected with a first-stage evaporative crystallization system.
Preferably, the second-stage RO desalination system is a low-pressure reverse osmosis membrane module, the water production end of the second-stage RO desalination system is connected with a second-stage produced water recycling water tank, and the concentrated water side of the second-stage RO desalination system is connected with a second-stage DTRO concentration system.
Preferably, the second-stage DTRO concentration system is a disc tube type reverse osmosis membrane assembly, the water production end of the second-stage DTRO concentration system is connected with a second-stage water production recycling water tank, and the concentrated water end of the second-stage DTRO concentration system is connected with a second-stage evaporation crystallization system.
The invention has the technical effects and advantages that the multi-stage salt purification treatment system for the wastewater in the chlor-alkali industry comprises the following steps:
1. the problems of incomplete salt separation of mixed salt generated in the wastewater process of the chlor-alkali industry, environmental pollution and the like are solved pertinently;
2. separating the wastewater into monovalent sodium chloride concentrated water and divalent sodium sulfate concentrated water by utilizing the selective permeability of a nanofiltration membrane to different ions, simultaneously designing multi-stage salt by a process, improving the purity of the salt, and finally crystallizing to obtain industrial-grade standard sodium chloride and sodium sulfate;
3. the system and the process have the characteristics of simple operation, stable operation, high salt separation efficiency, high salt purity, reduction of later evaporation amount and the like, and simultaneously, the energy consumption and the operation cost are greatly reduced.
Drawings
FIG. 1 is a schematic view of a processing system according to the present invention.
In the figure: 1. a regulating tank; 2. a softening reaction tank; 3. a middle water tank; 4. a media filter; 5. an ozone contact tank; 6. an anti-pollution pressure type ultrafiltration system; 7. a first-stage nanofiltration salt separation system; 8. a first-stage RO desalination system; 9. a secondary nanofiltration salt separation system; 10. a primary DTRO concentration system; 11. a first-order evaporative crystallization system; 12. a first-stage produced water recycling water tank; 13. a secondary RO desalination system; 14. a secondary DTRO concentration system; 15. a secondary evaporative crystallization system; 16. a secondary produced water recycling water tank; 17. a sludge concentration and filter pressing system; 18. sludge outward transport system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a multi-stage salt purification treatment system for wastewater in the chlor-alkali industry as shown in figure 1, which comprises a regulating tank 1, wherein:
chlor-alkali waste water passes through equalizing basin 1 and gets into the pretreatment unit, solid particle, suspended solid in the chlor-alkali waste water can be got rid of to the pretreatment unit and carry out COD to the chlor-alkali waste water and handle, pretreatment unit one side is connected with sludge concentration filter-pressing system 17, and sludge concentration filter-pressing system 17 is used for carrying out mud to waste water and breaks away from, sludge concentration filter-pressing system 17 passes through the pipeline and is connected with equalizing basin 1 for continue to handle in importing the supernatant into equalizing basin 1.
The pretreatment unit is connected with an anti-pollution pressure type ultrafiltration system 6, the anti-pollution pressure type ultrafiltration system 6 is connected with a primary nanofiltration salt separation system 7, and the primary nanofiltration salt separation system 7 can separate chlor-alkali wastewater into monovalent sodium chloride concentrated water and bivalent sodium sulfate concentrated water.
One-level is strained with receiving and is separated salt system 7 and one-level RO desalination system 8 and second grade RO desalination system 13 and be connected, and one-level RO desalination system 8 can improve the concentration of monovalent sodium chloride in the waste water, and second grade RO desalination system 13 can improve the concentration of bivalent sodium sulfate in the waste water.
The primary RO desalting system 8 is connected with the secondary nanofiltration salt separating system 9, the secondary nanofiltration salt separating system 9 can further separate the chlor-alkali wastewater into monovalent sodium chloride concentrated water and divalent sodium sulfate concentrated water, and the primary nanofiltration salt separating system 7 and the secondary nanofiltration salt separating system 9 are arranged, so that the salt separating purity can be effectively improved, and the recovery rate of sodium sulfate and sodium chloride is further improved.
The secondary nano-filtration salt separation system 9 is connected with a primary DTRO concentration system 10 and a secondary DTRO concentration system 14, the secondary RO desalination system 13 is connected with the secondary DTRO concentration system 14,
the primary DTRO concentration system 10 is connected with the primary evaporative crystallization system 11, the primary evaporative crystallization system 11 can perform evaporative crystallization treatment on high-salt wastewater conveyed by the primary DTRO concentration system 10 to finally obtain industrial sodium chloride, the secondary DTRO concentration system 14 is connected with the secondary evaporative crystallization system 15, and the secondary evaporative crystallization system 15 can perform evaporative crystallization treatment on the high-salt wastewater conveyed by the secondary DTRO concentration system 14 to finally obtain industrial sodium sulfate.
Specifically, the primary RO desalination system 8 and the primary DTRO concentration system 10 are connected to a primary produced water recycling water tank 12 for storing water.
The second-stage RO desalination system 13 and the second-stage DTRO concentration system 14 are connected with a second-stage produced water recycling water tank 16 and used for storing water.
Specifically, the pretreatment unit includes the softening reaction pond 2 of being connected with equalizing basin 1, just softening reaction pond 2 is connected with middle pond 3, middle pond 3 is connected with media filter 4, media filter 4 is connected with ozone contact tank 5, can remove COD through ozone oxidation to chlor-alkali waste water through ozone contact tank 5 and handle, is convenient for subsequent operation and processing, just ozone contact tank 5 is connected with antipollution pressure type ultrafiltration system 6 for carry out double-deck filtration to chlor-alkali waste water.
Softening reaction tank 2 one side is connected with sludge concentration filter-pressing system 17 through the pipeline for handle the waste water of the inside once more, just sludge concentration filter-pressing system 17 lower extreme passes through the pipeline to be connected with mud outward transport system 18, and mud outward transport system 18 can discharge the mud that sludge concentration filter-pressing system 17 produced.
Specifically, the anti-pollution pressure type ultrafiltration system 6 is a circulating ultrafiltration membrane and is used for treating liquid with high solid content and intercepting macromolecules, organic colloids, polysaccharides, microorganisms and the like in wastewater, and meanwhile, due to the large-flow turbulence and cross flow on the surface of the circulating ultrafiltration membrane, the pollution of pollutants on the surface of the membrane can be reduced.
Specifically, the first-stage nanofiltration salt separation system 7 is a roll-type nanofiltration membrane component, waste water is divided into monovalent sodium chloride concentrated water and divalent sodium sulfate concentrated water by utilizing the selective permeability of nanofiltration membranes to different ions, and the water production end of the first-stage nanofiltration salt separation system 7 is connected with a first-stage RO desalination system 8 and a second-stage RO desalination system 13 and is used for improving the concentrations of monovalent sodium chloride and divalent sodium sulfate in the waste water.
Specifically, the first-stage RO desalination system 8 is a low-pressure reverse osmosis membrane module and is used for improving the concentration of monovalent sodium chloride in wastewater, the water production end of the first-stage RO desalination system 8 is connected with a first-stage produced water recycling water tank 12 and is used for storing water, and the concentrated water end of the first-stage RO desalination system 8 is connected with a second-stage nanofiltration salt separation system 9.
Specifically, the secondary nanofiltration salt separation system 9 is a nanofiltration membrane component for further separating the wastewater into monovalent sodium chloride concentrated water and divalent sodium sulfate concentrated water, and a water production end of the secondary nanofiltration salt separation system 9 is connected with a primary DTRO concentration system 10 and a secondary DTRO concentration system 14.
Specifically, the primary DTRO concentration system 10 is a disc-tube reverse osmosis membrane module, and is used to effectively avoid membrane blockage and concentration polarization, and successfully prolong the service life of the membrane.
The water producing end of the primary DTRO concentration system 10 is connected with a primary water producing and recycling water tank 12 for storing water, and the concentrated water end of the primary DTRO concentration system 10 is connected with a primary evaporative crystallization system 11 for evaporative crystallization of high-salt wastewater to finally obtain industrial sodium chloride.
Specifically, the secondary RO desalination system 13 is a low-pressure reverse osmosis membrane module, and is used for increasing the concentration of divalent sodium sulfate in wastewater.
The water producing end of the secondary RO desalination system 13 is connected with a secondary produced water recycling water tank 16 for storing water, and the concentrated water side of the secondary RO desalination system 13 is connected with a secondary DTRO concentration system 14.
Specifically, concentrated system 14 of second grade DTRO is the dish tubular reverse osmosis membrane subassembly, can effectively avoid the membrane to block up and concentration polarization phenomenon, has successfully prolonged the life of diaphragm.
The water producing end of the second-stage DTRO concentration system 14 is connected with a second-stage produced water recycling water tank 16 and used for storing water, and the concentrated water end of the second-stage DTRO concentration system 14 is connected with a second-stage evaporative crystallization system 15 and used for evaporating and crystallizing high-salinity wastewater to finally obtain industrial-grade sodium sulfate.
The working principle is as follows: when the multi-stage salt purification treatment system for wastewater in the chlor-alkali industry is used for treating chlor-alkali wastewater, the chlor-alkali wastewater is regulated by the regulating tank 1 and then enters the softening reaction tank 2 to soften the chlor-alkali wastewater, the softening reaction tank 2 is connected with the intermediate water tank 3 through a pipeline and precipitates suspended matters in the softened chlor-alkali wastewater through the intermediate water tank 3, the intermediate water tank 3 is connected with the medium filter 4, the medium filter 4 is connected with the ozone contact tank 5, the ozone contact tank 5 can perform COD removal treatment on the chlor-alkali wastewater through ozone oxidation, the subsequent operation and treatment are facilitated, the side edge of the ozone contact tank 5 is connected with the sludge concentration and pressure filtration system 17 through a pipeline, the sludge concentration and pressure filtration system 17 performs sludge separation on the wastewater, the sludge concentration and pressure filtration system 17 is connected with the regulating tank 1 through a pipeline and is used for inputting supernatant into the regulating tank 1 to continue the treatment, and the bottom of the ozone contact tank 5 is connected with an anti-pollution pressure type ultrafiltration system 6 and is used for carrying out double-layer filtration on the chlor-alkali wastewater.
The pretreated chlor-alkali wastewater enters a primary nanofiltration salt separation system 7 and is divided into monovalent sodium chloride concentrated water and bivalent sodium sulfate concentrated water, the separated monovalent sodium chloride concentrated water enters a primary RO desalting system 8 to be subjected to monovalent sodium chloride concentration lifting, the separated bivalent sodium sulfate concentrated water enters a secondary RO desalting system 13 to be subjected to bivalent sodium sulfate concentration lifting, and the chlor-alkali wastewater lifted by the primary RO desalting system 8 enters a secondary nanofiltration salt separation system 9 to be connected and is further divided into monovalent sodium chloride concentrated water and bivalent sodium sulfate concentrated water.
And (3) allowing monovalent sodium chloride concentrated water further separated by the secondary nanofiltration salt separation system 9 to enter a primary evaporative crystallization system 11 through a primary DTRO concentration system 10 for evaporative crystallization treatment, and finally obtaining industrial-grade sodium sulfate.
The divalent sodium sulfate concentrated water lifted by the secondary RO desalting system 13 and the divalent sodium sulfate concentrated water further separated by the secondary nanofiltration salt separation system 9 enter a secondary evaporation crystallization system 15 through a secondary DTRO concentration system 14 for evaporation crystallization treatment, and finally industrial-grade sodium sulfate is obtained.
The one-level RO desalination system 8 and the one-level DTRO concentration system 10 are connected with the one-level produced water recycling water tank 12 for storing water, and the two-level RO desalination system 13 and the two-level DTRO concentration system 14 are connected with the two-level produced water recycling water tank 16 for storing water.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a many grades of salt purification processing system of chlor-alkali industry waste water, includes equalizing basin (1), its characterized in that:
the chlor-alkali wastewater enters a pretreatment unit through a regulating tank (1), and the pretreatment unit can remove solid particles and suspended matters in the chlor-alkali wastewater and carry out COD treatment on the chlor-alkali wastewater;
one side of the pretreatment unit is connected with a sludge concentration and pressure filtration system (17), and the sludge concentration and pressure filtration system (17) is connected with the regulating tank (1) through a pipeline;
the pretreatment unit is connected with an anti-pollution pressure type ultrafiltration system (6), the anti-pollution pressure type ultrafiltration system (6) is connected with a primary nanofiltration salt separation system (7), and the primary nanofiltration salt separation system (7) can separate chlor-alkali wastewater into monovalent sodium chloride concentrated water and bivalent sodium sulfate concentrated water;
the primary nanofiltration salt separation system (7) is connected with a primary RO desalination system (8) and a secondary RO desalination system (13);
the primary RO desalting system (8) is connected with the secondary nanofiltration salt separating system (9), and the secondary nanofiltration salt separating system (9) can further separate the chlor-alkali wastewater into monovalent sodium chloride concentrated water and divalent sodium sulfate concentrated water;
the secondary nano-filtration salt separation system (9) is connected with the primary DTRO concentration system (10) and the secondary DTRO concentration system (14), and the secondary RO desalination system (13) is connected with the secondary DTRO concentration system (14);
the primary DTRO concentration system (10) is connected with the primary evaporative crystallization system (11), and the secondary DTRO concentration system (14) is connected with the secondary evaporative crystallization system (15).
2. The multi-stage salt purification treatment system for wastewater of chlor-alkali industry as claimed in claim 1, wherein: the primary RO desalting system (8) and the primary DTRO concentrating system (10) are connected with a primary produced water recycling water tank (12);
and the secondary RO desalting system (13) and the secondary DTRO concentrating system (14) are connected with a secondary produced water recycling water tank (16).
3. The multi-stage salt purification treatment system for wastewater of chlor-alkali industry as claimed in claim 1, wherein: the pretreatment unit comprises a softening reaction tank (2) connected with a regulating tank (1), and the softening reaction tank (2) is connected with an intermediate water tank (3);
the middle water tank (3) is connected with a medium filter (4), the medium filter (4) is connected with an ozone contact tank (5), and the ozone contact tank (5) is connected with an anti-pollution pressure type ultrafiltration system (6);
softening reaction tank (2) one side and passing through the pipeline and be connected with sludge concentration filter-pressing system (17), just sludge concentration filter-pressing system (17) lower extreme is provided with mud outward transport system (18).
4. The multi-stage salt purification treatment system for wastewater of chlor-alkali industry as claimed in claim 1, wherein: the anti-pollution pressure type ultrafiltration system (6) is a circulating ultrafiltration membrane.
5. The multi-stage salt purification treatment system for wastewater of chlor-alkali industry as claimed in claim 1, wherein: the primary nanofiltration salt separation system (7) is a rolled nanofiltration membrane component, and the water production end of the primary nanofiltration salt separation system (7) is connected with a primary RO desalination system (8) and a secondary RO desalination system (13).
6. The multi-stage salt purification treatment system for wastewater of chlor-alkali industry as claimed in claim 1, wherein: the one-level RO desalination system (8) is a low-pressure reverse osmosis membrane module, the water production end of the one-level RO desalination system (8) is connected with a one-level water production and reuse water tank (12), and the concentrated water end of the one-level RO desalination system (8) is connected with a two-level nanofiltration salt separation system (9).
7. The multi-stage salt purification treatment system for wastewater of chlor-alkali industry as claimed in claim 1, wherein: the secondary nanofiltration salt separation system (9) is a nanofiltration membrane component, and the water production end of the secondary nanofiltration salt separation system (9) is connected with a primary DTRO concentration system (10) and a secondary DTRO concentration system (14).
8. The multi-stage salt purification treatment system for wastewater of chlor-alkali industry as claimed in claim 1, wherein: the primary DTRO concentration system (10) is a disc tube type reverse osmosis membrane component, the water production end of the primary DTRO concentration system (10) is connected with a primary water production and reuse water tank (12), and the concentrated water end of the primary DTRO concentration system (10) is connected with a primary evaporative crystallization system (11).
9. The multi-stage salt purification treatment system for wastewater of chlor-alkali industry as claimed in claim 1, wherein: the second-stage RO desalination system (13) is a low-pressure reverse osmosis membrane assembly, the water production end of the second-stage RO desalination system (13) is connected with a second-stage produced water recycling water tank (16), and the concentrated water side of the second-stage RO desalination system (13) is connected with a second-stage DTRO concentration system (14).
10. The multi-stage salt purification treatment system for wastewater of chlor-alkali industry as claimed in claim 1, wherein: the second-stage DTRO concentration system (14) is a disc tube type reverse osmosis membrane component, the water production end of the second-stage DTRO concentration system (14) is connected with a second-stage produced water recycling water tank (16), and the concentrated water end of the second-stage DTRO concentration system (14) is connected with a second-stage evaporation crystallization system (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110190311.9A CN112830618A (en) | 2021-02-18 | 2021-02-18 | Many grades of salt purification processing system of chlor-alkali trade waste water |
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| CN202110190311.9A CN112830618A (en) | 2021-02-18 | 2021-02-18 | Many grades of salt purification processing system of chlor-alkali trade waste water |
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| CN112830618A true CN112830618A (en) | 2021-05-25 |
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| CN202110190311.9A Pending CN112830618A (en) | 2021-02-18 | 2021-02-18 | Many grades of salt purification processing system of chlor-alkali trade waste water |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113582425A (en) * | 2021-08-23 | 2021-11-02 | 内蒙古晶泰环境科技有限责任公司 | Coking wastewater advanced treatment system and treatment method thereof |
| CN115321559A (en) * | 2022-08-26 | 2022-11-11 | 山东泉益环保科技有限公司 | Device and method for producing high-concentration sodium sulfate solution by adopting nanofiltration membrane concentration technology |
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2021
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113582425A (en) * | 2021-08-23 | 2021-11-02 | 内蒙古晶泰环境科技有限责任公司 | Coking wastewater advanced treatment system and treatment method thereof |
| CN115321559A (en) * | 2022-08-26 | 2022-11-11 | 山东泉益环保科技有限公司 | Device and method for producing high-concentration sodium sulfate solution by adopting nanofiltration membrane concentration technology |
| CN115321559B (en) * | 2022-08-26 | 2024-04-05 | 山东泉益环保科技有限公司 | Device and method for producing high-concentration sodium sulfate solution by nanofiltration membrane concentration technology |
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