CN112794509A - Method for separating salt from sodium chloride and sodium sulfate in high-salinity wastewater based on membrane method treatment - Google Patents
Method for separating salt from sodium chloride and sodium sulfate in high-salinity wastewater based on membrane method treatment Download PDFInfo
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- 239000012528 membrane Substances 0.000 title claims abstract description 71
- 239000002351 wastewater Substances 0.000 title claims abstract description 63
- 150000003839 salts Chemical class 0.000 title claims abstract description 53
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000011780 sodium chloride Substances 0.000 title claims abstract description 22
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 title claims abstract description 19
- 229910052938 sodium sulfate Inorganic materials 0.000 title claims abstract description 19
- 235000011152 sodium sulphate Nutrition 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 101
- 238000001728 nano-filtration Methods 0.000 claims abstract description 64
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 32
- 238000000926 separation method Methods 0.000 claims abstract description 14
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 14
- 238000000746 purification Methods 0.000 claims abstract description 12
- 239000008213 purified water Substances 0.000 claims abstract description 12
- 238000010992 reflux Methods 0.000 claims abstract description 8
- 239000002245 particle Substances 0.000 claims abstract description 7
- 239000003814 drug Substances 0.000 claims description 26
- 238000005192 partition Methods 0.000 claims description 18
- 239000012466 permeate Substances 0.000 claims description 17
- 239000012141 concentrate Substances 0.000 claims description 10
- 159000000000 sodium salts Chemical class 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 239000002455 scale inhibitor Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims 3
- 238000011084 recovery Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 8
- 239000013078 crystal Substances 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 239000010842 industrial wastewater Substances 0.000 description 3
- 229940079593 drug Drugs 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012377 drug delivery Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- -1 salt sodium chloride Chemical class 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- 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
- C01D3/04—Chlorides
- C01D3/08—Preparation by working up natural or industrial salt mixtures or siliceous minerals
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/32—Hydrocarbons, e.g. oil
-
- 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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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a salt separation method of sodium chloride and sodium sulfate in high-salinity wastewater based on membrane treatment, which comprises the steps of firstly enabling the wastewater to enter an ultrafiltration device, effectively removing particles and oil in the water by ultrafiltration, then introducing the wastewater after ultrafiltration into a nanofiltration system, separating divalent salt and part of organic matters from monovalent salt by utilizing the characteristics of a nanofiltration membrane, intercepting and refluxing the divalent salt and the organic matters to a divalent salt water storage tank, carrying out nanofiltration water purification, then enabling the nanofiltration water to pass through a reverse osmosis system, effectively removing monovalent salt, and refluxing the purified water to the divalent salt water storage tank; the method has the characteristics of reasonable flow, resource recovery, economy, high efficiency and stable operation, can well make up the defects in the existing high-salinity wastewater salinity separating technology, enables the high-salinity concentrated solution treatment to achieve the aim of zero discharge, and realizes the maximum resource utilization of the high-salinity wastewater.
Description
Technical Field
The invention relates to the technical field of industrial wastewater, in particular to a salt separation method of sodium chloride and sodium sulfate in high-salinity wastewater based on membrane treatment.
Background
Nowadays, water environment problems become the focus of global attention, and effective treatment and utilization of industrial wastewater are also attracting attention. Actively promoting industrial water conservation and improving the water use efficiency of industrial wastewater are effective ways for relieving water resource shortage, and simultaneously can reduce the discharge amount of waste water and waste salt, thereby achieving the purposes of protecting water environment and promoting the sustainable development of social economy.
In the traditional method for separating salt, the most common method is to directly carry out evaporative crystallization and freezing crystallization treatment on unseparated miscellaneous salt or purify the low-purity crystal salt again by a recrystallization method, and the method has the defects of large investment, high operation cost, low recovery rate, low purity of the crystal salt and the like and is limited in wide application. With the innovation and progress of the membrane method treatment technology, the salt separation process of sodium chloride and sodium sulfate in the high-salinity wastewater treated based on the membrane method has a plurality of advantages, sodium sulfate and sodium chloride crystal salt with higher purity can be obtained, and the investment and operation cost is lower.
Disclosure of Invention
The invention aims to provide an economical, stable, efficient and energy-saving method for separating sodium chloride and sodium sulfate in high-salinity wastewater based on membrane treatment, so that the maximum resource utilization of the high-salinity wastewater is realized, and the problem of resource waste is solved.
In order to achieve the purpose, the invention provides the following technical scheme:
a salt separation method for sodium chloride and sodium sulfate in high-salinity wastewater based on membrane method treatment comprises the following steps:
s1: placing a high-salinity water storage tank in a high-salinity wastewater discharge area, directly connecting the high-salinity water storage tank with a high-salinity wastewater discharge port through a high-salinity wastewater discharge pipeline, pumping the high-salinity wastewater into an ultrafiltration device by using a raw water pump, removing particles and oil, and then feeding the high-salinity wastewater into a buffer water tank;
s2: the waste water outlet end of the cache water tank enters a nanofiltration membrane component through a primary high-pressure pump, and nanofiltration membrane permeate and nanofiltration membrane concentrate are obtained through separation by a nanofiltration system in the nanofiltration membrane component;
s3: the permeate of the nanofiltration membrane enters a nanofiltration water purification water storage tank, and the concentrate of the nanofiltration membrane enters a cache water tank through a stop return pipe;
s4: the nanofiltration membrane permeate obtained from the nanofiltration water purification storage tank in the S3 enters a reverse osmosis membrane assembly through a secondary high-pressure pump to form a set of reverse osmosis treatment system, and the reverse osmosis membrane permeate and a reverse osmosis membrane concentrate are obtained through treatment of the reverse osmosis membrane assembly;
s5: and (4) introducing the reverse osmosis concentrated solution in the S4 into a sodium salt water storage tank, and refluxing the reverse osmosis membrane permeate as purified water to a cache water tank through a purified water recycling pipe so as to dilute the nanofiltration membrane concentrated solution.
Furthermore, the high-salt water storage tank, the cache water tank, the nanofiltration water purification water storage tank and the sodium salt water storage tank are all the same tank body component, and the tank body component is provided with a feeding device for adding medicines and scale inhibitors.
Furthermore, put in the device and constitute by bottleneck and apron, the apron lid closes on the bottleneck, and the medial surface of apron is equipped with the medicament hold up tank, is equipped with the baffle that is used for controlling the medicament whereabouts in the bottleneck, and the baffle is transversely pegged graft in the bottleneck, and the up end of baffle and the lower port parallel and level butt joint of medicament hold up tank have seted up the through-hole at the one end that the side was inserted to the baffle, and the up end of baffle is equipped with the contact bump in through-hole one side, still is equipped with the pull ring in the outside of baffle.
Furthermore, the medicament storage tank of terminal surface is equipped with a plurality ofly from turning to the right in proper order increase interval from a left side, and the size of the through-hole of seting up on the baffle is with leftmost medicament storage tank size looks adaptation, and when the baffle inserted the bottleneck completely, its through-hole of inserting the side is the dislocation set with leftmost medicament storage tank.
Further, the salt concentration of the high-salt wastewater discharged through the high-salt wastewater discharge pipeline is 100-200 g/L.
Furthermore, the inlet end of the nanofiltration membrane component in the S2 is connected with a high-pressure pump through a pipeline, a pressure gauge is arranged on the pipeline, the outlet end of the nanofiltration membrane component is respectively connected with the buffer water tank and the nanofiltration purified water storage tank, and a corresponding flowmeter and a corresponding sampling valve are arranged on the pipeline.
Further, the reverse osmosis treatment system in S4 includes a water sample sampling unit, a water sample treatment unit, an analysis unit, and a control unit.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a salt separation method of sodium chloride and sodium sulfate in high-salinity wastewater based on membrane treatment, which comprises the steps of firstly enabling the wastewater to enter an ultrafiltration device, effectively removing particles and oil in the water by ultrafiltration, then introducing the wastewater after ultrafiltration into a nanofiltration system, separating divalent salt and part of organic matters from monovalent salt by utilizing the characteristics of a nanofiltration membrane, intercepting and refluxing the divalent salt and the organic matters to a divalent salt water storage tank, carrying out nanofiltration water purification, then enabling the nanofiltration water to pass through a reverse osmosis system, effectively removing monovalent salt, and circulating the purified water to the divalent salt water storage tank in a reflux manner, wherein nanofiltration is used for reverse osmosis pretreatment in the reverse osmosis process, so that the salinity of the wastewater entering a reverse osmosis membrane module can be; the method has the characteristics of reasonable flow, resource recovery, economy, high efficiency and stable operation, can well make up the defects in the existing high-salinity wastewater salinity separating technology, and enables the high-salinity concentrated solution to achieve the aim of zero emission.
Drawings
FIG. 1 is a structural framework diagram of the method of the present invention;
fig. 2 is a structural view of a drug delivery device of the present invention;
fig. 3 is an exploded view of the medicament delivery device of the present invention.
In the figure: 1. a high salt water storage tank; 2. an ultrafiltration device; 3. a buffer water tank; 4. stopping the return pipe; 5. a nanofiltration membrane module; 6. a nanofiltration purified water storage tank; 7. a reverse osmosis membrane module; 8. a sodium salt water storage tank; 9. a purified water recycling pipe; 10. a high-salinity wastewater discharge pipeline; 11. a delivery device; 101. a bottle mouth; 102. a cover plate; 103. a medicament storage tank; 104. a partition plate; 105. a through hole; 106. contacting the bumps; 107. and (4) a pull ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings 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 of the 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.
Referring to fig. 1, in the embodiment of the present invention: the salt separation method for sodium chloride and sodium sulfate in high-salinity wastewater based on membrane method treatment comprises the following steps:
the first step is as follows: a high-salinity water storage tank 1 is arranged in a high-salinity wastewater discharge area, the high-salinity water storage tank 1 is directly connected with a high-salinity wastewater discharge port through a high-salinity wastewater discharge pipeline 10, and the high-salinity wastewater is pumped into an ultrafiltration device 2 by a raw water pump to remove particles and oil and then enters a buffer water tank 3;
the second step is that: the waste water outlet end of the cache water tank 3 enters the nanofiltration membrane component 5 through a first-stage high-pressure pump, and nanofiltration permeate and nanofiltration concentrate are obtained through separation by a nanofiltration system in the nanofiltration membrane component 5;
the third step: the permeate of the nanofiltration membrane enters a nanofiltration water purification water storage tank 6, and the concentrate of the nanofiltration membrane enters a cache water tank 3 through a stop return pipe 4, so that the divalent salt removal rate can reach more than 98 percent and partial organic matter removal effect is facilitated;
the fourth step: the nanofiltration membrane permeate obtained from the nanofiltration water purification water storage tank 6 in the third step enters a reverse osmosis membrane component 7 through a secondary high-pressure pump to form a set of reverse osmosis treatment system, the removal rate of monovalent salt reaches 70-90%, and the monovalent salt is treated by the reverse osmosis membrane component 7 to obtain reverse osmosis membrane permeate and reverse osmosis membrane concentrate;
the fifth step: the reverse osmosis concentrated solution in the fourth step is introduced into the sodium salt water storage tank 8, the reverse osmosis membrane permeate liquid as purified water flows back to the cache water tank 3 through the water purification recycling pipe 9 to dilute the concentration of the divalent salt solution in the nanofiltration membrane concentrated solution, so that the cost of the buffer water tank is reduced by circulation, the divalent salt concentration of the cache water tank 3 is moderate, long-time circulation operation is achieved, and meanwhile, the salt separation post-treatment is more convenient, so that the salt separation achieves high recovery rate and high purity.
Referring to fig. 2-3, in the present embodiment, the high-salt water storage tank 1, the buffer water tank 3, the nanofiltration water purification water storage tank 6 and the sodium salt water storage tank 8 are all the same tank body member, and the tank body member is equipped with a feeding device 11 for adding drugs and scale inhibitors; the feeding device 11 is composed of a bottle opening 101 and a cover plate 102, the cover plate 102 covers the bottle opening 101, a medicament storage groove 103 is arranged on the inner side surface of the cover plate 102, a partition plate 104 used for controlling medicament falling is arranged in the bottle opening 101, the partition plate 104 is transversely inserted into the bottle opening 101, the upper end surface of the partition plate 104 is flush and butted with the lower end opening of the medicament storage groove 103, a through hole 105 is formed in one end of the inserting side of the partition plate 104, a contact salient point 106 is arranged on one side of the through hole 105 on the upper end surface of the partition plate 104, and a pull ring 107 is further arranged outside the.
In the above embodiment, the medicament storage grooves 103 on the lower end surface of the cover plate 102 are arranged in a plurality of sizes from left to right at increasing intervals, the size of the through hole 105 formed in the partition plate 104 is matched with the size of the medicament storage groove 103 on the leftmost side, and when the partition plate 104 is completely inserted into the bottle mouth 101, the through hole 105 on the insertion side and the medicament storage groove 103 on the leftmost side are arranged in a staggered manner.
The working principle of the throwing device 11 is as follows: medicine and antisludging agent are put into the medicine storage tank 103 below the cover plate 102 in advance, the partition plate 104 is pulled through the external pull ring 107, whether the through hole 105 reaches the lower part of the corresponding medicine storage tank 103 or not is judged through resistance generated by the contact convex point 106 arranged at the upper end of the partition plate 104 across the lower port of the medicine storage tank 103, so that medicine stored in the medicine storage tank 103 in advance can be put into the box body, dirt inside the box body can be cleaned after regular operation, the service life of the box body is prolonged, and the cost is reduced.
In this embodiment, the inlet end of the nanofiltration membrane component 5 in the second step is connected to the high-pressure pump through a pipeline, a pressure gauge is installed on the pipeline, the outlet end of the nanofiltration membrane component 5 is connected to the buffer water tank 3 and the nanofiltration water purification water storage tank 6, respectively, and a corresponding flow meter and a sampling valve are arranged on the pipeline.
In this embodiment, step four still includes waste water on-line monitoring and automated control subassembly, specifically comprises water sampling unit, water sample processing unit, analysis unit and the control unit.
To further better explain the high efficiency effect of the above method in practical use, the following specific examples are provided:
the first embodiment is as follows:
taking the salt concentration of the coastal industrial high-salinity wastewater in Tianjin city of about 60g/L as an example:
the first step is as follows: a high-salinity water storage tank 1 is arranged in a high-salinity wastewater discharge area, the high-salinity water storage tank 1 is directly connected with a high-salinity wastewater discharge port through a high-salinity wastewater discharge pipeline 10, high-salinity wastewater is pumped into an ultrafiltration device 2 by a raw water pump to remove particles and oil, and then the high-salinity wastewater enters a buffer water tank 3; the waste water outlet end of the buffer water tank 3 enters the nanofiltration membrane component 5 through a first-stage high-pressure pump, nanofiltration membrane permeate and nanofiltration membrane concentrate are obtained through a nanofiltration system, the TOC removal rate can reach 85.5%, the total oil removal rate can reach 95%, the chroma is reduced from 80 to 2, and divalent ions can be effectively intercepted to achieve the purpose of salt separation;
the second step is that: the wastewater after nanofiltration treatment enters a reverse osmosis system, the trapped fluid contains inorganic salt mainly comprising sodium chloride, monovalent salt sodium chloride is obtained by an evaporative crystallization system in the later stage, sodium chloride crystal salt is obtained after crystallization and drying, reverse osmosis membrane permeate is used as reuse water to dilute the concentration of the wastewater concentrated by a divalent salt water tank, finally the obtained sodium sulfate solid and sodium chloride solid have less impurities, the purity reaches the standard of industrial dry salt second-level (II-type), and resource recovery can be realized.
In summary, the following steps: the invention provides a salt separation method of sodium chloride and sodium sulfate in high-salinity wastewater based on membrane treatment, which comprises the steps of firstly enabling the wastewater to enter an ultrafiltration device 2, effectively removing particles and oil in the wastewater by ultrafiltration, then introducing the wastewater after ultrafiltration into a nanofiltration system, separating divalent salt and part of organic matters from monovalent salt by utilizing the characteristics of a nanofiltration membrane, intercepting and refluxing the divalent salt and the organic matters to a divalent salt water storage tank, carrying out nanofiltration and purifying the water, then effectively removing monovalent salt by a reverse osmosis system, and refluxing the purified water to the divalent salt water storage tank; the method has the characteristics of reasonable flow, resource recovery, economy, high efficiency and stable operation, can well make up the defects in the existing high-salinity wastewater salinity separating technology, and enables the high-salinity concentrated solution to achieve the aim of zero emission.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (7)
1. A salt separation method for sodium chloride and sodium sulfate in high-salinity wastewater based on membrane treatment is characterized by comprising the following steps:
s1: placing a high-salinity water storage tank (1) in a high-salinity wastewater discharge area, directly connecting the high-salinity water storage tank (1) with a high-salinity wastewater discharge port through a high-salinity wastewater discharge pipeline (10), extracting high-salinity wastewater from an ultrafiltration device (2) by using a raw water pump, removing particles and oil, and then feeding the high-salinity wastewater into a buffer water tank (3);
s2: a wastewater outlet end of the cache water tank (3) enters the nanofiltration membrane component (5) through a primary high-pressure pump, and is separated by a nanofiltration system in the nanofiltration membrane component (5) to obtain nanofiltration membrane permeate and nanofiltration membrane concentrate;
s3: the nanofiltration membrane permeate enters a nanofiltration water purification water storage tank (6), and the nanofiltration membrane concentrate enters a cache water tank (3) through a stop return pipe (4);
s4: the nanofiltration membrane permeate obtained from the nanofiltration water purification storage tank (6) in the S3 enters a reverse osmosis membrane module (7) through a secondary high-pressure pump to form a set of reverse osmosis treatment system, and is treated by the reverse osmosis membrane module (7) to obtain reverse osmosis membrane permeate and reverse osmosis membrane concentrate;
s5: and (3) introducing the reverse osmosis concentrated solution in the S4 into a sodium salt water storage tank (8), and refluxing the reverse osmosis membrane permeate as purified water to a cache water tank (3) through a purified water recycling pipe (9) so as to dilute the nanofiltration membrane concentrated solution.
2. The method for separating the salt of the sodium chloride and the sodium sulfate in the high-salinity wastewater based on the membrane method treatment as claimed in claim 1, wherein the high-salinity water storage tank (1), the buffer water tank (3), the nanofiltration pure water storage tank (6) and the sodium salt water storage tank (8) are all the same box member, and the box member is provided with a feeding device (11) for adding the medicine and the scale inhibitor.
3. The salt separation method of sodium chloride and sodium sulfate in high-salinity wastewater based on membrane process treatment according to claim 2, characterized in that the feeding device (11) is composed of a bottle mouth (101) and a cover plate (102), the cover plate (102) covers the bottle mouth (101), the inner side surface of the cover plate (102) is provided with a medicament storage tank (103), the bottle mouth (101) is provided with a partition plate (104) for controlling medicament falling, the partition plate (104) is transversely inserted into the bottle mouth (101), the upper end surface of the partition plate (104) is flush and butt-jointed with the lower port of the medicament storage tank (103), one end of the insertion side of the partition plate (104) is provided with a through hole (105), the upper end surface of the partition plate (104) is provided with a contact convex point (106) on one side of the through hole (105), and the outside of the partition plate (104) is further provided with a pull ring.
4. The method for separating the salt from the sodium chloride and the sodium sulfate in the high-salinity wastewater treated by the membrane method according to claim 3, wherein a plurality of the chemical storage tanks (103) on the lower end surface of the cover plate (102) are arranged at intervals which are sequentially increased from left to right, the size of the through hole (105) formed in the partition plate (104) is matched with that of the chemical storage tank (103) on the leftmost side, and when the partition plate (104) is completely inserted into the bottle mouth (101), the through hole (105) on the insertion side and the chemical storage tank (103) on the leftmost side are arranged in a staggered manner.
5. The method for separating sodium chloride and sodium sulfate from high-salinity wastewater based on membrane process treatment as defined in claim 1, wherein the salt concentration of the high-salinity wastewater discharged through the high-salinity wastewater discharge pipe (10) is 100-200 g/L.
6. The salt separating method for sodium chloride and sodium sulfate in high-salinity wastewater based on membrane process treatment according to claim 1, characterized in that an inlet end of the nanofiltration membrane module (5) in S2 is connected with a high-pressure pump through a pipeline, a pressure gauge is installed on the pipeline, an outlet end of the nanofiltration membrane module (5) is respectively connected with the buffer water tank (3) and the nanofiltration purified water storage tank (6), and a corresponding flow meter and a corresponding sampling valve are arranged on the pipeline.
7. The method for separating salts of sodium chloride and sodium sulfate in high-salinity wastewater based on membrane process treatment according to claim 1, wherein the reverse osmosis treatment system in S4 comprises a water sample sampling unit, a water sample treatment unit, an analysis unit and a control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110034956.3A CN112794509A (en) | 2021-01-12 | 2021-01-12 | Method for separating salt from sodium chloride and sodium sulfate in high-salinity wastewater based on membrane method treatment |
Applications Claiming Priority (1)
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