CN114524559A - Treatment system and treatment method for resource utilization of salt separation evaporation crystallization mother liquor - Google Patents
Treatment system and treatment method for resource utilization of salt separation evaporation crystallization mother liquor Download PDFInfo
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- CN114524559A CN114524559A CN202210072787.7A CN202210072787A CN114524559A CN 114524559 A CN114524559 A CN 114524559A CN 202210072787 A CN202210072787 A CN 202210072787A CN 114524559 A CN114524559 A CN 114524559A
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- 239000012452 mother liquor Substances 0.000 title claims abstract description 229
- 238000002425 crystallisation Methods 0.000 title claims abstract description 84
- 230000008025 crystallization Effects 0.000 title claims abstract description 83
- 150000003839 salts Chemical class 0.000 title claims abstract description 52
- 238000001704 evaporation Methods 0.000 title claims abstract description 51
- 230000008020 evaporation Effects 0.000 title claims abstract description 50
- 238000000926 separation method Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 42
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 104
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 60
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 58
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims abstract description 54
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims abstract description 54
- 235000011130 ammonium sulphate Nutrition 0.000 claims abstract description 54
- 239000012528 membrane Substances 0.000 claims abstract description 53
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 52
- 239000002351 wastewater Substances 0.000 claims abstract description 51
- 238000000909 electrodialysis Methods 0.000 claims abstract description 36
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000011780 sodium chloride Substances 0.000 claims abstract description 29
- 238000002360 preparation method Methods 0.000 claims abstract description 28
- 238000004064 recycling Methods 0.000 claims abstract description 18
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 17
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 17
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 17
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims abstract description 11
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 74
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 37
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 37
- 238000001914 filtration Methods 0.000 claims description 30
- 239000012535 impurity Substances 0.000 claims description 24
- 238000009388 chemical precipitation Methods 0.000 claims description 23
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 22
- 239000003814 drug Substances 0.000 claims description 22
- 239000003513 alkali Substances 0.000 claims description 17
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 14
- 238000005189 flocculation Methods 0.000 claims description 12
- 230000016615 flocculation Effects 0.000 claims description 12
- 239000002585 base Substances 0.000 claims description 11
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 239000001569 carbon dioxide Substances 0.000 claims description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 9
- 238000007710 freezing Methods 0.000 claims description 9
- 230000008014 freezing Effects 0.000 claims description 9
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 8
- 239000011734 sodium Substances 0.000 claims description 8
- 229910052708 sodium Inorganic materials 0.000 claims description 8
- 238000005345 coagulation Methods 0.000 claims description 7
- 230000015271 coagulation Effects 0.000 claims description 7
- 239000002244 precipitate Substances 0.000 claims description 7
- 238000006386 neutralization reaction Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000001179 sorption measurement Methods 0.000 claims description 6
- 238000000108 ultra-filtration Methods 0.000 claims description 6
- 230000003472 neutralizing effect Effects 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 239000000701 coagulant Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 239000000126 substance Substances 0.000 abstract description 7
- 239000010842 industrial wastewater Substances 0.000 abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 11
- 238000004062 sedimentation Methods 0.000 description 11
- 239000000243 solution Substances 0.000 description 10
- 239000002253 acid Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000010413 mother solution Substances 0.000 description 9
- 238000003860 storage Methods 0.000 description 9
- 239000003245 coal Substances 0.000 description 7
- 230000007613 environmental effect Effects 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229920001429 chelating resin Polymers 0.000 description 3
- 238000003889 chemical engineering Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000002920 hazardous waste Substances 0.000 description 3
- 238000001728 nano-filtration Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000008235 industrial water Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/16—Halides of ammonium
- C01C1/164—Ammonium chloride
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/24—Sulfates of ammonium
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/16—Preparation from compounds of sodium or potassium with amines and carbon dioxide
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C3/00—Fertilisers containing other salts of ammonia or ammonia itself, e.g. gas liquor
-
- 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
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
-
- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F2101/30—Organic compounds
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- 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
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The embodiment of the application discloses a treatment system and a treatment method for recycling a salt separation evaporation crystallization mother liquor, which relate to the technical field of water treatment, and the technical scheme comprises a wastewater pretreatment subsystem for removing hardness, suspended matters and COD (chemical oxygen demand) in a sodium chloride mother liquor; the electrodialysis bipolar membrane subsystem is communicated with the wastewater pretreatment subsystem and is used for receiving mother liquor discharged by the wastewater pretreatment subsystem and treating the mother liquor discharged by the wastewater pretreatment subsystem to prepare hydrochloric acid and sodium hydroxide; and the ammonia-soda preparation subsystem is connected with the electrodialysis bipolar membrane subsystem and is used for receiving the sodium sulfate mother liquor and the mother liquor treated by the electrodialysis bipolar membrane subsystem, and homogenizing the two mother liquors to prepare sodium bicarbonate, ammonium sulfate and ammonium chloride. The embodiment of the application is suitable for treating the evaporation crystallization mother liquor, and recycling the mother liquor, thereby realizing the aim of zero emission of industrial wastewater.
Description
Technical Field
The application relates to the technical field of water treatment. In particular to a treatment system and a treatment method for resource utilization of a salt separation evaporation crystallization mother liquor.
Background
In the field of water treatment technology, zero discharge of industrial waste water is required, which requires that the concentrated waste water cannot be discharged from the system, but rather that the high salinity waste water is converted into product salt. The main current processes of zero discharge of waste water at present comprise a nanofiltration salt separation and multiple-effect evaporation process, a nanofiltration salt separation and MVR + crystallizer, and a nanofiltration salt separation and MVR/multiple-effect evaporation. The mother liquor mixed liquor in the evaporation, crystallization and concentration process enriches most of impurities in the system, and the enrichment of the impurities directly affects the boiling point rising parameter of the solution evaporation and the quality of the salt content of the product, so that the mother liquor needs to be discharged from the system, but the mother liquor needs to be evaporated into solid miscellaneous salt in order to meet the requirement of zero discharge of wastewater.
With the stricter environmental protection requirements of China, according to the method that salt mud which is generated by waste water treatment and cannot be recycled in the coal chemical industry in the modern coal chemical engineering construction project environment admission conditions is managed temporarily according to hazardous wastes, the hazardous wastes are required to be subjected to rigid landfill according to the regulation of hazardous waste landfill pollution control standards, the treatment cost is about 4000 yuan/ton and 5000 yuan/ton, and huge economic pressure is brought to enterprises, so that the method converts miscellaneous salt into a product meeting the standards, reduces the production pressure of the enterprises, and is an effective way for solving the miscellaneous salt in the coal chemical industry.
Disclosure of Invention
In view of this, the embodiment of the present application provides a treatment system and a treatment method for recycling mother liquor of salt separation evaporation crystallization, so as to recycle the mother liquor, thereby achieving the purpose of "zero emission" of industrial wastewater.
In a first aspect, an embodiment of the application provides a treatment system for resource utilization of a salt separation evaporation crystallization mother liquor, which comprises a wastewater pretreatment subsystem, a salt separation evaporation crystallization mother liquor recovery subsystem and a salt separation evaporation crystallization mother liquor recovery subsystem, wherein the wastewater pretreatment subsystem is used for removing hardness, suspended matters and COD in a sodium chloride mother liquor;
the electrodialysis bipolar membrane subsystem is communicated with the wastewater pretreatment subsystem and is used for receiving mother liquor discharged by the wastewater pretreatment subsystem and treating the mother liquor discharged by the wastewater pretreatment subsystem to prepare hydrochloric acid and sodium hydroxide;
and the ammonia-soda preparation subsystem is connected with the electrodialysis bipolar membrane subsystem and is used for receiving the sodium sulfate mother liquor and the mother liquor treated by the electrodialysis bipolar membrane subsystem, and homogenizing the two mother liquors to prepare sodium bicarbonate, ammonium sulfate and ammonium chloride.
According to a specific implementation manner of the embodiment of the application, the wastewater pretreatment subsystem comprises a chemical precipitation hardness removal device, a filtration impurity removal device and a COD removal device which are communicated in sequence;
the chemical precipitation hardening removal device adopts a hardening removal medicament, a flocculation coagulation aid medicament and an acid-base neutralization medicament to treat the sodium chloride mother liquor so as to remove hardness in the mother liquor;
the filtration and impurity removal device filters the mother liquor treated by the chemical precipitation and hardness removal device to remove turbidity and suspended matters in the mother liquor and reduce the SDI value of the mother liquor;
the COD removing device is used for carrying out adsorption exchange on the mother liquor treated by the filtering and impurity removing device so as to remove COD and residual hardness in the mother liquor.
According to a specific implementation manner of the embodiment of the application, the hardness removing agent comprises sodium hydroxide, sodium bicarbonate and sodium metaaluminate; the flocculation coagulant aid is PAM and PFS; the acid-base neutralizing agent is hydrochloric acid or sulfuric acid.
According to a specific implementation manner of the embodiment of the application, the filtration and impurity removal device comprises a multi-media filter and an ultrafiltration membrane.
According to a specific implementation manner of the embodiment of the application, the COD removing device is a resin tower.
According to a specific implementation manner of the embodiment of the application, the electrodialysis bipolar membrane subsystem comprises a bipolar membrane device, and the bipolar membrane device is used for receiving the mother liquor discharged by the wastewater pretreatment subsystem and treating the mother liquor discharged by the wastewater pretreatment subsystem to prepare hydrochloric acid and sodium hydroxide.
According to a specific implementation manner of the embodiment of the application, the ammonia-soda preparation subsystem comprises a regulating homogenizing device, a sodium bicarbonate preparation device, an ammonium sulfate evaporation crystallization device and an ammonium chloride cold separation crystallization device which are sequentially communicated;
the adjusting and homogenizing device is used for receiving a sodium sulfate mother solution and a mother solution treated by the electrodialysis bipolar membrane subsystem, and adjusting and homogenizing the two mother solutions to form a homogenized mother solution;
the sodium bicarbonate preparation device is used for receiving the homogenized mother liquor of the adjusting homogenizing device, and simultaneously introducing ammonia gas and carbon dioxide into the sodium bicarbonate preparation device to generate sodium bicarbonate precipitate so as to obtain sodium bicarbonate and heavy alkali mother liquor;
the ammonium sulfate evaporation crystallization device is used for carrying out evaporation crystallization on the heavy alkali mother liquor so as to obtain ammonium sulfate and ammonium sulfate mother liquor;
the ammonium chloride cold-separation crystallization device is used for cooling the ammonium sulfate mother liquor to obtain ammonium chloride and ammonium chloride mother liquor, and the ammonium chloride mother liquor returns to the chemical precipitation hardness removal device.
According to a specific implementation manner of the embodiment of the application, the ammonium sulfate evaporative crystallization device is an MVR evaporator; the ammonium chloride cold separation crystallization device comprises a freezing heat exchanger and a crystallizer.
In a second aspect, the embodiment of the application provides a treatment method for resource utilization of a mother liquor of salt separation evaporative crystallization, which comprises the steps of introducing one of mother liquors of sodium chloride mother liquor into a wastewater pretreatment subsystem, and removing hardness, suspended matters and COD in the mother liquor;
introducing the mother liquor with hardness, suspended matters and COD removed into an electrodialysis bipolar membrane subsystem for electrodialysis treatment to prepare hydrochloric acid and sodium hydroxide and obtain new mother liquor;
and introducing the new mother liquor and the sodium sulfate mother liquor into an ammonia-soda preparation subsystem to homogenize the two mother liquors to form a homogeneous mother liquor, introducing ammonia gas and carbon dioxide into the homogeneous mother liquor to obtain sodium bicarbonate, performing evaporative crystallization to obtain ammonium sulfate, and performing cold crystallization to obtain ammonium chloride.
According to the embodiment of the application, the treatment system and the treatment method for resource utilization of the mother liquor of salt separation evaporation crystallization are implemented in a concrete way, wherein one mother liquor of the mother liquor of sodium chloride is introduced into a wastewater pretreatment subsystem, and hardness, suspended matters and COD in the mother liquor are removed, and the treatment system comprises:
introducing one strand of mother liquor of the sodium chloride mother liquor into a chemical precipitation and hardness removal device, and adding a hardness removal medicament, a flocculation coagulation aid medicament and an acid-base neutralization medicament into the sodium chloride mother liquor to treat the sodium chloride mother liquor so as to remove the hardness in the mother liquor;
introducing the mother liquor treated by the chemical precipitation hardness removal device into a filtering and impurity removal device for filtering so as to remove turbidity and suspended matters in the mother liquor and reduce the SDI value of the mother liquor;
and introducing the mother liquor treated by the filtering and impurity removing device into a COD (chemical oxygen demand) removing device for adsorption exchange so as to remove COD and residual hardness in the mother liquor.
Compared with the prior art, the method has the following characteristics and beneficial effects:
1. according to the treatment system and the treatment method for recycling the mother liquor generated by salt separation evaporation crystallization, the mother liquor generated by salt separation evaporation crystallization can be recycled, the generation of miscellaneous salts is reduced to the maximum extent, and the disposal cost of miscellaneous salts per ton is about 5000-7000 yuan according to the method that salt mud which is generated by coal chemical industry and cannot be recycled is managed according to dangerous waste temporarily in the environmental access condition of modern coal chemical engineering construction project. The invention can greatly reduce the production cost of enterprises and reduce the pressure of the enterprises.
2. According to the treatment system and the treatment method for recycling the salt separation evaporative crystallization mother liquor, the electrodialysis bipolar membrane technology and the evaporative crystallization technology are combined, the concentration of ions in the mother liquor is adjusted by the electrodialysis bipolar membrane device, and the whole process circulation and stable operation are ensured.
3. According to the treatment system and the treatment method for recycling the salt separation evaporative crystallization mother liquor, the ammonium bicarbonate serving as the raw material is recovered from the acid gas treatment processes of CO2 and NH3, the pollution and carbon reduction synergistic effect is realized in the whole process, the national carbon emission reduction policy is actively responded, and the industrial upgrading and green production of related industries can be greatly promoted.
4. According to the treatment system and the treatment method for recycling the salt separation evaporation crystallization mother liquor, the generated acid, alkali and sodium bicarbonate can be utilized in the wastewater pretreatment subsystem, so that recycling circulation is realized; the produced ammonium sulfate and ammonium chloride are nitrogen fertilizers widely applied in the agricultural field and can be sold as products.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a block diagram of a processing system for recycling a mother liquor of salt evaporation crystallization according to an embodiment of the present application;
FIG. 2 is a schematic view of a processing system for resource utilization of a mother liquor of salt separation evaporation crystallization according to an embodiment of the present application;
fig. 3 is a flowchart of a processing method for resource utilization of a salt separation evaporation crystallization mother liquor according to another embodiment of the present application.
In the figure, 1, a wastewater pretreatment subsystem; 11. a chemical precipitation hardness removal device; 12. a filtering and impurity removing device; 121. a multi-media filter; 122. ultrafiltration membranes; 13. a COD removal device; 2. an electrodialysis bipolar membrane subsystem; 21. a bipolar membrane device; 3. an ammonia-soda production subsystem; 31. adjusting the homogenizing device; 32. a sodium bicarbonate preparation device; 33. an ammonium sulfate evaporation crystallization device; 34. an ammonium chloride cold separation crystallization device; 341. a freezing heat exchanger; 342. a crystallizer; 35. a first filter; 36. a sodium bicarbonate storage tank; 37. a second filter; 38. an ammonium sulfate storage tank; 39. a third filter; 391. and (4) an ammonium chloride storage tank.
Detailed Description
The embodiments of the present application will be described in detail below with reference to the accompanying drawings.
It should be understood that the embodiments described are only a few embodiments of the present application, 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 application.
As shown in fig. 1, the present application provides a treatment system for recycling a salt separation evaporation crystallization mother liquor, which may include a wastewater pretreatment subsystem 1, an electrodialysis bipolar membrane subsystem 2, and an ammonia-soda preparation subsystem 3.
Wherein, the wastewater pretreatment subsystem 1 is used for removing hardness, suspended matters and COD in the sodium chloride mother liquor. The sodium chloride mother liquor is introduced into the wastewater pretreatment subsystem 1 from a sodium chloride evaporation crystallization device.
The electrodialysis bipolar membrane subsystem 2 is communicated with the wastewater pretreatment subsystem 1 and receives mother liquor discharged by the wastewater pretreatment subsystem 1, and the mother liquor discharged by the wastewater pretreatment subsystem 1 is treated to prepare hydrochloric acid and sodium hydroxide.
The ammonia-soda preparation subsystem 3 is connected with the electrodialysis bipolar membrane subsystem 2 and receives the sodium sulfate mother liquor and the mother liquor treated by the electrodialysis bipolar membrane subsystem 2, and the ammonia-soda preparation subsystem 3 homogenizes the two mother liquors to prepare sodium bicarbonate, ammonium sulfate and ammonium chloride. The mother liquor of sodium sulfate is introduced into the ammonia-soda production subsystem 3 from a sodium sulfate evaporation crystallization device.
This embodiment, get rid of impurity such as hardness, COD, suspended solid of sodium chloride mother liquor through waste water pretreatment subsystem 1, utilize electrodialysis bipolar membrane technique to prepare into acid, alkali with the mother liquor of high concentration, the mother liquor of the low concentration of electrodialysis bipolar membrane output mixes with sodium sulfate mother liquor, rethread double decomposition reaction preparation sodium bicarbonate, ammonium chloride and ammonium sulfate, furthest reduces the production of miscellaneous salt in the zero discharge system, recycle mother liquor resource, thereby realize industrial waste water "zero release"'s target, alleviateed the miscellaneous salt treatment cost of enterprise when the environmental protection.
Referring to fig. 2, in an embodiment of the present embodiment, the wastewater pretreatment subsystem 1 may include a chemical precipitation and hardness removal device 11, a filtration and impurity removal device 12, and a COD removal device 13, which are sequentially connected.
The chemical precipitation hardness removing device 11 adopts a hardness removing medicament, a flocculation coagulation assisting medicament and an acid-base neutralizing medicament to treat the sodium chloride mother liquor so as to remove the hardness in the mother liquor.
Specifically, the hardness removing agent can include, but is not limited to, sodium hydroxide, sodium bicarbonate, and sodium metaaluminate, wherein the concentration of sodium metaaluminate is 32-40%, sodium hydroxide removes magnesium hardness, sodium bicarbonate removes calcium hardness, and sodium metaaluminate removes silicon hardness.
The flocculation coagulant aid is PAM and PFS but not limited to PAM and PFS, can increase the volume of flocs and improve the sedimentation speed, and the formed flocs have good sedimentation performance and high strength, thereby improving the solid-liquid separation effect.
The acid-base neutralizing agent is hydrochloric acid or sulfuric acid to adjust the pH value of the mother solution.
The COD removing device 13 is used for carrying out adsorption exchange on the mother liquor treated by the filtering and impurity removing device 12 so as to remove COD and residual hardness in the mother liquor.
In an embodiment of this embodiment, the chemical precipitation and hardness removal device 11 may be a high-efficiency sedimentation tank, or a micro-vortex sedimentation tank; the filtering and impurity removing device 12 can be a fiber filter/V-shaped filter, or a multi-media filter 121, in this embodiment, the filtering and impurity removing device 12 includes the multi-media filter 121 and an ultrafiltration membrane 122; the COD removing device 13 may be a chelate resin tower or an advanced oxidation device. It should be noted that, the selection may be flexibly and reasonably selected according to actual situations, and this embodiment is not particularly limited to this.
During specific operation, make the sodium chloride mother liquor get into chemical precipitation unhairing device 11, add the unhairing medicament, flocculation coagulation aiding medicament, let the medicament fully react the back and produce the flocculation deposit, through high-efficient sedimentation tank clarification sediment, with the precipitate and the mother liquor separation in the mother liquor, make the suspended solid of mother liquor be less than 10mg/L, add the pH that acid-base neutralization medicament adjusted the mother liquor 6-9, and make the mother liquor suspended solid be less than 1mg/L through filtering miscellaneous device 12, COD remove device 13 reduces the mother liquor organic pollutant, reach the quality of water index of intaking of electrodialysis bipolar membrane subsystem 2.
In one embodiment of this embodiment, the electrodialysis bipolar membrane subsystem 2 may include a bipolar membrane device 21, and the bipolar membrane device 21 is configured to receive the mother liquor discharged from the wastewater pretreatment subsystem 1 and process the mother liquor discharged from the wastewater pretreatment subsystem 1 to obtain hydrochloric acid and sodium hydroxide.
In this embodiment, the sodium chloride content of the mother liquor generated by treating the sodium chloride mother liquor by the bipolar membrane device 21 is lower than 10%, and is lower than the crystallization point of ammonium chloride (the solubility of ammonium chloride at 80 ℃ is 65.6 g) after mixing with the sodium sulfate mother liquor and heating up, evaporating and crystallizing.
The acid solution and the alkali solution prepared by the bipolar membrane device 21 can be provided by the condensed water of the ammonium sulfate evaporation crystallization device 33, the bipolar membrane device 21 produces about 10 percent of sodium hydroxide and 8 percent of hydrochloric acid, and the acid solution and the alkali solution can be used for regenerating and replacing resin in the wastewater pretreatment subsystem 1 and can also be used for adjusting pH as a hardness removing agent.
In an embodiment of this embodiment, the ammonia-soda preparation subsystem 3 may include a conditioning homogenizing device 31, a sodium bicarbonate preparation device 32, an ammonium sulfate evaporation crystallization device 33, and an ammonium chloride cold-separation crystallization device 34, which are connected in sequence.
The adjusting and homogenizing device 31 is used for receiving the sodium sulfate mother liquor and the mother liquor treated by the electrodialysis bipolar membrane subsystem 2, and the adjusting and homogenizing device 31 adjusts and homogenizes the two mother liquors to form the homogenized mother liquor.
The sodium bicarbonate preparation device 32 is configured to receive the homogenized mother liquor from the homogenizing device 31, simultaneously introduce ammonia gas and carbon dioxide into the sodium bicarbonate preparation device 32 to generate a sodium bicarbonate precipitate with a low solubility, filter the sodium bicarbonate precipitate through the first filter 35 to obtain sodium bicarbonate and heavy alkali mother liquor, collect the sodium bicarbonate into a sodium bicarbonate storage tank 36 connected to the first filter 35, and enter the next process with the heavy alkali mother liquor.
The ammonium sulfate evaporative crystallization device 33 is used for carrying out evaporative crystallization on the heavy alkali mother liquor to obtain ammonium sulfate and ammonium sulfate mother liquor, the ammonium sulfate and the ammonium sulfate mother liquor are filtered by the second filter 37, the ammonium sulfate is collected into an ammonium sulfate storage tank 38 connected with the second filter 37, and the ammonium sulfate mother liquor enters the next process.
The ammonium chloride cold-separation crystallization device 34 is used for cooling the ammonium sulfate mother liquor to obtain ammonium chloride and ammonium chloride mother liquor, the ammonium chloride and the ammonium chloride mother liquor are filtered by the third filter 39, the ammonium chloride is collected in an ammonium chloride storage tank 391 connected with the third filter 39, and the ammonium chloride mother liquor returns to the chemical precipitation hardness removal device 11.
Specifically, ammonia and carbon dioxide are introduced into the homogenized mother liquor of the homogenizing device 31 to generate sodium bicarbonate sediment with low solubility, the carbon dioxide and the ammonia are derived from the acid gas treatment process, the pollution reduction and carbon reduction synergistic effect is realized, the collected sodium bicarbonate can be used as a hardness removal agent in the wastewater pretreatment subsystem 1 to reduce calcium hardness in the mother liquor, and the sodium bicarbonate can be calcined again as required to obtain a sodium carbonate product. The heavy alkali mother liquor is evaporated and crystallized, and the temperature of an ammonium sulfate evaporation and crystallization device 33 is 80-110 ℃, so that an ammonium sulfate product is separated out. The condensed water evaporated by the ammonium sulfate evaporative crystallization device 33 can be returned to the bipolar membrane device 21 for use, and the conductance of the condensed water is less than 300us/cm, which is superior to the water quality of industrial water. And (3) freezing and heat exchanging the ammonium chloride mother liquor, reducing the temperature to 20-35 ℃ (the solubility of ammonium chloride at 20 ℃ is 37.2 g), and separating out an ammonium chloride product by cold precipitation.
In one embodiment of this embodiment, the ammonium sulfate evaporative crystallization device 33 may employ an MVR evaporator; the ammonium chloride cryo-crystallization device 34 may include a freezing heat exchanger 341 and a crystallizer 342.
The processing system that salt separation evaporative crystallization mother liquor resource utilization that this application embodiment provided can change evaporative crystallization mother liquor into sulphuric acid, sodium hydroxide, sodium carbonate/sodium bicarbonate and ammonium chloride and ammonium sulfate, reduces the production of miscellaneous salt among the zero discharge system to furthest, recycles the mother liquor resource to realize the target of industrial waste water "zero release", alleviateed the miscellaneous salt treatment cost of enterprise when environmental protection.
As shown in fig. 3, an embodiment of the present application provides a treatment method for resource utilization of a mother liquor of salt separation evaporative crystallization, which may include the following steps:
s101, introducing one of mother liquor of sodium chloride mother liquor into a wastewater pretreatment subsystem 1, and removing hardness, suspended matters and COD in the mother liquor;
s102, introducing the mother liquor with the hardness, suspended matters and COD removed into an electrodialysis bipolar membrane subsystem 2 for electrodialysis treatment to prepare hydrochloric acid and sodium hydroxide and obtain new mother liquor;
s103, introducing the new mother liquor and the sodium sulfate mother liquor into an ammonia-soda preparation subsystem 3 to homogenize the two mother liquors to form a homogeneous mother liquor, introducing ammonia gas and carbon dioxide into the homogeneous mother liquor to obtain sodium bicarbonate, performing evaporative crystallization to obtain ammonium sulfate, and performing cold crystallization to obtain ammonium chloride.
In an embodiment of this embodiment, one of the mother solutions of sodium chloride is introduced into the wastewater pretreatment subsystem 1 to remove hardness, suspended matters, and COD in the mother solution (step S101), which may further include:
S101A, introducing one strand of mother liquor of the sodium chloride mother liquor into a chemical precipitation and hardness removal device 11, and adding a hardness removal medicament, a flocculation coagulation aid medicament and an acid-base neutralization medicament into the sodium chloride mother liquor to treat the sodium chloride mother liquor so as to remove hardness in the mother liquor.
The chemical precipitation hardness removal device 11 can select a high-efficiency sedimentation tank or a micro-vortex sedimentation tank, and the high-efficiency sedimentation tank is selected in the embodiment.
The hardness removing agent can include, but is not limited to, sodium hydroxide, sodium bicarbonate and sodium metaaluminate, wherein the concentration of sodium metaaluminate is 32-40%, sodium hydroxide removes magnesium hardness, sodium bicarbonate removes calcium hardness, and sodium metaaluminate removes silicon hardness.
The flocculation coagulant aid is PAM and PFS but not limited to PAM and PFS, can increase the volume of flocs and improve the sedimentation speed, and the formed flocs have good sedimentation performance and high strength, thereby improving the solid-liquid separation effect.
The acid-base neutralizing agent is hydrochloric acid or sulfuric acid to adjust the pH value of the mother solution.
S101B, introducing the mother liquor treated by the chemical precipitation hardness removal device 11 into a filtration and impurity removal device 12 for filtration so as to remove turbidity and suspended matters in the mother liquor and reduce the SDI value of the mother liquor.
The filtering and impurity removing device 12 can comprise a multi-medium filter 121 and an ultrafiltration membrane 122 which are communicated with each other. The multi-media filter 121 is connected with a high-efficiency sedimentation tank.
S101C, introducing the mother liquor treated by the filtration and impurity removal device 12 into a COD removal device 13 for adsorption exchange so as to remove COD and residual hardness in the mother liquor.
The COD removing device 13 can be a chelating resin tower or an advanced oxidation device. In this embodiment, a chelating resin column is used, and the chelating resin column is connected to the ultrafiltration membrane 122.
In an embodiment of this embodiment, the introducing new mother liquor and sodium sulfate mother liquor into the ammonia-soda production subsystem 3 to homogenize two mother liquors to form a homogeneous mother liquor, and introducing ammonia gas and carbon dioxide into the homogeneous mother liquor to obtain sodium bicarbonate, and crystallizing by evaporation to obtain ammonium sulfate, and crystallizing by cold precipitation to obtain ammonium chloride (step S103), may further include:
S103A, feeding the mother liquor treated by the electrodialysis bipolar membrane subsystem 2 and the sodium sulfate mother liquor into the adjusting and homogenizing device 31, and adjusting and homogenizing the two mother liquors by the adjusting and homogenizing device 31 to form a homogenized mother liquor.
And S103B, introducing the homogenized mother liquor into the sodium bicarbonate preparation device 32, and simultaneously introducing ammonia gas and carbon dioxide into the sodium bicarbonate preparation device 32 to generate sodium bicarbonate precipitate with low solubility.
S103C, the sodium bicarbonate precipitate is led into a first filter 35, after filtration, the sodium bicarbonate is collected into a sodium bicarbonate storage tank 36 by filtration, and the heavy alkali mother liquor enters an ammonium sulfate evaporation crystallization device 33.
S103D, and the ammonium sulfate evaporative crystallization device 33 performs evaporative crystallization on the heavy alkali mother liquor to obtain ammonium sulfate and ammonium sulfate mother liquor.
S103E, the ammonium sulfate and the ammonium sulfate mother liquor are introduced into a second filter 37, the ammonium sulfate is collected into an ammonium sulfate storage tank 38 after filtration, and the ammonium sulfate mother liquor enters an ammonium chloride cold separation crystallization device 34.
The ammonium chloride cold separation crystallization device 34 comprises a freezing heat exchanger 341 and a crystallizer 342 which are connected with each other, and a second filter 37 is connected with the freezing heat exchanger 341.
S103F, the freezing heat exchanger 341 performs freezing heat exchange on the ammonium sulfate mother liquor, and the ammonium chloride mother liquor are obtained through evaporation and crystallization by a crystallization device.
S103G, feeding the ammonium chloride and the ammonium chloride mother liquor into the third filter 39, filtering, collecting the ammonium chloride into an ammonium chloride storage tank 391, and returning the ammonium chloride mother liquor to the chemical precipitation and hardness removal device 11.
The method embodiment of the present application is a method for executing the system embodiment, and the implementation principle and the technical effect are similar, and are not described herein again.
In this embodiment, the steps are sequentially performed, and sodium bicarbonate produced after the salt separation evaporation crystallization mother liquor is subjected to resource treatment can reach the standards of class iii and above in GB/T1606-2008; the produced ammonium chloride meets the requirements of GB/T2946-2018 products, and the ammonium sulfate meets the requirements of GB/T535-2020 products, and can be sold as products. The condensate evaporated can be returned to the bipolar membrane device for use when preparing acid liquor and alkali liquor, and the conductance of the condensate is less than 300us/cm, which is superior to the water quality of industrial water. The bipolar membrane device produces about 10% of sodium hydroxide and 8% of hydrochloric acid, and the acid solution and the alkali solution of the part can be used for regenerating and replacing resin in a wastewater pretreatment subsystem and can also be used for adjusting the pH value as a hardness removing agent.
The whole process flow can utilize the evaporated and crystallized mother liquor as resources without mixing the mother liquor to generate miscellaneous salt, and the disposal cost of each ton of miscellaneous salt is about 5000-7000 yuan according to the method that the salt mud which is generated by the waste water treatment of the coal chemical industry and cannot be utilized as resources is managed temporarily according to the dangerous waste in the environmental access condition of the modern coal chemical engineering construction project. The invention can greatly reduce the production cost of enterprises and reduce the pressure of the enterprises.
In this embodiment, the electrodialysis bipolar membrane subsystem controls the ion concentration ratio of the two mother solutions after mixing, so that the concentration of ammonium chloride is lower than the crystallization point during evaporation crystallization, and the concentration of ammonium sulfate is lower than the crystallization point during cold crystallization, thereby ensuring the quality of ammonium sulfate and ammonium chloride products.
In summary, the embodiment of the application provides a treatment method for resource utilization of a salt separation evaporative crystallization mother liquor, which comprises the steps of firstly removing impurities such as hardness, COD (chemical oxygen demand), suspended matters and the like in a sodium chloride mother liquor through a wastewater pretreatment subsystem, meeting the water inlet requirement of a bipolar membrane device, then communicating with the wastewater pretreatment subsystem through an electrodialysis bipolar membrane subsystem, receiving the mother liquor continuously discharged by the wastewater pretreatment subsystem, and treating the mother liquor continuously discharged by the wastewater pretreatment subsystem to prepare hydrochloric acid and sodium hydroxide; meanwhile, the sodium sulfate evaporative crystallization mother liquor is received by the ammonia-soda preparation subsystem, and the low-concentration mother liquor generated by the electrodialysis bipolar membrane subsystem is received, and the two mother liquors are homogenized by the ammonia-soda preparation subsystem to prepare sodium bicarbonate, ammonium sulfate and ammonium chloride. In addition, the acid liquor and the alkali liquor generated by the electrodialysis bipolar membrane subsystem can be used in the wastewater pretreatment subsystem. The method mainly solves the problems of resource utilization of the evaporative crystallization mother liquor and stability of the evaporative crystallization mother liquor after mixing, perfects the closed loop with zero discharge in the wastewater industry, and realizes the resource circulation of the wastewater while protecting the environment.
It should be noted that, in this document, the emphasis points of the solutions described in the embodiments are different, but there is a certain correlation between the embodiments, and when understanding the solution of the present application, the embodiments may be referred to each other; moreover, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a processing system that divides salt evaporation crystallization mother liquor utilization as a resource which characterized in that includes:
the wastewater pretreatment subsystem (1) is used for removing hardness, suspended matters and COD in the sodium chloride mother liquor;
the electrodialysis bipolar membrane subsystem (2) is communicated with the wastewater pretreatment subsystem (1) and receives mother liquor discharged by the wastewater pretreatment subsystem (1), and the mother liquor discharged by the wastewater pretreatment subsystem (1) is treated to prepare hydrochloric acid and sodium hydroxide;
and the ammonia-soda preparation subsystem (3) is connected with the electrodialysis bipolar membrane subsystem (2) and is used for receiving the sodium sulfate mother liquor and the mother liquor treated by the electrodialysis bipolar membrane subsystem (2), and the ammonia-soda preparation subsystem (3) is used for homogenizing the two mother liquors to prepare sodium bicarbonate, ammonium sulfate and ammonium chloride.
2. The treatment system for recycling mother liquor of salt separation evaporation crystallization according to claim 1, characterized in that: the wastewater pretreatment subsystem (1) comprises a chemical precipitation hardness removal device (11), a filtration impurity removal device (12) and a COD removal device (13) which are communicated in sequence;
the chemical precipitation hardening removal device (11) adopts a hardening removal medicament, a flocculation coagulation aid medicament and an acid-base neutralization medicament to treat the sodium chloride mother liquor so as to remove the hardness in the mother liquor;
the filtering and impurity removing device (12) is used for filtering the mother liquor treated by the chemical precipitation and hardness removing device (11) so as to remove turbidity and suspended matters in the mother liquor and reduce the SDI value of the mother liquor;
the COD removing device (13) is used for carrying out adsorption exchange on the mother liquor treated by the filtering and impurity removing device (12) so as to remove COD and residual hardness in the mother liquor.
3. The treatment system for recycling mother liquor of salt separation evaporation crystallization according to claim 2, characterized in that: the hardness removing agent comprises sodium hydroxide, sodium bicarbonate and sodium metaaluminate; the flocculation coagulant aid is PAM and PFS; the acid-base neutralizing agent is hydrochloric acid or sulfuric acid.
4. The treatment system for recycling mother liquor of salt separation evaporation crystallization according to claim 2, characterized in that: the filtering and impurity removing device (12) comprises a multi-medium filter (121) and an ultrafiltration membrane (122).
5. The treatment system for recycling mother liquor of salt separation evaporation crystallization according to claim 2, characterized in that: the COD removing device (13) is a resin tower.
6. The treatment system for recycling mother liquor of salt separation evaporation crystallization according to claim 1, characterized in that: the electrodialysis bipolar membrane subsystem (2) comprises a bipolar membrane device (21), wherein the bipolar membrane device (21) is used for receiving the mother liquor discharged by the wastewater pretreatment subsystem (1) and treating the mother liquor discharged by the wastewater pretreatment subsystem (1) to prepare hydrochloric acid and sodium hydroxide.
7. The treatment system for recycling mother liquor of salt separation evaporation crystallization according to claim 2, characterized in that: the ammonia-soda preparation subsystem (3) comprises a regulating homogenizing device (31), a sodium bicarbonate preparation device (32), an ammonium sulfate evaporation crystallization device (33) and an ammonium chloride cold separation crystallization device (34) which are communicated in sequence;
the adjusting and homogenizing device (31) is used for receiving a sodium sulfate mother liquor and a mother liquor treated by the electrodialysis bipolar membrane subsystem (2), and the adjusting and homogenizing device (31) adjusts and homogenizes the two mother liquors to form a homogenized mother liquor;
the sodium bicarbonate preparation device (32) is used for receiving the homogenized mother liquor of the adjusting homogenizing device (31), and simultaneously introducing ammonia gas and carbon dioxide into the sodium bicarbonate preparation device (32) to generate sodium bicarbonate precipitate so as to obtain sodium bicarbonate and heavy alkali mother liquor;
the ammonium sulfate evaporation crystallization device (33) is used for carrying out evaporation crystallization on the heavy alkali mother liquor so as to obtain ammonium sulfate and ammonium sulfate mother liquor;
and the ammonium chloride cold-separation crystallization device (34) is used for cooling the ammonium sulfate mother liquor to obtain ammonium chloride and ammonium chloride mother liquor, and the ammonium chloride mother liquor returns to the chemical precipitation hardness removal device (11).
8. The treatment system for recycling mother liquor of salt separation evaporation crystallization according to claim 7, characterized in that: the ammonium sulfate evaporation crystallization device (33) is an MVR evaporator; the ammonium chloride cold-separation crystallization device (34) comprises a freezing heat exchanger (341) and a crystallizer (342).
9. A treatment method for resource utilization of a salt separation evaporation crystallization mother liquor is characterized by comprising the following steps:
one of the mother liquor of the sodium chloride mother liquor is led into a wastewater pretreatment subsystem (1) to remove the hardness, suspended matters and COD in the mother liquor;
introducing the mother liquor with hardness, suspended matters and COD removed into an electrodialysis bipolar membrane subsystem (2) for electrodialysis treatment to prepare hydrochloric acid and sodium hydroxide and obtain new mother liquor;
and introducing the new mother liquor and the sodium sulfate mother liquor into an ammonia-soda preparation subsystem (3) to homogenize the two mother liquors to form a homogeneous mother liquor, introducing ammonia gas and carbon dioxide into the homogeneous mother liquor to obtain sodium bicarbonate, crystallizing by evaporation to obtain ammonium sulfate, and crystallizing by cold precipitation to obtain ammonium chloride.
10. The treatment method for recycling mother liquor from salt separation evaporation and crystallization according to claim 9, wherein one mother liquor of the sodium chloride mother liquor is introduced into the wastewater pretreatment subsystem (1) to remove hardness, suspended solids and COD in the mother liquor, and the treatment method comprises the following steps:
introducing one strand of mother liquor of the sodium chloride mother liquor into a chemical precipitation hardness removal device (11), and adding a hardness removal medicament, a flocculation coagulation aid medicament and an acid-base neutralization medicament into the sodium chloride mother liquor to treat the sodium chloride mother liquor so as to remove the hardness in the mother liquor;
the mother liquor treated by the chemical precipitation hardness removal device (11) is introduced into a filtration impurity removal device (12) for filtration so as to remove turbidity and suspended matters in the mother liquor and reduce the SDI value of the mother liquor;
and (3) introducing the mother liquor treated by the filtering and impurity removing device (12) into a COD removing device (13) for adsorption exchange so as to remove COD and residual hardness in the mother liquor.
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| CN108358369A (en) * | 2018-03-09 | 2018-08-03 | 江苏中圣高科技产业有限公司 | A kind of brine waste is concentrated by evaporation mother liquor and divides salt treatment process method and device |
| CN108929708A (en) * | 2018-06-26 | 2018-12-04 | 浙江奇彩环境科技股份有限公司 | Sodium chloride abraum salt recycling processing method during a kind of DYE PRODUCTION |
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| CN106082281A (en) * | 2016-06-14 | 2016-11-09 | 史永军 | Process with sodium sulfate preparing soda |
| CN106865571A (en) * | 2017-03-20 | 2017-06-20 | 科莱环境工程（北京）有限公司 | A kind of method that chemical industry strong brine produces sodium bicarbonate and ammonium sulfate |
| CN108358369A (en) * | 2018-03-09 | 2018-08-03 | 江苏中圣高科技产业有限公司 | A kind of brine waste is concentrated by evaporation mother liquor and divides salt treatment process method and device |
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