CN116514348A - High salinity wastewater treatment process - Google Patents
High salinity wastewater treatment process Download PDFInfo
- Publication number
- CN116514348A CN116514348A CN202310737568.0A CN202310737568A CN116514348A CN 116514348 A CN116514348 A CN 116514348A CN 202310737568 A CN202310737568 A CN 202310737568A CN 116514348 A CN116514348 A CN 116514348A
- Authority
- CN
- China
- Prior art keywords
- wastewater
- treatment
- water
- reverse osmosis
- crystallization
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 65
- 230000008569 process Effects 0.000 title claims abstract description 58
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 39
- 239000002351 wastewater Substances 0.000 claims abstract description 123
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 150000003839 salts Chemical class 0.000 claims abstract description 39
- 238000002425 crystallisation Methods 0.000 claims abstract description 37
- 230000008025 crystallization Effects 0.000 claims abstract description 37
- 238000001704 evaporation Methods 0.000 claims abstract description 25
- 230000008020 evaporation Effects 0.000 claims abstract description 20
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 20
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 17
- 238000001728 nano-filtration Methods 0.000 claims abstract description 14
- 230000003647 oxidation Effects 0.000 claims abstract description 13
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 12
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 12
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 12
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011780 sodium chloride Substances 0.000 claims abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 239000012528 membrane Substances 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 19
- 239000000126 substance Substances 0.000 claims description 15
- 239000003814 drug Substances 0.000 claims description 14
- 239000013078 crystal Substances 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 11
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- 238000001556 precipitation Methods 0.000 claims description 7
- 238000000108 ultra-filtration Methods 0.000 claims description 7
- 238000000909 electrodialysis Methods 0.000 claims description 6
- 239000003344 environmental pollutant Substances 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 231100000719 pollutant Toxicity 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 239000003153 chemical reaction reagent Substances 0.000 claims description 5
- -1 fluoride ions Chemical class 0.000 claims description 5
- 230000008014 freezing Effects 0.000 claims description 5
- 238000007710 freezing Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 4
- 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 4
- 239000000460 chlorine Substances 0.000 claims description 4
- 229910052801 chlorine Inorganic materials 0.000 claims description 4
- 238000005868 electrolysis reaction Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 229910021645 metal ion Inorganic materials 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000011591 potassium Substances 0.000 claims description 3
- 229910052700 potassium Inorganic materials 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 239000001488 sodium phosphate Substances 0.000 claims description 3
- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 3
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229940079593 drug Drugs 0.000 claims description 2
- 239000004902 Softening Agent Substances 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 10
- 238000004064 recycling Methods 0.000 abstract description 7
- 238000000746 purification Methods 0.000 abstract description 5
- 238000000926 separation method Methods 0.000 abstract description 5
- 238000006115 defluorination reaction Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 12
- 239000000047 product Substances 0.000 description 10
- 239000012535 impurity Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 241000894006 Bacteria Species 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000003487 electrochemical reaction Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 150000001450 anions Chemical class 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000002207 thermal evaporation Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
Classifications
-
- 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
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- 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
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F1/441—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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- 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
- C02F5/02—Softening water by precipitation of the hardness
-
- 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
- C02F5/02—Softening water by precipitation of the hardness
- C02F5/04—Softening water by precipitation of the hardness using phosphates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Abstract
The invention relates to the technical field of wastewater treatment, in particular to a high-salinity wastewater treatment process. The method comprises pretreatment, concentrated water treatment and evaporative crystallization treatment; the pretreatment comprises defluorination/softening treatment, pre-ozone oxidation and reverse osmosis treatment; the concentrated water treatment comprises the steps of concentrated water defluorination/softening treatment, post ozone treatment, nanofiltration salt separation and reverse osmosis treatment; the evaporation crystallization treatment comprises sodium sulfate crystallization, sodium chloride crystallization and mixed salt treatment; in the high salinity wastewater treatment process, the pretreatment, the concentrated water treatment and the evaporative crystallization are combined to jointly realize wastewater purification and resource recycling, and the combination of the pretreatment, the concentrated water treatment and the evaporative crystallization can effectively improve the quality of wastewater, reduce the energy consumption in the treatment process and improve the treatment efficiency and the economy of the whole process flow.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a high-salinity wastewater treatment process.
Background
The environmental pollution problem is becoming serious, the environmental protection consciousness is improved, the emission of pollutants, especially the pollution waste water in industrial production is reduced, which is one of the important reasons for causing the environmental pollution, and how to treat the emission of the industrial pollution waste water becomes an important measure for reducing the environmental pollution.
At present, in the high salinity wastewater treatment process, the prior art generally adopts the high salinity seawater desalination and wastewater treatment technology based on electrochemical reaction, the technology utilizes the electrochemical reaction to treat the brine and the wastewater through oxidation-reduction reaction, and an electrolytic cell or an electric absorber is used for removing or trapping the brine and the wastewater. However, this technique has some problems; firstly, the problem of energy consumption is solved, and a large amount of electric energy is needed in the electrochemical reaction process, so that the technology has very high energy consumption and high cost in practical application. Secondly, the cost problem is that the cost of the electrochemical reaction equipment is high, so that the threshold of the application of the technology is high, and the technology cannot be suitable for places with smaller scale such as hospitals, schools and the like. In addition, the technology has poor treatment effect on metastable state solution, and a certain amount of salt and harmful substances still exist in the treated solution, so that a certain treatment standard is difficult to reach.
Secondly, in order to recover salts in the high-salinity wastewater, evaporating water in the wastewater to separate out and recover the salts; but this technique has some problems. First, energy consumption is a problem. A large amount of evaporation heat is needed for evaporating the wastewater, so that the energy consumption and the cost are high. Second, it is difficult to treat wastewater of high salt concentration. The high-salt concentration wastewater needs higher temperature and time for evaporation concentration, and the technical process is complex and difficult to realize application. In addition, the evaporation residue after treatment is complex, and needs to be further treated and recycled, so that the treatment difficulty and the treatment cost are increased.
In view of the above, there is an urgent need for a high salinity wastewater treatment process capable of recovering salts of high salinity wastewater, reducing energy consumption in concentration and crystallization processes, and improving wastewater treatment efficiency, to improve the shortcomings of the prior art.
Disclosure of Invention
The present invention aims to provide a high salinity wastewater treatment process to solve the problems set forth in the background art.
In order to achieve the above object, the present invention provides a high salinity wastewater treatment process including pretreatment, concentrated water treatment and evaporative crystallization treatment;
the pretreatment steps are as follows:
s1.1, wastewater enters a middle water tank, the water quality of the wastewater is regulated, then the wastewater enters a dosing tank, a drug and a softener are added, and suspended solid particles and turbid substances in the water are removed through precipitation;
s1.2, the wastewater enters a filter tank to remove particles and suspended matters in the wastewater; the filtered wastewater enters an oxidation pond, ozone gas is injected into the wastewater, so that oxygen in the wastewater is in close contact with other pollutants in the wastewater, and oxidation reaction occurs;
s1.3, enabling the oxidized wastewater to enter a reverse osmosis system, and treating the wastewater by adopting a deionized membrane;
the pretreatment is used for pretreating the original high-salinity wastewater, and mainly aims to remove solid suspended matters, soil, sand grains, particulate organic matters and the like in the wastewater, so that the work load of a subsequent treatment unit is reduced, the impurity content in the wastewater can be reduced, the blockage of a crystallizer pipeline and the like and the damage of equipment are avoided, the pretreatment unit can separate liquid from solid, separate the liquid from waste residues, and reduce the energy consumption in the concentration and crystallization processes; therefore, in the wastewater treatment process, the pretreatment process can effectively improve the quality of wastewater, prolong the service life of equipment, improve the treatment efficiency and reduce the cost of subsequent procedures;
the concentrated water treatment steps are as follows:
s2.1, adding a reagent into the pretreated wastewater, adjusting the pH value and the water quality, then enabling the wastewater to enter a grid medicine tank to remove fluoride ions in the wastewater, enabling the wastewater to enter a reaction tank after passing through the grid medicine tank, and carrying out a small amount of precipitation;
s2.2, removing suspended substances and particulate matters in the wastewater by adopting a multi-medium filter, introducing the wastewater subjected to multi-medium filtration into a post-ozone oxidation pond for oxidation treatment, and introducing the oxidized water into ultrafiltration membrane equipment for ultrafiltration;
s2.3, introducing the ultrafiltered wastewater into a resin softener, softening the wastewater, introducing the softened wastewater into a nanofiltration device, and separating out residual liquid;
s2.4, the wastewater after nanofiltration enters a reverse osmosis device, dissolved salts and trace solutes are removed through reverse osmosis membrane treatment in the reverse osmosis device, the wastewater is introduced into an electrodialysis device, and clean water subjected to electrodialysis is discharged from a water outlet;
the concentrated water treatment is used for improving the salt content and the treatment efficiency of the wastewater, and simultaneously, certain chemical treatment is carried out to further remove bacteria and harmful substances, so that the abrasion and blockage of equipment in the evaporation and crystallization processes are reduced, the treatment efficiency of the whole process system can be improved, the total cost of the process can be reduced, and the wastewater treatment effect is improved;
the evaporation crystallization treatment comprises the following steps:
s3.1, concentrating the residual liquid after nanofiltration treatment in an evaporator, conveying the concentrated wastewater into a freezing crystallizer, crystallizing sodium sulfate, separating the sodium sulfate from water, finally separating the crystals to melt, obtaining a sodium sulfate crystal product, and treating the residual liquid in a mixed salt;
s3.2, introducing the dissolved salt and the trace solute subjected to reverse osmosis treatment into an evaporator for heating and crystallizing, separating crystals in the wastewater, drying to obtain a pure sodium chloride crystal product, and introducing residual liquid into a mixed salt treatment;
s3.3, separating the residual liquid by adopting an electrolysis method to obtain valuable metal ions such as potassium, sodium, chlorine and the like;
the evaporation crystallization treatment is one of key steps of high-salinity wastewater treatment, salt in the wastewater can be gradually concentrated to a certain concentration by evaporating water, and then crystallization separation is carried out by freezing and thermal evaporation, so that the purposes of wastewater purification and salt resource recycling are achieved, and the energy utilization rate and economy of the whole wastewater treatment process can be improved.
As a further improvement of the technical scheme, in S1.1, the medicament adopts sodium hydroxide, and the softener adopts one of sodium phosphate and citric acid.
As a further improvement of the present technical solution, in S1.2, the ozone gas is produced by ultraviolet radiation.
As a further improvement of the present technical solution, in S2.1, the medicament adopts sodium hydroxide.
As a further improvement of the present technical solution, in S2.1, activated carbon and defluorinated resin particles are contained in the tank.
Compared with the prior art, the invention has the beneficial effects that:
1. in the high salinity wastewater treatment process, the pretreatment, the concentrated water treatment and the evaporative crystallization are combined to jointly realize wastewater purification and resource recycling, and the combination of the pretreatment, the concentrated water treatment and the evaporative crystallization can effectively improve the quality of wastewater, reduce the energy consumption in the treatment process and improve the treatment efficiency and the economy of the whole process flow.
1. In the high salinity wastewater treatment process, after impurities and solid suspended matters in wastewater are removed by pretreatment, water injection is sent to concentrated water treatment; the concentrated water treatment gradually increases the concentration of salts in water injection through a continuous concentration process, and simultaneously carries out certain chemical treatment to remove harmful organic matters and bacteria in the wastewater, reduce the abrasion and blockage of equipment in the evaporation and crystallization processes, further reduce the treatment cost, and then the concentrated wastewater enters the evaporation and crystallization process through a pipeline, and the salts obtained in the last step are further processed through the evaporation effect at low temperature or high temperature, so that the high-quality crystals are finally obtained.
2. In the high salinity wastewater treatment process, the treatment rate and the economy are improved, and as a large amount of impurities and solid suspended matters are removed by pretreatment, the normal operation of the evaporation crystallizer is ensured, so that the utilization rate of equipment is improved, and the treatment cost is reduced; the yield of the crystallizer is improved, the effect of concentration treatment can lead the salt in the evaporation crystallization unit to obtain higher yield, and the scale of the crystallization product has great influence on the output and operation of equipment and the effect of the subsequent process; the method reduces the discharge amount and the environmental pressure, reduces the discharge of high-salinity wastewater, reduces the pollution degree of the atmosphere, the water body and the land through the recycling of the wastewater, reduces the environmental pressure and lightens the burden of the earth.
Drawings
FIG. 1 is an overall flow diagram of the present invention;
FIG. 2 is a block diagram of a preprocessing flow of the present invention;
FIG. 3 is a block diagram of a concentrate treatment process according to the present invention;
FIG. 4 is a block diagram showing the flow of the evaporative crystallization process according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
According to the embodiment of the invention, as shown in fig. 1-4, a high salinity wastewater treatment process is provided, which comprises the following specific steps of:
1. pretreatment of
(1) Defluorination/softening treatment: the wastewater enters a middle water tank, the water quality of the wastewater is regulated, including parameters such as pH value, temperature and the like, then the wastewater enters a dosing tank, a reagent is added, sodium hydroxide is adopted for neutralizing the acidity of the wastewater, the pH value of the wastewater is gradually regulated to be within an ideal range, so that corrosion and membrane pollution to RO membranes are reduced, a softener is also added into the dosing tank, one of sodium phosphate and citric acid is adopted for removing calcium and magnesium ions in the water, the hardness of the water is reduced, and calcium, magnesium and silicate ions in the wastewater are combined with ions added with the reagent to generate corresponding precipitate particles, so that suspended solid particles and turbid substances in the water are removed through precipitation;
(2) Front ozone oxidation: the wastewater enters a filter tank, sand is adopted as a basic filter material in the filter tank, and the filter tank is used for removing particles and suspended matters in the wastewater; the wastewater is filtered when passing through the filter material layer, and clean water can flow out of the vertical pipe; the filtered wastewater enters an oxidation pond, ozone gas is produced by ultraviolet radiation, the ozone gas is injected into the wastewater, oxygen in the wastewater is closely contacted with other pollutants in the wastewater to perform oxidation reaction, the oxidation reaction is performed in the oxidation pond, and compounds such as organic matters, sulfides, methyl strength and the like in the wastewater are passivated, decomposed and the peculiar smell and chromaticity of a plurality of types of flow charges are eliminated, so that the effect of reducing membrane pollution is achieved;
(3) Reverse osmosis treatment: the wastewater subjected to oxidation treatment enters a reverse osmosis system, and is treated by adopting a deionized membrane, wherein the deionized membrane is placed between the high-salt wastewater and pure water in a pressure pipeline, and can block sodium and chlorine plasma, and finally the wastewater enters the next treatment step.
The pretreatment is used for pretreating the original high-salinity wastewater, and mainly aims to remove solid suspended matters, soil, sand grains, particulate organic matters and the like in the wastewater, so that the work load of a subsequent treatment unit is reduced, the impurity content in the wastewater can be reduced, the blockage of a crystallizer pipeline and the like and the damage of equipment are avoided, the pretreatment unit can separate liquid from solid, separate the liquid from waste residues, and reduce the energy consumption in the concentration and crystallization processes; therefore, in the wastewater treatment process, the pretreatment process can effectively improve the quality of wastewater, prolong the service life of equipment, improve the treatment efficiency and reduce the cost of subsequent procedures.
2. Concentrated water treatment
(1) Defluorination/softening treatment of concentrated water: adding sodium hydroxide serving as a reagent into the pretreated wastewater, adjusting the pH value and the water quality, then enabling the wastewater to enter a grid medicine tank, wherein active carbon and defluorinated resin particles are filled in the medicine tank, effectively removing fluorine ions in the wastewater, enabling the wastewater to enter a reaction tank after passing through the grid medicine tank, carrying out a small amount of precipitation, and carrying out hydrochloric acid or sodium hydroxide neutralization treatment according to the precipitation amount condition in the process;
(2) Post ozone treatment: the wastewater is filtered by a multi-medium filter to remove suspended matters and particulate matters in the wastewater, the wastewater after multi-medium filtration is introduced into a post ozone oxidation pond for oxidation treatment, the oxidized water enters ultrafiltration membrane equipment for ultrafiltration, and the contaminant matters with smaller molecular weight are removed by a filtration membrane, so that the purpose of solid particles is achieved;
(3) Nanofiltration and salt separation: the wastewater after ultrafiltration enters a resin softener to be softened, the softened wastewater enters a nanofiltration membrane in the nanofiltration membrane, residual liquid is separated when the wastewater passes through the nanofiltration membrane in the nanofiltration membrane and is used for subsequent sodium sulfate crystallization treatment, and the wastewater enters a reverse osmosis unit to be treated;
(4) Reverse osmosis treatment: the wastewater after nanofiltration enters a reverse osmosis device, more dissolved salts and trace solutes can be removed through reverse osmosis membrane treatment in the reverse osmosis device, the substances are used for subsequent sodium oxide crystallization treatment, the wastewater is introduced into an electrodialyzer, membranes and electrodes with alternate anions and cations are arranged in an electrodialysis membrane interlayer, the electrolysis process of selectively penetrating ions in the wastewater into corresponding ions is promoted through an externally applied electric field, cations are reverse-penetrated in the cathode direction, anions are reverse-penetrated in the anode direction, pollutants are separated to the anode side according to most anions, and the positive and negative ions are separated to the cathode side, so that the effective separation and removal of the ions are realized; the electrodialysis cleaning water is discharged from the water outlet.
The concentrated water treatment is used for improving the salt content and the treatment efficiency of the wastewater, and simultaneously carries out certain chemical treatment to further remove bacteria and harmful substances, reduce the abrasion and blockage of equipment in the evaporation and crystallization processes, not only improve the treatment efficiency of the whole process system, but also reduce the total cost of the process and improve the wastewater treatment effect.
3. Evaporative crystallization treatment
(1) Crystallization of sodium sulfate: the residual liquid after nanofiltration treatment enters an evaporator, the salt content in the wastewater is concentrated in an evaporation mode, the concentrated wastewater is conveyed into a freezing crystallizer, sodium sulfate is crystallized and then separated from water in a low-temperature cooling mode, finally the crystallization is separated out for melting, so that a pure sodium sulfate crystallization product is obtained, and the residual liquid enters a mixed salt treatment;
(2) Crystallizing sodium chloride; heating the dissolved salt and trace solute subjected to reverse osmosis treatment in an evaporator, gradually evaporating water until the salt is concentrated to a certain degree, crystallizing, separating crystals in the wastewater, drying to obtain a pure sodium chloride crystal product, and treating residual liquid in the presence of mixed salt;
(3) Treatment of mixed salt: and separating out the metal ions such as valuable potassium, sodium, chlorine and the like from the residual liquid by adopting an electrolysis method, and using the metal ions in various high-value chemical products in subsequent production places.
The evaporation crystallization treatment is one of key steps of high-salinity wastewater treatment, salt in the wastewater can be gradually concentrated to a certain concentration by evaporating water, and then crystallization separation is carried out by freezing and thermal evaporation, so that the purposes of wastewater purification and salt resource recycling are achieved, and the energy utilization rate and economy of the whole wastewater treatment process can be improved.
In the invention, the three parts of pretreatment, concentrated water treatment and evaporative crystallization are combined to jointly realize the purification and resource recycling of the wastewater, and the combination of the three parts can effectively improve the quality of the wastewater, reduce the energy consumption in the treatment process and improve the treatment efficiency and the economy of the whole process flow;
after impurities and solid suspended matters in the wastewater are removed by pretreatment, water injection is sent to concentrated water treatment; the concentrated water treatment gradually increases the concentration of salts in water injection through a continuous concentration process, and simultaneously carries out certain chemical treatment to remove harmful organic matters and bacteria in the wastewater, so that the abrasion and blockage of equipment in the evaporation and crystallization processes are reduced, the treatment cost is further reduced, then, the concentrated wastewater enters the evaporation and crystallization process through a pipeline, the salts obtained in the last step are further processed through the evaporation effect at low temperature or high temperature, and finally, a high-quality crystal is obtained, and the crystal can be directly used for producing salts and other chemical substances again;
in summary, the wastewater treatment process of the invention comprises the following steps: 1. the treatment rate and the economy are improved, and a large amount of impurities and solid suspended matters are removed by pretreatment, so that the normal operation of the evaporation crystallizer is ensured, the utilization rate of equipment is improved, and the treatment cost is reduced; 2. the yield of the crystallizer is improved, the effect of concentration treatment can lead the salt in the evaporative crystallization unit to obtain higher yield, and the scale of the crystallization product has great influence on the output and operation of equipment and the effect of the subsequent process; 3. the method has the advantages of reducing the discharge amount and the environmental pressure, reducing the discharge of high-salinity wastewater, reducing the pollution degree of the atmosphere, the water body and the land through the recycling of the wastewater, reducing the environmental pressure and relieving the burden of the earth.
In order to verify that the wastewater treatment provided in the embodiment of the present invention has a good wastewater treatment effect, the high salinity wastewater treatment process provided in the embodiment 1 of the present invention is described by the following examples.
Example 2
This example employs the high salinity wastewater treatment process provided in example 1, with a design water volume of 350m 3 And/h, specific detection indexes are shown in Table 1.
TABLE 1
，
According to the high salinity wastewater treatment process provided in the embodiment 1 of the invention, the design water quantity is 350m 3 At the time of/h, the annual reduction of the sewage discharge amount reaches 294 ten thousand tons, and the salt discharge amount is reduced to reach3.5 ten thousand tons are reduced, the ammonia nitrogen emission is reduced to 141 tons, and the COD emission is reduced to 555 tons; in addition, the sodium chloride product generated by wastewater treatment meets the standard of more than one grade of industrial dry salt in refined industrial salt in GB/T5462-2015, and the sodium sulfate product meets the standard of more than two classes of first-class products in GB/T6009-2014; therefore, the high-salinity wastewater treatment process provided by the invention has a good wastewater treatment effect, reduces pollutant discharge, improves wastewater utilization rate, and reduces cost.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The high salinity wastewater treatment process is characterized in that: comprises pretreatment, concentrated water treatment and evaporative crystallization treatment;
the pretreatment steps are as follows:
s1.1, wastewater enters a middle water tank, the water quality of the wastewater is regulated, then the wastewater enters a dosing tank, a drug and a softener are added, and suspended solid particles and turbid substances in the water are removed through precipitation;
s1.2, the wastewater enters a filter tank to remove particles and suspended matters in the wastewater; the filtered wastewater enters an oxidation pond, ozone gas is injected into the wastewater, so that oxygen in the wastewater is in close contact with other pollutants in the wastewater, and oxidation reaction occurs;
s1.3, enabling the oxidized wastewater to enter a reverse osmosis system, and treating the wastewater by adopting a deionized membrane;
the concentrated water treatment steps are as follows:
s2.1, adding a reagent into the pretreated wastewater, adjusting the pH value and the water quality, then enabling the wastewater to enter a grid medicine tank to remove fluoride ions in the wastewater, enabling the wastewater to enter a reaction tank after passing through the grid medicine tank, and carrying out a small amount of precipitation;
s2.2, removing suspended substances and particulate matters in the wastewater by adopting a multi-medium filter, introducing the wastewater subjected to multi-medium filtration into a post-ozone oxidation pond for oxidation treatment, and introducing the oxidized water into ultrafiltration membrane equipment for ultrafiltration;
s2.3, introducing the ultrafiltered wastewater into a resin softener, softening the wastewater, introducing the softened wastewater into a nanofiltration device, and separating out residual liquid;
s2.4, the wastewater after nanofiltration enters a reverse osmosis device, dissolved salts and trace solutes are removed through reverse osmosis membrane treatment in the reverse osmosis device, the wastewater is introduced into an electrodialysis device, and clean water subjected to electrodialysis is discharged from a water outlet;
the evaporation crystallization treatment comprises the following steps:
s3.1, concentrating the residual liquid after nanofiltration treatment in an evaporator, conveying the concentrated wastewater into a freezing crystallizer, crystallizing sodium sulfate, separating the sodium sulfate from water, finally separating the crystals to melt, obtaining a sodium sulfate crystal product, and treating the residual liquid in a mixed salt;
s3.2, introducing the dissolved salt and the trace solute subjected to reverse osmosis treatment into an evaporator for heating and crystallizing, separating crystals in the wastewater, drying to obtain a pure sodium chloride crystal product, and introducing residual liquid into a mixed salt treatment;
s3.3, separating the residual liquid by adopting an electrolysis method to obtain valuable metal ions such as potassium, sodium, chlorine and the like.
2. The high salinity wastewater treatment process according to claim 1, wherein: in the step S1.1, the medicament adopts sodium hydroxide, and the softening agent adopts one of sodium phosphate and citric acid.
3. The high salinity wastewater treatment process according to claim 1, wherein: in S1.2, ozone gas is produced by ultraviolet radiation.
4. The high salinity wastewater treatment process according to claim 1, wherein: in S2.1, the medicament adopts sodium hydroxide.
5. The high salinity wastewater treatment process according to claim 1, wherein: in S2.1, active carbon and defluorinated resin particles are filled in the medicine tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310737568.0A CN116514348A (en) | 2023-06-21 | 2023-06-21 | High salinity wastewater treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310737568.0A CN116514348A (en) | 2023-06-21 | 2023-06-21 | High salinity wastewater treatment process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116514348A true CN116514348A (en) | 2023-08-01 |
Family
ID=87397888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310737568.0A Pending CN116514348A (en) | 2023-06-21 | 2023-06-21 | High salinity wastewater treatment process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116514348A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140069821A1 (en) * | 2012-05-23 | 2014-03-13 | High Sierra Energy, LP | System and method for treatment of produced waters |
| CN105502782A (en) * | 2015-12-07 | 2016-04-20 | 湖南湘牛环保实业有限公司 | Technology for recovering water resources and salt from coking wastewater in coal chemical industry |
| WO2017181696A1 (en) * | 2016-04-21 | 2017-10-26 | 广州市心德实业有限公司 | Method for treating and recycling brine wastewater containing sodium chloride and sodium sulfate |
| CN206799345U (en) * | 2017-03-30 | 2017-12-26 | 杭州水处理技术研究开发中心有限公司 | A kind of system of high-salt wastewater purified salt |
| US20180148350A1 (en) * | 2016-11-29 | 2018-05-31 | China Petroleum & Chemical Corporation | Method and System for Treating Brine Waste Water |
| CN108275817A (en) * | 2018-01-22 | 2018-07-13 | 浙江开创环保科技股份有限公司 | A kind of processing method of the high salinity waste water reclaiming of high rigidity |
-
2023
- 2023-06-21 CN CN202310737568.0A patent/CN116514348A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140069821A1 (en) * | 2012-05-23 | 2014-03-13 | High Sierra Energy, LP | System and method for treatment of produced waters |
| CN105502782A (en) * | 2015-12-07 | 2016-04-20 | 湖南湘牛环保实业有限公司 | Technology for recovering water resources and salt from coking wastewater in coal chemical industry |
| WO2017181696A1 (en) * | 2016-04-21 | 2017-10-26 | 广州市心德实业有限公司 | Method for treating and recycling brine wastewater containing sodium chloride and sodium sulfate |
| CN107304090A (en) * | 2016-04-21 | 2017-10-31 | 广州市心德实业有限公司 | A kind of Resourceful treatment method for high-salinity wastewater of sodium chloride-containing and sodium sulphate |
| US20180148350A1 (en) * | 2016-11-29 | 2018-05-31 | China Petroleum & Chemical Corporation | Method and System for Treating Brine Waste Water |
| CN206799345U (en) * | 2017-03-30 | 2017-12-26 | 杭州水处理技术研究开发中心有限公司 | A kind of system of high-salt wastewater purified salt |
| CN108275817A (en) * | 2018-01-22 | 2018-07-13 | 浙江开创环保科技股份有限公司 | A kind of processing method of the high salinity waste water reclaiming of high rigidity |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108249646B (en) | Power plant desulfurization wastewater zero-emission treatment process and device capable of recycling resources | |
| CN102351352B (en) | Electrodialysis-efficient evaporation method for treating mining and metallurgy waste water membrane filtrating concentrate | |
| CN102260006B (en) | Method for treating heavy-metal-containing wastewater membrane filtration concentrated liquid | |
| US7514001B2 (en) | High recovery reverse osmosis process and apparatus | |
| CN107235601B (en) | Comprehensive electroplating wastewater treatment method, treatment system and application | |
| CN108689522B (en) | Method for treating and recycling mixed acid wastewater in photovoltaic industry | |
| CN102942279A (en) | Treatment method for circulating water sewerage and reverse osmosis concentrated water and equipment thereof | |
| CN113562924A (en) | Treatment system and method for resource utilization of high-salinity wastewater in ferrous metallurgy | |
| CN106946396A (en) | A kind of integrated treatment technology of wastewater of chemical industry with high concentration recycling | |
| CN113121058A (en) | Process method for removing nitrate nitrogen in high-salinity wastewater | |
| CN104909494A (en) | Process for impurity removal and purification of industrial high-concentration brine and special equipment of process | |
| CN111675394A (en) | High-salt industrial wastewater resource recovery treatment system and method | |
| CN110627290A (en) | High salt waste water resourceful treatment system | |
| CN107226581B (en) | Zinc-containing wastewater treatment method, treatment system and application | |
| CN107200435B (en) | Nickel-containing wastewater treatment method, treatment system and application | |
| CN112499863A (en) | Method for resource comprehensive utilization of high-concentration wastewater and waste salt | |
| CN103951017A (en) | Method for treating cyanogen-containing copper-containing electroplating wastewater by electrolysis and recycling copper | |
| CN108328836B (en) | Water inlet control system based on high-salt-content wastewater reduction process | |
| CN111115661B (en) | Nitric acid wastewater treatment system and method | |
| CN111960601A (en) | System and method for synchronously treating copper-containing wastewater and organic wastewater | |
| CN201785261U (en) | Treatment and recovery device for aluminum oxidation rinsing wastewater | |
| CN116514348A (en) | High salinity wastewater treatment process | |
| CN216129452U (en) | High salt-containing deacidification wastewater resource utilization system | |
| CN212610096U (en) | System for synchronous processing copper-containing waste water and organic waste water | |
| CN210122533U (en) | Processing system who contains salt waste water |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |