CN106186550A - Sewage recycling Zero emission device and method - Google Patents
Sewage recycling Zero emission device and method Download PDFInfo
- Publication number
- CN106186550A CN106186550A CN201610720100.0A CN201610720100A CN106186550A CN 106186550 A CN106186550 A CN 106186550A CN 201610720100 A CN201610720100 A CN 201610720100A CN 106186550 A CN106186550 A CN 106186550A
- Authority
- CN
- China
- Prior art keywords
- water
- carnallite
- sedimentation tank
- pond
- pipeline
- 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.)
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- 239000010865 sewage Substances 0.000 title claims abstract description 33
- 238000004064 recycling Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 121
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 66
- PALNZFJYSCMLBK-UHFFFAOYSA-K magnesium;potassium;trichloride;hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-].[Cl-].[K+] PALNZFJYSCMLBK-UHFFFAOYSA-K 0.000 claims abstract description 64
- 238000004062 sedimentation Methods 0.000 claims abstract description 48
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 46
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 44
- 238000001556 precipitation Methods 0.000 claims abstract description 43
- 239000012267 brine Substances 0.000 claims abstract description 37
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims abstract description 37
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 37
- 238000001728 nano-filtration Methods 0.000 claims abstract description 35
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 33
- 238000000926 separation method Methods 0.000 claims abstract description 30
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 29
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 29
- 239000010413 mother solution Substances 0.000 claims abstract description 27
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 20
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 18
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 17
- 230000003647 oxidation Effects 0.000 claims abstract description 16
- 239000011780 sodium chloride Substances 0.000 claims abstract description 16
- 235000010344 sodium nitrate Nutrition 0.000 claims abstract description 16
- 239000004317 sodium nitrate Substances 0.000 claims abstract description 15
- 239000012141 concentrate Substances 0.000 claims abstract description 14
- 238000005189 flocculation Methods 0.000 claims abstract description 13
- 230000016615 flocculation Effects 0.000 claims abstract description 13
- 239000000347 magnesium hydroxide Substances 0.000 claims abstract description 12
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims abstract description 12
- 235000011121 sodium hydroxide Nutrition 0.000 claims abstract description 12
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 10
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 10
- 239000006071 cream Substances 0.000 claims abstract description 10
- 239000013505 freshwater Substances 0.000 claims abstract description 10
- 239000004571 lime Substances 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 8
- 239000002910 solid waste Substances 0.000 claims abstract description 6
- 238000005374 membrane filtration Methods 0.000 claims abstract description 3
- 150000001768 cations Chemical class 0.000 claims description 40
- 239000002351 wastewater Substances 0.000 claims description 39
- 239000012452 mother liquor Substances 0.000 claims description 24
- 238000010992 reflux Methods 0.000 claims description 24
- 239000002244 precipitate Substances 0.000 claims description 22
- 208000028659 discharge Diseases 0.000 claims description 21
- 238000002425 crystallisation Methods 0.000 claims description 20
- 230000008025 crystallization Effects 0.000 claims description 20
- 239000002253 acid Substances 0.000 claims description 17
- 239000003054 catalyst Substances 0.000 claims description 16
- 239000012528 membrane Substances 0.000 claims description 16
- 230000001172 regenerating effect Effects 0.000 claims description 16
- 238000002955 isolation Methods 0.000 claims description 15
- 239000007800 oxidant agent Substances 0.000 claims description 14
- 230000001590 oxidative effect Effects 0.000 claims description 14
- 238000001704 evaporation Methods 0.000 claims description 12
- 230000008020 evaporation Effects 0.000 claims description 12
- 239000000047 product Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 238000006731 degradation reaction Methods 0.000 claims description 6
- 238000010790 dilution Methods 0.000 claims description 6
- 239000012895 dilution Substances 0.000 claims description 6
- 239000002957 persistent organic pollutant Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 229910019142 PO4 Inorganic materials 0.000 claims description 4
- 238000005276 aerator Methods 0.000 claims description 4
- 238000000909 electrodialysis Methods 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 239000010452 phosphate Substances 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 claims description 2
- 150000002500 ions Chemical class 0.000 claims description 2
- 231100000719 pollutant Toxicity 0.000 claims description 2
- 208000004434 Calcinosis Diseases 0.000 claims 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 1
- 238000005502 peroxidation Methods 0.000 claims 1
- 238000010025 steaming Methods 0.000 claims 1
- 239000011593 sulfur Substances 0.000 claims 1
- 229910052717 sulfur Inorganic materials 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000013049 sediment Substances 0.000 abstract description 3
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 abstract description 2
- 239000012153 distilled water Substances 0.000 abstract 1
- 238000005342 ion exchange Methods 0.000 abstract 1
- 239000006228 supernatant Substances 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 description 9
- 239000000126 substance Substances 0.000 description 8
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical group OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical group [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 238000000108 ultra-filtration Methods 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- GTTYPHLDORACJW-UHFFFAOYSA-N nitric acid;sodium Chemical compound [Na].O[N+]([O-])=O GTTYPHLDORACJW-UHFFFAOYSA-N 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 239000006200 vaporizer Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 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 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 description 1
- 230000003851 biochemical process Effects 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 230000032696 parturition Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- -1 sulfate radical Chemical class 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000003643 water by type Substances 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
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D9/00—Nitrates of sodium, potassium or alkali metals in general
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/14—Magnesium hydroxide
- C01F5/22—Magnesium hydroxide from magnesium compounds with alkali hydroxides or alkaline- earth oxides or hydroxides
-
- 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
- C02F1/048—Purification of waste water by 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
- C02F1/44—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
- C02F1/46—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
-
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- 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
-
- 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
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
Abstract
The present invention relates to sewage recycling zero-discharge technology field.Sewage recycling Zero emission device, include flocculation sediment carnallite successively, add soda and obtain precipitation of calcium carbonate, add Caustic soda and obtain magnesium hydroxide, membrane filtration, pH value regulates, ion exchange softening, advanced oxidation, biomembrane biochemistry, film filter, nanofiltration, nanofiltration trap water is added lime cream and is obtained calcium sulfate, supernatant is back to carnallite sedimentation tank, nanofiltration concentrates again through the concentration of brine concentration device through water through reverse osmosis A, brine concentration device fresh water through reverse osmosis B concentrating return-flow to brine concentration device, the dense water of brine concentration device enters crystallizing evaporator, sodium chloride and sodium nitrate is respectively obtained again through thermal release and cold separation, crystalline mother solution major part reflow treatment, fraction drying and other treatment；Reverse osmosis produced water and distilled water reuse.The present invention has reclaimed the calcium carbonate of commercialization, magnesium hydroxide, calcium sulfate, sodium chloride, sodium nitrate salt and high-quality recycle-water, and solid waste discharge is few, and operating cost is low.
Description
Technical field
The present invention relates to technical field of sewage, relate to obtaining sewage disposal recycled water, and by salt main in water
The liquid zero emission method of Crystallization Separation.
Background technology
Along with the aggravation of economical activities of mankind, water resource will become the bottleneck of economic development.Therefore increasing feelings
Need under condition regeneration effluent becomes the recycled water that can substitute former water；Need to realize liquid zero emission under certain situation.
Common recycled water technology is the sewage after conventional biochemical processes or the relatively low sewage of other Organic Pollutions enters
Row includes that flocculation sediment, ultrafiltration, reverse-osmosis treated, currently mainly problem are owing to before entering membranous system, organic pollution processes not
Deeply, organic pollutants is still within higher level, and reverse osmosis is cleaned frequently, and reverse osmosis concentrated water can not reach discharge mark
Accurate.
Liquid zero emission sewage water treatment method generally comprises sewage chemical and softens and flocculation sediment, ultrafiltration, reverse osmosis, dense water
The devices such as reverse osmosis, brine concentration and evaporative crystallization, wherein saline brine concentration device includes that electrodialysis, steam mechanical compression are steamed
Send out device, just permeate, Membrane Materials, high pressure reverse osmosis etc..Currently mainly problem is owing to before entering membranous system, organic pollution processes
Not deeply so that reverse osmosis membrane needs frequent Chemical cleaning, also due to organic pollution processes not deeply before entering membranous system,
In reverse osmosis concentrated water, content of organics is too high so that dense water evaporative crystallization runs difficulty, and evaporative crystallization obtains larger amount of carnallite
Carnallite mixture with organic pollution.This carnallite mixture major part is dissolved in water, deals with improperly and can again result in environment dirt
Dye；Therefore this Master Mix is further processed into the highest, even needs to process as dangerous waste product.
Chinese patent application (201510522599.X) emphasis solves Organic substance interference problem in sewage zero-discharge technique,
But do not reclaim difficulty soluble salt so that chemical sludge amount is too high；Sodium sulfate is obtained so that evaporative crystallization processes by evaporative crystallization
Amount increases, and the sodium sulfate crystal containing water of crystallization obtained is worth almost without reuse, adds processing cost.
In common sewage, dominant cation is sodium, calcium, magnesium, and Main Anions is chloride ion, sulfate radical, nitrate anion, carbonic acid
Hydrogen radical.A small amount of potassium, fluorine, phosphate radical plasma.The purpose of this sewage recycling Zero emission device and processing method seeks to handle
Cation main in water and anion all reclaim and resource, reduce solid waste total amount and operating cost simultaneously.
Summary of the invention
The invention solves the problems that recycled water technology reverse osmosis is cleaned frequently, reverse osmosis concentrated water can not reach the technology of discharge standard
Problem；In liquid zero emission sewage water treatment method, reverse osmosis membrane needs frequent Chemical cleaning, and dense water evaporative crystallization runs difficulty, steams
Send out crystallization acquisition is the mixture of larger amount of carnallite and organic pollution, and whole system is difficult for long-term stable operation, salt
Recovery ratio is low, and chemical sludge amount is big, the problem that operating cost is high.
Disclose a kind of sewage recycling zero discharge treatment device to reach the object above present invention, include a flocculation successively
Agent adding set, a flocculation aid adding set, a carnallite sedimentation tank, a soda adding set, a precipitation of calcium carbonate pond, a Caustic soda
Adding set, a magnesium hydrate precipitate pond, an acid adding set, a cation exchanger, an oxidant adding set, an oxidation
Catalyst, a biofilm reactor and an aerator, a film filter B, a nanofiltration membrane separation device, brine concentration device, evaporation knot
Brilliant device, heat separator, cold separator, mother solution drying device；Also include for by the most miscellaneous for regenerating cation exchanger return of waste water
The regenerating cation exchanger return of waste water pipeline of salt sedimentation tank, for by film filter B return of waste water to carnallite sedimentation tank
Film filter B return of waste water pipeline, for processing the calcium sulfate precipitation pond of nanofiltration separation device trap water, for by nanofiltration separation device
Trap water is back to the nanofiltration dense water concentrate recirculation pipeline in calcium sulfate precipitation pond, for adding stone in nanofiltration separation device trap water
The lime cream adding set of ash；Return for calcium sulfate precipitation pond product water being back to the calcium sulfate precipitation pond product water of carnallite sedimentation tank
Flow tube road, for by the reverse osmosis B concentrate recirculation pipeline of reverse osmosis isolation device B concentrate recirculation to brine concentration device, be used for portion
Point crystalline mother solution be back to vaporizer mother liquor reflux crystallizer pipeline, for by partially crystallizable mother liquor reflux to carnallite sedimentation tank
Mother liquor reflux carnallite sedimentation tank pipeline；Also include multiple precipitate pressure-filteration drying device, multiple film backwash and Chemical cleaning dress
Put, at least one regenerating cation exchanger device, multiple elevator pump and automaton.
A film filter A is also included and for by film between described magnesium hydrate precipitate pond and described cation exchanger
Filter A return of waste water is to the film filter A return of waste water pipeline of carnallite sedimentation tank.
A reverse osmosis isolation device A, this reverse osmosis is also included between described nanofiltration membrane separation device and described brine concentration device
The dense water of separator A enters brine concentration device, and its fresh water is recycle-water.
The dilution pipeline of an interpolation recycle-water is also included between described cation exchanger and oxidation catalyst.
Described brine concentration device is electrodialysis plant, steam mechanical recompression evaporator, multi-effect evaporator, single effect evaporator
In at least one.
Described crystallizing evaporator is steam mechanical recompression crystallizing evaporator, multiple-effect evaporation crystallizing evaporator, single-action crystallization
At least one in crystallizing evaporator.
The most in order to achieve the above object, the present invention discloses and a kind of uses described sewage recycling zero discharge treatment device
Sewage recycling Zero discharge treatment method, add flocculant and flocculation aid adding set including former water through flocculant adding apparatus
The a small amount of indissoluble carnallite comprising phosphate and organic pollution adding flocculation aid generation precipitates in carnallite sedimentation tank, this indissoluble
Carnallite forms solid waste；Carnallite sedimentation tank produces water and adds micro-excess soda (sodium carbonate) through soda adding set, generation
Calcium carbonate precipitates in precipitation of calcium carbonate pond, obtains calcium carbonate；Precipitation of calcium carbonate pond is produced water and is added Caustic soda through Caustic soda adding set
(sodium hydroxide), to pH=11-12, the magnesium hydroxide of generation precipitates in magnesium hydrate precipitate pond, obtains magnesium hydroxide；Hydrogen-oxygen
Change magnesium precipitate pond product water adds acid for adjusting pH value through acid adding set and softens to 5-8, entrance cation exchanger, and cation is handed over
Parallel operation regenerative wastewater is through regenerating cation exchanger return of waste water pipeline backflow carnallite sedimentation tank；Cation exchanger produces in water logical
Peroxide agent adding set adds oxidant, enters oxidation catalyst, improves giving birth to of organic pollutant by oxidation reaction
The property changed；Oxidation catalyst water outlet enters biofilm reactor, and the biochemical degradation reaction of organic pollution, biofilm reactor occur
Producing water to filter through film filter B, film filter B filters the waste water produced and flows to carnallite through film filter B return of waste water back of pipeline
Sedimentation tank；Film filter B produces water and enters nanofiltration separation device, and nanofiltration separation device trap water adds Calx through lime cream adding set
Breast, the calcium sulfate of generation precipitates in calcium sulfate precipitation pond, obtains calcium sulfate, and water is produced through calcium sulfate precipitation pond in calcium sulfate precipitation pond
Reflux line is back to carnallite sedimentation tank (1) nanofiltration separation device and enters brine concentration device through water；Brine concentration device fresh water is through anti-
Infiltration B processes and obtains recycle-water, and the dense water of reverse osmosis B flow to brine concentration device through reverse osmosis B concentrate recirculation back of pipeline and enters water；Saline
The dense water that concentrator produces enters crystallizing evaporator, and the steam that crystallizing evaporator produces obtains recycle-water through heat reclamation device, control
Evaporation and concentration degree processed make sodium nitrate in crystallizing evaporator in hot mother liquor close to saturated, by this hot mother liquor through heat separator separate
Obtain sodium chloride, the mother solution cooling that heat separator separates, causes sodium nitrate crystallization process, separates through cold separator, obtain nitric acid
Sodium；The mother solution major part separated through cold separator is back to crystallizing evaporator continuation evaporation knot through mother liquor reflux crystallizer pipeline
Crystalline substance, so circulates；When mother solution organic pollution and other impurity effect sodium chloride and sodium nitrate purity, partial mother liquid is through mother solution
Backflow carnallite sedimentation tank back of pipeline flows to carnallite sedimentation tank, eliminates wherein most by carnallite sedimentation tank and subsequent technique thereof dirty
Dye thing；In order to be further ensured that sodium chloride and sodium nitrate purity, fraction mother solution is dried through mother solution exsiccator, produces mother solution mummification
Product.
Between described magnesium hydrate precipitate pond and described acid adding set, also include that a film filter A, film filter A produce
Entering cation exchanger after water acid adding, film filter A waste water flows to carnallite precipitation through film filter A return of waste water back of pipeline
Pond.
A reverse osmosis isolation device A, reverse osmosis isolation device A is had between described nanofiltration membrane separation device and described brine concentration device
Fresh water is recycle-water, and the dense water of reverse osmosis isolation device A enters brine concentration device.
Repeat described interpolation oxidant and described biochemical degradation reacts at least one times.
Recycle-water is added, by salinity by dilution pipeline between described cation exchanger and described oxidation catalyst
Regulation is to less than 2%.
It is stable that beneficial effects of the present invention includes degrading majority of organic pollutants, membranous system and vaporizer, returns
Receive salt purity high；Calcium carbonate, magnesium hydroxide, calcium sulfate, sodium chloride, five kinds of salts of sodium nitrate are reclaimed, by common in former water
Leading ion all reclaim, solid waste substantially reduces；Obtain high-quality recycle-water；Sulfate radical is precipitated, reduces dense salt
Water evaporates, and reduces operating cost.
Accompanying drawing explanation
Fig. 1 sewage recycling treatment method schematic flow sheet.
Wherein: 1. carnallite sedimentation tank, 2. precipitation of calcium carbonate pond, 3. magnesium hydrate precipitate pond, 4. film filter A, 5. sun from
Sub-exchanger, 6. oxidation catalyst, 7. biofilm reactor, 8. film filter B, 9. nanofiltration membrane separation device, 10. calcium sulfate precipitation
Pond, 11. reverse osmosis membrane separator A, 12. brine concentration devices, 13. reverse osmosis concentration device B, 14. evaporated crystallization devices, 15. heat point
From device, 16. cold separators, 17. mother solution drying devices；
110. film filter A return of waste water pipelines, 120. regenerating cation exchanger return of waste water pipelines, 130. membrane filtrations
Device B return of waste water pipeline, 140. nanofiltration concentrate recirculation pipelines, water reflux line, 160. reverse osmosis B are produced in 150. calcium sulfate precipitation ponds
Concentrate recirculation pipeline, 170. mother liquor reflux crystallizer pipelines, 180. mother liquor reflux carnallite sedimentation tank pipelines；
210. flocculant adding apparatus, 220. flocculation aid adding sets, 230. soda adding sets, 240. Caustic sodas add dress
Put, 250. acid adding sets, 260. oxidant adding sets, 270. aerators, 280. lime cream adding sets；
300. former water, 310. recycled waters, 320. calcium carbonate, 330. magnesium hydroxide, 340. calcium sulfate, 350. sodium chloride,
360. sodium nitrate；
410. indissoluble carnallites, 420. mother solution mummification products.
Detailed description of the invention
As it is shown in figure 1, sewage recycling zero discharge treatment device, include a flocculant adding apparatus (210) successively, one help
Solidifying agent adding set (220), a carnallite sedimentation tank (1), a soda adding set (230), a precipitation of calcium carbonate pond (2), a fire
Alkali adding set (240), a magnesium hydrate precipitate pond (3), acid adding set (250), a cation exchanger (5), an oxygen
Agent adding set (260), oxidation catalyst (6), a biofilm reactor (7) and an aerator (270), a film filter
B (8), a nanofiltration membrane separation device (9), brine concentration device (12), evaporated crystallization device (14), heat separator (15), cold separator
(16), mother solution drying device (17)；Also include for cation exchanger (5) regenerative wastewater is back to carnallite sedimentation tank (1)
Regenerating cation exchanger return of waste water pipeline (120), for by film filter B (8) return of waste water to carnallite sedimentation tank (1)
Film filter B return of waste water pipeline (130), it is used for processing the calcium sulfate precipitation pond (10) of nanofiltration separation device (9) trap water, being used for
Nanofiltration separation device (9) trap water is back to the nanofiltration dense water concentrate recirculation pipeline (140) in calcium sulfate precipitation pond (10), for
Nanofiltration separation device (9) trap water is added the lime cream adding set (280) of Calx；For calcium sulfate precipitation pond (10) are produced water
Water reflux line (150) is produced, for by dense for reverse osmosis isolation device B (13) in the calcium sulfate precipitation pond being back to carnallite sedimentation tank (1)
Water is back to reverse osmosis B concentrate recirculation pipeline (160) of brine concentration device (12), is used for partially crystallizable mother liquor reflux to evaporation
Mother liquor reflux crystallizer pipeline (170) of device, for partially crystallizable mother liquor reflux is miscellaneous to the mother liquor reflux of carnallite sedimentation tank (1)
Salt sedimentation tank pipeline (180)；Also include multiple precipitate pressure-filteration drying device, multiple film backwash and chemically-cleaning device, at least
One regenerating cation exchanger device, multiple elevator pump and automaton.
In order to improve the regeneration period of cation exchanger, magnesium hydrate precipitate pond (3) and cation exchanger (5) it
Between also include that a film filter A (4) and is for by the film filter of film filter A (4) return of waste water to carnallite sedimentation tank (1)
A return of waste water pipeline (110).
Described film filter A (4) is in cross-current type intrinsic pressure tubular membrane filter, cross-current type intrinsic pressure capillary-pipe film filter
At least one.Described film filter B is the one in all kinds of ultrafiltration or microfiltration.
When former water salinity is less than 2%, between nanofiltration membrane separation device (9) and brine concentration device (12), there is a reverse osmosis
Separator A (11), this reverse osmosis isolation device A (11) dense water enters brine concentration device (12), and its fresh water is recycle-water (310).
When former water salinity is more than 2%, it is characterised in that between cation exchanger (5) and oxidation catalyst (6)
There is the dilution pipeline (190) of interpolation recycle-water (310), salinity regulation is beneficial to subsequent bio film reaction between 1-2%
The reaction efficiency of device (7).
Described oxidant is ozone, and oxidant adding set (260) is ozonator, ozone adds facility and ozone is urged
Change bed.
Described oxidant is hydrogen peroxide, and oxidant adding set (260) is that facility is added in hydrogen peroxide metering.
Described brine concentration device (12) is electrodialysis (ED) device, steam mechanical recompression evaporator, multi-effect evaporator, list
At least one in single-effect evaporator.
Described crystallizing evaporator is steam mechanical recompression crystallizing evaporator, multiple-effect evaporation crystallizing evaporator, single-action crystallization
At least one in crystallizing evaporator.
Described mother solution exsiccator is the one in spray dryer, evaporation pond.
Use the sewage recycling Zero discharge treatment method of described sewage recycling zero discharge treatment device, including former water
(300) comprising of flocculation aid generation is added through flocculant adding apparatus (210) interpolation flocculant and flocculation aid adding set (220)
A small amount of indissoluble carnallite (410) of phosphate and organic pollution is precipitation, this indissoluble carnallite (410) shape in carnallite sedimentation tank (1)
Become solid waste；Carnallite sedimentation tank (1) produces water and adds micro-excess soda (sodium carbonate) through soda adding set (230), generates
Calcium carbonate (320) precipitation in precipitation of calcium carbonate pond (2), obtain calcium carbonate (320)；Water is produced through fire in precipitation of calcium carbonate pond (2)
Alkali adding set (240) adds Caustic soda (sodium hydroxide) and sinks at magnesium hydroxide to pH=11-12, the magnesium hydroxide (330) of generation
In pond, shallow lake (3), precipitation, obtains magnesium hydroxide (330)；Magnesium hydrate precipitate pond (3) is produced water and is adjusted through acid adding set (250) acid adding
Joint pH value, to 5-8, enters cation exchanger (5) and softens, and cation exchanger (5) regenerative wastewater is through cation exchanger
Regenerative wastewater reflux line (120) backflow carnallite sedimentation tank (1)；Cation exchanger (5) produces in water and adds dress by oxidant
Put (260) and add oxidant, enter oxidation catalyst (6), improved the biodegradability of organic pollutant by oxidation reaction；Oxygen
Change catalyst (6) water outlet and enter biofilm reactor (7), the biochemical degradation reaction of organic pollution, biofilm reactor occur
(7) producing water to filter through film filter B, film filter B filters the waste water produced and returns through film filter B return of waste water pipeline (130)
Flow to carnallite sedimentation tank (1)；Film filter B produces water and enters nanofiltration separation device (9), and nanofiltration separation device (9) trap water is through lime cream
Adding set (280) adds lime cream, and the calcium sulfate (340) of generation is precipitation in calcium sulfate precipitation pond (10), obtains calcium sulfate
(340), calcium sulfate precipitation pond (10) are produced water and are back to carnallite sedimentation tank (1), nanofiltration through calcium sulfate precipitation pond reflux line (150)
Separator (9) enters brine concentration device (12) through water；Brine concentration device (12) fresh water processes through reverse osmosis B (13) and obtains reuse
Water (310), reverse osmosis B (13) dense water is back to brine concentration device (12) through reverse osmosis B concentrate recirculation pipeline (160) and enters water；Salt
The dense water that water concentrator (12) produces enters crystallizing evaporator (14), and the steam that crystallizing evaporator (14) produces is through heat reclamation device
Obtain recycle-water (310), control evaporation and concentration degree make sodium nitrate in crystallizing evaporator (12) in hot mother liquor close to saturated, general
This hot mother liquor, through heat separator (15) isolated sodium chloride (350), the mother solution cooling that heat separator (15) separates, causes nitric acid
Sodium crystallization process, separates through cold separator (16), obtains sodium nitrate (360)；Through the mother solution major part that cold separator (16) separates
It is back to crystallizing evaporator (14) through mother liquor reflux crystallizer pipeline (170) and continues evaporative crystallization, so circulate；When mother solution is organic
When pollutant and other impurity effect sodium chloride (350) and sodium nitrate (360) purity, partial mother liquid precipitates through mother liquor reflux carnallite
Pond pipeline (180) is back to carnallite sedimentation tank (1), eliminates wherein most by carnallite sedimentation tank (1) and subsequent technique thereof dirty
Dye thing；In order to be further ensured that sodium chloride (350) and sodium nitrate (360) purity, fraction mother solution is done through mother solution exsiccator (17)
Dry, produce mother solution mummification product (420).
In order to improve the regeneration period of cation exchanger, magnesium hydrate precipitate pond (3) and acid adding set (250) it
Between also include a film filter A (4), film filter A (4) to produce after water acid adding entering cation exchanger (5), film filter A (4)
Waste water is back to carnallite sedimentation tank (1) through film filter A return of waste water pipeline (110).
When former water salinity is less than 2%, between nanofiltration membrane separation device (9) and brine concentration device (12), there is a reverse osmosis
Separator A (11), reverse osmosis isolation device A (11) fresh water is recycle-water (310), and reverse osmosis isolation device A (11) dense water enters saline
Concentrator (12).
When in former water, persistent organic pollutants content is higher, repeat to add oxidant and biochemical degradation reaction at least
Secondary.
When former water salinity is more than 2%, by dilution pipeline between cation exchanger (5) and oxidation catalyst
(190) add recycle-water (310), salinity regulation to less than 2% is beneficial to the reaction effect of subsequent bio membrane reactor (7)
Rate.
Claims (11)
1. a sewage recycling zero discharge treatment device, it is characterised in that include successively a flocculant adding apparatus (210), one
Flocculation aid adding set (220), a carnallite sedimentation tank (1), a soda adding set (230), a precipitation of calcium carbonate pond (2), one
Caustic soda adding set (240), a magnesium hydrate precipitate pond (3), one acid adding set (250), a cation exchanger (5), one
Oxidant adding set (260), oxidation catalyst (6), a biofilm reactor (7) and an aerator (270), a membrane filtration
Device B (8), a nanofiltration membrane separation device (9), brine concentration device (12), evaporated crystallization device (14), heat separator (15), cold separation
Device (16), mother solution drying device (17)；Also include for cation exchanger (5) regenerative wastewater is back to carnallite sedimentation tank (1)
Regenerating cation exchanger return of waste water pipeline (120), for by film filter B (8) return of waste water to carnallite sedimentation tank (1)
Film filter B return of waste water pipeline (130), be used for processing the calcium sulfate precipitation pond (10) of nanofiltration separation device (9) trap water, use
In nanofiltration separation device (9) trap water being back to the nanofiltration dense water concentrate recirculation pipeline (140) in calcium sulfate precipitation pond (10), it is used for
The lime cream adding set (280) of Calx is added in nanofiltration separation device (9) trap water；For calcium sulfate precipitation pond (10) are produced
Water is back to the calcium sulfate precipitation pond of carnallite sedimentation tank (1) and produces water reflux line (150), for by reverse osmosis isolation device B (13)
Concentrate recirculation to brine concentration device (12) reverse osmosis B concentrate recirculation pipeline (160), for by partially crystallizable mother liquor reflux to steaming
Send out mother liquor reflux crystallizer pipeline (170) of device, for by the mother liquor reflux of partially crystallizable mother liquor reflux to carnallite sedimentation tank (1)
Carnallite sedimentation tank pipeline (180)；Also include multiple precipitate pressure-filteration drying device, multiple film backwash and chemically-cleaning device, extremely
A few regenerating cation exchanger device, multiple elevator pump and automaton.
Sewage recycling zero discharge treatment device the most according to claim 1, it is characterised in that in magnesium hydrate precipitate pond
(3) and also include between cation exchanger (5) that a film filter A (4) and is for arriving film filter A (4) return of waste water
Film filter A return of waste water pipeline (110) of carnallite sedimentation tank (1).
Sewage recycling zero discharge treatment device the most according to claim 1, it is characterised in that in nanofiltration membrane separation device (9)
And having reverse osmosis isolation device A (11) between brine concentration device (12), this reverse osmosis isolation device A (11) dense water enters brine concentration
Device (12), its fresh water is recycle-water (310).
Sewage recycling zero discharge treatment device the most according to claim 1, it is characterised in that exchange in described cation
The dilution pipeline (190) of an interpolation recycle-water (310) is also included between device (5) and described oxidation catalyst (6).
Sewage recycling zero discharge treatment device the most according to claim 1, it is characterised in that described brine concentration device
(12) it is at least one in electrodialysis (ED) device, steam mechanical recompression evaporator, multi-effect evaporator, single effect evaporator.
Sewage recycling zero discharge treatment device the most according to claim 1, it is characterised in that described crystallizing evaporator is
At least one in steam mechanical recompression crystallizing evaporator, multiple-effect evaporation crystallizing evaporator, single-action crystallization and evaporation crystallizer.
7. a sewage recycling Zero discharge treatment method, it is characterised in that use the sewage money described in claim 1,4,5 or 6
Source zero discharge treatment device, adds flocculant and flocculation aid interpolation dress including former water (300) through flocculant adding apparatus (210)
Put (220) and add a small amount of indissoluble carnallite (410) comprising phosphate and organic pollution of flocculation aid generation at carnallite sedimentation tank
(1) precipitation in, this indissoluble carnallite (410) forms solid waste；Carnallite sedimentation tank (1) produces water through soda adding set (230)
Adding micro-excess soda (sodium carbonate), the calcium carbonate (320) of generation is precipitation in precipitation of calcium carbonate pond (2), obtains calcium carbonate
(320)；Precipitation of calcium carbonate pond (2) is produced water and is added Caustic soda (sodium hydroxide) to pH=11-12, life through Caustic soda adding set (240)
The magnesium hydroxide (330) become is precipitation in magnesium hydrate precipitate pond (3), obtains magnesium hydroxide (330)；Magnesium hydrate precipitate pond
(3) produce water and add acid for adjusting pH value to 5-8 through acid adding set (250), enter cation exchanger (5) and soften, cation
Exchanger (5) regenerative wastewater is through regenerating cation exchanger return of waste water pipeline (120) backflow carnallite sedimentation tank (1)；Cation
Exchanger (5) produces in water and adds oxidant by oxidant adding set (260), enters oxidation catalyst (6), logical peroxidation
The biodegradability of organic pollutant should be improved；Oxidation catalyst (6) water outlet enters biofilm reactor (7), and organic dirt occurs
The biochemical degradation reaction of dye thing, biofilm reactor (7) produces water and filters through film filter B, and film filter B filters the waste water produced
It is back to carnallite sedimentation tank (1) through film filter B return of waste water pipeline (130)；Film filter B produces water and enters nanofiltration separation device
(9), nanofiltration separation device (9) trap water adds lime cream through lime cream adding set (280), and the calcium sulfate (340) of generation is at sulfur
Precipitation in acid calcium deposit pond (10), obtains calcium sulfate (340), and calcium sulfate precipitation pond (10) produce water through calcium sulfate precipitation pond return duct
Road (150) is back to carnallite sedimentation tank (1), and nanofiltration separation device (9) enters brine concentration device (12) through water；Brine concentration device
(12) fresh water processes through reverse osmosis B (13) and obtains recycle-water (310), and reverse osmosis B (13) dense water is through reverse osmosis B concentrate recirculation pipeline
(160) it is back to brine concentration device (12) and enters water；The dense water that brine concentration device (12) produces enters crystallizing evaporator (14), evaporation
The steam that crystallizer (14) produces obtains recycle-water (310) through heat reclamation device, controls evaporation and concentration degree and sodium nitrate is being steamed
Send out in crystallizer (12) interior hot mother liquor close to saturated, by this hot mother liquor through heat separator (15) isolated sodium chloride (350), heat
The mother solution cooling that separator (15) separates, causes sodium nitrate crystallization process, separates through cold separator (16), obtain sodium nitrate
(360)；The mother solution major part separated through cold separator (16) is back to crystallizing evaporator through mother liquor reflux crystallizer pipeline (170)
(14) continue evaporative crystallization, so circulate；When mother solution organic pollution and other impurity effect sodium chloride (350) and sodium nitrates
(360), during purity, partial mother liquid is back to carnallite sedimentation tank (1) through mother liquor reflux carnallite sedimentation tank pipeline (180), passes through carnallite
Sedimentation tank (1) and subsequent technique thereof eliminate wherein most pollutant；In order to be further ensured that sodium chloride (350) and sodium nitrate
(360) purity, fraction mother solution is dried through mother solution exsiccator (17), produces mother solution mummification product (420).
Sewage recycling Zero discharge treatment method the most according to claim 7, it is characterised in that sink at described magnesium hydroxide
Also include that a film filter A (4), film filter A (4) produce water acid adding between pond, shallow lake (3) and described acid adding set (250) laggard
Entering cation exchanger (5), film filter A (4) waste water is back to carnallite precipitation through film filter A return of waste water pipeline (110)
Pond (1).
Sewage recycling Zero discharge treatment method the most according to claim 7, it is characterised in that at described nanofiltration membrane separation
Reverse osmosis isolation device A (11), reverse osmosis isolation device A (11) fresh water is had to be back between device (9) and described brine concentration device (12)
With water (310), reverse osmosis isolation device A (11) dense water enters brine concentration device (12).
10. according to the sewage recycling Zero discharge treatment method described in claim 7,8 or 9, it is characterised in that repeat to add oxygen
Agent and biochemical degradation react at least one times.
11. according to the sewage recycling Zero discharge treatment method described in claim 7,8,9 or 10, it is characterised in that at described sun
Add recycle-water (310) by dilution pipeline (190) between ion exchanger (5) and described oxidation catalyst, salinity is adjusted
Joint is to less than 2%.
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