CN105906129A - Method for reutilization of water resources and transformation and utilization of salt in waste water - Google Patents

Method for reutilization of water resources and transformation and utilization of salt in waste water Download PDF

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Publication number
CN105906129A
CN105906129A CN201610408152.4A CN201610408152A CN105906129A CN 105906129 A CN105906129 A CN 105906129A CN 201610408152 A CN201610408152 A CN 201610408152A CN 105906129 A CN105906129 A CN 105906129A
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CN
China
Prior art keywords
waste water
salt
water
sodium chloride
separated
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
Application number
CN201610408152.4A
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Chinese (zh)
Inventor
杨本华
李�杰
白德泽
王玉坤
孟祥虎
秦正超
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Luxi Chemical Group Co Ltd
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Luxi Chemical Group Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Luxi Chemical Group Co Ltd filed Critical Luxi Chemical Group Co Ltd
Priority to CN201610408152.4A priority Critical patent/CN105906129A/en
Publication of CN105906129A publication Critical patent/CN105906129A/en
Pending legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • C02F1/04Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/22Treatment of water, waste water, or sewage by freezing
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/442Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/66Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/02Softening water by precipitation of the hardness

Abstract

The invention discloses a method for reutilization of water resources and transformation and utilization of salt in waste water. The method includes the following steps that the pH value of the waste water is adjusted to be alkaline for hardness removal, generated settling sludge is separated out of the water and then dried to serve as a boiler desulfurizing agent, and the obtained waste water is subjected to ultra-filtration and multiple levels of reverse osmosis concentration; the waste water obtained in the former step is subjected to nano-filtration, and univalence salt and high-valence salt are separated; the univalence salt is further separated and transformed, prepared purified sodium chloride strong brine is concentrated, and the sodium chloride strong brine serves as a chloro-alkali raw material; potassium chloride is added into mixed brine which is separated out through nano-filtration and contains high-valence ions and univalence ions for a replacement reaction to generate potassium sulphate and sodium chloride, potassium sulphate and sodium chloride are separated through freezing crystallization and high-temperature evaporative crystallization, generated potassium sulphate serves as a raw material for producing chemical fertilizer, separated sodium chloride serves as a chloro-alkali production raw material, and the water and the salt in the waste water can be completely recycled.

Description

Water resource reuse and the method for salinity trans-utilization in waste water
Technical field
The present invention relates to waste water reclaiming and reclaim water resource reuse and the method for salinity trans-utilization in field, especially waste water.
Background technology
At present, domestic a lot of business processes waste water mainly use Treated sewage reusing or evaporative crystallization to go out carnallite, after Waste water concentrating, Water Sproading, will arrange outside strong brine, or processes so that danger is useless with mud, brine sludge, the form of carnallite, solid while water " zero-emission " Garbage causes secondary soil pollution or water pollution.
Although the method relating to waste water reclaiming in prior art, it is typically all at for a certain particular problem in waste water Reason, all without reference to the whole resource of salinity by the water in waste water with different prices, and needs additional flocculating agents etc..Such as CN201210501778.1, discloses a kind of Resource utilization method of acid wastewater, comprises the steps: a, regulation pH value acid Property waste water is to 4.5~7;B, addition flocculant, remove precipitation after sedimentation;C, by step b process after waste water fibrous nodules mistake Filter and accurate filter filter, and make suspension content be less than 1mg/l;D, carrying out electrodialysis, controlling salinity is 10 ± 2%;e、 Multiple-effect Membrane Materials, controlling salinity is 30 ± 2%;It is 60~80% that f, multiple-effect evaporation control salinity, and then crystallization obtains product. CN201310196948.4, the method for the present invention includes: carry out heavy metal wastewater thereby successively reacting, coagulation, after flocculation input heavy Pond, shallow lake carries out solid-liquid separation, prepares middle water, middle water carries out multicomponent membrane advanced treating, thus prepare recycle-water, wherein: Partial sludge after solid-liquid separation is back to reaction member, and controlling reflux ratio is 20~35%, utilizes the Calx of parcel in mud As reactant, and the flocculation of the flco of utilization composition mud, reduce reactant and the dosage of coagulant, and then subtract Remaining coagulant in water in the middle of few, described reflux ratio be the returned sludge flowing into reaction member with inflow reaction member wait locate The volume ratio of reason water.
Summary of the invention
The purpose of the present invention is contemplated to solve the problems referred to above, it is provided that water resource reuse and the side of salinity trans-utilization in a kind of waste water Method, it is possible to by whole to the water in waste water and salt resources, without additional flocculating agents.
To achieve these goals, the present invention adopts the following technical scheme that
Water resource reuse and the method for salinity trans-utilization in a kind of waste water, step is as follows:
(1) pH value of waste water regulation to alkalescence is carried out except hard, through pulverizing system after the precipitating sludge of generation is separated from the water mummification Become the granule of 2-6mm as desulphurizer of boiler;
(2) waste water step (1) obtained passes through ultrafiltration and multi-stage reverse osmosis concentration;
(3) monovalent salt and high price salt are separated by waste water step (2) obtained by nanofiltration;
(4) monovalent salt nanofiltration separation in step (3) gone out is by separating conversion further, concentrates (preferably: make electricity consumption drive Film or high pressure reverse osmosis concentration) prepared pure sodium chloride strong brine, sodium chloride brine uses as chlor-alkali raw material;
(5) mixed salt containing high valence ion and monovalent ion nanofiltration separation in step (3) gone out adds potassium chloride to enter Row metathesis reaction generates potassium sulfate and sodium chloride, is crystallized by freezing and crystallizing and high temperature evaporation and potassium sulfate and sodium chloride is carried out point From, the potassium sulfate of output is as the raw material of production chemical fertilizer, and isolated sodium chloride uses as chlor-alkali production raw material.
Preferably: described step (1) uses Caustic soda regulation pH, regulates pH to more than 10.
Preferably: described step is passed through carbon dioxide in (1).
Preferably: the precipitating sludge of generation is separated from the water by described step (1) by clarification, filtration.
Described waste water is the waste water that high price salt is mainly sodium sulfate.
Beneficial effects of the present invention:
The method of the present invention, the sodium chloride brine gone out through nanofiltration separation directly send chlor-alkali corporatization after further isolated and purified concentration Salt uses as raw material, while sodium chloride resource in waste water, saves the energy consumption of sodium chloride evaporation.Obtain through nanofiltration separation The mixed salt containing high valence ion and monovalent ion send into high price salt reforming unit, adding potassium chloride, to carry out metathesis reaction raw Become potassium sulfate and sodium chloride, by low-temperature evaporation crystallization and high temperature evaporation crystallization, potassium sulfate and sodium chloride are separated.Output Potassium sulfate is as the raw material of production chemical fertilizer, and isolated sodium chloride send chlor-alkali company to use as raw material.This system can realize waste water The resource recycling of middle material utilizes and zero discharge treatment, uses the method for the present invention to process waste water, remove system evaporation loss and The moisture that material is taken away about 2%, residue water all reclaims, and reusing rate reaches more than 98%, inorganic salt reclamation rate more than 80%, Protection environment, saving waste water processing cost.
Accompanying drawing explanation
Fig. 1 is the process chart that waste water of the present invention processes.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
Such as Fig. 1, (1) is except the hard silicon facility that removes: waste water is removing firmly except silicon unit is by adding Caustic soda regulation pH to more than 10, sharp With carbonate original in water and heavy carbonic root, the hardness ionses such as the calcium and magnesium silicon in waste water are removed, when carbonate original in waste water and During heavy carbonic root deficiency, in waste water, it is passed through carbon dioxide the hardness ions in waste water is thoroughly removed, the calcium carbonate of generation, hydrogen Magnesium oxide, silicate etc. by clarification, filter be separated from the water, isolated mud pulverize after mummification make 2-6mm Grain is as desulphurizer of boiler.
(2) membrance concentration facility: through except firmly except the waste water after silicon, by ultra-filtration filters, then concentrate through multi-stage reverse osmosis, will be useless Water in water reclaims.
(3) nanofiltration: the waste water after reverse osmosis concentration uses nanofiltration to be separated with high price salt by monovalent salt.
(4) monovalent salt resource: the monovalent salt that nanofiltration separation goes out, by concentrating further, makes electricity consumption drive film or high pressure is reverse osmosis concentrated The pure sodium chloride strong brine that contraction obtains, sodium chloride brine uses as chlor-alkali raw material.
(5) salt resource at high price: nanofiltration dense water side obtains the mixed salt containing high valence ion and monovalent ion, and mixed salt send Enter high price salt reforming unit, add potassium chloride and carry out metathesis reaction generation potassium sulfate and sodium chloride, by freezing and crystallizing and high temperature Potassium sulfate and sodium chloride are separated by evaporative crystallization.The potassium sulfate of output is as the raw material of production chemical fertilizer, isolated sodium chloride Use as chlor-alkali production raw material.
Although the detailed description of the invention of the present invention is described by the above-mentioned accompanying drawing that combines, but not limit to scope System, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art need not pay Go out various amendments or deformation that creative work can make still within protection scope of the present invention.

Claims (8)

1. water resource reuse and a method for salinity trans-utilization in waste water, is characterized in that: step is as follows:
(1) carry out pH value of waste water regulation to alkalescence, except hard, pulverizing after the precipitating sludge of generation is separated from the water mummification and making The granule of 2-6mm is as desulphurizer of boiler;
(2) waste water step (1) obtained passes through ultrafiltration and multi-stage reverse osmosis concentration;
(3) monovalent salt and high price salt are separated by waste water step (2) obtained by nanofiltration;
(4) monovalent salt nanofiltration separation in step (3) gone out is by separating conversion further, concentrates the pure chlorination prepared Sodium strong brine, sodium chloride brine uses as chlor-alkali raw material;
(5) mixed salt containing high valence ion and monovalent ion nanofiltration separation in step (3) gone out adds potassium chloride to enter Row metathesis reaction generates potassium sulfate and sodium chloride, is crystallized by freezing and crystallizing and high temperature evaporation and potassium sulfate and sodium chloride is carried out point From, the potassium sulfate of output is as the raw material of production chemical fertilizer, and isolated sodium chloride is as chlor-alkali production raw material.
2. the method for claim 1, is characterized in that: use Caustic soda regulation pH in described step (1).
3. the method for claim 1, is characterized in that: regulation pH to more than 10 in described step (1).
4. the method for claim 1, is characterized in that: described step is passed through carbon dioxide in (1).
5. the method for claim 1, is characterized in that: in described step (1) by produce precipitating sludge by clarification, Filtration is separated from the water.
6. the method for claim 1, is characterized in that: make electricity consumption drive film or high pressure reverse osmosis concentration in described step (4).
7. the method for claim 1, is characterized in that: use high pressure reverse osmosis concentration in described step (4).
8. the method for claim 1, is characterized in that: described waste water is the high price salt waste water based on sodium sulfate.
CN201610408152.4A 2016-06-12 2016-06-12 Method for reutilization of water resources and transformation and utilization of salt in waste water Pending CN105906129A (en)

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CN201610408152.4A CN105906129A (en) 2016-06-12 2016-06-12 Method for reutilization of water resources and transformation and utilization of salt in waste water

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Application Number Priority Date Filing Date Title
CN201610408152.4A CN105906129A (en) 2016-06-12 2016-06-12 Method for reutilization of water resources and transformation and utilization of salt in waste water

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107253776A (en) * 2017-07-10 2017-10-17 四川绿沃创新环保工程有限公司 Washery slag acid waste water technique of zero discharge in a kind of Titanium Dioxide Produced by Chloride Procedure production process
CN107720782A (en) * 2017-10-20 2018-02-23 侯新春 A kind of technique and system for use in carrying for dividing salt preparing potassium sulfate from high-salt wastewater
CN109368903A (en) * 2018-12-26 2019-02-22 兰州理工大学 A kind of method of integration technique of membrane processing Metallurgical Waste Water

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1253911A (en) * 1998-11-17 2000-05-24 宜兴市江南水工设备厂 Regeneration method of effluent brine and its device
AU2005100689A4 (en) * 2005-08-26 2005-09-29 Packaged Food Intl Pty Ltd Process for desalination of seawater with zero effluent and zero greenhouse gas emission
CN103910457A (en) * 2014-04-15 2014-07-09 郭强 Device and method for treating and recycling salt-containing wastewater in industrial estates
CN105645439A (en) * 2016-01-30 2016-06-08 内蒙古久科康瑞环保科技有限公司 System for preparing potassium sulfate from high-salt-content industrial wastewater and technology of system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1253911A (en) * 1998-11-17 2000-05-24 宜兴市江南水工设备厂 Regeneration method of effluent brine and its device
AU2005100689A4 (en) * 2005-08-26 2005-09-29 Packaged Food Intl Pty Ltd Process for desalination of seawater with zero effluent and zero greenhouse gas emission
CN103910457A (en) * 2014-04-15 2014-07-09 郭强 Device and method for treating and recycling salt-containing wastewater in industrial estates
CN105645439A (en) * 2016-01-30 2016-06-08 内蒙古久科康瑞环保科技有限公司 System for preparing potassium sulfate from high-salt-content industrial wastewater and technology of system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107253776A (en) * 2017-07-10 2017-10-17 四川绿沃创新环保工程有限公司 Washery slag acid waste water technique of zero discharge in a kind of Titanium Dioxide Produced by Chloride Procedure production process
CN107720782A (en) * 2017-10-20 2018-02-23 侯新春 A kind of technique and system for use in carrying for dividing salt preparing potassium sulfate from high-salt wastewater
CN109368903A (en) * 2018-12-26 2019-02-22 兰州理工大学 A kind of method of integration technique of membrane processing Metallurgical Waste Water

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