CN206799345U - A kind of system of high-salt wastewater purified salt - Google Patents

A kind of system of high-salt wastewater purified salt Download PDF

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Publication number
CN206799345U
CN206799345U CN201720323353.4U CN201720323353U CN206799345U CN 206799345 U CN206799345 U CN 206799345U CN 201720323353 U CN201720323353 U CN 201720323353U CN 206799345 U CN206799345 U CN 206799345U
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salt
nanofiltration
reverse osmosis
water
divides
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褚红
杜圣羽
张来红
陈栋
张邢伟
俞游
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Hangzhou Water Treatment Technology Development Center Co Ltd
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Hangzhou Water Treatment Technology Development Center Co Ltd
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Abstract

The utility model belongs to technical field of industrial sewage treatment in weaving Thermal Power Generation Industry, more particularly, to a kind of system of high-salt wastewater purified salt.System provided by the utility model is by denitration nanofiltration separation and is concentrated into concentration of the sodium sulphate more than 16%, it is then sent to Freeze crystallization, the saltcake that purity is more than 95% is obtained, its yield reaches more than 80%, can reach more than 95% for the relatively low Water Sproading rate of COD contents;Pass through the purification of multistage nanofiltration, further retain sodium sulphate so that the purity of sodium chloride can reach more than more than 95%, and the impurity such as nitrate anion are removed by evaporative crystallization, the reuse value of refined sodium chloride can be further lifted, the overall recovery of sodium chloride can be accomplished to be more than more than 80%.

Description

A kind of system of high-salt wastewater purified salt
Technical field
The utility model belongs to technical field of industrial sewage treatment in weaving Thermal Power Generation Industry, is given up more particularly, to a kind of high salt The system of crystal's salt manufacturing.
Background technology
With industrial expansion, water resource it is in short supply, weaving, the pollution of thermoelectricity and chemical industry are on the rise, logical at present Cross after being recycled to 75% embrane method of raw water, the concentrated water left is post-processed into current knotty problem, even if by COD etc. Index, which is costly handled, reaches qualified discharge requirement, but haline water discharge is still made to field irrigation and ecological environment of soil etc. Into having a strong impact on, so how the salt resource in high-salt wastewater extracts reuse as one of focus of current wastewater treatment.
High-salt wastewater in textile industry derives from the auxiliary agent of fixation, and saltcake or glauber salt and refined salt are wanted to reuse salt Ask comparison high, separate both main salt in waste water, concentration is refined to reuse requirement, and it could be enterprise to control low reuse cost Economic benefit is brought, the post processing for developing reverse osmosis concentrated water effectively solves the problems, such as that high-salt wastewater recycling reuse not only reduces carnallite Solid waste discharge amount, moreover it is possible to solve Xinjiang etc. remote districts auxiliary agent cost of transportation.
At present, the integrated processing high-salt wastewater of film realizes that the technology of emission reduction has also had some similar patents, due to dividing salt Purity is inadequate, and the integrated salinity of film is relatively low to cause total system energy consumption higher, and can not popularization and application.
The content of the invention
The purpose of this utility model is, for the deficiencies in the prior art, there is provided a kind of high-salt wastewater purified salt System.
Therefore, above-mentioned purpose of the present utility model is achieved through the following technical solutions:
A kind of system of high-salt wastewater purified salt, the system include:
- pretreatment system, the pretreatment system are used to pre-process high-salt wastewater, and by pretreated Waste water meets to enter the water quality requirement that one-level nanofiltration divides salt system;
The nanofiltration of-one-level divides salt system, and the one-level nanofiltration point salt system is used to divide at salt pretreatment system progress nanofiltration Reason, concentrated water enter the progress nanofiltration of high pressure nanofiltration point salt system and divide salt treatment, and production water is carried out at concentration into first-stage reverse osmosis system Reason;
The nanofiltration of-high pressure divides salt system, and the high pressure nanofiltration point salt system is used to enter the concentrated water of one-level nanofiltration point salt system Nanofiltration divides salt treatment to row again, and high pressure nanofiltration divides the concentrated water of salt system to enter freezing and crystallizing system progress freezing and crystallizing, and production water enters Enter first-stage reverse osmosis system and carry out concentration;
- first-stage reverse osmosis system, the first-stage reverse osmosis system are used to divide one-level nanofiltration salt system and high pressure nanofiltration point The production water that salt system respectively obtains carries out reverse osmosis concentration processing, and the concentrated water of first-stage reverse osmosis system divides salt system into two level nanofiltration System carries out nanofiltration and divides salt treatment;
The nanofiltration of-two level divides salt system, and the two level nanofiltration divides salt system to be used for the concentrated water progress to first-stage reverse osmosis system Nanofiltration divides salt treatment again, and two level nanofiltration divides the concentrated water of salt system to enter the diluting compartment of anion detachable film electrodialysis system, Produce water and enter two-stage reverse osmosis system progress reverse osmosis concentration processing;
- two-stage reverse osmosis system, the two-stage reverse osmosis system are used to divide two level nanofiltration the production water of salt system to carry out instead Osmosis concentration processing, the part concentrated water of two-stage reverse osmosis system enter the enriched chamber of anion detachable film electrodialysis system;
- anion detachable film electrodialysis system, it is passed through in the diluting compartment of the anion detachable film electrodialysis system Two level nanofiltration divides the concentrated water of salt system, and the part concentrated water of two-stage reverse osmosis system is passed through in enriched chamber;
- electrodialysis concentration systems, dilute side is passed through the remaining dense of two-stage reverse osmosis system in the electrodialysis concentration systems Water, concentrated water side are passed through the concentrated water of anion detachable film electrodialysis system, and the concentrated water that electrodialysis concentration systems obtain enters evaporation Crystal system;
- freezing and crystallizing system, the freezing and crystallizing system divide salt system for Freeze crystallization from high pressure nanofiltration Concentrated water simultaneously obtains saltcake;And
- evaporation and crystallization system, the evaporation and crystallization system are used for evaporative crystallization processing and obtained from electrodialysis concentration systems Concentrated water, and by evaporating isolated purer sodium chloride.
While using above-mentioned technical proposal, the utility model can also be used or combined using further below Technical scheme:
The system also includes bipolar membrane electrodialysis system, and it is anti-to be passed through one-level in the salt room of the bipolar membrane electrodialysis system The part concentrated water of osmosis system.
The pretreatment system includes:Dosing settling system, filtering oxidative system and softening dealkalize system, to remove color The impurity such as degree, hardness, basicity and silicon, meet the requirement of salt manufacturing.
The fresh water reuse of the anion detachable film electrodialysis system to the entrance of one-level nanofiltration point salt system is received Filter divides salt.
The fresh water reuse of the electrodialysis concentration systems to the entrance of two-stage reverse osmosis system carries out reverse osmosis concentration processing.
Most of mother liquor reuse of the freezing and crystallizing system carries out nanofiltration to the entrance of high pressure nanofiltration point salt system and divides salt.
System provided by the utility model is not only suitable for, in the northern area compared with water shortage, also being adapted for environmental emission requirement The southern area of strict control salinity discharge, especially the weaving garden such as the more flourishing Zhejiang of textile industry, Guangdong, Shandong, The water of recovery can meet the process water requirement of weaving Thermal Power Generation Industry, not only reclaimed water and also reclaimed the heat carried in waste water Can, reduce generating and steam cost.Saltcake obtained by point salt and sodium chloride salt is completely available makees textile auxiliary, has saved original Material cost, solves bottleneck problem existing for high-salt wastewater processing, Ye Wei industry parks or enterprise bring preferably society and Economic benefit.
System provided by the utility model is by denitration nanofiltration separation and is concentrated into concentration of the sodium sulphate more than 16%, so After deliver to Freeze crystallization, obtain purity be more than 95% saltcake, its yield reaches more than 80%, relatively low for COD contents Water Sproading rate can reach more than 95%;By the purification of multistage nanofiltration, sodium sulphate is further retained so that the purity of sodium chloride It can reach more than more than 95%, the impurity such as nitrate anion are removed by evaporative crystallization, can further lift returning for refined sodium chloride With value, the overall recovery of sodium chloride can be accomplished to be more than more than 80%.
System provided by the utility model make use of the advantage of each workshop section stage by stage, carry out most rational combination, whole Individual technique, which has lacked a certain workshop section, can all cause the reduction of reuse effect and the rise of energy consumption, but because system size differs, water Matter is different, for mini-system, to reduce investment outlay, can reduce energy consumption by the method to strong brine direct reuse, also reduce Evaporation and the cost of investment of freezing and crystallizing part, producer can need to carry out process combination simplification according to actual reuse, by efficient The Integrated Films process route of rate realizes the abundant reuse of waste water resource.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram of the system of high-salt wastewater purified salt provided by the utility model;
In figure:101- dosing settling systems;102- filters oxidative system;103- softens dealkalize system;201- low pressure nanofiltrations Concentration systems;202- high pressure nanofiltration concentration systems;203- two level nanofiltration systems;301- first-stage reverse osmosis systems;302- two levels are anti- Osmosis system;303- three-level counter-infiltration systems;401- anion detachable film electrodialysis systems;402- electrodialysis concentration systems; 403- bipolar membrane electrodialysis systems;501- freezing and crystallizing systems;502- evaporation and crystallization systems.
Embodiment
The utility model is described in further detail with specific embodiment referring to the drawings.
A kind of system of high-salt wastewater purified salt, nanofiltration concentration systems concentrate for sodium sulphate, and press the pressure-resistant difference of film, Divide low pressure nanofiltration concentration systems 201 and high pressure nanofiltration concentration systems 202, low pressure nanofiltration concentration systems 201 have from anion and can divided The light liquid internal circulating load come is circulated throughout from EDBM system 401, the water inlet of high pressure nanofiltration concentration systems 202 includes freezing and crystallizing The mother liquor reflux of system 501 and the concentrated water of low pressure nanofiltration concentration systems 201, when system is larger, the nanofiltration that mother liquor can be concentrated again Concentration systems are separately provided, and are more beneficial for the control of product quality to freezing and crystallizing system.The NF membrane of selection is used to sulphur The higher denitration film of sour sodium rejection.
The pretreatment system of the system of high-salt wastewater purified salt is dosing settling system 101, filtering oxidative system 102 and soft Change dealkalize system 103, its purpose is exactly to remove colourity, hardness, basicity, silicon and part organic impurities, meets saltcake and chlorine Change the requirement of sodium salt, and ensure the safe and stable operation of film combined system.Regeneration salt solution needed for pretreatment can utilize one-level anti- The part concentrated water of osmosis system 301 or two-stage reverse osmosis system 302, and required acid solution and alkali lye are from bipolar membrane electrodialysis system 403 produce.
Separation to multivalent salts is completed by nanofiltration system, by high pressure nanofiltration separation and is concentrated into sodium sulphate about 16% Concentration send freezing and crystallizing system 501, wherein being more beneficial for improving the yield of sodium chloride crystal product containing a certain amount of sodium chloride salt. Suggest that again supporting evaporation drying equipment obtains glauber salt for southern area, be advantageous to deposit.
303 be three-level counter-infiltration system, it will usually determines whether the system needs to add three-level according to the conductance of recycle-water Counter-infiltration system, as the production water and evaporation condensed water of two-stage reverse osmosis system 302 need to take off again by three-level counter-infiltration system 303 again Salt, to control recycle-water electric conductivity value to be less than 200 μ s/cm, comply fully with each process point of textile industry with water requirement, total Water circulation Rate can reach more than more than 95%.
For electrodialysis system, this technique second ion detachable film electrodialysis system 401 and electrodialysis concentration systems 402 Two kinds of concentration process, the fresh water that detachable film electrodialysis system 401 enters is that purifying again for the sulfur-bearing acid sodium-salt through purifying again is de- Nitre nanofiltration concentrated water, and the concentrated water of detachable film electrodialysis system 401 is a part of concentrated water of two-stage reverse osmosis system 302, when can When salinity in the fresh water of seperation film electrodialysis system 401 is taken off to low concentration, its fresh water is allowed to be back to low pressure nanofiltration concentration systems 201 water inlet;And the concentrated water side that its concentrated water enters electrodialysis concentration systems 402 further concentrates, electrodialysis concentration systems 402 Fresh water is remaining concentrated water to come from two-stage reverse osmosis system 302, when the fresh water of electrodialysis concentration systems 402 is taken off to 2 ~ 3%, The water inlet of two-stage reverse osmosis system 302 is returned, and the concentrated water of electrodialysis concentration systems 402 is concentrated into sodium chloride by constantly circulation Concentration is delivered to evaporation and crystallization system 502 or direct reuse when reaching 18 ~ 20%.Bipolar membrane electrodialysis system 403 is for producing Pre-process the alkali needed for dosing and the acid needed for regeneration.The salt solution that enters of bipolar membrane electrodialysis system 403 is only needed from one-level reverse osmosis Appropriate salt solution is separated in reverse osmosis concentrated water after the concentration of permeable system 301, the light salt brine of bipolar membrane electrodialysis system 403 is back to First-stage reverse osmosis system 301 is concentrated again.
The system of high-salt wastewater purified salt provided by the utility model passes through nanofiltration and the equal combined energy of counter-infiltration system Recovery process realizes the reclaiming system of low energy consumption.Using the self-priming backwash principle of haline water, block up, reduce clear to reduce the dirt of film Wash frequency.
, it is necessary to arrange in right amount during the Recycling Mother Solution of freezing and crystallizing system 501 to the impurity level of unmanageable COD and monovalent salt Put, to ensure the product quality of saltcake and sodium chloride salt, the member of 98% precision can be obtained by evaporating again for southern area saltcake Bright powder, product are more beneficial for depositing.What evaporation and crystallization system 502 was selected is MVR evaporations, multiple-effect evaporation group technology, except output Outside can be with the purified salt of reuse, still there is a small amount of carnallite to discharge.
Above-mentioned embodiment is used for illustrating the utility model, preferred embodiment only of the present utility model, and It is not that the utility model is limited, it is new to this practicality in spirit of the present utility model and scope of the claims Any modification, equivalent substitution and improvements that type is made etc., both fall within the scope of protection of the utility model.

Claims (6)

1. a kind of system of high-salt wastewater purified salt, it is characterised in that the system includes:
- pretreatment system, the pretreatment system is used to pre-process high-salt wastewater, and expires by pretreated waste water Foot enters the water quality requirement that one-level nanofiltration divides salt system;
The nanofiltration of-one-level divides salt system, and the one-level nanofiltration point salt system is used to divide salt treatment to pretreatment system progress nanofiltration, dense Water enters the progress nanofiltration of high pressure nanofiltration point salt system and divides salt treatment, and production water enters first-stage reverse osmosis system and carries out concentration;
The nanofiltration of-high pressure divides salt system, and the high pressure nanofiltration point salt system is used to divide one-level nanofiltration the concentrated water of salt system to carry out again Secondary nanofiltration divides salt treatment, and high pressure nanofiltration divides the concentrated water of salt system to enter freezing and crystallizing system progress freezing and crystallizing, and production water enters one Level counter-infiltration system carries out concentration;
- first-stage reverse osmosis system, the first-stage reverse osmosis system are used to divide salt system to one-level nanofiltration point salt system and high pressure nanofiltration The production water respectively obtained of uniting carries out reverse osmosis concentration processing, and the concentrated water of first-stage reverse osmosis system is entered into two level nanofiltration point salt system Row nanofiltration divides salt treatment;
The nanofiltration of-two level divides salt system, and the two level nanofiltration divides salt system to be used to carry out again the concentrated water of first-stage reverse osmosis system Nanofiltration divides salt treatment, and two level nanofiltration divides the concentrated water of salt system to enter the diluting compartment of anion detachable film electrodialysis system, produces water Reverse osmosis concentration processing is carried out into two-stage reverse osmosis system;
- two-stage reverse osmosis system, the two-stage reverse osmosis system are used to divide two level nanofiltration the production water of salt system to carry out counter-infiltration Concentration, the part concentrated water of two-stage reverse osmosis system enter the enriched chamber of anion detachable film electrodialysis system;
- anion detachable film electrodialysis system, two level is passed through in the diluting compartment of the anion detachable film electrodialysis system Nanofiltration divides the concentrated water of salt system, and the part concentrated water of two-stage reverse osmosis system is passed through in enriched chamber;
- electrodialysis concentration systems, dilute side is passed through the remaining concentrated water of two-stage reverse osmosis system in the electrodialysis concentration systems, dense Water side is passed through the concentrated water of anion detachable film electrodialysis system, and the concentrated water that electrodialysis concentration systems obtain enters evaporative crystallization system System;
- freezing and crystallizing system, the freezing and crystallizing system are used for the concentrated water that Freeze crystallization divides salt system from high pressure nanofiltration And obtain saltcake;And
- evaporation and crystallization system, the evaporation and crystallization system obtain dense for evaporative crystallization processing from electrodialysis concentration systems Water, and by evaporating isolated purer sodium chloride.
2. the system of high-salt wastewater purified salt according to claim 1, it is characterised in that the system also includes Bipolar Membrane Electrodialysis system, the part concentrated water of first-stage reverse osmosis system is passed through in the salt room of the bipolar membrane electrodialysis system.
3. the system of high-salt wastewater purified salt according to claim 1, it is characterised in that the pretreatment system includes: Dosing settling system, filtering oxidative system and softening dealkalize system, to remove colourity, hardness, basicity and silicon impurities, meet salt manufacturing Requirement.
4. the system of high-salt wastewater purified salt according to claim 1, it is characterised in that the anion detachable film electricity The fresh water reuse of electrodialysis system carries out nanofiltration to the entrance of one-level nanofiltration point salt system and divides salt.
5. the system of high-salt wastewater purified salt according to claim 1, it is characterised in that the electrodialysis concentration systems Fresh water reuse to the entrance of two-stage reverse osmosis system carries out reverse osmosis concentration processing.
6. the system of high-salt wastewater purified salt according to claim 1, it is characterised in that the freezing and crystallizing system it is big Partial mother liquid reuse carries out nanofiltration to the entrance of high pressure nanofiltration point salt system and divides salt.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN108423903A (en) * 2018-02-27 2018-08-21 四川美富特水务有限责任公司 Dyeing waste water zero-discharge treatment system
CN108529802A (en) * 2018-04-03 2018-09-14 山东玉鑫环保科技股份有限公司 Titanium white production discharges high slat-containing wastewater zero-emission technique
CN110272061A (en) * 2018-03-14 2019-09-24 国家能源投资集团有限责任公司 A kind of salt extraction process
CN110734178A (en) * 2018-07-18 2020-01-31 宝武炭材料科技有限公司 coking wastewater membrane concentration salt separation zero-discharge treatment system and method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN108423903A (en) * 2018-02-27 2018-08-21 四川美富特水务有限责任公司 Dyeing waste water zero-discharge treatment system
CN110272061A (en) * 2018-03-14 2019-09-24 国家能源投资集团有限责任公司 A kind of salt extraction process
CN108529802A (en) * 2018-04-03 2018-09-14 山东玉鑫环保科技股份有限公司 Titanium white production discharges high slat-containing wastewater zero-emission technique
CN108529802B (en) * 2018-04-03 2020-10-30 山东玉鑫环保科技股份有限公司 Zero-discharge process for discharging high-salt-content wastewater in titanium dioxide production
CN110734178A (en) * 2018-07-18 2020-01-31 宝武炭材料科技有限公司 coking wastewater membrane concentration salt separation zero-discharge treatment system and method

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