CN109809592A - A kind of coking wastewater nanofiltration concentrate divides salt method of resource - Google Patents
A kind of coking wastewater nanofiltration concentrate divides salt method of resource Download PDFInfo
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- CN109809592A CN109809592A CN201910164968.0A CN201910164968A CN109809592A CN 109809592 A CN109809592 A CN 109809592A CN 201910164968 A CN201910164968 A CN 201910164968A CN 109809592 A CN109809592 A CN 109809592A
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Abstract
Divide salt method of resource the invention discloses a kind of coking wastewater nanofiltration concentrate, the nanofiltration concentrate of coking wastewater enters the adjusting that conditioning tank carries out homogeneous average, water outlet enters the removal that highly dense sedimentation basin realizes hardness in coking wastewater nanofiltration concentrate by promoting water pump, water outlet is removed by the major part of more medium filter realization remaining suspension object, and water outlet enters promotion pond and enters ultrafiltration membrance filter system by promotion water pump and booster water pump；Ultrafiltration membrane produces water and enters ultrafiltration membrane production pond, then enters RO membranous system by RO film raw water pump and high-pressure pump and is concentrated, and after organic matter of the RO concentrated water by the removal concentration of electrocatalytic oxidation system, water outlet divides salt system into high pressure nanofiltration；SO containing higher concentration4 2‑High pressure nanofiltration concentrate pass through the output that MVR evaporative crystallization and freezing and crystallizing unit realize sodium sulfate crystal salt respectively；Cl containing higher concentration‑High pressure nanofiltration produce water then pass through sodium chloride crystallizer realize sodium chloride crystal salt output.
Description
Technical field
The present invention relates to Technologies of Coke Plant Wastewater Treatment field, specifically a kind of coking wastewater nanofiltration concentrate divides salt resource
Change method.
Background technique
Coking wastewater is a kind of typical toxic organic wastewater with difficult degradation thereby.Mainly from coke oven gas primary-cooling and coking production
Industrial water and steam in the process condenses waste water.Refer to coal coking, gas purification, chemical products recycling and chemical products purification
The waste water generated in the process.
Pollutant concentration is high in coking wastewater, it is difficult to degrade, due to the presence of nitrogen in coking wastewater, cause biological cleaning institute
The nitrogen source needed is superfluous, brings larger difficulty to processing is up to standard；Coking wastewater discharge amount is big, and coke water consumption per ton is greater than 2.5t；It is useless
Water harm is big, and polycyclic aromatic hydrocarbon is not only difficult to degrade in coking wastewater, and usual or strong carcinogen, causes seriously to environment
Also human health is directly threatened while pollution.
By taking Yellow River basin as an example, salt concentration is covered in the water of west section area up to 700~800mg/L in the Yellow River, wherein sulfate
The problem of content has been approached water environment quality standard limit value, therefore discharge of wastewater control salt has become urgent need to resolve.Waste water " zero
The solution of discharge " is to crack Modern Coal-based Chemical industry development important channel contradictory with water resource and environment.However, traditional
The crystallization carnallite of waste water " zero " discharge by-product be worth without recycling, be easy to meet water leaching drip exudation, there are secondary pollution risk,
And in wastewater treatment process, micro heavy ion and residual organic matter in water are constantly concentrated, and may eventually enter into knot
In brilliant salt slurry, so that crystal salt may have the hazard property of hazardous waste, therefore, crystallization carnallite Environmental Safety disposition faces tight
One of the problem of high challenge is Modern Coal-based Chemical industry development urgent need to resolve.
When existing related patents technical solution is used for real case, the rate of recovery of crystal salt is lower.According to existing reality
Project and pilot scale situation from the point of view of, guarantee salt quality under the premise of, the rate of recovery still has generally 50~60%, that is, about
40~50% salt can only be used as carnallite outlet, the outlet carnallite amount for not only limiting the recycling of salt, while also increasing, Wu Fada
To the target for dividing salt recycling salt to reduce solid waste.
Summary of the invention
The purpose of the present invention is to overcome the deficiency in the prior art, adapts to realistic development, it is dense to provide a kind of coking wastewater nanofiltration
Contracting liquid divides salt method of resource.
In order to achieve the above objectives, The technical solution adopted by the invention is as follows:
A kind of coking wastewater nanofiltration concentrate divides salt method of resource, includes the following steps:
(1) coking wastewater nanofiltration concentrate enters the adjusting that conditioning tank carries out homogeneous average；
(2) conditioning tank water outlet enters hardness in highly dense sedimentation basin realization coking wastewater nanofiltration concentrate by promoting water pump
Removal；
(3) most of removal of remaining suspension object is realized in highly dense sedimentation basin water outlet by more medium filter；
(4) more medium filter water outlet, which enters, promotes pond, then enters ultrafiltration membrane by promoting water pump and booster water pump
Filtration system realizes the removal of whole suspended matters and colloid substance；
(5) ultrafiltration membrane production water enters ultrafiltration membrane production pond, then enters RO membranous system by RO film raw water pump and high-pressure pump
It is concentrated, 60% production water can realize direct reuse, and 40%RO concentrated water then passes through the organic of electrocatalytic oxidation system removal concentration
Object improves the purity of later crystallization salt；
(6) water outlet of electrocatalytic oxidation system enters high pressure nanofiltration and divides salt system, using the road Nan Xiaoying of nanofiltration membrane, realizes more
Valence anion SO4 2-Efficient retention and Cl- through separation；
(7) contain higher concentration SO4 2-High pressure nanofiltration concentrate pass through MVR evaporative crystallization and freezing and crystallizing unit respectively
Realize that the output of sodium sulfate crystal salt, purity reach 99% or more；
Contain higher concentration Cl-High pressure nanofiltration produce water then pass through sodium chloride crystallizer realize sodium chloride crystal salt production
Out, purity reaches 98.5% or more.
Further, higher concentration SO will be contained4 2-High pressure nanofiltration concentrate by MVR evaporative crystallization mother liquor and contain
Higher concentration Cl-High pressure nanofiltration produce water by sodium chloride crystallizer mother liquor mixing after, obtain awns by freezing and crystallizing unit
Nitre, saltcake realize the output of sulfate crystal salt by sulfate crystal device after saltcake ablation device processing.
Further, the mother liquor of the sulfate crystal device output returns to freezing and crystallizing unit and is recycled.
Further, the nanofiltration membrane is using one section of level-one or the arrangement mode of level-one multistage.
Further, the freezing and crystallizing unit uses two-stage freezing and crystallizing device.
Compared with prior art, the advantages and positive effects of the present invention are as follows:
(1) the characteristics of being based on coking wastewater nanofiltration concentrate high proportion sulfate ion, low ratio chloride ion, by dense
Contracting, again nanofiltration divide salt and evaporative crystallization to realize concentrated water abraum salt recycling；
(2) the characteristics of being based on coking wastewater nanofiltration concentrate high salinity, high current efficiency, integrates electro-catalytic oxidation technology
Realize the organic matter removing of high-salt wastewater.
The method of the present invention have the characteristics that it is easy to operate, stable, divide salt high-efficient to compare with existing point of salt technology,
Ultrahigh concentration saliferous moisture salt is realized, and can achieve the effect that efficiently to divide salt, meanwhile, substantially reduce energy consumption and operating cost.
Detailed description of the invention
Process flow chart Fig. 1 of the invention；
Specific embodiment
In the description of the present invention, it is necessary to understanding, the instructions such as "upper", "lower", "top", "bottom", "inner", "outside"
Orientation or positional relationship is to be based on the orientation or positional relationship shown in the drawings, and target only retouch for ease of description by the present invention and simplification
It states, is not that indication or suggestion institute finger must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot
It is interpreted as limitation of the present invention.
Divide salt effect to verify of the present invention point of salt method of resource to coking wastewater nanofiltration concentrate, below
In conjunction with attached drawing 1, it is illustrated by taking certain coal chemical industry enterprises high project of Treatment of Coking Effluent containing salt industrial as an example.
A kind of coking wastewater nanofiltration concentrate divides salt recycling system, as shown in Figure 1, including the pre- place of reverse osmosis (RO) concentration
Reason, reverse osmosis (RO) concentration, the processing of concentrate organic matter, high pressure nanofiltration divide salt and crystalline element；Above system is used for coking wastewater
Steps are as follows for the salt process for reclaiming that divides of nanofiltration concentrate:
(1) coking wastewater nanofiltration concentrate enters the adjusting that conditioning tank carries out homogeneous average；
(2) conditioning tank water outlet enters hardness in highly dense sedimentation basin realization coking wastewater nanofiltration concentrate by promoting water pump
Removal, detection total hardness is almost nil later, total removal rate 99.8%, COD content < 30mg/L, pH=6~9；
(3) most of removal of remaining suspension object is realized in highly dense sedimentation basin water outlet by more medium filter；
(4) more medium filter water outlet, which enters, promotes pond, then enters ultrafiltration membrane by promoting water pump and booster water pump
Filtration system realizes the removal of whole suspended matters and colloid substance；
(5) ultrafiltration membrane production water enters ultrafiltration membrane production pond, then enters RO membranous system by RO film raw water pump and high-pressure pump
It is concentrated, 60% production water can realize direct reuse, and 40%RO concentrated water then passes through the organic of electrocatalytic oxidation system removal concentration
Object improves the purity of later crystallization salt；
Its principle of electrocatalytic oxidation is to utilize PbO2Electro catalytic activity with higher when electrode is electrolysed in aqueous solution,
In addition high frequency pulse power supply " power supply-power failure-power supply " circular flow equipment is used, the O constantly provided from outside2Trap dispatch from foreign news agency
Field provides electronics, forms oxygen radical ion O2Under the conditions of electro-catalysis, water body generates H2O2, and generation hydroxyl free is induced simultaneously
Base ion OH.Partial organic substances are made to be mineralized into CO2And H2O；Or organic matter (COD) is made to generate electrically charged organic " fragment ", make to have
Machine object macromolecular chain rupture will increase at small molecule, BOD/COD ratio；
(6) water outlet of electrocatalytic oxidation system enters high pressure nanofiltration and divides salt system, and the height into high pressure nanofiltration point salt system contains
The water quality indicator of salt concentrated water is as follows: TDS=72520mg/L, Cl-=19372mg/L, SO4 2-=12815mg/L, total hardness are
4.15mg/L, pH=8.2, flow Q=20L/min；
The road Nan Xiaoying that the high pressure nanofiltration divides salt system to utilize nanofiltration membrane, to realize dianion SO4 2-Efficiently cut
It stays with Cl- through separation, to SO4 2-Rejection reach 90~99%, 85~95% sodium chloride can pass through nanofiltration membrane enter
Produce water side；
High pressure nanofiltration divides salt system under the pressure of 2.0MPa, after dividing salt by high pressure nanofiltration membrane component (rolling nanofiltration membrane)
It generates the monovalence sodium chloride that salt content is 80000~120000mg/L and produces water and divalent sodium sulphate concentrated water, salt content 100000
~150000mg/L.
(7) contain higher concentration SO4 2-High pressure nanofiltration concentrate pass through MVR evaporative crystallization and freezing and crystallizing unit respectively
Realize the output of sodium sulfate crystal salt, dry purity salt reaches 99.3% or more, meets " industrial anhydrous sodium sulfate " (GB/T 6009-
2014) " I class qualified product " standard specified in；
Contain higher concentration Cl-High pressure nanofiltration produce water then pass through sodium chloride crystallizer realize sodium chloride crystal salt production
Out, dry purity salt reaches 98.5% or more, meets " solarization Nacl one specified in " Nacl " (GB/T 5462-2003)
Grade " standard；
Higher concentration SO will be contained4 2-High pressure nanofiltration concentrate by MVR evaporative crystallization mother liquor and contain higher concentration
Cl-High pressure nanofiltration produce mother liquor mixing of the water by sodium chloride crystallizer after, chilled crystalline element obtains saltcake, and saltcake passes through
After saltcake melts device processing, the output of sulfate crystal salt is realized by sulfate crystal device；The sulfate crystal device produces
Mother liquor out returns to freezing and crystallizing unit and is recycled, and the nanofiltration membrane uses three sections of level-one of arrangement mode, the freezing knot
Brilliant unit uses two-stage freezing and crystallizing device.
Above-described embodiment is only more excellent embodiment of the invention, is implemented according to the technical essence of the invention to above
Any simple modification, modification and the alternate variation that example is made, belong in the range of technical solution of the present invention.
Claims (5)
1. a kind of coking wastewater nanofiltration concentrate divides salt method of resource, which comprises the steps of:
(1) coking wastewater nanofiltration concentrate enters the adjusting that conditioning tank carries out homogeneous average；
(2) conditioning tank water outlet enters highly dense sedimentation basin by promoting water pump and realizes that hardness is gone in coking wastewater nanofiltration concentrate
It removes；
(3) most of removal of remaining suspension object is realized in highly dense sedimentation basin water outlet by more medium filter；
(4) more medium filter water outlet, which enters, promotes pond, then enters ultrafiltration membrance filter by promoting water pump and booster water pump
System realizes the removal of whole suspended matters and colloid substance；
(5) ultrafiltration membrane production water enters ultrafiltration membrane production pond, then enters RO membranous system by RO film raw water pump and high-pressure pump and carries out
Concentration, 60% production water can realize direct reuse, and 40%RO concentrated water then passes through the organic matter of electrocatalytic oxidation system removal concentration, mentions
The purity of high later crystallization salt；
(6) water outlet of electrocatalytic oxidation system enters high pressure nanofiltration and divides salt system, using the road Nan Xiaoying of nanofiltration membrane, realizes multivalence yin
Ion SO4 2-Efficient retention and Cl- through separation；
(7) contain higher concentration SO4 2-High pressure nanofiltration concentrate pass through MVR evaporative crystallization and freezing and crystallizing unit respectively and realize
The output of sodium sulfate crystal salt, purity reach 99% or more；
Contain higher concentration Cl-High pressure nanofiltration produce water then pass through sodium chloride crystallizer realize sodium chloride crystal salt output, purity
Reach 98.5% or more.
2. a kind of coking wastewater nanofiltration concentrate according to claim 1 divides salt method of resource, which is characterized in that will
Contain higher concentration SO4 2-High pressure nanofiltration concentrate by MVR evaporative crystallization mother liquor and contain higher concentration Cl-High pressure
After nanofiltration produces mother liquor mixing of the water by sodium chloride crystallizer, saltcake is obtained by freezing and crystallizing unit, saltcake disappears by saltcake
After melting device processing, the output of sulfate crystal salt is realized by sulfate crystal device.
3. a kind of coking wastewater nanofiltration concentrate according to claim 2 divides salt method of resource, which is characterized in that institute
The mother liquor for stating sulfate crystal device output returns to freezing and crystallizing unit and is recycled.
4. a kind of coking wastewater nanofiltration concentrate according to claim 1 divides salt method of resource, which is characterized in that institute
Nanofiltration membrane is stated using one section of level-one or the arrangement mode of level-one multistage.
5. a kind of coking wastewater nanofiltration concentrate according to claim 1 divides salt method of resource, which is characterized in that institute
Freezing and crystallizing unit is stated using two-stage freezing and crystallizing device.
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Cited By (7)
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| CN113912231A (en) * | 2021-07-13 | 2022-01-11 | 北京航天环境工程有限公司 | System and method for recycling and co-processing wastewater |
| CN114105377A (en) * | 2021-10-25 | 2022-03-01 | 苏州镐丰环境科技有限公司 | Landfill leachate treatment system and process |
| WO2022109892A1 (en) * | 2020-11-26 | 2022-06-02 | 深圳市倍鸣洋科技有限公司 | Zero-discharge wastewater treatment method |
| WO2022109893A1 (en) * | 2020-11-26 | 2022-06-02 | 深圳市倍鸣洋科技有限公司 | Magnetizing apparatus for use in water treatment and applications thereof |
| CN114656092A (en) * | 2022-04-22 | 2022-06-24 | 倍杰特集团股份有限公司 | Zero-discharge salt separation treatment system and method for coking wastewater |
| CN114804484A (en) * | 2022-04-22 | 2022-07-29 | 倍杰特集团股份有限公司 | Coking wastewater crystallization separation device and process |
| CN114804483A (en) * | 2022-04-22 | 2022-07-29 | 倍杰特集团股份有限公司 | Classification extraction device and extraction process for coking wastewater crystalline salt |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022109892A1 (en) * | 2020-11-26 | 2022-06-02 | 深圳市倍鸣洋科技有限公司 | Zero-discharge wastewater treatment method |
| WO2022109893A1 (en) * | 2020-11-26 | 2022-06-02 | 深圳市倍鸣洋科技有限公司 | Magnetizing apparatus for use in water treatment and applications thereof |
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| CN114105377A (en) * | 2021-10-25 | 2022-03-01 | 苏州镐丰环境科技有限公司 | Landfill leachate treatment system and process |
| CN114656092A (en) * | 2022-04-22 | 2022-06-24 | 倍杰特集团股份有限公司 | Zero-discharge salt separation treatment system and method for coking wastewater |
| CN114804484A (en) * | 2022-04-22 | 2022-07-29 | 倍杰特集团股份有限公司 | Coking wastewater crystallization separation device and process |
| CN114804483A (en) * | 2022-04-22 | 2022-07-29 | 倍杰特集团股份有限公司 | Classification extraction device and extraction process for coking wastewater crystalline salt |
| CN114656092B (en) * | 2022-04-22 | 2022-12-13 | 倍杰特集团股份有限公司 | Zero-discharge salt separation treatment system and method for coking wastewater |
| CN114804483B (en) * | 2022-04-22 | 2023-02-03 | 倍杰特集团股份有限公司 | Classification extraction device and extraction process for coking wastewater crystalline salt |
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