CN102030437B - Method for comprehensive wastewater desalination and zero pollution release in steel production - Google Patents
Method for comprehensive wastewater desalination and zero pollution release in steel production Download PDFInfo
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- CN102030437B CN102030437B CN2010105365954A CN201010536595A CN102030437B CN 102030437 B CN102030437 B CN 102030437B CN 2010105365954 A CN2010105365954 A CN 2010105365954A CN 201010536595 A CN201010536595 A CN 201010536595A CN 102030437 B CN102030437 B CN 102030437B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The invention discloses a method for comprehensive wastewater desalination and zero release in steel production, belonging to the technical field of wastewater desalination and zero release. The method comprises the following steps of: introducing wastewater to a regulating pond through a fence, wherein the regulating pond is provided with a deoiling device; deoiling the wastewater; then introducing the wastewater into a lime softening flocculation precipitation system; enabling a supernatant to be subjected to neutralization, sand filtration, chlorination, multi-medium filtration and then introducing into a micro-filtration system, a cartridge filter and a primary reverse osmosis system; introducing primary reverse osmosis strong brine to a lime sodium carbonate softening system, the cartridge filter and a secondary reverse osmosis system; introducing secondary reverse osmosis strong brine for steelmaking and slag stewing so as to achieve zero release; and returning primary reverse osmosis demineralized water and secondary reverse osmosis demineralized water to the steel production process for application. The method has the advantages that a film is not blocked easily and the service life of equipment is long because the micro-filtration system, the primary reverse osmosis system, the resin softening system, the cartridge filter and the secondary reverse osmosis system are utilized. The primary reverse osmosis strong brine is introduced to the lime sodium carbonate softening system, the cartridge filter and the secondary reverse osmosis system; and the secondary reverse osmosis strong brine is introduced for steelmaking and slag stewing so as to achieve zero release of the wastewater.
Description
Technical field
The invention belongs to waste water desalination, zero blowdown technical field, comprehensive wastewater desalination zero blowdown method in a kind of Iron and Steel Production particularly is provided, be applicable to desalination of metallurgy industry waste water recycling and zero blowdown.
Background technology
At present, during the steel wastewater desalination, the general employing reclaimed sewage, A, produces middle water: get the metallurgy industry effluent sewerage through flocculation, deposition, reach the middle water requirement of water suspension less than 100mg/l; B. middle water treatment: water in above-mentioned through fine fack filtration, sterilization and disinfection, little flocculation treatment, is held back hair, remove partial organic substances, make its COD less than 30mg/l; C. uf processing: the middle water of above-mentioned processing is immersed ultra-filtration equipment through external pressure handle, reach the requirement of SDI＜2; D. reverse osmosis desalination is handled: the water after uf processing gets into the reverse osmosis unit desalting treatment.This complex process, running cost is high, adopts external pressure immerseable ultra-filtration equipment, and film is prone to stop up, and the film silk ruptures easily, and water production rate descends, and equipment operation life is lower, and reverse osmosis concentrated salt solution effluxes, and causes environmental pollution.
Perhaps adopt cooling tower, raw water box, micro flocculating filter device, by-pass flow activated carbon filtration jar, laminated filter, ultrafiltration system, accurate filter, reverse osmosis system, reverse osmosis desalination water tank.Be used to solve the problem of the two embrane method desalinations of iron and steel enterprise's composite wastewater reuse water.Adopt two embrane method desalinations, will pass through pretreated water and handle through ultra-filtration equipment earlier, reach the requirement of SDI≤3, carry out desalination through reverse osmosis unit again and handle.Filter combined mode iron and steel composite wastewater reuse water is handled with preoxidation, micro flocculating filter, by-pass flow activated carbon filtration, self-stip.The activated carbon filtration working cost is very high in this technology, and laminated filter and ultrafiltration are easy to stop up, and water production rate descends, and equipment operation life is lower, and reverse osmosis concentrated salt solution effluxes, and causes environmental pollution.
Comprehensive wastewater zero blowdown technology and method in this Iron and Steel Production: the iron and steel comprehensive wastewater is collected and is adopted barrier, oil removing, the softening flocculation sediment of lime, neutralization, husky filtration, chlorination, multi-medium filtering, microfiltration systems, security personnel's strainer, first-stage reverse osmosis system, lime yellow soda ash melded system, security personnel's strainer, two-pass reverse osmosis system, strong brine to the steel-making slag stewing, reaches zero release.This technology pre-treatment adopts that lime is softening, husky filter, multi-medium filtering, working cost are low, oil removing, go COD effective.Two embrane method desalinations generally adopt ultrafiltration and reverse osmosis system, this process using micro-filtration, first-stage reverse osmosis system, resin melded system, security personnel's strainer, two-pass reverse osmosis system, and film is difficult for stopping up, and equipment life is long.Reverse osmosis concentrated salt solution generally effluxes, and causes environmental pollution.
Summary of the invention
The object of the present invention is to provide comprehensive wastewater desalination zero blowdown method in a kind of Iron and Steel Production, solved the new water yield height of consumption in the Iron and Steel Production, the problem that water amount of blowdown is big.The present invention adopts reverse osmosis concentrated salt solution to handle to the steelworks slag stewing, reaches the purpose of process for producing steel and iron waste water zero blowdown.
Technology of the present invention is: the waste water in the Iron and Steel Production to equalizing tank, has waste-oil scavenger, waste water oil removing after lime softens flocculation sedimentation system, supernatant specific conductivity behind neutralization, sand filtration, chlorination, multi-medium filtering, microfiltration systems, security personnel's strainer, first-stage reverse osmosis system, first-stage reverse osmosis is that the 3000uS/cm strong brine is through lime yellow soda ash melded system through barrier on the equalizing tank; Through removing the sodium ion exchange resin of barium, strontium, remove back barium less than 0.5mg/l, strontium is less than 0.5mg/l, and through security personnel's strainer, two-pass reverse osmosis system, specific conductivity to the steel-making slag stewing, reaches zero release greater than the 9000uS/cm strong brine behind the two-pass reverse osmosis; First-stage reverse osmosis de-mineralized water, two-pass reverse osmosis de-mineralized water send back in the process for producing steel and iron to be used.
After lime was softening, the water hardness was less than 150mg/l, and the art breading COD before the multi-medium filtering is less than 15mg/l, the filtering velocity 10m/h of more medium filter, and the membrane pore size of micro-filtration is greater than 0.1 micron.Microfiltration membrane net flux 65L/m
2.h, SDI is less than 1.5, reverse osmosis membrane flux 17L/m
2.h.
The invention has the advantages that, adopt that lime is softening, husky filter, multi-medium filtering, working cost are low, oil removing, go COD effective.Two embrane method desalinations generally adopt ultrafiltration and reverse osmosis system, this process using micro-filtration, security personnel's strainer, first-stage reverse osmosis system, lime yellow soda ash melded system, security personnel's strainer, two-pass reverse osmosis system, and film is difficult for stopping up, and equipment life is long.Reverse osmosis concentrated salt solution generally effluxes, and causes environmental pollution, and the reverse osmosis concentrated salt solution of this process using carries out the slag stewing of steelworks to be handled, and reaches the purpose of process for producing steel and iron waste water zero blowdown.
Description of drawings
Fig. 1 is the schematic flow sheet of comprehensive wastewater zero blowdown technology and method in the Iron and Steel Production of the present invention.Wherein, Iron and steel comprehensive wastewater process barrier, oil removing are after lime softens flocculation sedimentation system, supernatant water to the steelworks slag stewing, reaches zero release through lime yellow soda ash melded system, security personnel's strainer, two-pass reverse osmosis system, two-pass reverse osmosis strong brine through neutralization, sand filtration, chlorination, multi-medium filtering, microfiltration systems, security personnel's strainer, first-stage reverse osmosis system, first-stage reverse osmosis strong brine.First-stage reverse osmosis de-mineralized water, two-pass reverse osmosis de-mineralized water send back in the process for producing steel and iron to be used.
Embodiment
Below in conjunction with accompanying drawing 1 explanation embodiment of the present invention.
As shown in Figure 1: iron and steel comprehensive wastewater process barrier, oil removing are after lime softens flocculation sedimentation system, supernatant water to the steelworks slag stewing, reaches zero release through lime yellow soda ash melded system, security personnel's strainer, two-pass reverse osmosis system, two-pass reverse osmosis strong brine through neutralization, sand filtration, chlorination, multi-medium filtering, microfiltration systems, security personnel's strainer, first-stage reverse osmosis system, first-stage reverse osmosis strong brine.First-stage reverse osmosis de-mineralized water, two-pass reverse osmosis de-mineralized water send back in the process for producing steel and iron to be used.Technical parameter is following in the technology:
Waste water arrives equalizing tank through barrier; Waste-oil scavenger, waste water oil removing are arranged after lime softens flocculation sedimentation system, supernatant filters (COD is less than 15mg/l after the sand filtration), chlorination, multi-medium filtering (filtering velocity of more medium filter is less than 10m/h), microfiltration systems (the membrane pore size 0.1-0.15 micron of micro-filtration, film net flux 65L/m through neutralization, sand on the equalizing tank
2.h), specific conductivity is that the 3000uS/cm strong brine is through lime yellow soda ash melded system (after lime yellow soda ash is softening behind security personnel strainer, first-stage reverse osmosis system, the first-stage reverse osmosis; The water hardness is less than 150mg/l), (barium is less than 0.5mg/l after removing through the sodium ion exchange resin of removing barium, strontium; Strontium is less than 0.5mg/l); Specific conductivity to the steel-making slag stewing, reaches zero release greater than the 9000uS/cm strong brine behind security personnel's strainer, two-pass reverse osmosis system, two-pass reverse osmosis; First-stage reverse osmosis de-mineralized water, two-pass reverse osmosis de-mineralized water send back in the process for producing steel and iron to be used.
Claims (2)
1. comprehensive wastewater zero blowdown method in the Iron and Steel Production; It is characterized in that; Waste water in the Iron and Steel Production to equalizing tank, has waste-oil scavenger, waste water oil removing after lime softens flocculation sedimentation system, supernatant specific conductivity behind neutralization, sand filtration, chlorination, multi-medium filtering, microfiltration systems, security personnel's strainer, first-stage reverse osmosis system, first-stage reverse osmosis is that the 3000us/cm strong brine is through lime yellow soda ash melded system through barrier on the equalizing tank; Through removing the sodium ion exchange resin of barium, strontium, remove back barium less than 0.5mg/L, strontium is less than 0.5mg/L, and through security personnel's strainer, two-pass reverse osmosis system, specific conductivity to the steel-making slag stewing, reaches zero release greater than the 9000us/cm strong brine behind the two-pass reverse osmosis; First-stage reverse osmosis de-mineralized water, two-pass reverse osmosis de-mineralized water send back in the process for producing steel and iron to be used.
2. according to the described method of claim 1, it is characterized in that, after said lime is softening; The water hardness is less than 150mg/L; Art breading COD before the multi-medium filtering is less than 15mg/L, the filtering velocity 10m/h-15m/h of more medium filter, the membrane pore size 0.1-0.15 micron of micro-filtration; Microfiltration membrane net flux 65L/m
2.h, SDI is less than 1.5, reverse osmosis membrane flux 17L/m
2.h.
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| CN102030437B true CN102030437B (en) | 2012-11-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102452749B (en) * | 2011-07-19 | 2013-06-05 | 北京博泰盛合科技有限公司 | Process for preparing desalted water from iron and steel enterprises sewage with high conversion rate |
| CN102311187A (en) * | 2011-07-19 | 2012-01-11 | 北京博泰盛合科技有限公司 | Process for realizing zero discharge of industrial waste of steel enterprises |
| CN102491574B (en) * | 2011-12-28 | 2013-07-31 | 武汉钢铁(集团)公司 | Advanced treatment technology for comprehensive wastewater of iron and steel enterprises |
| CN103253799A (en) * | 2012-02-17 | 2013-08-21 | 中冶赛迪工程技术股份有限公司 | Steel production wastewater reuse treatment process |
| CN103172203B (en) * | 2013-03-28 | 2014-10-08 | 南京中电环保股份有限公司 | Pretreatment method of anti-osmosis strong brine |
| CN104163516B (en) * | 2013-05-17 | 2016-07-06 | 宝山钢铁股份有限公司 | A kind of reuse method of stainless-steel cold-rolling waste water |
| CN104176845B (en) * | 2013-05-20 | 2015-12-09 | 宝山钢铁股份有限公司 | A kind of process for reclaiming of cold rolling alkaline oily(waste)water |
| CN103523980B (en) * | 2013-10-29 | 2014-12-03 | 中国华电工程(集团)有限公司 | Method and system for high-efficiency recovery of high-salinity mine water |
| CN104671499B (en) * | 2015-02-01 | 2016-04-27 | 山西太钢不锈钢股份有限公司 | Smelt composite wastewater advanced treatment separate-recycling method |
| CN108358375B (en) * | 2018-04-28 | 2020-08-11 | 工大环境股份有限公司 | Industrial sewage treatment method |
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| CN101462801A (en) * | 2009-01-16 | 2009-06-24 | 首钢总公司 | Steel composite wastewater recycle-water double-membrane demineralization system and technique |
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| CN201362628Y (en) * | 2008-12-24 | 2009-12-16 | 北京时代沃顿科技有限公司 | Reverse osmosis membrane water treatment device for resisting microbial contamination |
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| JP3800450B2 (en) * | 1997-03-28 | 2006-07-26 | 株式会社荏原製作所 | Method and apparatus for treating organic wastewater containing high concentrations of salts |
| US20100163471A1 (en) * | 2008-12-30 | 2010-07-01 | Irving Elyanow | Water desalination plant and system for the production of pure water and salt |
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| CN201362628Y (en) * | 2008-12-24 | 2009-12-16 | 北京时代沃顿科技有限公司 | Reverse osmosis membrane water treatment device for resisting microbial contamination |
| CN101462801A (en) * | 2009-01-16 | 2009-06-24 | 首钢总公司 | Steel composite wastewater recycle-water double-membrane demineralization system and technique |
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Effective date of registration: 20140404 Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Beijing Shougang Co., Ltd. Address before: Yangzidian Town, Qian'an City, Hebei province 064404 Patentee before: Hebei Shougang Qian'an Steel Co., Ltd. Patentee before: Capital Iron & Steel General Company |