CN103073143A - Strong brine zero emission treatment process for iron and steel plant - Google Patents

Strong brine zero emission treatment process for iron and steel plant Download PDF

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Publication number
CN103073143A
CN103073143A CN2013100123011A CN201310012301A CN103073143A CN 103073143 A CN103073143 A CN 103073143A CN 2013100123011 A CN2013100123011 A CN 2013100123011A CN 201310012301 A CN201310012301 A CN 201310012301A CN 103073143 A CN103073143 A CN 103073143A
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reverse osmosis
water
strong brine
enters
grades
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CN2013100123011A
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CN103073143B (en
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张涛
段小冰
吕立铭
张岩岗
寇彦德
周立
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Shougang Group Co Ltd
Shougang Corp
Beijing Shougang International Engineering Technology Co Ltd
Hebei Shougang Qianan Iron and Steel Co Ltd
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Shougang Corp
Beijing Shougang International Engineering Technology Co Ltd
Hebei Shougang Qianan Iron and Steel Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124Water desalination
    • Y02A20/131Reverse-osmosis

Abstract

A strong brine zero emission treatment process for an iron and steel plant belongs to the technical field of steel waste water treatment and recycle. The treatment process flow of using a fiber ball filter, a second-level reverse osmosis device, a third-level reverse osmosis device and an evaporative crystallization device. The strong brine of the iron and steel plant is lifted to be conveyed to the fiber ball filter to be filtered, the effluent from the fiber ball filter goes into the second-level reverse osmosis device, and is then lifted by a water pump to a 5mum cartridge filter and pumped by a high pressure pump to the second-level reverse osmosis device, the product water goes into a desalting pond and the strong brine goes into a second-level reverse osmosis strong brine pond. The second-level reverse osmosis strong brine is lifted by the water pump to the 5Mum cartridge filter and is then conveyed to the third-level reverse osmosis device by the high pressure pump, the product water goes into the desalting pond and the strong brine goes into a third-level reverse osmosis strong brine pond. The third-level reverse osmosis strong brine is lifted by the water pump to the evaporative crystallization device, the condensed water produced by the evaporative crystallization device is conveyed to the desalting pond, and solid crystal substances are transported outside for disposal.

Description

A kind of Steel Plant strong brine Zero-discharge treating process
Technical field
The invention belongs to that steel wastewater is processed and the reuse technology field, particularly a kind of Steel Plant strong brine Zero-discharge treating process.
Background technology
According to China Steel association statistics, China's crude steel output reached 62,665 ten thousand tons in 2010, accounted for 37.75% of world's crude steel output.Steel industry is the water rich and influential family in the whole nation, accounts for 14% of national industrial water consumption.Therefore the water-saving and emission-reducing of steel industry has important environment protection significance and social benefit.Aggravation along with the shortage of water resources situation, the wastewater reuse rate has improved by modes such as employing water in series, cycling use of water, multi-purpose water and classification uses in iron and steel enterprise, and the important prerequisite that these modes realize is the application of ion exchange technique and reverse osmosis membrane technology.Particularly in the last few years, reverse osmosis membrane technology rely on that its stable performance, floor space are little, low characteristics such as simple of working cost and obtained fast development at steel industry.
Domestic large-scale iron and steel enterprise has all set up the waste water advanced treatment recovery system at present, and " coagulation+clarification+filtration+ultrafiltration+reverse osmosis " technology is adopted in its technical process, has obtained good economic benefit and environmental benefit.A strong brine part that produces after the advanced treatment can be delivered to blast furnace and be used for flushing cinder or deliver to converter being used for vexed slag, but the strong brine water yield is larger, and most of strong brine can only directly discharge, and does not reach the zero release of Steel Plant's strong brine.Saltiness is higher in the strong brine, and contains the chemical agents such as a large amount of Scale inhibitorss, reductive agent, clean-out system, sterilant, if directly be discharged into local water body, can local water body be polluted, and the growth of animal and plant is also had a great impact.There is strict demand in country to the discharging of strong brine at present, whether zero release is the great environmental issue that current built or newly-built Steel Plant face to strong brine, some environment vulnerable area again, strong brine zero release have become the prerequisite of building iron and steel or proceeding Iron and Steel Production.
This shows that the zero release of strong brine is one of iron and steel enterprise's sustainable development path.Yet high investment and high running cost are usually limiting the industrial application of zero-discharge technology.Therefore domesticly there is no the zero release that strong brine has really been accomplished by an iron and steel enterprise.
Summary of the invention
The object of the present invention is to provide a kind of Steel Plant strong brine Zero-discharge treating process, exploitation Xin Shui water source reduces the new water consumption of ton steel from strong brine.
The present invention adopts " fiber ball filter+second level reverse osmosis apparatus+three grade reverse osmosis unit+evaporated crystallization device " processing technological flow.The technical parameter of controlling in the skill is:
Steel Plant's strong brine is delivered to fiber ball filter through lifting and is filtered, and its filtration velocity is 6-9m/h; Fiber ball filter can effectively be removed the SS in the water, and CODcr and oil, delivery turbidity are lower than 1.0 NTU, has satisfied the influent quality of reverse osmosis process; The water outlet of fiber ball filter enters the two-pass reverse osmosis feed cistern, delivers to the cartridge filter of 5 μ m through water pump lifting, delivers to second level reverse osmosis apparatus by the high-pressure pump pressurization again, and its product water enters the desalination pond, and strong brine enters two-pass reverse osmosis strong brine pond; Second level reverse osmosis apparatus adopts coiled reverse osmosis membrane element, flux≤17L/m2h, and the system recoveries rate is 60%, ratio of desalinization can reach more than 95%; For preventing reverse osmosis membrane fouling and oxidized, add Scale inhibitors and reductive agent at the second level reverse osmosis apparatus entrance, the scale inhibitor dosing amount is 3-5mg/L, the reductive agent dosage is 3-6mg/L; As reverse osmosis unit water production rate decline 10-15%, perhaps produce water deteriorating water quality 10-15%, when perhaps the system pressure difference between water inlet and the dense water is elevated to 1.5 times of initial value, need to clean reverse osmosis unit, the cleaning interval is 28~32 days.
The two-pass reverse osmosis strong brine is delivered to the cartridge filter of 5 μ m through water pump lifting, delivers to three grades of reverse osmosis units by the high-pressure pump pressurization again, and its product water enters the desalination pond, and strong brine enters three grades of reverse osmosis concentrated brine tanks; Three grades of reverse osmosis units adopt the hollow fiber type reverse-osmosis membrane element, and long service life is difficult for dirty stifled.The system recoveries rate of three grades of reverse osmosis units is 50%, and ratio of desalinization can reach more than 95%; For preventing reverse osmosis membrane fouling and oxidized, add Scale inhibitors at three grades of reverse osmosis unit entrances, the scale inhibitor dosing amount is 1-3mg/L.
Three grades of reverse osmosis concentrated salt solution is delivered to the preheater of evaporated crystallization device through water pump, and the water of condensation that produces with vaporizer is preheated to vaporization temperature with strong brine; Strong brine after the preheating enters degasifier and removes most of noncondensable gas in the strong brine; Then enter falling-film evaporator and carry out the heat exchange evaporation, the secondary steam of generation is reused for the strong brine that heating enters vaporizer after improving steam quality by vapour compressor compression workmanship; Water of condensation behind evaporation and heat-exchange enters the water of condensation regulating tank, is promoted to preheater preheating strong brine through condensate pump, and the water of condensation after the heat exchange is delivered to the desalination pond; Concentrated solution in vaporizer is disposed to the concentrated solution regulating tank, delivers to pressure filter dosing press filtration through concentrate pump, and supernatant liquor returns evaporation equipment, and solid crystal beyond the region of objective existence fortune is disposed.
Steel Plant of the present invention strong brine is delivered to fiber ball filter through lifting and is filtered, the water outlet of fiber ball filter enters the two-pass reverse osmosis feed cistern, deliver to the cartridge filter of 5 μ m through water pump lifting, deliver to second level reverse osmosis apparatus by the high-pressure pump pressurization again, its product water enters the desalination pond, and strong brine enters two-pass reverse osmosis strong brine pond.
Two-pass reverse osmosis strong brine of the present invention is delivered to the cartridge filter of 5 μ m through water pump lifting, delivers to three grades of reverse osmosis units by the high-pressure pump pressurization again, and its product water enters the desalination pond, and strong brine enters three grades of reverse osmosis concentrated brine tanks.
Three grades of reverse osmosis concentrated salt solution of the present invention are delivered to evaporated crystallization device through water pump, and the water of condensation that evaporated crystallization device produces is delivered to the desalination pond, and solid crystal beyond the region of objective existence fortune is disposed.
The invention has the advantages that, the strong brine rate of recovery 100%, stable effluent quality, the characteristics such as operational management convenience can be widely used in domestic Steel Plant strong brine to process, and really realize Steel Plant's strong brine zero release.
Description of drawings
Fig. 1 is Steel Plant's strong brine treatment zero draining process flow sheet of the specific embodiment of the invention.
Embodiment
The embodiment of Steel Plant's strong brine treatment zero draining method is as follows:
Steel Plant's strong brine is delivered to fiber ball filter through lifting and is filtered, and its filtration velocity is 6-9m/h.Fiber ball filter can effectively be removed the SS in the water, COD CrAnd oil, delivery turbidity is lower than 1.0 NTU, has satisfied the influent quality of reverse osmosis process.The water outlet of fiber ball filter enters the two-pass reverse osmosis feed cistern, delivers to the cartridge filter of 5 μ m through water pump lifting, delivers to second level reverse osmosis apparatus by the high-pressure pump pressurization again, and its product water enters the desalination pond, and strong brine enters two-pass reverse osmosis strong brine pond.Second level reverse osmosis apparatus adopts coiled reverse osmosis membrane element, flux≤17L/m 2H, the system recoveries rate is 60%, ratio of desalinization can reach more than 95%.For preventing reverse osmosis membrane fouling and oxidized, add Scale inhibitors and reductive agent at the second level reverse osmosis apparatus entrance, the scale inhibitor dosing amount is 3-5mg/L, the reductive agent dosage is 3-6mg/L.As reverse osmosis unit water production rate decline 10-15%, perhaps produce water deteriorating water quality 10-15%, when perhaps the system pressure difference between water inlet and the dense water is elevated to 1.5 times of initial value, need to clean reverse osmosis unit, the cleaning interval is 30 days.
The two-pass reverse osmosis strong brine is delivered to the cartridge filter of 5 μ m through water pump lifting, delivers to three grades of reverse osmosis units by the high-pressure pump pressurization again, and its product water enters the desalination pond, and strong brine enters three grades of reverse osmosis concentrated brine tanks.Three grades of reverse osmosis units adopt the hollow fiber type reverse-osmosis membrane element, and long service life is difficult for dirty stifled.The system recoveries rate of three grades of reverse osmosis units is 50%, and ratio of desalinization can reach more than 95%.For preventing reverse osmosis membrane fouling and oxidized, add Scale inhibitors at three grades of reverse osmosis unit entrances, the scale inhibitor dosing amount is 1-3mg/L.
Three grades of reverse osmosis concentrated salt solution is delivered to the preheater of evaporated crystallization device through water pump, and the water of condensation that produces with vaporizer is preheated to vaporization temperature with strong brine; Strong brine after the preheating enters degasifier and removes most of noncondensable gas in the strong brine; Then enter falling-film evaporator and carry out the heat exchange evaporation, the secondary steam of generation is reused for the strong brine that heating enters vaporizer after improving steam quality by vapour compressor compression workmanship.Water of condensation behind evaporation and heat-exchange enters the water of condensation regulating tank, is promoted to preheater preheating strong brine through condensate pump, and the water of condensation after the heat exchange is delivered to the desalination pond.Concentrated solution in vaporizer is disposed to the concentrated solution regulating tank, delivers to pressure filter dosing press filtration through concentrate pump, and supernatant liquor returns evaporation equipment, and solid crystal beyond the region of objective existence fortune is disposed.

Claims (1)

1. Steel Plant's strong brine Zero-discharge treating process adopts " fiber ball filter+second level reverse osmosis apparatus+three grade reverse osmosis unit+evaporated crystallization device " processing technological flow; The technical parameter of controlling in the technique is:
Steel Plant's strong brine is delivered to fiber ball filter through lifting and is filtered, and its filtration velocity is 6-9m/h; Fiber ball filter can effectively be removed the SS in the water, and CODcr and oil, delivery turbidity are lower than 1.0 NTU, has satisfied the influent quality of reverse osmosis process; The water outlet of fiber ball filter enters the two-pass reverse osmosis feed cistern, delivers to the cartridge filter of 5 μ m through water pump lifting, delivers to second level reverse osmosis apparatus by the high-pressure pump pressurization again, and its product water enters the desalination pond, and strong brine enters two-pass reverse osmosis strong brine pond; Second level reverse osmosis apparatus adopts coiled reverse osmosis membrane element, flux≤17L/m2h, and the system recoveries rate is 60%, ratio of desalinization reaches more than 95%; For preventing reverse osmosis membrane fouling and oxidized, add Scale inhibitors and reductive agent at the second level reverse osmosis apparatus entrance, the scale inhibitor dosing amount is 3-5mg/L, the reductive agent dosage is 3-6mg/L; As reverse osmosis unit water production rate decline 10-15%, perhaps produce water deteriorating water quality 10-15%, when perhaps the system pressure difference between water inlet and the dense water is elevated to 1.5 times of initial value, need to clean reverse osmosis unit, the cleaning interval is 28~32 days;
The two-pass reverse osmosis strong brine is delivered to the cartridge filter of 5 μ m through water pump lifting, delivers to three grades of reverse osmosis units by the high-pressure pump pressurization again, and its product water enters the desalination pond, and strong brine enters three grades of reverse osmosis concentrated brine tanks; Three grades of reverse osmosis units adopt the hollow fiber type reverse-osmosis membrane element; The system recoveries rate of three grades of reverse osmosis units is 50%, and ratio of desalinization reaches more than 95%; For preventing reverse osmosis membrane fouling and oxidized, add Scale inhibitors at three grades of reverse osmosis unit entrances, the scale inhibitor dosing amount is 1-3mg/L;
Three grades of reverse osmosis concentrated salt solution is delivered to the preheater of evaporated crystallization device through water pump, and the water of condensation that produces with vaporizer is preheated to vaporization temperature with strong brine; Strong brine after the preheating enters degasifier and removes most of noncondensable gas in the strong brine; Then enter falling-film evaporator and carry out the heat exchange evaporation, the secondary steam of generation is reused for the strong brine that heating enters vaporizer after improving steam quality by vapour compressor compression workmanship; Water of condensation behind evaporation and heat-exchange enters the water of condensation regulating tank, is promoted to preheater preheating strong brine through condensate pump, and the water of condensation after the heat exchange is delivered to the desalination pond; Concentrated solution in vaporizer is disposed to the concentrated solution regulating tank, delivers to pressure filter dosing press filtration through concentrate pump, and supernatant liquor returns evaporation equipment, and solid crystal beyond the region of objective existence fortune is disposed.
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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN107500464A (en) * 2017-09-27 2017-12-22 唐山三友集团兴达化纤有限公司 A kind of method for handling viscose rayon factory acid waste water
CN109205717A (en) * 2018-10-29 2019-01-15 国家能源投资集团有限责任公司 A kind of non-crystal seed method evaporation process method and processing system of waste water

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CN102807296A (en) * 2012-08-30 2012-12-05 北京鑫佰利科技发展有限公司 Process for deeply treating and recycling high-salinity industrial waste water

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CN101830592A (en) * 2010-05-11 2010-09-15 吴志文 Nickel-containing washing waste water recycling treatment system
CN202164198U (en) * 2011-07-12 2012-03-14 广州雅津水处理设备有限公司 Zero-discharge concentration processing equipment for waste deplating water
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107500464A (en) * 2017-09-27 2017-12-22 唐山三友集团兴达化纤有限公司 A kind of method for handling viscose rayon factory acid waste water
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CN109205717A (en) * 2018-10-29 2019-01-15 国家能源投资集团有限责任公司 A kind of non-crystal seed method evaporation process method and processing system of waste water

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