CN101492214B - Membrane separation process for lead-zinc smelting wastewater - Google Patents

Membrane separation process for lead-zinc smelting wastewater Download PDF

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Publication number
CN101492214B
CN101492214B CN2009101150005A CN200910115000A CN101492214B CN 101492214 B CN101492214 B CN 101492214B CN 2009101150005 A CN2009101150005 A CN 2009101150005A CN 200910115000 A CN200910115000 A CN 200910115000A CN 101492214 B CN101492214 B CN 101492214B
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China
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water
lead
wastewater
zinc smelting
membrane separation
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CN2009101150005A
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CN101492214A (en
Inventor
张铭发
龙燕
明亮
张伟健
钟勇
吴健强
吴斌秀
关泽安
陈忠
张宏伟
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China ruim engineering technology Limited by Share Ltd
Shaoguan Smelter, Shenzhen Zhongjin Lingnan Nonfemet Co., Ltd.
Original Assignee
SHAOGUAN SMELTER SHENZHEN ZHONGJIN LINGNAN NONFEMET CO Ltd
China Nerin Engineering Co Ltd
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Priority to CN2009101150005A priority Critical patent/CN101492214B/en
Publication of CN101492214A publication Critical patent/CN101492214A/en
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Abstract

The invention discloses a membrane separation process for treating lead-zinc smelting wastewater, which comprises the following steps: pretreating lead-zinc smelting industrial wastewater through the processes of a multi-media filter, ultrafiltration, and the like after the wastewater reaches the discharge standard after the treatment of a heavy metal precipitation process; and performing desalinization treatment on the wastewater by a nanofiltration process, wherein water is produced for recycling and a concentrated solution reaches the standard after an intensified coagulation treatment and is discharged. The membrane separation process has the advantages of high wastewater recovery ratio by adopting a membrane process to perform recycling treatment on the lead-zinc smelting wastewater, good recycling water quality, advanced performance and economical practicability, high automation degree, and simple and convenient manual operation.

Description

The membrane separation process of lead-zinc smelting wastewater
Technical field
The present invention relates to a kind of trade effluent separation method, especially a kind of membrane separation process of lead-zinc smelting wastewater.
Background technology
The present situation that effluxes after the trade effluent of domestic main lead-zinc smelting enterprise adopts the heavy metal precipitation art breading up to standard, the waste water reclamation rate is low, reclaims water quality inferiority.
Summary of the invention
The object of the present invention is to provide a kind of membrane separation process of lead-zinc smelting wastewater, this processing wastewater reclamation rate height (can reach 75%-80%), running cost are low.。
Technical scheme of the present invention is: a kind of membrane separation process of lead-zinc smelting wastewater, this processing step: the lead-zinc smelting trade effluent (promptly is mainly heavy metal index: Pb≤1.0mg/L through the heavy metal precipitation art breading is up to standard, Zn≤3.0mg/L, Cd≤0.1mg/L, turbidity is 6~10NTU (nephelometric turbidity unit)) after, waste water regulated to the suitable working temperature (25 ℃~35 ℃) of membrane process through cooling infrastructure.Cooled waste water is promoted by pump and regulates pH to 6.5~7.5 through the pH varitrol, enters the suspended substance in the more medium filter removal water afterwards, and the turbidity that reduces water satisfies the ultrafiltration water inlet and requires (turbidity is less than 1.0NTU (nephelometric turbidity unit)).The more medium filter water outlet directly enters ultra-filtration equipment, remove materials such as suspended substance, colloid, virus in the water, water quality reaches the nanofiltration water inlet and requires (to be mainly SDI (alluvial index)<3.0, turbidity is less than 0.10) promote by pump afterwards and enter nanofiltration device again through security personnel's strainer and separate, be i.e. desalting treatment.Nanofiltration membrane technology producing water ratio is 75%~80%., average rejection is produced water water quality and is better than the industrial circulating water water quality standard 92%~95%, can be back to industrial cycle water system or water quality requirement high use water spot.But standard discharge after the concentrated solution process enhanced coagulation technical finesse of membrane separation process generation 20%~25%, promptly regulate concentrated solution pH to 10.5~11.5 by alkali, and (dosage is that (dosage is 10~20mg/L) for 300mg/L~500mg/L) and polyacrylamide to add excessive bodied ferric sulfate, separate through enhanced coagulation reaction postprecipitation, supernatant liquor is standard discharge behind acid for adjusting pH, carries out " water pollutant emission limit " (DB44/26-2001) the highest permission emission concentration of first kind pollutent and second pollutant, first period secondary standard.
The invention has the advantages that: adopt membrane process that the lead-zinc smelting wastewater Treatment for Reuse is had waste water reclamation rate height, the characteristics that reuse water quality is good.Water quality characteristics at waste water, adopt novel membrane separation process based on nanofiltration, utilize nanofiltration membrane to one, the characteristics of the different rejection of valency ionic, technology can guarantee backwater water quality (average rejection is 92%~95%), reduce the fouling tendency and the film intake pressure (with respect to the low approximately 0.4Mpa of traditional reverse osmosis process) of film system simultaneously, reach the purpose that reduces technology running cost.This technology nanofiltration membrane has a cleaning interval and grows (2~3 months), the characteristics of yearly depreciation low (below 20%).But the concentrated solution stably reaching standard that adopts the enhanced coagulation technological processing craft to produce effluxes, and technology is economically feasible simply again.Membrane separation process level of automation height, manual operation is easy.
Description of drawings
Accompanying drawing is the membrane separation process schema of lead-zinc smelting wastewater of the present invention.
Embodiment
A kind of membrane separation process of lead-zinc smelting wastewater, this technology adopts heavy metal precipitation art breading back up to standard majority to efflux at the trade effluent of domestic main lead-zinc smelting enterprise, the present situation that reclamation rate is low and water quality is relatively poor, engineering after the consideration technological invention is used and is promoted, membrane process adopts the pretreatment mode of " heavy metal precipitation technology+cooling system+more medium filter+ultrafiltration ", and main process adopts " nanofiltration " technology.
See accompanying drawing 1, embodiment is as follows by technical process:
It is up to standard that lead-zinc smelting wastewater at first passes through the heavy metal precipitation art breading: waste water is introduced into one section mixed reaction pond, regulate wastewater pH to 10.5~11 by adding milk of lime, heavy metal in the waste water (being mainly Cd, Zn) forms the insoluble metal hydroxides, enters one section thickening pond afterwards and carries out solid-liquid separation.Supernatant liquor enters two sections mixed reaction ponds, by adding bodied ferric sulfate and utilizing sulfuric acid to regulate pH to 9.0~9.5, form insoluble metal hydroxides (being mainly Pb) in the waste water and flocculation reaction takes place and form flco, enter two sections thickening pond afterwards and carry out solid-liquid separation, supernatant liquor enters pH and adjusts adjusting pH to 7.5~8.0, pond, and waste water enters cooling infrastructure.
Waste water by cooling infrastructure after temperature be controlled at 25 ℃~35 ℃, guarantee film system intake pressure and membrane flux preferably.Cooled waste water is earlier by the little adjust pH to 6.5 of automatic acid adjustment~7.5, and add the biological pollution that oxygenant suppresses the film system, enter the suspended substance in the more medium filter removal water afterwards, the turbidity that reduces water is to satisfy the ultrafiltration water inlet, entering ultrafiltration technology afterwards to remove materials such as suspended substance, colloid, virus in the water. the ultrafiltration water outlet enters the raw water box of nanofiltration technique, after raw water box ultrafiltration product water adds an amount of reductive agent and Scale inhibitors, carry out desalting treatment by entering the nanofiltration membrane device behind the nanofiltration technique security personnel strainer.Produce the water reuse, concentrated solution enters the enhanced coagulation art breading.
The enhanced coagulation art breading is as follows: concentrated solution is introduced into mixing pit, and adds milk of lime adjusting pH value, adds bodied ferric sulfate and forms flco, enters reaction tank afterwards and add polyacrylamide to strengthen coagulation effect.Waste water enters inclined-plate clarifying basin again and carries out solid-liquid separation, and supernatant liquor is transferred pH to 7~8 back qualified discharges.

Claims (1)

1. the membrane separation process of a lead-zinc smelting wastewater, this processing step: the lead-zinc smelting trade effluent is regulated waste water to 25 ℃~35 ℃ of membrane process working temperatures through cooling infrastructure after reaching emission standard through the heavy metal precipitation art breading; Cooled waste water is promoted by pump and regulates pH to 6.5~7.5 through the pH varitrol, enters the suspended substance in the more medium filter removal water afterwards, and the turbidity that reduces water is less than 1.0NTU; The more medium filter water outlet directly enters ultra-filtration equipment, remove suspended substance, colloid, virus in the water, water quality reaches the nanofiltration water inlet and requires SDI<3.0, and turbidity is less than 0.10, enter nanofiltration device by the pump lifting again through security personnel's strainer afterwards and separate, be i.e. desalting treatment; Nanofiltration membrane technology producing water ratio is 75%~80%, average rejection is 92%~95%, produce water water quality and be better than the industrial circulating water water quality standard, can be back to industrial cycle water system or water quality requirement high use water spot, but standard discharge after the concentrated solution process enhanced coagulation technical finesse of membrane separation process generation 20%~25%, promptly regulate concentrated solution pH to 10.5~11.5 by alkali, and adding bodied ferric sulfate and polyacrylamide, the bodied ferric sulfate dosage is 300mg/L~500mg/L, the polyacrylamide dosage is at 10~20mg/L, separate through enhanced coagulation reaction postprecipitation, supernatant liquor is standard discharge behind acid for adjusting pH.
CN2009101150005A 2009-03-05 2009-03-05 Membrane separation process for lead-zinc smelting wastewater Active CN101492214B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009101150005A CN101492214B (en) 2009-03-05 2009-03-05 Membrane separation process for lead-zinc smelting wastewater

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Application Number Priority Date Filing Date Title
CN2009101150005A CN101492214B (en) 2009-03-05 2009-03-05 Membrane separation process for lead-zinc smelting wastewater

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CN101492214A CN101492214A (en) 2009-07-29
CN101492214B true CN101492214B (en) 2011-02-02

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102320706A (en) * 2011-07-08 2012-01-18 上海希沃环境科技有限公司 System for deep recovery and treatment of coking wastewater biochemical effluent
CN102603097B (en) * 2012-03-23 2014-03-19 郑州鸿跃环保科技有限公司 Advanced treatment and recycling process for wastewater containing heavy metal ions
CN104787927B (en) * 2015-04-16 2016-08-31 株洲冶炼集团股份有限公司 A kind of lead-zinc smelting flue gas washing acid water purifies reuse method
CN105236624A (en) * 2015-10-30 2016-01-13 南京德邦金属装备工程股份有限公司 Recycling method for zinc-containing wastewater by membrane treatment
CN110330162A (en) * 2019-07-25 2019-10-15 深圳市中金岭南有色金属股份有限公司 A kind of lead-zinc smelting wastewater processing system and its processing method
CN110616333A (en) * 2019-10-28 2019-12-27 中国恩菲工程技术有限公司 Method for treating zinc-containing waste liquid

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Address after: 330031 No. 888, Qian Hu Road, Hongjiao Island, Nanchang, Jiangxi.

Co-patentee after: Shaoguan Smelter, Shenzhen Zhongjin Lingnan Nonfemet Co., Ltd.

Patentee after: China ruim engineering technology Limited by Share Ltd

Address before: No. 1, Bayi Avenue, Nanchang, Jiangxi Province, Jiangxi

Co-patentee before: Shaoguan Smelter, Shenzhen Zhongjin Lingnan Nonfemet Co., Ltd.

Patentee before: China Nerin Engineering Co., Ltd.