CN103130348A - Whole membrane treatment method of electroplating chromeplating waste water - Google Patents
Whole membrane treatment method of electroplating chromeplating waste water Download PDFInfo
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- CN103130348A CN103130348A CN2011103048954A CN201110304895A CN103130348A CN 103130348 A CN103130348 A CN 103130348A CN 2011103048954 A CN2011103048954 A CN 2011103048954A CN 201110304895 A CN201110304895 A CN 201110304895A CN 103130348 A CN103130348 A CN 103130348A
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Abstract
A whole membrane treatment method of electroplating chrome plating waste water comprises the following treatment steps of: 1) rinsing: rinsing electroplating chromeplated parts with clear water in a rinsing tank after being electroplated through a chromeplating electrophoresis liquid tank to obtain rinsed liquid; (2) sand filtration: treating the rinsed liquid in the rinsing tank by a sand filtration tank to remove suspension, colloid, flocculate, mud sand, rust, and the like to obtain sand-filtered liquid; (3) hollow fiber ultrafiltration membrane treatment; (4) reverse osmosis treatment: performing reverse osmosis concentration treatment of the clear liquid by a reverse osmosis device; (5) cyclic operation of the above steps. The method has the advantages that the problem of secondary pollution caused by traditional chemical precipitation methods is solved; the problem of membrane oxidation and degradation due to hexavalent chromium ions is solved; the method meets the new discharge national standard; the whole process flow operation is simple and convenient; waste water in the whole process is in a recycle state, and is not discharged to the outside at all; and the whole process reaches the standard of zero discharge.
Description
Technical field:
The present invention relates to field of waste water treatment, be specifically related to the full membrane treating method of a kind of plating chromium plating wastewater.
Background technology:
at present in the Industrial Wastewater Treatment field, particularly in the processing of electroplating wastewater, main method or the chemical precipitation method that adopts, water after it is processed also will carry out the emission standard that wastewater treatment just can reach the new one-level of country again, nickel in plating, although the electroplating wastewaters such as copper also have the technique that begins to adopt the embrane method processing, but the chemical factor restriction due to the strong oxidizing property of chromium, embrane method is processed chromium plating wastewater and is restricted always, be difficult to solve chemical precipitation method and process the secondary pollution problems of bringing, and hexavalent chromium is to the problem of film oxidative degradation, can not reach desirable zero release standard, environment there is certain negative impact.
Summary of the invention:
The invention provides the full membrane treating method of a kind of plating chromium plating wastewater, under the long-term operation of this technical process, in the first-stage reverse osmosis membrane module, concentrated hexavalent chromium can reach the content of chromium ion swimming liquid standard, can reach ion fully and be restored to the standard that the swimming liquid bath recycles, solve traditional chemical precipitation method and processed the secondary pollution problems of bringing, secondly also solved the problem of hexavalent chromium to film oxidative degradation, can reach desirable zero release standard fully, satisfy the emission standard of national new one-level.
In order to solve the existing problem of background technology, the present invention is by the following technical solutions: the full membrane treating method of a kind of plating chromium plating wastewater, and treatment step is:
(1) rinsing: the part of electroplating chromium plating enters rinse tank and carries out the clear water rinsing after the swimming liquid bath of chromium plating is electroplated, obtain rinsing liquid;
(2) sand filtration: the rinsing liquid in rinse tank is processed through sandfiltration pot, removes the materials such as suspended substance, colloid, flocculation in the rinsing liquid that contains chromium carried, silt, iron rust, obtains sand filtration night;
(3) hollow fiber ultrafiltration membrane is processed: the hollow fiber film assembly that sand filtration is entered 90*1000mm night, in temperature≤60 ℃, pressure is removed macromolecular colloid, protein, microorganism and the larger molecular organics matter of the inside under the working conditions of≤6bar, obtain clear liquid;
(4) reverse-osmosis treated: with reverse osmosis equipment, clear liquid is carried out reverse osmosis concentrated liquid and process, concrete steps are as follows:
1. clear liquid is carried out the first-stage reverse osmosis membrane module and process, and at pressure≤35bar, process under the condition of temperature≤40 ℃, all hexavalent chromiums are all at concentration side, and clear liquid is in the water side,
2. the clear liquid of water side continues to enter into the two-pass reverse osmosis membrane module, at pressure≤35bar, carries out reconcentration under the condition of temperature≤40 ℃,
3. more a fraction of hexavalent chromium is carried out reconcentration, makes the two-pass reverse osmosis film go out electrical conductivity of water and be controlled at below national heavy metal claimed range, and can return to fully in the plating rinse tank of wiring back and recycle,
4. also contain the hexavalent chromium of trace in the concentrated solution of two-pass reverse osmosis film, it is restored in the first-stage reverse osmosis membrane module it is processed again;
(5) the above step of cyclical operation gets final product.
Quartz sand, gac are equipped with in sandfiltration pot inside described in step (2).
The working environment parameter of described sandfiltration pot is: working temperature is at 5～60 ℃, operating pressure≤0.6Mpa, and water feeding pressure 〉=0.04MPa, back flushing water feeding pressure 〉=0.15MPa, inlet outlet pressure differential is at 0.01～0.015Mpa.
The present invention has following beneficial effect: under long-term operation, in the first-stage reverse osmosis membrane module, concentrated hexavalent chromium can reach the content of chromium ion swimming liquid standard, can reach ion fully and be restored to the standard that the swimming liquid bath recycles, solve traditional chemical precipitation method and processed the secondary pollution problems of bringing, secondly also solve the problem of hexavalent chromium to film oxidative degradation, satisfied the emission standard of national new one-level; Whole technical process is simple, convenient, and in whole technique, waste water is all the state that is in recycle, is not discharged into fully in the external world, and whole technique can reach the standard of zero release.
Description of drawings:
Fig. 1 is process flow sheet of the present invention.
Embodiment:
Embodiment: China Electronic Science and Technology Corporation Hefei City, Anhui Province the 38 institute's electroplating wastewater project; Project takes to electroplate the full membrane treating method of chromium plating wastewater, in conjunction with a cover tubular fibre film device, one cover first-stage reverse osmosis concentrated film device and a cover two-pass reverse osmosis concentrated film device, all are stable for the whole system internal operation, effluent index still satisfies the user so far for the requirement of water outlet lower than the specific conductivity of municipal tap water, whole rinse water and hexavalent chromium circulate in internal system always, do not give off outside system, satisfied the requirement of full embrane method zero release, whole technique concrete operation step is as follows:
(1) rinsing: the part of electroplating chromium plating enters rinse tank and carries out the clear water rinsing after the swimming liquid bath of chromium plating is electroplated, obtain rinsing liquid;
(2) sand filtration: the rinsing liquid in rinse tank is processed through sandfiltration pot, removes the materials such as suspended substance, colloid, flocculation in the rinsing liquid that contains chromium carried, silt, iron rust, obtains sand filtration night;
(3) hollow fiber ultrafiltration membrane is processed: the hollow fiber film assembly that sand filtration is entered 90*1000mm night, in temperature≤60 ℃, pressure is removed macromolecular colloid, protein, microorganism and the larger molecular organics matter of the inside under the working conditions of≤6bar, obtain clear liquid;
(4) reverse-osmosis treated: with reverse osmosis equipment, clear liquid is carried out reverse osmosis concentrated liquid and process, concrete steps are as follows:
1. clear liquid is carried out the first-stage reverse osmosis membrane module and process, and at pressure≤35bar, process under the condition of temperature≤40 ℃, all hexavalent chromiums are all at concentration side, and clear liquid is in the water side,
2. the clear liquid of water side continues to enter into the two-pass reverse osmosis membrane module, at pressure≤35bar, carries out reconcentration under the condition of temperature≤40 ℃,
3. more a fraction of hexavalent chromium is carried out reconcentration, makes the two-pass reverse osmosis film go out electrical conductivity of water and be controlled at below national heavy metal claimed range, and can return to fully in the plating rinse tank of wiring back and recycle,
4. also contain the hexavalent chromium of trace in the concentrated solution of two-pass reverse osmosis film, it is restored in the first-stage reverse osmosis membrane module it is processed again;
(5) the above step of cyclical operation gets final product.
Quartz sand, gac are equipped with in sandfiltration pot inside described in step (2).
The working environment parameter of described sandfiltration pot is: working temperature is at 5～60 ℃, operating pressure≤0.6Mpa, and water feeding pressure 〉=0.04MPa, back flushing water feeding pressure 〉=0.15MPa, inlet outlet pressure differential is at 0.01～0.015Mpa.
Claims (3)
1. electroplate the full membrane treating method of chromium plating wastewater for one kind, it is characterized in that: treatment step is:
(1) rinsing: the part of electroplating chromium plating enters rinse tank and carries out the clear water rinsing after the swimming liquid bath of chromium plating is electroplated, obtain rinsing liquid;
(2) sand filtration: the rinsing liquid in rinse tank is processed through sandfiltration pot, removes the materials such as suspended substance, colloid, flocculation in the rinsing liquid that contains chromium carried, silt, iron rust, obtains sand filtration night;
(3) hollow fiber ultrafiltration membrane is processed: the hollow fiber film assembly that sand filtration liquid is entered 90*1000mm, in temperature≤60 ℃, pressure is removed macromolecular colloid, protein, microorganism and the larger molecular organics matter of the inside under the working conditions of≤6bar, obtain clear liquid;
(4) reverse-osmosis treated: with reverse osmosis equipment, clear liquid is carried out reverse osmosis concentrated liquid and process, concrete steps are as follows:
1. clear liquid is carried out the first-stage reverse osmosis membrane module and process, and at pressure≤35bar, process under the condition of temperature≤40 ℃, all hexavalent chromiums are all at concentration side, and clear liquid is in the water side,
2. the clear liquid of water side continues to enter into the two-pass reverse osmosis membrane module, at pressure≤35bar, carries out reconcentration under the condition of temperature≤40 ℃,
3. more a fraction of hexavalent chromium is carried out reconcentration, makes the two-pass reverse osmosis film go out electrical conductivity of water and be controlled at below national heavy metal claimed range, and can return to fully in the plating rinse tank of wiring back and recycle,
4. also contain the hexavalent chromium of trace in the concentrated solution of two-pass reverse osmosis film, it is restored in the first-stage reverse osmosis membrane module it is processed again;
(5) the above step of cyclical operation.
2. the full membrane treating method of a kind of plating chromium plating wastewater as claimed in claim 1 is characterized in that: quartz sand, gac are equipped with in the sandfiltration pot inside described in step (2).
3. the full membrane treating method of a kind of plating chromium plating wastewater as claimed in claim 1, it is characterized in that: the working environment parameter of described sandfiltration pot is: working temperature is at 5～60 ℃, operating pressure≤0.6Mpa, water feeding pressure 〉=0.04MPa, back flushing water feeding pressure 〉=0.15MPa, inlet outlet pressure differential is at 0.01～0.015Mpa.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103435174A (en) * | 2013-09-04 | 2013-12-11 | 汉特（清远）化工有限公司 | System and process for treating nickel-containing electroplating wastewater |
| CN104529035A (en) * | 2014-12-24 | 2015-04-22 | 北京桑德环境工程有限公司 | High-concentration organic wastewater zero-discharge treatment system and method |
| CN105481060A (en) * | 2016-01-25 | 2016-04-13 | 浙江瑞丰机械设备有限公司 | Electroplating rinse wastewater recycling device |
| WO2017197803A1 (en) * | 2016-05-18 | 2017-11-23 | 上海交通大学 | Method for in-line resource reclamation of plating rinsing wastewater |
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| CN103435174A (en) * | 2013-09-04 | 2013-12-11 | 汉特（清远）化工有限公司 | System and process for treating nickel-containing electroplating wastewater |
| CN104529035A (en) * | 2014-12-24 | 2015-04-22 | 北京桑德环境工程有限公司 | High-concentration organic wastewater zero-discharge treatment system and method |
| CN105481060A (en) * | 2016-01-25 | 2016-04-13 | 浙江瑞丰机械设备有限公司 | Electroplating rinse wastewater recycling device |
| WO2017197803A1 (en) * | 2016-05-18 | 2017-11-23 | 上海交通大学 | Method for in-line resource reclamation of plating rinsing wastewater |
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Effective date of registration: 20181207 Address after: 233010 Huayuan Commercial Building No.2, Yuhui District, Bengbu City, Anhui Province Patentee after: Bengbu Xinjue Intelligent Technology Co., Ltd. Address before: 230011 Dadian Industrial Park, Yaohai Industrial Zone, Hefei City, Anhui Province Patentee before: Hefei XinDa Membrae Technology Co., Ltd. |
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Effective date of registration: 20190417 Address after: Room 107, Building No. 28, Hexili, Xiba, Chaoyang District, Beijing Patentee after: Li Qiannan Address before: 233010 Huayuan Commercial Building No.2, Yuhui District, Bengbu City, Anhui Province Patentee before: Bengbu Xinjue Intelligent Technology Co., Ltd. |
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Effective date of registration: 20190604 Address after: 518118 Pinghuan Industrial Town Avenue, Ma Luan Street, Pingshan District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Liwei Plastic Hardware Products Co., Ltd. Address before: Room 107, Building No. 28, Hexili, Xiba, Chaoyang District, Beijing Patentee before: Li Qiannan |
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