CN1657448A - Recovering and using technology of water in electroplating - Google Patents
Recovering and using technology of water in electroplating Download PDFInfo
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- CN1657448A CN1657448A CN 200410089237 CN200410089237A CN1657448A CN 1657448 A CN1657448 A CN 1657448A CN 200410089237 CN200410089237 CN 200410089237 CN 200410089237 A CN200410089237 A CN 200410089237A CN 1657448 A CN1657448 A CN 1657448A
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- water
- neutralization
- rinse water
- reverse osmosis
- metal ion
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Abstract
A process for reusing the reclaimed electroplating sewage includes such steps as decomposing cyanide, reducing, filtering twice, pressurizing, reverse osmosis, neutralizing the RO water, neutralizing concentrated water, and depositing.
Description
Technical field
The invention belongs to a kind of sewage recovery and utilization technology, particularly relate to a kind of electroplating sewerage recovery and utilization technology.
Background technology
As if for a long time, people think that water is inexhaustible, although also know the preciousness of water, since be inexhaustible, so also just be not worth, be unworthy treasuring.Over nearly 50 years, people just begin to recognize the poorness of earth water resources, to the degree that can not be ignored.China is the country of a shortage of water resources, and the urban water shortage problem is particularly outstanding.Along with Economic development and quickening of urbanization process, current considerable part city serious water shortage.This arid in several years more demonstrates the extreme importance and the urgency that solve the municipal water problem, and it is directly connected to the people's life, is related to social stability, is related to the Sustainable development in city.In national economy and social development 10th Five-Year Plan outline, " waste water treating and reutilizing " clearly write outline for the first time.In fact water is unique irreplaceable at occurring in nature, also be unique can the regenerated resource.Sewage can reuse through suitable manipulation of regeneration, realizes the optimum systemic circulation of water at occurring in nature.At electroplating industry, sewage disposal technology in the past all is purpose with the qualified discharge, as add the pyrosulphite sodium reduction in containing the chromium rinse water, then with calcium oxide neutralization, post precipitation qualified discharge.The fresh water consumption is≤0.4T/M in electroplating industry cleaner production requirement (comprehensively electroplating class) utilization of resources index
2Be requirement that reaches cleaner production and the comprehensive utilization that realizes resource, correlative study mechanism actively develops " plating technology of middle water recycle " research, but it is all under test basically, as filtering by the water that reaches emission standard after the above-mentioned processing, carry out reverse-osmosis treated then, but oxyhydroxide that N-process generates and calcium sulfate etc. can not precipitate fully and remove in filtration procedure, in this concentration process of reverse osmosis, certainly will supersaturation separate out, thereby the dirt that causes reverse osmosis membrane is stifled, cause membrane flux and ratio of desalinization to descend, shortened the work-ing life of film, increased the cost of reuse water.
Summary of the invention
The present invention is directed to the deficiency that above-mentioned prior art exists, proposed a kind of plating technology of middle water recycle, this technical matters process engineering rationally, overcome the dirty stifled problem of reverse osmosis membrane, reduce the reuse water comprehensive cost.
Technical scheme of the present invention is: a kind of plating technology of middle water recycle, reverse osmosis step is arranged in before the neutralization procedure, and comprise broken cyanide, reduction, once filtration, secondary filtration, pressurization, reverse osmosis, the neutralization of RO water and neutralization of dense water and settling step:
(1) broken cyanide: in containing the cyanogen rinse water, add an amount of clorox, with destructions-CN and the formed complex status of metal ion, make hypertoxic-CN is oxidized, metal ion is unbound state; Usually, the addition of clorox is-7 times of CN by weight.
(2) reduction: contain the chromium rinse water and add an amount of Sodium Pyrosulfite and sulfuric acid, with Cr wherein
6+Be reduced into Cr
3+Usually, the addition of Sodium Pyrosulfite is Cr by weight
6+3.5 times.
(3) once filter: will comprise contain the cyanogen rinse water through broken cyanide, contain the chromium rinse water and carry out coarse filtration through the comprehensive rinse water of reduction and other rinse water, promptly adopt laminated filter to filter to remove the wherein bigger impurity of particle.
(4) secondary filtration: the comprehensive rinse water after coarse filtration is carried out the essence filter again, to remove the wherein molecule more than 5 μ, generally adopts yarn core or PP candle filter to filter.
(5) pressurization:, make its pressure greater than osmotic pressure, so that can realize reverse osmosis process subsequently with the high-pressure pump pressurization.
(6) reverse osmosis: adopt neutral anti-pollution reverse osmosis membrane desalination, produce RO water, metal ion and other impurity are trapped within the dense water.
(7) RO water neutralization: the pH value with sodium hydroxide adjustment RO water, make it to reach the requirement of reuse, alternative tap water is back to the plating cleaning process.
(8) dense water neutralization: with the calcium oxide neutralization, regulate its acidity, make metal ion wherein generate oxyhydroxide, SO simultaneously with-OH
4 2-With Ca
2+Generate calcium sulfate.
(9) precipitation: in the dense water and after enter tube settler, make oxyhydroxide that N-process generates and calcium sulfate etc. precipitated, the supernatant liquor qualified discharge, throw out enters sludge sump.
The present invention is arranged in reverse osmosis step before the neutralization procedure, solved the prior art reverse osmosis step the neutralization after, in and the time CaSO that generates
4, Ca (OH)
2, Ni (OH)
2, Cr (OH)
3, Cu (OH)
2Thereby cause that reverse osmosis membrane is dirty stifled Deng can not in precipitation and filtration procedure, removing fully, cause the problem of membrane flux and ratio of desalinization decline, the work-ing life of having improved film; And save the Scale inhibitors that adds because of antiscale, in having reduced and the addition of medicament, dwindled the equipment scale of settling system, so greatly reduce the comprehensive cost of reuse water.And, because H
+Specific conductivity be much higher than Na
+, with sodium hydroxide quantitatively in and significantly reduced the reuse electrical conductivity of water during reuse water.Use the technology of the present invention and handle electroplating integrated rinse water, ratio of desalinization can reach more than 90%, when the water inlet specific conductivity is 3000 μ～5000 μ, pH=2.5～5 o'clock, reuse electrical conductivity of water≤500 μ, pH=6～8, ratio of desalinization reaches 90%～98%, and the recovery utilization rate of water is 60%～75%.
Description of drawings
Accompanying drawing is the process flow diagram of one embodiment of the present invention.
Embodiment
Embodiment 1
As shown in drawings, contain in the cyanogen rinse water 7 times the clorox that adds by weight to-CN, with destruction-CN and the formed complex status of metal ion, make-CN is oxidized, and metal ion is unbound state; Contain to add in the chromium rinse water and be Cr by weight
6+3.5 times Sodium Pyrosulfite, PH is transferred to 2.5 Cr that make wherein
6+Be reduced into Cr
3+Then with contain that other rinse water such as acid, alkali, copper, nickel are mixed to be comprehensive rinse water.Adopt the superposing type strainer to remove the wherein bigger impurity of particle earlier; Then adopt the yarn core strainer to remove by filter the wherein above molecule of 5 μ; With the high-pressure pump pressurization, make its pressure again, enter reverse-osmosis treated greater than osmotic pressure; Reverse-osmosis treated adopts neutral resistant to pollution reverse osmosis membrane, removes metal ion wherein, produces RO water; With sodium hydroxide the pH value of RO water is adjusted to neutrality at last, is reuse water.After tested, its specific conductivity is 85 μ, and ratio of desalinization is 90%.This reuse water is used to electroplate in the cleaning process, can substitute the cleaning tap water.As calculated, the recovery utilization rate of water is 68%.
To the dense water that reverse-osmosis treated produces, adopt the calcium oxide neutralization, regulate that it is acid near neutral, make metal ion wherein generate oxyhydroxide, SO simultaneously with-OH
4 2-With Ca
2+Generate calcium sulfate; Through oxyhydroxide and the calcium sulfate precipitation that tube settler generates N-process, supernatant liquor is the back qualified discharge after tested, and throw out then enters sludge sump.
Embodiment 2
As shown in drawings, adding in containing the chromium rinse water is Cr by weight
6+3.5 times Sodium Pyrosulfite, with Cr wherein
6+Be reduced into Cr
3+Adopt laminated filter to filter then to remove the wherein bigger impurity of particle; Then adopt the PP candle filter to remove by filter the wherein above molecule of 5 μ; With the high-pressure pump pressurization, make its pressure greater than osmotic pressure again, enter reverse-osmosis treated, reverse-osmosis treated adopts neutral resistant to pollution reverse osmosis membrane, removes metal ion wherein, produces RO water; With sodium hydroxide the pH value of RO water is adjusted to 6.8 at last, is reuse water.After tested, its specific conductivity is 125 μ, and ratio of desalinization reaches 95%.This reuse water is used to electroplate in the cleaning process, can substitute the cleaning tap water.As calculated, the recovery utilization rate of water is 72%.
To the dense water that reverse-osmosis treated produces, adopt the calcium oxide neutralization, regulate that it is acid near neutral, make metal ion wherein generate oxyhydroxide, SO simultaneously with-OH
4 2-With Ca
2+Generate calcium sulfate; Through oxyhydroxide and the calcium sulfate precipitation that tube settler generates N-process, supernatant liquor is the back qualified discharge after tested, and throw out then enters sludge sump.
Claims (2)
1. electroplate technology of middle water recycle for one kind, comprise reduction, neutralization, precipitation, filtration, pressurization and reverse osmosis step, it is characterized in that wherein reverse osmosis step is arranged in before the neutralization procedure, its processing step is as follows:
(1) broken cyanide: add an amount of clorox in containing the cyanogen rinse water, with destruction-CN and the formed complex status of metal ion, make severe toxicity-CN oxidized, metal ion is unbound state;
(2) reduction: contain the chromium rinse water and add an amount of Sodium Pyrosulfite, with Cr wherein
6+Be reduced into Cr
3+
(3) once filter: will comprise contain the cyanogen rinse water through broken cyanide, contain the chromium rinse water and carry out coarse filtration, to remove the wherein bigger impurity of particle through the comprehensive rinse water of reduction and other rinse water;
(4) secondary filtration: the comprehensive rinse water after coarse filtration is carried out the essence filter again, to remove the wherein molecule more than 5 μ;
(5) pressurization:, make its pressure greater than osmotic pressure with the high-pressure pump pressurization;
(6) reverse osmosis: adopt neutral anti-pollution reverse osmosis membrane desalination, produce RO water, metal ion and other impurity are trapped within the dense water;
(7) RO water neutralization: the pH value with sodium hydroxide adjustment RO water, reach the requirement of reuse, alternative tap water is back to the plating cleaning process;
(8) dense water neutralization: with the calcium oxide neutralization, regulate its acidity, make metal ion wherein generate oxyhydroxide, SO simultaneously with-OH
4 2-With Ca
2+Generate calcium sulfate;
(9) precipitation: in the dense water and after enter settling tank, oxyhydroxide and calcium sulfate that N-process generates are precipitated, the supernatant liquor qualified discharge, throw out enters sludge sump.
2. a kind of plating technology of middle water recycle as claimed in claim 1 is characterized in that a filtration step adopts laminated filter to filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410089237 CN1282616C (en) | 2004-12-04 | 2004-12-04 | Recovering and using technology of water in electroplating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410089237 CN1282616C (en) | 2004-12-04 | 2004-12-04 | Recovering and using technology of water in electroplating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1657448A true CN1657448A (en) | 2005-08-24 |
| CN1282616C CN1282616C (en) | 2006-11-01 |
Family
ID=35007182
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410089237 Expired - Fee Related CN1282616C (en) | 2004-12-04 | 2004-12-04 | Recovering and using technology of water in electroplating |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323957C (en) * | 2005-10-17 | 2007-07-04 | 海宁市海整整流器有限公司 | Electrosilvering cleaning water comprehensive utilization |
| CN100364905C (en) * | 2006-02-09 | 2008-01-30 | 同济大学 | Method for recovering chromium from iron and steel plant waste water and sludge, and its resource utilization method |
| CN100386475C (en) * | 2005-10-17 | 2008-05-07 | 海宁市海整整流器有限公司 | Water comprehensive utilization technology for cleaning electroplating nickel |
| CN101705515A (en) * | 2009-11-17 | 2010-05-12 | 厦门启和电器有限公司 | Reverse osmosis terminal rinsing method for plating part |
| CN101817608A (en) * | 2010-04-02 | 2010-09-01 | 厦门百仕洁环保科技有限公司 | Two-stage treatment method for heavy metal wastewater |
| CN101353208B (en) * | 2007-07-26 | 2010-09-29 | 厦门溢盛环保科技有限公司 | Reclaiming process for electroplating cyanic waste water and equipment thereof |
| CN101481157B (en) * | 2008-01-17 | 2010-12-08 | 刘寅 | Process for advanced treatment of electroplating waste by integrated membrane |
| CN101234828B (en) * | 2008-02-19 | 2011-05-11 | 天津大学 | Integrated electroplating treatment method for waste water |
| CN102459096A (en) * | 2009-06-11 | 2012-05-16 | 栗田工业株式会社 | Method for recovering water and metals from plating wastewater resulting from washing |
| CN101641294B (en) * | 2006-11-06 | 2013-04-10 | 威立雅水务解决方案与技术支持联合股份公司 | Membrane station waste treatment process |
| CN104326599A (en) * | 2014-10-25 | 2015-02-04 | 吴长江 | Treatment method and treatment device of cyanogen-containing chromium-containing electroplating wastewater |
| CN104386850A (en) * | 2014-10-20 | 2015-03-04 | 厦门百仕洁环保科技有限公司 | Treatment method for simultaneously removing hexavalent chromium and cyanide in electroplating wastewater |
| CN104649468A (en) * | 2014-11-06 | 2015-05-27 | 东莞汇金环境科技有限公司 | Emission treatment system for high-concentration nickel chloride produced during electroplating |
| CN104891704A (en) * | 2015-05-05 | 2015-09-09 | 岳嵩 | High-salt content waste water treatment method |
| CN106698750A (en) * | 2016-12-28 | 2017-05-24 | 上海丰信环保科技有限公司 | Electroplating wastewater reclaimed water recycling process and system |
| CN108164088A (en) * | 2017-12-28 | 2018-06-15 | 靖江市华晟重金属防控有限公司 | One kind can not recycling electroplating wastewater treatment method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100443423C (en) * | 2007-04-27 | 2008-12-17 | 济南晶恒有限责任公司 | Electroplating wastewater treatment reclaiming technique |
-
2004
- 2004-12-04 CN CN 200410089237 patent/CN1282616C/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100386475C (en) * | 2005-10-17 | 2008-05-07 | 海宁市海整整流器有限公司 | Water comprehensive utilization technology for cleaning electroplating nickel |
| CN1323957C (en) * | 2005-10-17 | 2007-07-04 | 海宁市海整整流器有限公司 | Electrosilvering cleaning water comprehensive utilization |
| CN100364905C (en) * | 2006-02-09 | 2008-01-30 | 同济大学 | Method for recovering chromium from iron and steel plant waste water and sludge, and its resource utilization method |
| CN101641294B (en) * | 2006-11-06 | 2013-04-10 | 威立雅水务解决方案与技术支持联合股份公司 | Membrane station waste treatment process |
| CN101353208B (en) * | 2007-07-26 | 2010-09-29 | 厦门溢盛环保科技有限公司 | Reclaiming process for electroplating cyanic waste water and equipment thereof |
| CN101481157B (en) * | 2008-01-17 | 2010-12-08 | 刘寅 | Process for advanced treatment of electroplating waste by integrated membrane |
| CN101234828B (en) * | 2008-02-19 | 2011-05-11 | 天津大学 | Integrated electroplating treatment method for waste water |
| CN102459096A (en) * | 2009-06-11 | 2012-05-16 | 栗田工业株式会社 | Method for recovering water and metals from plating wastewater resulting from washing |
| CN101705515A (en) * | 2009-11-17 | 2010-05-12 | 厦门启和电器有限公司 | Reverse osmosis terminal rinsing method for plating part |
| CN101705515B (en) * | 2009-11-17 | 2012-09-26 | 厦门启和电器有限公司 | Reverse osmosis terminal rinsing method for plating part |
| CN101817608A (en) * | 2010-04-02 | 2010-09-01 | 厦门百仕洁环保科技有限公司 | Two-stage treatment method for heavy metal wastewater |
| CN104386850A (en) * | 2014-10-20 | 2015-03-04 | 厦门百仕洁环保科技有限公司 | Treatment method for simultaneously removing hexavalent chromium and cyanide in electroplating wastewater |
| CN104386850B (en) * | 2014-10-20 | 2016-11-16 | 厦门百仕洁环保科技有限公司 | Cr VI and the processing method of cyanide in a kind of electroplating wastewater of removal simultaneously |
| CN104326599A (en) * | 2014-10-25 | 2015-02-04 | 吴长江 | Treatment method and treatment device of cyanogen-containing chromium-containing electroplating wastewater |
| CN104649468A (en) * | 2014-11-06 | 2015-05-27 | 东莞汇金环境科技有限公司 | Emission treatment system for high-concentration nickel chloride produced during electroplating |
| CN104891704A (en) * | 2015-05-05 | 2015-09-09 | 岳嵩 | High-salt content waste water treatment method |
| CN106698750A (en) * | 2016-12-28 | 2017-05-24 | 上海丰信环保科技有限公司 | Electroplating wastewater reclaimed water recycling process and system |
| CN108164088A (en) * | 2017-12-28 | 2018-06-15 | 靖江市华晟重金属防控有限公司 | One kind can not recycling electroplating wastewater treatment method |
Also Published As
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|---|---|
| CN1282616C (en) | 2006-11-01 |
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