Water and Wastewater.com Help Forums - plating wastewater treatment

nguyen kien YaBB Newbies Offline I love Water and Wastewater.com Posts: 7 Company or Organization: hincomjsc	plating wastewater treatment Apr 20^th, 2012, 1:32am Hi all, May be any one could tell me know, on the plating wastewater process, include hex chrome, cyanua, Ni; which one should be processed first and then? I hope every one can show me thank all
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nguyen kien YaBB Newbies Offline I love Water and Wastewater.com Posts: 7 Company or Organization: hincomjsc	Re: plating wastewater treatment Reply #1 - Apr 20^th, 2012, 5:03am Realy nobody knew?
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Jeff Naumann

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Re: plating wastewater treatment
Reply #2 - Apr 20^th, 2012, 7:37am

"Plating" is a very large number of individual processes. Which specific plating are you asking about? Is it "hexavalent chrome plating" of steel? If that is the case, if memory serves me, the steel is cleaned, rinsed, plating with copper, rinsed, plated with nickle, rinsed, then plated with hex chrome, and finally rinsed. I've probably left off a couple of steps. But, using Google should produce the correct process.

Of course, there is also probably some means to chrome plate using trivalent chrome. Then, there is a process for "black chrome" plating.

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Re: plating wastewater treatment
Reply #3 - Apr 20^th, 2012, 12:49pm

Plating discharges are generally more economically treated at the source, before other waste streams are added. Treating the combined wastewater stream would involve a far more complicated process which would involve treating the entire wastewater stream. For example, cyanide would require pH elevation and oxidation (don't do this before chromium reduction because the low pH would liberate deadly hydrogen cyanide gas. Hexavalent chromium would require low pH reduction and elevated pH for precipitation of trivalent chromium for solids removal and nickel would probably require an elevated pH for solids removal.

A system using demineralized water could be utilized to reduce the loss of plating chemicals (cost saving) and reuse of wasted chemicals while reducing the potential discharge of prohibited substances. An engineering study of localized treatment versus centralized treatment should be presented to management.

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nguyen kien YaBB Newbies Offline I love Water and Wastewater.com Posts: 7 Company or Organization: hincomjsc	Re: plating wastewater treatment Reply #4 - Apr 21^st, 2012, 4:06am I thank for your show very much base on your show, in my way, i understood that the haex chrome would be processed to trivalent chrome first at low pH, and then pH elevation io process cyanua to cyanate, last be precipitation at hight pH many thanks. nguyenkien
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Jeff Naumann God Member Offline I love Water and Wastewater.com Posts: 1133 Torrance, California Gender: Company or Organization: Jeff Naumann & Associates	Re: plating wastewater treatment Reply #5 - Apr 21^st, 2012, 10:42am These processes and the treatment of waste stream have the potential to be quite dangerous if you don't really know what you are doing. Here's some information: http://www.nmfrc.org/bluebook/toc6.htm
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nguyen kien YaBB Newbies Offline I love Water and Wastewater.com Posts: 7 Company or Organization: hincomjsc	Re: plating wastewater treatment Reply #6 - Apr 22^nd, 2012, 3:56am thank all again your help realy be useful to me. I think I will use it in my new treatment. I also hope take your help for other Best Regard
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Taoward Lee

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Re: plating wastewater treatment
Reply #7 - Apr 26^th, 2012, 9:47am

The best pollution control for electroplating is PREVENTION by source reduction.

This means implementing:
1) Choosing low pollution chemistries
2) Low chemical concentrations of the process solutions
3) Multiple rinses to include static rinse to recover dragout especially for heated solution.

Waste minimization and pollution control for electroplating requires a lot of experience and knowledge to be done well. Find a good consultant.

Taoward Lee

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jackboyz YaBB Newbies Offline I love Water and Wastewater.com Posts: 2 Gender: Company or Organization: waste control	Re: plating wastewater treatment Reply #8 - May 16^th, 2012, 2:07am In Hexavalent chromium plating chromium trioxide, as the main ingredient. It processed in following way. 1. activation bath 2. chromium bath 3. rinse 4. rinse _____________ Liquid destruction
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