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Treatment of electroplating wastewater

2000

Dear Sir,

As a part of my project on industrial wastes I visited a local electroplating plant in England. They are using Alkaline -Non Cyanide zinc plating followed by Chrome plating for a better finish. |The treatment of the effluent water is as follows:After precipitating and reducing hexavalent chromium to trivalent state by adding sodium metabisulphate ,and mixing it with the pH neutralised rinse water from alkaline non cyanide solution ,they settle the precipitates in a tank ,take the sludge to the presses and the remaining water they take to a sand filtration tank . I would like to know whether sand filtration is used anywhere for this kind of a treatment and if it is an efficient and cost effective treatment.

Regards

Anusha Shah
nil - UK

Yes, this is a fairly common treatment strategy.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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2000

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