plating, anodizing, & finishing Q&As since 1989
Treatment of electroplating wastewater
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.
nil - UK
Yes, this is a fairly common treatment strategy.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey