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topic 4555

Treatment of electroplating waste


I am a postgraduate student of Water and Environmental Engineering at the University of Surrey. I have an assignment on the treatment of Electroplating wastes especially non-cyanide zinc plating waste and chrome waste and the subsequent recovery. I visited a plant at Slough and found that they are treating their waste by precipitating according to the waste i.e. they use sodium bisulphite if the waste is too acidic.Then after primary sedimentation they pass the water through a sand filter and then they discharge it.

I would like to know if there are any other cost effective and optimized systems ...i need to make a presentation , so I would appreciate if you could help me out with this

anusha s [last name deleted for privacy by Editor]
univ of surrey - England



There are books available on the treatment of electroplating waste, including "Operation and Maintenance of Surface Finishing Wastewater Treatment Systems" [link is to book info at Amazon] and Water and Waste Control For the Plating Shop". For a much briefer treatment of the subject, there is coverage in the Metal Finishing Guidebook, the "Products Finishing" Directory, and the Electroplating Engineering Handbook.

I'm glad that you actually had a chance to see a plating shop--that's vitally important--but I think you still need to do some studying. I believe that the sodium bisulphite was used to reduce the hexavalent chromium in the waste stream to trivalent, in preparation for precipitation.

Ted Mooney, Teds signature
Ted Mooney, P.E. RET
Pine Beach, New Jersey


Dear Mr. Mooney,

I am studying at Ege University, Chemical Engineering Department and I am a last grade student.My diploma project is about "Treatment of Electroplating Industry Wastewater Treatment". I could not find sufficient literature information yet and I want you to inform me about this subject, please. I exactly want some information about which contaminants are included in electroplating industry wastewaters and which treatment technologies are applied ? I am looking forward to hearing from you soon.

With best regards...

KEMAL T [last name deleted for privacy by Editor]
Ege University, Chemical Enginering Department - Ýzmir, Turkey


If at all possible, visit a plating shop, Kemal, so you have a real feel for what you will be expounding on.

I already recommended 5 different books, and I don't know what information you need for your chemical engineering diploma project that wasn't found in them. But you can search the USA's EPA sites starting at for hundreds of duplicative reports on the subject.

Ted Mooney,
Teds signature
Ted Mooney, P.E. RET
Pine Beach, New Jersey


What is the mechanism of removal of chromium. and what are the effects of chromium, nickel, zinc, lead on animals and plants.

Student - Gurgaon, India

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