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Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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Waste water treatment plant

I would like to know what are the procedure and what are the chemicals need to have for maintaining waste water treatment plant...and how to decrease the chromium level in water... I would be very greatful if you suggest me this procedures..

Stephen Raj
chemist - UAE
September 18, 2009

September 21, 2009

Hi, Stephen. The most common way to treat chromium in metal plating applications is to reduce the pH to somewhere between 3.0 and 5.0, depending on the design of the reactor, and add sodium bisulfite. Once the chrome has been reduced from hexavalent to trivalent, hydroxide precipitation is possible. Here in the USA you should be certified in HAZ/MAT operations to do such things though. You really can't safely learn metal finishing wastewater treatment over the internet.

There are some good books, though, like Kushner's "Water and Waste Control for the Plating Shop" ⇦[this on eBay, Amazon, AbeBooks affil links] and Clarence Roy's "Operation and Maintenance of Surface Finishing Wastewater Treatment Systems" ⇦[this on eBay, Amazon, or AbeBooks affil links]. Good luck.

Regards,

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

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