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Wastewater from Aluminum brightening

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Q. I would like to know about the technologies used to treat the wastewaters produced during aluminum brightening using phosphoric acid. I've been looking for such information but I still cannot get a real industrial situation. Does anyone know about it or where to get information from?

Any information will be greatly appreciated.

Berta C [surname deleted for privacy by Editor]
- Spain
2000

A. Generally aluminum discharges are not regulated and your concern will be for the alloying metals in the material you are bright dipping--probably copper. But phosphate discharges can certainly be an issue as well. Sometimes a conventional end-of-pipe neutralization with an alkaline reagent, and then clarification, is all that is required.

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

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