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topic 6145

Wastewater from Aluminum brightening


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 [last name deleted for privacy by Editor]
- Spain

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.

For better response from our readers, please describe your own situation rather than a contextless abstract question, Berta. Are you a student? An environmental consultant? Operator of a bright dipping facility? Are we talking 100 gallons per day or 100 gallons per minute? Dumping an exhausted concentrated solution, or just the rinsewater?

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

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