Hexavalent Chrome

Hexavalent Chrome

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FAQ

Q. Will Hexavalent Chrome (Cr 6+) precipitate with conventional pH adjustment?
A. No, you must first reduce Chrome 6+ to Trivalent (Cr 3+) Chrome. The first stage involves pH adjustment to 2.5 to promote reduction reaction. Then addition of a reducing agent, like sodium bisulfite. This should be high mix for at least 10 – 15 minutes. The second stage is to raise the pH to 7.5-8.5 where trivalent chrome will precipitate. Coagulants and Flocculants are also typically used to promote efficient clarification.

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