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    Question :
    How can hexavalent chromium be removed from aqueous waste streams?
    Category Chemical Engineering Interview Questions
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    Added on 6/18/2011
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    One option is to use ferrous sulfate to reduce the hexavalent chromium to a less toxic, trivalent chromium form that wills precipitate out of the solution. Trivalent chromium can then be reduced by sodium hydroxide.

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