I want to warranty less than 0.5 mg./L of Hexavalent Chromium and less than 10 Mg/L of Total Chromium in the effluent of a tannery. What is the best technological option.

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I want to warranty less than 0.5 mg./L of Hexavalent Chromium and less than 10 Mg/L of Total Chromium in the effluent of a tannery. What is the best technological option.