METHOD AND APPARATUS FOR TREATING HEXAVALENT CHROMIUM-CONTAINING WASTEWATER WITH BISULFITE

摘要

PROBLEM TO BE SOLVED: To reduce hexavalent chromium in hexavalent chromium-containing wastewater to trivalent chromium to sharply decrease the concentration of hexavalent chromium.;SOLUTION: In the method of treating hexavalent chromium-containing wastewater with bisulfite by adding a bisulfite to the chromium-containing wastewater to reduce hexavalent chromium to trivalent chromium, the amount of bisulfite to be added is controlled on the basis of the concentrations of hexavalent chromium and dissolved oxygen in wastewater.;COPYRIGHT: (C)2004,JPO&NCIPI