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Abatement of chromate and phosphate from wastewater

Kowalski Z., Konopka M.

Polish Journal of Chemical Technology

2001

Vol. 3, nr 2

8-10

This work presents the results of the model research on treatment of the wastewater which contains both chromate and phosphate ions. Co-removing of the phosphate and chromate ions from the wastewater was realised with the method of reduction of Cr exp.6+ with iron (II) salts and precipitation as chromium hydroxide. It is possible to decrease the CrO4 exp.2 and PO4 exp2 concentration to a level below 0.01 ppm. The solid phase (filter cake) contained quantitatively precipitated ions of trivalent metals and phosphate and partially precipitated sulphate and calcium ions.