Effect of Precipitating Efficiencies of Magnesium Oxide, Alum and PAC-18 in the Treatment of Chrome Tan Liquor
Prakash NanjanBellie, Vimala Sockan, Syed Ikmal Murtaza

Abstract
The efficiencies of chemical precipitating agents for the removal of chromium from spent chrome Tan liquor was compared and studied. The advantages of a selected precipitating agent over others with respect to sludge formation, dosage, pH, minimum turbidity have been studied for MgO, Alum and PAC-18. It was observed that PAC-18 proved to be a better coagulant than alum, as lower turbidity and organic matter content were observed in samples treated by PAC-18, than in samples treated by alum. Furthermore, it was deduced that higher removal capacities were obtained at a high pH value, 8.0.

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