lower part has been proposed for the direct filtration of secondary waste water effluent from an activated sludge treatment plant. Filtration without coagulation gave, for the model proposed, a filter run length five times that of the single sand bed filter at the rate of 120 m/day. Laboratory experiments were carried out to evaluate the optimum values of pH and aluminum dosage that gave a color removal of up to 70%. Coagulant-assisted filtration without pH control gave a color removal of up to 40%. The filter performance was measured in terms of (1)filter run length and (2)removal of color, COD and phosphate.
Direct Filtration of Secondary Waste Water Effluent by a Dual Media Filter
PEER30_267_1993.pdf
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