Removal of Algae in Stabilization Ponds Effluent using Moringa Oleifera Coagulant

Abstract

A number of studies have proved natural coagulants achieve high turbidity removal in water treatment. A pilot scale study was conducted to evaluate the effectiveness of natural coagulant (moringa oleifera) with respect to algae removal. Required effluent from stabilization ponds was diverted into the horizontal baffle flocculator and then treated by coagulation and flocculation using dry moringa oleifera seeds. Using moringa oleifera, chlorophyll-a, turbidity and TSS were reduced by 78%, 85% and 82% respectively at optimum dosage of 175mg/l. This was achieved at optimum flocculation conditions ie retention time of 4.1 minutes and 33.3% degree of agitation. These parameters were used in evaluating removal rates of algae. Sludge was found to contain protein content in the range of 40-45%, which can act as protein substitute in animal feeds. Hence moringa oleifera as coagulant can effectively remove algae and improve effluent quality.

Keywords: Moringa oleifera, Coagulant, Stabilization pond effluent, Turbidity, algae

Journal of Civil Engineering Research and Practice Vol. 5 (1) 2008: pp. 53-61