Abstract
The effect of physico-chemical characteristics of greywater on its chemical coagulation was assessed employing real greywater with varying characteristics using both alum and polyaluminium chloride (PACl) as coagulants. Optimum PACl dosages required were significantly less compared to alum for similar initial turbidity levels. Also, PACl produced less turbid treated greywater. As the initial pH increased, the optimum coagulant dose also increased for both alum and PACl. At similar optimum dosages, PACl gave higher COD removal compared to alum. Total coliform removal showed no significant difference with removals of 98.3% and 98.9%, respectively for alum and PACl.
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