REUSE OF INORGANIC SLUDGE AS A COAGULANT ON COLLOIDAL SUSPENSION REMOVAL IN RAW SURFACE WATER TREATMENT

Kafeel Ahmad

Abstract: The potable water obtained from surface water sources usually entails the use of a coagulation–flocculation stage to remove turbidity in the form of colloidal suspensions. The coagulation performance of acidified sludge has been studied by jar test. The jar tests have been conducted using water sample collected from river Yamuna at Wazirabad, New Delhi. The acidified sludge coagulation attained comparatively high turbidity removal efficiency, and the treated water having less than 5NTU turbidity could be obtained with initial turbidities from 25 to 70 NTU. The results of turbidity removal from acidified sludge showed significant reduction (50 to 98% at variable conditions) when compared with Al2(SO4)3. The acidified sludge as a coagulant aid has been found to be more effective than that of alum and it significantly reduces the sludge production.

Keywords: recycled sludge, colloidal suspension, coagulation, surface water, turbidity removal, water treatment

DOI: https://doi.org/10.15623/ijret.2012.0104015