Proper sludge conditioning facilitates better dewatering of sludges. Sludge conditioning techniques required for different sludges bigbly depend on the properties of the sludges. Dewatering characteristics of oily sludges were studied for different degrees of oil content in sludge with lime as sludge conditioner. The optimum dosage of lime was found to range from 6% to 10% to yield favourable characteristics of the sludge for better filterability. Also the established correlations between the combinations of dewatering characteristics, such as specific resistance, capillary suction time, cake solid content and filter yield provide means of quick indication for the nature of the sludges.

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