HEAT TREATMENT COMBINED WITH CATION ADDITION TO IMPROVE THE DEWATERABILITY OF WASTE ACTIVATED SLUDGE
Heat treatment was combined with cation addition to increase the dewaterability of waste activated sludge. Soluble protein analysis showed that heat treatment resulted in cell disruption. Dilatometry showed that bound water increased as a result of heat treatment. A centrifugal dewatering test demonstrated that cation addition (Na+, K+, Ca2+, Mg2+, and Fe3+) led to increased dewaterability. There was no correlation between the bound water content of disrupted sludge and its dewaterability. The combination of heat treatment and cation addition produced no significant changes at any of the temperatures used in this study. It is possible that higher centrifugal forces are needed for centrifugation to be an accurate measure of dewaterability.
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Document Type: Research Article
Publication date: 01 January 2004
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