PRESSURE FILTRATION OF AGGREGATED SEWAGE SLUDGE

摘要

Different aggregation mechanisms are described and their merits discussed in terms of dewatering of sewage sludge by pressure filtration.The aggregation of sewage sludge particles is common practice prior to pressure filtration.The increased effective particle size leads to rapid initial release of water,minimal filter cloth blinding and a structured filter cake,which can continue to release water under pressure.This paper discusses several aggregation mechanisms induced by the use of synthetic polyelectrolytes and explains the dewatering properties in relation to polyelectrolyte properties.