Abstract
Shirato's expression theory, which is based on Ruth's filtration theory and Terzaghi's consolidation theory, was applied to an analysis of the dewatering characteristics in activated sludges. It was ascertained that the process could be divided into periods of filtration and consolidation. It was further confirmed that Ruth's average specific resistance ( α av) was increased and Shirato's modified consolidation coefficient (C e) decreased by adding the extracellular polymer substance extracted from the sludges. That is to say, the extracellular polymer was found to have a bad effect on the dewatering process through the two periods. From the results of compression-permeability testing, the addition of extracellular polymer was found not to affect the local porosity (ϵ), but it did have a great influence on the local specific filtration resistance (α).
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