Conditioning, Filtering, and Expressing Waste Activated Sludge
Publication: Journal of Environmental Engineering
Volume 125, Issue 9
Abstract
In this study, the applied liquid pressure was used to characterize the rate and extent of activated sludge dewatering in the expression phase. By characterizing the liquid pressure, three important features of expression phase dewatering were determined. First, as the depth of sludge cake increased, the ability to express water from the sludge cake was greatly reduced. Second, iron and lime were found to be superior to polymer, especially as the applied pressure increased. Third, for either type of conditioner, increased pressure resulted in a decreased rate of expression. This was probably due to the highly compressible nature of activated sludge, which responds to pressure by becoming less porous.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 125 • Issue 9 • September 1999
Pages: 816 - 824
History
Received: Jun 1, 1998
Published online: Sep 1, 1999
Published in print: Sep 1999
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