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Title:Continuous thickening of non-ideal suspensions
Author(s):Dick, Richard, I.; Javaheri, Ali, R.
Contributor(s):University of Illinois at Urbana-Champaign
Subject(s):Water resource development--Illinois
Water resources development
Waste water
Activated sludge
Water softening sludge
Waste treatment
Water treatment
Sludge treatment
Sludge disposal
Geographic Coverage:Illinois (state)
Abstract:The purpose of this study was to investigate the steady state continuous thickening of non-ideal suspensions such as sludges from water and wastewater treatment plants. Suspensions of high grade calcium carbonate, activated sludges, water softening sludges, and suspensions of fine glass beads were used. The suspensions were thickened in a closed, continuous, pi lot, thickening system. The sol ids flux theory was used successfully for predicting performance of the steady state continuous thickener from batch settling velocities of the suspensions. For the optimal performance of the thickener, effective stirring of concentration layers near the underflow level was found to be an absolute necessity. This was to prevent dilute solids from reaching the thickener bottom. Homogeneous distribution of the feed over the area of the tank was also essential. The feed concentration generally did not affect the thickening function. However, the interaction between thickening and clarification functions of the tank was established through the magnitude of feed concentrations. As the feed concentration decreased with fixed solids loading, the overflow velocity increased, and the clarity of overflow generally deteriorated.
Issue Date:1972-03
Publisher:University of Illinois at Urbana-Champaign. Water Resources Center
Genre:Report (Grant or Annual)
Sponsor:U.S. Department of the Interior
U.S. Geological Survey
Rights Information:Copyright 1972 held by Richard I. Dick, Ali R. Javaheri
Date Available in IDEALS:2016-06-20

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