Abstract
Studying sludge rheology is an important factor for the management and disposal of produced sludge in a wastewater treatment plant. In this paper, the rheological characteristics of fresh and conditioned municipal sludge at different total solid contents (ranging from 1.8 to 3.7g/l) were investigated. The selected conditioning agent was cationic polyacrylamide high molecular weight (CPAM-80). It was found that all samples behaved as shear thinning and limiting viscosity increased with increasing total solid concentration which followed Bingham model. In addition, settling index was increased by 50% with increasing solid content by 50%. The use of conditioning agent improved settling properties and the increased concentration of this agent reduced yield stress and limiting viscosity.
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