Effect of Sludge Blend on Dewatering Characteristics

by Ali Davarinejad, Montgomery Watson, Pasadena, United States,
Nikolay Voutchkov, Montgomery Watson, Pasadena, United States,

Document Type: Proceeding Paper

Part of: Critical Issues in Water and Wastewater Treatment


This study compares the performance of high solids centrifuges when processing anaerobically digested and undigested mixture of primary sludge and waste activated sludge, in order to evaluate the effect of sludge blend ratio on the dewaterability of the sludge. The operational data (full scale and pilot scale) of six selected wastewater treatment plants were analyzed during the course of this study. Three of the six plants dewater anaerobically digested sludge, two dewater raw sludge, and one dewaters both digested sludge and raw sludge in parallel trains. Several key operational parameters including: primary to waste activated sludge ratio, feed rate, polymer dosage, cake solids concentration, and solids recovery were evaluated in order to provide a basis for comparison of the centrifuge performance. The data indicates that the sludge blend (primary to waste activated sludge ratio) has a significant effect on the dewaterability of both digested and undigested sludges. Under similar operating conditions, cake concentration increases with increasing the primary sludge fraction.

Subject Headings: Sludge | Waste treatment | Anaerobic processes | Activated sludge | Wastewater treatment plants | Industrial wastes | Dewatering

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