A Study of Alkalinity Leaching and Residual Strength of Alkaline Stabilized Sludge

by Andrew P. Kruzic, (M.ASCE), Univ of Texas at Arlington, Arlington, United States,
Thomas M. Petry, (M.ASCE), Univ of Texas at Arlington, Arlington, United States,

Document Type: Proceeding Paper

Part of: Critical Issues in Water and Wastewater Treatment


The addition of sufficient amounts of quicklime or other alkaline earth oxides to dewatered sludge raises both the pH and temperature of the sludge, resulting in microbial inactivation. At typical quicklime doses used for stabilizing sludge a sink of hydrated lime is generated, which maintains the pH in the sludge above 12 and thereby greatly inhibits microbial regrowth. Alkaline compounds also increase the structural strength of dewatered sludge due to drying and pozzolan formation. This paper reports on research to evaluate the effects of rainfall percolation on the residual alkalinity and structural strength of alkaline-amended dewatered sludge, and alkaline-amended dewatered sludge plus soil mixtures.

Subject Headings: Sludge | Alkalinity and acidity | Structural strength | pH | Soil strength | Residual strength | Rainfall

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