Microbiological Stabilization Through Aerobic Digestion and Storageby Rao Y. Surampalli, U.S. EPA, Kansas City, United States,
Shankha K. Banerji, U.S. EPA, Kansas City, United States,
J. C. Chen, U.S. EPA, Kansas City, United States,
Abstract: A study was conducted to evaluate the pathogen indicator bacterial reductions in the sludges of six wastewater treatment plants. These plants were extended aeration and oxidation ditch type plants, except one, which was a trickling filter plant. Sludge samples from two wastewater plants were also collected to run laboratory investigations to determine the sludge pathogen reductions in aerobic digestion and in storage. Fecal coliform, fecal streptococcus and salmonella were measured on all sludge samples. Total suspended solids, VSS, pH, and temperature were also measured. Most of the extended aeration and oxidation ditch plants under study were meeting the proposed EPAs Class 'B' pathogen reduction criteria. The improved pathogen reduction is related to the design of the plant. Laboratory aeration and storage studies of extended aeration and oxidation ditch plant sludges indicated further pathogen indicator organisms reduction of at least one order.
Subject Headings: Pathogens | Sludge | Aeration | Wastewater treatment plants | Oxidation | Waste storage | Bacteria | Waste treatment
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