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Stress Units Related to Pathogen Survivability in Biosolids- A Preliminary Study

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  037008,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14231) @2003
Authors:   Susan O’Shaughnessy, Kee Sung Kim, Christopher Y. Choi
Keywords:   Biosolids, degree-days, drying beds, pathogens, stress units, sewer sludge

The recycling of treated sewer sludge (biosolids) has become an important and controversial issue in the United States. In Arizona, the majority of treated sewer sludge is recycled as Class B biosolids and land-applied. However, the declining availability of agricultural land along with burdensome post land-application restrictions has made it imperative to explore methodologies to produce Class A biosolids. The present research focuses on the development of a model to predict the level of pathogen reduction in sludge drying beds under arid and semi-arid climate conditions. Key environmental parameters for pathogen survival in biosolids are defined for the conceptual development of a stress unit.

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