Author： Salsali Hamidreza Parker Wayne
Publisher： Water Environment Federation
ISSN： 1938-6478
Source： Proceedings of the Water Environment Federation, Vol.2005, Iss.2, 2005-01, pp. : 836-848
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Abstract
This study evaluated the efficiency of staged operation of mesophilic anaerobic digester for pathogen removal from municipal sewage sludge. In this study two parallel three stage set ups each consisting three digesters in series (System I: 35°C-35°C-35°C and System II: 42°C-35°C-35°C), and one two stage setup consisting two reactors in series (System III: 35°C-35°C) were compared against a conventional single stage digester. The results showed that two and three stage operation were able to achieve Volatile Solids (VS) reduction of greater than 38%, which is required for vector attraction reduction. Staged operation improved VS reduction and biogas production as compared to single stage operation and 3 stage operation was superior to 2 stage operation. Stable operation in two and three stage configurations were indicated by low concentrations of total volatile fatty acids (TVFA) and substantial alkalinity generation. For all of the indicators examined staged operation resulted in superior inactivation as compared to single stage operation. With the exception of
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