Two-phase thermophilic acidification and mesophilic methanogenesis anaerobic digestion of waste-activated sludge

Demirer, G and Othman, M 2008, 'Two-phase thermophilic acidification and mesophilic methanogenesis anaerobic digestion of waste-activated sludge', Environmental Engineering Science, vol. 25, no. 9, pp. 1291-1300.


Document type: Journal Article
Collection: Journal Articles

Title Two-phase thermophilic acidification and mesophilic methanogenesis anaerobic digestion of waste-activated sludge
Author(s) Demirer, G
Othman, M
Year 2008
Journal name Environmental Engineering Science
Volume number 25
Issue number 9
Start page 1291
End page 1300
Total pages 10
Publisher Mary Ann Liebert, Inc.
Abstract Biological pretreatment methods of waste-activated sludge (WAS) have recently received attention because of their efficiency and relatively low investment. The application of hydrolysis/acidification step before methanization in anaerobic digestion or the two-phase anaerobic digestion process constitutes one of these methods. Two phase (thermophilic acidification and mesophilic methanogenesis) anaerobic digestion of WAS was investigated and reported to perform better in terms of chemical oxygen demand (COD) solubilization, volatile solids destruction, gas production, and pathogen indicator reduction. The solids loading rates (SLR) used in these studies were significantly high (6.5-28.9 g volatile solids (VS)/L·day). It is well-known that high SLRs along with low retention times lead to higher acidification in two-phase systems. However, WAS from different wastewater treatment plants is likely to have different concentrations due to different process configurations and operational practices that lead to lower solids loading rates. Therefore, this study investigated the performance of thermophilic anaerobic preacidification of WAS prior to conventional mesophilic (methanogenic) anaerobic digestion at low SLRs (0.98-3.93 g VS/L·day). To this purpose, continuous anaerobic acidogenic reactors with no recycle were operated at two different HRT (or SRT) values of 2 and 4 days, and three different SLR values of 0.98, 1.97, and 3.93 g VS/L·day.
Subject Environmental Science and Management not elsewhere classified
Keyword(s) anaerobic digestion
waste activated sludge
phase separation
acidification
DOI - identifier 10.1089/ees.2007.0242
Copyright notice © Mary Ann Liebert, Inc. 2008.
ISSN 1092-8758
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