Journal
BIORESOURCE TECHNOLOGY
Volume 101, Issue 10, Pages 3466-3473Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2009.12.125
Keywords
Freezing/thawing pre-treatment; Sludge disintegration; Sludge solubilization; Mixed sewage sludge; Enhanced biogas yield
Funding
- Ministry of Science and Higher Education of Poland [PBZ-MEiN-3/2/2006]
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This Study examined the effects of freezing/thawing disintegration on the characteristics of mixed (primary and waste) sewage sludge from municipal wastewater treatment plants. It also assessed the effects of freezing/thawing on anaerobic digestion, and its consequences for biogas production and digester supernatant quality. Freezing/thawing caused a decrease of more than 10% in the total chemical oxygen demand (COD), total nitrogen (TN), volatile solids (VS) and total solids (TS). A simultaneous doubling of the Soluble COD and volatile fatty acids (VFA) occurred. Release of nitrogen and phosphorus compounds was also found. The biogas yield obtained from frozen/thawed sludge was 1.31 m(3) kg(-1) of removed VS; this exceeded approximately 1.5 times the value for the raw sludge. On the basis of the global mass balance it was indicated that freezing/thawing of the mixed sewage sludge followed by anaerobic digestion could be considered as a double-phase digestion rather than a pre-treatment method. (C) 2010 Elsevier Ltd. All rights reserved.
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