Journal
WATER RESEARCH
Volume 44, Issue 1, Pages 123-130Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2009.09.005
Keywords
Temperature phased anaerobic digestion; Thermophilic pre-treatment; Mesophilic pre-treatment; Primary sludge
Funding
- Queensland State Government
- Meat and Livestock Australia, and Environmental Biotechnology Cooperative Research Centre (EBCRC), Australia
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Pre-treatment is used extensively to improve degradability and hydrolysis rate of material being fed into digesters. One emerging process is temperature phased anaerobic digestion (TPAD), which applies a short (2 day) 50-70 degrees C pre-treatment step prior to 35 degrees C digestion in the main stage (10-20 days). In this study, we evaluated a thermophilic-mesophihc TPAD against a mesophilic-mesophilic TPAD treating primary sludge. Thermophilic-mesophilic TPAD achieved 54% VS destruction compared to 44% in mesophilic-mesophilic TPAD, with a 25% parallel increase in methane production. Measurements of soluble COD and NH4+-N showed increased hydrolysis extent during thermophilic pre-treatment. Model based analysis indicated the improved performance was due to an increased hydrolysis coefficient rather than an increased inherent degradability, suggesting while TPAD is suitable as an intensification process, a larger main digester could achieve similar impact. (C) 2009 Elsevier Ltd. All rights reserved.
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