Title: Pre-treatment mechanisms during thermophilic–mesophilic temperature phased anaerobic digestion of primary sludge
Abstract: 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 °C pre-treatment step prior to 35 °C digestion in the main stage (10–20 days). In this study, we evaluated a thermophilic–mesophilic 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.
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
Indexed In: ['crossref', 'pubmed']
Access and Citation
Cited By Count: 165
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