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  • Title: Pre-treatment mechanisms during thermophilic-mesophilic temperature phased anaerobic digestion of primary sludge.
    Author: Ge H, Jensen PD, Batstone DJ.
    Journal: Water Res; 2010 Jan; 44(1):123-30. PubMed ID: 19800093.
    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 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-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 NH(4)(+)-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.
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