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http://dx.doi.org/10.17137/korrae.2021.29.4.99

Enhancement of anaerobic digestion of sewage sludge by combined process with thermal hydrolysis and separation  

Lee, See-Young (Department of Environmental Engineering, Graduate School, The University of Seoul)
Han, Ihn-Sup (Department of Environmental Engineering, Graduate School, The University of Seoul)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.29, no.4, 2021 , pp. 99-106 More about this Journal
Abstract
The purpose of this study was to evaluate the performance of novel process with thermal hydrolysis and separation as pre-treatment of anaerobic digestion (AD). The dewatered sludge was pre-treated using THP, and then separated. The separated liquid used as substrate for AD and separated solid was returned on THP(Thermal Hydrolysis Process). The degree of disintegration (DD, based on COD) using only THP found 45.1-49.3%. The DD using THP+separation found 76.1-77.6%, which was higher than only THP. As result from dual-pool two-step model, the ratio of rapidly degradable substrate to total degradable substrate found 0.891-0.911 in separated liquid, which was higher than only THP. However, the rapidly degradable substrate reaction constant (kF) of only THP and THP+separation were similar. This results found that dewatered sludge was disintegrated by THP, and then rapidly degradable substrate of hydrolyzed sludge was sorted by separation.
Keywords
Thermal hydrolysis; Separation; Anaerobic digestion; Dewatered sludge; Dual-pool two-step model;
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