Authors: Xiaojue Li, Naoto SHIMIZU
Identifier: CSBE21812
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Published in: CSBE-SCGAB Technical Conferences » 5th CIGR and AGM Quebec City 2021 » Special Session on Biogas

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Description: To enhance anaerobic biodegradability, pretreatments and co-digestion with other biomass wastes could be effective methods to eliminate the hydrolysis rate limitation for achieving high performance of food waste (FW) anaerobic digestion. In this study, the use of lipase addition (LA, 0.5g/L), hydrothermal pretreatment (HTP, 120?C for 60 min) and a combination of both methods (HTP + LA) were applied to hydrolyze the organic matters in FW, and also the effects of crude glycerol (CG) as co-substrate was assessed with 0%, 5% and 10% of volatile solids (VS).Batch tests showed that untreated FW co-digestion with CG resulted in higher methane yields. In particular, the maximum specific methane yield (SMY) potential of 214.3NL CH4/kg VS occurred at a substrate ratio of 90:10 (FW:CG, %VS), compared to mono-digestion. However, for pretreated FW, the CG addition exerted a negative impact on anaerobic digestion performance as the proportion of CG increased because of propionic acid accumulation acidifying the reactors thus breaking the balance of the anaerobic system and inhibiting the growth of methanogens. Among these three types of pretreatments, it was demonstrated that the pretreatment of FW by HTP combined with LA advanced the appearance time of methane peaks and would be a promising option for enhancing SMY value (642.8NL CH4/kg VS) as well as for maximizing methane potential according to the modified Gompertz model.

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Date: 2021-06-11
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Conference name: 5th CIGR International Conference and CSBE-SCGAB AGM 2021, Quebec City,QC, 11-14 May 2021.
Session name: Special Session Biogas

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Type: Text.Abstract
Publication type: Presentation
Coverage: Japan
Language 1: en
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Rights: Canadian Society for Bioengineering
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