Authors: Risu Na, Naoto Shimizu
Published in: CSBE-SCGAB Technical Conferences » 5th CIGR and AGM Quebec City 2021 » Special Session on Biogas
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Description: Anaerobic digestion (AD) is widely used on a global scale for waste management and energy production. However, process instability of AD is a common issue and may result in underperformance or short-term process failure. To address this issue, a new control approach based on constant total solids (TS) content in the digestate during AD was developed using a mass balance equation. The process stability was examined by monitoring volatile fatty acids, total ammonia nitrogen, and pH. Substrate-specific methane yield (m3-CH4/kg-VS) was used to assess the effectiveness of the controlled conditions. AD was carried out under thermophilic conditions (53 ? 2 ?C) in a semi-continuous type reactor with a working volume of 235 L. Two levels of TS content [desired values of 4% wet basis (w.b.) and 6% (w.b.)] were compared with conventional control over an experimental period of 64 days. The results showed that constant TS in the digestate [within 1% (w.b.) of the desired level] gave increased levels of biogas production (10.2%) and methane (13.5%) at 4% TS, and respective increases of 16.6% and 21.2% at 6% TS when compared with standard operation.
Conference name: 5th CIGR International Conference and CSBE-SCGAB AGM 2021, Quebec City,QC, 11-14 May 2021.
Session name: Special Session Biogas
Publication type: Presentation
Language 1: en
Rights: Canadian Society for Bioengineering