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Article

Optimization of Hydrolysis-Acidogenesis Phase of Swine Manure for Biogas Production Using Two-Stage Anaerobic Fermentation

1
Green Energy and Biotechnology Industry Research Center, Feng Chia University, Taichung City 40724, Taiwan
2
Master’s Program of Green Energy Science and Technology, Feng Chia University, Taichung City 40724, Taiwan
3
Department of Environmental Engineering and Science, Feng Chia University, Taichung City 40724, Taiwan
4
Department of Chemical and Environmental Engineering, Faculty of Science and Engineering, University of Nottingham Malaysia, Semenyih 43500, Selangor, Malaysia
5
Professional Master’s Program for Intelligent Manufacturing and Engineering Management, Feng Chia University, Taichung City 40724, Taiwan
6
Department of Landscape Architecture, Chung Chou University of Science and Technology, Changhwa 51000, Taiwan
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Bipro R. Dhar
Received: 30 June 2021 / Revised: 23 July 2021 / Accepted: 28 July 2021 / Published: 29 July 2021
(This article belongs to the Special Issue Redesign Processes in the Age of the Fourth Industrial Revolution)
The traditional pig manure wastewater treatment in Taiwan has been low in methane production efficiency due to unstable influent concentration, wastewater volume, and quality. Two-stage anaerobic systems, in contrast, have the advantage of buffering the organic loading rate in the first stage (hydrolysis-acidogenesis phase), allowing a more constant feeding rate to the second stage (methanogenesis phase). Response surface methodology was applied to optimize the operational period (0.5–2.0 d) and initial operational pH (4–10) for hydrolysis and acidogenesis of the swine manure (total solid 5.3%) at 35 °C in batch operation mode. A methanogenesis verification experiment with the optimal condition of operational period 1.5 d and pH 6.5 using batch operation resulted in peak volatile acid production 7 g COD/L, methane production rate (MPR) 0.3 L-CH4/L-d, and methane yield (MY) 92 mL-CH4/g-CODre (chemical oxygen demand removed). Moreover, a two-stage system including a hydrolysis-acidogenesis reactor with the optimal operating condition and a methanogenesis reactor provided an average MPR 163 mL/L-d and MY 38 mL/g volatile solids, which values are 60% higher than those of a single-stage system; both systems have similar dominant methane-producing species of Firmicutes and Bacteroidetes with each having around 30%–40%. The advantages of a two-stage anaerobic fermentation system in treating swine manure for biogas production are obvious. View Full-Text
Keywords: two-stage anaerobic digestion; biomethane; swine manure; operational time; response surface methodology (RSM) two-stage anaerobic digestion; biomethane; swine manure; operational time; response surface methodology (RSM)
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MDPI and ACS Style

Lin, C.-Y.; Chai, W.S.; Lay, C.-H.; Chen, C.-C.; Lee, C.-Y.; Show, P.L. Optimization of Hydrolysis-Acidogenesis Phase of Swine Manure for Biogas Production Using Two-Stage Anaerobic Fermentation. Processes 2021, 9, 1324. https://0-doi-org.brum.beds.ac.uk/10.3390/pr9081324

AMA Style

Lin C-Y, Chai WS, Lay C-H, Chen C-C, Lee C-Y, Show PL. Optimization of Hydrolysis-Acidogenesis Phase of Swine Manure for Biogas Production Using Two-Stage Anaerobic Fermentation. Processes. 2021; 9(8):1324. https://0-doi-org.brum.beds.ac.uk/10.3390/pr9081324

Chicago/Turabian Style

Lin, Chiu-Yue, Wai S. Chai, Chyi-How Lay, Chin-Chao Chen, Chun-Yi Lee, and Pau L. Show 2021. "Optimization of Hydrolysis-Acidogenesis Phase of Swine Manure for Biogas Production Using Two-Stage Anaerobic Fermentation" Processes 9, no. 8: 1324. https://0-doi-org.brum.beds.ac.uk/10.3390/pr9081324

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