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Effect of Substrate-to-Inoculum Ratio and Temperatures During the Start-up of Anaerobic Digestion of Fish Waste

by Arma Yulisa 1 ORCID https://orcid.org/0000-0003-4943-0696 , Chayanee Chairattanawat 1 , Sang Hyeok Park 1 ORCID https://orcid.org/0000-0002-9450-2639 , Md Abu Hanifa Jannat 1 , Seokhwan Hwang 1 , 2 ,
1 Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Pohang, Gyeongbuk 37673, Republic of Korea.
2 Institute for Convergence Research and Education in Advanced Technology (I-CREATE), Yonsei University, 85 Songdogwahak-ro, Yeonsu-gu, Incheon 21983, Republic of Korea.

SUBMITTED: 29 March 2022; ACCEPTED: 22 April 2022; PUBLISHED: 8 May 2022

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Abstract

Abstract

The high protein and lipid content of fish waste makes mono-digestion a difficult bioprocess for an anaerobic digestion (AD) system. On the other hand, the massive increase in fish and seafood consumption worldwide has led to an inevitable fish waste mono-AD. Therefore, this study was conducted to investigate the effects of food-to-microorganisms (F/M) ratios and temperatures during the start-up period of fish waste mono-digestion. F/M ratios of 0.5, 1, 2, and 3 on a g-COD/g-VSS basis were operated at 35°C and 45°C, representing mesophilic and hyper-mesophilic conditions, respectively. The increase in F/M ratio improved the maximum methane (CH4) production rate at both temperatures. However, F/M ratio of 0.5 generated the highest CH4 yield in mesophilic and hyper-mesophilic conditions (0.23±0.00 L-CH4/g-CODinput). Further increase in F/M ratio decreased CH4 yield up to 21.74% and 39.13% when the reactors were operated at 35°C and 45°C, respectively. When reactors were supplied with FM ratios of 0.5, 1, and 2, hyper-mesophilic temperature improved methanogenesis by up to 2.61% and shortened the lag phase by 22.88%. Meanwhile, F/M ratio 3 at 45°C decreased cumulative CH4 production by up to 26.57% and prolonged the lag phase by 10.19%. The result of this study is beneficial to managing the input substrate of a batch-AD system that treats fish waste as a sole substrate.

Keywords: Anaerobic digestion; F/M ratio; Fish waste; Mono-digestion; Start-up

Creative Commons Attribution 4.0 International (CC BY 4.0) License
© 2022 Arma Yulisa, Chayanee Chairattanawat, Sang Hyeok Park, Md Abu Hanifa Jannat, Seokhwan Hwang. This is an open access article distributed under the Creative Commons Attribution 4.0 International (CC BY 4.0) License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Yulisa, A., Chairattanawat, C., Park, S. H., Jannat, M. A. H., & Hwang, S. (2022). Effect of Substrate-to-Inoculum Ratio and Temperatures During the Start-up of Anaerobic Digestion of Fish Waste. Industrial and Domestic Waste Management, 2(1), 17–29. https://doi.org/10.53623/idwm.v2i1.80
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