Effect of Localized Temperature Difference on Hydrogen Fermentation

Seongwon Im, Mo-Kwon Lee, Alsayed Mostafa, Om Prakash, Kyeong-Ho Lim and Dong-Hoon Kim
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Seongwon Im: Department of Smart-City Engineering, Inha University, 100 Inharo, Michuhol-gu, Incheon 22212, Korea
Mo-Kwon Lee: Department of Smart-City Engineering, Inha University, 100 Inharo, Michuhol-gu, Incheon 22212, Korea
Alsayed Mostafa: Department of Smart-City Engineering, Inha University, 100 Inharo, Michuhol-gu, Incheon 22212, Korea
Om Prakash: Department of Smart-City Engineering, Inha University, 100 Inharo, Michuhol-gu, Incheon 22212, Korea
Kyeong-Ho Lim: Department of Civil and Environmental Engineering, Kongju National University, Cheonan, Chungnam 31080, Korea
Dong-Hoon Kim: Department of Smart-City Engineering, Inha University, 100 Inharo, Michuhol-gu, Incheon 22212, Korea

Energies, 2021, vol. 14, issue 21, 1-11

Abstract: In a lab-scale bioreactor system, (20 L of effective volume in our study) controlling a constant temperature inside bioreactor with a total volume 25 L is a simple process, whereas it is a complicated process in the actual full-scale system. There might exist a localized temperature difference inside the reactor, affecting bioenergy yield. In the present work, the temperature at the middle layer of bioreactor was controlled at 35 °C, while the temperature at top and bottom of bioreactor was controlled at 35 ± 0.1, ±1.5, ±3.0, and ±5.0 °C. The H 2 yield of 1.50 mol H 2 /mol hexose added was achieved at ±0.1 and ±1.5 °C, while it dropped to 1.27 and 0.98 mol H 2 /mol hexose added at ±3.0 and ±5.0 °C, respectively, with an increased lactate production. Then, the reactor with automatic agitation speed control was operated. The agitation speed was 10 rpm (for 22 h) under small temperature difference (<±1.5 °C), while it increased to 100 rpm (for 2 h) when the temperature difference between top and bottom of reactor became larger than ±1.5 °C. Such an operation strategy helped to save 28% of energy requirement for agitation while producing a similar amount of H 2 . This work contributes to facilitating the upscaling of the dark fermentation process, where appropriate agitation speed can be controlled based on the temperature difference inside the reactor.

Keywords: temperature difference; H 2 fermentation; agitation speed; energy requirement (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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