Effect of Localized Temperature Difference on Hydrogen Fermentation

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 insid...

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Autores principales:	Seongwon Im, Mo-Kwon Lee, Alsayed Mostafa, Om Prakash, Kyeong-Ho Lim, Dong-Hoon Kim
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	temperature difference H<sub>2</sub> fermentation agitation speed energy requirement Technology T
Acceso en línea:	https://doaj.org/article/38b02427e7084e7fa145c7c3c007e63c
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spelling	oai:doaj.org-article:38b02427e7084e7fa145c7c3c007e63c2021-11-11T15:43:56ZEffect of Localized Temperature Difference on Hydrogen Fermentation10.3390/en142168851996-1073https://doaj.org/article/38b02427e7084e7fa145c7c3c007e63c2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/6885https://doaj.org/toc/1996-1073In 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<sub>2</sub> yield of 1.50 mol H<sub>2</sub>/mol hexose<sub>added</sub> was achieved at ±0.1 and ±1.5 °C, while it dropped to 1.27 and 0.98 mol H<sub>2</sub>/mol hexose<sub>added</sub> 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<sub>2</sub>. 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.Seongwon ImMo-Kwon LeeAlsayed MostafaOm PrakashKyeong-Ho LimDong-Hoon KimMDPI AGarticletemperature differenceH<sub>2</sub> fermentationagitation speedenergy requirementTechnologyTENEnergies, Vol 14, Iss 6885, p 6885 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	temperature difference H<sub>2</sub> fermentation agitation speed energy requirement Technology T
spellingShingle	temperature difference H<sub>2</sub> fermentation agitation speed energy requirement Technology T Seongwon Im Mo-Kwon Lee Alsayed Mostafa Om Prakash Kyeong-Ho Lim Dong-Hoon Kim Effect of Localized Temperature Difference on Hydrogen Fermentation
description	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<sub>2</sub> yield of 1.50 mol H<sub>2</sub>/mol hexose<sub>added</sub> was achieved at ±0.1 and ±1.5 °C, while it dropped to 1.27 and 0.98 mol H<sub>2</sub>/mol hexose<sub>added</sub> 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<sub>2</sub>. 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.
format	article
author	Seongwon Im Mo-Kwon Lee Alsayed Mostafa Om Prakash Kyeong-Ho Lim Dong-Hoon Kim
author_facet	Seongwon Im Mo-Kwon Lee Alsayed Mostafa Om Prakash Kyeong-Ho Lim Dong-Hoon Kim
author_sort	Seongwon Im
title	Effect of Localized Temperature Difference on Hydrogen Fermentation
title_short	Effect of Localized Temperature Difference on Hydrogen Fermentation
title_full	Effect of Localized Temperature Difference on Hydrogen Fermentation
title_fullStr	Effect of Localized Temperature Difference on Hydrogen Fermentation
title_full_unstemmed	Effect of Localized Temperature Difference on Hydrogen Fermentation
title_sort	effect of localized temperature difference on hydrogen fermentation
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/38b02427e7084e7fa145c7c3c007e63c
work_keys_str_mv	AT seongwonim effectoflocalizedtemperaturedifferenceonhydrogenfermentation AT mokwonlee effectoflocalizedtemperaturedifferenceonhydrogenfermentation AT alsayedmostafa effectoflocalizedtemperaturedifferenceonhydrogenfermentation AT omprakash effectoflocalizedtemperaturedifferenceonhydrogenfermentation AT kyeongholim effectoflocalizedtemperaturedifferenceonhydrogenfermentation AT donghoonkim effectoflocalizedtemperaturedifferenceonhydrogenfermentation
_version_	1718434076863496192

Effect of Localized Temperature Difference on Hydrogen Fermentation

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