Effect of pH on the performance of an acidic biotrickling filter for simultaneous removal of H2S and siloxane from biogas

Acidic biotrickling filters (BTF) can be used for simultaneous removal of hydrogen sulfide (H2S) and siloxane from biogas. In this study, the performance of a BTF under different acidic pH conditions was investigated. The removal profile of H2S showed that 90% of H2S removal was achieved during the...

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Autores principales:	Yuyao Zhang, Kazuyuki Oshita, Masaki Takaoka, Yu Kawasaki, Daisuke Minami, Go Inoue, Toshihiro Tanaka
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	biogas biotrickling filter hydrogen sulfide ph siloxane Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/3eaaa34314a44932b1af6099084c8b57
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spelling	oai:doaj.org-article:3eaaa34314a44932b1af6099084c8b572021-11-06T10:54:00ZEffect of pH on the performance of an acidic biotrickling filter for simultaneous removal of H2S and siloxane from biogas0273-12231996-973210.2166/wst.2021.083https://doaj.org/article/3eaaa34314a44932b1af6099084c8b572021-04-01T00:00:00Zhttp://wst.iwaponline.com/content/83/7/1511https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Acidic biotrickling filters (BTF) can be used for simultaneous removal of hydrogen sulfide (H2S) and siloxane from biogas. In this study, the performance of a BTF under different acidic pH conditions was investigated. The removal profile of H2S showed that 90% of H2S removal was achieved during the first 0.4 m of BTF height with down-flow biogas. Decamethylcyclopentasiloxane (D5) removal decreased from 34.5% to 15.6% when the pH increased from 0.88 to 3.98. Furthermore, the high partition coefficient of D5 obtained in under higher pH condition was attributed to the higher total ionic strength resulting from the addition of sodium hydroxide solution and mineral medium. The linear increase in D5 removal with the mass transfer coefficient (kL) indicated that the acidic recycling liquid accelerated the mass transfer of D5 in the BTF. Therefore, the lower partition coefficient and higher kL under acidic pH conditions lead to the efficient removal of D5. However, the highly acidic pH 0.9 blocked mass transfer of H2S and O2 gases to the recycling liquid. Low sulfur oxidation activity and low Acidithiobacillus sp. content also deteriorated the biodegradation of H2S. Operating the BTF at pH 1.2 was optimal for simultaneously removing H2S and siloxane. HIGHLIGHTS Effect of pH on the performance of acidic BTF for simultaneous removal of H2S and siloxane was investigated.; A linear positive correlation was observed between the mass transfer coefficient and the removal efficiency of D5.; Evolution in microbial community under various acidic pH conditions was investigated.; Operating the BTF at pH 1.2 was optimal for simultaneous efficient removal of H2S and siloxane from biogas.;Yuyao ZhangKazuyuki OshitaMasaki TakaokaYu KawasakiDaisuke MinamiGo InoueToshihiro TanakaIWA Publishingarticlebiogasbiotrickling filterhydrogen sulfidephsiloxaneEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 7, Pp 1511-1521 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	biogas biotrickling filter hydrogen sulfide ph siloxane Environmental technology. Sanitary engineering TD1-1066
spellingShingle	biogas biotrickling filter hydrogen sulfide ph siloxane Environmental technology. Sanitary engineering TD1-1066 Yuyao Zhang Kazuyuki Oshita Masaki Takaoka Yu Kawasaki Daisuke Minami Go Inoue Toshihiro Tanaka Effect of pH on the performance of an acidic biotrickling filter for simultaneous removal of H2S and siloxane from biogas
description	Acidic biotrickling filters (BTF) can be used for simultaneous removal of hydrogen sulfide (H2S) and siloxane from biogas. In this study, the performance of a BTF under different acidic pH conditions was investigated. The removal profile of H2S showed that 90% of H2S removal was achieved during the first 0.4 m of BTF height with down-flow biogas. Decamethylcyclopentasiloxane (D5) removal decreased from 34.5% to 15.6% when the pH increased from 0.88 to 3.98. Furthermore, the high partition coefficient of D5 obtained in under higher pH condition was attributed to the higher total ionic strength resulting from the addition of sodium hydroxide solution and mineral medium. The linear increase in D5 removal with the mass transfer coefficient (kL) indicated that the acidic recycling liquid accelerated the mass transfer of D5 in the BTF. Therefore, the lower partition coefficient and higher kL under acidic pH conditions lead to the efficient removal of D5. However, the highly acidic pH 0.9 blocked mass transfer of H2S and O2 gases to the recycling liquid. Low sulfur oxidation activity and low Acidithiobacillus sp. content also deteriorated the biodegradation of H2S. Operating the BTF at pH 1.2 was optimal for simultaneously removing H2S and siloxane. HIGHLIGHTS Effect of pH on the performance of acidic BTF for simultaneous removal of H2S and siloxane was investigated.; A linear positive correlation was observed between the mass transfer coefficient and the removal efficiency of D5.; Evolution in microbial community under various acidic pH conditions was investigated.; Operating the BTF at pH 1.2 was optimal for simultaneous efficient removal of H2S and siloxane from biogas.;
format	article
author	Yuyao Zhang Kazuyuki Oshita Masaki Takaoka Yu Kawasaki Daisuke Minami Go Inoue Toshihiro Tanaka
author_facet	Yuyao Zhang Kazuyuki Oshita Masaki Takaoka Yu Kawasaki Daisuke Minami Go Inoue Toshihiro Tanaka
author_sort	Yuyao Zhang
title	Effect of pH on the performance of an acidic biotrickling filter for simultaneous removal of H2S and siloxane from biogas
title_short	Effect of pH on the performance of an acidic biotrickling filter for simultaneous removal of H2S and siloxane from biogas
title_full	Effect of pH on the performance of an acidic biotrickling filter for simultaneous removal of H2S and siloxane from biogas
title_fullStr	Effect of pH on the performance of an acidic biotrickling filter for simultaneous removal of H2S and siloxane from biogas
title_full_unstemmed	Effect of pH on the performance of an acidic biotrickling filter for simultaneous removal of H2S and siloxane from biogas
title_sort	effect of ph on the performance of an acidic biotrickling filter for simultaneous removal of h2s and siloxane from biogas
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/3eaaa34314a44932b1af6099084c8b57
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Effect of pH on the performance of an acidic biotrickling filter for simultaneous removal of H2S and siloxane from biogas

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