Enhanced anaerobic phenol degradation by conductive materials via EPS and microbial community alteration

Anaerobic biodegradation is a promising and economical process to remove phenol in the wastewater, although the reaction kinetics are often limited by the toxicity of phenol. This study proposed a strategy to accelerate phenol degradation and mitigate its inhibition on the bioprocess by adding condu...

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Main Authors: Yan, Wangwang, Sun, Faqian, Liu, Jianbo, Zhou, Yan
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/136937
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1369372020-02-06T03:38:47Z Enhanced anaerobic phenol degradation by conductive materials via EPS and microbial community alteration Yan, Wangwang Sun, Faqian Liu, Jianbo Zhou, Yan School of Civil and Environmental Engineering Advanced Environmental Biotechnology Centre Nanyang Environment and Water Research Institute Engineering::Environmental engineering Phenol Degradation Extracellular Polymeric Substances (EPS) Anaerobic biodegradation is a promising and economical process to remove phenol in the wastewater, although the reaction kinetics are often limited by the toxicity of phenol. This study proposed a strategy to accelerate phenol degradation and mitigate its inhibition on the bioprocess by adding conductive materials (CMs) into the anaerobic degradation system. The results showed that CMs could stimulate phenol degradation up to one–fold higher than that in control group. Certain extracellular polymeric substances (EPS) compounds that can act as electron shuttles, i.e. protein and humic substances, were greatly enriched with the existence of CMs. In particular, compared with control group, CMs supplemented groups had 2.3 and 10 to 20 folds low molecular weight protein in bound and soluble EPS, respectively. Carbon nanotube supplemented group exhibited 3 times higher humic substance in soluble EPS. The overall electron transport system activity in CMs groups was much higher than that in control groups. The addition of CMs enriched phenol degradation bacteria–Syntrophorhabdus, Brooklawnia, Treponema and Syntrophus, as well as electroactive methanogens–Methanosaeta. It is proposed that Syntrophus and Methanosaeta were the functional genera in methanogenic phenol degradation via extracellular electron transfer. This study revealed that the presence of CMs altered the EPS composition and microbial community of the system and made it become more favorable for extracellular electron transfer. Accepted version 2020-02-06T03:38:46Z 2020-02-06T03:38:46Z 2018 Journal Article Yan, W., Sun, F., Liu, J., & Zhou, Y. (2018). Enhanced anaerobic phenol degradation by conductive materials via EPS and microbial community alteration. Chemical Engineering Journal, 352, 1-9. doi:10.1016/j.cej.2018.06.187 1385-8947 https://hdl.handle.net/10356/136937 10.1016/j.cej.2018.06.187 2-s2.0-85049314513 352 1 9 en Chemical Engineering Journal © 2018 Elsevier B.V. All rights reserved. This paper was published in Chemical Engineering Journal and is made available with permission of Elsevier B.V. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Engineering::Environmental engineering
Phenol Degradation
Extracellular Polymeric Substances (EPS)
spellingShingle Engineering::Environmental engineering
Phenol Degradation
Extracellular Polymeric Substances (EPS)
Yan, Wangwang
Sun, Faqian
Liu, Jianbo
Zhou, Yan
Enhanced anaerobic phenol degradation by conductive materials via EPS and microbial community alteration
description Anaerobic biodegradation is a promising and economical process to remove phenol in the wastewater, although the reaction kinetics are often limited by the toxicity of phenol. This study proposed a strategy to accelerate phenol degradation and mitigate its inhibition on the bioprocess by adding conductive materials (CMs) into the anaerobic degradation system. The results showed that CMs could stimulate phenol degradation up to one–fold higher than that in control group. Certain extracellular polymeric substances (EPS) compounds that can act as electron shuttles, i.e. protein and humic substances, were greatly enriched with the existence of CMs. In particular, compared with control group, CMs supplemented groups had 2.3 and 10 to 20 folds low molecular weight protein in bound and soluble EPS, respectively. Carbon nanotube supplemented group exhibited 3 times higher humic substance in soluble EPS. The overall electron transport system activity in CMs groups was much higher than that in control groups. The addition of CMs enriched phenol degradation bacteria–Syntrophorhabdus, Brooklawnia, Treponema and Syntrophus, as well as electroactive methanogens–Methanosaeta. It is proposed that Syntrophus and Methanosaeta were the functional genera in methanogenic phenol degradation via extracellular electron transfer. This study revealed that the presence of CMs altered the EPS composition and microbial community of the system and made it become more favorable for extracellular electron transfer.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Yan, Wangwang
Sun, Faqian
Liu, Jianbo
Zhou, Yan
format Article
author Yan, Wangwang
Sun, Faqian
Liu, Jianbo
Zhou, Yan
author_sort Yan, Wangwang
title Enhanced anaerobic phenol degradation by conductive materials via EPS and microbial community alteration
title_short Enhanced anaerobic phenol degradation by conductive materials via EPS and microbial community alteration
title_full Enhanced anaerobic phenol degradation by conductive materials via EPS and microbial community alteration
title_fullStr Enhanced anaerobic phenol degradation by conductive materials via EPS and microbial community alteration
title_full_unstemmed Enhanced anaerobic phenol degradation by conductive materials via EPS and microbial community alteration
title_sort enhanced anaerobic phenol degradation by conductive materials via eps and microbial community alteration
publishDate 2020
url https://hdl.handle.net/10356/136937
_version_ 1681044554523869184