One-stage anaerobic fermentation of excess sludge for caproate production by supplementing chain elongation enrichments with ethanol as electron donor

Bo Fu; Yujie Lu; Hongbo Liu; Xuedong Zhang; Hale Ozgun; Mustafa Evren Ersahin; He Liu

doi:10.1016/j.jenvman.2022.116723

One-stage anaerobic fermentation of excess sludge for caproate production by supplementing chain elongation enrichments with ethanol as electron donor

Bo Fu, Yujie Lu, Hongbo Liu, Xuedong Zhang, Hale Ozgun, Mustafa Evren Ersahin, He Liu^*

^*Corresponding author for this work

Department of Environmental Engineering

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

Medium chain fatty acids (MCFAs) production from excess sludge have recently received great research interest due to higher energy densities, easy-separation capability and high economic benefits. Here, the addition of chain elongation (CE) enrichments with ethanol as electron donor was used to enhance caproate production from one-stage sludge fermentation. Compared with 0.20 g/L of controls, caproate production reached 9.00 g/L by supplementing CE enrichments with ethanol/acetate ratio of 3:1 after 7 days of acidification of organic matter in pretreated sludge fermentation. Clostridium_sensu_stricto_12, that refers to CE, was enriched in the first and second transfer of the sludge microbial consortium. Maintaining the stability of the microbial consortium would be the key that enables stable and efficient caproate production from sludge fermentation by supplementing CE enrichments.

Original language	English
Article number	116723
Journal	Journal of Environmental Management
Volume	326
DOIs	https://doi.org/10.1016/j.jenvman.2022.116723
Publication status	Published - 15 Jan 2023

Bibliographical note

Publisher Copyright:
© 2022 Elsevier Ltd

Funding

This research is supported by the Natural Science Foundation of Jiangsu Province ( BK20181344 ) and Jiangsu Collaboration Innovation Center of Technology and Material of Water Treatment ( XTCXSZ2022-15 ).

Funders	Funder number
Natural Science Foundation of Jiangsu Province	BK20181344
Collaborative Innovation Center for Water Treatment Technology and Materials	XTCXSZ2022-15

Keywords

Anaerobic fermentation
Bioaugmentation
Caproate
Chain elongation
Excess sludge

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10.1016/j.jenvman.2022.116723

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title = "One-stage anaerobic fermentation of excess sludge for caproate production by supplementing chain elongation enrichments with ethanol as electron donor",

abstract = "Medium chain fatty acids (MCFAs) production from excess sludge have recently received great research interest due to higher energy densities, easy-separation capability and high economic benefits. Here, the addition of chain elongation (CE) enrichments with ethanol as electron donor was used to enhance caproate production from one-stage sludge fermentation. Compared with 0.20 g/L of controls, caproate production reached 9.00 g/L by supplementing CE enrichments with ethanol/acetate ratio of 3:1 after 7 days of acidification of organic matter in pretreated sludge fermentation. Clostridium_sensu_stricto_12, that refers to CE, was enriched in the first and second transfer of the sludge microbial consortium. Maintaining the stability of the microbial consortium would be the key that enables stable and efficient caproate production from sludge fermentation by supplementing CE enrichments.",

keywords = "Anaerobic fermentation, Bioaugmentation, Caproate, Chain elongation, Excess sludge",

author = "Bo Fu and Yujie Lu and Hongbo Liu and Xuedong Zhang and Hale Ozgun and Ersahin, {Mustafa Evren} and He Liu",

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AU - Fu, Bo

AU - Lu, Yujie

AU - Liu, Hongbo

AU - Zhang, Xuedong

AU - Ozgun, Hale

AU - Ersahin, Mustafa Evren

AU - Liu, He

PY - 2023/1/15

Y1 - 2023/1/15

N2 - Medium chain fatty acids (MCFAs) production from excess sludge have recently received great research interest due to higher energy densities, easy-separation capability and high economic benefits. Here, the addition of chain elongation (CE) enrichments with ethanol as electron donor was used to enhance caproate production from one-stage sludge fermentation. Compared with 0.20 g/L of controls, caproate production reached 9.00 g/L by supplementing CE enrichments with ethanol/acetate ratio of 3:1 after 7 days of acidification of organic matter in pretreated sludge fermentation. Clostridium_sensu_stricto_12, that refers to CE, was enriched in the first and second transfer of the sludge microbial consortium. Maintaining the stability of the microbial consortium would be the key that enables stable and efficient caproate production from sludge fermentation by supplementing CE enrichments.

AB - Medium chain fatty acids (MCFAs) production from excess sludge have recently received great research interest due to higher energy densities, easy-separation capability and high economic benefits. Here, the addition of chain elongation (CE) enrichments with ethanol as electron donor was used to enhance caproate production from one-stage sludge fermentation. Compared with 0.20 g/L of controls, caproate production reached 9.00 g/L by supplementing CE enrichments with ethanol/acetate ratio of 3:1 after 7 days of acidification of organic matter in pretreated sludge fermentation. Clostridium_sensu_stricto_12, that refers to CE, was enriched in the first and second transfer of the sludge microbial consortium. Maintaining the stability of the microbial consortium would be the key that enables stable and efficient caproate production from sludge fermentation by supplementing CE enrichments.

KW - Anaerobic fermentation

KW - Bioaugmentation

KW - Caproate

KW - Chain elongation

KW - Excess sludge

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One-stage anaerobic fermentation of excess sludge for caproate production by supplementing chain elongation enrichments with ethanol as electron donor

Abstract

Bibliographical note

Funding

Keywords

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