Enhanced short-chain fatty acids production from waste activated sludge by sophorolipid: Performance, mechanism, and implication

Xu, Q; Liu, X; Wang, D; Liu, Y; Wang, Q; Ni, BJ; Li, X; Yang, Q; Li, H

Enhanced short-chain fatty acids production from waste activated sludge by sophorolipid: Performance, mechanism, and implication

Xu, Q Liu, X Wang, D Liu, Y

Wang, Q

Ni, BJ

Li, X Yang, Q Li, H

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Publication Type:: Journal Article
Citation:: Bioresource Technology, 2019, 284 pp. 456 - 465
Issue Date:: 2019-07-01

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Field	Value	Language
dc.contributor.author	Xu, Q	en_US
dc.contributor.author	Liu, X	en_US
dc.contributor.author	Wang, D	en_US
dc.contributor.author	Liu, Y https://orcid.org/0000-0001-6677-7961	en_US
dc.contributor.author	Wang, Q https://orcid.org/0000-0002-5744-2331	en_US
dc.contributor.author	Ni, BJ https://orcid.org/0000-0002-1129-7837	en_US
dc.contributor.author	Li, X	en_US
dc.contributor.author	Yang, Q	en_US
dc.contributor.author	Li, H	en_US
dc.date.available	2019-03-23	en_US
dc.date.issued	2019-07-01	en_US
dc.identifier.citation	Bioresource Technology, 2019, 284 pp. 456 - 465	en_US
dc.identifier.issn	0960-8524	en_US
dc.identifier.uri	http://hdl.handle.net/10453/135229
dc.description.abstract	© 2019 Elsevier Ltd It was found in this study that the presence of sophorolipid (SL) enhanced the production of short-chain fatty acid (SCFA) from anaerobic fermentation of waste activated sludge (WAS). Experimental results showed that with an increase of SL addition from 0 to 0.1 g/g TSS, the maximal SCFA yield increased from 50.5 ± 4.9 to 246.2 ± 7.5 mg COD/g VSS. The presence of SL reduced the surface tension between hydrophobic organics and fermentation liquid, which thereby accelerated the disintegration of WAS and improved the biodegradability of the released organics. SL promoted the carbon/nitrogen ratio of the fermentation system, enhancing the conversion of proteins in WAS. Moreover, SL suppressed severely the activities of methanogens, probably due to the drop of pH caused by SL addition. Amplicon sequencing analyses revealed that SL increased the abundance of hydrolytic microbes such as Bacteroides sp. and Macellibacteroides sp., and SCFA producers (e.g., Acinetobacter sp.).	en_US
dc.relation.ispartof	Bioresource Technology	en_US
dc.relation.isbasedon	10.1016/j.biortech.2019.03.121	en_US
dc.subject.classification	Biotechnology	en_US
dc.subject.mesh	Carbon	en_US
dc.subject.mesh	Lipids	en_US
dc.subject.mesh	Fatty Acids, Volatile	en_US
dc.subject.mesh	Sewage	en_US
dc.subject.mesh	Fermentation	en_US
dc.subject.mesh	Hydrolysis	en_US
dc.subject.mesh	Hydrogen-Ion Concentration	en_US
dc.subject.mesh	Lipid Metabolism	en_US
dc.title	Enhanced short-chain fatty acids production from waste activated sludge by sophorolipid: Performance, mechanism, and implication	en_US
dc.type	Journal Article
utslib.citation.volume	284	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	284	en_US

Abstract:

© 2019 Elsevier Ltd It was found in this study that the presence of sophorolipid (SL) enhanced the production of short-chain fatty acid (SCFA) from anaerobic fermentation of waste activated sludge (WAS). Experimental results showed that with an increase of SL addition from 0 to 0.1 g/g TSS, the maximal SCFA yield increased from 50.5 ± 4.9 to 246.2 ± 7.5 mg COD/g VSS. The presence of SL reduced the surface tension between hydrophobic organics and fermentation liquid, which thereby accelerated the disintegration of WAS and improved the biodegradability of the released organics. SL promoted the carbon/nitrogen ratio of the fermentation system, enhancing the conversion of proteins in WAS. Moreover, SL suppressed severely the activities of methanogens, probably due to the drop of pH caused by SL addition. Amplicon sequencing analyses revealed that SL increased the abundance of hydrolytic microbes such as Bacteroides sp. and Macellibacteroides sp., and SCFA producers (e.g., Acinetobacter sp.).

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http://hdl.handle.net/10453/135229