Effects of free nitrous acid and freezing co-pretreatment on sludge short-chain fatty acids production and dewaterability

Wu, Y; Song, K; Sun, X; Li, L; Wang, W; Wang, Q; Wang, D

Effects of free nitrous acid and freezing co-pretreatment on sludge short-chain fatty acids production and dewaterability

Wu, Y Song, K Sun, X Li, L Wang, W Wang, Q

Wang, D

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Publication Type:: Journal Article
Citation:: Science of the Total Environment, 2019, 669 pp. 600 - 607
Issue Date:: 2019-06-15

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Field	Value	Language
dc.contributor.author	Wu, Y	en_US
dc.contributor.author	Song, K	en_US
dc.contributor.author	Sun, X	en_US
dc.contributor.author	Li, L	en_US
dc.contributor.author	Wang, W	en_US
dc.contributor.author	Wang, Q https://orcid.org/0000-0002-5744-2331	en_US
dc.contributor.author	Wang, D	en_US
dc.date.available	2019-03-12	en_US
dc.date.issued	2019-06-15	en_US
dc.identifier.citation	Science of the Total Environment, 2019, 669 pp. 600 - 607	en_US
dc.identifier.issn	0048-9697	en_US
dc.identifier.uri	http://hdl.handle.net/10453/138781
dc.description.abstract	© 2019 Elsevier B.V. Short-chain fatty acids (SCFAs) as recoverable carbon source from waste activated sludge anaerobic fermentation process have aroused wide concern. In this study, free nitrous acid (FNA) and freezing pretreatments were combined to enhance SCFAs yield and fermented sludge dewaterability in the anaerobic fermentation system. The effects of different FNA concentrations and different freezing conditions (with or without curing stages) were analysed and compared. The results indicated that combining 1.07 mg N/L FNA with 48 h continuous freezing at −5 °C, raised SCFAs production from 6.7 mg COD/g volatile suspended solids (VSS) for the blank (no pretreatment) up to 124.0 mg COD/g VSS. In addition, the minimal water content of the treated fermented sludge cake was 78.11%, which was less than that of the blank (81.22%). SCFAs production and dewaterability enhancement could be attributed to sludge disintegration induced by the co-pretreatment, which led to sludge solubilisation, organics release, methanogenesis inhibition and particle size variation. This study implied that FNA and freezing co-pretreatment has the potential to enhance SCFAs production and sludge dewaterability in wastewater treatment plants.	en_US
dc.relation.ispartof	Science of the Total Environment	en_US
dc.relation.isbasedon	10.1016/j.scitotenv.2019.03.175	en_US
dc.subject.classification	Environmental Sciences	en_US
dc.subject.mesh	Nitrous Acid	en_US
dc.subject.mesh	Carbon	en_US
dc.subject.mesh	Methane	en_US
dc.subject.mesh	Fatty Acids, Volatile	en_US
dc.subject.mesh	Bioreactors	en_US
dc.subject.mesh	Sewage	en_US
dc.subject.mesh	Waste Disposal, Fluid	en_US
dc.subject.mesh	Fermentation	en_US
dc.subject.mesh	Hydrolysis	en_US
dc.subject.mesh	Freezing	en_US
dc.subject.mesh	Waste Water	en_US
dc.title	Effects of free nitrous acid and freezing co-pretreatment on sludge short-chain fatty acids production and dewaterability	en_US
dc.type	Journal Article
utslib.citation.volume	669	en_US
utslib.for	0907 Environmental Engineering	en_US
utslib.for	0502 Environmental Science and Management	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	669	en_US

Abstract:

© 2019 Elsevier B.V. Short-chain fatty acids (SCFAs) as recoverable carbon source from waste activated sludge anaerobic fermentation process have aroused wide concern. In this study, free nitrous acid (FNA) and freezing pretreatments were combined to enhance SCFAs yield and fermented sludge dewaterability in the anaerobic fermentation system. The effects of different FNA concentrations and different freezing conditions (with or without curing stages) were analysed and compared. The results indicated that combining 1.07 mg N/L FNA with 48 h continuous freezing at −5 °C, raised SCFAs production from 6.7 mg COD/g volatile suspended solids (VSS) for the blank (no pretreatment) up to 124.0 mg COD/g VSS. In addition, the minimal water content of the treated fermented sludge cake was 78.11%, which was less than that of the blank (81.22%). SCFAs production and dewaterability enhancement could be attributed to sludge disintegration induced by the co-pretreatment, which led to sludge solubilisation, organics release, methanogenesis inhibition and particle size variation. This study implied that FNA and freezing co-pretreatment has the potential to enhance SCFAs production and sludge dewaterability in wastewater treatment plants.

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http://hdl.handle.net/10453/138781