Mechanisms of free nitrous acid and freezing co-pretreatment enhancing short-chain fatty acids production from waste activated sludge anaerobic fermentation

Wu, Y; Song, K; Sun, X; Ngo, HH; Guo, W; Nghiem, LD; Wang, Q

Mechanisms of free nitrous acid and freezing co-pretreatment enhancing short-chain fatty acids production from waste activated sludge anaerobic fermentation

Wu, Y Song, K Sun, X Ngo, HH

Guo, W

Nghiem, LD

Wang, Q

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Publication Type:: Journal Article
Citation:: Chemosphere, 2019, 230 pp. 536 - 543
Issue Date:: 2019-09-01

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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	Ngo, HH https://orcid.org/0000-0002-0296-2866	en_US
dc.contributor.author	Guo, W https://orcid.org/0000-0001-5542-2858	en_US
dc.contributor.author	Nghiem, LD https://orcid.org/0000-0002-9039-5792	en_US
dc.contributor.author	Wang, Q https://orcid.org/0000-0002-5744-2331	en_US
dc.date.available	2019-05-14	en_US
dc.date.issued	2019-09-01	en_US
dc.identifier.citation	Chemosphere, 2019, 230 pp. 536 - 543	en_US
dc.identifier.issn	0045-6535	en_US
dc.identifier.uri	http://hdl.handle.net/10453/135266
dc.description.abstract	© 2019 Elsevier Ltd Free nitrous acid (FNA) or freezing has been recently utilized as an efficient pretreatment method to increase short-chain fatty acids (SCFAs) yield from waste activated sludge (WAS) anaerobic fermentation (AF). But until now, the performances and mechanisms of the co-pretreatment for SCFAs production are unknown. This research aimed to investigate the AF mechanisms through studying its influence on sludge solubilization and related bioprocesses. WAS was pretreated for 48 h with FNA (1.07 mg N/L), freezing (−5 °C) and combination of FNA and freezing (0.53–2.13 mg N/L FNA at −5 °C), respectively, then conducted batch AF. Experimental results indicated that the optimal total SCFAs yield of 391.19 ± 5.54 mg COD/g VSS was achieved after 1.07 mg N/L FNA + freezing pretreatment at 9 days of AF, which was 2.2, 1.6 and 1.3-fold of the blank, freezing and FNA pretreated samples, respectively. The mechanisms analysis showed that co-pretreatment showed synergetic effects on sludge disintegration and solubilization, which could release more soluble substrates for SCFAs production. The co-pretreatment resulted in slight inhibition to hydrolysis and negligible inhibition to acidogenesis but severe inhibition to methanogenesis, maybe due to less endurance of methanogens.	en_US
dc.relation.ispartof	Chemosphere	en_US
dc.relation.isbasedon	10.1016/j.chemosphere.2019.05.107	en_US
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject.classification	Meteorology & Atmospheric Sciences	en_US
dc.subject.classification	Environmental Sciences	en_US
dc.subject.mesh	Nitrous Acid	en_US
dc.subject.mesh	Fatty Acids, Volatile	en_US
dc.subject.mesh	Sewage	en_US
dc.subject.mesh	Waste Disposal, Fluid	en_US
dc.subject.mesh	Anaerobiosis	en_US
dc.subject.mesh	Fermentation	en_US
dc.subject.mesh	Hydrolysis	en_US
dc.subject.mesh	Freezing	en_US
dc.title	Mechanisms of free nitrous acid and freezing co-pretreatment enhancing short-chain fatty acids production from waste activated sludge anaerobic fermentation	en_US
dc.type	Journal Article
utslib.citation.volume	230	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	open_access	*
utslib.copyright.embargo	2021-09-02T00:00:00+1000
pubs.publication-status	Published	en_US
pubs.volume	230	en_US

Abstract:

© 2019 Elsevier Ltd Free nitrous acid (FNA) or freezing has been recently utilized as an efficient pretreatment method to increase short-chain fatty acids (SCFAs) yield from waste activated sludge (WAS) anaerobic fermentation (AF). But until now, the performances and mechanisms of the co-pretreatment for SCFAs production are unknown. This research aimed to investigate the AF mechanisms through studying its influence on sludge solubilization and related bioprocesses. WAS was pretreated for 48 h with FNA (1.07 mg N/L), freezing (−5 °C) and combination of FNA and freezing (0.53–2.13 mg N/L FNA at −5 °C), respectively, then conducted batch AF. Experimental results indicated that the optimal total SCFAs yield of 391.19 ± 5.54 mg COD/g VSS was achieved after 1.07 mg N/L FNA + freezing pretreatment at 9 days of AF, which was 2.2, 1.6 and 1.3-fold of the blank, freezing and FNA pretreated samples, respectively. The mechanisms analysis showed that co-pretreatment showed synergetic effects on sludge disintegration and solubilization, which could release more soluble substrates for SCFAs production. The co-pretreatment resulted in slight inhibition to hydrolysis and negligible inhibition to acidogenesis but severe inhibition to methanogenesis, maybe due to less endurance of methanogens.

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http://hdl.handle.net/10453/135266