A novel strategy for efficiently transforming waste activated sludge into medium-chain fatty acid using free nitrous acid.

Wang, C; Wang, Y; Chen, Z; Wei, W; Chen, X; Mannina, G; Ni, B-J

A novel strategy for efficiently transforming waste activated sludge into medium-chain fatty acid using free nitrous acid.

Wang, C Wang, Y Chen, Z

Wei, W

Chen, X Mannina, G Ni, B-J

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Sci Total Environ, 2023, 862, pp. 160826
Issue Date:: 2023-03-01

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Field	Value	Language
dc.contributor.author	Wang, C
dc.contributor.author	Wang, Y
dc.contributor.author	Chen, Z https://orcid.org/0000-0003-0627-0856
dc.contributor.author	Wei, W https://orcid.org/0000-0001-5613-337X
dc.contributor.author	Chen, X
dc.contributor.author	Mannina, G
dc.contributor.author	Ni, B-J
dc.date.accessioned	2023-03-17T04:30:05Z
dc.date.available	2022-12-06
dc.date.available	2023-03-17T04:30:05Z
dc.date.issued	2023-03-01
dc.identifier.citation	Sci Total Environ, 2023, 862, pp. 160826
dc.identifier.issn	0048-9697
dc.identifier.issn	1879-1026
dc.identifier.uri	http://hdl.handle.net/10453/167466
dc.description.abstract	The global energy crisis is approaching due to rapid population growth and overexploitation of fossil fuels. Therefore, the development and use of new and renewable energy sources is already in the extreme urgency. This work developed a novel technology to efficiently produce renewable liquid bioenergy from discarded wastes, by effectively transforming sewage sludge into high-value medium chain fatty acids (MCFA). The maximum MCFA yield in the anaerobic sludge fermentation was revealed to be 10.6 times of control when utilizing sewage sludge with 1.78 mg-N/L free nitrous acid (FNA) pretreatment. The carbon flow from sewage sludge into MCFA in the fermentation system was significantly enhanced with appropriate levels (0.71-1.78 mg-N/L) of FNA pretreatment. Compared to FNA pretreatment, however, its direct addition severely inhibited total products (i.e., carboxylates and complex alcohols) generation because of the toxicity on live cells (decreasing to 8.3 %-13.9 %) in sludge. Kinetic models (one-substrate and two-substrate) were utilized to investigate the mechanism of MCFA promotion by FNA pretreatment on anaerobic sludge fermentation, in which linear relationship analysis between FNA-derived organic release and the fitted parameters were also performed. The results indicated that the conversion of refractory materials into rapidly bioavailable substrates for MCFA production contributed to increasing MCFA production rate and potential. Moreover, the relative abundances of functional microorganisms related to hydrolysis-acidification and chain elongation process increased under FNA pretreatment, further favoring the MCFA production. This study provides a novel and effective technology of sludge energy recovery that can achieve the next-generation sustainable sewage sludge management.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	Elsevier
dc.relation	http://purl.org/au-research/grants/arc/DP220101139
dc.relation	http://purl.org/au-research/grants/arc/DE220100530
dc.relation.ispartof	Sci Total Environ
dc.relation.isbasedon	10.1016/j.scitotenv.2022.160826
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Environmental Sciences
dc.subject.mesh	Sewage
dc.subject.mesh	Nitrous Acid
dc.subject.mesh	Fatty Acids, Volatile
dc.subject.mesh	Fatty Acids
dc.subject.mesh	Fermentation
dc.subject.mesh	Anaerobiosis
dc.subject.mesh	Nitrous Acid
dc.subject.mesh	Fatty Acids
dc.subject.mesh	Fatty Acids, Volatile
dc.subject.mesh	Sewage
dc.subject.mesh	Anaerobiosis
dc.subject.mesh	Fermentation
dc.subject.mesh	Sewage
dc.subject.mesh	Nitrous Acid
dc.subject.mesh	Fatty Acids, Volatile
dc.subject.mesh	Fatty Acids
dc.subject.mesh	Fermentation
dc.subject.mesh	Anaerobiosis
dc.title	A novel strategy for efficiently transforming waste activated sludge into medium-chain fatty acid using free nitrous acid.
dc.type	Journal Article
utslib.citation.volume	862
utslib.location.activity	Netherlands
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	*
dc.date.updated	2023-03-17T04:30:03Z
pubs.publication-status	Published
pubs.volume	862

Abstract:

The global energy crisis is approaching due to rapid population growth and overexploitation of fossil fuels. Therefore, the development and use of new and renewable energy sources is already in the extreme urgency. This work developed a novel technology to efficiently produce renewable liquid bioenergy from discarded wastes, by effectively transforming sewage sludge into high-value medium chain fatty acids (MCFA). The maximum MCFA yield in the anaerobic sludge fermentation was revealed to be 10.6 times of control when utilizing sewage sludge with 1.78 mg-N/L free nitrous acid (FNA) pretreatment. The carbon flow from sewage sludge into MCFA in the fermentation system was significantly enhanced with appropriate levels (0.71-1.78 mg-N/L) of FNA pretreatment. Compared to FNA pretreatment, however, its direct addition severely inhibited total products (i.e., carboxylates and complex alcohols) generation because of the toxicity on live cells (decreasing to 8.3 %-13.9 %) in sludge. Kinetic models (one-substrate and two-substrate) were utilized to investigate the mechanism of MCFA promotion by FNA pretreatment on anaerobic sludge fermentation, in which linear relationship analysis between FNA-derived organic release and the fitted parameters were also performed. The results indicated that the conversion of refractory materials into rapidly bioavailable substrates for MCFA production contributed to increasing MCFA production rate and potential. Moreover, the relative abundances of functional microorganisms related to hydrolysis-acidification and chain elongation process increased under FNA pretreatment, further favoring the MCFA production. This study provides a novel and effective technology of sludge energy recovery that can achieve the next-generation sustainable sewage sludge management.

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http://hdl.handle.net/10453/167466