Effect of free nitrous acid pre-treatment on primary sludge biodegradability and its implications

Zhang, T; Wang, Q; Ye, L; Yuan, Z

Effect of free nitrous acid pre-treatment on primary sludge biodegradability and its implications

Zhang, T Wang, Q

Ye, L Yuan, Z

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Publisher:: ELSEVIER SCIENCE SA
Publication Type:: Journal Article
Citation:: Chemical Engineering Journal, 2016, 290, pp. 31-36
Issue Date:: 2016-04-15

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Field	Value	Language
dc.contributor.author	Zhang, T
dc.contributor.author	Wang, Q https://orcid.org/0000-0002-5744-2331
dc.contributor.author	Ye, L
dc.contributor.author	Yuan, Z
dc.date.accessioned	2022-08-03T03:12:15Z
dc.date.available	2022-08-03T03:12:15Z
dc.date.issued	2016-04-15
dc.identifier.citation	Chemical Engineering Journal, 2016, 290, pp. 31-36
dc.identifier.issn	1385-8947
dc.identifier.issn	1873-3212
dc.identifier.uri	http://hdl.handle.net/10453/159529
dc.description.abstract	Free nitrous acid (FNA i.e. HNO2) pre-treatment has been demonstrated to be effective in enhancing methane production from waste activated sludge (WAS). In some wastewater treatment plants (WWTPs), primary sludge (PS) and WAS are commonly mixed and digested simultaneously in the anaerobic digester. In order to reveal whether and how the PS and WAS should be jointly treated by FNA in WWTPs, this study presents the effects and mechanisms of FNA pre-treatment on methane production from PS. Full-scale derived PS was pre-treated with FNA at concentrations of 0-3.85mgN/L followed by biochemical methane potential (BMP) tests. FNA treated PS was centrifuged to separate the supernatant from the solid phase for BMP tests on both fractions. FNA pre-treatment resulted in the methane potential reduction of 1-7%. The methane production from both supernatant and solid phases also decreased. PS solubilisation in combination with the molecular weight distribution and chemical structure analysis of the soluble phase showed very limited release of readily biodegradable substances from PS with FNA pre-treatment. The fact that FNA pre-treatment compromised the methane production from PS indicates that FNA-based sludge pre-treatment technology should implemented solely on WAS to maximise the methane production from the two sludge streams.
dc.language	English
dc.publisher	ELSEVIER SCIENCE SA
dc.relation.ispartof	Chemical Engineering Journal
dc.relation.isbasedon	10.1016/j.cej.2016.01.028
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0904 Chemical Engineering, 0905 Civil Engineering, 0907 Environmental Engineering
dc.subject.classification	Chemical Engineering
dc.title	Effect of free nitrous acid pre-treatment on primary sludge biodegradability and its implications
dc.type	Journal Article
utslib.citation.volume	290
utslib.for	0904 Chemical Engineering
utslib.for	0905 Civil Engineering
utslib.for	0907 Environmental Engineering
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	2022-08-03T03:12:14Z
pubs.publication-status	Published
pubs.volume	290

Abstract:

Free nitrous acid (FNA i.e. HNO2) pre-treatment has been demonstrated to be effective in enhancing methane production from waste activated sludge (WAS). In some wastewater treatment plants (WWTPs), primary sludge (PS) and WAS are commonly mixed and digested simultaneously in the anaerobic digester. In order to reveal whether and how the PS and WAS should be jointly treated by FNA in WWTPs, this study presents the effects and mechanisms of FNA pre-treatment on methane production from PS. Full-scale derived PS was pre-treated with FNA at concentrations of 0-3.85mgN/L followed by biochemical methane potential (BMP) tests. FNA treated PS was centrifuged to separate the supernatant from the solid phase for BMP tests on both fractions. FNA pre-treatment resulted in the methane potential reduction of 1-7%. The methane production from both supernatant and solid phases also decreased. PS solubilisation in combination with the molecular weight distribution and chemical structure analysis of the soluble phase showed very limited release of readily biodegradable substances from PS with FNA pre-treatment. The fact that FNA pre-treatment compromised the methane production from PS indicates that FNA-based sludge pre-treatment technology should implemented solely on WAS to maximise the methane production from the two sludge streams.

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http://hdl.handle.net/10453/159529