Mechanism and kinetics of biofilm growth process influenced by shear stress in sewers.

Ai, H; Xu, J; Huang, W; He, Q; Ni, B; Wang, Y

Mechanism and kinetics of biofilm growth process influenced by shear stress in sewers.

Ai, H Xu, J Huang, W He, Q Ni, B

Wang, Y

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Publisher:: IWA PUBLISHING
Publication Type:: Journal Article
Citation:: Water Sci Technol, 2016, 73, (7), pp. 1572-1582
Issue Date:: 2016

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Field	Value	Language
dc.contributor.author	Ai, H
dc.contributor.author	Xu, J
dc.contributor.author	Huang, W
dc.contributor.author	He, Q
dc.contributor.author	Ni, B https://orcid.org/0000-0002-1129-7837
dc.contributor.author	Wang, Y
dc.date.accessioned	2022-07-20T01:29:25Z
dc.date.available	2022-07-20T01:29:25Z
dc.date.issued	2016
dc.identifier.citation	Water Sci Technol, 2016, 73, (7), pp. 1572-1582
dc.identifier.issn	0273-1223
dc.identifier.issn	1996-9732
dc.identifier.uri	http://hdl.handle.net/10453/159056
dc.description.abstract	Sewer biofilms play an important role in the biotransformation of substances for methane and sulfide emission in sewer networks. The dynamic flows and the particular shear stress in sewers are the key factors determining the growth of the sewer biofilm. In this work, the development of sewer biofilm with varying shear stress is specifically investigated to gain a comprehensive understanding of the sewer biofilm dynamics. Sewer biofilms were cultivated in laboratory-scale gravity sewers under different hydraulic conditions with the corresponding shell stresses are 1.12 Pa, 1.29 Pa and 1.45 Pa, respectively. The evolution of the biofilm thickness were monitored using microelectrodes, and the variation in total solids (TS) and extracellular polymer substance (EPS) levels in the biofilm were also measured. The results showed that the steady-state biofilm thickness were highly related to the corresponding shear stresses with the biofilm thickness of 2.4 ± 0.1 mm, 2.7 ± 0.1 mm and 2.2 ± 0.1 mm at shear stresses of 1.12 Pa, 1.29 Pa and 1.45 Pa, respectively, which the chemical oxygen demand concentration is 400 mg/L approximately. Based on these observations, a kinetic model for describing the development of sewer biofilms was developed and demonstrated to be capable of reproducing all the experimental data.
dc.format	Print
dc.language	eng
dc.publisher	IWA PUBLISHING
dc.relation	http://purl.org/au-research/grants/arc/DE130100451
dc.relation.ispartof	Water Sci Technol
dc.relation.isbasedon	10.2166/wst.2015.633
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Environmental Engineering
dc.subject.mesh	Bacteria
dc.subject.mesh	Biofilms
dc.subject.mesh	Bioreactors
dc.subject.mesh	Kinetics
dc.subject.mesh	Models, Theoretical
dc.subject.mesh	Sanitary Engineering
dc.subject.mesh	Stress, Mechanical
dc.subject.mesh	Time Factors
dc.subject.mesh	Bacteria
dc.subject.mesh	Biofilms
dc.subject.mesh	Bioreactors
dc.subject.mesh	Sanitary Engineering
dc.subject.mesh	Kinetics
dc.subject.mesh	Stress, Mechanical
dc.subject.mesh	Models, Theoretical
dc.subject.mesh	Time Factors
dc.title	Mechanism and kinetics of biofilm growth process influenced by shear stress in sewers.
dc.type	Journal Article
utslib.citation.volume	73
utslib.location.activity	England
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	2022-07-20T01:29:23Z
pubs.issue	7
pubs.publication-status	Published
pubs.volume	73
utslib.citation.issue	7

Abstract:

Sewer biofilms play an important role in the biotransformation of substances for methane and sulfide emission in sewer networks. The dynamic flows and the particular shear stress in sewers are the key factors determining the growth of the sewer biofilm. In this work, the development of sewer biofilm with varying shear stress is specifically investigated to gain a comprehensive understanding of the sewer biofilm dynamics. Sewer biofilms were cultivated in laboratory-scale gravity sewers under different hydraulic conditions with the corresponding shell stresses are 1.12 Pa, 1.29 Pa and 1.45 Pa, respectively. The evolution of the biofilm thickness were monitored using microelectrodes, and the variation in total solids (TS) and extracellular polymer substance (EPS) levels in the biofilm were also measured. The results showed that the steady-state biofilm thickness were highly related to the corresponding shear stresses with the biofilm thickness of 2.4 ± 0.1 mm, 2.7 ± 0.1 mm and 2.2 ± 0.1 mm at shear stresses of 1.12 Pa, 1.29 Pa and 1.45 Pa, respectively, which the chemical oxygen demand concentration is 400 mg/L approximately. Based on these observations, a kinetic model for describing the development of sewer biofilms was developed and demonstrated to be capable of reproducing all the experimental data.

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http://hdl.handle.net/10453/159056