Model-based evaluation of the impacts of aeration on tightly bound and loosely bound extracellular polymeric substance production under non-steady-state conditions.

Xing, L; Yang, J; Zhang, Y; Ni, B-J; Yang, C; Yuan, C; Li, A

Model-based evaluation of the impacts of aeration on tightly bound and loosely bound extracellular polymeric substance production under non-steady-state conditions.

Xing, L Yang, J Zhang, Y Ni, B-J Yang, C Yuan, C Li, A

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Publisher:: ELSEVIER
Publication Type:: Journal Article
Citation:: Sci Total Environ, 2022, 852, pp. 158566
Issue Date:: 2022-12-15

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Field	Value	Language
dc.contributor.author	Xing, L
dc.contributor.author	Yang, J
dc.contributor.author	Zhang, Y
dc.contributor.author	Ni, B-J
dc.contributor.author	Yang, C
dc.contributor.author	Yuan, C
dc.contributor.author	Li, A
dc.date.accessioned	2023-03-22T02:40:34Z
dc.date.available	2022-09-02
dc.date.available	2023-03-22T02:40:34Z
dc.date.issued	2022-12-15
dc.identifier.citation	Sci Total Environ, 2022, 852, pp. 158566
dc.identifier.issn	0048-9697
dc.identifier.issn	1879-1026
dc.identifier.uri	http://hdl.handle.net/10453/168045
dc.description.abstract	Tightly bound extracellular polymeric substances (TB-EPS) and loosely bound extracellular polymeric substances (LB-EPS) affect the flocculability and settleability of sludge and the transfer of oxygen, which are highly related to aeration. In this study, we systemically evaluated the expanded unified model-TL2.1 for its long-term simulation of TB-EPS and LB-EPS. Two different aeration conditions and three different influent carbon sources were used to evaluate the model, and the simulation results fit well with the experimental data. TB-EPS and LB-EPS production increased with aeration intensity. The influence of aeration parameters on TB-EPS and LB-EPS production in a short-term batch system and long-term sequencing batch reactor (SBR) system was compared. The aeration parameters included the total transfer coefficient (kLa) and the concentration of dissolved oxygen at the interface (CS). To ensure a high removal rate of substrates and ammonia nitrogen and achieve a stable active biomass concentration, the following aeration parameters can be adopted to reduce energy wastage during aeration: when CS is 2 mg/L, kLa can be set above 30 h-1 and below 50 h-1; when kLa is 50 h-1, CS can be set above 1 mg/L and below 1.5 mg/L. This study systematically revealed the influence of aeration on TB-EPS and LB-EPS formation in an SBR system through a mathematical model, and it provides a theoretical basis for better understanding aeration.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	ELSEVIER
dc.relation.ispartof	Sci Total Environ
dc.relation.isbasedon	10.1016/j.scitotenv.2022.158566
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Environmental Sciences
dc.subject.mesh	Extracellular Polymeric Substance Matrix
dc.subject.mesh	Sewage
dc.subject.mesh	Ammonia
dc.subject.mesh	Nitrogen
dc.subject.mesh	Carbon
dc.subject.mesh	Oxygen
dc.subject.mesh	Carbon
dc.subject.mesh	Oxygen
dc.subject.mesh	Nitrogen
dc.subject.mesh	Ammonia
dc.subject.mesh	Sewage
dc.subject.mesh	Extracellular Polymeric Substance Matrix
dc.subject.mesh	Extracellular Polymeric Substance Matrix
dc.subject.mesh	Sewage
dc.subject.mesh	Ammonia
dc.subject.mesh	Nitrogen
dc.subject.mesh	Carbon
dc.subject.mesh	Oxygen
dc.title	Model-based evaluation of the impacts of aeration on tightly bound and loosely bound extracellular polymeric substance production under non-steady-state conditions.
dc.type	Journal Article
utslib.citation.volume	852
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	2023-03-22T02:40:30Z
pubs.publication-status	Published
pubs.volume	852

Abstract:

Tightly bound extracellular polymeric substances (TB-EPS) and loosely bound extracellular polymeric substances (LB-EPS) affect the flocculability and settleability of sludge and the transfer of oxygen, which are highly related to aeration. In this study, we systemically evaluated the expanded unified model-TL2.1 for its long-term simulation of TB-EPS and LB-EPS. Two different aeration conditions and three different influent carbon sources were used to evaluate the model, and the simulation results fit well with the experimental data. TB-EPS and LB-EPS production increased with aeration intensity. The influence of aeration parameters on TB-EPS and LB-EPS production in a short-term batch system and long-term sequencing batch reactor (SBR) system was compared. The aeration parameters included the total transfer coefficient (kLa) and the concentration of dissolved oxygen at the interface (CS). To ensure a high removal rate of substrates and ammonia nitrogen and achieve a stable active biomass concentration, the following aeration parameters can be adopted to reduce energy wastage during aeration: when CS is 2 mg/L, kLa can be set above 30 h-1 and below 50 h-1; when kLa is 50 h-1, CS can be set above 1 mg/L and below 1.5 mg/L. This study systematically revealed the influence of aeration on TB-EPS and LB-EPS formation in an SBR system through a mathematical model, and it provides a theoretical basis for better understanding aeration.

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http://hdl.handle.net/10453/168045