Enhanced Sludge Dewaterability by Efficient Oxidation of α-Mn<inf>2</inf>O<inf>3</inf>/Peroxymonosulfate: Analysis of the Mechanism and Evaluation of Engineering Application

Ding, A; Lin, W; Shi, H; Chen, R; Ngo, HH; He, X; Nan, J; Li, G; Ma, J

Enhanced Sludge Dewaterability by Efficient Oxidation of α-Mn<inf>2</inf>O<inf>3</inf>/Peroxymonosulfate: Analysis of the Mechanism and Evaluation of Engineering Application

Ding, A Lin, W Shi, H Chen, R Ngo, HH He, X Nan, J Li, G Ma, J

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Publisher:: American Chemical Society (ACS)
Publication Type:: Journal Article
Citation:: ACS ES and T Engineering, 2023, 3, (2), pp. 236-247
Issue Date:: 2023-02-10

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Field	Value	Language
dc.contributor.author	Ding, A
dc.contributor.author	Lin, W
dc.contributor.author	Shi, H
dc.contributor.author	Chen, R
dc.contributor.author	Ngo, HH
dc.contributor.author	He, X
dc.contributor.author	Nan, J
dc.contributor.author	Li, G
dc.contributor.author	Ma, J
dc.date.accessioned	2024-03-22T02:54:45Z
dc.date.available	2024-03-22T02:54:45Z
dc.date.issued	2023-02-10
dc.identifier.citation	ACS ES and T Engineering, 2023, 3, (2), pp. 236-247
dc.identifier.issn	2690-0645
dc.identifier.issn	2690-0645
dc.identifier.uri	http://hdl.handle.net/10453/177010
dc.description.abstract	Sludge dewatering reduces huge volumes of sludge, which can help save costs of subsequent sludge treatment and disposal. Extracellular polymeric substances (EPS) in sludge hinder the efficient removal of sludge water due to their strong hydrophilicity and water-holding capacity. In this study, we prepared a new type of α-Mn2O3 by the hydrothermal method and explored the effects of α-Mn2O3/peroxymonosulfate (PMS) on the properties of EPS and sludge dewaterability. Results confirmed that centrifuged weight reduction (CWR) increased from 87.5 to 94.7%, while water content (WC) decreased from 78.1 to 70.4%, under optimized additions of α-Mn2O3 and PMS, which were 0.12 mmol/g VSS and 0.18 mmol/g VSS, respectively. The mechanism investigations indicated that α-Mn2O3/PMS clearly degraded the EPS, destroyed their structure, and weakened their hydrophilicity and water-holding capacity, leading to much reduced intermolecular forces of EPS and the transformation of bound water to free water. Furthermore, we also ascertained the oxidized mechanism of α-Mn2O3/PMS on the degradation of EPS, and the pathway for generating reactive oxygen species (ROS) was also uncovered. Remarkably, SO4•- and •OH were the leading ROS on the degradation of EPS during oxidation with beyond 70% rate of contribution. Importantly, prepared α-Mn2O3 was compared with the standard Mn2O3 to verify the feasibility of applying it in practical engineering applications. This research has great significance for applying persulfate to enhance sludge dewaterability, which is expected to promote the wide application of manganese oxides (MnOx)/PMS in sludge reduction and dewatering.
dc.language	en
dc.publisher	American Chemical Society (ACS)
dc.relation.ispartof	ACS ES and T Engineering
dc.relation.isbasedon	10.1021/acsestengg.2c00286
dc.rights	info:eu-repo/semantics/closedAccess
dc.title	Enhanced Sludge Dewaterability by Efficient Oxidation of α-Mn<inf>2</inf>O<inf>3</inf>/Peroxymonosulfate: Analysis of the Mechanism and Evaluation of Engineering Application
dc.type	Journal Article
utslib.citation.volume	3
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	2024-03-22T02:54:40Z
pubs.issue	2
pubs.publication-status	Published
pubs.volume	3
utslib.citation.issue	2

Abstract:

Sludge dewatering reduces huge volumes of sludge, which can help save costs of subsequent sludge treatment and disposal. Extracellular polymeric substances (EPS) in sludge hinder the efficient removal of sludge water due to their strong hydrophilicity and water-holding capacity. In this study, we prepared a new type of α-Mn2O3 by the hydrothermal method and explored the effects of α-Mn2O3/peroxymonosulfate (PMS) on the properties of EPS and sludge dewaterability. Results confirmed that centrifuged weight reduction (CWR) increased from 87.5 to 94.7%, while water content (WC) decreased from 78.1 to 70.4%, under optimized additions of α-Mn2O3 and PMS, which were 0.12 mmol/g VSS and 0.18 mmol/g VSS, respectively. The mechanism investigations indicated that α-Mn2O3/PMS clearly degraded the EPS, destroyed their structure, and weakened their hydrophilicity and water-holding capacity, leading to much reduced intermolecular forces of EPS and the transformation of bound water to free water. Furthermore, we also ascertained the oxidized mechanism of α-Mn2O3/PMS on the degradation of EPS, and the pathway for generating reactive oxygen species (ROS) was also uncovered. Remarkably, SO4•- and •OH were the leading ROS on the degradation of EPS during oxidation with beyond 70% rate of contribution. Importantly, prepared α-Mn2O3 was compared with the standard Mn2O3 to verify the feasibility of applying it in practical engineering applications. This research has great significance for applying persulfate to enhance sludge dewaterability, which is expected to promote the wide application of manganese oxides (MnOx)/PMS in sludge reduction and dewatering.

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http://hdl.handle.net/10453/177010