In-depth research on percarbonate expediting zero-valent iron corrosion for conditioning anaerobically digested sludge

Li, Y; Wang, D; Yang, G; Yuan, X; Yuan, L; Li, Z; Xu, Q; Liu, X; Yang, Q; Tang, W; Jiang, L; Li, H; Wang, Q; Ni, B

In-depth research on percarbonate expediting zero-valent iron corrosion for conditioning anaerobically digested sludge

Li, Y Wang, D Yang, G Yuan, X Yuan, L Li, Z Xu, Q Liu, X Yang, Q Tang, W Jiang, L Li, H Wang, Q

Ni, B

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Journal of Hazardous Materials, 2021, 419, pp. 1-16
Issue Date:: 2021-06-01

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Field	Value	Language
dc.contributor.author	Li, Y
dc.contributor.author	Wang, D
dc.contributor.author	Yang, G
dc.contributor.author	Yuan, X
dc.contributor.author	Yuan, L
dc.contributor.author	Li, Z
dc.contributor.author	Xu, Q
dc.contributor.author	Liu, X
dc.contributor.author	Yang, Q
dc.contributor.author	Tang, W
dc.contributor.author	Jiang, L
dc.contributor.author	Li, H
dc.contributor.author	Wang, Q https://orcid.org/0000-0002-5744-2331
dc.contributor.author	Ni, B https://orcid.org/0000-0002-1129-7837
dc.date.accessioned	2022-04-13T01:51:22Z
dc.date.available	2021-06-08
dc.date.available	2022-04-13T01:51:22Z
dc.date.issued	2021-06-01
dc.identifier.citation	Journal of Hazardous Materials, 2021, 419, pp. 1-16
dc.identifier.issn	0304-3894
dc.identifier.issn	1873-3336
dc.identifier.uri	http://hdl.handle.net/10453/156173
dc.description.abstract	Anaerobically digested sludge (ADS) is commonly hard to dewater for the presence of extracellular polymeric substances (EPS) and the liberation of glutinous soluble microbic products during anaerobic digestion. Sodium percarbonate (SPC) expediting zero-valent iron (ZVI) corrosion (SPC/ZVI) process firstly conditioned ADS to amend its dewaterability. Results showed that SPC/ZVI conditioning decreased moisture content of dewatered cake from 90.5% (control) to 69.9% with addition of 0.10 g/g TS SPC and 0.20 g/g TS ZVI. Mechanistic research indicated that the enhanced ADS dewaterability mainly resulted from •OH and Fe(III)/iron polymers yielded in SPC/ZVI. •OH disrupted EPS, damaged cytoderm & cytomembrane, and lysed intracellular substances, unbinding the bound water. Meanwhile, the breakage and inactivation of microbe by •OH prompted the production of macro-pores in ADS. •OH adjusted the conformation of extracellular/intracellular proteins by intervening in the H-bonds and S-S bonds, availing the hydrophobicity and slight flocculation of ADS. •OH further facilitated the despiralization of α-helical to β-sheet structure in ADS pellets, benefiting cell-to-cell aggregation. Additionally, Fe(III)/iron polymers from ZVI corrosion accelerated to gather ADS and maintained its floc structure. Consequently, SPC/ZVI conditioning not only adjusted the natures of ADS and its EPS but also the features of residual pellets, which further induced the advancement of ADS dewaterability. In addition, SPC/ZVI conditioning possibly surmounts some limitations existing in ZVI/Peroxide or ZVI/Persulfate technique.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	Elsevier
dc.relation.ispartof	Journal of Hazardous Materials
dc.relation.isbasedon	10.1016/j.jhazmat.2021.126389
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	03 Chemical Sciences, 05 Environmental Sciences, 09 Engineering
dc.subject.classification	Strategic, Defence & Security Studies
dc.subject.mesh	Carbonates
dc.subject.mesh	Corrosion
dc.subject.mesh	Iron
dc.subject.mesh	Oxidation-Reduction
dc.subject.mesh	Sewage
dc.subject.mesh	Waste Disposal, Fluid
dc.subject.mesh	Carbonates
dc.subject.mesh	Iron
dc.subject.mesh	Sewage
dc.subject.mesh	Waste Disposal, Fluid
dc.subject.mesh	Oxidation-Reduction
dc.subject.mesh	Corrosion
dc.title	In-depth research on percarbonate expediting zero-valent iron corrosion for conditioning anaerobically digested sludge
dc.type	Journal Article
utslib.citation.volume	419
utslib.location.activity	Netherlands
utslib.for	03 Chemical Sciences
utslib.for	05 Environmental Sciences
utslib.for	09 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	*
pubs.consider-herdc	false
dc.date.updated	2022-04-13T01:50:50Z
pubs.publication-status	Published
pubs.volume	419

Abstract:

Anaerobically digested sludge (ADS) is commonly hard to dewater for the presence of extracellular polymeric substances (EPS) and the liberation of glutinous soluble microbic products during anaerobic digestion. Sodium percarbonate (SPC) expediting zero-valent iron (ZVI) corrosion (SPC/ZVI) process firstly conditioned ADS to amend its dewaterability. Results showed that SPC/ZVI conditioning decreased moisture content of dewatered cake from 90.5% (control) to 69.9% with addition of 0.10 g/g TS SPC and 0.20 g/g TS ZVI. Mechanistic research indicated that the enhanced ADS dewaterability mainly resulted from •OH and Fe(III)/iron polymers yielded in SPC/ZVI. •OH disrupted EPS, damaged cytoderm & cytomembrane, and lysed intracellular substances, unbinding the bound water. Meanwhile, the breakage and inactivation of microbe by •OH prompted the production of macro-pores in ADS. •OH adjusted the conformation of extracellular/intracellular proteins by intervening in the H-bonds and S-S bonds, availing the hydrophobicity and slight flocculation of ADS. •OH further facilitated the despiralization of α-helical to β-sheet structure in ADS pellets, benefiting cell-to-cell aggregation. Additionally, Fe(III)/iron polymers from ZVI corrosion accelerated to gather ADS and maintained its floc structure. Consequently, SPC/ZVI conditioning not only adjusted the natures of ADS and its EPS but also the features of residual pellets, which further induced the advancement of ADS dewaterability. In addition, SPC/ZVI conditioning possibly surmounts some limitations existing in ZVI/Peroxide or ZVI/Persulfate technique.

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http://hdl.handle.net/10453/156173