Fate of organic fractions of greywater in combined process of vacuum-ultraviolet (VUV/UV)/ozone pre-oxidation with enhanced coagulation

Li, H; Yang, Y; Ren, J; Zhou, Z; Li, X; Liu, Y; Feng, J

Fate of organic fractions of greywater in combined process of vacuum-ultraviolet (VUV/UV)/ozone pre-oxidation with enhanced coagulation

Li, H Yang, Y Ren, J Zhou, Z Li, X Liu, Y Feng, J

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Journal of Environmental Chemical Engineering, 2022, 10, (3), pp. 107417
Issue Date:: 2022-06-01

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Field	Value	Language
dc.contributor.author	Li, H
dc.contributor.author	Yang, Y
dc.contributor.author	Ren, J
dc.contributor.author	Zhou, Z
dc.contributor.author	Li, X
dc.contributor.author	Liu, Y
dc.contributor.author	Feng, J
dc.date.accessioned	2023-04-10T23:50:25Z
dc.date.available	2023-04-10T23:50:25Z
dc.date.issued	2022-06-01
dc.identifier.citation	Journal of Environmental Chemical Engineering, 2022, 10, (3), pp. 107417
dc.identifier.issn	2213-2929
dc.identifier.issn	2213-3437
dc.identifier.uri	http://hdl.handle.net/10453/169448
dc.description.abstract	Pre-ozonation is often used as an effective method to assist coagulation in removing organic contaminants. In this study, a new process that combining ozone (O3) with vacuum ultraviolet (VUV/UV) process (VUV/UV/O3) is investigated to enhance the removal of organic matters in greywater from public buildings or household. The influence of organic characteristics (molecular weight distribution, hydrophobicity, and fluorescence) in greywater on VUV/UV/O3 enhanced coagulation has not been fully studied. Herein, organic matters of greywater were separated and classified, and fates of organic fractions by VUV/UV/O3 enhanced coagulation were clarified. Greywater contains tryptophan-like and tyrosine-like proteins, and terrestrially derived humic-like substances. The highest UV254, LAS, DOC and CODCr removal efficiency from greywater could reach up to 47.54%, 58.92%, 17.96% and 15.76% in VUV/UV/O3 enhanced coagulation, respectively. The removal efficiency of tryptophan-like and tyrosine-like in filtrates of varied molecular weight ranges by VUV/UV/O3 enhanced coagulation was 93.59%-98.13% and 89.86%-95.53%, respectively. VUV/UV/O3 enhanced coagulation was effective for the removal of bio-polymers, humic substances and low molecular weight acid ? 30 kDa, while it was insignificant for that of 0.22 ?m - 100 kDa. Particle size of flocs increased significantly in filtrates obtained from increasing membrane pore size, indicating that macromolecular organic matter was more likely to form flocs. Finally, the VUV/UV/O3 could improve coagulation on the removal of varied organic pollutants and improve sedimentation by changing the flaky flocs to dense ones. Therefore, the results demonstrate VUV/UV/O3 is an effective pre-oxidation method to enhance the effect of coagulation on greywater treatment.
dc.language	en
dc.publisher	Elsevier
dc.relation.ispartof	Journal of Environmental Chemical Engineering
dc.relation.isbasedon	10.1016/j.jece.2022.107417
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0306 Physical Chemistry (incl. Structural), 0904 Chemical Engineering, 0907 Environmental Engineering
dc.title	Fate of organic fractions of greywater in combined process of vacuum-ultraviolet (VUV/UV)/ozone pre-oxidation with enhanced coagulation
dc.type	Journal Article
utslib.citation.volume	10
utslib.for	0306 Physical Chemistry (incl. Structural)
utslib.for	0904 Chemical 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
utslib.copyright.status	closed_access	*
dc.date.updated	2023-04-10T23:50:23Z
pubs.issue	3
pubs.publication-status	Published
pubs.volume	10
utslib.citation.issue	3

Abstract:

Pre-ozonation is often used as an effective method to assist coagulation in removing organic contaminants. In this study, a new process that combining ozone (O3) with vacuum ultraviolet (VUV/UV) process (VUV/UV/O3) is investigated to enhance the removal of organic matters in greywater from public buildings or household. The influence of organic characteristics (molecular weight distribution, hydrophobicity, and fluorescence) in greywater on VUV/UV/O3 enhanced coagulation has not been fully studied. Herein, organic matters of greywater were separated and classified, and fates of organic fractions by VUV/UV/O3 enhanced coagulation were clarified. Greywater contains tryptophan-like and tyrosine-like proteins, and terrestrially derived humic-like substances. The highest UV254, LAS, DOC and CODCr removal efficiency from greywater could reach up to 47.54%, 58.92%, 17.96% and 15.76% in VUV/UV/O3 enhanced coagulation, respectively. The removal efficiency of tryptophan-like and tyrosine-like in filtrates of varied molecular weight ranges by VUV/UV/O3 enhanced coagulation was 93.59%-98.13% and 89.86%-95.53%, respectively. VUV/UV/O3 enhanced coagulation was effective for the removal of bio-polymers, humic substances and low molecular weight acid ? 30 kDa, while it was insignificant for that of 0.22 ?m - 100 kDa. Particle size of flocs increased significantly in filtrates obtained from increasing membrane pore size, indicating that macromolecular organic matter was more likely to form flocs. Finally, the VUV/UV/O3 could improve coagulation on the removal of varied organic pollutants and improve sedimentation by changing the flaky flocs to dense ones. Therefore, the results demonstrate VUV/UV/O3 is an effective pre-oxidation method to enhance the effect of coagulation on greywater treatment.

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