Comparison of inactivation characteristics between Gram-positive and Gram-negative bacteria in water by synergistic UV and chlorine disinfection.

Chen, X; Chen, Z; Ngo, HH; Mao, Y; Cao, K; Shi, Q; Lu, Y; Hu, H-Y

Comparison of inactivation characteristics between Gram-positive and Gram-negative bacteria in water by synergistic UV and chlorine disinfection.

Chen, X Chen, Z Ngo, HH Mao, Y Cao, K Shi, Q Lu, Y Hu, H-Y

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Environ Pollut, 2023, 333, pp. 122007
Issue Date:: 2023-09-15

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Field	Value	Language
dc.contributor.author	Chen, X
dc.contributor.author	Chen, Z
dc.contributor.author	Ngo, HH
dc.contributor.author	Mao, Y
dc.contributor.author	Cao, K
dc.contributor.author	Shi, Q
dc.contributor.author	Lu, Y
dc.contributor.author	Hu, H-Y
dc.date.accessioned	2024-03-11T02:11:36Z
dc.date.available	2023-06-08
dc.date.available	2024-03-11T02:11:36Z
dc.date.issued	2023-09-15
dc.identifier.citation	Environ Pollut, 2023, 333, pp. 122007
dc.identifier.issn	0269-7491
dc.identifier.issn	1873-6424
dc.identifier.uri	http://hdl.handle.net/10453/176446
dc.description.abstract	Disinfection is essential in water and wastewater treatment process as a guarantee for microbial safety. This study systematically investigated: (i) the inactivation characteristics of bacteria widely existed in water, including Gram-negative bacteria (Escherichiacoli) and Gram-positive bacteria (Staphylococcus aureus and Bacillus subtilis spores), by sequential UV and chlorine disinfection processes (UV-Cl and Cl-UV), simultaneous UV and chlorine disinfection process (UV/Cl); and (ii) the disinfection mechanisms on different bacteria. The combination of UV and chlorine disinfection could inactive bacteria at lower doses, but showed no synergistic effect on E. coli. Contrarily, disinfection results indicated that UV/Cl performed an obvious synergistic effect on highly disinfectant-resistant bacteria (e.g. S. aureus and B. subtilis spores). Specifically, UV/Cl at the UV dose of 9 mJ/cm2 and chlorine dose of 2 mg-Cl/L could inactivate S. aureus completely. Moreover, the effectiveness of UV/Cl on the removal of indigenous bacteria in actual water conditions was also confirmed. In short, the study provides significant theoretical and practical implications for ensuring microbial safety during water treatment and use.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	Elsevier
dc.relation.ispartof	Environ Pollut
dc.relation.isbasedon	10.1016/j.envpol.2023.122007
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Environmental Sciences
dc.subject.mesh	Disinfection
dc.subject.mesh	Chlorine
dc.subject.mesh	Anti-Bacterial Agents
dc.subject.mesh	Escherichia coli
dc.subject.mesh	Staphylococcus aureus
dc.subject.mesh	Gram-Negative Bacteria
dc.subject.mesh	Gram-Positive Bacteria
dc.subject.mesh	Bacteria
dc.subject.mesh	Water Purification
dc.subject.mesh	Ultraviolet Rays
dc.subject.mesh	Bacteria
dc.subject.mesh	Gram-Negative Bacteria
dc.subject.mesh	Escherichia coli
dc.subject.mesh	Gram-Positive Bacteria
dc.subject.mesh	Staphylococcus aureus
dc.subject.mesh	Chlorine
dc.subject.mesh	Anti-Bacterial Agents
dc.subject.mesh	Ultraviolet Rays
dc.subject.mesh	Disinfection
dc.subject.mesh	Water Purification
dc.subject.mesh	Disinfection
dc.subject.mesh	Chlorine
dc.subject.mesh	Anti-Bacterial Agents
dc.subject.mesh	Escherichia coli
dc.subject.mesh	Staphylococcus aureus
dc.subject.mesh	Gram-Negative Bacteria
dc.subject.mesh	Gram-Positive Bacteria
dc.subject.mesh	Bacteria
dc.subject.mesh	Water Purification
dc.subject.mesh	Ultraviolet Rays
dc.title	Comparison of inactivation characteristics between Gram-positive and Gram-negative bacteria in water by synergistic UV and chlorine disinfection.
dc.type	Journal Article
utslib.citation.volume	333
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	2024-03-11T02:11:35Z
pubs.publication-status	Published
pubs.volume	333

Abstract:

Disinfection is essential in water and wastewater treatment process as a guarantee for microbial safety. This study systematically investigated: (i) the inactivation characteristics of bacteria widely existed in water, including Gram-negative bacteria (Escherichiacoli) and Gram-positive bacteria (Staphylococcus aureus and Bacillus subtilis spores), by sequential UV and chlorine disinfection processes (UV-Cl and Cl-UV), simultaneous UV and chlorine disinfection process (UV/Cl); and (ii) the disinfection mechanisms on different bacteria. The combination of UV and chlorine disinfection could inactive bacteria at lower doses, but showed no synergistic effect on E. coli. Contrarily, disinfection results indicated that UV/Cl performed an obvious synergistic effect on highly disinfectant-resistant bacteria (e.g. S. aureus and B. subtilis spores). Specifically, UV/Cl at the UV dose of 9 mJ/cm2 and chlorine dose of 2 mg-Cl/L could inactivate S. aureus completely. Moreover, the effectiveness of UV/Cl on the removal of indigenous bacteria in actual water conditions was also confirmed. In short, the study provides significant theoretical and practical implications for ensuring microbial safety during water treatment and use.

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http://hdl.handle.net/10453/176446