Inactivation and subsequent reactivation of Aspergillus species by the combination of UV and monochloramine: Comparisons with UV/chlorine

Wu, Gehui; Zhao, Hui; Wan, Qiqi; Xu, Xiangqian; Cao, Ruihua; Li, Kai; Wang, Jingyi; Lu, Jinsuo; Wen, Gang

doi:10.1016/j.jes.2022.03.021

Cited by 13 publications

(14 citation statements)

References 70 publications

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“…This process causes irreversible damage that cannot be repaired. 26,34 Similar results have been found in previous studies. 34,35 For example, it has been concluded that UV/NH 2 Cl was more effective than UV alone in reducing the risk of photoreactivation when inactivating Aspergillus spores.…”

Section: Reactivation Of P Aeruginosa In Uv and Uv/nh 2 Br Processessupporting

confidence: 91%

“…The sequence of destruction of P. aeruginosa was UV/NH 2 Br > UV > NH 2 Br, consistent with previous results. 25–27 Moreover, when the initial NH 2 Br concentration in UV/NH 2 Br was 10 mg L −1 and 20 mg L −1 , the log reduction increased significantly to 4.17 and 5.93, respectively. The variance in sterilization efficacy could be attributed to the divergent mechanisms inherent in each of the three approaches.…”

Section: Resultsmentioning

confidence: 94%

“…The variance in sterilization efficacy could be attributed to the divergent mechanisms inherent in each of the three approaches. 26 The rationale behind the marginal log reduction achieved by NH 2 Br alone can be attributed to both the inherent low reactivity of NH 2 Br and the observed bromine tolerance exhibited by P. aeruginosa. 19,28 By inducing damage to nucleic acids, UV irradiation disrupts DNA replication, ultimately resulting in the demise of P. aeruginosa.…”

Section: Resultsmentioning

confidence: 99%

“…34,35 For example, it has been concluded that UV/NH 2 Cl was more effective than UV alone in reducing the risk of photoreactivation when inactivating Aspergillus spores. 26 The mild reactivation under UV/NH 2 Br may be because a few cells in the VBNC state regained their cultivability in a eutrophic environment. 15,36 In conclusion, this phenomenon substantiates that UV/NH 2 Br treatment effectively suppressed the dark repair mechanism of P. aeruginosa, primarily attributable to the destructive impact of reactive species on cellular structures.…”

Section: Reactivation Of P Aeruginosa In Uv and Uv/nh 2 Br Processesmentioning

confidence: 99%

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Unveiling a potential disinfection process in ultraviolet treatment of bromine-containing water: inactivation of P. aeruginosa in a UV/NH₂Br system

Zhu,

Yang,

et al. 2023

Environ. Sci.: Water Res. Technol.

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Section: Reactivation Of P Aeruginosa In Uv and Uv/nh 2 Br Processessupporting

confidence: 91%

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Reactivation Of P Aeruginosa In Uv and Uv/nh 2 Br Processesmentioning

confidence: 99%

See 2 more Smart Citations

Unveiling a potential disinfection process in ultraviolet treatment of bromine-containing water: inactivation of P. aeruginosa in a UV/NH₂Br system

Zhu,

Yang,

et al. 2023

Environ. Sci.: Water Res. Technol.

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“…To investigate whether the spores can be photoreactivated after treatment by different processes, experiments were conducted following the method described in previous literature, and the details are shown in Text S5. [26][27][28]41 2.2.5. DBP Formation and DBP-Associated Toxicity.…”

Section: Methodsmentioning

confidence: 99%

Rapid Inactivation of Fungal Spores in Drinking Water by Far-UVC Photolysis of Free Chlorine

Wang,

Ma,

Zhao

et al. 2023

Environ. Sci. Technol.

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Effective and affordable disinfection technology is one key to achieving Sustainable Development Goal 6. In this work, we develop a process by integrating Far-UVC irradiation at 222 nm with free chlorine (UV 222 /chlorine) for rapid inactivation of the chlorine-resistant and opportunistic Aspergillus niger spores in drinking water. The UV 222 /chlorine process achieves a 5.0-log inactivation of the A. niger spores at a chlorine dosage of 3.0 mg L −1 and a UV fluence of 30 mJ cm −2 in deionized water, tap water, and surface water. The inactivation rate constant of the spores by the UV 222 /chlorine process is 0.55 min −1 , which is 4.6-fold, 5.5fold, and 1.8-fold, respectively, higher than those of the UV 222 alone, chlorination alone, and the conventional UV 254 /chlorine process under comparable conditions. The more efficient inactivation by the UV 222 /chlorine process is mainly attributed to the enhanced generation of reactive chlorine species (e.g., 6.7 × 10 −15 M of Cl • ) instead of hydroxyl radicals from UV 222 photolysis of chlorine, which is verified through both experiments and a kinetic model. We further demonstrate that UV 222 photolysis damages the membrane integrity and benefits the penetration of chlorine and radicals into cells for inactivation. The merits of the UV 222 /chlorine process over the UV 254 /chlorine process also include the more effective inhibition of the photoreactivation of the spores after disinfection and the lower formation of chlorinated disinfection byproducts and toxicity.

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The improved resistance of germinated spores to ultraviolet irradiation: Comparison with chlorine

Cao,

Tan,

Wan

et al. 2024

Chemosphere

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Inactivation and subsequent reactivation of Aspergillus species by the combination of UV and monochloramine: Comparisons with UV/chlorine

Cited by 13 publications

References 70 publications

Unveiling a potential disinfection process in ultraviolet treatment of bromine-containing water: inactivation of P. aeruginosa in a UV/NH₂Br system

Unveiling a potential disinfection process in ultraviolet treatment of bromine-containing water: inactivation of P. aeruginosa in a UV/NH₂Br system

Rapid Inactivation of Fungal Spores in Drinking Water by Far-UVC Photolysis of Free Chlorine

The improved resistance of germinated spores to ultraviolet irradiation: Comparison with chlorine

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Inactivation and subsequent reactivation of Aspergillus species by the combination of UV and monochloramine: Comparisons with UV/chlorine

Cited by 13 publications

References 70 publications

Unveiling a potential disinfection process in ultraviolet treatment of bromine-containing water: inactivation of P. aeruginosa in a UV/NH2Br system

Unveiling a potential disinfection process in ultraviolet treatment of bromine-containing water: inactivation of P. aeruginosa in a UV/NH2Br system

Rapid Inactivation of Fungal Spores in Drinking Water by Far-UVC Photolysis of Free Chlorine

The improved resistance of germinated spores to ultraviolet irradiation: Comparison with chlorine

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Product

Resources

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Unveiling a potential disinfection process in ultraviolet treatment of bromine-containing water: inactivation of P. aeruginosa in a UV/NH₂Br system

Unveiling a potential disinfection process in ultraviolet treatment of bromine-containing water: inactivation of P. aeruginosa in a UV/NH₂Br system