Degradation of natural organic matter by UV/chlorine oxidation: Molecular decomposition, formation of oxidation byproducts and cytotoxicity

Wang, Wenlong; Zhang, Xue; Wu, Qian-Yuan; Du, Ye; Hu, Hong-Ying

doi:10.1016/j.watres.2017.07.029

Cited by 149 publications

(43 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous works reported that the UV-chlorine process could significantly increase the formation of DBPs, including THMs and HAAs, not only in commercial organic matter samples [36] but also in river water samples [37]. Different results were found in our work.…”

Section: Dbp Formationcontrasting

confidence: 91%

Degradation of Micropollutants by UV–Chlorine Treatment in Reclaimed Water: pH Effects, Formation of Disinfectant Byproducts, and Toxicity Assay

Wang

Ying

Минг

et al. 2019

Water

View full text Add to dashboard Cite

The utilization of reclaimed water is a reliable and sustainable approach to enhance water supply in water-deficient cities. However, the presence of micro-organic pollutants (MPs) in reclaimed water has potential adverse effects on aquatic ecosystems and human health. In this study, we investigated the occurrence of 12 target MPs in the influent and reclaimed water collected from a local wastewater treatment plant, and the ultraviolet (UV)-chlorine process was applied to analyze its ability to remove MPs. The results showed that all 12 MPs were detected in both the influent and the reclaimed water, with the concentrations ranging from 25.5 to 238 ng/L and 8.6 to 42.5 ng/L, respectively. Over 52% of all the target MPs were readily degraded by the UV-chlorine process, and the removal efficiency was 7.7% to 64.2% higher than the corresponding removal efficiency by chlorination or UV irradiation only. The degradation efficiency increased with the increasing initial chlorine concentration. The pH value had a slight influence on the MP degradation and exhibited different trends for different MPs. The formation of known disinfectant byproducts (DBPs) during the UV-chlorine process was 33.8% to 68.4% of that in the chlorination process, but the DBPs' formation potentials were 1.3 to 2.2 times higher. The toxicity assay indicated that UV-chlorine can effectively reduce the toxicity of reclaimed water.

show abstract

Section: Dbp Formationcontrasting

confidence: 91%

Degradation of Micropollutants by UV–Chlorine Treatment in Reclaimed Water: pH Effects, Formation of Disinfectant Byproducts, and Toxicity Assay

Wang

Ying

Минг

et al. 2019

Water

View full text Add to dashboard Cite

show abstract

“…In contrast to control, the concentration of COD in NaClO pretreated wastewater was higher but did not present significant (P > 0.05) difference. A similar phenomenon was also noticed by Plummer and Edzwald (2002) and it is attributed to the strong oxidation capability of chlorine which oxidizes part of large-non-soluble organic molecules such as fat into soluble ones (e.g., fatty acid) (Wang et al, 2017). The effect of NaClO pretreatment on total PO 4 3− concentration was insignificant (P > 0.05).…”

Section: Impact Of Naclo Pretreatment On Wastewater Qualitysupporting

confidence: 72%

Integration of sodium hypochlorite pretreatment with co-immobilized microalgae/bacteria treatment of meat processing wastewater

Meneses

Hassan

2020

Bioresource Technology

View full text Add to dashboard Cite

Wastewater with 0.2, 0.4, 0.8, 1.0 mg/L free chlorine was biologically treated using co-immobilized microalgae/ bacteria. In contrast, non-pretreated wastewater was treated with beads (control) and blank beads (blank) under the same operating condition. Results showed that NaClO pretreatment removed 8-33% total nitrogen (TN), 31-45% true color and 0.7-2.5 log CFU/mL aerobic-bacteria. At the end of treatment, maximum algal biomass (2,027 dry weight mg/L) was achieved with 0.2 mg/L free chlorine. Bacterial growth in wastewater was decreased by NaClO pretreatment before reaching 7.2-7.7 log CFU/mL on the fifth day. Beads with microor-1 digitalcommons.unl.edu

show abstract

“…65 However, previous studies reported that the effect of HO • on intracellular genes is negligible due to the rapid consumption. 67,68 In contrast, RCS, as selective radicals, show high reactivity toward compounds containing electrondonating groups such as alkyl/alkoxy aromatics and olefins, 69,70 which may contribute to target genes more highly than HO • . 24,71 To further affirm that UV/chlorine treatment is effective in DNA removal, the elimination of pure plasmids containing the opr gene was investigated (Figure S9).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Assessment of the UV/Chlorine Process in the Disinfection of Pseudomonas aeruginosa: Efficiency and Mechanism

Wang

Guo

et al. 2021

Environ. Sci. Technol.

144

View full text Add to dashboard Cite

UV irradiation and chlorination have been widely used for water disinfection. However, there are some limitations, such as the risk of generating viable but nonculturable bacteria and bacteria reactivation when using UV irradiation or chlorination alone. This study comprehensively evaluated the feasibility of the UV/chlorine process in drinking water disinfection, and Pseudomonas aeruginosa was selected as the target microorganism. The number of culturable cells was effectively reduced by more than 5 orders of magnitude (5-log 10 ) after UV, chlorine, and UV/chlorine treatments. However, intact and VBNC cells were detected at 10 3 to 10 4 cells/mL after UV and chlorine treatments, whereas they were undetectable after UV/chlorine treatment due to the primary contribution of reactive chlorine species (Cl • , Cl 2•− , and ClO • ). After UV/chlorine treatment, the metabolic activity determined using single cell Raman spectroscopy was much lower than that after UV. The level of toxic opr gene in P. aeruginosa decreased by more than 99% after UV/chlorine treatment. Importantly, bacterial dark reactivation was completely suppressed by UV/chlorine treatment but not UV or chlorination. This study suggests that the UV/chlorine treatment can completely damage bacteria and is promising for pathogen inactivation to overcome the limitations of UV and chlorine treatments alone.

show abstract

Degradation of natural organic matter by UV/chlorine oxidation: Molecular decomposition, formation of oxidation byproducts and cytotoxicity

Cited by 149 publications

References 43 publications

Degradation of Micropollutants by UV–Chlorine Treatment in Reclaimed Water: pH Effects, Formation of Disinfectant Byproducts, and Toxicity Assay

Degradation of Micropollutants by UV–Chlorine Treatment in Reclaimed Water: pH Effects, Formation of Disinfectant Byproducts, and Toxicity Assay

Integration of sodium hypochlorite pretreatment with co-immobilized microalgae/bacteria treatment of meat processing wastewater

Assessment of the UV/Chlorine Process in the Disinfection of Pseudomonas aeruginosa: Efficiency and Mechanism

Contact Info

Product

Resources

About