PPCP degradation by UV/chlorine treatment and its impact on DBP formation potential in real waters

Yang, Xin; Sun, Jiasen; Fu, Wenjie; Shang, Chii; Li, Yin; Chen, Yiwei; Gan, Wenhui; Fang, Jingyun

doi:10.1016/j.watres.2016.04.011

Cited by 191 publications

(80 citation statements)

References 44 publications

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“…Chlorine is highly selective, and its reactivity was proven to be related to the chemical structure (functional group and dissociation) of organic materials [30]. Only 2.2% CBZ was degraded by chlorination under 10 mg/L chlorine after 5 min in the present work, and the negligible chlorination efficiency of CBZ is in accordance with the results reported in different water matrices [31][32][33]. The other target MPs exhibited specific degradation efficiency values ranging from 28.2% to 77.4%, and E3 was most sensitive to chlorine.…”

Section: Occurrence Of Micropollutants In Reclaimed Watersupporting

confidence: 91%

“…The pH had a negligible influence on the degradation of NAP. Previous studies demonstrated that lower concentrations of OH· and Cl· but a higher concentration of ClO· formed at higher pH levels [21,31,33]. With increasing pH, the decreasing concentrations of OH· and Cl· could be responsible for the decreased removal efficiencies of the 7 MPs, while the enhancement of ClO· could contribute to the accelerated degradation of MPs, such as CLA, DCF, IBP, and Indo.…”

Section: Effect Of Phmentioning

confidence: 97%

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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

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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.

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Section: Occurrence Of Micropollutants In Reclaimed Watersupporting

confidence: 91%

Section: Effect Of Phmentioning

confidence: 97%

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

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“…In drinking water related applications the removal of PPCPs and odor compounds of geosmin and 2-methylisoborneol (2-MIB) is discussed by many researchers [20,65,75,[129][130][131]. However, DBPs formation has been also mentioned in the most of researches, because safety is critically important for drinking water.…”

Section: Applicationsmentioning

confidence: 99%

“…However, DBPs formation has been also mentioned in the most of researches, because safety is critically important for drinking water. It was reported that DBPs such as THMs, HAAs, HANs, ClO 3 − , and BrO 3 − are produced by UV/ chlorine treatment and/or post-chlorination in drinking or surface water [47,56,65,130,131]. However, Sichel et al…”

Section: Applicationsmentioning

confidence: 99%

“…Watts et al concluded that THMs and HAAs formation is not a problem in an UV/chlorine process at a chlorine dose <10 mg/L and a contact time <1 min [130]. Yang et al investigated the formation potential of THMs, HANs, CH, HKs, and TCNM by post-chlorination after UV/chlorine treatment [131]. As a result, these DBPs formation potential by UV/ chlorine treatment was similar to that by UV/H 2 O 2 and the control.…”

Section: Applicationsmentioning

confidence: 99%

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State of the Art of UV/Chlorine Advanced Oxidation Processes: Their Mechanism, Byproducts Formation, Process Variation, and Applications

Kishimoto

2019

J. of Wat. & Envir. Tech.

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The photolysis of chlorine by ultraviolet radiation (UV/chlorine) produces HO˙ and Cl˙, part of which further transforms into reactive chlorine species (RCS) like Cl 2˙− and ClO˙. These radicals are responsible for the advanced oxidation effect of UV/chlorine processes. Recently, UV/chlorine processes gather much attention from researchers and practitioners and published papers on UV/chlorine processes have drastically increased, which were thoroughly reviewed in this paper for understanding the state of the art of these technologies. Fundamental studies elucidate that acidic conditions are favorable to UV/chlorine processes through a change in quantum yield of chlorine photolysis, equilibrium shifts of radical species, and a change in radical scavenger effect of free chlorine. Comparative studies reveal that UV/chlorine processes are usually more energy-efficient than UV/hydrogen peroxide and UV/ persulfate processes. Although unfavorable byproducts formation by RCS reactions is apprehended, application researches in real waters show that UV/chlorine processes do not enhance disinfection byproducts formation very much. Since UV irradiation and chlorination are widely used unit operations, a barrier to install an UV/chlorine process into a conventional process is not high. It is desired to develop and optimize a whole process combined with other unit processes for maximizing benefits in water treatment in the future. CONTENTS INFLUENTIAL FACTORSEffect of pH Effect of chlorine dose Effect of halide ion Effect of alkalinity Effect of natural organic matter (NOM) Effect of UV light source LP-UV/chlorine process MP-UV/chlorine process Excimer-UV/chlorine process UV-LED/chlorine process Solar/chlorine process Comparison with other UV-based AOPs PROCESS VARIATIONS

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Destruction of Pharmaceuticals

2023

Destruction of Hazardous Chemicals in the Laboratory

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PPCP degradation by UV/chlorine treatment and its impact on DBP formation potential in real waters

Cited by 191 publications

References 44 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

State of the Art of UV/Chlorine Advanced Oxidation Processes: Their Mechanism, Byproducts Formation, Process Variation, and Applications

Destruction of Pharmaceuticals

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