Investigation of clofibric acid removal by UV/persulfate and UV/chlorine processes: Kinetics and formation of disinfection byproducts during subsequent chlor(am)ination

Lu, Xian; Shao, Yawei; Gao, Naiyun; Chen, Juxiang; Deng, Huiping; Chu, Wenhai; An, Na; Peng, Fangyuan

doi:10.1016/j.cej.2017.08.117

Cited by 94 publications

(46 citation statements)

References 42 publications

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“…Figures 9 and 10 display the decomposition of CIP at different HA dosages (0.1 to 10 mg/L) in UV/chlorine and UV/PS, respectively, at initial CIP concentration of 1 μM, oxidant dosage of 1 mM, and pH 0 7.4. The presence of HA inhibited the degradation of the target pollutant in both the UV-based AOPs, consistent with the reports of most studies (Kong et al, 2016;Liu et al, 2016;Lu et al, 2018). The CIP degradation was significantly obstructed with an increasing HA concentration.…”

Section: Research Articlesupporting

confidence: 90%

“…Compared to Cl − , HCO 3 − had a more apparent inhibitory effect on the degradation of CIP as the reaction of HCO 3 − with either HO · or Cl · generates CO 3 · − (Equations () and ()) (Lu et al, ), which had a weaker oxidation capacity with a redox potential of 1.59–1.63V (Bennedsen, Muff, & Søgaard, ). In addition, the reaction solution becomes alkaline upon addition of HCO 3 − , and as explained previously in Section 3.3, an alkaline condition obstructs the degradation of CIP.…”

Section: Resultsmentioning

confidence: 99%

“…HA absorbs UV light at 254 nm and acts as an inner filter with extinction coefficient of 3.15 (L m −1 mg −1 ) (Fang et al, ; Lu et al, ), thereby decreasing the rate at which chlorine photolysis produces HO · and Cl · . In addition, HA could react with HO · and Cl · (Fang et al, ), which reduces the availability of free radicals in the UV/chlorine system that can react with CIP.…”

Section: Resultsmentioning

confidence: 99%

“…The HA‐dependent trend of the UV/PS process may be explained by the phenomenon that HA is a strong absorber of UV light, and hence competes with K 2 S 2 O 8 and CIP for photons (Lu et al, ). This reduces the effective concentration of active radicals in the system.…”

Section: Resultsmentioning

confidence: 99%

“…The electrical energy per order (EE/O) is often used to evaluate the feasibility of AOPs and their prospective practical application (Lu et al, ). In case of CIP removal by UV/chlorine and UV/PS processes, EE/O can be defined as the electrical energy in kilowatt hours (kWh) required to remove the CIP by one order of magnitude in 1 m 3 or 1 L of contaminated water or air (Ammar et al, ; Xu et al, ).…”

Section: Resultsmentioning

confidence: 99%

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Comparison of ciprofloxacin degradation in reclaimed water by UV/chlorine and UV/persulfate advanced oxidation processes

Yang

Chen

et al. 2019

Water Environment Research

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This study analyzed the ciprofloxacin (CIP) degradation in real reclaimed water through UV/chlorine and UV/persulfate (UV/PS) advanced oxidation processes. The influence of oxidant dosage, pH, inorganic anions, and humic acid (HA) on the oxidation capacity and performances of various UV‐based processes was investigated. The results revealed that the CIP degradation rate constants in the UV/chlorine and UV/PS processes were higher than that in UV/H2O2, direct‐UV, NaClO, and K2S2O8 processes. The removal rate peaked at 0.1 mM oxidant dosage for 1 μM CIP, while the rate constant was highest at pH 5 (UV/chlorine) and pH 7 (UV/PS). The presence of Cl−, HCO3−, and HA inhibited CIP removal in both processes. The degradation rate observed in reclaimed water was high, but still lower than that in laboratory water by 9.2 (UV/chlorine) and 9 (UV/PS) times. The UV/chlorine and UV/PS processes were found to be more cost‐effective and hence more feasible in removing refractory compounds in reclaimed water. Practitioner points The addition of oxidant and UV irradiation together had a pronounced promotion in the degradation of CIP. Cl· and SO4·− had potential importance for enhancing CIP degradation in UV/chlorine and UV/PS process, respectively. UV/chlorine and UV/PS processes exhibited effective removal capability to CIP in real reclaimed water.

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Section: Research Articlesupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Comparison of ciprofloxacin degradation in reclaimed water by UV/chlorine and UV/persulfate advanced oxidation processes

Yang

Chen

et al. 2019

Water Environment Research

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Advanced Oxidation Processes for Microconstituents Removal in Aquatic Environments

Chowdhury

Surampalli

Bhunia

2023

Microconstituents in the Environment

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Fate of environmental pollutants

Weerakoon

Lim

et al. 2019

Water Environment Research

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This annual review covers the literature published in 2018 on topics related to the occurrence and fate of environmental pollutants in wastewater. Due to the vast amount of literature published on this topic, we have discussed only a portion of the quality research publications, due to the limitation of space. The abstract search was carried out using Web of Science, and the abstracts were selected based on their relevance. In a few cases, full‐text articles were referred to understand new findings better. This review is divided into the following sections: antibiotic‐resistant bacteria (ARBs) and antibiotic‐resistant genes (ARGs), disinfection by‐products (DBPs), drugs of abuse (DoAs), estrogens, heavy metals, microplastics, per‐ and polyfluoroalkyl compounds (PFAS), pesticides, and pharmaceuticals and personal care products (PPCPs), with the addition of two new classes of pollutants to previous years (DoAs and PFAS).

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Investigation of clofibric acid removal by UV/persulfate and UV/chlorine processes: Kinetics and formation of disinfection byproducts during subsequent chlor(am)ination

Cited by 94 publications

References 42 publications

Comparison of ciprofloxacin degradation in reclaimed water by UV/chlorine and UV/persulfate advanced oxidation processes

Comparison of ciprofloxacin degradation in reclaimed water by UV/chlorine and UV/persulfate advanced oxidation processes

Advanced Oxidation Processes for Microconstituents Removal in Aquatic Environments

Fate of environmental pollutants

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