Comparison of UV-induced AOPs (UV/Cl, UV/NHCl, UV/ClO and UV/HO) in the degradation of iopamidol: Kinetics, energy requirements and DBPs-related toxicity in sequential disinfection processes

Tian, Fuyang; Ye, Wen-Kai; Xu, Bin; Hu, Xiaojun; Ma, Shi-Xu; Lai, Fan; Gao, Yu-qiong; Xing, Haibo; Xia, Wei; Wang, Bo

doi:10.1016/j.cej.2020.125570

Cited by 111 publications

(31 citation statements)

References 89 publications

(208 reference statements)

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“…Advanced Oxidation Processes (AOPs) have been proposed to be implemented together with the conventional biological treatments to efficiently address the removal of CECs from wastewater [ 12 , 13 , 14 , 15 ]. These processes rely on chemical and/or physical processes generating highly reactive radical species (such as HO ● and SO 4 ●− ) able to react non selectively with the most organic compounds in solution, including, bio-recalcitrant compounds [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

PFAS Degradation in Ultrapure and Groundwater Using Non-Thermal Plasma

Palma

Papagiannaki²,

Lai³

et al. 2021

Molecules

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Perfluoroalkyl substances (PFAS) represent one of the most recalcitrant class of compounds of emerging concern and their removal from water is a challenging goal. In this study, we investigated the removal efficiency of three selected PFAS from water, namely, perfluorooctanoic acid (PFOA), perfluorohexanoic acid (PFHxA) and pefluorooctanesulfonic acid (PFOS) using a custom-built non-thermal plasma generator. A modified full factorial design (with 2 levels, 3 variables and the central point in which both quadratic terms and interactions between couple of variables were considered) was used to investigate the effect of plasma discharge frequency, distance between the electrodes and water conductivity on treatment efficiency. Then, the plasma treatment running on optimized conditions was used to degrade PFAS at ppb level both individually and in mixture, in ultrapure and groundwater matrices. PFOS 1 ppb exhibited the best degradation reaching complete removal after 30 min of treatment in both water matrices (first order rate constant 0.107 min−1 in ultrapure water and 0.0633 min−1 in groundwater), while the degradation rate of PFOA and PFHxA was slower of around 65% and 83%, respectively. During plasma treatment, the production of reactive species in the liquid phase (hydroxyl radical, hydrogen peroxide) and in the gas phase (ozone, NOx) was investigated. Particular attention was dedicated to the nitrogen balance in solution where, following to NOx hydrolysis, total nitrogen (TN) was accumulated at the rate of up to 40 mgN L−1 h−1.

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Section: Introductionmentioning

confidence: 99%

PFAS Degradation in Ultrapure and Groundwater Using Non-Thermal Plasma

Palma

Papagiannaki²,

Lai³

et al. 2021

Molecules

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“…EE/O total includes the components of direct electrical energy (EE/O electricity ) and equivalent electrical energy of the oxidants (EE/O oxidant ). Text S4 provides information on the calculation formulas of EE/O total , EE/O electricity , and EE/O oxidant , while details of the calculations are provided in Table S4. , As presented in Figure c, the EE/O total of the E-PM-PDS process was 1.007 kWh m –3 , which was much lower than that of other processes (5.200–75.701 kWh m –3 ) investigated in this study. The results demonstrated that the E-PM-PDS process improved the oxidation efficiency of target organic pollutants and was also advantageous in terms of energy consumption.…”

Section: Resultsmentioning

confidence: 81%

Nonradical Activation of Peroxydisulfate with In Situ Generated Amorphous MnO₂ in an Electro-Permanganate Process: Involvement of Singlet Oxygen, Electron Transfer, and Mn(III)_aq

et al. 2022

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A novel water treatment process based on a combination of electrolysis (E) with permanganate (PM) and peroxydisulfate (PDS) was systematically investigated. The combination exhibited significant synergy in degrading refractory organics such as diclofenac (DCF), carbamazepine, and nitrobenzene. In comparison to E-PDS (20.45%, 12.448 kWh m–3) and E-PM (36.36%, 5.200 kWh m–3) processes, the E-PM-PDS process could mineralize 70.45% DCF within 180 min with the lowest specific energy consumption (1.007 kWh m–3). The mechanism study revealed that electricity could significantly promote the activation of PDS with the in situ generated amorphous MnO2 via nonradical pathways (1O2 oxidation and electron transfer), and the activated PDS, in turn, facilitated Mn(II)aq to generate reactive Mn(III)aq. In the E-PM-PDS process, DCF degradation was enhanced upon increasing PM dosage, PDS dosage, and current density, and also by decreasing the pH. Cations facilitated the DCF degradation with the order of positive effects as Fe3+ > Zn2+ > Ca2+ > Mg2+. The presence of humic acid (HA) significantly enhanced the DCF degradation, while the addition of HCO3 – or HPO4 2– caused adverse effects. This work may provide a high-efficiency and low-cost technology for water treatment.

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“…Though the combination of UVC and ClO 2 enhanced the micropollutant abatement via generating more reactive species (e.g., • OH and chlorine radical (Cl • )), they are less effective than the well-documented UVC/H 2 O 2 , UVC/Cl 2 , and UVC/NH 2 Cl AOPs under the same initial oxidant dosages. For example, Tian et al [57] compared the combination of UVC with different oxidants (i.e., Cl 2 , NH 2 Cl, ClO 2 , and H 2 O 2 ) in the degradation of iopamidol and reported the k obs following the order of UVC/Cl 2 (1.9 × 10 −2 s −1 ) > UVC/H 2 O 2 (1.3 × 10 −2 s −1 ) > UVC/NH 2 Cl (1.0 × 10 −2 s −1 ) > UVC/ClO 2 (4.4 × 10 −3 s −1 ) under the same conditions. 22)), which subsequently is activated by UV radiation to produce RCS (i.e., Cl • and chlorine oxide radicals (ClO • )).…”

Section: Reaction Kineticsmentioning

confidence: 99%

Direct and Activated Chlorine Dioxide Oxidation for Micropollutant Abatement: A Review on Kinetics, Reactive Sites, and Degradation Pathway

Chen

et al. 2022

Water

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Recently, ClO2-based oxidation has attracted increasing attention to micropollutant abatement, due to high oxidation potential, low disinfection byproduct (DBPs) formation, and easy technical implementation. However, the kinetics, reactive sites, activation methods, and degradation pathways involved are not fully understood. Therefore, we reviewed current literature on ClO2-based oxidation in micropollutant abatement. In direct ClO2 oxidation, the reactions of micropollutants with ClO2 followed second-order reaction kinetics (kapp = 10−3–106 M−1 s−1 at neutral pH). The kapp depends significantly on the molecular structures of the micropollutant and solution pH. The reactive sites of micropollutants start with certain functional groups with the highest electron densities including piperazine, sulfonyl amido, amino, aniline, pyrazolone, phenol groups, urea group, etc. The one-electron transfer was the dominant micropollutant degradation pathway, followed by indirect oxidation by superoxide anion radical (O2•−) or hydroxyl radical (•OH). In UV-activated ClO2 oxidation, the reactions of micropollutants followed the pseudo-first-order reaction kinetics with the rates of 1.3 × 10−4–12.9 s−1 at pH 7.0. Their degradation pathways include direct ClO2 oxidation, direct UV photolysis, ozonation, •OH-involved reaction, and reactive chlorine species (RCS)-involved reaction. Finally, we identified the research gaps and provided recommendations for further research. Therefore, this review gives a critical evaluation of ClO2-based oxidation in micropollutant abatement, and provides recommendations for further research.

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Comparison of UV-induced AOPs (UV/Cl, UV/NHCl, UV/ClO and UV/HO) in the degradation of iopamidol: Kinetics, energy requirements and DBPs-related toxicity in sequential disinfection processes

Cited by 111 publications

References 89 publications

PFAS Degradation in Ultrapure and Groundwater Using Non-Thermal Plasma

PFAS Degradation in Ultrapure and Groundwater Using Non-Thermal Plasma

Nonradical Activation of Peroxydisulfate with In Situ Generated Amorphous MnO₂ in an Electro-Permanganate Process: Involvement of Singlet Oxygen, Electron Transfer, and Mn(III)_aq

Direct and Activated Chlorine Dioxide Oxidation for Micropollutant Abatement: A Review on Kinetics, Reactive Sites, and Degradation Pathway

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Comparison of UV-induced AOPs (UV/Cl, UV/NHCl, UV/ClO and UV/HO) in the degradation of iopamidol: Kinetics, energy requirements and DBPs-related toxicity in sequential disinfection processes

Cited by 111 publications

References 89 publications

PFAS Degradation in Ultrapure and Groundwater Using Non-Thermal Plasma

PFAS Degradation in Ultrapure and Groundwater Using Non-Thermal Plasma

Nonradical Activation of Peroxydisulfate with In Situ Generated Amorphous MnO2 in an Electro-Permanganate Process: Involvement of Singlet Oxygen, Electron Transfer, and Mn(III)aq

Direct and Activated Chlorine Dioxide Oxidation for Micropollutant Abatement: A Review on Kinetics, Reactive Sites, and Degradation Pathway

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Nonradical Activation of Peroxydisulfate with In Situ Generated Amorphous MnO₂ in an Electro-Permanganate Process: Involvement of Singlet Oxygen, Electron Transfer, and Mn(III)_aq