A review of the recent advances on the treatment of industrial wastewaters by Sulfate Radical-based Advanced Oxidation Processes (SR-AOPs)

Giannakis, Stefanos; Lin, Kun‐Yi Andrew; Ghanbari, Farshid

doi:10.1016/j.cej.2020.127083

Cited by 952 publications

(225 citation statements)

References 229 publications

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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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“…[22][23][24] Thus, sulfate radical-based AOPs (SR-AOPs) have a good application prospect in removing organic pollution. 25 Currently, peroxymonosulfate (PMS) and peroxydisulfate (PDS) are the common oxidants utilized to generate SO 4 c À . 26 Their redox potentials are 1.82 V 27 and 2.01 V, 28 respectively.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and reaction mechanism of photochemical degradation of diclofenac by UV-activated peroxymonosulfate

et al. 2021

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“…Other constituents of the real-wastewater which are necessary to evaluate in photo-assisted EAOPs are the dissolved organic matter (DOM), the NOM and NO 3 − . The DOM is usually ignored in lab-scale experiments resulting in high efficacies due to the lack of the scavenger-effect of the DOM ( Giannakis et al., 2021 ). The NOM consist of humic substances such as humic acid and fulvic acid, and they can have both inhibitory and synergistic effects on the performance of AOPs.…”

Section: Future Trends and Perspectivesmentioning

confidence: 99%

Photo-assisted electrochemical advanced oxidation processes for the disinfection of aqueous solutions: A review

et al. 2021

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Disinfection is usually the final step in water treatment and its effectiveness is of paramount importance in ensuring public health. Chlorination, ultraviolet (UV) irradiation and ozone (O 3 ) are currently the most common methods for water disinfection; however, the generation of toxic by-products and the non-remnant effect of UV and O 3 still constitute major drawbacks. Photo-assisted electrochemical advanced oxidation processes (EAOPs) on the other hand, appear as a potentially effective option for water disinfection. In these processes, the synergism between electrochemically produced active species and photo-generated radicals, improve their performance when compared with the corresponding separate processes and with other physical or chemical approaches. In photo-assisted EAOPs the inactivation of pathogens takes place by means of mechanisms that occur at different distances from the anode, that is: (i) directly at the electrode’s surface (direct oxidation), (ii) at the anode’s vicinity by means of electrochemically generated hydroxyl radical species (quasi-direct), (iii) or at the bulk solution (away from the electrode surface) by photo-electrogenerated active species (indirect oxidation). This review addresses state of the art reports concerning the inactivation of pathogens in water by means of photo-assisted EAOPs such as photo-electrocatalytic process, photo-assisted electrochemical oxidation, photo-electrocoagulation and cathodic processes. By focusing on the oxidation mechanism, it was found that while quasi-direct oxidation is the preponderant inactivation mechanism, the photo-electrocatalytic process using semiconductor materials is the most studied method as revealed by numerous reports in the literature. Advantages, disadvantages, trends and perspectives for water disinfection in photo-assisted EAOPs are also analyzed in this work.

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A review of the recent advances on the treatment of industrial wastewaters by Sulfate Radical-based Advanced Oxidation Processes (SR-AOPs)

Cited by 952 publications

References 229 publications

PFAS Degradation in Ultrapure and Groundwater Using Non-Thermal Plasma

PFAS Degradation in Ultrapure and Groundwater Using Non-Thermal Plasma

Kinetics and reaction mechanism of photochemical degradation of diclofenac by UV-activated peroxymonosulfate

Photo-assisted electrochemical advanced oxidation processes for the disinfection of aqueous solutions: A review

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