Abstract
The electro-peroxone (E-peroxone) process is an emerging electrocatalytic ozonation process that is enabled by in situ producing hydrogen peroxide (H2O2) from cathodic oxygen reduction during ozonation. The in situ-generated H2O2 can then promote ozone (O3) transformation to hydroxyl radicals (•OH), and thus enhance the abatement of ozone-refractory pollutants compared to conventional ozonation. In this study, a chemical kinetic model was employed to simulate micropollutant abatement during the E-peroxone treatment of various water matrices (surface water, secondary wastewater effluent, and groundwater). Results show that by following the O3 and •OH exposures during the E-peroxone process, the abatement kinetics of a variety of model micropollutants could be well predicted using the model. In addition, the effect of specific ozone doses on micropollutant abatement efficiencies could be quantitatively evaluated using the model. Therefore, the chemical kinetic model can be used to reveal important information for the design and optimization of the treatment time and ozone doses of the E-peroxone process for cost-effective micropollutant abatement in water and wastewater treatment.
Highlights
The electro-peroxone (E-peroxone) process is an emerging electrocatalytic ozonation process that has shown great potential for micropollutant abatement in water and wastewater treatment [1,2,3,4]
By using O2 that is always present in excess in ozone-based processes to produce H2 O2, the E-peroxone process can significantly improve the performance of water and wastewater treatment in many aspects [23,24]
In a previous study [32], we have found that the final abatement efficiency of various micropollutants at the end of the E-peroxone process can be reasonably predicted using a simple chemical kinetic model (Equation (3)): C
Summary
The electro-peroxone (E-peroxone) process is an emerging electrocatalytic ozonation process that has shown great potential for micropollutant abatement in water and wastewater treatment [1,2,3,4]. Molecules 2019, 24, 2638 formation in ozone-based processes) back to bromide [16,17,18]. The E-peroxone process can effectively inhibit bromate formation during the treatment of bromide-containing water, which has been a major concern associated with conventional ozonation [19,20,21,22]. By using O2 that is always present in excess in ozone-based processes to produce H2 O2 , the E-peroxone process can significantly improve the performance of water and wastewater treatment in many aspects [23,24]
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