摘要
This research evaluated integrating ultraviolet (UV) irradiation with electrochemical chlorine (Cl 2 ) and/or hydrogen peroxide (H 2 O 2 ) production for micropollutant abatement in water treatment. Combining UV with anodic Cl 2 production (E-UV/Cl 2 ) effectively abated gemfibrozil and naproxen, but ineffectively abated ibuprofen due to its low reactivity with chlorine radicals (e.g., ClO• and Cl 2 - •). In comparison, combining UV with cathodic H 2 O 2 production (E-UV/H 2 O 2 ) more effectively abated ibuprofen, but less efficiently abated gemfibrozil and naproxen due to the significant scavenging of •OH by the water matrix. Moreover, simultaneously producing Cl 2 and H 2 O 2 during UV irradiation (E-UV/Cl 2 /H 2 O 2 ) in an undivided reactor did not further enhance micropollutant abatement compared to the E-UV/H 2 O 2 process because of the mutual consumption of anodically generated Cl 2 and cathodic generated H 2 O 2 . In contrast, by separating the anodic and cathodic compartments with an anion exchange membrane and operating the E-UV/Cl 2 /H 2 O 2 process in an anode-to-cathode configuration, all test micropollutants could be adequately abated through the sequential oxidation with the selective chlorine radicals and non-selective •OH in the anodic and cathodic compartments. In general, the concentrations of micropollutants could be abated by 84–100% with a short hydraulic residence time (HRT) of 9.4 min and feasible energy demand (E EO ≤ 3.15 kWh/m 3 -log) in the selected groundwater and secondary wastewater during the E-UV/Cl 2 /H 2 O 2 process in the divided reactor. The results indicate that different synergistic effects can be obtained for micropollutant abatement by combining UV and electrochemical processes in varying configurations, and the divided E-UV/Cl 2 /H 2 O 2 process is a more robust and energy-efficient method for micropollutant abatement during decentralized water treatment.
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