4.7 Article

Pilot-scale assessment of the viability of UVA radiation for H2O2 or S2O82-activation in advanced oxidation processes

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DOI: 10.1016/j.jwpe.2023.104328

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AOPs; Micropollutants; Photolysis; Pilot scale; UVA radiation; Wastewater

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This study compares UVA and UVC radiation for the removal of micropollutants in treated wastewater through the activation of H2O2 or S2O82-. The results indicate that UVC radiation leads to faster degradation rates, and S2O82- is photolyzed faster than H2O2. In treated wastewater, the presence of organic matter inhibits the degradation of estrogen, with stronger inhibitions observed in S2O82- processes.
UVA and UVC radiation were compared for the activation of H2O2 or S2O82- to remove micropollutants remaining in treated wastewater with a view to optimising the cost and/or the efficiency of the commonly studied UVC/ H2O2 process. Experiments were carried out in a dynamic laboratory pilot (20 L). In a simple matrix, UVA radiation were able to produce oxydative radicals from H2O2 or S2O82-, although faster degradation of the estrogens was observed under UVC radiation (up to 55-fold). With both UV radiation, S2O82- was photolyzed faster than H2O2, resulting in faster estrogen degradation (up to 12-fold). Coupling UVA to H2O2 was considered not to be viable because <4 % of the compounds were degraded at 1000 mJ cm-2. In a treated wastewater, estrogen degradations were inhibited due to organic matter and stronger inhibitions were observed with S2O82- processes (up to 80 % inhibition compared to simple matrix). The UVC/S2O82- -process still achieved the fastest degradation rate, but is roughly comparable to the UVC/H2O2-process. Very low degradation rates obtained with UVA/S(2)O(8)(2- )limit the interest in the process. Experiments were also carried out on a mixture of pharmaceuticals leading to similar conclusions.

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