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• W2077860215 endingPage "1932" @default.
• W2077860215 startingPage "1921" @default.
• W2077860215 abstract "Pharmaceuticals and personal care products (PPCPs) are now routinely detected in raw and treated municipal wastewater. Since conventional wastewater treatment processes are not particularly effective for PPCP removal, treated wastewater discharges are the main entry points for PPCPs into the environment, and eventually into our drinking water. This study investigates the use of laccase-catalyzed oxidation for removing low concentrations of PPCPs from municipal wastewater primary effluent. Oxybenzone was selected as a representative PPCP. Like many other PPCPs, it is not recognized directly by the laccase enzyme. Therefore, mediators were used to expand the oxidative range of laccase, and the efficacy of this laccase–mediator system in primary effluent was evaluated. Eight potential mediators were investigated, and 2,2′-Azino-bis(3-ethylbenzthiazoline-6sulphonic acid) diammonium salt (ABTS), a synthetic mediator, and acetosyringone (ACE), a natural mediator, provided the greatest oxybenzone removal efficiencies. An environmentally relevant concentration of oxybenzone (43.8 nM, 10 μg/L) in primary effluent was completely removed (below the detection limit) after two hours of treatment with ABTS, and 95% was removed after two hours of treatment with ACE. Several mediator/oxybenzone molar ratios were investigated at two different initial oxybenzone concentrations. Higher mediator/oxybenzone molar ratios were required at the lower (environmentally relevant) oxybenzone concentration, and ACE required higher molar ratios than ABTS to achieve comparable oxybenzone removal. Oxybenzone oxidation byproducts generated by the laccase–mediator system were characterized and compared to those generated during ozonation. Enzymatic treatment generated byproducts with higher mass to charge (m/z) ratios, likely due to oxidative coupling reactions. The results of this study suggest that, with further development, the laccase–mediator system has the potential to extend the treatment range of laccase to PPCPs not directly recognized by the enzyme, even in a primary effluent matrix." @default.
• W2077860215 created "2016-06-24" @default.
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• W2077860215 date "2011-02-01" @default.
• W2077860215 modified "2023-10-15" @default.
• W2077860215 title "Laccase-catalyzed oxidation of oxybenzone in municipal wastewater primary effluent" @default.
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• W2077860215 doi "https://doi.org/10.1016/j.watres.2010.12.027" @default.
• W2077860215 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21237478" @default.
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