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dc.contributor.authorZheng, Mingen_US
dc.contributor.authorDaniels, Kevin D.en_US
dc.contributor.authorPark, Minkyuen_US
dc.contributor.authorNienhauser, Alec Brockwayen_US
dc.contributor.authorClevenger, Erica C.en_US
dc.contributor.authorLi, Yongmeien_US
dc.contributor.authorSnyder, Shane Allenen_US
dc.identifier.citationZheng, M., Daniels, K. D., Park, M., Nienhauser, A. B., Clevenger, E. C., Li, Y. & Snyder, S. A. (2019). Attenuation of pharmaceutically active compounds in aqueous solution by UV/CaO₂ process : influencing factors, degradation mechanism and pathways. Water Research, 164, 114922-.
dc.description.abstractAs freshwater sources continue to be influenced by wastewater effluents, there is a dire need to develop advanced water treatment processes capable of treating the wastewater-derived contaminants, especially for pharmaceutically active compounds (PhACs). Ultraviolet light (UV) combined with calcium peroxide (CaO2) as an advanced oxidation process (AOP) to attenuate five widespread PhACs (carbamazepine (CBZ), primidone (PMD), phenobarbital (PBB), thiamphenicol (TAP) and florfenicol (FF)) was investigated in this paper. The degradation of these compounds followed pseudo-first-order kinetics (R2 > 0.96). The optimum CaO2 dosage was 0.1 g L-1 and lower initial contaminants concentration was beneficial to their degradation. The UV/CaO2 treatment of test PhACs was attributed to the combination of UV/H2O2 and UV-base-photolysis (UV/Ca(OH)2), and the degradation mechanism was recognized as both UV direct photolysis and indirect photolysis caused by reactive radicals (•OH, triplet states of dissolved organic matter (3DOM*), and 1O2). Furthermore, the tentative transformation pathways of the five PhACs were proposed based on the detected intermediates and the degradation mechanisms. The final products of inorganic carbon and nitrogen indicate UV/CaO2 treatment can significantly mineralize test PhACs. Also, the CaO2 addition significantly reduced the energy consumption of UV irradiation according to electrical energy per order. The effective removal of CBZ and PMD in a secondary wastewater effluent by UV/CaO2 treatment demonstrates the potential use of this AOP technology in advanced treatment of wastewater-derived PhACs.en_US
dc.relation.ispartofWater Researchen_US
dc.rights© 2019 Elsevier Ltd. All rights reserved. This paper was published in Water Research and is made available with permission of Elsevier Ltd..en_US
dc.subjectEngineering::Environmental engineering::Water treatmenten_US
dc.titleAttenuation of pharmaceutically active compounds in aqueous solution by UV/CaO₂ process : influencing factors, degradation mechanism and pathwaysen_US
dc.typeJournal Articleen
dc.contributor.researchNanyang Environment and Water Research Instituteen_US
dc.description.versionAccepted versionen_US
dc.subject.keywordsPharmaceutically Active Compoundsen_US
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