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Title: Attenuation of pharmaceutically active compounds in aqueous solution by UV/CaO₂ process : influencing factors, degradation mechanism and pathways
Authors: Zheng, Ming
Daniels, Kevin D.
Park, Minkyu
Nienhauser, Alec Brockway
Clevenger, Erica C.
Li, Yongmei
Snyder, Shane Allen
Keywords: Engineering::Environmental engineering::Water treatment
Issue Date: 2019
Source: Zheng, 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-.
Journal: Water Research 
Abstract: As 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.
ISSN: 0043-1354
DOI: 10.1016/j.watres.2019.114922
Rights: © 2019 Elsevier Ltd. All rights reserved. This paper was published in Water Research and is made available with permission of Elsevier Ltd..
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:NEWRI Journal Articles

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