Attenuation of pharmaceutically active compounds in aqueous solution by UV/CaO2 process: Influencing factors, degradation mechanism and pathways

WATER RESEARCH

卷:164

Article

Zheng, Ming¹  Daniels, Kevin D.^2,5  Park, Minkyu²  Nienhauser, Alec Brockway²  Clevenger, Erica C.²  Li, Yongmei^1,3  Snyder, Shane A.^2,4 

[1] Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Shanghai 200092, Peoples R China

[2] Univ Arizona, Dept Chem & Environm Engn, 1133 E James E Rogers Way,Harshbarger 108, Tucson, AZ 85721 USA

[3] Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

[4] Nanyang Technol Univ, Nanyang Environm & Water Res Inst, Singapore, Singapore

[5] Hazen & Sawyer, 1400 E Southern Ave, Tempe, AZ 85282 USA

关键词: UV/CaO2;    Pharmaceutically active compounds (PhACs);    Reactive radicals;    Degradation mechanism;    Wastewater effluent;   

DOI  :  10.1016/j.watres.2019.114922

来源: Elsevier

【 摘 要 】

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 (R-2>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 (center dot OH, triplet states of dissolved organic matter ((DOM)-D-3*), and O-1(2)). 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. (C) 2019 Elsevier Ltd. All rights reserved.

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