Iohexol degradation in wastewater and urine by UV-based Advanced Oxidation Processes (AOPs): Process modeling and by-products identification

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:195

Article

Giannakis, Stefanos¹  Jovic, Milica²  Gasilova, Natalia²  Gelabert, Miguel Pastor³  Schindelholz, Simon¹  Furbringer, Jean-Marie⁴  Girault, Hubert²  Pulgarin, Cesar¹ 

[1] Ecole Polytech Fed Lausanne, SB, ISIC, Grp Adv Oxidat Proc, Stn 6, CH-1015 Lausanne, Switzerland

[2] Ecole Polytech Fed Lausanne, Lab Electrochim Phys & Analyt, CH-1951 Sion, Switzerland

[3] Univ Rovira & Virgili, ETSEQ, E-43007 Tarragona, Spain

[4] Ecole Polytech Fed Lausanne, SB, Phys Sect Management, Stn 3, CH-1015 Lausanne, Switzerland

关键词: Iodinated Contrast Media;    Wastewater treatment;    Urine purification;    Modeling and optimization;    Degradation pathway;    Advanced Oxidation Process;   

DOI  :  10.1016/j.jenvman.2016.07.004

来源: Elsevier

【 摘 要 】

In this work, an Iodinated Contrast Medium (ICM), lohexol, was subjected to treatment by 3 Advanced Oxidation Processes (AOPs) (UV, UV/H2O2, UV/H2O2/Fe2+). Water, wastewater and urine were spiked with lohexol, in order to investigate the treatment efficiency of AOPs. A tri-level approach has been deployed to assess the UV-based AOPs efficacy. The treatment was heavily influenced by the UV transmittance and the organics content of the matrix, as dilution and acidification improved the degradation but iron/H2O2 increase only moderately. Furthermore, optimization of the treatment conditions, as well as modeling of the degradation was performed, by step-wise constructed quadratic or product models, and determination of the optimal operational regions was achieved through desirability functions. Finally, global chemical parameters (COD, TOC and UV-Vis absorbance) were followed in parallel with specific analyses to elucidate the degradation process of lohexol by UV-based AOPs. Through HPLC/MS analysis the degradation pathway and the effects the operational parameters were monitored, thus attributing the pathways the respective modifications. The addition of iron in the UV/H2O2 process inflicted additional pathways beneficial for both lohexol and organics removal from the matrix. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

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