Abstract
This study compared the behaviors of two classic advanced oxidation processes (AOPs), hydroxyl radical-based AOPs (•OH-based AOPs) and sulfate radical-based AOPs (SO4 •−-based AOPs), represented by UV/ hydrogen peroxide (H2O2) and UV/peroxydisulfate (PDS) systems, respectively, to degrade humic acid (HA) in the presence of halide ions (Cl− and Br−). The effects of different operational parameters, such as oxidant dosages, halide ions concentration, and pH on HA degradation were investigated in UV/H2O2/Cl−, UV/PDS/Cl−, UV/H2O2/Br−, and UV/PDS/Br− processes. It was found that the oxidation capacity of H2O2 and PDS to HA degradation in the presence of halides was nearly in the same order. High dosage of peroxides would lead to an increase in HA removal while excess dosage would slightly inhibit the efficiency. Both Cl− and Br− would have depressing impact on the two AOPs, but the inhibiting effect of Br− was more obvious than that of Cl−, even the concentration of Cl− was far above that of Br−. The increasing pH would have an adverse effect on HA decomposition in UV/H2O2 system, whereas there was no significant impact of pH in UV/PDS process. Furthermore, infrared spectrometer was used to provide the information of degraded HA in UV/H2O2/Cl−, UV/PDS/Cl−, UV/H2O2/Br−, and UV/PDS/Br− processes, and halogenated byproducts were identified in using GC-MS analysis in the four processes. The present research might have significant technical implications on water treatment using advanced oxidation technologies.
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Acknowledgments
This work was financially supported by National Natural Science Foundation of China (NSFC) (No. 41273108 and 21377023), Fundamental Research funds for Central Universities (2232013A3-08) and DHU Distinguished Young Professor Program (15D211303) and Shanghai Pujiang Program. Dr. X. Lou and Y. Guo thank Chinese Universities Scientific Fund (Nos. 13D311303 and 14D311304) for the financial support. Dr. Y. Guo also appreciates the Shanghai Sailing Program (15YF1404300), Shanghai University Youth Teacher Funding Program (ZZZZEGD15011), and Scientific Research Fund Project of Shanghai Second Polytechnic University (EGD15XQD02).
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Lou, X., Xiao, D., Fang, C. et al. Comparison of UV/hydrogen peroxide and UV/peroxydisulfate processes for the degradation of humic acid in the presence of halide ions. Environ Sci Pollut Res 23, 4778–4785 (2016). https://doi.org/10.1007/s11356-015-5232-x
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DOI: https://doi.org/10.1007/s11356-015-5232-x