Abstract
Surface discharge plasma (SDP) combined with activated carbon (AC) was employed to eliminate dissolved organic matter from micro-polluted source water, with humic acid (HA) as the model pollutant. Synergistic effect on HA removal was observed in the SDP-AC system; HA removal efficiency reached 60.9% within 5-min treatment in the SDP-AC system with 5.0 g AC addition, whereas 16.7 and 17.4% of HA were removed in sole SDP system and AC adsorption, respectively. Scanning electron microscope and Boehm titration analysis showed that chemical reactions between active species and functional groups of AC occurred. The existence of isopropanol or benzoquinone exhibited inhibitive effects on HA removal in the SDP system, while these inhibitive effects were weakened in the SDP-AC system. The influences of AC on ozone equivalent concentration and H2O2 concentration were evaluated, and there were approximately 39 and 20% decline in ozone equivalent concentration and H2O2 concentration within 6-min treatment in the SDP-AC system, respectively, compared with those in the sole SDP system. Dissolved organic carbon, specific ultraviolet absorbance, and UV absorption ratios analysis demonstrated that the SDP treatment destroyed the chromophoric groups, double bonds, and aromatic structure of HA molecules, and these destructive actions were strengthened by AC.
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Acknowledgements
The authors thank the projects funded by the National Natural Science Foundation, P.R. China (51608448), and Fundamental Research Fund for the Central Universities (Z109021617), and National Natural Science Foundation, P.R. China (51308460), for the financial supports to this research.
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Responsible editor: Bingcai Pan
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Wang, T., Li, Y., Qu, G. et al. Enhanced removal of humic acid from micro-polluted source water in a surface discharge plasma system coupled with activated carbon. Environ Sci Pollut Res 24, 21591–21600 (2017). https://doi.org/10.1007/s11356-017-9807-6
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DOI: https://doi.org/10.1007/s11356-017-9807-6