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Solar-Enhanced Advanced Oxidation Processes for Water Treatment: Simultaneous Removal of Pathogens and Chemical Pollutants

Author

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  • Oyuna Tsydenova

    (Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences, Sakhyanova st. 6, Ulan-Ude City 670047, Russia)

  • Valeriy Batoev

    (Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences, Sakhyanova st. 6, Ulan-Ude City 670047, Russia)

  • Agniya Batoeva

    (Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences, Sakhyanova st. 6, Ulan-Ude City 670047, Russia)

Abstract

The review explores the feasibility of simultaneous removal of pathogens and chemical pollutants by solar-enhanced advanced oxidation processes (AOPs). The AOPs are based on in-situ generation of reactive oxygen species (ROS), most notably hydroxyl radicals •OH, that are capable of destroying both pollutant molecules and pathogen cells. The review presents evidence of simultaneous removal of pathogens and chemical pollutants by photocatalytic processes, namely TiO 2 photocatalysis and photo-Fenton. Complex water matrices with high loads of pathogens and chemical pollutants negatively affect the efficiency of disinfection and pollutant removal. This is due to competition between chemical substances and pathogens for generated ROS. Other possible negative effects include light screening, competitive photon absorption, adsorption on the catalyst surface (thereby inhibiting its photocatalytic activity), etc. Besides, some matrix components may serve as nutrients for pathogens, thus hindering the disinfection process. Each type of water/wastewater would require a tailor-made approach and the variables that were shown to influence the processes—catalyst/oxidant concentrations, incident radiation flux, and pH—need to be adjusted in order to achieve the required degree of pollutant and pathogen removal. Overall, the solar-enhanced AOPs hold promise as an environmentally-friendly way to substitute or supplement conventional water/wastewater treatment, particularly in areas without access to centralized drinking water or sewage/wastewater treatment facilities.

Suggested Citation

  • Oyuna Tsydenova & Valeriy Batoev & Agniya Batoeva, 2015. "Solar-Enhanced Advanced Oxidation Processes for Water Treatment: Simultaneous Removal of Pathogens and Chemical Pollutants," IJERPH, MDPI, vol. 12(8), pages 1-20, August.
    • Handle: RePEc:gam:jijerp:v:12:y:2015:i:8:p:9542-9561:d:54198
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    References listed on IDEAS

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    1. Blanco, J. & Malato, S. & Fernández-Ibañez, P. & Alarcón, D. & Gernjak, W. & Maldonado, M.I., 2009. "Review of feasible solar energy applications to water processes," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(6-7), pages 1437-1445, August.
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    Cited by:

    1. Bingbing Hu & Peng Zhang & Hui Liu & Songhu Yuan, 2022. "Quantification of the Influence of Citrate/Fe(II) Molar Ratio on Hydroxyl Radical Production and Pollutant Degradation during Fe(II)-Catalyzed O 2 and H 2 O 2 Oxidation Processes," IJERPH, MDPI, vol. 19(19), pages 1-14, October.

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