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Int. J. Environ. Res. Public Health 2015, 12(8), 9542-9561; doi:10.3390/ijerph120809542

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

Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences, Sakhyanova st. 6, Ulan-Ude City 670047, Russia
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Author to whom correspondence should be addressed.
Academic Editor: Miklas Scholz
Received: 22 June 2015 / Revised: 19 July 2015 / Accepted: 27 July 2015 / Published: 14 August 2015
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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 TiO2 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. View Full-Text
Keywords: water/wastewater treatment; solar-enhanced AOPs; disinfection; pathogen inactivation; pollutant degradation; simultaneous removal; photo-Fenton; TiO2 photocatalysis water/wastewater treatment; solar-enhanced AOPs; disinfection; pathogen inactivation; pollutant degradation; simultaneous removal; photo-Fenton; TiO2 photocatalysis
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tsydenova, O.; Batoev, V.; Batoeva, A. Solar-Enhanced Advanced Oxidation Processes for Water Treatment: Simultaneous Removal of Pathogens and Chemical Pollutants. Int. J. Environ. Res. Public Health 2015, 12, 9542-9561.

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Int. J. Environ. Res. Public Health EISSN 1660-4601 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
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