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Solar light (hv) and H2O2/hv photo-disinfection of natural alkaline water (pH 8.6) in a compound parabolic collector at different day periods in Sahelian region

Abstract

The photo-disinfection of natural alkaline surface water (pH 8.6 ± 0.3) for drinking purposes was carried out under solar radiation treatments. The enteric bacteria studied were the wild total coliforms/Escherichia coli (104 CFU/ml) and Salmonella spp. (104 CFU/ml) naturally present in the water. The photo-disinfection of a 25-l water sample was carried out in a solar compound parabolic collector (CPC) in the absence and in the presence of hydrogen peroxide (H2O2). The addition of H2O2 (10 mg/L) to the sample water was sufficient to enhance the photo-disinfection and ensure an irreversible lethal action on the wild enteric bacteria contents of the sample. The inactivation kinetic of the system was significantly enhanced compared to the one carried out without H2O2 addition. The effect of the solar radiation parameters on the efficiency of the photo-disinfection were assessed. The pH has increased during the treatment in all the photo-disinfection processes (hv and H2O2/hv). The Salmonella spp strain has shown the best effective inactivate time in alkaline water than the one recorded under acidic or near-neutral conditions. The evolution of some physico-chemical parameters of the water (turbidity, NO2 , NO3 , NH4 +, HPO4 2−, and bicarbonate (HCO3 )) was monitored during the treatment. Finally, the possible mechanistic process involved during the enteric bacteria inactivation was suggested.

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Acknowledgments

The present study was supported by the Swiss Development Agency (SDC) and the Erna Hamburger Foundation. We thank Jean-Marc Froehlich for his skillful support during this study and Barbara Althaus and Stefanos Giannakis for the English correction.

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Correspondence to C. Pulgarin.

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Responsible editor: Angeles Blanco

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Ndounla, J., Pulgarin, C. Solar light (hv) and H2O2/hv photo-disinfection of natural alkaline water (pH 8.6) in a compound parabolic collector at different day periods in Sahelian region. Environ Sci Pollut Res 22, 17082–17094 (2015). https://doi.org/10.1007/s11356-015-4784-0

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Keywords

  • Solar photo-disinfection
  • H2O2
  • Alkaline water
  • Enteric bacteria
  • Inactivation
  • Compound parabolic collector