Inactivation of water pathogens with solar photo-activated persulfate oxidation

L. C. Ferreira, M. Castro-Alférez, S. Nahim-Granados, M. I. Polo-López, M. S. Lucas, G. Li Puma, P. Fernández-Ibáñez

    Research output: Contribution to journalArticle

    Abstract

    The effect of solar activated persulfate oxidation and solar mild thermal heating on water disinfection (PS/solar) was demonstrated for the inactivation of E. coli and E. faecalis in both isotonic water (IW) and synthetic urban wastewater (SUWW). The process was studied in both bench-scale and pilot-scale (60 L CPC solar compound parabolic collector) reactors. The impact of solar ultraviolet (UV) and thermal increase on bacterial inactivation were separately studied. The thermal inactivation at 40 °C and 0.5 mM-PS shows a 3-log reduction value (LRV) for E. coli without lag phase and 5-LRV for E. faecalis with a lag phase of 1 h, during 4 h solar exposure. The thermal effect at 50 °C played a dominant role, with fast bacterial decay for both bacteria, which dominates the kinetics over the thermal activation of PS. In the presence of PS and solar irradiation, the combined thermal and UVA effects, accelerated the bacterial process. 6-LRV in E. coli and E. faecalis was observed after solar exposure periods of 20 min (solar dose), using 0.5 and 0.7 mM of PS in IW, respectively. Longer solar exposure times were required to attain similar LRV in synthetic urban wastewater, in the presence of 25 mg/L of organic matter, i.e. 80 and 100 min (solar dose) for E. coli and E. faecalis, respectively. These results were confirmed at pilot scale, where 60 L of IW were treated with 0.5 mM of PS in 50 min (solar dose). The PS/solar process uses low cost chemical reagents (0.5 mM-PS) and a free source of energy (solar radiation) for the treatment of wastewater and is able to achieve the high removals (6-LRV) of the two model faecal indicators of water contamination. This process opens a clear alternative to treat polluted water with organic matter and pathogens with implications in water-energy reclamation field.

    LanguageEnglish
    Article number122275
    JournalChemical Engineering Journal
    Volume381
    Early online date19 Jul 2019
    DOIs
    Publication statusE-pub ahead of print - 19 Jul 2019

    Fingerprint

    Pathogens
    pathogen
    oxidation
    Oxidation
    Water
    Escherichia coli
    Wastewater
    water
    Biological materials
    organic matter
    Disinfection
    Reclamation
    Solar radiation
    temperature effect
    disinfection
    Thermal effects
    energy
    solar radiation
    Bacteria
    irradiation

    Keywords

    • Compound parabolic collector
    • Persulfate
    • Solar thermal
    • Solar UVA
    • Sulfate radicals
    • Water disinfection

    Cite this

    Ferreira, L. C., Castro-Alférez, M., Nahim-Granados, S., Polo-López, M. I., Lucas, M. S., Li Puma, G., & Fernández-Ibáñez, P. (2020). Inactivation of water pathogens with solar photo-activated persulfate oxidation. Chemical Engineering Journal, 381, [122275]. https://doi.org/10.1016/j.cej.2019.122275
    Ferreira, L. C. ; Castro-Alférez, M. ; Nahim-Granados, S. ; Polo-López, M. I. ; Lucas, M. S. ; Li Puma, G. ; Fernández-Ibáñez, P. / Inactivation of water pathogens with solar photo-activated persulfate oxidation. In: Chemical Engineering Journal. 2020 ; Vol. 381.
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    abstract = "The effect of solar activated persulfate oxidation and solar mild thermal heating on water disinfection (PS/solar) was demonstrated for the inactivation of E. coli and E. faecalis in both isotonic water (IW) and synthetic urban wastewater (SUWW). The process was studied in both bench-scale and pilot-scale (60 L CPC solar compound parabolic collector) reactors. The impact of solar ultraviolet (UV) and thermal increase on bacterial inactivation were separately studied. The thermal inactivation at 40 °C and 0.5 mM-PS shows a 3-log reduction value (LRV) for E. coli without lag phase and 5-LRV for E. faecalis with a lag phase of 1 h, during 4 h solar exposure. The thermal effect at 50 °C played a dominant role, with fast bacterial decay for both bacteria, which dominates the kinetics over the thermal activation of PS. In the presence of PS and solar irradiation, the combined thermal and UVA effects, accelerated the bacterial process. 6-LRV in E. coli and E. faecalis was observed after solar exposure periods of 20 min (solar dose), using 0.5 and 0.7 mM of PS in IW, respectively. Longer solar exposure times were required to attain similar LRV in synthetic urban wastewater, in the presence of 25 mg/L of organic matter, i.e. 80 and 100 min (solar dose) for E. coli and E. faecalis, respectively. These results were confirmed at pilot scale, where 60 L of IW were treated with 0.5 mM of PS in 50 min (solar dose). The PS/solar process uses low cost chemical reagents (0.5 mM-PS) and a free source of energy (solar radiation) for the treatment of wastewater and is able to achieve the high removals (6-LRV) of the two model faecal indicators of water contamination. This process opens a clear alternative to treat polluted water with organic matter and pathogens with implications in water-energy reclamation field.",
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    Ferreira, LC, Castro-Alférez, M, Nahim-Granados, S, Polo-López, MI, Lucas, MS, Li Puma, G & Fernández-Ibáñez, P 2020, 'Inactivation of water pathogens with solar photo-activated persulfate oxidation', Chemical Engineering Journal, vol. 381, 122275. https://doi.org/10.1016/j.cej.2019.122275

    Inactivation of water pathogens with solar photo-activated persulfate oxidation. / Ferreira, L. C.; Castro-Alférez, M.; Nahim-Granados, S.; Polo-López, M. I.; Lucas, M. S.; Li Puma, G.; Fernández-Ibáñez, P.

    In: Chemical Engineering Journal, Vol. 381, 122275, 01.02.2020.

    Research output: Contribution to journalArticle

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    AU - Ferreira, L. C.

    AU - Castro-Alférez, M.

    AU - Nahim-Granados, S.

    AU - Polo-López, M. I.

    AU - Lucas, M. S.

    AU - Li Puma, G.

    AU - Fernández-Ibáñez, P.

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    Ferreira LC, Castro-Alférez M, Nahim-Granados S, Polo-López MI, Lucas MS, Li Puma G et al. Inactivation of water pathogens with solar photo-activated persulfate oxidation. Chemical Engineering Journal. 2020 Feb 1;381. 122275. https://doi.org/10.1016/j.cej.2019.122275