Improving ferrate disinfection and decontamination performance at neutral pH by activating peroxymonosulfate under solar light

In this work, the effect of solar light as a “reducing agent” in Fe(VI)/PMS process for disinfection and decontamination of water was investigated. Single, double and triple-factor disinfection processes were systematically studied against Escherichia coli and validated on sulfamethoxazole. The experiments performed with PMS or Fe(VI) in dark conditions only achieved 1-log reduction in 2 h, while no significant enhancement was found in the Fe(VI)/PMS system. The introduction of solar light in either PMS or Fe(VI) process enhanced the E. coli inactivation, and complete inactivation (6-log) was reached at 90 min. However, the best improvement was achieved with the triple-factor disinfection process (Fe(VI)/PMS/solar light) which presented 6-log reduction at only 40 min. In the case of sulfamethoxazole, more than 70% removal was achieved under the Fe(VI)/PMS/solar light system, while only about 20% was observed with single and double-factor processes. Our study revealed the light spectrum distribution effects and the iron speciation implications. A main role for HO. and the participation of SO4.- was found, without overlooking the direct effects of solar light and PMS itself, as well as the possible involvement of other transient species. Overall, the efficacy of the Fe(VI)/PMS/solar light process against a series of microorganisms combined with the effectiveness at near-neutral pH, suggest its suitability for further assessment in disinfection and/or decontamination of water.

Bibliographic Details

Main Authors:	López-Vinent, Núria, Cruz-Alcalde, Alberto, Moussavi, Gholamreza, del Castillo Gonzalez, Isabel, Hernandez Lehmann, Aurelio, Giménez, Jaime, Giannakis, Stefanos
Format:	artículo biblioteca
Language:	English
Published:	Elsevier 2022-12-15
Subjects:	Water treatment, E. coli, Ferrate, Persulfate, Radical oxidation, Solar disinfection (SODIS),
Online Access:	http://hdl.handle.net/10261/278358 https://api.elsevier.com/content/abstract/scopus_id/85133917987
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