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Disinfection of water inoculated with Enterococcus faecalis using solar/Fe(III)EDDS-H 2 O 2 or S 2 O 8 2− process

Bianco, A., Polo−López, M.I., Fernandez-Ibanez, P, Brigante, M. and Mailhot, G. (2017) Disinfection of water inoculated with Enterococcus faecalis using solar/Fe(III)EDDS-H 2 O 2 or S 2 O 8 2− process. Water Research, 118 . pp. 249-260. [Journal article]

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URL: http://dx.doi.org/10.1016/j.watres.2017.03.061

DOI: 10.1016/j.watres.2017.03.061

Abstract

In this study, the activation of H2O2 and persulfate ions induced by solar photolysis of Fe(III)EDDS complex were investigated in water disinfection, applying solar AOPs processes. The use of Fe(III)EDDS complex maintains iron in soluble form until slightly basic pH and so the photolysis is efficient in a large range of pH compatible with natural waters. Moreover, for the first time, the impact of photogenerated hydroxyl and sulfate radicals on the inactivation of Enterococcus faecalis in water was studied. E. faecalis was proposed as alternative model microorganism given its higher resistance than the commonly used E. coli.The reactivity of hydroxyl radicals seems to be more efficient for the inactivation of such strain than the reactivity of sulfate radicals. Moreover, experimental results show that the concentration of Fe(III) EDDS complex is a key parameter for the inactivation of microrganisms. For the direct application in natural waters, the efficiency of the process in the presence of ubiquitous inorganic compounds, such as carbonate (HCO 3/CO23 ) and chloride ions (Cl ), was also investigated. Carbonates showed a strong reduction on the E. faecalis inactivation in all cases; meanwhile chloride ions enhanced the inactivation in the presence of persulfate as also shown by using a complementary kinetic modeling approach. A dual role of Fe(III)EDDS complex was established and discussed; essential for the generation of radical species but a trap for the reactivity of these same radicals.

Item Type:Journal article
Keywords:Wastewater disinfection; Fenton reaction; Persulfate activation; Photochemistry; Iron complex; Kinetic modeling
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:37873
Deposited By: Dr Pilar Fernandez-Ibanez
Deposited On:16 May 2017 09:13
Last Modified:17 Oct 2017 16:29

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