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

A. Bianco, M.I. Polo−López, P Fernandez-Ibanez, M. Brigante, G. Mailhot

Research output: Contribution to journalArticle

16 Citations (Scopus)

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.
LanguageEnglish
Pages249-260
JournalWater Research
Volume118
Early online date18 Apr 2017
DOIs
Publication statusE-pub ahead of print - 18 Apr 2017

Fingerprint

Disinfection
disinfection
Photolysis
photolysis
ion
Water
Carbonates
Ions
chloride
sulfate
carbonate
Inorganic compounds
water
inorganic compound
hydroxyl radical
Microorganisms
Escherichia coli
microorganism
Chemical activation
Iron

Keywords

  • Wastewater disinfection
  • Fenton reaction
  • Persulfate activation
  • Photochemistry
  • Iron complex
  • Kinetic modeling

Cite this

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

In: Water Research, Vol. 118, 18.04.2017, p. 249-260.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Disinfection of water inoculated with Enterococcus faecalis using solar/Fe(III)EDDS-H 2 O 2 or S 2 O 8 2− process

AU - Bianco, A.

AU - Polo−López, M.I.

AU - Fernandez-Ibanez, P

AU - Brigante, M.

AU - Mailhot, G.

PY - 2017/4/18

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N2 - 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.

AB - 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.

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KW - Persulfate activation

KW - Photochemistry

KW - Iron complex

KW - Kinetic modeling

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SN - 0043-1354

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