Inactivation of natural enteric bacteria in real municipal wastewater by solar photo-Fenton at neutral pH

E. Ortega-Gómez, B. Esteban García, M.M. Ballesteros Martín, Pilar Fernandez-Ibanez, J.A. Sánchez Pérez

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

This study analyses the use of the solar photo-Fenton treatment in compound parabolic collector photo-reactors at neutral pH for the inactivation of wild enteric Escherichia coli and total coliform present in secondary effluents of a municipal wastewater treatment plant (SEWWTP). Control experiments were carried out to find out the individual effects of mechanical stress, pH, reactants concentration, and UVA radiation as well as the combined effects of UVA-Fe and UVA-H2O2. The synergistic germicidal effect of solar-UVA with 50 mg L(-1) of H2O2 led to complete disinfection (up to the detection limit) of total coliforms within 120 min. The disinfection process was accelerated by photo-Fenton, achieving total inactivation in 60 min reducing natural bicarbonate concentration found in the SEWWTP from 250 to 100 mg L(-1) did not give rise to a significant enhancement in bacterial inactivation. Additionally, the effect of hydrogen peroxide and iron dosage was evaluated. The best conditions were 50 mg L(-1) of H2O2 and 20 mg L(-1) of Fe(2+). Due to the variability of the SEWWTP during autumn and winter seasons, the inactivation kinetic constant varied between 0.07 ± 0.04 and 0.17 ± 0.04 min(-1). Moreover, the water treated by solar photo-Fenton fulfilled the microbiological quality requirement for wastewater reuse in irrigation as per the WHO guidelines and in particular for Spanish legislation.
LanguageEnglish
Pages316-324
JournalWater Research
Volume63
DOIs
Publication statusAccepted/In press - 19 May 2014

Fingerprint

Wastewater treatment
Effluents
Bacteria
Wastewater
Disinfection
wastewater
bacterium
effluent
disinfection
Irrigation
Hydrogen peroxide
Escherichia coli
bicarbonate
hydrogen peroxide
Iron
Radiation
legislation
Kinetics
autumn
irrigation

Keywords

  • Escherichia coli
  • Neutral pH
  • Photo-Fenton
  • Reclaimed water
  • Solar disinfection
  • Total coliform

Cite this

Ortega-Gómez, E., Esteban García, B., Ballesteros Martín, M. M., Fernandez-Ibanez, P., & Sánchez Pérez, J. A. (Accepted/In press). Inactivation of natural enteric bacteria in real municipal wastewater by solar photo-Fenton at neutral pH. Water Research, 63, 316-324. https://doi.org/10.1016/j.watres.2014.05.034
Ortega-Gómez, E. ; Esteban García, B. ; Ballesteros Martín, M.M. ; Fernandez-Ibanez, Pilar ; Sánchez Pérez, J.A. / Inactivation of natural enteric bacteria in real municipal wastewater by solar photo-Fenton at neutral pH. In: Water Research. 2014 ; Vol. 63. pp. 316-324.
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Inactivation of natural enteric bacteria in real municipal wastewater by solar photo-Fenton at neutral pH. / Ortega-Gómez, E.; Esteban García, B.; Ballesteros Martín, M.M.; Fernandez-Ibanez, Pilar; Sánchez Pérez, J.A.

In: Water Research, Vol. 63, 19.05.2014, p. 316-324.

Research output: Contribution to journalArticle

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T1 - Inactivation of natural enteric bacteria in real municipal wastewater by solar photo-Fenton at neutral pH

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AU - Esteban García, B.

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AU - Fernandez-Ibanez, Pilar

AU - Sánchez Pérez, J.A.

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AB - This study analyses the use of the solar photo-Fenton treatment in compound parabolic collector photo-reactors at neutral pH for the inactivation of wild enteric Escherichia coli and total coliform present in secondary effluents of a municipal wastewater treatment plant (SEWWTP). Control experiments were carried out to find out the individual effects of mechanical stress, pH, reactants concentration, and UVA radiation as well as the combined effects of UVA-Fe and UVA-H2O2. The synergistic germicidal effect of solar-UVA with 50 mg L(-1) of H2O2 led to complete disinfection (up to the detection limit) of total coliforms within 120 min. The disinfection process was accelerated by photo-Fenton, achieving total inactivation in 60 min reducing natural bicarbonate concentration found in the SEWWTP from 250 to 100 mg L(-1) did not give rise to a significant enhancement in bacterial inactivation. Additionally, the effect of hydrogen peroxide and iron dosage was evaluated. The best conditions were 50 mg L(-1) of H2O2 and 20 mg L(-1) of Fe(2+). Due to the variability of the SEWWTP during autumn and winter seasons, the inactivation kinetic constant varied between 0.07 ± 0.04 and 0.17 ± 0.04 min(-1). Moreover, the water treated by solar photo-Fenton fulfilled the microbiological quality requirement for wastewater reuse in irrigation as per the WHO guidelines and in particular for Spanish legislation.

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KW - Solar disinfection

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