Bacteria and fungi inactivation using Fe3+/sunlight, H2O2/sunlight and near neutral photo-Fenton: A comparative study

I. García-Fernández, M.I. Polo-López, I. Oller, Pilar Fernandez-Ibanez

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

Wastewater reuse is becoming increasingly important for water sustainability, and is essential for the enhancement of access to safe water for human needs like drinking water and crop irrigation. The ade- quate treatment of contaminated wastewater is needed so that it may be used to recharge water resources. Therefore, reduction and control of waterborne pathogens are required for appropriate water reuse. Advanced Oxidation Processes, which generate hydroxyl radicals, are promising treatments for water disinfection. The purpose of the current study was to evaluate and compare the effectiveness of three solar treatments; Fe3+ /sunlight, H2 O2 /sunlight, and solar photo-Fenton at near-neutral pH, for the inacti- vation of Fusarium solani and Escherichia coli in water. Different concentrations of Fe3+ (0–50 mg/L), H2 O2 (0–10mg/L) and Fe3+/H2O2 (1/2.5, 5/10, 10/10, 50/10mg/L) were evaluated in bottle reactors (200mL) for 5 h under natural solar light in the Southeast of Spain. The order of efficacy for disinfection of both kinds of microorganisms was: photo-Fenton > H2 O2 /sunlight > Fe3+ /sunlight.The results for bacteria inactivation show that the highest rate was observed using photo-Fenton system with 5 mg/L of Fe3+ and 10 mg/L of H2 O2 , which gave a 5-log inactivation of E. coli in 10 min (0.96 kJ/L). The best results for Fusarium inactivation were found using 2.5 mg/L of Fe3+ and 5 mg/L of H2 O2 , which gave a 3.4-log decrease in 3 h of solar exposure (14.47 kJ/L). Moreover, sunlight with H2 O2 alone showed good potential for water disinfection with only low doses of H2 O2 (10 mg/L) required for 6-log inactivation of E. coli and a 3-log inactivation of F. solani.In all cases studied, the inactivation pattern and rate is observed to be highly dependent on the type of microorganism. The spores of F. solani were more resistant than the vegetative cells of E. coli to the solar treatments.
LanguageEnglish
Pages20-29
JournalApplied Catalysis B: Environmental
Volume121-12
DOIs
Publication statusPublished - 28 Mar 2012

Fingerprint

Fungi
comparative study
Bacteria
fungus
Escherichia coli
bacterium
Water
Disinfection
disinfection
Microorganisms
water
microorganism
Wastewater
wastewater
hydroxyl radical
Bottles
Pathogens
spore
recharge
Water resources

Keywords

  • Fusarium solani
  • Escherichia coli
  • Solar photo-Fenton
  • Solar disinfection
  • Hydrogen peroxide

Cite this

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title = "Bacteria and fungi inactivation using Fe3+/sunlight, H2O2/sunlight and near neutral photo-Fenton: A comparative study",
abstract = "Wastewater reuse is becoming increasingly important for water sustainability, and is essential for the enhancement of access to safe water for human needs like drinking water and crop irrigation. The ade- quate treatment of contaminated wastewater is needed so that it may be used to recharge water resources. Therefore, reduction and control of waterborne pathogens are required for appropriate water reuse. Advanced Oxidation Processes, which generate hydroxyl radicals, are promising treatments for water disinfection. The purpose of the current study was to evaluate and compare the effectiveness of three solar treatments; Fe3+ /sunlight, H2 O2 /sunlight, and solar photo-Fenton at near-neutral pH, for the inacti- vation of Fusarium solani and Escherichia coli in water. Different concentrations of Fe3+ (0–50 mg/L), H2 O2 (0–10mg/L) and Fe3+/H2O2 (1/2.5, 5/10, 10/10, 50/10mg/L) were evaluated in bottle reactors (200mL) for 5 h under natural solar light in the Southeast of Spain. The order of efficacy for disinfection of both kinds of microorganisms was: photo-Fenton > H2 O2 /sunlight > Fe3+ /sunlight.The results for bacteria inactivation show that the highest rate was observed using photo-Fenton system with 5 mg/L of Fe3+ and 10 mg/L of H2 O2 , which gave a 5-log inactivation of E. coli in 10 min (0.96 kJ/L). The best results for Fusarium inactivation were found using 2.5 mg/L of Fe3+ and 5 mg/L of H2 O2 , which gave a 3.4-log decrease in 3 h of solar exposure (14.47 kJ/L). Moreover, sunlight with H2 O2 alone showed good potential for water disinfection with only low doses of H2 O2 (10 mg/L) required for 6-log inactivation of E. coli and a 3-log inactivation of F. solani.In all cases studied, the inactivation pattern and rate is observed to be highly dependent on the type of microorganism. The spores of F. solani were more resistant than the vegetative cells of E. coli to the solar treatments.",
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Bacteria and fungi inactivation using Fe3+/sunlight, H2O2/sunlight and near neutral photo-Fenton: A comparative study. / García-Fernández, I.; Polo-López, M.I.; Oller, I.; Fernandez-Ibanez, Pilar.

In: Applied Catalysis B: Environmental, Vol. 121-12, 28.03.2012, p. 20-29.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Bacteria and fungi inactivation using Fe3+/sunlight, H2O2/sunlight and near neutral photo-Fenton: A comparative study

AU - García-Fernández, I.

AU - Polo-López, M.I.

AU - Oller, I.

AU - Fernandez-Ibanez, Pilar

PY - 2012/3/28

Y1 - 2012/3/28

N2 - Wastewater reuse is becoming increasingly important for water sustainability, and is essential for the enhancement of access to safe water for human needs like drinking water and crop irrigation. The ade- quate treatment of contaminated wastewater is needed so that it may be used to recharge water resources. Therefore, reduction and control of waterborne pathogens are required for appropriate water reuse. Advanced Oxidation Processes, which generate hydroxyl radicals, are promising treatments for water disinfection. The purpose of the current study was to evaluate and compare the effectiveness of three solar treatments; Fe3+ /sunlight, H2 O2 /sunlight, and solar photo-Fenton at near-neutral pH, for the inacti- vation of Fusarium solani and Escherichia coli in water. Different concentrations of Fe3+ (0–50 mg/L), H2 O2 (0–10mg/L) and Fe3+/H2O2 (1/2.5, 5/10, 10/10, 50/10mg/L) were evaluated in bottle reactors (200mL) for 5 h under natural solar light in the Southeast of Spain. The order of efficacy for disinfection of both kinds of microorganisms was: photo-Fenton > H2 O2 /sunlight > Fe3+ /sunlight.The results for bacteria inactivation show that the highest rate was observed using photo-Fenton system with 5 mg/L of Fe3+ and 10 mg/L of H2 O2 , which gave a 5-log inactivation of E. coli in 10 min (0.96 kJ/L). The best results for Fusarium inactivation were found using 2.5 mg/L of Fe3+ and 5 mg/L of H2 O2 , which gave a 3.4-log decrease in 3 h of solar exposure (14.47 kJ/L). Moreover, sunlight with H2 O2 alone showed good potential for water disinfection with only low doses of H2 O2 (10 mg/L) required for 6-log inactivation of E. coli and a 3-log inactivation of F. solani.In all cases studied, the inactivation pattern and rate is observed to be highly dependent on the type of microorganism. The spores of F. solani were more resistant than the vegetative cells of E. coli to the solar treatments.

AB - Wastewater reuse is becoming increasingly important for water sustainability, and is essential for the enhancement of access to safe water for human needs like drinking water and crop irrigation. The ade- quate treatment of contaminated wastewater is needed so that it may be used to recharge water resources. Therefore, reduction and control of waterborne pathogens are required for appropriate water reuse. Advanced Oxidation Processes, which generate hydroxyl radicals, are promising treatments for water disinfection. The purpose of the current study was to evaluate and compare the effectiveness of three solar treatments; Fe3+ /sunlight, H2 O2 /sunlight, and solar photo-Fenton at near-neutral pH, for the inacti- vation of Fusarium solani and Escherichia coli in water. Different concentrations of Fe3+ (0–50 mg/L), H2 O2 (0–10mg/L) and Fe3+/H2O2 (1/2.5, 5/10, 10/10, 50/10mg/L) were evaluated in bottle reactors (200mL) for 5 h under natural solar light in the Southeast of Spain. The order of efficacy for disinfection of both kinds of microorganisms was: photo-Fenton > H2 O2 /sunlight > Fe3+ /sunlight.The results for bacteria inactivation show that the highest rate was observed using photo-Fenton system with 5 mg/L of Fe3+ and 10 mg/L of H2 O2 , which gave a 5-log inactivation of E. coli in 10 min (0.96 kJ/L). The best results for Fusarium inactivation were found using 2.5 mg/L of Fe3+ and 5 mg/L of H2 O2 , which gave a 3.4-log decrease in 3 h of solar exposure (14.47 kJ/L). Moreover, sunlight with H2 O2 alone showed good potential for water disinfection with only low doses of H2 O2 (10 mg/L) required for 6-log inactivation of E. coli and a 3-log inactivation of F. solani.In all cases studied, the inactivation pattern and rate is observed to be highly dependent on the type of microorganism. The spores of F. solani were more resistant than the vegetative cells of E. coli to the solar treatments.

KW - Fusarium solani

KW - Escherichia coli

KW - Solar photo-Fenton

KW - Solar disinfection

KW - Hydrogen peroxide

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DO - 10.1016/j.apcatb.2012.03.012

M3 - Article

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SP - 20

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JO - Applied Catalysis B: Environmental

T2 - Applied Catalysis B: Environmental

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SN - 0926-3373

ER -