Effects of experimental conditions on E. coli survival during solar photocatalytic water disinfection

Cosima Sichel, Julián Blanco, Sixto Malato, P Fernandez Ibanez

Research output: Contribution to journalArticle

87 Citations (Scopus)

Abstract

Results of photocatalytic disinfection of Escherichia coli K12 in water in a compound parabolic collector (CPC) solar reactor are reported. The aim of the study is to quantify the influence of operating parameters, such as flow rate, water quality and bacterial concentration, on bacterial viability in solar photocatalysis and in the dark. The catalyst used was an industrial titanium-dioxide-coated paper matrix fixed on a tubular support in the focus of the CPC. Addition of TiO2 notably improved solar-only disinfection up to 6 logs disinfection in 90 min. Between 10 and 2 L/min, photocatalytic disinfection effectiveness tended to increase with decreasing flow rates.In dark experiments, inactivation of 99% of viable E. coli cells in distilled water was detected after 90 min of recirculation at 10 L/min in the CPC reactor. A detailed study of bacterial viability in the solar reactor in the dark was therefore performed, varying flow rates, initial concentrations and osmolarity. It was found that bacterial viability in the reactor strongly depends on all the parameters examined, so that disinfection and dark inactivation overlap when working under low-osmolarity conditions and low bacterial concentrations.
LanguageEnglish
Pages239-246
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume189
Issue number2-3
Early online date11 Feb 2007
DOIs
Publication statusE-pub ahead of print - 11 Feb 2007

Fingerprint

Disinfection
Escherichia coli
reactors
viability
Water
flow velocity
deactivation
accumulators
water
Flow rate
solar collectors
water quality
Escherichia
titanium oxides
Photocatalysis
Solar collectors
Titanium dioxide
Water quality
catalysts
matrices

Keywords

  • flow rate
  • solar reactor
  • compound parabolic collector
  • solar photocatalytic disinfection

Cite this

Sichel, Cosima ; Blanco, Julián ; Malato, Sixto ; Fernandez Ibanez, P. / Effects of experimental conditions on E. coli survival during solar photocatalytic water disinfection. 2007 ; Vol. 189, No. 2-3. pp. 239-246.
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abstract = "Results of photocatalytic disinfection of Escherichia coli K12 in water in a compound parabolic collector (CPC) solar reactor are reported. The aim of the study is to quantify the influence of operating parameters, such as flow rate, water quality and bacterial concentration, on bacterial viability in solar photocatalysis and in the dark. The catalyst used was an industrial titanium-dioxide-coated paper matrix fixed on a tubular support in the focus of the CPC. Addition of TiO2 notably improved solar-only disinfection up to 6 logs disinfection in 90 min. Between 10 and 2 L/min, photocatalytic disinfection effectiveness tended to increase with decreasing flow rates.In dark experiments, inactivation of 99{\%} of viable E. coli cells in distilled water was detected after 90 min of recirculation at 10 L/min in the CPC reactor. A detailed study of bacterial viability in the solar reactor in the dark was therefore performed, varying flow rates, initial concentrations and osmolarity. It was found that bacterial viability in the reactor strongly depends on all the parameters examined, so that disinfection and dark inactivation overlap when working under low-osmolarity conditions and low bacterial concentrations.",
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Effects of experimental conditions on E. coli survival during solar photocatalytic water disinfection. / Sichel, Cosima; Blanco, Julián; Malato, Sixto; Fernandez Ibanez, P.

Vol. 189, No. 2-3, 11.02.2007, p. 239-246.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effects of experimental conditions on E. coli survival during solar photocatalytic water disinfection

AU - Sichel, Cosima

AU - Blanco, Julián

AU - Malato, Sixto

AU - Fernandez Ibanez, P

PY - 2007/2/11

Y1 - 2007/2/11

N2 - Results of photocatalytic disinfection of Escherichia coli K12 in water in a compound parabolic collector (CPC) solar reactor are reported. The aim of the study is to quantify the influence of operating parameters, such as flow rate, water quality and bacterial concentration, on bacterial viability in solar photocatalysis and in the dark. The catalyst used was an industrial titanium-dioxide-coated paper matrix fixed on a tubular support in the focus of the CPC. Addition of TiO2 notably improved solar-only disinfection up to 6 logs disinfection in 90 min. Between 10 and 2 L/min, photocatalytic disinfection effectiveness tended to increase with decreasing flow rates.In dark experiments, inactivation of 99% of viable E. coli cells in distilled water was detected after 90 min of recirculation at 10 L/min in the CPC reactor. A detailed study of bacterial viability in the solar reactor in the dark was therefore performed, varying flow rates, initial concentrations and osmolarity. It was found that bacterial viability in the reactor strongly depends on all the parameters examined, so that disinfection and dark inactivation overlap when working under low-osmolarity conditions and low bacterial concentrations.

AB - Results of photocatalytic disinfection of Escherichia coli K12 in water in a compound parabolic collector (CPC) solar reactor are reported. The aim of the study is to quantify the influence of operating parameters, such as flow rate, water quality and bacterial concentration, on bacterial viability in solar photocatalysis and in the dark. The catalyst used was an industrial titanium-dioxide-coated paper matrix fixed on a tubular support in the focus of the CPC. Addition of TiO2 notably improved solar-only disinfection up to 6 logs disinfection in 90 min. Between 10 and 2 L/min, photocatalytic disinfection effectiveness tended to increase with decreasing flow rates.In dark experiments, inactivation of 99% of viable E. coli cells in distilled water was detected after 90 min of recirculation at 10 L/min in the CPC reactor. A detailed study of bacterial viability in the solar reactor in the dark was therefore performed, varying flow rates, initial concentrations and osmolarity. It was found that bacterial viability in the reactor strongly depends on all the parameters examined, so that disinfection and dark inactivation overlap when working under low-osmolarity conditions and low bacterial concentrations.

KW - flow rate

KW - solar reactor

KW - compound parabolic collector

KW - solar photocatalytic disinfection

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