Solar photocatalytic disinfection with immobilised TiO2at pilot-plant scale

Carlos Sordo, Rafael Van Grieken, Javier Marugán, P Fernandez Ibanez

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The photocatalytic disinfection efficiency has been investigated for two immobilized TiO2 catalytic systems (wall reactor and fixed-bed reactor) in a solar pilot plant. Their performances have been compared with the use of a slurry reactor and the solar disinfection without catalyst. The use of photocatalytic TiO2 wall reactors does no show clear benefits over the solar disinfection process in the absence of catalyst. The reason is that the efficiency of the solar disinfection is so high that the presence of titania in the reactor wall reduces the global efficiency due to the competition for the absorption of photons. As expected, the maximum efficiency was shown by the slurry TiO2 reactor, due to the optimum contact between bacteria and catalyst. However,it is noticeable that the use of the fixed-bed reactor leads to inactivation rate quite close to that of the slurry, requiring comparable accumulated solar energy of about 6 kJ L21 to achieve a 6-log decrease in the concentration of viable bacteria and allowing a total disinfection of the water (below the detection limit of 1 CFU mL21). Not only the high titania surface area of this configuration is responsible for the bacteria inactivation but the important contribution of the mechanical stress has to be considered. The main advantage of the fixed-bed TiO2 catalyst is the outstanding stability, without deactivation effects after ten reaction cycles, being readily applicable for continuous water treatment systems.
LanguageEnglish
Pages507
JournalWater Science & Technology
Volume61
Issue number2
DOIs
Publication statusPublished - 17 Apr 2010

Fingerprint

Disinfection
Pilot plants
disinfection
Bacteria
Catalysts
catalyst
slurry
Titanium
titanium
bacterium
Water treatment
Solar energy
Photons
pilot plant
reactor
water treatment
surface area
Water

Keywords

  • disinfection
  • immobilized TiO2
  • photocatalysis
  • pilot-plant
  • solar

Cite this

Sordo, Carlos ; Van Grieken, Rafael ; Marugán, Javier ; Fernandez Ibanez, P. / Solar photocatalytic disinfection with immobilised TiO2at pilot-plant scale. 2010 ; Vol. 61, No. 2. pp. 507.
@article{3c6d68b2a0f44b02883c8231342ab10b,
title = "Solar photocatalytic disinfection with immobilised TiO2at pilot-plant scale",
abstract = "The photocatalytic disinfection efficiency has been investigated for two immobilized TiO2 catalytic systems (wall reactor and fixed-bed reactor) in a solar pilot plant. Their performances have been compared with the use of a slurry reactor and the solar disinfection without catalyst. The use of photocatalytic TiO2 wall reactors does no show clear benefits over the solar disinfection process in the absence of catalyst. The reason is that the efficiency of the solar disinfection is so high that the presence of titania in the reactor wall reduces the global efficiency due to the competition for the absorption of photons. As expected, the maximum efficiency was shown by the slurry TiO2 reactor, due to the optimum contact between bacteria and catalyst. However,it is noticeable that the use of the fixed-bed reactor leads to inactivation rate quite close to that of the slurry, requiring comparable accumulated solar energy of about 6 kJ L21 to achieve a 6-log decrease in the concentration of viable bacteria and allowing a total disinfection of the water (below the detection limit of 1 CFU mL21). Not only the high titania surface area of this configuration is responsible for the bacteria inactivation but the important contribution of the mechanical stress has to be considered. The main advantage of the fixed-bed TiO2 catalyst is the outstanding stability, without deactivation effects after ten reaction cycles, being readily applicable for continuous water treatment systems.",
keywords = "disinfection, immobilized TiO2, photocatalysis, pilot-plant, solar",
author = "Carlos Sordo and {Van Grieken}, Rafael and Javier Marug{\'a}n and {Fernandez Ibanez}, P",
year = "2010",
month = "4",
day = "17",
doi = "10.2166/wst.2010.876",
language = "English",
volume = "61",
pages = "507",
number = "2",

}

Solar photocatalytic disinfection with immobilised TiO2at pilot-plant scale. / Sordo, Carlos; Van Grieken, Rafael; Marugán, Javier; Fernandez Ibanez, P.

Vol. 61, No. 2, 17.04.2010, p. 507.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Solar photocatalytic disinfection with immobilised TiO2at pilot-plant scale

AU - Sordo, Carlos

AU - Van Grieken, Rafael

AU - Marugán, Javier

AU - Fernandez Ibanez, P

PY - 2010/4/17

Y1 - 2010/4/17

N2 - The photocatalytic disinfection efficiency has been investigated for two immobilized TiO2 catalytic systems (wall reactor and fixed-bed reactor) in a solar pilot plant. Their performances have been compared with the use of a slurry reactor and the solar disinfection without catalyst. The use of photocatalytic TiO2 wall reactors does no show clear benefits over the solar disinfection process in the absence of catalyst. The reason is that the efficiency of the solar disinfection is so high that the presence of titania in the reactor wall reduces the global efficiency due to the competition for the absorption of photons. As expected, the maximum efficiency was shown by the slurry TiO2 reactor, due to the optimum contact between bacteria and catalyst. However,it is noticeable that the use of the fixed-bed reactor leads to inactivation rate quite close to that of the slurry, requiring comparable accumulated solar energy of about 6 kJ L21 to achieve a 6-log decrease in the concentration of viable bacteria and allowing a total disinfection of the water (below the detection limit of 1 CFU mL21). Not only the high titania surface area of this configuration is responsible for the bacteria inactivation but the important contribution of the mechanical stress has to be considered. The main advantage of the fixed-bed TiO2 catalyst is the outstanding stability, without deactivation effects after ten reaction cycles, being readily applicable for continuous water treatment systems.

AB - The photocatalytic disinfection efficiency has been investigated for two immobilized TiO2 catalytic systems (wall reactor and fixed-bed reactor) in a solar pilot plant. Their performances have been compared with the use of a slurry reactor and the solar disinfection without catalyst. The use of photocatalytic TiO2 wall reactors does no show clear benefits over the solar disinfection process in the absence of catalyst. The reason is that the efficiency of the solar disinfection is so high that the presence of titania in the reactor wall reduces the global efficiency due to the competition for the absorption of photons. As expected, the maximum efficiency was shown by the slurry TiO2 reactor, due to the optimum contact between bacteria and catalyst. However,it is noticeable that the use of the fixed-bed reactor leads to inactivation rate quite close to that of the slurry, requiring comparable accumulated solar energy of about 6 kJ L21 to achieve a 6-log decrease in the concentration of viable bacteria and allowing a total disinfection of the water (below the detection limit of 1 CFU mL21). Not only the high titania surface area of this configuration is responsible for the bacteria inactivation but the important contribution of the mechanical stress has to be considered. The main advantage of the fixed-bed TiO2 catalyst is the outstanding stability, without deactivation effects after ten reaction cycles, being readily applicable for continuous water treatment systems.

KW - disinfection

KW - immobilized TiO2

KW - photocatalysis

KW - pilot-plant

KW - solar

U2 - 10.2166/wst.2010.876

DO - 10.2166/wst.2010.876

M3 - Article

VL - 61

SP - 507

IS - 2

ER -