Solar photocatalytic disinfection with immobilised TiO(2) at pilot-plant scale

Water Science and Technology : a Journal of the International Association on Water Pollution Research
Carlos SordoP Fernández-Ibáñez

Abstract

The photocatalytic disinfection efficiency has been investigated for two immobilized TiO(2) 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 TiO(2) 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 TiO(2) 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 L(-1) 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 mL(-1)). Not only the high titania surface area of this configuration is responsible for the bacteria inactivation but the important contrib...Continue Reading

Citations

Dec 20, 2011·Journal of Hazardous Materials·Peter K J RobertsonDetlef W Bahnemann
Apr 2, 2015·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·John Anthony ByrneAshlene Sarah Margaret Vennard
Apr 16, 2020·Applied Catalysis. B, Environmental·Vicente Rodríguez-GonzálezAkira Fujishima

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