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During the last decade the use of titanium dioxide has been the focus of water purification studies for photocatalytic degradation of organic compounds. However, the possible use of this technology for water disinfec­tion has been essentially unexplored. In our study U.V. black light (365 nm) at 5.5 mW cm -2  irradiation intensity was used on different TiO 2  concentrations (g/L) in batch reactor. Using this irradiation intensity the most effective inactivation of E. coli CN 13  was obtained at 1 g/L suspension of TiO 2  (viable numbers reduction of 5 orders of magnitude in 5 min was observed). Under the same experimental conditions, MS2 bacteriophage viable count was reduced by 4 orders of magnitude, also in 5 min. B. fragilis bacteriophages have been well documented to be highly resistant to UV irradiation (245 nm) compared to enteric viruses and other bacteriophages. A B. fragilis bacterio­phage isolated from sewage was also tested for inactivation, and the results showed a drop of 2 orders of magnitude in 5 min. Tested for longer periods of irradiation, E. coli CN 13  was inactivated completely after 60 min (initial concentration 1O 6  CFU/mL), MS2 dropped to 1O 2  PFU/mL after 60 min (initial concentration 1O 9  PFU/mL) and B. fragilis phage dropped to 0 after 60 min (initial concentration 1O 4  PFU/mL). The Deinococcus radiophilus bacterium well known to be highly resistant to ionizing radiation (λ-radiation) was also subjected to TiO 2  photo- catalytic inactivation in water. The observed reduction in viable count of Deinococcus radiophilus under similar conditions applied to E. coli CN 13 , was approximately one order of magnitude. However addition of O 2  into the experimental environment increased the inactivation of Deinococcus radiophilus by four orders of magnitude in 60 min (first 30 min no inactivation was observed, but in the next 30 min the viable count dropped by four logs). The TiO 2  photocalytic inactivation shows promising results for inactivation of microorganisms in drinking water, though further studies are required to optimize this system according to various engineering aspects.

journal of advanced oxidation technologies

Photocatalytic Inactivation of Different Bacteria and Bacteriophages in Drinking Water at Different TiO 2  Concentration With or Without Exposure to O 2