Aqueous suspensions of Escherichia coli and TiO2 (anatase) were irradiated with a BLF lamp (320nm<λE. coli level of cells/mL was 1.78×10−2/min for light intensity of 67.9μE/s.m2 in the presence of 1mg/mL TiO2. Optimum TiO2 loading and the effect of light intensity are also reported.