Photocatalytic (TiO2/UV) degradation of Reactive Orange 84 azo dye effluent (RO 84) and Alizarin Red 8 (ARS) has been examined using TiO2 catalyst either as slurry in aqueous dye solution or supported on Ti sheet or polyester fabric. The supported forms of catalysts have been used for treating larger volume of RO 84 effluent. Spectrophotometric data on photoreacted dye solution!, have suggested that azo group of RO 84 and quinoid moiety in ARS are affected by photocatalytic process at the onset. Complete colour bleaching occurred within 30 min to 2 h depending upon the initial concentration of the dyes, and greater than or equal to 90% chemical oxygen demand (COD) removal efficiency could be attained using suspended TiO2 in 4-6 h of exposure to UV light. The rates of phorodegrallalion of these dyes have shown pseudo-first-order dependence on the concentration of these dyes less than or equal to 100 ppm). The rate of photodegradation of RO 84 with the supported forms of TiO2 catalysts is order of magnitude lower. The photodegradation of ARS dye has exhibited remarkable dependence on pH while that of RO 84 remained unaffected. This work suggests that TiO2/UV technique can be employed for removing colour and COD of dye-house effluents.