The photocatalytic colour removal from water containing two commercial dyes was examined under sunlight. Three types of reactors, continuously stirred batch reactor (CSBR), solar slurry reactor (SSR) and an open-trough reactor (OTR) were used. Titanium oxide (TiO(2)) was used for making slurry as well as for immobilization on polyester fabric (PE). The dyes were reactive orange M2R (RO4) and reactive black B (RB5) which were treated in continuously stirred batch reactor (CSBR). About 99% colour removal and 84% reduction in COD was observed during 3 h of exposure to sunlight, at an initial concentration of 50 mg/L of RO4 and 0.2g TiO(2)/L in suspensions. About 92% colour removal and 65% reduction in COD was observed during 4 h exposure to sunlight at an initial concentration of RB5 of 50 mg/L and 0.2g TiO(2)/L in suspensions. In SSR, about 98% reduction in colour of dye-bath wastewater (DBWW) was observed while COD removal was 8%. In the experiments using immobilized TiO(2) (TiO(2)/PE) and open trough reactor, 99% and 97% colour removal was observed for RO4 and RB5 respectively in 5 h. However, the COD removal was low, 19 and 7.2% respectively with RO4 and RB5. Dye bath wastewater was also treated in OTR; 97% reduction in colour and 8% reduction in COD were achieved in 5 h. Increase in biodegradability of wastewater was also observed after solar photocatalytic treatment.