A Comparison Between Tubular and Batch Reactors in Removal of Methylene blue Dye from Simulated Textile Wastewater Using TiO2‎/UV-C Photocatalytic Process.

Dyes are structurally complex materials which enter the environment due to various textile industry processes like dyeing and cloth completion processes. Methylene blue is one of the cationic dyes which is now used in textile industry. Textile industrial wastewaters are one of the important sources of environmental contaminants. The aim of this research is photo catalytic degradation of methylene blue dye with the TiO2 Nan particle with UV-C irradiation using batch and tubular reactor. In this research, photo catalytic degradation of methylene blue dye was studied using different concentration of TiO2 Nan particles (with lower than 21 nm of size) under UV irradiation in a batch and tubular reactor. The variables were: concentrations of color, titanium dioxide nana-particles and air Bubbling. The results of this research show that removal of methylene blue dye has direct correlation with the time of UV irradiation. All tests were performed in neutral pH (pH:7). The best efficiency results for dye removal and COD in the batch reactor were 100 and 42.2 % respectively. However the best color removal efficiency and COD results in tubular reactor were 93 and 47.8 % for titanium dioxide nana particle concentration of 1.2 gr/l-1 during 60 minutes. Furthermore as color concentrations increased, color removal rate decreased. Finally, it was concluded that model of batch reactor is the best efficiency that may be selected with regard to the characteristic of textile wastewater, desired treatment efficiency and the discharge standards.