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Abstract
The color and chemical oxygen demand arising from Acid Blue I, Rhodamine B and textile industry wastewater containing vinyl sulphone-based reactive dye are treated using TiO,/ UV technique. Color is found to be removed substantially during first one hour of irradiation of Acid Blue I and Rhodamine B systems. The rate of color removal from textile dyeing industry wastewater in an order of magnitude lower than that of Acid Blue I and Rhodamine B. Simultaneously, the overall COO removal efficiencies under aerated condition are found to be 60% for Acid Blue I/ TiO in 2 hours, 90 % for Rhodamine B/TiO, in 4-5 hours and 45 % for wastewater/ TiO, in 3' hours. The supplied air is found to enhance rate of color and COD removals. The results suggested that some stable intermediates are formed during phoooxidation of these dyes and the photocatalytic degradation of reactive dye containing wastewater is relatively slower.
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References
- APHA-AWWA-WPCF 1989. Standard Methods for the Examination of Water and Wastewater 17" edition. American Ppublic Health Association, Washington, D.C.
- Dhodapakar, R. S., Rao, N. N.. Pande, S. P., and Kaul, S. N. 1999. Photocatalytic destruction of organic pollutants in water.In: Advances in Wastewater Treatment. Tech. Sci. Publications. pp 451.
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- Rao, N. N. and Dubey, S. 1998. Photocatalytic degradation of reactive Orange 84 in dye house effluent using single pass reactor. Studies in surf. Sci. and Catalysis. 113, 1045-1050.
- Schwitzgebel, J, Ekerdt, J. G., Gerischer, H. and Heller, A. 1995. Role of the oxygen molecule and of the photogenerated electron in TiO, photocatalysed air oxidation reactions. J. Phys. Chem, 99, 5633-5638.
- Tinuchi, L., Borgarello, E., Minero, C. and Pelizetti, E. 1993. Treatment of industrial wastewater by photocatalytic oxidation on Tio, In: D. F. Ollis and H. AI-Ekabi, (Eds) Photocatalytic Purification and Treatment of Water and Air. Elsevier Amsterdm pp. 585-594.
- Zhao, J., Taixing Wu, Kaiqun Wu, Oikawa, K., Hidaka, H. and Serpone, N. 1998. Photoassisted degradation of dye pollutants 3 degradation of the cation dye Rhodamine B in aqueous anionic surfactants/ Tio, dispersions under visible light irradiation: Evidence for the need of substrate adsorption on Tio, particles. Environ. Sci. Technol. 32, 2394.
References
APHA-AWWA-WPCF 1989. Standard Methods for the Examination of Water and Wastewater 17" edition. American Ppublic Health Association, Washington, D.C.
Dhodapakar, R. S., Rao, N. N.. Pande, S. P., and Kaul, S. N. 1999. Photocatalytic destruction of organic pollutants in water.In: Advances in Wastewater Treatment. Tech. Sci. Publications. pp 451.
lbusuki Kutsuna, S. Takeuchi, K., Shin Kali K., Sasamoto, T. and Miyamoto, M. 1993. Removal of low concentration air pollutants through photoassisted heterogeneous catalysis. In: D. F. Ollis and H. AI-Ekabi (eds) Photocatalytic Purification and Treatment of Water and Air., Elsvier, Amsterdam, pp. 375-386.
Kesselman, J.M., Shreve, G. A., Hoffman, M. R. and Lewis, N. S. 1994. Flux matching conditions at Tio, photoelectrodes : Is interfacial electron transfer to O, rate limiting in Tio, - Catalyzed photochemical degradation of organics. J. Phys. Chem., 98, 13385-13395.
Matthews, R. W. 1991. Photooxidative degradation of colored organics in water using supported catalysts. TiO, on sand. Water Res. 25, 1169-1177.
Ollis, D. F. I 985. Contaminant degradation in water -- Heterogenous photocatalysis degrades halogenated hydrocarbon contaminants. Environ. Sci. Technol, 19, 480.
Rao, N. N. and Dubey. $. 1997. TiO, catalyzed photodegradation_ofreactive Orange 84 and Alizarin red S biological stain. Ind J. Chem. Technol. 4, 1-6.
Rao, N. N. and Dubey, S. 1998. Photocatalytic degradation of reactive Orange 84 in dye house effluent using single pass reactor. Studies in surf. Sci. and Catalysis. 113, 1045-1050.
Schwitzgebel, J, Ekerdt, J. G., Gerischer, H. and Heller, A. 1995. Role of the oxygen molecule and of the photogenerated electron in TiO, photocatalysed air oxidation reactions. J. Phys. Chem, 99, 5633-5638.
Tinuchi, L., Borgarello, E., Minero, C. and Pelizetti, E. 1993. Treatment of industrial wastewater by photocatalytic oxidation on Tio, In: D. F. Ollis and H. AI-Ekabi, (Eds) Photocatalytic Purification and Treatment of Water and Air. Elsevier Amsterdm pp. 585-594.
Zhao, J., Taixing Wu, Kaiqun Wu, Oikawa, K., Hidaka, H. and Serpone, N. 1998. Photoassisted degradation of dye pollutants 3 degradation of the cation dye Rhodamine B in aqueous anionic surfactants/ Tio, dispersions under visible light irradiation: Evidence for the need of substrate adsorption on Tio, particles. Environ. Sci. Technol. 32, 2394.