kh Badii - Department of Environmental Researches, Institute for Colorants, Paints and Coatings, Tehran, Iran.
S. Shaker - Department of Chemistry, Shahid Rajaie University, Tehran, Iran.

Direct light is a method to treat the waste water, especially in colored systems. This method is very simple and cheep, but it needs a big area and long time. In this paper, the kinetics of degradation process under direct light has been investigated for acid blue 92 (AB92) dye. A sealed system has been adjusted with 5 different initial concentrations and the change of concentration has been investigated with time. Two normal white fluorescent lamps have been used as sources of light. The experiments showed that the degree of kinetics equation would change with the initial concentration of dye. It would increase by increasing the initial concentration of pollutant. It means that there would be different step in degradation process of dye by direct light and the kinetics equation should be complex.

Dye degradation process, Acid blue 92, wastewater treatment, direct light, Kinetics equation