University of Tehran

Photochemical oxidation of reactive blue 19 dye (RB19) in textile wastewater by uv/K2S2O8 process

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In textile industry the process of dyeing results in the production of large amounts of wastewater exhibiting intense coloration that has to be eliminated before release into natural water streams (Mohorèiè eli at., 2006). Wastewaters from textile industries contain different types of synthetic dyes, which are mostly toxic, mutagenic and carcinogenic. Moreover, they are very stable to light, temperature and microbial attack, making them recalcitrant compounds (Kokol eli at., 2007). Discharging of these wastewaters into receiving streams not only affects the aesthetic aspects but also interferes with transmission of sunlight into streams and therefore reduces photosynthetic activity (çiçek eli at.,2007). Reactive dyes are water-soluble, anionic dyes that require relatively simple dyeing methods. They are mainly used for dyeing cellulosic fibers, such as cotton and rayon, but are also used for silk, wool, nylon, and leather (Yang and Jared McGarrahan, 2005). Reactive dyes are extensively used in textile industry,  findamentally due to the capacity of their reactive groups to bind on textile fibers by covalent bonds formation (Pelegrini eli at., 1999). The major environmental problem associated with the use of the reactive dyes is theft loss in the dyeing process (Pelegrini eli at., 1999).

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