counts for more than 1 million tons per year of the world industrial output, and during dying processes, about 40% of this huge amount of azo dyes ends up in drainage. In addition, about 40 - 65 L of textile effluent is generated per kg of cloth produced. On the other hand the release of these compounds into the environment presents seri- ous health problems related to both aesthetic pollution and their toxicity [17]. Colored-dye-wastewater treat- ment and decolorization presents an arduous task. Wide ranges of pH, salt concentrations and chemical structures often add to the complication. There are many reports on the use of physicochemical methods for color removal from dyes containing effluents [18]. Extensively used co- agulation/flocculation techniques produce large amounts of sludge, which requires safe disposal. Partial absorption and membrane filtration techniques lead to secondary waste streams which need further treatment. These con- straints have led to the adoption of advanced oxidation processes (AOP) and biological methods as attractive options for the treatment of dye-containing wastewaters. AOP is defined as those processes that use strong oxi- dizing agents (H2O2, Fenton’s reagent) or heterogenous photocatalysts, such as TiO2, ZnO2, Mn, or Fe in the presence or absence of an irradiation source. These in- volve mainly the generation of (OH) radicals for the de- struction of refractory and hazardous pollutants [19]. These methods do not produce solid waste. However, both AOP and the membrane filtration methods are en- ergy and cost intensive. Among the most economically viable choices available for effluent treatment/decolori- zation, and also the most practical in terms of manpower requirements and running expenses to adopt and develop, appear to be effect utilization of biological treatments. Fungal, bacterial and yeast decolorization are a promis- ing alternative to replace or supplement present treatment processes. The main objective of the present work is an investigation of the isolation, purification, and screening of bacterial isolations to test whether they have the abi- lity to decolorize and mineralize models of azo dyes, and optimize this ability for application in textile wastewater