but decolorization percentage did decrease at inoculum size 0.2 ml and 0.5 ml. The decolorization at 0.2 ml inoculum size was better than that at 0.5 ml, although the color removal achieved after 120 hours using 0.5 ml inoculum size had the highest decolorization percentage recorded in this experiment. The decolorization of acid orange 7 by Bur. cepace-TN5 after 24 hours showed that the best decolorization percentage was at inoculum size (2 ml) and the lowest value was for inoculum size 0.2 ml. Results recorded after 12 hours showed that inoculum size 3 ml gave the highest color removal, and other inocula sizes gave nearly the same value of decolorization except for the inoculum size 1 ml, where the lowest value of decolorization percentage was recorded