<![CDATA[The textile industry is one of the industries that produces liquid waste in the form of dyes such as blue Bordeaux which can be treated biologically, physically or chemically. Biological waste treatment has the advantage since it is safe, environmentally friendly, does not require large costs, and does not cause additional waste pollution. Biological waste treatment can be carried out using white rot fungi (Omphalina sp and Pleurotus ostreatus) and ligninolytic-methylene-blue degrading bacteria as the decolorizing agents in doses of 15, 30, 45% (w/w). The decolorization test was carried out using two methods, namely the Rotary Biological Contactor (RBC) and Batch Biological Contactor (BBC). This study aimed to determine the optimum concentration of biological agent and to compare the best method among the two in terms of blue Bordeaux decolorization. A factorial Completely Randomized Design (CRD) was used and the data was analyzed using ANOVA (analysis of variance) with a 95% confidence level followed by Tukey’s Honest Significance Difference Test. The results showed that not only the type of agent but also decolorization method had a significant effect on the level of decolorization of the blue Bordeaux textile colour. The highest percentage reduction of blue Bordeaux was found in Omphalina sp. as biosorbent with a concentration of 30% using the RBC method for 24 hours. Keywords: dye decolorization, ligninolytic microorganism, Omphalina sp., Pleurotus ostreatus]]>
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