This study was performed to investigate the adsorption characteristics of tannic acid and bisphenol-A(BPA) on Bacillus sludge, which is utilized as a predominant species in Rotating Activated Bacillus Contactor (RABC) process for the treatment of wastewater. The Bacillus sludge showed significantly high adsorption capacity of tannic acid and BPA, compared with activated sludge in a general sewage treatment plant. The Bacillus sludge exhibited the adsorption capacity of 60.0% and 97.7% for tannic acid and BPA, respectively while the activated sludge did 10.1% and 93.9%. The higher adsorption capacity of Bacillus sludge than activated sludge might be attributed to the Extracellular Polymer Substance (EPS), which is secreted by Bacillus sp.. The EPS could enhance the adsorptive characteristics of Bacillus sludge because the polymeric characteristics of EPS is more likely to adsorb the recalcitrant organics. Both Langmuir and Freundlich isotherm models properly simulated the adsorption behavior of tannic acid and BPA on Bacillus sludge. The highly adsorptive characteristics of Bacillus sludge are expected to be widely applied to the treatment of municipal wastewater or industrial wastewater containing recalcitrant organics.