ABSTRACT
The relative mixing ratios of n-hexane to benzene in the feed was studied using four parallel TBABs. The ratios of benzene: n-hexane studied based on volume are: 3:1, 2:1, 1:1 and 1:2. TBABs were operated at pH 4 to provide favorable conditions for fungi growth, while the other operating conditions were kept at the optimal performance as determined by earlier research in our laboratory including nutrient feed rate (2 L/day), air flowrate (1.4 L/min), bed depth (60 cm), EBRT (120 seconds), bed material (diatomaceous earth pellets) and room-temperature (20°C).
