Effects of Reactor and Reaction Condition on Bioremoval of Xenobiotics Bisphenol A in Soil Slurry by White-Rot Basidiomycete

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In this report, bisphenol A (BPA) was selected as a model xenobiotic compound in soil slurry, and the bioremoval of BPA by white rot fungi in shaking flask, roller bottle reactor and bubble column reactor were studied. The initial weight ratio of liquid and soil over some level is found to be necessary to form soil slurry. The threshold of the ratio for soil slurry forming seems to be the maximum moisture content of soil. In shaking flask, the removal ratio of BPA was 0.97 (n=2) in 24 h. The period for achieving this ratio was shortened about 30 times in comparison to our previous experiment in solid state. In case that the soil slurry was observed in shaking flask, the removal ratios of BPA at 24 h were constant (0.98±0.01) and independent to shaking speeds (60, 100 rpm). The roller bottle reactor could achieve effective bioremoval reaction in lower rotation speed comparing with shaking flask, and the removal ratio reached almost 1 at 12 h. In bubble column reactor, the differences in BPA removal rates were observed among bubble columns with different shape. The shape of reactor seems to affect the mixing state of soil slurry rather than oxygen supply.