Two steps of enhancement of phenol detoxification by Bacillus laterosporus BT-271 by means of increasing of the rate of aeration and adding in an apropriate moment a carrier (penopolystyrol pellets, covered with active carbon) were studied. The effectiveness of phenol biodegradation was enhanced with 42 %. Comparative study of the oxygenase activities of the freely suspended cells at the two steps of speeding up of the phenol elimination to elucidate the mechanisms of the processes was carried out.