Characterization of co-metabolic biodegradation of methyl tert -butyl ether by a Acinetobacter sp. strain.

Co-metabolic bioremediation is a promising approach for the elimination of methyl tert -butyl ether (MTBE), which is a common pollutant found worldwide in ground water. In this paper, a bacterial strain able to co-metabolically degrade MTBE was isolated and named as Acinetobacter sp. SL3 based on 16S rRNA gene sequencing analysis. Strain SL3 could grow on n -alkanes (C 5 -C 8 ) accompanied with the co-metabolic degradation of MTBE. The number of carbons present in the n -alkane substrate significantly influenced the degradation rate of MTBE and accumulation of tert -butyl alcohol (TBA), with n -octane resulting in a higher MTBE degradation rate ( V max = 36.7 nmol min -1 mg protein -1 , K s = 6.4 mmol L -1 ) and lower TBA accumulation rate. A degradation experiment in a fed-batch reactor revealed that the efficiency of MTBE degradation by Acinetobacter sp. strain SL3 did not show an obvious decrease after nine rounds of MTBE replenishment ranging from 0.1-0.5 mmol L -1 . The results of this paper reveal the preferable properties of Acinetobacter sp. SL3 for the bioremediation of MTBE via co-metabolism and leads towards the development of new MTBE elimination technologies.