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Aerobic degradation of methyl tert-butyl ether by a Proteobacteria strain in a closed culture system
Authors:ZHONG Wei-hong  CHEN Jian-meng  LU Zheng  CHEN Dong-zhi and CHEN Xiao
Institution:College of Biological and Environmental Engineering,Zhejiang University of Technology,Hangzhou 310032,China
Abstract:The contamination of methyl tert-butyl ether (MTBE) in underground waters has become a widely concerned problem all over the world. In this study, a novel closed culture system with oxygen supplied by H2O2 was introduced for MTBE aerobic biodegradation. After 7 d, almost all MTBE was degraded by a pure culture, a member of β-Proteobacteria named as PM1, in a closed system with oxygen supply, while only 40% MTBE was degraded in one without oxygen supply. Dissolved oxygen (DO) levels of the broth in closed systems respectively with and without H2O2 were about 5-6 and 4 mg/L. Higher DO may improve the activity of monooxygemase, which is the key enzyme of metabolic pathway from MTBE to tert-butyl alcohol and finally to CO2, and may result in the increase of the degrading activity of PM1 cell. The purge and trap GC-MS result of the broth in closed systems showed that tert-butyl alcohol,isopronol and acetone were the main intermediate products.
Keywords:methyl tert-butyl ether  biodegradation  β-Proteobacteria  intermediate products  systems  culture  closed system  strain  ether  methyl  degradation  acetone  intermediate  products  purge and trap  result  increase  cell  key enzyme  pathway  alcohol  improve  activity  levels
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