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Aerobic Degradation of Gasoline Ether Oxygenates

  • Michael HymanEmail author
Reference work entry
Part of the Handbook of Hydrocarbon and Lipid Microbiology book series (HHLM)

Abstract

Ether oxygenates including methyl tertiary butyl ether (MTBE), ethyl tertiary butyl ether (ETBE), tertiary amyl ether (TAME), and diisopropyl ether (DIPE) have been, and continue to be, widely used components of gasoline. The ether bonds and branched hydrocarbon structures of these compounds make these challenging molecules for microbial biodegradation processes. The collective research over the last 20 years suggests that aerobic biodegradation of MTBE and other ether oxygenates by axenic cultures occurs through three physiologically distinct processes that can be differentiated by the fate of the tertiary alcohol intermediates such as tertiary butyl alcohol (TBA) and tertiary amyl alcohol (TAA) that are common to all of these processes. These biodegradation processes represent a continuum and, in order of increasing complexity, include co-oxidation, cometabolism, and growth-supporting metabolism. This review summarizes the main microorganisms, enzymes, and pathways involved in each of these processes and highlights research areas where there is both clear consensus and areas where results are more ambiguous and likely require further investigation. Where relevant, this review also aims to illustrate how basic microbiological research has implications for the remediation of ether oxygenate contamination by aerobic treatment processes.

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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Plant and Microbial BiologyNorth Carolina State UniversityRaleighUSA

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