Degradation of lubricating oils by marine bacteria observed by quantitative mass spectrometry |
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Authors: | Yasushi Kawakami Hajime Nishimura |
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Institution: | (1) Department of Chemical Engineering, Faculty of Engineering, University of Tokyo, Hongo 7-3-1, 113 Tokyo, Japan |
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Abstract: | Bacterial degradation of the hydrocarbons of lubricating oils was investigated by mass spectrometric analysis which gives
both total amount and the composition of hydrocarbon types of residual oil. An unused lubricating oil, which mainly consisted
of hydrocarbon types with only a small percentage ofn-alkanes, was degraded by marineBacillus sp. andPseudomonas sp. with 55 % and 25 % decreases in 10 days, respectively. Susceptibility of respective hydrocarbon types to biodegradation
was in the following order: alkanes > non-condensed cycloalkanes, mono-aromatics > condensed cycloalkanes. A used lubricating
oil of different brand showed a larger decrease than the unused oil. Both species of bacteria degraded large portions of alkane
fraction of Arabian light crude oil. |
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Keywords: | |
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