期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 45, 期 13, 页码 5892-5899出版社
AMER CHEMICAL SOC
DOI: 10.1021/es200649t
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资金
- NSERC
Extraction of bitumen from mined oil sands ores produces enormous volumes of tailings that are stored in settling basins (current inventory a. >= 840 million m(3)). Our previous studies revealed that certain hydrocarbons (short-chain n-alkanes [C(6)-C(10)] and monoaromatics [toluene, o-xylene, m-xylene]) in residual naphtha entrained in the tailings are biodegraded to CH(4) by a consortium of microorganisms. Here we show that higher molecular weight n-alkanes (C(14), C(16), and C(18)) are also degraded under methanogenic conditions in oil sands tailings, albeit after a lengthy lag (similar to 180 d) before the onset of methanogenesis. Gas chromatographic analyses showed that the longer-chain n-alkanes each added at similar to 400 mg L(-1) were completely degraded by the resident microorganisms within similar to 440 d at similar to 20 degrees C. 16S rRNA gene sequence analysis of clone libraries implied that the predominant pathway of longer-chain n-alkane metabolism in tailings is through syntrophic oxidation of n-alkanes coupled with CO(2) reduction to CH(4). These studies demonstrating methanogenic biodegradation of longer-chain n-alkanes by microbes native to oil sands tailings may be important for effective management of tailings and greenhouse gas emissions from tailings ponds.
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