Metabolism of BTEX and naphtha compounds to methane in oil sands tailings.
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2007 Apr 1;41(7):2350-6.Metabolism of BTEX and naphtha compounds to methane in oil sands tailings.1, , , .1Department of Biological Sciences, University of Alberta, Edmonton, AB T6G 2E9, Canada.AbstractNaphtha, comprising low molecular weight aliphatics and aromatics (C3-C14), is used as a diluent in processing of bitumen from oil sands. A small fraction (&1%) is lost to tailings waste and incorporated into mature fine tailings (MFT). BTEX (benzene, toluene, ethylbenzene, and xylenes) and whole naphtha were assessed for biodegradation under methanogenic conditions using MFT from an oil sands tailings settling basin. MFT spiked with 0.05-0.1% w/v of BTEX compounds produced up to 2.1 (+/-0.1) mmol of methane during 36 weeks of incubation. Metabolism of 0.5-1.0% w/v naphtha in MFT yielded up to 5.7 (+/-0.2) mmol of methane during 46 weeks of incubation. Gas chromatographic analyses showed that BTEX degraded in the sequence: toluene & o-xylene & m- plus p-xylene & ethylbenzene & benzene. Only 15-23% of whole naphtha, mainly n-alkanes (in the sequence: nonane & octane & heptane) and some BTEX compounds (toluene & o-xylene & m-xylene), was metabolized. Other naphtha constituents, such as iso-paraffins and naphthenes, remained unchanged during this period. These results suggest that the microbial communities in the MFT can readily utilize certain fractions of unrecovered naphtha in oil sands tailings and support methanogenesis in settling basins. Current study findings could influence extraction process, MFT management, and reclamation options.PMID:
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&2015 易贸资讯（上海）有限公司 版权所有&&|&&&&|&&[Effect of naphthalan and therapeutic mud applications on clinical and roentgenological characteristics in patients with protracted pneumonia].
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2009 May-J(3):16-9.[Effect of naphthalan and therapeutic mud applications on clinical and roentgenological characteristics in patients with protracted pneumonia]. [Article in Russian], , .AbstractThe influence of application of naftalan and therapeutic muds on clinical and roentgenological parameters, external respiration function, biochemical and immunological characteristics of the inflammatory process was studied in 82 patients presenting with protracted pneumonia and compared with the outcome of therapy using no physical factors. The application of naftalan and therapeutic muds was shown to reduce activity of inflammatory processes, improve airway patency and the state ofbronchial mucosa. Naftalan produced better therapeutic effect than muds.PMID:
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