Study on the separation and microbial degradation of vitrinite in Xinjiang Heishan low rank coal
The vitrinite in Xinjiang Heishan low rank coal was separated by heavy liquid centrifugation,and the biodegradation experiments of low rank coal were carried out by Aquamicrobium terea.The results of polarizing microscope analysis showed that the optimum separation density of vitrinite was in the range of 1.15～1.20 kg/m3,and the vitrinite in this interval enrichment rate reached 92.50%.The optimum process conditions for the biodegradation of vitrinite by Aquamicrobium terea were obtained,which were the coal slurry concentration of 0.60 g/50 mL medium,the inoculum amount of 8 mL/50 mL medium,the degradation time of 13 d,and the biodegradation rate was 24.35%at this point.The results of FTIR and XRD analyses indicated that after biodegradation,the absorption peaks of aliphatic hydrocarbons and aro-matic hydrocarbons in vitrinite became weaker,the absorption peaks of—COOH and—NO2 disappeared,the spacing of aromatic layers increased,and the number of aromatic layers decreased,indicating that the organic macromolecules in vitrinite had been degraded to small molecules by Aquamicrobium terea.The re-sults of the GC-MS analyses showed that the liquid bioproducts of vitrinite mainly contained small mole-cules of aliphatic hydrocarbons,aromatic hydrocarbons,esters and amines,and having the highest content of aliphatic hydrocarbons.
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