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Microbial alteration of organic matter of humic coal during biological desulphurisation

机译：生物脱硫过程中腐殖质煤有机物的微生物变化

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摘要

The biodegrading influence of biological desulphurisation on bituminous coal and its density fractions was investigated using gas chromatography-mass spectrometry for organic matter alteration and atomic absorption for the assessment of changes in several trace element concentrations. Changes in extract group composition were assessed by comparing the contents of aliphatic, aromatic and polar compounds separated by preparative thin layer chromatography. Aliphatic compounds show extensive alteration due to biodegradation, mainly removal of n-alkanes and lighter acyclic isoprenoids from extracts. The sterane distribution was strongly affected while hopane/moretane distributions show minor changes. Aromatic hydrocarbons were less influenced but some changes were found. It can be assumed that the degree of biodegradation of density fractions increases with increasing concentration of mineral matter since density fractions with lower mineral concentration show smaller changes as a result of biodegradation than those with higher content of minerals. Reduction of concentrations of the following trace elements occurred: beryllium, chromium, zinc, gallium, cadmium, cobalt, lithium, manganese, copper, molybdenum, nickel, lead, and vanadium. The content decrease of an element is not influenced by its geochemical properties. An equally important factor seems to be bonding to organic and inorganic coal substances.
机译：利用气相色谱-质谱法研究有机脱硫和原子吸收的生物脱硫对烟煤及其密度分数的生物降解影响，以评估几种微量元素浓度的变化。通过比较制备薄层色谱法分离的脂肪族，芳香族和极性化合物的含量，评估提取物组组成的变化。脂肪族化合物由于生物降解而显示出广泛的变化，主要是从提取物中除去正构烷烃和较轻的无环类异戊二烯。甾烷分布受强烈影响，而hop烷/更高的烷烃分布显示较小变化。芳烃的影响较小，但发现了一些变化。可以假设密度分数的生物降解程度随矿物质浓度的增加而增加，这是因为具有较低矿物质浓度的密度分数由于生物降解而比具有较高矿物质含量的密度分数具有较小的变化。下列痕量元素的浓度降低了：铍，铬，锌，镓，镉，钴，锂，锰，铜，钼，镍，铅和钒。元素的含量减少不受其地球化学性质的影响。同样重要的因素似乎是与有机和无机煤物质结合。

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