硫酸盐还原菌Desulfotomaculum reducens ZTS1厌氧降解昭通褐煤

Anaerobic degradation of Zhaotong lignite by sulfate reducing bacterium Desulfotomaculum reducens ZTS1

摘要:

[目的] 以云南昭通褐煤为研究对象，从矿井水富集产物中分离得到SRB菌株Desulfotomaculum reducens ZTS1厌氧降解褐煤，分析研究SRB菌株处理褐煤前后的物化性质变化。[方法] 采用工业和元素分析、XRD、FT-IR、SEM和低温液氮吸附法比较研究SRB厌氧降解褐煤前后矿物组成、有机官能团、表面形貌和孔隙结构变化。[结果] D.reducens ZTS1厌氧降解褐煤后灰分和挥发分略有降低，碳、氮和硫元素的含量降低，氧的含量增加，煤中硫代硫酸钠消失，FT-IR结果表明褐煤长链烃上的甲基和亚甲基团增多，游离羟基减少。煤表面粗糙度增加，小孔径的孔隙增多，孔径比表面积增大。[结论] D.reducens ZTS1可以厌氧降解昭通褐煤，厌氧降解后煤的物化性质发生变化。

关键词:生物煤层气;硫酸盐还原菌;褐煤;厌氧降解;孔隙

Abstract:

[Objective] A SRB strain Desulfotomaculum reducens ZTS1 isolated from enrichment from coal mine water was used to anaerobically degrade Yunnan Zhaotong lignite, and the physicochemical properties of which before and after degradation with SRB strain were analyzed. [Methods] Mineral components, organic functional groups, surface morphology, pore structure changes of lignite minerals before and after anaerobic degradation with SRB were studied by proximate and ultimate analysis, X-ray diffraction, Fourier transform infared spectromotry, Scanning electron microscopy and low temperature liquid nitrogen adsorption method. [Results] After anaerobic degradation by D. reducens ZTS1, the ash and volatiles of lignite decreased slightly, the contents of carbon, nitrogen and sulfur decreased, while the content of oxygen increased. The sodium thiosulfate disappeared in the residual coal. FT-IR results showed that the methyl and methylene groups on the long chain hydrocarbon of lignite increased, while the free hydroxyl group decreased. With the increase of coal surface roughness, the pore size of small pore and the specific surface area of pore size Increases.[Conclusion] D. reducens ZTS1 can anaerobically degrade Zhaotong lignite, and change the physicochemical properties of the coal.

Key words:biogenic coal bed methane;sulfate reducing bacteria;lignite;anaerobic degradation;pores