ABSTRACT

In the present investigation, an attempt has been made to beneficiate lignite using Burkholderia sp. GR 8–02, Bacillus sp. XQW, and mixed consortium. The experiments showed that Bacillus sp. XQW could remove 18.18–37.50% of total sulfur followed by mixed consortium (18.18–29.17%) and Burkholdria sp. GR 8–02 (9.09%-29.17%). There was also a concomitant decrease in the content of mineral matter as revealed in decrease of ash yields from 10.02 to 29.12% by Bacillus sp. XQW followed by 11.74–29.10% by Burkholderia sp. GR8-02 and 9.93–29.30% by mixed consortium. During the biotreatment of lignite, a reduction in the volatile matter and oxygen was also observed. Study through Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy–energy dispersive spectroscopy (SEM-EDS), petrography, and chemistry of lignite samples provided more insights into the changes in the calorific values as well as the chemical attributes of the lignite after bacterial treatment. The study revealed an increase in the Gross calorific value (6417–7234 cal/g) and Net calorific value (6522–7190 cal/g) of the lignite following the bacterial treatment. Thus, bacterial treatment of the lignite samples proved to be an effective tool for the upgradation of lignite.

摘要

在目前的调查中，已经尝试使用伯克霍尔德氏菌选矿褐煤。GR 8-02，芽孢杆菌。XQW，和混合财团。实验表明，芽孢杆菌。XQW 可以去除总硫的 18.18-37.50%，其次是混合联合体（18.18-29.17%）和伯克霍尔德氏菌。GR 8–02 (9.09%-29.17%)。Bacillus sp.灰分产量从 10.02% 下降到 29.12% 表明，矿物质含量也随之下降。XQW 其次是伯克霍尔德菌11.74–29.10%sp。GR8-02 和 9.93–29.30% 混合财团。在褐煤的生物处理过程中，还观察到挥发性物质和氧气的减少。通过傅里叶变换红外 (FTIR) 光谱、X 射线衍射 (XRD)、扫描电子显微镜-能量色散光谱 (SEM-EDS)、岩相学和褐煤样品的化学研究，也为了解热值的变化提供了更多见解作为细菌处理后褐煤的化学属性。研究表明，细菌处理后褐煤的总热值 (6417–7234 cal/g) 和净热值 (6522–7190 cal/g) 增加。因此，褐煤样品的细菌处理被证明是褐煤升级的有效工具。