| Abstract |
Co-degradation of coal and straw can significantly increase methane production compared to coal and straw degradation alone, but little is known about the effect of co-degradation on the fermentation of refractory fractions. In this paper, lignite and rice straw were degraded multiple times to obtain the refractory fractions which were then co-degraded with rice straw (RSL10) and lignite (LRS10), respectively. The methane production of lignite and rice straw after ten degradations reached 969.38 μmol and 582.47 μmol, respectively, which were 7.83 times and 31.25 times higher than degradation one time, suggesting that they have significantly higher methane production potentials than expected. The methane production of RSL10 and LRS10 only increased by 9.05 μmol and 5.67 μmol, and the structure of refractory fractions barely changed after co-degradation for both lignite and rice straw, revealing that the metabolism of refractory fractions rarely contributed to methane production in co-degradation. FTIR and 13C-NMR analysis verified that the aromatics, methyl carbon, and oxygen containing functional groups in lignite, carbonyl groups and glycosidic linkages in rice straw were utilized to produce methane in multiple degradations. Desulfomicrobium increased to 20.67% in RSL10, while Pseudomonas and Clostridium increased to 18.85% and 9.17% in LRS10, which were mainly induced by the added raw lignite and rice straw. It revealed that co-degradation mainly enhanced the fermentation of degradable components instead of refractory organics in lignite and rice straw. The methane potential of degradable components can be released by co-degradation and multiple degradations. Our results are beneficial for the better understanding of co-degradation mechanism and biomethane generation in the coal seams. |
| Authors |
Yao Shen  , Jiaqi Cheng , Xinbin Feng , Hongguang Guo , Ruyin Liu , Zaixing Huang  , Michael A. Urynowicz
|
| Journal Info |
Elsevier BV | Journal of Environmental Chemical Engineering , vol: 12
, iss: 2
, pages: 112373 - 112373
|
| Publication Date |
4/1/2024 |
| ISSN |
2213-2929 |
Type |
article |
| Open Access |
closed
|
| DOI |
https://doi.org/10.1016/j.jece.2024.112373 |
| Keywords |
Microbial Methane Generation (Score: 0.518697) , Coal Permeability (Score: 0.503447) , Methane Adsorption (Score: 0.500897)
|
