School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, China.
School of Geoscience and Surveying Engineering, China University of Mining &Technology, Beijing, China.
PLoS One. 2023 Jan 26;18(1):e0280890. doi: 10.1371/journal.pone.0280890. eCollection 2023.
Co-fermentation of lignite and biomass has been considered as a new approach in achieving clean energy. Moreover, the study of the characteristics of solid phase in the synergistic degradation process is of great significance in revealing their synergistic relationship. Accordingly, in order to produce biogas, lignite, straw, and the mixture of the two were used as the substrates, the solid phase characteristics of which were analyzed before and after fermentation using modern analytical methods. The results revealed that the mixed fermentation of lignite and straw promoted the production of biomethane. Moreover, the ratios of C/O and C/H were found to be complementary in the co-fermentation process. Furthermore, while the relative content of C-C/C-H bonds was observed to be significantly decreased, the aromatics degree of lignite was weakened. Also, while the degree of branching increased, there found to be an increase in the content of cellulose amorphous zone, which, consequently, led to an increase in the crystallinity index of the wheat straw. Hence, the results provide a theoretical guidance for the efficient utilization of straw and lignite.
褐煤与生物质共发酵被认为是实现清洁能源的一种新方法。此外，研究协同降解过程中固相的特征对于揭示它们的协同关系具有重要意义。因此，为了生产沼气，本文以褐煤、秸秆以及两者的混合物作为发酵底物，采用现代分析方法对发酵前后的固相特征进行了分析。结果表明，褐煤与秸秆的混合发酵促进了生物甲烷的生成。此外，在共发酵过程中发现 C/O 和 C/H 的比例是互补的。进一步地，虽然 C-C/C-H 键的相对含量显著降低，但褐煤的芳烃程度减弱。同时，随着支化程度的增加，纤维素非晶区的含量增加，从而导致小麦秸秆的结晶度指数增加。因此，这些结果为高效利用秸秆和褐煤提供了理论指导。
