共降解增产煤层气的秸秆关键组分研究

Study on Key Components of Straw in Co-degradation with Coal to Enhance Coalbed Methane

建立秸秆萃取组分与煤共降解增产生物甲烷的实验体系,分析秸秆萃取组分在共降解增产甲烷作用,探究煤与秸秆共降解增产煤层气机理。结果表明,不同试剂萃取秸秆所得萃余固体与煤共降解表现出显著增产生物甲烷效果,甲烷产量随萃取时间的延长先增加后减少,最大为455.64μmol,比单独煤降解和单独秸秆降解生物甲烷产量之和高252.90%。红外光谱结果显示,萃取会改变秸秆结构,尤其是破坏木质素,释放纤维素,提高秸秆的生物有效性。结论认为,秸秆中纤维素是共降解的关键组分,同时秸秆中也存在不利于甲烷生成的组分,进一步增产甲烷需排除秸秆不利组分影响,提高纤维素等有利组分作用。研究结果为明晰煤与秸秆共降解机理奠定基础,为生物质的综合利用和煤层气的高效开发提供思路。

The co-degradations of coal and extraction components of straw including extracts were performed to analyze the role of extraction components of straw in co-degradation and explore the mechanism of co-degradation.The results showed the remarkable enhancement of methane production was observed in the co-degradations of coal with residual straw by different reagents.The methane production increased first and then decreased with the extension of extraction time,with the maximum of 455.64μmol,which was 252.90%higher than the sum of biomethane production of coal degradation and straw degradation.The results of infrared spectroscopy showed that extraction could change the structure of straw,especially destroy lignin,release cellulose,and improve the bioavailability of straw.It is concluded that cellulose in straw is the key component of co-degradation,and there are also components in straw that are not conducive to methane generation.Further increasing methane production can improve the role of favorable components such as cellulose by excluding the influence of unfavorable components in straw.This study further clarifies the mechanism of co-degradation of coal and straw,and provides an important idea for the comprehensive utilization of biomass and the efficient development of coalbed methane.