摘要
为研究H_(2)O_(2)预处理联合生物降解对煤孔隙的影响,利用浓度为0.05%H_(2)O_(2)对烟煤进行预处理,采用煤层气产出水富集获得的高效菌群进行厌氧降解煤产甲烷实验,通过气相色谱仪检测甲烷含量,通过低温液氮吸附对煤孔隙发育变化进行表征。结果表明:利用H_(2)O_(2)预处理烟煤显著提高了生物甲烷产量;预处理对煤孔隙类型没有显著影响,但残煤的吸附量减少,有利于原位煤层气的抽采;经预处理后,煤样的微孔和中孔孔容增加,而过渡孔孔容降低。经生物降解后,残煤的总孔容和比表面积均显著降低,可能是微生物代谢产生的可溶有机质滞留积累在煤中,从而堵塞了煤孔隙所导致。
To study the effect of H_(2)O_(2) pretreatment combined with biodegradation on coal pores, the bituminous coal was pretreated with 0.05% H_(2)O_(2), and the high-efficiency methanogenic microflora derived from the produced water of active coalbed methane(CBM)wells was used for anaerobic degradation of coal. The content of biomethane was detected by gas chromatograph and the development of coal pores was characterized by low-temperature liquid nitrogen adsorption. The results showed that H_(2)O_(2) pretreatment of bituminous coal could significantly enhance biomethane production. Pretreatment had no significant effect on the type of coal pores, but the adsorption capacity of residual coal was reduced, which was conducive to the extraction of in-situ CBM. After pretreatment, the micro-pores and meso-pores volume of coal sample increased, while the transitional pores volume decreased. After biodegradation, the total pore volume and specific surface area of residual coal were significantly reduced;this may be caused by the retention and accumulation of soluble organic matter produced by microbial metabolism in the coal, thus blocking the pores of the coal.
作者
成雅彤
宁舒苗
郭红光
张攀攀
CHENG Yatong;NING Shumiao;GUO Hongguang;ZHANG Panpan(College of Safety and Emergency Management Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of In-situ Property-improving Mining of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《煤矿安全》
CAS
北大核心
2021年第1期8-12,共5页
Safety in Coal Mines
基金
国家自然科学基金资助项目(U1810103,51404163)
山西省重点研发计划资助项目(201903D421088)。
