实验室条件下褐煤生物气生成的化学影响因素

㊀第41卷第4期煤㊀㊀炭㊀㊀学㊀㊀报

Vol.41㊀No.4㊀㊀2016年

4月

JOURNAL OF CHINA COAL SOCIETY

Apr.㊀

2016㊀

王爱宽,秦勇,邵培.实验室条件下褐煤生物气生成的化学影响因素[J].煤炭学报,2016,41(4):948-953.doi:10.13225/ki.jccs.2015.0767

Wang Aikuan,Qin Yong,Shao Pei.Chemical factors influencing lignite biogenic gas production in laboratory condition[J].Journal of Chi-na Coal Society,2016,41(4):948-953.doi:10.13225/ki.jccs.2015.0767

实验室条件下褐煤生物气生成的化学影响因素

王爱宽1,2,秦㊀勇1,2,邵㊀培1,2

(1.中国矿业大学资源与地球科学学院,江苏徐州㊀221116;2.中国矿业大学煤层气资源与成藏过程教育部重点实验室,江苏徐州㊀221116)

摘㊀要:在实验室条件下,分别添加0.2mol /L 乙酸钠㊁0.2mol /L 甲酸和5mg /L 酵母浸出液作为外源碳源,研究煤层本源菌作用下褐煤生物气生成潜力和生成过程中的化学影响因素㊂结果表明,软褐煤和硬褐煤中有机物质都能作为独立碳源生成生物气,软褐煤生成速率(0.18mL /(g ㊃d ))大于硬褐煤(0.13mL /(g ㊃d )),其组分均主要由CH 4和CO 2组成㊂有机碳源的加入对褐煤生物气生成速率和气体组分影响各异㊂0.2mol /L 乙酸钠可以提前甲烷的初始生成时间,同时提高生成速率,显著增加CH 4含量,但总体不会影响煤样本身产生的甲烷量;0.2mol /L 甲酸不仅可以激活产甲烷菌活性,而且可以有效增加褐煤生物气产量和CH 4含量,且成熟度低的软褐煤增加的效果更明显;5mg /L 酵母浸出液对产甲烷菌有抑制作用㊂氯仿沥青A 含量高可能是导致软褐煤生物气产率高的主要原因;DOC 对褐煤生物气生成影响不大㊂研究认为煤基质中底物可利用性和外源有机碳源类型是影响地下煤层中甲烷生成的重要因素㊂关键词:煤层气;生物气;气体组分;化学影响因素

中图分类号:P618．11㊀㊀㊀文献标志码:A㊀㊀㊀文章编号:0253-9993(2016)04-0948-06

收稿日期:2015-05-28㊀㊀修回日期:2015-11-11㊀㊀责任编辑:张晓宁

㊀㊀基金项目:国家自然科学基金面上资助项目(41272177);国家自然科学基金青年基金资助项目(41202119);江苏高校优势学科建设工程资助

项目

㊀㊀作者简介:王爱宽(1981 ),女,江苏徐州人,副教授,博士㊂E -mail:wake198110@

Chemical factors influencing lignite biogenic gas production in

laboratory condition

WANG Ai-kuan 1,2,QIN Yong 1,2,SHAO Pei 1,2

(1.School of Resources and Geoscience ,China University of Mining and Technology ,Xuzhou ㊀221116,China ;2.Key Laboratory of CBM Resources and Pooling Process ,Ministry of Education of China ,Xuzhou ㊀221116,China )

Abstract :Lignite samples were investigated for their ability to support microbial methane production with parent bacte-ria in laboratory incubations,with 0.2mol /L sodium acetate,0.2mol /L formic acid and 5mg /L yeast extract as exog-enous organic carbon sources respectively.Results show that the organic matter in both soft and hard lignite samples could be used as independent carbon sources to produce biogas.Production rate of soft lignite (0.18mL /(g㊃d))is higher than that of hard lignite (0.13mL /(g㊃d)).The simulated biogases are composited by CH 4and CO 2.The in-fluence characteristics of exogenous carbon sources on the biogas production rates and gas compositions are different.Sodium acetate (0.2mol /L)could lead to an earlier generating time of lignite and a increasing production rate,but could not change the production of lignite biogas.Formic acid (0.2mol /L)could not only activate methanogen activi-ties,but also increase the lignite biogas production and CH 4concentration,which effect is more significant for soft lig-nite.Yeast extract (5mg /L)inhibites the activities of methanogen in the incubation.The high concentration of chloro-form bitumen might be the dominate reason for the high production rate of soft lignite.DOC could not affect the biogas