摘要
为研究褐煤生物产气规律及其液相体系中常见阳离子变化特征,以内蒙古胜利褐煤为产气底物,寺河矿区煤层气井排采水中微生物作为发酵菌群,利用5 L厌氧发酵罐进行模拟生物产气实验,采用离子色谱仪对发酵液中的NH4^+、K^+、Ca^2+、Mg^2+和Na^+5种阳离子浓度进行动态监测。结果表明:煤模拟生物产气周期为33 d,分为缓慢增长期、快速增长期和平缓期3个阶段,33 d单位质量煤净产甲烷量最高达23μmol/g;产气体系中NH4^+(741.5 mg/L)和K^+(994.5 mg/L)离子质量浓度变化最为明显,Ca^2+(26 mg/L)、Mg^2+(10.7 mg/L)和Na^+(72 mg/L)次之,表明发酵液中5种阳离子均参与了褐煤生物产气过程,且被不同程度地释放和利用;褐煤生物产气量与阳离子浓度有一定相关性,单位质量煤产气量与NH4^+和K^+浓度呈正相关,与Ca^2+、Mg^2+浓度呈负相关。此外,NH4^+和K^+以及Ca^2+和Mg^2+之间浓度呈显著正相关。由实验结果可知:褐煤生物产气液相体系中NH4^+、K^+、Ca^2+、Mg^2+和Na^+5种阳离子会随着煤中有机组分的厌氧降解而缓慢释放、再吸附,同时可被微生物利用参与细胞内的生物化学反应。
To study the law of lignite biogas production and the variation characteristics of common cations in liquid phase system,Shengli lignite in Inner Mongolia was used as the gas production substrate,and the gas production microorganism in the water from the coalbed methane well in the Sihe mining area as fermentative flora,a 5 L anaerobic fermentation tank was used to simulate the biogas production experiment,and the concentrations of NH4^+,K^+,Ca^2+,Mg^2+ and Na^+ in the fermentation broth were monitored by ion chromatography.The results show that:The simulated biogas production period of Shengli bulk lignite is 33 days;It is divided into three stages:slow phase,rapid rise phase,and steady phase.The net methane production of 33 days is up to 23 μmol/g coal.The concentrations of NH4^+(741.5 mg/L)and K^+(994.5 mg/L) ions is the most obvious in the gas production system,followed by Ca^2+(26 mg/L),Mg^2+(10.7 mg/L),and Na^+(72 mg/L),the results showed that five cations in the fermentation broth were all involved in the biogas production process of lignite,and were released and utilized in varying degrees.There is a certain correlation between the biogas production of lignite and the physicochemical of the fermentation broth.The gas production per unit coal is positively correlated with NH4^+ and K^+,negatively correlated with Ca^2+ and Mg^2+.In addition,NH4^+ is positively correlated with K^+ and Ca^2+ is positively correlated with Mg^2+.The five cations of K^+,Ca^2+,Mg^2+ and Na^+ in lignite biogas liquid phase system will be slowly released and readsorbed with the anaerobic degradation of organic components in lignite,and they can be used by microorganisms to participate in the biochemical reaction in cells.
作者
赵晗
何环
王江泽
宋燕莉
牛江露
陈林勇
郭鑫
刘健
关嘉栋
元雪芳
ZHAO Han;HE Huan;WANG Jiangze;SONG Yanli;NIU Jianglu;CHEN Linyong;GUO Xin;LIU Jian;GUAN Jiadong;YUAN Xuefang(State Key Laboratory of Coal and CBM Co-Mining,Shanxi Jincheng Anthracite Mining Group Co.Ltd.,Jincheng 048000,China;School of Chemical Engineering and Technology^China University of Mining and Technology,Key laboratory of Coal Processing and Efficient Utilization of Ministry ofEducation,Xuzhou 221116,China;Wan Lanyan Coal and Coalbed Methane Simultaneous Extraction Technology Co.Ltd.,Jincheng 048000,China)
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2020年第6期138-145,共8页
Coal Geology & Exploration
基金
中央高校基本科研业务费专项资金资助项目(2017XKQY037)
山西省基础研究项目(2016012009)
山西省应用基础研究项目(201801D221354)。
关键词
生物煤层气
阳离子
离子色谱
褐煤
biogenic coalbed methane
cationic ions
ion chromatography
lignite
