| 褐煤生物产气规律及其液相体系中阳离子变化特征 |
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| 引用本文： | 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.褐煤生物产气规律及其液相体系中阳离子变化特征[J].煤田地质与勘探,2020,48(6):138-145. |
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| 作者姓名： | 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 |
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| 作者单位： | 山西晋城无烟煤矿业集团有限责任公司 煤与煤层气共采国家重点实验室,山西 晋城 048000;易安蓝焰煤与煤层气共采技术有限责任公司,山西 晋城 048000;中国矿业大学 化工学院 煤炭加工与高效洁净利用教育部重点实验室,江苏 徐州 221116 |
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| 基金项目： | 中央高校基本科研业务费专项;山西省基础研究计划;基础研究项目 |
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| 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+、Ca2+、Mg2+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23 μmol/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，Ca2+（26 mg/L）、Mg2+（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Ca2+、Mg2+浓度呈负相关。此外，NH4+和K+以及Ca2+和Mg2+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4+、K+、Ca2+、Mg2+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。
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| 关 键 词： | 生物煤层气 阳离子 离子色谱 褐煤 |
| 收稿时间： | 2020-06-17 |
Biogas production of lignite and variation characteristics of cations in liquid phase system |
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| Abstract: | 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+, Ca2+, Mg2+ 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 Ca2+(26 mg/L), Mg2+(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 Ca2+ and Mg2+. In addition, NH4+ is positively correlated with K+ and Ca2+ is positively correlated with Mg2+. The five cations of K+, Ca2+, Mg2+ 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. |
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