Biogas production and variation of the chemical composition of the high temperature water extract of lignite

Authors

REN Hengxing, The State Key Laboratory of Coal and Coalbed Methane Simultaneous Extraction, Jincheng 048000, China
HE Huan, School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221006, ChinaFollow
LIU Fangjing, Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining and Technology, Xuzhou 221116, China
WANG Meilin, The State Key Laboratory of Coal and Coalbed Methane Simultaneous Extraction, Jincheng 048000, China
GUO Xin, The State Key Laboratory of Coal and Coalbed Methane Simultaneous Extraction, Jincheng 048000, China
CHEN Linyong, The State Key Laboratory of Coal and Coalbed Methane Simultaneous Extraction, Jincheng 048000, China
ZHAO Han, The State Key Laboratory of Coal and Coalbed Methane Simultaneous Extraction, Jincheng 048000, China
YUAN Xuefang, The State Key Laboratory of Coal and Coalbed Methane Simultaneous Extraction, Jincheng 048000, China
GUAN Jiadong, The State Key Laboratory of Coal and Coalbed Methane Simultaneous Extraction, Jincheng 048000, China
YUE Lijiao, The State Key Laboratory of Coal and Coalbed Methane Simultaneous Extraction, Jincheng 048000, China

Abstract

The interaction process between microorganism and coal is complicated. In order to deeply analyze the function and change rule of organic matter in coal in the process of biological gas production, taking Yima lignite and methanogens preserved in laboratory as research objects, the gas production characteristics of water-soluble organic matter of lignite and its chemical composition change before and after gas production were studied. The water-soluble organic components of Yima lignite obtained by deionized water extraction at 70℃ and the extraction residue were used as substrates for biogas production. High performance liquid chromatography-mass spectrometry (HPLC-MS), gas chromatography(GC) and gas chromatography-mass spectrometry(GC-MS) were used to analyze the change of gas production and the chemical composition of fermentation broth and coal methanol extract. The results showed that the gas production of raw coal, water-soluble organic matter and extraction residue were 0.46, 0.45 and 0.15 mmol/g coal respectively. At the beginning of gas production, the chemical composition of water-soluble organic compounds of which the molecular weight was mainly concentrated in 200-300 Da was complex. After biogas production, the species of compounds decreased, and the molecular weight decreased to 150-200 Da. Some oxygen-containing and nitrogen-containing compounds with phenyl rings were detected in the fermentation broth. GC-MS analysis showed that a small number of water-soluble compounds(e.g., formamide, acetamide and dimethyl sulfite) appeared in the methanol extract of extraction residue after biogas production. The conclusion was that the water-soluble organic matter of lignite extracted at 70℃ can be utilized by methanogens for biogasification and some water-insoluble organic compounds were converted into water-soluble organic compounds in the process of biodegradation. This study explored the potential role of water-soluble organic compounds in the biogasification process of lignite.

Keywords

lignite, extraction, water-soluble organic compounds, biogas production, high temperature, Yima of Henan

DOI

10.3969/j.issn.1001-1986.2020.04.019

Recommended Citation

REN Hengxing, HE Huan, LIU Fangjing, et al. (2020) "Biogas production and variation of the chemical composition of the high temperature water extract of lignite," Coal Geology & Exploration: Vol. 48: Iss. 4, Article 20.
DOI: 10.3969/j.issn.1001-1986.2020.04.019
Available at: https://cge.researchcommons.org/journal/vol48/iss4/20

Reference

[1] WANG A K,SHAO P,LAN F J,et al. Organic chemicals in coal available to microbes to produce biogenic coalbed methane:A review of current knowledge[J]. Journal of Natural Gas Science & Engineering,2018,60:40-48.

[2] 夏大平,黄松,张怀文. 铁镍离子组合对褐煤发酵产甲烷的影响[J]. 煤田地质与勘探,2019,47(6):59-66. XIA Daping,HUANG Song,ZHANG Huaiwen. Effects of iron-nickel ion combination on methane produced by lignite fermentation[J]. Coal Geology & Exploration,2019,47(6):59-66.

[3] 乔留虎,夏大平,唐书恒,等. 低煤阶煤产气量的pH和Eh控制[J]. 煤田地质与勘探,2016,44(4):73-76. QIAO Liuhu,XIA Daping,TANG Shuheng,et al. The control of pH and Eh of the gas production of low rank coal[J]. Coal Geology & Exploration,2016,44(4):73-76.

[4] 苏现波,吴昱,夏大平,等. 温度对低煤阶煤生物甲烷生成的影响[J]. 煤田地质与勘探,2012,40(5):24-26. SU Xianbo,WU Yu,XIA Daping,et al. Effect of temperature on biological methane generation of low rank coal[J]. Coal Geology & Exploration,2012,40(5):24-26.

[5] RITTER D, VINSON D,BARNHART E,et al. Enhanced microbial coalbed methane generation:A review of research,commercial activity,and remaining challenges[J]. International Journal of Coal Geology,2015,146:28-41.

[6] FUERTEZ J,CORDOBA G,MCLENNAN J D,et al. Potential application of developed methanogenic microbial consortia for coal biogasification[J]. International Journal of Coal Geology,2018.

[7] LIU F J,GUO H G,WANG Q R,et al. Characterization of organic compounds from hydrogen peroxide-treated subbituminous coal and their composition changes during microbial methanogenesis[J]. Fuel,2019,237:1209-1216.

[8] HE H,HAN Y X,JIN D C,et al. Microbial consortium in a non-production biogas coal mine of eastern China and its methane generation from lignite[J]. Energy Sources,Part A:Recovery,Utilization and Environmental Effects,2016,38(10):1377-1384.

[9] 赵同谦,李鹏,邰超,等. 煤生物成气过程中溶解性有机物的光谱特征研究[J]. 煤炭学报,2017,42(增刊2):525-534. ZHAO Tongqian,LI Peng,TAI Chao,et al. Spectral characteristics of dissolved organic matter in the process of coal gasification by microorganism[J]. Journal of China Coal Society,2017,42(Sup.2):525-534.

[10] 邵培. 中低煤级煤有机地球化学特征及其对生物气生成的影响[D]. 徐州:中国矿业大学,2016. SHAO Pei. Organic geochemical characteristics of low and middle rank coals and their effects on biogas generation[D]. Xuzhou:China University of Mining and Technology,2016.

[11] 陶明信,王万春,李中平,等. 煤层中次生生物气的形成途径与母质综合研究[J]. 科学通报,2014,59(11):970-978. TAO Mingxin,WANG Wanchun,LI Zhongping,et al. Comprehensive study on genetic pathways and parent materials of secondary biogenic gas in coalbeds[J]. China Science Bulletin,2014,59(11):970-978.

[12] 葛晓光,程健明,杨柳,等. Desulfovibrio sp. 厌氧代谢淮南煤中>C12有机组分的实验研究[J]. 地学前缘,2015,22(1):328-334. GE Xiaoguang,CHENG Jianming,YANG Liu,et al. An experimental study of Desulfovibrio sp. anaerobic degradation of>C12 organic compounds of Huainan coal[J]. Earth Science Frontiers,2015,22(1):328-334.

[13] FURMANN A,SCHIMMELMANN A,BRASSELL SC,et al. Chemical compound classes supporting microbial methanogenesis in coal[J]. Chemical Geology,2013,339:226-241.

[14] 彭耀丽,李艳,周肖,等. 褐煤超临界醇解反应与产物组成分析[J]. 煤炭工程,2009(2):88-90. PENG Yaoli,LI Yan,ZHOU Xiao,et al. Supercritical methanolysis reaction of lignite and compositional analysis of product[J]. Coal Engineering,2009(2):88-90.

[15] OREM W H,TATU C A,LERCH H E,et al. Organic compounds in produced waters from coalbed natural gas wells in the Powder River basin,Wyoming,USA[J]. Applied Geochemistry,2007,22(10):2240-2256.

[16] OREM W H,VOYTEK M A,JONES E J,et al. Organic intermediates in the anaerobic biodegradation of coal to methane under laboratory conditions[J]. Organic Geochemistry,2010,41(9):997-1000.

[17] VIETH A,KAI M,SYKES R,et al. Water extraction of coals-potential for estimating low molecular weight organic acids as carbon feedstock for the deep terrestrial biosphere[J]. Organic Geochemistry,2008,39(8):985-991.

[18] MEREL S,SNYDER S. 利用LC/Q-TOF和Mass Profiler Professional软件筛查水中新兴化学污染物[J]. 环境化学,2016,35(3):597-600. MEREL S, SNYDER S. Screening for emerging chemical contaminants in water using LC/Q-TOF and mass profiler professional software[J]. Environmental Chemistry,2016,35(3):597-600.

[19] 姚菁华,肖雷,纪洪敏. 褐煤的分级萃取及生物解聚研究[J]. 中国矿业大学学报,2014,43(1):151-155. YAO Jinghua,XIAO Lei,JI Hongmin. Study of fractional extraction and biodepolymerization of lignite[J]. Journal of China University of Mining & Technology,2014,43(1):151-155.

[20] 王保玉,陈林勇,邰超,等. 外源菌群煤生物气化初步研究:菌群结构、煤种及煤孔(裂)隙[J]. 煤炭学报,2014,39(9):1797-1801. WANG Baoyu,CHEN Linyong,TAI Chao,et al. A preliminary study of biological coal gasification by exogenous bacteria:Microbiome composition,coal type,pore and seam fracture[J]. Journal of China Coal Society,2014,39(9):1797-1801.

[21] STRĄPOĆ D,MASTALERZ M,DAWSON K,et al. Biogeochemistry of microbial coal-bed methane[J]. Annual Review of Earth and Planetary Sciences,2011,39(39):617-656.

[22] 李文军,焦子阳,刘丽丽,等. 甲醇萃取对大雁褐煤孔隙结构的影响[J]. 煤炭转化,2009,32(4):5-7. LI Wenjun,JIAO Ziyang,LIU Lili,et al. Effect of methanol extraction on pore character of Dayan lignite[J]. Coal Conversion,2009,32(4):5-7.