Experimental study on the production of H2-CH4 from lignite jointly with acid-alkali pretreatment-microbial gasification
(2.Henan Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo, China 454000)
(3.State and Local Joint Engineering Laboratory for Gas Drainage & Ground Control of Deep Mines, Henan Polytechnic University, Jiaozuo, China 454000)
【Abstract】In order to investigate the characteristics of the production of biogas from lignite with acid-alkali pretreatment, the authors carried out the fermentation experiments of hydrogen and methane production by using cultured bacteria from coal seam water in Guhanshan coal mine, as well as acid and alkali pretreatment of lignite in Yining Mine, Xinjiang. The authors measured the gas production, gas components, activity of hydrogenase, COD concentration, and tested XRD and FTIR for coals after gas production. The results show that ① the hydrogen production of coal with alkali pretreatment is the highest with the total gas production of 20.25 mL/g, that of coal with acid pretreatment is 17.05 mL/g, and the lowest hydrogen production is found in raw coal as 14.4 mL/g; ② the determination of HPE is basically corresponding to it, and the hydrogenase activity of hydrogen production from coal with alkali pretreatment is 4.35 mL/(mg·min); ③ the methane production of coal from acid pretreatment is the best, and the total gas production is 23.35 mL/g, while the effects of raw coal and the coal with alkali pretreatment are similar; ④ the concentration of COD in the combined production shows a decrease; ⑤ the organic matter degradation rate of the pretreated coal sample is higher, and the macromolecular structure is more easily degraded. The results show the fermentative biogas characteristics of pretreated coal, and it proves that the combined production of H2-CH4 is beneficial to the utilization of coal, which obviously improves the energy conversion rate.
【Keywords】 pretreatment; fermentation combined production; biogas; formation features;
(Translated by LI XY)
 AMINU B Muhammad, GEOFFREYe D Abbott. The thermal evolution of asphaltene-bound biomarkers from coals of different rank: A potential information resource during coal biodegradation [J]. International Journal of Coal Geology, 2013, 103: 90–95.
 CHEN Run, GENG Qingsheng, SU Xianbo. The formation and accumulation of water soluble gas [J]. Journal of Henan Polytechnic University, 2006, 25 (3): 205–208 (in Chinese).
 LI Chao, LI Xingang, SUI Hong. Evaluation and optimization of key operational parameters for anaerobic fermentation biohydrogen production Dark [J]. Chemical Industry and Engineering, 2014, 31 (1): 57–62 (in Chinese).
 ZHANG Qingye, LI Haoxue. Research on influencing factors of hydrogen yield of biomass gasification [J]. Hubei Agricultural Sciences, 2012, 51 (23): 5442–5444 (in Chinese).
 ZHOU Yi. Influencing factors of hydrogen production by anaerobic fementation from waste activated sludg [D]. Changsha: Hunan University, 2008 (in Chinese).
 XIA Daping, SI Qing, MA Junqiang, et al. Experimental study on hydrogen production conditions of coal fermentation and orthogonal optimization [J]. Coal Conversion, 2014, 37 (3): 72–76 (in Chinese).
 XIAO Benyi, WEI Yuansong, LIU Junxin. Factors of affecting microbial fementative hydrogen production [J]. Microbiology China, 2004, 31 (3): 130–135 (in Chinese).
 WANG Aikuan, QIN Yong, SHAO Pei. Chemical factors influencing lignite biogenic gas production in laboratory condition [J]. Journal of China Coal Society, 2016, 41 (4): 948–953 (in Chinese).
 HU Jue, ZHANG Wudi, LIU Shiqing, et al. Experimental study on capsicum annuum anaerobic fermentation for hydrogen and methane production [J]. Renewable Energy Resources, 2007, 25 (2): 47–48 (in Chinese).
 YIN Fang, HU Jue, ZHANG Wudi, et al. The study on co-fermentation of hydrogen and methane production by Eupatorium adenophorum spreng [J]. Chinese Science Bulletin, 2010 (36): 3469–3476 (in Chinese).
 LI Dong, YUAN Zhenhong, SUN Yongming, et al. Hydrogen and methane production from domestic organic waste by anaerobic fermentative [J]. Transactions of the Chinese Society of Agricultural Engineering, 2009, 25 (S1): 59–63 (in Chinese).
 DAI Yang. Bio-hydrogen and methane production from a higher concentration of maize straw by combining dark fermentation and anaerobic digestion [D]. Zhengzhou: Zhengzhou University, 2014 (in Chinese).
 SUN Yanbin. Effect of different pretreatments on on fermentative hydrogen and methane production from food waste and mechanism investigation [D]. Beijing: Beijing University of Chemical Technology, 2013 (in Chinese).
 JIA Xuan, REN Lianhai, LI Mingxiao, et al. Effects of enzymatic pretreatment on microbial community succession in hydrogen and methane coproduction from reed straw [J]. Research of Environmental Sciences, 2016, 29 (1): 138–145 (in Chinese).
 ZHAO Yuzhong, SHI Xiaoshuang, DAI Meng, et al. Effect of microaeration on the co-production of hydrogen and methane from domestic organic waste [J]. Renewable Energy Resources, 2016, 34 (4): 621–627 (in Chinese).
 SU Xianbo, CHEN Xin, XIA Daping, et al. An experimental study of hydrogen and methane production from fermentation of coal [J]. Natural Gas Industry, 2014, 34 (5): 179–185 (in Chinese).
 XIA Daping, SU Xianbo, WU Yu, et al. Effect of experiment of different pretreatment methods and simulating biogenic methane production on coal structure [J]. Journal of China Coal Society, 2013, 38 (1): 129–133 (in Chinese).
 JIA Xuemei, ZHOU Anning, LIU Bo, et al. Different chemical pre-treatment affected to pore structure features of shenfu fine coal [J]. Coal Science and Technology, 2013, 41 (3): 120–124 (in Chinese).
 PENG Jing, GUO Zechong, HOU Lingling, et al. Improvement of acidification performance of waste activated sludge by thermal alkaline pretreatment [J]. Journal of Harbin Institute of Technology, 2012, 44 (8): 43–47 (in Chinese).
 YUAN Guanghuan, ZHOU Xingqiu, WU Jiandong. Enhancement of anaerobic digestion of excess sludge by acid-alkali pretreatment [J]. Environmental Science, 2012, 33 (6): 1918–1922 (in Chinese).