以玉米秸秆为原料,在能将外源H2连续导入沼气发酵系统的装置中进行厌氧发酵,探索在发酵初始阶段连续通入不同量的外源H2,并在发酵稳定阶段接着通入适量的外源H2对厌氧发酵的影响。研究发现,相对于仅在发酵稳定期通适量外源H2,在发酵初始阶段通入适量外源H2可以提高沼气产量,且提纯效果更优,还可以促进挥发性脂肪酸(volatile fatty acids, VFAs)降解,最终沼液的pH略有上升。其中在发酵初始阶段通入3倍H2量,并在发酵稳定期接着通入5倍H2量时,沼气总产量和CH4总产量较高,高出对照组约21.1%、47.1%,提纯效果也较好,其平均CH4相对含量比对照组提高约32.1%,同时VFAs低于对照组最明显。该研究结果对于沼气原位纯化从而提高沼气利用效率具有重要指导意义。
Effect of continuous introduction of exogenous H2 on anaerobic fermentation was studied. Corn straw as raw material was used to conduct anaerobic fermentation in a device capable of continuously introducing exogenous hydrogen. The result found that supplying with appropriate amount of H2 in the initial stage of fermentation enhanced biogas production, and purification efficiency was better than supplying with only exogenous H2 during the stable fermentation period. It also promoted degradation of volatile fatty acids (VFAs) and slightly increased the pH of the biogas slurry. When the amount of H2 introduced during the initial stage increased by three times, and during the stabilization stage increased by five times, the total biogas production and total CH4 yield increased 21.1% and 47.1% than the control group, and the purification efficiency improved as well. The average relative content of CH4 was 83.5%, which was 32.1% higher than that of the control group, and VFAs was noticeably lower than the control group. The results provide critical guidance for in situ purification of biogas to improve biogas utilization efficiency.
[1] 楼毕觉,邓小宁,程玉娥,等.基于不同底物的微氧沼气发酵原位脱硫及其影响研究[J].食品与发酵工业,2019,45(8):57-62.
[2] 吴楠,孔垂雪,刘景涛,等.农作物秸秆产沼气技术研究进展[J].中国沼气,2012,30(4):14-20.
[3] 李步青,代学猛,代永志,等.农作物秸秆厌氧发酵制沼气工程设计研究[J].安徽农业科学,2015,43(9):268-270.
[4] 宋籽霖.秸秆沼气厌氧发酵的预处理工艺优化及经济实用性分析[D].杨凌:西北农林科技大学,2013.
[5] 赵丽霞.浅谈沼气发酵技术[J].内蒙古石油化工,2008,34(10):50-51.
[6] GAUR A,PARK J W,JANG J H,et al.Precipitation of barium carbonate from alkanolamine solution-study of CO2 absorption from landfill gas(LFG)[J].Journal of Chemical Technology & Biotechnology,2015,86(1):153-156.
[7] LÃNTELÃ J,RASI S,LEHTINEN J,et al.Landfill gas upgrading with pilot-scale water scrubber: Performance assessment with absorption water recycling[J].Applied Energy,2012,92(4):307-314.
[8] HARASIMOWICZ M,ORLUK P,ZAKRZEWSKATRZNA-DEL G,et al.Application of polyimide membranes for biogas purification and enrichment[J].Journal of Hazardous Materials,2007,144(3):698-702.
[9] OSORIO F,TORRES J C.Biogas purification from anaerobic digestion in a waste-water treatment plant for biofuel production[J].Renewable Energy,2009,34(10):2 164-2 171.
[10] LINDEBOOM R E F,WEIJMA J,VAN LIER J B.High-calorific biogas production by selective CO2 retention at autogenerated biogas pressures up to 20 bar[J].Environmental Science & Technology,2012,46(3):1 895-1 902.
[11] ANDRIANI D,WRESTA A,ATMAJA T D,et al.A review on optimization production and upgrading biogas through CO2 removal using various techniques[J].Applied Biochemistry & Biotechnology,2014,172(4):1 909-1 928.
[12] 涂睿,黎军,王萌,等.利用外源氢气纯化升级沼气的研究进展[J].化工学报,2014,65(5):1 587-1 593.
[13] 汪昱昌,江皓,郝文川,等.通过外源氢气固定二氧化碳提纯沼气技术的研究进展[J].绿色科技,2017(6):149-152.
[14] AKANSU S O,DULGER Z,KAHRAMAN N,et al.Internal combustion engines fueled by natural gas-hydrogen mixtures[J].Internaional Joutnal of Hydrogen Energy,2004,29(14):1 527-1 539.
[15] HAO X D,LIU R B, VAN LOOSDRECHT M C M,et al.Batch influences of exogenous hydrogen on both acidogenesis and methanogenesis of excess sludge[J].Chemical Engineering Journal,2017,317:544-550.
[16] MULAT D G,MOSB∞K F,WARD A J,et al.Exogenous addition of H2 for an in situ biogas upgrading through biological reduction of carbon dioxide into methane[J].Waste Management,2017,68:146-156.
[17] 林春绵,叶媛媛,邓小宁,等.外源氢气连续导入沼气发酵系统原位合成甲烷的实验研究[J].高校化学工程学报,2017,31(4):892-898.
[18] 林春绵,俞游,章祎玛,等.外源氢厌氧发酵原位合成甲烷的实验研究[J].浙江工业大学学报,2015,43(6):595-599.
[19] 李建昌,张无敌.氢分压对种间氢转移的影响[J].云南师范大学学报(自然科学版),2005,25(5):21-25.
[20] 乔玮,任征然,熊林鹏,等.通入外源氢提高秸秆发酵沼气中甲烷浓度的研究[J].高校化学工程学报,2019,33(3):628-635.
[21] APPELS L,BAEYENS J,DEGRE′VE J,et al.Principles and potential of the anaerobic digestion of waste-activated sludge[J].Progress in Energy and Combustion Science,2008,34(6):755-781.
[22] LUO G,JOHANSSON S,BOE K,et al.Simultaneous hydrogen utilization and in situ biogas upgrading in an anaerobic reactor[J].Biotechnology & Bioengineering,2012,109(4):1 088-1 094.
[23] LUO G,ANGELIDAKI I.Co-digestion of manure and whey for in situ biogas upgrading by the addition of H2:process performance and microbial insights[J].Applied Microbiology & Biotechnology,2013,97(3):1 373-1 381.
