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Position: Home > Articles > Laboratory Study on Adsorption Capacity of Greenhouse Gas in Biochar Cover Hubei Agricultural Sciences 2018 (20) 35-39

生物炭吸附填埋场温室气体试验

关键词：
粉土;生物炭;甲烷;二氧化碳;批量试验;动力学
摘  要：
为了解决老旧填埋场中填埋气无组织释放带来的环境问题,提出的以生物炭为介质的生物覆盖层,除了能提高CH_4氧化能力之外,还可以吸附土壤中以CH_4和CO_2为主的温室气体。通过批量吸附试验发现,添加生物炭能提高土壤CH_4和CO_2吸附能力,对比原土生物炭掺量为20%的改性土其最大气体吸附量更是提高了一个量级;生物炭改性土的CH_4和CO_2气体吸附均符合准二级吸附动力学模型,说明这一吸附过程是由表面吸附和颗粒内扩散联合控制;通过Langmuir等温吸附模型对CH_4和CO_2在改性土中吸附平衡数据非线性拟合,结果理想,1 kg 20%炭改性土最大能吸附0.012 mol CH4和0.043 mol CO_2。
译  名：
Laboratory Study on Adsorption Capacity of Greenhouse Gas in Biochar Cover
作  者：
JIANG Chao;ZHAO Zhong-hui;LIU Bing-yue;Key Laboratory of Ministry of Education for Geotechnical Engineering and Dam Engineering,Hohai University;Jiangsu Research Center for Geotechnical Engineering Technology;Jiujiang Vocational and Technical College;
关键词：
silt;;biochar;;methane;;carbon dioxide;;batch test;;kinetics
摘  要：
To solve the environmental problems caused by the unorganized release of landfill gas from old landfills,a biological blanket using biochar as a medium was proposed. In addition to be able to improve the oxidation capacity of CH_4,it could also absorb greenhouse gas which were dominated by CH_4 and CO_2. By conducting a batch of adsorption experiments,it was found that the biochar could increase the adsorption capacity of soil CH_4 and CO_2,and the maximal value of gas adsorption of the modified soil with 20% biological carbon was increased by one order of magnitude; The adsorptions of CH_4 and CO_2 in the biochar modified soil were conformed to the pseudo-second-order equation,indicating that the adsorption process applied union control through surface adsorption and intra-particle diffusion. The equilibrium adsorption data of CH_4 and CO_2 in the modified soil was analyzed with the Langmuir isothermal adsorption model. The result of nonlinear fitting was ideal. The 1 kg modified soil with 20% biological carbon could adsorb 0.012 mol CH_4 and 0.043 mol CO_2 at maximum.

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