生物炭改性土的甲烷吸附试验研究

发布时间：2018-07-06 11:29

本文选题：粉土 + 生物炭　；参考：《岩土工程学报》2017年S1期

【摘要】：生物覆盖层是一种新型生活垃圾填埋场覆盖层,对比传统的压实黏土覆盖层其具有较高的甲烷氧化能力,减少垃圾填埋场甲烷的释放。生物炭作为生物覆盖介质,除了提高土壤甲烷氧化能力之外,其较大的比表面积还能增加甲烷吸附能力。为更好地理解生物炭对土壤的甲烷吸附特性的影响,通过批量吸附试验研究生物炭改性土在不同甲烷初始浓度与生物炭掺量下的甲烷吸附能力。试验结果表明添加生物炭能提高土壤甲烷吸附能力,相比较原土,炭掺量为20%的改性土最大甲烷吸附量提高了一个量级,甲烷吸附能力得到明显提高主要得益于生物炭的多孔结构。并且生物炭改性土的吸附特性均符合Lagergren准二级吸附动力模型和Langmuir等温吸附模型。
[Abstract]:Biological cover is a new type of landfill cover. Compared with the traditional compacted clay coating, it has higher methane oxidation ability and reduces methane release from landfill. Biochar, as a biofilm medium, not only improves the oxidation ability of soil methane, but also increases the adsorption capacity of methane with larger specific surface area. In order to better understand the effect of biochar on the adsorption characteristics of methane in soil, the adsorption capacity of biochar modified soil under different initial concentrations of methane and different amounts of biochar was studied by batch adsorption experiments. The results show that the addition of biochar can improve the adsorption capacity of methane in soil. Compared with the original soil, the maximum methane adsorption capacity of the modified soil with 20% carbon content is increased by one order of magnitude. The increase of methane adsorption capacity is mainly due to the porous structure of biochar. The adsorption characteristics of biochar modified soil are in accordance with Lagergren quasi-second-order adsorption kinetic model and Langmuir isotherm adsorption model.
【作者单位】：河海大学岩土工程及堤坝工程教育部重点实验室;江苏省岩土工程技术工程研究中心;九江职业技术学院;
【基金】：中央高校基本科研业务费项目(2017B00914)
【分类号】：X799.3

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