CAJ | 학술논문

填埋场覆盖层生物气扩散规律和甲烷氧化能力的评估是甲烷减排研究的重要组成部分。以数值模拟方法分析了氧气在覆盖层中的扩散规律，得到了指数方程形式的氧气扩散模型（R2范围0.8941～0.9975）；通过检测有机碳和甲烷浓度变化进一步考察了模拟覆盖层不同深度的甲烷氧化能力，证实了在0.05～0.25 m范围内甲烷氧化活性最高；以Fick定律和轴向扩散模型推导了模拟覆盖层中氧气消耗通量模型，该模型计算得到的氧气消耗通量与覆盖层中微生物甲烷氧化经验方程相比无显著差异；结合以上模型推演出覆盖层甲烷消耗通量模型，与实际检测值相比，预测结果理想（R2=0.9983）。该成果可为揭示填埋场覆盖层生物气扩散规律、强化甲烷氧化能力以及预测甲烷排放提供新的思路和理论依据。
전매장복개층생물기확산규률화갑완양화능력적평고시갑완감배연구적중요조성부분。이수치모의방법분석료양기재복개층중적확산규률，득도료지수방정형식적양기확산모형（R2범위0.8941～0.9975）；통과검측유궤탄화갑완농도변화진일보고찰료모의복개층불동심도적갑완양화능력，증실료재0.05～0.25 m범위내갑완양화활성최고；이Fick정률화축향확산모형추도료모의복개층중양기소모통량모형，해모형계산득도적양기소모통량여복개층중미생물갑완양화경험방정상비무현저차이；결합이상모형추연출복개층갑완소모통량모형，여실제검측치상비，예측결과이상（R2=0.9983）。해성과가위게시전매장복개층생물기확산규률、강화갑완양화능력이급예측갑완배방제공신적사로화이론의거。
Diffusion process of biogas and evaluation of methane oxidation in landfill cover soil are important parts of research on methane emission. Diffusion process of oxygen in landfill cover soil was analyzed by simulation, and an oxygen diffusion model fitted by exponential equation (0.8941<R2<0.9975) was developed. Potential of methane oxidation in different landfill cover depths was also investigated by analyzing organic carbon and monitoring methane concentration. The most intensive methane oxidation occurred at the layer of 0.05—0.25 m. An oxygen consumption flux model in landfill cover was derived on the basis of Fick’s law and axial dispersion model. There was no significant difference between fitted values by oxygen consumption flux model and derived values by empirical equation of biological methane oxidation. Based on the above model, a methane consumption flux model was derived finally, and the prediction was consistent with detection. These results provided new ideas and theoretical basis for revealing biogas diffusion process in landfill cover soil, intensifying methane oxidation capability and predicting methane emission.