覆盖层氧气消耗通量模型及甲烷氧化能力预测

doi:10.11949/j.issn.0438-1157.20141280

化工学报 ›› 2015, Vol. 66 ›› Issue (3): 1117-1125.DOI: 10.11949/j.issn.0438-1157.20141280

覆盖层氧气消耗通量模型及甲烷氧化能力预测

邢志林, 赵天涛, 陈新安, 车轮, 张丽杰, 全学军

重庆理工大学化学化工学院, 重庆 400054

收稿日期:2014-08-22 修回日期:2014-11-17 出版日期:2015-03-05 发布日期:2015-03-05
通讯作者: 赵天涛
基金资助:
国家自然科学基金项目(51378522);重庆市基础与前沿研究项目(cstc2014jcyjA20007)。

Simulation model for oxygen consumption flux and prediction of methane oxidation in landfill cover soil

XING Zhilin, ZHAO Tiantao, CHEN Xin'an, CHE Lun, ZHANG Lijie, QUAN Xuejun

School of Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China

Received:2014-08-22 Revised:2014-11-17 Online:2015-03-05 Published:2015-03-05
Supported by:
supported by the National Natural Science Foundation of China (51378522) and the Fundamental and Advanced Research Projects of Chongqing (cstc2014jcyjA20007).

摘要/Abstract

摘要：

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。

关键词: 覆盖层, 甲烷, 氧化, 扩散, 氧气消耗通量, 模型

Abstract:

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.

Key words: landfill cover, methane, oxidation, diffusion, oxygen consumption flux, model

中图分类号:

X505

邢志林, 赵天涛, 陈新安, 车轮, 张丽杰, 全学军. 覆盖层氧气消耗通量模型及甲烷氧化能力预测[J]. 化工学报, 2015, 66(3): 1117-1125.

XING Zhilin, ZHAO Tiantao, CHEN Xin'an, CHE Lun, ZHANG Lijie, QUAN Xuejun. Simulation model for oxygen consumption flux and prediction of methane oxidation in landfill cover soil[J]. CIESC Journal, 2015, 66(3): 1117-1125.

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覆盖层氧气消耗通量模型及甲烷氧化能力预测

Simulation model for oxygen consumption flux and prediction of methane oxidation in landfill cover soil

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