考虑甲烷氧化作用下填埋场复合覆盖层气体耦合机理研究

项目名称： 考虑甲烷氧化作用下填埋场复合覆盖层气体耦合机理研究

项目编号： No.51508508

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 建筑环境与结构工程学科

项目作者： 关驰

作者单位： 浙江工商大学

项目金额： 20万元

中文摘要： 填埋场释放的甲烷已成为全球人为释放甲烷量的重要组成，且影响程度持续增加。甲烷是重要的温室气体，控制填埋场甲烷气体的排放是减缓温室效应的有效措施。本课题首先设计填埋场土质覆盖层和含土工膜的复合覆盖层中甲烷氧化试验，通过对填埋场覆盖层中甲烷气体氧化特性的试验研究，分析影响甲烷氧化的主要作用因素，包括温度、含水量、甲烷和氧气含量、压力及覆盖层材料等。在试验结果基础上建立各影响因素与甲烷氧化速率间的定量关系式。揭示填埋场复合覆盖层中甲烷氧化作用机理，在温度场、渗流场、压力场等多场作用环境下，建立考虑甲烷氧化作用时填埋场复合覆盖层中气体的多场耦合运移模型。利用多物理场耦合分析软件COMSOL求解所建立模型，将试验结果与模型数值结果对比验证模型的正确性。进而提出填埋场覆盖层的设计类型，解决部分填埋场填埋气排放的控制缺陷，以期减缓温室效应对环境的影响。

中文关键词： 填埋气；甲烷氧化；复合覆盖层；耦合机理；迁移

英文摘要： Methane (CH4) emission has become increasingly essential for landfills, which contribute to a significant fraction of the total anthropogenic methane emission globally. Methane is the important greenhouse gas, and controlling methane emissions from landfills is an effective measurement to mitigate effect of greenhouse. In order to understand the limits and dynamics of CH4 oxidation in landfill cover soils, we design the experiment of CH4 oxidation in landfill cover soil, and investigate the CH4 oxidation rate as a function of temperature, soil moisture, CH4 and O2 concentration, pressure and cover material and so on. Reveal the mechanism of methane oxidation in landfill cover. Then the multi-field coupling model of landfill gas migration through landfill cover considering effect of methane oxidation is proposed in the environment of temperature field, seepage field, stress field and other fields in landfill cover layer. The model proposed will be solved by the COMSOL Multiphysics software. The reliability of the coupling model was validated by comparing the simulated data on gas concentrations with the measured data. And then the design of landfill cover type will be put forward, to solve the defect of landfill and greenhouse gas control for part of landfills, and mitigate the impact of greenhouse effect on the environment.

英文关键词： landfill gas;methane oxidation;composite landfill cover;coupling mechanism;migration