准好氧填埋氧气扩散模拟分析  

Simulation on Diffusion of Oxygen in Semi-aerobic Landfill

作　　者：丁世存[1,2] 黄启飞[1] 金典[1,2] 庞香蕊[3] 

机构地区：[1]中国环境科学研究院固体废物污染控制技术研究所,北京100012 [2]北京科技大学土木与环境工程学院,北京100083 [3]辽宁大学环境与资源学院,辽宁沈阳110036

出　　处：《环境科学与技术》2010年第1期102-106,共5页Environmental Science & Technology

基　　金：国家自然科学基金项目(50508042);中国环境科学研究院公益性行业专项(2007KYYW24)

摘　　要：依据准好氧填埋工艺的原理建立了试验装置,在填埋进入相对稳定期后,测定填埋装置内各个采样点的填埋气体积分数φ(CH)4、φ(CO)2以及φ(O)2,分析了采样点到中心导气管的距离对φ(O)2的影响,并采用数学模型进行拟合。结果表明,准好氧填埋进入相对稳定期后,由于装置内外温度差异以及氧气浓度的差异使氧气通过导排管进入装置内部,并呈现出上层>下层>中层的规律。在垃圾填埋体的好氧分解反应、硝化作用以及甲烷氧化作用的共同作用下,下层与中层φ(O)2与距离的关系呈现指数规律下降,上层由于结构的特殊性呈现抛物线形状。According to theory of semi-aerobic landfill, lab scale installment was set up. During the steady stage of landfill process, the volume fraction of methane, carbon dioxide and oxygen were detected in different sampling points. The effect of distance between sampling point and central gas tube to the volume fraction of oxygen was analyzed and simulated with mathematic model. Results showed that in the steady stage of semi-landfill, volume fraction of oxygen in different layers showed certain trend because of oxygen diffusing which resulted from the difference of temperature and oxygen concentration between inside and outside installment. With the combined effect of aerobic decomposition reaction, nitrification and methane oxidation in pile, volume fraction of O2 in bottom layer and middle layer declined under exponential law and volume fraction of O2 in upper layer showed parabolic shape because of its special structure.

关 键 词：准好氧填埋 填埋气 氧气 迁移扩散 数值模拟 

分 类 号：X830.2[环境科学与工程—环境工程]