生活垃圾填埋堆体孔隙结构模拟实验的CT测量分析  

CT MEASUREMENT ANALYSIS FOR SIMULATION EXPERIMENT OF PORE STRUCTURE OF DOMESTIC WASTE LANDFILL PILE

作　　者：张路遥 刘心怡 吴双 李振山[1,2] ZHANG Lu-yao;LIU Xin-yi;WU Shuang2;LI Zhen-shan(Beijing Engineering Research Center for Advanced Wastewater Treatment,College of Environmental Science and Engineering,Peking University,Beijing 100871,China;School of Environment and Energy,Peking University Shenzhen Graduate School,Shenzhen 518055,China)

机构地区：[1]北京大学环境科学与工程学院北京市新型污水深度处理工程技术研究中心,北京100871 [2]北京大学深圳研究生院环境与能源学院,广东深圳518055

出　　处：《环境工程》2018年第12期165-170,共6页Environmental Engineering

基　　金：国家科技支撑计划项目(2011BAJ07B04);重大研究计划(KDC201600028)

摘　　要：生活垃圾堆体作为一种多孔介质,其孔隙的结构及分布均影响垃圾降解和水气运移。采用CT技术测量生活垃圾模拟填埋堆体初始和降解后状态的孔隙结构,并选取降解初始和稳定阶段的2个时刻扫描图像中垃圾堆体内部的孔道长度、孔喉面积、孔隙配位数及孔隙连通参数,对其进行对比分析。结果表明:微生物降解极大地改变了垃圾堆体内部的孔隙。从孔隙参数的绝对数值看,垃圾的降解使垃圾孔隙度、孔道密度、孔喉密度、配位数均得到减小。从孔隙参数的分布规律看,垃圾的降解使垃圾孔道长度分布更趋于单调下降,孔喉面积分布由单调下降向单峰分布转化,配位数分布的幂函数下降规律保持不变,但是下降梯度变大。As a porous medium,structure and distribution of the pores of domestic waste pile can affect decomposition of waste and water-gas flow. In this study,CT technology was adopted to measure the initial and post-degradation pore structure of simulated landfill pile of domestic waste,and commercial software was utilized to extract pore length,pore throat area,pore coordination number and porosity communication parameters in waste pile from the images scanned at these two time moments, so as to carry out comparative analysis. The results showed that microbial degradation incurred a considerable change to pore structure of waste pile. The absolute figures of pore parameters showed that decomposition of waste could result in reduction of porosity,pore path density,throat density and coordination number. And in terms of the distribution rule of pore parameters, decomposition of waste made the distribution of path length tended to decrease monotonically,the distribution of throat area transformed from monotonic decrease to unimodal distribution,and the coordination number remained the power-function decrease law,but the descending gradient became larger.

关 键 词：生活垃圾 模拟实验 CT技术 孔隙结构 降解影响 

分 类 号：X799.3[环境科学与工程—环境工程]