Air Quality Research Center, University of California Davis, Davis, CA, USA.
Civil & Environmental Engineering, Colorado State University, Fort Collins, CO, USA.
Waste Manag Res. 2024 Nov;42(11):997-1007. doi: 10.1177/0734242X231204814. Epub 2023 Nov 28.
This study is a critical review of municipal solid waste (MSW) hydraulic conductivity that includes investigation of the influence of vertical stress, dry unit weight and degradation. A total of 56 studies were compiled that included laboratory-, pilot- and landfill-scale hydraulic conductivity experiments. Compacting waste and increasing vertical stress reduce MSW hydraulic conductivity via reshaping the pore networks throughout the waste matrix, reducing the void ratio and increasing tortuosity. However, the magnitude of reduction in hydraulic conductivity is dependent on stress, waste composition and decomposition. Solid waste decomposition can have opposing effects on hydraulic conductivity. Some studies have indicated that an increase in MSW decomposition results in particle size reduction and settlement that reduces the void ratio and decreases hydraulic conductivity. Conversely, some studies indicate that waste decomposition reduces the solid mass, which increases the void ratio and creates larger flow paths that increase hydraulic conductivity. The data compilation, observations and key findings from this study are beneficial for solid waste practitioners to improve design, analysis and operation of MSW landfills.
本研究对城市固体废物（MSW）水力传导率进行了批判性回顾，其中包括对垂直应力、干密度和降解影响的研究。共编译了 56 项研究，其中包括实验室、中试和垃圾填埋场尺度的水力传导率实验。通过重塑废物基质中的孔隙网络、减小空隙比和增加曲折度，压实废物和增加垂直应力会降低 MSW 的水力传导率。然而，水力传导率的降低幅度取决于应力、废物组成和分解。固体废物的分解会对水力传导率产生相反的影响。一些研究表明，MSW 分解会导致粒径减小和沉降，从而减小空隙比并降低水力传导率。相反，一些研究表明，废物分解会减少固体质量，从而增加空隙比并形成更大的流动路径，从而提高水力传导率。本研究的数据汇编、观察结果和主要发现有助于固体废物从业人员改进 MSW 垃圾填埋场的设计、分析和运行。
