Study on Solid and Pore Structures of Borehole Municipal Solid Waste Samples by X-Ray CT Scanning
2025
Xiaobing Xu | Zhiyu Zhang | Jie Hu | Han Ke | Lei Lang | Changjie Chen
The microscale solid and pore structures of waste is crucial for the bio-hydro-mechanical behaviors of landfilled municipal solid waste (MSW). The quantitative analysis of the structural characteristics of MSW is still limited. In this study, borehole MSW samples at different depths (i.e., 0 m, 2.5 m, 5 m, 7.5 m, 10 m, and 12.5 m) were drilled from a landfill. The waste composition and basic physical properties of these samples were tested in laboratory. Solid and pore structural characteristics were studied through computed tomography (CT) analysis. The results indicate that the ratio of cellulose content to lignin content (i.e., C/L) decreased from 0.85 to 0.47 with increasing depth. For solid particles, two-dimensional (2D) particles constituted the greatest fraction (60.22~72.16%), which showed a decrease with increasing depth. The deeper sample tended to have more fine particles. For pores, the void ratio decreased from 1.68 to 1.10 with increasing depth, with more small pore channels. Meanwhile, the average pore diameter coefficient (&lambda:) decreased from 0.209 to 0.190, the pore angle (&theta:e) decreased from 29.6°: to 17.8°:, the tortuosity (&tau:) increased from 1.129 to 1.184, and the connectivity (ce) decreased from 12.0 to 4.1. These quantitative findings can further the understanding of fluid flow behaviors in landfilled waste.
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