Experimental investigation of water retention curves of municipal solid wastes with different paper contents, dry unit weights and degrees of biodegradation

Xie, Yuekai; Xue, Jianfeng

doi:10.1016/j.wasman.2023.03.026

Waste Management

2023

DOI: 10.1016/j.wasman.2023.03.026

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Experimental investigation of water retention curves of municipal solid wastes with different paper contents, dry unit weights and degrees of biodegradation

Yuekai Xie

Jianfeng Xue

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Cited by 8 publications

References 56 publications

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Study on the water retention curve of shredded municipal solid waste considering the compressibility of specimens based on the centrifuge method

Dang,

Chai,

et al. 2024

Environ Sci Pollut Res

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The water retention curve (WRC) of municipal solid waste (MSW) is the important hydraulic parameter for the study of unsaturated seepage analysis in landfills.Due to the compressibility and degradability of the waste, the search for a method to quickly and accurately test its water retention curve (WRC) is a current problem that needs to be solved. In this paper, considering the volume change of the waste specimens in test, the test principle of centrifuge testing of WRC is corrected to make it applicable to the testing of waste WRC. In addition, the WRCs of 20 MSW specimens with typical landfill compositions and porosities are measured using the corrected centrifuge test.The effects of compositions and porosities of waste specimens on WRC parameters were analyzed. The results are summarized as follows. Disregarding the height reduction of specimens resulted in overestimated matric suction values and underestimating volume water content values. By comparing uncorrected and corrected values, the maximum difference of the matric suction and volumetric water content reach 233 kPa and 11%, respectively. This study can provide a reference for accurately measuring the WRC of MSW using a centrifuge. For the waste specimen without kitchen and yard waste, composition had less of an effect on the WRC of waste compared to porosity. The effect of the content of the non-absorbable fraction on the residual volumetric water content θr and the parameter nv in the van Genuchten model was significant. The initial porosity n had a great effect on the parameter α.

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Study on the water retention curve of shredded municipal solid waste considering the compressibility of specimens based on the centrifuge method

Dang,

Chai,

et al. 2024

Environ Sci Pollut Res

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Experimental investigations of water retention curves of fresh and decomposed municipal solid wastes under multiple drying and wetting cycles

Xie,

Xue

2024

Acta Geotech.

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Municipal solid wastes (MSWs) disposed in landfills are generally exposed to drying and wetting cycles because of the variation in environmental conditions, decomposition of organics and leachate recirculation. This paper studies the water retention curves (WRCs) of fresh and degraded MSWs under various numbers of drying and wetting cycles with water and leachate exposure. The result indicates that the water retention capacities of MSWs decrease with drying and wetting cycles. The maximum hysteresis between the drying and wetting cycles is observed in the first cycles for all MSW samples. The WRCs of medium to highly decomposed MSWs under drying and wetting cycles are similar to those of soils. The WRCs of fresh MSWs can undergo substantial changes due to the discharge of intra-particle moisture caused by decomposition and compression. For both fresh and decomposed MSWs, the WRCs stabilize after 3 drying and wetting cycles. However, only the MSWs of one initial composition with similar void ratios were investigated. Further research should be conducted to investigate the water retention behavior of MSWs with diverse initial compositions (e.g., food contents) and void ratios.

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Effects of microplastic contamination on the hydraulic, water retention, and desiccation crack properties of a natural clay exposed to leachate

Xie,

Wang,

Guo

et al. 2024

Journal of Environmental Management

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Experimental investigation of water retention curves of municipal solid wastes with different paper contents, dry unit weights and degrees of biodegradation

Cited by 8 publications

References 56 publications

Study on the water retention curve of shredded municipal solid waste considering the compressibility of specimens based on the centrifuge method

Study on the water retention curve of shredded municipal solid waste considering the compressibility of specimens based on the centrifuge method

Experimental investigations of water retention curves of fresh and decomposed municipal solid wastes under multiple drying and wetting cycles

Effects of microplastic contamination on the hydraulic, water retention, and desiccation crack properties of a natural clay exposed to leachate

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