Study on Compressibility and Settlement of a Landfill with Aged Municipal Solid Waste: A Case Study in Taizhou
Abstract
:1. Introduction
2. Materials and Methods
2.1. Site Description
2.2. Experimental Materials
2.3. Experimental Methods
2.3.1. Testing Apparatus
2.3.2. Experimental Procedure
2.4. Settlement Calculation Method of MSW
3. Results and Discussion
3.1. Moisture Content Distribution
3.2. Volumetric Weight
3.3. Compression Characteristics
4. Settlement Prediction of Landfill Waste
5. Conclusions
- According to the test results, the content of kitchen waste was reduced to 0.1% after more than three years of biochemical degradation of MSW with high kitchen waste content. In developing countries (e.g., China), the content of kitchen waste in fresh MSW is high (generally higher than 50%). The impact of rapid degradation of kitchen waste should be considered in landfill settlement prediction and site reuse design (such as expansion). As for landfills with high-kitchen-waste-content MSW, it is recommended that the reuse project of the landfill sites after the kitchen waste is degraded be considered.
- The moisture content of the aged MSW generally increased with depth, and the average moisture content at a depth of 5 m was 97%. Moreover, there might be a perched water table in the landfill due to the influence of the intermediate cover layer and the heterogeneity of the MSW, which was not conducive to the collection of leachate.
- The void ratio of the aged MSW decreased from 4.0 to 2.2 with an increase in vertical load from 1 kPa to 400 kPa. The modified primary compression index of the aged MSW ranged from 0.22 to 0.27, and generally decreased with depth.
- Under the load caused by fly ash, the thickness of the aged MSW after settlement can be reduced by approximately 15% to 20% compared to the initial thickness. The compaction of landfill waste could increase the landfill capacity of fly ash by about 3 years. The influence of aged MSW settlement must be considered in the capacity expansion design of existing landfills.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Layer | Elevation | Thickness | Modified Primary Compression Index | Modified Secondary Compression Index |
---|---|---|---|---|
unit | m | m | / | / |
LW3 | >29 | 3~5 | 0.254 | 0.035 |
LW2 | 26~29 | 3 | 0.238 | |
LW1 | <26 | 7~10 | 0.23 |
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He, H.; Wu, T.; Wang, X.; Qiu, Z.; Lan, J. Study on Compressibility and Settlement of a Landfill with Aged Municipal Solid Waste: A Case Study in Taizhou. Sustainability 2021, 13, 4831. https://doi.org/10.3390/su13094831
He H, Wu T, Wang X, Qiu Z, Lan J. Study on Compressibility and Settlement of a Landfill with Aged Municipal Solid Waste: A Case Study in Taizhou. Sustainability. 2021; 13(9):4831. https://doi.org/10.3390/su13094831
Chicago/Turabian StyleHe, Haijie, Tao Wu, Xiaogang Wang, Zhanhong Qiu, and Jiwu Lan. 2021. "Study on Compressibility and Settlement of a Landfill with Aged Municipal Solid Waste: A Case Study in Taizhou" Sustainability 13, no. 9: 4831. https://doi.org/10.3390/su13094831