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Evaluation of leachate production and level in municipal solid waste landfills considering secondary compression

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Abstract

Landfilled municipal solid waste (MSW) in developing countries generally produces a large amount of leachate due to high moisture content. The estimation of leachate production and level is of great importance to the capacity design of leachate treatment plants and the stability analysis of landfills. In this study, the leachate production ratios (the ratio of leachate mass to waste mass) in different countries and cities were first summarized to reveal the basic status of leachate generation. Then, a model was established to calculate the leachate production and level that considers the rainfall infiltration and the water released from MSW due to both primary and secondary compression (ignored in previous models). Finally, the proposed model was used in a case study of Laogang Landfill in Shanghai, China. It was found that the leachate proportion produced by compression was much higher compared with that produced by rainfall infiltration, ranging from 49 (rainy season) to 93% (dry season). The leachate released from waste due to secondary compression accounted for a high proportion (up to 25%) of the total leachate production, especially for aged MSW. The calculated leachate discharge amount and leachate level were close to the measured values because the possible low permeability layer at the bottom of the landfill was considered in this model.

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Source: a: Lee et al. 1997; b: Mishra et al. 2016; c: Qian et al. 2002; d: Ehrig 1983; e: Tatsi and Zouboulis 2002; f: Yildiz et al. 2004; g: Pantini et al. 2014

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Source: a: Yang et al. 2015; b: Shekdar 2009; c: Sharma and Jain 2019; d: Pulat and Yukselen-Aksoy 2013; e: Papageorgiou et al. 2009; f: Milke et al. 2008; g: Buttol et al. 2007

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All data generated or analyzed during this study are included in this published article.

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Funding

The work is funded by the National Natural Science Foundation of China (Grant no. 52108348), the National Key Research and Development Program of China (Grant no. 2019YFC1806000), and the China Postdoctoral Science Foundation (Grant no. 2021M692836).

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Contributions

HK established the mathematical model. CSZ performed the calculation and wrote the original manuscript. JH supervised the calculation and revised the manuscript. YMC led the project. JWL and RQ carried out investigations and provided data. All authors read and approved the final manuscript.

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Correspondence to Jie Hu.

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The authors declare that they have no competing interests.

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Responsible Editor: Ta Yeong Wu.

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Ke, H., Zhang, C.S., Hu, J. et al. Evaluation of leachate production and level in municipal solid waste landfills considering secondary compression. Environ Sci Pollut Res 29, 20542–20555 (2022). https://doi.org/10.1007/s11356-021-17209-8

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  • DOI: https://doi.org/10.1007/s11356-021-17209-8

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