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The BioChemical Clogging of Landfill Leachate Collection System: Based on Laboratory Studies

Author

Listed:
  • Yili Liu

    (School of Automobile, Chang’an University, Xi’an 710064, China)

  • Jianguo Liu

    (School of Environment, Tsinghua University, Beijing 100084, China)

Abstract

Leachate collection system (LCS) clogging is a common operational problem in municipal solid waste (MSW) landfills in China, which can result in high leachate levels that threaten the safety of landfill operations and subsequently increase the leachate leakage risk. In our previous research, a filtration test was conducted and the physical clogging effect was evaluated. To fully analyze the LCS failure, in this study, a set of column experiments were carried out to investigate the biochemical clogging development and mechanisms. Results showed that the biofilm and deposited CaCO 3 composed the primary clogging materials. During the experimental period, the hydraulic conductivities in simulated gravel and nonwoven geotextile drainage layers were observed (91.7% and five orders of magnitude reduction), and decreased to 10 −4 and 10 −8 m s −1 , respectively. Therefore, the significance of the geotextile layer in LCS designing needs to be reconsidered. The biochemical clogging was positively correlated with volatile fatty acids (VFAs), and Ca 2+ loading and the Ca 2+ played the dominant role. Meanwhile, an improved method for analyzing biochemical clogging development was proposed.

Suggested Citation

  • Yili Liu & Jianguo Liu, 2020. "The BioChemical Clogging of Landfill Leachate Collection System: Based on Laboratory Studies," IJERPH, MDPI, vol. 17(7), pages 1-14, March.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:7:p:2299-:d:338513
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    References listed on IDEAS

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    1. Ren Peng & Yujing Hou & Liangtong Zhan & Yangping Yao, 2016. "Back-Analyses of Landfill Instability Induced by High Water Level: Case Study of Shenzhen Landfill," IJERPH, MDPI, vol. 13(1), pages 1-17, January.
    2. Yili Liu & Weixin Sun & Bing Du & Jianguo Liu, 2018. "The Physical Clogging of the Landfill Leachate Collection System in China: Based on Filtration Test and Numerical Modelling," IJERPH, MDPI, vol. 15(2), pages 1-15, February.
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    Cited by:

    1. Mingde Xie & Xi Guo & Dan Liu, 2022. "Leachate Pretreatment before Pipe Transportation: Reduction of Leachate Clogging Potential and Upgrading of Landfill Gas," IJERPH, MDPI, vol. 19(10), pages 1-13, May.

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