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

Yili Liu and Jianguo Liu
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Yili Liu: School of Automobile, Chang’an University, Xi’an 710064, China
Jianguo Liu: School of Environment, Tsinghua University, Beijing 100084, China

IJERPH, 2020, vol. 17, issue 7, 1-14

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.

Keywords: landfill; leachate collection system (LCS); biochemical clogging; column experiment (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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