Abstract
The effectiveness of earthen liners in preventing the migration of heavy metals (HM) from the landfill requires the study of the transport parameters of HM and the determination of the optimum thickness of the earthen liners that can effectively retain the HM within their permissible concentrations during the lifetime of a landfill. The aim of this study is to investigate the transport behavior of four HM (cadmium (Cd), copper (Cu), lead (Pb), and zinc (Zn)) through an earthen liner via physical and numerical modeling. Subsequently, the optimum thickness of earthen liners required to prevent the breakthrough of HM for different assumed landfill life expectancies was assessed from the long-term migration profiles of HM. In general, the extent of HM migration in two types of compacted residual soil liners, which were clayey sand and silty sand, followed the sequence of Zn < Cd < Cu < Pb. It is observed that the extent of HM migration was greater in the compacted silty sand sample attributed to its higher porosity and lower HM adsorption capacities. The numerical simulations results further revealed that the optimum thickness required for compacted clayey and silty sand liners to retain the four studied HM within their regulatory threshold values for a period of 100 years were 1 m and 1.9 m, respectively. Considering the higher mobility and more stringent allowable concentration of Cd, Cd can serve as a key indicator of early HM contamination caused by leachate migration from Malaysian municipal solid waste landfills.
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Financial support for this study is provided by the Ministry of Higher Education in Malaysia with grant number FRGS/1/2017/TK01/MUSM/03/01.
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Yong, L.L., Anggraini, V., Taha, M.R. et al. Short- and long-term transports of heavy metals through earthen liners: physical and numerical modeling. Bull Eng Geol Environ 81, 69 (2022). https://doi.org/10.1007/s10064-022-02569-3
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DOI: https://doi.org/10.1007/s10064-022-02569-3