Abstract
The Luhuagang landfill site (LLS) in Kaifeng, China, lacks liner and leachate collection systems. Thus, leachate generated from the waste dump has contaminated the surrounding subsoil and shallow aquifer with various chemicals, including 1,2,4-Trichlorobenzene (1,2,4-TCB). This paper is a part of a series of studies on adsorption, transport and biodegradation and fate of 1,2,4-TCB in the shallow aquifer beneath LLS. Here, adsorption of 1,2,4-TCB onto silt, fine sand and medium sand aquifer deposits collected at LLS was conducted by performing batch experiments involving four common adsorption kinetic models. The results of the analyses showed that the pseudo-second-order adsorption kinetic model provided the best fit for the equilibrium data with a coefficient of determination (R 2) greater than 0.99. Least squares analysis of Henry, Freundlich and Langmuir linearly transformed isotherm models was used to establish the best isotherm for 1,2,4-TCB adsorption onto the three aquifer materials. The Freundlich isotherm provided the best fit for experimental data with R 2 > 0.99. The results further suggested that the highest adsorption rate of 1,2,4-TCB (27.55 μg/g) was onto silt deposit, followed by fine sand (21.65 μg/g) and medium sand (14.88 μg/g). This showed that silt layer beneath the LLS was critical for retarding the downward percolation and migration of 1,2,4-TCB into the shallow aquifer systems under the landfill. The findings of the study were adopted as basis for designing the slated transport and biodegradation study of 1,2,4-TCB in aquifer system at LLS.
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Acknowledgments
We thank the Nanjing Institute of Geology and Mineral Resources (Geological Survey Bureau of China) for the financial support given to the project entitled “The Migration and Transformation Mechanisms and Control Measures of Groundwater Contaminants at the Southern Suburb of Luhuagang Landfill site of Kaifeng”. We thank Dr. Su Xiao Si, in the College of Environment and Resources, Jilin University for the professional management of the project. We are grateful for the helpful comments of Dr. Raoul Desiré Gnansounou at Piteau Associate Engineering Ltd., anonymous reviewers and the board of editors for the insightful comments on this paper.
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Dong, W.H., Zhang, Y., Lin, X.Y. et al. Adsorption studies of 1,2,4-Trichlorobenzene onto shallow aquifer media at the Luhuagang landfill site in Kaifeng, China. Environ Earth Sci 71, 4353–4362 (2014). https://doi.org/10.1007/s12665-013-2829-6
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DOI: https://doi.org/10.1007/s12665-013-2829-6