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FENG Shi-jin, PENG Ming-qing, CHEN Zhang-long, CHEN Hong-xin. One-dimensional transport of transient diffusion-advection of organic contaminant through composite liners[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(5): 799-809. DOI: 10.11779/CJGE202205002
Citation: FENG Shi-jin, PENG Ming-qing, CHEN Zhang-long, CHEN Hong-xin. One-dimensional transport of transient diffusion-advection of organic contaminant through composite liners[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(5): 799-809. DOI: 10.11779/CJGE202205002

One-dimensional transport of transient diffusion-advection of organic contaminant through composite liners

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  • Received Date: May 17, 2021
  • Available Online: September 22, 2022
  • Using the fully transient diffusion-advection transport model for transport of organic contaminant in GMB/GCL/SL composite liner, a series of parameter sensitivity studies are conducted to analyze the influences of several important parameters on the barrier performance of the composite liner. The results show that: (1) When the leachate head is 10, 5, 3 and 0.3 m, the breakthrough time obtained by the full advection model is higher by 233%, 151%, 111% and 24% than that obtained by the local advection model, respectively. (2) It is appropriate to use hw as an alternative for hd for simplification. (3) The breakthrough time of the composite liner with f-HDPE geomembrane is 36%, 33% and 22% higher than that with PVC, LLDPE and HDPE, respectively. (4) When the leachate head is 10, 5 and 1 m, the breakthrough time will be overestimated due to ignoring the effects of advection by 68%, 34% and 6%, respectively. (5) When the frequency of holes increases from 2.5 to 50, 30, 10 and 5 ha-1, the breakthrough time decreases by 54%, 41%, 16% and 6%, respectively. (6) The effective diffusion coefficient of SL decreases by 90%, and the breakthrough time of the liner increases by 2 ~ 6 times. The adsorption coefficient of SL increases from 1 mL/g to 5, 15, 30 and 50 mL/g, and the breakthrough time increases by 311%, 1086%, 2249% and 3798%, respectively. The above research results may provide some reference and suggestions for the use and improvement of the liner in practice.
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