Abstract
Soil‐bentonite cutoff walls are usually used to contain the contaminants of landfills. The pumpability, permeability, and adsorption capability of the slurry are all crucial to the performance of the cutoff wall. In this study, the effect of polyvinyl alcohol (PVA) was used to improve the performance of bentonite slurry. A series of lab tests were conducted to evaluate the pumpability, permeability, and adsorption capacity with different concentrations of PVA treatment. Results show that the addition of PVA can increase the fluidity and pumpable period of slurry, which facilitates the casting and grouting during construction. The addition of PVA also helps to reduce the permeability coefficient of slurry and improve the adsorption capability which enhances the cutoff performance of the walls.
Highlights
At present, landfills are the main disposal method for municipal solid waste, accounting for 88% and 80% of terminal disposal quantity in China and America, respectively
Xie et al [7,8,9,10] evaluated the distribution of landfill leachate in Suzhou and Huainan (China) and concluded that the advection and mechanical dispersion are the major means of contaminant migration in these landfills
A possible reason for the increase in the initial fluidity of the sample with an increased amount of polyvinyl alcohol (PVA) is that the soft coating on the surface of the grains serves to reduce friction and isolate the hard grains
Summary
Landfills are the main disposal method for municipal solid waste, accounting for 88% and 80% of terminal disposal quantity in China and America, respectively. The pollution will enter the surrounding soil and rivers with the complex groundwater system which is difficult to be considered and traced It will seriously affect the surrounding environment. Xie et al [7,8,9,10] evaluated the distribution of landfill leachate in Suzhou and Huainan (China) and concluded that the advection and mechanical dispersion are the major means of contaminant migration in these landfills. It contributes to the evaluation of the construction of low permeability cutoff walls and permeable reactive barriers.
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