Experimental Study on Impermeability of Impervious Slurry in Landfill

Abstract

The quantity and harmful ingredients of municipal solid waste are increased with the acceleration of urbanization which sets a higher request to the impervious performance of landfill. This paper takes the method of orthogonal experiment to prepare impervious material based on the modified bentonite. The effects of main components on the impervious properties are also researched. The experiment shows that critical aperture of the impervious slurry will reduce with the increase of cement and bentonite. This will enhance the impermeability of the slurry. The influence of cement on the permeability is more significant than that of bentonite. The experiment also finds that the permeability of the pulp reduces with the increase of Na2CO3 and polyvinyl alcohol (PVA). In the microstructure, the number of macropores and the critical aperture increases with the increase of Na2CO3 and PVA. This results in the improvement of permeability for impervious slurry.