Why is clay best for landfills?
Clay is used in containment systems for landfill waste deposits to control the water fluxes in and out of the system.
What clay is used for landfills?
Bentonite is an extremely absorbent, granu- lar clay formed from volcanic ash. Bentonite attracts positively charged water particles; thus, it rapidly hydrates when exposed to liq- uid, such as water or leachate. As the clay hydrates it swells, giving it the ability to “self- heal” holes in the GCL.
What goes in a sanitary landfill?
Sanitary landfill is a modern engineering landfill where waste is allowed to decompose into biologically and chemically inert materials in a setting isolated from the environment (Chen et al., 2003; Pruss et al., 1999).
Are all landfills lined?
The theory behind landfills is that once waste is buried, the contamination remains inert in landfill “cells.” To keep the waste dry and contained, landfill cells today are required to have two plastic liners, each backed with synthetic clay, putting a few inches between decomposing trash and the soil beneath it.
What is a compacted clay liner?
1.3. Definition of a Compacted Clay Liner – A compacted clay liner is a seepage free barrier constructed of a cohesive soil that is compacted to increase its bulk dry density and homogeneity. The purpose is to reduce porosity and decrease soil permeability.