| Popis: |
Containment of chemical wastes in near-surface and repository environments is accomplished by designing engineered barriers to fluid flow. Impermeable barriers are intended to contain wastes for subsequent cleanup treatment or for longer-term isolation in cases where no effective cleanup treatment yet exists. Impermeable barriers also have recently been applied as components of "funnel and gate" approaches to selectively channel contaminated fluid flow through a reactive treatment zone. Containment barrier technologies such as clay liners, soilibentonite slurry walls, soiliplastic walls, artificially grouted sediments and soils, and colloidal gelling materials are intended to stop fluid transport and prevent plume migration. However, despite their effectiveness in the short-term, all of these barriers will exhibit geochemical or geomechanical instability over the long-term resulting in degradation of the barrier and its ability to contain waste. |
