Windrows are long triangular piles of soil. These are formed out of the excavated material that is destined for treatment.

Windrowing involves aeration and mixing of contaminated soil by mechanical processing, addition of nutrients (and in some cases microorganisms), and control of moisture content by periodic addition of water / covering with special fleeces.

In most cases contaminated soils are excavated and treated at a site where liquid migration (runoff and leachate) can be controlled by construction of barriers (compacted clay or plastic liners). Degradation processes in windrows are principally biological. Photochemical oxidation and volatilisation may be significant in some cases.


This flowchart illustrates all possible stages of the remediation process and is fully interactive; click on each process box for a detailed description...