 Articles by Steve D Evans on ArticleSnatch.com
Steve D Evans is an author at ArticleSnatch.com Article Directory. Below are the most recent articles from Steve D Evans. For more of articles by Steve D Evans please use the link above.
Waste Degradation and the Idea of Acceptable Release Rate
Every landfill is an engineering project with an engineered leachate management system. Any landfill liner is part of the system. The system should be designed to accommodate a range of seepage rates from very low (the best containment that can be achieved) to high (a controlled form of dilute and attenuate) depending on the degree of environmental protection needed at that site.
Many guidance documents or statutory assessment methods use absolute terms such as "total containment", "prevention of leachate and landfill gas migration", or "impermeable". These terms can lead to the erroneous belief that such concepts are achievable, and that failure to do so is indicative of poor materials or workmanship.
Consideration of material properties demonstrates that, as all materials have a finite permeability, some finite seepage is inevitable.
For example, the frequently quoted requirements for one metre of clay with a maximum permeability of 10-9 m/s and a maximum leachate head of 1 metre implies, using Darcy's Law, a seepage rate of 1.7 m^/d/ha, and yet it is commonly referred to as the provision of "total containment".
Actual flow rates are affected by a range of ameliorating and aggregating factors.** End Summary**About the Author:
Author Steve Evans has been writing about landfill daily cover and many other aspects of practical waste and secondary resource management since 2006. As you have been reading this article, there is a fair chance that you may enjoy his blog. We recommend a visit now!
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