BETTER DESIGN and construction of containment barrier systems are needed to reduce leachate leakage from waste, a leading geotechnical researcher said last month.
Professor Kerry Rowe said engineers should refi ne the way barrier systems are designed, built and maintained to prevent premature failure.
Rowe, vice principal of research at Queen's University, Kingston, Ontario, in Canada, was giving the British Geotechnical Association's 45th Rankine Lecture on Long term performance of contaminant barrier systems at Imperial College in London.
Barrier systems for waste containment facilities typically include both permeable drainage and low permeability liner components, and comprise a combination of clay and geosynthetics, Rowe explained.
Long term performance depends on the selection of suitable liner material, appropriate protection of the geomembrane, the chemistry of fl id in contact with the liner and its temperature.' A variety of problems can affect the liner, and performance of individual elements can affect the entire system, he said.
But clogging can be modelled, liner systems can be designed to extend service life, liner temperature can be reduced by better design and construction and proper consideration of operational issues.