Isolation of hazardous soil contaminated by DU (depleted uranium) from groundwater
2012 (English)In: Waste Management and the Environment VI / [ed] V. Popov; H. Itoh; C.A. Brebbia, WIT Press, 2012, 297-308 p.Conference paper (Refereed)
Cappings of waste piles conventionally contain a drain layer over a low-permeable clay liner composed of smectite minerals. The rate of percolation of the clay liner, once it has been largely water saturated, determines the downward migration of water into and through the underlying waste. In desert climate, cyclic variation in the degree of hydration of the clay takes place, from desiccated to largely water saturated conditions. Clays of smectite type effectively seal off the underlying waste but the content must be low for preventing contraction and expansion causing a reduced isolation potential of the liner. Penetration of the liner, implying wetting of the waste, starts when the top liner is largely water saturated but the hydration followed by dehydration is confined to take place only to a limited depth according to the assumed wetting mechanism. The rate of wetting usually follows a log time law. For an ideal composition and density of the upper clay liner there will be no percolation and wetting of the underlying waste. The paper is focused on the mechanisms involved in hydration/dehydration of top clay liner prepared by mixing clay and ballast material for providing a basis for design, construction and maintenance of well performing cappings.
Place, publisher, year, edition, pages
WIT Press, 2012. 297-308 p.
, WIT Transactions on Ecology and the Environment, ISSN 1743-3541 ; 163
hazardous waste, depleted uranium, landfill, groundwater, contamination, microstructural modelling, Civil engineering and architecture - Geoengineering and mining engineering
Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
Research subject Soil Mechanics
IdentifiersURN: urn:nbn:se:ltu:diva-29412DOI: 10.2495/WM120271ScopusID: 84867909722Local ID: 2e2a3e0d-da21-4288-af39-690833eb02adISBN: 978-1-84564-606-6ISBN: 978-1-84564-607-3 (PDF)OAI: oai:DiVA.org:ltu-29412DiVA: diva2:1002636
International Conference on Waste Management and the Environment : 04/07/2012 - 06/07/2012
Validerad; 2012; 20120530 (svek)2016-09-302016-09-30Bibliographically approved