Abstract
Leachate containment in Denmark has throughout the years been
regulated by the DIF Recommendation for Sanitary Landfill Liners
(DS/R4669. It states that natural clay deposits may be used as
membrane material provided the membrane and drainage system
contains at least 95% of all leachate created throughout the
lifetime of the landfill. Presently, the recommendation is under
revision partly because this clause was considered to be
unsufficient for securing the drinking water quality in underlying
aquifers - a necessary containment of at least 99% is foreseeen.
The revision should consequently take into account advective ion
transport as well as diffusion. Clay prospecting for clays rich in
smectite has revealed large deposits of Tertiary clay of very high
plasticity in the area around Rødbyhavn on the Danish island of
Lolland. The natural clay contains 60-75% smectite, dominantly as
a sodium-type. The clay material has been evaluated using the
standardized methods related to mineralogy, classification,
compaction and permeability, and initial studies of diffusion
properties have been carried out. Furthermore, at a test site the
construction methods for establishing a 0.15-0.3 m thick clay
membrane have been tested successfully. At a natural water content
of w=40-45% it is possible to establish a homogeneous membrane
with hydraulic conductivity k
Original language | English |
---|---|
Journal | Engineering Geology |
Volume | 54 |
Issue number | 1-2 |
Pages (from-to) | 129-137 |
ISSN | 0013-7952 |
Publication status | Published - 1999 |