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Proceedings of the 18
th
International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
Proceedings of the 18
th
International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
4
5 CONCLUSION
The sorption isotherms of Mg
2+
and Cl
-
on the treated and
untreated kaolin and on the treated and untreated dredged
sediment were analyzed. The adsorbed mass of ions was plotted
vs. the equilibrium concentrations. Batch sorption test results
demonstrated that the sorbed mass of magnesium cations was
higher onto the polymer treated soils compared to the untreated
soils. These results are promising in view of metals retention in
polymer treated dredged sediments. To further demonstrate the
higher retention ability of polymer treated clays, the adsorption
of heavy metals on kaolin, bentonite and dredged sediments is
currently under investigation.
Hydraulic conductivity test results of treated and untreated
soils were shown. The hydraulic conductivity to seawater of the
kaolin treated with 8% of the polymer was lower compared to
that of the kaolin treated with 2% of the polymer. This result
demonstrates that the hydraulic performance of a kaolin clay
increases (the hydraulic conductivity decreases) with increasing
polymer dosage. The hydraulic conductivity to seawater of the
dredged sediment treated with 8% of the polymer was
significantly lower compared to that of the untreated dredged
sediment. These results suggest the possible reuse of dredged
sediments as alternative low cost impermeable barrier materials
to isolate polluted sites and landfills.
6 ACKNOWLEDGEMENTS
The authors would like to acknowledge former thesis students
(S. Lerno and R. Van den Steen) and technical staff (J. Van der
Perre) for helping with the experiments.
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