ISSN:
0009-286X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Methods of immobilizing soil contamination. A number of remedial measures can bei applied to contain or immobilize contaminants which threat to pollute groundwater, soil or air. Some are still conceptional in character, others are in practical use. So far, bentonite/cement-based slurry walls have often been constructed to regulate the groundwater flow in contaminated areas. In general, clay layers are used as bottom seal whenever available. Investigations, however, have shown that conventional and many natural materials do not exhibit the resistance to aggressive leachates which is necessary to retain the contamination over extended periods of time. In the proposed concept a partial or complete encapsulation of the contamination is recommended using barriers resistent to aggressive leachates, thus containing the contamination. This can be achieved by new silica gel containing materials and in some cases by suitable geotextiles. Extensive tests of such materials are presently under way at various abandoned waste sites in the F. R. Germany. Remedial action can then be planned and executed to decontaminate the site in ample time and without the risk of further contamination. New results are reported obtained during a one year test period with water glass of low alkalinity and high SiO2/Na2O ratio. Their resistance to leachates, low syneresis, and high hardness was accomplished by the two-component system Dynagrout PPN, developed by Dynamit Nobel.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cite.330590506
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