Influence of leachate on the Oligocene-Miocene clays of the İstanbul area, Turkey
Influence of leachate on the Oligocene-Miocene clays of the İstanbul area, Turkey
Oligo-Miocene clay outcrops on the European side (west and northwest part) of İstanbul were analysed. Formerly, a landfill and sanitary landfill were built on the clay. Mineral liners of the current and extending parts of the İstanbul landfill consist of these clays, since they include a considerable amount of smectite, illite, and kaolinite. With this feature, these clays are also an important candidate for the buffer material of repositories for nuclear wastes of newly planned nuclear power plants. In this context, one Miocene and two Oligocene clay samples were subjected to leachate under low stress using an odometer device during a period of 30 days, 180 days, and 360 days to understand the chemical and mineralogical transformations and subsequent changes in the clay structure. The results of this work and our ongoing other research revealed that İstanbul clays are mostly illite/smectite mixed-layer minerals. Illites considerably increased while the illite/smectite mixed-layer minerals decreased in the first 15 30 days. The kinetics of the three clays was studied to understand the reasons for the illite increase. Increase of the activation energy over time may be attributed to the successive intercalation of illite lattice layers as alteration of mixed-layer illite-smectite clays. Mineral dissolution, however, is still the primary mechanism for illitization when the low activation energy is considered. With these findings, the utilization of İstanbul clays is questionable for clay barriers of landfills or sealing material of hazardous wastes.
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- ISSN: 1300-0985
- Yayın Aralığı: Yılda 6 Sayı
- Yayıncı: TÜBİTAK
Sayıdaki Diğer Makaleler
Katarína BONOVA, Jan BONA, Martin KOVACIK, Tomas MIKUS
Influence of leachate on the Oligocene-Miocene clays of the İstanbul area, Turkey
Katarína BÓNOVÁ, Ján BÓNA, Martin KOVÁCIK, Tomás MIKUS
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Zekiye KARACIK, Ş. Can GENÇ, M. Zeki BİLLOR, Gönenç GÖÇMENGİL