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Usability analysis of bottom sediments from the Slnečné jazerá Lakes in Senec

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Author(s): Renáta Adamcová | Juraj Miškolczi | Tatiana Durmeková | Martin Bednarik | Inge Wimmer-Frey | Martin Valter

Journal: Acta Geologica Slovaca
ISSN 1338-0044

Volume: 2;
Issue: 2;
Start page: 85;
Date: 2010;
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Keywords: Slnečné jazerá Lakes | bottom sediments | soil | road embankments | mineral liner of landfill

ABSTRACT
Technology applied for revitalization of the Slnečné jazerá Lakes in Senec (town in western Slovakia) produced a temporary landfill of pumped and separated fine-grained bottom sediments. To minimize disposed waste, landfilled sediments were analysed and some potential geotechnical and environmental applications were considered. Mineral composition was studied by the X-ray diffractometry. Grain-size analyses and tests on Atterberg consistency limits allowed the engineering-geological classification: sandy (clayey) silt sa(cl)Si according to EU standards or F3 and F5, symbols MS and MI, according to STN 72 1001. Other tests: moisture, consistency and compactibility; on compacted samples, dry bulk density, compressibility and hydraulic conductivity. Geochemical analyses included: soil reaction pH, cation exchange capacity (CEC), organic matter (Corg) and carbonates. Dangerous substances were analysed earlier. Comparison with relevant technical standards and limits given by law followed. Although no contamination limits for soils were reached, the sediments are neither suitable for a direct application to agricultural nor to forest soils, as Corg is insufficient (2.5%). Nor any direct geotechnical application was found, the moisture is too high (53.3%) – they are liquid, impossible to compact, therefore, not suitable for road embankments or mineral liners of landfills. All other problems are less significant. Addition of peat or compost to improve the soil fertility could bring the only one feasible practical application; treatment is suitable especially for decorative plants, efficiency must be considered. Moisture reduction/consistency change cannot be reached by temporary landfilling because of low hydraulic conductivity. Other drying methods are expensive.
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