Geochemische Prozesse in kohlehaltigen wassergesaettigten Abraumsubstraten Abschlussbericht

The report refers to a large-scale lysimeter experiment with two quaternary and tertiary spoil bank substrates typical of the Lausitz, and percolates from the unsaturated soil zone of similar spoil bank substrates (mS1-Kp and xS1-Kp; lysimeter experiment). The aim of the project under report, which complements these experiments, was to model aquifers and study the impact of the aerated, extremely acidic, carbonic tertiary substrates on the intensity of reduction processes in the saturated soil zone and the associated influence on ground water quality. For this purpose an experimental column set-up was designed permitting sampling of both the watery phase and soil air under anoxic conditions in accordance with the duration of the experiment. Soil air is sampled above all with a view to following up the decrease in oxygen concentration and increase in the organic-matter oxidation-product carbon dioxide as a measure of the progress of the reduction process. In the watery phase, it is above all changes in the parameters pH value and oxidation-reduction potential and of the solution concentrations of the reduction-oxidation pairs involved in the individual reduction-oxidation stages (Fe"2"+/Fe"3"+ as well as SO_4"2"- and S"2"-, respectively HS"-) that are covered. (orig./SR)SIGLEAvailable from TIB Hannover: F97B2115 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman