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The paper deals with an evaluation of flotation application suitability in the sludge decontamination from the Cerny Prikop stream situated in the City of Ostrava (Czech Republic). Application of flotation on the given samples is highly effective and the acquired results are excellent. We used 2 conventional flotation collectors (Montanol 551, Flotakol). Flotation of organic pollutants is very effectual and more than 75 \% of hydrocarbons C10 – C40, 70 \% of PCB and 80 \% of PAH from the sediments was removed.

The paper deals with an examination of possible application of biodegradation in the decontamination of soil samples from international airport in Ostrava. The laboratory biodegradation tests were carried out with a pure bacterial culture of Pseudomonas putida, a pure laboratory culture of Rhodococcus sp, their mixture and a mixture prepared combining their media free of bacteria. The results of the paper imply that for biodegradation of airport pollutants is most suitable to apply a mixed bacterial culture of Pse...

The goal of the work was verification of floatabilty of bituminous coal from mine Staszicz with different collectors (Flotalex and Montanol), which are generally used in coal cleaning plants in Czech Republic and Poland. From the flotation and petrological results follows that floatability of given coal is approximately equal at Flotalex and Montanol application.

The paper deals with a potential utilization of a laboratory device of a column flotation machine for the flotation of coal. The flotation tests, which were carried out in the laboratory of the Institute of Environmental Engineering at the Faculty of Mining and Geology of V\vSB-TU Ostrava, made use of samples of black coal slurries from Darkov Mine in the Ostrava-Karvin\'a District. The research was aimed to identify optimal condensation of the flotation pulp as well as the most efficient flotation time. The follo...

The aim of this paper is to evaluate the suitability of a coal sample from the mine CSA for bacterial leaching. Laboratory research used a pure bacterial culture of Thiobacillus ferrooxidans . The results showed that bacterial leaching was effective, with a one month leaching time, when 68\% of total sulphur and 68\% of pyritic sulphur was leached. The paper describes changes to the pyrite during and after bacterial leaching.