The coal combustion process is the basic method of electricity production in Poland. The wastes from this process are slag and exhaust fumes which contain fly ash and gases (n 2 , H 2 O, SO x , nO x , CO, CO 2 , carbohydrates, and aldehydes). The main disadvantage of the currently used combustion technologies is the emission of pollutants, mainly CO 2 , into the atmosphere, as well as the low efficiency of power units (kordylewski 2005; Ściążko 2009). In Poland, the wastes resulting from the energetic combustion of coal are mainly neutralized by landfilling and they are therefore seen as a threat to the environment (łączny 2002). On the other hand, fly ash can be used in environmental protection, including air protection (for desulphurization and removal of CO 2 from exhaust gas), surface waters (for removing the causes of eutrophication of lakes), groundwater (for creating protective barriers) and for the recultivation of degraded areas (