engleski

Surface changes in two aged coal ash landfills in Croatia

Coal combustion produces nearly 1 billion tonnes of coal combustion residuals (CCR) annually, of which 40-50% is disposed. Regulated landfills and ash ponds are usually properly lined and have leachate collection systems, but old landfills usually lack these pollution prevention measures. Two such landfills are located in Croatia and were characterized by various physical and chemical analysis techniques to evaluate soil formation, trace element distribution and release of contaminants. The ashes have predominantly silt and sand fractions and a relatively large specific surface area. However, they differ in chemical and mineralogical composition, as indicated by different concentrations of trace elements, pH, and calcite content. The release of contaminants differs between landfills due to various processes such as cementation, depletion of elements and pedogenesis. This study highlights the neglect of old abandoned landfills and their changes as the waste ages.

Coal ash ; cation exchange properties ; pedogenesis

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