Potential usage of fly ash and bottom ash from thermal power plant 'Nikola Tesla' landfill, Serbia

U Srbiji je pepeo dugo bio označen kao opasan otpad. Usvajanjem odgovarajućih zakona, pepeo je postao otpad sa upotrebnom vrednošću, što je omogućilo razmatranje mogućnosti njegovog korišćenja. U ovom radu je izvršena analiza sastava pepela i šljake koji su odloženi na deponiju termoelektrane 'Nikola Tesla A'. Trideset uzoraka, podeljenih u tri seta, analizirani su na mikroelemente As, Ba, Be, Cd, Co, Cr, Cu, Mn, Mo, Ni, Pb, Ti, V i Zn. Procenjene su varijacije u kvalitetu, i na osnovu dobijenih rezultata procenjena je mogućnost daljeg korišćenja u proizvodnji cementa i betona.In Serbia, the ash from power plants has long been labelled as hazardous waste. With the adoption of the appropriate legislation this ash became waste with the potential usage. In this paper an analysis of the fly ash and bottom ash composition, which are disposed of in the power plant 'Nikola Tesla A' landfill, is presented. Thirty samples, divided into three sets, were analyzed for trace elements As, Ba, Be, Cd, Co, Cr, Cu, Mn, Mo, Ni, Pb, Ti, V and Zn. The first and second set of samples were taken at the depth of 0.0-0.6 m, from cassette III, at the place of waste discharge (set I) and in the centre of the cassette (set II).The third set of samples was taken from the same cassette spot but at the different depth. The estimated variations in quality within individual sets, as well as the comparison between sets I and II, were performed. The repeatability of results by the depth of cassette (set III) was also analyzed. The mixture consisting of 79.4% limestone, 17% clay, 0.5% sand, 0.55% iron ore, 0.55% of steel mill waste and 2% ash from the thermal power plant 'Nikola Tesla A' was adopted as the reputable mixture for cement making. For concrete making, the same cement mixture was used but with 2.1% of the same ash material added. The results showed possibility of further fly and bottom ash use as the cement and concrete material