Properties of products obtained in the process of solidification and stabilization of fly ash resulting from thermal treatment of sewage sludge
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Warsaw University of Life Sciences, Institute of Environmental Engineering, Poland
Warsaw University of Life Sciences, Institute of Civil Engineering, Poland
Warsaw University of Technology, Faculty of Building Services, Hydro and Environmental Engineering, Poland
Lublin University of Technology, Faculty of Civil Engineering and Architecture, Poland
Submission date: 2023-12-21
Final revision date: 2024-04-29
Acceptance date: 2024-04-29
Publication date: 2024-06-06
Corresponding author
Piotr Wichowski   

Warsaw University of Life Sciences, Institute of Environmental Engineering, Nowoursynowska St., 02-776, Warsaw, Poland
Cement Wapno Beton 28(6) 389-408 (2023)
The article presents an analysis of the results of research on the composition of fly ash from the thermal processing of sewage sludge [SSA] collected from three incineration plants located in Warsaw, Cracow and Łódź. It determines the leaching values of selected heavy metals from the tested fly ash and ordinary class concrete C20/25 with partial replacement - up to 20% of cement with fly ash. The laboratory tests performed showed that they have a comparable granulometric composition. In contrast, the physico-chemical properties of the tested fly ashes differ from ashes from coal combustion traditionally used in concrete technology. SSA is characterized by an average lower content of silicon, iron, and aluminium oxides with a much higher content of phosphorus oxides. Leaching tests indicate low mobility of heavy metals, meeting Polish regulations regarding the possibility of using SSA in construction for specific applications. At the same time, they do not pose a significant threat to human health or the environment. Construction waste containing SSA may be disposed of in inert waste landfills.
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