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Wastewater and its treatment produce by-products that contain major nutrients essential for plant growth and human food production, such as nitrogen (N), phosphorus (P), and potassium (K) [11,12]. Modern agriculture is reliant on the massive use of NPK fertilizers. The world demand for these...
and mineral additives. It is the most widely used composite material among those that are man-made and second only to water in the entire range of materials used. The aim of this research was to assess the possibility of using fly ash from the thermal treatment of sewage sludge as an alte...