Abstract
Abstract One of the best alternatives to waste disposal is through the soil-plant system as a fertilizer. Based on contrasting properties, different wastes can be co-recycled in order to take simultaneously the best profit and minimize environmental pollution. To predict the release of available nutrients and potentially toxic elements, before land application of two wastes (sewage sludge and fly ash), a laboratory experiment had been conducted using leaching and incubation of soil-waste mixtures. Loading rates of 500 t ha−1 of fly ash increased soluble compounds in soil solution, and the sewage sludge N-mineralization was inhibited. The proposed method could give an estimation for soluble elements and mineralizable-N compounds, avoiding undesirable land consequences of waste recycling.
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