Abstract
A study has been carried out in order to investigate both the role of organic compounds present in sludges and the effect of their decomposition on the adsorption process of copper(II) following application of sludges to soils. Strong interactions occur between soils and water soluble organic compounds of sewage sludges applied to agricultural soil. These interactions influence the adsorption process of the metals; this is promoted by the change in the nature of organic matter that occurs during the decomposition process. The results obtained with soil samples treated by us with the liquid phase of a sewage sludge (LPS), and with soil portions collected in a neighbouring zone treated 10 years ago with sewage sludges have been compared. It appears clear that the behaviour of the soil treated with LPS allows prediction of the adsorption pattern of the sludge-amended soil towards heavy metals.
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