M. Bejarano et L. Madrid, SOLUBILIZATION OF HEAVY-METALS FROM A RIVER SEDIMENT BY AN OLIVE OIL MILL EFFLUENT AT DIFFERENT PH VALUES, Environmental technology, 17(4), 1996, pp. 427-432
The effect of solutions of wastewater from olive mill, called 'alpechi
n', on the solubilization of Ni, Cd, Zn, Cu, Mn, Pb and Fe present in
a sediment from Agrio river (Seville, Spain) at pH 3, 4 and 5 is studi
ed. Metal solubilized by alpechin solutions is compared with data from
different fractions of metal speciation of the sediment. The data sho
ws that the dominant effect is pH for all metals with the exception of
Fe and Mn. Within a given pH, it is shown that the presence of alpech
in solutions causes mobilisation of most metals studied at pH 5 except
Cd and Zn and this effect is progressively less marked as pH decrease
s, so that at pH 4 mobilisation is detected for Ni, Cu, Mn and Pb, and
at pH 3 only is noticeable for Ni and Mn. The joint effect of pH and
of the presence of alpechin is the release of amounts of metals which
are comparable to those metal fractions attributed to exchangeable and
bound to carbonates.