Influência da adição de nitrato de cálcio e de PhoslockTM no abatimento dos fluxos de nutrientes e metais na interface sedimento-coluna de água em um sistema lacustre eutrofizado
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Data
2012-02-16Autor
Oliveira, Aline Fernandes de
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This research project evaluated the changes in the fluxes of nutrients
and metals at the sediment-water interface as a result of sediment treatment by the
additions of PhoslockTM and calcium nitrate solution. The experiments were executed
in situ using mesocosms that were assembled in the Ibirité Reservoir (MG). The
calcium nitrate addition experiments showed nutrients flux abatement for Porthophosphate,
ammoniacal-N and nitrate-N that were ≥ 90% whilst for the metals
Fe and Mn the percentages reached 48 and 69%, respectively, as a result of
sediment oxidation promoted by the intensification of denitrification rates. For the
PhoslockTM addition the percentages of reduction in the fluxes across sediment-water
interface was over 90% for P-orthophosphate and ammoniacal-N, 78% for nitrate-N
and for the metals, Fe and Mn, 47 and 50%, respectively, as a result of the increased
adsorption capacity of sediments due an excess of adsorbent material left on
sediment surface.