Nickel and chromium removal efficiency using a horizontal subsurface wetland

Abstract

This study assessed nickel and total chromium removal using a horizontal subsurface flow constructed wetland. Analysis of these metals concentration in Cyperus Alternifolius plant was carried out at first. Subsequently, removal kinetics of contaminants in the wetland were evaluated, obtaining a better fit to the Monod model for both metals. Determination of nickel and total chromium content in the effluent from the National Domestic Household Producer Industry (INPUD “1ro de Mayo”) was also carried out and removal of the employed metals in the wetland was evaluated. The removal efficiency obtained for these metals using standard solutions and the INPUD wastewater was above 98%. Greater retention of metals was obtained in the plant, mainly in roots and leaves evidencing the importance of this component in metal elimination process. It was also observed a predominance of nickel accumulation in the leaves, presenting a high bioavailability.