Incorporation of Mg-modified zeolite in municipal solid waste compost reduces heavy metal concentration in soil and corn plant
Paper Details
Incorporation of Mg-modified zeolite in municipal solid waste compost reduces heavy metal concentration in soil and corn plant
Abstract
Heavy metals in municipal solid waste (MSW) composts mostly result in soil contamination if no appropriate management is conducted before the land application. In order to decrease the concentration of Pb, Cu, Mn, Zn, Ni and Cd in compost and as a result reduce the heavy metals uptake by corn plant, three rates including 5%, 10% and 15% (weight basis) of natural and Mg-modified zeolites were applied to the MSW composting process. A greenhouse experiment was done in order to investigate potential effects of composts containing natural zeolite- and Mg-modified zeolites- (CNZ and CMZ, respectively) on the distribution of metals in corn plant. Furthermore, accumulation of available metals in soil and plant effect on biomass production was studied. Pb, Ni, Cu, Zn, Cd and Mn in CNZ-amended soil decreased by 11%, 16%, 8%, 14%, 11% and 14% as comparison to zeolite-free compost, respectively, while in CMZ treatments, the decreases were 16%, 21%, 16%, 26%, 22% and 17%, respectively. Amended soils with compost containing Mg-modified zeolite decreased the heavy metal concentrations, up to 39%, 61% and 62%, in the roots, stalks, and leaves of corn, respectively, compared to zeolite-free compost. Compost containing zeolite (particularly it Mg-modified forms) resulted a decrease of 30 to 60 % in the Pb, Cu, Mn and Ni bioaccumulation factor in all parts of corn. The amount of dry shoot weight in CNZ- and CMZ-amended soils were 40% and 56% higher than those of soil amended with zeolite-free compost.
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