LIMESTONE LINER FOR LANDFILL LEACHATES CONTAINING BERYLLIUM, CADMIUM, IRON, NICKEL, AND ZINC

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Abstract
The influence of crushed agricultural limestone, placed in a layer over 6 soils, on the rate of migration of Be, Cd, Fe, Ni and Zn contained in municipal, solid-waste, landfill leachate [was evaluated]. The limestone was highly effective in slowing the rate of migration of Be, Cd, Ni, and Zn in all 6 soils, which represent 5 major soil orders of the USA. Not only breakthrough (C/Co = 0.5) but also final breakthrough (C/Co = 1) values were significantly delayed (2-fold- to 3-fold) over soil alone. The limestone effect was considerably more than additive, i.e., several times more than the sum of soil alone plus limestone alone. The limestone effects were not the same for the individual metals. Attenuation effects were greatest for Be and least for Cd. The migration rate of Fe, indigenous to the landfill leachate, also was favorably slowed by the limestone barrier layered over the soils.

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