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Effect of Municipal Solid Waste Leachate Composition on Zinc Migration through Soils¹

ABSTRACT

The relative impact of adjusting two main constituents of municipal solid waste (MSW) leachate, total organic carbon (TOC), and total soluble salts (TSS) on Zn migration through soils was evaluated. Four Zn-enriched leachates of different TOC and TSS composition were perfused through five soils. The effluents from the 20 soil columns were collected and analyzed for the presence of Zn. Solution displacement continued until the concentration of the Zn in the effluent equaled that of the influent (100 mg L^–1). In general, higher TOC and TSS levels in the leachate facilitated the migration of Zn through soil. The soil properties associated with Zn retention were, in order of importance, surface area, cation exchange capacity (CEC), and percent clay content. The TOC and TSS content of the MSW leachate studied were found to be more important in determining Zn attenuation behavior than soil characteristic.

Key Words: Zinc attenuation • Breakthrough curves • Zinc adsorption • Total soluble salts • Total organic carbon • Landfill leachate

¹ Research supported by the Dep. of Soil and Water Sci., Univ. of Arizona, Agric. Exp. Stn. Grant no. 4376, and USEPA Grant no. R80573-01.

² Research fellow, School of Public Health, Harvard Univ., Cambridge, MA 02138; and professor of soil microbiology, Dep. of Soil and Water, Univ. of Arizona, Tucson, AZ, respectively.

Received for publication June 2, 1986.

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