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Published in J Environ Qual 8:503-510 (1979)
© 1979 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Crushed Limestone Barriers on Chromium Attenuation in Soils1

Juan Artiole and Wallace H. Fuller2

ABSTRACT

The influence of agricultural limestone as a low-cost landfill liner to retard the migration rate of Cr in municipal solid waste leachate through soils was studied. A limestone layer, 2 cm thick over a 10-cm depth of soil in a column, delayed the breakthrough concentration (C/Co = 1.0) of the Cr in the effluent manyfold over that without limestone. Crushed limestone was more effective in retaining the cation Cr(III) than the anion Cr(VI). Retention of Cr(III) in soils due to the presence of a limestone liner is much greater than that for other metals tested (Be, Cd, Fe, Ni, and Zn). There appears to be a combined influence on the retention of Cr between the limestone liner and soil not apparent when municipal leachate was passed through the limestone barrier and soil independently. Usefulness of limestone (ranging up to 16% at breakthrough concentration) depends primarily on the pH and volume of the solution passed through the limestone.

Key Words: agricultural limestone • heavy metals • municipal solid waste leachates

NOTES

1 Contribution from the Univ. arizona Agric. Exp. Stn. Paper no. 2819. This research was supported in part by Grant no. R 803988-1, Solid and Hazardous Waste Div., MERL, USEPA, Cincinnati, OH 45268.

2 Graduate Associate in Research and Professor, respectively, Dep. of Soils, Water and Engineering, Univ. of Arizona, Tucson, AZ 85721.

Received for publication November 21, 1978.




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