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Published online 8 March 2006
Published in Vadose Zone J 5:430-444 (2006)
DOI: 10.2136/vzj2005.0039
© 2006 Soil Science Society of America
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Variably Saturated Reactive Transport of Arsenic in Heap-Leach Facilities

David L. Deckera,*, Jirka Simunekb, Scott W. Tylerc, Charalambos Papelisd and Mark J. Logsdone

a Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512 USA
b Dep. of Environmental Sciences, A135 Bourns Hall, Univ. of California, 900 University Ave., Riverside, CA 92521 USA
c Dep. of Natural Resources and Environmental Sciences and Dep. of Geological Sciences and Engineering, MS 175, Univ. of Nevada, Reno, NV 89557-0180 USA
d Desert Research Institute, 755 E. Flamingo Road, Las Vegas, NV 89119 and Water Resources Management Graduate Program, Univ. of Nevada, 4505 Maryland Pkwy., Las Vegas, NV 89154-4029 USA
e Geochimica Inc., 9045 Soquel Drive, Suite 2, Aptos, CA 95003 USA

Figure 1
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  		Fig. 1. Schematics of the three model examples.

 

Figure 2
Figure 2
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  		Fig. 2. Selected results for an uncovered heap-leach facility when the Sips-type isotherm for As sorption was used.

 

Figure 3
Figure 3
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  		Fig. 3. Selected results for a heap-leach facility with a surface treatment to limit fluid flux into the top of the heap when the Keren-type isotherm for As sorption was used.

 

Figure 4
Figure 4
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  		Fig. 4. Selected results for a heap-leach facility with a cover to limit fluid and gas fluxes into the top of the heap. Arsenic sorption is described using the Sips-type isotherm.

 

Figure 5
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  		Fig. 5. Time series of aqueous As concentrations at the lower boundary discharge point for all examples and both isotherm types.

 

Figure 6
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  		Fig. 6. Time series of cumulative aqueous As mass at the lower boundary discharge point for the three examples using the Sips-type isotherm.

 




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