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Pilot-Scale Treatment of RDX-Contaminated Soil with Zerovalent Iron

S. D. Comforta, P. J. Shea*,a, T. A. Machaceka and T. Satapanajarub

a School of Natural Resources, University of Nebraska-Lincoln, 362 Plant Sciences, Lincoln, NE 68583-0915
b Department of Environmental Science, Kasetsart University, Bangkok, Thailand 10900



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  		Fig. 1. Photographs of Microenfractionators. (A) Pilot-scale table-top unit (one-sixth scale of the field unit). (B) Field-scale Microenfractionator going through soil windrow; dimensions of the windrow are: base = 5.2 m, height = 1.98 m.

 


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  		Fig. 2. Comparison of RDX destruction rates at constant pH 4.5 using HCl and CH3COOH. Fisher Scientific Fe0 was used at a rate of 1% (w/v). Aqueous soil washing was prepared from Soil A by creating a 20% (w/v) soil slurry, removing the soil, and treating the supernatant. Soil extract C0 = approximately 40 mg RDX L-1; pure solution C0 = approximately 20 mg RDX L-1.

 


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  		Fig. 3. RDX destruction by Fe0 treatments in an aqueous matrix and humic acid (50 mg L-1) matrix. Witherite and CH3COOH were added to the matrices as indicated treatments in Cycles 1 and 2 but not in Cycle 3.

 




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