Dynamic and equilibrium studies of the RDX removal from soil using CMC-coated zerovalent iron nanoparticles

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DOIResolve DOI: http://doi.org/10.1016/j.envpol.2009.03.019
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TypeArticle
Journal titleEnvironmental Pollution
Volume157
Issue8-9
Pages24052412; # of pages: 8
Subjectnanoiron; RDX-contaminated soil; dynamic study; flow-through short column
AbstractRapid chemical degradation of toxic RDX explosive in soil can be accomplished using zerovalent nanoiron suspension stabilized in dilute carboxymethyl cellulose solution (CMC-ZVINs). The effect of operating conditions (redox-potential, Fe/RDX molar ratio) was studied on batchwise removal of RDX in contaminated soil. While anaerobic conditions resulted in 98% RDX removal in 3 h, only slightly over 60% RDX removal could be attained under aerobic conditions. The molar ratio did not have any influence on the intermediate and final RDX degradation products (methylenedinitramine, nitroso derivative, N₂, N₂O, NO₂−), however, their distribution changed. Dynamic studies were conducted using a flow-through short column packed with RDX-contaminated soil and fed with CMC-ZVINs. The column was operated at two interstitial velocities (2.2 and 1.6 cm min⁻¹), resulting in the 76.6% and 95% removal of the initial RDX soil contamination load (60 mg kg⁻¹), respectively. While the column operating conditions could be further optimized, 95% of the RDX initially present in the contaminated soil packed in the column was degraded when flushed with a CMC-ZVINs suspension in this work.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Biotechnology Research Institute
Peer reviewedNo
NRC number49960
NPARC number12429642
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Record identifier82a64274-8c8e-41d3-96ad-dc2094b6ba41
Record created2009-10-26
Record modified2016-05-09
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