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http://dx.doi.org/10.4491/KSEE.2011.33.10.723

The Effects of Reaction Conditions and NOM on Persulfate Oxidation of RDX  

Wu, Dabo (Environmental Business Division, H-Plus Eco Ltd.)
Bae, Bum-Han (Department of Civil & Environmental Engineering, Kyungwon University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.33, no.10, 2011 , pp. 723-730 More about this Journal
Abstract
In this experiment, persulfate, a strong oxidant for ISCO (In-Situ Chemical Oxidation) was used to degraded RDX in artificial ground water at ambient temperature. Results of RDX degradation by persulfate in a batch reactor showed that the oxidation reaction was pseudo first order with estimated Ea (activation energy) of $1.14{\times}10^2kJ/mol$ and the rate was increased with the increase of reaction temperature. The oxidation of RDX by persulfate increased slightly with the increase of initial solution pH from 4 to 8. The RDX oxidation rate increased 13 times at pH 10 compared with that at pH 4, however, alkaline hydrolysis was found to be the main reaction of RDX degradation rather than oxidation. The study also showed that the oxidation rate of RDX by persulfate was linearly dependent upon the molar ratios of persulfate to RDX from 5 : 1 up to 100 : 1, with a proportion constant of $4{\times}10^{-4}$ ($min^{-1}$/molar ratio) at $70^{\circ}C$. While NOM (Natural Organic Matter) exerted negative effects on the oxidation rate of RDX by persulfate, with a proportion constant of $1.21{\times}10^{-4}$ ($min^{-1}{\cdot}L/mg-NOM$) at $70^{\circ}C$ and persulfate/NOM molar ratio of 10/1. The decrease in RDX oxidation rate was linearly dependent upon the added NOM concentration. However, the estimated activation energy in the presence of 20 mg-NOM/L was within 3.3% error compared to that without NOM, which implies the addition of NOM does not alter intrinsic oxidation reaction.
Keywords
In-Situ Chemical Oxidation (ISCO); NOM (Natural Organic Matter); Sulfate Radical; Persulfate; RDX;
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Times Cited By KSCI : 1  (Citation Analysis)
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