• Evaluation of Nanoscale Zero-valent Iron for Reductive Degradation of Hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX): Batch and Column Scale Studies
  • Lee, Chung-Seop;Oh, Da-Som;Cho, Sung-Heui;Lee, Jin-Wook;Chang, Yoon-Seok;
  • School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH);School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH);Hyorim Industries Inc.;GS E&C;School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH);
  • Hexahydro-1,3,5-trinitro-1,3,5-triazine(RDX)의 환원적 분해를 위한나노영가철의 성능평가: 회분식 및 칼럼 실험
  • 이충섭;오다솜;조성희;이진욱;장윤석;
  • 포항공과대학교 환경공학부;포항공과대학교 환경공학부;효림산업(주);GS E&C 환경해외사업부;포항공과대학교 환경공학부;
Abstract
Reductive degradation of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) by nanoscale zero-valent iron (nZVI) was investigated to evaluate the feasibility of using it for in-situ groundwater remediation. Batch experiments were conducted to quantify the kinetics and efficiency of RDX removal by nZVI, and to determine the effects of pH, dissolved oxygen (DO), and ionic strength on this process. Experimental results showed that the reduction of RDX by nZVI followed pseudo-first order kinetics with the observed rate constant (kobs) in the range of 0.0056-0.0192 min−1. Column tests were conducted to quantify the removal of RDX by nZVI under real groundwater conditions and evaluate the potential efficacy of nZVI for this purpose in real conditions. In column experiment, RDX removal capacity of nZVI was determined to be 82,500 mg/kg nZVI. pH, oxidation-reduction potential (ORP), and DO concentration varied significantly during the column experiments; the occurrence of these changes suggests that monitoring these quantities may be useful in evaluation of the reactivity of nZVI, because the most critical mechanisms for RDX removal are based on the chemical reduction reactions. These results revealed that nZVI can significantly degrade RDX and that use of nZVI could be an effective method for in-situ remediation of RDX-contaminated groundwater.

Keywords: Nanoscale Zero-Valent Iron;RDX;Column;Groundwater;Reduction;

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This Article

  • 2015; 20(6): 117-126

    Published on Nov 30, 2015

  • 10.7857/JSGE.2015.20.6.117
  • Received on Oct 2, 2015
  • Revised on Nov 13, 2015
  • Accepted on Nov 27, 2015