• Field Study on Application of Reactive Zone Technology Using Zero-Valent Iron Nanoparticles for Remediation of TCE-Contaminated Groundwater
  • Ahn, Jun-Young;Kim, Cheolyong;Hwang, Kyung-Yup;Jun, Seong-Chun;Hwang, Inseong;
  • school of Civil & Environmental Engineering, Pusan National University;School of Civil & Environmental Engineering, Pusan National University;School of Civil & Environmental Engineering, Pusan National University;GeoGreen21 Co., Ltd.;School of Civil & Environmental Engineering, Pusan National University;
  • TCE 오염 지하수의 정화를 위한 나노영가철 기반 반응존 공법의 현장 적용성 연구
  • 안준영;김철용;황경엽;전성천;황인성;
  • 부산대학교 사회환경시스템공학부;부산대학교 사회환경시스템공학부;부산대학교 사회환경시스템공학부;(주)지오그린21;부산대학교 사회환경시스템공학부;
Abstract
The laboratory and field studies were conducted to identify an optimal injection concentration of nanoscale zero-valent iron particles (NZVI) and to evaluate the applicability of NZVI-based reactive zone technology to the site contaminated with trichloroethylene (TCE) DNAPL (Dense Non-Aqueous Phase Liquid). The laboratory test found an optimal injection concentration of NZVI of 5 g/L that could remove more than 95% of 0.15 mM TCE within 20 days. Eleven test wells were installed at the aquifer that was mainly composed of alluvial and weathered soils at a strong oxic condition with dissolved oxygen concentration of 3.50 mg/L and oxidation-reduction potential of 301 mV. NZVI of total 30 kg were successfully injected using a centrifugal pump. After 60 days from the NZVI injection, 86.2% of the TCE initially present in the groundwater was removed and the mass of TCE removed was 405 g. Nonchlorinated products such as ethane and ethene were detected in the groundwater samples. Based on the increased chloride ion concentration at the site, the mass of TCE removed was estimated to be 1.52 kg. This implied the presence of DNAPL TCE which contributed to a higher estimate of TCE removal than that based on the TCE concentration change.

Keywords: Nanoscale zero-valent iron;In situ chemical reduction;DNAPL;Groundwater remediation;Trichloroethylene;

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This Article

  • 2014; 19(6): 80-90

    Published on Dec 31, 2014

  • 10.7857/JSGE.2014.19.6.080
  • Received on Nov 26, 2014
  • Revised on Dec 26, 2014
  • Accepted on Dec 27, 2014