• Investigation of Seasonal Characteristics of Contaminants and Hydrochemical Factors in an Aquifer for Application of In Situ Reactive Zone Technology
  • Ahn, Jun-Young;Kim, Cheolyong;Kim, Tae Yoo;Jun, Seong-Chun;Hwang, Inseong;
  • Department of Civil & Environmental Engineering, Pusan National University;Department of Civil & Environmental Engineering, Pusan National University;Department of Civil & Environmental Engineering, Pusan National University;GeoGreen21 Co., Ltd.;Department of Civil & Environmental Engineering, Pusan National University;
  • 원위치 반응존 공법 적용을 위한 대수층내 오염물질 및 환경영향인자의 계절 특성 평가
  • 안준영;김철용;김태유;전성천;황인성;
  • 부산대학교 사회환경시스템공학과;부산대학교 사회환경시스템공학과;부산대학교 사회환경시스템공학과;(주)지오그린21;부산대학교 사회환경시스템공학과;
Abstract
A field investigation was conducted on an aquifer contaminated with trichloroethylene (TCE) for application of in situ reactive zone treatment using nanosized zero-valent iron (NZVI). The aquifer was an unconfined aquifer with a mean hydraulic conductivity of $5.14{\times}10^{-4}cm/sec$, which would be favorable for NZVI injection. Seasonal monitoring of TCE concentration revealed a presence of non-aqueous phase liquid form of TCE near IW (injection well). The hydrochemical data characterized the site groundwater to be a $Ca-HCO_3$ type. The average value of Langelier Saturation Index of the groundwater was -1.33, which implied that the site was favorable for corrosion of NZVI. Dissolved oxygen (DO) concentration varied between 2.5~11.5 mg/L, which indicated that DO would greatly compete with TCE as an electron acceptor. The hydrogeological and hydrochemical characterization reveals that the time around November would be appropriate for NZVI injection when water level and temperature are relatively high and DO concentration is low.

Keywords: Nanoscale zero-valent iron;field study;DNAPL;Trichloroethylene;Contaminant distribution;

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