Effect of Recycled-Water Addition on Treatment Efficiency of Coal Tar-Contaminated Soil with Slurry Phase Bioreactor

콜타르 오염토양의 슬러리상 생물반응기에서 처리수 재순환에 따른 효율 평가

  • Park, Joon-Seok (Department of Environmental Engineering, Samcheok National University) ;
  • Park, Jin-Hong (Korea Testing Laboratory) ;
  • Namkoong, Wan (Konkuk University Innovative Environmental Technology Center)
  • 박준석 (삼척대학교 환경공학과) ;
  • 박진홍 (산업기술시험원) ;
  • 남궁완 (건국대학교 차세대환경기술센터)
  • Received : 2005.08.25
  • Accepted : 2005.09.05
  • Published : 2005.10.10

Abstract

This research was conducted to evaluate the effect of recycled-water addition on the treatment of coar tar-contaminated soil with slurry phase bioreactor. A bench-scale slurry phase bioreactor was maintained to optimize the microbial growth. Silty loam soil was used for this research. Concentrations of coal tar and 14 target PAHs (Polyunclear Aromatic Hydrocarbons) in the soil were determined with gas chromatography. Addition of recycled-water to slurry phase bioreactor was not significantly increased the removal efficiency of 2000 mg coar tar/kg. However, it significantly increased the removal efficiency of 20000 mg coar tar/kg. In 20000 mg coar tar/kg, the first order kinetic constant and the removal efficiency of the reactor with recycled-water addition were 2.5 and 2.0 times higher than those of the reactor without recycled- water addition. Coar tar in the slurry phase bioreactor was removed in 3.8~16.0% by vaporization and biodegraded in 84.0~96.2%. Removal efficiency of 3-ring compounds was high as 92.2~99.7% in the case of recycled-water addition. However, removal efficiencies of 3 and 4-ring compounds were low as 0~30%.

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