A Study on Treatment of Soils Contaminated by Diesel and Kerosene Using Hydrogen Peroxide Catalyzed by Naturally Occurring Iron Minerals

디젤과 등유로 오염된 토양의 철광석으로 촉매화된 과수를 이용한 처리에 관한 연구

  • Choi, Jin-Ho (Hanwha group R&E Center) ;
  • Kim, Sang-Dae (Department of Chemical Engineering, Hanyang University) ;
  • Moon, Sei-Ki (Department of Chemical Engineering, Hanyang University) ;
  • Kong, Sung-Ho (Department of Chemical Engineering, Hanyang University)
  • 최진호 (한화그룹 종합연구소 환경연구센터) ;
  • 김상대 (한양대학교 공과대학 화학공학과) ;
  • 문세기 (한양대학교 공과대학 화학공학과) ;
  • 공성호 (한양대학교 공과대학 화학공학과)
  • Received : 1998.03.05
  • Accepted : 1998.10.09
  • Published : 1999.02.10

Abstract

Naturally-occurring iron minerals, goethite, magnetite, and hydrogen peroxide were used to catalyze and initiate Fenton-like oxidation of silica sand contaminated with mixture of diesel and kerosene in batch system. Optimal reaction conditions were investigated by varying pH(3, 7), $H_2O_2$ concentration(0%, 1%, 7%, 15%, 35%), initial contaminant concentration(0.2, 0.5, 1.0 g-mixture of diesel and kerosene/ kg-soil), and iron mineral contents(1, 5, and 10 wt % magnetite or goethite). Contaminant degradations in silica sand-iron mineral-$H_2O_2$ systems were identified by determining total petroleum hydrocarbon(TPH) concentration. The optimal pH of the system was 3. The system which iron minerals were the only iron source was more efficient than the system with $FeSO_4$ solution due to lower $H_2O_2$ consumption. In case of initial contaminant concentration of 1g-contaminant/kg-soil with 5 wt % magnetite, addition of 0%, 1%, 7%, 15%, and 35% of $H_2O_2$ showed 0%, 24.5%, 44%, 52%, and 70% of TPH reduction in 8 days, respectively. When the mineral contents were varied 0, 1, 5, and 10wt%, removal of contaminants were 0%, 33.5%, 50%, and 60% for magnetite and 0%, 29%, 41%, and 53% for goethite, respectively. Reaction of magnetite system showed higher degradation than that of goethite system due to dissolution of iron and mixed presence of iron(II) and iron(III); however, dissolved iron precipitated on the surface of iron mineral and seemed to cause reducing electron transfer activity on the surface and quenching $H_2O_2$. The system using goethite has better treatment efficiency due to less $H_2O_2$ consumption. When cach system was mixed by shaker, removal of contaminants increased by 41% for magnetite and 30% for goethite. Results of this study showed catalyzed $H_2O_2$ system made in-situ treatment of soil contaminated with petroleum possible without addition of iron source since natural soils generally contain iron minerals such as magnetite and goethite.

Acknowledgement

Supported by : 한양대학교

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