Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Oxygen Release from Peroxide Injected into Soil/Sediment

토양/퇴적물에 주입한 과산화물에서 발생되는 산소 배출

  • Han, Kyungmin (Department of Civil and Environmental Engineering, Hannam University) ;
  • Kim, Geonha (Department of Civil and Environmental Engineering, Hannam University)
  • 한경민 (한남대학교 건설시스템공학과) ;
  • 김건하 (한남대학교 건설시스템공학과)
  • Received : 2009.11.02
  • Accepted : 2009.12.12
  • Published : 2010.01.30
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Abstract

Peroxide is used frequently to provide electron acceptors to aerobes for the purpose of in situ bioremediation of contaminated soil/sediment. In this study, oxygen release rate of peroxides and factors affecting on dissolution and diffusion of oxygen into pore water were evaluated. Peroxides studied in this study were magnesium peroxide ($MgO_2$), calcium peroxide ($CaO_2$), and sodium percarbonate ($Na_2CO_3{\cdot}1.5H_2O_2$). $Na_2CO_3{\cdot}1.5H_2O_2$ showed the highest oxygen release rate per unit mass and the shortest release duration time among three peroxides. A simple first-order decay model for predicting the release rate of oxygen from peroxide into pore water was presented and used to fit the experimental data. The first order oxygen release rate constants k for $MgO_2$, $CaO_2$ and $Na_2CO_3{\cdot}1.5H_2O_2$ were 0.45 /hr, 3.22 /hr and 134 /hr, respectively. If $MgO_2$ was mixed with clay, oxygen release rate was lowered significantly mainly due to limitation of contact area and diffusion, implying that oxygen can be provided to the indigenous aerobes for the extended period of time.

Keywords

References

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