한국지하수토양환경학회지:지하수토양환경 (Journal of Soil and Groundwater Environment)

  • 제16권1호
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  • Pages.82-90
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  • 2011
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  • 1598-6438(pISSN)
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  • 2287-8831(eISSN)
한국지하수토양환경학회 (Korean Society of Soil and Groundwater Environment)
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시멘트/Fe(II) 및 hematite/Fe(II) 시스템의 TCE 분해반응 시 Ca 성분의 영향

Effects of Calcium on TCE Degradation Reaction in Cement/Fe(II) and Hematite/Fe(II) Systems

  • 김홍석 (부산대학교 사회환경시스템공학부) ;
  • 황경엽 (부산대학교 사회환경시스템공학부) ;
  • 안준영 (부산대학교 사회환경시스템공학부) ;
  • 이주영 (부산광역시 서구청 환경위생과) ;
  • 황인성 (부산대학교 사회환경시스템공학부)
  • Kim, Hong-Seok (School of Civil & Environmental Engineering, Pusan National University) ;
  • Hwang, Kyung-Yup (School of Civil & Environmental Engineering, Pusan National University) ;
  • Ahn, Jun-Young (School of Civil & Environmental Engineering, Pusan National University) ;
  • Yi, Jou-Young (Environment and Sanitation Division, Seogu Office, Busan Metropolitan City) ;
  • Hwang, In-Seong (School of Civil & Environmental Engineering, Pusan National University)
  • 투고 : 2011.01.06
  • 심사 : 2011.02.25
  • 발행 : 2011.02.28
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초록

Reactive reductants of cement/Fe(II) systems in dechlorinating chlorinated hydrocarbons have not been identified. The previous studies showed that a hematite/CaO/Fe(II) system had TCE degradation characteristics similar to those of cement/Fe(II) systems with regard to degradation kinetics and that lime (CaO) plays an important role in enhancing the reactivity for TCE dechlorination. The current study shows identified the formation of gypsum ($CaSO_4$) in the hematite/CaO/$FeSO_4$ system through the XRD analysis. The amounts of the gypsum increased with increment of the initial CaO dose. However, when CaO in the hematite/CaO/$FeSO_4$ system was replaced with gypsum, TCE degradation was not observed. Ca-removed Portland cement extracts (CPCX) in combination with $FeSO_4(CPCX/FeSO_4)$ showed no TCE degradation. On the other hands, the Portland cement extracts (PCX) in the presence of $FeSO_4(PCX/FeSO_4)$ and CPCX/CaO/$FeSO_4$ systems degraded 0.2 mM TCE within 5 days, indicating that CaO also played an important role dechlorination reactions in the systems. The pseudo-first-order rate constants (k) of the CPCX/CaO/$FeSO_4$ systems were 0.20, 0.24, and 0.72 $day^{-1}$, when the CaO dosages were 25, 50 and 75 g/L, respectively. The XRD analyses showed identified the common peaks having the d-values of 3.02, 2.27, and 1.87 in the reaction systems that showed TCE degradation. However, it was not possible to clearly identify the crystalline minerals having the three peaks from the references in JCPDS cards. This study reveals that the reactive agents in the cement/Fe(II) and the hematite/Fe(II) systems are likely to be those containing CaO and Fe(II).

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참고문헌

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