Interaction between abiotic and biotic reactions on reductive dechlorination of chlorinated organics무생물/생물학적 상호작용에 의한 염소계 유기화합물의 환원적 탈염화 연구

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Roles of geo-biochemical interactions on reductive degradation of chlorinated organics were investigated in this Ph. D. dissertation to provide better understanding of contaminant fate in sub-surface environment. Especially, effect of interactions on the degradation of chlorinated organics was investigated using nano-sized zero-valent iron (nZVI), reactive iron-bearing soil minerals (IBSMs), iron reducing bacteria (IRB), and electron transfer mediators (ETMs). The reductive degradation of 1,1,1-trichloethane (1,1,1-TCA) by interaction of nZVI and magnetite (FeII1III2O4) was investigated as the nZVI/IBSMs/contaminant interaction. A remarkable reductive degradation of 1,1,1-TCA (0.289 hr-1) was observed in nZVI (0.01 g/24 mL) suspension in 5 h, while the degradation was not significant in nZVI (0.01 g)/magnetite (0.5 g) suspension in 80 h. This indicated that magnetite can inhibit the reactivity of nZVI for 1,1,1-TCA degradation. No significant difference in the inhibition of nZVI reactivity by magnetite was observed in the pH range of 6 to 9. The result of X-ray photoelectron spectroscopy revealed that magnetite surface was reduced by an electron transfer from nZVI. The results showed that electrons from nZVI were used for the reduction of magnetite surface rather than the reduction of 1,1,1-TCA, leading to the decrease of 1,1,1-TCA degradation in this study. The effect of ETMs on biotransformation of lepidocrocite (γ-FeIIIOOH) by Shewanella putrefaciens CN32 (CN32) was investigated as the IRB/IBSMs/ETMs interaction. In PIPES buffer without phosphate, green rust ([Fe4IIFe2III(OH)12][A2- o 6H2O]) formation was observed with fast Fe(II) production rate (0.44-0.56 mM d-1) during the bioreduction of lepidocrocite with exogenous ETMs (quinones). In contrast, goethite (α-FeIIIOOH) formed at slow Fe(II) production rate (0.24-0.29 mM d-1) with endogenous ETMs (flavins). In the presence of phosphate, formation of green rust and vivianite (FeII3(PO4)2o8H2O) was observe...
Advisors
Lee, Woo-Jinresearcher이우진
Description
한국과학기술원 : 건설및환경공학과,
Publisher
한국과학기술원
Issue Date
2013
Identifier
513441/325007  / 020097042
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 건설및환경공학과, 2013.2, [ xiv, 186 p. ]

Keywords

nZVI; iron-bearing soil minerals; Shewanella putrefaciens CN32; electron transfer mediators; 나노 영가철; 철 함유 토양광물; Shewanella putrefaciens CN32; 전자전달체; 염소계 유기화합물; chlorinated organic compounds

URI
http://hdl.handle.net/10203/180016
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=513441&flag=dissertation
Appears in Collection
CE-Theses_Ph.D.(박사논문)
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