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http://dx.doi.org/10.7857/JSGE.2011.16.1.082

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

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)
Publication Information
Journal of Soil and Groundwater Environment / v.16, no.1, 2011 , pp. 82-90 More about this Journal
Abstract
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).
Keywords
Cement; Hematite; Fe(II); CaO; TCE; Reductive dechlorination;
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1 Butler, E.C. and Kim, F.H., 2001, Factors influencing rates and products in the transformation of trichloroethylene by iron sulfide and iron metal, Environ. Sci. Technol., 35, 3884-3891.   DOI   ScienceOn
2 Casanova, P.L., Cwiertny, D.M., and Scherer, M.M., 2010, Nanogoethote formation from oxidation of Fe(II) sorbed on aluminum reduction. Environ. Sci. Technol., 44, 3765-3771.   DOI   ScienceOn
3 Kim, S.D., Park, K.S., and Gu., M.B., 2002, Toxicity of hexavalent chromium to daphnia magma: influence of reduction reaction by ferrous iron, J. Hazard. Mater., A93, 155-164.   DOI   ScienceOn
4 Taylor, H.F.W., 1997, Cement chemistry 2nd ed., Thomas, London, England.
5 Hwang, I. and Batchelor, B., 2000, Reductive dechlorination of tetrachloro- ethylene by Fe(II) in cement slurries, Environ. Sci. Technol., 34, 5017-5022.   DOI   ScienceOn
6 Kang, W.H., 2006, Reductive dechlorination of chlorinated ethylenes using cement and steel slag amended with Fe(II), Ph.D. Dissertation, Hanyang University, Seoul, Korea, p. 186.
7 Hwang, I. and Batchelor, B., 2001, Reductive dechlorination of tetrachloroethylene in soils by Fe(II) based degradative solidification/stabilization, Environ. Sci. Technol., 35, 3792-3797.   DOI   ScienceOn
8 Hawang, I. and Batchelor, B., 2002, Reductive dechlorination of chlorinated methanes in cement slurries containing Fe(II), Chemosphere, 48(10), 1019-1027.   DOI   ScienceOn
9 Hwang, I., Batchelor, B., Schlautman, M.A., and Wang, R., 2002, Effects of ferrous iron and molecular oxygen on chromium(IV) redox kinetics in the presence of aquifer solids, J. Hazard. Mater., 92(2), 143-159.   DOI   ScienceOn
10 Charlet, L., Silvester, E., and Liger, E., 1998, N-compound reduction and actinide immobilization in surficial fluid by Fe(II): the surface$\equiv$FeIIIOFeIIOH0 species, as major reductant, Chemical Geology, 151, 85-93.   DOI
11 Elsner, M., Schwarzenbach, R., and Haderlein, S., 2004, Reactivity of Fe(II)-bearing minerals toward reductive transformation of organic contaminants, Environ. Sci. Technol., 38, 799-807.   DOI   ScienceOn
12 Kim, H.S., Kang, W.H., Kim, M, Park, J.Y., and Hwang, I., 2008, Comparison of Hematite/Fe(II) Systems with Cement/Fe(II) Systems in Reductively Dechlorinating Trichloroethylene, Chemosphere, 73, 813-816.   DOI   ScienceOn
13 김정배, 2000, 황화철을 이용한 할로겐 화합물의 탈염소화 반응에 관한 연구, J. Nakdongkang Environ. Res. Institute, 5(1), 19-31.
14 Ko, S., 2005, Identification of active agents for tetrachloroethylene degradation in Portland cement slurry containing ferrous iron, Ph.D. Dissertation, Texas A&M University.
15 Ko, S. and Batchelor, B., 2007, Identification of active agents for tetrachloroethylene degradation in portland cement slurry containing ferrous iron. Environ. Sci. Technol., 41, 5824-5832.   DOI   ScienceOn
16 Handler, R.M., Beard, B.L., Johnson, C.M., and Scherer, M.M., 2009, Atom exchange between aqueous Fe(II) and goethite : An Fe isotope tracer study, Environ. Sci. Technol., 43, 1102-1107.   DOI   ScienceOn
17 환경부, 2008, 2007 전국 지하수 수질측정망 운영결과.
18 환경부, 1998, 유해폐기물의 안정화/고형화 처리기술.