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2007 | 5 | 1 | 87-106
Tytuł artykułu

Removal of chlorinated solvents from carbonate-buffered water by zero-valent iron

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The performance of a ground level reactive cell, filled with Fe0, designed for the treatment of water contaminated by chlorinated solvents, having a total input concentration of approximately 2 mg 1−1 of the principal contaminants trichloroethene and perchloroethene, was tested at the Milovice site in the Czech Republic. A residence time of 1.62 days in the box was sufficient to reduce concentrations to a fraction less than 0.015 of the initial concentration. However, incomplete degradation of cis-1,2-DCE was observed. Reactions approximated first-order kinetics. The principal changes of concentrations of inorganic dissolved species in the reactive cell occurred for Ca2+, HCO 3−, NO 3− (decreased) and for Fe (initially increased, then decreased). Changes for Ca2+ and HCO 3− were caused by the precipitation of secondary carbonate mineral phases such as aragonite and siderite with the minor presence of green rust-CO3. Concentration changes were gradual, along the complete length of the cell with a maximum at the inlet zone. The observations were attributed to minor increases of pH and slow kinetics of precipitation in the carbonate-buffered system. The average porosity loss was estimated to be approximately 2.7 % of the initial porosity per year, suggesting the long-term function of the permeable reactive barrier. [...]
Wydawca
Czasopismo
Rocznik
Tom
5
Numer
1
Strony
87-106
Opis fizyczny
Daty
wydano
2007-03-01
online
2007-03-01
Twórcy
autor
autor
  • Department of Water Technology and Environmental Engineering, Institute of Chemical Technology, 166 28, Prague 6, Czech Republic , jandav@vscht.cz
Bibliografia
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  • [3] R.T. Wilkin, R.W. Puls and G.W. Sewell: “Long-Term Performance of Permeable Reactive Barriers Using Zero-Valent Iron, Geochemical and Microbiological Effects”, Groundwater Vol. 41, (2003), pp. 493–503.
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  • [20] Batelle: Performance Evaluation of a Pilot-Scale Permeable Reactive Barrier at Former Naval Air Station Moffett Field, Mountain View, California, Prepared for Naval Facilities Engineering Service Center, Port Hueneme, Ca., November 20, 1998, http://clu/in.org/products/tins/display.cfm?id=824993.
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  • [22] G. Bourrié, F. Trolard, J. Génin, A. Jaffrezic, V. Maitre and M. Abdelmoula: “Iron Control by Equilibria between Hydroxy-Green Rusts and Solutions in Hydromorphic Soils”, Geochim. Cosmochim. Acta, Vol. 63, (1998), pp. 3417–3427. http://dx.doi.org/10.1016/S0016-7037(99)00262-8[Crossref]
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  • [24] K.U. Mayer, D.W. Blowes and E.O. Frind: “Reactive Transport Modeling of an In-Situ Reactive Barrier for the Treatment of Hexavalent Chromium and Trichlorethylene in Groundwater”, Water Res., Vol. 37, (2001), pp. 3091–3103. http://dx.doi.org/10.1029/2001WR000234[Crossref]
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11532-006-0071-8
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