Removal of Chloro Derivatives of Ethene from Ground Water with Granulated-Iron Reaction Barriers

Autoři

  • M. Jiříček Department of Water Technology and Environmental Engineering, Institute of Chemical Technology, Prague,
  • O. Šráček Institute of Geological Sciences, Faculty of Science, Masaryk University, Brno
  • V. Janda Department of Water Technology and Environmental Engineering, Institute of Chemical Technology, Prague,

Abstrakt

Reduction of chlorinated ethenes with iron metal was studied in pilot-plant tests. The test showed a sufficient ability of the iron material to reduce a mixture of tetrachloroethene and trichloroethene. The reactions were well approximated by the first-order kinetics. The rate constants per surface area were 0.22 ± 0.11 and 0.44 ± 0.09 mL m−2 L−1, respectively. Significant changes of Ca, total Fe, HCO3, and NO3 concentrations were found in the reaction zone. Speciation calculations indicated aragonite and siderite as possible precipitating minerals. The change in HCO3 concentration in the reaction zone was gradual and could be approximated by zeroth-order reaction kinetics with the rate constant value 0.096 mol L−1 h−1. The surface precipitate may influence the operating life of a permeable reactive barrier as a consequence of permeability decrease and coating of iron.

Publikováno

15.03.2007

Jak citovat

Jiříček, M., Šráček, O., & Janda, V. (2007). Removal of Chloro Derivatives of Ethene from Ground Water with Granulated-Iron Reaction Barriers. Chemické Listy, 101(2). Získáno z http://www.chemicke-listy.cz/ojs3/index.php/chemicke-listy/article/view/1831

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