Remediation of ground water containing chlorinated and brominated hydrocarbons, benzene and chromate by sequential treatment using ZVI and GAC.

Plagentz, V., Ebert, M. and Dahmke, A. (2006) Remediation of ground water containing chlorinated and brominated hydrocarbons, benzene and chromate by sequential treatment using ZVI and GAC. Environmental Geology, 49 (5). pp. 684-695. DOI 10.1007/s00254-005-0106-z.

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Abstract

A laboratory experiment with two sequenced columns was performed as a preliminary study for the installation of a permeable reactive barrier (PRB) at a site where a mixed ground water contamination exists. The first column contained granular zero valent iron (ZVI), the second column was filled with granular activated carbon (GAC). Trichloromethane (TCM, 930 mu g/l) and chlorobenzene (MCB, 260 mu g/l) were added to the ground water from the site as the main contaminants. Smaller amounts ( < 60 mu g/l) of benzene, 1,2- dichloroethane, 1,1,2-trichloroethane (1,1,2-TCA), 1,1-dichloroethene (1,1-DCE), trichloroethene (TCE), tetrachloroethene (PCE), 1,2-dichloropropane (1,2-DCP), bromodichloromethane (BDCM), dibromochloromethane (DBCM), tribromomethane (TBM), vinyl chloride and chromate were also added to the water to simulate the complex contamination pattern at the site of interest. PCE, TCE, 1,1-DCE, DBCM, BDCM, TBM, MCB and chromate were remediated in contact with ZVI, while the remaining contaminants showed incomplete degradation. A fraction of 8-16.5% TCM was converted to dichloromethane (DCM). Remaining contaminant concentrations were efficiently sorbed by the GAC until breakthrough of DCM was observed after 1,230 exchanged pore volumes in the GAC. The results show that the complex mixture of contaminants can be remediated by a sequenced PRB consisting of ZVI and GAC and that DCM sorption capacity is the critical parameter for the dimensions of the GAC reactor.

Document Type: Article
Keywords: sequenced permeable reactive barriers zero valent iron granular activated carbon halogenated hydrocarbons benzene chromate zero-valent iron degradation dehalogenation kinetics tce
Research affiliation: Kiel University
Refereed: No
DOI etc.: 10.1007/s00254-005-0106-z
ISSN: 0943-0105
Date Deposited: 12 Jan 2012 05:46
Last Modified: 23 Sep 2019 16:58
URI: http://oceanrep.geomar.de/id/eprint/16015

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