Parbs, A., Ebert, M. and Dahmke, A. (2007) Long-term effects of dissolved carbonate species on the degradation of trichloroethylene by zerovalent iron. Environ Sci Technol, 41 (1). pp. 291-6.

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Abstract

The effect of different concentrations of total inorganic carbon (TIC) and flow rates on the reactivity of iron metal with trichloroethylene (TCE) was studied in column experiments to verify whether concentration or mass flux of TIC is the major key parameter for barrier performance. First-order rate coefficients (kobs) for TCE degradation vary initially between 0.15 and 0.32 h-' and are positively related to TIC influent concentration. Maximal kobs were reached after 164 and 591 PV, varied between 0.55 and 1.1 h(-1), and were positively correlated to the TIC mass flux, followed by a decrease resulting in values similar to the reference system at the end of the experiments. Enhancement of iron corrosion (0.7 to 3.5 mmol kgFe(-1) d(-1) and formation of gas bubbles during the initial experimental phase were observed and were also positively correlated to TIC mass flux. The higher gas bubble formation probably has a more significant effect on porosity than mineral precipitations in Fe0-systems. The results suggest that higher TIC mass fluxes cause a more pronounced acceleration in CHC degradation, but also a faster inhibition in the longer-term. This faster inhibition has serious implication for the design of funnel and gate systems.

Document Type:	Article
Additional Information:	Parbs, Anika Ebert, Markus Dahmke, Andreas Comparative Study Research Support, Non-U.S. Gov't United States Environmental science & technology Environ Sci Technol. 2007 Jan 1;41(1):291-6.
Keywords:	Carbonates/*chemistry Iron/*chemistry Kinetics Trichloroethylene/*chemistry Water Pollution/*prevention & control
Research affiliation:	Kiel University
Refereed:	No
Date Deposited:	02 Feb 2012 08:14
Last Modified:	09 Oct 2012 03:56
URI:	https://oceanrep.geomar.de/id/eprint/15938

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