Natural attenuation of chlorinated solvents: a comparative study |
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| Authors: | Tomas Kuchovsky Ondra Sracek |
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| Institution: | (1) Institute of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic |
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| Abstract: | Sites contaminated by chlorinated solvents have been investigated. Sites Dolni Tresnovec and Zetor located in Czech Republic
exhibit relatively reducing conditions. Primary chlorinated solvents are attenuated by reductive dechlorination processes,
and plumes have probably reached steady-state at Zetor site. Terminal electron accepting processes (TEAP) are ferric iron
reduction and sulfate reduction at respective Dolni Tresnovec and Zetor sites. Source of organic matter at Dolni Tresnovec
site is the waste deposited at local landfill. At Zetor site reducing conditions are linked to the petroleum hydrocarbons
spill from broken pipeline. In contrast, site Dubnica in Slovak Republic exhibits oxidizing conditions, and natural attenuation
of chlorinated solvents occurs mostly by dispersion. Modeling by the program BIOCHLOR indicated formation of steady-state
plumes close to source at Zetor site, much longer steady-state plumes at Dolni Tresnovec site, and extremely long plumes at
Dubnica site. Results demonstrate an important role of redox conditions in natural attenuation of chlorinated solvents. |
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| Keywords: | Chlorinated solvents Natural attenuation Reductive dechlorination biodegradation rate constant Steady-state plume |
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