Publication details

Natural attenuation of chlorinated solvents: a comparative study



Year of publication 2007
Type Article in Periodical
Magazine / Source Environmental Geology
MU Faculty or unit

Faculty of Science

Field Geochemistry
Keywords Chlorinated solvents Natural attenuation Reductive dechlorination Biodegradation rate constant Steady-state plume
Description 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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