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COMBINED CHEMICAL AND MICROBIOLOGICAL DEGRADATION OF TETRACHLOROETHENE DURING THE APPLICATION OF CARBO-IRON AT A CONTAMINATED FIELD SITE
Vogel, M., I. Nijenhuis, J. Lloyd, C. Boothman, M. Poeritz, and K. Mackenzie.
Science of the Total Environment 628-629:1027-1036(2018)

Following injection of Carbo-Iron® into an aquifer contaminated with PCE, combined chemical and microbiological contaminant degradation processes were found in a long-term study of the field site in Lower Saxony (Germany). Carbo-Iron consists of colloidal activated carbon and embedded nanoscale zero-valent iron (ZVI) structures designed to accumulate contaminants and promote their reductive dechlorination. The particles decreased the redox potential of the groundwater by their reaction with oxygen and by the ZVI-corrosion-induced formation of molecular hydrogen up to 190 d after injection, the latter promoting sulfate-reducing conditions. Overall, the moderate and slow change of environmental conditions mediated by Carbo-Iron not only supported organohalide-respiring bacteria but also created the basis for a subsequent microbial oxidation step.



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