reduction was most likely caused by the combined effect of dilution and reduction of
ClE contamination present in the groundwater. One month after the injection, the
process of dilution did not play an important role in the decrease in the ClE
concentrations. Therefore, the following reduction of contamination probably
resulted from the dechlorination process.
For the determination of the reductive potential of the applied nZVI reduction
ratio, periods of 2 and 3 months after the injection were important, which represented
66% and 54%, respectively, in the case of the total ClE concentrations. The nZVI
application showed very high reductive efficiency in TCE, which rebounded to only
21% 3 months after the nZVI injection, compared with its pre-application concentration—79% reduction of TCE was monitored in AW5–57. Its moderate increase at
Fig. 5.3 Effect of the application of NANOFER STAR application on E H values. (Adapted from
Vacková 2018)
Fig. 5.4 Reduction of ClE in AW5–57 after the application of NANOFER STAR. (Adapted from
Vacková 2018)
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V. Stejskal and N. Vacková