Geoscience Reference
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(a)
1000000
750000
500000
TCE
PCE
TCM
250000
0
0
500
1000
1500
2000
Volume of water to volume of DNAPL
(b)
100
10
TCE / TCM
PCE / TCM
1
PCE / TCE
0.1
0
0.1
0.2
0.3
0.4
0.5
Source depletion
Fig. 16.26 Water dissolution of DNAPL mixture, a theoretical dissolution curve for a DNAPL
mixture consisting of 10 % TCM, 40 % TCE, and 50 % PCE (v/v); b ratios of TCE and TCM,
PCE and TCM, and PCE and TCE as a function of source depletion. Reprinted with permission
from Broholm et al. (
2005
). Copyright 2005 American Chemical Society
higher dissolution rate over the first 100 days of the experiment. These results
were used to plot (Fig.
16.27
b) the observed relationship between concentration
ratio and source transformation by dissolution-induced depletion, together with the
equivalent theoretical relationships. Source depletion was calculated from the
cumulative mass removed, as determined from monitoring of effluent at specific
times, divided by the initial source mass.
The results of a field-scale test at the Borden site are reported by Rivett and
Feenstra (
2005
). This experiment used a DNAPL multicomponent system similar
to that of Broholm et al. (
2005
), with the difference being that the contamination
source was emplaced below the water table and exposed to natural groundwater
flow during a period of three years. The contamination source contained 23 kg of
