flow rates through the cartridge (3.1, 5.1 and 7.1 mL/min) were performed using a
constant head reservoir. Results revealed that ethanol and IPA tracers returned the most
uniform elution curves for the range of flow rates tested. The elution curves of both
tracers were non-linear in nature (Figure 3-6); therefore, not meeting the assumption of
linear desorption required by Eq. (2-5). Therefore, these elution curves were fit with
linear segments following the techniques used in Hatfield et al. (2004). The linear
segments whose parameters are listed in Table 3-5, produced a linear elution function for
four ranges of MR/MI. The mass remaining, as determined by GC analysis, was then be
used to calculate Qc based on the parameters of the linear segment which described it.
The cartridge flow rate was in turn used to calculate the AH across the PSFM cartridge, a
parameter required for estimating water velocity.
3.1 r.nlrrin
S0.8 5. 1 .1L/rrin
A 7.1 rL/rrrin
0.6 "---..
E
u) 0.4
V)
S0.2 Ui
0 ----------------------------I---------------
Rdl Rd2
0 20 40 60 80
Pore Volumes
a.
Figure 3-6: Breakthrough curves for a activated carbon/tracer elution study. a) IPA
elution at three different flow rates with linear segments described by the
parameters (p and Rdi.. b) Ethanol elution at three different flow rates with
linear segments described by the parameters (p and Rdi.