ΕΘΝΙΚΟ ΜΕΤΣΟΒΙΟ ΠΟΛΥΤΕΧΝΕΙΟ

C/C 0 %
100
From the results of this modification breakthrough curves for each EC were
made, except for Bisphenol-A, where the modification could not be clearly applied
(for example Figure 8 shows the breakthrough curves from the time modification of
the PPCPs Ibuprofen and Ketoprofen) and the breakthrough limits of the second batch
experiment were applied. The Bohart-Adams model was applied for each EC and the
constants N0 and K were calculated. Finally, for each EC the Lcritical was calculated
from the constants N0 and K respectively.
From the results of the time modification only adsorptive capacities (N0) could
be extracted, as adsorption rate constants (K) and critical bed depths (Lcritical) gave
negative values. As mentioned above, the results from the second batch experiment
are not trustworthy, apart from the problems arisen, because for the Bohart-Adams
lines there were only breakthroughs on column A and the last sample from column B.
So, for the lines there were only two spots, from which the one was uncertain.
80
60
40
20
0
Figure 8 : Breakthrough curves of Bisphenol-A (left) and Ibuprofen (right)
(column A is -○-, column B is -□-, column C is -∆- and column D is -×-).
Aggregate results
Ibuprofen
0 10 20
Time {days}
30 40
According to the Bohart-Adams model the constants N0 and K are also
depending in the linear flow rate of the solution (when the linear flow rate increases
the adsorption rate constant K also increases, while the adsorptive capacity N0 is
decreasing respectively).
~ xi ~
C/C 0 %
80
60
40
20
0
Ketoprofen
0 5 10 15 20 25 30 35
Time {days}