ΕΘΝΙΚΟ ΜΕΤΣΟΒΙΟ ΠΟΛΥΤΕΧΝΕΙΟ

C/C 0 %
Third batch experiment
The third batch experiment was conducted with the working parameters of the
second batch experiment, except from the GAC bed depth, which was reduced to
0,04 m at each column. The concentrations of the EC’s were 2 μg/L and the linear
flow rate of the solution was 3,13 m/h. The results from this batch experiment clearly
showed breakthrough of all EC’s at all columns of the system. After approximately
one week microbiological activity was also observed in column A.
From the results of this batch experiment breakthrough curves for each EC
were made (for example Figure 4 shows the breakthrough curves from the third batch
experiment of the EDC Bisphenol-A and the PPCP Ibuprofen) 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 (for example Figure 5
shows the Bohart-Adams lines from the third batch experiment of the EDC
Bisphenol-A and the PPCP Ibuprofen). Finally, for each EC the Lcritical was calculated
from the constants N0 and K respectively.
The Bohart-Adams lines that were made in this batch experiment showed
good correlation of GAC bed depth and column service time (time needed to reach the
concentration of the breakthrough limit). R-square values were ranged from 0,9768
(Naproxen) to 0,9987 (Triclosan).
100
80
60
40
20
0
Bisphenol-A
0 5 10 15 20 25
Time {days}
Figure 4 : Breakthrough curves of Bisphenol-A (left) and Ibuprofen (right)
(column A is -○-, column B is -□-, column C is -∆- and column D is -×-).
~ viii ~
C/C 0 %
120
100
80
60
40
20
0
Ibuprofen
0 5 10 15 20 25
Time {days}