TABLE OF CONTENTS Pages Symposium 1 - the National Sea ...

higher superficial air velocity greatly increased the removal rates and removal
efficiencies of protein and TSS in bulk solution. Each substance removal was nearly
proportional to the superficial air velocity used. This might be due to the increases in the
area of air-water interface resulted from the higher superficial air velocity, which can
cause increasing amount of substances adsorbed.
Protein removal rate, g/m 3 ¡¤min
12
10
8
6
4
In Fig. 4 removal rates and removal efficiencies of protein and TSS were plotted as
function of the air distributor pore size. With the increasing pore size of air distributor,
removal rates and removal efficiencies of protein and TSS were decreased. When
reducing the pore size of air distributor, the bubble diameter was diminished. This was
due to the increased interfacial area available for protein adsorption, with more protein
and TSS entering the foam phase, thus promoting removal.
Protein removal rate, g/m 3 ¡¤min
6
5
4
3
2
1
(a)
Air
stone
(a)
Air distributor
Removal rate
Removal efficiency
2
0
0.0 0.5 1.0 1.5 2.0 2.5
Superficial air velocity, cm/sec
G4 G2 G1
0 30 60 90 120
0
150
Pore size, §­
Removal rate
Removal efficiency
100
80
60
40
20
Protein removal efficiency, %
100
80
60
40
20
Protein removal efficiency, %
To determine the effect of a foam separator on dissolved oxygen transfer to sea water,
dissolved oxygen saturation were measured with various hydraulic residence times and
superficial air velocities and calculated out the overall mass transfer coefficient. As
shown in Fig. 5, the hydraulic residence time for highest overall oxygen mass transfer
coefficient was the optimum condition for the highest protein removal rate. And the
higher superficial air velocity substantially increases dissolved oxygen saturation in the
bulk solution.
3
TSS removal rate, g/m 3 ¡¤min
20
18
16
14
12
10
Air
stone
(b)
Air distributor
G4 G2 G1
Removal rate
Removal efficiency
0 30 60 90 120
0
150
Pore size, §­
Fig. 4. The effect of air distributor pore size on protein (a) and TSS (b) removal.
TSS removal rate, g/m 3 ¡¤min
26
24
22
20
18
Removal rate
Removal efficiency
16
0
0.0 0.5 1.0 1.5 2.0 2.5
Superficial air velocity, cm/sec
Fig. 3. The effect of superficial air velocity on protein (a) and TSS (b) removal.
(b)
100
80
60
40
20
100
80
60
40
20
TSS removal efficiency, %
TSS removal efficiency, %