Civil Engineering Reference
In-Depth Information
d) Schematic of radial flow
pattern in baffled tank
e) Schematic of axial flow
pattern in baffled tank
Fig. 10-13.
(
Continued
).
2.933
10
5
1.76
10
5
(
G
*)
2.8
to
30
30
9780 to 5870
G*
26.6 to 22.1 sec
1
Check
G*
-values for a detention time of
T
20 minutes. The corresponding range
of
G*
values is 30.7 to 25.6 sec
1
.
Use an optimal
G
*-value of 25 sec
1
and a detention time of 20 minutes. The
product
Gt
is 3.0
10
4
, which is within the recommended guideline of 10
4
to 10
5
.
To incorporate the advantages of tapered flocculation, the optimum design of
G*
of 25 sec
1
would be used in the third compartment. The
G
-values are tapered on
either side to yield
G
1
45 sec
1
,
G
2
35 sec
1
,
G
3
25 sec
1
, and
G
4
20 sec
1
in the four compartments.
