Page 279 - Water and wastewater engineering

6-56 WATER AND WASTEWATER ENGINEERING

0.4 m

2.5 m
1.0 m
Flow 10.3 m 2.5 m 3 Cross-flow
paddle wheels
1.0 m on each shaft
2.5 m

0.4 m Plan

Baffle Baffle
0.4 m

5.0 m 4.2 m
Flow

0.4
4.2 m 4.2 m 4.2 m
0.4 m 0.4 m
0.8 m 0.8 m
15 m
Profile

One paddle wheel
w

D 4.2m

2.5m
w
w 0.14 m
FIGURE P-6-23
(Source: Peavy et al., 1985.)

6-22. Design the first compartment of a cross-flow paddle flocculator for the city of None-
such by determining the basin dimensions, the paddle configuration, the power
requirement, motor power, and rotational speeds for the following parameters:
3 3
Design flow rate 36 10 m /d
t 23 min
1
Three flocculator compartments with G 40, 30, 20 s