Page 356 - Fundamentals of Water Treatment Unit Processes : Physical, Chemical, and Biological

Flocculation 311

W(basin) (m) 13.1 13.1 13.1 13.1 13.1 13.1 13.1 13.1 13.1 L V=D SA i ? r(b) i (m 5 ) 17.04 12.90 17.04 17.04 17.04 17.04 17.04 17.04 17.04 SA i r(b) i (continued)

L(com) (m) 4 4 4 4 4 4 4 4 4 depth Equals r(b) 5 (m) 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 0.13 r 1 0.07

r 1
0.30
r(b) 4
0.56
0.56
0.56
0.56
0.56
0.56
0.56
0.56
0.56
(m)
Depth (m) 4 4 4 4 4 4 4 4 4 Assumed
r(b) 3 (m) 0.99 0.99 0.99 0.99 0.99 0.99 0.99 0.99 0.99 0.53 r 1
Sizing V(com) (m 3 ) 210.3 210.3 210.3 210.3 210.3 210.3 210.3 210.3 210.3 V=N(com) Arms
Basin r(b) 2 (m) 1.41 1.41 1.41 1.41 1.41 1.41 1.41 1.41 1.41 r 1 0.75
N(com) of) (No. 3 3 3 3 3 3 3 3 3 of No. compartments r(b) 1 (m) 1.88 1.88 1.88 1.88 1.88 1.88 1.88 1.88 1.88 w 1 0.5

(D=2)
0.05
Dia
Comp (desig.) 1 2 3 1 2 3 1 2 3 Designated compartment Design Wheel (m) 3.9 3.9 3.9 3.9 3.9 3.9 3.9 3.9 3.9 2 D
Computations Wheel

Slope 0.0126 0.0093 3 V (m 3 ) 630.8 630.8 630.8 630.8 630.8 630.8 630.8 630.8 630.8 V ¼ Q u Paddle N(arms)= paddle 4 4 4 4 4 4 4 4 4 Assume
Coefficients

Formula Intercept 0.00179 0.00153 u (min) 40 40 40 40 40 40 40 40 40 Assumed w(b) 5 (m) 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.2 w(b) 1

Spreadsheet Viscosity 2 Limits 0 T 20 T 50 < m (N ? s=m 2 ) 0.00179 0.00179 0.00179 0.001 0.001 0.001 0.00065 0.00065 0.00065 Formula w(b) 4 (m) 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.33 wb1

Using 20 Width w(b) 3 (m) 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.4 w(b) 1

Basin rpm Conditions Temperature (8C) 0 0 0 20 20 20 40 40 40 Given Length, w(b) 1

Flocculation Data kg=m 3 0.007 þ Blade w(b) 2 (m) 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.6

of Fixed 1 C d ¼ 1.8 r w ¼ 998 k ¼ 0.24 k ¼ 0.60 (mgd) 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 w(b) 1 (m) 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 Assume
Design

11.6 mgd gpm m 3 =s

TABLE Generic Q ¼ 6 ¼ 4167 ¼ 0.263 Q (m 3 =s) 0.2628 0.2628 0.2628 0.2628 0.2628 0.2628 0.2628 0.2628 0.2628 Given L(blade) (m) 13.04 13.04 13.04 13.04 13.04 13.04 13.04 13.04 13.04 W(basin)-0.3