8/17/2019 Dpk_Coventional Baffle Flocculator

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8/17/2019 Dpk_Coventional Baffle Flocculator

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Water Treatment

Package Plant Design

Hydraulic Flocculator

Design

2 of 3

Design criteria for hydraulic flocculation

MWH,pp 760

Camp number to be between 25000 to 100000

Detention time to be more than 8 minutes

Polytec, NZ

USQ pp.136

Design Calculations

Q = 2.5 ML/D

Raw Water, Q = m3/s

Detention Time = 483 s > s= min > min

Try Channel Velocity = m/s > 0.15 but less than 0.45

Actual Channel Velocity = m/s

Baffle width = m Assumed

Average water height = m

r = 1000.0 kg/m3

g = 9.81 m/s2

head loss, for EACH 180 degrees turnwhere, k = 2.5 to 4.

say, k = 3

h = 0.01 m

Number of Turns = 39

head loss,   DH = m

8

0.2

0.24

0.0289

0.2

8.05

0.482

0.3

480

8/17/2019 Dpk_Coventional Baffle Flocculator

3/3

Water Treatment

Package Plant Design

Hydraulic Flocculator

Design

3 of 3

Dynamic Viscosity,   m = N.s/m2 (at 20 degrees)

G = OK

C = G.t

= OK

Tank Water Volume

Required V, = m3 for min detention time

L = m

W = m

Av H = m plus free board = m

Total Tank depth = m

H loss = m

Volume, V = m3 OK

Thus, put 3 no. Flocculator each with 13 baffles.

Summary:

L = m

W = m

H = m

No. Baffles = m say, no.13

2.1

0.6

13.98

Velocity Gradient:

Velocity Gradient:

Camp Number:

0.6

13.0

13.89

4.6

13.8

2.1

0.48

0.24

0.1

0.001

69.751484

33,481 

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