Recommendations
UASB check-list: hydraulic parametersVelocity gradient in pipes and circular orificesFlocculated water distribution under platesSettling tank: hydraulic superficial loading rateTank drainage timeHead loss coefficient in orifices and strainers

Lamellar settling modules

Input data

Incoming flow

Water temperature

Number of modules (n)

Module length (a)

Module width (b)

Distance between modules (d)

Shape factor (Sc)

Angle

Output data

Critical sedimentation velocity

Water velocity

L1

L2

Description

Given the water temperature, the flow to be treated, the number, dimensions, and spacing of the modules, their slope relative to the horizontal, and the corresponding Sc coefficient, this calculation determines:

  • The flow velocity between the modules.
  • The critical sedimentation velocity of the flocs to be removed.

Failed to load imageLamellar Settling Modules

Input Data

Parameter
Standard Units
Description
Incoming flow (Q)
L/s
Water flow entering the system
Water temperature (T)
°C
Temperature of the water in the system
Number of modules (n)
-
Total number of modules in the system
Module length (a)
m
Length of each lamellar module
Module width (b)
m
Width of each lamellar module
Distance between modules (d)
m
Spacing between lamellar modules
Shape factor (Sc)
-
Module shape coefficient
Angle
degrees
Slope of the modules relative to the horizontal

Output Data

Parameter
Standard Units
Description
Critical sedimentation velocity
cm/min
Minimum velocity required for floc sedimentation
Water velocity
cm/s
Flow velocity between the modules
L1
m
Effective module length considering sedimentation effects
L2
m
Length associated with sedimentation
Treated water flow
L/s
Flow of water after treatment

References

  • YAO, K. M. (1970). Theoretical study of high-rate sedimentation. Journal WPCF, v.42, n.2, p.218-28, Feb.