Page 426 - Water and wastewater engineering

SEDIMENTATION 10-43

Width of each tank
Length of settler
Length of each tank
Side water depth
Depth of sludge zone
v approach
v fc
Reynolds number
Froude number
Number of launders
Launder length
Weir loading
Type of sludge collector

10-19. Design a horizontal flow rectangular sedimentation basin using high-rate settlers for
3
a maximum day design flow rate of 15,000 m /d. Assume a water temperature of
15 C, that the angle of the settler tubes is 60 , and that they have a hydraulic diameter
of 0.05 m. Also assume the floc has excellent settling characteristics. Provide the fol-
lowing in your summary of the design:

Q design
Number of tanks
Width of each tank
Length of settler
Length of each tank
Side water depth
Depth of sludge zone
v approach
v fc
Reynolds number
Froude number
Number of launders
Launder length
Weir loading
Type of sludge collector

10-8 DISCUSSION QUESTIONS

10-1. Use a scale drawing to sketch a vector diagram of a horizontal-flow sedimentation
tank that shows how 25 percent of the particles with a settling velocity one-quarter
that of the overflow rate will be removed.