Page 9 - Simplified Wastewater Treatment Fundementals\Primary Treatment
P. 9
Primary Treatment
A rectangular clarifier receives influent wastewater at one
end, allowing the wastewater to travel the length of the
clarifier exiting at the other end.
Rectangular clarifiers can be equipped with baffles to slow the
wastewater currents and to discourage hydraulic short
circuiting. The continuous flight assembly serves to push
sludge into the sludge sump and to also skim and collect
grease on the surface.
Rectangular primary clarifiers have multiple perpendicular
weirs near the discharge end of the clarifier to provide enough
weir length.
Weir length is critical for a primary clarifier to provide
controlled effluent flow that does not exit the tank so quickly
that it pulls the primary sludge from the bottom of the tank.
