The overflow rate (surface loading rate) of a rectangular sedimentation tank determines:
Choose the correct answer
The detention time only
The minimum particle diameter that is 100% removed (particles settle faster than overflow rate are fully captured)
The volume of sludge produced
The chlorine dose required
Correct Answer
B. The minimum particle diameter that is 100% removed (particles settle faster than overflow rate are fully captured)
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Overflow rate = Q/A (m3/m2/day = m/day). All particles with settling velocity Vs > overflow rate are 100% removed; particles with Vs < overflow rate are partially removed (fraction = Vs/overflow rate). Typical for primary settling: 25-50 m3/m2/day.
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