Page 33 - Simplified Wastewater Treatment Fundamentals\SBR
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Sequential Batch Reactors (SBR)
Example
A single rectangular SBR Tank with the dimensions of 100 feet long, 30 feet wide and 14 feet deep
holds 6 feet of settled solids at the end of the decanting phase. With an influent flow of 1.78 MGD, how
long would it take to fill the tank during the fill phase?
Volume in cubic feet 100 x 30 x 14 = 42,000 cubic feet
Gallons 100 x 30 x 14 x 7.48 gallons/cubic foot = 314,160 gallons
Tank Space (excluding the settled sludge) 14 feet deep – 6 feet of settled solids = 8 feet of tank space
available
314,160 gallons ÷14 feet = 22,440 gallons per foot
22,440 gallons per foot x 8 feet = 179,570 gallons
0.180 MG x 24 Hours = 2.43 Hours
1.78 MGD
In this example, it would take 2.43 hours to fill the SBR under the existing flow rate of 1.78 MGD.
