In Example 16-1 (Chapter 16), a correction was made for the allowable effluent BOD5 to a...

In Example 16-1 (Chapter 16), a correction was made for the allowable effluent BOD₅ to account for the BOD of the total suspended solids. Assume that tertiary filtration has been installed to reduce the TSS to 10 mg/L and recalculate the allowable effluent BOD₅ . Use this new estimate of S to determine the volume of the aeration tank.

Example 16-1

The town of Lawrence has been directed to upgrade its primary WWTP to a secondary plant that can meet an effluent standard of 30.0 mg/L BOD₅and 30.0 mg/L total suspended solids (TSS). They have selected a completely mixed activated sludge system. Assuming that the BOD₅of the TSS may be estimated as equal to 63% of the TSS concentration, estimate the required volume of the aeration tank. The following data are available from the existing primary plant.