Repeat Problem 16-1 for the town of Pea Ridge using a design flow rate of 8,450 m3/d and...

Repeat Problem 16-1 for the town of Pea Ridge using a design flow rate of 8,450 m³/d and an influent BOD₅ of 137 mg/L.

Problem 16-1

Using the assumptions given in Example 16-1 , the rule-of-thumb values for growth constants in the example, and the further assumption that the influent BOD₅ was reduced by 32% in the primary tank, estimate the liquid volume of a completely mixed activated sludge aeration tank for Perryville. The design flow rate is 34,560 m³/d and the design influent BOD₅ is 188 mg/L. Assume an MLVSS of 2,000 mg/L.

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 BOD₅ and 30.0 mg/L total suspended solids (TSS). They have selected a completely mixed activated sludge system. Assuming that the BOD₅ of 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.