Given the following data about an activated sludge plant, calculate the SRT at which it is operating:

Influent flow = 9,020,000 GPD Aeration basin dimensions: 160 × 50 × 18 ft Final clarifier dimensions: 94 ft diameter; 12 ft deep MLVSS Concentration: 2,800 mg/L Waste sludge concentration: 5440 mg/L Waste sludge flow rate: 91,000 GPD Effluent TSS concentration: 10 mg/L