Treatment Plant Operator Exam Study Guide Answers

Given the following data for an activated sludge process, calculate the F/M (food to mass) ratio: The aeration tank has a volume of 1.5 million gallons, and the daily influent flow (Q) is 0.99 mgd. The influent total suspended solids (TSS) concentration is 240 mg/L, and the effluent TSS is 20 mg/L. The influent biochemical oxygen demand (BOD) is 320 mg/L, with an effluent BOD of 10 mg/L. The mixed liquor suspended solids (MLSS) concentration in the aeration tank is 2,100 mg/L, and the return activated sludge (RAS) MLSS is 3,240 mg/L. A settleometer reading taken after 30 minutes is 420