Study Guide Answer Key

Here are the answers to the July 28, 2022 edition of TPO's Exam Study Guide: Given the following data: MLSS 1,900 mg/l; RMLSS 3,200 mg/l; Plant Q 1.65 mgdAeration tank volume 2.5 mg; RAS Q .9 mgdClarifier Volume .75 mg; aeration tank DO 3.2 mg/l How much sludge should be wasted to maintain a target MLSS of 1,750 mg/l? The answer to this question is B, 117,000 gallons. This can be solved using the pounds formula. It is a rather simple method of determining waste amounts using a target MLSS. First determine the number of pounds of sludge to be wasted, then by solving for the unknown,