Treatment Plant Operator Exam Study Guide Answers

Here are the answers to the Feb. 23, 2023 edition of TPO's Exam Study Guide: Given the following data what is the F/M ratio? 1.5 mgd activated sludge facilityInfluent BOD 230 mg/lEffluent BOD  12 mg/lInfluent TSS 240 mg/lEffluent TSS 6 mg/lFlow 1,250,000 gallonsMLSS 1,400 mg/lRasMLSS 2,300 mg/l The answer to this question is B, .14 F/M ratio. This can be solved using the F/M ratio formula. To calculate, you use a pounds formula on the incoming BOD and pounds of MLSS in the aeration basin. This is a process control tool to ensure you have the proper amount of “bugs” to feed on