Welcome back to TPO magazine's Exam Study Guide Series, which offers a pair of water/wastewater study questions with in-depth explanations of the answers. Last time, we covered a set of wastewater and drinking water treatment questions on the topics of Proper Grab Sampling and Volume Calculations. This time you can test your knowledge about calculating F/M ratios and disinfection byproducts.
Wastewater Treatment Sample Question
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
