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 Optimal Bacterial Growth Conditions and Water Membrane Classifications. This time you can test your knowledge about mean cell residence time and water separation processes.
Wastewater Treatment Sample Question
What is the mean cell residence time (MCRT) of the following activated sludge process, given the following data:
Aeration tank volume 2.5 mgdInfluent flow (Q) 2.25 mgdInfluent TSS 300 mg/LEffluent TSS 5 mg/LInfluent BOD 280mg/LEffluent BOD 10 mg/LAeration MLSS 2,800 mg/LRAS MLSS 4,400 mg/LSolids
