FE Civil Exam Prep 79, Wastewater Treatment — Activated Sludge F/M Ratio

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - The F/M ratio is the daily mass of incoming BOD (food) divided by the total mass of microorganisms (MLVSS) in the aeration tank. - The core formula is F/M = (Q × S₀) / (V × X), found in the Environmental Engineering section of the NCEES Handbook. - A critical exam trap is distinguishing between MLSS and MLVSS; use the volatile fraction to find MLVSS, which represents the active microorganisms. - Pay close attention to units; ensure consistency (e.g., MGD and MG) to correctly apply the 8.34 lbs/gallon conversion factor. - Remember the mnemonic 'Feed the Bugs' to correctly place Food (BOD) in the numerator and Microorganisms (MLVSS) in the denominator. For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep