Grade 2 Wastewater Treatment Operator Practice Exam Q&A 2024/2025

Grade 2 Wastewater Treatment Operator Practice Exam Q&A 2024/2025 What is the methane content in a properly operating anaerobic digester? - CORRECT ANSWER-65 to 70% by volume What will the addition of chlorine gas do to the pH of wastewater? - CORRECT ANSWER-decrease the pH What is the purpose of a Parshall Flume? - CORRECT ANSWER-Measure the flow rate What is the typical removal efficency of settleable solids in a primary clarifier? - CORRECT ANSWER-95 to 99% Which of the follwing is true about pumoing scum from a primary clarifier? - CORRECT ANSWER-scum causes more piping problems than other substances pumped at a wastewater treatment plant What might cause thick billows of white sudsy foam in the aeration tank? - CORRECT ANSWER-MLSS is too low What does the M in F/M ratio represent? - CORRECT ANSWER-The mixed liquor volatile suspended solids in the aeration tank In general, how will warmer temp affect the settling rate of solids in a clarifer? - CORRECT ANSWER-Increase the settling rate What could happen if the digester gas is mixed with air(85 to 95% by volume)? - CORRECT ANSWER-Cause an explosion How will algae impact the chlorine demand in the pond effluent? - CORRECT ANSWER-increase the chlorine demand Which of the following is true about a positive displacement pump? - CORRECT ANSWER-it must never be started with the discharge valve closed What is true about the F/M ratio? - CORRECT ANSWER-the volume of the secondary clarifier is not needed to determine the f/m ratio Which of the following is one of the basic rules of lab work? - CORRECT ANSWERnever pipet hazardous material with your mouth, even if the pipet has been sterialized What is the recirculation ratio for a trickling filter? - CORRECT ANSWER-Qr/Q