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 Par shall Flume? Correct Answer: Measure the flow rate What is the typical removal efficiency of settle able solids in a primary clarifier? Correct Answer: 95 to 99% Which of the following is true about pumping 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 clarifier? 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 Answer: never 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 Which of the following is true about COD and BOD? Correct Answer: they are indirect measurements of the organic content in the influent What is the purpose of the grit channel? Correct Answer: remove heavy inorganic waste Which of the following is true about the extended aeration process? Correct Answer: it does not produce as much waste sludge as other processes What is the correct formula for solids in raw wastewater? Correct Answer: Non settleable solids + settleable solids = total suspended solids
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