CA GRADE 2 WASTEWATER TREATMENT OPERATOR PRACTICE EXAM 1 2023 QUESTIONS AND ANSWERS ALREADY PASSED A+

What is the methane content in a properly operating anaerobic digester? - CORRECT ANS 65 to 70% by volume What will the addition of chlorine gas do to the pH of wastewater? - CORRECT ANS decrease the pH What is the purpose of a Parshall Flume? - CORRECT ANS Measure the flow rate What is the typical removal efficency of settleable solids in a primary clarifier? - CORRECT ANS 95 to 99% Which of the follwing is true about pumoing scum from a primary clarifier? - CORRECT ANS 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 ANS MLSS is too low What does the M in F/M ratio represent? - CORRECT ANS 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 ANS Increase the settling rate What could happen if the digester gas is mixed with air(85 to 95% by volume)? - CORRECT ANS Cause an explosion How will algae impact the chlorine demand in the pond effluent? - CORRECT ANS increase the chlorine demand