CALIFORNIA WASTEWATER TREATMENT
OPERATOR COMPREHENSIVE EXAM SCRIPT
VERIFIED QUESTIONS COMPLETE
ANSWERS GRADED APLUS
◉ How often should an anaerobic digester be fed?
Answer: several times a day
◉ What is the health effect of carbon dioxide?
Answer: could lead to asphyxiation
◉ Which of the following enters the headworks of a treatment plant?
Answer: influent
◉ Which gas diminishes your sense of smell?
Answer: hydrogen sulfide
◉ What type of microorganism can use nitrate as a source of
oxygen?
Answer: facultative bacteria
, ◉ What is the equivalent of 1 mg/l?
Answer: 1 ppm
◉ Select the most accurate statement about extended aeration?
Answer: an oxidation ditch is usually operated in extended aeration
mode, and is used for small flows
◉ What is equivalent to organic solids?
Answer: volatile solids
◉ What should be done if a large amount of organic matter is found
in the grit channel?
Answer: increase the velocity of the wastewater
◉ Which flow rate should you use to calculate the hydraulic loading
to a trickling filter?
Answer: plant inflow plus recirculated flow
◉ What is the differnce between the sludge from a primary clarifier
and a secondary clarifier?
Answer: primary sludge is denser than secondary
◉ Which process includes a blower?
OPERATOR COMPREHENSIVE EXAM SCRIPT
VERIFIED QUESTIONS COMPLETE
ANSWERS GRADED APLUS
◉ How often should an anaerobic digester be fed?
Answer: several times a day
◉ What is the health effect of carbon dioxide?
Answer: could lead to asphyxiation
◉ Which of the following enters the headworks of a treatment plant?
Answer: influent
◉ Which gas diminishes your sense of smell?
Answer: hydrogen sulfide
◉ What type of microorganism can use nitrate as a source of
oxygen?
Answer: facultative bacteria
, ◉ What is the equivalent of 1 mg/l?
Answer: 1 ppm
◉ Select the most accurate statement about extended aeration?
Answer: an oxidation ditch is usually operated in extended aeration
mode, and is used for small flows
◉ What is equivalent to organic solids?
Answer: volatile solids
◉ What should be done if a large amount of organic matter is found
in the grit channel?
Answer: increase the velocity of the wastewater
◉ Which flow rate should you use to calculate the hydraulic loading
to a trickling filter?
Answer: plant inflow plus recirculated flow
◉ What is the differnce between the sludge from a primary clarifier
and a secondary clarifier?
Answer: primary sludge is denser than secondary
◉ Which process includes a blower?
