California Wastewater Operator Exam, Preliminary and Primary Treatment: all 23 questions

All questions from the Preliminary and Primary Treatment section for California Wastewater Operator Exam, each with the correct answer.

3001Under the California operator certification regulations, preliminary treatment is a process that
3002Primary treatment is a process that
3003The main purpose of a bar screen is to
3004The typical approach velocity in the channel ahead of a mechanically cleaned bar screen is about
3005What is the purpose of a grit chamber?
3006The velocity in a horizontal-flow grit channel is normally controlled at about
3007If a grit chamber velocity is too low, the result will most likely be
3008A comminutor or grinder is used to
3009The most common cause of odors from a preliminary treatment area is
3010How should screenings from a bar screen be handled?
3011The main function of a primary clarifier is to
3012The typical detention time in a primary clarifier is
3013Which problem is most likely to result from leaving sludge in a primary clarifier too long?
3014A primary clarifier's overflow rate is calculated by dividing
3015If the flow to a clarifier increases and nothing else changes, the surface overflow rate will
3016Scum collected from a primary clarifier is normally sent to
3017Which is the best indicator that a primary clarifier is being operated properly?
3018Pumping primary sludge too infrequently will most likely cause
3019A flow equalization basin is used to
3020Which action helps protect pumps from damage caused by rags?
3021Which of the following is a routine maintenance task for a primary clarifier drive mechanism?
3022State design criteria based on the Ten States Standards commonly recommend a primary clarifier weir loading rate in which range?
3023Wastewater lift stations are usually equipped with a high-level alarm to

California Wastewater Operator Exam, Preliminary and Primary Treatment: all 23 questions

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