California Wastewater Treatment Operator Practice Exam

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Study for the California Wastewater Treatment Operator Exam. Use flashcards and multiple-choice questions with detailed explanations to boost your readiness. Prepare with confidence and aim for success!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Why should sludge at the bottom of a clarifier be removed in a timely manner?

to prevent sludge gasification which causes the sludge to float
to increase sludge volume for reuse
to enhance microbiological activity in the sludge
to improve sedimentation efficiency in the clarifier

The correct answer is: to prevent sludge gasification which causes the sludge to float

Sludge at the bottom of a clarifier should be removed in a timely manner to prevent sludge gasification, which causes the sludge to float. When sludge undergoes gasification, it can rise to the surface, affecting the clarifier's performance by interfering with the settling process and potentially causing solids carryover. This can reduce the effectiveness of the clarifier in solids removal and overall treatment efficiency. Therefore, timely removal of sludge helps maintain the proper operation of the clarifier and prevent issues related to gasification.