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!

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What is the most accurate statement about extended aeration?

An oxidation ditch is usually operated in extended aeration mode, and is used for small flows
Extended aeration is a high-rate anaerobic process
It requires minimal operator attention
It produces large quantities of excess sludge

The correct answer is: An oxidation ditch is usually operated in extended aeration mode, and is used for small flows

Extended aeration is a process used in wastewater treatment that involves longer retention times in the treatment tank, typically between 24-36 hours. This allows for more complete biological treatment of the wastewater. Option B is incorrect because extended aeration is an aerobic process, meaning it occurs in the presence of oxygen, not in the absence of oxygen as in anaerobic processes. Option C is also incorrect because extended aeration does require some operator attention to monitor and control the process. Option D is incorrect because extended aeration typically produces less excess sludge compared to other treatment methods, making it a more efficient process. Therefore, option A is the most accurate statement since oxidation ditches, which are commonly used in extended aeration, are designed for smaller flows and are operated in extended aeration mode.