California Wastewater Treatment Operator Practice Exam

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Prepare for the California Wastewater Treatment Operator Exam. Gain knowledge through multiple-choice questions and flashcards. Understand key concepts and regulations essential for wastewater treatment operations in California.

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Which of the following is not associated with a trickling filter?

  1. plastic media

  2. rock media

  3. filamentous bacteria

  4. fixed film growth

The correct answer is: filamentous bacteria

Filamentous bacteria is not associated with a trickling filter because trickling filters operate on the principle of fixed film growth, where microorganisms attach to a solid surface (such as plastic or rock media) and treat wastewater as it flows over them. Filamentous bacteria do not form a fixed film and are not commonly found in trickling filters. This type of bacteria is typically associated with activated sludge treatment processes, where they can cause sludge bulking and other operational issues. Therefore, options A, B, and D are all associated with a trickling filter, making C the correct answer.

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