Kentucky Wastewater Treatment Operator Certification Practice Exam

In fixed film reactors, where do bacteria primarily grow?

In the bulk liquid On the media or substrate In the effluent In sludge blanket

Correct Answer:

On the media or substrate

Explanation:

In fixed-film reactors, the microorganisms attach to surfaces and grow as a biofilm on the media. This attached community is the main site of biological activity, creating a stable layer that treats the wastewater as it flows over or through the media. The bulk liquid contains comparatively fewer free-floating bacteria because most cells are attached to the surface. The effluent is simply the water leaving the reactor, not where growth occurs. The term sludge blanket refers to suspended-growth systems, not the fixed-film setup, where growth is anchored to the media.

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