California Wastewater Treatment Operator Practice Exam 2025 - Free Wastewater Treatment Operator Practice Questions and Study Guide

Question: 1 / 400

Which process includes a blower?

Rotating biological contactors

Activated sludge

Activated sludge is the only one of the four processes that utilizes a blower. A blower is used in the aeration tank to supply air for the microorganisms to consume and break down organic matter in the wastewater.

Rotating Biological Contactors (A) use rotating discs or drums that the microorganisms attach to and the wastewater flows over these discs to treat. There is no need for a blower in this process.

Trickling Filters (C) have wastewater trickling over a medium where the microorganisms grow. There is no need for a blower in this process.

Moving Bed Biofilm Reactors (D) use submerged plastic media where the microorganisms grow. There is no need for a blower in this process.

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Trickling filters

Moving bed biofilm reactors

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