Ace the California Wastewater Treatment Operator Exam 2025 – Dive In and Purify Your Career!

Question: 1 / 400

Which of the following best describes the primary treatment stage?

A focus on nutrient removal

A method of using chemicals to neutralize contaminants

The physical separation of solids from liquids

The primary treatment stage of wastewater treatment is characterized by the physical separation of solids from liquids. This process typically involves the use of sedimentation or clarification techniques, where larger trash, debris, and suspended solids settle to the bottom of a tank due to gravity. This step is crucial for reducing the solid load in the wastewater before it moves on to secondary treatment, which usually involves biological processes.

In this context, the primary treatment effectively removes a significant portion of the total suspended solids and some biochemical oxygen demand (BOD) from the wastewater. By concentrating on the physical aspects rather than chemical or biological procedures, this stage sets the foundation for the more complex treatment processes that follow, ensuring that the subsequent stages can operate more efficiently.

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The application of biological processes

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