Wastewater New York State Practice Exam

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What does purging in a treatment system do?

Recycles waste products
Removes sludge
Displaces or dilutes gas or vapor
Increases aeration

The correct answer is: Displaces or dilutes gas or vapor

Purging in a treatment system primarily serves to displace or dilute gas or vapor present within the system. This process is essential for managing the collection of unwanted gases, such as methane, hydrogen sulfide, or other volatile compounds, that can accumulate in treatment facilities. If these gases are not adequately managed, they can lead to operational hazards or affect water quality. By effectively purging, operators can reduce the concentration of harmful gases, ensuring a safer working environment and enhancing the treatment process of wastewater. This action can also help maintain optimal conditions for biological processes that occur in the treatment system. In contrast, recycling waste products, removing sludge, or increasing aeration do not specifically address the primary role of purging, as these actions pertain to different aspects of wastewater treatment and handling.