Massachusetts Wastewater Practice Exam

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In a PLC system, what is usually controlled regarding chemical addition?

Routine maintenance schedules
Water temperature
The type of treatment chemistry used
The addition of acid or caustic to a tank

The correct answer is: The addition of acid or caustic to a tank

In a PLC system for wastewater treatment, the addition of acid or caustic to a tank is a critical function that is often automated and carefully controlled. This chemical addition is essential for processes such as pH control, where maintaining an optimal pH level is necessary for effective treatment. The PLC can monitor real-time conditions and automatically adjust the chemical feed based on predefined set points or feedback from sensors. Managing chemical addition through a PLC system ensures precise dosage, which helps in achieving desired outcomes, such as optimizing reaction rates, enhancing the efficacy of subsequent treatment stages, and minimizing the risks associated with chemical overuse or underuse. By controlling the addition of these chemicals, operators can maintain compliance with regulatory requirements and prevent environmental issues linked to improper pH levels in the treatment process.