What device is used to control the feed rate of chlorine gas in a treatment plant?

The device used to control the feed rate of chlorine gas in a treatment plant is the chlorinator. A chlorinator is specifically designed to accurately and efficiently introduce chlorine gas into the water for disinfection purposes. It can regulate the amount fed based on real-time water flow and demand, ensuring that the right dosage of chlorine is maintained for effective treatment.

In the context of water treatment, accurate dosing is crucial because too little chlorine may not effectively disinfect the water, while too much can lead to unpleasant tastes, odors, and potential health risks. Therefore, the chlorinator is equipped not only to adjust the flow of chlorine gas but also to accommodate process changes and maintain consistent water quality.

While other devices, such as flow meters, and rotameter control valves, play supportive roles in measuring or indicating flow rates, they do not directly control the feed of chlorine gas. A pressure gauge, on the other hand, is primarily used to assess the pressure in the system rather than to control chemical feed rates. Thus, the chlorinator remains the most suited option for the task of controlling chlorine dosing.