Which type of pump typically feeds chemical solutions at a potable water treatment plant?

In potable water treatment plants, precise control of chemical dosing is essential for ensuring water quality and safety. Peristaltic pumps and diaphragm pumps are particularly well-suited for this purpose.

Peristaltic pumps work by expanding and contracting a flexible tube within the pump, which moves the chemical solution in a controlled manner. This mechanism allows for accurate volumetric dosing, making it ideal for feeding chemicals such as chlorine or coagulants into the water stream. Furthermore, the chemical never comes into contact with moving parts outside the tube, which reduces the risk of contamination.

Diaphragm pumps operate on a similar principle, using a diaphragm to create a vacuum that draws in the chemical solution and then pushes it out under pressure. Like peristaltic pumps, they provide precise control over the flow rate, making them suitable for chemical dosing applications.

The other pump types, while useful in various applications, do not offer the same level of control and safety for chemical handling. Centrifugal pumps are typically used to move large volumes of liquid and may not provide the dosing accuracy required for chemical feed. Submersible pumps are often designed for pumping groundwater or wastewater and may not be suitable for the consistent dosing of chemicals. Jet pumps, while effective for