What are diaphragm pumps commonly used for?

• A. Heating systems
• B. Adding chemicals or polymer
• C. Monitoring sludge levels
• D. Dechlorination

Answer: (B)

Diaphragm pumps are chosen for chemical dosing in wastewater treatment because they deliver a precise, controllable amount of fluid with each stroke. As positive displacement devices, they move a fixed volume per cycle, which makes it easy to meter exact doses of chemicals such as coagulants or polymers. They handle viscous or abrasive chemical solutions well and provide reliable, steady flow into the process, which is essential for consistent treatment.

That’s why adding chemicals or polymer is the best fit. They’re not typically used for heating system circulation, and sludge level monitoring is done with sensors, not pumps. While diaphragm pumps can be used for dechlorination as part of chemical dosing, their primary role in this context is injecting chemicals or polymer.