How are chemical feeders classified in water treatment processes?

Chemical feeders in water treatment processes are classified based on various operational characteristics, including their feeding mechanisms and types of chemicals they deliver. The correct classification encompasses dry feeders, solution feeders, volumetric feeders, and gravimetric feeders.

Dry feeders are designed to dispense powdered chemicals, while solution feeders are utilized for adding liquid chemicals to the water. Volumetric feeders operate based on a predetermined volume of chemical solution, ensuring precise dosing, whereas gravimetric feeders dispense chemicals by weight, allowing for accurate measurement based on the mass of the chemical being fed.

This comprehensive classification helps operators select the appropriate type of feeder according to the specific requirements of a given water treatment application, ensuring both efficiency and compliance with operational standards.