What is the primary purpose of screening in water treatment?

The primary purpose of screening in water treatment is to protect pumps and mixing equipment from large objects. During the initial stages of water treatment, screening involves the physical removal of debris and large particles, such as sticks, leaves, or other floating materials, that could cause damage to pumps or interfere with the operation of treatment processes.

By employing screens—typically made of metal or plastic with openings of specified sizes—water treatment facilities effectively decrease the risk of clogging and mechanical failure. This ensures that downstream processes operate smoothly, without interruptions or significant wear on equipment.

Removing large objects at this stage is crucial as it maintains the efficiency and longevity of the treatment system. While the other options touch on aspects of water treatment, they do not accurately reflect the screening process's main function, which is focused on protecting equipment rather than altering water chemistry or improving taste.