New Mexico Water Operator Level 4 Practice Exam

What is the function of a clearwell in a water treatment facility?

To store finished water indefinitely To filter water To provide contact time for disinfection and homogenize the treated water before distribution To chlorinate water

Correct Answer:

To provide contact time for disinfection and homogenize the treated water before distribution

Explanation:

A clearwell serves as a contact and blending basin after filtration so the disinfectant has time to work and the water becomes uniform before distribution. After the water is treated, the disinfectant needs a certain period of contact with microbes to effectively inactivate them; the clearwell provides that contact time by holding a large volume of water, which also slows flow and reduces short-circuiting. It also helps mix water from different treatment trains so the disinfectant residual is even throughout the outflow. While filtration happens earlier and disinfection is the goal of the treatment process, the clearwell’s role isn’t to filter or to be the main chlorination point, and it isn’t simply a place to store finished water indefinitely.

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