What is the purpose of a contact tank in a water treatment system?

The purpose of a contact tank in a water treatment system is to facilitate chemical reactions between water and treatment chemicals. In this setting, the contact tank serves as a vessel where water comes into prolonged contact with various chemicals, enabling processes such as disinfection or coagulation to take place effectively. This is essential for achieving the desired water quality, as it allows for the necessary time and conditions for the reactions to occur, which can help remove contaminants and improve the overall quality of the water.

Softening water, injecting treatment chemicals, or ensuring a continuous water supply might be components of a water treatment system, but they do not specifically define the primary role of a contact tank, which is centered around allowing chemical reactions to take place in a controlled environment.