Water Treatment Operator-in-Training (OIT) Practice Test

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Which of the following methods is NOT commonly used for disinfection in water treatment?

Chlorination
Ultraviolet irradiation
Boiling
Coagulation

The correct answer is: Coagulation

Coagulation is a process primarily aimed at removing suspended solids from water, enhancing the overall treatment effectiveness by forming larger particles (flocs) that can be more easily filtered out. While it's an essential step in water treatment, it does not serve the purpose of disinfection. Disinfection specifically refers to methods used to kill or inactivate pathogens in water, ensuring that the water is safe for consumption. In contrast, chlorination, ultraviolet irradiation, and boiling are established disinfection methods. Chlorination involves adding chlorine to water, which effectively kills bacteria and viruses. Ultraviolet irradiation uses UV light to disrupt the DNA of microorganisms, rendering them unable to replicate and thus inactive. Boiling increases the temperature of water to a point where most pathogens cannot survive, making it another effective disinfection method. Therefore, coagulation stands apart as it does not have a disinfection function in the same manner as the other methods mentioned.