What is the purpose of an evaporator in chlorine treatment?

• A. To store chlorine gas
• B. To convert liquid chlorine to chlorine gas
• C. To monitor chlorine levels
• D. To purify water

Answer: (B)

The purpose of an evaporator in chlorine treatment is to convert liquid chlorine to chlorine gas. In the process of water treatment, chlorine is often handled in liquid form due to its efficient storage and transportation. However, for disinfection purposes, chlorine needs to be in a gaseous state before it can effectively interact with microorganisms in the water.

The evaporator facilitates this conversion by using heat to vaporize the liquid chlorine, thus generating chlorine gas. This gas can then be injected into the water supply for chlorination, where it acts as a disinfectant to eliminate harmful pathogens, ensuring the safety and quality of the water before distribution.

The other choices do not serve the primary function associated with chlorine treatment processes. Storing chlorine gas does not involve an evaporator, monitoring chlorine levels pertains to maintaining appropriate dosage rather than converting the form of chlorine, and purifying water is the overall aim of the treatment process, but not a specific function of the evaporator itself.