High School

When disinfecting valves and other parts of equipment with hot water, the water temperature should be ______ with a chlorine solution of ______ concentration.

Choose one answer:

A. 120 degrees F, 25 mg/l
B. 75 degrees F, 75 mg/l
C. 55 degrees F, 85 mg/l
D. Cannot be determined without pH of the solution

Answer :

Final answer:

The water temperature should be 120 degrees F with a chlorine solution of 25 mg/l concentration.

Explanation:

When disinfecting valves and other parts of equipment with hot water, the water temperature should be 120 degrees F with a chlorine solution of 25 mg/l concentration. This is because chlorine is only slightly soluble in water and its solubility decreases at temperatures above 49° F. At temperatures between 49° F and 212° F, chlorine forms hypochlorous acid (HOCI), which is the primary disinfectant used for water/wastewater disinfection.

Other Questions