Florida Drinking Water Operator "B" Practice Test

What is a common chemical compound fed to oxidize iron and manganese?

1. Sodium hypochlorite

2. Potassium permanganate/KMnO4

3. Calcium hypochlorite

4. Sodium bisulfite

The correct answer is: Potassium permanganate/KMnO4

Potassium permanganate (KMnO4) is a highly effective chemical compound commonly used to oxidize iron and manganese in drinking water treatment processes. The oxidation process converts soluble forms of iron and manganese into insoluble precipitates, which can then be effectively removed through filtration. This is important for ensuring the aesthetic quality of drinking water, as high concentrations of these metals can lead to undesirable tastes, odors, and staining. Potassium permanganate serves not just as an oxidizing agent but also possesses strong disinfection properties, which means it can help manage microbial contamination in addition to its role in decontaminating iron and manganese. The choice of potassium permanganate is often favored for its effectiveness at various pH levels and its ability to work in low concentrations, making it a common solution in water treatment facilities. Understanding the use of potassium permanganate highlights its significance in water treatment and the necessity of treating iron and manganese to provide safe and clean drinking water for the community.