Florida Drinking Water Operator "B" Practice Test

Which chemical is commonly used to control taste and odor producing algae?

1. Alum

2. Chlorine

3. Copper sulfate

4. Sodium bicarbonate

The correct answer is: Copper sulfate

The correct choice for controlling taste and odor-producing algae is copper sulfate. Copper sulfate is an algaecide that specifically targets algae growth and is effective at reducing algal blooms in water bodies. When applied appropriately, it disrupts the cellular functions of the algae, leading to their die-off and consequently, reduces the organic material that contributes to undesirable tastes and odors in drinking water. Using copper sulfate is advantageous in treating water sources that have become problematic due to excessive algal growth, especially during warmer months when algae are more likely to proliferate. By controlling these algae, water treatment facilities can help ensure the quality of drinking water remains high, preventing complaints from the community regarding taste and odor issues. In contrast, alum is typically used as a coagulant to remove suspended solids and clarify water, while chlorine is primarily used for disinfection purposes to kill pathogens. Sodium bicarbonate, on the other hand, is used more for pH adjustment and does not have a direct role in controlling algae. Each of these alternatives serves important functions in water treatment, but they do not target taste and odor caused by algal growth in the same way copper sulfate does.