Florida Drinking Water Operator "B" Practice Test

What effect does iron and manganese have on water systems related to taste and odor?

1. Enhance flavor

2. Filter impurities

3. Promote growth of bacteria

4. Reduce sediment

The correct answer is: Promote growth of bacteria

Iron and manganese can significantly impact the taste and odor of water systems. When present in higher concentrations, both substances can create a metallic taste in drinking water, which is generally undesirable to consumers. Their presence in water systems does not promote water clarity or taste enhancement; instead, they can lead to aesthetic issues that can affect the water's acceptability for consumption. When iron and manganese oxidize, they may also promote the growth of certain types of bacteria, particularly those known for iron and manganese-related biofilms. This biological growth can further degrade water quality, contributing to unpleasant tastes, odors, and water discoloration. Some specific bacteria thrive in environments rich in these metals, leading to the formation of slime or sediment that could clog pipes and filtration systems. In contrast, the other options do not align with the typical consequences of iron and manganese presence in water systems. For example, these metals do not enhance flavor or act as purifying agents, nor do they serve as a mechanism for sediment reduction.