Ontario Operator-in-Training (OIT) Practice Exam

What does carbon do in water treatment processes?

1. Absorbs inorganic compounds

2. Absorbs organic compounds

3. Releases nitrogen gases

4. Increases water temperature

The correct answer is: Absorbs organic compounds

Carbon plays a critical role in water treatment processes, particularly in the form of activated carbon. Its primary function is to adsorb organic compounds present in water, which is key to reducing contaminants and improving water quality. This process occurs as the porous structure of activated carbon provides a vast surface area that attracts and holds onto organic pollutants, including those that can impart taste and odor to water. By effectively removing these organic compounds, carbon not only helps in clarifying the water but also significantly contributes to the overall safety and palatability of the water supply. This process is vital in various stages of water treatment, especially in advanced treatment systems and filtration processes where the removal of dissolved organics is crucial. In contrast, other mentioned roles are not primary functions of carbon in water treatment. For instance, while it may interact with some inorganic compounds, the efficiency and focus of carbon specifically target organic contaminants. Similarly, carbon does not have a significant role in releasing nitrogen gases or in altering water temperature, making its main function to absorb organic compounds critical in treatment protocols.