Which gas produced by certain bacteria can accelerate the corrosion process?

• A. Oxygen
• B. Nitrous oxide
• C. Carbon dioxide
• D. Sulfur dioxide

Answer: (C)

The gas that can accelerate the corrosion process produced by certain bacteria is carbon dioxide. Certain types of bacteria, particularly those involved in anaerobic decomposition, can produce carbon dioxide as a metabolic byproduct. When carbon dioxide dissolves in water, it forms carbonic acid, which can lower the pH of the water and increase its acidity. This acidic environment can lead to the dissolution of metals and enhance the overall corrosion rate of materials, particularly in environments like water pipelines and storage tanks.

Bacteria that thrive in high-carbon environments, such as those found in wastewater treatment or in certain soil types, can contribute to increased levels of carbon dioxide, thus promoting this corrosion process. Understanding the role of carbon dioxide, especially in the context of water treatment and storage, is important for managing corrosion and ensuring the longevity of infrastructure.