Why is an aerobic digester covered?

The primary reason for covering an aerobic digester is to hold in gas. In aerobic digestion, microorganisms break down organic matter in the presence of oxygen, producing gases, primarily carbon dioxide and some methane. Covering the digester helps to contain these gases, which can be collected and utilized, thus enhancing the efficiency of the process.

When a digester is covered, it also prevents external contaminants, such as debris or rainwater, from entering, which can disrupt the biological processes. Additionally, while protecting from extreme cold may be a consideration in some scenarios, the main function of a cover is to create a controlled environment for the digestion process and facilitate gas collection.

Understanding the importance of gas containment allows operators to manage digestion systems more effectively, optimize performance, and prevent potential environmental issues associated with gas emissions.