Florida Wastewater Practice Test

Why is an aerobic digester typically covered?

1. To control odors

2. To reduce evaporation

3. To protect from cold weather

4. To prevent contamination

The correct answer is: To protect from cold weather

An aerobic digester is typically covered primarily to control odors. This type of digester processes organic material in the presence of oxygen, and during this process, volatile compounds that can produce unpleasant odors may be released. By covering the digester, the release of these odors into the surrounding environment can be minimized, thereby maintaining compliance with regulatory requirements and reducing an impact on nearby communities. While reducing evaporation can also be a concern in certain applications, covering the digester serves the more critical function of odor control. Protection from cold weather is not a primary reason for covering an aerobic digester, as the design of the digester and the nature of aerobic digestion itself are generally capable of functioning effectively within a range of temperatures. As for preventing contamination, while a cover may help reduce external factors, the primary objective remains the management of odors associated with the digestion process.