Why is an aerobic digester covered?

An aerobic digester is covered primarily to hold in the gases produced during the digestion process. This covering allows for the collection of valuable biogas, which can be used for energy production or other purposes. The aerobic digestion process relies on microorganisms that thrive in the presence of oxygen, and by covering the digester, the environment is appropriately maintained for these organisms to function efficiently while also capturing the gases released.

The covering also serves to protect the contents from external contaminants, ensuring the digestion process remains effective. Additionally, while temperature management is essential in many aspects of wastewater treatment, the covering's most significant purpose is related to gas management rather than merely protecting against cold weather.

In summary, the primary function of the cover of an aerobic digester is to facilitate gas collection, while also providing some level of protection from contaminants, which are critical for optimizing the digestion process.