Tennessee Wastewater Operator Practice Exam

At what temperature are conventional mesophilic digesters typically operated?

1. 25C

2. 30C

3. 35C

4. 40C

The correct answer is: 35C

Conventional mesophilic digesters are typically operated at temperatures in the range of 30°C to 40°C. The optimal temperature for mesophilic digestion is around 35°C. This temperature range promotes the most efficient biological processes carried out by the mesophilic microorganisms responsible for breaking down organic matter in wastewater. At this temperature, these microorganisms are active and able to effectively metabolize nutrients and degrade waste, producing biogas, which primarily consists of methane and carbon dioxide. Operating outside this temperature range can lead to reduced efficiency in the digestion process, slower rates of digestion, or even failure to achieve the desired biochemical reactions necessary for effective waste treatment. Therefore, 35°C is widely accepted as the standard operation temperature for conventional mesophilic digesters to ensure optimal microbial activity and biogas production.