1. What is the primary form of energy recovered from anaerobic digestion of wastewater sludge?

2. Which technology is most commonly used to generate electricity from biogas produced in wastewater treatment?

3. What is the typical methane content in biogas from anaerobic digestion?

4. What is a microbial fuel cell (MFC)?

5. What is co-digestion in the context of wastewater treatment?

6. Which parameter primarily affects biogas production during anaerobic digestion?

7. What is the main limitation of microbial fuel cells?

8. Which byproduct from anaerobic digestion needs to be managed carefully?

9. How does temperature affect anaerobic digestion?

10. Which of the following is not a method of energy recovery from wastewater?