1. Which of the following is the FIRST stage in the municipal wastewater treatment process train?
2. What is the primary purpose of activated sludge in aeration basins?
3. What is 'sludge bulking' primarily caused by?
4. Which of the following is a key operational parameter for monitoring the microbial population in aeration basins?
5. What valuable product can be generated during anaerobic digestion of sludge?
6. What is the purpose of Return Activated Sludge (RAS)?
7. Which treatment stage is applied 'as needed' for further polishing and often includes filters and chemical phosphorus removal?
8. BOD is a measure of:
9. What is the final step for the liquid stream before it is discharged to the river?
10. What is the primary function of primary clarifiers?