Final Assessment

Final Quiz

1. What is the main purpose of wastewater treatment? Protect health and the environment Increase odour Reduce monitoring

2. What does screening remove? Large debris Dissolved oxygen Nutrients only

3. What does aeration support? Biological treatment Pipe painting Screen cleaning only

4. What is the role of a secondary clarifier? Separate biomass from treated water Add chlorine Pump raw sewage

5. What does RAS mean? Return activated sludge Rapid aeration system Residual alkalinity sample

6. Why is DO monitored? To assess oxygen available to the biology To measure sludge depth To test pump speed

7. What can infiltration and inflow cause? Hydraulic overload Lower electricity use only Better settling always

8. Why is sludge wasting important? To control biomass age and solids inventory To increase screen loading To reduce all sampling

9. What commonly causes pump ragging? Wipes and fibrous debris Dissolved oxygen Clarifier scum

10. What should be checked when an analyser reading looks wrong? The process and the instrument Only the weather Only the operator

11. What is SCADA used for? Monitoring and control Sludge drying Manual screening

12. Why are trends useful? They show changes over time They replace sampling They remove alarms

13. What should a shift handover include? Conditions, actions and unresolved issues Only staff names Only weather

14. What does BOD relate to? Biodegradable organic load Pump head Screen opening

15. What is a drainfield used for? Soil dispersal of septic effluent Raw sewage storage Chemical dosing

16. Why maintain septic tanks? To prevent solids carryover and system failure To increase inflow To remove all bacteria

17. What should happen during an overflow? Follow emergency and reporting procedures Ignore it Silence all alarms

18. What is root cause analysis for? Preventing recurrence Changing labels Increasing flow automatically

19. What should operators do after making an adjustment? Record and review the effect Leave no note Change several other settings

20. What is the best first step in fault finding? Observe and define the problem Replace everything Bypass all controls