Waste Water Treatment (Triple) Quiz
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5 questions, one answer each
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1. What does 'potable' mean when describing water?
- A. Completely free of any dissolved substances
- B. Safe to drink
- C. Salt water only
- D. Untreated water straight from a river
2. Which step in UK potable water production specifically kills microbes?
- A. Choosing a fresh water source
- B. Passing water through filter beds
- C. Sterilising with chlorine, ozone or UV light
- D. Sedimentation
3. Which two methods can be used for desalination of sea water?
- A. Filtration and sedimentation
- B. Distillation and reverse osmosis
- C. Chlorination and screening
- D. Anaerobic and aerobic digestion
4. During sedimentation of waste water, what are the two products formed?
- A. Potable water and pure water
- B. Sewage sludge and effluent
- C. Chlorine gas and grit
- D. Filtered water and sterilised water
5. A coastal town has plenty of sea water but very little fresh water, while an inland town has a nearby lake. Which town is likely to use more energy producing potable water, and why?
- A. The inland town, because lakes require more filtering
- B. The coastal town, because desalination (distillation or reverse osmosis) is more energy-intensive than treating fresh water
- C. Neither, because both processes use the same amount of energy
- D. The coastal town, because sea water cannot be made potable at all