Environmental Engineering Mastery
Twenty random questions from a hard bank of thirty on water and wastewater treatment, waste and pollution.
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The author has made the opening questions public. Play the full quiz in the app to see the rest, with answers and explanations.
BOD stands for:
- Bacterial oxygen deficit
- Biological organic density
- Basic oxygen dissolved
- Biochemical oxygen demand
How long does the standard BOD test take?
- 24 hours at 37 °C
- 1 hour at 100 °C
- 30 days at 0 °C
- 5 days at 20 °C
Compared with BOD, the COD of the same sample is usually:
- Higher
- Lower
- Zero
- Always equal
Which coagulant is most commonly used in water treatment?
- Chlorine gas
- Common salt
- Sugar
- Alum (aluminium sulphate)
Which sequence describes conventional surface water treatment?
- Filtration, coagulation, disinfection, flocculation
- Disinfection, filtration, coagulation, sedimentation
- Coagulation, flocculation, sedimentation, filtration, disinfection
- Sedimentation, disinfection, coagulation, filtration
A slow sand filter purifies water mainly through:
- Very high-pressure pumping
- Chemical oxidation
- Ultraviolet light
- A biological layer on its surface (the schmutzdecke)
Water hardness can be removed by:
- Chlorination
- Lime-soda softening or ion exchange
- Sedimentation only
- Aeration only
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