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How to desalinate water - Test
Contributed by: Frost
  • 1. What is desalination?
A) Boiling water
B) Removing salt from water
C) Adding salt to water
D) Filtering water for bacteria
  • 2. Which is the most common desalination method?
A) Reverse Osmosis
B) Electrodialysis
C) Distillation
D) Forward Osmosis
  • 3. What type of membrane is used in Reverse Osmosis?
A) Semi-permeable
B) Impermeable
C) Porous
D) Fully permeable
  • 4. What is the byproduct of desalination?
A) Hydrogen
B) Freshwater
C) Salt crystals
D) Brine
  • 5. Which energy source is often used for desalination plants?
A) Wind Power
B) Hydro Power
C) Kinetic Energy
D) Fossil Fuels
  • 6. What is the primary driving force in Reverse Osmosis?
A) Temperature
B) Gravity
C) Pressure
D) Electrical Current
  • 7. What is the main environmental concern related to desalination?
A) Freshwater Usage
B) Salt Shortage
C) Carbon Emissions
D) Brine Disposal
  • 8. Which region heavily relies on desalination for its water supply?
A) Middle East
B) South America
C) North America
D) Europe
  • 9. What is the purpose of pretreatment in desalination?
A) Add Salt
B) Increase Pressure
C) Cool the Water
D) Remove Suspended Solids
  • 10. What type of process is distillation?
A) Thermal
B) Biological
C) Mechanical
D) Chemical
  • 11. What does MED stand for in desalination?
A) Multi-Effect Distillation
B) Membrane Enhanced Desalination
C) Multi-Electrode Desalination
D) Mechanical Energy Desalination
  • 12. What material are RO membranes typically made of?
A) Cotton
B) Polyamide
C) Glass
D) Steel
  • 13. What is the purpose of the concentrate stream in RO?
A) Pre-heat the Water
B) Increase Water Flow
C) Remove Rejected Salts
D) Clean the Membrane
  • 14. What is a disadvantage of distillation compared to RO?
A) Easier to Maintain
B) Higher Energy Consumption
C) Lower Water Quality
D) More Environmental Damage
  • 15. What is the salinity of seawater in parts per thousand (ppt)?
A) 35 ppt
B) 1 ppt
C) 5 ppt
D) 50 ppt
  • 16. What is a common method for brine disposal?
A) Ocean Outfall
B) Bottled Water
C) Agricultural Irrigation
D) Drinking Water
  • 17. Which desalination method relies on an electrical field?
A) Distillation
B) Reverse Osmosis
C) Electrodialysis
D) Forward Osmosis
  • 18. What is the main advantage of forward osmosis?
A) Simpler Technology
B) Cheaper Membranes
C) Higher Water Quality
D) Lower Energy Consumption
  • 19. What is scaling in desalination?
A) Salt Concentration Increase
B) Mineral Buildup
C) Water Pressure Decrease
D) Membrane Rupture
  • 20. What is the primary function of post-treatment in desalination?
A) Adjust pH and Minerals
B) Increase Pressure
C) Heat the Water
D) Remove Remaining Salt
  • 21. What is the purpose of a 'draw solution' in forward osmosis?
A) Induce Osmosis
B) Clean the Membrane
C) Remove Salt
D) Increase Pressure
  • 22. What is the biggest barrier to widespread desalination adoption?
A) Salt Availability
B) Public Opinion
C) Technology
D) Cost
  • 23. What is a potential benefit of co-locating desalination with power plants?
A) Reduced Water Quality
B) Increased Salt Concentration
C) Higher Energy Costs
D) Waste Heat Utilization
  • 24. What does MSF stand for in desalination?
A) Multi-Stage Flash Distillation
B) Mechanical Salt Fluctuation
C) Membrane Surface Fouling
D) Multi-Salt Filtration
  • 25. Which type of desalination is best suited for small scale or remote locations?
A) Reverse Osmosis
B) Electrodialysis
C) MSF
D) Solar Distillation
  • 26. What is the typical recovery rate of a RO desalination plant?
A) 40-60%
B) 10-20%
C) 90-100%
D) 70-80%
  • 27. What is the role of antiscalants in RO desalination?
A) Clean Membranes
B) Prevent Scaling
C) Add Minerals
D) Increase Pressure
  • 28. What type of energy can be used to power distillation processes?
A) Solar Thermal
B) Wind Energy
C) Sound Waves
D) Kinetic Energy
  • 29. Which of these desalination technologies is the least energy intensive?
A) Reverse Osmosis
B) Multi-Effect Distillation (MED)
C) Forward Osmosis
D) Multi-Stage Flash Distillation (MSF)
  • 30. What impact does increasing seawater temperature have on RO desalination?
A) Increases Permeability
B) Decreases Permeability
C) Damages Membranes
D) No Impact
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