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