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Electrodialysis removes salts from water by

  • A.driving ions through membranes under an electric field
  • B.evaporating the water and condensing the vapour
  • C.exchanging the ions on a resin bed
  • D.precipitating the ions with added chemicals

Answer: A

Alternating cation and anion permeable membranes let the applied field concentrate the salts in alternate compartments and leave the others diluted. Its energy consumption rises with the salinity, which limits it to brackish water.

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