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Discussion

Reverse osmosis differs from ion exchange in that it

  • A.removes only the suspended solids
  • B.removes dissolved salts, not exchanges them
  • C.requires no applied pressure at all to work
  • D.produces no reject stream whatever

Answer: B

It gives a permeate low in total dissolved solids and a concentrated reject that must be disposed of. The reject is a significant fraction of the feed and is itself an effluent problem. Recovery of the reject is an active area of work.

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