Water desalination process and apparatus

  • US 7,459,088 B2
  • Filed: 09/13/2005
  • Issued: 12/02/2008
  • Est. Priority Date: 09/13/2004
  • Status: Active Grant
First Claim
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1. A process for treating a water stream comprising:

  • feeding a water stream through a desalination process to produce a byproduct stream, the byproduct stream containing dissolved calcium ions and sulfate ions;

    contacting the byproduct stream with a cation-removal device and an anion-removal device to remove a substantial portion of the calcium ions and the sulfate ions, the calcium ions passing into a first salt stream, the sulfate ions passing into a second salt stream, the first salt stream containing chlorine ions, the second salt stream containing sodium ions;

    separately feeding the first salt stream and the second salt stream to a calcium sulfate precipitation chamber for precipitating calcium sulfate; and

    collecting the precipitated calcium sulfate.

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