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Process and apparatus for purifying impure water using microfiltration or ultrafiltration in combination with reverse osmosis

  • US 20070181496A1
  • Filed: 03/24/2005
  • Published: 08/09/2007
  • Est. Priority Date: 03/26/2004
  • Status: Active Grant
First Claim
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1. A method of purifying impure water contaminated with a filterable impurity and a dissolved impurity, the method comprising the steps of:

  • providing impure water to a primary microfiltration or ultrafiltration unit to remove the filterable impurity and produce impure filtered water contaminated with a dissolved impurity;

    providing the impure filtered water contaminated with a dissolved impurity to a reverse osmosis unit to produce a potable water stream and a residual reverse osmosis stream; and

    treating the residual reverse osmosis stream prior to reuse.

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