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Method of pretreating raw water for reverse osmosis units

  • US 4,261,833 A
  • Filed: 05/19/1980
  • Issued: 04/14/1981
  • Est. Priority Date: 05/18/1979
  • Status: Expired due to Term
First Claim
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1. A method of pretreating raw water intended for supplying reverse osmosis units, said method including the steps of:

  • mixing with said raw water an aqueous solution, of acid salt and acid having the same anions, for the purpose of adjusting the pH value of said raw water to the value most advantageous to said reverse osmosis, and for converting said acid salt into flakes of the corresponding hydroxide;

    centrifuging said solution to strongly concentrate said hydroxide flakes and to separate them from said solution;

    redissolving said hydroxide flakes, along with fresh metallic salt, by means of said acid, as salt;

    mechanically purifying said last mentioned solution solution in a second centrifuge;

    repeating with this solution said steps of mixing said solution with said raw water and subsequently centrifuging said flakes and withdrawing said pretreated raw water; and

    withdrawing said pretreated raw water from said centrifuge-separator under pressure.

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