Processes and compositions for water treatment

  • US 20040040912A1
  • Filed: 09/17/2003
  • Published: 03/04/2004
  • Est. Priority Date: 10/27/2000
  • Status: Active Grant
First Claim
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5. A process for treating water containing dissolved inorganic substances, comprising the steps of (i) adding a first amount of neutralised bauxite refinery residue to said water in an amount sufficient to decrease the concentration of at least one inorganic substance in said water;

  • and (ii) adding a second amount of neutralised bauxite refinery residue to said water in an amount sufficient to decrease the concentration of at least one of said inorganic substances to below a predetermined level;

    wherein in at least one of step (i) and step (ii), said neutralised bauxite refinery residue is added to said water together with one or more water treating additives; and

    wherein said neutralised bauxite refinery residue is red mud that has been treated with seawater, saline ground water or other water containing sufficient calcium and magnesium ions to react with substantially all of the hydroxide, carbonate, fluoride and oxalate ions present in the red mud, and for a time sufficient for the red mud to exhibit a reaction pH of less than 10.5, in a standard soil test when 1 part by weight of the neutralised red mud is mixed with 5 parts by weight of distilled or deionised water.

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