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Method of treating water with an inorganic powder reagent

  • US 7,678,278 B2
  • Filed: 09/29/2006
  • Issued: 03/16/2010
  • Est. Priority Date: 09/29/2006
  • Status: Active Grant
First Claim
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1. A method of treating water using a dual ballasted flocculation system, comprising:

  • a. directing the water into a first ballasted flocculation system including a first treatment tank and a first clarifier disposed downstream from the first treatment tank;

    b. directing the water into the first treatment tank and injecting a flocculent and ballast into the first treatment tank to form flocs;

    c. directing the water containing flocs from the first treatment tank into the first clarifier, settling the flocs, and clarifying the water;

    d. directing the flocs from the first clarifier to a first separator and separating the ballast from the flocs and recirculating at least a portion of the ballast into the first treatment tank;

    e. after clarifying the water, directing the water from the first ballasted flocculation system to a second ballasted flocculation system including a second treatment tank and a second clarifier;

    f. in the second treatment tank adding powdered activated carbon and ballast to the water and forming flocs containing powdered activated carbon;

    g. directing the water and flocs containing powdered activated carbon from the second treatment tank into the second clarifier and settling the flocs containing powdered activated carbon;

    h. directing the flocs containing powdered activated carbon from the second clarifier to a second separator and separating the powdered activated carbon from the flocs and recirculating a first portion of the powdered activated carbon into the second treatment tank.

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