Patent ID: 7678278

Claim:
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.