Patent ID: 6960294

Claim:
A dissolved gas floatation clarifier system to separate contaminants from wastewater by floatation, comprising: a first fluid mixer in fluid communication with a wastewater inlet, the first mixer adapted to mix coagulation agents with wastewater from the wastewater inlet; a second fluid mixer adapted to mix flocculating agents with a fluid exiting the first fluid mixer; a manifold adapted to mix a fluid exiting the second fluid mixer with water containing dissolved air; a dissolved gas floatation clarifier adapted to separate a fluid exiting the manifold into contaminants and clarified water, the clarified water passing through a passageway in the dissolved gas floatation clarifier to an outlet; and a recycle aeration system to supply clarified water containing dissolved air to the manifold, the recycle aeration system comprising a recycle pump to pressurize clarified water from the outlet of the passageway; and a recycle fluid mixer adapted to mix the pressurized clarified water from the recycle pump with atmospheric air; the recycle fluid mixer in fluid communication with the manifold to provide the clarified water containing dissolved air from the recycle fluid mixer to the manifold, wherein the recycle fluid mixer further comprises a dissolved gas generator having; an upper cylindrical donut housing with a fluid inlet the upper cylindrical donut housing having a gas separation chamber; a grooved ring having a plurality of grooves, the grooved ring being concentric to the upper cylindrical donut housing, the grooved ring having an outer diameter on a first end that is smaller than a diameter of the upper cylindrical donut housing, thus defining a distribution channel; a venturi-orifice ring; and a cylinder concentric with the grooved ring, the cylinder in fluid communication with the distribution channel via the grooves, a fluid outlet being located a bottom of the cylinder.