Two stage wastewater flotation

Details Two stage wastewater flotation Two stage wastewater flotation

C - Chemistry, Metallurgy

02

F

362/62

C02F 1/00 (2006.01)

Patent

CA 1090491

TWO STAGE WASTEWATER FLOTATION Abstract of the Disclosure: In a first stage, a flow of wastewater is adjusted to near zero streaming potential by injecting a mineral acid into the wastewater. The thus adjusted flow enters a basin where it is subjected to a decreasing gradient of small bubbles to form and separate off a first buoyant floc from the flow of wastewater. The flow of wastewater than passes to a second stage. In the second stage, a metal coagulant is injected into the wastewater, and the wastewater and coagu- lant enter a coagulation cell into which dense quantities of bubbles are supplied. Buoyant composites of particulates, coagulant and bubbles are formed in the cell. These compos- ites leave the cell together with the wastewater flow and enter a second flotation basin where a second buoyant floc is separated off. The first and second floc combined have a higher solids content, have a lesser relative volume, and have physical properties such that valuable materials are more readily recovered therefrom than from a floc that would be formed if the wastewater were subjected tot he second stage only.

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