Aeration system and method with tapered nozzle
First Claim
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1. A system for aerating waste water in a body of waste water comprising:
- at least one mixing chamber adapted for immersion in said body for providing a waste water passage, including;
an extending chamber;
a liquid passage for guiding waste water flow into said extending chamber, the cross-sectional area of the liquid passage at the entry to said extending chamber being less than the cross-sectional area of said extending chamber at that entry so as to form a step region, and said extending chamber including a first section extending from said step region and a second inwardly tapered section extending from said first section, shorter than said first section along the direction of water flow and tapering inwardly at a rate greater than any inward taper of said first section so as to maintain mixing within said extending chamber over a wide range of gas flow rates; and
means defining at least one gas passage terminating in said step region for injecting gas into said extending chamber, to form parallel gas and water streams, said extending chamber extending downstream from said gas passage for confining flow of the parallel gas and water streams for a distance until the interface between said streams becomes unstable in said extending chamber and vortices are tripped to produce gas bubbles which are mixed with the water stream;
means for pumping said waste water through said at least one mixing chamber;
means for mounting said mixing chamber below the surface of said body of water; and
means for injecting an aerating gas into waste water within said mixing chamber.
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Abstract
An improved system for mixing gas with waste water in which the water is pumped through a plurality of mixing chambers into which the gas is injected at a step region to form parallel streams of gas and water. An extending chamber contains the parallel streams as the interface between them becomes unstable, breaks down creating vortices and produces tiny bubbles which mix with the water. The extending chamber is divided into two sections with at least the section remote from the step surface tapered inwardly at a rate of 11°-22° to permit operation at higher air flow rates without blowing the bubble forming vortices out of the chamber.
39 Citations
7 Claims
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1. A system for aerating waste water in a body of waste water comprising:
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at least one mixing chamber adapted for immersion in said body for providing a waste water passage, including; an extending chamber; a liquid passage for guiding waste water flow into said extending chamber, the cross-sectional area of the liquid passage at the entry to said extending chamber being less than the cross-sectional area of said extending chamber at that entry so as to form a step region, and said extending chamber including a first section extending from said step region and a second inwardly tapered section extending from said first section, shorter than said first section along the direction of water flow and tapering inwardly at a rate greater than any inward taper of said first section so as to maintain mixing within said extending chamber over a wide range of gas flow rates; and means defining at least one gas passage terminating in said step region for injecting gas into said extending chamber, to form parallel gas and water streams, said extending chamber extending downstream from said gas passage for confining flow of the parallel gas and water streams for a distance until the interface between said streams becomes unstable in said extending chamber and vortices are tripped to produce gas bubbles which are mixed with the water stream; means for pumping said waste water through said at least one mixing chamber; means for mounting said mixing chamber below the surface of said body of water; and means for injecting an aerating gas into waste water within said mixing chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification