Downflow Bubble Contact Aeration

by Richard E. Speece, (M.ASCE), Prof. of Envir. Health Engrg.; Univ. of Texas at Austin, Austin, TX,
Marcos Madrid, (A.M.ASCE), Commissioned Ofcr.; U.S. Air Force, Colorado Springs, CO,
Kenneth Needham, (A.M.ASCE), Commissioned Ofcr.; U.S. Air Force, Fort Worth, TX,


Serial Information: Journal of the Sanitary Engineering Division, 1971, Vol. 97, Issue 4, Pg. 433-441


Document Type: Journal Paper

Abstract: A simple system has been developed to efficiently absorb commercial oxygen and air into water. It consists of passing water down through a submerged cone-shaped hood. Oxygen or air is injected into the hood. The water velocity entering the smaller, top end of the hood is greater than the buoyant velocity of the bubbles. The water velocity leaving the larger, open bottom is less than the buoyant velocity of the bubbles. Thus, the bubbles are trapped inside the hood for efficient absorption. Oxygen absorption in excess of 90% was achieved with very low power input. The system has potential application in activated sludge, river reaeration, fish hatcheries, yeast production and hypolimnion aeration.

Subject Headings: Fluid velocity | Oxygen | Aeration | Buoyancy | Absorption | Water conservation | Submerging | Activated sludge

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