The Deep-Shaft Process: Bright Future for Treating High-Strength Wastewaters

by Eugene E. Dallaire, Civil Engineering Magazine, New York, NY 10017,

Serial Information: Civil Engineering—ASCE, 1981, Vol. 51, Issue 5, Pg. 74-76

Document Type: Feature article


A Deep-Shaft wastewater treatment process may reduce by 10 to 30 percent the power requirements and land area needed for a plant. The technique is most attractive for treating high-BOD industrial wastewaters. Raw sewage or other wastewater enters a deep shaft where air is continuously bubbled under high pressure, at a point 40 percent of the way down the shaft. The high water pressure near the bottom of the shaft forces all the air bubbles into solution, providing a rich oxygen supply for bacteria to use in breaking down the wastes. The effluent from the shaft goes to a flotation clarifier where the dissolved air bubbles out of the wastewater, carrying suspended particles to the surface at the same time. The first full-scale test is now being carried out in Ithaca, N.Y.

Subject Headings: Shafts | Industrial wastes | Water pressure | Wastewater treatment plants | Wastewater management | Power plants | Water supply

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