Deep Shaft
Deep Shaft : A high-intensity biological treatment process for purifying domestic sewage and biodegradable industrial effluents. The waste is circulated very rapidly through a vertical loop reactor, 30 to 150 m in height, usually installed underground. Compressed air, introduced at the middle of both legs, drives the circulation. Because of its rapid movement, the sludge operates at a much higher density than is normal in Activated Sludge plants
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