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A SINGLE-STAGE PROCESS AND APPARATUS FOR CONTINUOUS INTRO- DUCTION OF OXYGEN-CONTAINING GASES INTO EFFLUENT CONTAINING ACTIVATED SLUDGE
A SINGLE-STAGE PROCESS AND APPARATUS FOR CONTINUOUS INTRO- DUCTION OF OXYGEN-CONTAINING GASES INTO EFFLUENT CONTAINING ACTIVATED SLUDGE
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机译:单级过程和装置,用于将含氧气的气体连续引入含活性污泥的废水中
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摘要
In activated sludge-containing wastewater from sewage treatment plants, oxygen is absorbed and consumed. Oxygen-containing gas, having at least 50% by volume of O2, at a hydrostatic pressure of 0.9 to 4 bar is passed in to a wastewater tank (10). The liquid height in the clarification tank (10) is 10 to 40 m. The gas pressure is 0.01 to 0.5 bar above the hydrostatic pressure at the gas introduction positions (12, 14), each of which has an aerated surface of 0.1 to 0.5 m2. Each gas introduction position (12), which is a bundle of a plurality of injectors, ejectors or nozzles or an orifice plate, is charged with 100 to 300 effective cubic metres of gas per m2 of cross-sectional area and hour. The individual gas introduction positions (12) have a mutual central spacing of 2 to 10 m. The process permits the optimal utilisation of oxygen with single-stage operation. IMAGE
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