Abstract
The development of the Main Treatment Plant Vienna-Simmering for 2,5 million population equivalent, which was recently put into operation, is described. The biological stage is a high rate activated sludge process at 1,2 days sludge age and 1,5 h average nominal hydraulic detention time. In a pilot Scale study, the design criteria for the biological stage were fully confirmed and indicated that the required purification efficiency (70 %) could readily be achieved (88 %) . Sludge disposal is undertaken by gravity thickening, centrifugation and incineration. A comprehensive analysis of the present operation of the process has showed that the plant has fully met expectations.
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