A better efficiency of the reservoirs of water is a prerequisite to meet the arising requirements. The order of application of the water-reservoirs in the GDR in dry a tmospheric conditions is 90 a, ', , and in normal atmospheric conditions about 44 o/o, (REICHELT). A better application of the water will be reached by intensifying the clarification plants whereby the energy consumption will be reduced simultaneously. I n 1980 the energy consumption was 570000 kWh for 106 m3 of sewage.The behaviour of the current of the aqueous phases in two biological clarification plants with different operating conditions was studied using radio-tracer techniques. ( K~N N E C K E ,OTTO and HECHT; OTTO e t al.) The task was to improve the run of the process. The schemes of both the examined clarification plants are given in fig. 1. The clarification plant I consists of two settling pools, pool I being furnished with a n airing impeller was working like an activated sludge chamber. The volume of inlet was 730 m3/h, the velocity of flow into pool I averaged 50 cm/s, t'hat into pool I1 100 cm/s. 30*

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