The largest sugar mill in Austria is situated on a small creek (100-200 1/s) and the waste water, which has a flow of up to 45000 m3/d, is treated in a low loaded activated sludge plant with a selector. The installed plant consists of a 6700 m3 capacity primary sedimentation tank, a 400 m3 selector (coarse bubble aeration tank), a main aeration tank of 16000 m3 capacity equipped with 16 mammoth rotors each 9 m long and a final settling tank.

The plant has operated very reliably since it started to run in the campaign of 1984.

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