Abstract
Within this research project a number of high strength organic waste waters was treated in anaerobic-aerobic working bench scale units and in small scale pilot plants. By this study problems with the anaerobic-aerobic technology should be solved, dimensioning parameters should be worked out, and the economy should be focused. For most of the sewages the anaerobic-aerobic treatment turned out to be possible although sometimes technical problems could be observed. Such problems occurred in the final aerobic stage in connection with wastes with a high content of N. They could be solved by a predenitrification stage. Fibreboard sewage was taken as an example for wastes containing persistent substances; different anaerobic processes were tested, it turned out that a twostage anaerobic treatment is necessary to stabilize the process. The economic calculations proved the anaerobic-aerobic treatment to be preferable if some conditions are considered.
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