At the Bromma sewage plant in Stockholm a project is being carried out where the aim is to elaborate different operational strategies for the plant. One of the strategies, the seeding of nitrificating bacteria from one line to other lines in the activated sludge process, was simulated with the assistance of the Danish computer program EFOR. The simulations showed that it was possible to use EFOR for this kind of simulation and that the seeding effect which was achieved in the sewage plant was of relatively small importance for reducing the NH4-N in the effluent water.

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