BROMMA RENINGSVERK – ERFARENHETER AV RENING FÖRSTA ÅRET EFTER OMBYGGNAD / Bromma Sewage Treatment Plant – Experiences from the Treatment during the First Year after Reconstruction
After the Bromma sewage treatment plant was enlarged and reconstructed, the operation of the plant has been improved. Temporary requirements concerning the effluent are applied today until the final decision of the environmental authorities. The requirements are presented below together with the appropriate result from 1985. It is rather difficult to reach a complete nitrification simultaneously with good phosphorus removal. For nitrification the sludge age has to be high, which also implies a high concentration of MLSS (mixed-liquor suspended solids). Then much of the phosphorus in the sludge is released to the water when the MLSS is mineralized and the phosphate phosphorus concentration in the effluent increases. The result of the operation is a compromise governed by the requirements of nitrification and phosphorus removal. “Complete abstract not presented.”