PILOTSKALEFÖRSÖK MED NITRIFIERING AV REJEKTVATTEN MED SBR-TEKNIK PÅ BROMMA RENINGSVERK / Pilot Plant Scale Investigations of Nitrification of Sidestreams with SBR Technology at Bromma Sewage Treatment Plant
A pilot plant scale investigation of nitrification of sidestreams from centrifugation of digested sludge was carried out at Bromma sewage treatment plant in the beginning of 1991. The SBR technology (Sequencing Batch Reactor technology) was implemented. The investigations, which have been carried out, showed that the SBR technology is appropriate for nitrification of sidestreams. Complete nitrification of ammonia nitrogen was achieved with a high rate of more than 10 g N/kg VSS•h. At the same time the sludge had very good sedimentation properties which made it possible to keep high sludge concentrations (5,000-9,000 mg/1) in the treatment tank. This determinates high efficiency of the SBR plant. The conditions at the Bromma plant with extra capacity in the anoxic zones and good possibilities to use an existing thickener as batch reactor, convince the application of nitrification of sidestreams with SBR technique followed by denitrification in the existing anoxic zones in the biological stage.