EFFECTS OF WEIGHTING AGENTS AND SEEDED NITRIFICA- TION BACTERIA ON THE ACTIVATED SLUDGE PROCESS – EVALUATION BY USE OF SIMPLE MODELS / Effekter av tyngande material och inympade nitrifikationsbakterier på aktivslamprocessen – Utvärdering med hjälp av enkla modeller
Many possibilities are available to improve the efficiency of the activated sludge process and to decrease the necessary volume needs. Examples include the use of dosage of weighting agents and seeding of nitrification bacteria to the activated sludge process. Simple models were developed in order to predict the effects of these methods. One model was developed for activated sludge sedimentation based on the solids flux theory and Vcsilind’s formula. Seeding effects were described by use of a steady state model. The sludge age for nitrification bacteria in seeding can be much higher than the measured sludge age for the activated sludge.