OPTIMIZATION OF A TWO-STAGE SEQUENCING BATCH REACTOR (TSSBR) FOR BIOLOGICAL NITROGEN REMOVAL
Activated sludge. Two-stage Sequential Batch Reactors. Biological nitrogen removal. Optimization.
Activated sludge Sequential Batch Reactors (SBR) have been increasingly employed in biological nitrogen removal with higher operational stability compared to continuous flow systems. However, SBR are not always operated under the most appropriate operating conditions, especially in tropical climate regions. The present work aims to model and optimize a two-stage SBR system in order to obtain the best operating conditions that favor the removal of nitrogen in hot climate regions. To do this, a pilot unit of the two-stage RBS system will be operated treating domestic sewage. Initial bench-scale respirometric experiments and physical-chemical analyzes will be carried out to determine the COD and nitrogen fractions of the affluent and the kinetic constants of nitrification in the system. Thus, the modeling of the nitrification and denitrification processes will be performed to find the operational conditions, especially the sludge age, that result in the maximum removal of nitrogen. Subsequently, the validation will be carried out by monitoring the system under the optimum conditions found, followed by the comparison of the experimental results with the values estimated by the model.