MODELING OF THE CARROUSEL PLANT

The results of experimental and mathematical modelling of simultaneous processes of organic and nitrogen impurities removal in an industrial Carrousel wastewater treatment plant are presented. The hydrodynamic regime measurements in the full-scale Carrousel system have led to the conclusion that at least three hydrodynamic models such as tank-in-se ries, ideally mixing reactor with aerobic and anoxic volume and comple tely mixing reactor with an intermittent aeration, are suitable to des cribe the dynamic behaviour of this bioreactor. The tank-in-series and the intermittently aerated completely mixing equipments were used in lab-scale modelling of the Carrousel plants. Various kinetic models an d a statistical approach were applied to the evaluation of laboratory and full-scale data. The simplified kinetic model proved to be conveni ent for the process control purposes due to the significant computatio nal time reduction in model parameters determination in comparision to tank-in-series hydrodynamic modelling. Also, the statistical model is very suitable approximation of the processes carried out in the Carro usel system, The completely mixing bioreactor with intermittent aerati on is advantageous for experimental simulation of simultaneous nitrifi cation and denitrification processes performed in high-rate recycled a ctivated sludge systems. The influence of wastewater substances on oxy gen transport rate is implicitly incorporated through aerobic and anox ic 'switching functions' evaluated based on oxygen profile data monito red in the bioreactor when applying the modified IAWPRC kinetic model.