The treatment performance comparison of batch flow reactor and continuous flow stirred reactor

In this study, the synthetic wastewater is treated with activated sludge method using a completely mixed continuous flow stirred tank reactor and a batch flow reactor. Both reactors are operated under 2000 mg/L, 4000 mg/L and 5000 mg/L MLSS activated sludge concentrations and 6, 12, 18, 24 and 30 hour hydraulic retention times. During the operation of both systems COD removal efficiency, SVI and MLSS concentration are checked up and compared. Oxygen concentration is chosen to minimize energy consumption and sludge production. For completely mixed continuous flow stirred tank reactor and batch flow reactor, the F/M ratio and oxygen concentration are kept over 0,05-1 mgCOD/mgMLSS.day and 2 mg/L. These parameters are checked during the operations. The inflow COD concentrations of both systems are 350+-20 mg/L. The COD removal performances of both systems are changed between 85% and 95%.Moreover, by using batch flow reactor, 50 minute aeration was carried out. The changes of COD value within 50 minute of aeration were observed and the results were applied whether it is fit to reaction kinetics or not. Batch flow reactor system is operated with 1000 mg/L, 2000 mg/L, 3000 mg/L, 4000 mg/L, 5000 mg/L and 6000 mg/L MLSS activated sludge concentrations and 5, 10, 15, 20, 30, 40, 50 minute of aeration periods. The short term COD removal efficiencies are applied to the reaction kinetics (zero order, first order, reaction order, Elovich, ?fractional power?, second order, pseudo second order type1, type2, type3 and type4). COD removal efficiencies changed between 74% and 82% by application of COD concentration 250+-10 mg/L. Time-dependent changes in COD removal efficiencies fit first order, reaction order, Elovich, ?fractional power?, second order, pseudo second order type 1 reaction kinetic models.