Author/Authors :
Sajjadi، Baharak نويسنده Department of Chemical Engineering, Faculty of Engineering, Arak University, Arak 38156-8-8349, Iran , , Keshavarz Moraveji، Mostafa نويسنده Department of Chemical Engineering, Faculty of Engineering, Arak University, Arak 38156-8-8349, Iran , , Davarnejad، Reza نويسنده Department of Chemical Engineering, Faculty of Engineering, Arak University, Arak 38156-8-8349, Iran ,
Abstract :
The paper describes the effect of temperature, ammonia concentration and feed flow rate on nitrifying treatment of wastewater usage Computational Fluid Dynamics (CFD) for two phase bubbly flow in a split cylindrical airlift reactor with a 0.085 m initiator diameter and 0.505 m height. Superficial gas velocity was used as the operational parameter, air was used as the dispersed phase, and wastewater containing ammonia was used as continuous phase. Temperature enhancement in a constant O2 and NH4+ concentrations, resulted the increase of reactions rate also NO2- had an increase of about 3 times as much. By the feed flow rate increase, O2 consumption increase and the rate of NO2- production increase more than NO3- but decrease the reactions efficiency decrease in a constant time. NH4+ concentration enhancement leads to the increase of O2 consumption and better reactions efficiency at higher NH4+ concentration, NO2- concentration increases more. Modeling results are compared with the experimental data. The CFD modeling results show suitable agreement with the experimental data.
