Performance and modeling of moving bed biofilm process for biological nutrients removal from municipal wastewater

Experiments have been conducted to evaluate the nutrient removal from synthetic wastewater by a lab-scale moving bed biofilm process. Also, kinetic analysis of the process with regard to phosphorus and nitrogen removal has been studied with different mathematical models. For nutrient removal, the moving bed biofilm process was applied in series with anaerobic, anoxic and aerobic units in four separate reactors that were operated continuously at different loading rates of phosphorus and nitrogen and different hydraulic retention times. Under optimum conditions, almost complete nitrification with an average ammonium removal efficiency of 99.72% occurred in the aerobic reactor. Denitrification rate increased with increasing NOx-N loading in the second anoxic reactor. The aerobic phosphate removal rate showed good correlation with the anaerobic phosphate release rate. Under optimum conditions, the average total nitrogen and phosphorus removal efficiencies were 80.9% and 95.8%, respectively. As a result of the MBBR kinetic analysis, the Stover-Kincannon model was chosen for modeling studies and experimental data analysis. The Stover-Kincannon model gave high correlation coefficients for phosphorus and nitrogen removal, which were 0.9862 and 0.986, respectively. Therefore, this model could be used in predicting the behavior or design of the moving bed biofilm process.

کلیدواژه ها:

Bioreactor ، Biofilm Carriers ، Biological Nutrient Removal (BNR) ، Sewage Treatment ، Stover-Kincannon Model