| Abstrakt: |
In recent years, the application of moving bed biofilm reactor (MBBR) in the biological treatment of municipal and industrial wastewater has been developed. Herein, following the construction of the MBBR reactor, the effect of three important parameters of temperature, hydraulic retention time (HRT), and pH simultaneously on the MBBR efficiency was investigated. The effluent wastewater of the anaerobic unit of Kanyar Dairy Company located in Quchan – Iran was treated as the model wastewater. Response surface methodology was applied to design the experiments of system operating conditions. The analysis of variance was applied to determine the most important parameters affecting the performance of the MBBR reactor in order to increase the chemical oxygen demand (COD) removal percentage. The amount of COD was measured as the process response. Based on the results and the analysis of variance, the response of the experiments was in accordance with the predicted model. The p-value in all the three parameters of temperature, HRT, and pH was less than 0.05, therefore making them important while having a significant effect on the performance of the reactor. Moreover, only the interaction of HRT and pH affects the performance of the reactor and should be controlled. Under the optimal conditions (pH = 7, temperature = 27°C, and HRT = 11 h), COD removal efficiency reached 93%. According to the results, an optimized MBBR is a good option for dairy wastewater treatment. |
