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  • Title: CFD simulation and optimization of membrane scouring and nitrogen removal for an airlift external circulation membrane bioreactor.
    Author: Yang M, Wei Y, Zheng X, Wang F, Yuan X, Liu J, Luo N, Xu R, Yu D, Fan Y.
    Journal: Bioresour Technol; 2016 Nov; 219():566-575. PubMed ID: 27540633.
    Abstract:
    Cost-effective membrane fouling control and nitrogen removal performance are of great concern in airlift external circulation membrane bioreactors (AEC-MBRs). Computational fluid dynamics (CFD) model incorporating sub-models of bio-kinetics, oxygen transfer and sludge rheology was developed for the cost-effective optimization of a lab-scale AEC-MBR. The model was calibrated and validated by extensive measurements of water velocities and water quality parameters in the AEC-MBR. The validated results demonstrated that the optimized height of gas-liquid dispersion was at around 300mm. The shear stress on membrane surface was equalized and had an average value of 1.2Pa under an air flowrate of 1.0m(3)h(-1). The model further revealed that the high nitrogen removal efficiency (>90%) was achieved due to the high recirculation ratio driven by airlift force without destroying the oxygen deprivation and enrichment in the anoxic and oxic zone, respectively.
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