An Improved Stepwise Method to Determine Critical Flux of Membrane Bioreactor by Adding Relaxation Zone

Abstract:

The critical flux of submerged flat membrane bioreactor (MBR) was measured by an improved fluxstepwise method and the measured values under different relaxation time were analyzed.The result was that with longer relaxation time,asymmetry of FluxTMP and FluxPermeability decreases remarkably with much lower membrane residual resistance and better fouling reversibility in subcritical flux zone and without obvious hysteresis.The relaxationzoneattached fluxstepwise method can better describe the principle of fluxpermeability and alleviate the impact of reversible fouling.

Key words:membrane bioreactor (MBR); critical flux; relaxation time; hysteresis effect