Abstract
Water rinsing could effectively alleviate polysaccharides fouling in membrane bioreactor. To understand water rinsing mechanism, a suitable model was developed to depict the variation of fouling resistance during water rinsing process with different microfiltration membranes and feed solution/suspensions at different operation conditions. Various parameters including contact angle, Zeta potential, the roughness and the free energy of the membrane surface were measured or calculated to assess membrane properties. The results showed that the membrane flux was more sensitive for temperature than agitation velocity and operating pressure during water rinsing process. The membrane flux initially increased before decreasing over time due to shearing effect (removing the deposits from the membrane and forcing small cells into the pores). The predictive values of the model had a good agreement with experimental observations (R2 >0.94). Further, the model allows predicting the resistance due to deposit at the membrane surface and in-pore fouling, respectively.
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