The fouling mechanisms of the homogeneous enhanced aromatic poly(m-phenyleneisophthalamide) (PMIA) hollow fiber membranes were determined by experimental data fitting to pore blocking model or cake fouling model

and combined with the membrane pore size distribution

particle size distribution of filter mediums and the membrane resistance distribution during ultrafiltration. Three materials (CaCO3 suspension

activated sludge and BSA solution) which could induce fouling were used to be filter mediums. In addition

homogeneous enhanced PMIA hollow fiber membranes were applied to membrane bioreactor (MBR) system to deal with domestic sewage. At the meantime

the cleaning effects of water and chemical were analyzed by field emission scanning electron microscopy (FESEM)

and the change of quality fraction of inorganic elements after fouling and cleaning of membrane outer surface was performed by energy dispersive X-ray spectrometer (EDX). The results showed that when the filter medium was BSA

the linear correlation coefficient (t-t/V) was 0.9940. Thus

the main type of the membrane fouling in ultrafiltration of BSA solution was attributed to pore blocking. Owing to the linear correlation coefficient(V-t/V) was 0.9733 and 0.9994

respectively

the membrane fouling caused by CaCO3 suspension and activated sludge was conformed to cake layer formation. Moreover

the MBR operating results showed that the average removal of COD

NH4+-N and TP was up to 97.78%

96.71% and 49.81%

respectively

being beneficial to improve the effluent quality. Furthermore

the chemical cleaning experiment demonstrated that the kinds of inorganic elements of the membrane outer surface were close to the original film. The pollutants were easier to be removed by chemical cleaning.