Membrane filtration technology combined with coagulation is widely used to purify river water. In this study

microfiltration (MF) and ultrafiltration (UF) ceramic membranes were combined with coagulation to treat local river water located at Xinghua

Jiangsu province

China. The operation parameters

fouling mechanism and pilot-scale tests were investigated. The results show that the pore size of membrane has small effect on the pseudo-steady flux for dead-end filtration

and the increase of flux in MF process is more than that in UF process for cross-flow filtration with the same increase of cross-flow velocity. The membrane pore size has little influence on the water quality. The analysis on membrane fouling mechanism shows that the cake filtration has significant influence on the pseudo-steady flux and water quality for the membrane with pore size of 50

200 and 500 nm. For the membrane with pore size of 200 nm and backwashing employed in our pilot study

a constant flux of 150 L·m

-2

·h

-1

was reached during stable operation

with the removal efficiency of turbidity

total organic carbon (TOC) and UV254 higher than 99%

45% and 48%

respectively. The study demonstrates that coagulation-porous ceramic membrane hybrid process is a r

eliable method for river water purification.