Efficiency Comparison of Different Ultrafiltration Processes for Treatment of Reservoir Water Derived from Yellow River

The internal pressure polysulfone ultrafiltration membrane and the external pressure PVC ultrafiltration membrane were applied respectively in a pilot-scale system at the Dongying Nanjiao Waterworks.Pretreatment processes at the waterworks included pre-oxidation,powdered activated carbon adsorption,coagulation,sedimentation and sand filtration.The contaminant removal performance of two ultrafiltration processes and the different effects of membrane fluxes on membrane fouling were compared.The turbidity of the effluents from two ultrafiltration processes was below 0.02 NTU and the average number of particles larger than 2 μm was about 10 p/mL.Significant removal efficiency of CODMn and TOC was achieved by coagulation,sedimentation,sand filtration and ultrafiltration with the multiple barrier effect.But the removal of UV254 by sand filtration and ultrafiltration was limited.The removal efficiency of all indexes was not strongly dependent on the membrane material or the filtration form.Membrane fouling and trans-membrane pressure reduction of micro-polluted Yellow River reservoir water could be effectively improved by direct ultrafiltration after the pretreatments of pre-oxidation,powdered activated carbon adsorption,coagulation and sedimentation.