Comparing with coagulation membrane filtration(C-MF) process

the circulating flocculation membrane filtration (CF-MF) process is a combination of circulating contact flocculation with membrane filtration. The differences of membrane fouling development in the two processes were investigated in this study. SUVA was used as an evaluation index of hydrophilic/hydrophobic properties for organic matters to assess the effect of process variation on SUVA as well as to find relation between SUVA and index of comprehensive membrane fouling. The results indicated that there exists a good liner relationship between SUVA in membrane filtration and membrane fouling. The higher SUVA was

the more serious membrane fouling was. In the optimal operation conditions

SUVA in membrane filtration effluent and coagulation process supernatant were 1.74 L·mg-1·m-1 and 1.18 L·mg-1·m-1 for CF-MF process

the removal of organic matters increased by 17% and 29%

comparing with C-MF process

indicating that the removal of hydrophobic organic matters and the control of fouling formation on membrane from them was better for CF-MF than C-MF. Comparing with C-MF process

the CF-MF is more effective for removing organic matters. With coagulant dosing of 6 mg·L-1 and reflux floc concentration of 10 mg·L-1

the removal rate of UV254 and DOC were 58.75% and 49.7% respectively.