Pilot-scale Study on UF for Treating Micropolluted Reservoir Water

Micropolluted reservoir water was treated with the direct ultrafiltration process and the combined process of micro-flocculation and ultrafiltration. The experimental results show that the treated water quality by two kinds of ultrafiltration processes conforms to the requirements of Water Quality Standard for Urban Water Supply (CJ/T 206-2005) issued by the Ministry of Construction. The combined process of micro-flocculation and ultrafiltration is more effective than the direct ultrafiltration process, both in improving treated water quality and reducing membrane fouling. In the combined process, the optimum flocculation time is about 120 seconds; the optimum dosage of PAC is about 2 mg/L (calculated as Al_2O_3). With the same dosage (mol/L metal), the flocculation effect of iron salt is better than that of aluminium salt.