Pilot studies on treating Dong River water by submerged ultrafiltration membrane

With the pretreatment by coagulation-sedimentation, the best running condition for the treatment of Dong River water was investigated by submerged ultrafiltration membrane process in pilot equipment. When the air cleaning period was 24h, the membrane flux and the quality of enriched liquid were investigated. After 48h filtration, variations of membrane flux was smooth, and air cleaning was gradually losing effect. Except the 4 hours after air cleaning, the concentrations of main water quality parameters of enriched liquid were almost the same or lower than those of the inlet water of membrane equipment. On the basis of these, the variations of membrane flux were compared under three different running conditions. The running condition with 48h water cleaning period and 24h air cleaning period was the best. After running for 30 days, the average membrane flux reduced from 39.8L/(m2·h) to 30.3L/(m2·h).