The effect of flocculation/ultrafiltration combined process based on ceramic ultrafiltration membrane on the treatment of micro-polluted surface water was studied.The experimental results show that both the dosage of flocculant and the temperature of raw water are the key factors affecting the treatment capacity of the system.The temperature and the flux of water production show a linear trend,that is,the flux of water production decreases about 2.98 L/(m2·h)when the temperature decreases by 1 ℃.The transmembrane pressure is also a key factor affecting the flux.Higher transmembrane pressure increases the membrane flux,but also causes the rapid formation of periodic intimal pollution.The pilot test results show that the effluent turbidity of flocculation/ultrafiltration combined process is 0.1 NTU,the turbidity removal rate is 98.8％,the permanganate index removal rate is 14.02％,and the microbial index meets the sanitary standard of drinking water.In addition,the system maintains good performance in long-term operation,and the average membrane water production flux can reach 155 L/(m2·h)at a constant pressure of 0.1 MPa.The application of the combined flocculation/ultrafiltration process in surface water treatment is realized,and the high treatment flux and water quality are guaranteed.
关键词
陶瓷超滤膜/絮凝/微污染地表水/产水通量
Key words
ceramic ultrafiltration membrane/flocculation/micro-polluted surface water/water production flux
维普
万方数据