Drinking Water Treatment by Combination of Coagulation and Ultrafiltration

Experiment on drinking water treatment by combination of ultrafiltration and coagulation using Taihu Lake water as raw water was carried out.Results showed that the pollution on the membrane surface could be effectively reduced by adding coagulant,and transmembrane pressure(TMP) was recovered to positions where last cycle started every time by backwashing.Pollutants on membrane surface could be effectively cleaned up by regular chemical cleaning.After a long period running,the integrity of membrane was good,without break in module.The removal efficiency of turbidity was above 99.5%,TOC 45%~50%,UV254 43%~45% and total Fe above 90% as well as total recovery of raw water was around 87%.The quality of UF filtrate satisfied the standard for drinking water quality of GB5749-2005.