Abstract: Effects of a few drinking water treatment processes on the water from a certain lake have been researched and compared.The results have shown that the processes being composed of bio ceramic process or ozonation+bio ceramic process as pretreatment have performed better than that being used by a potable water plant,so do the removal rates to NH 3 N,Chla,Colourness,Turbility,et al.by flexibly organized processes including preozonation,bio ceramic,flocculation and sedimentation,sand filter,and granular a...