SURFACE SOURCE WATER PURIFICATION USING MIXED COAGULANTS
The data of laboratory studies on the effectiveness of mixed coagulants based on aluminum sulfate, aluminum oxychloride «AQUA-AURAT 30» and cationic organic coagulant FL 45, used for the treatment of Sura water during the flood period are given. An increase in the time of mixing the initial water with mixed coagulants from 2 to 10 minutes improves the quality of its purification in comparison with the use of mineral coagulants. The most significant results on reducing turbidity, color and permanganate oxidizability of river water after sedimentation and filtration were obtained using a mixed coagulant based on aluminum sulfate and FL 45 with a ratio of organic and mineral parts equal to 1:4. At a mixing time with the initial river water of 10 minutes, the use of this mixed coagulant allows to reduce the required doses of aluminum sulfate by 16-17 % without deteriorating the quality of purified water.