Technology of Contact Clarification of Water under Conditions of the Volga Water Intake of the City of Kazan

Summary

The results of laboratory studies and pilot tests of the contact coagulation method used to clean the water of the Volga at the water supply station of Kazan are presented. It is established that water clarification can be performed by a one-stage scheme: by means of contact coagulation, and in the process the quality of the purified water fully meets the regulatory requirements. Some advantage of aluminium oxychloride over aluminium sulphate is noted, and it is shown, that for natural water treatment the polyacrylamide flocculants of cationic type, FO 4140 characterised by low density of charge in particular, are the most effective.

Key words

disinfection , water intake , water treatment , coagulant , flocculant , contact clarification