Comparative Evaluation of Ultrafiltration Plant at Treatment of Water of Lake Ladozhskoye and Aftertreatment of the Neva’s City Water.

Summary

The comparative evaluation of operation of two industrial ultrafiltration plants with the same design and output and intended for treatment of water from one source is made. The practical experience of operation shows that the restoration of operational characteristics of membrane operating in water containing a bulk of polluting substances (taken from Lake Ladozhskoye directly) takes place according to standard methodology with the use of alkali solution of sodium hypochlorite and hydrochloric acid. The use of these reagents for restoration of operational characteristics of membranes aftertreating Lake Ladozhskoye water after their preliminary treatment at city water supply facilities of St. Petersburg (the Neva’s city water) was inefficient. Results of the study aimed at determination of reasons for rapid pollution of ultrafiltration membranes operating at aftertreatment of the Neva’s city water as well as methods developed for restoration of their operational characteristics are presented.

Key words:

ultrafiltration membrane , back and chemical wa¬shings , restoration of operational characteristics , transmembrane pressure