Features of water purification from Vuoksa river during the summer period

Purification of water from the river Vuoksi of the Karelian Isthmus of Russia to drinking water quality is important and serious problem.

Fluctuations in the composition of these waters in the summer, not only related to the hydrometeorological situation, but with increasing human influence on the ecosystem of the river Vuoksi greatly complicate usually adopted for such waters coagulation treatment.

The instability of such indicators of these waters, as alkalinity, permanganate oxidation and content of hydrocarbons led to the application in the standard scheme of the coagulation treatment by aluminum sulfate, the second correction batcher solution of alkali.

Such approach has allowed to ensure optimum coagulation, however, demanded constant monitoring the water parameters, which is associated with considerable costs.

The scheme of two batchers made it possible to use a aluminum oxychloride as a coagulant, which did not give satisfactory coagulation in these conditions without adjustment.

Treatment plant has also been supplemented by sorption filters (activated carbon and natural zeolite), which allowed to eliminate odors and flavors, as well as impurities Fe2 +, Mn2 + and Zn2 +, admitted to the source water from corroding steel (Zn) pipeline in significant amounts (0.6 - 3.6 mg / L), which were not eliminated by conventional coagulation scheme.