TERTIARY TREATMENT OF COLD AND HOT WATER IN APARTMENT HOUSES AND CLUSTERS OF ST. PETERSBURG

Introduction. Neva River is the source of water supply of St. Petersburg. The physical and chemical properties of its water are unstable. Therefore, due to corrosion in distribution networks of both cold and hot water supply it is not always possible to provide the consumers with high-quality water, particularly in terms of organoleptic indicators and content of iron. Russian housing market now includes a considerable share of comfort class estate characterized by low water intake and considerable breaks in water consumption. Thus, the beginning of consumption demonstrates such quality of cold, and especially hot, water that does not meet the organoleptic requirements of Sanitary Regulations and Norms (SanPiN 2.1.4.1074-02). Methods. The paper provides data on stabilization processing of tap water by filtering through the fractioned natural materials: calcite, dolomite and sorbent of «MS»; technological schemes of installations of tertiary treatment and possible structure of their equipment and technical characteristics. The study presents test results and water samples for hot water distribution in house networks of two different designs: one with polypropylene pipes and partial use of carbon steel fittings and connecting elements and the other one built completely from corrosion-resistant materials. Results. Improvement of quality of cold and hot water in apartment houses is possible by application of local installations of tertiary treatment of cold and hot water and use in the parting networks of pipelines of polymeric materials, shut-off and control valves, connecting elements of polymeric materials and alloys of non-ferrous metals.