Influence of Deep-Treated Wastewater Discharge on Nitrification Activity in a Natural Reservoirs

Abstract

The data from regular monitoring of the concentration of nitrogen-containing compounds and nitrification indica-tors in the Udy river (at sites 500 m before the discharge of treated wastewater in Kharkiv city and 500 m after discharge downstream) and in the wastewater being treated at urban wastewater treatment facilities were analyzed. Chemical and biological kinetic constants of nitrification in the water layer and biochemical characteristics of nitri-fication in the bottom deposits in these areas were determined in special laboratory experiments. It was stated that the rate of nitrification in the water layer increases twice in the area after the discharge of treated wastewater com-pared to the area before discharge. Biochemical and microbiological indicators of nitrification in the active sludge of wastewater treatment facilities were established. It was shown that the discharge of wastewater (and hence ni-trifying bacteria) from wastewater treatment facilities that perform biological treatment with nitrification (without denitrification) increases the activity of nitrification processes in the water layer of a natural reservoir downstream.