Control of Nitrogen Sources and Principles of Treatment

Abstract

Nitrogen-removal efficiencies were calculated in relation to sludge ages. The effluent of a physical-treatment plant was passed through a plant-scale biological unit where nitrification and denitrification occurred. A biological-treatment unit consisting of five cascades was used as a pilot-scale plant, and the respirometric activity and nitrogen concentration in different forms were measured. The variation of ammonium concentrations within the reactor under various recycle ratios and sludge load conditions is presented.