The necessity to achieve nitrogen and phosphorus removal in wastewater, according to the European Directive (EEC 1991), leads to the conception of new methods to control the aeration of low-loaded activated sludge plants. The behaviour of N.NOx concentrations and of ORP during a complete nitrification-denitrification cycle is described by a typical profile with 3 bending-points: α, β and χ. The goal of this study is to get more insights into the biological and chemical signification of the bending-points. This leads to the conception of new real-time control systems able to be adaptive to the influent load variations and free from ORP drift problems. The results obtained on pilot-scale plant using a three bending-points based control strategy show a real advantage through a decrease of the global aeration duration.
Real-time control of nitrogen removal using three ORP bending-points: signification, control strategy and results
S. Plisson-Saune, B. Capdeville, M. Mauret, A. Deguin, P. Baptiste; Real-time control of nitrogen removal using three ORP bending-points: signification, control strategy and results. Water Sci Technol 1 January 1996; 33 (1): 275–280. doi: https://doi.org/10.2166/wst.1996.0027
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