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  • Title: [Experiment study on real-time controlling rules of A/O nitrogen removal process].
    Author: Du H, Ma Y, Peng YZ, Wang BZ.
    Journal: Huan Jing Ke Xue; 2005 Jul; 26(4):100-5. PubMed ID: 16212176.
    Abstract:
    The aim of this work is operational optimization of an A/O process in the lab plant with synthetic wastewater for improving nitrogen removal efficiency. Ammonia control aims at maintaining the required concentration of ammonia in the effluent by manipulating the dissolved oxygen (DO) set point and aeration volumes. Nitrate control aims at the optimal use of the denitrification potential at any moment by continuously adjusting the internal recirculation flow or (and) external carbon addition flow in order to maintain a desired nitrate set point in the anoxic zone. The control strategies have been based on a hierarchical structure where a high level or supervisory control selects the set point of the low level or conventional controllers. Results indicated that it was possible to increase nitrogen removal efficiency, improve the effluent water quality, save energy, and reduce operating costs.
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