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Stochastic evolutionary-based optimization for rapid diagnosis and energy-saving in pilot- and full-scale Carrousel oxidation ditches

L. Li1, L. Lei1, M. S. Zheng1, A. G. L. Borthwick2, and J. R. Ni1,*

  1. Department of Environmental Engineering, Peking University; Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
  2. Institute of Energy Systems, School of Engineering, The University of Edinburgh, The King’s Buildings, Edinburgh EH9 3JL, UK

*Corresponding author. Tel.: +(86)10-62751185; fax: +(86)10-62756526. E-mail address: (J. R. Ni).


Energy consumption is a primary issue needed to be considered for wastewater treatment targeting qualified effluent. In this paper, a hybrid model is proposed for rapid diagnosis of operational conditions meeting requirements of discharge standards and energy saving in Carrousel Oxidation Ditches (ODs). Based on a three-dimensional (3D) three-phase computational fluid dynamics (CFD) model, we developed an artificial neural network (ANN) model with back propagation algorithm and an accelerating genetic algorithm (AGA) model to achieve real-time simulation and system optimization in the Carrousel ODs. By incorporating the 3D-CFD and multi-site ANN models, the hybrid model provided reasonable predictions of liquid flow, sludge sedimentation and water quality in the Carrousel ODs. With help of the AGA model based on evolution theory, system optimization could be reached to meet multiple purposes such as energy saving, water-quality improving and normal sludge distribution, which was successfully demonstrated in both pilot- and full-scale Carrousel ODs.

Keywords: three-dimensional three-phase, artificial neural network, rapid feedback, optimization, energy saving, oxidation ditch

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