Dynamic optimisation of small size wastewater treatment plants including nitrification and denitrification processes

In this payer, dynamic optimisation of small size wastewater treatment plan ts is studied. The problem is stated as a hybrid dynamic optimisation probl em which is solved using a gradient-based method. The aeration policy which minimises the energy consumption and satisfies discharge requirements unde r specified constraints (process and physical constraints) is then determin ed. The comparison between usual rule-based control policies and optimised aeration strategies showed that, the optimised aeration profiles lead to re ductions of energy consumption of at least 30%. (C) 2001 Elsevier Science L td. All rights reserved.