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Wastewater treatment is just one component in the urban water cycle; however, it is an important component since it ensures that the environmental impact of human usage of water is significantly reduced. It consists of several processes: biological, chemical and physical processes. Wastewater treatment aims to reduce: nitrogen, phosphorous, organic matter and suspended solids. To reduce the amount of these substances, wastewater treatment plants (WWTP) consisting of (in general) four treatment steps, have been designed. The steps are: a primarily mechanical pre-treatment step, a biological treatment step, a chemical treatment step and a sludge treatment step. See Figure 1. The quality of water is proportional to the quality of life and therefore in modern world the sustainable development concept is to save water. The goal of a wastewater treatment plant is to eliminate pollutant agents from the wastewater by means of physical and (bio) chemical processes. Modern wastewater treatment plants use biological nitrogen removal, which relies on nitrifying and denitrifying bacteria in order to remove the nitrogen from the wastewater. Biological wastewater treatment plants are considered complex nonlinear systems due to large variations in their flow rates and feed concentrations. In addition, the microorganisms that are involved in the process and their adaptive behaviour coupled with nonlinear dynamics of the system make the WWTP to be really challenging from the modelling and control point of view [Clarke D.W ], [Dutka.A& Ordys], [Grimblea & M. J], [H.Elbahja & P.Vega],[ H.Elbahja & O.Bakka] and [O.Bakka & H.Elbahja].

Investigation of Different Control Strategies for the Waste Water Treatement Plant