Abstract
A municipal wastewater treatment plant (WWTP) was simulated using ASM1 coupled to a dedicated aeration model. The influent component fractionation and key stoichiometric and kinetic parameters were obtained based on experiments. The coupled model was verified using a mass balance approach, and can predict the pollutant removal profile and DO concentration accurately. Furthermore, several control strategies were compared by simulating the aeration process in the WWTP. The control strategies were based on two main control structures: (1) feedback ammonia PI (proportional and integral) control structure, and (2) cascade feedforward and feedback ammonia PI control structure. A comprehensive approach was adopted to assess the optimal performance of each control strategy at different setpoints of effluent ammonia concentration and aeration volumes under control. Meanwhile, the interaction between the feedforward controller and the feedback controller was studied. The results show that the feedforward structure was more reliable and effective than the feedback structure in energy saving and effluent quality control. The feedforward controller had a significant effect on the performance of the feedback controller. However, the feedback structure alone could save up to 13.2% aeration energy without worsening the effluent quality under the proper control volume and ammonia load. Therefore, the feedback structure can be used as an upgrade alternative of the current aeration strategy.
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