Modelling and control of fouling in submerged membrane bioreactor using neural network internal model control

Nurazizah Mahmod, Norhaliza Abdul Wahab, Muhammad Sani Gaya

Abstract


Membrane bioreactor (MBR) is one of the best solutions for water and wastewater treatment systems in producing high quality effluent that meets its standard regulations. However, fouling is one of the main issues in membrane filtration for membrane bioreactor system. The prediction of fouling is crucial in the membrane bioreactor control system design. This paper presents an intelligence modeling system so called artificial neural network (ANN). The feedforward neural network (FFNN), radial basis function neural network (RBFNN) and nonlinear autoregressive exogenous neural network (NARXNN) are applied to model the submerged MBR filtration system. The simulation results show good predictions for all methods which the highest performance of the model given by RBFNN. Based on the developed models, the neural network internal model control (NNIMC) is implemented to control fouling development in membrane filtration process. Three different control structures of the NNIMC are proposed. The FFNN IMC, RBFNN IMC and NARXNN IMC controllers are compared to the conventional IMC. The RBFNN IMC has a superior performance both in tracking and disturbance rejections.

Keywords


Membrane Bioreactor; Fouling; Artificial Neural Network; Feedforward Neural Network; Radial Basis Function Neural Network; Nonlinear Autoregressive Exogenous Neural Network; Internal Model Control

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DOI: http://doi.org/10.11591/ijai.v9.i1.pp100-108
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