Reduction of operational cost and certification of safety for treated water are required for the membrane filtration process for drinking water. Therefore a model-based control system is developed to reduce operational cost. A process model is used for the model-based control system that calculates the transmembrane pressure (TMP) in the future. This allows the model-based control system to optimize the coagulant dosage for the pretreatment process and the backwash interval for the membrane filtration process automatically. The cost reduction effect is verified using a pilot-scale plant.
Keywords: coagulation, control, membrane filtration process, process model