Improvement of Palladium Ions Recovery via Hollow Fiber Supported Liquid Membrane with Model Predictive Control

A Hollow fiber supported liquid membrane (HFSLM) unit has been widely studied to separate metal ions at very low concentration with high selectivity because it combines the process of extraction and stripping into a single stage. Therefore the HFSLM unit has been suitably applied for the recovery of low concentrated palladium iron from wastewater released by flexible printed circuit board industry. This research presents the modelling of the palladium ions recovery via HFSLM and applicability of a model predictive controller (MPC) to achieve high concentration of palladium ions. It was found that the final predicted and actual concentrations of palladium ions are in good agreement; sum squares of errors in palladium ions is of 6.67. Percentages of palladium ions recovery are about 96.85. In addition, simulation results show that the MPC controller provides good control response and gives better control performance than a PID controller does in both normal and parameter mismatch cases.