Nonlinear Model Predictive Control (NMPC) Konvensional dan Economic NMPC (E-NMPC) untuk Optimisasi Teknis dan Ekonomis Sistem Reaktor Biokimia = Application of Conventional Nonlinear Model Predictive Control (NMPC) and Economic NMPC (E-NMPC) for Technical and Economical Optimization of a Biochemical Reactor System