An optimal trace zinc biomonitor (Haliotis diversicolor supertexta) control system design in aquacultural ecosystems

摘要

The purpose of this paper is to synthesize an optimal trace metal biomonitor control system to efficiently manage aquacultural water quality. A biomoniotr organism of gastropod mollusc Haliotis diversiolor supertexta was chosen to estimate zinc (Zn) bioaccumulation. The bioaccumulation dynamics of Zn by H. diversicoor supertexta from an alga Gracilaria tenuistipitata var. liui and ambient water in aquaculture ponds is developed based on a six-compartment pharmacokinetic model. A linear control model based on the dynamic bioaccumulation model is developed to design an optimal feedback biomonitor control system. Linear quadratic regulators (LORs) with output feedback control of a linear-invariant system reassigned for design algorithm and an optimal proportional plus integral (PI) feedback control strategy is synthesized. Numerical results from the model implementation show that the optimal selection of tuning parameters and the resulting costs vary with desired equilibrium state. The designed optimal feedback biomoniotr control system, when suitably tuned, gives a satisfactory monitor of mollusk Zn bioaccumulation. The biomonitor system developed accounting for bioaccumulation dynamics of Zn in the target tissues of mollusks can be used in the future to evaluate the effects of suspended solid removal devices and biofilters and/or other control scenarios on water equality management in aquacultural ecosystems.