Water Sustainability: a Process Systems Engineering Approach to Restoration of Eutrophica Lakes

ESTRADA, V.; DI MAGGIO, J.; DIAZ, M. S.

COMPUTERS AND CHEMICAL ENGINEERING

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2011 vol. 35 p. 1598 - 1613

0098-1354

This paper addresses restoration of eutrophic lakes and reservoirs through the formulation of dynamic optimization problems subject to highly complex partial differential algebraic equations (PDAE) systems representing processes that take place within the water bodies. Phytoplankton (three groups), zooplankton (two groups) and fish (three size classes) dynamics have been included in the model, as well as main nutrients, dissolved oxygen, particulate and dissolved carbon and silica. The PDAE has been transformed into an ordinary differential algebraic equation system by spatial discretization into two water layers. The optimal control problem for the determination of three different restoration techniques and their combination has been formulated within a vector parameterization dynamic optimization approach. Numerical results for the different problems provide optimal profiles for tributary derivation flowrate through a nearby wetland, as well as aeration rates and fish removal rates, respectively.