Integrated modelling of eutrophication and fate of organic contaminants in rivers

摘要

In this study, a one-dimensional dynamic integrated model of eutrophication and fate of organic contaminants in rivers was developed using a multi-compartment model (air, water and benthic sediment) and a conceptual dynamic hydraulic model (continuously stirred tank-in-series). The model assumes local sorption equilibrium within the compartments, but no equilibrium between the compartments (water, sediment, air, and biota). The usefulness of the proposed model was evaluated based on the Crocodile River (South Africa) and the river Lambro (Italy) case studies for nutrient dynamics (inorganic nitrogen) and fate of organic contaminant (Linear Alkylbenzene Sulfonates, LAS) respectively. The model calibration, validation and the scenario analysis results are presented. The results show that the interaction of fate and effect of nutrients (eutrophication) and toxic organic contaminants should be considered in the exposure assessment of river ecosystem. Furthermore, the integrated model gives more valuable information for various scenario analyses than single-issue models.