Steady-state simulations for predicting some calcium salts supersaturations in Polluted Coastal Region Seawater

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Research Paper 01/12/2019
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Steady-state simulations for predicting some calcium salts supersaturations in Polluted Coastal Region Seawater

Fatma Ben Rejeb, Seif Eddine Yacoubi, Ahmed Hannachi
J. Bio. Env. Sci.15( 6), 122-132, December 2019.
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Marine ecosystems are enduring the disastrous effects caused by all kind of human waste discharge in seawater. Despite, the tighter environmental regulations, industrial waste effluents are still the major contributors to marine pollution. Assessing pollutants dispersion and its impact on marine ecosystems is an active research area. Approaches based on simulations using powerful calculation tools, are leading the way for unfolding detailed insights on pollutants dispersion and their environmental impact. In this work, simulations using ANSYS Fluent software were conducted to evaluate the impact of Brackish Water Reverse Osmosis (BWRO) desalination brine and a Fluoride rich effluent disposal in a confined coastal zone of the Gulf of Gabes-Tunisia. The goal was to assess the impact of waste-streams on calco-carbonic equilibrium reactions in seawater. A two-dimensional (2D) steady-state dispersion model was used allowing estimating minerals and pollutants contents in seawater within the affected coastal zone. Superasaturation contours with respect to calcium carbonate, calcium sulfate and calcium fluoride were predicted. In the investigated worst-case scenario, simulations showed that most of the studied marine zone was affected by effluents disposal. pH and supersaturations with respect to calcium carbonate were much below the normal seawater values. This could encompass a serious threat to shell marine species in the region.


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