Impact of desalination plants brine injection wells on coastal aquifers |
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Authors: | Mohamed K K Nassar Reda M El-Damak Ashraf H M Ghanem |
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Institution: | (1) Environmental Studies and Research Institute (ESRI), Menofiya University, 32897 Sadat City, Egypt;(2) Irrigation and Hydraulics Department, Faculty of Engineering, Cairo University, Giza, Egypt |
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Abstract: | A new methodology is developed in assessing environmental impacts of desalination plants discharging brine into the ground.
The main environmental problem of the desalination of seawater is the brine disposal. The brine is commonly discharged into
the sea or injected into a saline aquifer. In the case of injection into the ground, it is necessary to design a disposal
system in a way that respects the environment and is sustainable. Laboratory and computational methods have been utilized
to simulate the unsteady three-dimensional (3D) phenomena of subsurface brine disposal. The computational software used is
SEAWAT, which is a 3D unsteady variable-density flow simulation model. The model is first used to simulate the laboratory
results, and good agreement is achieved. Then, hypothetical problems are designed and simulated of groundwater extraction
and brine disposal by desalination stations. The major purpose of these hypothetical problems is to delineate a methodology
and to create design charts for design and management of production and injection well fields for coastal desalination plants.
Several design charts have been developed with 36 scenarios for two well configurations created by four design parameters:
relative salt concentration (RSC), production and injection rates (Q
d
, Q
r
), well spacing (S), and simulation period (T). |
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Keywords: | Brine disposal Injection well Desalination SEAWAT Groundwater |
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