Electrocoagulation treatment of reject brine effluent from Solvay process
Abstract
Solvay process is an efficient treatment technique for reject brine from desalination, where salinity
is reduced by removing Na+
by adding NH3
. However, in this process large amounts of NH3
are
consumed and Cl–
ions are not affected. Electrocoagulation has been tested for removing Cl–
and
NH3 regeneration. When no current was applied, removal of the ions was insignificant. Applying
a current density of 0.1167 A/cm2
increased the removal percentages of NH4+ and Cl–
by 71.6% and
26.9%, respectively, which proved that the removal was due to electrocoagulation. It was found that
the removal percentages and rates increased with increasing the current density and temperature but
decreased as the initial ion concentration increased. Three-experiment design levels and response
surface methodologies were used to model the system. A second-order polynomial model was developed and used to predict the optimum conditions, which were found to be at a 0.2 A/cm2
current
density, 36.8°C temperature, and initial Cl−
concentration of 7.4 × 103mg/L. The accuracy of the model
was verified against an independent run, not used in the development of the model, and the error
did not exceed 10% for both ions
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