A previous study carried out by the authors allowed to identify the optimum MgO by-product for a 100%
SO2 removal efficiency in a wet flue gas desulfurization (FGD) process. The present research analyzes the
synergistic effect between the main parameters affecting the proposed desulfurization process. The
design of experiments (DoE) was used as statistical tool for evaluating the influence of the solid-to-water
ratio (S/W), water (W) and time of reaction (tR) over the most important responses of the FGD process:
Mg2+, Ca2+ and SO4
2 in solution, pH and conductivity (k), and time of saturation (tS). According to the
analysis performed, the results of Mg2+ and Ca2+ leaching showed the greater effect of Mg compounds.
The production of SO4
2 was simultaneously affected by S/W and W, due to the mass-transfer nature of
the process. The pH range was found to be controlled by the solubility product of the alkaline phases
while k showed a linear dependency on the dissolution of the solid and SO2 absorption. As for desulfurization
efficiency, two behaviors were observed by the combined effect of the factors: low S/W ratios in
the whole W range showed that adding more solid had a positive effect as it increased tS while higher
ratios decreased it. Hence, an optimum S and W consumption for 100% removal efficiency can be
estimated in sake of saving energy, W and by-product. The present research methodology could be
extended to other by-products for wet FGD as the current EU legislation is driving the industry to the
reutilization of wastes and residues.
A previous study carried out by the authors allowed to identify the optimum MgO by-product for a 100%SO2 removal efficiency in a wet flue gas desulfurization (FGD) process. The present research analyzes thesynergistic effect between the main parameters affecting the proposed desulfurization process. Thedesign of experiments (DoE) was used as statistical tool for evaluating the influence of the solid-to-waterratio (S/W), water (W) and time of reaction (tR) over the most important responses of the FGD process:Mg2+, Ca2+ and SO42 in solution, pH and conductivity (k), and time of saturation (tS). According to theanalysis performed, the results of Mg2+ and Ca2+ leaching showed the greater effect of Mg compounds.The production of SO42 was simultaneously affected by S/W and W, due to the mass-transfer nature ofthe process. The pH range was found to be controlled by the solubility product of the alkaline phaseswhile k showed a linear dependency on the dissolution of the solid and SO2 absorption. As for desulfurizationefficiency, two behaviors were observed by the combined effect of the factors: low S/W ratios inthe whole W range showed that adding more solid had a positive effect as it increased tS while higherratios decreased it. Hence, an optimum S and W consumption for 100% removal efficiency can beestimated in sake of saving energy, W and by-product. The present research methodology could beextended to other by-products for wet FGD as the current EU legislation is driving the industry to thereutilization of wastes and residues.
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