The use of a Flue Gas Desulphurisation (FGD)-gypsum as material for selenium removal in re-circulated waters from a wet limestone FGD system with water re-circulation to the scrubber and with use of an Al-additive, to increase SO2 emission abatement efficiencies, has been evaluated by adsorption studies. Potentiometric titration experiments for FGD-gypsum reveal that the acidic conditions of the aqueous phase of gypsum slurry, induced by the Al-additive, result in the protonation of the FGD-gypsum surface. The adsorption isotherms of Se onto FGD-gypsum are appropriately described by the Langmuir model suggesting that Se is adsorbed by the protons adhered on FGD-gypsum surface and forms a monolayer. The removal of Se from FGD waters by the employment of FGD-gypsum is significant as prevention measure based on the management on FGD-gypsum and water streams before their production and the subsequent disposal in landfills and/or in application scenarios.
|Journal||Journal of Environmental and Analytical Toxicology|
|Publication status||Published - 18 Jun 2015|
- Re-circulated waters
- FGD systems
- Potentiometric titration
- Adsorption isotherms
Cordoba-Sola, P., González, M. E., González, A., Maroto-Valer, M. M., Moreno, N., Sepúlveda, N., Navia, R., & Querol, X. (2015). Evaluation of a Flue Gas Desulphurisation (FGD)-Gypsum from a Wet Limestone FGD as Adsorbent for Removal of Selenium in Water Streams. Journal of Environmental and Analytical Toxicology, 5(5), . https://doi.org/10.4172/2161-0525.1000305