Evaluation of a Flue Gas Desulphurisation (FGD)-Gypsum from a Wet Limestone FGD as Adsorbent for Removal of Selenium in Water Streams

Patricia Cordoba-Sola, Maria Eugenia González, Aixa González, M Mercedes Maroto-Valer, Natalia Moreno, Noelia Sepúlveda, Rodrigo Navia, Xavier Querol

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Abstract

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.
Original languageEnglish
Article number1000305
JournalJournal of Environmental and Analytical Toxicology
Volume5
Issue number5
DOIs
Publication statusPublished - 18 Jun 2015

Keywords

  • FGD-gypsum
  • Re-circulated waters
  • FGD systems
  • Potentiometric titration
  • Adsorption isotherms

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