Removal of selenocyanate from water using elemental iron

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Abstract

Batch experiments were conducted to investigate the removal of selenocyanate (SeCN-) from oil refinery wastewater and artificial wastewater with elemental iron [Fe(0)]. The chemical forms of selenium in the reacted solids were determined with X-ray photoelectron spectroscopy (XPS) and a sulfite extraction procedure. SeCN- was effectively removed from the wastewater with Fe(0) filings when the water pH was controlled at approximately 6. SeCN- was removed by Fe(0) through the formation of elemental selenium [Se(0)] and ferrous selenide. The possible chemical reactions between SeCN- and Fe(0) included deselenation of SeCN- and electrochemical reduction of Se(0) to selenide. A cost-effective process may be developed for the treatment of SeCN- in wastewater using Fe(0).

Original languageEnglish
Pages (from-to)3867-3873
Number of pages7
JournalWater Research
Volume36
Issue number15
DOIs
StatePublished - Sep 2002

Keywords

  • Deselenation
  • Iron
  • Refinery
  • Selenium
  • Selenocyanate
  • Wastewater

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