Removal of Cyanide from Solutions by Air Oxidation and Adsorption

YAZICI E. Y., DEVECİ H., ALP İ., Yilmaz T., CELEP O.

International Conference on Environment: Survival and Sustainability, Nicosia, CYPRUS, 19 - 24 Şubat 2007, ss.907-916 identifier identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası:
  • Doi Numarası: 10.1007/978-3-540-95991-5_86
  • Basıldığı Şehir: Nicosia
  • Basıldığı Ülke: CYPRUS
  • Sayfa Sayıları: ss.907-916
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

In this study the removal of free cyanide from aqueous solutions by air oxidation and adsorption was investigated. Effects of air and pure oxygen, and catalyst on the rate and extent of the removal of cyanide were studied. It was found that the oxidative removal of cyanide by air/oxygen was very limited although it tended to improve in the presence of pure oxygen and catalyst such as activated carbon and copper sulphate. In the presence of continuous aeration, the non-oxidative removal of cyanide was correlated with a decrease in pH effected apparently by the transfer of carbon dioxide from air phase into the medium. The removal of cyanide by adsorption on activated carbon (AC), nut shell (NS) and rice husk (RH) was also examined. Adsorption capacity of activated carbon was shown to be significantly enhanced via impregnation of activated carbons with metals such as copper (AC-Cu) and silver (AC-Ag). In the column tests, the breakthrough capacity of adsorbents was found to be in an increasing order of RH