Treatment of textile wastewater by SCWO in a tube reactor

Soeguet O. O., Akguen M.

JOURNAL OF SUPERCRITICAL FLUIDS, cilt.43, sa.1, ss.106-111, 2007 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 43 Sayı: 1
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1016/j.supflu.2007.04.007
  • Dergi Adı: JOURNAL OF SUPERCRITICAL FLUIDS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.106-111
  • Anahtar Kelimeler: SCWO, oxidation kinetic, textile wastewater, disperse orange 25, COD, CATALYTIC WET OXIDATION, AZO-DYE, AQUEOUS-SOLUTIONS, AIR OXIDATION, DECOLORIZATION, DECOMPOSITION, DEGRADATION, OZONATION
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

Oxidation of aqueous solutions of a model azo dye pollutant (Cl Disperse Orange 25) was studied in a continuous flow reactor, operated at temperatures between 400 and 600 degrees C and at a fixed pressure of 25 MPa. The parameters used were the temperature, dye concentration, oxidant concentration and flow rate. The initial dye concentrations were in the range of 24.25 x 10(-3) and 121.25 x 10(-3) mol L(-1) in terms of chemical oxygen demand (COD). Hydrogen peroxide (H(2)O(2)) was used as a source of oxygen, and the initial oxidant concentrations were between 36.75 x 10(-3) and 183.75 x 10(-3) mol L(-1). The results demonstrated that the supercritical water oxidation (SCWO) process decreases the chemical oxygen demand up to 98.52% in very short reaction times (at a residence time of 4-12 s). Global rate expression according to wastewater and oxidant concentration was regressed from the complete set of data. The first-order global rate expression was determined with an activation energy of 27.8(+/- 1.2) kJ mol(-1) and a pre-exponential factor of 34.3(+/- 1.5) s(-1) to a 95% confidence level. (C) 2007 Elsevier B.V. All rights reserved.