Özet
Oxidation of aqueous solutions of a model azo dye pollutant (CI Disperse Orange 25) was studied in a continuous flow reactor, operated at temperatures between 400 and 600 °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 × 10-3 and 121.25 × 10-3 mol L-1 in terms of chemical oxygen demand (COD). Hydrogen peroxide (H2O2) was used as a source of oxygen, and the initial oxidant concentrations were between 36.75 × 10-3 and 183.75 × 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.
Orijinal dil | İngilizce |
---|---|
Sayfa (başlangıç-bitiş) | 106-111 |
Sayfa sayısı | 6 |
Dergi | Journal of Supercritical Fluids |
Hacim | 43 |
Basın numarası | 1 |
DOI'lar | |
Yayın durumu | Yayınlandı - Kas 2007 |
Harici olarak yayınlandı | Evet |