Oxidation of industrial dyeing wastewater by supercritical water oxidation in transpiring-wall reactor
Gong, W; Li, F; Xi, D
| HERO ID | 1596818 |
|---|---|
| In Press | No |
| Year | 2008 |
| Title | Oxidation of industrial dyeing wastewater by supercritical water oxidation in transpiring-wall reactor |
| Authors | Gong, W; Li, F; Xi, D |
| Journal | Water Environment Research |
| Volume | 80 |
| Issue | 2 |
| Page Numbers | 186-192 |
| Abstract | Industrial dyeing wastewater was oxidized in supercritical water in a transpiring-wall reactor, using hydrogen peroxide as an oxidant. Experiments were performed at 595 to 704 K and 18 to 30 MPa, with an oxidant dosage ratio ranging from 0.6 to 2.0. A chemical oxygen demand (COD) removal of more than 98.4% was achieved at 704 K and 28 MPa, with a retention time less than 35 seconds, which increased with the temperature, pressure, and oxidant. A modified first-order rate expression was regressed from experimental data, taking into account the influence of induction time. The resulting pre-exponential factor, A, and activation energy, Ea, were 1.07 seconds(-1) and 12.12 kJ x mol(-1), respectively, while the reaction order for feed wastewater (based on COD) and oxidant were assumed to be 1 and 0, respectively. Gas chromatography/mass spectrometry analysis for effluents indicated that carbon dioxide, carbon monoxide, and nitrogen were the main reaction products, and phenol; benzenecarboxylic acid; 1, 2-benzenedicarboxylic acid; and isoquinoline were detected as intermediates. |
| Doi | 10.2175/106143007X221067 |
| Pmid | 18330230 |
| Wosid | WOS:000255663500013 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Source: Web of Science WOS:000255663500013 |
| Is Public | Yes |
| Language Text | English |
| Keyword | supercritical water oxidation; industrial dyeing wastewater; reactive dye; transpiring-wall reactor; kinetic |