Oxidation of Industrial Dyeing Wastewater by Supercritical Water Oxidation in Transpiring-Wall Reactor
| Autor: | Wei-Jin Gong, Fang Li, Dan-Li Xi |
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| Rok vydání: | 2008 |
| Předmět: |
Order of reaction
Industrial Waste Water Purification chemistry.chemical_compound Pressure Water Pollution Chemical Environmental Chemistry Organic chemistry Hydrogen peroxide Waste Management and Disposal Water Science and Technology Supercritical water oxidation Ecological Modeling Chemical oxygen demand Temperature Water Hydrogen Peroxide Oxidants Pollution Supercritical fluid Oxygen Kinetics chemistry Wastewater Carbon dioxide Oxidation-Reduction Water Pollutants Chemical Carbon monoxide Nuclear chemistry |
| Zdroj: | Water Environment Research. 80:186-192 |
| ISSN: | 1061-4303 |
| DOI: | 10.2175/106143007x221067 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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