Oxidation of industrial dyeing wastewater by supercritical water oxidation in transpiring-wall reactor.
Water Environ Res
; 80(2): 186-92, 2008 Feb.
Article
en En
| MEDLINE
| ID: mdl-18330230
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.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Agua
/
Oxidantes
/
Purificación del Agua
/
Peróxido de Hidrógeno
/
Residuos Industriales
Idioma:
En
Revista:
Water Environ Res
Asunto de la revista:
SAUDE AMBIENTAL
/
TOXICOLOGIA
Año:
2008
Tipo del documento:
Article
País de afiliación:
China
Pais de publicación:
Estados Unidos