Oxidation of Industrial Dyeing Wastewater by Supercritical Water Oxidation in Transpiring-Wall Reactor

Authors: Gong, Wei-Jin; Li, Fang; Xi, Dan-Li

Source: Water Environment Research, Volume 80, Number 2, February 2008 , pp. 186-192(7)

Publisher: Water Environment Federation

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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 · 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.

Keywords: supercritical water oxidation; industrial dyeing wastewater; reactive dye; transpiring-wall reactor; kinetic

Document Type: Research article

DOI: http://dx.doi.org/10.2175/106143007X221067

Publication date: 2008-02-01

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Water Environment Research� (WER�) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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Oxidation of Industrial Dyeing Wastewater by Supercritical Water Oxidation in Transpiring-Wall Reactor

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