Catalytic Wet Oxidation of 2,4-Dichlorophenol Solutions: Activity of the Manganese–Cerium Composite Catalyst and Biodegradability of the Effluent Stream
Abstract:Aqueous solutions containing 100 to 1000 mg/L of 2,4-dichlorophenol (2,4-DCP) were oxidized in an upflowing fixed-bed reactor in this study of manganese–cerium composite catalysts, which were prepared by the coprecipitation of both manganese nitrate and ceric nitrate at various molar concentrations. Results showed that 2,4-DCP conversion by wet oxidation in the presence of the manganese–cerium composite catalysts was a function of the molar ratio of the manganese–cerium catalyst. The kinetic behavior of 2,4-DCP oxidation with catalysis could be explained by using a zero-order rate expression. Total organic carbon (TOC) removal by wet oxidation in the absence of any catalyst was nil, while approximately 68% TOC reduction was achieved during wet oxidation over a manganese–cerium (7:3 mol/mol) catalyst at 160 °C and an oxygen partial pressure of 1.0 MPa. Moreover, the 5-day biochemical oxygen demand/chemical oxygen demand ratios of all the effluent streams were determined to be greater than 0.45 as the wet catalytic processes were carried out at a liquid hourly space velocity less than 24 h−1, indicating that they could be made more amenable to further biological treatment.
Document Type: Research Article
Publication date: January 1, 2002
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