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Catalytic Wet Oxidation of 2,4‐Dichlorophenol Solutions: Activity of the Manganese–Cerium Composite Catalyst and Biodegradability of the Effluent Stream
Author(s) -
Lee BingNan,
Lou JieChung,
Yen PoChung
Publication year - 2002
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143002x139721
Subject(s) - cerium , catalysis , manganese , chemistry , wet oxidation , inorganic chemistry , effluent , cerium nitrate , aqueous solution , catalytic oxidation , nuclear chemistry , organic chemistry , environmental engineering , engineering
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.