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Lumped kinetic model for catalytic wet oxidation of organic compounds in industrial wastewater
Author(s) -
Zhang Qinglin,
Chuang Karl T.
Publication year - 1999
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690450112
Subject(s) - wet oxidation , catalysis , kraft process , chemistry , pulp mill , wastewater , industrial wastewater treatment , slurry , effluent , aqueous solution , leaching (pedology) , sodium hydroxide , catalytic oxidation , paper mill , inorganic chemistry , chemical engineering , kraft paper , waste management , organic chemistry , environmental engineering , environmental science , engineering , soil science , soil water
A simplified reaction pathway was proposed to describe the kinetic behavior of catalytic wet oxidation of organic mixture. The oxidation reactions were divided and lumped into two groups: (1) the deep or complete oxidation reactions with formation of CO 2 and H 2 O; (2) the partial oxidation reactions with formation of all intermediates in aqueous solution of the industrial wastewater. The concentrations of all reactants in wastewater and those of the intermediates formed during the reaction are also represented by a lumped concentration of total organic carbon (TOC). To test the model, catalytic oxidation of organic pollutants in an effluent from a softwood Kraft pulp mill was investigated in a slurry reactor using a Pd‐Pt/Al 2 O 3 catalyst. Sodium hydroxide was used to adjust the initial pH of wastewater to 7.3 to avoid the problem of metal leaching and excessive corrosion. The lumped kinetic model developed in this study describes well both our experimental data and those reported in literature. The lumped kinetic model proposed in this study can be used for both catalytic and noncatalytic wet oxidation processes.