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Title: Catalytic wet air oxidation of carboxylic acid present in wastewater
Authors: Kumar, Pradeep
Raghavendra, P V K
Chand, Shri
Keywords: Acrylic acid;CWAO;COD reduction;Catalysts;Reaction kinetics
Issue Date: Oct-2006
Publisher: CSIR
Abstract: Catalytic Wet Air Oxidation (CWAO) of acrylic acid, a representative of carboxylic acids, was carried out in a pressurized reactor at a partial pressure of air (4 kg/cm2) and temperature (140-180°C) to reduce the COD of wastewater containing acrylic acid. Catalysts tested include both homogeneous (CuSO4 and FeSO4) and heterogeneous [Co: Bi (5:1) and Mn: Ce (1:1)] catalysts. Catalytic activity of Mn: Ce (1:1) at 5g/l was best with 86% COD reduction at 180°C and air partial pressure 4 kg/cm2 in 6 h. Initial pH of the solution has strong effect on COD reduction. Reaction kinetics of wet air oxidation of acrylic acid fitted well a first order kinetics with respect to COD of acrylic acid. Catalysts activity was correlated in terms of the physical characteristics.
Page(s): 838-842
ISSN: 0975-1084 (Online); 0022-4456 (Print)
Appears in Collections:JSIR Vol.65(10) [October 2006]

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