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Studies in mineralization of aqueous aniline using Fenton and wet oxidation (FENTWO) as a hybrid process
Author(s) -
Gunale Tukaram L,
Mahajani Vijaykumar V
Publication year - 2007
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.1646
Subject(s) - mineralization (soil science) , chemistry , aniline , catalysis , wet oxidation , aqueous solution , oxalic acid , chemical oxygen demand , oxygen , partial oxidation , inorganic chemistry , nuclear chemistry , wastewater , organic chemistry , waste management , nitrogen , engineering
A hybrid process for mineralization of aqueous aniline using Fenton and wet oxidation (FENTWO) is studied. It is important to have maximum conversion of ‘N’ atoms from the waste to N 2 . The conversion of input ‘N’ atoms in aniline to N 2 was 15% during wet oxidation without the Fenton process and was improved to 50% with the Fenton process. Therefore, a hybrid process of Fenton followed by wet oxidation was studied for mineralization of the aqueous aniline stream. The parameters for the Fenton process were optimized (pH, catalyst, H 2 O 2 to catalyst (FeSO 4 ) ratio, quantity of H 2 O 2 ). The waste obtained after the Fenton process was then treated by wet oxidation for mineralization by having homogeneous CuSO 4 as the catalyst by keeping FeSO 4 therein. This combined catalyst was found to be more effective for the degradation of the intermediates formed in the Fenton process. Wet oxidation (WO) was studied in the temperature range 473–513 K and the oxygen partial pressure range 0.345–1.38 MPa at pH 6.5. The kinetic data was modeled using a power law rate expression in terms of chemical oxygen demand (COD). The optimum temperature for formation of more N 2 gas was found to be 493 K. The treated waste stream was found to contain oxalic acid using HPLC, and NH 4 + , NO 3 − and NO 2 − ions using ion chromatography analysis. Copyright © 2007 Society of Chemical Industry