Degradation of dimethyl sulfoxide through fluidized-bed Fenton process: kinetic analysis

• Published in: International journal of environmental science and technology (Tehran) Vol. 13; no. 4; pp. 1017 - 1028
• Main Authors: Chen, T.-C., Matira, E. M., Lu, M.-C., Dalida, M. L. P.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.04.2016
• Subjects: Aquatic Pollution; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Science and Engineering; Original Paper; Soil Science & Conservation; Waste Water Technology; Water Management; Water Pollution Control; Kinetic model; Dimethyl sulfoxide; Fluidized-bed Fenton process
• ISSN: 1735-1472; 1735-2630
• DOI: 10.1007/s13762-015-0924-9

In this study, fluidized-bed Fenton process (FBF) was used to degrade dimethyl sulfoxide (DMSO), one of the most widely used solvents. Oxidation by Fenton’s reagent, Fe +2 and H 2 O 2 , is one of the cheapest advanced oxidation processes due to the high availability of the reagents. FBF is a modified approach that reduces the large amount of iron oxide sludge formed in conventional Fenton process. The optimal treatment efficiencies by FBF with 2 h of reaction were 95.22 % of DMSO degradation and 34.38 % of COD removal at the conditions of 5 mM DMSO, 68.97 g/L SiO 2 carrier, pH initial 3.0, 5 mM Fe 2+ , and 32.5 mM H 2 O 2 . The kinetic study was also done to investigate the two stages involved in the oxidation. The first stage fitted the zero reaction order with overall initial rate’s apparent rate constant, k 1 , of −0.099. The second stage fitted the first order of DMSO degradation, with rate constant, k 2 , of −0.0005.