Abstract
Alkanolamines in the wastewater from gas treating plants are not readily biodegradable. In this work, we have investigated the effectiveness of the Fenton’s reagent (H2O2-Fe2+) to treat monoethanolamine (MEA) as a model compound in simulated wastewater. Degradation studies were carried out in a jacketed glass reactor. The effects of concentrations of ferrous sulfate, hydrogen peroxide, and the pH of a solution on the rate of reaction were determined. A pH of 3 was found to be the optimum. The degradation reaction proceeds very fast at the beginning but slows down significantly at a longer time. A larger fractional degradation of the organics in solution was observed if the initial chemical oxygen demand (COD) of the feed solution was high. Gradual addition of H2O2 to the reaction mixture increased the COD removal by about 60% compared to one-time addition of the reagent at the beginning of the process. A rate equation for mineralization of the amine was developed on the basis of a simplified mechanistic model, and the lumped value of the rate constant for COD removal was determined. A partially degraded MEA solution as well as “pure” MEA was subjected to biological oxidation by activated sludge. The former substrate degraded much faster. The degradation rate and biomass generation data could be fitted by the Monod kinetic equations.
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Acknowledgements
The authors would like to thank Sominidevi and Nurul Huda, final year students, for experimental help; Universiti Teknologi Petronas (UTP) for financial assistance through a STIRF project; Dr. Chong Fai Kiat, Senior Lecturer, UTP, for help in taking FTIR spectra; and Mr. Zaaba Mohammad, UTP, for laboratory help.
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Harimurti, S., Dutta, B.K., Ariff, I.F.B.M. et al. Degradation of Monoethanolamine in Aqueous Solution by Fenton’s Reagent with Biological Post-treatment. Water Air Soil Pollut 211, 273–286 (2010). https://doi.org/10.1007/s11270-009-0298-z
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DOI: https://doi.org/10.1007/s11270-009-0298-z