Degradation of Monoethanolamine in Aqueous Solution by Fenton’s Reagent with Biological Post-treatment

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 (H 2 O 2 -Fe 2+ ) 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 H 2 O 2 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.

Considerable Fenton and photo-Fenton reactivity of passivated zero-valent iron

“…64 Moreover, the biodegradability of xenobiotics oen increases signicantly during the rst oxidative (Fenton) steps, although mineralization may not be achieved, and a combined process with a biological post-treatment is an interesting option. 65 However, the harmful effects of the transformation intermediates may be very important for some pollutants, and the suitability of pZVI-Fenton as treatment system should be checked case by case, depending on the substrate to be degraded.…”

Utilizing transient breakthroughs for evaluating the potential of Kureha carbon for CO2 capture

“…Amine scrubbing is an extensively investigated method of capturing CO 2 from coal-fired power plant exhaust gas (flue gas); however, the process is energy-intensive [4] and requires waste treatment for amine degradation products and side products [5]. These factors necessitate a continuous search for more efficient and environmentally friendly ways to capture CO 2 from various gas streams.…”

Photochemical oxidation of methyldiethanolamine (MDEA) in aqueous solution by UV/K2S2O8 process

“…The Fenton' reagent in the AOPs was used to degrade MEA [10], DEA [11], N,N-diethyl-p-phenylenediamine [12] and DIPA [13]. Also, the use of UV/H 2 O 2 in the AOPs for degradation of MEA and MDEA [4,14] and ozonation for degradation of DEA [15] have been studied.…”