Optimization of the degradation of organic complexants by Wet Air Oxidation

Bachir, Souley; Ambrosio, M.; Federici, V.; Barnier, H.

doi:10.1051/analusis:1998190

Cited by 2 publications

(3 citation statements)

References 5 publications

(6 reference statements)

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“…The E r values thus computed are 125 kJ mol -1 for TTA, 104 kJ mol -1 for DTPA, 99 kJ mol -1 for EDTA, and 78 kJ mol -1 for NTA. These E r values confirm the degradability order of the four compounds observed in a previous study . Thenoyltrifluoroacetone requires the greatest value of E r , which means that this compound is the least degradable substrate.…”

Section: Kinetic Studysupporting

confidence: 88%

Kinetics and Mechanism of Wet-Air Oxidation of Nuclear-Fuel-Chelating Compounds

Bachir

Barbati

Ambrosio

et al. 2001

Ind. Eng. Chem. Res.

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In this paper, we examine the wet-air oxidation (WAO) of four nuclear-fuel-chelating compounds [diethylenetriaminepentaacetic acid (DTPA), ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), and thenoyltrifluoroacetone (TTA)]. The study focuses on the kinetics and mechanism of the degradation process. Identification of the free-radical intermediates was performed via the spin-trapping technique. The reaction of each compound studied was found to occur in two steps, with a partial order of one with respect to TOC for both steps. Among the compounds studied, TTA shows the most difficulty when degrading. Hydroxyl, hydroxycarbonyl, and nitrogenous radicals are some of those formed during the degradation process. Schematic reaction pathways, which can explain the formation of some mineral byproducts, are proposed on the basis of these radicals.

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Section: Kinetic Studysupporting

confidence: 88%

Kinetics and Mechanism of Wet-Air Oxidation of Nuclear-Fuel-Chelating Compounds

Bachir

Barbati

Ambrosio

et al. 2001

Ind. Eng. Chem. Res.

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“…WAO experiments were carried out in a laboratory batch reactor which has been previously described [15]. The 500 mL autoclave is equipped with an agitator, a thermocouple, a liquid and a gas sample lines and a safety system.…”

Section: Wao Apparatusmentioning

confidence: 99%

“…As it was commonly assumed that temperature was the predominant factor for the improvement of the yield [15], the reaction mechanism was studied to try to understand why the yield was lower for a reaction temperature over 330°C. It was difficult to work directly on such a complex substrate, because the detailed composition of the sludge was not known.…”

Section: Experimental Conditionsmentioning

confidence: 99%

Optimization of the degradation of sewage sludge by wet air oxidation. Study of the reaction mechanism on a cellulose model compound

2000

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Abstract. The aim of this work is to optimize the degradation yield of an activated sludge and to study the reaction mechanism on a cellulose model compound. This optimization is performed with a Simplex design with four parameters: reaction temperature (280-350°C), injected air pressure (40-60 MPa), reaction time (10-45 minutes) and COD concentration (0.5-5 g L -1 ). The better yield obtained on TOC concentration is 82 5% at 330°C. Over this temperature, the yield substantially decreases. The use of cellulose as a model compound for activated sludge confirms optimization results and leads to the identification of by-products and free radical species participating in the reaction. Two major organic compounds have been detected: 4-oxo pentanoïc acid and 3-oxo butanoïc acid, and three types of radicals: HO°, CO 2°-and °CH(OH)CH 3 .

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Optimization of the degradation of organic complexants by Wet Air Oxidation

Cited by 2 publications

References 5 publications

Kinetics and Mechanism of Wet-Air Oxidation of Nuclear-Fuel-Chelating Compounds

Kinetics and Mechanism of Wet-Air Oxidation of Nuclear-Fuel-Chelating Compounds

Optimization of the degradation of sewage sludge by wet air oxidation. Study of the reaction mechanism on a cellulose model compound

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