Hydrothermal oxidation: Application to the treatment of different cutting fluid wastes

Sánchez-Oneto, Jezabel; Portela, Juan R.; Nebot, Enrique; Ossa, E.J. Martı́nez de la

doi:10.1016/j.jhazmat.2007.01.088

Cited by 58 publications

(25 citation statements)

References 8 publications

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“…These compounds are difficult to oxidize and produce intermediate compounds like short chain fatty acids, such as acetic acid (a typical intermediate compound in SCWO 38 ), propionic acid and butyric acid, that need higher residence times and temperatures to be eliminated. 19,27,39 For this reason, treatment of the wastewater under investigation here gave better results at high temperature. As the reactor was built of AISI 316L stainless steel, the maximum achievable temperature was 550…”

Section: Cod and Toc Removalmentioning

confidence: 91%

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Supercritical water oxidation of flammable industrial wastewaters: economic perspectives of an industrial plant

Vadillo

García-Jarana

Sánchez-Oneto

et al. 2011

J of Chemical Tech & Biotech

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BACKGROUND: Supercritical water oxidation (SCWO) is a promising technology that respects the environment, destroys wastes and allows energy recovery. This process has been applied to many model compounds and real wastewaters at laboratory scale. However, SCWO treatments at pilot plant scale of real wastewaters are scarce. The application of this technology to industrial wastewaters has drawbacks such as corrosion, salt deposition and high cost, so industrial scale-up has been delayed.

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Section: Cod and Toc Removalmentioning

confidence: 91%

“…SCWO experiments at laboratory scale were carried out in a continuous flow system used previously in earlier work. 19,26,27 This system, based on a continuous tubular reactor of 0.080 L, is able to treat wastewaters with concentrations (in terms of COD concentration) up to 5 g O 2 L −1 , in the range 350-500…”

Section: Equipmentmentioning

confidence: 99%

Supercritical water oxidation of flammable industrial wastewaters: economic perspectives of an industrial plant

Vadillo

García-Jarana

Sánchez-Oneto

et al. 2011

J of Chemical Tech & Biotech

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“…Supercritical water oxidation (SCWO) is an advanced technology for treatment of organic wastes with green and high effective removal [4][5]. Super critical water (SCW, Tc=647K, Pc=22.1MPa) has several distinctive properties which are very differently from the water under normal conditions.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of Dyeing Sludge in Supercritical Water

Wang

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In this study, the effect of SCWO treatment, transformation characteristics of heavy metals and corrosion of Ni-based alloy 625 during dyeing sludge supercritical water oxidation (SCWO) were investigated. The experiment carried out at 580℃, 25MPa, oxidation coefficient of 1.3, reaction residence time 10min. The removal rate of COD reached 99.3% at the optimum reaction conditions which means the COD is almost completely destructed. Results of heavy metals determination showed that the concentration of Cu in the liquid products was 0.266mg/L, while Zn and Pb could not be detected under the experimental conditions. This implied that Cu, Zn and Pb in residues after SCWO treatment were more stable than that in raw sludge. The corrosion behaviour of Ni-based alloy 625 was discussed in different conditions. Consequently, it is believed that SCWO treatment is an effective alternative for safety disposal of dyeing sludge.

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“…All of these criteria could be satisfied by a process known as supercritical water oxidation or SCWO. This is an advanced oxidation process that takes advantage of the fascinating properties of supercritical water as a reaction medium at conditions of temperature and pressure higher than the critical point of water (374 °C and 22.1 MPa) [11]. At these conditions, and as a result of the loss of hydrogen bonding, water is completely miscible with organic compounds and oxygen.…”

Section: Introductionmentioning

confidence: 99%

Landfill leachate treatment by batch supercritical water oxidation

Cardona¹,

Buitrago²,

Acosta

2017

Cien.Ing.Neogranadina

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were measured in the reactor effluent samples and the combined effect of the studied factors was analyzed by means of the Analysis of Variance (ANOVA). Optimal operation conditions for TOC destruction were 400°C, 30 min and 100 % OE, being 500°C, 30 min and 100 % OE for TN destruction. Contrary to what has been reported in similar studies, the results suggest that it is possible to accomplish the simultaneous TOC and TN destruction in leachate wastewater by SCWO treatment at 400°C, 100 % OE and residence times longer than 30 min and without using a catalyst, either in batch or in a continuous process, as long as both the oxidant and the wastewater are mixed and heated together at the reaction temperature.Keywords: Landfill leachate, SCWO, TOC destruction, Total Nitrogen destruction. rEsumENEl tratamiento de lixiviados por medio de diferentes procesos fisicoquímicos y biológicos ha sido ampliamente estudiado. Sin embargo, ningún proceso logra las eficiencias de destrucción requeridas en cuanto a materia orgánica y nitrógeno, razón por la cual el tratamiento se realiza por medio de tecnologías combinadas. La oxidación en agua supercrítica o SCWO, proceso que se lleva a cabo a temperaturas y presiones superiores a las del punto crítico del agua en presencia de una fuente de oxígeno, se ha aplicado exitosamente al tratamiento de distintos tipos de aguas residuales de forma eficiente. Por lo tanto, este trabajo presenta un estudio experimental de la oxidación en agua supercrítica de lixiviados de relleno sanitario en un reactor batch, en el rango de temperatura de 400-500°C, tiempos de reacción de 15 a 30 minutos y excesos de oxígeno (OE) de 100 % a 300 %. Se midieron las eficiencias de destrucción de carbono orgánico total (COT) y nitrógeno total (NT), y se determinó el efecto combinado de los factores estudiados por medio del Análisis de Varianza (ANOVA). Las condiciones de operación óptimas para la destrucción de COT fueron 400°C, 30 min y 100 % OE, y 500°C, 30 min y 100 % OE para el NT. A diferencia de lo reportado en estudios similares, los resultados sugieren que es posible llevar a cabo la destrucción simultánea del COT y el NT en los lixiviados por medio de SCWO a 400°C, 100 % OE y tiempos de residencia de más de 30 min sin usar un catalizador, ya sea en un proceso batch o continuo, siempre y cuando tanto el oxidante como el agua residual se mezclen y se calienten juntos a la temperatura de reacción.Palabras clave: Lixiviados, SCWO, destrucción de COT, destrucción de nitrógeno total.

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Hydrothermal oxidation: Application to the treatment of different cutting fluid wastes

Cited by 58 publications

References 8 publications

Supercritical water oxidation of flammable industrial wastewaters: economic perspectives of an industrial plant

Supercritical water oxidation of flammable industrial wastewaters: economic perspectives of an industrial plant

Oxidation of Dyeing Sludge in Supercritical Water

Landfill leachate treatment by batch supercritical water oxidation

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