Supercritical water oxidation of polychlorinated biphenyls using hydrogen peroxide

Hatakeda, Kiyotaka; Ikushima, Yutaka; Sato, Osamu; Aizawa, Takafumi; Saito, Norio

doi:10.1016/s0009-2509(98)00392-3

Cited by 83 publications

(40 citation statements)

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“…Hydrogen peroxide decomposition in supercritical water produces OH radical, which is extremely reactive. However, it is also very unstable and rapidly decomposes to oxygen [25], [26].…”

Section: Materials and Analytical Methodsmentioning

confidence: 99%

“…Veriansyah et al [20] reported the SCWO of wastewater from liquid crystal display (LCD) manufacturing process, which contains a wide variety of organic pollutants and chromium. A COD conversion greater than 99.99 % was obtained at 615°C, 25 MPa, 998 % oxygen excess and 10 s residence time and more than 97% chromium in the wastewater was recovered as chromium oxide. Marulanda and Bolaños [15] studied the SCWO of a heavily PCB-contaminated transformer oil in a continuos process.…”

Section: Introductionmentioning

confidence: 97%

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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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“…Hydrogen peroxide decomposition in supercritical water produces OH radical, which is extremely reactive. However, it is also very unstable and rapidly decomposes to oxygen [25], [26].…”

Section: Materials and Analytical Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Landfill leachate treatment by batch supercritical water oxidation

Cardona¹,

Buitrago²,

Acosta

2017

Cien.Ing.Neogranadina

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“…Oxygen ions migrated to the matrix and combined with the chromium to form chromium oxide. In contrast to other metal elements like Fe, Cr, Mo, the Ni usually presents a worst serious depletion and the highest concentration of nickel is detected in the corrosion effluent, especially in acidic chlorinated solution (26,40,46,52,58,66,93,99,100). The pure chromium presents greater corrosion rate than Inconel 625 in supercritical water containing HCl, NaCl and H 2 O 2 (52).…”

Section: Nickelmentioning

confidence: 99%

Corrosion Properties of Candidate Materials in Supercritical Water Oxidation Process

Tang

Wang

Qian

et al. 2016

Journal of Advanced Oxidation Technologies

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Abstract:Corrosion of constructional materials in supercritical water oxidation (SCWO) is one of the main obstacles to commercializing the SCWO process. Statistical analysis of corrosion research results indicate nickel-based alloys are the most widely applied materials in SCWO system among the candidate metals. The present paper reviews the corrosion characteristics of iron-base alloy, nickel-based alloy, titanium-base alloy, ceramics, niobium, tantalum, thallium and gold under the condition of SCWO. The selection scheme of materials is presented in SCWO system flow diagram in detail. The effects of alloying elements on the corrosion behavior of materials in the water environment with high temperature and high pressure water are summarized in this paper. Moreover, some further researches for material corrosion in SCWO process are also proposed. All work was contributed to selecting the appropriate constructional materials and reducing the corrosion damage in SCWO system.

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“…In the supercritical water oxidation literature, most of the interest has been given to the destruction of the extremely toxic and possibly carcinogenic polychlorinated biphenyls (PCBs) (Hatakeda et al, 1999, Anitescu and Tavlarides, 2000, Weber et al, 2002, O'Brien et al, 2005, Marulanda and Bolaños, 2010, which were widely used in electrical transformers due to their insulating properties and resistance to thermal, chemical and biological degradation. SCWO of PCBs has been proposed as an alternative to incineration.…”

Section: Introductionmentioning

confidence: 99%

Reacting flow simulations of supercritical water oxidation of PCB-contaminated transformer oil in a pilot plant reactor

Marulanda

2011

Braz. J. Chem. Eng.

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-The scale-up of a supercritical water oxidation process, based on recent advancements in kinetic aspects, reactor configuration and optimal operational conditions, depends on the research and development of simulation tools, which allow the designer not only to understand the complex multiphysics phenomena that describe the system, but also to optimize the operational parameters to attain the best profit for the process and guarantee its safe operation. Accordingly, this paper reports a multiphysics simulation with the CFD software Comsol Multiphysics 3.3 of a pilot plant reactor for the supercritical water oxidation of a heavily PCBcontaminated mineral transformer oil. The proposed model was based on available information for the kinetic aspects of the complex mixture and the optimal operational conditions obtained in a lab-scale continuous supercritical water oxidation unit. The pilot plant simulation results indicate that it is not feasible to scale-up directly the optimal operational conditions obtained in the isothermal lab-scale experiments, due to the excess heat released by the exothermic oxidation reactions that result in outlet temperatures higher than 600°C, even at reactor inlet temperatures as low as 400°C. Consequently, different alternatives such as decreasing organic flowrates or a new reactor set-up with multiple oxidant injections should be considered to guarantee a safe operation.

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Supercritical water oxidation of polychlorinated biphenyls using hydrogen peroxide

Cited by 83 publications

References 0 publications

Landfill leachate treatment by batch supercritical water oxidation

Landfill leachate treatment by batch supercritical water oxidation

Corrosion Properties of Candidate Materials in Supercritical Water Oxidation Process

Reacting flow simulations of supercritical water oxidation of PCB-contaminated transformer oil in a pilot plant reactor

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