The fate of nitrogen in supercritical-water oxidation

Killilea, William R.; Swallow, Kathleen C.; Hong, Glenn T.

doi:10.1016/0896-8446(92)90044-k

Cited by 92 publications

(69 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nitrogen is typically converted to N, or N,O. Unlike incineration, SCWO rarely produces NO, or SO, in detectable quantities because of the comparatively low temperatures used in SCWO (Thomason et al, 1990;Killilea et al, 1992;Tirnberlake et al, 1982). One exception is the report of high levels of NO, in the effluent from the oxidation of TNT and other explosives with hydrogen peroxide .…”

Section: Oxidation Reactionsmentioning

confidence: 98%

Reactions at supercritical conditions: Applications and fundamentals

et al. 1995

View full text Add to dashboard Cite

Section: Oxidation Reactionsmentioning

confidence: 98%

Reactions at supercritical conditions: Applications and fundamentals

et al. 1995

View full text Add to dashboard Cite

“…Under these conditions organics are rapidly oxidized to carbon dioxide and water (Modell, 1989). The technology is currently being investigated by numerous government organizations Moore and Simonson, 1993;Rice et al, 1993;Buelow et al, 1990), universities (Savage and Smith, 1995;Tester et al, 1993;Gloyna, 1989;Johnston and Haynes, 1987;Klein et al, 1990, Dixon andAbraham, 1992;Brennecke and Eckert, 1989), and private industry (Modell, 1985;Killilea et al, 1992;Barner et al, 1992;McBrayer and Griffith, 1995) as a non-polluting alternative to other waste-disposal techniques such as incineration and biological treatment.…”

Section: Introductionmentioning

confidence: 97%

Numerical analysis and data comparison of a supercritical water oxidation reactor

Kochan

Beller

1997

AIChE Journal

View full text Add to dashboard Cite

Supercritical water oxidation of isopropyl alcohol was investigated in a pilot-scale reactor. A computationalfluid-dynamics model developed reveals the detailed flow field, chemical-component distribution, temperature distribution, and salt-particle trajectories in the reactor flow domain. The near-wall fluid temperature from the numerical analysis was compared with experimental temperature data. The temperature comparison was within a 3% error band. The effect of the chemical kinetic rate was investigated for four different rates. Turbulent salt-particle trajectories were also calculated to investigate the effect of particle sizes on salt deposit on the wall. Also, a method of calculating the adiabatic reaction temperature was developed to estimate reaction temperatures prior to a full numerical simulation.

show abstract

“…9 shows the positive effects of temperature and time, which suggest the optimal operation conditions for achieving a high TN destruction efficiency are 500 °C, 30 min reaction time and 100 % oxygen excess. Although temperature effect was found insignificant for TOC destruction when working at residence times longer than 15 min, ammonia-nitrogen (NH 3 -N), formed as a stable intermediate compound in the oxidation of nitrogen-containing components, is a well-known recalcitrant compound and usually requires temperatures higher than 600 °C in the SCWO process [6], [31]- [33]. In fact, it has been suggested the ammonia oxidation to nitrogen or nitrous oxide is the rate limiting step in the global oxidation [7].…”

Section: Total Nitrogen Anovamentioning

confidence: 99%

Landfill leachate treatment by batch supercritical water oxidation

Cardona¹,

Buitrago²,

Acosta

2017

Cien.Ing.Neogranadina

View full text Add to dashboard Cite

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.

show abstract

The fate of nitrogen in supercritical-water oxidation

Cited by 92 publications

References 3 publications

Reactions at supercritical conditions: Applications and fundamentals

Reactions at supercritical conditions: Applications and fundamentals

Numerical analysis and data comparison of a supercritical water oxidation reactor

Landfill leachate treatment by batch supercritical water oxidation

Contact Info

Product

Resources

About