Supercritical Water Oxidation for Toxic Organic Wastewater Disposal

The destruction of toxic organic wastewaters from munitions demilitarization and complex industrial chemicals clearly becomes an overwhelming problem if left to conventional treatment processes. Two options, incineration and supercritical water oxidation (SCWO), exist for the complete destruction of toxic organic wastewaters. Incinerator, on the one hand, has associated problems such as very high cost and public resentment; SCWO, on the other hand, has proven to be a very promising method for the treatment of various types of wastewaters with its extremely efficient organic waste destruction of 99.99% with none of the emissions associated with incineration. In this review, the concepts of SCWO, the results of and present perspectives on its applications, as well as the industrial status of SCWO are critically examined and discussed.

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Corrosion Performance of Metals for Supercritical Water, Oxidation-Utilized Organic Waste-Processing Reactors

CORROSION ◽

10.5006/1.3278276 ◽

2006 ◽

Vol 62 (5) ◽

pp. 383-394 ◽

Cited By ~ 14

Author(s):

N. Saito ◽

Y. Tsuchiya ◽

Y. Akai ◽

H. Omura ◽

T. Takada ◽

...

Keyword(s):

Supercritical Water ◽

Water Oxidation ◽

Organic Waste ◽

Waste Processing ◽

Supercritical Water Oxidation ◽

Corrosion Performance

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Supercritical Water Oxidation of Organics Wastewater a with a Novel Transpiring-Wall Reactor

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.531.300 ◽

2012 ◽

Vol 531 ◽

pp. 300-303

Author(s):

Feng Ming Zhang ◽

Chun Yuan Ma

Keyword(s):

Supercritical Water ◽

Water Oxidation ◽

Organic Waste ◽

New Technology ◽

Methanol Solution ◽

Supercritical Water Oxidation ◽

Outlet Concentration ◽

Oxidation Of Organics

Supercritical water oxidation (SCWO) is a new technology for treating organic waste and recovering energy. This paper focuses on supercritical water oxidation of organics wastewater with a novel transpiring-wall reactor, and methanol solution was used as artificial wastewater. A coaxial burner allow the transition of the preheating of the feed from external to internal which prevent the plugging in the preheating section. The results show that methanol can be destructed completely with the outlet concentration of total organics carbon (TOC) was lower than 10 ppm. Higher temperatures are present inside the reactor at higher flux ratios of Ffeed/Fhot.

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Supercritical Water Oxidation of Organic Waste in an In-Ground Reactor

10.2172/1244377 ◽

1988 ◽

Author(s):

Bruce A. Robinson

Keyword(s):

Supercritical Water ◽

Water Oxidation ◽

Organic Waste ◽

Supercritical Water Oxidation

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Supercritical water oxidation: Fundamentals and reactor modeling

Chemical Industry and Chemical Engineering Quarterly ◽

10.2298/ciceq0702079b ◽

2007 ◽

Vol 13 (2) ◽

pp. 79-87 ◽

Cited By ~ 10

Author(s):

María Bermejo ◽

Daniel Rincón ◽

Victoria Vazquez ◽

María Cocero

Keyword(s):

Supercritical Water ◽

Water Oxidation ◽

Construction Materials ◽

Point Of View ◽

Supercritical Water Oxidation ◽

General Description ◽

Reactor Modeling ◽

Complete Destruction ◽

Complete Miscibility ◽

Very High

Supercritical water oxidation (SCWO) is a technology that takes advantage of the special solvation properties of the water above its critical point (374?C, 22.1 MPa), to achieve a complete destruction of organic wastes. The oxidation of the organics dissolved in supercritical water (SCW) can be carried out in an homogeneous phase due to the complete miscibility of oxygen with SCW. If the temperature is high enough (above 650?C) a complete destruction of a large variety of organics can be achieved with residence times lower than one minute. Although the energy consumption of the SCWO is very high, with an appropriate heat integration system, the process can be energetically self-sufficient or even produce an excess of energy. The two main challenges of the SCWO are corrosion problems and salt deposition. These problems can be overcome by the use of special construction materials and adequate reactor designs. Due to the high cost of the construction and operation of these reactors, the development of simulations is of great interest. This work gives a brief description of the process and its present challenges, focusing on the calculation of the physical properties of the water and its mixtures, and on the description of the kinetics from an engineering point of view, to finish with a short general description of the state of art in SCWO reactor modeling.

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