Supercritical Water Oxidation for Environmentally Friendly Treatment of Organic Wastes

Abstract

Supercritical water oxidation is a promising, environment-friendly technology to efficiently deal with a wide variety of organic wastes such as wastewaters, industrial and municipal sludge, etc. As for the two key problems, i.e., corrosion and salt plugging, generally encountered in supercritical water oxidation plants, this chapter firstly reported the related mechanism analysis, solutions, research status, and development trends, respectively. From the perspectives of corrosion prevention and control, safety and automatic control, economic improvements, and development of novel reactors, a number of advanced technologies and equipment such as on-line desalination in supercritical water, new operation scheme assisted secondary traditional treatment, produced-gas recovery and oxygen reuse and novel TWM reactor, etc., were introduced systematically. Finally, this chapter summarizes the implementation status of industrial plants and the technological features of several firms being active in the construction of full-scale supercritical water oxidation plants. This chapter will provide very valuable information for the researchers and engineers who are interested in supercritical water oxidation for the harmless treatment of organic pollutants.

On the modeling and simulation of coupled adsorption and thermosolutal convection in supercritical carbon dioxide

“…SCF potential applications have known an increasing involvement and significant progress in a wide range of industrial technologies, for instance in various pharmaceutics sectors related to natural substances extraction of biological interest [1][2][3], agrofood fields [4][5][6][7], energy [8], and waste treatment sectors [9][10][11][12][13][14]. Supercritical carbon dioxide (scCO 2 ) significance has grown fairly quickly in the past decades.…”

Liquid “Syngas” Based on Supercritical Water and Graphite Oxide/TiO2 Composite as Catalyst for CO2 to Organic Conversion

“…Such situation stimulates significantly investigations of CO 2 capture and storage in water [1][2][3]. It is known that the water in supercritical state allows to dissolve gases in much larger concentration [4,5]. This supercritical state is associated with disaggregation of large waterclusters into smaller ones or even single water molecules due to the fact that hydrogen bonds are partially broken under the influence of different physical factors including high temperature and pressure in autoclaves, cold plasma, ultrasound, ionizing radiation, and laser light.…”

Review on an Advanced Combustion Technology: Supercritical Hydrothermal Combustion

“…In 1982, Massachusetts Institute of Technology(MIT) scholar Modell first proposed the SCWO based on the phenomenon that organic matters and oxygen could completely mix and rapidly reacted with each other in supercritical water. In the next three or four decades, this technology has achieved fruitful results in the harmless treatment of organic wastewater and sludge [2], and several research institutes and commercial companies have promoted the commercialization of SCWO in waste treatment [3][4][5].…”

“…(4) Division of the ignition process and explanation of the ignition mechanism from the perspectives of critical physical properties, heat transfer and mixing. (5) Discussion and forecast of the industrial applications from aspects of hydrothermal spallation drilling, thermal recovery of heavy oil, clean conversion and utilization of coal-based fuel and harmless treatment of pollutants. Its skeleton is arranged from experimental equipment to industrial applications, from combustion characteristics to ignition mechanism, and from summary conclusions to prospect prediction.…”