Waste treatment, supercritical water extraction

The committee also believes that commercially available hazardous waste incinerators should be suitable for final treatment of neutralents, although test burns may be necessary. Some neutralents are high in sodium, which tends to shorten the life of the refractory brick used to line incinerators, but wastes of similar composition have been treated satisfactorily. Commercial hazardous waste facilities are available that offer other technologies that might be better for aqueous wastes. These technologies include biological treatment, supercritical fluid extraction (not to be confused with supercritical water oxidation, discussed later in this chapter) followed by incineration of the smaller volume of extracted organics, and chemically based proprietary processes. 

Direct or technology use use of C02 with different technologies and market applications such as use for oil recovery, for dry cleaning, waste carbonation, food, water treatment or extraction with supercritical C02 compounds, including others. 

Indeed, the most novel approach to decaffeinate green coffee beans, which has attained industrial application, is supercritical fluid extraction (SFE) using carbon dioxide CO Supercritical CO2 is selective for the extraction of caffeine, there is no associated waste treatment of a toxic solvent and extraction times are moderate. Moreover, supercritical CO2 coupled with ethanol or water was investigated to extract caffeine Ifom green tea leaves. 

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