Also, an accurate evaluation of the thermo-physical properties is needed, and, therefore, the interest in a state equation (EOS) capable of describing SCWO systems is growing. Precise values of density, viscosity, enthalpy, and heat capacity are required for both water and aqueous mixtures in order to obtain accurate results of this type of model. Models have been developed that take into account mass, momentum and energy balances to promote the understanding of sub-and supercritical systems, their scaling and reaction heat integration. Interest in modeling of the SCWO processes has grown in recent years. Įstimating the thermodynamic properties of aqueous systems in the vicinity of the critical water point is, therefore, a challenging task. The gas effluent is also clear, carbon monoxide content is just a few parts per million and as the result of the almost low temperatures of the SCWO process (400–650 ☌), none of the NOx compounds are generated compared to the incineration process (900–1300 ☌). Under these new conditions, water acquires new advantages by ensuring a single-phase reaction medium without limitations to transfer, an increase in reaction and pollutant oxidation rates (elimination efficiencies that can reach 99.99%), and the final liquid effluent is non-toxic and can be discharged without treatment. At these conditions, water became a perfect medium for reaction due to its low density, low viscosity, low dielectric constant and high diffusivity and miscibility with organics and oxygen.
The supercritical water oxidation (SCWO) process is based on the oxidation of waste in supercritical water conditions. Supercritical water oxidation (SCWO) is a waste treatment method that can convert hazardous organics completely and quickly into water and carbon dioxide.
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