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Supercritical water oxidation was used for the treatment of oily wastewater generated as a consequence of steel production. Following a reaction at 430°C, a pressure of 40 MPa for 150 seconds, wastewater oil content was reduced to 2 mg/L, equivalent to a 97.7% reduction rate, allowing for the reuse of the wastewater. In addition, the reaction kinetics was determined to be first order with the integral...
Transpiring wall reactor is a promising engineering solution to corrosion and salt precipitation for the technology of supercritical water oxidation. Characteristics of flow conditions and species concentrations in the reactor and around the transpiring wall are hardly accessible to measurements. So a computational fluid dynamic model of the transpiring wall reactor was developed. The influence of...
Supercritical water oxidation (SCWO) was first proposed almost 20 years ago as a potential organic waste treatment technology. In this paper, the energy-conversion system of supercritical water oxidation is built up in terms of a transpiring-wall reactor, in which the glucose-water solution is used to mimic the organic liquid-waste. Additionally, considering mass and energy conservations, the calculation...
Alkans was selected and its oxidation in supercritical water was investigated. The experimental results showed that when the reaction temperature is 420??C, pressure is 24 MPa, the residence time is 10 min, and the alkane removal of oilfield sludge could reach 96.4%. The residence time and reaction temperature are the main factors for alkanes removal of oilfield sludge. The removal increases with...
In this article, removal efficiencies of BOD and COD of landfill leachate was investigated using supercritical water oxidation (SCWO) process. Under different circumstances -high pressure, high temperature, wet air oxidation (WAO), sub-critical water and SCWO- experimental results were obtained. Organic compounds were almost completely removed when the pressure was above 30 Mpa, and temperature was...
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