Supercritical water oxidation research and development update

Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

“…Alternatively, low temperature oxidation processes replace oxygen by stronger oxidants such as O 3 [9,10] or H 2 O 2 [9,11,12] in combination with an energy input to form reactive OH-radicals [13,14]. Several reviews on catalytic and non-catalytic WAO [4,5,[15][16][17][18][19], supercritical water oxidation (SCWO) [7,8,[20][21][22] and advanced oxidation processes (AOP) [23][24][25] are now available in literature.…”

“…Over the last 10-15 years, continuous SCWO technology proved to be an extremely powerful treatment for all kinds and concentration range of toxic organic wastewater [7,8,[20][21][22]. Related problems with corrosion and plant plugging due to salt precipitation were solved on laboratory scale leading to new reactor configurations termed hydrothermal burner [49] and Transpiring Wall Reactor [50].…”

CO{sub 2}-based supercritical fluids as environmentally-friendly processing solvents

“…[40,41] A recent example of its application to semiconductor manufacturing wastewater is given by Tomioka et aZ, [42] who report the complete conversion of tetramethylammonium (TMA) hydroxide, used as a positive photoresist developer, into C02, H20 and N2 using a Pd catalyst in supercritical water.…”

Kinetics of Ethanol Oxidation in High-Pressure Steam

“…The oxidation can be conducted in water at conditions above or below the critical point of water (T c = 374.2 °C, p c = 22.1 MPa). The oxidation in water at a condition above the critical point is known as supercritical water oxidation (SCWO) (1) , while the oxidation using water at a condition below the critical point is referred to as subcritical wet oxidation (WO) (2) . Especially, subcritical WO in the vapour phase is known as high-pressure steam oxidation (HPSO).…”