Naßoxidation — Ein Beitrag zum Stand der Technik

Wet air oxidation – Present‐day technology. Wet air oxidation is a process of flameless “incineration”, especially of organic compounds, in an aqueous phase with air or other oxidants at relatively high temperatures and pressures. Existing applications such as the sanitizing of sewage sludge, processing of sludges from pulp production, and regeneration of activated charcoal are described. At present, waste water purification by wet air oxidation is being propagated. Difficult degradation of some pollutants enforces the use of temperatures up to 330°C and pressures up to 250 bar. The high investment costs for such plants, which require materials like titanium or hastelloy to handle corrosive wastes, often result in higher operating costs than with other methods, in spite of low energy consumption. Once the effectiveness of existing plants has been proved, especially regarding corrosion problems, rising demands for waste water purification may render wet air oxidation increasingly important.