Wet oxidizer for the treatment of anaerobic gases in sewage treatment plants for deodorization and disinfection, also after biological and denitrification stages. Suitable for mercaptan removal in fermenters and anaerobic pumping stations. Optionally equipped with an AOP system for splitting aromatics. The system features a self-priming water jet to avoid the use of a fan and reduce energy consumption. The oxidation principle works without chemicals and is completely sustainable.