Abstract: An apparatus is provided for oxidizing an aqueous suspension of organic matter at elevated pressure. The apparatus has a reactor and an inlet for the aqueous suspension which is introduced to an upstream end of the reactor. A device for circulating the aqueous suspension through the reactor. An inlet for an oxygen containing gas introduced to the aqueous suspension. An outlet for removing treated aqueous suspension from a downstream end of the reactor and a static mixer vane arrangement for splitting, rearranging and combining the aqueous suspension as the circulating device circulates the aqueous suspension through the reactor. The improvement comprises withdrawing the treated aqueous suspension from the downstream end of the reactor and combining a major portion thereof with fresh incoming aqueous suspension. The circulating device returns the combined aqueous suspension to the reactor via the inlet for the aqueous suspension.

Abstract: Process and apparatus for the oxidation of an aqueous suspension of organic matter at elevated temperature and pressure is disclosed. The organic matter is oxidized in a reactor having a reaction zone consisting of static mixer vane arrangement. The oxidized matter and oxygen-containing gas are circulated through the static mixer to promote the oxidation of the organic matter in reducing COD to the desired level.

Abstract: A process for oxidizing an aqueous suspension of organic matter at elevated temperature and pressure includes exposing the organic matter to an oxygen-containing gas in a reactor for a period sufficient to reduce chemical oxygen demand of the organic matter to a predetermined desired level. An aqueous suspension of organic matter and bubbles of oxygen containing gas is split, rearranged and combined by an arrangement of vanes within the reactor core.