NOVELTY - The arrangement comprises a vessel for processing organic waste, an inlet for feeding organic waste into the vessel, an outlet (5) for discharging processed organic waste in the form of reject from the vessel, a supporting unit comprising a support structure (8) for carrying organic waste in the vessel, a moving unit (10) for moving organic waste on the support structure in the vessel, a second supplying unit for supplying gas into the vessel, and a gas discharging unit for discharging exhaust gas.    USE - The arrangement is useful for processing organic waste such as: household waste (all claimed) including fruits and vegetables, meat, poultry, and seafood, eggshells, rice, beans, cheese, bones, plants and flowers; mineral oils; and packaging material such as waxed cardboard products, frozen/refrigerated food boxes, napkins, paper towels, paper plates, milk cartons, tea bags, coffee grounds and filters, parchment and waxed papers.    ADVANTAGE - The air proof, safe and compact arrangement efficiently processes the organic waste with reduced emissions of greenhouse gas.    DETAILED DESCRIPTION - The arrangement comprises a vessel for processing organic waste, an inlet for feeding organic waste into the vessel, an outlet (5) for discharging processed organic waste in the form of reject from the vessel, a supporting unit comprising a support structure (8) for carrying organic waste in the vessel, a moving unit (10) for moving organic waste on the support structure in the vessel, a second supplying unit for supplying gas into the vessel, and a gas discharging unit for discharging exhaust gas. The supplying unit is configured to direct gas into organic waste carried on the support structure. The vessel comprises a top comprising the inlet for feeding organic waste into the vessel, a bottom (30) comprising the outlet for discharging processed organic waste, and support structures. The moving unit is configured to move organic waste fed via the inlet into the vessel in direction from the inlet to the outlet from a support structure to another support structure to partly prevent incoming organic waste to mix with organic waste present in the vessel. The arrangement further comprises a recovering unit for recovering reject, a condensing unit for removing moisture from exhaust gas, a pre-treatment unit for processing organic waste to be fed into the vessel, a monitoring unit for monitoring the process, and an insulation unit for thermally insulating the vessel. The moving unit comprises blades having different blade angles on each support structure, and is further configured to move and turn over organic waste on the support structure at the same time and configured to move organic waste from a center of the support structure to the edge of the support structure or from the edge of the support structure to the center of the support structure. The supplying unit comprises a pipe unit projecting from the support structure, and is configured to feed air or oxygen. The pre-treatment unit includes a crushing unit, a heating unit, and a cooling unit. An INDEPENDENT CLAIM is included for a method of processing organic waste.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a reaction vessel.    Outlet (5)    Support structure (8)    Moving unit (10)    Rotating unit (14)    Bottom. (30)