NOVELTY - A 10-150 m3 acid-resistant vessel is 3-6 m in diameter and 3-8 m high. It includes a plastic flat conical roof (6.1) and a conical base in metal or concrete. Also included are an upper working platform at the upper edge (6.5) internal lighting (6.4), level sight glass (6.3), inspection ports (6.2), and a pressure relief valve (6.6). Centrally in the lower half, 10 cm above the base is a tube (4) causing an injection recirculation flow (5). This is closed at the top and has side holes for the 80-95% liquid waste, promoting good mixing between floating foam and suspended matter, under pumped (2) recirculation.    USE - A digester for diverse wastes, capable of aerobic and/or anaerobic operation and bio-gas production.    ADVANTAGE - The equipment, an ANOX-bioreactor, can be used individually for rapid waste breakdown with subsequent separation of a virtually odor-free fluid, used for liquid manure or other purposes. Biogas production with partial or complete purification is feasible. Any waste water with organic residues from industry, agriculture and domestic sources can be treated. The treatment process is accelerated.    DETAILED DESCRIPTION - High in the tank there is a transverse channel overflow unit (7). A downcomer (8) outside the vessel is connected to the pump, to break up floating and suspended matter entrained. By closing the oxygen supply line (102) to form a closed circuit, operation is converted from aerobic to anaerobic. This creates in effect, a small biogas production plant. The single external pump with suitable drive, is operated at intervals. A gas off take line is connected to the top of the vessel. This can be used for venting or flaring-off weak gas. A gas mixture recirculation line (10.1) is connected at the top of the vessel and to the liquid recirculation line (3, 8). A hot air system (10.4) is connected to the injector (10.3) and gas recycle system, or directly into the venturi system. All solids are mixed into the fluid by the venturi injector (10). Provision is made for fluid additive preparation, and to pump liquid away from the base of the vessel. An overflow line from about 2/3 of the filling height, enters at 9/10 of the filling height in the next vessel. A methane gas line is connected to a block power generator. A 38 degrees C warm water wetting system is installed, for the entire outer wall of the vessel, and has a lower interception channel connected to a pump and heat exchanger (131) for temperature equalization and upward recirculation.    DESCRIPTION OF DRAWING(S) - The figure shows a vertical cross-section through the plant.    Pump (2)    Liquid recirculation line (3, 8)    Tube (4)    Recirculation flow (5)    Roof (6.1)    Inspection ports (6.2)    Sight glass (6.3)    Internal lighting (6.4)    Upper edge (6.5)    Pressure relief valve (6.6)    Overflow unit (7)    Downcomer (8)    Venturi injector (10)    Gas mixture recirculation line (10.1)    Oxygen supply line (10.2)    Injector (10.3)    Hot air system (10.4)    Heat exchanger (13.1)