The recovery channel (5) is connected to the lower part of the reception tank (1). Diverse organic materials of defined properties are deposited into the base of the reception tank, where they form a floating, low-density filter, which always rests on the upper part of the slurry, and arrives progressively at the lowest part of the reception tank. It forms a layer partitioning the slurry from the atmosphere. It permits aerobic- and anaerobic transformation phases. At the same time, nauseous odors evolved, are retained. An Independent claim is included for the corresponding method of operation. Preferred features: The reception tank (1) is pumped (6) to two outlets. The first has a filter (2), the second is connected to a gravel- or sand filter (3). The filter provides compost (16) and cloudy, greasy water. This is collected in a storage unit (9). The sand filter produces clear water, recovered in a storage unit (8), both storage units being constructed in water-tower form. A cartridge filter (4) and non-return valves are provided for clear water (8) utilization. The reception tank is formed in two separate parts with a sealed vertical partition. Each includes an inclined plane connected to the recovery channel, common to both parts. Each is designed for frontal, mechanized filling.
