NOVELTY - A purification plant for the treatment of liquid manure using a stirrer and then passed through a filter screen and press to remove solids. The liquid filtrate is passed through a long flocculating trough, sedimented, treated with aluminum chloride and filtered through silica and diatomaceous earth before being subjected to aeration and oxidation.    USE - The separated solids are rich in phosphorus and nitrogen, making them suitable for use as organic fertilisers.    ADVANTAGE - The plant takes up a smaller surface area and offers faster separation compared with sedimentation tanks, and is less energy intensive than an installation using centrifugal filters or filter belts.    DETAILED DESCRIPTION - A purification plant for the treatment of liquid manure comprises a high capacity collection and storage tank (1) for the manure, from which the manure is pumped to a conditioning pit (4) equipped with a stirrer (5), and then passed through a group of solid separating devices consisting of a rotary filter screen (6) and a press (7) for compacting and removing solids. The remaining liquid is passed through a long flocculation trough (9) that leads into a pumping pit (12), from which liquid is pumped into a high capacity sedimentation tank (14), then into a purification and clarifying tank (15) to which aluminium chloride is added, and then to a flow regulating tank (16). Liquid leaving this tank passes through a pair of filters (18, 19) containing silica and diatomaceous earth particles, then through a group of four aeration and pre-oxidation chambers or tanks (21), and then into a group of four chambers or tanks (22) where the final oxidation step is carried out.    DESCRIPTION OF DRAWING(S) - Figure 1 shows a schematic diagram of the purification plant.    Manure collection tank (1)    Pump (2)    Piping (3)    Conditioning pit (4)    Stirrer (5)    Rotary filter screen (6)    Press (7)    Piping (8)    Flocculation trough (9)    Flocculating agent dispenser tanks (10)    Pump (11)    Pumping pit (12)    Pump (13)    Sedimentation tank (14)    Purification tank (15)    Flow regulating tank (16)    Housing for filter screen, press and flocculating agent dispenser tanks (17)    Silica and diatomaceous earth particle filters (18, 19)    Piping (20)    Aeration and pre-oxidation chambers (21)    Final oxidation chambers (22)    Ozone generator (23)