NOVELTY - Treatment of organic slurry involves separating the slurry into a solid fraction and a liquid fraction; treating the liquid fraction via anoxic microbial digestion process and aerobic microbial digestion process; and filtering the liquid fraction during the aerobic process.    USE - For treatment of organic slurry, to obtain/extract from the slurry, a solid fraction, which is useful as a biomass fuel, as a feed for fluidized bed reactor, and as a biomass material for combustion to produce energy for heat or generation of electricity (claimed); useful for treating organic slurry (e.g. animal manure slurry such as pig slurry, industrial waste and agricultural waste), to recover extracted solids used as high-energy biomass renewable energy source.    ADVANTAGE - The method for treating organic slurry provides increased volumetric loading rates, reduced reactor volume, reduced retention time, high solids retention time and reduced solids production. The method reduces the time taken for denitrification, nitrification and reduction of harmful pollutants to harmless products; efficiently removes very high dissolved organic matter, nitrogen and phosphorus loads; reduces biological oxygen demand (BOD) and chemical oxygen demand (COD) of effluent, up to 98%; and eliminates the need for waste lagoons and/or land application, while treating animal manure slurries. While treating the organic slurries having low solids content, such as wastewater, the slurry need not be separated initially for removal of solids, and can be treated directly.    DETAILED DESCRIPTION - Treatment of organic slurry involves separating the slurry into a solid fraction and a liquid fraction; treating the liquid fraction via anoxic microbial digestion process and aerobic microbial digestion process; and filtering the liquid fraction during the aerobic process, preferably by passing the liquid fraction through a membrane. The anoxic microbial digestion process uses metabolizing facultative anaerobic denitrifying bacteria. The aerobic microbial digestion process uses metabolizing nitrifying bacteria. The separation of solid fraction is performed by adding a coagulant/flocculant to the slurry, for agglomeration of particles present in the slurry. The flocculant comprises a polymer in form of powder, beads, emulsions and/or liquids/dispersions; and is preferably cationic for binding with anionic components in the slurry, to form an insoluble flocculant. The treatment of liquid fraction involves removing suspended solids by induced air flotation; or removing nitrogen and/or phosphorus compounds by dosing the liquid fraction with magnesium chloride or other salts. The treatment of liquid fraction preferably involves recycling the liquid fraction between the aerobic process and the anoxic process. An INDEPENDENT CLAIM is included for an apparatus (10) for treatment of organic slurry, comprising a reactor (20) containing an outer vessel (22) in which anoxic processing of a liquid fraction of the slurry is carried out, and an inner vessel (24) in which aerobic processing of the liquid fraction is carried out; where the vessels are in liquid communication with each other, and a membrane (28) is preferably located in the second vessel for filtering the liquid fraction.    DESCRIPTION OF DRAWING(S) - The figure shows a side-elevational view of an apparatus for treating an organic slurry.    Apparatus (10)    Slurry reservoir (12)    Centrifugal decanter for separation of solid fraction (14)    Liquid fraction tank (18)    Reactor (20)    Outer vessel (22)    Inner vessel (24)    Transfer pipe (26)    Membrane (28)    Apparatus outlet. (30)