NOVELTY - An organic waste treatment system (100) comprises a biomixer (130); a first screening apparatus (115) including a screen mesh; a hydropulper (140); and a hydrocyclone (145). The biomixer converts a first portion of the organic waste materials into a partially hydrolyzed biomass. The first screening apparatus screens the partially hydrolyzed biomass into unders that pass through the screen mesh. The hydropulper receives the unders from the first screening apparatus, and creates a slurry from it. The hydrocyclone removes grit from the slurry.    USE - As a system for converting organic waste materials of municipal solid waste, to biogas and residual solid (claimed); useful for converting organic waste materials (e.g. yard waste, food waste, paper and organic fraction of municipal solid waste) into a uniform biomass suitable for conversion to products such as fuels, biogas and residual solid used for producing compost.    ADVANTAGE - The system uses the biomixer, hydropulper and hydrocyclone, along with the screening apparatus and sorting facility, so that the organic waste materials are progressively reduced in size and cleaned of contamination. The system converts the organic waste materials into a uniform biomass, which is suitable for conversion to useful products such as fuels, and is suitable for anaerobic digestion to produce biogas and the residual solid used for producing high-quality compost.    DETAILED DESCRIPTION - An organic waste treatment system (100) comprises a biomixer (130); a first screening apparatus (115) including a screen mesh; a hydropulper (140); and a hydrocyclone (145). The biomixer converts a first portion of the organic waste materials into a partially hydrolyzed biomass. The first screening apparatus screens the partially hydrolyzed biomass into unders that pass through the screen mesh. The hydropulper receives the unders from the first screening apparatus, and creates a slurry from it. The hydrocyclone removes grit from the slurry. The system further comprises a second screening apparatus (135) including a screen mesh, to screen a second portion of the organic waste materials into unders that pass through the screen mesh, and overs that do not pass through the screen mesh; and optionally a grinder (120) to grind the unders from the screening apparatus. The hydropulper receives the unders from the second screening apparatus; or receives the ground unders from the grinder. The first and second screening apparatuses preferably include trommels. The system further comprises a sorting facility (110) such as a sorting floor/line, to remove undesirable materials from the organic waste materials; an anaerobic digester (150) to receive the slurry; and a compost facility (160) to receive residual solids from anaerobic digester.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a system for treatment of organic waste materials.    Organic waste treatment system (100)    Sorting facility (110)    Screening apparatuses (115, 135)    Grinder (120)    Biomixer (130)    Hydropulper (140)    Hydrocyclone (145)    Anaerobic digester (150)    Compost facility. (160)