NOVELTY - Process for converting a carbon containing feedstock into at least one useful material, comprises: (a) preparing a slurry from the feedstock; (b) reacting the slurry in a first reaction to produce a stream comprising at least one solid product, and at least one liquid product, and water; (c) separating the solid product, water and liquid product from the stream; and (d) converting the liquid product into at least one useful material.    USE - The process is useful for: converting a carbon containing feedstock into at least one useful material, where the feedstock comprises agricultural waste (comprising cellulose, hemicellulose, lignin, starch, oligosaccharides and/or monosaccharides), animal processing waste, municipal sewage sludge, municipal solid waste and shredder residue; and generating useful materials including a liquid hydrocarbon fuel from carbon containing feedstocks (all claimed). The process is useful for converting waste and other organic feedstock into sustainable energy, feed, fuel, fertilizers, specialty chemicals and other useful products.    ADVANTAGE - The process is sustainable recycling process; and is technical, economical and environmental friendly. The method and apparatus can handle mixed streams of various feedstocks e.g. agricultural waste and municipal solid waste, to yield gas, oil, specialty chemicals and carbon solids.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a process for generating useful materials including a liquid hydrocarbon fuel from carbon containing feedstocks, comprising: decomposing the feedstock to substantially separate organic and inorganic materials in it; removing solid and gaseous fractions produced during the decomposing to form a liquid mixture; hydrolyzing the liquid mixture; separating solids, gases and vapors, and water from the hydrolyzed liquid mixture to form a hydrocarbon liquid; and conditioning the hydrocarbon liquid to form at least a hydrocarbon fuel;    (2) a process for conversion of shredder residue into at least carbons solids and a liquid hydrocarbon fuel, comprising: decomposing the shredder residue by application of heat and pressure to produce solids including fixed carbon and a hydrocarbon containing liquid mixture; separating the solids from the liquid mixture; fractioning the liquid mixture based on weight to produce at least higher and lower molecular weight fractions; hydrolyzing the higher molecular weight fractions of the liquid mixture by further application of heat and pressure to produce a hydrolyzed hydrocarbon liquid and water mixture: separating entrained solids particles from the hydrolyzed hydrocarbon liquid and water mixture; and separating water from the hydrolyzed hydrocarbon liquid to form a liquid hydrocarbon fuel; and    (3) a decomposition reactor system, comprising: a reaction chamber with an open bottom; a conveyor housing disposed at least partly below the chamber and defining an opening communicating with the chamber open bottom, where the conveyor housing has a length and exit opposite the opening; a biased closed cover (3013) over the conveyor housing exit; a screen section (3012) in the conveyor housing disposed between the opening and exit, where the screen section is configured and dimensioned to permit passage of liquids through it while preventing passage of at least substantially all solids; a conveyor disposed within the conveyor housing, where the conveyor extending is from the chamber open bottom to a point within the housing spaced from the housing exit; a first vessel configured to receive liquids communicating with the conveyor housing screen section; and a second vessel communicating with the conveyor housing exit configured to receive solids carried over the screen section from the conveyor.    DESCRIPTION OF DRAWING(S) - The figure shows a decomposition reactor system.    Airlock chamber (3002)    Conveyor section (3010)    Heated screw (3011)    Screen section (3012)    Biased closed cover. (3013)