NOVELTY - An animal waste supply including the waste fibers (14) is washed and dewatered. The liquid is separated from solid by shedding waste fiber, and resulting fiber is compressed to generate briquettes (26). At least one briquettes is torrefied in a torrefaction reactor (38) using a heat source at a predetermined temperature. The briquette is removed from the reactor, and reactor is cooled to enable conversion of waste fiber into solid fuel.    USE - Conversion method of waste fiber into solid fuel (claimed).    ADVANTAGE - High quantity of energy is produced from waste fiber without emitting large quantity of pollutants. The solid fuel product is easily transported and stored.    DETAILED DESCRIPTION - An animal waste supply including the waste fibers is provided in a predetermined quantity, washed for a predetermined time and dewatered by separating water from waste fibers for predetermined period. The liquid is separated from solid by shedding waste fiber, and resulting fiber is compressed to generate briquettes. At least one briquettes is torrefied in a torrefaction reactor using a heat source at a predetermined temperature for predetermined time. The briquette is removed from the reactor, and reactor is cooled to reach a predetermined cooling temperature to enable conversion of waste fiber into solid fuel. An INDEPENDENT CLAIM is included for system (10) for converting waste fibers to solid fuel, which has an agitation unit for receiving and mixing a predetermined amount of animal waste, a washing unit for washing the animal waste, a dewatering unit (22) for separating water from the waste fibers, a drum roller unit (24) for shedding the waste fibers to separate liquids from solids and allow air contact with the waste fibers, a waste fiber press unit (28) for pressing the waste fibers and moving the pressed fibers via a conveyor system to a dry storage area for additional drying using a rotary or drum drying unit, a cold briquetting device (34) for generating briquettes from the waste fibers, and a torrefaction reactor for torrefying briquettes using heat source.    DESCRIPTION OF DRAWING(S) - The drawing shows the flowchart of conversion of waste fiber into solid fuel.    Process system (10)    Fiber (14)    Dewatering device (22)    Roller system (24)    Briquettes (26)    Press (28)    Briquetting device (34)    Reactor (38)    Lid (44)