NOVELTY - The system has methane fermentation tank (6) which is provided to incorporate a flow carrier. A separation mechanism for post-process (2,10A) is configured to perform separation process into solid component and mixture of flow support and fermentation residue to discharge the mixture containing the solid component and flow support which are drawn out from methane fermentation tank, and fermentation residue. A reflux path (P2) is configured to return the flow carrier discharged from separation mechanism (10B) for post-process to methane fermentation tank.    USE - Isolated type methane fermentation system.    ADVANTAGE - The flow carrier is drawn from the methane fermentation tank of flow carrier utilization type with solid component and fermentation dreg, so that the flow carriers are recovered and returned to methane fermentation tank. The solid component is discharged smoothly to produce the clogging of the support by fixed bed system by motion of movable board portion of separation mechanism for post-process. The flow carrier is recovered reliably from screen by rotation or vertical motion of movable board portion of separation mechanism for post-process.    DETAILED DESCRIPTION - The separation mechanism (10B) for post-process is provided to separate into flow carrier and fermentation residue to discharge the mixture of flow carrier discharged from separation mechanism for post-process (2,10A), and fermentation residue. The separation mechanism for post-process is provided with screens with larger and smaller meshes than the size of flow carrier. The residue removal apparatus are configured to remove the solid component and flow carrier remained on screens. The separation mechanism for post-process (2,10A) is arranged in parallel with parallel rod objects which orthogonally cross perpendicularly or skew with respect to orthogonal direction. A flat screen surface is provided on upper surface. The solid component is moved to horizontal direction along screen surfaces by residue removal apparatus (24A) from upper surface side of screen (20A). The residue removal apparatus (24A) is provided to leave the path of flow carrier between parallel rod objects of screen (20A). A movable board portion (28) is inserted. The solid component on screen (20A) is biased to horizontal direction by motion of movable board portion. The movable board portions of residue removal apparatus (24A) are in series with rotary movable board portions (28A) pivotally supported intermittently to the longitudinal direction of parallel rod object of screen (20A). Each movable board portion is provided so as to rotate while providing longer axis and shorter axis. The axis of longer axis of adjacent movable board portions maintains orthogonal relationship, so that the path of flow carrier is ensured among movable board portions, when axis of longer axis of adjacent movable board portion is arranged in horizontal or perpendicular direction. The separation mechanism for post-process (10B) is arranged in parallel with parallel rod objects which skew in vertical direction with flat screen surface on upper surface. The flow carrier of particle shape is accelerated to move screen (20B) top to direction parallel to rod object by motion of movable board portion.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the isolated type methane fermentation system.    Separation mechanism for post-process (2,10A,10B)    Methane fermentation tank (6)    Screens (20A,20B)    Residue removal apparatus (24A)    Rotary movable board portion (28A)    Reflux path (P2)