In described embodiments, a method of processing sludge of a poultry plant into solids includes storing sludge in a tank where the sludge is a dissolved air floatation (DAF) float treated with Polymer Chemistry. A polymer is added to the sludge to produce a slurry that is separated into at least one liquid phase and solids in a horizontal decanter centrifuge having a weir ring. In conjunction with operating the centrifuge with a laminar flow, adjusted feed rate and polymer dosing, the system allows for production of low moisture solids (<50%) from the poultry plant DAF float and discharge of a clear liquid phase.

A solid-bowl screw centrifuge has a rotatable drum with cylindrical and conical portions. At least one solid discharge is arranged in the conical portion of the drum. A screw is arranged in the drum and can rotate at a differential speed in relation to the rotatable drum. At least two drum bearings are used for mounting the drum in a housing and at least one screw bearing is used for mounting the screw in the drum. The drum and the screw mounting are designed in the region of the conical portion or the dry zone in such a way that solid matter is transported with the aid of the screw up to a solid-discharge drum cover, which forms the termination of the conical portion in the axial direction of the drum, in order to leave the drum through multiple openings in the solid-discharge drum cover.

A solid-bowl screw centrifuge has a rotatable drum with cylindrical and conical portions. At least one solid discharge is arranged in the conical portion of the drum. A screw is arranged in the drum and can rotate at a differential speed in relation to the rotatable drum. At least two drum bearings are used for mounting the drum in a housing and at least one screw bearing is used for mounting the screw in the drum. The drum and the screw mounting are designed in the region of the conical portion or the dry zone in such a way that solid matter is transported with the aid of the screw up to a solid-discharge drum cover, which forms the termination of the conical portion in the axial direction of the drum, in order to leave the drum through multiple openings in the solid-discharge drum cover.

A dewatering machine includes a screen, a screw and at least one moisture content control wing. The screen has a hollow inside, has an inlet portion through which livestock manure is inputted at a first side and an outlet portion through which dehydrated livestock manure is outputted at a second side, and has a plurality of moisture exhaust holes penetrating from an inside of the screen to an outside of the screen. The screw includes a rotation axis and a main wing formed into a spiral shape along a longitudinal direction of the rotation axis. At least one moisture content control wing is disposed between the main wings adjacent to the outlet portion, and is formed into a spiral shape along the longitudinal direction of the rotation axis.

A dewatering machine includes a screen, a screw and at least one moisture content control wing. The screen has a hollow inside, has an inlet portion through which livestock manure is inputted at a first side and an outlet portion through which dehydrated livestock manure is outputted at a second side, and has a plurality of moisture exhaust holes penetrating from an inside of the screen to an outside of the screen. The screw includes a rotation axis and a main wing formed into a spiral shape along a longitudinal direction of the rotation axis. At least one moisture content control wing is disposed between the main wings adjacent to the outlet portion, and is formed into a spiral shape along the longitudinal direction of the rotation axis.

A feed box for a decanter centrifuge has a housing with a hollow interior, the housing having a top with an inlet therethrough, a bottom, sides, and opposing open ends, wherein the inlet and the open ends are in fluid communication with the hollow interior. A liner shaped complementary to the hollow interior of the housing, has a top, a bottom, sides, opposing ends, an opening through the top of the liner below the inlet, and a channel through the liner between the opposing ends in fluid communication with the inlet.

A feed box for a decanter centrifuge has a housing with a hollow interior, the housing having a top with an inlet therethrough, a bottom, sides, and opposing open ends, wherein the inlet and the open ends are in fluid communication with the hollow interior. A liner shaped complementary to the hollow interior of the housing, has a top, a bottom, sides, opposing ends, an opening through the top of the liner below the inlet, and a channel through the liner between the opposing ends in fluid communication with the inlet.

Methods and systems for separating liquid components are disclosed. A vessel is provided containing a solids conveyance device. At least a first portion of the vessel acts as an indirect-contact heat exchanger and a second portion of the vessel contains a filter. A process liquid stream, containing a first component and a second component, is passed into the first portion of the vessel. A portion of the second component is frozen and entrained in the first portion of the vessel into the process liquid stream, resulting in a process slurry stream. The process slurry stream is passed into a second portion of the vessel by the solids conveyance device. The process slurry stream is separated into a solid product stream and a primary liquid product stream by passing the primary liquid product stream through the filter and out of the vessel while separately removing the solid product stream out of the vessel.

Methods and systems for separating liquid components are disclosed. A vessel is provided containing a solids conveyance device. At least a first portion of the vessel acts as an indirect-contact heat exchanger and a second portion of the vessel contains a filter. A process liquid stream, containing a first component and a second component, is passed into the first portion of the vessel. A portion of the second component is frozen and entrained in the first portion of the vessel into the process liquid stream, resulting in a process slurry stream. The process slurry stream is passed into a second portion of the vessel by the solids conveyance device. The process slurry stream is separated into a solid product stream and a primary liquid product stream by passing the primary liquid product stream through the filter and out of the vessel while separately removing the solid product stream out of the vessel.

The invention relates to an outlet device (10) of a solid-bowl screw centrifuge for separating a multi-phase material, which outlet device is arranged on an end wall (12) of a centrifuge drum, which rotates about a longitudinal axis, at an outlet opening (20) formed in the end wall, which outlet device comprises a diverting channel (22) for diverting a liquid phase of the material which passes through the outlet opening (20), wherein the diversion relative to the longitudinal axis amounts to an angle (32) between 50° and 90° with respect to the circumferential direction, and which outlet device has an aligned rectilinear weir edge (30) for limiting the emergence of the liquid phase, wherein the angle of the alignment of the weir edge (30) relative to the end wall (12) as viewed from the outlet opening (20) amounts to between 0° relative to the end wall and minus 6° toward the end wall.