Sludge dewatering

A device for dewatering sludge, including in combination:

• a filter-dewatering shell having an initial portion, a succeeding portion, and a terminal portion, each comprising a series of longitudinally and closely spaced-apart generally circular loops that present a smooth inner surface interrupted only by the space between successive loops,
• support means aligning and retaining all said loops in place,
• filtrate collection means outside said shell and spaced therefrom for collecting filtrate,
• central shaft means along the axis of said filter-dewatering shell, the distance from said shaft means to said shell being constant in said initial and terminal portions, the distance being shorter in said terminal portion than in said initial portion, the distance between said shaft means and said shell varying in said intermediate portion between the distance in said initial portion to that of said terminal portion,
• wiping, compressing, and filter-cake-discharging means secured to said shaft means in said initial, succeeding, and terminal portions, and wiping the inner surfaces of said loops,
• power means for rotating said shaft means,
• nozzle means on said wiping, compressing, and filter-cake-discharging means facing spaces between said loops, and
• fluid supply means for supplying said nozzle means with fluid for cleaning out said spaces between loops.

A device for dewatering sludge, including in combination:

• a filter-dewatering shell having an initial portion, a succeeding portion and a terminal portion, each comprising a series of longitudinally and closely spaced-apart generally circular loops that present a smooth inner surface interrupted only by the space between successive loops,
• support means aligning and retaining all said loops in place,
• filtrate collection means outside said shell and spaced therefrom for collecting filtrate,
• central shaft means along the axis of said filter-dewatering shell, the distance from said shaft means to said shell being greatest and being constant in said initial portion and diminishing in said succeeding portion to a smaller constant distance in said terminal portion,
• conveying and wiping means secured to said shaft means in said initial and succeeding portions, and wiping the inner surfaces of both said initial and succeeding portions,
• power means for rotating said shaft means,
• nozzle means on said conveying and wiping means facing the spaces between said loops, and
• fluid supply means for supplying said nozzle means with fluid for cleaning out said spaces between loops.

A device for dewatering sludge, including in combination:

• a filter-dewatering shell having an initial portion, a succeeding portion and a terminal portion, each comprising means for exit of fluid and retention of solid particles,
• filtrate collection means outside said shell and spaced therefrom, for collecting filtrate,
• a main shaft along the axis of said filter-dewatering shell in said initial and succeeding portions and having a reduced-diameter portion in said terminal portion in said terminal portion,
• a secondary shaft rotatably mounted on said reduced-diameter portion of said main shaft in said terminal portion,
• a main sludge compression blade secured to said main shaft in said initial and succeeding portions, said blade providing means for wiping the inner surfaces thereof,
• a filter-cake-discharging blade secured in said terminal portions to said secondary shaft,
• power means for rotating said shafts at different speeds relative to each other,
• nozzle means on said main blade, and
• fluid supply means for supplying said nozzle means with fluid for cleaning out said means for exit.

A device for dewater sludge, including in combination:

• a filter-dewatering shell having an initial portion, a succeeding portion and a terminal portion, each comprising means for exit of fluid and retenrion of solid particles,
• filtrate collection means outside said shell and spaced therefrom, for collecting filtrate,
• a main shaft along the axis of said filter-dewatering shell in said initial portion having a reduced-diameter portion in said succeeding portion and said terminal portion,
• a secondary shaft rotatably mounted on said reduced-diameter portion of said main shaft in said succeeding and terminal portions,
• a main sludge compression blade secured to saiid main shaft in said initial portion, and having means for wiping the inner surfaces thereof,
• sludge compession and filter-cake-discharging blade secured in said succeeding and terminal portions to said secondary shaft,
• power means for rotating said shafts at different speeds relative to each other,
• nozzle means on said main wiping blade, and
• fluid supply means for supplying said nozzle means with fluid for cleaning out said means for exit.

A device for dewatering sludge, including in combination:

• a filter-dewatering shell having an initial portion, a succeeding portion, and a terminal portion, each comprising a perforate housing having an interior surface and a screen supported on said interior surface and itself having an inner surface,
• filtrate collection means outside said shell and spaced therefrom for collecting filtrate,
• central shaft means along the axis of said filter-dewatering shell, the distance from said shaft to said shell being constant in said initial and terminal portions, the distance being shorter in said terminal portion than in said initial portion, the distance between said shaft and said shell varying in said intermediate portion between the distance in said initial portion to that of said terminal portion,
• wiping, compressing, and filter-cake-discharging means secured to said shaft means in said initial, succeeding, and terminal portions, and wiping the inner surfaces of said screen,
• power means for rotating said shaft means,
• nozzle means on said wiping, compressing, and filter-cake-discharging means facing said screen, and
• fluid supply means for supplying said nozzle means with fluid for cleaning out the screen.

A device for dewatering sludge, including in combination:

• a filter-dewatering cylindrical shell comprising a series of longitudinally and closely spaced-apart generally circular loops that present a smooth inner surface interrupted only by the space between successive loops,
• support means aligning and retaining all said loops in place,
• filtrate collection means outside said shell and spaced therefrom for collecting filtrate,
• a central shaft along the axis of said filter-dewatering shell and having an initial portion, a succeeding portion, and a terminal portion, said shaft being cylindrical in said initial portion and frustoconical in said intermediate portion, enlarging to a maximum diameter in said terminanl portion,
• wiping, compressing, and filter-cake-discharging means secured to said shaft in at least said initial and succeeding portions, and wiping the inner surfaces of said loops,
• power means for rotating said shaft,
• nozzle means on said wiping, compressing, and filter-cake-discharging means facing the spaces between said loops, and
• fluid supply means for supplying said nozzle means with fluid for cleaning out said spaces between loops.

A device for dewatering sludge, including in combination:

• a filter-dewatering shell having an initial portion, a succeeding portion and a terminal portion, each comprising a series of longitudinally and closely spaced-apart generally circular loops that present a smooth inner surface interrupted only by the space between successive loops,
• said loops being metal with radial side walls, one of which has a groove therearound,
• spring loaded wire means seated in said groove and yieldingly extending into said space between successive loops,
• support means aligning and retaining all said loops in place,
• filtrate collection means outside said shell and spaced therefrom for collecting filtrate,
• vacuum means outside said shell connected to said filtrate collection means,
• central shaft means along the axis of said filter-dewatering shell, the distance from said shaft means to said shell being greatest and being constant in said initial portion and diminishing in said succeeding portion to a smaller constant distance in said terminal portion,
• wiping, compressing, and filter-cake-discharging means secured to said shaft means and wiping the inner surfaces of at least said initial and succeeding portions,
• power means for rotating said shaft means,
• cleaning blades mounted on said wiping, compressing, and filter-cake-discharging means and extending into the spaces between loops and forcing said spring loaded wire means to yield during rotation of said shaft means,
• nozzle means on said wiping, compressing, and filter-cake-discharging means facing the spaces between said loops, and
• fluid supply means for supplying said nozzle means with fluid for cleaning out said spaces between loops.