Sludge dewatering
First Claim
1. 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,central shaft means along the axis of said filter-dewatering shell, the distance between said shaft means and said shell being a constant maximum distance in said initial portion and decreasing in said succeeding portion to a minimum in said terminal portion,wiping, compressing, and filter-cake-discharging means secured to said shaft means and wiping the inner surfaces of said shell,power means for rotating said shaft means,nozzle means on the outer edge of said wiping, compressing, and filter-cake-discharging means facing said shell, andfluid supply means for supplying said nozzle means with fluid for cleaning out said means for exit.
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Accused Products
Abstract
A filter-dewatering-expression apparatus. Rotating helical blades of a screw conveyor compress and squeeze liquid from the sludge within structure which permits the liquid to escape therefrom, and discharge the dewatered solids out the end. The filter-dewatering medium which is held rigid by a frame may be a series of hoops or rings, separated and closely spaced, or may be a continuous wire, semicircular in cross section, closely wound into a coil, or may be a perforated screen. An imperforate filtrate collection housing surrounds this medium, and a vacuum pump is connected to the filtrate housing. A coil-spring wiping or cleaning blade may be held on the outside edge of the helical blade of the screw conveyor for continuous contact with the inside surface of the filter-dewatering medium, cleaning solids therefrom. Cleaning nozzles project out radially from the outer edge of the helical blades of the screw conveyor, spaced to discharge under pressure, a forceful blast of the air or other gas, steam, or water into the open area of the medium, to positively dislodge material therein and keep the medium unplugged, non-blinded, clean, and open. Air or steam may be added to the sludge within the structure by ports located in the screw conveyor shaft. A removable spiral shaft wrap may be rotated over and wound around, covering the screw conveyor shaft within the structure, threading the helical blade, to vary the inside configuration of the dewatering press. A plural-section screw conveyor may be utilized within the press, each section being capable of being rotated at different speeds of rotation.
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Citations
48 Claims
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1. A device for dewatering sludge, including in combination:
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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, central shaft means along the axis of said filter-dewatering shell, the distance between said shaft means and said shell being a constant maximum distance in said initial portion and decreasing in said succeeding portion to a minimum in said terminal portion, wiping, compressing, and filter-cake-discharging means secured to said shaft means and wiping the inner surfaces of said shell, power means for rotating said shaft means, nozzle means on the outer edge of said wiping, compressing, and filter-cake-discharging means facing said shell, and fluid supply means for supplying said nozzle means with fluid for cleaning out said means for exit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A device for dewatering sludge, including in combination:
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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. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A device for dewatering sludge, including in combination:
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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. - View Dependent Claims (29, 30, 31, 32)
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33. A device for dewatering sludge, including in combination:
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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. - View Dependent Claims (34)
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35. A device for dewater sludge, including in combination:
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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. - View Dependent Claims (36)
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37. A device for dewatering sludge, including in combination:
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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. - View Dependent Claims (38, 39, 40)
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41. A device for dewatering sludge, including in combination:
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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. - View Dependent Claims (42, 43, 44, 45, 46)
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47. A device for dewatering sludge, including in combination:
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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. - View Dependent Claims (48)
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Specification