Classifications

• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F11/00—Treatment of sludge; Devices therefor
  • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
  • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
  • C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
  • B01D29/76—Handling the filter cake in the filter for purposes other than for regenerating
  • B01D29/80—Handling the filter cake in the filter for purposes other than for regenerating for drying
  • B01D29/82—Handling the filter cake in the filter for purposes other than for regenerating for drying by compression
  • B01D29/824—Handling the filter cake in the filter for purposes other than for regenerating for drying by compression using pistons
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B9/00—Presses specially adapted for particular purposes
  • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
  • B30B9/04—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams
  • B30B9/06—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams co-operating with permeable casings or strainers
  • B30B9/062—Extrusion presses
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B9/00—Presses specially adapted for particular purposes
  • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
  • B30B9/04—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams
  • B30B9/06—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams co-operating with permeable casings or strainers
  • B30B9/067—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams co-operating with permeable casings or strainers with a retractable abutment member closing one end of the press chamber
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B9/00—Presses specially adapted for particular purposes
  • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
  • B30B9/26—Permeable casings or strainers

Definitions

• the invention relates to a method of liquid expelling of mixtures or materials containing liquid, such as draining and/or dewatering of sludge by compressing the material, e.g. sludge with a piston, which is permeable to liquid.
• the invention moreover relates to a apparatus for expelling liquid from mixtures or materials, which contains liquid, such as dewatering of sludge by compressing a liquid permeable piston.
• Dewatering of sludge is typically used in connection with e.g. emptying of septic tanks.
• sewer cleaning vehicles or gully emptiers are typically used, which are customized trucks, which contain the necessary remedies for the emptying process, such as e.g. pumps, reservoir tank etc.
• a dewatering unit which expels liquid from sludge by compressing the sludge with a piston, which is in the top, similarly to the pressure surface, provided with holes, through which liquid from the sludge can be channeled out when the piston compresses the sludge.
• the liquid permeable piston which is known from DE 299 04 504 has in practice turned out to be inappropriate to use for most types of sludge, since the holes in the top of the piston are clogged by the sludge.
• the object of the invention is achieved by a method of the type stated in the introductory portion of claim 1 , which is characterized in that the piston on the pressure surface consists of a liquid permeable gap filter where the gaps for liquid expelling creates a transition between one or several fastened pins and one or several movable piston parts.
• the advantage is achieved that the gap filters can be made self- cleaning, which adds to stabilize the efficiency of the process, increase the dependability and reduce maintenance costs of the new dewatering unit.
• the piston on the side surface which is parallel with the piston's direction of movement, consists of a filter, which is permeable to liquid, e.g. in the shape of parallel gaps.
• the invention also relates to a product.
• This product is characterized in that the piston is provided with liquid permeable gap filters, which can automatically be cleaned by movement or by built-in jet nozzles and by the piston being controlled by hydraulics, which is mounted in a regenerative piping.
• the advantage is achieved that the total capacity of the gully emptier is increased to a high extent.
• Fig. 1 shows a principle sketch of the dewatering unit, where the liquid permeable piston is in the rearmost position.
• Fig. 2 shows a principle sketch of the dewatering unit, where the liquid permeable piston is in a forward movement and is compressing sludge.
• Fig. 3 shows a principle sketch of the dewatering unit, where the liquid permeable piston is in the frontal position.
• Fig. 4 shows a principle sketch of the dewatering unit, where the liquid permeable piston is in a backwards movement.
• Fig. 5 shows a principle sketch of an air operated pinch valve in closed state.
• Fig. 6 shows a principle sketch of an air operated pinch valve in open state.
• Fig. 7 shows, in a cross section, a principle sketch of the liquid permeable piston, where a movable holed plate in the piston's pressure surface is depicted in a forward placed position.
• Fig. 8 shows, in a cross section, a principle sketch of the liquid permeable piston, where a movable holed plate in the piston's pressure surface is depicted in a retracted position.
• Fig. 9 shows, seen at an angle from the front, the cylindrical side surface of the liquid permeable piston.
• Fig. 10 shows a segment of the piston's liquid permeable side surface.
• Fig. 11 shows a principle sketch of the cleaning of an inspection window, mounted in a reservoir tank for collection of sludge.
• fig. 1 is with 1 shown a dewatering unit, where a liquid permeable piston 11 compresses sludge, which is lead to the dewatering unit via the feed inlet 7.
• the sludge is lead to a pre-dewatering chamber 6, where the water in the sludge can be removed from the sludge by penetration with the piston's 11 liquid permeable side surface, and be channeled away from the dewatering unit 1 via the drain 9.
• the piston 1 is, as indicated with the arrow 10, shown in its most backward position.
• the dewatering unit 1 is provided with gaskets 5 and 8, which are partly used for sealing around the piston, but at the same time it rubs clean the piston, when it is moved.
• gaskets solid gaskets manufactured in a polymeric material can be used, and so-called non-return flap gaskets can also be used.
• the sludge is moved from the pre- dewatering chamber 6 to a so-called pressing chamber 4, where the compressed sludge 2 is gathered radially along the internal side surfaces of the pressing chamber 4, or forms a clog in front of the piston after falling down from the compressing chamber's 4 upper part, as a result of the force of gravity.
• the dewatering unit's 1 outlet pipe is blocked by a valve 3, which in a preferred embodiment is a so-called pinch valve.
• the pinch valve 3 has the specific characteristic that it first opens, when the pressure from the compressed sludge 2 in the pressure chamber 4 exceeds a given pressure.
• This characteristic of the air operated pinch valve 3 means that the compressed sludge 2 can first be separated from the pressure chamber 4, when it has been compressed to a pressure, which is equal to or greater than the opening pressure of the pinch valve 3.
• the piston compresses the sludge 12 to reach a pressure, which makes it possible to open the outlet valve 3, after which the dewatered sludge 13 can be removed from the dewatering unit 1.
• the total dewatering efficiency can in this way be adjusted by adjusting the opening pressure on the pinch valve 3.
• the liquid can be conducted away by penetration of the piston's 11 pressure surface, which is provided with gap filters, but it can also be removed through the side surface of the piston 11 , which is parallel to the piston's direction of movement, and which can also be provided with filters, which are permeable to liquid.
• fig. 3 is shown the same principle sketch of the dewatering unit as in fig. 1 and fig. 2, but in fig. 3, the piston 11 is depicted in the frontal position indicated by the arrow 10. In the frontal piston position, the compression of the sludge 12 is thus completed.
• fig. 4 is shown the same principle sketch of the dewatering unit, which also founds the basis of fig. 1 to fig. 3, but in fig. 4, the piston is shown in a backwards movement, as indicated by the arrow 10.
• the piston 11 can be driven by several types of transmissions, including electrical linear actuators, but in a preferred embodiment, the movement of the piston is controlled by hydraulics.
• fig. 5 a principle sketch of a pinch valve, which in a preferred embodiment is used as an outlet valve 3 in a dewatering unit 1.
• the pinch valve consists of a bellow 15, which as in fig. 5 blocks the entrance opening 17 from the exit point opening 18.
• the bellow 15 blocks with a specific pressure of a pressing air, gas or liquid, supplied via the valve 16.
• fig. 6 In fig. 6 is shown a principle sketch of the pinch valve, which is also shown in fig. 5, but where the valve is now open, as indicated by the arrow 19.
• the pinch valve opens when the pressure at 17 or 18 exceeds the internal pressure in the bellow 15, which is made by supply of a pressure creating medium through the valve 16.
• the drawing in fig. 7 shows, in a cross section, the principle of the piston 11.
• the piston pressure surface 20 consists of a movable circular holed plate 23, which can be moved between a number of filter pins 21.
• the filter pins 21 are in a continuous interaction with each its hole in the holed plate 23, but the holed plate can me moved in relation to the pins 21 by activating the drive shaft 25, which can be powered by a hydraulic cylinder 26.
• the liquid, which is removed from the sludge through the gaps 22 in the piston's pressure surface 20 are conducted away from the piston surface 20 via the drain pipe 41.
• the piston's external side surface 27 is shaped like a series of parallel gap sieves, which follows parallel to the piston's 11 direction of movement.
• the sieves as the mentioned parallel gap sieves in the piston's 11 side surface 27, can be cleaned automatically by applying jet nozzles 28.
• jet nozzles 28 Via the jet nozzles 28, which can be placed on one or several means of mounting such as pipe pieces 29, liquid such as water can with pressure wash and/or flush the sieves clean from the internal side of the piston 11.
• the drawing fig. 10 shows a section of the edge of the surface 27 of the piston 11 , which is shown in fig. 9. As it is seen from fig. 10, the parallel liquid permeable gaps in the piston's surface 27 emerge as the gaps between parallel placed rods 31.
• the rods 31 are wedge-shaped, so that they are narrowed towards the center axis of the filter surface 27.
• the parallel rods 31 which are the surface of the piston 11 , are as shown in fig. 10 in a preferred embodiment mounted on a series of parallel rings 30, placed internally in the piston 11.
• FIG. 11 is in a cross section shown a principle sketch of an inspection window for e.g. the tank of a gully emptier, which stores sludge under underpressure.
• the tank with underpressure has a side wall 32, which separates the internal side 35 from its outer side 34, from which it is often necessary to inspect the inner side of the tank 35.
• the tank typically contains liquid 36 and slurry parts 27.
• On the tank wall is, mounted in a fastening device 38, an inspection window 33, through which the content of the tank reservoir can be visually inspected.
• the inspection window 33 can consist of glass or other materials such as transparent polymers.
• the dewatering unit can also be provided with cleaning- and inspection hatches, where the inspection hatches are manufactured in a transparent material such as a polymer.
• the inspection hatches are in a preferred embodiment mounted from the inside with sealing strips, which compresses and thereby increases the sealing, when the pressure increases in the dewatering unit. In order to ease mounting and dismantling of the inspectional hatches, these are manufactured to be oblong.
• the invention is not limited to the embodiments, which can directly be derived from the present invention and the present drawings, but also includes all embodiments, which indirectly can be derived from the description and the drawings or by a combination of these.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Hydrology & Water Resources (AREA)
• Environmental & Geological Engineering (AREA)
• Water Supply & Treatment (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Treatment Of Sludge (AREA)
• Filtration Of Liquid (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=37570121

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (11)

Family Cites Families (3)

• 2006
  • 2006-03-28 WO PCT/DK2006/000172 patent/WO2006136156A1/en active Application Filing
  • 2006-03-28 EP EP06722865A patent/EP1907095A1/en not_active Withdrawn
• 2007
  • 2007-12-03 NO NO20076204A patent/NO20076204L/no not_active Application Discontinuation

Non-Patent Citations (1)

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