Classifications

• • 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
• • 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
  • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
  • B01D29/114—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for inward flow filtration
• • 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
  • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
  • B01D29/117—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for outward flow filtration
• • 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
  • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
  • B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
  • B01D29/54—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection arranged concentrically or coaxially
• • 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
  • 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
  • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
  • B01D29/94—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes

Definitions

• the present invention relates to an apparatus for draining sludge, in particular for use on a mud exhauster vehicle which is used for emptying septic tanks but which also may be used stationary in connection with small water purifica ⁇ tion plants and the like.
• septic tanks serve as fermentation tanks where solids from household sewage water are retained and partially precipitated such that the sewage water dischar ⁇ ged from the septic tanke is purified to a certain extent.
• the accumulated sludge must be removed from the septic tank at regular intervals, for example once a year, and disposed of in a satisfactory way, for example by deposition on a certified waste dump or combustion in a refuse combustion plant.
• the dry matter content in the sludge in a septic tank is typically between 1% and 3%, and it is in principle only this dry matter which must be removed from the tank.
• the predominant part by far of the sludge which is trans- * ported to the waste dump or refuse combustion plant is wa ⁇ ter which it would not be necessary per se to remove from the septic tank.
• this purpose i ⁇ attained with an apparatus which is charac ⁇ terized in that a filter press with a ring-shaped press chamber in the apparatus has a ring-shaped press piston which may be advanced within the press chamber for squee ⁇ zing the sludge and thereafter retracted again, that the sludge is fed to the filter pres ⁇ from a forechamber, the pre ⁇ s piston during its retraction opening a passage from the forechamber to the press chamber and during its advan ⁇ cement closing the pas ⁇ age again, that the apparatu ⁇ is provided with a piston pump coupled to feed sludge from a reservoir to the forechamber, and that the piston of the pump is coupled to the pre ⁇ s piston in such a way that the pump feeds sludge to the forechamber during each retraction of the pre ⁇ piston.
• a filter pres ⁇ with a ring- shaped pre ⁇ chamber i ⁇ used for the draining of the sludge is provided.
• a filter pre ⁇ i ⁇ in principle known from Da- ni ⁇ h patent no. 37726, but in thi ⁇ known filter pre ⁇ the material to be pressed is to be urged down into the pres ⁇ chamber by means of a rotating arm; therefor one must as ⁇ sume that it will be unusable for draining sludge from ⁇ ep- tic tanks as the latter flows too lightly.
• a filter press with a ring-shaped pres ⁇ room can be used for drai ⁇ ning sludge when it i ⁇ provided with a ring-shaped press piston.
• the sludge cannot escape from the pressure and because of the ring shape of the pres ⁇ chamber the water must only travel a short way in order to leave the sludge.
• the sludge feeding must be adapted to the stro ⁇ king work cycle of such a filter press, however, and it is shown to be advantageous in this instance to feed the sludge from a . reservoir to a forechamber by means of a pi ⁇ ston pump whose piston is coupled to the piston of the press piston.
• the coupling is such that the pump operates during the return stroke of the pre ⁇ s piston so that the capacity of the driving mechanism is exploited in an advan ⁇ tageous way.
• the feeding of ⁇ ludge to the pre ⁇ chamber i ⁇ controlled by the pres ⁇ piston itself as the latter opens and clo ⁇ es a pas ⁇ age from the forechamber to the press chamber.
• the mechanism for taking off the lid and removing the drai ⁇ ned filter cake may preferably be built as in claim 5, a ⁇ particularly the lid must be scraped completely clean so that it may be fitted tightly on the filter pres ⁇ again af ⁇ ter the evacuation of the filter cake.
• a ring- ⁇ haped pre ⁇ s piston 5 may be moved up and down in the pres ⁇ chamber 2 by a hydraulic mover mechani ⁇ m (not ⁇ hown) which co pri ⁇ e ⁇ two hydraulic cylinders that are connected to the piston 5.
• the pre ⁇ pi ⁇ ton 5 presses the material present in the press chamber against an upper lid 6 which i ⁇ retained against the pressure by a hydraulic me ⁇ chanism (hydraulic cylinder) 7.
• the liquid pre ⁇ ed out of the material in the pre ⁇ s chamber traverse ⁇ the filter cy- linder ⁇ 3 and 4 and enter ⁇ an inner drain chamber 8 and an outer drain chamber 9, re ⁇ pectively.
• the drain 10 From the bottom of the inner drain chamber 8 there a drain 10 i ⁇ led downward, the drain 10 at the same time serving as a guide for an inward ⁇ ly extending bottom collar 11 on the ring- ⁇ haped pre ⁇ pi ⁇ ⁇ ton 5.
• the ⁇ ecure guiding of the press piston 5 thus at ⁇ tained eases the tightening of the various tight-fitting surfaces.
• the inner filter cylinder 3 is longer than the outer filte cylinder 4. The lower part of the inner filter cylinder therefore protrudes from the outer filter cylinder and is surrounded by a forechamber 13 which receives sludge from piston pump 14.
• the piston pump 14 consists of a pump chamber 15 with an inlet 16 and an outlet 17, the inlet and outlet being pro ⁇ vided with check valves 18.
• a pump piston 19 which can be moved up and down in the pump chamber 15 is coupled to the press piston 5. The details of the coupling are not shown but merely indicated schematically.
• the pre ⁇ pi ⁇ ton is moved up and down in the ring-shaped inter ⁇ space 2, the stroke path of the piston being measured such that it moves substantially down to the bottom of the fore ⁇ chamber 13.
• the piston opened a pas ⁇ sage from the forechamber to the ring- ⁇ haped inter ⁇ pace 2 between the filter cylinder ⁇ , and sludge i ⁇ fed into thi ⁇ interspace by the piston pump 14.
• the piston 5 is moved upward in the ring-shaped interspace 2 whereby the water i ⁇ pressed out of the ⁇ ludge, enter ⁇ the chamber ⁇ 8 and 9 through the filter cylinder ⁇ and leaves the chambers through the drains 10 and 20.
• the press piston 5 Because it is moved by hydraulic cylinders the press piston 5 has a variable stroke length. This is important for the functioning of the press because after one or more strokes of the press pi ⁇ ton 5 there will build up a filter cake of drained ⁇ ludge having an increasing height. Thu ⁇ ⁇ ludge from a plurality of strokes is accumulated in the press chamber. The drained filter cake exerts a certain counter- pressure against the action of the piston, and the advance ⁇ ment of the piston within the pre ⁇ chamber 2 stop ⁇ by it- self when thi ⁇ counterpre ⁇ sure corresponds to the pressure in the hydraulic system which drives the pres ⁇ piston 5.
• the drained filter cake in the pre ⁇ s chamber 2 is evacuated by the hydraulic mechanism 7 lifting the lid 6 at the top of the pump so high that the lid pa ⁇ se ⁇ a ring- ⁇ haped scra ⁇ per 21.
• the filter cake i ⁇ pressed out of the ring-shaped interspace 2 by ean ⁇ of the pi ⁇ ton 5 and is guided to an accumulator funnel 23 on the side of the pi ⁇ ton pre ⁇ s I by mean ⁇ of the scraper 21 which is moved by a hydraulic e- chani ⁇ m 22. From there the drained ⁇ ludge i ⁇ fed further out of the apparatus for storage via a conveyor duct 24 which may be equipped with a screw conveyor or the like. After the evacuation of the filter cake the scraper 21 is moved back to its original place whereafter the lid 6 i ⁇ placed on the filter press 1 and the pres ⁇ ing proce ⁇ con ⁇ tinue ⁇ .
• the filter cylinders 3 and 4 are made as cylinders of woven metal supported by vertical bars which in turn are held by means of rings 25.
• the rings are only ⁇ hown for the inner filter cylinder 3, however. Con ⁇ structional details such as seals, connections etc. are no included in the drawing, to further the illustrativene ⁇ s.
• the apparatus shown is particularly suitable for integra ⁇ tion with mud exhau ⁇ ter vehicle ⁇ but may also be used ⁇ ta- tionarily for example in ⁇ mall water purification plants.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Treatment Of Sludge (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8106863

Family Applications (1)

Country Status (4)

Families Citing this family (4)

Family Cites Families (5)

• 1987
  • 1987-03-31 DK DK164787A patent/DK158149C/da not_active IP Right Cessation
• 1988
  • 1988-03-28 WO PCT/DK1988/000052 patent/WO1988007501A1/en not_active Application Discontinuation
  • 1988-03-28 EP EP88902824A patent/EP0418223A1/en not_active Withdrawn
  • 1988-03-28 AU AU15412/88A patent/AU1541288A/en not_active Abandoned

Non-Patent Citations (1)

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