EP0418223A1 - Apparatus for draining of sludge - Google Patents

Apparatus for draining of sludge

Info

Publication number
EP0418223A1
EP0418223A1 EP88902824A EP88902824A EP0418223A1 EP 0418223 A1 EP0418223 A1 EP 0418223A1 EP 88902824 A EP88902824 A EP 88902824A EP 88902824 A EP88902824 A EP 88902824A EP 0418223 A1 EP0418223 A1 EP 0418223A1
Authority
EP
European Patent Office
Prior art keywords
chamber
sludge
press
preεε
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP88902824A
Other languages
German (de)
French (fr)
Inventor
Jens Erik Gerding
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
OPTIMAL MILJOTEKNIK APS
Original Assignee
OPTIMAL MILJOTEKNIK APS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by OPTIMAL MILJOTEKNIK APS filed Critical OPTIMAL MILJOTEKNIK APS
Publication of EP0418223A1 publication Critical patent/EP0418223A1/en
Withdrawn legal-status Critical Current

Links

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.

Landscapes

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

Abstract

Un appareil de drainage de boue est constitué par une presse à filtre comportant une chambre de presse en forme d'anneau (2) couplée à une pompe à piston (14) qui achemine la boue depuis un réservoir vers une chambre antérieure (13), laquelle communique avec la chambre de presse (2). Un piston de presse à mouvement alternatif (5) placé dans la chambre de presse (2) avance pour comprimer la boue et lors du retour ouvre un passage allant de la chambre antérieure (13) à la chambre de presse (2). La pompe à pñston (14) est couplée au piston (5, 11) de la presse, de sorte que la pompe (14) achemine la boue dans la chambre antérieure (13) à chaque mouvement de retour du piston (5) de la presse. La chambre de presse (2) est entourée par des parois de filtre cylindriques (3, 4) et est fermée au sommet de la presse au moyen d'un couvercle amovible (6), lequel peut être retiré par déplacement parallèle dans la direction de l'axe central de la chambre de presse au moyen d'un mécanisme d'ouverture/fermeture. Un drain (10) pour le liquide conduit jusqu'au fond de la chambre (8) dans le cylindre de filtre intérieur (3). Le piston (5) de la presse est mû par un mécanisme hydraulique.A sludge drainage device is constituted by a filter press comprising a ring-shaped press chamber (2) coupled to a piston pump (14) which conveys the sludge from a tank to an anterior chamber (13), which communicates with the press chamber (2). A reciprocating press piston (5) placed in the press chamber (2) advances to compress the mud and upon return opens a passage going from the anterior chamber (13) to the press chamber (2). The pñston pump (14) is coupled to the piston (5, 11) of the press, so that the pump (14) conveys the mud into the anterior chamber (13) with each return movement of the piston (5) of the hurry. The press chamber (2) is surrounded by cylindrical filter walls (3, 4) and is closed at the top of the press by means of a removable cover (6), which can be removed by parallel movement in the direction of the central axis of the press chamber by means of an opening / closing mechanism. A drain (10) for the liquid leads to the bottom of the chamber (8) in the internal filter cylinder (3). The piston (5) of the press is moved by a hydraulic mechanism.

Description

APPARATUS FOR DRAINING OF SLUDGE
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.
As generally known 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. Thus 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 means that in the cleaning of septic tanks there is transported a very large volume of water al¬ though basically there is no necessity for this. It would be desirable to be able to remove most of the water from the sludge and return the water to the septic tank in order to save transportation expenses.
In fact it is rather difficult, due to the low dry matter content, to drain water from the sludge from septic tanks. The dry matter consists mainly of fibrous materials with a large pore volume, and most commonly the sludge has the consistency of a thin paste. In the draining systems as known today there is therefore added a flocculating agent (lime) such that the dry matter flocculates and precipi¬ tates to a certain degree whereafter the water is drained off from the precipitate in a succeeding treatment step.
Seen in relation to this known technique it is the purpose of the invention to provide an apparatuε for draining sludge which works entirely mechanically, that is, without the addition of consumables such as flocculating agents, and which is particularly suited for use on a mud exhauster vehicle but which also may be used at small water purifica¬ tion plants and the like.
According to the invention as set forth in patent claim 1 this purpose iε 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 presε from a forechamber, the preεs piston during its retraction opening a passage from the forechamber to the press chamber and during its advan¬ cement closing the pasεage again, that the apparatuε 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 preεs piston in such a way that the pump feeds sludge to the forechamber during each retraction of the preεε piston.
According to the invention a filter presε with a ring- shaped preεε chamber iε used for the draining of the sludge. Such a filter preεε iε in principle known from Da- niεh patent no. 37726, but in thiε known filter preεε the material to be pressed is to be urged down into the presε chamber by means of a rotating arm; therefor one must as¬ sume that it will be unusable for draining sludge from εep- tic tanks as the latter flows too lightly. Yet in accor¬ dance with the invention it has been found that a filter press with a ring-shaped presε room can be used for drai¬ ning sludge when it iε provided with a ring-shaped press piston. In this instance the sludge cannot escape from the pressure and because of the ring shape of the presε 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 preεs piston so that the capacity of the driving mechanism is exploited in an advan¬ tageous way. The feeding of εludge to the preεε chamber iε controlled by the presε piston itself as the latter opens and cloεes a pasεage from the forechamber to the press chamber.
Preferred embodiments of the invention are set forth in the εubclaimε.
Through the constructive embodiment as recited in claim 2 the pasεage from the forechamber to the preεε chamber at- tainε a large εectional area εuch that the filling happenε relatively quickly, thus in turn allowing a speedy work cycle of the the apparatus.
The draining of the waεte water through a drain from the bottom of the room within the inner filter cylinder, the drain at the same time serving as a guide for the press pi¬ ston, according to claim 3, has shown to contribute consi¬ derably to the mechanically safe functioning of the appara- tus. By providing the press with a removable lid as in claim 4 the problem of evacuating the drained filter cake is"solved in a constructionally simple way.
The mechanism for taking off the lid and removing the drai¬ ned filter cake may preferably be built as in claim 5, aε particularly the lid must be scraped completely clean so that it may be fitted tightly on the filter presε again af¬ ter the evacuation of the filter cake.
A preferred exemplary embodiment of an apparatus for the draining of sludge according to the invention will be de¬ scribed in the following with reference to the accompanying drawing, which is a simplified εectional view of the appa- ratuε.
In the drawing there is seen a filter presε 1 with a cy¬ lindrical ring-shaped presε chamber 2 which is delimited by an inner filter cylinder 3 and an outer filter cylinder 4. A ring-εhaped preεs piston 5 may be moved up and down in the presε chamber 2 by a hydraulic mover mechaniεm (not εhown) which co priεeε two hydraulic cylinders that are connected to the piston 5. The preεε piεton 5 presses the material present in the press chamber against an upper lid 6 which iε retained against the pressure by a hydraulic me¬ chanism (hydraulic cylinder) 7. The liquid preεεed out of the material in the preεs chamber traverseε the filter cy- linderε 3 and 4 and enterε an inner drain chamber 8 and an outer drain chamber 9, reεpectively. From the bottom of the inner drain chamber 8 there a drain 10 iε led downward, the drain 10 at the same time serving as a guide for an inward¬ ly extending bottom collar 11 on the ring-εhaped preεε pi¬ εton 5. The εecure 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. Aε iε apparent from the orientation of the check valveε, aε shown in the drawing, sludge is fed into the pump chamber 15 via the inlet 16 while the piston 19 is moved upward, and there iε preεεed εludge out of the pump chamber 15 and up into the fore¬ chamber 13 when the piston 19 iε moved downward.
When the apparatus shown in the drawing iε operating, the preεε piεton 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. Thereby there is above the piston opened a pas¬ sage from the forechamber to the ring-εhaped interεpace 2 between the filter cylinderε, and sludge iε fed into thiε interspace by the piston pump 14. Subsequently the piston 5 is moved upward in the ring-shaped interspace 2 whereby the water iε pressed out of the εludge, enterε the chamberε 8 and 9 through the filter cylinderε and leaves the chambers through the drains 10 and 20.
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 piεton 5 there will build up a filter cake of drained εludge having an increasing height. Thuε εludge 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 preεε chamber 2 stopε by it- self when thiε counterpreεsure corresponds to the pressure in the hydraulic system which drives the presε piston 5. It is this variability of the stroke length which ultimately enables an accumulation of εludge from a plurality of stro¬ kes in the presε chamber; thiε contributes to a conεider- able degree to an economic and effective operation because emptying has to be done correspondingly lesε often.
The drained filter cake in the preεs chamber 2 is evacuated by the hydraulic mechanism 7 lifting the lid 6 at the top of the pump so high that the lid paεseε a ring-εhaped scra¬ per 21. The filter cake iε pressed out of the ring-shaped interspace 2 by eanε of the piεton 5 and is guided to an accumulator funnel 23 on the side of the piεton preεs I by meanε of the scraper 21 which is moved by a hydraulic e- chaniεm 22. From there the drained εludge iε 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 iε placed on the filter press 1 and the presεing proceεε con¬ tinueε.
It haε turned out that with thiε apparatus the dry matter content in the εludge may be increased from a value between typically 1% and 3% to a value between typically 15% and
25%. Thus a conεiderable reduction iε attained of the vol¬ ume and the weight which must be tranεported from the place where the εludge iε collected to the place of diεpoεal.
In the embodiment shown 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 εhown for the inner filter cylinder 3, however. Con¬ structional details such as seals, connections etc. are no included in the drawing, to further the illustrativeneεs.
The apparatus shown is particularly suitable for integra¬ tion with mud exhauεter vehicleε but may also be used εta- tionarily for example in εmall water purification plants.

Claims

P tent cla ms
1. Apparatus for draining sludge, in particular for use on a mud exhauεter vehicle, with a filter preεs having a ring- shaped preεε chamber, c h a r a c t e r i z e d in that the filter press has a ring-shaped preεε piεton (5) which may be advanced within the preεs chamber (2) for squeezing the sludge and thereaf¬ ter retracted again, that the sludge iε fed to the filter preεε (1) from a forechamber (13), the preεε piεton (5) du¬ ring itε retraction opening a paεεage from the forechamber to the preεs chamber and during itε advancement cloεing the paεεage again, that the apparatuε is provided with a piston pump (14) coupled to feed sludge from a reservoir to the forechamber, and that the piston (19) of the pump iε coupled to the preεε piεton (5, 11) in such a way that the pump (14) feeds sludge to the forechamber (13) during each retraction of the preεε piεton (5).
2. Apparatuε according to claim 1, c h a r a c t e r i z e d in that the preεε chamber (2) iε delimited axially by a lid (6) placed opposite the presε piεton (5) and radially by an inner (3) and an outer filter cylinder (4), each in the form of a liquid-permeable, cy- lindrical wall, of which the outer (4) iε shorter than the inner (3), that the forechamber (13) iε εubεtantially ring- εhaped and surroundε the inner filter cylinder (3) where the latter protrudeε from the outer filter cylinder (4), and that during each εtroke the preεε piεton (5) iε pulled back so far within the forechamber (13) that thereby a ring-εhaped paεεage iε opened from the forechamber to the press chamber (2).
3. Apparatus according to claim 2, c h a r a c t e r i z e d in that the lid (6) is at the top of the filter presε, at that from below there is led a drain (10) for liquid to the bottom of the room (8) within the inner filter cylinder (3), which drain serves as a guide for a radially inward extending bottom collar (11) on the press piston (5, 11)
4. Apparatus according to one of the preceding claims, c h a r a c t e r i z e d in that the lid (6) is mounted removably so that drained sludge may me evacuated from the presε chamber (2) through an opening created by removal of the lid.
5. Apparatus according to claim 4, c h a r a c t e r i z e d in that the filter preεε (1) is provided with an opening/cloεure mechaniεm (7) for the lid adapted to diεplace the latter in parallel with the direc¬ tion of the central axis of the filter cylinderε, and pro¬ vided with a scraper mechanism (21, 22) adapted to remove evacuated drained sludge from the removed lid (6) in a di¬ rection transverse to the central axis.
6. Apparatus according to one of the preceding claims, c h a r a c t e r i z e d in that the preεs piεton (5) iε moved by a hydraulic mechaniεm εuch that the εtroke length of the preεε piεton during advancement is variably determined by the relation between the hydraulic pressure and the pressure in the drained sludge within the presε chamber (2) .
EP88902824A 1987-03-31 1988-03-28 Apparatus for draining of sludge Withdrawn EP0418223A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK164787A DK158149C (en) 1987-03-31 1987-03-31 SLAM DRAINAGE DEVICE
DK1647/87 1987-03-31

Publications (1)

Publication Number Publication Date
EP0418223A1 true EP0418223A1 (en) 1991-03-27

Family

ID=8106863

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88902824A Withdrawn EP0418223A1 (en) 1987-03-31 1988-03-28 Apparatus for draining of sludge

Country Status (4)

Country Link
EP (1) EP0418223A1 (en)
AU (1) AU1541288A (en)
DK (1) DK158149C (en)
WO (1) WO1988007501A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT393118B (en) * 1989-12-01 1991-08-26 Guggemos Horst SLUDGE DRAINAGE DEVICE
DE4032145C1 (en) * 1990-10-10 1992-01-16 Mueller Umwelttechnik Gmbh & Co Kg, 4938 Schieder-Schwalenberg, De
WO2006136156A1 (en) * 2005-05-12 2006-12-28 J.Hvidtved Larsen A/S Method and apparatus for draining of sludge.
WO2017139360A1 (en) * 2016-02-12 2017-08-17 Delta Dewatering, Llc System and method for separating solids from liquid-solid slurries

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DE357507C (en) * 1922-08-25 Maschb Anstalt Humboldt Process for dewatering the products of sludge treatment, in particular those that are omitted in the floating process, by pressing
DK37726C (en) * 1925-02-25 1927-07-18 Stoebestaalfabrikanterne Fried Press for Pressing damp Pressed goods.
US3168033A (en) * 1962-10-10 1965-02-02 Edward F Hansen Liquid-solid separating apparatus
DE1627847A1 (en) * 1967-01-26 1971-02-25 Eie Maskin Ab N A Press thickener
IT1117279B (en) * 1977-03-07 1986-02-17 Diemme Spa CONTINUOUS CYCLE DRAWER-PRESS, WITH COAXIAL PISTONS

Non-Patent Citations (1)

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Title
See references of WO8807501A1 *

Also Published As

Publication number Publication date
DK164787D0 (en) 1987-03-31
AU1541288A (en) 1988-11-02
DK158149C (en) 1990-08-27
WO1988007501A1 (en) 1988-10-06
DK164787A (en) 1988-10-01
DK158149B (en) 1990-04-02

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