EP0480176B1 - Procédé pour la dèshydratation sous pression de boues aqueuses - Google Patents

Procédé pour la dèshydratation sous pression de boues aqueuses Download PDF

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Publication number
EP0480176B1
EP0480176B1 EP91115039A EP91115039A EP0480176B1 EP 0480176 B1 EP0480176 B1 EP 0480176B1 EP 91115039 A EP91115039 A EP 91115039A EP 91115039 A EP91115039 A EP 91115039A EP 0480176 B1 EP0480176 B1 EP 0480176B1
Authority
EP
European Patent Office
Prior art keywords
piston
sludge
pressure
chamber
valve
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.)
Expired - Lifetime
Application number
EP91115039A
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German (de)
English (en)
Other versions
EP0480176A1 (fr
Inventor
Wolfgang Dipl.-Ing. Müller
Dirk Dipl.-Ing. Herzog
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.)
Mueller Umwelttechnik & Co KG GmbH
Original Assignee
Mueller Umwelttechnik & Co KG GmbH
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Filing date
Publication date
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Publication of EP0480176A1 publication Critical patent/EP0480176A1/fr
Application granted granted Critical
Publication of EP0480176B1 publication Critical patent/EP0480176B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/14—Drying solid materials or objects by processes not involving the application of heat by applying pressure, e.g. wringing; by brushing; by wiping
    • 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

Definitions

  • the invention relates to a method according to the type mentioned in the preamble of claim 1.
  • a known method of this type is the subject of D-C-198 415, which describes a press for removing liquid from chocolate mass, which has a cylinder jacket provided with sieve-like openings, in which a piston is slidably mounted.
  • the chocolate mass is fed to the cylinder through the piston rod alternately on one side or on the other side of the piston by means of a pump.
  • the liquid is led out through the sieve-like openings of the cylinder jacket, while the solid components are compressed at the ends of the cylinder and finally pressed out.
  • the piston is equipped with sieve openings on the end faces and has an inner chamber from which the liquid can flow outwards through a tube attached to the piston.
  • the sieve openings provided in the end faces of the piston clog very quickly, since there is no possibility of cleaning during operation.
  • the invention has for its object to design a method of the type mentioned so that a sludge cake with the same moisture distribution and a high degree of drainage is created and the entire filter surfaces are cleaned during operation.
  • the flocculant added to the raw sludge in a preliminary stage of the process creates the conditions for intensive dewatering of the sludge cake, which is promoted by the distribution of filter candles across the cross-section of the receiving chamber for the raw sludge.
  • the working pressure of the sludge pump does not have to be reduced, so that it can always run at a constant working pressure.
  • the homogeneity of the sludge cake is also advantageous, since the process is designed such that the sludge layers building up behind the piston are discharged again at approximately the same time in the order in which they are formed, thus creating a sludge cake with the same moisture distribution.
  • FIG. 1 A drawing of an exemplary embodiment of a device for carrying out the method, FIG. 1.
  • the receiving chamber 25 for example in chamber I, with raw sludge mixed with flocculant via the pump 5 through the opened valve 1, the sludge feed line 7 and the telescopic pipe 29 pumped in.
  • the piston 8 is pushed up to a mechanical stop in the direction of the empty chamber II, which is constantly reduced. Once he has reached this, raw sludge continues to be added until the desired operating pressure is reached.
  • the resulting filtrate 30 flows through the filter candles 12 into the collecting containers 13, 14 arranged in the container lids 17, 18 and is then discharged via the outlets 15, 16.
  • valve 1 closes and valve 2 opens, so that the fresh one Raw sludge 21 passes through the valve 2, the sludge feed line 9 and the telescopic tube 28 into the chamber II until operating pressure is also reached there.
  • the pressure in the chamber I not loaded with raw sludge is now generated by the piston 8 and is maintained by the fact that the discharge opening 11 provided with the discharge nozzle 27 is closed by a valve 3.
  • valve 3 opens until it has dropped to a lower, also predetermined minimum level, after which the pressure moves again up to its maximum, the lower or the maximum, due to the moving piston can be equal to the maximum working pressure of the sludge pump 6, is built up and the interplay continues until the piston 8 has reached an end position and no more sludge cake through the discharge opening 11 in the discharge nozzle 27 and through the valve 3 in the waiting container 23 can slide out. Then valve 2 is closed and valve 1 is opened and the process continues in the same way in the reverse order continuously, whereby discontinuous operation is not excluded if longer stopping times are to be realized.
  • the fresh raw sludge 21 is pumped through the valve 1 via the sludge line 7 and the telescopic tube 29 into the chamber I, the sludge being pre-dewatered and the piston 8 dewatering the pre-dewatered sludge located in chamber II, also pressure-controlled in batches via a valve 4 provided discharge opening 10 in the collecting container 24 from the chamber II.
  • the piston 8 reaches different end positions in the receiving chamber 25, since it runs up against the cone-shaped sludge deposits 22 forming the discharge openings 10, 11.
  • the raw sludge 21 supplied near the piston and on the side opposite to the direction of movement of the piston 8 dewaters on the filter surfaces made available to it and accumulates in layers behind the moving piston 8, which sludge the subsequent dewatering sludge in the other chamber pushes the layers closest to the discharge openings 10, 11 in batches, so that all sub-layers are dewatered approximately equally long.
  • the sludge is supplied via telescopic tubes 28, 29, which are guided centrally from both end faces of the receiving chamber 25 through the container lids 17, 18 and the discharge openings 10, 11 along their central axis are, wherein the tubes are each attached to a piston side and are provided with outflow openings 26, 27 for the raw sludge 21, which are preferably provided near the piston.
  • the outflow openings in the piston itself it is possible to arrange the outflow openings in the piston itself and to supply the raw sludge on one side, on both sides or even radially.
  • the outer wall of the cylindrical receiving chamber 25 in the bottom area or over the entire circumference is provided with a filter layer similar to the filter candles 12 with a filter layer surrounding it at a low height in order to subsequently enlarge the filter area and with the collecting containers 13, 14 in connection with the annular space for increased absorption of further filtrate 21.
  • the sides of the piston 8 facing the chambers I, II are equipped with further sieve-like filter surfaces to further enlarge the filter area and the process efficiency, with at least 8 in the piston a drain for the filtrate is provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Sludge (AREA)
  • Processing Of Solid Wastes (AREA)

Claims (8)

  1. Procédé destiné à retirer du liquide d'une masse qui est acheminée, au moyen d'une pompe (5), vers une chambre de réception (25) d'une presse, à proximité d'un piston (8) librement mobile et à double action, le piston (8) étant monté sur la face intérieure de la chambre de réception (25), divisant la chambre de réception en deux chambres de travail (I, II) et étant entraîné par la masse poussée sous pression dans la chambre de réception (25), et la masse libérée d'une partie du liquide étant repoussée lorsque le piston se déplace d'une position terminale dans la deuxième position terminale, caractérisé en ce que, dans une étape préliminaire du procédé, les boues brutes (21) mélangées à des floculants par une pompe (5), sont pompées, par une pompe à boues (6), à travers une vanne (1) et une amenée de boues (7), dans la chambre (I), à proximité du côté du piston (8) qui est orienté vers la chambre (I), boues brutes qui, alors, poussent le piston (8) jusqu'à une butée mécanique en direction de la chambre (II), réduisant ainsi continuellement son volume, à la suite de quoi les boues brutes sont prédéshydratées, la pression de la pompe s'élevant jusqu'à une pression de service, grâce à la présence de filtres en forme de chandelles (12) s'étendant dans le sens longitudinal de la chambre de réception et à travers des canaux traversants du piston (8), et répartis sur toute la section transversale, et grâce à la présence de collecteurs (13, 14) disposés de part et d'autre dans des couvercles (17, 18) et pourvus d'évacuations (15, 16).
  2. Procédé selon la revendication 1, caractérisé en ce que, pour passer de l'étape préliminaire au procédé, tout en conservant la pression de la pompe (6), la vanne (2) est ouverte et la vanne (1) est fermée, de telle sorte des boues brutes (21) fraîches sont pompées dans la chambre (2), par une amenée de boues (9) située à proximité du côté du piston (8) orienté en direction de la chambre (II), dont le volume augmente par déplacement du piston (8), boues brutes qui repoussent les boues prédéshydratées, se trouvant encore sous pression dans la chambre (I), à travers une ouverture de déversement (10) pourvue d'une vanne (3), jusqu'à ce que la pression régnant du côté du refoulement soit retombée à un niveau prédéterminable, à la suite de quoi la vanne reste fermée jusqu'à ce que le piston (8) déplacé ait fait remonter la pression régnant dans la chambre (I) à une pression maximale prédéterminable, qui est inférieure ou tout au plus égale à la pression de service, à la suite de quoi la vanne (3) est à nouveau ouverte, ce fonctionnement cyclique se poursuivant jusqu'à ce que le piston (8) atteigne une position terminale, qu'après un renversement des vannes (1) et (2), vanne (1) ouverte et vanne (2) fermée, le processus se poursuive en continu de façon similaire et dans le sens contraire et que des boues brutes (11) fraîches soient pompées, par la conduite de boues (7), à proximité du côté du piston (8) orienté en direction de la chambre (I), et que les boues déjà prédéshydratées soient évacuées par paquets hors de la chambre (II), à travers l'ouverture de déversement (10) pourvue d'une vanne (4), pour arriver dans le collecteur (24), en étant ainsi redéshydratées et réglées en pression.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la pompe à boues (6) fonctionne régulièrement avec une pression de service constante située entre 14 et 16 bar.
  4. Procédé selon l'une ou plusieurs des revendications précédentes, caractérisé en ce qu'il est possible de disposer de différentes positions terminales du piston (8), en fonction des caractéristiques des galettes de boues et du degré de déshydratation, étant donné que les boues se déposent autour des ouvertures de déversement (10, 11) à la manière d'un cône de déjection, que le piston (8) bute contre ce cône de déjection (22), ou lorsqu'il n'y en a pas, contre les couvercles du récipient (17, 18) et qu'il atteint une position terminale juste au moment où, du côté du refoulement, du fait de l'absence d'un reste de course de compression, il ne peut plus produire la pression minimum pour ouvrir la vanne de déversement (3, 4).
  5. Procédé selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que les boues brutes (21), pressées dans une chambre (I, II) à proximité du piston, sont prédéshydratées sur la surface de filtrage propre qui leur est destinée et se déposent, en couches et sous forme de galettes filtrées, derrière le piston (8) déplacé, et la galette filtrée redéshydratée se trouvant dans l'autre chambre (II, I) est repoussée par paquets de telle sorte qu'une couche de la galette de boues, se trouvant le plus à proximité de l'ouverture de déversement, arrive dans les collecteurs (23, 24) prévus à cet effet, de telle sorte que toutes les couches de la galette filtrée sont prédéshydratées et redéshydratées à peu près aussi longtemps dans la chambre de filtrage.
  6. Procédé selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que les boues brutes (21) sont acheminées à travers des tubes téléscopiques (28, 29) qui sont montés, à partir des deux faces frontales de la chambre de réception (20), traversent en leur milieu les deux couvercles (17, 18) du récipient et les ouvertures de déversement (10, 11), dans le sens de l'axe médian de la chambre de réception (25) et sont respectivement fixés sur un côté du piston, les boues brutes (21) sortant de préférence par des ouvertures d'évacuation (26, 27) prévues à proximité du piston.
  7. Procédé selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que les ouvertures d'évacuation (26, 27) peuvent également être situées à l'intérieur du piston lui-même et en ce que les boues brutes (21) peuvent être acheminées par un côté, par deux côtés ou radialement.
  8. Procédé selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que la pression de service régnant dans les chambres (I, II) est captée respectivement par un capteur ou un appareil de mesure de pression disposé dans la zone du couvercle et est transmise à une unité de réglage électronique.
EP91115039A 1990-10-10 1991-09-06 Procédé pour la dèshydratation sous pression de boues aqueuses Expired - Lifetime EP0480176B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4032145A DE4032145C1 (fr) 1990-10-10 1990-10-10
DE4032145 1990-10-10

Publications (2)

Publication Number Publication Date
EP0480176A1 EP0480176A1 (fr) 1992-04-15
EP0480176B1 true EP0480176B1 (fr) 1994-08-17

Family

ID=6416009

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91115039A Expired - Lifetime EP0480176B1 (fr) 1990-10-10 1991-09-06 Procédé pour la dèshydratation sous pression de boues aqueuses

Country Status (5)

Country Link
EP (1) EP0480176B1 (fr)
AT (1) ATE110024T1 (fr)
DE (2) DE4032145C1 (fr)
DK (1) DK0480176T3 (fr)
ES (1) ES2057690T3 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4223503A1 (de) * 1992-07-17 1994-01-20 Mueller Umwelttechnik Verfahren und Vorrichtung zur Entsorgung von Öl oder sonstiges Fett enthaltenden Schlämmen
JPH0691397A (ja) * 1992-09-11 1994-04-05 Nagaoka:Kk 汚泥処理用加圧式脱水装置および汚泥処理方法
JP3359409B2 (ja) * 1994-01-12 2002-12-24 株式会社ナガオカ 汚泥処理用加圧式脱水装置および汚泥処理方法
ITRM980190A1 (it) * 1998-03-25 1998-06-25 Gioia Antonio La Essiccatore copattatore a gabbia
DE19947044B9 (de) * 1999-09-30 2007-09-13 Osram Opto Semiconductors Gmbh Oberflächenmontierbares optoelektronisches Bauelement mit Reflektor und Verfahren zur Herstellung desselben
DE102009008904A1 (de) * 2009-02-13 2010-09-02 Gosatec Gmbh Vorrichtung und Verfahren zur Flüssigkeitsseparation
AT508024B1 (de) * 2009-06-18 2010-10-15 Celtec Gmbh Vorrichtung zum abtrennen grober feststoffe
CN117398745A (zh) * 2023-07-18 2024-01-16 水利部交通运输部国家能源局南京水利科学研究院 基于扩大管内置抽滤装置的低浓度泥浆脱水装置及方法
CN119977274B (zh) * 2025-04-16 2025-07-11 浙江浙达水业有限公司 一种具有反冲洗防堵结构的污水处理用排泥设备

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE249275C (fr) *
DE198415C (fr) * 1905-12-26
DE263722C (fr) * 1912-04-06 1913-09-09 Roth Philipp
DE1035101B (de) * 1955-05-25 1958-07-31 Dr Hans Heymann Filterpresse
DE3641180A1 (de) * 1986-12-02 1988-06-16 Mueller Umwelttechnik Vorrichtung zur druckentwaesserung von waessrigen schlaemmen
DK158149C (da) * 1987-03-31 1990-08-27 Optimal Miljoeteknik Aps Apparat til afvanding af slam

Also Published As

Publication number Publication date
DK0480176T3 (da) 1994-12-05
EP0480176A1 (fr) 1992-04-15
DE4032145C1 (fr) 1992-01-16
DE59102559D1 (de) 1994-09-22
ATE110024T1 (de) 1994-09-15
ES2057690T3 (es) 1994-10-16

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