WO2006111420A1 - Dispositif et procede de separation de matieres solides et de liquides - Google Patents

Dispositif et procede de separation de matieres solides et de liquides Download PDF

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Publication number
WO2006111420A1
WO2006111420A1 PCT/EP2006/003743 EP2006003743W WO2006111420A1 WO 2006111420 A1 WO2006111420 A1 WO 2006111420A1 EP 2006003743 W EP2006003743 W EP 2006003743W WO 2006111420 A1 WO2006111420 A1 WO 2006111420A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
candle
liquid
filters
gas
Prior art date
Application number
PCT/EP2006/003743
Other languages
German (de)
English (en)
Inventor
Antonio Giangrasso
Andreas Skupin
Original Assignee
Pfleiderer Water Systems Gmbh
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 Pfleiderer Water Systems Gmbh filed Critical Pfleiderer Water Systems Gmbh
Priority to EP06742653A priority Critical patent/EP1877155A1/fr
Publication of WO2006111420A1 publication Critical patent/WO2006111420A1/fr

Links

Classifications

    • 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
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter 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
    • B01D29/50—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
    • 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
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6438—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles
    • 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
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/04—Supports for the filtering elements
    • B01D2201/0469—Filter tubes connected to collector tubes
    • B01D2201/0476—Filter tubes connected to collector tubes mounted substantially vertically on collector tubes at the lower side of the filter elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/08—Regeneration of the filter
    • B01D2201/087—Regeneration of the filter using gas bubbles, e.g. air

Definitions

  • the present invention relates to apparatus and methods for separating solids from liquids, especially for use as the final stage of water treatment in sewage treatment plants.
  • sand filters are often used as the final stage of water treatment. These filters usually consist of a sand-filled concrete basin, through which the water is carried. Sand filters have the disadvantage of relatively slow filtration. Moreover, sand filters have a very high floor space requirement in terms of throughput. Sand filters are described, for example, in Chapter 8.4 of St dirty, "Mechanical Process Engineering 2", Springer Verlag, 1st edition 1994.
  • sand filters are the plate filters. These filters are characterized by a water basin in which a plurality of plate-shaped filters are attached to a horizontal axis. The plate-shaped filters rotate along the horizontal axis in the water, so as to achieve a falling of the accumulating on the surface of the filter plates filter cake. This measure increases the service life of the filter, ie the period of time until the same by adhering Filter cake is clogged to such an extent that it must be cleaned by establishing a counter flow of water.
  • plate filters have the disadvantage that the rotation requires an increased expenditure on equipment, as well as an increased energy consumption.
  • the object of the invention is therefore to provide devices and methods for the separation of solids from liquids, which allow to achieve a large liquid flow rate on a small floor area, and which have no moving parts and therefore awarded by a low expenditure on equipment and low energy consumption are.
  • FIG. 1a schematically illustrates the structure of a filter unit containing a filter module with three candle filters and a gas supply device.
  • FIG. 1 b schematically illustrates the filter module shown in FIG. 1 a in plan view.
  • FIG. 2 shows schematically the flow of water treatment in a sewage treatment plant. Detailed description of the invention
  • the term “candle filter” refers to all filter elements which have at least one porous surface suitable for filtration, which are designed such that an internal volume is separated from the external environment by the candle filter such that both volumes are only through the pores in the area suitable for filtration.
  • the internal volume is separated from the environment only by the area suitable for filtration.
  • the area suitable for filtration is an elongated shape with a circular cross-section.
  • other cross sections such as e.g. oval or square cross sections.
  • the area suitable for filtration be substantially vertical. This has the advantage that gas bubbles can smoothly sweep the surface as they rise through the solids-containing liquid.
  • other shapes are also suitable, such as, for example, conical filter candles which have a larger diameter in the upper region than in the lower region.
  • the candle filter is arranged substantially vertically. This in turn has the advantage that the gas bubbles can rise undisturbed along the surface of the candle filter and not move away from it. Smaller inclinations of less than 15 °, preferably less than 10 °, to the vertical are however acceptable.
  • the candle filter should be a surface filter.
  • Surface filters are characterized in that the particles to be separated do not penetrate into the interior of the filter, but deposit on its surface. Such surface filters are described, for example, in chapter 7.3.2 by St playful, "Mechanical Process Engineering 2", Springer Verlag, 1st edition 1994 described.
  • the material of the candle filter is not specified, provided that the filter is inert in the liquid to be filtered.
  • Preferred for use in sewage treatment plants are plastic materials as described in DE 102 18 073. This concerns in particular the pore size distribution, starting materials and
  • the mean pore size on the outside of the candle filter should preferably be 3 to 5 times or less the average particle size of the particles in the liquid to be filtered.
  • the size of the candle filter is not fixed.
  • the task of the gas delivery device is to generate a constant flow of gas bubbles which sweeps along the outer surfaces of the candle filters.
  • the gas supply device is connected to a gas supply line.
  • this is a supply of air.
  • the gas supply device is hollow inside and comprises one or more openings through which the gas into the liquid flows.
  • the gas supply device is equipped with a plurality of openings.
  • each cartridge filter is assigned a separate gas supply device. In the most preferred variant these are separate
  • Gas supply devices formed along the respective outer surfaces of the candle filter.
  • the gas supply devices are preferably designed and arranged in a ring shape with a small spacing around the respective outer surfaces of the candle filters (or below the same). These rings are preferably provided at regular intervals with openings. This allows a uniform and effective supply of gas bubbles to the outer surfaces of the candle filter.
  • the material of the gas supply device is not specified if it is inert to the gas and to the liquid to be filtered.
  • Preferred materials are polyethylene, polypropylene, polyvinyl chloride and stainless steel.
  • the filter module according to the invention comprises one or more of the candle filters described above, and one or more gas supply devices, as explained above, on.
  • the filter module according to the invention has at least three, more preferably three to ten cartridge filters.
  • the relative arrangement of the candle filter to each other is not specified.
  • the candle filters are arranged parallel to each other vertically.
  • the candle filters can be arranged annularly (in plan view).
  • suitable is an arrangement in rows or at regular intervals in a raster grid.
  • Other arrangements are also possible, but on the one hand on the best possible soil or space utilization should be sought.
  • the design requirements with regard to suitable and cost-effective liquid discharges (as well as gas feeds) should be taken into account.
  • An attachment of the candle filter is provided via the liquid lines. If necessary, the cartridge filters can be connected to each other in the upper area to prevent vibrations. This is particularly advantageous for long candle filters.
  • a connection of the candle filter with the liquid line is possible via suitable screw or plug connections.
  • filter modules with multiple candle filters and advantageous to connect them with each other via a loop.
  • This loop may in turn be equipped with suitable connections for connection to the liquid drainage.
  • each filter module it is conceivable to equip each filter module with a single gas supply device, even if the filter module has more than one candle filter.
  • each cartridge filter is assigned its own gas supply device.
  • the gas supply device is arranged in the region of the foot of the relevant candle filter, ideally the gas outlet openings are arranged annularly around the outer surface of the foot of the candle filter, so that a uniform supply of gas bubbles to the entire surface of the candle filter can be ensured ,
  • other arrangements are also possible as far as the function of the escaping gas bubbles (ie the detachment of adhering filter cake by local convection) is ensured to a substantially considerable extent.
  • the purpose of the gas delivery device is to release a stream of gas bubbles which sweeps along the outer surface of the candle filter (s) so as to cause local convection of the liquid near the filter surface, causing the surface cake to fall or peel off should at least facilitate.
  • the gas supply device may be attached either to the candle filters, to the liquid lines or to the gas supply lines. This is not specified.
  • An alternative variant is characterized by an attachment of the gas supply devices to the above-mentioned ring lines.
  • a connection of the gas supply with the gas or the gas lines is possible via all common screw, plug or other types of connections that are used for the connection of gas lines.
  • the filter unit according to the invention represents the complete and functional unit.
  • This unit comprises at least one filter module.
  • two or more filter modules are preferred, which in turn may be clustered. This may be advantageous, for example, since such a modular design with clustered filter modules allows the cleaning or regeneration of individual modules during operation by countercurrent, without the operation of the other filter modules would have to be interrupted.
  • the number of filter modules present in the filter unit depends on the need for filter capacity. Under the From the point of view of favorable soil or space use, it is advantageous if the filter modules are arranged at regular intervals, which are chosen as narrow as possible, without the individual filter modules interfere with each other during operation and so that maintenance of the individual filter modules is guaranteed ,
  • the container has the task to record the liquid to be filtered as well as the or the filter modules. Consequently, the container must be inert and dense to the liquid to be filtered. He is of course equipped with a liquid inlet, and an outlet for filter sludge. Furthermore, the liquid and gas line (s) are provided, which in turn can also be guided through suitable openings in the wall of the container.
  • the container is dimensioned so that the liquid level can be well above the upper ends of the candle filter.
  • a hydrostatic pressure so-called "water column”
  • Preference is given to a liquid level of 1 m to 5 m above the upper ends of the candle filters.
  • Such a construction allows filtration solely by the hydrostatic pressure, which is built up by the gravity of the liquid to be filtered.
  • the use of pumps and in particular of suction pumps is therefore not required. Therefore, preferred embodiments of the present invention are characterized by the absence of pumps of any kind, and particularly suction pumps. The process according to the invention for the separation of solids is described below.
  • the method according to the invention is not restricted to a specific field of application, and it can be used for any liquid containing any solid particles.
  • a preferred field of application is the use for the filtration of water as a final stage in the treatment of water by treatment plants, ie after the secondary treatment (25) in Figure 2.
  • the inventive method is particularly advantageous if a filtration at low pressures and with low power consumption is desired.
  • water When used as the last filtration stage in sewage treatment plants, of course, water is the liquid to be filtered and it is separated as solids in particular sewage sludge in low concentration and sand.
  • the method of the invention is not limited to use with this liquid and these solids. Rather, the inventive method for any liquids and any solids can be used. In this case, it is only necessary to select suitable inert materials for the constituents of the filter unit according to the invention, and to adapt the average pore width of the surface filter to the average solid particle size.
  • a gas offers due to the low cost and general availability in particular air.
  • other gases may also be beneficial under certain conditions.
  • the use of nitrogen gas lends itself to when the liquid to be filtered or the solids contained therein are sensitive to oxygen.
  • a liquid flow rate of 1 m ⁇ / h to 40 m ⁇ / h can be achieved, preferably a gas amount of 0.5 to 10 m ⁇ / h is released from the gas supply devices.
  • the liquid flow rate can be controlled by specifying the filling level of the container, it should be noted that with increasing degree of clogging of the filter modules, the liquid flow rate decreases. When the liquid flow rate falls below a predetermined limit, it is desirable to reverse the flow of liquid briefly so as to blast off the adhered filter cake from the outer surface of the candle filter. For this purpose, a suitable connected to the liquid lines pump is advantageous.
  • FIG. 1a shows a filter unit according to the invention in a side view.
  • the liquid passes into the container (3), in which a filter module (4) is located.
  • the liquid level is indicated by reference numeral (5).
  • the filter module (4) with (in this case) three candle filters (6).
  • the liquid penetrates through the surface filters of the candle filter and is guided in its interior via a ring line (7) and a liquid line (8) from the filter unit.
  • the liquid line (8) is connected to a pump (9) which allows the candle filters to be regenerated by backwashing.
  • the pump is followed by a drain (10).
  • a further opening (11) is provided which can be used as sludge discharge. Not shown, but practically useful, it is inclined to the bottom of the container for mud discharge form, as this significantly facilitates the sludge discharge.
  • a gas line (12) provides the gas supply device (13) with the required gas.
  • FIG. 1 b shows the filter unit (1) in a plan view.
  • the inlet (2) can be seen on the left, in the center of the barrel-shaped container (3) a filter module (4) is arranged, the three candle filters (6), a ring line (7 ), and a gas supply device (13). Finally, a liquid line (8) can be seen on the right side.
  • FIG. 2 schematically illustrates the sequence of the individual purification stages in a conventional sewage treatment plant.
  • the wastewater is transported via a screw lifting installation (20) to a mechanical pretreatment stage, which includes, inter alia, screening (21) of the wastewater to be clarified.
  • a mechanical pretreatment stage which includes, inter alia, screening (21) of the wastewater to be clarified.
  • the biological treatment of the waste water follows, which comprises the step of denitrification (23) as well as the step of nitrification (24).
  • sludge is separated from the clarified water and fed to the wastewater at the beginning of the biological treatment.
  • the clarified water can now be introduced in principle into a river or the sea.
  • Reference numerals (28) and (29) represent the recycling of mud and water.
  • Reference numeral (30) refers to a stirring device.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)

Abstract

Dispositifs et procédés de séparation de matières solides présentes dans des liquides, destinés à être utilisés en particulier lors de la dernière phase du traitement de l'eau dans des stations d'épuration. Les dispositifs et procédés selon la présente invention se caractérisent en particulier par l'utilisation de filtres cartouches conçus sous forme de filtres de surface, dont la surface est parcourue lors du fonctionnement par des bulles de gaz. La présente invention a pour avantage de permettre un gros débit de liquide sur une surface au sol minime, et d'éviter le recours à des parties mobiles, ce qui entraîne un faible besoin en appareils et un faible besoin en énergie.
PCT/EP2006/003743 2005-04-22 2006-04-24 Dispositif et procede de separation de matieres solides et de liquides WO2006111420A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06742653A EP1877155A1 (fr) 2005-04-22 2006-04-24 Dispositif et procede de separation de matieres solides et de liquides

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005018886A DE102005018886A1 (de) 2005-04-22 2005-04-22 Vorrichtung und Verfahren zur Trennung von Feststoffen und Flüssigkeiten
DE102005018886.9 2005-04-22

Publications (1)

Publication Number Publication Date
WO2006111420A1 true WO2006111420A1 (fr) 2006-10-26

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Application Number Title Priority Date Filing Date
PCT/EP2006/003743 WO2006111420A1 (fr) 2005-04-22 2006-04-24 Dispositif et procede de separation de matieres solides et de liquides

Country Status (3)

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EP (1) EP1877155A1 (fr)
DE (1) DE102005018886A1 (fr)
WO (1) WO2006111420A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106139692A (zh) * 2016-09-21 2016-11-23 重庆方盛净化设备有限公司 设有残油过滤的污油振动过滤装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9782703B2 (en) 2011-09-30 2017-10-10 Basf Se Device for separating a heterogeneous mixture of matter and method for cleaning a filter unit
ES2720854T3 (es) 2011-09-30 2019-07-25 Basf Se Dispositivo para separar una mezcla heterogénea de sustancias, así como procedimiento para limpiar una unidad de filtrado

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994000217A1 (fr) * 1992-06-19 1994-01-06 Shurdov, Mikhail Arkadievich Filtre de separation de suspension
EP1346758A2 (fr) * 2002-03-21 2003-09-24 O. Malmkvist AB Dispositif de filtration
WO2004018084A1 (fr) * 2002-08-21 2004-03-04 U.S. Filter Wastewater Group, Inc. Procede d'aeration
FR2857883A1 (fr) * 2003-07-23 2005-01-28 Cie Ind De Filtration Et D Equ Procede pour la filtration de l'eau a l'aide d'un filtre a diatomite et installation pour la mise en oeuvre dudit procede

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9914854D0 (en) * 1999-06-25 1999-08-25 Wilkes Ian P Self cleaning membrane device for filtration used in submerged operation
DE10002397C2 (de) * 2000-01-20 2003-03-27 Wolfgang Josef Bierduempfl Absetzfilter
DE10218073A1 (de) * 2002-04-23 2003-11-20 Pfleiderer Infrastrukturt Gmbh Belüfter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994000217A1 (fr) * 1992-06-19 1994-01-06 Shurdov, Mikhail Arkadievich Filtre de separation de suspension
EP1346758A2 (fr) * 2002-03-21 2003-09-24 O. Malmkvist AB Dispositif de filtration
WO2004018084A1 (fr) * 2002-08-21 2004-03-04 U.S. Filter Wastewater Group, Inc. Procede d'aeration
FR2857883A1 (fr) * 2003-07-23 2005-01-28 Cie Ind De Filtration Et D Equ Procede pour la filtration de l'eau a l'aide d'un filtre a diatomite et installation pour la mise en oeuvre dudit procede

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106139692A (zh) * 2016-09-21 2016-11-23 重庆方盛净化设备有限公司 设有残油过滤的污油振动过滤装置

Also Published As

Publication number Publication date
DE102005018886A1 (de) 2006-11-02
EP1877155A1 (fr) 2008-01-16

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