WO1995007125A1 - Procede de separation de substances minerales legeres contenues dans des eaux usees et separateur a cet effet - Google Patents

Procede de separation de substances minerales legeres contenues dans des eaux usees et separateur a cet effet Download PDF

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Publication number
WO1995007125A1
WO1995007125A1 PCT/EP1994/003029 EP9403029W WO9507125A1 WO 1995007125 A1 WO1995007125 A1 WO 1995007125A1 EP 9403029 W EP9403029 W EP 9403029W WO 9507125 A1 WO9507125 A1 WO 9507125A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
water
substances
valve
floating
Prior art date
Application number
PCT/EP1994/003029
Other languages
German (de)
English (en)
Inventor
Ulrich Bachon
Hans-Georg Loseries
Axel Middelhaufe
Original Assignee
Passavant-Werke Ag
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 Passavant-Werke Ag filed Critical Passavant-Werke Ag
Publication of WO1995007125A1 publication Critical patent/WO1995007125A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/08—Vortex chamber constructions
    • B04C5/103—Bodies or members, e.g. bulkheads, guides, in the vortex chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0208—Separation of non-miscible liquids by sedimentation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0208—Separation of non-miscible liquids by sedimentation
    • B01D17/0214—Separation of non-miscible liquids by sedimentation with removal of one of the phases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0217—Separation of non-miscible liquids by centrifugal force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/12—Auxiliary equipment particularly adapted for use with liquid-separating apparatus, e.g. control circuits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
    • B01D21/0054—Plates in form of a coil
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0087—Settling tanks provided with means for ensuring a special flow pattern, e.g. even inflow or outflow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0096—Safety mechanisms specially adapted for settling tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B01D21/04—Settling tanks with single outlets for the separated liquid with moving scrapers
    • B01D21/06—Settling tanks with single outlets for the separated liquid with moving scrapers with rotating scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2405—Feed mechanisms for settling tanks
    • B01D21/2411—Feed mechanisms for settling tanks having a tangential inlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2433—Discharge mechanisms for floating particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/245—Discharge mechanisms for the sediments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/26—Separation of sediment aided by centrifugal force or centripetal force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/30—Control equipment
    • B01D21/307—Passive control mechanisms without external energy, e.g. using a float
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/30—Control equipment
    • B01D21/34—Controlling the feed distribution; Controlling the liquid level ; Control of process parameters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
    • B03B5/32—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions using centrifugal force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/08—Vortex chamber constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2221/00—Applications of separation devices
    • B01D2221/04—Separation devices for treating liquids from earth drilling, mining

Definitions

  • the invention relates to a method for separating mineral light substances from waste water contaminated with these light substances, such as oil, gasoline, benzene, and to a separating container.
  • coalescence separators which use the principle of combining the drops to form aggregates capable of rising (DIN 1999, parts 4 to 6). With both types of separator, the problem of removing the floating light liquid is not satisfactorily solved.
  • the separators designed according to DIN 1999 part 1 to 3 have a storage space for the floating light liquid. When the storage limit is reached, a probe arranged in the storage layer reports that the separator must be disposed of. If the disposal is then refrained from, a float closure arranged in front of the pure water outlet ensures that the pure water outlet is closed before the light liquid floating on the permissible amount of storage can get into the outlet.
  • Another possibility are light liquid separators, which enable the floating light liquid to drain off automatically. These separators take advantage of the phenomenon that the light liquid stratifies above the water according to its density difference to water.
  • the corresponding separators contain a conical lid on the liquid level that absorbs the floating liquid. whose funnel tip contains the overflow for the light liquid (DE-C 29 51 205). The light liquid is collected and stored in a special container and can be removed later.
  • the object of achieving an improvement in the separation effect is achieved according to the invention in that the wastewater in the calming section is forced to rotate several times in a spiral flow that the the lower area and in the upper area of the calming section are directed into flowless zones of the calming section and are compressed there by a two-dimensional contraction to a drainage point and that the substances are then allowed to run off due to the difference in density to water.
  • This new process results in an excellent separation of the contaminants and a largely automatic removal of the previously water-free compressed substances.
  • the floating mineral light substances are preferably drawn off automatically via a raised overflow edge.
  • the overflow edge lies below the layer of light material which is layered on the resting water level due to the difference in density.
  • the overflow edge is set higher than the rise so that water cannot get into the light material overflow when the dividing line rises due to the maximum inflow.
  • Another advantageous possibility of preventing water from flowing out of the light material overflow is to control the light material discharge by means of a closure valve arranged in front of the overflow and actuated by a float. Its float is tared in such a way that it floats on water, but goes under in the light material. The float thus ensures that the
  • Light material overflow opens when a certain amount of light materials has accumulated.
  • the increase in the dividing line caused by high wastewater inflow can initially lead to the closing of the float valve so that neither light materials nor water can run off.
  • the valve seat is placed according to the invention so deeply below the overflow edge that the resulting hydrostatic force exerted on the valve plate from the float's residual buoyancy force and from the clean water side from below is less than the closing force counterforce exerted by the column of light materials on the valve disk from above.
  • a third option for controlling the light material discharge is a control valve in the light material outlet and sensors in the zone in front of the light material overflow.
  • the valve is controlled in such a way that the valve is opened in the presence of light substances and closed in the presence of water.
  • a separating basin or container for carrying out the separating process is characterized in particular in that a guide wall which is spiraled from the tangential waste water inlet into the upright cylindrical or polyhedral vessel to the central clean water outlet is provided for a more than simple circulation of the waste water. Also the reverse flow direction from the inside to the outside is conceivable.
  • the spiral guide wall e.g. can consist of an outer straight section, a middle three-quarter circle section and an inner radial section, only needs to reach up to this flow-free zone.
  • the floating light liquid preferably always extends into the funnel opening of the cone cover.
  • the separator is therefore preferably always operated without a clear surface.
  • This mode of operation is e.g. achieved in that the inlet and outlet pipes are inflated, i.e. the drain is much higher than the funnel tip. It is conceivable then to pull the overflow line for the light liquid through the pure water drain line so much that the light liquid continuously drains off automatically. However, this means that the light liquid to be separated always has the same density. Since this is rarely the case, it is proposed in an embodiment of the invention to provide the overflow for the floating light liquid with a closure member and one in the area of the floating light liquid
  • Arrange conductivity probe which is connected to the control of the closure member in such a way that it opens in the presence of light liquid and at Presence of water is closed. In this way, regardless of the density of the light liquid, it is always drawn off automatically, so that there is only a little light liquid in the separating container.
  • two conductivity probes of different heights can be provided in an embodiment of the invention, which are connected to the control of the closure member such that when the lower probe senses the presence of light liquid, the closure member opened and, when the upper probe senses the presence of water, the closure member is shut off again. In both cases, the hydrostatic pressure prevailing in the inlet and outlet lines can be used to draw off the light liquid. Additional pressure generation is then not necessary.
  • coalescence elements which extend transversely in the spiral flow path.
  • These coalescence elements which freely end at the top in the flowless zone, can be designed in a known manner as a bar or wire mesh, perforated plate, screen surface, random fiber mat or reticulated foam sheet. It is important about these elements that they refer to the
  • the separator tank has a bottom which is curved or funnel-shaped and in which the sediments collect during the spiral flow.
  • the drain opening for the sediments receives a closure element, and the hydrostatic pressure of the water columns can also be used to remove the sediments.
  • a circumferential broaching and thickening crusher can be provided in the cone bottom. Such crows are known in sewage treatment plants.
  • Fig. 1 shows a first embodiment in
  • Fig. 2 shows the embodiment of Fig. 1 in
  • Fig. 3 shows a second embodiment in
  • FIG. 4 shows the cross section to FIG. 3
  • 5 shows a third embodiment variant only in vertical section
  • Fig. 6 shows another embodiment.
  • the separator housing 1 shown in FIGS. 1 and 2 consists of a cylindrical or polyhedral middle part 2 and a conical cover 3 or bottom 4. At the cone tips there are extraction openings 5, 6 with closures 7, 8.
  • the waste water inlet 9 contains a tangential one the middle part circumference opens, slightly conically expanded inlet connection 10, to which a guide wall 11 connects in the interior of the separator housing 1.
  • the guide wall 11 consists of an outer surface section 11 ', a three-quarter circle central section 11' 'and an inner radial section 11' ''. This closes at the inner end of the radial section 11 '' ' '
  • both light and sinking materials have the opportunity to float or sediment and thus pass out of the flowless and the flowless zone.
  • the light substances 17 collect under the cone cover 3 and can be pulled off by opening the closure 7 and collected in a disposal container (not shown).
  • the two probes 14, 15 automate the removal in such a way that the lower probe 14 opens the closure 7 in the presence of light substances 17 and the upper probe 15 closes it again in the presence of water. With this control it is achieved that only a small amount of light materials collect in the separator and that the discharge takes place without water.
  • the sediments can be removed at regular intervals or when the need is ascertained through a sight glass.
  • the direction of flow through the separator housing 20 according to FIGS. 3 and 4 is from the inside to the outside.
  • the separator shown here differs from that shown in Fig. 1/2 in that only light materials can be separated. If the wastewater also contains sediment, a conventional sludge trap must be installed upstream of this separator.
  • the bottom 21 of the light material separator is flat and carries the guide wall 22, which is essentially a mirror image of FIGS. 1/2.
  • the inlet pipe 24 which dips through the conical cover 23 from above is half open in the section covering the guide wall 22.
  • the wastewater entering is thereby spread over the entire height of the guide wall 22 and slowed down accordingly. It initially flows along the radial section of the guide wall and is deflected at the end thereof into the circulation which ends in the weakly conical outlet connection 25.
  • the outlet 26 for the floating light substances is again arranged exactly at the tip of the conical cover 23.
  • the separator 20 shown in FIG. 5, on the other hand, is only suitable for separating suspended matter. He can e.g. 3 and 4 upstream of a light material separator and then ensures a complete separation of even difficult to separate sediments.
  • the peculiarity of this embodiment is that the conical base 31 consists of a flatter upper (31 ') and a steeper lower truncated cone 31' '.
  • a clearing mechanism 33 rotates, which is driven from above (geared motor 34).
  • a certain thickening effect is also achieved with this broaching device, which increases the solids content of the sludge.
  • the guide wall 35 has the course shown in Fig. 1/2. Because of the drive shaft 36 lying in the container axis, the pure water outlet 37 has moved somewhat out of the center.
  • FIG. 6 again shows a separation vessel 40 for separating light and sinking substances.
  • the cone cover 43 has a weaker inclination than the cone bottom.
  • the wastewater inlet 49 is here attached to the outside of the separating vessel and opens with a slot 50 tangentially on the circumference.
  • the baffle 45 is the continuation of the inner edge of the inlet slot.
  • a valve plate 42 connected to a float 41 is used to control the removal of the light materials 47, which lies against the valve seat 48 provided at the light material outlet 46 from below.
  • the upright stable floating position of the valve body is brought about by a weight 51 attached to the float.
  • a plurality of rods 52 which are arranged around the valve seat, serve for vertical guidance.
  • the float valve is closed when the separating vessel is filled with * water in accordance with the standards. If mineral light materials 47 are brought in with the waste water, they float to the top of the cone cover and form a growing layer of floating material there. When the layer of floating material has reached a certain thickness, the residual buoyancy of the swimmer decreases because he is increasingly surrounded by a medium with a lower density than water. If the inflow stops, then the dividing line 53 drops to water to the level specified by the pure water discharge level 54. This means that the float valve 41, 42 can sink and release the outlet 46 for the escape of the floating substances. As the floating substances run out, the dividing line rises again and closes the float valve again.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Physical Water Treatments (AREA)

Abstract

Avant d'entrer dans la canalisation, les eaux usées contaminées essentiellement par des liquides minéraux légers, sont acheminées à travers un séparateur répondant aux normes DIN, qui constitue une section de stabilisation où les liquides légers peuvent surnager du fait que leur densité diffère de celle de l'eau. Afin d'améliorer le degré de séparation et de faciliter l'extraction sans eau des substances séparées, les eaux usées sont acheminées, dans la section de stabilisation, dans un courant spiroïdal circulant à plusieurs reprises. Le liquide léger qui se sépare à cette occasion vers le haut, est dirigé dans une zone sans écoulement où il est comprimé par constriction bidimensionnelle pour former un point d'extraction d'où ledit liquide léger ainsi comprimé est extrait par moments grâce à la différence existant entre sa densité et celle de l'eau. L'extraction débute dès qu'un capteur détecte la présence d'une couche suffisante.
PCT/EP1994/003029 1993-09-09 1994-09-09 Procede de separation de substances minerales legeres contenues dans des eaux usees et separateur a cet effet WO1995007125A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4330552A DE4330552C2 (de) 1993-09-09 1993-09-09 Abscheider mit Beruhigungszone zum Abtrennen von mineralischen Leichtstoffen
DEP4330552.0 1993-09-09

Publications (1)

Publication Number Publication Date
WO1995007125A1 true WO1995007125A1 (fr) 1995-03-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1994/003029 WO1995007125A1 (fr) 1993-09-09 1994-09-09 Procede de separation de substances minerales legeres contenues dans des eaux usees et separateur a cet effet

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Country Link
DE (1) DE4330552C2 (fr)
WO (1) WO1995007125A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6358415B1 (en) 1998-11-24 2002-03-19 Wai On Leung Vortex sewage disposal apparatus

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Publication number Priority date Publication date Assignee Title
WO1996036413A1 (fr) * 1995-05-17 1996-11-21 Gregova Zuzana Procede et appareil de traitement de fluides
DE29704838U1 (de) * 1997-03-17 1998-07-23 Passavant Werke Bausatz für den Zusammenbau von Abscheidern für Leicht- und/oder Sinkstoffe
DE29710763U1 (de) * 1997-06-20 1998-11-19 Benkeser Michael Flüssigkeitsabscheider
DE29711083U1 (de) * 1997-06-25 1998-10-22 Benkeser Michael Flüssigkeitsabscheider
DE19729802C2 (de) * 1997-07-11 2000-06-08 Frankenberger Dieter Verfahren und Vorrichtung zum Trennen von Stoffen und Verwendung einer Leiteinrichtung
EP0960643B1 (fr) * 1998-05-18 2005-07-20 Awas Ag Appareil de séparation d'un mélange de liquides à deux phases en liquide léger et en liquide lourd
DE102007019000A1 (de) * 2007-04-21 2008-10-23 Zf Friedrichshafen Ag Koaleszenzabscheider zum Trennen von Öl-Wassergemischen
CN107675772B (zh) * 2017-11-03 2019-11-19 浙江海洋大学 一种冲洗油罐区泥沙的自动排水系统
IT202000029249A1 (it) * 2020-12-01 2021-03-01 Energy Supply Chain Plan S R L Separatore a spirale in campo di forze gravitazionale, elettrico e magnetico per miscele di fluidi, gassosi e liquidi

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DE1052951B (de) * 1956-05-05 1959-03-19 Siemens Ag Vorrichtung zum Entmischen von OEl-Wasser-Gemischen
WO1989007971A1 (fr) * 1988-03-02 1989-09-08 Hill Venning John Separateurs
EP0495386A1 (fr) * 1991-01-14 1992-07-22 Passavant-Werke Ag Procédé pour la séparation des matériaux flottants et sédimentants à partir d'eaux usées
EP0505734A2 (fr) * 1991-02-22 1992-09-30 Passavant-Werke Ag Séparateur pour l'épuration d'eaux usées contaminées par des matières flottantes et sédimentaires
WO1993007946A1 (fr) * 1991-10-18 1993-04-29 William Warwick Foster Separateurs

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DE241369C (de) * 1910-08-05 1911-11-30 Abwasserreinigungsapparat, bestehend aus einem zylindrischen teil, welcher zwei kegelförmige teile verbindet, die mit den spitzen einander abgekehrt sind
US4780201A (en) * 1987-12-14 1988-10-25 Keeter Kathy L Apparatus and process to separate and remove extraneous matter from a liquid stream
DE3807643A1 (de) * 1988-03-09 1989-09-21 Passavant Werke Leichtfluessigkeitsabscheider
US5147534A (en) * 1990-07-31 1992-09-15 Rymal Jr Theodore R Waste water treatment system
DE4100882A1 (de) * 1991-01-14 1992-07-16 Winkhaus Fa August Stellantrieb fuer einen fenster- oder tuerbeschlag

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Publication number Priority date Publication date Assignee Title
DE1052951B (de) * 1956-05-05 1959-03-19 Siemens Ag Vorrichtung zum Entmischen von OEl-Wasser-Gemischen
WO1989007971A1 (fr) * 1988-03-02 1989-09-08 Hill Venning John Separateurs
EP0495386A1 (fr) * 1991-01-14 1992-07-22 Passavant-Werke Ag Procédé pour la séparation des matériaux flottants et sédimentants à partir d'eaux usées
EP0505734A2 (fr) * 1991-02-22 1992-09-30 Passavant-Werke Ag Séparateur pour l'épuration d'eaux usées contaminées par des matières flottantes et sédimentaires
WO1993007946A1 (fr) * 1991-10-18 1993-04-29 William Warwick Foster Separateurs

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Title
PATENT ABSTRACTS OF JAPAN *

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US6358415B1 (en) 1998-11-24 2002-03-19 Wai On Leung Vortex sewage disposal apparatus

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Publication number Publication date
DE4330552C2 (de) 1997-06-12
DE4330552A1 (de) 1995-03-16

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