EP0560025B1 - Process for cleaning dishes in multiple stage washing machines - Google Patents

Process for cleaning dishes in multiple stage washing machines Download PDF

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Publication number
EP0560025B1
EP0560025B1 EP93100973A EP93100973A EP0560025B1 EP 0560025 B1 EP0560025 B1 EP 0560025B1 EP 93100973 A EP93100973 A EP 93100973A EP 93100973 A EP93100973 A EP 93100973A EP 0560025 B1 EP0560025 B1 EP 0560025B1
Authority
EP
European Patent Office
Prior art keywords
stage
procedure according
waste water
prewash
gravity separation
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
EP93100973A
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German (de)
French (fr)
Other versions
EP0560025A1 (en
Inventor
Ulrich Dipl.-Ing. Bachon
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.)
Aqseptence Group GmbH
Original Assignee
Passavant Werke AG and Co KG
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Filing date
Publication date
Application filed by Passavant Werke AG and Co KG filed Critical Passavant Werke AG and Co KG
Publication of EP0560025A1 publication Critical patent/EP0560025A1/en
Application granted granted Critical
Publication of EP0560025B1 publication Critical patent/EP0560025B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0002—Washing processes, i.e. machine working principles characterised by phases or operational steps
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/24—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4202—Water filter means or strainers
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4219—Water recirculation
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2601/00—Washing methods characterised by the use of a particular treatment
    • A47L2601/02—Pressurised cleaning liquid delivered by a pump

Definitions

  • the invention relates to a new method for cleaning dishes in the known multi-stage washing systems.
  • These dishwashers contain at least one pre-wash stage ("pre-clearing zone”), a main wash stage and a final rinse stage.
  • the rinse water is circulated in the individual rinse stages by means of pumps. Fresh water mixed with rinse aid is used in the rinse aid stage.
  • the fresh water which is reduced by the carry-away losses of the dishes, passes through the washing system in countercurrent to the transportation of the dishes. It is collected under the pre-rinse stage and freed of contaminants that influence the discharge conditions mechanically (light liquid separator with sludge trap) or physico-chemically (emulsion splitting system).
  • the wastewater treatment system is usually installed far away from the flushing system and is therefore often neglected. If the disposal intervals are much too long, the waste that is then disposed of can only be disposed of as special waste because it has decomposed into non-recyclable substances through acidic fermentation.
  • the task of shortening the disposal intervals is achieved in another known dishwasher system (CH-A-262228) in that the wastewater obtained in the pre-rinse stage is mechanically cleaned in an integrated cleaning system designed as a filter and then fed back to the pre-rinse stage as rinse water .
  • the arrangement of the rinsing water cleaning system in the dishwasher opens up the possibility of disposing of the separated wastewater ingredients in a fresh and thus recyclable state at short intervals.
  • the mechanical cleaning system designed as a filter cannot be handled in a practical manner.
  • the filters clog quickly and therefore have to be removed very frequently for cleaning. This cleaning is unsanitary and is therefore often neglected or postponed for an unacceptably long time.
  • liquid edible fats and oils are not retained by the filter and enter the sewage system with the filtrate.
  • the object of avoiding these disadvantages and malfunctions of this known cleaning system is, based on a mechanical wastewater treatment stage integrated in the dishwasher, achieved according to the invention in that the mechanical wastewater treatment stage is designed as a gravity separation stage.
  • Separators of this type are known as cleaning devices for waste water contaminated with light substances.
  • their use as an integrated cleaning stage for the waste water occurring in the pre-rinsing stage of a dishwasher, which may contain sinking and floating substances is not known.
  • the use of such an integrated cleaning stage has the advantages that all of the ingredients contained in the waste water are now retained and there is a hygienic removal option. Since the separation stage is located inside the dishwasher, the ingredients (which are considered to be valuable) are disposed of regularly. The collected ingredients can now be brought fresh for reprocessing.
  • a gravity separator that works without air access is preferably used. If, according to the invention, the ingredients separated off there are transferred to collection containers which also do not contain any air volume, the ingredients can be brought to recycling in the fresh state.
  • the wastewater is also chemically cleaned, e.g. B. the ingredients present in emulsified form are separated, then this purified water can be reused in the rinse zone and can thus be recycled. This drastically reduces fresh water consumption.
  • the wastewater cleaned in this way also fulfills the discharge conditions and can be discharged into the sewage system.
  • the solid contaminants are usually retained by a coarse sieve. This sieve must be cleaned at regular intervals.
  • the screened solid contaminants in a s. G. To shred wet shredder and to transport it to press dewatering with the unpurified wastewater taken from the pre-rinse stage.
  • the press water from press dewatering is cleaned in the plant's own cleaning system and then recycled to the pre-rinse stage.
  • the wet shredder can even be used for solid contaminants that occur in other areas of the kitchen or canteen, which are thus also fed into a controlled recycling process.
  • the press-dewatered contaminants are stacked in the collection container until they are disposed of.
  • Waste water with separable contents occurring at other points can also be treated in the separator system of the dishwasher and the cleaned waste water can also be used in the dishwasher system. This results in a second use of these waters.
  • the collecting container can finally used cooking oils and fats, such as. B. fryer fat, are supplied so that their disposal and return is secured for recycling.

Landscapes

  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Physical Water Treatments (AREA)
  • Washing And Drying Of Tableware (AREA)

Abstract

Even in dish-washing appliances in the industrial sector, water is to be saved in the individual washing stages by recirculation. The clear water passes through the washing stages counter to the transporting direction of the dishes. The waste water of the pre-rinsing stage can be recycled in this stage after mechanical filtration. If it is also treated chemically, it can be reused in the clear rinsing stage. The separated substances occurring during filtration are collected with exclusion of air and disposed of at brief intervals.

Description

Die Erfindung bezieht sich auf ein neues Verfahren zum Reinigen von Geschirr in den bekannten mehrstufigen Spülanlagen. Diese Geschirrspülanlagen enthalten mindestens eine Vorspülstufe ("Vorabräumzone"), eine Hauptspülstufe und eine abschließende Klarspülstufe.The invention relates to a new method for cleaning dishes in the known multi-stage washing systems. These dishwashers contain at least one pre-wash stage ("pre-clearing zone"), a main wash stage and a final rinse stage.

Das Spülwasser wird mittels Pumpen in den einzelnen Spülstufen umgewälzt. In der Klarspülstufe wird mit Klarspülmittel versetztes Frischwasser eingesetzt. Das um Ausschleppverluste des Geschirrs verringerte Frischwasser durchläuft die Spülanlage im Gegenstrom zur Transporteinrichtung des Geschirrs. Es wird unter der Vorspülstufe aufgefangen und in der vorgeschriebenen Weise mechanisch (Leichtflüssigkeitsabscheider mit Schlammfang) oder physiko-chemisch (Emulsionsspaltanlage) von, die Einleitbedingungen beeinflussenden, Schmutzstoffen befreit.The rinse water is circulated in the individual rinse stages by means of pumps. Fresh water mixed with rinse aid is used in the rinse aid stage. The fresh water, which is reduced by the carry-away losses of the dishes, passes through the washing system in countercurrent to the transportation of the dishes. It is collected under the pre-rinse stage and freed of contaminants that influence the discharge conditions mechanically (light liquid separator with sludge trap) or physico-chemically (emulsion splitting system).

Die Abwasserbehandlungsanlage ist in der Regel örtlich weit weg von der Spülanlage installiert und wird demnach häufig vemachlässigt. Bei den viel zu langen Entsorgungsintervallen ist der dann entsorgte Abfall nur noch als Sonderabfall zu beseitigen, weil er sich durch saure Gärung in nicht wiederverwertbare Stoffe zersetzt hat.The wastewater treatment system is usually installed far away from the flushing system and is therefore often neglected. If the disposal intervals are much too long, the waste that is then disposed of can only be disposed of as special waste because it has decomposed into non-recyclable substances through acidic fermentation.

Die Aufgabe, die Entsorgungsintervalle zu verkürzen, ist bei einer anderen bekannten Geschirrspülanlage (CH-A-262228) dadurch gelöst, daß das in der Vorspülstufe anfallende Abwasser in einer als Filter ausgebildeten, integrierten Reinigungsanlage mechanisch gereinigt und danach der Vorspülstufe als Spülwasser wieder zugeführt wird. Die Anordnung der Spülwasserreinigungsanlage in der Geschirrspülmaschine eröffnet zwar die Möglichkeit, die abgetrennten Abwasser-Inhaltsstoffe in kurzen Zeitabständen in frischem und damit wiederverwertbarem Zustand zu entsorgen.The task of shortening the disposal intervals is achieved in another known dishwasher system (CH-A-262228) in that the wastewater obtained in the pre-rinse stage is mechanically cleaned in an integrated cleaning system designed as a filter and then fed back to the pre-rinse stage as rinse water . The arrangement of the rinsing water cleaning system in the dishwasher opens up the possibility of disposing of the separated wastewater ingredients in a fresh and thus recyclable state at short intervals.

Die als Filter ausgebildete mechanische Reinigungsanlage ist nicht praxisgerecht handhabbar. Die Filter setzen sich schnell zu und müssen deshalb zur Reinigung sehr häufig entnommen werden. Diese Reinigung ist unhygienisch und wird deshalb oft unterlassen oder unzulässig lange aufgeschoben. Außerdem werden flüssige Speisefette und -öle von dem Filter nicht zurückgehalten und gelangen mit dem Filtrat in die Kanalisation.The mechanical cleaning system designed as a filter cannot be handled in a practical manner. The filters clog quickly and therefore have to be removed very frequently for cleaning. This cleaning is unsanitary and is therefore often neglected or postponed for an unacceptably long time. In addition, liquid edible fats and oils are not retained by the filter and enter the sewage system with the filtrate.

Die Aufgabe, diese Nachteile und Fehlfunktionen dieser bekannten Reinigungsanlage zu vermeiden, wird, ausgehend von einer in die Geschirrspülanlage integrierten mechanischen Abwasserbehandlungsstufe, erfindungsgemäß dadurch gelöst, daß die mechanische Abwasserbehandlungsstufe als Schwerkraft-Abscheidestufe ausgebildet ist. Abscheider dieser Gattung sind zwar als Reinigungseinrichtung für mit Leichtstoffen verschmutzte Abwässer bekannt. Nicht bekannt ist jedoch ihr Einsatz als integrierte Reinigungsstufe für die in der Vorspülstufe einer Geschirrspülmaschine anfallenden Abwässer, die Sink- und Schwimmstoffe enthalten können. Mit dem Einsatz einer solchen integrierten Reinigungsstufe sind die Vorteile verbunden, daß jetzt alle in dem Abwasser enthaltenen Inhaltsstoffe zurückgehalten werden und eine hygienische Entnahmemöglichkeit gegeben ist. Da sich die Abscheidestufe innerhalb der Geschirrspülanlage befindet, wird die Entsorgung der (als Wertstoffe anzusehenden) Inhaltsstoffe regelmäßig vorgenommen. Die gesammelten Inhaltsstoffe können jetzt frisch zur Wederaufbereitung gebracht werden.The object of avoiding these disadvantages and malfunctions of this known cleaning system is, based on a mechanical wastewater treatment stage integrated in the dishwasher, achieved according to the invention in that the mechanical wastewater treatment stage is designed as a gravity separation stage. Separators of this type are known as cleaning devices for waste water contaminated with light substances. However, their use as an integrated cleaning stage for the waste water occurring in the pre-rinsing stage of a dishwasher, which may contain sinking and floating substances, is not known. The use of such an integrated cleaning stage has the advantages that all of the ingredients contained in the waste water are now retained and there is a hygienic removal option. Since the separation stage is located inside the dishwasher, the ingredients (which are considered to be valuable) are disposed of regularly. The collected ingredients can now be brought fresh for reprocessing.

Verwendet wird vorzugsweise ein Schwerkraftabscheider, der ohne Luftzutritt arbeitet. Wenn die dort abgetrennten Inhaltsstoffe erfindungsgemäß in Sammelbehälter überführt werden, die ebenfalls kein Luftvolumen enthalten, dann können die Inhaltsstoffe in frischem Zustand zur Wiederverwertung gebracht werden.A gravity separator that works without air access is preferably used. If, according to the invention, the ingredients separated off there are transferred to collection containers which also do not contain any air volume, the ingredients can be brought to recycling in the fresh state.

Was das bei der Schwerkraft-Abscheidung der Inhaltsstoffe anfallende gereinigte Wasser angeht, so ist dieses durchaus geeignet, in der Vorspülstufe als Spülwasser wiederverwendet zu werden. Dies hat gegenüber der bisherigen Praxis der Verwendung von Abwasser aus der Hauptspülstufe den Vorteil, daß die Schmutzstoffe aus der Hauptspülstufe schon eliminiert sind und die Vorspülstufe nicht mehr belasten. Wenn erfindungsgemäß die Abwässer auch chemisch gereinigt, also z. B. die in emulgierten Form vorhandenen Inhaltsstoffe abgetrennt sind, dann kann dieses so gereinigte Wasser durchaus in der Klarspülzone wiederverwendet und damit im Kreislauf geführt werden. Der Frischwasserverbrauch wird dadurch drastisch verringert. Das so gereinigte Abwasser erfüllt des weiteren die Einleitbedingungen und kann in die Kanalisation geleitet werden.As far as the gravitational separation of the ingredients of the purified water is concerned, it is perfectly suitable to be reused in the pre-rinse stage as rinsing water. This has the advantage over the previous practice of using waste water from the main rinse stage that the contaminants from the main rinse stage have already been eliminated and no longer burden the pre-rinse stage. If, according to the invention, the wastewater is also chemically cleaned, e.g. B. the ingredients present in emulsified form are separated, then this purified water can be reused in the rinse zone and can thus be recycled. This drastically reduces fresh water consumption. The wastewater cleaned in this way also fulfills the discharge conditions and can be discharged into the sewage system.

Es ist ferner sehr vorteilhaft, zwei Abwasserkreisläufe einzurichten:

  • Abwässer der Vorspülstufe werden getrennt aufgefangen, gereinigt und nach der Reinigung in diese Stufe rezykliert.
  • Abwässer der Haupt- und Klarspülstufe werden ebenfalls getrennt aufgefangen, können aber, da sie nur gering verschmutzt sind, im Überschuß in die Kanalisation abgeleitet werden.
It is also very advantageous to set up two wastewater cycles:
  • Wastewater from the pre-rinse stage is collected separately, cleaned and recycled into this stage after cleaning.
  • Wastewater from the main and final rinse stages are also collected separately, but, since they are only slightly contaminated, can be discharged into the sewage system in excess.

In der Vorspülstufe werden die festen Schmutzstoffe in der Regel durch ein Grobsieb zurückgehalten. Dieses Sieb muß in regelmäßigen Abständen gesäubert werden. Um diesen Vorgang zu mechanisieren, wird erfindungsgemäß vorgeschlagen, die abgesiebten festen Schmutzstoffe in einem s. g. Naßzerkleinerer zu zerkleinern und mit dem der Vorspülstufe entnommenen ungereinigten Abwasser zu einer Preßentwässerung zu transportieren.In the pre-rinse stage, the solid contaminants are usually retained by a coarse sieve. This sieve must be cleaned at regular intervals. To mechanize this process, it is proposed according to the invention that the screened solid contaminants in a s. G. To shred wet shredder and to transport it to press dewatering with the unpurified wastewater taken from the pre-rinse stage.

Das bei der Preßentwässerung anfallende Preßwasser wird in der anlageneigenen Reinigungsanlage gereinigt und dann in die Vorspülstufe rezykliert. Der Naßzerkleinerer kann sogar für an anderen Stellen des Küchen- bzw. Kantinenbetriebes anfallende feste Schmutzstoffe verwendet werden, die somit ebenfalls einer geregelten Wederverwertung zugeführt werden. Die preßentwässerten Schmutzstoffe werden in dem Sammelbehälter bis zur Entsorgung gestapelt.The press water from press dewatering is cleaned in the plant's own cleaning system and then recycled to the pre-rinse stage. The wet shredder can even be used for solid contaminants that occur in other areas of the kitchen or canteen, which are thus also fed into a controlled recycling process. The press-dewatered contaminants are stacked in the collection container until they are disposed of.

An anderen Stellen anfallende Abwässer mit abscheidbaren Inhaltsstoffen können in der Abscheideranlage des Geschirrspülautomaten mitbehandelt und die gereinigten Abwässer in der Geschirrspülanlage mitverwendet werden. Dadurch ergibt sich eine Zweitnutzung dieser Wässer.Waste water with separable contents occurring at other points can also be treated in the separator system of the dishwasher and the cleaned waste water can also be used in the dishwasher system. This results in a second use of these waters.

Dem Sammelbehälter können schließlich verbrauchte Speiseöle und -fette, wie z. B. Friteusenfett, zugeführt werden, so daß auch deren Entsorgung und Rückführung zur Wederverwertung gesichert ist.The collecting container can finally used cooking oils and fats, such as. B. fryer fat, are supplied so that their disposal and return is secured for recycling.

Claims (13)

  1. Procedure for cleaning dishes in a multi-stage dish washing machine including a freshwater rinsing stage and wash water flow opposite to the direction of transportation of the dishes until the prewash stage, where the waste water from the prewash stage is purified mechanically in an integrated treatment stage and then recirculated into the prewash stage as wash water, characterized in that the mechanical waste water treatment staged is designed as gravity separation.
  2. Procedure according to claim 1, characterized in that the gravity separation stage is provided with the possibility to withdraw accumulated scum and/or settled solids.
  3. Procedure according to claims 1 or 2, characterized in that the waste water following the treatment by gravity separation is also purified chemically and thereafter recirculated into the rinsing stage as rinsing water.
  4. Procedure according to claim 1, characterized in that the waste water from the main washing and rinsing stages is collected separately and discharged into the sewer system and that the waste water from the prewash stage is also collected separately, purified and then recirculated into the prewash stage.
  5. Procedure according to claims 1 to 4, characterized in that the purified but not recirculated waste water is discharged into the sewer system.
  6. Procedure according to claims 1 to 5, characterized in that the gravity separation stage is air sealed.
  7. Procedure according to claim 6, characterized in that the accumulated solids from gravity separation are withdrawn in short time intervals and deposited in a storage bin.
  8. Procedure according to claim 7, characterized in that the storage bins are also air sealed.
  9. Procedure according to claims 1 to 8, characterized in that the solid pollutants are separated in the prewash stage by screening and, thereafter, are disintegrated.
  10. Procedure according to claim 9, characterized in that the disintegrated solids are fed with the raw waste water from the prewash stage into a dewatering press and that the collected water from the dewatering press is purified and then recirculated into the prewash stage.
  11. Procedure according to claim 10, characterized in that wastes from other sources are also fed into the disintegrator.
  12. Procedure according to claim 7, characterized in that waste water from other sources is also cleaned in the integrated waste water treatment stage of the dish washing machine.
  13. Procedure according to claim 6, characterized in that the waste water from other sources is also treated in the gravity separation stage and that the accumulated solids are withdrawn in short time intervals and deposited in a storage bin.
EP93100973A 1992-03-13 1993-01-22 Process for cleaning dishes in multiple stage washing machines Expired - Lifetime EP0560025B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4208030A DE4208030A1 (en) 1992-03-13 1992-03-13 METHOD FOR CLEANING DISHES IN MULTI-STAGE DISHWASHER
DE4208030 1992-03-13

Publications (2)

Publication Number Publication Date
EP0560025A1 EP0560025A1 (en) 1993-09-15
EP0560025B1 true EP0560025B1 (en) 1996-12-27

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP93100973A Expired - Lifetime EP0560025B1 (en) 1992-03-13 1993-01-22 Process for cleaning dishes in multiple stage washing machines

Country Status (3)

Country Link
EP (1) EP0560025B1 (en)
AT (1) ATE146662T1 (en)
DE (2) DE4208030A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8157923B1 (en) 2010-11-08 2012-04-17 Whirlpool Corporation Method of reusing wash and rinse liquid in a dishwasher
US8968483B2 (en) 2012-09-10 2015-03-03 Whirlpool Corporation Method of using liquid in a dishwasher
US9186034B2 (en) 2012-09-05 2015-11-17 Whirlpool Corporation Methods of reusing liquid in a dishwasher

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE408586T1 (en) † 2005-07-14 2008-10-15 Meiko Maschinenbau Gmbh & Co PROCESS WATER TREATMENT IN MULTI-TANK CLEANING MACHINES
DE102005039140A1 (en) * 2005-08-18 2007-02-22 Premark Feg L.L.C., Wilmington Transport dishwasher
DE102005039385A1 (en) 2005-08-20 2007-02-22 Premark Feg L.L.C., Wilmington Transport dishwasher
DE102008005876B3 (en) * 2008-01-24 2009-04-30 Meiko Maschinenbau Gmbh & Co.Kg Method for self-cleaning a continuous dishwasher

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CH262228A (en) * 1948-02-13 1949-06-30 Weiland Carl Method for washing and drying dishes, cutlery, glasses, cans, chocolate molds and the like, and device for carrying out the method.
US3144872A (en) * 1963-08-16 1964-08-18 Detrex Chem Ind Trough-type solvent washer
DE1956050C3 (en) * 1969-11-07 1978-06-01 Meiko Maschinen- Und Apparatebau, Ingenieur Oskar Meier Gmbh & Co, 7600 Offenburg Pre-clearing device for food plates
US3683944A (en) * 1971-01-25 1972-08-15 Sybron Corp Control apparatus for washer-sterilizer
US4228813A (en) * 1979-04-02 1980-10-21 Noren Tore H Low temperature conveyor, rack-type dishwasher
DE4100164C1 (en) * 1991-01-05 1992-04-30 Deutsche Lufthansa Ag, 5000 Koeln, De

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8157923B1 (en) 2010-11-08 2012-04-17 Whirlpool Corporation Method of reusing wash and rinse liquid in a dishwasher
US9186034B2 (en) 2012-09-05 2015-11-17 Whirlpool Corporation Methods of reusing liquid in a dishwasher
US8968483B2 (en) 2012-09-10 2015-03-03 Whirlpool Corporation Method of using liquid in a dishwasher

Also Published As

Publication number Publication date
DE59304846D1 (en) 1997-02-06
ATE146662T1 (en) 1997-01-15
DE4208030A1 (en) 1993-09-16
EP0560025A1 (en) 1993-09-15

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