EP0560025A1 - 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
EP0560025A1
EP0560025A1 EP93100973A EP93100973A EP0560025A1 EP 0560025 A1 EP0560025 A1 EP 0560025A1 EP 93100973 A EP93100973 A EP 93100973A EP 93100973 A EP93100973 A EP 93100973A EP 0560025 A1 EP0560025 A1 EP 0560025A1
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EP
European Patent Office
Prior art keywords
stage
rinse
wastewater
water
recycled
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.)
Granted
Application number
EP93100973A
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German (de)
French (fr)
Other versions
EP0560025B1 (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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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 continuous washing systems.
  • These automatic dishwashers contain at least one pre-rinse stage ("pre-clearing zone"), a main rinse stage and a final rinse zone in which fresh water mixed with rinse aid is used.
  • the rinse water is circulated in the individual rinse stages by means of pumps and sieved in the process.
  • the fresh water which is reduced by towing losses, flows through the flushing system via cascades in counterflow to the direction of transport and is discarded at the inlet as waste water after it has been freed from contaminants influencing the discharge conditions mechanically (light liquid separator with sludge trap) or physico-chemically (emulsion splitting system) has been.
  • the wastewater treatment plant is usually installed far away from the flushing system and is therefore neglected. During the cleaning intervals of the separator, the time intervals specified in the standard are often not observed. The then disposed of separator content can only be disposed of as special waste because it has decomposed into non-recyclable substances through acid fermentation.
  • the task of improving the wastewater treatment of the dishwasher and thereby obtaining the ingredients in a recyclable form is now achieved in that the wastewater obtained in the pre-rinse stage is mechanically and optionally chemically cleaned in an integrated treatment stage.
  • the arrangement of the wastewater treatment stage (s) in the rinsing system opens up the possibility of disposing of the separated wastewater ingredients in a fresh and thus recyclable state at short intervals. This is preferably done in a separator that works without air. If the ingredients separated off there are transferred according to the invention into a container which also contains no air volume, then the ingredients can be collected without decomposition and given for recycling.
  • the wastewater from the separation of the ingredients is perfectly suitable to be reused in the pre-rinse stage as rinse water: This has the advantage over the previous practice of using wastewater from the main rinse stage that the contaminants from the main rinse stage are already eliminated are and no longer burden the pre-rinse stage. If, according to the invention, the wastewater is also chemical cleaned, for example, the ingredients present in the emulsified form are separated, then this purified water can be reused in the rinse aid zone and can therefore 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 wastewater from the pre-rinse stage is collected separately and recycled into this stage after cleaning; the wastewater from the main and rinse stages are also collected separately, but, since they are only slightly contaminated, can be discharged into the sewage system in excess.
  • the solid contaminants are usually retained by a coarse screen. This sieve must be cleaned at regular intervals.
  • 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 recycled in a controlled manner.
  • the press-dewatered contaminants are in the collection container stacked for disposal. Any other waste water with separable contents can be treated in the separator system of the automatic dishwasher and the cleaned waste water can also be used in the flushing system. This results in a second use of these waters.

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 Durchlaufspülanlagen. Diese Geschirrspülautomaten enthalten mindestens eine Vorspülstufe ("Vorabräumzone"), eine Hauptspülstufe und eine abschließende Klarspülzone, in der mit Klarspülmittel versetztes Frischwasser eingesetzt wird. Das Spülwasser wird mittels Pumpen in den einzelnen Spülstufen umgewälzt und dabei gesiebt. Das um Ausschleppverluste verringerte Frischwasser durchströmt die Spülanlage über Kaskaden im Gegenstrom zur Transportrichtung und wird am Einlauf als Abwasser verworfen, nachdem es in der vorgeschriebenen Weise mechanisch (Leichtflüssigkeitsabscheider mit Schlammfang) oder physiko-chemisch (Emulsionsspaltanlage) von die Einleitbedingungen beeinflussenden Schmutzstoffen befreit worden ist. Die Abwasserbehandlungsanlage ist in der Regel örtlich weit weg von der Spülanlage installiert und wird demnach auch vernachlässigt. Bei den Reinigungsintervallen des Abscheiders werden oft die in der Norm vorgegebenen Zeitabstände nicht eingehalten. Der dann entsorgte Abscheiderinhalt ist nur noch als Sonderabfall zu beseitigen, weil er sich durch saure Gärung in nicht wiederverwertbare Stoffe zersetzt hat.The invention relates to a new method for cleaning dishes in the known multi-stage continuous washing systems. These automatic dishwashers contain at least one pre-rinse stage ("pre-clearing zone"), a main rinse stage and a final rinse zone in which fresh water mixed with rinse aid is used. The rinse water is circulated in the individual rinse stages by means of pumps and sieved in the process. The fresh water, which is reduced by towing losses, flows through the flushing system via cascades in counterflow to the direction of transport and is discarded at the inlet as waste water after it has been freed from contaminants influencing the discharge conditions mechanically (light liquid separator with sludge trap) or physico-chemically (emulsion splitting system) has been. The wastewater treatment plant is usually installed far away from the flushing system and is therefore neglected. During the cleaning intervals of the separator, the time intervals specified in the standard are often not observed. The then disposed of separator content can only be disposed of as special waste because it has decomposed into non-recyclable substances through acid fermentation.

Die Aufgabe, die Abwasserbehandlung der Geschirrspülanlage zu verbessern und dabei die Inhaltsstoffe in wiederverwertbarer Form zu gewinnen, wird nunmehr dadurch gelöst, daß das in der Vorspülstufe anfallende Abwasser in einer integrierten Behandlungsstufe mechanisch und ggf. chemisch gereinigt wird. Die Anordnung der Abwasserbehandlungsstufe(n) in der Spülanlage eröffnet die Möglichkeit, die abgetrennten Abwasser-Inhaltsstoffe in kurzen Zeitabständen in frischem und damit wiederverwertbarem Zustand zu entsorgen. Dies geschieht vorzugsweise in einem Abscheider, der ohne Luftzutritt arbeitet. Wenn die dort abgetrennten Inhaltsstoffe erfindungsgemäß in einen Behälter überführt werden, der ebenfalls kein Luftvolumen enthält, dann können die Inhaltsstoffe ohne Zersetzung gesammelt und zur Widerverwertung gegeben werden.The task of improving the wastewater treatment of the dishwasher and thereby obtaining the ingredients in a recyclable form is now achieved in that the wastewater obtained in the pre-rinse stage is mechanically and optionally chemically cleaned in an integrated treatment stage. The arrangement of the wastewater treatment stage (s) in the rinsing system opens up the possibility of disposing of the separated wastewater ingredients in a fresh and thus recyclable state at short intervals. This is preferably done in a separator that works without air. If the ingredients separated off there are transferred according to the invention into a container which also contains no air volume, then the ingredients can be collected without decomposition and given for recycling.

Was das bei der Abtrennung der Inhaltsstoffe anfallende 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 emulgierter 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 water from the separation of the ingredients is concerned, it is perfectly suitable to be reused in the pre-rinse stage as rinse water: This has the advantage over the previous practice of using wastewater from the main rinse stage that the contaminants from the main rinse stage are already eliminated are and no longer burden the pre-rinse stage. If, according to the invention, the wastewater is also chemical cleaned, for example, the ingredients present in the emulsified form are separated, then this purified water can be reused in the rinse aid zone and can therefore 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 denkbar und sehr vorteilhaft, zwei Abwasserkreisläufe einzurichten: die Abwässer der Vorspülstufe werden getrennt aufgefangen und nach Reinigung in diese Stufe rezykliert; die Abwässer der Haupt- und Klarspülstufe werden ebenfalls getrennt aufgefangen, können aber, da sie nur gering verschmutzt werden, im Überschuß in die Kanalisation abgeleitet werden.It is also conceivable and very advantageous to set up two wastewater circuits: the wastewater from the pre-rinse stage is collected separately and recycled into this stage after cleaning; the wastewater from the main and 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 Schmutzstoffe in einem sog. Naßzerkleinerer zu zerkleinern und mit der Vorspülstufe entnommenem ungereinigten Abwasser zu einer Preßentwässerung zu transportieren. Das bei der Preßentwässerung anfallende Preßwasser wird in der anlageneigenen Reinigungsanlage gesäubert und dann in die Vorspülstufe rezykliert. Der Naßzerkleinerer kann sogar für an anderen Stellen des Küchen- bzw. Kantinenbetriebs anfallende feste Schmutzstoffe verwendet werden, die somit ebenfalls einer geregelten Wiederverwertung zugeführt werden. Die preßentwässerten Schmutzstoffe werden in dem Sammelbehälter bis zur Entsorgung gestapelt. An anderen Stellen anfallende Abwässer mit abscheidbaren Inhaltsstoffen können in der Abscheideranlage des Spülautomaten mitbehandelt und die gereinigten Abwässer in der Spülanlage mitverwendet werden. Dadurch ergibt sich eine Zweitnutzung dieser Wässer.In the pre-rinse stage, the solid contaminants are usually retained by a coarse screen. This sieve must be cleaned at regular intervals. In order to mechanize this process, it is proposed according to the invention to shred the screened contaminants in a so-called wet shredder and to transport the unpurified waste water removed with the pre-rinse stage to a press dewatering. 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 recycled in a controlled manner. The press-dewatered contaminants are in the collection container stacked for disposal. Any other waste water with separable contents can be treated in the separator system of the automatic dishwasher and the cleaned waste water can also be used in the flushing 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 Wiederverwertung gesichert ist.Finally, used edible oils and fats, e.g. Fryer fat, are supplied so that their disposal and return for recycling is ensured.

Claims (10)

Verfahren zum Reinigen von Geschirr in mehrstufigen Spülanlagen mit frischwasserbetriebener Klarspülstufe und im Gegenlauf zur Geschirrtransportrichtung erfolgendem Spülwasserdurchlauf bis zur Vorspülstufe, dadurch gekennzeichnet, daß das in der Vorspülstufe anfallende Abwasser in einer integrierten Behandlungsstufe mechanisch und ggf. chemisch gereinigt wird.Process for cleaning dishes in multi-stage dishwashing systems with a fresh water-operated rinse stage and in the opposite direction to the dishwashing direction of the dishwashing water through to the pre-wash stage, characterized in that the waste water obtained in the pre-wash stage is mechanically and optionally chemically cleaned in an integrated treatment stage. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das mechanisch gereinigte Abwasser in die Vorspülstufe als Spülwasser rezykliert wird.A method according to claim 1, characterized in that the mechanically cleaned waste water is recycled into the pre-rinse stage as rinse water. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das auch chemisch gereinigte Abwasser in die Klarspülzone als Spülwasser rezykliert wird.A method according to claim 1, characterized in that the wastewater, which is also chemically purified, is recycled into the rinse zone as rinsing water. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Abwässer der Haupt- und Klarspülzone getrennt aufgefangen und in die Kanalisation abgeleitet werden und daß die Abwässer der Vorspülstufe getrennt aufgefangen, gereinigt und nach der Reinigung in die Vorspülstufe rezykliert werden.A method according to claim 1, characterized in that the wastewater from the main and rinse zones are collected separately and discharged into the sewage system and that the wastewater from the pre-rinse stage is collected separately, cleaned and recycled to the pre-rinse stage after cleaning. Verfahren nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß die nicht rezyklierten Abwasseranteile nach der Reinigung der Kanalisation zugeführt werden.Process according to Claims 1 to 4, characterized in that the non-recycled wastewater components are fed to the sewer system after cleaning. Verfahren nach Anspruch 1 bis 5, dadurch gekennzeichnet, daß die Abscheidung der Abwasserinhaltsstoffe in einem Schwerkraft-Abscheider unter Luftabschluß vorgenommen wird und die abgeschiedenen Inhaltsstoffe in kurzen Zeitabständen in einen gegebenfalls unter Luftabschluß stehenden Sammelbehälter überführt werden.Process according to Claims 1 to 5, characterized in that the waste water constituents are separated off in a gravity separator with the exclusion of air and the separated constituents are transferred at short time intervals into a collecting container which may be sealed off with air. Verfahren nach Anspruch 1 bis 6, dadurch gekennzeichnet, daß die in der Vorspülstufe anfallenden, vorzugsweise durch Sieben abgetrennten festen Schmutzstoffe zerkleinert und mit der Vorspülstufe entnommenem ungereinigtem Abwasser zur Preßentwässerung transportiert werden, und daß das bei der Preßentwässerung anfallende Preßwasser gereinigt und dann wieder in die Vorspülstufe rezykliert wird.Method according to claims 1 to 6, characterized in that the solid contaminants accumulating in the pre-rinse stage, preferably separated by sieving, are comminuted and untreated waste water removed with the pre-rinse stage is transported to the press drainage, and in that the press water obtained in the press drainage is cleaned and then returned to the Pre-rinse stage is recycled. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß dem Zerkleinerer aus anderen Anfallstellen stammende Abfälle zugeführt werden.Method according to claim 7, characterized in that waste originating from other sources is fed to the shredder. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß in der Abwasserbehandlungsstufe der Spülanlage auch aus anderen Abwasseranfallstellen stammende Abwässer gereinigt werden.A method according to claim 7, characterized in that in the wastewater treatment stage of the rinsing system, wastewater from other wastewater sources is also cleaned. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß in dem Abscheider auch an anderen Stellen anfallende verschmutzte Abwässer behandelt und die dabei abgetrennten Inhaltsstoffe in den Sammelbehälter überführt werden.A method according to claim 6, characterized in that contaminated wastewater occurring at other points is also treated in the separator and the constituents separated off are transferred to the collecting container.
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
DE4208030 1992-03-13
DE4208030A DE4208030A1 (en) 1992-03-13 1992-03-13 METHOD FOR CLEANING DISHES IN MULTI-STAGE DISHWASHER

Publications (2)

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

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EP93100973A Expired - Lifetime EP0560025B1 (en) 1992-03-13 1993-01-22 Process for cleaning dishes in multiple stage washing machines

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007021786A2 (en) * 2005-08-18 2007-02-22 Premark Feg L.L.C. Conveyor ware washer
WO2007024491A2 (en) * 2005-08-20 2007-03-01 Premark Feg L.L.C. Conveyor ware washer
WO2009092404A1 (en) * 2008-01-24 2009-07-30 Meiko Maschinenbau Gmbh & Co. Kg Method for self-cleaning of a continuous dishwasher and corresponding dishwasher
EP1743871B2 (en) † 2005-07-14 2012-06-27 MEIKO Maschinenbau GmbH & Co. KG Waste water treatment in automatic multi-tank cleaning devices

Families Citing this family (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

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US3144872A (en) * 1963-08-16 1964-08-18 Detrex Chem Ind Trough-type solvent washer
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US4228813A (en) * 1979-04-02 1980-10-21 Noren Tore H Low temperature conveyor, rack-type 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
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

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1743871B2 (en) † 2005-07-14 2012-06-27 MEIKO Maschinenbau GmbH & Co. KG Waste water treatment in automatic multi-tank cleaning devices
WO2007021786A2 (en) * 2005-08-18 2007-02-22 Premark Feg L.L.C. Conveyor ware washer
WO2007021786A3 (en) * 2005-08-18 2007-09-27 Premark Feg Llc Conveyor ware washer
WO2007024491A2 (en) * 2005-08-20 2007-03-01 Premark Feg L.L.C. Conveyor ware washer
WO2007024491A3 (en) * 2005-08-20 2007-09-27 Premark Feg Llc Conveyor ware washer
US8342194B2 (en) 2005-08-20 2013-01-01 Premark Feg L.L.C. Conveyor ware washer
WO2009092404A1 (en) * 2008-01-24 2009-07-30 Meiko Maschinenbau Gmbh & Co. Kg Method for self-cleaning of a continuous dishwasher and corresponding dishwasher
CN101925322B (en) * 2008-01-24 2012-09-05 迈科机械制造有限及两合公司 Method for self-cleaning of continuous dishwasher and corresponding dishwasher
US8491723B2 (en) 2008-01-24 2013-07-23 Meiko Maschinenbau Gmbh & Co. Kg Method for self-cleaning of a continuous dishwasher

Also Published As

Publication number Publication date
EP0560025B1 (en) 1996-12-27
DE59304846D1 (en) 1997-02-06
ATE146662T1 (en) 1997-01-15
DE4208030A1 (en) 1993-09-16

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