EP1675496B1 - Geschirrspülverfahren einschliesslich eines biozids - Google Patents

Geschirrspülverfahren einschliesslich eines biozids Download PDF

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Publication number
EP1675496B1
EP1675496B1 EP04770313A EP04770313A EP1675496B1 EP 1675496 B1 EP1675496 B1 EP 1675496B1 EP 04770313 A EP04770313 A EP 04770313A EP 04770313 A EP04770313 A EP 04770313A EP 1675496 B1 EP1675496 B1 EP 1675496B1
Authority
EP
European Patent Office
Prior art keywords
ware
washing
water
ozone
biocide
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.)
Not-in-force
Application number
EP04770313A
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English (en)
French (fr)
Other versions
EP1675496A1 (de
Inventor
Clive Robert Fletcher
Donald Alexander Mackay
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.)
OZONE WASH Pty Ltd
Original Assignee
OZONE WASH Pty Ltd
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Filing date
Publication date
Application filed by OZONE WASH Pty Ltd filed Critical OZONE WASH Pty Ltd
Publication of EP1675496A1 publication Critical patent/EP1675496A1/de
Application granted granted Critical
Publication of EP1675496B1 publication Critical patent/EP1675496B1/de
Not-in-force 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
    • A47L15/42—Details
    • A47L15/4236—Arrangements to sterilize or disinfect dishes or washing liquids
    • A47L15/424—Arrangements to sterilize or disinfect dishes or washing liquids by using ozone
    • 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
    • A47L15/0015—Washing processes, i.e. machine working principles characterised by phases or operational steps other treatment phases, e.g. steam or sterilizing phase
    • 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
    • A47L2601/08—Ozone

Definitions

  • This invention relates to a ware washing process. More particularly, but not exclusively, this invention relates to a ware washing process that is conducted in the presence of a biocide.
  • ware means items which are used in the preparation and consumption of food and drink, including, but not limited to items such as cutlery, crockery, pots, pans and tableware.
  • Industrial and household auto ware washing is presently, conventionally a warm water multistage process, including a prewash stage (typically conducted at temperatures of 35°C - 40°C and wherein bulk soils are removed from the ware), a detergent wash stage (typically conducted at temperatures of 55°C - 65°C and wherein the ware is washed with a detergent) and a rinse stage (typically conducted at temperatures of approximately 85°C and wherein the ware are rinsed so as to remove any residual detergent thereon).
  • the current practice requires operation of washing machines at these relatively high temperatures in order to ensure, first, the breaking of chemical and/or physical bonds between the soils and the item to be washed and, second, the precipitating out of solution of those soils via a chelation or sequestration process.
  • a disadvantage of conventional warm water washing is the increased energy-consumption associated with generating hot water, as well as the increased down-time and maintenance of washing machine components, including boilers and elements, that is required, relative to cold-wash machines.
  • warm water washing means washing at temperatures above 35°C, typically in the range 35°C - 85°C
  • cold water washing means washing at temperatures below 35°C, typically in the range 10°C - 25°C.
  • warm water washing processes tend to generate relatively hot to humid conditions in the machine, which conditions are conducive to the sustainability of various forms of bio organisms such as bacteria, algae, fungi and moulds. These same conditions also create a habitable environment that is favoured by pests such as cockroaches. Accordingly, warm water warewashing processes tend to lend themselves to at least some objectionable, unhygienic consequences.
  • biocides such as ozone
  • the use of biocides, such as ozone, in a warm water washing process is known in order to overcome the above problems.
  • the ozone is typically bubbled through water held in the re-circulating or wash tank of a ware washing machine.
  • DE-A-3232057 and JP-A-04089023 describe a fusion of ozone in water.
  • CN 1235809 describes an ozone sterilizing disk washing machine.
  • One of the disadvantages is that an insufficient amount of ozone is infused into the water so as to completely destroy all the bacteria on the ware in the ware washer.
  • a ware washing process including the steps of:
  • biocide is introduced in gaseous phase into the washing cavity independently of the water; wherein the biocide is introduced at a pH of between 4 and a during a pre-rinse step carried out before the washing step of step (i).
  • the water may be at a temperature below 35°C, preferably between 10°C to 25°C.
  • the biocide may be introduced into the washing cavity in gaseous phase.
  • the biocide is ozone.
  • the ozone is dosed into the washing cavity in the gaseous phase at a rate of 500 to 900 mg/hr, preferably at 780 mg/hour.
  • the ozone is preferably generated by means of an ozone generator having an ozone outlet in fluid flow communication with the washing cavity of the ware washer.
  • the biocide may be introduced into the washing cavity at a temperature in the range of 15°C to 25°C.
  • a pre-rinse stage is introduced prior to washing the ware, the pre-rinse stage being used to remove bulk soil from the ware using water only.
  • the biocide is introduced into the washing cavity at a pH of between 4 and 6.
  • water used in the process and exposed to the biocide may be recycled. It will be appreciated that where the biocide is ozone the water exposed thereto may be ozone infused water.
  • the ware washing detergent may include an inorganic alkali, a complexing agent and at least one surfactant.
  • a caustic alkali is used.
  • the caustic alkali is selected from the class of compounds selected from the group consisting of alkali metal hydroxides. More preferably the inorganic caustic alkali may be sodium hydroxide or potassium hydroxide.
  • the complexing agent may be a compound selected from the group consisting of a phosphate, an amino carboxylic acid, nitrolo triacetic acid (NTA), ethylenediamine tetra-acetic acid (EDTA), a phosphonic acid, a phosphonobutone, an acrylate and any combination thereof.
  • NTA nitrolo triacetic acid
  • EDTA ethylenediamine tetra-acetic acid
  • phosphonic acid a phosphonobutone
  • phosphonobutone phosphonobutone
  • an acrylate any combination thereof.
  • two complexing agents are used, namely EDTA and NTA.
  • the at least one surfactant may be selected from the group consisting of anionic or non-ionic surfactants.
  • the ware washing detergent composition comprises a mixture of surfactants, preferably a mixture including alkyl polyglucoside (for example Triton BG-10) and alkylamino polyethoxy prolypropoxy propanol (for example Triton CF-32).
  • alkyl polyglucoside for example Triton BG-10
  • alkylamino polyethoxy prolypropoxy propanol for example Triton CF-32.
  • the ware washing detergent may include between 0.1% - 55% (m/m) of the inorganic alkali, between 0.1% - 45% (m/m) of the complexing agent, and between 0.05 - 20% (m/m) of surfactant.
  • Additives may also be included in the ware washing detergent, for example anti scaling agents and/or coupling agents.
  • the anti scaling agent used is BayhibitTM AM or Belclene® 650 which are trade names for products in which the active ingredient is 2 phosphonobutane 1,2,4 tricarboxylic acid.
  • the coupling agent is preferably caustic soda lye.
  • the ware washing detergent comprises: Component % composition (by mass) EDTA 4.00 NTA 7.00 Caustic soda lye 40.05 Water (softened) 46.70886 Triton BG-10 0.06615 Triton CF-32 0.08976 BayhibitTM AM or Belclene® 650 0.01963 Water (softened) 2.0656
  • the step of rinsing the wares may include the use of a rinse aid composition which may comprise one or more alkoxylated alcohols; and an acid.
  • the rinse aid composition may include between 0.1% to 90% (m/m) of alkoxylated alcohol, and between 0.1 % to 25% (m/m) of acid.
  • the chain length of the alkoxylated alcohol may be varied between C 4 to C 22 .
  • the alkoxylated alcohol may comprise an ethoxylated alcohol and the degree of ethoxylation of the ethoxylated alcohol may be varied between 1 mole to 30 mole ethylene oxide.
  • a mixture of alkoxylated alcohols is used, the mixture comprising alkoxylated alcohols known in the trade as SynperonicTM LF/RA30 and SynperonicTM LF/RA260.
  • the mixture of the alkoxylated alcohols is 100% active with the cloud point of a 1% solution of the alkoxylated- alcohol in water, at a temperature of less than 22°C.
  • the acid may be an organic acid and may be selected from the group consisting of citric acid, acetic acid, sulfamic acid, phosphoric acid and any combination thereof.
  • the acid is citric acid.
  • the rinse aid composition comprises: Component % composition (by mass) Propyl alcohol 40.00 Citric Acid 0.10 Water (softened) 49.40 SynperonicTM LF/RA30 5.50 SynperonicTM LF/RA260 5.00
  • the rinse aid composition may further include a dye.
  • a ware washer adapted for use in the present invention may be provided as follows.
  • a ware washer connectable to a source of water, the ware washer including a washing cavity, wherein ware in the form of items which are used in the preparation and consumption of food and drink may be loaded therein, a water inlet for introducing water into the washing cavity and at least one inlet for introducing detergent or rinse aid into the washing cavity, the ware washer being characterised in that it includes introduction means for introducing biocide into the washing cavity in gaseous phase sand independently of water so as to provide a gaseous atmosphere thereof within the washing cavity.
  • the biocide is ozone and the introduction means includes an ozone generator having an ozone outlet in fluid communication with the washing cavity of the war washer.
  • the biocide introduction means may be separate from the means for introducing water into the washing cavity.
  • the washing cavity may be accessed by means of a door and may be configured to receive ware therein.
  • the ware washer will be in fluid flow communication with a source of water and will have a water inlet, wherein water is introduced into the washing cavity, and a water outlet, wherein dirty water is disposed of.
  • biocide infused water may be recycled by means of a recycling system.
  • the ware washer also includes means for introducing a ware washing detergent and/or a rinse aid composition into the washing cavity.
  • Example 1 Experimental Procedure for the Determination of the Efficacy of Ozone as a Biocide in Ware Washing
  • Hobart F25 ware washer (10) used had been modified (not shown) by disconnecting the heating elements so that the ware washing process could only be carried out at ambient temperatures within the cold water washing range.
  • the particular results discussed below were conducted and recorded at an ambient temperature of 17.4°C.
  • the ware washer (10) was further modified by including an ozone generator (15) having an ozone outlet (20) in fluid flow communication with a washing cavity (25) of the ware washer (10), so that ozone in gaseous phase could be introduced into the washing cavity (25) thereby to create an atmosphere of ozone therein.
  • the washing cavity (25) can be accessed by means of a door (30) through which ware (32) may be loaded into the ware washer (10).
  • the ware washer (10) is connected to a source of water (not shown) and has an inlet (35) for water and an outlet (40) for soiled water.
  • the ware washer (10) also includes inlets (45) for introducing detergents and / or rinse aids into the washing cavity (25).
  • the Hobart F25 ware washer was operated on a 6 minute ware washing process that included a pre-rinse cycle, a wash cycle and a rinse cycle.
  • the detergent and rinse aid were both dosed automatically into the washing machine.
  • Example 2 Description of the Cycles in a Preferred Cold Warewashing Process
  • the ware washing process used in the evaluation of the efficacy of ozone as a biocide in ware washers was a 6 minute cycle which included a pre-rinse cycle, wash cycle and rinse cycle. Both the detergent as well as the rinse aid (as described above) were automatically dosed into the ware washer at a rate of 50 m l per 20 l water for the detergent and 25 m l per 20 l water for rinse aid.
  • the ozone was dosed into the ware washer in a gaseous phase at a rate of 780 mg per hour.
  • the ozone generating unit was designed to commence dispensing ozone into the ware washer on activation of the ware washer, and to cease operation when the washing cycle had been completed.
  • Example 2 The experimental procedure as described in Example 1 were repeated, varying only the rate of addition of ozone into the ware washer from 500 mg per hour to 900 mg per hour. Consideration and comparison of the results obtained revealed that the optimum was found at 780 mg per hour.
  • the optimum dosages for the detergent and rinse aid were found, similarly, to be 50 m l per 20 l water and 25 m l per 25 l water respectively, although this could vary substantially depending on the degree of soiling and also bacterial load.

Landscapes

  • Detergent Compositions (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
  • Washing And Drying Of Tableware (AREA)

Claims (5)

  1. Geschirrspülverfahren, umfassend die Schritte:
    (i) Waschen von Geschirr in der Form von Produkten, die bei der Zubereitung und dem Verzehr von Nahrungsmittel und Getränk verwendet werden, in einem Spülhohlraum einer Geschirrspülmaschine mit Wasser und einem Geschirrspülmittel;
    (ii) Spülen des Geschirrs in der Geschirrspülmaschine mit Wasser und
    (iii) Einführen eines Biozids in den Spülhohlraum des Geschirrspülers, um eine gasförmige Atmosphäre davon im Spülhohlraum bereitzustellen, wobei das Biozid in gasförmiger Phase in den Spülhohlraum unabhängig vom Wasser eingeführt wird,
    dadurch gekennzeichnet , dass das Biozid bei einem pH von zwischen 4 und 6 während eines Vorspülgangs, der vor dem Spülgang von Schritt (i) durchgeführt wird, eingeführt wird.
  2. Geschirrspülverfahren gemäß Anspruch 1, wobei das Biozid bei einer Temperatur von zwischen 15°C und 25°C in den Hohlraum eingeführt wird.
  3. Geschirrspülverfahren gemäß einem der vorangehenden Ansprüche, wobei Wasser, das in dem Geschirrspülverfahren verwendet wird und dem Biozid ausgesetzt ist, recycelt wird.
  4. Geschirrspülverfahren gemäß einem der vorangehenden Ansprüche, wobei das Biozid Ozon ist.
  5. Geschirrspülverfahren gemäß Anspruch 4, wobei das Ozon mit Hilfe eines Ozongenerators erzeugt wird, der einen Ozonauslass in Fluidströmungsverbindung mit dem Spülhohlraum des Geschirrspülers hat.
EP04770313A 2003-10-24 2004-10-22 Geschirrspülverfahren einschliesslich eines biozids Not-in-force EP1675496B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA200308306 2003-10-24
PCT/IB2004/052178 WO2005039377A1 (en) 2003-10-24 2004-10-22 Tableware-washing process including a biocide

Publications (2)

Publication Number Publication Date
EP1675496A1 EP1675496A1 (de) 2006-07-05
EP1675496B1 true EP1675496B1 (de) 2012-09-26

Family

ID=34523473

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04770313A Not-in-force EP1675496B1 (de) 2003-10-24 2004-10-22 Geschirrspülverfahren einschliesslich eines biozids

Country Status (6)

Country Link
US (1) US20090199874A1 (de)
EP (1) EP1675496B1 (de)
AU (1) AU2004283557B2 (de)
ES (1) ES2393552T3 (de)
WO (1) WO2005039377A1 (de)
ZA (1) ZA200507054B (de)

Families Citing this family (13)

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US7897642B1 (en) * 2002-06-19 2011-03-01 Dr. Irvine Dubow Compositions and methods for dry eye syndrome
US8420699B1 (en) 2002-06-19 2013-04-16 Irvine L. Dubow Composition and methods of treatment using deionized and ozonated solution
DE102006052890A1 (de) * 2006-11-09 2008-05-15 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zur Desinfektion von Leitungssystemen eines wasser-führenden Haushaltsgeräts sowie derartiges Haushaltsgerät
PL2185052T3 (pl) * 2007-08-16 2014-09-30 Arcelik As Zmywarka do naczyń
US8802611B2 (en) * 2010-05-03 2014-08-12 Ecolab Usa Inc. Highly concentrated caustic block for ware washing
ITTO20100825A1 (it) 2010-10-07 2012-04-08 Indesit Co Spa Macchina lavastoviglie con cicli di pulizia e metodo di igienizzazione di tale macchina.
US8157923B1 (en) * 2010-11-08 2012-04-17 Whirlpool Corporation Method of reusing wash and rinse liquid in a dishwasher
US9078554B2 (en) * 2012-01-11 2015-07-14 General Electric Company Dishwasher appliance with ozone level monitoring
US20140020718A1 (en) * 2012-07-19 2014-01-23 Whirlpool Corporation Dishwasher with ozone generator
US10767137B2 (en) * 2014-04-23 2020-09-08 Sageway Solutions, Llc Cleaning formulations for chemically sensitive individuals: compositions and methods
KR101611297B1 (ko) * 2014-07-21 2016-04-11 엘지전자 주식회사 식기세척기의 제어방법
US20190191957A1 (en) * 2017-12-26 2019-06-27 VA DESIGNS , Ltd. Method for having cleaner dishes
JP7273233B1 (ja) 2022-10-21 2023-05-12 株式会社アルボース 自動食器洗浄機用洗浄剤組成物および自動食器洗浄機による食器の洗浄方法

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Also Published As

Publication number Publication date
WO2005039377A1 (en) 2005-05-06
AU2004283557A1 (en) 2005-05-06
AU2004283557B2 (en) 2011-04-28
ZA200507054B (en) 2006-05-31
US20090199874A1 (en) 2009-08-13
ES2393552T3 (es) 2012-12-26
EP1675496A1 (de) 2006-07-05

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