WO2018231131A1 - A method for disinfection and cleaning of at least one part of a device intended for recycling of water - Google Patents

A method for disinfection and cleaning of at least one part of a device intended for recycling of water Download PDF

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Publication number
WO2018231131A1
WO2018231131A1 PCT/SE2018/050610 SE2018050610W WO2018231131A1 WO 2018231131 A1 WO2018231131 A1 WO 2018231131A1 SE 2018050610 W SE2018050610 W SE 2018050610W WO 2018231131 A1 WO2018231131 A1 WO 2018231131A1
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WO
WIPO (PCT)
Prior art keywords
disinfection
filter
lactic acid
water
cleaning
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.)
Ceased
Application number
PCT/SE2018/050610
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French (fr)
Inventor
Gustav REHN
Stephan ESKILANDER
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Orbital Systems AB
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Orbital Systems AB
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Filing date
Publication date
Application filed by Orbital Systems AB filed Critical Orbital Systems AB
Priority to EP18817153.2A priority Critical patent/EP3638861B1/en
Priority to US16/621,406 priority patent/US20200101185A1/en
Publication of WO2018231131A1 publication Critical patent/WO2018231131A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2/00—Disinfection or sterilisation of materials or objects, in general; Accessories therefor
    • A61L2/16—Disinfection or sterilisation of materials or objects, in general; Accessories therefor using chemical substances
    • A61L2/18—Liquid substances
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N37/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids
    • A01N37/36—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing at least one carboxylic group or a thio analogue, or a derivative thereof, and a singly bound oxygen or sulfur atom attached to the same carbon skeleton, this oxygen or sulfur atom not being a member of a carboxylic group or of a thio analogue, or of a derivative thereof, e.g. hydroxy-carboxylic acids
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N63/00—Biocides, pest repellants or attractants, or plant growth regulators containing microorganisms, viruses, microbial fungi, animals or substances produced by, or obtained from, microorganisms, viruses, microbial fungi or animals, e.g. enzymes or fermentates
    • A01N63/50—Isolated enzymes; Isolated proteins
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
    • C02F1/685—Devices for dosing the additives
    • C02F1/686—Devices for dosing liquid additives
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B1/00—Methods or layout of installations for water supply
    • E03B1/04—Methods or layout of installations for water supply for domestic or like local supply
    • E03B1/041—Greywater supply systems
    • E03B1/042—Details thereof, e.g. valves or pumps
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/02—Plumbing installations for fresh water
    • E03C1/04—Water-basin installations specially adapted to wash-basins or baths
    • E03C1/0408—Water installations especially for showers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2101/00—Chemical composition of materials used in disinfecting, sterilising or deodorising
    • A61L2101/32—Organic compounds
    • A61L2101/36—Carboxylic acids or derivatives thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2202/00—Aspects relating to methods or apparatus for disinfecting or sterilising materials or objects
    • A61L2202/10—Apparatus features
    • A61L2202/14—Means for controlling sterilisation processes, data processing, presentation and storage means, e.g. sensors, controllers, programs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2202/00—Aspects relating to methods or apparatus for disinfecting or sterilising materials or objects
    • A61L2202/10—Apparatus features
    • A61L2202/17—Combination with washing or cleaning means
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/006—Cartridges
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/20—Prevention of biofouling
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/04—Surfactants, used as part of a formulation or alone
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2307/00—Location of water treatment or water treatment device
    • C02F2307/06—Mounted on or being part of a faucet, shower handle or showerhead
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B1/00—Methods or layout of installations for water supply
    • E03B1/04—Methods or layout of installations for water supply for domestic or like local supply
    • E03B1/041—Greywater supply systems
    • E03B2001/045—Greywater supply systems using household water
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/30—Relating to industrial water supply, e.g. used for cooling

Definitions

  • the present invention relates to a method for disinfection and cleaning of a water recycling device.
  • the hybrid device for a recirculation shower, allowing purification and either recycling of water or discarding of water.
  • the hybrid device comprises a recirculation loop, a filter system with a pre-filter and a nano-filter, at least one filter quality sensor, and the device is arranged to redirect the water from recirculation to drainage when the at least one filter quality sensor indicates the need thereof.
  • the present invention is directed to a disinfection and cleaning method suitable for water recycling devices.
  • the water recycling devices may be of any application type, such as e.g. recirculating showers, recirculating dishwashers or recirculating washing machines.
  • the method is especially suitable for water recirculating devices used domestically, but also other usage is totally possible. Examples are recirculating showers systems used in hotels and bathhouses. Fact is that any type of such system, used industrially or domestically, is of interest for the method according to the present invention.
  • the present invention is directed to providing an optimal disinfection and cleaning method for water recirculating systems mentioned above.
  • the method involves both disinfection implying killing or inactivating bacteria and microorganisms, and also cleaning implying to remove dead or inactivated bacteria and microorganisms from tubing etc.
  • the latter step can be seen as an antifouling step, so that the material is possible to be flush out from the water recirculating system or device so such material is not accumulated in the system.
  • the method involves at least flowing lactic acid into the part intended to receive disinfection treatment.
  • Lactic acid may be used alone or in combination with other substances.
  • the method involves flowing both an antibacterial agent for the disinfection and also an antifouling agent for the cleaning into the part intended to receive the disinfection and cleaning.
  • the antibacterial agent may be lactic acid.
  • the flowing of the antibacterial agent and antifouling agent may be performed simultaneously or sequentially.
  • the substances intended to be used in the method according to the present invention have the advantage of being environmental friendly and biologically degradable to a large extent.
  • As the disinfection and cleaning method according to the present invention is intended to be used in devices intended to save water and energy the aspect above is of great importance.
  • the usage of environmental friendly and biologically degradable substances which has a very low negative impact on water and energy loss and use of chemicals is of course preferable in water recirculating systems, and in fact also in other systems where water is used and some amounts are wasted.
  • both lactic acid and citric acid, and also several enzyme or surfactant based substances are easy to use and inexpensive.
  • the device intended for method comprises a flow path for recycled water.
  • Other units of the device are a fresh water inlet, a recirculation water inlet and a recirculation water outlet, a user outlet, a pump, sensors, valves, a heater and a filter.
  • the method involves flowing lactic acid, citric acid and/or an enzyme based or surfactant based solution into at least part of the flow path for recycled water.
  • One part of special interest for the method is the user outlet. In this part and the tubing in close proximity to the user outlet there is an evident risk for growth of bacteria and microorganisms. Therefore, this part is of special interest for the method according to the present invention.
  • the process order subsequent to the filter is the heater and then finally the user outlet and wherein flowing of lactic acid, citric acid and/or an enzyme based or surfactant based solution is performed into at least the user outlet of the device.
  • lactic acid may be used, but also in combination with an enzyme based and/or surfactant based solution.
  • the flowing of lactic acid, citric acid and/or an enzyme or surfactant based solution is provided from the filter into the system and thus into all of the system arranged subsequent to the filter, also comprising the heater and the user outlet.
  • a disposable filter unit is replaced with a cartridge containing the lactic acid, citric acid and/or an enzyme or surfactant based solution for allowing for performing the disinfection treatment.
  • the cartridge is of course also a disposable to be used for the disinfection and cleaning of the system.
  • the time point for performing the disinfection and cleaning may vary, but is intended to be performed at a decided time. This can be set by the system as such, e.g. when sensors are giving data to the processor that it is time for performing a disinfection and cleaning cycle. In such a case the system will inform a user that the method should be performed. Also a set certain use period (weeks, months) or a number of use cycles may be the parameters deciding when the method for disinfecting and cleaning should be performed.
  • the filter of the system is a disposable filter unit also comprising a dosing capsule containing lactic acid, citric acid and/or an enzyme or surfactant based solution and wherein the dosing capsule discharges the content when the filter is pressurized.
  • the dosing of the lactic acid, citric acid and/or an enzyme or surfactant based solution may be performed during a time sequence in the beginning of usage of a new filter or may in fact be dosed based on a slow release technique so that the substance(s) are added continuously into the system at a suitable amount.
  • the lactic acid, citric acid and/or an enzyme or surfactant based solution is provided in a dosage container which content is poured into a drainage and thus into a recirculation loop to be flowed into the filter, the heater and the user outlet. Also in this case the substance(s) reached the user outlet and disinfects and cleans also this part. In this case, then the disinfection and cleaning is performed as a first cycle, such as during the first 10 minutes, when a new disposable filter unit is placed into the system.
  • the water recirculating device may be of different type. Examples are showers, both domestically or at hotels or bathhouses, washing machines, or dish washers etc. According to one embodiment, the device intended for usage and recycling of water is a recirculating shower. As should be evident, when the disinfection and cleaning method is being performed, then regular use is not performed at the same time.
  • a water recirculating device in this case a recirculating shower, in which the method according to one embodiment of the present invention may be used.
  • the device comprises a fresh water inlet, both cold and hot, the water flowed in here meets a recirculation loop comprising a recirculation water inlet, which in fact is one point along the loop before subsequent key units being a filter and then a heater.
  • the user outlet is provided subsequently to the heater.
  • a drain being a point from which water is either wasted via the water recirculation outlet or sent to recirculation.
  • the opening of valves may be used.
  • sensors providing data to the processing unit and also a pump providing recirculating force are other units not shown in fig. 1 .
  • FIG. 2 there is shown a schematic view of the disinfecting (descaling) effect and cleaning effect when using lactic acid as the disinfecting agent and a surfactant as the cleaning agent according to the present invention.

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Zoology (AREA)
  • Veterinary Medicine (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Epidemiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Medicinal Chemistry (AREA)
  • Environmental Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Dentistry (AREA)
  • Plant Pathology (AREA)
  • Pest Control & Pesticides (AREA)
  • Agronomy & Crop Science (AREA)
  • Virology (AREA)
  • Microbiology (AREA)
  • Biotechnology (AREA)
  • Proteomics, Peptides & Aminoacids (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

The present invention describes a method for disinfection and cleaning of at least one part of a device intended for recycling of water, said method involving flowing lactic acid, citric acid and/or an enzyme based or surfactant based solution into the part intended to receive the disinfection and cleaning. Elected for publication.

Description

A METHOD FOR DISINFECTION AND CLEANING OF AT LEAST ONE PART OF A DEVICE INTENDED FOR RECYCLING OF WATER
Field of the invention
The present invention relates to a method for disinfection and cleaning of a water recycling device.
Technical Background
There are different water recycling devices known today. One example is shown in WO 2013/095278 where there is disclosed a hybrid device for a recirculation shower, allowing purification and either recycling of water or discarding of water. The hybrid device comprises a recirculation loop, a filter system with a pre-filter and a nano-filter, at least one filter quality sensor, and the device is arranged to redirect the water from recirculation to drainage when the at least one filter quality sensor indicates the need thereof.
The present invention is directed to a disinfection and cleaning method suitable for water recycling devices. The water recycling devices may be of any application type, such as e.g. recirculating showers, recirculating dishwashers or recirculating washing machines. The method is especially suitable for water recirculating devices used domestically, but also other usage is totally possible. Examples are recirculating showers systems used in hotels and bathhouses. Fact is that any type of such system, used industrially or domestically, is of interest for the method according to the present invention.
Moreover, it should be noted that the common feature of the water recirculating systems intended above is the possibility of recirculating water to be recycled and reused. Water being contaminated, or a liquid fraction containing contaminants, however, should be flowed to a drain. Also this fraction may be recycled in another system or collected depending on the kind of system and type of contaminants.
The present invention is directed to providing an optimal disinfection and cleaning method for water recirculating systems mentioned above.
Summary of the invention
The latter stated purpose above is achieved by a method for disinfection and cleaning of at least one part of a device intended for recycling of water, said method involving flowing lactic acid, citric acid and/or an enzyme or surfactant based solution into the part intended to receive the disinfection and cleaning.
In relation to the method according to the present invention it should be mentioned that the method involves both disinfection implying killing or inactivating bacteria and microorganisms, and also cleaning implying to remove dead or inactivated bacteria and microorganisms from tubing etc. The latter step can be seen as an antifouling step, so that the material is possible to be flush out from the water recirculating system or device so such material is not accumulated in the system.
Specific embodiments of the invention
Below there is disclosed and discussed different embodiment of the method according to the present invention.
According to one specific embodiment of the present invention, the method involves at least flowing lactic acid into the part intended to receive disinfection treatment. Lactic acid may be used alone or in combination with other substances. According to one specific embodiment, the method involves flowing both an antibacterial agent for the disinfection and also an antifouling agent for the cleaning into the part intended to receive the disinfection and cleaning. Also in this case the antibacterial agent may be lactic acid. Furthermore, the flowing of the antibacterial agent and antifouling agent may be performed simultaneously or sequentially.
The substances intended to be used in the method according to the present invention have the advantage of being environmental friendly and biologically degradable to a large extent. As the disinfection and cleaning method according to the present invention is intended to be used in devices intended to save water and energy the aspect above is of great importance. The usage of environmental friendly and biologically degradable substances which has a very low negative impact on water and energy loss and use of chemicals is of course preferable in water recirculating systems, and in fact also in other systems where water is used and some amounts are wasted. Moreover, both lactic acid and citric acid, and also several enzyme or surfactant based substances are easy to use and inexpensive.
The device intended for method comprises a flow path for recycled water. Other units of the device are a fresh water inlet, a recirculation water inlet and a recirculation water outlet, a user outlet, a pump, sensors, valves, a heater and a filter. According to one specific embodiment of the present invention the method involves flowing lactic acid, citric acid and/or an enzyme based or surfactant based solution into at least part of the flow path for recycled water. One part of special interest for the method is the user outlet. In this part and the tubing in close proximity to the user outlet there is an evident risk for growth of bacteria and microorganisms. Therefore, this part is of special interest for the method according to the present invention.
According to yet another embodiment in line with this, the process order subsequent to the filter is the heater and then finally the user outlet and wherein flowing of lactic acid, citric acid and/or an enzyme based or surfactant based solution is performed into at least the user outlet of the device. Also in this case only lactic acid may be used, but also in combination with an enzyme based and/or surfactant based solution.
According to yet another embodiment, the flowing of lactic acid, citric acid and/or an enzyme or surfactant based solution is provided from the filter into the system and thus into all of the system arranged subsequent to the filter, also comprising the heater and the user outlet.
The provision of the substance(s) into the system may be provided by use of different means. According to one embodiment, a disposable filter unit is replaced with a cartridge containing the lactic acid, citric acid and/or an enzyme or surfactant based solution for allowing for performing the disinfection treatment. The cartridge is of course also a disposable to be used for the disinfection and cleaning of the system. The time point for performing the disinfection and cleaning may vary, but is intended to be performed at a decided time. This can be set by the system as such, e.g. when sensors are giving data to the processor that it is time for performing a disinfection and cleaning cycle. In such a case the system will inform a user that the method should be performed. Also a set certain use period (weeks, months) or a number of use cycles may be the parameters deciding when the method for disinfecting and cleaning should be performed.
As mentioned above, the method according to the present invention may be performed by use of a cartridge or cassette. According to yet another embodiment, the filter of the system is a disposable filter unit also comprising a dosing capsule containing lactic acid, citric acid and/or an enzyme or surfactant based solution and wherein the dosing capsule discharges the content when the filter is pressurized. The dosing of the lactic acid, citric acid and/or an enzyme or surfactant based solution may be performed during a time sequence in the beginning of usage of a new filter or may in fact be dosed based on a slow release technique so that the substance(s) are added continuously into the system at a suitable amount.
Another possible means for adding the substance(s) used in the method according to the present invention is dosage container. Therefore, according to one embodiment of the present invention, the lactic acid, citric acid and/or an enzyme or surfactant based solution is provided in a dosage container which content is poured into a drainage and thus into a recirculation loop to be flowed into the filter, the heater and the user outlet. Also in this case the substance(s) reached the user outlet and disinfects and cleans also this part. In this case, then the disinfection and cleaning is performed as a first cycle, such as during the first 10 minutes, when a new disposable filter unit is placed into the system.
As mentioned above, the water recirculating device may be of different type. Examples are showers, both domestically or at hotels or bathhouses, washing machines, or dish washers etc. According to one embodiment, the device intended for usage and recycling of water is a recirculating shower. As should be evident, when the disinfection and cleaning method is being performed, then regular use is not performed at the same time.
Detailed description of the drawings
In fig. 1 there is shown a water recirculating device, in this case a recirculating shower, in which the method according to one embodiment of the present invention may be used. As seen in fig. 1 , the device comprises a fresh water inlet, both cold and hot, the water flowed in here meets a recirculation loop comprising a recirculation water inlet, which in fact is one point along the loop before subsequent key units being a filter and then a heater. In the flow path up-streams, the user outlet is provided subsequently to the heater. As seen in fig. 1 there is arranged a drain being a point from which water is either wasted via the water recirculation outlet or sent to recirculation. As said above, to perform the method according to the present invention, the opening of valves (not shown) may be used. Moreover, sensors providing data to the processing unit and also a pump providing recirculating force are other units not shown in fig. 1 .
In fig. 2 there is shown a schematic view of the disinfecting (descaling) effect and cleaning effect when using lactic acid as the disinfecting agent and a surfactant as the cleaning agent according to the present invention.

Claims

Claims
1 . A method for disinfection and cleaning of at least one part of a device intended for recycling of water, said method involving flowing lactic acid, citric acid and/or an enzyme based or surfactant based solution into the part intended to receive the disinfection and cleaning.
2. The method according to claim 1 , wherein the method involves at least flowing lactic acid into the part intended to receive disinfection treatment.
3. The method according to claim 1 or 2, wherein the method involves flowing both an antibacterial agent for the disinfection and also an antifouling agent for the cleaning into the part intended to receive the disinfection and cleaning.
4. The method according to any of claims 1 -3, wherein the device comprises a flow path for recycled water, a fresh water inlet, a recirculation water inlet and a recirculation water outlet, a user outlet, a pump, sensors, valves, a heater and a filter and wherein the method involves flowing lactic acid, citric acid and/or an enzyme based or surfactant based solution into at least part of the flow path for recycled water.
5. The method according to claim 4, wherein the user outlet is one part being disinfected and cleaned.
6. The method according to any of claims 1 -5, wherein the device intended for usage and recycling of water is a recirculating shower.
7. The method according to claim 5 or 6, wherein the process order subsequent to the filter is the heater and then finally the user outlet and wherein flowing of lactic acid, citric acid and/or an enzyme based or surfactant based solution is performed into at least the user outlet of the device.
8. The method according to claim 7, wherein the flowing of lactic acid, citric acid and/or an enzyme based or surfactant based solution is provided from the filter into the system and thus into all of the system arranged subsequent to the filter, also comprising the heater and the user outlet.
9. The method according to claim 8, wherein a disposable filter unit is replaced with a cartridge containing the lactic acid, citric acid and/or an enzyme based or surfactant based solution for allowing for performing the disinfection treatment.
10. The method according to claim 8, wherein the filter is a disposable filter unit also comprising a dosing capsule containing lactic acid, citric acid and/or an enzyme based or surfactant based solution and wherein the dosing capsule discharges the content when the filter is pressurized.
1 1 . The method according to any of claims 4-7, wherein the lactic acid, citric acid and/or an enzyme based or surfactant based solution is provided in a dosage container which content is poured into a drainage and thus into a recirculation loop to be flowed into the filter, the heater and the user outlet.
PCT/SE2018/050610 2017-06-16 2018-06-12 A method for disinfection and cleaning of at least one part of a device intended for recycling of water Ceased WO2018231131A1 (en)

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EP3638861A4 (en) 2021-03-24
EP3638861A1 (en) 2020-04-22
EP3638861B1 (en) 2026-05-06
US20200101185A1 (en) 2020-04-02

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