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WO2007107741A1 - Système permettant de nettoyer une électrode - Google Patents

Système permettant de nettoyer une électrode Download PDF

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Publication number
WO2007107741A1
WO2007107741A1 PCT/GB2007/000981 GB2007000981W WO2007107741A1 WO 2007107741 A1 WO2007107741 A1 WO 2007107741A1 GB 2007000981 W GB2007000981 W GB 2007000981W WO 2007107741 A1 WO2007107741 A1 WO 2007107741A1
Authority
WO
WIPO (PCT)
Prior art keywords
cleaning
ion generator
cleaning system
acid
cleaning agent
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/GB2007/000981
Other languages
English (en)
Inventor
Christian J. Gauthier
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.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP07732073A priority Critical patent/EP2051939A1/fr
Publication of WO2007107741A1 publication Critical patent/WO2007107741A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/4606—Treatment of water, waste water, or sewage by electrochemical methods for producing oligodynamic substances to disinfect the water
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • C02F5/083—Mineral agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46119—Cleaning the electrodes
    • 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
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/4612—Controlling or monitoring
    • C02F2201/46145—Fluid flow

Definitions

  • the present invention relates to a cleaning system and cleaning process.
  • the present invention relates to a cleaning system and process for cleaning an internal surface of a system, which, in use, carries a fluid such as a liquid, in particular, water.
  • the present invention relates to a cleaning system and process for cleaning the surface of an electrode of an apparatus for introducing ions into a flow of water or a water supply, known in the art as an ion generator.
  • Legionnaires' disease is a type of pneumonia. It was named after an outbreak of severe pneumonia, which affected a convention of the American
  • Legionnaires in 1976 One of the most common species of bacteria, which causes Legionnaires disease is called Legionella pneumophila. People can contract Legionnaires disease by inhaling small droplets of water suspended in the air, which contain the legionella bacterium. This bacterium is widespread in nature and it mainly lives in water, for example, ponds, where it does not usually cause problems. Outbreaks of Legionnaires disease occur from purpose built water systems where temperatures are warm enough to encourage growth of the bacteria, e.g. in cooling towers, evaporative condensers and whirlpool spas, and from water used for domestic purposes in cruise ships and buildings such as hotels, hospitals, nursing homes and office buildings and the like. Other water borne bacteria can also cause infections, in particular, lung infections, such as pseudomonas bacteria.
  • Pontiac fever a flu-like illness caused by the bacterium Legionella pneumophila contracted by breathing mist that comes from a water source
  • Pontiac fever (such as air conditioning cooling towers, whirlpool spas, showers) contaminated with the bacteria.
  • the incubation period is short, from a few hours to 2 days, before the onset of fever and muscle aches. Persons with Pontiac fever do not have pneumonia. They generally recover in 2 to 5 days without treatment. Pontiac fever is so-named because of an outbreak in 1968 in Pontiac, Michigan. It is a milder form of legionellosis than Legionnaire disease which is caused by the same bacterium
  • Biofilm forms when bacteria adhere to surfaces in aqueous environments and begin to excrete a slimy, glue-like substance that can anchor them to all kinds of material - such as metals, plastics, soil particles, medical implant materials, and tissue.
  • a biofilm can be formed by a single bacterial species, but more often biofilms consist of many species of bacteria, as well as fungi, algae, protozoa, debris and corrosion products. Essentially, biofilm may form on any surface exposed to bacteria and some amount of water. Once anchored to a surface, biofilm microorganisms carry out a variety of detrimental or beneficial reactions (by human standards), depending on the surrounding environmental conditions.
  • ion generators generally include at least a pair of electrodes, for example, a pair of pure copper and/or sliver electrodes, or alloys thereof, which, in use, create positive metallic ions when a DC current is passed between such electrodes.
  • the resultant metallic ions for example, Cu 2+ and Ag + , are released from the positive electrode and are attracted to the other, negatively charged electrode.
  • the water flowing between the electrodes will carry the positive metallic ions away into the water system before they actually reach the opposite, negatively charged electrode.
  • positively charged ions for example, positively charged copper and silver ions travelling within the water supply system can bind themselves to negatively charged micro-organisms such as Legionella, or other micro-organisms present in the water system, which may be potentially harmful to health.
  • the positive metallic ions will instigate a multi-phase process, which will ultimately disrupt the overall cell metabolism of the micro-organism resulting in cell lysis, namely, cell death.
  • ion generators can suppress the growth of and/or eradicate micro-organisms from a water supply using safe levels of positive metallic ions they have generated; such levels being below the internationally prescribed guidelines for the level of metallic ions in water.
  • ion generators One of the problems associated with known water treatment systems of the type know in the art as ion generators is that the build-up of scale and other deposits originating from the water supply, such as biomass (sludge), greatly reduces the efficacy and efficiency of the ion generators.
  • the build-up of scale and other deposits, such as biofilm produces a physical barrier, producing a higher inter electrode resistance and making it more difficult to maintain a constant current between the electrodes and continue to introduce sufficient amounts of positive ions into the water supply to suppress the growth of and/or eradicate micro-organisms therefrom.
  • variable power supply a computer controlled variable voltage output power supply to maintain a constant current between the respective electrodes.
  • the use of a variable power supply will enable the ion generator to be effective even when there is a small accumulation of scale and other deposits. That is, a constant current sufficient to induce an effective amount of positive ions can be maintained by increasing the power supply to the electrodes.
  • the variable power supply is not sufficient to provide a constant current between the electrodes due to the extent of the build of scale and other deposits common to water supply systems, at which point, the ion generators need to be physically removed from the water supply system, which they serve, to be cleaned, physically and/or chemically.
  • the physical removal of the ion generators to be cleaned, and the acts of physically and/or chemically removing scale and other deposits from the electrode's surface are not only time consuming, but also expensive and involves manipulation of chemicals and/or cleaning tools such as scrubbing equipment.
  • a cleaning system for use in cleaning an electrode of an ion generator in situ, the system comprising: an isolator, which when actuated, isolates the ion generator from the fluid supply it is treating; and an inlet through which a cleaning agent can be dispensed into the ion generator such that the electrode of the ion generator is exposed to the cleaning agent.
  • the cleaning system of the present invention can be actuated at any given time to clean the electrode surfaces of an ion generator, the need of having to physically remove the ion generators from the water system and the disadvantages associated therewith are negated.
  • the present system on a regular basis, reduces the wear and tear of the ion generators in the sense that the power applied to the electrodes to generate sufficient levels of positive ions need not be varied as regularly as they are with prior art ion generators; the power levels of which need to be increased as the deposit accumulates.
  • the isolator includes at least two valves, one located at either side of the ion generator.
  • the cleaning system further includes at least one reservoir which stores the cleaning agent, which is preferably in liquid form.
  • the reservoir may be an integral part of the system, or may be portable such that it can be attached to the system as and when the need arises.
  • the cleaning system further includes at least one pump for dispensing the cleaning agent, which is in liquid form, through the inlet.
  • the cleaning agent may be a weak acid, like an organic acid, preferably selected from the group consisting of acetic acid (CH3COOH) or benzoic acid (C 6 H 5 COOH).
  • the cleaning agent may be an inorganic acid such as Muriatic acid or hydrochloric acid (HCI), or a surfactant that can greatly reduce the surface tension of water when used in very low concentrations for the removal of organic based deposits.
  • Bio-Enzymes suspended in liquid solutions can also be used as cleaning agent.
  • the organic acid is weak in nature, and is capable of removing inorganic deposits such as scale (CaCO 3 deposits) when used on a regular basis.
  • the acid is an organic acid, such as acetic acid or benzoic acid. This has the advantage in that being an organic acid its eventual degradation is environmentally friendly, less corrosive, and moreover, can be safely disposed of subsequent to use without any further treatment and can be let back into the environment. As will be appreciated, this certainly reduces the cost and the safety of cleaning systems of this type, and moreover, makes them environmentally more friendly.
  • the liquid surfactant solution for biofilm (sludge) dispersant should contain but not limited to: sodium acrylate-silicate ester, acrylate- silicate ester, sodium 2-ethyIhexyl sulphate (C 8 Hi 7 NaSO 4 ) and/or sodium dimethylbenzene sulfonate in various concentrations based on the particular cleaning requirements.
  • the system further includes a detector for detecting that the isolator has isolated the ion generator from the fluid supply it is treating.
  • the detector includes a flow meter or flow switch.
  • a flow switch measures or detects fluid or water movement
  • a flow meter can, in addition to detecting movement, can measure the flow volume of the liquid or fluid.
  • both the flow switch and flow meter transmit either a digital and/or an analogue signal to the ion generator computer system.
  • the cleaning system further includes an outlet through which the system can be drained independently.
  • This has the advantage in that the system can be drained without causing cross contamination with the main water distribution system, which is being treated by the ion generator.
  • the outlet is associated with a detector for detecting the flow of fluid to the outlet.
  • the detector is a flow switch or a flow meter as identified above.
  • the cleaning system further includes a second inlet port through which air can be introduced into or escape from the ion generator. This enables air into the system such that it may be drained.
  • the inlet includes a valve, which, when actuated, allows air to be introduced or evacuated and avoid differential pressures that could cause liquid flow problems.
  • the cleaning system further includes a rinser, which when actuated, introduces water into the isolated ion generator such that any cleaning agent can be rinsed from the isolated ion generator.
  • the rinser includes at least one valve for introducing rinsing fluid into the ion generator. Further preferably, the valve diverts the flow of the water to be treated into the ion generator.
  • the cleaning system is fully automated, preferably by the use of a computer or computerised system. This has the advantage that the whole cleaning cycle can be carried out without any human intervention or involvement.
  • an ion generator in communication with a cleaning system of the present invention.
  • a cleaning system in accordance with the present invention to clean an ion generator.
  • a method for cleaning the electrode of an ion generator in situ utilising the cleaning system of the present invention comprising the steps of: actuating the isolator such that the fluid or water to be treated no longer flows through the ion generator; draining the ion generator; and introducing at least one cleaning agent through the inlet, such that the electrodes of the ion generator are exposed to the cleaning agent.
  • the method further includes the steps of: draining the at least one cleaning agent through the outlet.
  • the method further includes the step of rinsing the surfaces of the electrodes, before the ion generator is exposed to the primary fluid supply to be treated.
  • the method is fully automated.
  • Figure 1 illustrates a schematic diagram of a cleaning system of the present invention in communication with an ion generator.
  • a cleaning system (10) in accordance with the present invention is associated with two ion generators (11), in particular two flow cells which include the electrodes, which may be of the type obtainable from ProCare Water Treatment lnc located within a flow of water to be treated.
  • the cleaning system is associated with a plurality of flow cells (11), it is to be appreciated that it may be associated with one flow cell or more than a plurality of flow cells connected in series or in parallel, or combinations thereof.
  • the first valve (V1) When the ion generators (11) are in normal use, i.e. in treatment mode, the first valve (V1) is closed such that the water to be treated can flow through a second valve (V2) thereby passing between the ion producing electrodes provided within the ion generators (11), past the first flow monitor (FM1) and through the third valve (V3) to a suitable outlet (20) through which the treated water can be dispensed for use, such as a tap.
  • the first valve (V1) In the event that the electrodes within the ion generators (11) are scheduled to be cleaned, the first valve (V1) is opened such that the main pipe flow detectors (FM1) and the second flow detector (FM2) record and show the flow of water in the respective pipes or conduits with which they are associated.
  • the second valve (V2) and the third valve (V3) are closed.
  • the first flow monitor (FM 1) will, indicate or read that there is no flow of liquid in the pipe with which it is associated.
  • the liquid or water within the ion generators (11) is subsequently drained by the combined opening of the fifth valve (V5), which lets in air and the fourth valve (V4), which leads to a drain (40).
  • the sixth valve (V6) is then opened, at which point a cleaning agent, for example, acetic acid stored within a suitable reservoir (31) is pumped by pump (30) from the reservoir through an inlet (50) such that the space between the electrodes present within the ion generators (11) is filled up with the cleaning agent.
  • a cleaning agent for example, acetic acid stored within a suitable reservoir (31)
  • the sixth valve (V6) is closed, that is, subsequent to the pump (30) associated with the inlet (50) being deactivated or de-actuated.
  • the cleaning agent is left within the system for a time period required in relation to the time elapsed since the last similar recorded cleaning cycle, size of the system, the type of cleaning agent and concentration used to accomplish the particular cleaning task.
  • the fourth valve (V4) is then reopened such that the cleaning agent to which the surfaces of the electrodes within the ion generators (11) has been exposed can be disposed of, or drained from the ion generators via drain outlet (40).
  • the "cleaning cycle" can be repeated, but this time using a different cleaning agent, that is, to remove a different type of deposit from the surface of the electrodes within the ion generators.
  • the fifth valve (V5) is closed, and the third valve (V3) is re-opened such that water may pass through the third valve (V3) down into the ion generators (11), thereby cleaning or rinsing the electrode surfaces of the ion generators (11).
  • the rinsing water will pass out through the fourth valve (V4) via the drain outlet (40).
  • the fourth valve (V4) is closed, and second valve (V2) is re-opened, and finally, the first valve (V1) is closed such that the water from the water supply or reservoir to be treated passes directly and solely through the ion generators (11), the electrode surfaces of which have been cleaned.
  • the ion generators (11) would need to be removed from the water supply system, such that the surfaces of the electrodes present on their internal surfaces can be suitably cleaned to remove scale and other deposits common to-,the water supply, which had built up over time.
  • the cleaning system of the present invention has been described for use in cleaning an ion generator, namely, the flow cells thereof which included the electrodes, it is to be understood that the cleaning system can be used to clean any internal surface, for example, the interior surface of a pipe, within a fluid carrying system.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

Cette invention concerne un système de nettoyage (10) pouvant être utilisé pour nettoyer une électrode d'un générateur d'ions (11) in situ. Le système susmentionné comprend un isolateur (V2,V3) qui, lorsqu'il est actionné, isole le générateur d'ions (11) de l'alimentation fluide qu'il est en train de traiter; et un orifice d'amenée (50) à travers lequel un agent de nettoyage peut être introduit dans le générateur d'ions (11) de telle sorte que l'électrode du générateur d'ions (11) est exposée à l'agent de nettoyage.
PCT/GB2007/000981 2006-03-20 2007-03-20 Système permettant de nettoyer une électrode Ceased WO2007107741A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07732073A EP2051939A1 (fr) 2006-03-20 2007-03-20 Système permettant de nettoyer une électrode

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0605546.1 2006-03-20
GB0605546A GB2436330A (en) 2006-03-20 2006-03-20 A cleaning system for an electrode

Publications (1)

Publication Number Publication Date
WO2007107741A1 true WO2007107741A1 (fr) 2007-09-27

Family

ID=36293086

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2007/000981 Ceased WO2007107741A1 (fr) 2006-03-20 2007-03-20 Système permettant de nettoyer une électrode

Country Status (3)

Country Link
EP (1) EP2051939A1 (fr)
GB (1) GB2436330A (fr)
WO (1) WO2007107741A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12110239B2 (en) 2021-06-18 2024-10-08 Robin J. Wagner Water management system
US11964886B2 (en) * 2021-06-18 2024-04-23 Robin J. Wagner Water management system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998013304A1 (fr) * 1996-09-27 1998-04-02 Enigma (Uk) Limited Traitement electrochimique d'un liquide tel que l'eau
US6126820A (en) * 1998-11-24 2000-10-03 Liquitech, Inc. Apparatus for purifying liquids
EP1108683A2 (fr) * 1999-12-14 2001-06-20 Sanyo Electric Co., Ltd. Dispositif de traitement de l eau
EP1382573A1 (fr) * 2002-07-09 2004-01-21 Hartmut Rebscher Dispositif de nettoyage automatique d'une cellule d'un réacteur d'une installation de traitement de l'eau

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GB2113718B (en) * 1982-01-26 1985-09-04 Imi Marston Ltd Electrolytic cell
US5543040A (en) * 1994-12-12 1996-08-06 Fi-Tek Purification Systems, Inc. Apparatus for purification of water-based fluids in closed-loop flow systems
JP2000037691A (ja) * 1998-07-23 2000-02-08 Toto Ltd 電解水生成装置
JP4553449B2 (ja) * 2000-05-23 2010-09-29 コロナ工業株式会社 電解イオン水生成装置の洗浄方法
FR2844783B1 (fr) * 2002-05-07 2008-05-30 Patrice Guy Noel Combe Installation pour l'assainissement d'eau dont la frequence et la duree de fonctionnement sont reglables par un simple utilisateur
AU2003902540A0 (en) * 2003-05-23 2003-06-05 Watertech Services International Pty Ltd A swimming pool cleaning and sanitising system
HRP20030605A2 (en) * 2003-07-25 2005-04-30 Lambaša Romeo Agent, appliance and process for removing scale

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998013304A1 (fr) * 1996-09-27 1998-04-02 Enigma (Uk) Limited Traitement electrochimique d'un liquide tel que l'eau
US6126820A (en) * 1998-11-24 2000-10-03 Liquitech, Inc. Apparatus for purifying liquids
EP1108683A2 (fr) * 1999-12-14 2001-06-20 Sanyo Electric Co., Ltd. Dispositif de traitement de l eau
EP1382573A1 (fr) * 2002-07-09 2004-01-21 Hartmut Rebscher Dispositif de nettoyage automatique d'une cellule d'un réacteur d'une installation de traitement de l'eau

Also Published As

Publication number Publication date
EP2051939A1 (fr) 2009-04-29
GB0605546D0 (en) 2006-04-26
GB2436330A (en) 2007-09-26

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