WO2000054817A1 - Procede et dispositif de destruction des micro-organismes de systemes liquides - Google Patents

Procede et dispositif de destruction des micro-organismes de systemes liquides Download PDF

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Publication number
WO2000054817A1
WO2000054817A1 PCT/AU2000/000215 AU0000215W WO0054817A1 WO 2000054817 A1 WO2000054817 A1 WO 2000054817A1 AU 0000215 W AU0000215 W AU 0000215W WO 0054817 A1 WO0054817 A1 WO 0054817A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrical signal
micro
khz
wave form
electrodes
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/AU2000/000215
Other languages
English (en)
Inventor
Peter Carter
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.)
ENRAD HOLDINGS PTY Ltd
Original Assignee
ENRAD HOLDINGS PTY Ltd
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
Priority claimed from AUPQ4475A external-priority patent/AUPQ447599A0/en
Application filed by ENRAD HOLDINGS PTY Ltd filed Critical ENRAD HOLDINGS PTY Ltd
Priority to AU32621/00A priority Critical patent/AU3262100A/en
Publication of WO2000054817A1 publication Critical patent/WO2000054817A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • A61L2/02—Disinfection or sterilisation of materials or objects, in general; Accessories therefor using physical processes
    • 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
    • A61L2/02—Disinfection or sterilisation of materials or objects, in general; Accessories therefor using physical processes
    • A61L2/03—Electric current
    • A61L2/035—Electrolysis
    • 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
    • C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
    • 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
    • A61L2103/00—Materials or objects being the target of disinfection or sterilisation
    • A61L2103/05—Living organisms or biological materials
    • 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
    • C02F2303/04—Disinfection

Definitions

  • the present invention relates to a new method and apparatus for the treatment of liquid systems, and in particular to a new method and apparatus for removing harmful microorganisms from liquid systems without the use of chemical additives.
  • biofilm is a layer of organic matter that provides both a habitat and food supply for a wide range of bacteria and other micro-organisms.
  • Legionellabacteria rarely present a problem to humans, however, when the bacteria is inhaled by a person for example in tiny droplets of water produced from an infected air conditioning system, they can propagate and cause what is referred to as Legionnaires disease, particularly if the person concerned is ill or recovering from a serious medical procedure.
  • the bacterium Pseudomon ⁇ s ⁇ eriginos ⁇ causes significant infections in humans. People with cystic fibrosis, burn victims, individuals with cancer, and patients requiring extensive stays in intensive care are particularly at risk.
  • a further object of the invention is to provide a method and apparatus that targets specific micro-organisms that would ideally pose a threat to human life and well being.
  • micro-organisms can be eradicated by introducing a specific wave form into the liquid environment which breaks down the membrane components of the micro-organism necessary for it to survive.
  • an apparatus for destroying micro-organisms in a liquid system which includes: two electrodes in contact with the liquid system, a power source operatively coupled to the electrodes such that an electrical signal can pass between the electrodes through the liquid system thereby creating a circuit, wherein, the characteristics of the electrical signal are selected according to their ability to destroy a species of micro-organism.
  • characteristics include the shape of the wave form, current, frequency and/or duty cycle of said electrical signal
  • the wave form generated from said electrical signal is a triangular, square, sawtooth, delta, rectangular, sinusoidal and/or other shaped wave form.
  • the electrodes are chosen from materials such as for example precious metals including gold or silver.
  • the circuit created by the apparatus is reversible such that the polarity of the electrodes is interchangeable.
  • the apparatus also provides means for controlling the frequency and/or the current and/or the duty cycle of the electrical signal.
  • the frequency is internally or externally selectable from lKhz, 2 KHz, 4
  • the duty cycle is internally or externally selectable from 10% , 20% , 40%, 50%, 70% , 90% or 100%; and the cycle rate is internally or externally selectable and offers a choice of 5 seconds, 30 seconds, 5 minutes or 15 minutes.
  • the apparatus can be used in conjunction with a water system chosen from for example a swimming pool or a cooling tower.
  • the apparatus can be used in conjunction with one or more water purification or cleaning systems, chosen from for example a water filtration unit, an ionisation unit, membrane technology or chemical dosage.
  • a method for destroying micro-organisms in a liquid system which includes the steps of: applying an electrical signal across two electrodes in contact with the liquid system, wherein, the characteristics of the electrical signal are selected according to their ability to destroy a species of micro-organism.
  • Figure 1 illustrates a preferred embodiment of the present invention wherein the figure shows a schematic representation of the micro-organism removal apparatus.
  • Figure 2 illustrates a graphical representation of the wave form produced by varying the duty cycle of the electrical signal.
  • Figure 3 illustrates the same graphical representation as shown in figure 2, but showing the polarity revered between probes A and B.
  • Figure 4. illustrates graphically the results obtained according to example 1 from the initial influent post inoculum.
  • Figure 5. illustrates graphically the results obtained according to example 1 during the challenge.
  • Figure 6. illustrates a graphical representation of the wave form according to example 1.
  • Figure 7 - 14 illustrate several graphical representations of wave forms found to be effective against Pseudomonas aeriginosa and Legionella pneumophila.
  • FIG. 1 A preferred, but non-limiting embodiment of the present invention is shown in figure 1.
  • the metallic probes 2 of the apparatus 1 are immersed into the liquid 3 to be treated.
  • An electrical signal is applied to the probes 2.
  • the control unit 4 provides for current adjustment, frequency adjustment and duty cycle adjustment such that the wave form resulting from the electrical signal can be tailored to target a specific micro-organism presumed present in the liquid 3.
  • the polarity of the probes 2 is reversed at regular intervals to prevent premature degradation of the probes 2 from electrochemical corrosion.
  • the liquid 3 to be treated in accordance with the present invention can be chosen from any suitable liquid such as water, oil or sewage effluent dependent on the particular application.
  • the maximum Voltage (referred to as +Vmax in figures 2 and 3) in accordance with the present invention typically supplies between +30 V and +80 V but any +Vmax may be provided to suit a particular application.
  • the current typically provides up to 2 amperes through the fluid, but of course higher currents can be generated if required for specific applications involving liquids with varying conductivities.
  • Figures 2 and 3 show a typical square wave whose duty cycle is adjustable between 0% and 100% however any mathematical derived waveform may be used for different applications and for targeting specific micro-organisms in keeping with the ambit of the present invention.
  • the signal frequency in accordance with the present invention is nominally at 1000 Hz but may be varied from DC through to the frequency of UN light depending on the particular applications.
  • polarity reversal rate is chosen to suit the application for example if long continuous on periods are envisaged, polarity reversal may be several minutes but for short periods such as in domestic appliances, the reversal rate may be as low as 5 seconds.
  • An apparatus according to a preferred embodiment of the present invention was challenged with Legionella pneumophila serogroup 2-14.
  • Influent water was prepared to provide a suitable background of dissolved and suspended material.
  • the influent water was prepared as per AS/ ⁇ ZS 4348 (1995), concentrated 100 fold and diluted to operational consistency with tap water to provide a 20L volume of treatment.
  • a laboratory isolate of Legionella pneumophila serotype 2-14 was harvested from a pre-prepared lawn and suspended in sterile distilled water for later inoculation into the apparatus according to the present invention. Samples were taken of the initial influent post inoculum then after one hour reticulation with no current applied. See figure 4.
  • the probe Voltage will be negative or positive depending on the cycle when measured.
  • the initial inoculum approximated a million Legionella per millilitre.
  • An apparatus according to a preferred embodiment of the present invention was challenged with Pseudomonas aeruginosa strain ATCC 9027.
  • the reason this challenge organism was used is that according to microbiologists, it is one of the hardest to kill, meaning that if this can be eradicated, a broad range of bacteria will also be destroyed.
  • Influent water was prepared to provide a suitable background of dissolved and suspended material. The influent water was prepared as per AS/NZS 4348 (1995), concentrated 100 fold and diluted to operational consistency with tap water (i.e. 1:100).
  • the probe Voltage will be negative or positive depending on the cycle when measured.
  • Pseudomonad levels have shown an approximate one log reduction in 1 hour, and a 2 log reduction in 24 hours.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Epidemiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

La présente invention concerne un appareil (1) destiné à détruire les micro-organismes présents dans un système liquide (3). Cet appareil comporte, d'une part deux électrodes (2) qui sont en contact avec le système liquide (3), et d'autre part une source d'alimentation électrique (4) fonctionnellement couplée aux électrodes (2). Un signal électrique généré par la source d'alimentation électrique passe d'une électrode à l'autre (2) en traversant le système liquide (3), ce qui crée un circuit. Les caractéristiques du signal électrique sont sélectionnées en fonction de leur aptitude à détruire une espèce de micro-organismes.
PCT/AU2000/000215 1999-03-16 2000-03-16 Procede et dispositif de destruction des micro-organismes de systemes liquides Ceased WO2000054817A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU32621/00A AU3262100A (en) 1999-03-16 2000-03-16 Method and apparatus for destroying microorganisms in liquid systems

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AUPP009199 1999-03-16
AUPP9199 1999-03-16
AUPQ4475A AUPQ447599A0 (en) 1999-12-06 1999-12-06 Method and apparatus for the treatment of liquid systems
AUPQ4475 1999-12-06

Publications (1)

Publication Number Publication Date
WO2000054817A1 true WO2000054817A1 (fr) 2000-09-21

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ID=25645641

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2000/000215 Ceased WO2000054817A1 (fr) 1999-03-16 2000-03-16 Procede et dispositif de destruction des micro-organismes de systemes liquides

Country Status (1)

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WO (1) WO2000054817A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001055035A3 (fr) * 2000-01-24 2001-12-20 Rev22 Ag Dispositif pour traiter des eaux
WO2010113150A3 (fr) * 2009-03-30 2011-02-03 Yissum Research Development Company Of The Hebrew University Of Jerusalem, Ltd. Appareil, système et procédé pour empêcher la contamination biologique de matériaux pendant le stockage en utilisant une énergie électrique pulsée

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3233282A1 (de) * 1982-09-08 1984-03-08 Friedhelm Dr.-Ing. 5300 Bonn Caspers Keiminaktivierung ueber elektromagnetische hochfrequenzenergie
DE3341797A1 (de) * 1983-11-19 1985-05-30 Walter 4300 Essen Anke Verfahren und vorrichtung zur entkeimung einer fluessigkeitsmenge, insbesondere einer wassermenge
AU4273085A (en) * 1982-02-03 1985-09-19 Baremek Pty. Ltd. Electrophoretic cleaner and sterilizer
US5091152A (en) * 1988-05-19 1992-02-25 Thomas Sr Tim L Apparatus for electrically destroying targeted organisms in fluids
US5139684A (en) * 1990-08-06 1992-08-18 Steven Kaali Electrically conductive methods and systems for treatment of blood and other body fluids and/or synthetic fluids with electric forces
US5575974A (en) * 1993-05-12 1996-11-19 Wurzburger; Stephen R. Apparatus and method for an anodic oxidation biocidal treatment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU4273085A (en) * 1982-02-03 1985-09-19 Baremek Pty. Ltd. Electrophoretic cleaner and sterilizer
DE3233282A1 (de) * 1982-09-08 1984-03-08 Friedhelm Dr.-Ing. 5300 Bonn Caspers Keiminaktivierung ueber elektromagnetische hochfrequenzenergie
DE3341797A1 (de) * 1983-11-19 1985-05-30 Walter 4300 Essen Anke Verfahren und vorrichtung zur entkeimung einer fluessigkeitsmenge, insbesondere einer wassermenge
US5091152A (en) * 1988-05-19 1992-02-25 Thomas Sr Tim L Apparatus for electrically destroying targeted organisms in fluids
US5139684A (en) * 1990-08-06 1992-08-18 Steven Kaali Electrically conductive methods and systems for treatment of blood and other body fluids and/or synthetic fluids with electric forces
US5575974A (en) * 1993-05-12 1996-11-19 Wurzburger; Stephen R. Apparatus and method for an anodic oxidation biocidal treatment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001055035A3 (fr) * 2000-01-24 2001-12-20 Rev22 Ag Dispositif pour traiter des eaux
WO2010113150A3 (fr) * 2009-03-30 2011-02-03 Yissum Research Development Company Of The Hebrew University Of Jerusalem, Ltd. Appareil, système et procédé pour empêcher la contamination biologique de matériaux pendant le stockage en utilisant une énergie électrique pulsée

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