WO2005056481A1 - Procede et dispositif de protection totale contre les legionnelles pour des installations de distribution d'eau - Google Patents

Procede et dispositif de protection totale contre les legionnelles pour des installations de distribution d'eau Download PDF

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Publication number
WO2005056481A1
WO2005056481A1 PCT/IT2004/000694 IT2004000694W WO2005056481A1 WO 2005056481 A1 WO2005056481 A1 WO 2005056481A1 IT 2004000694 W IT2004000694 W IT 2004000694W WO 2005056481 A1 WO2005056481 A1 WO 2005056481A1
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WO
WIPO (PCT)
Prior art keywords
water
hot water
cold water
sterile
sanitary
Prior art date
Application number
PCT/IT2004/000694
Other languages
English (en)
Inventor
Nicola Zonca
Massimo Zonca
Luca Zotti
Original Assignee
Zonca Studio Tecnico Associato
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 Zonca Studio Tecnico Associato filed Critical Zonca Studio Tecnico Associato
Publication of WO2005056481A1 publication Critical patent/WO2005056481A1/fr

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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
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • 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 method and a device for providing a full protection against Legionella in water delivery systems, in particular in hydro-sanitary systems according to the preambles of claims 1 and 4, respectively.
  • the Legionella Pneumophila bacterium is responsible for pathologies, such as pneumonia and infections to the respiratory system, which, sometimes, cause the death of the patient.
  • pathologies or diseases occur, in particular, in the presence of the following concomitant events: - a presence of Legionella in water
  • the main diffusion means are:
  • the above pathologies mainly affect the following persons: - hospitalized patients - hotel guests - the communities in general.
  • the treatments provided for hydro-sanitary systems mainly consist of: - chemical treatments (chlorine, ozone and so on) - UV radiation treatments - thermal treatments
  • the chemical treatments and UV radiation treatments do not provide an efficient protection against Legionella: - chlorine and other chemical treatments, which are performed in a discontinuous manner in order not to negatively affect water drinkableness, cause, in lacking disinfection periods, the development of novel Legionella colonies
  • the thermal treatment can be considered as an efficient method for neutralizing bacterial colonies, since it has been found that, at a temperature above 60°C, the bacterium dies in fractions of a second.
  • Prior system solutions provide at present: - a discontinuous thermal shock - a continuous thermal shock In both cases, temperature is increased above the bacterium neutralizing threshold. In the discontinuous case, this occurs only occasionally, and, accordingly, it is not possible to prevent novel colonies from forming in the periods from a treatment to a subsequent one.
  • the temperature of the recirculation loop is held at a 50°C, thereby providing, even if with a longer time for causing the bacterium to die, a water sterilization.
  • the latter system too does not provide a full protection and is affected by several problems since: - Legionella is made harmless only in the hot water recirculation and delivery pipes up to the draining point; in the end portions of the delivery pipes, water stagnates at temperatures suitable to cause a proliferation of the bacteric colonies;
  • the present invention sets out to overcome the above mentioned problems, by adopting, as an operating principle therefor, a neutralization by a continuous thermal shock, both of the sanitary hot or warm water and of the sanitary cold water.
  • the water systems will be supplied with a fully sterilized water and, even if water would stagnate at dangerous temperatures, the bacterium will be not able of proliferating since it would be devitalized.
  • the aim of the present invention is to provide a method, and a device for carrying out it, adapted to overcome the above drawbacks of the prior art, for providing a full protection against Legionella in water delivery or distribution systems.
  • the above aim is achieved by a method and device having the features of claims 1 and 4, respectively.
  • the basic teaching of the present invention comprises to perform a continuous thermal shock both of sanitary warm water and sanitary cold water.
  • the sanitary warm water system independently from its construction (accumulation kettle with a boiler supplied coil, for autonomously producing sanitary warm or hot water, heat exchanger for instantaneously providing sanitary warm or hot water and so on) will bring the inlet water temperature to a value greater than 70°C, or such as to assure an instantaneous death of the bacterium.
  • the warm water flow will be available for regular system delivery functions (such as a direct water delivery or, preferably, through a thermostatic mixture, for preventing burnings from occurring).
  • the cold water flow will be obtained by cooling the warm or hot water flow through a heat exchanger:
  • the already sterilized hot water flow will circulate. Since no contact is herein provided, the two water flows will not contaminate one another.
  • the heat exchanger will allow to cool the hot water flow, thereby providing a cold water flow for performing conventional system functions (such as a direct use or a thermostatic mixer use) and will allow to pre-heat the inlet unsterilized water, thereby recovering therefrom heat which, on the contrary, would represent a waste heat.
  • the power consume will not be larger than that which would be required for making sanitary hot or warm water.
  • the subject system provides a full protection, since no unsterilized water can arrive at the water delivery system.
  • the delivery system can be made by using conventional system making methods, by adopting temperatures less than legal limits, while preventing pipes from loosing their galvanized coating. Accordingly, the system will provide a full protection against Legionella in new systems, since it will sterilize all the water delivered the system itself.
  • the invention provides a lot of important advantages. Firstly, any active bacteric colonies are prevented from forming downstream of the subject protection system. With respect to a conventional hot water making system, is greatly reduced the additional power consume. The subject system, moreover, can be easily built-in in existing hydro-sanitary systems.
  • the subject system generally indicated by the letter A, comprises:
  • sanitary hot or warm water making system of any desired type (such as an accumulating kettle, with a boiler supplied coil, an autonomous sanitary hot water making device, a heat exchanger for instantaneously providing sanitary hot water and so on), which has been generally indicated by the letter B
  • the water system cold water, containing Legionella bacteria therein (as indicated at 1 ) is pre-heated through the primary side of the heat exchanger (reference number 2). Then, it is brought to a temperature larger than 65°C, by the sanitary hot water making system: thus, the present bacteria colony will be definitively neutralized.
  • the sterile or sterilized hot or warm water, thereby provided, can be either directly used or sent to the thermostatic mixer to provide a controlled temperature hot water delivery (see the reference number 4).
  • the sterilized or sterile hot or warm water (see the reference number 3) is supplied to the secondary side of the heat exchanger, where it will give heat to the primary side, while reducing its temperature to values slightly larger than the water system temperature.
  • sterile cold water will be available (reference number 6) to be directly used or to be sent to the thermostatic mixture. It would be also possible, if desired, to provide a water recirculation net or loop (reference number 5).

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)

Abstract

L'invention concerne un système de protection fondé sur l'utilisation d'un choc thermique continu haute température permettant de stériliser des bactéries Legionella, à la fois pour l'eau chaude et l'eau froide passant dans les sorties d'un système sanitaire d'eau. L'eau qui s'écoule est stérilisée grâce à l'augmentation de sa température au-dessus de 65 °C, ce qui entraîne une mort instantanée de la bactérie. Ainsi l'eau chaude qui s'écoule est disponible immédiatement et peut être utilisée dans un système de distribution d'eau classique (avec ou sans mélange thermostatique). L'eau froide qui s'écoule est produite par refroidissement de l'eau froide qui s'écoule, ce qui entraîne cette dernière à passer dans une partie secondaire d'un échangeur thermique, lequel présente une première partie traversée par l'eau froide entrée par le système, comprenant des légionelles et qui n'est pas stérilisée. Ainsi, en plus de l'eau stérilisée refroidie, la chaleur est récupérée, tout en éliminant les déchets.
PCT/IT2004/000694 2003-12-15 2004-12-15 Procede et dispositif de protection totale contre les legionnelles pour des installations de distribution d'eau WO2005056481A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITNO2003A000014 2003-12-15
ITNO20030014 ITNO20030014A1 (it) 2003-12-15 2003-12-15 Sistema di protezione totale antilegionella per impianti idrico-sanitari.

Publications (1)

Publication Number Publication Date
WO2005056481A1 true WO2005056481A1 (fr) 2005-06-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2004/000694 WO2005056481A1 (fr) 2003-12-15 2004-12-15 Procede et dispositif de protection totale contre les legionnelles pour des installations de distribution d'eau

Country Status (2)

Country Link
IT (1) ITNO20030014A1 (fr)
WO (1) WO2005056481A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011071369A1 (fr) 2009-12-11 2011-06-16 Hemme, Renerus Maria Dispositif d'alimentation en eau courante et procédé de lutte contre les pathogènes dans ledit dispositif
RU2493331C2 (ru) * 2011-02-10 2013-09-20 Овентроп Гмбх Унд Ко.Кг Система питьевой или технической воды
WO2018071956A1 (fr) * 2016-10-19 2018-04-26 Legioguard Pty Ltd Améliorations dans des systèmes de distribution d'eau chaude, tempérée et froide

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0594020A1 (fr) * 1992-10-17 1994-04-27 Werner Dipl.-Ing. Dünnleder Installation pour chauffer de l'eau sanitaire et pour tuer de la legionella dans cette eau sanitaire
EP1156013A1 (fr) * 2000-05-16 2001-11-21 Institut Francais Du Petrole Procédé continu de désinfection contre la légionellose dans les équipements à eau chaude sanitaire
SI21052A (sl) * 2001-10-12 2003-04-30 Virant Simon S.P. Naprava in postopek za pripravo pitne vode in ogrevanje

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0594020A1 (fr) * 1992-10-17 1994-04-27 Werner Dipl.-Ing. Dünnleder Installation pour chauffer de l'eau sanitaire et pour tuer de la legionella dans cette eau sanitaire
EP1156013A1 (fr) * 2000-05-16 2001-11-21 Institut Francais Du Petrole Procédé continu de désinfection contre la légionellose dans les équipements à eau chaude sanitaire
SI21052A (sl) * 2001-10-12 2003-04-30 Virant Simon S.P. Naprava in postopek za pripravo pitne vode in ogrevanje

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE EPODOC EUROPEAN PATENT OFFICE, THE HAGUE, NL; XP002326593 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011071369A1 (fr) 2009-12-11 2011-06-16 Hemme, Renerus Maria Dispositif d'alimentation en eau courante et procédé de lutte contre les pathogènes dans ledit dispositif
RU2493331C2 (ru) * 2011-02-10 2013-09-20 Овентроп Гмбх Унд Ко.Кг Система питьевой или технической воды
WO2018071956A1 (fr) * 2016-10-19 2018-04-26 Legioguard Pty Ltd Améliorations dans des systèmes de distribution d'eau chaude, tempérée et froide
EP3529537A4 (fr) * 2016-10-19 2020-04-22 LegioGuard Pty Ltd Améliorations dans des systèmes de distribution d'eau chaude, tempérée et froide
US11573012B2 (en) 2016-10-19 2023-02-07 Legioguard Pty Ltd Hot, tempered, and cold water delivery systems

Also Published As

Publication number Publication date
ITNO20030014A1 (it) 2005-06-16

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