WO1990002707A1 - Water treatment system - Google Patents

Water treatment system Download PDF

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Publication number
WO1990002707A1
WO1990002707A1 PCT/GB1989/001045 GB8901045W WO9002707A1 WO 1990002707 A1 WO1990002707 A1 WO 1990002707A1 GB 8901045 W GB8901045 W GB 8901045W WO 9002707 A1 WO9002707 A1 WO 9002707A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
inlet
treatment system
conduit
cylinder
Prior art date
Application number
PCT/GB1989/001045
Other languages
French (fr)
Inventor
Maurice Edward George Maton
Original Assignee
Beaumont (Uk) Limited
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 Beaumont (Uk) Limited filed Critical Beaumont (Uk) Limited
Publication of WO1990002707A1 publication Critical patent/WO1990002707A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00—Domestic hot-water supply systems
    • F24D17/0073—Arrangements for preventing the occurrence or proliferation of microorganisms in 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
    • C02F1/02—Treatment of water, waste water, or sewage by heating

Definitions

  • This invention relates to a water treatment system and particularly a system for destroying Legionella micro-organisms when present in water.
  • the system is particularly, but not exclusively, for use in treating water used in hospitals, hotels or other establishments where the cold water storage and supply system and the hot water system are liable to contain Legionella micro- organisms.
  • known hot water cylinders and calorifiers used in water heating systems can, due to their design, produce regions of water which are at a temperature conducive to the breeding of Legionella micro-organisms.
  • Known hot water heating systems are constructed in a manner such that a high degree of temperature stratification is produced, with cold or very cold areas at the base of the heater or calorifier that can become particularly stagnant and very badly contaminated with Legionella micro-organisms and it is in this environment that Legionella micro-organisms are able to multiply rapidly.
  • Legionella micro-organisms can be destroyed by increasing the temperature of the water containing them and ensuring that the water does not have a static condition.
  • the temperature at which the life of the Legionella micro-organism is affected is 50°G but water at this temperature may take a month to kill all the Legionella micro-organisms in the water. It has been found that if the temperature of the water is at 20°C to 45°C, the Legionella micro-organisms will multiply rapidly, the optimum multiplication temperature being 35°C. At water temperatures of 50°C or thereabout, 90% of the Legionella micro-organisms in the water will be killed after about two hours.
  • the present invention provides a system in which water is maintained at a predetermined temperature for a predetermined period of time whilst continuing to flow so that Legionella micro-organisms are killed during the predetermined period of time.
  • a water treatment system comprising a water heater or water heaters for heating a supply of water to a predetermined temperature, means for supplying water to the water heater or water heaters, a water pasteurising device in communication with the water heater or water heaters for receiving water heated to said predetermined ' temperature in said water heater or water heaters, means for causing the heated water to flow through the pasteurising device for a predetermined period of time, and a water recirculation conduit system for receiving heated water from the pasteurising device.
  • the water pasteurising device comprises a container having a first inlet at its bottom end through which water to be treated is supplied, an outlet through which water received through said first inlet is supplied to said water heater, a second inlet through which water at said predetermined temperature is received from said water heater, and a second outlet at its upper end through which water at said predetermined temperature is supplied to said hot water recirculation conduit system, and a plurality of transversely extending baffles located between the second inlet and said second outlet, said baffles defining a flow path for the heated water flowing from the second inlet to said second outlet.
  • a deflector plate is provided within the container and located above the first inlet and which in use deflects the flow of water issuing from the first inlet.
  • the recirculation conduit system may communicate with* a cold water storage tank for treated water and/or a water cooling tower via a heat exchange device through which untreated water flows to the water heater.
  • Figure 1 is a diagrammatic circuit diagram of one embodiment of a water treatment system according to the present invention.
  • Figure 2 is a longitudinal section through one embodiment of a water pasteurising cylinder provided in the system of Figure 1;
  • Figure 3 is a transverse section through the water pasteurising cylinder of Figure 2;
  • Figure 4 is a longitudinal section through another embodiment of a water pasteurising cylinder which can be provided in the system of Figure 1;
  • Figure 5 is a transverse section taken along the line V-V indicated on Figure 4;
  • Figure 6 is a transverse section taken along the line VI-VI indicated on Figure 4.
  • Figure 7 is a diagrammatic circuit diagram of another embodiment of a water treatment system according to the present invention.
  • Figure 8 is a longitudinal section through yet another embodiment of a water pasteurising cylinder which can be provided in the system of Figure 7;
  • Figure 9 is a transverse section taken along the line IX-IX indicated on Figure 8.
  • Figure 10 is a transverse section taken along the line X-X indicated on Figure 9.
  • the water treatment system shown in Figure 1 comprises a water heater 10, which may be a gas or oil fired water heater, connected by conduits 11 and 12 to a water pasteurising cylinder 13, the conduit 11 being provided with a circulating pump ll_a.
  • the water pasteurising cylinder 13 is shown in greater detail in Figures 2 and 3 and has an inlet 14 at its bottom end which communicates with a supply conduit 15 which receives mains supply cold water from a water storage tank 16.
  • the cylinder 13 has an outlet 17 which communicates with the conduit 11, an inlet 18 which communicates with the conduit 12 and an outlet 19 at its upper end.
  • the cylinder 13 is provided with a plurality of horizontally disposed vertically spaced apart transversely extending baffle plates 20 which are mounted on brackets 21.
  • the baffle plates 20 define a tortuous flow path between the inlet 18 and the outlet 19.
  • a deflector plate 22 Located within the cylinder 13 is a deflector plate 22 which is spaced above the inlet 14 and supported on legs 23.
  • the outlet 19 is connected to a hot water recirculation conduit system 24 which has one or more controllable discharge outlets, such as hot water outlets 25 controlled by taps and shower outlets 26 controlled by a mixing valve.
  • the conduit system 24 is provided with a pump 27 and at is downstream end communicates with the supply conduit 15.
  • a by-pass recirculation conduit 28 is connected to the conduit 24 and the conduit 15 and is provided with a recirculation pump 29.
  • conduit 30 Connected with the conduit 24 is a conduit 30 which is connected with a cold water storage tank 31 and an evaporation type cooling tower 32. It will be appreciated that the cooling tower 32 may not be provided in certain installations.
  • the conduit 30 includes a heat exchanger device 33 through which water in the conduit 15 flows in heat exchange relationship with the water flowing through conduit 30 to cool the water flowing to the storage tank 31 and cooling tower 32. Also provided in the conduit 30 is a pump 34 whose operation is controlled by a device 35 which is sensitive to the level of water in the tank 31.
  • the cylinder 13 is provided with a man-hole 36 to facilitate inspection and maintenance and its outer side is covered by heat insulating material 37.
  • water from the mains is supplied to and stored in the tank 16 and water flows from the storage tank 16 into the supply conduit 15 and is passed through the heat exchanger device 33 and discharges through the inlet 14 into the cylinder 13 where it strikes the deflector plate 22, flows over the undersurface of the plate 22 and cascades from the periphery of the plate 22.
  • the water then flows out through the outlet 17 and into the conduit 11 where it is pumped by the pump 13 into the water heater 10.
  • the water heater 10 heats the water to a temperature of 55 to 60°G and the heated water passes through the conduit 12 to the inlet 18. From the inlet 18 the heated water flows along the flow path defined by the baffle plates 20 and thus takes a predetermined period of time to flow to the outlet 19.
  • the heated water then flows into the • conduit system 24 from which it is fed to the hot water outlets 25 and shower outlets 26 for use.
  • the heated water is circulated through the conduit system 24 and is pumped by the pump 27 back to the inlet 14 to the cylinder 13, via part of the conduit 15, from which it is conveyed back to the water heater 10.
  • conduit 30 Some of the heated water in conduit 24 flows into conduit 30 and is pumped by the pump 34 through the heat exchanger device 33 where it is cooled by giving up heat to the water in conduit 15 and flows to the cold water storage tank 31 and to the cooling tower 32.
  • Cold water from the tank 31 is conveyed through a cold water conduit 38 having controllable cold water outlets 39 and 40, the outlets 39 being controlled by the mixing valves of the showers and the outlets 39 being controlled by the taps.
  • FIGS. 4 to 6 show another embodiment of a water pasteurising cylinder 13 which can be used in the system of Figure 1 instead of the water pasteurising cylinder shown in Figures 2 and 3.
  • FIG 7 shows a water treatment system which comprises a plurality of water heaters 45 connected with a common recirculation and feed conduit 46, to which is connected a conduit 47 which is supplied with mains water from a cold water storage tank 48.
  • the conduit 46 is connected to an inlet 49 of a water pasteurising device 50 which is shown in greater detail in Figures 8 to 10.
  • the water pasteurising cylinder device 50 has an inlet conduit 51 which has its outlet portion directed vertically downwardly towards the base of the cylinder device 50.
  • the pasteurising cylinder device 50 is provided with a plurality of vertically spaced apart transversely extending baffle plates 52 which are mounted on brackets and define a tortuous flow path between the outlet of inlet conduit 51 and an outlet 53.
  • the outlet 53 is connected to a recirculation conduit system 54 which is provided with one or more controllable discharge outlets 55, such as hot water outlets controlled by taps and/or shower outlets controlled by mixing valves.
  • a by-pass conduit 56 is connected between the conduit 54 and the conduit 46 and is provided with ⁇ a recirculation pump 57.
  • a recirculation pump 58 is provided in the conduit system
  • Each water heater 44 is provided with a by-pass conduit 59 which includes a pump 60.
  • the water treatment system shown in Figure 7 can include a cold water conduit, heat exchanger device and treated cold water storage and/or water cooling tower such as described in connection with the embodiment of Figure 1.
  • the water from the storage tank 48 is heated in one or more of the water heaters 44 to a predetermined temperature, the number of water heaters 44 which are operational depending upon the demand, and the heated water flows into the pasteurising cylinder device 50 through the inlet conduit 51, flows along the flow path defined by the baffle plates 52 and out through the outlet 53 into the recirculation conduit system 54. The flow is returned to the water heaters 44. Water is also recirculated through the by-pass conduit 56.
  • the pasteurising cylinder device 50 is thermally insulated and is provided with a drain conduit 61 controlled by a valve (not shown). Thus water at a predetermined temperature is supplied to the pasteurising cylinder device 50 and is held for the predetermined length of time that it takes to flow from the inlet 49 to the outlet 53 and this is chosen such that any Legionella micro-organisms contained in the supply conduit 46 are destroyed.

Abstract

A water treatment system for destroying Legionella micro-organisms when present in water, comprises a water heater (10) or heaters (44) which heat the water to a predetermined temperature, a water pasteurising cylinder device (13, 50) in communication with the water heater (10) or heaters (44) for receiving water heated to the predetermined temperature in the heater (10) or heaters (44), baffle plates (20, 52) being provided in the pasteurising cylinder device (13, 50) for causing the heated water to take a predetermined period of time to flow through the pasteurising device (13, 50) to a water recirculation circuit (24, 54) which has means (25, 26, 55) for drawing off the water.

Description

WATER TREATMENT SYSTEM
This invention relates to a water treatment system and particularly a system for destroying Legionella micro-organisms when present in water. The system is particularly, but not exclusively, for use in treating water used in hospitals, hotels or other establishments where the cold water storage and supply system and the hot water system are liable to contain Legionella micro- organisms.
At present, known hot water cylinders and calorifiers used in water heating systems can, due to their design, produce regions of water which are at a temperature conducive to the breeding of Legionella micro-organisms. Known hot water heating systems are constructed in a manner such that a high degree of temperature stratification is produced, with cold or very cold areas at the base of the heater or calorifier that can become particularly stagnant and very badly contaminated with Legionella micro-organisms and it is in this environment that Legionella micro-organisms are able to multiply rapidly.
It has been found that Legionella micro-organisms can be destroyed by increasing the temperature of the water containing them and ensuring that the water does not have a static condition. The temperature at which the life of the Legionella micro-organism is affected is 50°G but water at this temperature may take a month to kill all the Legionella micro-organisms in the water. It has been found that if the temperature of the water is at 20°C to 45°C, the Legionella micro-organisms will multiply rapidly, the optimum multiplication temperature being 35°C. At water temperatures of 50°C or thereabout, 90% of the Legionella micro-organisms in the water will be killed after about two hours. At water temperatures of 60°C or thereabout, 90% of the Legionella micro-organisms in the water will be killed after about two minutes and at a water temperature of 70°C or thereabout, all of the Legionella micro¬ organisms in the water will be killed instantly. The present invention provides a system in which water is maintained at a predetermined temperature for a predetermined period of time whilst continuing to flow so that Legionella micro-organisms are killed during the predetermined period of time. According to the present invention there is provided a water treatment system comprising a water heater or water heaters for heating a supply of water to a predetermined temperature, means for supplying water to the water heater or water heaters, a water pasteurising device in communication with the water heater or water heaters for receiving water heated to said predetermined' temperature in said water heater or water heaters, means for causing the heated water to flow through the pasteurising device for a predetermined period of time, and a water recirculation conduit system for receiving heated water from the pasteurising device.
Preferably the water pasteurising device comprises a container having a first inlet at its bottom end through which water to be treated is supplied, an outlet through which water received through said first inlet is supplied to said water heater, a second inlet through which water at said predetermined temperature is received from said water heater, and a second outlet at its upper end through which water at said predetermined temperature is supplied to said hot water recirculation conduit system, and a plurality of transversely extending baffles located between the second inlet and said second outlet, said baffles defining a flow path for the heated water flowing from the second inlet to said second outlet.
Preferably a deflector plate is provided within the container and located above the first inlet and which in use deflects the flow of water issuing from the first inlet.
The recirculation conduit system may communicate with* a cold water storage tank for treated water and/or a water cooling tower via a heat exchange device through which untreated water flows to the water heater.
Some embodiments of the invention will now be described, by way of examples, with reference to the accompanying drawings, in which:-
Figure 1 is a diagrammatic circuit diagram of one embodiment of a water treatment system according to the present invention;
Figure 2 is a longitudinal section through one embodiment of a water pasteurising cylinder provided in the system of Figure 1;
Figure 3 is a transverse section through the water pasteurising cylinder of Figure 2;
Figure 4 is a longitudinal section through another embodiment of a water pasteurising cylinder which can be provided in the system of Figure 1;
Figure 5 is a transverse section taken along the line V-V indicated on Figure 4;
Figure 6 is a transverse section taken along the line VI-VI indicated on Figure 4;
Figure 7 is a diagrammatic circuit diagram of another embodiment of a water treatment system according to the present invention;
Figure 8 is a longitudinal section through yet another embodiment of a water pasteurising cylinder which can be provided in the system of Figure 7;
Figure 9 is a transverse section taken along the line IX-IX indicated on Figure 8; and
Figure 10 is a transverse section taken along the line X-X indicated on Figure 9.
The water treatment system shown in Figure 1 comprises a water heater 10, which may be a gas or oil fired water heater, connected by conduits 11 and 12 to a water pasteurising cylinder 13, the conduit 11 being provided with a circulating pump ll_a. The water pasteurising cylinder 13 is shown in greater detail in Figures 2 and 3 and has an inlet 14 at its bottom end which communicates with a supply conduit 15 which receives mains supply cold water from a water storage tank 16. The cylinder 13 has an outlet 17 which communicates with the conduit 11, an inlet 18 which communicates with the conduit 12 and an outlet 19 at its upper end. At its upper region the cylinder 13 is provided with a plurality of horizontally disposed vertically spaced apart transversely extending baffle plates 20 which are mounted on brackets 21. The baffle plates 20 define a tortuous flow path between the inlet 18 and the outlet 19.
Located within the cylinder 13 is a deflector plate 22 which is spaced above the inlet 14 and supported on legs 23.
The outlet 19 is connected to a hot water recirculation conduit system 24 which has one or more controllable discharge outlets, such as hot water outlets 25 controlled by taps and shower outlets 26 controlled by a mixing valve. The conduit system 24 is provided with a pump 27 and at is downstream end communicates with the supply conduit 15.
A by-pass recirculation conduit 28 is connected to the conduit 24 and the conduit 15 and is provided with a recirculation pump 29.
Connected with the conduit 24 is a conduit 30 which is connected with a cold water storage tank 31 and an evaporation type cooling tower 32. It will be appreciated that the cooling tower 32 may not be provided in certain installations.
The conduit 30 includes a heat exchanger device 33 through which water in the conduit 15 flows in heat exchange relationship with the water flowing through conduit 30 to cool the water flowing to the storage tank 31 and cooling tower 32. Also provided in the conduit 30 is a pump 34 whose operation is controlled by a device 35 which is sensitive to the level of water in the tank 31.
The cylinder 13 is provided with a man-hole 36 to facilitate inspection and maintenance and its outer side is covered by heat insulating material 37.
In use of the system water from the mains is supplied to and stored in the tank 16 and water flows from the storage tank 16 into the supply conduit 15 and is passed through the heat exchanger device 33 and discharges through the inlet 14 into the cylinder 13 where it strikes the deflector plate 22, flows over the undersurface of the plate 22 and cascades from the periphery of the plate 22. The water then flows out through the outlet 17 and into the conduit 11 where it is pumped by the pump 13 into the water heater 10. The water heater 10 heats the water to a temperature of 55 to 60°G and the heated water passes through the conduit 12 to the inlet 18. From the inlet 18 the heated water flows along the flow path defined by the baffle plates 20 and thus takes a predetermined period of time to flow to the outlet 19. The heated water then flows into the • conduit system 24 from which it is fed to the hot water outlets 25 and shower outlets 26 for use. The heated water is circulated through the conduit system 24 and is pumped by the pump 27 back to the inlet 14 to the cylinder 13, via part of the conduit 15, from which it is conveyed back to the water heater 10.
Some of the heated water in conduit 24 flows into conduit 30 and is pumped by the pump 34 through the heat exchanger device 33 where it is cooled by giving up heat to the water in conduit 15 and flows to the cold water storage tank 31 and to the cooling tower 32. Cold water from the tank 31 is conveyed through a cold water conduit 38 having controllable cold water outlets 39 and 40, the outlets 39 being controlled by the mixing valves of the showers and the outlets 39 being controlled by the taps.
Any Legionella micro-organisms contained in the tank 16 and supply conduit 15 are destroyed by heating the water in the water heater 10 and holding the water at a given temperature for a predetermined period of time in the pasteurising cylinder 13. Due to the high flow of water through the water treatment system there are no stagnant areas of water in which the Legionella micro-organisms can breed. Figures 4 to 6 show another embodiment of a water pasteurising cylinder 13 which can be used in the system of Figure 1 instead of the water pasteurising cylinder shown in Figures 2 and 3.
In Figures 4 to 6 parts which are similar to those shown in Figures 2 and 3 are indicated by the same reference numerals. In this embodiment cold water feed conduit 15 and recirculation conduit 24 are again connected to the inlet 14 and the flow into the cylinder 13 is through a conduit 41 whose outlet end is directed vertically downwardly towards the base of the cylinder 13. The inlets 18 which receive water heated by the water heater 10 are connected to conduits 42 which extend vertically downwardly towards the base of the cylinder 13. The conduits 42 are provided with vent holes 43 through which any air is vented into the cylinder 13. At its base' the cylinder 13 is provided with a drain conduit 44 controlled by a valve (not shown).
Figure 7 shows a water treatment system which comprises a plurality of water heaters 45 connected with a common recirculation and feed conduit 46, to which is connected a conduit 47 which is supplied with mains water from a cold water storage tank 48. The conduit 46 is connected to an inlet 49 of a water pasteurising device 50 which is shown in greater detail in Figures 8 to 10. The water pasteurising cylinder device 50 has an inlet conduit 51 which has its outlet portion directed vertically downwardly towards the base of the cylinder device 50. The pasteurising cylinder device 50 is provided with a plurality of vertically spaced apart transversely extending baffle plates 52 which are mounted on brackets and define a tortuous flow path between the outlet of inlet conduit 51 and an outlet 53.
The outlet 53 is connected to a recirculation conduit system 54 which is provided with one or more controllable discharge outlets 55, such as hot water outlets controlled by taps and/or shower outlets controlled by mixing valves. A by-pass conduit 56 is connected between the conduit 54 and the conduit 46 and is provided with^ a recirculation pump 57. A recirculation pump 58 is provided in the conduit system
54. Each water heater 44 is provided with a by-pass conduit 59 which includes a pump 60.
It will be appreciated that the water treatment system shown in Figure 7 can include a cold water conduit, heat exchanger device and treated cold water storage and/or water cooling tower such as described in connection with the embodiment of Figure 1.
In use of the system the water from the storage tank 48 is heated in one or more of the water heaters 44 to a predetermined temperature, the number of water heaters 44 which are operational depending upon the demand, and the heated water flows into the pasteurising cylinder device 50 through the inlet conduit 51, flows along the flow path defined by the baffle plates 52 and out through the outlet 53 into the recirculation conduit system 54. The flow is returned to the water heaters 44. Water is also recirculated through the by-pass conduit 56.
The pasteurising cylinder device 50 is thermally insulated and is provided with a drain conduit 61 controlled by a valve (not shown). Thus water at a predetermined temperature is supplied to the pasteurising cylinder device 50 and is held for the predetermined length of time that it takes to flow from the inlet 49 to the outlet 53 and this is chosen such that any Legionella micro-organisms contained in the supply conduit 46 are destroyed.

Claims

1. A water treatment system comprising a water heater (10) or water heaters (44) for heating a supply of water to a predetermined temperature, means (11, lla_, 15, 16; 46, 47, 48) for supplying water to the water heater (10) or water heaters (44), a water pasteurising device (13, 50) in communication with the water heater (10) or water heaters (44) for receiving water heated to said predetermined temperature in said water heater (10) or water heaters (44), means (20, 52) for causing the heated water to flow through the pasteurising device (13, 50) for a predetermined period of time, and a water recirculation conduit system (24, 54) for receiving heated water from the pasteurising device (13, 50).
2. A water treatment system as claimed in claim 1, in which the water recirculation conduit system (24, 54) is provided with on or more controllable discharge outlets (25, 26, 55).
3. A water treatment system as claimed in claim 1 or claim 2, in which the water recirculation conduit system (24, 54) is in communication with a treated water storage tank (31) and/or a water cooling tower (32) via a heat exchanger device ( 33 ) through which the water contained in said means (15, 16) is passed in heat exchange relationship with the water from the recirculation conduit system (24, 54).
4. A water treatment sy-stem as claimed in any preceding claim, in which the pasteurising device (13, 50) comprises a cylinder having an inlet (18, 49) for heated water, an outlet (19, 53) connected with the water recirculation conduit system (24, 54), and a plurality of transversely extending vertically spaced apart baffle plates (20, 52) defining a flow path between the inlet (18, 49) and the outlet (19, 53).
5. A water treatment system as claimed in claim 4, in which the pasteurising cylinder (13) has an inlet (14) connected to conduit means (15) through which water flows from a water storage tank (16) and an outlet (17) which is connected with the water heater (10).
6. A water treatment system as claimed in claim 5, in which a baffle plate (22) is disposed above the inlet (14) over which the incoming water cascades into the cylinder (13).
7. A water treatment system as claimed in claim 5, in which the inlet (14) is connected to an inlet conduit (41) whose discharge end is directed downwardly towards the base of the cylinder 13.
8. A water treatment system as claimed in claim 4, in which an inlet (49) for receiving water heated in said water heaters (44) is connected to an inlet conduit (51) whose discharge end is directed downwardly towards the base of the cylinder (50).
9. A water treatment system as claimed in any preceding claim, in which the pasteurising device (13, 50) is thermally insulated.
10. A water treatment system as claimed in claim 4 and any one of claims 6 to 9 when dependent upon claim 4, in which the baffle plates (20, 52) are supported on brackets from the wall of the cylinder.
PCT/GB1989/001045 1988-09-09 1989-09-06 Water treatment system WO1990002707A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8821232.9 1988-09-09
GB888821232A GB8821232D0 (en) 1988-09-09 1988-09-09 Water treatment system

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WO1990002707A1 true WO1990002707A1 (en) 1990-03-22

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WO (1) WO1990002707A1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0391508A2 (en) * 1989-04-06 1990-10-10 Joh. Vaillant GmbH u. Co. Utility water plant disinfecting process.
WO1991002935A1 (en) * 1989-08-24 1991-03-07 Neil Nicholas Improvements in disinfecting evaporative air conditioning plant
AT402287B (en) * 1994-12-02 1997-03-25 Gratz Michael Apparatus for the production and provision of hot water
US5772958A (en) * 1994-02-18 1998-06-30 Sander Hansen A/S Method and apparatus for the pasteurization of a continuous line of products
ES2186558A1 (en) * 2001-07-30 2003-05-01 Tapias Ricardo Lacasa Procedure and installation for the purification of cooling systems for air conditioner.
DE20320027U1 (en) * 2003-12-24 2004-07-08 Amtrol Nova Gmbh & Co. Kg Heat exchanger for hot water system has a double bottom connected to the hot water primary circuit and with an enhanced heat transfer to destroy legionnaires bacteria
NL1024796C2 (en) * 2003-11-17 2005-05-18 Kalsbeek Assen Holding B V A Water sterilization system for producing drinking water, e.g. on boats, has system for supplying hot sterilized water directly to tap point from hot water storage vessel
EP1637504A1 (en) * 2004-09-15 2006-03-22 Vertrieb und Grosshandel von Heizungs-, Sanitär- und Elektroerzeugnissen Device and method for heating and for thermal treatment of drinking water
EP2594856A3 (en) * 2011-11-16 2014-05-07 GEA TDS GmbH Method and assembly for discontinuous provision of heated water for use in a process for producing and/or treating a food item

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AU4914793A (en) * 1992-10-20 1994-05-05 Australian Warm Water Systems Pty. Ltd. Water treatment apparatus

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GB748407A (en) * 1953-02-16 1956-05-02 Thackray C F Ltd An improved apparatus for sterilising water in bulk
US3296122A (en) * 1963-04-02 1967-01-03 Worthington Corp Supply of fresh unpolluted water by means of pasteurization and sterilization of sewage effluent
DE3128359A1 (en) * 1980-07-22 1982-07-29 Rembert 6845 Hohenems Zortea Installation for water heating
DE3525990A1 (en) * 1985-07-20 1987-01-29 Buderus Ag Sanitary water heating tank
EP0270993A2 (en) * 1986-12-06 1988-06-15 Viessmann Werke GmbH & Co. Process for preventing the development and multiplication of harmful germs in the water of a sanitary hot water system, and applicances therefor
WO1989003807A1 (en) * 1987-10-23 1989-05-05 Joh. Vaillant Gmbh U. Co Prevention of the occurence or proliferation of microorganisms in water for industrial use

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB748407A (en) * 1953-02-16 1956-05-02 Thackray C F Ltd An improved apparatus for sterilising water in bulk
US3296122A (en) * 1963-04-02 1967-01-03 Worthington Corp Supply of fresh unpolluted water by means of pasteurization and sterilization of sewage effluent
DE3128359A1 (en) * 1980-07-22 1982-07-29 Rembert 6845 Hohenems Zortea Installation for water heating
DE3525990A1 (en) * 1985-07-20 1987-01-29 Buderus Ag Sanitary water heating tank
EP0270993A2 (en) * 1986-12-06 1988-06-15 Viessmann Werke GmbH & Co. Process for preventing the development and multiplication of harmful germs in the water of a sanitary hot water system, and applicances therefor
WO1989003807A1 (en) * 1987-10-23 1989-05-05 Joh. Vaillant Gmbh U. Co Prevention of the occurence or proliferation of microorganisms in water for industrial use

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0391508A2 (en) * 1989-04-06 1990-10-10 Joh. Vaillant GmbH u. Co. Utility water plant disinfecting process.
EP0391508A3 (en) * 1989-04-06 1991-01-16 Joh. Vaillant GmbH u. Co. Utility water plant disinfecting process.
WO1991002935A1 (en) * 1989-08-24 1991-03-07 Neil Nicholas Improvements in disinfecting evaporative air conditioning plant
US5772958A (en) * 1994-02-18 1998-06-30 Sander Hansen A/S Method and apparatus for the pasteurization of a continuous line of products
AT402287B (en) * 1994-12-02 1997-03-25 Gratz Michael Apparatus for the production and provision of hot water
ES2186558A1 (en) * 2001-07-30 2003-05-01 Tapias Ricardo Lacasa Procedure and installation for the purification of cooling systems for air conditioner.
NL1024796C2 (en) * 2003-11-17 2005-05-18 Kalsbeek Assen Holding B V A Water sterilization system for producing drinking water, e.g. on boats, has system for supplying hot sterilized water directly to tap point from hot water storage vessel
DE20320027U1 (en) * 2003-12-24 2004-07-08 Amtrol Nova Gmbh & Co. Kg Heat exchanger for hot water system has a double bottom connected to the hot water primary circuit and with an enhanced heat transfer to destroy legionnaires bacteria
EP1637504A1 (en) * 2004-09-15 2006-03-22 Vertrieb und Grosshandel von Heizungs-, Sanitär- und Elektroerzeugnissen Device and method for heating and for thermal treatment of drinking water
EP2594856A3 (en) * 2011-11-16 2014-05-07 GEA TDS GmbH Method and assembly for discontinuous provision of heated water for use in a process for producing and/or treating a food item

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GB8821232D0 (en) 1988-10-12
AU4225989A (en) 1990-04-02

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