WO2015133968A1 - Système, dispositif et procédé pour améliorer la qualité de l'eau - Google Patents

Système, dispositif et procédé pour améliorer la qualité de l'eau Download PDF

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Publication number
WO2015133968A1
WO2015133968A1 PCT/SE2015/050257 SE2015050257W WO2015133968A1 WO 2015133968 A1 WO2015133968 A1 WO 2015133968A1 SE 2015050257 W SE2015050257 W SE 2015050257W WO 2015133968 A1 WO2015133968 A1 WO 2015133968A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
radiation
control unit
water pipe
instructing data
Prior art date
Application number
PCT/SE2015/050257
Other languages
English (en)
Inventor
Tord Wingren
Lars Montelius
Kenneth M. PERSSON
Anders Ruland
Ola Hansson
Original Assignee
Watersprint Ab
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 Watersprint Ab filed Critical Watersprint Ab
Publication of WO2015133968A1 publication Critical patent/WO2015133968A1/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
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • C02F1/325—Irradiation devices or lamp constructions
    • 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
    • C02F2201/32—Details relating to UV-irradiation devices
    • C02F2201/322—Lamp arrangement
    • C02F2201/3222—Units using UV-light emitting diodes [LED]
    • 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
    • C02F2201/32—Details relating to UV-irradiation devices
    • C02F2201/326—Lamp control systems
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/005—Processes using a programmable logic controller [PLC]
    • C02F2209/008—Processes using a programmable logic controller [PLC] comprising telecommunication features, e.g. modems or antennas
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2307/00—Location of water treatment or water treatment device
    • C02F2307/06—Mounted on or being part of a faucet, shower handle or showerhead
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2307/00—Location of water treatment or water treatment device
    • C02F2307/10—Location of water treatment or water treatment device as part of a potable water dispenser, e.g. for use in homes or offices

Definitions

  • the disclosure relates to a system and a method for improving water, in particular tap water, quality.
  • Water is a life-sustaining drink to humans and is essential to the survival of most other organisms. Making water of acceptable quality widely available has contributed to major increases in life expectancy and improved public health. This has been achieved by introducing adequate infrastructure for water treatment and supply on massive scale. More specifically, raw water is treated in a water supply plant whereafter this treated, refined water, frequently referred to as tap water, is made available to the end users via a water distribution system. In countries with rigorous water quality regulation, the term tap water is interchangeable with the term potable water. Elsewhere, tap water should undergo further treatment prior to being consumed. Either way, the tap water remains susceptible to contamination, in particular to biological infection.
  • a system targeting alleviation of the situations of the above kind is disclosed in US20060207431 . More particularly, the disclosed system is used to detect fluid- borne pathogens and/or toxins and to treat the fluid carrying these. Accordingly, the system has at least one detector for detecting pathogens and/or toxins, a communications system associated with the detector, said system being in communication with a remote monitoring unit, and a treatment area for providing UV-light into the fluid containing said pathogens and/or toxins.
  • the disclosed system has limited functionality, in particular with respect to preemptive measures for preventing large-scale outbreaks.
  • the UV-light source is a laser unit emitting highly directional light.
  • One objective of the present invention is therefore to provide a system, a device for employment in the system as well as a method that address at least some of the shortcomings discussed above.
  • one aspect of the present invention provides a system for improving water, in particular tap water, quality the system comprising:
  • At least one device to be mounted on the water pipe belonging to the water distribution system, said at least one device being configured to collect
  • said at least one device further being configured to, by means of LEDs, emit UV-radiation into the water in the water pipe,
  • control unit being configured to receive collected information from said at least one device, process the received information in order to arrive at instructing data and to provide the instructing data to said at least one device so that said at least one device exposes the water in the water pipe to UV-radiation.
  • a method for improving water, in particular tap water, quality comprising:
  • a device for employment in the above system comprising:
  • the general idea embodied by the present system provides the end user with a solution that at least reduces its dependence on the public services. More specifically, the interaction between the mounted device and the control unit allows to, at any point in time and independently, ensure the quality of the water leaving the tap. This eliminates the risk of situations arising that may have severe societal effects as the one described above. In the same context, the extra safety measures aren't required, which simplifies the everyday life of the inhabitants.
  • the proposed system obviates the need for UV-treatment centrally in the water supply plants without compromising on the quality of the supplied water. This is beneficial as such apparatuses are rather costly. Moreover, the amounts of water passing through a water treatment plant necessitate for deployment of apparatuses comprising traditional UV-lamps for the purposes of UV-treatment. These lamps are effective, but are rather fragile and require significant
  • treating the tap water closer to the end user eliminates the risk of water being contaminated while being supplied via the water distribution system - there is a non-negligible risk of parasite occurrence in form of the biofilm on the inner walls of the water pipes, especially if the water distribution system previously has been contaminated.
  • the system at hand complements other, more widely available methods of water disinfection on industrial scale, i.e. treatment with some form of chlorine or its compounds, and contributes to achieving more comprehensive water disinfection.
  • Fig. 1 shows a flow chart of the method for improving water, in particular tap water, quality, according to one embodiment of the invention.
  • Fig. 2 is a schematical drawing that creates a context for a system well-suited for performing the method visualised in the flow chart of Fig. 1 .
  • Fig. 3 is a highly schematical drawing of a system of the present invention, situating said system in a broader value chain.
  • Fig. 4a and Fig. 4b are schematical views of the pipe- respectively faucet- mounted device according to embodiments of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • pipe is to be construed as encompassing fluid guides of different types of cross-sections, e.g. circular, rectangular and polygonal.
  • pipe-mounted system covers installation of the system on regular pipes with different diameters as well as on faucets.
  • a typical place of deployment of the inventive device is in conventional plumbing systems where it is used to ensure quality of tapped water.
  • water in the water pipe encompasses the water present in the water pipe as well as in the thereto associated, pipe-mounted device.
  • Fig. 1 shows a flow chart of the method for improving water, in particular tap water, quality, according to one embodiment of the invention. It is to be noted that the method steps of the claims do not have to take place in the above order for the method to be properly executed.
  • Fig. 2 is a schematical drawing that creates a context for a system 20 well-suited for performing the method visualised in the flow chart of Fig. 1 .
  • the system comprises at least one device 22 to be mounted on the water pipe belonging to the water distribution system.
  • the device is installed in a private home.
  • Each installed device is provided with a unique identity in order to be individually identifiable and addressable.
  • the device is configured to collect information on water in the water pipe and to emit UV-radiation into the water running in the water pipe. As an alternative, collected information could be partially/fully processed by the device. Said device will be more thoroughly discussed in conjunction with Figs. 4a and 4b.
  • the system further comprises a control unit 26 configured to receive the results obtained in said at least one device and process the received information in order to arrive at instructing data.
  • the instructing data is subsequently provided to said device so that it exposes the water in the water pipe to UV-radiation.
  • the system at hand complements other, more widely available methods of water disinfection on industrial scale, i.e. treatment with some form of chlorine or its compounds, and contributes to achieving more comprehensive water disinfection.
  • the present system provides the end user 35 with a solution that at least reduces its dependence on the public services. More specifically, the interaction between the mounted device and the control unit allows to, at any point in time and independently, ensure the quality of the water leaving the tap.
  • the proposed system eliminates the need for UV- treatment centrally in the water supply plants without compromising on the quality of the supplied water. Hence, the considerable investment associated with these apparatuses may be dispensed with. Moreover and as explained above, treating the tap water at the end user eliminates the risk of water being contaminated while being supplied via the water distribution system.
  • the emission of UV-radiation is initiated as soon as the device senses that there is water, typically but not limited to running water, in the water pipe and the UV-radiation proceeds until no water is present in the water pipe.
  • the relevant information to be collected is then whether there is water in the water pipe or not.
  • This scenario may be applied if the end user wants the solution offering maximum safety.
  • This information may be complemented by additional, external information on possible presence of the pathogens in water supply system, e.g. this additional information may originate from the water quality control performed at the water supply plant.
  • the emission of UV-radiation is initiated once measured quality of the water running in the water pipe drops below a preset value.
  • the system is further configured to take into consideration externally input data, such as manually input data, in order to arrive at instructing data.
  • the data is typically input via operator's working terminal 45 that also has means for viewing process information.
  • a system operator typically located at the control unit, in possession of reliable information not present in the system may enter it in the system in order to improve its performance. This is particularly useful in cases of large-scale contamination of water resources that haven't yet been detected by the pipe-mounted devices when immediate change of the dose of UV-radiation to be delivered by each device is necessary to prevent worsening of the quality of tap water.
  • the external data could be provided by a water treatment plant or an emergency service.
  • the inherent system design and the functionality of its components confer advantages when it comes to the responsiveness of the system. More specifically, if a number of devices, independently of each other, detect a sudden peak in levels of microorganisms present in the water, then this information will be relayed to the control unit without delay. The control unit will then process the received information and arrive at suitable instructing data that is instantaneously
  • the control unit also has an option of including further parameters while
  • the system may send the instructing data to all devices within this area.
  • This information possibly supplemented by the information as regards details of the local water distribution system will also facilitate the subsequent trouble-shooting efforts.
  • the control unit may, based on the obtained results, i.e. information received from the individual devices, assess the overall emergency level of the situation. This grading of the situation may for instance depend on the type of the detected microorganism. In any case, customized instructing data with respect to inter alia radiation intensity and wavelength, intended to prevent deterioration of the situation is provided to the individual devices.
  • control unit is further configured to, for each device, provide customized instructing data as regards at least one of intensity of emitted UV-radiation, direction of emitted UV-radiation and duration of a UV- radiation pulse.
  • the properties of the emitted UV-radiation may be adapted so as to match the type and the number of pathogens present in the water. This extends useful life of the LEDs and optimizes energy consumption.
  • the control unit may also use historically available data regarding epidemic outbreaks of pathogenic
  • the system may, based on the obtained results, generate predictions of the development of the situation. This information may be shared with other parties and/or used to prevent deterioration of the situation. In all of the above scenarios, the system is adaptive, meaning that it may draw on the past events in order to improve its performance.
  • the instructing data enables the device to expose the water in the water pipe to pulsed UV-radiation. This embodiment will be more thoroughly discussed in connection with Figs. 4a and 4b.
  • the control unit that normally is remotely located relative the device,
  • the communication happens using a connection that is available at a given moment.
  • the communication up to the internet gateway i.e.
  • Wi-Fi connection or a mobile communication network provided by the network operator.
  • Wi-Fi Zigbee or Z-wave could be used.
  • the control unit comprises a database configured to store data, the obtained results as well the instructing data, and is implemented on a server.
  • the control unit typically has a memory unit (not shown) and a processing unit (not shown).
  • the memory unit could be of the non-volatile kind.
  • a dedicated, executable computer program with computer instructions may be located in the memory unit.
  • the processing unit is configured to carry out the instructions of the computer program.
  • the computer program could be recorded on a carrier, typically a computer readable medium, prior to being loaded onto the memory unit. Alternatively, it could be preinstalled in said memory unit.
  • the disclosed embodiments of the method are performed when the computer programs are executed such that above-mentioned instructions are carried out by the suitably configured processing unit.
  • some of the above- described system functionality, here associated with the control unit could be provided by the device.
  • the system further includes a software application running on a portable communication device associated with the end user.
  • the application is configured to present various process data to the end user.
  • events of particular importance such as prohibitively elevated level of microorganisms in the water, could be communicated by the gateway sending a push notification to the user's portable communication device.
  • the built-in functionalities of the hardware using an iOS ® operative system are leveraged to improve methods of presentation of information to the end user.
  • this variant is, if suitably modified, applicable even when run on other operative systems for hand-held devices, such as AndroidTM.
  • the software application is native, i.e. it can interact with and take advantage of the
  • a system of the present invention could also be implemented using virtual hardware on a given hardware platform by employing a host software so as to create a simulated computer environment.
  • a host software so as to create a simulated computer environment.
  • Such an implementation offers a more flexible configuration and reduces the need for costly hardware resources.
  • the system is configured to be run in a cloud environment.
  • the system becomes easily scalable such that it can accommodate a large influx of new users.
  • the system may be moved to a new host with very short lead times and without affecting the end user.
  • Fig. 3 is a highly schematical drawing of a system of the present invention, situating said system in a broader value chain. More specifically, in addition to triggering an alarm in case of prohibitively high levels of pathogens in tap water, the system at hand is also intended to keep track of maintenance periods of the individual devices. In particular, the devices could, via suitable device parameters, alert the control unit that their performance has deteriorated. Based on that information, the control unit could propose overhaul respectively replacement of the device.
  • the system at hand may be owned and operated by the traditional water providers 55, the device itself could then be sold or leased to the end user and the control unit, comprising the database, is in that case also managed by the provider.
  • a typical implementation may be that an end user 35 has invested in a device for domestic use and has a water subscription provided by a commercial provider, which allows the user to be part of the provider's network and profits from its functionality as described above.
  • the system is managed by the traditional water provider then the information exchange with the water supply plant, typically also run by the water provider, is facilitated. This is equally true for other services owned by the water provider. Device overhaul and/or device replacement program(s) could then be part of the provider's business model. Alternatively, the system could be owned and managed by the municipality. On a smaller scale, a hospital or a school could also implement the system of the above-discussed kind. An alternative set-up could also be envisaged where the everyday operation of the system stays with the traditional water provider, for instance, whereas the systemic software updates, regarding the control unit as well as the devices, are handled by a third party 65, typically a private company.
  • This model could also entail that the third party aggregates and analyses process data in order to improve performance of the system.
  • This statistical data could also be used by the third party in order to add value e.g. by keeping track on water consumption of the individual households, identifying their consumption patterns and proposing customized water saving measures but also to detect water leakage and, in response thereto, issue an appropriate alert.
  • Fig. 4a and Fig. 4b are schematical views of the pipe- respectively faucet- mounted device according to embodiments of the present invention. More specifically, a device for mounting on the water pipe belonging to the water distribution system in order to improve water, in particular tap water, quality, is shown.
  • the device comprises means for collecting information on water in the water pipe, and at least one LED for emitting UV-radiation into the water in the water pipe.
  • the superior purpose of the device is to purify water flowing through a pipe (fluid direction indicated with an arrow) when mounted on a pipe/faucet of a
  • the device is connected to the pipe/faucet using means for mounting.
  • means for mounting may be realized in different ways.
  • a bayonet- or flange coupling may be used.
  • the engagement may be achieved by complementary threaded portions of the system and the pipe.
  • a suitable adapter could be installed onto the pipe prior to mounting of the system. More sensitive parts of the system are protected by a substantially cylindrically-shaped housing.
  • the amount of radiation dosing it is in a preferred embodiment determined based on several parameters and with a goal of achieving, in a fail-safe manner, adequate degree of
  • a flow meter (not shown) may be provided, preferably integrated with the device.
  • the flow meter could also be used to generate further relevant data, e.g. level of water leakage and/or total water consumption.
  • an indicator (not shown) is provided, said indicator preferably being integrated with the device.
  • the indicator undergoes a change easily perceivable by the user once the quality of the water running in the water pipe drops below a predetermined value.
  • This change may by way of example be signalled by visual or audio means. This feature is particularly useful when children are to be deterred from consuming the water that actually isn't potable.
  • the system visually indicates, e.g. by means of a suitably positioned lamp, when the pipe-mounted device emits UV-radiation. With respect to the same embodiment, said visual indication might undergo a change, e.g. colour of the lamp could shift when sufficient level of purification cannot be guaranteed.
  • tuneable diodes i.e. diodes emitting radiation of variable wavelength
  • a grating (not shown) that splits and diffracts light into several beams travelling in different directions may be provided on at least one of the LEDs.
  • the device is further provided with means for energizing (not shown) the LEDs. These means may be adapted to supply power from the electrical grid. As an alternative, in off-grid locations, these means may be embodied as photo-voltaic solar panels as well as fuel cell or battery units.
  • the LEDs could be embedded in a material acting as a heat sink and absorbing heat that develops while LEDs are emitting radiation.
  • the array of LEDs may be arranged in different patterns, such as helical or axially extending.
  • the device of this kind may incorporate substantially limitless number of LEDs. This also means that the total energy output from the set of LEDs may be very high. Consequently, a system capable of treating even extremely contaminated water may be obtained.
  • the LEDs may be configured for pulsing. This allows for operation at a duty cycle of less than 100% thereby allowing the LEDs to be operated above its maximum rated power for continuous operation. The overall power consumed is hereby reduced without performance deterioration. Hence, enhanced treatment capabilities per unit power consumed are achieved.
  • the device may comprise turbulence creating means according to yet another embodiment of the present invention.
  • said turbulence creating means are realized by providing the interior-facing surface of the device with ridges that disturb the laminar fluid flow.
  • dedicated baffles promoting turbulent flow may also be provided on said surface.
  • said surface may be provided with a photoactivated coating.
  • this coated surface may, when struck by light originating from LEDs, release free-radicals into the fluid flow. The released free radicals degrade bacteria present in the fluid.
  • a coating could provide a surface with hydro-affinity. The coated surface is then rendered either hydrophobic or hydrophilic.
  • the device comprises a particle filter.
  • the control unit may activate the particle filter so as to arrest the particles.
  • an alarm may also be issued in connection with detection of cloudy water.
  • the device emits pulsed UV-radiation.
  • the pulsing action is activated and controlled by the control unit.
  • This allows the LEDs to be operated at a duty cycle (the pulse width at a certain frequency) of less than 100% thereby allowing the LEDs to be operated at a value exceeding their maximum rated power whilst simultaneously reducing the overall power consumed.
  • the overall performance of the system is hereby improved.
  • the useful life of LEDs is significantly prolonged.
  • the use of a pulsed signal also improves the treatment efficiency significantly, because the harmonics produced during the transition points of the pulsed signal provide additional UV frequencies, which contribute to destruction of the microorganisms.
  • the device at hand is also suitable for retrofitting on the already installed water pipes. More specifically, only required steps are replacement of a section of the existing pipe commensurate with the length of the system and subsequent mounting of the system onto two pipe ends. The versatility of the system is hereby significantly increased.

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  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • 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)
  • Physical Water Treatments (AREA)

Abstract

L'invention concerne un système pour améliorer la qualité de l'eau, en particulier de l'eau de distribution. Le système comprend au moins un dispositif destiné à être installé sur la conduite d'eau appartenant au système de distribution d'eau, ledit dispositif étant configuré pour collecter des informations sur l'eau dans la conduite d'eau, et étant également configuré pour, au moyen de LED, émettre un rayonnement UV dans l'eau dans la conduite d'eau. Le système comprend en outre une unité de commande étant configurée pour recevoir les résultats obtenus dans ledit au moins un dispositif, traiter les informations reçues afin d'obtenir des données d'instruction pour fournir les données l'instruction audit au moins un dispositif de sorte que ledit au moins un dispositif expose l'eau dans la conduite d'eau à un rayonnement UV. L'invention concerne en outre un dispositif utilisable dans le système. L'invention concerne en outre un procédé pour améliorer la qualité de l'eau, en particulier de l'eau de distribution.
PCT/SE2015/050257 2014-03-07 2015-03-06 Système, dispositif et procédé pour améliorer la qualité de l'eau WO2015133968A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1450262-9 2014-03-07
SE1450262 2014-03-07

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Publication Number Publication Date
WO2015133968A1 true WO2015133968A1 (fr) 2015-09-11

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017140790A1 (fr) * 2016-02-18 2017-08-24 Philips Lighting Holding B.V. Système et procédé de purification de fluide
US10180248B2 (en) 2015-09-02 2019-01-15 ProPhotonix Limited LED lamp with sensing capabilities

Citations (6)

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Publication number Priority date Publication date Assignee Title
US20060207431A1 (en) 2000-12-22 2006-09-21 Baca A M Systems and methods for contaminant detection within a fluid, ultraviolet treatment and status notification
WO2007113537A1 (fr) * 2006-04-01 2007-10-11 P.W. Circuits Limited Appareil de traitement de fluide comprenant des diodes électroluminescentes à rayonnement ultraviolet
US20090250626A1 (en) * 2008-04-04 2009-10-08 Hexatech, Inc. Liquid sanitization device
DE102010047318A1 (de) * 2010-10-01 2012-04-05 Schott Ag UV-Halbleiterlichtquellen-Bestrahlungseinrichtung und deren Verwendung
US20120138545A1 (en) * 2010-12-07 2012-06-07 Soler Robert R LED Fluid Purification System and Method
WO2013162297A1 (fr) * 2012-04-27 2013-10-31 Seoul Opto Device Co., Ltd. Système de stérilisation utilisant une diode électroluminescente

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060207431A1 (en) 2000-12-22 2006-09-21 Baca A M Systems and methods for contaminant detection within a fluid, ultraviolet treatment and status notification
WO2007113537A1 (fr) * 2006-04-01 2007-10-11 P.W. Circuits Limited Appareil de traitement de fluide comprenant des diodes électroluminescentes à rayonnement ultraviolet
US20090250626A1 (en) * 2008-04-04 2009-10-08 Hexatech, Inc. Liquid sanitization device
DE102010047318A1 (de) * 2010-10-01 2012-04-05 Schott Ag UV-Halbleiterlichtquellen-Bestrahlungseinrichtung und deren Verwendung
US20120138545A1 (en) * 2010-12-07 2012-06-07 Soler Robert R LED Fluid Purification System and Method
WO2013162297A1 (fr) * 2012-04-27 2013-10-31 Seoul Opto Device Co., Ltd. Système de stérilisation utilisant une diode électroluminescente

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10180248B2 (en) 2015-09-02 2019-01-15 ProPhotonix Limited LED lamp with sensing capabilities
WO2017140790A1 (fr) * 2016-02-18 2017-08-24 Philips Lighting Holding B.V. Système et procédé de purification de fluide
CN108698857A (zh) * 2016-02-18 2018-10-23 飞利浦照明控股有限公司 流体净化系统和方法
US10815133B2 (en) 2016-02-18 2020-10-27 Signify Holding B.V. Fluid purification system and method
CN108698857B (zh) * 2016-02-18 2021-12-31 昕诺飞控股有限公司 流体净化系统和方法

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