WO2024074646A1 - Traitement solaire de milieux aqueux avec un photocatalyseur particulaire - Google Patents

Traitement solaire de milieux aqueux avec un photocatalyseur particulaire Download PDF

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Publication number
WO2024074646A1
WO2024074646A1 PCT/EP2023/077637 EP2023077637W WO2024074646A1 WO 2024074646 A1 WO2024074646 A1 WO 2024074646A1 EP 2023077637 W EP2023077637 W EP 2023077637W WO 2024074646 A1 WO2024074646 A1 WO 2024074646A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
photocatalyst
guidance
purifier system
water purifier
Prior art date
Application number
PCT/EP2023/077637
Other languages
English (en)
Inventor
Barbara Rossi
Raf DEWIL
Mohammadreza KAMALI
Original Assignee
Katholieke Universiteit Leuven
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 Katholieke Universiteit Leuven filed Critical Katholieke Universiteit Leuven
Publication of WO2024074646A1 publication Critical patent/WO2024074646A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • 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
    • C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
    • C02F1/685—Devices for dosing the additives
    • C02F1/687—Devices for dosing solid compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/305—Endocrine disruptive agents
    • 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
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/006—Cartridges
    • 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
    • C02F2303/18—Removal of treatment agents after treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/10—Photocatalysts

Definitions

  • the invention relates to photocatalysis based water purifying systems
  • a photoreactor with self-contained photocatalyst recapture is disclosed in US6,827,911. This type of reactor requires a specific configuration, photocatalyst with a specific buoyancy and specific flow rates of the water within the system to obtain the desired distribution of the photocatalyst in the device.
  • Present invention offers an improved system for generating safe drinking water by concentrated solar radiation on photocatalyst immobilized on harmless/inert porous supports comprised in the contaminated water.
  • Present invention relates to a method for decontaminating aqueous media such as water, and in particular drinking water that need a treat that is safe for human and non-human animals by irradiating concentrated light on said aqueous media and during the irradiation combined therein photocatalyst coupled with porous particles. More particularly, present invention concerns destruction or inactivation of microbial contaminants and chemical substance contaminants in an aqueous medium by transmitting harvested and concentrated solar radiation to aqueous medium comprising porous supports (e.g., chips, membranes, or spherical beads) coupled with photocatalyst.
  • the invention relates to a drinking water having at least one sieve, cartridge and conveyor for recovering and reusing particulate photocatalyst material from the purified water and guiding it to non-drinkable water to be treated.
  • the invention relates to such cartridges, sieves and conveyors that form part of a system for preparing safe drinking water.
  • An advantage such system can comprise a photovoltaic generated current source or coupled thereto so that it can be operated onfseiv remote places.
  • the photocata lytic material I supports e.g., chips, membranes, or spherical beads
  • the photocata lytic material I supports are automatically removed from the drinking water and easily or automatically replaced during operating in the water to be treated.
  • associated automatically collecting by systems water flow and moving it by a conveyor into new water to be treated is further advantageous.
  • This set up is so designed that the particulate photocata lytic material I supports will not remain I be introduced in the drinking water, which is a further advantage.
  • a water purifier system for converting non-drinkable aqueous fluid to drinkable water characterised in that purifier comprises 1) a light transparent absorber reservoir with water stream input and a water stream output, 2) a particulate photocatalyst cartridge holder having an outer wall defining an interior volume and at least one exit opening defining a particulate photocatalyst outlet that guides into the particulate photocatalyst inlet of a particulate photocatalyst conveyor with particulate photocatalyst outlet for supplying particulate photocatalyst to the water guidance that connects with the water input of a light transparent absorber reservoir to deliver water with particulate photocatalyst to the absorber reservoir, 3) a solar light reflector positioned to concentrate solar light onto absorber, 4) a sieve downstream of the liquid stream output of the absorber reservoir, the sieve having a mesh size that withhold the particulate photocatalyst and let pass water, whereby the sieve descend towards a part
  • the output funnel is a housing with therein the auger element with on axle member that is functionally connected by a coupling member of to a motor or motor unit to delivery measured portion of particulate photocatalyst to a target.
  • the water purifier system according to any one of the embodiments 4 to 6, characterised in that hopper assembly, comprises a sealable opening on top sealable by a lit
  • hopper assembly has a back wall, a front wall, a left side wall and a right sidewall that forms a lower funnel shaped portion on the hopper assembly.
  • particulate photocatalyst comprises porous substrate particles coupled with a photocatalyst.
  • particulate photocatalyst comprises porous chips, membranes or beads coupled with photocatalyst.
  • the water purifier system according to any one of the embodiments 1 to 13, further comprising a pump for pumping a stream non drinkable water through the light transparent absorber reservoir into a drinkable water reservoir.
  • a water purifier system for converting non-drinkable aqueous fluid to drinkable water characterized in that purifier comprises
  • a light transparent tubing with an input connecting to the first water guidance and an output, connecting to an optional second water guidance, wherein the reservoir, the first water guidance or the light transparent tubing, contains an additional inlet for receiving water with catalyst,
  • FIG. 1 is a photographic showing that untreated water is pumped through the light transparent tubing from the contaminated water unit (I) where porous chips or beads coupled with photocatalyst (in this set up chips) enter rom the photocata lytic substrate holding container, compartment (C) into the water flow guidance through connection (b) into the water flow guidance.
  • the chips coupled with photocatalyst were held in compartment (C) displayed in the top left of the unit which is photographically shown in the Fig. 1 b panel.
  • a guidance that comprises a push-pull solenoid guided the chips into the water stream. In this set up it was controlled via an PC.
  • the water and chip mix travelled through the light transparent tubing located in the focus of the parabolic trough (II) (also displayed in the Fig 1 B panel) where the photocatalysis occurs with concentrated sunlight light from the parabolic trough (II).
  • Treated water is pumped through the tubing into a filtering unit (III) with sieve (shown on photographic of Fig.l c panel (in top view of the filtering unit without sealing roof) where the chips were filtered out of the mix of water and chips.
  • the sieve compartment is easy to remove to refill compartment (C).
  • the Fig. 1 (B) panel is a photographic of the chips with photocatalyst.
  • FIG. 2 is a schematic graphic showing the experimental set up of examples 1 and 2
  • the same reference numbers in different drawings identify the same or similar elements. Also, the following detailed description does not limit the invention. Instead, the scope of the invention is defined by the appended claims and equivalents thereof.
  • first, second, third and the like in the description and in the claims are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein. Moreover, the terms top, bottom, over, under and the like in the description and the claims are used for descriptive purposes and not necessarily for describing relative positions. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other orientations than described or illustrated herein.
  • Reservoirs containing contaminant water and receiving pure water are for example, buckets, barrels or flexible bags.
  • the transparent tubing is immediately place at the outlet of the reservoir, whereby the water exiting the transparent may flow directly on the sieve.
  • the light transparent tubing has a water guidance at both ends for respectively connecting with the reservoir and direction the water to sieve.
  • First and second water guidance may be rigid as well as flexible. Depending on the place of entry of the particulate catalyst, the diameter should be large enough to allow the passage of particulate catalyst.
  • the light transparent tubing may of glass or plastic as long as it transparent or at least translucent to the wavelength of light used for photocatalysis.
  • the particulate catalyst is introduced via the third guidance in the system prior to where the reaction takes place in the light transparent tubing.
  • the particulate catalyst can be introduced in the reservoir with contaminated water, or at any place in the first water guidance or near the inlet of the light transparent tubing before the part of the guidance where the photocatalysis takes place.
  • a non-return valve is placed at the place of entry of the particulate catalyst, to prevent contaminated water entering the third guidance
  • the flow of the water through the system can be gravity driven, optionally with flow restrictor to reduce the water flow.
  • a pump transports the water through the system.
  • the system only requires one sieve to retain and collect the particulate catalyst. No additional sieves or needed between the reservoir and the outlet of the third guidance to restrict the movement of the particulate catalyst within a section of the system. This avoids a pressure built-up when catalyst or other solid particles would clog filters in a system.
  • Present invention relates to a method for decontaminating aqueous media such as water, and in particular drinking water that need a treat that is safe for human and non-human animals by irradiating concentrated light on said aqueous media and during the irradiation combined therein photocatalyst coupled with porous particles. More particularly, present invention concerns destruction or inactivation of microbial contaminants and chemical substance contaminants in an aqueous medium by transmitting harvested and concentrated solar radiation to aqueous medium comprising porous supports (e.g., chips, membranes, or spherical beads) coupled with photocatalyst.
  • porous supports e.g., chips, membranes, or spherical beads
  • the invention provides a way to decontaminate an aqueous fluid of microbial and/or chemical contaminants, in particular drinking water, while guaranteeing safety for the consumer.
  • an embodiment of present invention provides 1) at least one solar light harvester that concentrates and transmits the harvested concentrated light (1) 2) porous substrate/support, for instance microporous and/or macroporous particles, the substrate being coupled with a photocatalyst (2) and 3) a light transparent container to contain said the aqueous fluid with the substrate (3).
  • the object of the present invention of decontaminating is achieved by means of having the aqueous fluid with photocatalyst substrate (2) contained in the container (3) being functionally connected with the at least one light concentrator and concentrated light emitter (1).
  • Photocatalyst coupling to substrate can be achieved through covalent coupling to reactive groups on substrate surface on the outer surface and the interior pore surfaces or through functional groups connecting substrate and photocatalyst. Compared to devices such as disclosed in US6827911 the devices of the present invention have numerous advantages.
  • the devices of the present invention can be built with simple materials and broken parts can be easily replaced.
  • the present invention is predicated on the discovery by the inventors that when microbial and chemical contaminated water is pumped into a clear solid pipe with photocatalyst coupled to porous supports and is irradiated by highly concentrated solar light this leads to the total degradation or mineralization of pharmaceuticals through photocatalysis. Surprisingly this process was completed within minutes to produce safe drinkable water that is clean from pharmaceuticals. After porous supports are filtered out the water-support mix treated as such the treated water is drinkable. The filtered out supports are reusable.
  • a solar light concentrator concerns a set of concave reflectors (parabolic trough) that concentrate solar rays on a receiver container that is located in the focus.
  • such receiver container was a light transparent tubing where through the to be treated water was pumped and the photocatalyst porous beads were introduced.
  • the photocatalyst porous beads enter the water flow from a reservoir and the beads travelled through a software controlled push-pull solenoid.
  • the bead-water mix travelled through a transparent reactor where photocatalysis occurred.
  • the treated water was then pumped into another reservoir where the beads were filtered out of the mix, collected in a removable compartment to easily be reused by refilling the bead compartment.
  • Suitable for present invention are also comprises dish-shaped light collector or paraboloidal light collector and paraboloidal reflector with a concave reflective surface to concentrate collected light and optionally device for transmitting such high-density or concentrated light as the collected sunlight to the target, in present invention the target being a light transparent water container for photocata lytic treating of contaminated water.
  • Contaminated water with the compounds Carbamazepine (CBZ) and 17-o- Ethynylestradiol (EE2) is provided with ZnO photocatalyst coupled on porous chip form substrates is guided into a light transparent pipe and illuminated or irradiated with concentrated solar light.
  • the presence of the photocatalyst and concentrated solar light lead to degradation of contaminants within a few minutes to produce clean drinkable water.
  • a solar trough is used.
  • Contaminated water with the Carbamazepine (CBZ) and 17-o-Ethynylestradiol is provided with graphitic carbon nitride (g-C3N4) coupled porous chip form substrates and guided into a light transparent that is radiated by concentrated solar light from a sunlight illuminated solar trough.
  • g-C3N4 graphitic carbon nitride

Landscapes

  • 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)
  • Catalysts (AREA)
  • Physical Water Treatments (AREA)

Abstract

La présente invention concerne un purificateur d'eau pour convertir un fluide aqueux non potable en eau potable sûre. Le purificateur d'eau comprend un réservoir pour le fluide aqueux, un tube transparent à la lumière, un système de dosage pour fournir un photocatalyseur particulaire au fluide aqueux, un réflecteur de lumière solaire pour concentrer la lumière solaire vers le tube, un tamis en aval du tube pour retenir le photocatalyseur particulaire et laisser passer l'eau, de façon à récupérer le photocatalyseur particulaire dans une cartouche du système de dosage.
PCT/EP2023/077637 2022-10-05 2023-10-05 Traitement solaire de milieux aqueux avec un photocatalyseur particulaire WO2024074646A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP22199896 2022-10-05
EP22199896.6 2022-10-05

Publications (1)

Publication Number Publication Date
WO2024074646A1 true WO2024074646A1 (fr) 2024-04-11

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5174877A (en) * 1986-07-24 1992-12-29 Photo-Catalytics, Inc. Apparatus for photocatalytic treatment of liquids
EP0697012A1 (fr) * 1994-03-03 1996-02-21 Purifics Environmental Technologies, Inc. Procede et systeme de decontamination photocatalytique
GB2356859A (en) * 1999-07-21 2001-06-06 Procter & Gamble Combined photocatalytic and ultrasonic degradation of organic contaminants
US6827911B1 (en) 2000-11-08 2004-12-07 Bechtel Bwxt Idaho, Llc Photoreactor with self-contained photocatalyst recapture
CN108892200A (zh) * 2018-07-09 2018-11-27 北京高能时代环境技术股份有限公司 一种纳米光催化剂投加系统及方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5174877A (en) * 1986-07-24 1992-12-29 Photo-Catalytics, Inc. Apparatus for photocatalytic treatment of liquids
EP0697012A1 (fr) * 1994-03-03 1996-02-21 Purifics Environmental Technologies, Inc. Procede et systeme de decontamination photocatalytique
GB2356859A (en) * 1999-07-21 2001-06-06 Procter & Gamble Combined photocatalytic and ultrasonic degradation of organic contaminants
US6827911B1 (en) 2000-11-08 2004-12-07 Bechtel Bwxt Idaho, Llc Photoreactor with self-contained photocatalyst recapture
CN108892200A (zh) * 2018-07-09 2018-11-27 北京高能时代环境技术股份有限公司 一种纳米光催化剂投加系统及方法

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