WO2018146692A1 - Procédé et système de traitement de masse d'eau - Google Patents

Procédé et système de traitement de masse d'eau Download PDF

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Publication number
WO2018146692A1
WO2018146692A1 PCT/IL2018/050168 IL2018050168W WO2018146692A1 WO 2018146692 A1 WO2018146692 A1 WO 2018146692A1 IL 2018050168 W IL2018050168 W IL 2018050168W WO 2018146692 A1 WO2018146692 A1 WO 2018146692A1
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WO
WIPO (PCT)
Prior art keywords
gas
water
enclosure
oxygen
water body
Prior art date
Application number
PCT/IL2018/050168
Other languages
English (en)
Inventor
Ronen-Itzhak Shechter
Noam Mordechai SIEGEL
Original Assignee
Fluence Water Products And Innovation Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fluence Water Products And Innovation Ltd filed Critical Fluence Water Products And Innovation Ltd
Publication of WO2018146692A1 publication Critical patent/WO2018146692A1/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
    • C02F7/00—Aeration of stretches of water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2311—Mounting the bubbling devices or the diffusers
    • B01F23/23113—Mounting the bubbling devices or the diffusers characterised by the disposition of the bubbling elements in particular configurations, patterns or arrays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2311—Mounting the bubbling devices or the diffusers
    • B01F23/23115—Mounting the bubbling devices or the diffusers characterised by the way in which the bubbling devices are mounted within the receptacle
    • B01F23/231151—Mounting the bubbling devices or the diffusers characterised by the way in which the bubbling devices are mounted within the receptacle the bubbling devices being fixed or anchored in the bottom
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23124—Diffusers consisting of flexible porous or perforated material, e.g. fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23124—Diffusers consisting of flexible porous or perforated material, e.g. fabric
    • B01F23/231244—Dissolving, hollow fiber membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23126—Diffusers characterised by the shape of the diffuser element
    • B01F23/231264—Diffusers characterised by the shape of the diffuser element being in the form of plates, flat beams, flat membranes or films
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B1/00—Equipment or apparatus for, or methods of, general hydraulic engineering, e.g. protection of constructions against ice-strains
    • E02B1/003—Mechanically induced gas or liquid streams in seas, lakes or water-courses for forming weirs or breakwaters; making or keeping water surfaces free from ice, aerating or circulating water, e.g. screens of air-bubbles against sludge formation or salt water entry, pump-assisted water circulation
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/008—Mobile apparatus and plants, e.g. mounted on a vehicle
    • 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
    • C02F2303/06—Sludge reduction, e.g. by lysis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/20—Activated sludge processes using diffusers
    • C02F3/208—Membrane aeration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the present disclosure concerns a method and system for cleaning bodies of water, such as lakes, rivers, ponds, canals.
  • Means to deal with polluted water may include, for example, removal and disposal of sludge from the bottom of water bodies by mechanical excavation or treatment of such removed sludge at external sites.
  • WO 2011/073977 describes a system for treating wastewater including a water- treatment pathway having an inlet, an oxygen-permeable, water-impermeable wall, separating an interior of the pathway from outside air, and a treated wastewater outlet and arranged for at least aerobic treatment of the wastewater as it flows from the wastewater inlet to the treated wastewater outlet, wastewater supply conduit, supplying the wastewater to the wastewater inlet of the water-treatment pathway and a treated wastewater conduit, supplying treated wastewater from the treated wastewater outlet of the water-treatment pathway.
  • WO 2016/038606 describes a water treatment module, a bioreactor comprising one or more of such modules, a receptive water treatment system and method of using the same.
  • the water treatment module comprises (i) an elongated gas enclosure comprising a gas inlet and two vertical walls, at least one vertical wall comprising a water-impermeable and gas-permeable membrane having a water-facing side and a gas- facing side, the two vertical walls separating between water external to said enclosure and gas within said enclosure, the gas enclosure being in a rolled or folded configuration to thereby define a convoluted horizontal path and one or more water- treatment spaces formed between opposite water facing sides of the enclosure; and (ii) a diffuser arrangement comprising gas diffusers configured for introducing a stream of gas into the one or more water treatment spaces.
  • Provided by this disclosure is a method and system for treating a natural water body for removal of pollutants therefrom.
  • the water bodies are artificial, e.g. reservoirs created by engineering dams, artificial harbors (e.g. created through construction), natural bays, waterways
  • the method and system disclosed herein make use of one or more water treatment units, which in accordance with this disclosure, each have a water-tight enclosure with an oxygen-permeable, water-impermeable membrane that release oxygen into the polluted water by permeation from the enclosure's interior, through the membrane, into the surrounding water.
  • the water tight enclosure may be defined as having an interior facing side constituting the gas facing side of the membrane, and an exterior facing side constituting a water facing side of the membrane.
  • the water-tight enclosure of the treatment unit may be formed by two elongated, essentially parallel oxygen membranes that are sealed to one another, along their longitudinal edges.
  • the units may be also formed from a single elongated membrane sheet folded, with its two longitudinal edges sealed to one another, thereby defining an elongated sleeve.
  • the water-tight enclosure may also be formed as an elongated tube, e.g. by extrusion of the oxygen-permeable, water-impermeable membrane.
  • the treatment unit also comprises at least one gas inlet linked to a source of an oxygen-containing gas, and at least one gas outlet.
  • oxygen-containing gas ingresses into the enclosure through the at least one gas inlet, flows through the water tight enclosure and at least a portion thereof, flows out of the enclosure through at least one gas outlet.
  • the at least one inlet and at least one outlet are typically, but not exclusively, located at extreme opposite ends of the enclosure.
  • each water tight enclosure may have a single inlet and/or a single outlet. In other embodiments, there may be a single out let and two or more such inlets and outlets. In yet some other embodiments, there may be two or more inlets and a single outlet. In yet some other embodiments, there may be, independently, two or more inlets and two or more outlets.
  • the oxygen-permeable, water-impermeable membrane comprises or is a fabric formed of a first polymer, extrusion coated with a second polymer.
  • the coating may be applied to the water-facing side of the fabric, once sealed to form the water tight enclosure.
  • the thickness of the coating is between 5 to 20 microns.
  • the first polymer is a polyolefin, such as polyethylene or polypropylene or polyester.
  • the polyolefin is a dense polyolefin (medium to high density).
  • the water-impermeable, oxygen permeable membrane is formed of a microporous material.
  • the microporous material is a non-woven polymer.
  • the membrane may be microporous by its structure and water-impermeable as a result of surface tension and hydrophobic features of the membrane material.
  • the material permits oxygen diffusion therethrough from air at a lower pressure than hydrostatic pressure of the surrounding liquid.
  • its microporous structure permits releasing pulses of pressurized gas bubbles as a trouble shooting mechanism upon clogging or accumulation of solids on the water side surface of the membrane.
  • the non-woven fabric is a flashspun high-density polyethylene fibers such as Tyvek®, commercially available from Dupont.
  • a flashspun polymer is one formed from fine fibrillation of a film by the rapid evaporation of solvent and subsequent bonding during extrusion.
  • the second polymer comprises or is an alkyl -aciylate.
  • the coating by alkyl aciylate substantially seals the first polymer to passage of water without significantly depriving oxygen passage (by diffusion therethrough).
  • the alkyl-acrylate is one compatible with the first polymer, specifically, with polyolefin fabrics and more specifically polyethylene fabrics, so as to facilitate coating by extrusion.
  • the first polymer comprises or is a polystyrene fabric.
  • the second polymer is poly-methyl -pentene, that is compatible with polyester fabrics for coating by extrusion.
  • the enclosure may be made entirely of the oxygen-permeable and water- impermeable membrane or only portions thereof may be made of such membranes.
  • the water tight enclosure comprises one or more spacer elements disposed within the interior of the enclosure for separating the wall sections from one another and maintaining a minimal distance between the oxygen facing sides of the membrane, and as a result an open oxygen flow from the at least one inlet to the at least one outlet thereof.
  • the spacers are typically important when the intended gas pressure within the enclosure is below hydrostatic pressure; as then the spacer elements, in addition to imparting overall rigidity, also prevent the walls from collapsing one against the other and thereby blocking the path flow.
  • the one or more spacer elements can have the general form of a grid or net. While they can constitute independent elements, e.g. a netting element disposed within the interior of the enclosure, in some embodiments, the spacer element is integrally formed on at least a portion of one of the membrane.
  • such integral spacer elements can be configured as abutments on the gas facing side of the enclosure.
  • the abutments can have the form of rails, dimples, corrugations, hook like protrusions or any combination thereof.
  • the one or more spacer elements has a thickness or is otherwise configured to maintain the minimal distance between facing membranes of between about 1 to about 20 mm, at times, between 1 to 10mm, at times, between 2- 4mm.
  • the spacer elements are configured to withstand the hydrostatic pressure they are made of rigid materials, for example plastic materials including, without being limited thereto, polyethylene, polyethylene terephthalate (PET), polypropylene, polyamide, polyacetal and any combinations of same.
  • the treatment unit comprises a single water-tight enclosure may be used, for example, arranged in a spiral path or having a zig-zag, winding or serpentine path within the natural water body.
  • the treatment unit comprise more than one watertight enclosure; for example, extending parallel to one another within the natural water body.
  • the exact configuration may vary according to the intended use.
  • the one or more treatment unit is submerged within the natural water body to be treated and fixed within the water body in a manner to permit polluted portions of the water body to come into contact with the one or more treatment units, and then, in operation, oxygen containing gas is fed into the water-tight enclosure, typically via the dedicated inlet(s) of the one or more enclosures.
  • the oxygen-containing gas is fed into the enclosure in a continuous mode, in some other embodiments, the oxygen containing gas is fed into the enclosure intermittently.
  • the oxygen containing gas can be air, oxygen enriched air, pure oxygen etc.
  • the oxygen containing gas is air.
  • the oxygen-containing gas, fed into the enclosure is typically air coming from a fan, pump or blower.
  • the oxygen will permeate through the membrane, by fine permeation or diffusion, without causing bubbles that could stir the polluted water and negatively affect the efficiency of treatment.
  • pulses of pressured air are introduced into the enclosure, and causes air bubbles to be released through the microporous structure of the membrane, removing clogging solids that would otherwise continue to accumulate on the external surface of the membrane.
  • gas can be passively released from the enclosure out of one or more gas outlets.
  • the gas can be actively drawn or pumped out of at least one gas outlet.
  • oxygen containing air provides conditions for aerobic degradation of the sludge within the natural water body.
  • sludge In the water, sludge can be degraded either in anaerobic or aerobic conditions, each produce different degradation products.
  • the anaerobic degradation leads to products that are also considered as pollutants, commonly measured as Biochemical Oxygen Demand (BOD or Chemical Oxygen Demand (COD) as well as nitrogen compounds measured as Total Kjeldahl Nitrogen (TKN) or ammonium -nitrogen
  • Degradation of the aerobic path is environmental preferable since its products include carbon dioxide that can be released to the atmosphere leaving no pollutants in the water.
  • Conventional aeration means for aerobic degradation include diffusers that release bubbles of pressurized air in the depth of the water.
  • the operation of such diffusers typically consumes high energy and cause suspension of the solid particles, thus unwanted turbidity of the water.
  • the one or more treatment units are fixed in the water body in a manner to permit polluted portions of the water body to come into contact therewith.
  • the one or more treatment units are fixed at the bottom of the water body.
  • Such fixing may be, without being limited thereto, by coupling weight- imparting elements to the enclosure, for example, metal chains, metal weights, etc. or by anchoring the units at the bottom by constructing a base structure, e.g. made of concrete, and connecting the enclosure thereto.
  • the system can comprise one or more treatment units with water-tight enclosures of the type described above, an arrangement for fixing the unit within the water body, such that the units are essentially fully submerged therein (at times, e.g. due to water movement, some minor portions may be exposed to the atmosphere).
  • the system comprises a source of an oxygen-containing gas as well as a gas-feeding conduit arrangement linking the source to the at least one gas inlet.
  • the source of gas can be any one of a fan, blower or pump. It should be noted that other than a fan, pump or blower, where the oxygen-containing gas is air, the gas may also come from a pressurized source, such as oxygen-containing air, enriched air, or oxygen container.
  • the system comprises a gas releasing conduit arrangement linked to the at least one gas outlet ducting such gas out of the enclosure of the one or more treatment units.
  • this conduit arrangement may be a passive one, linking the enclosure's gas outlet towards an external port, for releasing this excess gas into the atmosphere, it may also comprise a gas-drawing unit (e.g. pump) for actively drawing or pumping gas out of the gas-releasing conduit arrangement.
  • a gas-drawing unit e.g. pump
  • the fixing arrangement for fixing the unit(s) submerged in the water body, typically at the bottom portion of the water body can comprise a weight-imparting element, metal chains, concrete element, and the like, each constituting a separate embodiment of the present disclosure.
  • the weight-imparting element can be part of the enclosure, either integral with the membrane or enclosed within the enclosure.
  • the weight- imparting element can be detachably attached to or coupled with the enclosure, typically to a portion of the water-facing surface of the enclosure.
  • the system may, by some embodiments, comprise also a floating platform supporting one or more of (i) a source of oxygen-containing gas, (ii) a gas releasing unit or port for releasing gas into the atmosphere and (iii) a system controller.
  • Figs. 1A-1F are schematic illustrations of a system according to an embodiment of the present disclosure, comprising two treatment units deployed horizontally within a water body (e.g. river); where Fig. 1A is an isometric view of the river having submerged therein the system according to this embodiment; Fig. IB is an enlarged view of a transverse cross section of one of the water-tight enclosures of a treatment unit illustrated in Fig. 1A; Fig. 1C is an illustration of gas source connected to the inlet of a treatment unit of Fig. 1A via inlet conduit arrangement; Fig. ID is a top view of a portion of the system of Fig. 2A illustration of the two water-tight enclosures fixed to the bottom of the body of water via dedicated supporting elements; and Fig. IE is an illustration of a gas outlet arrangement connected to the enclosure of a the treatment units of Fig. 1A.
  • Fig. IB is an enlarged view of a transverse cross section of one of the water-tight enclosures of a
  • FIGs. 2A-2E are schematic illustrations of a system disclosed herein in accordance with another embodiment of the present disclosure, with the water-tight enclosures having a tubular form, where Fig. 2A illustrates a river having submerged therein the system according to this embodiment; Fig. 2B provides a cross section of a portion of the water-tight enclosure of Fig. 2A; Fig. 2C is an illustration of gas source connected to the inlet of a treatment unit of Fig. 2A; Fig. 2D is a top view of a portion of the treatment unit of Fig. 2C; Fig. 2E is an illustration of a gas outlet arrangement connected to the enclosure of a the treatment units of Fig. 2 A.
  • Figs. 3A-3E are schematic illustrations of a system disclosed herein in accordance with yet another embodiment of the present disclosure, in this case, the water tight enclosure having a sleeve-like configuration, where Fig. 3A illustrates a river encompassing the system according to this embodiment; Fig. 3B provides a cross section of a portion of the water-tight enclosure of Fig 3 A; Fig. 3C is an illustration of gas source connected to the inlet of a treatment unit illustrated in Fig. 3A; Fig. 3D is a top view of a portion of the treatment unit of Fig. 3C; and Fig. 3E is an illustration of a gas outlet arrangement connected to the enclosure of a the treatment units of Fig. 3 A.
  • FIGs. 1A-1F are schematic illustrations of an exemplary embodiment of a natural water body 100 illustrated as a river, including a system 101 for treating the water body 100 from pollutants therein.
  • System 101 comprises, in accordance with this non-limiting embodiment, two treatment units 102 comprising each water tight enclosures 104 constructed from two elongated and essentially parallel sheets comprising, at in a portion thereof, oxygen permeable, water impermeable membranes 106 sealed to one another along their longitudinal edges in a manner to form an internal flow path for gas, as further described below.
  • the water tight enclosures 104 are longitudinally and horizontally deployed along the water body 100, one beside the other such that one of the two membranes 106 faces the bottom of the river.
  • the water-tight enclosure may be similarly deployed from a vessel sailing along the river. In this case, the water tight enclosure may be rolled as spiral and deployed within the water by unfolding while the vessel moves along the water body.
  • the system also comprises oxygen-containing gas inlets 108 fixed to one end 107 of the elongated enclosure 104 and connected via gas-feeding conduit arrangement 110 to a gas source 112, in this embodiment in a form of an air blower placed on the river bank, as also illustrated in Fig. 1C.
  • each water tight enclosure can be fed from a different source, via a separate gas feeding conduit arrangement.
  • System 101 also comprises two independent outlets 114, at opposite ends 109 of each elongated enclosure 104.
  • the gas outlets 114 are linked to a gas-releasing conduit arrangement 116 for ducting gas out of the enclosures.
  • outlet 114 can be coupled to outlet conduit arrangement 116 through a flexible connection segment 111, such as that shown in Fig. IF, to allow flexibility and free movements of the outlet conduit arrangement 116 e.g. due to water flow in the river 100.
  • gas releasing conduit arrangement 116 that links the gas outlets 114 to port 115, where gas flowing from within the enclosure 104 is released to the atmosphere.
  • Port 115 may be retained in position by fixation to a platform 117, such as a concrete platform.
  • Spacer elements 118 are configured to impart rigidity to the structure of the enclosures 104 such that under pressure, namely hydrostatic pressure, the two facing membranes 106 forming the enclosure 104 will not collapse.
  • gas is introduced into enclosure 104 at a pressure lower than the hydrostatic pressure surrounding the enclosure, and will be permeate through the membrane to the surrounding water by diffusion, without causing any gas bubbles that may cause turbulence and/or carry pollutants to the water surface.
  • Spacer elements may be in the form of a gridded net, such as the spacer element 118 illustrated in Fig.
  • spacer elements may be made of a plastic material.
  • the spacer elements may be made of a polyolefin such as polyethylene, polypropylene, or nylon or any other material typically used for the production of drainage nettings.
  • Fig. IB Further illustrated in Fig. IB are flexible linkers 122 such as metal chains, coupled to enclosure 104 at edges 120 and used for anchoring treatment units 102 to a bottom portion of the water body 100.
  • Flexible linkers 122 such as metal chains, coupled to enclosure 104 at edges 120 and used for anchoring treatment units 102 to a bottom portion of the water body 100.
  • Metal chains 102 can be coupled or fixed to the bottom of the water body, or to a weight-imparting element such as weight or a concrete platform (not illustrated), or it can have its own sufficient weight to provide fixation to the bottom, as illustrated in Fig. 1C or Fig. IE.
  • treatment units 102 may be held in place by supporting elements
  • Figs. 1C and ID These supporting elements may also function to retain the two enclosures 104 in a desired distance therebetween.
  • Support elements 124 may be formed as single rigid platform connected to the two (or more) treatment units, such that they mutually move within the water body.
  • Figs. 2A-2E and 3A-3E providing schematic illustrations of some other alternative embodiments according to this disclosure.
  • like elements to those of the embodiment shown in Figs. 1A-1E have been given like reference numerals, shifted by a hundred or two hundreds, respectively.
  • the water-tight enclosure 204 and its oxygen-permeable, water-impermeable membrane 206 are functionally equivalent to water-tight enclosure 104 and its oxygen-permeable, water-impermeable membrane 106.
  • FIG. 2A-2E show a treatment unit 202, in which the enclosure 204 has a tubular form, e.g. tubular pipe.
  • the enclosure 204 has a tubular form, e.g. tubular pipe.
  • a single enclosure 204 being windingly deployed along the elongated water body crossing from one bank 221 of the water body, to the other bank 223 thereof.
  • the tubular configuration of enclosure 204 is maintained by the use of internal spacer element 218 that may be a coiled spacer within the enclosure as shown in Fig. 2B.
  • peripheral rings 220 circulating the enclosure along its length, to which chains 222 are coupled so as to fixate the enclosure to the bottom portion of the water body.
  • Floating platform 217 (in figs 1 A and IE it is not floating but fixed to the bank) Floating platform 217, shown in Figs. 2A and 2E, is fixed to outlet conduit arrangement 216, thus maintaining port 215 above water level such that gas is released from the enclosure to the atmosphere.
  • enclosure 304 is in a form of an elongated sleeve-like membrane deployed in a windingly manner as described above with respect to Figs 2A-2E.
  • the sleeve-like configuration may be defined by a cross-section of the enclosure in one dimension that is greater than its cross section in a second dimension thereof, the second dimension being perpendicular to the first dimension.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Molecular Biology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

La présente invention concerne un procédé de traitement d'une masse d'eau naturelle pour l'élimination de polluants, consistant à (i) immerger une ou plusieurs unités de traitement d'eau ayant une enceinte étanche à l'eau qui comprend une membrane perméable à l'oxygène et imperméable à l'eau pour libérer de l'oxygène dans l'eau par perméation à travers celle-ci ; (ii) fixer la ou les unités de traitement d'eau à l'intérieur de la masse d'eau de manière à permettre à des parties polluées de la masse d'eau d'entrer en contact avec ladite ou lesdites unités ; et (iii) introduire un gaz contenant de l'oxygène dans l'enceinte de ladite ou desdites unités. La présente invention concerne également un système de traitement d'une masse d'eau naturelle polluée, comprenant (i) une ou plusieurs unités de traitement d'eau ayant chacune une enceinte étanche à l'eau qui comprend une membrane perméable à l'oxygène et imperméable à l'eau pour libérer de l'oxygène dans le milieu environnant par perméation à travers celle-ci ; (ii) un agencement de fixation pour fixer lesdites unités à l'intérieur de la masse d'eau de telle sorte que l'unité est entièrement immergée dans cette dernière ; (iii) au moins une entrée de gaz dans ladite unité configurée pour recevoir un gaz contenant de l'oxygène ; et (iv) au moins une sortie de gaz.
PCT/IL2018/050168 2017-02-13 2018-02-13 Procédé et système de traitement de masse d'eau WO2018146692A1 (fr)

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EP3848111A1 (fr) * 2020-01-08 2021-07-14 Arnold Jäger Holding GmbH Diffuseur à bande ainsi que dispositif diffuseur

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CN208561869U (zh) * 2017-02-13 2019-03-01 福伦斯水产品和创新有限公司 处理水体的系统

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US20040079692A1 (en) * 2000-03-08 2004-04-29 Zenon Environmental Inc. Membrane module for gas transfer and membrane supported biofilm process
WO2011073977A1 (fr) 2009-12-14 2011-06-23 Emefcy Ltd. Aération par diffusion pour eau et traitement d'eaux usées
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CN109371937A (zh) * 2018-10-30 2019-02-22 江苏省农业科学院 一种基于周丛生物的农田生态沟渠
EP3848111A1 (fr) * 2020-01-08 2021-07-14 Arnold Jäger Holding GmbH Diffuseur à bande ainsi que dispositif diffuseur
WO2021140151A1 (fr) 2020-01-08 2021-07-15 Arnold Jäger Holding GmbH Aérateur à bande et ensemble aérateur

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CN108423846A (zh) 2018-08-21

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