EP3634916A1 - Purification d'eau - Google Patents

Purification d'eau

Info

Publication number
EP3634916A1
EP3634916A1 EP18729207.3A EP18729207A EP3634916A1 EP 3634916 A1 EP3634916 A1 EP 3634916A1 EP 18729207 A EP18729207 A EP 18729207A EP 3634916 A1 EP3634916 A1 EP 3634916A1
Authority
EP
European Patent Office
Prior art keywords
tub
layer
pressure
water
treating wastewater
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP18729207.3A
Other languages
German (de)
English (en)
Inventor
Dionysius Cornelius Antonius Maria VAN OIRSCHOT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rietland bvba
Original Assignee
Rietland bvba
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 Rietland bvba filed Critical Rietland bvba
Publication of EP3634916A1 publication Critical patent/EP3634916A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • C02F3/04—Aerobic processes using trickle filters
    • 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
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/301—Aerobic and anaerobic treatment in the same reactor
    • 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
    • C02F2103/44—Nature of the water, waste water, sewage or sludge to be treated from vehicle washing facilities
    • 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
    • C02F3/10—Packings; Fillings; Grids
    • C02F3/104—Granular carriers
    • 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 invention relates to a device for treating wastewater, comprising:
  • a granular substrate which substantially fills the tub, wherein the granular substrate comprises at least 90% granules with a granule size greater than 1 mm and smaller than 120 mm;
  • the invention further relates to a method for constructing such a device.
  • US 2003/0024874 describes a system and method for removing impurities from water.
  • the principle of purifying water is here based on natural water purification using plants, particularly reed. Such systems are known as so-called wetlands.
  • This device describes a surface which is provided with plants. The plants are placed on a granular substrate and are configured such that water can be supplied, can flow through the device and can then be discharged. When the water flows through the device, the water flows along the roots of the plants and along the granules of the granular substrate.
  • the roots of the plants in particular are known to add oxygen to the water, so that aerobic bacterial growth is stimulated. At locations where no or less oxygen is present anaerobic bacterial growth will occur.
  • the granules of the granular substrate have a surface to which the bacteria can adhere.
  • the aerobic and anaerobic bacteria break down the contaminants from the water, so that the water is purified.
  • the granules of the granular substrate provide here an adhesion surface for the bacteria, and at the same time provide for a water-permeability so that the water is able to flow between the granules along the bacteria.
  • the device of US 2003/0024874 describes a so-called wetland wherein air is supplied on the underside of the device. This improves the purification process of the water. Reed is provided on an upper side of the wetland.
  • a drawback of such devices is that a large surface area has to be available and is taken up by the device. Particularly in industrial areas, when a notably large flow rate of water must be purified, there is often insufficient space to construct such a device.
  • the device for treating wastewater according to the invention is characterized for this purpose by a pressure-distributing layer with substantially flat finishing layer being provided on the granular substrate at the position of the upper segment of the tub, such that the device can be walked on.
  • the invention is based on the insight that when air is supplied at the bottom of the device and moves through the granules of the granular substrate toward the water surface, oxygen can be added so as to stimulate bacterial growth without plants having to be provided for this purpose. Plants may be provided, but need not necessarily be provided in order to enable the water purification.
  • the device according to the invention is provided here with a pressure-distributing layer with a finishing layer. Providing the pressure-distributing layer enables the granular substrate to be walked on.
  • the top side of the device can be walked on, the space taken up by the device is multifunctional.
  • a traditional wetland is not multifunctional and functions only as water purification, wherein the top of the wetland is typically taken up by reed.
  • the top side can be walked on, such that it can function as a path or seating area, or other surface which can be walked on.
  • the pressure-distributing layer and finishing layer can be formed in different ways, integrated or separately of each other.
  • the pressure-distributing layer can also be formed by grass grids, wherein grass is provided as finishing layer.
  • grass grids can be walked on and the grass gives the device a natural appearance.
  • the pressure-distributing layer and finishing layer can be embodied as a hardened surface, for instance tiles.
  • the top layer of the tiles can here form the finishing layer, while the structure of the tile provides for the pressure distribution.
  • the device is multifunctional, the impact on the surrounding area of the device being arranged is considerably smaller than in the case of a wetland.
  • the device according to the invention will hereby be considerably more widely applicable, and can be arranged more efficiently in the surrounding area.
  • the substantially watertight tub is preferably embodied as a combination of an excavation in the ground with a substantially watertight layer.
  • the device according to the invention operates optimally when the water flows through the device slowly.
  • a tub with a large volume is necessary in order to purify large flow rates of water with such a device.
  • Such a tub with a large volume can be formed very cost-effectively by digging an excavation in the ground and providing the walls and the bottom of the excavation with a watertight layer. By digging an excavation in the ground and providing a watertight layer it is not necessary to provide a preformed tub.
  • a preformed tub, particularly with large dimensions, is difficult to transport and is typically heavy and difficult to handle.
  • the watertight tub embodied as a combination of an excavation in the ground with a watertight layer can be realized inexpensively and be made to size in simple manner. This further facilitates setting up of the device in the surrounding area, taking into consideration ambient factors such as available surface area and the form of this available surface area.
  • the finishing layer preferably extends at the height of the edges of the excavation so that the excavation is covered by the device.
  • the ground surface adjacently of the excavation will continue into the finishing layer of the device. Because the finishing layer can be walked on, a user will thus be able to walk from a position adjacently of the device to a position on the device without notable obstacles.
  • Having the finishing layer extend at the height of the edges allows the device to be fully incorporated into the surrounding area. The visual impact of the device within the surrounding area will be zero particularly when the finishing layer of the device is chosen to at least locally correspond to or be at least partially the same as a finishing layer of the ground around the excavation.
  • the upper side of the pressure-distributing layer is preferably embodied as finishing layer. This simplifies installation of the device. Placing the pressure-distributing layer simultaneously provides the finishing layer.
  • the pressure-distributing layer with the substantially flat finishing layer is preferably configured to be passable by car.
  • the skilled person is deemed to be familiar with structural requirements for making a surface passable for a car.
  • DIN standard 53454 will for instance apply and the grass grids will preferably be able to withstand a load of at least 150 tons/m 2 , preferably at least 250 tons/m 2 .
  • Other standards which are deemed known by the skilled person, will be relevant for other structures and/or other materials as pressure-distributing layer.
  • the pressure-distributing layer with the finishing layer is configured to be passable by car, the device can be provided under a car park.
  • the upper side of the device can serve as ground surface for the car park. This further increases the possible applications of the device according to the invention.
  • the pressure-distributing layer is water-permeable, rainwater, which may or may not be contaminated with oil residues and so on of parked vehicles, will find its way directly into the device and be treated.
  • the pressure-distributing layer is preferably constructed with a plurality of rigid elements which are placed in a grid in order to cover substantially the whole upper side of the device.
  • the grid here preferably has a plurality of rows and a plurality of columns, and the plurality of rigid elements can be connected to each other. Constructing the pressure-distributing layer as a grid provides increased flexibility in determining of the width and length of the device. Transporting of such rigid elements is also simple. Tests have shown that a pressure-distributing layer constructed with such multiple rigid elements provides sufficient stability to make it passable by foot and/or by car.
  • the plurality of rigid elements are preferably formed by grass grids.
  • Grass can be provided on the grass grids in order to create an natural appearance.
  • Grass grids are already known for their ability to be walked on and also to be driven on by cars.
  • Grass grids are further air-permeable, such that the air supplied at the bottom of the device is able to escape through the grass grids.
  • air discharge elements can be provided at the position of an upper side of the device, under the pressure-distributing layer and/or finishing layer, in order to discharge air via for instance a flue.
  • the pressure-distributing layer preferably has a lower segment with crushed granules. Crushed granules are known to be water and air-permeable and to offer a greater resistance against sliding/displacing relative to each other. A more stable layer is hereby obtained.
  • the pressure-distributing layer is preferably air-permeable such that air, supplied into the tub via the air feed, can leave the device via the pressure-distributing layer.
  • the pressure- distributing layer is air-permeable, the air supplied at the bottom of the device can move upward in natural manner and leave the device at the top, via the pressure-distributing layer.
  • the watertight tub preferably has a surface area of at least 35 m 2 , more preferably at least
  • the device according to the invention is particularly suitable for purifying large flow rates and/or volumes of water.
  • the granule size is preferably greater than 4 mm, more preferably greater than 6 mm and the granule size is preferably smaller than 80 mm, more preferably smaller than 50 mm, most preferably smaller than 25 mm. Tests have shown that the granule size has an effect on the throughflow of water and air on the one hand and on the facilitating of the bacterial growth on the other hand.. The granule size ideally lies between 8 and 16 mm.
  • the outlet is preferably embodied as overflow to keep a water level in the device substantially constant.
  • the volume of water in the device will hereby remain substantially constant.
  • the invention further relates to a car wash wherein at least a part of a washing zone is provided above a device according to the invention, wherein the pressure-distributing layer with the substantially flat finishing layer is water-permeable such that the inlet is at least partially formed by the pressure-distributing layer with finishing layer.
  • a car wash has been found to be an ideal use for the device according to the invention. Cars can be washed on the device, wherein the dirty washing water falls directly onto the upper side of the device and finds its way via the upper side, through the water-permeable pressure-distributing layer, into the device. There, the washing water can be purified.
  • the invention further relates to a method for constructing a device according to the invention, wherein the method comprises of:
  • the granular substrate comprises at least 90% granules with a granule size greater than 1 mm and smaller than 120 mm; providing an inlet for supplying wastewater to the tub and an outlet for discharging wastewater from the tub;
  • the method further comprises of providing a pressure-distributing layer with a substantially flat finishing layer on the granular substrate, such that the device can be walked on.
  • the method allows a device with the above described advantages and effects to be provided in cost-effective manner.
  • Figure 1 shows an installation for purifying water, embodied as prior art wetland 1 ;
  • Figure 2 shows a schematic cross-section of an installation for purifying water according to a first embodiment of the invention.
  • Figure 3 shows a schematic cross-section of an installation according to a second embodiment of the invention.
  • FIG. 1 shows a prior art wetland 1.
  • Wetland 1 comprises a watertight tub 2, for instance formed by digging an excavation and placing a PE film against the walls and bottom of the excavation and thus making the walls of the excavation substantially watertight.
  • watertight tub 2 Provided at the bottom of watertight tub 2 is an air feed 3 for blowing air into the tub. Further provided at the bottom of the tub is a water discharge 4, embodied as drainage pipe, which is connected to an overflow 5 for discharging water from the tub. By making use of an overflow 5 for discharging water a substantially constant water level can be maintained in the tub.
  • the tub is substantially wholly filled with gravel 1 1.
  • Plants 6 are provided in the gravel at the top of the tub. Reed is a known plant for such installations for purifying water.
  • the reed covers the installation substantially wholly and grows over the installation. For the sake of clarity the reed is only shown on the left-hand side in figure 1 , the whole installation will be overgrown in practice.
  • the roots of the reed extend from the upper segment of the granular substrate 1 1 , this being the top layer of the granular substrate 1 1 , into a central segment of granular substrate 1 1 .
  • the central segment of granular substrate 1 1 is the segment lying between the upper segment of granular substrate 1 1 and the lower segment of granular substrate 1 1.
  • the lower segment of granular substrate 1 1 is defined here as the segment in which air feed 3 and/or the drainage pipe is provided.
  • Figure 2 shows a cross-section according to a first embodiment of the invention, in this first embodiment the water for purifying is guided vertically through the device.
  • the upper side of the device preferably substantially the whole upper surface of watertight tub 2, is for this purpose configured as an inlet for water.
  • the pressure-distributing layer 9 with finishing layer 10 is water-permeable, such that the water can be added to watertight tub 2 via finishing layer 10. This is illustrated in figure 2 with arrows 8. This allows a user of the device to distribute the water over finishing layer 10 as they see fit so that it can enter in accordance with this distribution.
  • a water supply 7, and preferably a water manifold can be provided under pressure-distributing layer 9 and/or under finishing layer 10, wherein water can be added.
  • a pipe system can for instance be provided in an upper segment of granular substrate 1 1. This pipe system can be provided with holes, such that the pipe system can be pumped full of water for purifying, wherein the water flows via the holes into the device.
  • a pretreatment system can be provided here before the water is transferred to the pipe system, so that impurities of a size which could block the holes are stopped by the pretreatment system. Examples of pretreatment systems are a septic tank, particulate filter, primary settling tank, lamella separator, grease trap or other type of pretreatment system.
  • Figure 2 is based on a water-permeable pressure-distributing layer 9 with finishing layer 10.
  • a water discharge 4 Provided at the bottom of the structure is a water discharge 4.
  • the water discharge 4 at the bottom is preferably formed by providing a set of drainage pipes at the position of a lower segment of granular substrate 1 1 and connecting this drainage pipe system to an overflow 5 for discharging water.
  • discharge openings can also be provided in a lower segment of granular substrate 1 1. These discharge openings can then be connected to water pumps, which preferably discharge water in controlled manner.
  • Air feed 3 is preferably connected to a compressor or blower for supplying compressed air to air feed 3.
  • air feed 3 is embodied as a pipe system wherein holes (not shown) through which air can escape are provided in the pipes at regular distances.
  • air feed 3 is formed by a plurality of air supply elements.
  • the compressor preferably supplies a predetermined flow rate of air. The air will typically move upward in bubbles when the air is added in the lower segment.
  • the lower and middle segment of granular substrate 1 1 are typically submerged.
  • air injectors can be provided in the device at predetermined positions.
  • Air feed 3 can optionally be placed higher than water discharge 4, and preferably higher than 20 cm, more preferably higher than 30 cm relative to water discharge 4.
  • the water above air feed 3 will mainly come into contact with aerobic bacteria, while the water below air feed 3 will mainly come into contact with anaerobic bacteria.
  • the water can hereby be purified by a combination of aerobic and anaerobic bacteria.
  • Air feed 3 can further be distributed and positioned in the device such that it is possible to identify the zones in the device in which more air is added than in other zones. Alternatively, the air can be supplied intermittently by alternately switching the compressor or blower on and off.
  • the distributing of the air supply in space and/or time can further be used to adjust the aeration to a possibly variable supply of wastewater. This can save energy.
  • the intensity of aeration can further be varied by providing a plurality of
  • the device comprises a pressure- distributing layer 9 with a finishing layer 10.
  • the pressure- distributing layer 9 is formed by grass grids.
  • Grass grids are plastic open structures of modular construction which can be coupled to each other in order to cover a surface.
  • the grass grids are configured here to distribute pressure. Because the grass grids are open structures, water can enter through the grass grids in simple manner. The air which is supplied at the bottom of the device via air supply 3 can further easily escape from the device via the grass grids.
  • finishing layer 10 is formed by grass sown in and/or on the grass grids. It is optionally possible here to fill the grass grids with a soil substrate. The soil substrate thereby forms together with the grass the finishing layer 10 and ensures that the grass is able to take root.
  • Pressure-distributing layer 9 is optionally provided at the bottom with crushed granules 12.
  • Crushed granules 12 typically have a higher resistance to sliding, whereby a more stable layer can be obtained with crushed granules 12 than with whole granules 12.
  • a layer of crushed granules 12 typically has a higher density and greater strength, whereby it is suitable to be placed at the bottom of a pressure-distributing layer 9.
  • Granular substrate 1 1 forms the bulk material for filling watertight tub 2.
  • granular substrate 1 1 can be formed by any substrate which allows water and air to pass and with which an excavation can be filled.
  • Granular substrate 1 1 can preferably be formed by gravel, by plastic granules or by another type of granular material. The granules serve on the one hand as a passage for water and air and on the other hand as adhering surface for bacteria.
  • the watertight tub 2 of figure 2 is formed by a combination of an excavation in ground 13 with a watertight layer 14 at the position of the walls of the excavation.
  • the walls are here deemed to comprise the bottom.
  • watertight layers which can be used for sealing walls of an excavation are PE, preferably PE film.
  • PE film preferably PE film.
  • PVC or EPDM film can be applied.
  • Tests have been performed with flexible polypropylene (FPP) as watertight layer.
  • FPP flexible polypropylene
  • a concrete floor and concrete walls can be poured.
  • clay mats having a high degree of watertightness can be provided.
  • the above stated examples are not limitative and the skilled person will appreciate that many options can be envisaged for making walls and bottom of an excavation substantially watertight.
  • the walls it is not essential for the walls to be 100% watertight, but the walls do have to be able to fulfil a function of retaining sufficient water in the tub and of admitting a controlled inflow and outflow of water into and out of the tub. Minimal leakage through the walls of the device does not detract from the operation of the device.
  • Finishing layer 10 of the device of figure 2 is provided at the height of ground level 15 of the surrounding area.
  • the ground level 15 of the surrounding area will therefore preferably continue substantially without interruption into the finishing layer 10 of the device.
  • a sloping surrounding area it will be apparent that only a portion of the surrounding area will come to lie at the height of finishing layer 10 of the device.
  • One edge or a segment of one or more edges can thus for instance be provided continuing into the ground surface.
  • FIG 3 shows an alternative embodiment of a device according to the invention.
  • the device according to figure 3 is embodied as horizontal flow-through installation.
  • Water supply 7 is here arranged on one side (in figure 3 on the left-hand side) or at the position of one edge of the device, while water discharge 4 is arranged on another side (in figure 3 the right-hand side) or opposite edge of the device.
  • Water supply 7 and water discharge 4 can be arranged differently than described above.
  • Water supply 7, also referred to as inlet can thus be embodied as one or more water supply pipes or channels which are connected to the device above the water surface of the device or below the water surface of the device so that water can be supplied to the device at the position of one side or edge.
  • Water discharge 4, also referred to as outlet will in such a configuration not extend at the position of a lower side of the device, or do so to lesser extent, but will extend at the position of an opposite side, wherein the discharge can for instance be provided directly as overflow 5.
  • pressure-distributing layer 9 with finishing layer 10 is provided as tile paving.
  • a series of tiles is laid on granular substrate 1 1 , optionally with a layer of crushed granules 12 between granular substrate 1 1 and the tiles, wherein the tiles have both a pressure- distributing function and a finishing function.
  • the tiles can be provided with water-permeable and air-permeable joins. This allows the device of figure 3 to operate according to the principles as described above with reference to figure 2.
  • pressure-distributing layer 9 and finishing layer 10 are not water-permeable and not air-permeable, or negligibly so.
  • an air discharge 16 will have to be provided under pressure- distributing layer 9 and/or finishing layer 10 for the purpose of discharging the air.
  • Collectors or collecting points in which air is collected to be discharged can for instance be provided at the top of granular substrate 1 1.
  • the device can be embodied such that the water level comes to lie several centimetres below the underside of pressure-distributing layer 9 and/or finishing layer 10 by placing overflow 5 at a predetermined height, such that air is collected at the top of the device and can there be discharged from the upper side via a horizontal displacement on a predetermined side or at a predetermined location. This allows the device to be arranged under for instance an underground car park or under a building.
  • zones in which air is supplied at the bottom of the device, as seen in the flow direction of the water, can be alternated with zones in which no or less air is supplied. Zones with aerobic bacteria and zones with anaerobic bacteria are hereby obtained.
  • a device as shown in figures 2 and 3 is preferably constructed in situ.
  • the device is here preferably constructed from the bottom up, starting with digging an excavation and forming watertight tub 2 by placing the watertight material on the walls of the excavation, thus forming watertight tub 2.
  • Water discharge 4 or air feed 3 is then placed depending on the type of device, horizontal or vertical throughflow of water.
  • Each of the water discharge 4 and air feed 3 can be placed on a layer of granular substrate 1 1 such that a distance is created between the bottom of watertight tub 2 and air feed 3 and/or water discharge 4 by the layer of granular substrate 1 1.
  • the middle segment of watertight tub 2 is then typically filled with the granular substrate 1 1.
  • a layer of crushed granular substrate 1 1 is then optionally put down, on which a pressure- distributing layer 9 with finishing layer 10 is placed.
  • Water discharge 4 is typically connected to an overflow 5 in order to achieve a substantially constant water level in the device. It may further be necessary when starting up the device to add one or more predetermined bacterial cultures to the device, so that they can adhere to the surfaces of the granules in the device. The bacteria feed on the impurities in the water, whereby the bacteria multiply and whereby the water is purified.
  • the method for forming the device, and the manner in which the water is purified in the device, is very environmentally friendly and inexpensive. Because the device can be built into a surrounding area in flexible manner as a result of its pressure-distributing layer 9 with finishing layer 10, the device has considerable advantages relative to existing water purification installations.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Biological Treatment Of Waste Water (AREA)

Abstract

Le dispositif de traitement d'eaux usées comprend : une cuve sensiblement étanche à l'eau; une entrée pour la fourniture des eaux usées à la cuve; une sortie pour l'évacuation des eaux usées de la cuve; un substrat granulaire qui remplit sensiblement la cuve, le substrat granulaire comprenant au moins 90 % de granulés ayant une taille de granule supérieure à 1 mm et inférieure à 120 mm; une alimentation en air disposée à la position d'un fond de la cuve; une couche de distribution de pression ayant une couche de finition sensiblement plate étant disposée sur le substrat granulaire au niveau de la position d'un segment supérieur de la cuve, de telle sorte que le dispositif peut être mis en marche.
EP18729207.3A 2017-05-22 2018-05-16 Purification d'eau Ceased EP3634916A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2017/5370A BE1025249B1 (nl) 2017-05-22 2017-05-22 Waterzuivering
PCT/IB2018/053423 WO2018215888A1 (fr) 2017-05-22 2018-05-16 Purification d'eau

Publications (1)

Publication Number Publication Date
EP3634916A1 true EP3634916A1 (fr) 2020-04-15

Family

ID=58992554

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18729207.3A Ceased EP3634916A1 (fr) 2017-05-22 2018-05-16 Purification d'eau

Country Status (3)

Country Link
EP (1) EP3634916A1 (fr)
BE (1) BE1025249B1 (fr)
WO (1) WO2018215888A1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6652743B2 (en) 1997-06-23 2003-11-25 North American Wetland Engineering, Inc. System and method for removing pollutants from water
US20060151387A1 (en) * 2004-12-06 2006-07-13 Russell Yost Multiple soil-layering system for wastewater purification

Also Published As

Publication number Publication date
WO2018215888A1 (fr) 2018-11-29
BE1025249B1 (nl) 2018-12-18
BE1025249A1 (nl) 2018-12-14

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