Water treatment and recycling device

Abstract

The invention relates to a water treatment and recycling sensor comprising: a vessel comprising microorganisms which are capable of carrying out anaerobic digestion of at least a portion of the phosphorus and / or nitrogen contained in the water to be treated; a vessel comprising microorganisms which are capable of carrying out aerobic digestion of at least a portion of the organic matter contained in the water to be treated; and a tank for storing treated water after the aerobic treatment. The treatment device comprises: means for circulating the water to be treated from the anaerobic vessel to the aerobic vessel; a filtration means comprising a submerged filtration membrane, having a cut-off threshold of less than 0.1 μm, in the aerobic vessel and pumping means which are arranged to allow the treated water to circulate through the submerged filtration membrane from the aerobic vessel to the storage tank; and a gas injection means which is arranged to inject ambient air, in contact with the submerged filtration membrane, into the aerobic vessel. The device is arranged such that a ratio between a volume of the aerobic vessel and a volume of the anaerobic vessel is between 15 and 0.15.

Description

[0001] DESCRIPTION

[0002] TITLE: Water treatment and recycling device

[0003] Technical field

[0004] The present invention relates to the field of wastewater treatment and water recycling.

[0005] The invention relates to the treatment of wastewater from homes, boats, in particular maritime, river or other floating habitats, as well as containers or various mobile units.

[0006] The invention also relates to the treatment of wastewater from industrial and agricultural sites or treatment plants.

[0007] State of the prior art

[0008] Wastewater discharges into the environment contribute to the eutrophication of waterways and the growth of algae, leading to the death of living organisms. These discharges also cause damage to ships and submerged infrastructure, as well as blockages to navigation.

[0009] Wastewater discharge also poses a health risk due to the presence of induced pathogens, such as bacteria, viruses, and parasites. Endocrine disruptors, such as drug residues or heavy metals, are found in surface water, on the coast, in lakes and rivers, and also in drinking water through supply networks and groundwater, which are also contaminated.

[0010] Wastewater management at land, port, and maritime levels is also a growing problem and a major ecological issue. Among the waste produced, wastewater (black water, gray water, or water from processes) generated locally or pumped from various sources (including ships) represents a daily volume of several thousand cubic meters.

[0011] As regulatory constraints evolve, the volume of wastewater to be treated continues to increase. Indeed, while in the past, wastewater was discharged into waterways or the sea, new standards require retention and / or on-site treatment. In state-of-the-art systems, when buildings are not connected to the sewer system, they are equipped with septic tanks or micro-stations, while boats are equipped with black water recovery tanks (black water) and emptied in dedicated port stations when these infrastructures exist. In boats, due to the limited space on board, no state-of-the-art system can treat water on board.

[0012] Current systems have several drawbacks. On land, the space required to spread pre-treated wastewater is large, the quality of treatment is limited, and the discharged water is wasted.

[0013] Furthermore, septic tanks or micro-stations fitted to individual houses do not provide treated water of sufficient quality for reuse.

[0014] On boats, it is no longer possible to use the infrastructure when the tanks reach saturation. Some buildings or ships are equipped with dry toilets to avoid generating black water. These systems also have several disadvantages: gray water (showers) and greasy water (from the kitchen) must always be treated. In addition, the implementation of dry toilets also has certain disadvantages in the event of saturation. Indeed: emptying the contents outside the areas provided for this purpose is prohibited, emptying the contents into the trash, in any form whatsoever, is prohibited, composting presents risks, particularly health risks, the contents of dry toilets, being too dense and dry, cannot be entrusted to black water pumping stations or be discharged into the sewer system.

[0015] State-of-the-art systems offer little, if any, flexibility. They are designed for a specific application and do not tolerate changes in operating conditions. Furthermore, state-of-the-art systems are marketed with their specific tank model.

[0016] Thus, there is currently no treatment device that allows the complete recycling of wastewater by a single device. An aim of the invention is, in addition, to propose a water treatment and recycling device:

[0017] - enabling the resolution, at least in part, of the disadvantages of state-of-the-art devices, and / or

[0018] - flexible and / or modular allowing autonomous management of grey and black water and / or rainwater, and / or

[0019] - allowing complete recycling of treated water, and / or

[0020] - allowing the treatment and / or recycling of wastewater regardless of the treatment location and, and / or

[0021] - inexpensive and / or allowing, as far as possible, the elimination of management, control and real-time monitoring systems for treatment, particularly in biological water treatment units, and / or

[0022] - compact.

[0023] Presentation of the invention

[0024] For this purpose, a water treatment and recycling device is proposed, called a treatment device, comprising, in a direction of circulation of the water to be treated in said device:

[0025] - a tank, called an anaerobic tank, comprising micro-organisms capable of carrying out anaerobic digestion of at least part of the phosphorus and / or nitrogen contained in the water to be treated,

[0026] - a tank, called an aerobic tank, comprising micro-organisms capable of carrying out aerobic digestion of at least part of the organic matter contained in the water to be treated,

[0027] - a storage tank for treated water after aerobic treatment, and

[0028] - means for circulating the water to be treated from the anaerobic tank to the aerobic tank.

[0029] The treatment device comprises a filtration means comprising: a filtration membrane immersed in the aerobic tank, the cut-off threshold of which is less than 0.1 pm,

[0030] - pumping means arranged to allow circulation of the treated water, through the submerged filtration membrane, from the aerobic tank to the storage tank.

[0031] The filtration means according to the invention makes it possible to do without a clarifier. Preferably, the anaerobic tank is, in addition, arranged to carry out primary decantation of the decantable materials.

[0032] The treatment device comprises a gas injection means arranged to inject ambient air, in contact with the submerged filtration membrane, into the aerobic tank.

[0033] Preferably, the treatment device is arranged so that a ratio between a volume of the aerobic tank and a volume of the anaerobic tank is between 15 and 0.15.

[0034] The ratio between a volume of the aerobic tank and a volume of the anaerobic tank according to the invention allows for optimal biological water treatment. It also eliminates the need for monitoring of biological oxygen demand (BOD) or chemical oxygen demand (COD).

[0035] In the present description, the term “device” used alone refers to the treatment device according to the invention.

[0036] Preferably, a volume of the anaerobic tank is between 0.5 and 2 times a daily volume of the water to be treated.

[0037] Preferably, a volume of the aerobic tank is greater than 1 m 3 .

[0038] Preferably, the volume of the aerobic tank is between 1 and 20 m 3 for individual installations, such as, for example, individual houses or boats.

[0039] Preferably, the volume of the aerobic tank is between 1, preferably 20 m 3 , and 3000 m 3 for industrial and agricultural sites or wastewater treatment plants.

[0040] Preferably, a water column height in the aerobic tank is between 80 and 300 cm.

[0041] Preferably, the treatment device comprises a single or single submerged filtration membrane for a water column height in the aerobic tank of between 80 and 200 cm.

[0042] Preferably, the treatment device comprises a double submerged filtration membrane for a water column height in the aerobic tank of between 160 and 300 cm. Preferably, the treatment device comprises, at the outlet of the anaerobic tank, relative to the direction of circulation of the water to be treated in the device, means for screening the water to be treated, the cut-off threshold of which is between 0.1 and 20 mm.

[0043] Preferably, the water to be treated in the device circulates through the anaerobic tank, then through the aerobic tank and then into the storage tank.

[0044] Preferably, the gas injection means comprises diffusion means arranged to emit fine gas bubbles, having a size typically less than 5 mm, and large gas bubbles, having a size typically greater than 1 cm, of ambient air into the aerobic tank.

[0045] Preferably, the gas injected, by the diffusion means, into the aerobic tank is ambient air.

[0046] Preferably, the gas injection means and / or the diffusion means are arranged so that the gas bubbles are in laminar flow along one or more walls of the submerged filtration membrane.

[0047] Preferably, the laminar flow of ambient air along one or more walls of the submerged filtration membrane acts or functions to exert friction on the wall or walls of the submerged filtration membrane. By the wall or walls of the submerged filtration membrane, it may be understood: one or more external walls and / or one or more internal walls of the submerged filtration membrane.

[0048] Preferably, the treatment device comprises, upstream of the storage tank, relative to the direction of circulation of the water to be treated in the device, means for residual disinfection of the treated water coming from the aerobic tank.

[0049] Preferably, when the water treated by the device is intended to be reused, for example for a non-food domestic application such as shower water, or to make it potable, the treatment device may comprise downstream, relative to the direction of circulation of the water to be treated in the device, of the storage tank:

[0050] - an activated carbon filter, and / or

[0051] - a pocket filter, and / or - a germicidal lamp, and / or

[0052] - a reverse osmosis system, and / or

[0053] - a means of oxidizing the treated water contained in the storage tank.

[0054] Preferably, the water oxidizing means is an ozone generator. Preferably, the ozone generator is arranged to form ozone in the form of bubbles in the storage tank.

[0055] Preferably, the treatment device is also arranged to recycle rainwater. For this purpose, the treatment device preferably comprises a rainwater recovery means arranged to collect and supply the storage basin with rainwater. Preferably, the rainwater recovery means comprises screening means with a cut-off threshold of between 0.1 and 5 mm.

[0056] Preferably, the filtration means is arranged to operate an instantaneous filtration rate of between 0.0007 and 0.003 of a daily flow rate of water to be treated.

[0057] Preferably, when the water to be treated by the treatment device comes from industrial sites, agricultural operations or treatment plants, the treatment device comprises:

[0058] - in the aerobic tank, an anoxic compartment whose volume is between 40% and 60% of the volume of the aerobic tank, and / or

[0059] - an additional aeration tank, located upstream of the aerobic tank and downstream of the anaerobic tank, relative to the direction of circulation of the water to be treated in the device; in this case, the device preferably comprises means arranged to operate a circulation of the water to be treated from the additional aeration tank to the aerobic tank and the means for operating a circulation of the water to be treated from the anaerobic tank to the aerobic tank are arranged to operate a circulation of the water to be treated from the anaerobic tank to the additional aeration tank, and / or

[0060] - an element for fixing microorganisms in the anaerobic tank and / or in the aerobic tank and / or in the anoxic compartment and / or in the additional aeration tank, and / or - a means of recirculating the wastewater being treated from the aerobic tank to the anoxic compartment and / or to the additional aeration tank.

[0061] Preferably, the anoxic compartment makes it possible to further reduce the quantity of nitrogen contained in the water to be treated.

[0062] Preferably, the additional aeration tank makes it possible to further reduce the quantity of organic carbon contained in the water to be treated.

[0063] Preferably, when the water to be treated by the treatment device comes from industrial sites, agricultural operations or treatment plants, the water to be treated in the device circulates:

[0064] - in the anaerobic tank, then in the anoxic compartment and then in the aerobic tank, with, preferably, recirculation of the wastewater being treated from the aerobic tank to the anoxic compartment and then into the storage tank, or

[0065] - into the anaerobic tank, then into the additional aeration tank, preferably with recirculation of the wastewater being treated from the aerobic tank to the additional aeration tank, then into the storage tank, or

[0066] - into the anaerobic tank, then into the additional aeration tank, then into the anoxic compartment, preferably with recirculation of the wastewater being treated from the aerobic tank to the additional aeration tank and / or preferably with recirculation of the wastewater being treated from the aerobic tank to the anoxic compartment, then into the storage tank.

[0067] Preferably, the treatment device comprises means for regulating the pH of the water being treated in the aerobic tank and / or in the additional aeration tank and / or at the inlet of the anaerobic tank.

[0068] Preferably, the device comprises a means for injecting nutrient into the water being treated in the aerobic tank and / or into the additional aeration tank and / or at the inlet of the anaerobic tank. According to the invention, a method for treating and recycling water, called a treatment method, is also provided. The treatment method comprises the steps:

[0069] - anaerobic treatment of the water to be treated in an anaerobic tank, then

[0070] - circulation, by means of circulation, of the water to be treated from the anaerobic tank to the aerobic tank, then

[0071] - aerobic treatment of water to be treated in an aerobic tank.

[0072] The treatment method further comprises a step of circulating, by pumping means, the water after aerobic treatment, called treated water, from the aerobic tank to the storage tank.

[0073] The treatment method further comprises a step of filtering the treated water through the filtration membrane immersed in the aerobic tank. Preferably, the water filtration step is carried out during the step of circulating the treated water from the aerobic tank to the storage tank through the immersed filtration membrane.

[0074] The treatment method further comprises a step of injecting gas, preferably ambient air, by gas injection means, in contact with the immersed filtration membrane, into the aerobic tank.

[0075] The treatment method preferably comprises a step of providing an aerobic tank and an anaerobic tank having volumes such that a ratio between a volume of the aerobic tank and a volume of the anaerobic tank is between 15 and 0.15.

[0076] Preferably, the treatment method comprises a step of recovering and / or injecting and / or pumping the water to be treated, by recovery and / or injection and / or pumping means, into the anaerobic reservoir.

[0077] The treatment method preferably comprises a step of providing and / or maintaining and / or preserving, preferably by the means of recovery and / or injection and / or pumping and / or by the means of circulation of the water to be treated from the anaerobic tank to the aerobic tank and / or by the means of pumping the treated water from the aerobic tank to the storage tank, a ratio between a volume of water to be treated in the aerobic tank and a volume of water to be treated in the anaerobic tank of between 15 and 0.15. Preferably, the treatment device according to the invention is suitable, more preferably is particularly suitable, more preferably is designed and particularly advantageously is specially designed, to implement the treatment method according to the invention. Also any characteristic of the treatment device according to the invention is directly transposable to the treatment method according to the invention and vice versa.

[0078] Description of figures

[0079] Other advantages and particularities of the invention will appear on reading the detailed description of implementations and embodiments which are in no way limiting, and the following appended drawings:

[0080] [Fig. 1] FIGURE 1 is a schematic representation in side view of an embodiment of the water treatment and recycling device according to the invention, [Fig. 2] FIGURE 2 is a schematic representation in side view of a variant of the water treatment and recycling device according to the embodiment illustrated in FIGURE 1,

[0081] [Fig. 3] FIGURE 3 is a schematic side view representation of a variant of the water treatment and recycling device according to the embodiment illustrated in FIGURE 1.

[0082] Description of the embodiments

[0083] The embodiments described below being in no way limiting, it will be possible in particular to consider variants of the invention comprising only a selection of the described characteristics, isolated from the other described characteristics (even if this selection is isolated within a sentence comprising these other characteristics), if this selection of characteristics is sufficient to confer a technical advantage or to differentiate the invention compared to the state of the prior art. This selection comprises at least one characteristic, preferably functional without structural details, or with only a part of the structural details if this part only is sufficient to confer a technical advantage or to differentiate the invention compared to the state of the prior art.

[0084] With reference to FIGURES 1 to 3, the water treatment and recycling device 1, called treatment device 1 according to the invention, is presented.

[0085] With reference to FIGURE 1, a first embodiment of the treatment device 1 is presented which is suitable, without limitation, for non-industrial applications. Preferably, but not without limitation, the treatment device 1 according to this embodiment is suitable for individual or collective installations / housing of moderate size, such as, for example, individual houses, buildings or boats with around twenty inhabitants / users. Such a treatment device 1 according to the invention has the advantage of being compact by having a small volume or footprint.

[0086] The treatment device 1 according to this embodiment is preferably provided, but not solely and in a non-limiting manner, for water to be treated 2 having a typical Biological Oxygen Demand (BOD) of up to 350 mg / l or an admissible BOD load of between 0.05 and 1 kg / m 3 / day.

[0087] The treatment device 1 according to this embodiment is preferably provided, but not solely and in a non-limiting manner, for water to be treated 2 having a BOD / N / P ratio of 100 / 05 / 01.

[0088] The treatment device 1 comprises, in a direction of circulation of the water to be treated 2 in the device 1:

[0089] - a tank 3, called anaerobic tank 3, comprising microorganisms capable of carrying out anaerobic digestion of at least part of the phosphorus and / or nitrogen contained in the water to be treated 2, - a tank 4, called aerobic tank 4, comprising microorganisms capable of carrying out aerobic digestion of at least part of the organic matter contained in the water to be treated 2,

[0090] - a storage tank 5 for treated water after aerobic treatment.

[0091] The treatment device 1 comprises means 8 for circulating the water to be treated 2 from the anaerobic tank 3 to the aerobic tank 4. The means 8 for circulating the water to be treated 2 may further comprise an extraction pump and conduits connecting the aerobic tank 4, the pump and the anaerobic tank 3. According to the non-limiting embodiment, the means 8 for circulating the water to be treated 2 are an overflow.

[0092] The treatment device 1 also comprises means 25 for collecting and / or supplying the anaerobic tank 3 with the water to be treated 2. The means 25 for collecting and / or supplying the anaerobic tank with water to be treated 2 may be a pump, for example a lifting pump, or gravity collection and supply means.

[0093] The treatment device 1 comprises a filtration means 16. The filtration means comprise a submerged filtration membrane 10, in the aerobic tank 4. A cut-off threshold of the submerged filtration membrane 10 is less than 0.1 pm.

[0094] The filtration means 16 also comprise pumping means 9 arranged to allow circulation of the treated water, through the submerged filtration membrane 10, from the aerobic tank 4 to the storage tank 5.

[0095] The arrangement of the filtration means according to the invention makes it possible to dispense with the presence of a settling tank or clarifier. This therefore makes it possible to dispense with a flocculation step. The maintenance of the treatment device 1 according to the invention is therefore made easier and the operating costs of the treatment device 1 according to the invention are reduced.

[0096] The treatment device 1 comprises a gas injection means 7 arranged to inject ambient air into contact with the filtration membrane 10 of the filtration means 16. The filtration membrane is immersed in the aerobic tank 4.

[0097] By way of non-limiting example, the gas can be injected for 30 minutes every 90 minutes. A person skilled in the art will be able to adapt the frequency and duration of gas injection depending on the intended application. The gas can, in certain cases, be injected continuously.

[0098] The gas injection means 7 comprises diffusion means 19 arranged to produce fine and large bubbles of ambient air in the aerobic tank 4. The fine bubbles typically have a size typically less than 5 mm. The large bubbles typically have a size greater than 1 cm. The gas injection means make it possible to aerate the aerobic tank 4 so as to maintain a sufficient or excess quantity of oxygen.

[0099] The injection means 7 and / or the diffusion means 19 are arranged so that the gas bubbles are in laminar flow along the internal wall, and, preferably, along the external wall, of the immersed filtration membrane 10.

[0100] In other words, according to the non-limiting embodiment, the injection means 7 and / or the diffusion means 19:

[0101] - can be arranged inside the submerged filtration membrane 10 and in contact with the submerged filtration membrane 10,

[0102] - can advantageously be arranged outside the filtration membrane 10 and in contact with the submerged filtration membrane 10,

[0103] - can advantageously be arranged outside and below the filtration membrane 10 and / or under the bottom or under the lower wall or under the bottom wall of the submerged filtration membrane 10,

[0104] - can be advantageously arranged so that the gas bubbles (ambient air for example) are in laminar flow along one or more walls of the submerged filtration membrane 10, and / or

[0105] - may be advantageously so that the gas bubbles (of ambient air for example) diffuse or pass through, in part, the filtration membrane 10 and / or are laminar flow along one or more external walls of the submerged filtration membrane 10 and / or one or more internal walls of the submerged filtration membrane 10.

[0106] The clever combination of the gas injection means 7, the filtration means 16 and the filtration membrane 10 makes it possible to carry out constant washing of the filtration membrane 10. The friction exerted by the gas bubbles along the wall(s) of the filtration membrane 10 makes it possible to prevent the filtration membrane 10 from becoming blocked quickly while avoiding the need to provide the device 1 with dedicated washing means by using the aeration of the aerobic tank 4. This arrangement also makes it possible to limit maintenance by typically spacing the time between two interventions by 6 months. This arrangement allows the treatment device 1 to withstand suspended solids (SS) loads of at least 20 gr / l without them being likely to cause clogging.

[0107] The treatment device 1 is arranged so that a ratio between a volume of the aerobic tank 4 and a volume of the anaerobic tank 3 is between 15 and 0.15.

[0108] The particular dimensioning of the aerobic tank 4 relative to the anaerobic tank 3 according to the invention makes it possible to dispense with means of measuring and monitoring indicators, such as organic carbon, phosphorus, nitrogen, BOD or chemical oxygen demand (COD), relating to the water to be treated 2 while ensuring reliable continuous treatment of the water to be treated. This dimensioning makes it possible to simplify the treatment device 1 according to the invention. This dimensioning makes it easier to maintain the treatment device 1. The dimensioning according to the invention makes it possible to reduce operating costs. Finally, this dimensioning gives the treatment device 1 better tolerance to variations in BOD load and toxic shocks.

[0109] This arrangement of the device 1 according to the invention also makes it easier to manage, control and operate it. It is thus possible to control and / or monitor the circulation of the treated water from the aerobic tank 4 to the storage tank 5 by means of simple elements such as, for example, level sensors 30, for example floats 30. When a high or higher level is reached by the water being treated in the aerobic tank 4, a treatment unit of the treatment device 1 can be arranged to trigger the start-up of the pumping means 9. The stopping of the circulation, by the treatment unit, of the treated water from the aerobic tank 4 to the storage tank 5 is stopped when a low or lower level is reached by the water being treated in the aerobic tank 4.

[0110] Furthermore, the clever combination of the ratio between a volume of the aerobic tank 4 and a volume of the anaerobic tank 3, the arrangement of the filtration membrane 10 and the injection means 7 makes it possible to dispense with a clarifier for water treatment. Preferably, the filtration means 16 is arranged to operate an instantaneous filtration rate of between 0.0007 and 0.003 of a daily flow rate of water to be treated 2.

[0111] As a non-limiting and purely illustrative example:

[0112] - the daily flow rate of water to be treated 2 can be between 0.1 and 10,000 m 3 / day,

[0113] - for individual or personal or autonomous applications or at a private home or on board, the daily flow rate of water to be treated 2 can be between 0.1 and 34 m 3 / day,

[0114] - for collective or common or industrial applications, the daily flow rate of water to be treated 2 can be between 0.5 and 10,000 m 3 / day.

[0115] The treatment device 1 comprises, upstream of the anaerobic tank 3, relative to the direction of circulation of the water to be treated 3 in the treatment device 1, means for screening the water to be treated 2, the cut-off threshold of which is between 0.1 and 20 mm.

[0116] According to the embodiment, the screening means for the water to be treated 2 are vertical. According to the embodiment, the screening means for the water to be treated 2 are arranged so that the water to be treated 2 circulates, from the anaerobic tank 3 to the aerobic tank 4, through the screening means.

[0117] A volume of the aerobic tank 4 is greater than 1 m 3 .

[0118] According to this first embodiment, for a maximum volume of 3 m 3of water to be treated 2 per day, which represents a maximum volume for this type of installation / dwelling, the volume of the aerobic tank 4 will present maximum values ​​of the order of 20 m 3 .

[0119] Therefore, according to the first embodiment, it can be considered that the volume of the aerobic tank 4 will be between 1 and 25 m 3 .

[0120] The treatment device 1 comprises, upstream of the storage tank 5, relative to the direction of circulation of the water to be treated 2 in the treatment device 1, residual disinfection means 11 for the treated water coming from the aerobic tank 4. The residual disinfection means 11 for the treated water are arranged downstream of the aerobic tank 4 relative to the direction of circulation of the water to be treated 2 in the treatment device 1.

[0121] The residual disinfection means 11 of the treated water ensures continuous treatment of the treated water supplying the storage tank 5. By way of non-limiting example, the residual disinfection means 11 are chlorine treatment means, for example a pebble chlorination system in a channel which may include a metering pump.

[0122] Preferably, the microorganisms present in the aerobic 4 and anaerobic 3 tanks are free cultures and form activated sludge in the aerobic 4 and anaerobic 3 tanks. The operating range of this activated sludge is between 1,000 and 12,000 mg / L.

[0123] The volume of the anaerobic tank 3 is between 0.5 and 2 times a daily volume of water to be treated 2 to allow sufficient reduction.

[0124] According to an advantageous improvement of the treatment device 1 according to the invention, it is provided that the treatment device 1 is arranged to allow the recycling of rainwater.

[0125] In this case, the device comprises a means 15 for recovering rainwater arranged to collect and supply the storage basin 5 with rainwater.

[0126] The rainwater recovery means 15 comprises screening means with a cut-off threshold of between 0.1 and 5 mm.

[0127] According to an advantageous improvement of the treatment device 1 according to the invention, it is provided that the treatment device 1 produces drinking water from the water to be treated 2.

[0128] For this purpose, the treatment device 1 comprises an activated carbon filter 20 and / or a pocket filter 12 and / or a germicidal lamp 13 located downstream, relative to the direction of circulation of the water to be treated 2 in the treatment device 1, of the storage tank 5. Preferably, the pocket filter 12, the activated carbon filter 20 and the germicidal lamp 13 are located downstream of each other relative to the direction of circulation of the water to be treated 2 in the treatment device 1.

[0129] The treatment device 1 also comprises an osmosis unit 14 located downstream, relative to the direction of circulation of the water to be treated 2 in the treatment device 1, of the storage tank 5. Preferably, the osmosis unit 14 is located downstream, relative to the direction of circulation of the water to be treated 2 in the treatment device 1, of the bag filter 12, the activated carbon filter 20 and the germicidal lamp 13. The osmosis unit 14 is connected to a storage tank 26 located downstream, relative to the direction of circulation of the water to be treated 2 in the treatment device 1, of the bag filter 12, the activated carbon filter 20 and the germicidal lamp 13 and ensures continuous purification of the water contained in the storage tank 26.

[0130] With reference to FIGURES 2 to 3, improvements to the treatment device 1 according to the invention are presented. These improvements are intended to allow the treatment device 1 according to the invention to be used for applications outside the scope of the embodiment described above. In particular, this allows the treatment device 1 according to the invention to be usable in large-sized collective installations / housing, such as, for example, large-sized buildings or vessels such as ocean liners or cruise ships with up to 10,000 people. The improvements to the treatment device 1 according to the invention also make it possible to treat agricultural industrial water or water from industries.

[0131] All of the characteristics of the processing device 1 according to the embodiment described above apply to the improvements described below without them all necessarily being implemented.

[0132] The treatment device 1 according to the improvements is preferably provided, but not only and in a non-limiting manner, for water to be treated 2 having a typical Biological Oxygen Demand (BOD) of up to 350 mg / l or an admissible BOD load of between 0.05 and 1 kg / m 3 / day.

[0133] The treatment device 1 according to this embodiment is preferably provided, but not only and in a non-limiting manner, for water to be treated 2 having a BOD / N / P ratio of 100 / 05 / 01. For this purpose, the treatment device 1 according to the improvements comprises an anoxic compartment 21 whose volume is between 40% and 60% of the volume of the aerobic tank 4. The anoxic compartment 21 makes it possible to denitrify the wastewater comprising a high nitrogen concentration. As a non-limiting example, the communication from the anoxic compartment 21 to the aerobic tank 4 is carried out by gravity by means of a pipeline.

[0134] The ratio between the anoxic compartment 21 and the volume of the aerobic tank 4 makes it possible not to impact and preserve the effects produced by the ratio between the volume of the aerobic tank 4 and the volume of the anaerobic tank 3 according to the invention.

[0135] The person skilled in the art knows that an aerobic treatment is a treatment comprising a phase of oxygenation of the wastewater (in other words comprising an introduction of gaseous (dissolved) oxygen into the wastewater). The person skilled in the art knows that the oxygenation of the wastewater allows, in particular, the development of strict aerobic bacteria and aerobic bacteria, and optionally anaerobic bacteria.

[0136] The skilled person also knows that the steps of an aerobic treatment can include anaerobic phases to carry out the nitrification / denitrification steps in order to reduce the level of nitrogen present in the water. Even in this case, the treatment remains considered aerobic due to the bacterial populations selected, the absence of fermentation and the absence of I-bS production.

[0137] The treatment device 1 may also comprise an additional aeration tank 23, located upstream of the aerobic tank 4 and downstream of the anaerobic tank 3, relative to the direction of circulation of the water to be treated 2 in the treatment device 1.

[0138] The treatment device 1 comprises means 24 arranged to operate a circulation of the water to be treated from the additional aeration tank 23 to the aerobic tank 4.

[0139] In this configuration, the means 8 for circulating the water to be treated 2 from the anaerobic tank 3 to the aerobic tank 4 are arranged to circulate the water to be treated 2 from the anaerobic tank 3 to the additional aeration tank 23. The treatment device 1 comprises an element for fixing the microorganisms in the anaerobic tank 3 and / or in the aerobic tank 4 and / or in the anoxic compartment 21 and / or in the additional aeration tank 23.

[0140] The treatment device 1 comprises a means 22 for recirculating the wastewater being treated in the aerobic tank 4 and / or in the additional aeration tank 23.

[0141] The treatment device 1 may comprise a means 17 for regulating the pH of the water being treated in the aerobic tank 3 and / or in the additional aeration tank 23. The means 17 for regulating the pH is arranged to maintain a pH of the water to be treated 2 of between 6 and 8 in the anaerobic tank 3.

[0142] The treatment device 1 may comprise a means 18 for injecting nutrients into the water being treated in the aerobic tank 3 and / or in the additional aeration tank 23.

[0143] Also disclosed is a method for treating and recycling water comprising. The method for treating and recycling water comprises the steps of:

[0144] - anaerobic treatment of one to treat 2 in an anaerobic tank 3, then

[0145] - aerobic treatment of the water to be treated 2 in an aerobic tank 4, and

[0146] - circulation, by circulation means 8, of the water to be treated 2 from the anaerobic tank 3 to the aerobic tank 4,

[0147] - circulation, by means of pumping 9 the water after aerobic treatment, called treated water, from the aerobic tank 4 to a storage tank 5 of the water after aerobic treatment, called treated water.

[0148] The method comprises the step of filtering the treated water through a filtration membrane 10 immersed in the aerobic tank.

[0149] The method comprises the step of injecting ambient air, by gas injection means 7, through the submerged filtration membrane 10, into the aerobic tank 4.

[0150] The treatment method further comprises a step of providing aerobic 4 and anaerobic 3 tanks having volumes such that a ratio between a volume of the aerobic tank 4 and a volume of the anaerobic tank 3 is between 15 and 0.15.

[0151] The skilled person is familiar with the principles and objectives of aerobic, anaerobic, and anoxic treatments. Anaerobic treatment primarily contains methanogenic archaea and aims to denitrify and / or dephosphorize the water to be treated. Like anaerobic treatment, anoxic treatment's main objective is to denitrify the water to be treated, but to a greater extent. Aerobic treatment's main objective is to reduce the amount of organic carbon contained in the water to be treated.

[0152] Of course, the invention is not limited to the examples which have just been described and numerous adjustments can be made to these examples without departing from the scope of the invention.

[0153] Thus, in variants of the embodiments described above that can be combined with each other: the treatment device 1 comprises a single or single submerged filtration membrane 10 for a water column height in the aerobic tank 4 of between 80 and 200 cm, and / or the treatment device 1 comprises a double submerged filtration membrane 10 for a water column height in the aerobic tank of between 160 and 300 cm, and / or

[0154] - ventilation means 27 of the aerobic tank 4 and / or of the additional aeration tank 23, and / or

[0155] - a means of recirculating 28 the sludge from the aerobic tank 4 to the additional aeration tank 23, and / or

[0156] - the treatment device 1 comprises pumping means 25 and / or lifting 25 and / or drainage 25 and / or extraction 25 and / or collection 25, and / or the treatment device 1 comprises means 28 for supplying running water or water from a drinking water distribution system, located downstream of the storage tank 5, relative to the direction of circulation of the water to be treated 2 in the treatment device 1, and / or upstream, relative to the direction of circulation of the water to be treated 2 in the treatment device 1, of the activated carbon filter 20 and / or of the pocket filter 12 and / or of the germicidal lamp 13 and / or of the reverse osmosis unit 14.

[0157] In addition, the various features, forms, variations and embodiments of the invention may be combined with each other in various combinations to the extent that they are not incompatible or mutually exclusive.

Claims

CLAIMS 1. Water treatment and recycling device, called treatment device (1), comprising, in a direction of circulation of the water to be treated (2) in said device: - a tank (3), called an anaerobic tank, comprising microorganisms capable of carrying out anaerobic digestion of at least part of the phosphorus and / or nitrogen contained in the water to be treated, - a tank (4), called an aerobic tank, comprising microorganisms capable of carrying out aerobic digestion of at least part of the organic matter contained in the water to be treated, - a storage tank (5) for treated water after aerobic treatment, said treatment device further comprises: - means (8) for circulating the water to be treated from the anaerobic tank to the aerobic tank, a filtration means (16) comprising: • a submerged filtration membrane (10), in the aerobic tank, with a cut-off threshold of less than 0.1 pm, • pumping means (9) arranged to allow circulation of the treated water, through the submerged filtration membrane, from the aerobic tank to the storage tank, - a gas injection means (7) arranged to inject ambient air, in contact with the submerged filtration membrane, into the aerobic tank, the device being arranged so that a ratio between a volume of the aerobic tank and a volume of the anaerobic tank is between 15 and 0.

15.

2. Treatment device (1) according to claim 1, wherein a volume of the anaerobic tank (3) is between 0.5 and 2 times a daily volume of the water to be treated (2).

3. Treatment device (1) according to claim 1 or 2, wherein a volume of the aerobic tank (4) is greater than 1 m 3 .

4. Treatment device (1) according to any one of the preceding claims, wherein a water column height in the aerobic tank (4) is between 80 and 300 cm.

5. Treatment device (1) according to any one of the preceding claims, comprising, at the outlet of the anaerobic tank (3), relative to the direction of circulation of the water to be treated (2) in the device, means for screening the water to be treated, the cut-off threshold of which is between 0.1 and 20 mm.

6. Treatment device (1) according to any one of the preceding claims, wherein the gas injection means (7) comprises diffusion means (19) arranged to emit fine gas bubbles, having a size typically less than 5 mm, and large gas bubbles, having a size typically greater than 1 cm, of ambient air into the aerobic tank (4).

7. Treatment device (1) according to the preceding claim, in which the gas injection means (7) is arranged so that the gas bubbles are in laminar flow along one or more walls of the submerged filtration membrane (10).

8. Treatment device (1) according to any one of the preceding claims, comprising, upstream of the storage tank (5), relative to the direction of circulation of the water to be treated (2) in the device, residual disinfection means (11) of the treated water coming from the aerobic tank (4).

9. Treatment device (1) according to any one of the preceding claims, comprising an activated carbon filter (20) and / or a pocket filter (12) and / or a germicidal lamp (13) located downstream, relative to the direction of circulation of the water to be treated (2) in the device, of the storage tank (5) and / or a means of oxidizing the treated water contained in the storage tank.

10. Treatment device (1) according to any one of the preceding claims, comprising an osmosis unit (14) located downstream, relative to the direction of circulation of the water to be treated (2) in the device, of the storage tank (5).

11. Treatment device (1) according to any one of the preceding claims, comprising a rainwater recovery means (15) arranged to collect and supply the storage basin (5) with rainwater; the rainwater recovery means comprising screening means whose cut-off threshold is between 0.1 and 5 mm.

12. Treatment device (1) according to any one of the preceding claims, in which the filtration means (16) is arranged to operate an instantaneous filtration rate of between 0.0007 and 0.003 of a daily flow rate of water to be treated (2).

13. Treatment device (1) according to claim 3, or according to one of claims 4 to 12 taken in combination with claim 3, comprising, in the aerobic tank (4), an anoxic compartment (21) whose volume is between 40% and 60% of the volume of the aerobic tank.

14. Device according to any one of the preceding claims, comprising an additional aeration tank (23), located upstream of the aerobic tank (4) and downstream of the anaerobic tank (3), relative to the direction of circulation of the water to be treated (2) in the device; the device comprises means (24) arranged to operate a circulation of the water to be treated from the additional aeration tank to the aerobic tank and the means (8) for operating a circulation of the water to be treated from the anaerobic tank to the aerobic tank are arranged to operate a circulation of the water to be treated from the anaerobic tank to the additional aeration tank.

15. Treatment device (1) according to the preceding claim, comprising an element for fixing the microorganisms in the anaerobic tank (3) and / or in the aerobic tank (4) and / or in the anoxic compartment (21) and / or in the additional aeration tank (23).

16. Treatment device (1) according to claim 14 or claim 15 taken in combination with claim 14, comprising means for regulating the pH (17) of the water being treated in the aerobic tank (3) and / or in the additional aeration tank (23) and / or at the inlet of the anaerobic tank (3).

17. Treatment device (1) according to claim 14 or one of claims 15 or 16 taken in combination with claim 14, comprising means (18) for injecting nutrient into the water being treated in the aerobic tank (3) and / or in the additional aeration tank (23) and / or at the inlet of the anaerobic tank (3).

18. Device according to claim 14 taken in combination with claim 13, or according to one of claims 15 to 17 taken in combination with claim 13, comprising means for recirculating (22) the waste water being treated from the aerobic tank (4) to the anoxic compartment (21) and / or to the additional aeration tank (23).

19. Method for treating and recycling water comprising the steps: - anaerobic treatment of the water to be treated (2) in an anaerobic tank (3), then - aerobic treatment of the water to be treated in an aerobic tank (4), and - circulation, by circulation means (8), of the water to be treated from the anaerobic tank to the aerobic tank, - circulation, by pumping means (9) of water after aerobic treatment, called treated water, from the aerobic tank to a storage tank (5), - filtration of the treated water, through a filtration membrane (10) immersed in the aerobic tank, - injection of ambient air, by gas injection means (7), in contact with the immersed filtration membrane, into the aerobic tank; the treatment method further comprises a step of providing aerobic and anaerobic tanks having volumes such that a ratio between a volume of the aerobic tank and a volume of the anaerobic tank is between 15 and 0.15.

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