FR3082515A1 - WATER TREATMENT DEVICE - Google Patents

Abstract

The water treatment device (100) comprises: - a tank (505) comprising a means (105) for aerobic biological treatment of effluents present in said tank, - a treatment unit (110), remote from the biological treatment means , which comprises: - a means (165) for producing pressurized air to supply the pressurized air to the tank, - a screen (120) for the effluents coming from the tank, - a pulsating flow pump (130) for sucking screened effluents from the tank and - a horizontal tangential filter (135), for filtering effluents from the pulsating flow pump, comprising an outlet (140) for filtered water.

Description

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a water treatment device. It applies, in particular, to the treatment of water in boats, river and maritime, dwellings or industrial or agricultural sites.

STATE OF THE ART

The treatment of black and gray water produced on a boat and fairing water is an important ecological issue. If, in the past, gray and black waters were discharged into the waters of the sea or the river on which the boat floats, new standards impose retention on board these gray and black waters.

Black water discharges participate in:

- development of algae leading to the death of living organisms and

- health risk linked to the presence of bacteria, viruses, drug residues, parasites in the water for bathers (coast, lakes ...) but also for users of drinking water through the supply networks.

In some current systems, the boat is equipped with black water recovery tanks (sewage) and emptied into dedicated port stations.

If there is not enough room, there are small tanks that are installed in a sling around the existing toilet.

These systems have the disadvantage of not being able to be used in the event of saturation. In addition, due to the emptying mechanism used, the boat can be limited in autonomy of movement.

In other current systems, the boat is equipped with a black water neutralization system by the implementation of dry toilets.

These systems also have the disadvantage of not being able to be used in the event of saturation. Indeed :

- emptying the contents into the wild (waterway or bank) is prohibited,

- emptying the contents into the trash (even in a bag) is prohibited,

- the contents of dry toilets, too dense and dry, cannot benefit from black water pumping stations.

In other current systems, the boat is equipped with means for ozonating or chlorinating the effluents after dilution of these effluents. These effluents are then discharged into the natural environment.

In other current systems, the boat is equipped with a water electrolysis device to produce active chlorine mixed with the effluents subsequently discharged into the natural environment.

Similarly, the fairing water is currently discharged into the natural environment, this rejection entailing significant ecological consequences.

Thus, today there are no systems allowing an autonomous treatment of gray and black water on board a boat and the treatment of fairing water.

OBJECT OF THE INVENTION

The present invention aims to remedy all or part of these drawbacks.

To this end, the present invention relates to a water treatment device which comprises:

- a tank comprising a means of aerobic biological treatment of effluents present in said tank,

- a treatment unit, remote from the biological treatment means, which comprises:

- a means of producing pressurized air to supply pressurized air to the tank,

- a screen for the effluents from the tank,

- a pulsating flow pump for sucking screened effluents from the tank and

- a horizontal tangential filter, to filter the effluents from the pulsating flow pump, comprising an outlet for filtered water.

Thanks to these provisions, no rejection of suspended matter is to be carried out. Thus, a boat equipped with such a device is autonomous in the treatment of water on board. In addition, this device does not present organic pollution. This device also has maximum prophylaxis, that is to say that this device does not reject viruses and bacteria. This device also makes it possible to limit the discharge of nitrates and phosphates. In addition, this device can be adapted to the processing speed of the boat. Finally, this device can be dispersed in a ship in order to present a dimensioning which does not require dedicated space in the boat, the device can be used to fill otherwise empty spaces.

The pulsating flow of the pump induces a permanent cyclic variation in the pressure exerted by the fluid on the membrane wall.

In fact, the particles are no longer permanently pressed against the membrane wall of the filtration means but on the contrary cannot mask by accumulation the membrane wall because they are periodically peeled off by the cyclic drop in pressure and entrained by the flow next. This considerably limits surface clogging and the formation of a cake.

On the other hand, the pulsating flow pump does not put the fluid in contact with the pump mechanism, which facilitates maintenance of the device. Finally, the peristaltic pump allows a reversal of the direction of the fluid by reversing its direction of rotation without additional equipment such as motorized valves or solenoid valves mounted on bypass.

Backwashing occurs by reversing the direction of rotation of the peristaltic pump. The already filtered water is in contact with the membranes which bathe in the filtered water tank.

Thus the distance to be traveled by the water laden with particles becomes half a length of fiber and unclogging is more effective. As the fibers are bathed in already filtered water, all of the walls of hollow fibers are cleaned almost homogeneously. This arrangement reduces the unclogging difficulties observed on the vertically mounted modules.

It must be taken into account that the booster is preferably made at very low pressure, less than 0.5 bar, and that backwashing is preferably carried out by suction.

This device also makes it possible to carry out water treatment for private or collective dwellings.

In embodiments, the screen includes:

- an inlet for effluents in a screening volume,

- a connecting sieve surrounding the effluent inlet in the screening volume and

- around the tubular grid, the screening volume comprising an outlet for screened effluents connected to the pulsating flow pump.

In embodiments, the screen is positioned so that the main axis of the screen is essentially vertical, the effluent inlet being positioned at the bottom of the screen.

In embodiments, the device which is the subject of the present invention comprises a level probe positioned in the tank, said probe comprising:

- a hollow tube configured to allow the passage of two electrical wires, said tube comprising a longitudinal opening at each end,

- two electrodes, each electrode being connected to an electric wire, the two electrodes projecting at least partially from a first opening of the tube,

a tubular cover made of deformable material covering at least partially each electrode fixed to the hollow tube to form, with the hollow tube, a single volume and

- a ballast fixed to the tubular cover.

Thus, when the effluents reach the deformable part of the probe, the cover comes into contact with the electrodes and pushes said electrodes into contact with one another. The detection of a current on an electrode not supplied with current in the normal state makes it possible to detect that the level probed has been reached in the tank.

In embodiments, the device which is the subject of the present invention comprises an active carbon filter for filtering the effluents from the tangential filter.

In embodiments, the device which is the subject of the present invention comprises a means for producing a reverse osmosis of the effluents coming from the tangential filter.

In embodiments, the device which is the subject of the present invention comprises:

- a reverse osmosis filter and

- a means of injecting minerals into the effluents from the reverse osmosis filter.

These embodiments make it possible to make the water at the outlet of the device suitable for consumption.

In embodiments, the device which is the subject of the present invention comprises a means of adding amendments to the effluents from the tangential filter.

These embodiments make it possible to return the water leaving the device suitable for irrigation.

In embodiments, the device which is the subject of the present invention comprises a sensor for transmittance of the effluents coming from the tangential filter and a detector for a rupture of the filter as a function of the transmittance detected.

In embodiments, the device which is the subject of the present invention comprises:

- an inlet for air in the tank and

- a distributor of bacterial flora by Venturi effect connected to an air supply line connected to the air inlet.

In embodiments, the tank includes at least one movable strainer, configured to float on stored effluents.

BRIEF DESCRIPTION OF THE FIGURES

Other advantages, aims and particular characteristics of the invention will emerge from the following non-limiting description of at least one particular embodiment of the device which is the subject of the present invention, with reference to the appended drawings, in which:

FIG. 1 schematically represents a first particular embodiment of the device which is the subject of the present invention,

FIG. 2 schematically represents a second particular embodiment of the device which is the subject of the present invention,

FIG. 3 schematically represents a particular embodiment of the deg ri Heu r of the device which is the subject of the present invention, and

- Figure 4 shows, schematically, a particular embodiment of a level probe of the device object of the present invention.

DESCRIPTION OF EXAMPLES OF EMBODIMENT OF THE INVENTION

This description is given without limitation, each characteristic of an embodiment can be combined with any other characteristic of any other embodiment in an advantageous manner. Furthermore, each parameter of an exemplary embodiment can be implemented independently of other parameters of said exemplary embodiment.

We note now that the figures are not to scale.

It is noted that the pressure values expressed below are relative pressure values with respect to the value of atmospheric pressure. Thus, a pressure called "2 bar" corresponds to an absolute pressure determined by the sum of 2 bar and atmospheric pressure instead of the device. This atmospheric pressure is close to 1 bar.

FIG. 1, which is not to scale, shows a schematic view of an embodiment of the device 100 which is the subject of the present invention. This water treatment device 100 comprises:

- a tank 505 comprising a means 105 for aerobic biological treatment of effluents present in said tank,

a treatment unit 110, remote from the biological treatment means, which comprises:

a means 165 for producing pressurized air to supply pressurized air to the tank,

- a screen 120 for the effluents from the tank,

a pulsating flow pump 130 for sucking screened effluents from the tank, and

- A horizontal tangential filter 135, for filtering the effluents from the pulsating flow pump, comprising an outlet 140 for filtered water.

The tank 505 is, for example, a tank 505 for accumulating water in a boat. This tank 505 may be pre-existing in a boat before the installation of the device 100. Conversely, the device 100 may include such a tank 505 for installation.

In variants, the device 100 comprises at least two tanks 505, each tank 505 using a processing means 105, preferably.

The tank or tanks 505 are preferably positioned so as to have an axis of symmetry coincident with the axis of symmetry of the hull of the boat, when the device 100 is placed in a boat.

Each tank 505 is sized according to daily treatment needs.

Each tank 505 preferably comprises a plate allowing the connection:

- an effluent suction pipe,

- a return flow of sucked effluents,

- a vent (not shown),

- a 510 level probe and / or

- an inlet 170 for pressurized air produced by the means 165 for producing pressurized air.

The air inlet 170 is, for example, a bubble diffuser positioned at the bottom of the tank 505. Preferably, the device 100 comprises a means 165 for producing pressurized air and a means 175 for regulating the means 165 for production of pressurized air and therefore of the bubble diffuser 170 configured, to control the periodic operation of this means 165 for producing air and of the bubble diffuser 170.

The inlet 170 of pressurized air into the tank 505 is connected, for example, by means of producing pressurized air 165. This compressed air preferably has a pressure of less than 1 bar.

This inlet 170 of pressurized air is, for example, formed by a set of narrow-mesh microporous tubes or by a set of low-pressure basin aeration stones.

The bubble diffuser is, for example, a microporous tube having a pressure on the order of 0.3 bar to deliver a large quantity of microbubbles.

The regulating means 175 is, for example, an electronic control circuit configured to issue commands for starting and stopping the bubble diffuser. In variants, the regulating means 175 is integrated into a control system of the device 100 controlling the joint or independent operation of each means of the device 100.

The use of a bubble diffuser makes it possible to produce a sequential bioreactor, that is to say a bioreactor having periods of aeration and periods of non-aeration. The alternation between aeration and non-aeration allows a complete degradation of the organic matter in the tank and makes it possible to ensure the nitrification-denitrification of this matter without release of odors.

The microorganisms used are renewed periodically by manual or automatic insertion of these microorganisms in the tank 505. This renewal is ensured, for example, every fortnight.

In embodiments, the device 100 which is the subject of the present invention comprises:

- an inlet 170 for air in the tank 505 and

- a distributor 540 of bacterial flora by Venturi effect connected to a pipe 545 for supplying air connected to the inlet 170 for air.

In embodiments, the tank 505 comprises at least one movable strainer 550, configured to float on stored effluents. In variants, each tank 505 includes a strainer 550 upstream of the effluent suction pipe. Preferably, each tank 505 has a double strainer 550.

The processing means 105 is, for example, a seeding of microorganisms, such as bacteria, suitable for fresh water or brackish or even salty water, that is to say having about 40 grams of sodium chloride (NaCl) per liter. of water. In this way, tank 505 acts as a bioreactor for an aerobic in situ reaction.

In embodiments, the device 100 which is the subject of the present invention comprises a level probe 510 positioned in the tank, said probe comprising:

a hollow tube 705 configured to allow the passage of two electric wires 710, said tube comprising an opening 715 longitudinal at each end,

- two electrodes 720, each electrode being connected to an electric wire, the two electrodes projecting at least partially from a first opening of the tube 705,

a tubular cover 725 of deformable material covering at least partially each electrode fixed to the hollow tube to form, with the hollow tube, a single volume and

- a ballast 730 fixed to the tubular cover.

An example of such a probe 510 is illustrated in FIG. 4.

The hollow tube 705 is, for example, a polyvinyl chloride tube, known by the acronym PVC, having a determined resistance to deformation by compression. This tube 705 is configured not to be deformed during immersion in the reaction medium of the tank 505.

An upper opening of the tube 705 allows the passage of two wires each connected to an electrode 720. Each electrode 720 is, for example, of any type known to those skilled in the art of level probes.

The tubular cover 725 is made, for example, of deformable material configured to be deformed by a compressive force exerted by the reaction medium on the cover 725 when this cover 725 has emerged beyond a certain predetermined extent. The compression of the cover 725 brings the electrodes 720 into contact, one of which is preferably supplied with electric current, which makes it possible to detect the presence of an electric current in the other electrode 720. Such a detection then implies that the reaction medium has reached the predetermined level. An electronic detector connected to each electric wire can thus control the actuation of the processing unit 110.

The ballast 730 is a mass fixed to the tubular cover so that the ballast drives the cover in a gravity manner towards the bottom of the tank 505.

The processing unit 110 is, for example, contained in a single casing, in two stages or dispersed in a boat and connected by a set of internal pipes.

The processing unit 110 is connected to each tank 505 by a set of air, suction, return flow circuits for aspirated effluents and cables for level probes.

The suction means 115 is, for example, a peristaltic pump, nicknamed "booster pump". This peristaltic pump is associated with a solenoid valve, or a motorized valve, or any other means for opening or closing the circulation, by tank of the device 100. This pump supplies effluents to the screen 120.

The suction means 115 successively or simultaneously sucks effluents in a plurality of tanks if the device 100 comprises a plurality of tanks.

In preferred embodiments, as shown in FIG. 1, the device 100 includes a means (not shown) for controlling the suction means 115 configured to emit successively, and iteratively:

- a suction control,

- a resting command,

- a backwash command and

- a quiescent command.

This control means is activated, for example, when a low level probe in the tank detects the presence of effluents in the tank. This control means controls the opening of a solenoid valve, or a motorized valve, connecting the tank to the suction means 115. After a determined delay, such as eight seconds for example, the suction means 115 is activated. The suction means 115 sucks the contents of the tank for a determined period, such as eight minutes. The rest is then commanded for a determined duration, such as ten seconds for example. The duration of the rest corresponds to a duration of activation or stopping of the programmed suction means 115. This duration generally corresponds to a ramp up or down. Finally, the backwashing control is configured to allow backwashing of the suction means 115 for one minute to prevent clogging of the strainers.

The control means is inhibited when the probe does not detect the presence of effluents in the tank.

This control means is, for example, a programmable electronic controller.

This peristaltic pump has, for example, a power of 100W.

In embodiments, such as that shown in FIG. 3, the screen 120 includes:

- an inlet 605 for effluents in a screening volume 610,

- a 615 connecting sieve surrounding the effluent inlet in the screening volume and

- around the tubular grid, the screening volume comprising an outlet

620 for screened effluents connected to the pulsating flow pump 130.

In variants, such as that shown in FIG. 3, the screening volume 610 may include a collector 640 intended to receive the effluents sucked upstream of the screen 615.

The 615 screen is, for example, a radial screen made of flexible material, having pores on the order of 150 micrometers. This screen, surrounding the inlet 605 for effluents in the screening volume, and possibly downstream of the collector 640, is configured to retain solids contained in the effluent stream. The flexible nature of the screen 615 is preferable, since this configuration avoids the risk of shearing of the screen 615 during backwashing.

In preferred embodiments, such as that shown in FIG. 3, the screen 120 comprises two screen supports, 625 and 630, located at two ends of the volume 610 so that the screen 615 adopts a generally tubular shape.

Preferably, the screen 120 includes a plug 635, made of PVC for example, allowing a collection of the solids contained in the sieve 615.

The outlet 620 is positioned, with respect to the inlet 605, on the other side of the screen 615.

In embodiments, the screen 120 is positioned so that the main axis of the screen 615 is essentially vertical, the inlet 605 for effluents being positioned in the lower part of the screen.

The pulsating flow pump 130, nicknamed "booster pump", is connected to the screen 120 on the one hand and to filtration means 135 on the other hand. This booster pump further comprises a bypass comprising a normally open solenoid valve and a normally closed solenoid valve. Alternatively, this pair of solenoid valves is replaced by a 3-way motorized valve.

This pulsating flow pump 130 has, for example, a power of 100W.

This pulsating flow pump 130 is, for example, equipped with a brushless motor.

In preferred embodiments, the pump 130 is configured to inject the screened effluents into the filtration means at a pressure of less than 1 bar.

In preferred embodiments, the device 100 includes a means 195 for controlling the pulsating flow pump 130 for sucking screened effluents configured to emit successively, and iteratively:

- a suction control,

- a first standby command,

- a backwash command and

- a second standby command.

This control means 195 is, for example, a programmable electronic controller.

The operating cycle of the control means 195 is, for example:

- activation of the pulsating flow pump 130 after a delay of fifteen seconds once a low level regulator contactor of the reservoir 125 is closed, the pump 130 operating for ten minutes,

- putting the pump 130 to rest for fifteen seconds,

reversing the direction of rotation for two minutes of the pump 130 to perform backwashing, this flow being sent to at least one tank via the distributor,

- Putting the pump 130 to rest for fifteen seconds.

The filtration means 135 implements, for example, a horizontal tangential filtration mechanism operating at a transmembrane pressure below a bar. Preferably, the operating pressure is between 0.2 and 0.6 bar.

The filtration means 135 preferably comprises:

- an upstream collector 205 comprising, on a lower part, an inlet 210 for screened effluents,

- a downstream collector 215 comprising, on a lower part, an outlet 220 for retentate,

a compartment 225, positioned between the upstream collector and the downstream connector, comprising at least one hollow fiber ultrafiltration module 230, this compartment comprising the outlet for filtered water, positioned on an upper part of the filtration means with respect to the inlet for screened effluents and outlet for retentate.

The upstream collector 205 is connected, for example, to the booster pump via the inlet 210 for screened effluents.

The downstream collector 215 is connected, for example, to a treatment tank via the outlet 220 for retentate.

Each manifold, 205 and 215, has, for example, a shape of a flat cylinder of revolution or a thick, hollow disc.

The compartment 225 is, for example, a volume delimited by the collectors, 205 and 215. This compartment 225 is crossed by each ultrafiltration module 230, each ultrafiltration module 230 connecting the downstream collector 205 to the upstream collector 215. In preferred embodiments, the device 100 comprises twelve ultrafiltration modules 230 whose junctions with the downstream collector 215 and the upstream collector 205 are organized in concentric circles on said collectors, 205 and 215.

Thus, the flow arrives in the upstream collector 205 at the bottom, then flows through the hollow fibers and fills the downstream collector 215. Then, the flow reaches the compartment 225 via a solenoid valve or a two-way motorized valve via the distributor. The position of inlet 210 and outlet 220 avoids any risk of accumulation of particles in the collectors, 205 and 215, and therefore in the hollow fibers.

Each ultrafiltration module 230 has, for example, a cutoff threshold of 19 nanometers. Each ultrafiltration module 230 is preferably a membrane filter. The flow through each module 230 is tangential and oriented from the inside to the outside of the membrane wall.

This filtration means 135 preferably comprises a valve 310 for discharging screened effluents upstream of the ultrafiltration module. This valve 310 is calibrated, for example, at 0.6 bars.

In preferred variants, a line connects the inlet 210 and the outlet 220 to form a junction between the two collectors, 205 and 215. This line comprises a solenoid valve, or a motorized valve, the opening of which, at the time of production backwashing of the device, allows complete cleaning of the collectors, 205 and 215.

In preferred variants, the filtration means 135 comprises an isolation valve for the upstream collector 205 and an isolation valve for the downstream collector 215.

The compartment 225 allows the collection of filtered water, the modules 230 can be immersed in the filtered water due to the positioning in the upper part of the outlet 140 for filtered water. This filtered water is used during backwashing to clean the hollow fibers of the ultrafiltration modules 230.

Each ultrafiltration module 230 is separated from the collectors, 205 and 215, respectively by a perforated PMMA (poly methyl methacrylate) plate. Each hole allows the attachment of an ultrafiltration module 230. This fixing is made waterproof by the use of a flexible polymer seal.

Each ultrafiltration module 230 is fixed to the collectors, 205 and 215, by the use of two flanges connected by at least one threaded rod passing through said module 230. Each flange has, for example, a shape of a circle crossed by two bands diametral and these bands being preferably perpendicular to each other. A first flange is positioned on the side of the upstream collector 205, and another flange is positioned on the side of the downstream collector 215. The upstream collector 205 is secured to a plate which carries the modules 230. Thus, the disassembly of the downstream collector 215 allows quick access to 230 modules.

Preferably, at least one module 230 is an electrically neutral hollow fiber filter. Preferably, the permeability of the fibers used in each ultrafiltration module is of the order of 800L / m ² / bar.

In embodiments, the device 100 which is the subject of the present invention comprises an active carbon filter 145 for filtering the effluents from the tangential filter.

The activated carbon filter 145 is, for example, contained in a completely waterproof polycarbonate or polyethylene container. This container has a low point of arrival of filtered water and a high point of exit of treated water. This filter 145 operates in a gravity manner.

Preferably, the inlet and outlet of the filter 145 are protected by a large-volume strainer made up of a perforated tube covered with a polymeric sieve, the roughness of which has a dimension of about three hundred micrometers.

In variants, the device 100 includes a direct line between the downstream collector 215 and the upstream collector 205. In this way, during backwashing, the suction of the particles in these collectors, 205 and 215, is facilitated.

In embodiments, the device 100 which is the subject of the present invention comprises a means 515 for producing a reverse osmosis of the effluents from the tangential filter.

In embodiments, the device 100 which is the subject of the present invention comprises:

- a reverse osmosis filter and

- a means 520 for injecting minerals into the effluents from the reverse osmosis filter.

In embodiments, the device 100 which is the subject of the present invention comprises a means 525 for adding amendments to the effluents from the tangential filter.

In embodiments, the device 100 which is the subject of the present invention comprises a sensor 530 for transmittance of the effluents from the tangential filter 135 and a detector 535 for a filter rupture as a function of the transmittance received.

The sensor 530 is configured to measure a light intensity passing through a flow leaving the filter. This luminous flux is preferably emitted by a light emitter (not shown) through the flux leaving the filter.

When the light transmittance is less than a determined limit value, the detector 535 determines that a filter break has occurred.

The detector 535 is, for example, an electronic measurement circuit associated with the sensor 530.

In embodiments, the device 100 includes means for communicating the detection of a detected failure.

This means of communication is, for example, an antenna configured to transmit a signal representative of the detection of a failure on a data network. This data network is, for example, a mobile data network of GSM type (for "Special Mobile Group") or a network of machine to machine type.

In variants, this means of communication emits a signal representative of at least one captured transmittance.

In preferred embodiments, as shown in FIG. 1, the device 100 includes a reserve 150 of water, connected to the outlet of the activated carbon filter.

The water reserve 150 is, for example, a reservoir separate from the internal volume of the compartment 225. In variants, this water reserve 150 is formed by the internal volume of the compartment 225.

In variants, the water reserve 150 includes an outlet for water (not referenced) to the natural environment around the device 10.

In variants, the water reserve 150 includes an outlet for water connected to an ultraviolet filter 315 and to a booster 320, the water thus released being moved to an outlet for possible reuse.

In variants, the water reserve 150 includes an inlet 325 for additional water coming from a water distribution network. The supply of water through the inlet 325 can be conditioned on the signaling of the absence of water by a probe (not shown) positioned in the reserve 150, preferably in the lower part.

These embodiments are implemented, for example, on careening sites, industrial sites or agricultural sites.

In preferred variants, the device 100 includes an electrical protection, management and regulation box which comprises:

- bodies for the protection of persons and electrical equipment,

- load relays,

- each programmable controller and

- electronic control boards for controlling the peristaltic pump motors.

Thus, as we understand, the bioreactor, formed by the tanks and the biological treatment means 105, is coupled to the self-maintained screen 120 then by means of ultrafiltration 135 allowing no bacteria, no virus and no suspended matter to pass through. . Thus, the water treated by the device 100 is sterile at the outlet of the membrane and does not present any danger either to the environment or to humans. The treated water conforms to the so-called "improved bathing water" quality, that is to say that it does not contain microorganisms.

All the water remaining upstream of the filtering membrane is gradually degraded by the biological treatment means 105.

The filters of device 100 are self-maintained by the action of programmed backwashes, these backwashes being ensured by the reverse circulation of the water treated by device 100.

The device 100 can be implemented in the context of a home or for any system requiring the recovery of filtered water from water unfit for consumption or discharge into the natural environment. Alternatively, the device 100 can be implemented in the context of an industrial, agricultural or commercial operation in order to treat the effluents characteristic of these operations.

As can be understood from reading this description, the device 100 can either be dispersed in a boat, or on the contrary integrated into a container and have only inlets and outlets for attachment to an existing system. This container can have, for example, a length of twenty feet or forty feet in applications for the treatment of effluent from fairings, industrial or agricultural.

Alternatively, the device 100 can be positioned on a pallet (translated by “skid”, in English) so as to be made mobile. This alternative 15 is particularly intended to be implemented in the context of dwellings.

Claims (11)

1. Device (100) for water treatment, characterized in that it comprises: - a tank (505) comprising a means (105) for aerobic biological treatment of effluents present in said tank, - a treatment unit (110), remote from the biological treatment means, which comprises: - means (165) for producing pressurized air to supply pressurized air to the tank, - a screen (120) for the effluents from the tank, - a pulsating flow pump (130) for sucking screened effluents from the tank, and - A horizontal tangential filter (135), for filtering the effluents from the pulsating flow pump, comprising an outlet (140) for filtered water. 2. Device (100) according to claim 1, in which the screen (120) comprises: - an inlet (605) for effluents in a screening volume (610), - a sieve (615) connecting surrounding the inlet for effluents in the screening volume and - around the tubular grid, the screen volume comprising an outlet (620) for screened effluents connected to the pump (130) with pulsating flow. 3. Device (100) according to claim 2, wherein the screen (120) is positioned so that the main axis of the screen (615) is essentially vertical, the inlet (605) for effluents being positioned in the lower part of the bar screen. 4. Device (100) according to one of claims 1 to 3, which comprises a level probe (510) positioned in the tank, said probe comprising: - a hollow tube (705) configured to allow the passage of two electric wires (710), said tube comprising an opening (715) longitudinal at each end, - two electrodes (720), each electrode being connected to an electric wire, the two electrodes projecting at least partially from a first opening of the tube, a tubular cover (725) made of deformable material covering at least partially each electrode fixed to the hollow tube to form, with the hollow tube, a single volume and - a ballast (730) fixed to the tubular cover. 5. Device (100) according to one of claims 1 to 4, which comprises a filter (145) with active carbon to filter the effluents from the tangential filter. 6. Device (100) according to one of claims 1 to 5, which comprises means (515) for producing a reverse osmosis of the effluents from the tangential filter. 7. Device (100) according to one of claims 1 to 6, which comprises - a reverse osmosis filter and - a means (520) of injecting minerals into the effluents from the reverse osmosis filter. 8. Device (100) according to one of claims 1 to 7, which comprises means (525) for adding amendments to the effluents from the tangential filter. 9. Device (100) according to one of claims 1 to 8, which comprises a sensor (530) for transmittance of the effluents from the tangential filter (135) and a detector (535) of a filter rupture as a function of the transmittance received. 10. Device (100) according to one of claims 1 to 9, which comprises: - an inlet (170) for air in the tank (505) and - a distributor (540) of bacterial flora by Venturi effect connected to a pipe (545) of air supply connected to the air inlet. 11. Device (100) according to one of claims 1 to 10, in which the tank (505) comprises at least one movable strainer (550), configured to float on stored effluents.