Gravity recovery module for effluent in a treatment system

Abstract

This presentation concerns a treatment system for an aqueous effluent to be purified. The system includes a gravity-fed effluent recovery module. The recovery module comprises: - an inlet to the treatment system positioned less than 20 cm from the ground supporting the treatment system, and - a lift pump to transfer the effluent recovered by gravity from the treatment system to a treatment module. Figure for the abstract: Fig. 3

Description

Title of the invention: Gravity recovery module for effluent in a treatment system technical field

[0001] The present exposition relates to the treatment of floor cleaning liquids.

[0002] More specifically, the present exposition relates to a treatment system for purifying and sanitizing liquids used by self-cleaning floor scrubbers. STATE OF THE ART

[0003] The floors of places with significant public traffic, such as train stations, airports, and shopping centers, require regular cleaning to ensure their cleanliness and prevent accidents or health problems while maintaining a clean and odorless appearance.

[0004] The large surface area of ​​the floors in these locations makes manual cleaning complicated. Therefore, it is possible to have the floors cleaned by automatic floor scrubbers.

[0005] Floor scrubbers can be of various types (self-propelled or semi-self-propelled, ride-on or manual, etc.) and sizes. The floor scrubber uses a cleaning fluid and necessarily includes a waste container to store the debris collected by the machine and the cleaning fluid. The cleaning fluid is generally water-based, sourced from a potable water supply. The used fluid, heavily contaminated by the flooring being cleaned, is stored in the waste container before being discharged from the floor scrubber into a sewer system.

[0006] The surface area of ​​the floors concerned Frequent floor cleaning and the significant use of liquid to achieve effective cleaning lead to high water consumption and therefore water waste, as the water is thrown away after use.

[0007] There is therefore a need for treatment of the liquid used by automatic scrubber machines. GENERAL STATEMENT

[0008] One aim of the presentation is to propose a simple and effective treatment of the water used by an automatic floor scrubber for cleaning a floor.

[0009] To this end, according to one aspect of this description, a system for treating an aqueous effluent to be purified is proposed, the system comprising a gravity recovery module for the effluent, the recovery module comprising:

[0010] - an inlet of the treatment system positioned less than 20 cm from the ground supporting the processing system, and

[0011] - a lifting pump for transferring the effluent recovered by gravity into the single-module treatment system for treating effluent.

[0012] Advantageously, but optionally, the described method includes at least one of the following features, taken alone or in any combination:

[0013] - the inlet includes an effluent screening basket;

[0014] - the recovery module includes an inlet receptacle of at least 50L in communication with a lift pump to empty the effluent receptacle;

[0015] - the receptacle has a bottom inclined towards a pumping zone, the zone of pumping system including a receiving cavity for a lifting pump;

[0016] - the cavity has sufficient depth to accommodate a pumping orifice of the lift pump, the cavity being configured to receive a predetermined volume of effluent representing a trigger threshold for the lift pump;

[0017] - the predetermined volume of effluent representing a trigger threshold of the the lifting pump is less than IL;

[0018] - the processing system comprising: - a settling module communicating with the recovery module via a lift pump, the settling module comprising a high siphon plate configured to separate fats from the effluent; - a configured filtration module transmits to a tank a clarified, sterilized product free of impurities larger than 1 Om; and - a tank with a volume of at least 600L.

[0019] According to another aspect, a method is proposed for implementing aqueous effluent treatment by a treatment system as previously described, the method comprising: - gravity reception of the effluent in the recovery module; - a settling of the effluent in the settling module; - a filtration of a clarified product extracted from the settling module by the module of filtering; then - storage of the clarified liquid in a tank, the clarified liquid being a reusable washing liquid in an automatic floor scrubber to clean a floor.

[0020] According to another aspect, a computer program product is proposed comprising program code instructions for the execution of the steps of the process as previously described, when this program is executed by a control unit. DESCRIPTION OF THE FIGURES

[0021] Other features, purposes and advantages will become apparent from the following description, which is purely illustrative and not limiting, and which should be read in conjunction with the accompanying drawings on which:

[0022] Fig. 1 illustrates a perspective view of a processing system.

[0023] Figure 2 illustrates a schematic diagram of a processing system.

[0024] Figure [Fig. 3] illustrates a cross-sectional view of a processing system.

[0025] Figure 4 illustrates a cross-sectional view of a settling module of a system of treatment.

[0026] Fig. 5 illustrates a cross-sectional view of a filtering module of a processing system.

[0027] Figure 6 illustrates a flowchart of the steps of a process for treating an effluent by a treatment system.

[0028] Throughout the figures, similar elements bear identical references. DETAILED DESCRIPTION

[0029] Fig. 1 illustrates a treatment system 1 for a liquid to be purified.

[0030] The liquid to be purified, or effluent, may be water or a water-based liquid, derived of a floor scrubber 2. The water or water-based liquid used in the floor scrubber 2 for cleaning a floor may or may not be potable, but is initially washing.

[0031] After use in the floor scrubber 2 to wash the floor, the water or water-based liquid is called effluent because it is a dirty liquid (or wastewater), not a cleaning agent. The effluent is stored after floor cleaning in an internal tank of the floor scrubber 2 along with the impurities and waste collected by the floor scrubber 2.

[0032] Depending on the model, the floor scrubber 2 can consume between 50L and 300L of effluent per hour to properly clean the floor on which it moves. The floor scrubber's tank can have a capacity of 100L or even 300L.

[0033] The treatment system 1 is a mini automated station that cleans the effluent and transforms it into clean, i.e., washing water, reusable in the floor scrubber 2 for cleaning the floor. A liquid is considered washing water when it does not contain Escherichia coli (or E. coli), Legionella, or enterococci.

[0034] As can be seen in [Fig.2], the treatment system 1 therefore comprises: - An effluent recovery module 3, - A settling module 4, - A filter module 5, and - A washing water tank 6.

[0035] Effluent recovery module

[0036] As shown in [Fig. 3], the effluent recovery module 3 of the treatment system 1 includes an inlet 7. The inlet 7 is a universal opening located at the bottom of the treatment system 1, which is placed on the ground. A universal opening is defined as an opening configured to receive any type of discharge hose from the floor scrubber. The inlet 7 is therefore an opening with a diameter of at least 3 cm and can be 10 cm, and preferably 5 cm. Thus, the effluent recovery module 3 can receive effluent from any type of floor scrubber 2.

[0037] The inlet 7 is positioned on the treatment system 1 less than 20 cm and preferably less than 16 cm from the ground on which the floor scrubber 2 and the treatment system 1 are placed. This positioning allows the floor scrubber 2's tank to empty itself autonomously by gravity, directly into the treatment system 1 through the inlet 7, without requiring a pump. Furthermore, the low position of the inlet 7 creates a sufficiently large vacuum between the tank and the inlet 7, thus completely emptying the tank of the effluent from the floor scrubber 2 and the debris it carries.

[0038] The treatment system 1 therefore does not require a feed pump in communication with the inlet 7 to receive the effluent and empty the scrubber-dryer 2. Furthermore, by eliminating the need for a feed pump that would empty the tank of the scrubber-dryer 2, the treatment system 1 avoids the clogging problem inherently linked to the use of a pump with an effluent laden with waste.

[0039] The inlet 7 of the treatment system 1 simplifies and facilitates, by its size, position and simplicity, the recovery of the effluent by the treatment system 1 in the scrubber-dryer 2, regardless of the type of scrubber-dryer 2.

[0040] The effluent recovery module 3 further includes a removable basket 8, or screen or sieve. The basket 8 allows for screening the effluent, i.e., retaining the largest waste particles carried by the effluent at the inlet 7 of the treatment system 1. The basket 8 may have orifices with a diameter less than or equal to 20 mm, or 6 mm (in the case of a screen), or less than 3 mm or 1 mm (in the case of a sieve). In other words, the basket 8 can retain any waste present in the effluent that is larger than the size of the orifice. The shape of the basket 8 allows it to retain a significant quantity of waste without preventing the treatment system 1 from being supplied with effluent through the inlet 7. Thus, the basket 8 can fill with waste during the effluent supply to the treatment system 1.The removable basket 8 allows for easy emptying when necessary, thus ensuring efficient effluent feeding. This removal also prevents blockages at the inlet 7 of the treatment system 1.

[0041] Furthermore, the effluent recovery module 3 includes a receptacle 9. The receptacle 9 is positioned at the bottom of the treatment system 1. Positioning the receptacle 9 at the bottom of the treatment system 1 allows the treatment system 1 to receive the effluent from the floor scrubber 2 without energy consumption. The effluent is thus received solely by gravity from the floor scrubber 2's tank to the receptacle 9. The inlet 7 communicates with the receptacle 9, in which the basket 8 is also positioned.

[0042] The receptacle 9 can have a storage volume of between 10 and 100L. Such a storage volume can allow the scrubber-dryer 2 to empty itself of effluent into the treatment system 1, allowing time for a lift pump 12 to start up to empty the receptacle 9 and transfer the effluent to the settling module 4.

[0043] The receptacle 9 has a bottom inclined towards a pumping zone 10. The inclination of the bottom of the receptacle 9 allows the effluent from the receptacle 9 to flow naturally towards the pumping zone 10, which is configured to receive the lift pump 12. Positioning the pump in the pumping zone 10 reduces the volume of effluent present in the receptacle 9 and required to trigger the lift pump 12. This is because the pumping zone 10 is the lowest part of the receptacle. The lift pump 12 includes a pumping port 121.

[0044] The pumping zone may have a cavity 11 for positioning the lifting pump 12. The cavity is therefore positioned below the level of the bottom of the receptacle 9. The cavity 11 is sufficiently large to receive the lifting pump 12.

[0045] Furthermore, the cavity 11 is sufficiently wide to accommodate a pump and sufficiently deep for the pumping orifice 121 to be within the cavity 11. Thus, the cavity 11 is deep enough to accommodate a level of effluent necessary for the activation of the lifting pump 12. In other words, the cavity 11 allows the lifting pump 12 to be received, and the pump is activated when the effluent fills the cavity 11 and reaches the level of the pumping orifice 121. The depth of the cavity 11 can be between 1 and 5 cm and preferably 3 cm.

[0046] The depth of the cavity reduces the amount of effluent that can remain in the receptacle 9 before the lifting pump 12, positioned in the pumping zone 10, is activated. In other words, only the small amount of effluent filling the cavity 11 of the pumping zone 10 can remain in the receptacle 9 without triggering the pump. The maximum volume of effluent that can stagnate in the receptacle 9 therefore corresponds to the volume of effluent contained in the cavity 11 and is less than 3 L and preferably IL.

[0047] The effluent in the receptacle 9 may be a blackish and / or odorous liquid and may carry waste smaller than 3mm.

[0048] The recovery module 3 may also include various sensors, for example to discharge the effluent present in the receptacle 9 into a sewer in case of overflow.

[0049] Thus, the recovery module 3 allows the treatment system 1 to naturally and simply receive the effluent from the floor scrubber 2 while retaining the largest debris. The recovery module 3 therefore operates without consuming any energy.

[0050] The lifting pump 12 configured to be positioned in the pumping zone 10 allows the effluent from the recovery module 3 to the settling module 4 of the treatment system 1.

[0051] Decantation module

[0052] The settling module 4 of the treatment system 1 includes the lift pump 12 positioned in the pumping zone 10 of the recovery module 3 and a settling tank 13.

[0053] The pump called the lifting pump 12 allows the effluent to be conveyed from the bottom of the treatment system 1 to the top of the settling tank 13.

[0054] As seen in [Fig.4], the settling tank 13 includes an inlet port 14, in communication with the lift pump 12, a siphon plate 15 and a settling tank 16. The settling tank 13 can receive several hundred liters of effluent such as for example between 100L and 500L and preferably 300L.

[0055] The inlet port 14 allows the settling tank 13 to be filled with effluent by the lifting pump 12. The inlet port 14 leads into the settling tank 13 on the siphon plate 15.

[0056] The siphon plate 15 separates the inlet orifice 14 from the settling tank 16 and retains the fats present in the effluent. The effluent is projected from the inlet orifice 14 onto the siphon plate 15 to improve the separation of the fats from the rest of the effluent. The siphon plate 15 is a high siphon plate, as opposed to a low siphon plate. The high siphon plate allows fats to be retained at the top and the fat-free liquid to be discharged from the bottom. In other words, the siphon plate 15 receives the effluent from the inlet port through an upper part of the siphon plate 15 (near the inlet port 14) and retains the effluent before it passes into the settling tank 16. The passage of the effluent to the settling tank 16 takes place through a lower part of the siphon plate 15 and the fats are retained by the siphon plate 15.

[0057] Next, the effluent passes between the siphon plate 15 and an outer rim 17 of a grease drain 18. The rim 17 is positioned in a lower part of the siphon plate 15 to form its bottom. The rim 17 runs along the siphon plate 15 and is continuously spaced from the siphon plate 15 by a distance of between 0.5 and 2 cm, and preferably less than 1 cm. The rim 17 retains the fats in the siphon plate and prevents their transfer to the settling tank 16. This allows the fats to then be discharged through the grease drain 18, the inlet of which is formed by the rim 17. The grease drain 18 is configured to be closed in the presence of effluent, i.e., during settling, and to open to discharge the fats only into a grease trap 19. The grease trap 19 stores the fats extracted from the effluent by the siphon plate 15 and the rim 17 of the drain 18. The grease trap 19 is removable so that it can be emptied manually when full of fats.

[0058] Thus, the siphon plate 15 allows the grease to be extracted from the effluent. The grease is therefore retained by the siphon plate 15 and does not pass into the settling tank 16. The effluent in the settling tank 16 is therefore less greasy than the effluent passing through the inlet orifice 14. By installing the siphon plate 15, the grease is collected separately in the grease trap 19.

[0059] The settling tank 16 receives the effluent after it passes through the siphon plate 15 and allows it to settle so that impurities can settle to the bottom of the settling tank 16. The settling tank 16 may have a curved shape, converging downwards to facilitate settling. Indeed, an inclination of the walls of the settling tank 16 towards the bottom accelerates settling and causes the heavier particles (in other words, those with a molar mass greater than that of the effluent in the settling tank 16) and some suspended matter to settle to the bottom of the settling tank 16. The effluent can remain in the settling tank 16 for between 1 and 5 hours. Settling is mostly completed after 2 hours. Once the settling is complete, part of the effluent located at the bottom of the settling tank 16 is heavily loaded with impurities and part of the effluent located at the top of the settling tank 16 is less loaded with impurities.The portion of the effluent located at the top of the settling tank 16, which is less loaded with impurities, is said to be clarified. The clarified portion therefore comes from the effluent from which the fats and the most significant impurities have been separated. The settling tank 16 thus includes a dirty outlet 20 and a clean outlet 21 for the discharge 18 of the portion of the effluent heavily loaded with impurities and the clarified portion.

[0060] The dirty outlet 20 is positioned in the lower part of the settling tank 16, i.e., the bottom of the settling tank 16, and allows the settling tank 16 to be emptied of the portion of the effluent heavily laden with impurities. The dirty outlet 20 includes a dewatering sock. The dewatering sock retains the impurities from the heavily laden portion of the effluent and allows the heavily laden portion of the effluent to flow into the receptacle 9. The dewatering sock fills with impurities. The dewatering sock is removable. so that it can be changed and emptied manually once full. The dirty outlet 20 thus allows the impurities separated from the effluent to be evacuated without having to manually empty the settling tank 16.

[0061] The clean outlet 21 is positioned in the upper part of the settling tank 16 and allows the clarified material to be emptied from the settling tank 16. The clarified material is drawn from the settling tank 16 through the clean outlet 21 by a filter pump 22. The clean outlet 21 is positioned in the settling tank 16 at a height that depends on the chosen settling time. Thus, the filter pump 22 can draw all the desired clarified material from the settling tank 16 and allow the portion of the effluent heavily laden with impurities to flow out through the dirty outlet 20.

[0062] An absorbent sausage can also be included in the decanter 16. The absorbent sausage is configured to float in the decanter 16 on the effluent and capture the grease particles still present on the surface of the effluent settling in the decanter 16.

[0063] The settling module 4 includes various sensors that control the activation of the lift pump 12 and the filter pump 22, the opening of the dirty outlet 20, and the grease discharge 18. Furthermore, the settling module 4 may include level sensors in the grease trap 19 and the desiccant sock to inform the user of their fill level.

[0064] Thus, the settling module 4 makes it possible to treat a large quantity of effluent and to extract the fats as well as the densest impurities which will descend by gravity to the bottom of the settling tank 16.

[0065] It is possible to provide several settling tanks 16 in series to improve settling and obtain a purer clarified product. Furthermore, connecting several settling tanks 16 in series can reduce the required settling time and increase the flow rate of effluent treatable by the treatment system 1.

[0066] Furthermore, the addition of a pressurizing device or a weighted device, such as a settling grid, can accelerate the settling process in the decanter 16.

[0067] The clarified liquid exiting the settling module 4, however, requires further purification before it can be effectively reused as a floor cleaning liquid. The clean outlet 21 therefore communicates with the filtering module 5 to allow the clarified liquid to pass through.

[0068] Filtering module

[0069] As illustrated in [Fig. 5], the filtration module system 5 completes the effluent treatment and delivers a washing liquid to the system's reservoir 6. treatment 1. The filtering module 5 is in communication with the clean outlet port 21 of the settling module 4 to receive the clarified.

[0070] The clarified material flows through the filter module 5 under the action of the filter pump 22. Various flow and pressure sensors allow the filtration of the clarified material in the filter module 5 to be adjusted.

[0071] The filter module 5 includes several filters and a UV lamp 27 in series. Among the filters of the filter module 5, the filter module 5 includes a disc filter 23, a polypropylene filter 24, an ultrafiltration filter 25 and a carbon filter 26. The filter module 5 thus makes it possible to remove the smallest impurities from the clarified water and obtain a washing liquid, i.e. configured to allow its use as a cleaning liquid in the automatic scrubber-dryer 2.

[0072] The disc filter 23 is a filtration device that removes solid impurities from clarified material, such as certain sediments, sand, and other impurities. The disc filter 23 uses a series of discs stacked one on top of the other. It can remove particles larger than 50 µm.

[0073] The polypropylene filter 24, commonly called PP or PP-h filter, further improves filtration by removing particles larger than 15pm or 1Opm from the clarified.

[0074] The ultrafiltration filter 25 improves the filtration of the clarified by removing particles with a size greater than 150vm from the clarified.

[0075] Finally, the activated carbon filter 26, positioned at the outlet of the polypropylene filter 24, also removes certain impurities still present in the clarified material. The activated carbon filter 26 absorbs the organic matter present in the clarified material. The activated carbon filter 26 thus performs chemical, or ionic or electrochemical, capture. The activated carbon filter 26 is one of the consumables of the treatment system 1 and needs to be replaced occasionally. To do this, it is necessary to visually monitor the activated carbon filter 26 and the presence of carbon residue in the tank 6 in order to replace it when its degradation indicates the need for replacement.

[0076] The filters are connected to a UV lamp 27, or ultraviolet lamp, through which the clarified material passes after filtration. The UV lamp 27 enables the sterilization of the clarified material, transforming it into a washing liquid.

[0077] Reservoir

[0078] The output of the UV lamp 27 is connected to the reservoir 6 of the treatment system 1. The reservoir 6 allows the washing liquid from the clarified material passing through the filtration module 5 to be stored in the treatment system 1. The washing liquid is stored in the reservoir 6 until it is reused for floor cleaning by a Scrubber-dryer 2. Tank 6 can have a large storage capacity, exceeding the capacity of the settling tank 16 and the receptacle 9, allowing the treatment system 1 to process the effluent from several scrubber-dryers without needing to be emptied beforehand. Tank 6 can thus store several hundred liters of cleaning liquid, for example, 1000L.

[0079] The reservoir 6 may include a drainage pump 28. The drainage pump 28 allows the washing liquid to be extracted from the reservoir 6 and transmitted outside the treatment system 1, for example to the automatic scrubber 2.

[0080] In addition, the reservoir 6 may include a recirculation pump 29. The recirculation pump 29 allows the washing liquid to be recirculated in a recirculation circuit 30 comprising a parallel UV lamp 31, which may be the same UV lamp 27 from the filter module 5. The recirculation circuit 30 further improves the purity and / or enables continuous mixing in the reservoir 6, thus ensuring good purity of the washing liquid in the reservoir 6. The recirculation pump 29 can therefore recirculate the washing liquid stored in the reservoir 6 in the UV circuit.

[0081] Processing method

[0082] The treatment system 1 is configured to implement a process for treating the effluent it receives from the floor scrubber 2, which connects to the inlet 7 of the effluent recovery module 3. The treatment process is implemented automatically by a control unit 32, which may include a PID controller, i.e., a Proportional, Integral, Derivative controller. The control unit 32 is integrated into the treatment system 1.

[0083] The treatment process includes reception steps E1, decantation E2, filtration E3 and then storage E4, as shown in [Fig.6].

[0084] The reception step El is implemented in the processing system 1 by the retrieval module 3.

[0085] The inlet 7 of the recovery module 3 autonomously receives by gravity the effluent and the waste that the effluent carries, from the tank of the automatic scrubber 2.

[0086] The effluent passes through the basket 8 which retains the largest waste and arrives in the receptacle 9. The reception of the effluent is done solely by natural gravity from the tank of the automatic scrubber 2 to the receptacle 9.

[0087] The effluent in the receptacle 9 is naturally directed towards the pumping zone 10 by the inclination of the bottom of the receptacle 9

[0088] Once the cavity 11 of the pumping zone 10 is filled with effluent, the lift pump 12 is triggered to initiate the settling stage.

[0089] The lift pump 12 is activated when the receptacle 9 fills and continues to operate until the receptacle 9, excluding cavity 11, is empty of effluent. The lift pump 12 sends the effluent from the bottom of the treatment system 1 to the top of the settling tank 13 of the settling module 4 for decantation (step E2).

[0090] The effluent is sent through the inlet orifice 14 to the siphon plate 15 and then to the settling tank 16. The effluent comes into contact with the siphon plate 15 and is thus separated from the fats, which remain on the siphon plate 15 or are retained by the outer rim 17 of the fat discharge 18. The effluent, separated from the fats, then passes between the siphon plate 15 and the rim 17 to be settled in the settling tank 16.

[0091] The settling tank 16 receives the effluent after it passes through the siphon plate 15 and allows it to settle so that the impurities settle to the bottom of the settling tank 16. Settling can last between 1 and 5 hours. Settling is generally completed after 2 hours. Once settling is complete, the clarified liquid is drawn from the settling tank 16 through the clean outlet 21 by the filter pump 22. The dirty outlet 20 is then opened to discharge the portion of the effluent located at the bottom of the settling tank 16, which is therefore heavily laden with impurities. This heavily impure-laden portion of the effluent thus passes through the dirty outlet 20 and the dewatering sock, which retains the impurities and allows the remaining liquid to flow into the receptacle 9. The dewatering sock fills with impurities.The decanter 16 is therefore emptied of the clarified through the clean outlet 21 and of the impurities and the part of the effluent heavily laden with impurities through the dirty outlet 20.

[0092] The fats present in the settling effluent E2 in the settling tank 16 can be absorbed by the absorbent boom 23 which floats in the settling tank 16.

[0093] Furthermore, after the decantation E2 the grease disposal 18 can be opened to discharge the grease into the grease trap 19.

[0094] Thus, the E2 decantation allows the extraction of fats from the effluent but also impurities which may have settled in the part of the effluent heavily loaded with impurities during the decantation.

[0095] Filtration E3 is initiated by the activation of the filter pump 22 which draws the clarified into the decanter 16 once decantation is complete.

[0096] The clarified material flows through the filter module 5 under the action of the filter pump 22. The clarified material passes through the disc filter, the polypropylene filter 24, the ultrafiltration filter 25, and finally the carbon filter. The filter module 5 thus removes even the smallest impurities from the clarified material, resulting in a washing liquid, i.e., one configured for use as a cleaning liquid in the floor scrubber 2.

[0097] Passing the clarified material through the disc filter 23 removes solid impurities present in the clarified material, such as sediments, sand, and other impurities. The clarified material exiting the disc filter 23 is therefore free of particles larger than 50 µm.

[0098] Passing the clarified through the polypropylene filter 24 further improves filtration by removing particles larger than 15pm or 1Opm from the clarified.

[0099] Passing the clarified through the ultrafiltration filter 25 allows the clarified to be removed in particles whose size is greater than 150vm.

[0100] Finally, passing the clarified through the activated carbon filter 26 also allows for the removal of certain impurities still present in the clarified by absorbing the organic matter present in the clarified.

[0101] After passing through the filters, the clarified passes through the UV lamp 27 which sterilizes the clarified to make it a washing liquid.

[0102] Once filtration E3 is complete, the washing liquid from the clarified product is stored E4 in the tank 6 until it is reused for floor cleaning by an automatic scrubber 2.

[0103] While waiting to be extracted from the reservoir 6 by the evacuation pump 18 for reuse by the automatic scrubber 2, the clarified can be recirculated in a parallel UV circuit to further improve the purity of the washing liquid.

[0104] Backwash

[0105] The treatment process may further include a backwashing step E5 of the treatment system 1. The backwashing step E5 allows the treatment system 1 to be washed in order to improve the subsequent treatment of the effluent by the treatment system 1. The backwashing E5 may be initiated once the treatment of the effluent is completed or before the treatment begins, i.e. before the effluent is received by the recovery module 3 or after the effluent has exited the filter module 5.

[0106] The backwash E5 may include the circulation of a pressurized airflow within the filter module 5, and more particularly through the disc filter 23 and the ultrafiltration filter 25. Advantageously, the air may flow through the filter module 5 in the opposite direction to the circulation of the clarified material. This allows for better cleaning of the filter module 5.

[0107] Backwashing E5 may further include reverse circulation and / or projection via a specific circuit of a volume of clarified material to clean the treatment system 1. A minimum volume of 200 L is always kept in reserve in tank 6 for this purpose so that it can be returned to the filtration module, the settling module 4 and the recovery module 3 for the clean. The clarified material used for backwashing can then also be subjected to the treatment process. It is also possible to send all the clarified material used for backwashing to the sewer system, or to send only the clarified material used at the beginning of the backwashing process, for example, for 60% of the beginning of the backwashing, and to treat the rest of the clarified material in order to reduce the amount of liquid sent to the sewer system.

[0108] Advantages

[0109] Thus, the treatment system 1, through the implementation of the recovery module 3, the settling module 4, and the filtering module 5, enables the purification of the effluent received from an automatic floor scrubber 2 into a washing liquid. Depending on the settling time in the settling module 4 and the volume of the settling tank 16, the treatment system 1 can treat several hundred liters per day.

[0110] The treatment system 1 by receiving the effluent at ground level allows the self-cleaning machine 2 to be emptied simply and autonomously, without an additional pump.

[0111] The treatment system 1 allows for the purification of the effluent without the use of chemical treatment. The various modules do not need to be connected to circuits or reservoirs 6 containing flocculant, coagulant, or disinfectant. Therefore, it is not necessary to refill the treatment system 1 with chemicals or to connect it to such circuits.

[0112] Treatment by the treatment system 1 does not complicate the work of a floor scrubber operator 2 compared to emptying the floor scrubber 2 directly into a sewer. Using the system does not change the cleaning work steps for the floor scrubber operator 2. In other words, as with a non-recycled emptying, the floor scrubber operator 2 simply needs to connect their floor scrubber 2 to the inlet 7 of the treatment system 1 instead of a sewer.

[0113] Furthermore, the operator has no contact with the effluent. Everything is automated. The treatment system 1 requires only minimal manual operation. Specifically, the basket 8, grease trap, and sludge sock need to be emptied occasionally. Additionally, the polypropylene filter 24 and the carbon filter must be replaced when they have absorbed a certain amount of organic matter. The rest of the treatment system 1 can operate autonomously.

[0114] The washing liquid stored in the tank 6, stirred and disinfected by UV continuously and is therefore reusable on demand by the operator of the automatic scrubber machine 2.

[0115] The feedback system allows the filters to be cleaned automatically with clean water at the end of the cycle and thus ensure good subsequent treatment.

[0116] Throughout the treatment system 1, overflows from the sewer system are provided to empty the treatment system in case of failure, blockage or any other malfunction.

Claims

Demands

1. A treatment system (1) for an aqueous effluent to be purified, the system comprising a gravity recovery module (3) for the effluent, the recovery module comprising: - an inlet (7) of the treatment system (1), positioned less than 20 cm from a ground supporting the treatment system (1), and - a lift pump (12) for transmitting the effluent recovered by gravity in the treatment system (1) to a module for treating the effluent.

2. Treatment system (1) according to claim 1, wherein the inlet (7) comprises an effluent screening basket (8).

3. Treatment system (1) according to any one of claims 1 and 2, wherein the recovery module (3) includes an inlet receptacle (9) of at least 50L in communication with a lift pump (12) for emptying the receptacle (9) of the effluent.

4. Processing system (1) according to any one of claims 1 to 3, wherein the receptacle (9) has a bottom inclined towards a pumping zone (10), the pumping zone (10) comprising a cavity (11) for receiving a lift pump (12).

5. Treatment system (1) according to claim 4, wherein the cavity (11) has sufficient depth to accommodate a pumping port (121) of the lift pump (12), the cavity being configured to receive a predetermined volume of effluent representing a trigger threshold of the lift pump (12).

6. Treatment system (1) according to claim 5, wherein the predetermined volume of effluent representing a trigger threshold of the lift pump (12) is less than IL.

7. A treatment system (1) according to any one of claims 1 to 6, comprising: - a settling module (4) communicating with the recovery module (3) by means of a lift pump (12), the settling module (4) comprising a high siphon plate (15) configured to separate fats from the effluent; - a filtration module (5) configured to transmit to a tank (6) a sterilized clarified product free from impurities larger than 1 Om; and

8.

9. - a tank (6) having a volume of at least 600 L. Method for implementing aqueous effluent treatment by a treatment system (1) according to claim 7, the method comprising: - a gravity reception (El) of the effluent in the recovery module (3); - a settling (E2) of the effluent in the settling module (4); - a filtration (E3) of a clarified product extracted from the settling module (4) by the filtration module (5); then - a storage (E4) of the clarified in a tank (6), the clarified being a reusable washing liquid in an automatic scrubber (2) to clean a floor. Product computer program comprising program code instructions for the execution of the process steps according to claim 8, when this program is executed by a driver unit (32).

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