Equipment for treating wastewater from toilets, and sanitary units equipped with such equipment.

Abstract

An installation (5) for treating wastewater from a WC (3), comprising a solid-liquid separation filter (25) and a liquid recirculation circuit (27) for conveying liquid from the solid-liquid separation filter (25) to a tank (11). The installation (5) comprises a solid-liquid separation filter (25) having an inlet intended to be connected to a toilet bowl, a solid-liquid separation module, a first outlet connected to a drain pipe (30) and a second outlet connected to the recirculation circuit, the solid-liquid separation filter (25) conveying solids to the first outlet and liquids to the second outlet, the recirculation circuit comprising a filtration assembly configured to make the liquid reusable.

Description

Technical Field

[0001] The present invention relates to a facility for treating wastewater from a toilet and a sanitary unit equipped with such a facility.

Background Art

[0002] In the field of sanitary facilities, controlling water consumption has repeatedly been a problem, and its impact is both economic and ecological. More specifically, in the field of toilets or flush toilets, hereinafter referred to in this specification by the abbreviation "WC", due to the increase in the world population, the number of people who can use WCs equipped with a flushing system is constantly increasing worldwide.

[0003] As an attempt to suppress such consumption, many prior art solutions aim to reduce the amount of water required for the operation of the flushing system.

[0004] Another prior art solution is the solution mentioned in document US5045188, which provides a facility including a complete sanitary unit further including a WC and a circuit for recycling wastewater from the WC.

[0005] [[ID=2۳]] However, such units have several drawbacks.

[0006] First, the design of the wastewater treatment facility is particularly complex.

[0007] This facility further includes a tank attached under the WC toilet, and thus has no compatibility with existing WCs.

[0008] And solids are collected in the tank, and this tank is emptied manually. Therefore, there is no automatic connection to the discharge pipe for discharging solids.

[0009] Also, the filters used do not guarantee sufficient water quality of the water recovered at the outlet of the recirculation circuit.

[0010] Furthermore, this equipment is not connected to an external water inlet.

[0011] Finally, the WC's functionality is not guaranteed during a power outage, and power is required for installation work. [Overview of the project]

[0012] The present invention aims to overcome the aforementioned drawbacks and, for this purpose, relates to equipment for treating wastewater from toilets, comprising the following: - A solid-liquid separation filter to be installed at the outlet of a toilet bowl in a WC, and - A liquid recirculation circuit is positioned to transport the liquid from the solid-liquid separation filter to the main tank of the WC. The equipment is characterized by including at least the following solid-liquid separation filters: - An entrance for connecting to the toilet bowl exit of the WC. - A solid-liquid separation module configured to separate solids from liquids. - First outlet for connection to the inlet of the discharge pipe, - A second outlet connected to the liquid recirculation circuit. The solid-liquid separation filter is configured to transport solid material from the solid-liquid separation module to a first outlet and to transport liquid material from the solid-liquid separation module to a second outlet. The equipment is further characterized in that the liquid recirculation circuit includes a filtration unit, and the filtration unit is configured to allow the liquid to be reused after it has passed through the filtration unit.

[0013] This allows the equipment of the present invention to be installed in existing toilets by equipping it with a solid-liquid separation filter that includes an inlet for connecting to the outlet of the toilet bowl in the toilet.

[0014] The choice of toilet is left to the user, but installation is significantly simplified.

[0015] "Reusable water" refers to water quality that meets local standards for use in flushing. Requirements may vary from country to country. While this invention makes it possible to obtain reusable water, i.e., water suitable for consumption, as needed, it should be noted that such a water quality level is not necessary to ensure the functionality of flushing.

[0016] As a result, the manufacturing costs of the equipment are optimized.

[0017] Furthermore, by equipping the recirculation circuit with a filtration unit configured to allow the reuse of the liquid discharged from the solid-liquid separation filter, it becomes possible to set up a closed circuit, which significantly reduces the amount of water required to operate a toilet equipped with the equipment of the present invention.

[0018] According to any feature of the equipment of the present invention: - The filtration unit of the liquid recirculation circuit comprises a pre-filtration system and an ultrafiltration system installed in series. Therefore, a filtration unit can be obtained that is configured to allow the reuse of the water at the outlet of the ultrafiltration system, in a particularly simple manner; -In one embodiment, the solid-liquid separation filter further includes a housing in which a solid-liquid separation module is mounted, the solid-liquid separation module being a rotating screen controlled by an electric motor; -In one embodiment, the solid-liquid separation filter includes a cleaning nozzle for cleaning a rotating screen, and the equipment includes a cleaning pipe, one end of which is connected to the cleaning nozzle and the other end of which is connected to a water inlet. By directly connecting the solid-liquid separation filter to the water inlet, the cleaning of the solid-liquid separation filter is optimized; -In one embodiment, the equipment includes a storage tank for the liquid supplied from a second outlet of a solid-liquid separation filter, and a hydraulic pump positioned to extract the liquid contained in the storage tank; - In one embodiment, the facility includes a system for discharging a liquid substance from a storage tank, the system including a pre-filter pipe connecting the storage tank to a pre-filter system, a drain pipe connected to the pre-filter pipe and for connecting to a discharge pipe, and a unit disposed within the facility for controlling the direction of flow of the liquid substance for conveying the liquid substance from the storage tank to the discharge pipe; - In one embodiment, the facility includes a backwash system for the pre-filter system, including a pre-filter pipe to which the pre-filter system is connected, a wash pipe connected to the pre-filter system and for connecting to a water inlet, a drain pipe connected to the pre-filter pipe and for connecting to a discharge pipe, and a unit disposed within the facility for controlling the direction of flow of water for conveying water from the water inlet to the pre-filter system and then from the pre-filter system to the discharge pipe; - In one embodiment, the storage tank includes an upper cover having an opening for receiving a second outlet of a solid-liquid separation filter; - In one embodiment, the solid-liquid separation filter includes two arms for attaching a pre-filter system and an ultrafiltration system.

[0019] The present invention further relates to a sanitary unit, characterized by comprising the following: - A WC including a WC toilet and a flushing system, the flushing system comprising a main tank, the main tank being connected to a water inlet and a WC bowl, the WC; - The facility according to the present invention for treating the wastewater of the WC.

Brief Description of the Drawings

[0020] Other features, objects, and advantages of the present invention will become apparent from the following description, which will be assisted by the accompanying drawings: [Figure 1] FIG. schematically shows the sanitary unit according to the present invention in an isometric view from the back side. [Figure 2] FIG. shows the solid-liquid separation filter of the present invention. [Figure 3]It is an enlarged view of Region III shown in FIG. 2. [Figure 4] It is an enlarged view of Region IV shown in FIG. 2. [Figure 5] It is a diagram schematically showing the sanitary unit of the present invention in an isometric view from the back side. [Figure 6] It is a fluid circuit diagram of the sanitary unit of the present invention. [Figure 7] It is a diagram showing an embodiment of the arrangement between the solid-liquid separation filter and the storage tank of the equipment of the present invention.

Mode for Carrying Out the Invention

[0021] In all the figures, the same or similar reference numerals indicate the same or similar elements or aggregates of elements.

[0022] Referring to FIG. 1, the sanitary unit 1 according to the present invention is schematically shown in an isometric view from the back side.

[0023] The sanitary unit 1 includes a flush toilet 3 designated by the initials "WC" in the following part of this specification and in the claims, and equipment 5 for treating the wastewater of the WC 3.

[0024] The WC 3 includes a toilet bowl 7 and a flushing system 9. The flushing system 9 includes a main tank 11 as is well known. The main tank 11 is supported by a frame 13 attached behind a partition 15 that partitions the toilet bowl 7 from the flushing system 9. The flushing system 9 is not visible to the user. The main tank 11 is connected to a water inlet 17 via a water inlet pipe 19 and to the toilet bowl 7 via a flow pipe 21. A supply valve 23, such as an electrically controlled fluid valve, is attached to the water inlet pipe 19 to control the supply of water to the main tank 11 via the water inlet 17. <00​The main tank 11 includes a float valve system 24 (see Figure 6), the operation of which is well known to those skilled in the art. When the flushing system 9 is activated, a flap located at the bottom of the main tank 11 opens, releasing the water contained in the main tank 11, which flows into the toilet bowl 7 via the flow pipe 21. Subsequently, the float valve system detects a drop in the water level in the main tank 11 and opens the water inlet 17 until the water reaches a predetermined level initially set when the toilet was installed.

[0026] According to the present invention, the wastewater treatment facility 5 of WC3 includes a solid-liquid separation filter 25 and a liquid recirculation circuit 27.

[0027] The solid-liquid separation filter 25 is connected to the outlet 29 of the toilet bowl 7 and is interposed between the outlet 29 and a discharge pipe 30 (see Figure 6) that can be connected to a sewer pipe. The solid-liquid separation filter 25 is designed to separate solid matter from the liquid matter flushed from the toilet bowl 7 when the flushing system 9 is in operation. The solid-liquid separation filter 25 connects the outlet 29 of the toilet bowl 7 to the discharge pipe 30 and also connects the outlet 29 to the liquid recirculation circuit 27. By design, the solid-liquid separation filter 25 separates solid matter from the liquid that carries the solid matter, transports the separated solid matter to the discharge pipe 30, and transports the liquid from which the solid matter has been separated to the liquid recirculation circuit 27.

[0028] Refer to Figure 2, which shows an example of an embodiment of the solid-liquid separation filter 25.

[0029] The solid-liquid separation filter 25 includes a housing 31 in which a solid-liquid separation module 33 is mounted. The housing 31 is actually composed of two half-casings that are molded and assembled together, for example. In Figure 2, only one of the two half-casings is shown so that the inside of the filter 25 is visible.

[0030] The filter 25 includes an inlet 35 connected to the outlet 29 of the toilet bowl 7 of WC3 and functions as a drain leading to the solid-liquid separation module 33. Therefore, the inlet 35 has an inclined section 37 for allowing solids and liquids to flow from the toilet bowl 7 to the solid-liquid separation module 33.

[0031] According to an example of the embodiment of the filter 25 shown in Figure 2, the solid-liquid separation module 33 is formed by a rotating screen 39 controlled by a motor 40 (see Figure 6), for example, an electric motor. The rotating screen 39 has a cylindrical perforated sheet 41 that is rotated around a rotation axis 43 by an electric motor.

[0032] The rotation of the cylindrical perforated sheet moves the solid material from the inlet 35 to the first outlet 45 of the solid-liquid separation filter 25. The first outlet 45 is connected to a discharge pipe 30 (see Figure 6) which can be connected to a sewer pipe. The first outlet 45 has an inclined section 47 for allowing the solid material to flow from the solid-liquid separation module 33 to the discharge pipe 30.

[0033] The solid-liquid separation filter 25 has a second outlet 49 connected to a liquid recirculation circuit 27 (see Figure 1). The solid-liquid separation filter 25 is designed to transport liquid from the separation module 33 to the second outlet 49. For this purpose, the second outlet 49 is located beneath a cylindrical perforated sheet 41 so that the liquid flowing from the inlet 35 flows by gravity through the perforated screen 41 from the inlet 35 to the second outlet 49 and is supplied to the liquid recirculation circuit 27 (see Figure 1).

[0034] It should be noted that the solid-liquid separation module 33 can be manufactured by a separation system suitable for separating solids from liquids, as is known to those skilled in the art, particularly by, for example, a centrifugal separator system.

[0035] The solid-liquid separation filter 25 may include a cleaning nozzle 51, which is connected to a water inlet 17 (see Figure 1) by a cleaning pipe 53. A cleaning valve 55 (see Figure 1), such as an electrically controlled fluid valve, is attached to the cleaning pipe 53 to control the water supply to the cleaning nozzle 51 via the water inlet 17. The cleaning nozzle 51 is mounted inside a rotating screen 39.

[0036] As shown in Figure 3, which is an enlarged view of area III in Figure 2, the cleaning nozzle 51 is fixed to the shaft 57 of the filtration module and generally has a cylindrical shape. The nozzle 51 has a set of holes 59 distributed around its circumference to spray water onto the rotating screen for cleaning.

[0037] In one embodiment of the solid-liquid separation filter 33 shown in Figure 4, the housing 31 includes a scraping inclined section 61 located inside it between a first outlet 45 and a second outlet 49. As a result, when the screen 39 is rotated by the motor, any solid material remaining on the outer wall 63 of the screen is discharged to the first outlet 45 the moment the screen comes into contact with the scraping inclined section 61, and then sent to the discharge pipe.

[0038] In another embodiment, the filter 25 includes a small centrifuge, or a filter mat, or a rotary screen filter such as a drum rotary filter or a fixed screen filter.

[0039] Next, in order to explain the liquid recirculation circuit 27 of equipment 5, we will refer to Figure 5, which shows the sanitary unit 1 from the rear side using isometric projection, and Figure 6, which shows the fluid circuit of the sanitary unit.

[0040] The liquid recirculation circuit 27 is located in the facility to transport the liquid flowing from the solid-liquid separation filter 25 to the main tank 11 of WC3, allowing the liquid recovered by the filter 25 to be reused.

[0041] Therefore, the liquid recirculation circuit 27 includes a filtration unit 65, which allows the liquid flowing from the solid-liquid separation filter 25 to pass through the filtration unit 65, thereby making the fluid reusable.

[0042] For this purpose, the filtration unit 65 includes a pre-filtration system 67 and an ultrafiltration system 69, which are mounted in series with each other.

[0043] The pre-filtration system 67 performs the initial filtration of the liquid to be purified that flows from the solid-liquid separation filter 25.

[0044] As an example, the pre-filtration system 67 includes a cartridge filter, such as those used in swimming pools. Such a filter ensures the filtration of particles with a minimum size equal to 50 micrometers; that is, such a filter does not retain particles smaller than 50 micrometers. Preferably, the filter ensures the filtration of particles with a minimum size of 5 micrometers. The filter is, for example, a pleated cartridge filter made of 5-micrometer polypropylene or 5-micrometer polyester. In a variation, the filter is a media filter. The filter may be a filter loaded with media suitable for filtering particles with a minimum size equal to 5 micrometers. In a variation, the media filter is an activated carbon filter that filters particles with a minimum size of 5 micrometers. Any other type of filter suitable for particles contained in a liquid and making the liquid usable does not deviate from the scope of this application.

[0045] The ultrafiltration system 69 provides a second filtration of the liquid to be purified, which flows from the solid-liquid separation filter 25 and then from the pre-filtration system 67.

[0046] The ultrafiltration system 69 can be obtained by a membrane ultrafilter, such as filters used in the food industry and in the medical field for blood filtration.

[0047] For example, the ultrafiltration system includes a pleated cartridge filter made of polypropylene suitable for filtering particles with a minimum size of 0.2 micrometers, or a glass fiber membrane suitable for filtering particles with a minimum size of 0.2 micrometers, or a polyester filter suitable for filtering particles with a minimum size of 0.2 micrometers. In a modified example, the ultrafiltration system further or alternatively includes an ozone treatment and / or reverse osmosis system.

[0048] Preferably, filter 25 is a rotating screen filter, the filter of the pre-filtration system 65 is a 5-micrometer activated carbon filter, and the ultrafiltration system is a 0.2-micrometer pleated cartridge membrane filter.

[0049] When the liquid flowing from the solid-liquid separation filter 25 first passes through the pre-filtration system 67 and then the ultrafiltration system 69, the resulting liquid was found to be reusable water that meets the strictest hygiene standards enforced in some countries.

[0050] This allows the water from the filtration device 65 to be transported to the main tank 11 of the WC3.

[0051] The liquid recirculation circuit 27 is located in the facility 5 to transport the liquid flowing from the solid-liquid separation filter 25 to the main tank 11 via the filtration unit 65.

[0052] Equipment 5 includes a tank 71 for storing liquids, which is attached to the outlet of the solid-liquid separation filter 25, and the liquids are supplied through a second outlet 49 of the separation filter 25.

[0053] As shown in Figure 7, the tank 71 for storing the liquid may have a parallelepiped shape overall and include an upper cover 66 having an opening 68 sized to receive the second outlet of the solid-liquid separation filter 25. The solid-liquid separation filter 25 may include two mounting arms 70, 72 for mounting a pre-filtration system 67 and an ultrafiltration system 69, respectively.

[0054] Refer again to Figures 5 and 6.

[0055] The capacity of the storage tank 71 is preferably larger than the capacity of the main tank 11. The presence of a storage tank of such capacity, directly connected to the second outlet 49 of the separation filter 25, allows for partial use of the equipment of the present invention even when the equipment is not connected to a power source, such as in the event of a power outage. In fact, during a power outage, the solid-liquid separation filter 25, which is driven by an electric motor, no longer functions. However, solids continue to slide, albeit slowly, from the inlet 35 of the solid-liquid separation filter 25 to the first outlet 45 by gravity. Meanwhile, liquids continue to descend by gravity to the second outlet 49 of the solid-liquid separation filter 25, and the liquids are transported to the storage tank 71 where they are stored, even during a power outage. Furthermore, the storage tank 71 may include two overflow pipes 73 connected to the second outlet 49 of the solid-liquid separation filter 25. As a result, if the power outage is prolonged, the liquids can be transported to a discharge pipe 30 that can be connected to a sewer pipe.

[0056] The liquid is transported from the storage tank 71 to the inlet of the filtration unit 65 via a pre-filtration pipe 75 that connects the storage tank 71 to the pre-filtration system 67.

[0057] A hydraulic pump 77 attached to the pre-filtration pipe 75 extracts liquid from the storage tank 71 so that the liquid moves within the pre-filtration pipe 75.

[0058] The hydraulic pump 77 is selected so that the pressure when the liquid extracted from the storage tank 71 flows through the pre-filtration system 67 and the ultrafiltration system 69 is sufficient for the proper functioning of the system. To reduce the size of the hydraulic pump 77, it is conceivable to install an additional hydraulic pump at the outlet of the ultrafiltration system 69.

[0059] A backflow prevention valve 79 is installed at the outlet of the hydraulic pump 77, allowing fluid to flow from the hydraulic pump 77 to the pre-filtration system 67.

[0060] A pre-filtration valve 81, for example, an electrically controlled hydraulic valve, is optionally installed in the pre-filtration pipe 75 between the hydraulic pump 79 and the pre-filtration system 67.

[0061] A drain pipe 83, installed between the backflow prevention valve 79 and the pre-filter valve 81, connects the pre-filter pipe 75 to the discharge pipe 30. The drain pipe 83 is fitted with a drain valve 85, such as an electrically controlled hydraulic valve.

[0062] Furthermore, the ultrafiltration pipe 87 connects the pre-filtration system 67 to the ultrafiltration system 69 so that the ultrafiltration system 69 is mounted in series with the pre-filtration system 67, in order to transport liquid from the pre-filtration system 67 to the ultrafiltration system 69.

[0063] An ultrafiltration valve 89, such as an electrically controlled hydraulic valve, is attached to the ultrafiltration pipe 87 between the pre-filtration system 67 and the ultrafiltration system 69.

[0064] A cleaning pipe 91, installed between the pre-filtration system 67 and the ultrafiltration valve 89, connects the pre-filtration system 67 to the water inlet 17.

[0065] A backflow prevention valve 93 and a flush valve 95, such as an electrically controlled hydraulic valve, are installed on the flush pipe 91. The backflow prevention valve 93 is installed on the flush pipe 91 so that fluid flows from the water inlet 17 to the ultrafiltration pipe 87.

[0066] Finally, the return pipe 97 connects the ultrafiltration system 69 to the main tank 11. This forms a closed circuit in the liquid recirculation circuit 27.

[0067] Different components of the equipment 5 are controlled by a programmable control unit (not shown), which may be part of or outside of the equipment 5. The programmable control unit is configured, in particular, to manage the state changes of valves 23, 55, 81, 85, 89, and 95, to control the triggering of motor 40 and the starting of hydraulic pump 77, and to operate the pre-filtration system 67 and the ultrafiltration system 69.

[0068] The operation of sanitary unit 1 is as follows:

[0069] When the user activates the flushing system 9, water stored in the main tank 11 flows into the toilet bowl 7 through the flow pipe 21.

[0070] Substances present in the toilet bowl are extracted from the toilet bowl 7 via outlet 29.

[0071] Subsequently, the motor of the solid-liquid separation filter 25 operates, controlling the rotation of the screen 39. This allows the substances in the toilet bowl 7 to be filtered for the first time. The solids are carried to the first outlet 45 of the filter 25, and then to the discharge pipe 30 connected to the sewer pipe. The liquid flows through the screen of the separation filter 25 and descends by gravity to the second outlet 49 until the liquid reaches the storage tank 71.

[0072] The hydraulic pump 77 is activated, for example, at the end of a predetermined time between 5 and 10 seconds. The hydraulic pump 77 then extracts the liquid from the storage tank 71, thereby moving the liquid to the pre-filtration pipe 75. The liquid flows through the backflow prevention valve 79 and then through the normally open pre-filtration valve 81. The normally closed drain valve 85 prevents the liquid from flowing through the drain pipe 83 connected to the discharge pipe 30 at this stage. As a result, the liquid reaches the pre-filtration system 67, where a second filtration takes place.

[0073] The normally open ultrafiltration valve 89 allows the liquid flowing from the pre-filtration system 67 to flow through the ultrafiltration pipe 87, while the backflow prevention valve 93 prevents the liquid flowing from the pre-filtration system 67 from flowing through the wash pipe 91. The liquid then reaches the ultrafiltration system 69 and undergoes a third filtration to obtain reusable water.

[0074] The reusable water is then transported to the main tank 11 via the return pipe 97.

[0075] The equipment 5 is sequenced so that the supply valve 23 closes immediately after the flushing system 9 is activated. The supply valve 23 returns to its open state when the main tank 11 is filled with reusable water transported by the return pipe 97. The float valve system 24, connected to the supply valve 23, resumes its function when the supply valve 23 is open. In this way, the float valve system compensates for any shortage of water in the tank that may result from losses inherent in the function of the sanitary unit.

[0076] According to the configuration of the present invention, when the washing system 9 is activated, the control unit opens the washing valve 55 to wash the solid-liquid separation filter 25. In this way, water flowing from the water inlet 17 reaches the washing nozzle 51 via the washing pipe 53. The washing nozzle 51 then sprays water onto the rotating screen to wash the rotating screen. Subsequently, the control unit switches the washing valve 55 from the open position to the closed position, for example, when the hydraulic pump 77 is switched on.

[0077] According to another configuration of the present invention, the unit formed by the washing pipe 91 and the drain pipe 83 constitutes a backwash system for the pre-filtration system 67, and its functions are as follows:

[0078] The control unit is configured to simultaneously switch the state of the cleaning valve 95, the ultrafiltration valve 89, and the drain valve 85.

[0079] Such changes in state occur, for example, after a predetermined number of operations of the rinsing system 9. As an example, the change in state that controls the operation of the backwashing system of the pre-filtration system 67 occurs after 20 consecutive operation cycles of the rinsing system 9.

[0080] When such a state change occurs, the control unit simultaneously switches the cleaning valve 95 from the closed state to the open state, the ultrafiltration valve 89 from the open state to the closed state, and the drain valve 85 from the closed state to the open state.

[0081] Therefore, the water flowing from the water inlet 17 flows into the washing pipe 91, then passes through the backflow prevention valve 93, and with the ultrafiltration valve 89 closed, it flows backward to the pre-filtration device 67.

[0082] The water containing impurities collected in the pre-filtration system 67 flows through the open pre-filtration valve 81 and reaches the drain pipe 83 due to the presence of a backflow prevention valve 79 in the pre-filtration pipe 75 and an open drain valve 85 in the drain pipe 83. The contaminated water is then transported through the drain pipe 83 to a discharge pipe 30 that can be connected to a sewer line.

[0083] The unit formed by the flush valve 95, the backflow prevention valve 93, the ultrafiltration valve 89, the pre-filtration valve 81, the backflow prevention valve 79, and the drain valve 85 constitutes a unit for controlling the direction of water flow and is positioned in the facility 5 to transport water from the water inlet 17 to the pre-filtration system 67, and then from the pre-filtration system 67 to the discharge pipe 30.

[0084] The control unit is configured so that the hydraulic pump does not operate until the backwash sequence is complete.

[0085] The lifespan of the equipment 5 is optimized by performing regular cleaning of the solid-liquid separation filter 25 and the pre-filtration system 67. Furthermore, the quality of the filtration operation is optimized as a result. The amount of water used to perform the cleaning step of the solid-liquid separation filter 25 and the backwashing step of the pre-filtration system 67 is negligible compared to the savings achieved by the equipment 5.

[0086] According to yet another configuration of the present invention, a unit formed by a pre-filter pipe 75, a hydraulic pump 77, and a drain pipe 83 constitutes a system for draining a tank 71 for storing liquids, and its operation is as follows:

[0087] The control unit is configured to control the operation of the hydraulic pump 77 by simultaneously switching the state of the pre-filter valve 81 and the state of the drain valve 85.

[0088] Such state changes occur, for example, after a predetermined number of operations of the washing system 9. For instance, a state change controlling the operation of the drain system of the liquid storage tank 71 occurs after 20 consecutive operation cycles of the washing system 9. The start of the cycle is delayed, for example, relative to the cycle used to operate the washing system of the pre-filtration system 67.

[0089] The drainage from tank 71 may be complete or partial.

[0090] When such a change in state occurs, the control unit simultaneously switches the pre-filter valve 81 from the open state to the closed state, the drain valve 85 from the closed state to the open state, and starts the hydraulic pump.

[0091] The liquid flowing from the storage tank 71 enters the pre-filter pipe 75, then passes through the check valve 79 and reaches the drain pipe 83. At this time, the drain valve 85 is in the open position and the pre-filter valve is in the closed position. Subsequently, the liquid is transported through the drain pipe 83 to the discharge pipe 30, which can be connected to the sewer pipe.

[0092] The unit formed by the hydraulic pump 77, the backflow prevention valve 79, the pre-filter valve 81, and the drain valve 85 constitutes a unit for controlling the circulation direction of the liquid, which is located in the equipment 5 for transporting the liquid from the storage tank 71 to the discharge pipe 30.

[0093] In another embodiment, the outlet of pipe 30 is connected to the outlet of filter 25 so that all or part of the drain liquid is used to clean the filter 25. A valve may be provided to direct the flow of the liquid to filter 25 or to direct it directly to the sewage system.

[0094] In a highly advantageous embodiment, the equipment includes an electrical control unit, which includes a computer for managing the operation of the equipment, particularly the operation of pumps and valves according to different cycles. Furthermore, this unit provides monitoring of the correct operation of the equipment, for example, by measuring the flow rate at different points in the fluid circuit, and this monitoring is used to detect blockages and initiate backwash cleaning cycles and / or maintenance requests.

[0095] The control unit can communicate with a central unit that collects and monitors equipment data, and can also prepare for intervention when equipment information is needed.

[0096] The equipment of the present invention has the advantage of being easily incorporated into existing residential or industrial buildings as a replacement for existing toilets, by introducing a suspended or wall-mounted toilet. It can be introduced into construction projects.

[0097] Of course, the present invention is not limited to the embodiments of equipment for treating wastewater from WC and sanitary units described herein only as examples. Rather, the present invention encompasses all modifications, including technical equivalents of the described means, and also combinations thereof, where such combinations fall within the scope of the present invention.

Claims

1. Equipment (5) for treating wastewater from WC (3), The WC (3) includes a toilet bowl (7) and a flushing system (9), the flushing system (9) comprises a main tank (11) connected to a water inlet (17), and water is supplied to the main tank (11) from an external water source via the water inlet (17). The aforementioned equipment (5) is, A solid-liquid separation filter (25) to be attached to the outlet of the toilet bowl (7), The system includes a liquid recirculation circuit (27) arranged to transport liquid from the solid-liquid separation filter (25) to the main tank (11), The solid-liquid separation filter (25) is An inlet (35) for connecting to the outlet of the toilet bowl (7), A solid-liquid separation module (33) configured to separate solids from liquids, A first outlet (45) for connecting to the discharge pipe (30), The liquid recirculation circuit (27) includes a second outlet (49) connected to the liquid recirculation circuit (27), The solid-liquid separation filter (25) is configured to transport solid matter from the solid-liquid separation module (33) to the first outlet (45) and to transport liquid matter from the solid-liquid separation module (33) to the second outlet (49). The liquid recirculation circuit (27) includes a filtration unit (65), and the filtration unit (65) is configured such that the liquid flows through the filtration unit (65) so that the liquid can be reused in the washing system (9). The filtration unit (65) of the liquid recirculation circuit (27) includes a pre-filtration system (67) and an ultrafiltration system (69) connected in series. The equipment (5) further includes a backwashing system for the pre-filtration system (67), the backwashing system being connected to the water inlet (17) and the discharge pipe (30), and configured such that water supplied from the water inlet (17) flows in reverse through the pre-filtration system (67) to the discharge pipe (30).

2. The apparatus (5) according to claim 1, wherein the solid-liquid separation filter (25) has a housing (31) in which the solid-liquid separation module (33) is mounted, and the solid-liquid separation module (33) is a rotating screen (39) driven by an electric motor (40).

3. The apparatus (5) according to claim 2, wherein the solid-liquid separation filter (25) includes a cleaning nozzle (51) for the rotating screen (39) and a cleaning pipe (53) having one end connected to the cleaning nozzle (51) and the other end connected to a water inlet (17).

4. The apparatus (5) according to any one of claims 1 to 3, comprising a storage tank (71) for liquid supplied from the second outlet (49) of the solid-liquid separation filter (25), and a hydraulic pump (77) arranged for extracting the liquid contained in the storage tank (71).

5. The system includes a system for draining liquid from the storage tank (71), and the system is A pre-filtration pipe (75) connects the storage tank (71) to the pre-filtration system (67), A drain pipe (83) is connected to the aforementioned pre-filter pipe (75) and to the aforementioned discharge pipe (30), The apparatus (5) according to claim 4, comprising a unit for controlling the flow direction of a liquid, which is arranged in the apparatus (5) for transporting a liquid from the storage tank (71) to the discharge pipe (30).

6. The equipment (5) according to any one of claims 1 to 3, wherein the backwash system is connected to the discharge pipe (30) via a drain pipe (83) having a drain valve (85), and the drain valve (85) is configured to open when the backwash system is in operation.

7. The backwashing system of the pre-filtration system (67) is The pre-filtration pipe (75) to which the pre-filtration system (67) is connected, A cleaning pipe (91) is connected to the pre-filtration system (67) and to the water inlet (17), A drain pipe (83) is connected to the aforementioned pre-filter pipe (75) and to the aforementioned discharge pipe (30), The apparatus (5) according to any one of claims 1 to 3, further comprising a unit for controlling the direction of water circulation, which is arranged in the apparatus (5) for transporting water from the water inlet (17) to the pre-filtration system (67), and then from the pre-filtration system (67) to the discharge pipe (30).

8. The apparatus (5) according to claim 4, wherein the storage tank (71) includes an upper cover (66) having an opening (68) for receiving the second outlet (49) of the solid-liquid separation filter (25).

9. The apparatus (5) according to any one of claims 1 to 3, wherein the solid-liquid separation filter (25) includes two arms for attaching the pre-filtration system (67) and the ultrafiltration system (69).

10. A toilet (7) and a flushing system (9) are provided in a WC (3), wherein the flushing system (9) includes a main tank (11), and the main tank (11) is connected to a water inlet (17) and the toilet (7), A sanitary unit (1) comprising: equipment (5) according to any one of claims 1 to 3 for treating wastewater from the WC (3), wherein the recirculation pipe is connected to the main tank (11) of the WC; and equipment (5).

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