Classified grey water recycling method and system for multi-storey residential building

Abstract

The invention discloses a hierarchical grey water recycling method and system for a multi-storey residential building, a collecting unit and a water storage unit are buried under the floor of each household to collect and store bath grey water, the bath grey water is used for cleaning the toilet stool of the household, and the redundant grey water can naturally flow to the lower floor to be used for cleaning the toilet stool or collecting the grey water. According to the system, grey water after bathing of each household can be automatically collected and used for flushing the toilet stool of the household, consumption of purified water in municipal water supply by the toilet stool is greatly reduced, redundant purified grey water of each household can naturally flow to the next floor for grey water utilization or directly flow into a municipal grey water official website, the water-saving and energy-saving effects are obvious, and the system is suitable for popularization and application. And due to the arrangement of the water-saving tank, the water-saving modular installation of each household can be conveniently realized, the cost is lower, the construction period is shorter, an impounding reservoir does not need to be arranged under the ground of the building, and the rebuilding construction and transformation of the existing residential building are facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building grey water treatment, in particular to a multi-storey residential building hierarchical grey water recycling method and system. BACKGROUND

[0002] With the continuous development of urbanization, the life style of water supply to the house and automatic collection and centralized treatment of sewage brings convenience to more and more people, but inevitably causes a large amount of waste of water resources. For example, the traditional multi-storey residential building generally does not distinguish the bathroom waste water of each family, and directly discharges it into the building sewage pipe network for centralized treatment. Investigation shows that the average household bathing waste water in China accounts for 30-40% of the bathroom waste water, and the household in the hot south is as high as more than 60%. But if the bathing waste water (i.e. grey water) is collected and used for flushing sanitary waste, it will not affect the quality of life, but can save a lot of pipe water resources, greatly reduce the consumption of bathroom water, and significantly reduce the cost of sewage treatment.

[0003] In the conventional grey water utilization system, a water storage tank needs to be built underground in the building, and an independent pipe is provided in the building. The transformation cost of building grey water recycling is very high and the construction is difficult. On the other hand, if the water supply pipeline of the whole building is transformed, the grey water recycling pipeline is used to supply grey water to the sanitary water pipeline of each household. The pipeline is complex, and a booster device may be needed to ensure that the high-rise can use water normally. There are construction errors and safety hazards of misconnection of grey water into clean water pipeline. If an independent grey water system is set up in each household of each floor, the transformation period is long and the cost is very high, and the practical value is low.

[0004] Based on the above reasons, it is necessary to seek a new grey water recycling method to reduce the cost or transformation cost of building grey water utilization and improve its practicability and popularity. SUMMARY

[0005] In view of the problems in the prior art, the present application provides a multi-storey residential building hierarchical grey water recycling method and system, which can automatically collect the grey water after bathing of each household and be used for flushing the toilet of the household. The consumption of clean water in municipal water supply by the toilet is greatly reduced, and the excess grey water purified by each household can flow naturally to the next floor for grey water utilization, or directly flow into the municipal grey water official website. The water and energy saving effect is obvious, and the modular installation of each household water saving module is easy to realize, the cost is lower, the construction period is shorter, and there is no need to set a water storage tank underground in the building. It is convenient for the renovation and transformation of the existing residential building.

[0006] To solve the above technical problems, a technical solution adopted by the present application is as follows: The multilayer residential building hierarchical grey water recycling method comprises the following steps: Step S1: a collection unit and a water storage unit are arranged under the floor of each household, the collection unit collects the grey water discharged by the bathing unit, purifies the grey water, detects the water quality of the grey water, and feeds back the water quality to a remote monitoring end, and the discharged grey water enters a primary pipeline and the water storage unit; Step S2: the primary pipeline is connected to the water supply pipeline of the toilet of the household, and a three-way valve is arranged at the connection position of the primary pipeline and the water supply pipeline, the three-way valve is used to connect the water supply pipeline and the water tank of the toilet or connect the primary pipeline and the water tank of the toilet; Step S3: the water storage unit is connected to a secondary pipeline, when the floor is not the bottom floor, the secondary pipeline penetrates through the floor and is connected to the collection unit of the lower floor, when the floor is the bottom floor, the secondary pipeline is connected to a grey water storage tank of the multilayer residential building, and the grey water storage pipeline is connected to a municipal grey water pipeline network; Step S4: the remote monitoring end monitors the grey water quality data fed back by each collection unit in real time, compares the grey water quality data with set data, and if the comparison result shows that the grey water quality is worse than the set water quality requirement, an alarm of abnormal purification of the collection unit is sent.

[0007] Another technical solution adopted by the application is as follows: The multilayer residential building hierarchical grey water recycling system is used for applying the hierarchical grey water recycling method in the above technical solution to a multilayer residential building, and wherein: Each collection unit comprises a collection tank, each collection tank is provided with a plurality of water inlet channels, a purification device and a water outlet channel, each water inlet channel can be connected to the water outlet end of the bathing unit of the household or the secondary pipeline, each purification device is arranged in the collection tank and can filter and / or decompose solid impurities and / or oil and / or harmful bacteria in the grey water, a detection device is arranged on each water outlet channel to detect the TSD value, oil content and harmful bacteria content of the grey water, and each water outlet channel is connected to the primary pipeline or the water storage unit; Each water storage unit comprises a water storage tank, and the water outlet end of the water storage tank is provided with the secondary pipeline.

[0008] As a further elaboration of the above technical solution: In the technical scheme, each of the first pipes is provided with a first check valve, each of the first check valves is electrically connected with the three-way valve of the corresponding household, and when the floor is the top floor, a booster pump is further arranged on the first pipe to pump the grey water under the floor to the water tank of the toilet, and the first check valve and the booster pump are electrically connected with the photovoltaic device.

[0009] In the technical scheme, each of the water storage tanks is provided with a third check valve and a water level sensor, each of the second pipes is provided with a third check valve, each of the third check valves is electrically connected with the photovoltaic device, the first check valve, the second check valve, the third check valve and the water level sensor of the corresponding household, the first check valve, the second check valve, the third check valve and the water level sensor of each household are electrically connected with the remote monitoring terminal, and a blockage prevention channel is arranged at the connection between each of the second pipes and the water storage tank.

[0010] In the technical scheme, each of the purification devices comprises a filter screen, a centrifugal separator and a disinfection chamber arranged in the collection tank in sequence along the direction of the flow of the grey water, each of the filter screens is arranged outside the water inlet channel and used for filtering hair, each of the centrifugal separators comprises a cavity, the lower end of the cavity is provided with a water outlet, and the upper end of the cavity is provided with an oil outlet, the cavity is drivingly connected with a motor and can rotate under the driving of the motor to separate water and oil in the grey water, the separated water enters the disinfection chamber through the water outlet, the separated oil enters an oil box through the oil outlet, the oil box is movably arranged on the cavity to facilitate dismounting, replacement and mounting, the disinfection chamber is provided with a purple light lamp, and the side wall of the disinfection chamber is provided with the water outlet channel. In the technical scheme, the collection unit and the water storage unit of each household are arranged in a water saving tank, the side wall of the water saving tank is provided with a plurality of water inlet ports and two water outlet ports, each of the water inlet ports is matched with a water inlet channel, and the two water outlet ports are matched with the first pipe and the second pipe respectively.

[0011] In the technical scheme, a heating pipe is further arranged on the periphery or the side of the water saving tank.

[0012] In the technical scheme, the top floor and / or the outer wall of the multi-storey residential building are further provided with a photovoltaic device, and the photovoltaic device is electrically connected with each of the purification devices, the detection devices and the three-way valves.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: by setting up a collection unit and a water storage unit under the floor of each household, setting up a primary pipeline between the collection unit and the toilet, and setting up a secondary pipeline between the water storage unit and the collection unit on the next floor, the greywater after bathing in each household can be automatically collected and purified for flushing the toilet, which greatly reduces the consumption of purified water from the municipal water supply. Moreover, the excess greywater after purification in each household in the entire building can flow naturally to the next floor for greywater utilization, or be directly discharged into the municipal greywater pipeline. Except for the primary pipeline on the top floor, which needs to pressurize and pump the greywater to the toilet tank, the greywater storage on the top floor and the greywater use and storage on other floors do not require additional power support, resulting in significant water and energy saving effects. Furthermore, the water-saving tank facilitates modular installation of water-saving systems in each household, resulting in lower costs, shorter construction cycles, and no need to set up a water storage tank in the basement of the building, which facilitates the renovation and transformation of existing residential buildings. Attached Figure Description

[0014] Figure 1 This is a block diagram of the greywater recycling method of the present invention; Figure 2 This is a schematic diagram of the greywater recycling system in the residential building in this embodiment; Figure 3 This is a schematic diagram of the structure for recycling greywater between the upper and lower floors in this embodiment; Figure 4 This is a schematic diagram of the purification device in this embodiment; Figure 5 This is a schematic diagram of the three-way valve in two conduction states in this embodiment; Figure 6 This is a schematic diagram of the remote monitoring principle in this embodiment.

[0015] In the picture: 1. Water supply pipeline; 2. Sewage pipeline; 3. Shower unit; 4. Toilet; 5. Flooring; 1. Collection unit; 61. Collection box; 62. Water inlet channel; 63. Purification device; 64. Drainage channel; 65. Detection device; 602. Filter screen; 603. Centrifuge; 604. Disinfection chamber; 605. Oil box; 03. Chamber; 04. Water outlet; 05. Oil outlet; 06. Ultraviolet lamp; 2. Water storage unit; 71. Water storage tank; 72. Water level sensor; 73. Anti-clogging channel; 74. Second check valve; 3. Remote monitoring terminal; 4. Primary pipeline; 10. Three-way valve; 11. Secondary pipeline; 12. Grey water storage tank; 13. Photovoltaic device; 14. First check valve; 15. Booster pump; 16. Third check valve; 1. Water-saving tank; 07. Inlet port; 08. Outlet port; 2. Heating pipe; 3. Municipal grey water pipe network. DETAILED DESCRIPTION

[0016] The application will be further described below in conjunction with the accompanying drawings.

[0017] The embodiments described with reference to the drawings are exemplary and are intended to explain the present application, and are not understood as limiting the present application. In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "several", "a plurality of" is two or more, unless otherwise explicitly specified and limited. In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature with respect to the second feature can include the direct contact between the first and second features, or can include the indirect contact between the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature with respect to the second feature include the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature with respect to the second feature include the first feature below and obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0018] As Figure 1As shown, the multi-storey residential building hierarchical grey water recycling method, the building is provided with a water supply pipeline 1 and a sewage pipeline 2, the water supply pipeline 1 is communicated with the water tank of the bathing unit 3 or the toilet 4 of each household, and the sewage pipeline 2 is communicated with the sewage discharge port of each toilet 4; the hierarchical grey water recycling method comprises the following steps: Step S1: a collecting unit 6 and a water storage unit 7 are arranged under each floor 5, the collecting unit 6 is used for collecting the grey water discharged from the bathing unit 3, purifying the grey water and detecting the water quality of the grey water, and then feeding back to a remote monitoring end 8, the outflowing grey water enters a first pipeline 9 and the water storage unit 7; Step S2: the first pipeline 9 is communicated with the water supply pipeline 1 connected with the toilet 4 of the household, and a three-way valve 10 is arranged at the connection position of the two, the three-way valve 10 is used for communicating the water supply pipeline 1 with the water tank of the toilet 4 or communicating the first pipeline 9 with the water tank of the toilet 4; Step S3: the water storage unit 7 is communicated with a second pipeline 11, when the floor is not the bottom floor, the second pipeline 11 penetrates through the floor and is communicated with the collecting unit 6 of the lower floor, when the floor is the bottom floor, the second pipeline 11 is communicated with a grey water storage tank 12 of the multi-storey residential building, and the grey water storage tank 12 is communicated with a municipal grey water pipeline network 19; Step S4: the remote monitoring end 8 monitors the grey water quality data fed back by each collecting unit 6 in real time, and compares the data with the set data, if the comparison result shows that the grey water quality is worse than the set water quality requirement, an alarm of abnormal purification of the collecting unit 6 is sent.

[0019] As shown, Figure 2 The application also discloses a hierarchical grey water recycling system for multi-storey residential buildings, which is used for applying the above hierarchical grey water recycling method on the multi-storey residential buildings, and wherein: As shown, Figure 3 Each collecting unit 6 comprises a collecting tank 61, each collecting tank 61 is provided with a plurality of water inlet channels 62, a purifying device 63 and a water outlet channel 64, each water inlet channel 62 can be communicated with the water discharge end of the bathing unit 3 of the household or the second pipeline 11, each purifying device 63 is arranged in the collecting tank 61 and can filter and / or decompose solid impurities and / or grease and / or harmful bacteria in the grey water, each water outlet channel 64 is provided with a detection device 65 to detect the TSD value, grease content and harmful bacteria content of the grey water, and each water outlet channel 64 is communicated with the first pipeline 9 or the water storage unit 7; each water storage tank 71 is provided with a third one-way valve 74 and a water level sensor 72, each second pipeline 11 is provided with a third one-way valve 16, each third one-way valve 16 is electrically connected with the photovoltaic device 13, the first one-way valve 14, the second one-way valve 16, the third one-way valve 74 and the water level sensor 72 of the household, and the water level sensor 72 of the household is electrically connected with the remote monitoring end 8, and each second pipeline 11 is provided with an anti-blocking channel 73 at the connection position with the water storage tank 71.

[0020] As shown in Figure 4 each purification device 63 includes a filter screen 602, a centrifugal separator 603 and a disinfection chamber 604 arranged in sequence along the direction of the grey water flow in the collection tank 61, each filter screen 602 is arranged outside the water inlet channel 62 and used for filtering hair, each centrifugal separator 603 includes a cavity 03, the lower end of the cavity 03 is provided with a water outlet 04, and the upper end is provided with an oil outlet 05, the cavity 03 is in transmission connection with a motor and can rotate under the drive of the motor to separate water and oil in the grey water, the separated water enters the disinfection chamber 604 through the water outlet 04, the separated oil enters the oil box 605 through the oil outlet 05, the oil box 605 is movably arranged on the cavity 03 so as to be disassembled and replaced, the disinfection chamber 604 is provided with a purple light 06, and a drainage channel 64 is arranged on the side wall thereof.

[0021] As shown in Figures 2-3 In order to facilitate the modular installation of the grey water treatment of each household to reduce the construction cost and provide construction efficiency, the collection unit 6 and the water storage unit 7 of each household are built-in in a water saving tank 17, a plurality of water inlet ports 07 and two water outlet ports 08 are arranged on the side wall of the water saving tank 17, each water inlet port 07 is matched with a water inlet channel 62, and the two water outlet ports 08 are matched with the primary pipeline 9 and the secondary pipeline 11 respectively.

[0022] On the other hand, in order to integrate into the current and future smart city and Internet of Things network construction, the first one-way valve 14 is arranged on each primary pipeline 9, each first one-way valve 14 is electrically connected with the three-way valve 10 of the household, and when the floor is the top floor, the booster pump 15 is arranged on the primary pipeline 9 for pumping the grey water under the floor 5 to the water tank of the toilet 4, and the first one-way valve 14 and the booster pump 15 are electrically connected with the photovoltaic device 13.

[0023] It can be understood that the arrangement of the first one-way valve 14 and the third one-way valve 16 facilitates the effective and sufficient utilization of the grey water of each household. As shown in Figure 6 The recycling process of the grey water in the present application is as follows: 1. Collect, purify and detect the grey water: after bathing, the grey water enters the collection tank 61 through the water inlet channel 62, and then the hair is filtered through the filter screen 602, the water and oil are separated through the centrifugal separator 603, and the purple light sterilization is performed in the new sand chamber 604, the purified grey water enters the detection device 65 through the drainage channel 64, the solid particle content (TSD value), the oil content and the common harmful bacteria (such as E. coli, salmonella and staphylococcus aureus) in the grey water are detected, and the detection data is fed back to the remote monitoring end 8 so as to timely control the purification effect of the purification device 63, and the corresponding purification unit is timely repaired or replaced; 2, the gray water quality of this time meets the use standard, the first check valve 14 opens, the gray water enters the primary pipeline 9, and is used for flushing the toilet 4 through the scheduling of the three-way valve 10, if there is no water in the primary pipeline 9, the municipal water supply pipeline 1 and the flushing toilet 4 are scheduled to be connected, the gray water not used in time flows into the water storage tank 71 through the second check valve 74, when the gray water in the primary pipeline 9 is in an insufficient state or is used up, the first check valve 14 is opened first when the gray water in the drain pipeline 64 flows out, and enters the primary pipeline 9; 3, the gray water communication between the upper and lower floors or the communication with the municipal gray water official website 19: when the water level sensor 72 in the water storage tank 71 senses that the liquid level reaches the set standard, a signal is sent, and the third check valve 16 is opened. The gray water in the water storage tank 71 enters the collection tank 61 or the drain passage 64 of the next floor through the secondary pipeline 11, and enters the gray water recycling system of the household. If the household is not the bottom floor of the residential building, the secondary pipeline 11 guides the gray water in the water storage tank 71 of the household into the gray water storage tank 12 of the building, and the gray water is collected into the municipal gray water official website 19.

[0024] Figure 5 The structure schematic diagrams of the three-way valve 10 in two working states in the embodiment are shown. The three-way valve 10 is a T-shaped ball valve, which can realize the rapid switching of the municipal water supply pipeline 1 and the primary pipeline 9 and the water tank of the toilet 4. The anti-blocking passage 74 is a U-shaped pipeline structure arranged according to the siphon principle. The siphon structure belongs to the prior art, and the specific structure of the anti-blocking passage is not described here.

[0025] It can be seen that, by arranging the collection unit 6 and the water storage unit 7 under each floor 5, arranging the primary pipeline 9 between the collection unit 6 and the toilet 4, and arranging the secondary pipeline 11 between the water storage unit 7 and the collection unit 6 of the next floor, the gray water after bathing of each household can be automatically collected, and the gray water can be purified and used for flushing the toilet 4 of the household. The consumption of clean water in the municipal water supply for flushing the toilet 4 is greatly reduced. The excess gray water after purification of each household in the whole building can flow to the next floor for gray water utilization or be directly collected into the municipal gray water official website. Except that the primary pipeline 9 of the top floor needs to pressurize and pump the gray water to the water tank of the toilet 4, the gray water storage of the top floor and the use and storage of the gray water of the remaining floors do not need additional power support, and the water saving and energy saving effect is obvious. The arrangement of the water saving tank 17 facilitates the modular installation of the water saving module of each household, the cost is lower, the construction period is shorter, and there is no need to arrange a water storage tank underground of the building, which is convenient for the renovation and reconstruction of the existing residential building.

[0026] According to the normal life water consumption estimation of a four-person family, the average bathing grey water consumption of each family is about 150-200L / day, and the single use water consumption of a common toilet is 5L, so the grey water of the day can be enough to cover the toilet flushing water; according to the calculation of a 9-story building with four families in one floor, the total amount of grey water saved and collected by the building in one year can reach more than 2600 tons, and the water saving effect is very significant, and the total amount of sewage in the sewage pipeline of the building can be significantly reduced, and the sewage treatment cost can be greatly reduced. In addition, according to the current general construction standard, the floor of the bathroom of each family in the old building is renovated, and the cost is about 80-100 yuan / m2, and the total cost of materials, construction and labor of a single bathroom area of each family is about 2000 yuan / house (single bathroom)-4000 yuan / house (double bathroom) or so. Not only is it suitable for new building construction, but also is suitable for low-cost construction and renovation of old buildings, and is worth wide application.

[0027] As shown in Figure 3 , in order to deal with the freezing phenomenon caused by the cold season in the north, the application is provided with a heating pipeline 18 outside or beside the water saving tank 17 under the floor 5 of each family. In practical application, the mode of residential building with floor heating (i.e. heating pipe is laid under the floor of each family) for heating is very common in the heating area of the north, and the application can realize the smooth operation of the grey water circulation system of each family and the floors above and below in the cold season by reasonably setting the shape, structure and size of the water saving tank 17 and reasonably selecting the laying path of the secondary pipeline 11 on the basis of the existing floor heating structure.

[0028] As shown in Figure 2 , in order to reduce energy consumption and improve the utilization of clean energy, the application is provided with a photovoltaic device 13 on the roof or outer wall of the top floor of the multi-story residential building, and the photovoltaic device 13 is electrically connected with each purification device 63, detection device and three-way valve 10.

[0029] The above is not any limitation on the technical scope of the application, and any modification, equivalent change and modification of the above embodiments according to the technical essence of the application still belong to the technical scope of the application.

Claims

1. A method for graded greywater recycling in multi-story residential buildings, wherein a water supply pipeline (1) and a sewage pipeline (2) are provided within the building, the water supply pipeline (1) being connected to the water tank of each household's bathing unit (3) or toilet (4), and the sewage pipeline (2) being connected to the sewage outlet of each household's toilet (4); characterized in that, Includes the following steps: Step S1: Install a collection unit (6) and a water storage unit (7) under the floor (5) of each household. The collection unit (6) collects the grey water discharged from the bathing unit (3), purifies it, tests its water quality, and feeds it back to the remote monitoring terminal (8). The grey water flows into the primary pipeline (9) and the water storage unit (7). Step S2: The primary pipeline (9) is connected to the water supply pipeline (1) that connects to the toilet (4) of the household, and a three-way valve (10) is provided at the connection between the two. The three-way valve (10) is used to connect the water supply pipeline (1) to the water tank of the toilet (4) or to connect the primary pipeline (9) to the water tank of the toilet (4). Step S3: The water storage unit (7) is connected to the secondary pipeline (11). When the floor is not the ground floor, the secondary pipeline (11) passes through the floor and is connected to the collection unit (6) on the floor below it. When the floor is the ground floor, the secondary pipeline (11) is connected to the grey water storage tank (12) of the multi-story residential building. The grey water storage pipe (12) is connected to the municipal grey water pipe network (13). Step S4: The remote monitoring terminal (8) monitors the grey water quality data fed back by each collection unit (6) in real time and compares it with the set data. If the comparison result shows that the grey water quality is worse than the set water quality requirements, an alarm is issued for the abnormal purification of the collection unit (6).

2. A multi-story residential building graded greywater recycling system, used to apply the graded greywater recycling method as described in claim 1 to multi-story residential buildings; characterized in that: Each collection unit (6) includes a collection box (61), each collection box (61) is provided with several water inlet channels (62), a purification device (63) and a drainage channel (64), each water inlet channel (62) can be connected to the drainage end of the bathing unit (3) of the household or the secondary pipeline (11), each purification device (63) is provided in a collection box (61) and can filter and / or decompose solid impurities and / or grease and / or harmful bacteria in the grey water, each drainage channel (64) is provided with a detection device (65) to detect the TSD value, grease content and harmful bacteria content of the grey water, and each drainage channel (64) is connected to the primary pipeline (9) or the water storage unit (7); Each of the water storage units (7) includes a water storage tank (71), and its drainage end is provided with the secondary pipeline (11).

3. The graded greywater recycling system for multi-story residential buildings according to claim 2, characterized in that, Each of the primary pipelines (9) is equipped with a first check valve (14), and each of the first check valves (14) is electrically connected to the three-way valve (10) of the household. When the floor is the top floor, the primary pipeline (9) is also equipped with a booster pump (15) to pump the grey water under the floor (5) to the water tank of the toilet (4). The first check valve (14) and the booster pump (15) are both electrically connected to the photovoltaic device (13).

4. The graded greywater recycling system for multi-story residential buildings according to claim 3, characterized in that, Each of the water storage tanks (71) is equipped with a third check valve (74) and a water level sensor (72). Each of the secondary pipelines (11) is equipped with a third check valve (16). Each of the third check valves (16) is electrically connected to the photovoltaic device (13), the first check valve (14), the second check valve (16), the third check valve (74), and the water level sensor (72) of the household, and to the remote monitoring terminal (8). Each of the secondary pipelines (11) is equipped with an anti-blocking channel (73) at the connection between it and the water storage tank (71).

5. The graded greywater recycling system for multi-story residential buildings according to claim 2, characterized in that, Each of the purification devices (63) includes a filter screen (602), a centrifuge (603), and a disinfection chamber (604) arranged sequentially in the collection box (61) along the direction of gray water flow. Each filter screen (602) is located outside the water inlet channel (62) and is used to filter hair. Each centrifuge (603) includes a cavity (03) with a water outlet (04) at the lower end and an oil outlet (05) at the upper end. The cavity (03) is connected to a motor and can rotate under its drive to separate water and grease from the ash water. The separated water enters the disinfection chamber (604) through the water outlet (04), and the separated grease enters the oil box (605) through the oil outlet (05). The oil box (605) is movably mounted on the cavity (03) for easy disassembly and replacement. The disinfection chamber (604) is equipped with a UV lamp (06), and the drainage channel (64) is provided on its side wall.

6. The graded greywater recycling system for multi-story residential buildings according to any one of claims 2-5, characterized in that, Each household's collection unit (6) and water storage unit (7) are built into a water tank (17). The side wall of the water tank (17) is provided with several water inlet ports (07) and two water outlet ports (08). Each water inlet port (07) is adapted to a water inlet channel (62), and the two water outlet ports (08) are adapted to the primary pipeline (9) and the secondary pipeline (11) respectively.

7. The graded greywater recycling system for multi-story residential buildings according to claim 6, characterized in that, Heating pipes (18) are also provided around or beside the water-saving tank (17).

8. The graded greywater recycling system for multi-story residential buildings according to claim 6, characterized in that, The rooftop and / or exterior wall of the multi-story residential building are also equipped with photovoltaic devices (13), which are electrically connected to each of the purification devices (63), detection devices (65) and three-way valves (10).

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