Unpowered cross-layer reclaimed water toilet flushing reuse filter device

Abstract

The utility model discloses a kind of greywater toilet flushing reuse filter devices of unpowered cross layer, the device includes box, box is set in the upper portion of current floor;Current floor is any floor below top floor;Deposition interception box grid, multistage filter material box grid and water storage box grid are sequentially arranged in box along horizontal direction;Partition is arranged between any adjacent box grid, each partition has water-permeable hole;Water inlet pipe is arranged on the box wall of deposition interception box grid;Deposition filter layer is arranged in deposition interception box grid;Multistage filter material box grid is arranged along horizontal direction, and filter material layer is arranged in each filter material box grid;Water outlet pipe is arranged on the box wall of water storage box grid.The filter device provided by the utility model is flattened along horizontal direction, saves installation space;By multistage filtration, obtain the toilet flushing water meeting the requirements, save tap water;Unpowered setting mode saves energy.

Description

Technical Field

[0001] This utility model belongs to the technical field of water treatment equipment, specifically relating to a non-powered, multi-level greywater flushing and filtration device. Background Technology

[0002] Research data shows that my country's per capita freshwater resources are only 25% of the global average, and more than half of the country's 600+ cities face varying degrees of water shortage. With social progress and continuous urbanization, water resource conflicts are becoming increasingly prominent, and urban water scarcity is intensifying.

[0003] In the field of water resource management, greywater reuse technology, as an important strategy for wastewater resource utilization, focuses on the centralized treatment of domestic wastewater to meet specific standards for non-drinking uses such as greening irrigation, vehicle washing, road cleaning, and household sanitation flushing, thereby achieving water conservation. School dormitories and apartment buildings, as densely populated areas with concentrated water demand and usage, benefit significantly from greywater reuse technology, which is also easy to promote and implement. Greywater reuse technology not only helps reduce wastewater discharge but also effectively conserves freshwater resources, promotes water recycling, alleviates the tension between freshwater supply and demand, and ultimately improves water resource utilization efficiency, making it extremely significant.

[0004] Currently, most mainstream greywater flushing systems require facilities such as booster pumps and reaction tanks to collect large amounts of wastewater, treat it centrally, and supply it to building toilets. However, these systems are large and complex, require high initial investment, need to be connected to electricity, and occupy a large area.

[0005] Small-scale greywater collection and flushing devices utilize gravity for water collection and supply. Chinese utility model patent publication number CN2585898Y discloses a greywater flushing device, but this device only proposes collecting upper wastewater, filtering it, and then using it for flushing the toilet in the lower layer, without specifying the structure of the filtration device.

[0006] Currently, most mainstream greywater reuse systems are large-scale integrated facilities, requiring the construction of auxiliary facilities such as equalization tanks, booster pumps, storage tanks, and pipeline systems. These systems occupy a large area, require significant investment, and necessitate power supply. They are typically used in areas with high water demand, but their widespread adoption in older residential areas and older university buildings is limited by investment, land occupation, and pipeline system constraints. Meanwhile, some small-scale wastewater collection and flushing systems used in university dormitories lack effective filtration capabilities. While they can achieve water conservation, they have strict requirements for the quality of the collected wastewater and may result in flushing water that does not meet national standards.

[0007] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this utility model, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0008] To address the aforementioned problems in the existing technology, this utility model provides a non-powered, multi-level greywater flushing and recycling filtration device. The technical problem to be solved by this utility model is achieved through the following technical solution:

[0009] This utility model provides a non-powered, multi-level greywater flushing and filtration device, including a housing, which is located above the current floor; the current floor is any floor below the top floor.

[0010] The box body includes multiple compartments, which are arranged horizontally as sedimentation and interception compartments, multi-stage filter media compartments, and water storage compartments; partitions are provided between any adjacent compartments, and each partition has water-permeable holes;

[0011] The sedimentation and interception tank is equipped with an inlet pipe on its wall, which is used to receive domestic wastewater from the upper floor; the sedimentation and interception tank is equipped with a sedimentation and filtration layer.

[0012] The multi-stage filter media boxes are arranged horizontally, and each filter media box contains a filter media layer. The multi-stage filter media boxes are used to obtain greywater that meets the standards for toilet flushing.

[0013] The water storage tank is equipped with a water outlet pipe on its wall, which is used to connect to the toilet flushing tank on the current floor.

[0014] In one embodiment of this utility model, the multi-stage filter media box includes a first-stage filter media box, a second-stage filter media box, a third-stage filter media box, and a fourth-stage filter media box arranged sequentially in the horizontal direction.

[0015] In one embodiment of this utility model, the partition includes a first partition, a second partition, a third partition, a fourth partition, and a fifth partition; the first partition is disposed between the sedimentation interception tank and the first-stage filter media tank, the second partition is disposed between the first-stage filter media tank and the second-stage filter media tank, the third partition is disposed between the second-stage filter media tank and the third-stage filter media tank, the fourth partition is disposed between the third-stage filter media tank and the fourth-stage filter media tank, and the fifth partition is disposed between the fourth-stage filter media tank and the water storage tank.

[0016] The lower end of the first partition is provided with a first water permeable hole, the lower end of the third partition is provided with a third water permeable hole, and the lower end of the fifth partition is provided with a fifth water permeable hole.

[0017] The second partition is provided with a second water permeable hole in the middle. The height of the filter media layer in the first-stage filter media box and the height of the filter media layer in the second-stage filter media box are both lower than the height of the second water permeable hole.

[0018] The fourth partition has a fourth water-permeable hole in the middle. The height of the filter media layer in the third-stage filter media box and the height of the filter media layer in the fourth-stage filter media box are both lower than the height of the fourth water-permeable hole.

[0019] In one embodiment of this utility model, the fourth water-permeable hole is set at a lower height than the second water-permeable hole.

[0020] In one embodiment of this utility model, the first water-permeable hole, the third water-permeable hole, and the fifth water-permeable hole are all provided with filter media blocking nets, which are used to prevent the filter media in the corresponding filter media box from leaking out.

[0021] In one embodiment of this utility model, the filter media used in the first-stage filter media box is ceramsite, the filter media used in the second-stage filter media box is powdered activated carbon, the filter media used in the third-stage filter media box is granular activated carbon, and the filter media used in the fourth-stage filter media box is powdered activated carbon.

[0022] In one embodiment of this utility model, the box body has an openable cover.

[0023] In one embodiment of this utility model, the sedimentation filter layer includes filter cotton and a support frame disposed below the filter cotton.

[0024] In one embodiment of this utility model, an overflow pipe is provided on the side wall of the sedimentation interception box. The height of the overflow pipe is greater than the height of the second water permeable hole, and the height of the overflow pipe is less than the height of the water inlet pipe.

[0025] In one embodiment of this utility model, a venting pipe is further included, which includes a first venting pipe and a second venting pipe; the first venting pipe is disposed at the lower part of the first-stage filter media box, and the second venting pipe is disposed at the lower part of the third-stage filter media box. The first venting pipe and the second venting pipe are used to vent the water in the box.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] 1. The non-powered, multi-level greywater flushing and recycling filtration device provided by this utility model integrates water collection, filtration, and storage. It is smaller in size than traditional vertical filtration devices, and its flat design allows it to be installed in the ceiling, saving space. Installing the filtration device near the top of non-top floors can significantly shorten the transportation distance of recycled water, avoiding the energy consumption and complex pipeline construction associated with long-distance pipeline transportation.

[0028] 2. After large impurities are filtered through sedimentation and interception chambers, the water then passes through multiple filter media chambers in sequence, ensuring that the filtered water meets national standards for toilet flushing. This replaces the portion of the water that would otherwise require clean tap water, thus achieving "cascade utilization" of water resources. This significantly reduces the amount of municipal tap water consumed in the toilet flushing process, with particularly noticeable water-saving effects in high-density residential buildings such as dormitories.

[0029] 3. The filtration device provided by this utility model is designed with innovative fluid dynamics to achieve long-term operation without power, which can "ensure smooth flow through coarse filtration and improve water quality through fine filtration". It relies on the height difference of building floors to build a cross-floor gravity flow system without pumps or external energy, forming a closed-loop recycling system for greywater with zero energy consumption, immediate reuse and low maintenance as its core, breaking through the technical bottleneck of water resource recycling in dormitory building scenarios.

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0031] Figure 1 This is a cross-sectional view of a non-powered, multi-level greywater flushing and filtration device provided in this embodiment of the present invention, perpendicular to the horizontal direction.

[0032] Figure 2 This is a cross-sectional view parallel to the horizontal direction of a non-powered, multi-story greywater flushing and filtration device provided in this embodiment of the utility model.

[0033] Figure 3 This is a perspective view of a non-powered, multi-level greywater flushing and filtration device provided in an embodiment of this utility model.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1-Sedimentation and interception compartment; 11-Inlet pipe; 12-Overflow pipe; 13-Filter cotton; 14-Support frame; 2-Filter media compartment; 21-First stage filter media compartment; 211-First vent pipe; 22-Second stage filter media compartment; 23-Third stage filter media compartment; 231-Second vent pipe; 24-Fourth stage filter media compartment; 3-Water storage compartment; 31-Outlet pipe; 4-Baffle; 41-First baffle; 411-First water permeable hole; 42-Second baffle; 421-Second water permeable hole; 43-Third baffle; 431-Third water permeable hole; 44-Fourth baffle; 441-Fourth water permeable hole; 45-Fifth baffle; 451-Fifth water permeable hole. Detailed Implementation

[0036] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following detailed description of a non-powered, multi-level greywater flushing and filtration device based on this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0037] The foregoing and other technical contents, features, and effects of this utility model will be clearly presented in the following detailed description of the specific embodiments with reference to the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding can be gained of the technical means and effects adopted by this utility model to achieve the intended purpose. However, the accompanying drawings are only provided for reference and illustration and are not intended to limit the technical solution of this utility model.

[0038] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multi-level" means two or more, unless otherwise explicitly specified. Moreover, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not explicitly listed.

[0039] This utility model provides a non-powered, multi-level greywater flushing and filtration device, such as... Figures 1 to 3As shown, the filtration device includes a housing located above the current floor, which is any floor below the top floor. The housing contains multiple compartments arranged horizontally as follows: a sedimentation and interception compartment 1, a multi-stage filter media compartment 2, and a water storage compartment 3. Each adjacent compartment is separated by a partition 4, each with permeable holes. The sedimentation and interception compartment 1 has an inlet pipe 11 on its wall, used to receive domestic wastewater from the previous floor; a sedimentation filter layer is installed inside the sedimentation and interception compartment 1. The multi-stage filter media compartments 2 are arranged horizontally, each containing a filter media layer, and are used to obtain recycled water that meets toilet flushing standards. The water storage compartment 3 has an outlet pipe 31 on its wall, used to connect to the toilet flushing tank on the current floor, allowing the water in the storage compartment 3 to be used for toilet flushing on the current floor.

[0040] The filtration device provided by this utility model features a horizontal layout of each compartment, allowing for horizontal integration within the building space. This overcomes the spatial limitations of traditional vertical filtration devices, achieving zero-footprint installation with a thinner structure (height ≤ 50cm). Consequently, this filtration device can directly utilize existing ceiling mezzanine spaces instead of dedicated equipment rooms, saving floor space, reducing costs, and significantly improving the spatial adaptability and versatility of greywater reuse systems.

[0041] The filtration device provided by this utility model can be used in high-density residential buildings such as apartment buildings and hotels; it is especially suitable for buildings with centralized bathrooms, such as student dormitories. In these buildings, the bathrooms and toilets on each floor are relatively fixed in vertical space, making it convenient to collect and treat domestic wastewater using the filtration device. This provides a new water-saving option for the renovation of such dormitories. For example, by installing the filtration device below the centralized bathroom on one floor (excluding the top floor), the wastewater from the upper floor can be recycled and treated to obtain greywater that meets toilet flushing standards, which can then be directly used for flushing toilets on that floor.

[0042] The filtration device provided by this utility model filters large-sized impurities through a sedimentation and interception box 1, and then sequentially passes the water through a multi-stage filter media box 2, ensuring that the filtered greywater meets national standards for toilet flushing. Furthermore, this utility model's non-powered, multi-floor greywater toilet flushing reuse filtration device collects bathing and washing wastewater from the centralized bathroom on the upper floor of a dormitory building, filters it, and then uses it for flushing toilets in the public restrooms on the lower floor, replacing the portion that would otherwise require clean tap water. This achieves "cascade utilization" of water resources, significantly reducing the consumption of municipal tap water in the toilet flushing process, especially in high-density residential buildings like dormitories where water conservation is particularly pronounced. This filtration device utilizes gravity flow for water collection and transport (from upper to lower floors), eliminating the need for external power equipment such as pumps and motors, thus saving energy consumption during operation.

[0043] For example, such as Figure 1 As shown, the sedimentation filter layer includes filter cotton 13 and a support frame 14 disposed below the filter cotton 13. The filter cotton 13 can intercept hair, dander, and large particulate pollutants. The support frame 14 is disposed below the filter cotton 13 to prevent the filter cotton 13 from shifting due to water flow impact during operation.

[0044] For example, the box body can be made of 304 stainless steel; the partition 4 can be made of 304 stainless steel plate welded into the box body to form various compartments.

[0045] In one embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the multi-stage filter media box 2 includes a first-stage filter media box 21, a second-stage filter media box 22, a third-stage filter media box 23, and a fourth-stage filter media box 24 arranged sequentially along the horizontal direction.

[0046] In one embodiment of this utility model, such as Figure 1As shown, the partitions include a first partition 41, a second partition 42, a third partition 43, a fourth partition 44, and a fifth partition 45. A first partition 41 is provided between the sedimentation interception tank 1 and the first-stage filter media tank 21; a second partition 42 is provided between the first-stage filter media tank 21 and the second-stage filter media tank 22; a third partition 43 is provided between the second-stage filter media tank 22 and the third-stage filter media tank 23; a fourth partition 44 is provided between the third-stage filter media tank 23 and the fourth-stage filter media tank 24; and a fifth partition 45 is provided between the fourth-stage filter media tank 24 and the water storage tank 3. A first water permeable hole 411 is provided at the lower end of the first partition 41; a third water permeable hole 431 is provided at the lower end of the third partition 43; and a fifth water permeable hole 451 is provided at the lower end of the fifth partition 45. A second water-permeable hole 421 is provided in the middle of the second partition 42. The height of the filter media layer in the first-stage filter media compartment 21 and the second-stage filter media compartment 22 is lower than the height of the second water-permeable hole 421. A fourth water-permeable hole 441 is provided in the middle of the fourth partition 44. The height of the filter media layer in the third-stage filter media compartment 23 and the fourth-stage filter media compartment 24 is lower than the height of the fourth water-permeable hole 441. The height mentioned here refers to the height perpendicular to the horizontal direction. For example, taking the bottom surface of the box as the horizontal plane, the height perpendicular to the bottom surface of the box.

[0047] In this embodiment, the wastewater filtration process in the filtration device is as follows: Domestic wastewater from the upper floor enters the sedimentation and interception tank 1 through the inlet pipe 11. Within the sedimentation and interception tank 1, the water flows downwards. After the sedimentation filter layer in the sedimentation and interception tank 1 removes larger impurities, the water flows through the first permeable hole 411 at the lower end of the first partition 41 into the first-stage filter media tank 21. In the first-stage filter media tank 21, the water flows upwards. After being filtered by the filter media layer in the first-stage filter media tank 21, it overflows through the second permeable hole 421 in the middle of the second partition 42 into the second-stage filter media tank 22. In the second-stage filter media tank 22, the water flows downwards. After being filtered by the filter media layer in the second-stage filter media tank 22, it overflows through the third permeable hole 431 at the lower end of the third partition 43 into the third-stage filter media tank 23. In the third-stage filter media compartment 23, the water flows upwards. After being filtered by the filter media layer in the third-stage filter media compartment 23, it overflows into the fourth-stage filter media compartment 24 through the fourth permeable hole 441 in the middle of the fourth partition 44. In the fourth-stage filter media compartment 24, the water flows downwards. After being filtered by the filter media layer in the fourth-stage filter media compartment 24, it enters the water storage compartment 3 through the fifth permeable hole 451 at the lower end of the fifth partition 45 and completes the filtration process.

[0048] The first-stage filter media compartment 21 contains ceramic granules, which serve to achieve physical filtration and uniform water flow. In terms of physical filtration, the rough surface and numerous pores of the ceramic granules can intercept suspended solids and impurities (such as silt and colloids) in the water, purifying the water quality through adsorption and retention. Regarding uniform water flow, filling the first-stage filter media compartment 21 with ceramic granules ensures even water distribution, preventing short-circuiting or water erosion of the filter media layer, thus improving filtration stability and efficiency.

[0049] Powdered activated carbon is installed in the second-stage filter media compartment 22 and the fourth-stage filter media compartment 24, which allow water to flow downwards. This reduces the particle size of the filter media, increasing its adsorption capacity and removal efficiency for impurities in the water flow. Granular activated carbon is installed in the third-stage filter media compartment 23, which allows water to flow upwards. This also facilitates uniform water flow and prevents the filter media from becoming suspended in the upward flow, thus reducing its filtration effect and further improving filtration efficiency. The main function of activated carbon is to adsorb and remove organic pollutants, suspended solids, and some chemical substances, such as BOD5, SS, surfactants, and to remove odors.

[0050] In one embodiment of this utility model, such as Figure 2 As shown, the filter media in the first-stage filter media compartment 21 is ceramsite, the filter media in the second-stage filter media compartment 22 is powdered activated carbon, the filter media in the third-stage filter media compartment 23 is granular activated carbon, and the filter media in the fourth-stage filter media compartment 24 is powdered activated carbon. In other words, this embodiment uses a four-stage filtration system consisting of a ceramsite filter media layer, a powdered activated carbon filter media layer, a granular activated carbon filter media layer, and another powdered activated carbon filter media layer. Through alternating upward and downward flow of water, the interaction length and time between the filter media layer and the water flow are extended, achieving the triple advantages of efficient interception of contaminants, anti-clogging self-cleaning, and prevention of filter media loss. This effectively removes suspended solids and organic pollutants from bathing and washing wastewater.

[0051] In one example, the fourth permeable hole 441 is positioned at a lower height than the second permeable hole 421. See also Figure 1 Along the horizontal direction, from the inlet pipe 11 to the outlet pipe 31, the water level in each compartment decreases sequentially. By lowering the setting height of the fourth permeable hole 441, the filtered water can overflow into the water storage compartment 3 in a timely manner.

[0052] In one example, the first water-permeable hole 411, the third water-permeable hole 431, and the fifth water-permeable hole 451 are all equipped with filter media barrier nets, which are used to prevent the filter media in the corresponding filter media compartment from leaking out. It is worth noting that the pore size of the filter media barrier nets needs to be smaller than the particle size of the filter media used in the corresponding filter media compartment.

[0053] For example, an overflow pipe 12 is provided on the wall of the sedimentation interception box 1. The height of the overflow pipe 12 is greater than the height of the second water permeable hole 421, and the height of the overflow pipe 12 is less than the height of the inlet pipe 11.

[0054] In one example, the housing has an openable cover to facilitate troubleshooting, cleaning, or replacement of the filter media.

[0055] In one embodiment of this utility model, such as Figure 1 As shown, the filtration device also includes a vent pipe, which includes a first vent pipe 211 and a second vent pipe 231. Figure 1 The diagram indicates the projected positions of the first vent pipe 211 and the second vent pipe 231 in cross-section. The first vent pipe 211 is located at the lower part of the first-stage filter media box 21, and the second vent pipe 231 is located at the lower part of the third-stage filter media box 23. Here, the lower part can be the lower end of the box wall of the first-stage filter media box 21 or the third-stage filter media box 23, or it can be the bottom of the first-stage filter media box 21 or the third-stage filter media box 23. The first vent pipe 211 and the second vent pipe 231 are used to vent the water in the box.

[0056] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A non-powered, multi-level greywater flushing and filtration device, characterized in that, Includes a housing, which is located above the current floor; the current floor is any floor below the top floor. The box body includes multiple compartments, which are arranged in the horizontal direction as sedimentation interception compartment (1), multi-stage filter media compartment (2) and water storage compartment (3); a partition (4) is provided between any adjacent compartments, and each partition (4) has water permeable holes; The sedimentation interception box (1) is provided with an inlet pipe (11) on its wall, which is used to receive domestic wastewater from the upper floor; The sedimentation interception box (1) is equipped with a sedimentation filter layer; The multi-stage filter media boxes (2) are arranged in a horizontal direction, and each of the filter media boxes (2) is provided with a filter media layer. The multi-stage filter media boxes (2) are used to obtain greywater that meets the standards for toilet flushing. The water storage tank (3) is provided with a water outlet pipe (31) on its tank wall, which is used to connect to the toilet flushing tank of the current floor.

2. The non-powered, multi-level greywater flushing and filtration device according to claim 1, characterized in that, The multi-stage filter media box (2) includes a first-stage filter media box (21), a second-stage filter media box (22), a third-stage filter media box (23), and a fourth-stage filter media box (24) arranged sequentially in the horizontal direction.

3. The non-powered, multi-level greywater flushing and filtration device according to claim 2, characterized in that, The partition includes a first partition (41), a second partition (42), a third partition (43), a fourth partition (44), and a fifth partition (45); the first partition (41) is disposed between the sedimentation interception box (1) and the first-stage filter media box (21), the second partition (42) is disposed between the first-stage filter media box (21) and the second-stage filter media box (22), the third partition (43) is disposed between the second-stage filter media box (22) and the third-stage filter media box (23), the fourth partition (44) is disposed between the third-stage filter media box (23) and the fourth-stage filter media box (24), and the fifth partition (45) is disposed between the fourth-stage filter media box (24) and the water storage box (3); The lower end of the first partition (41) is provided with a first water-permeable hole (411), the lower end of the third partition (43) is provided with a third water-permeable hole (431), and the lower end of the fifth partition (45) is provided with a fifth water-permeable hole (451). The second partition (42) is provided with a second water permeable hole (421) in the middle. The height of the filter layer in the first-stage filter media box (21) and the height of the filter layer in the second-stage filter media box (22) are both lower than the height of the second water permeable hole (421). The fourth partition (44) has a fourth water-permeable hole (441) in the middle. The height of the filter layer in the third-stage filter box (23) and the height of the filter layer in the fourth-stage filter box (24) are both lower than the height of the fourth water-permeable hole (441).

4. The non-powered, multi-level greywater flushing and filtration device according to claim 3, characterized in that, The fourth permeable hole (441) is set at a lower height than the second permeable hole (421).

5. The non-powered, multi-level greywater flushing and filtration device according to claim 4, characterized in that, The first water-permeable hole (411), the third water-permeable hole (431), and the fifth water-permeable hole (450) are all provided with filter media blocking nets, which are used to prevent the filter media in the corresponding filter media box from being lost.

6. The non-powered, multi-level greywater flushing and filtration device according to any one of claims 2-5, characterized in that, The filter media used in the first-stage filter media box (21) is ceramsite, the filter media used in the second-stage filter media box (22) is powdered activated carbon, the filter media used in the third-stage filter media box (23) is granular activated carbon, and the filter media used in the fourth-stage filter media box (24) is powdered activated carbon.

7. The non-powered, multi-level greywater flushing and filtration device according to claim 6, characterized in that, The box has an openable cover.

8. The non-powered, multi-level greywater flushing and filtration device according to claim 7, characterized in that, The sedimentation filter layer includes filter cotton (13) and a support frame (14) disposed below the filter cotton (13).

9. The non-powered, multi-level greywater flushing and filtration device according to claim 8, characterized in that, An overflow pipe (12) is provided on the side wall of the sedimentation interception box (1). The height of the overflow pipe (12) is greater than the height of the second water permeable hole (421), and the height of the overflow pipe (12) is less than the height of the water inlet pipe (11).

10. The non-powered, multi-level greywater flushing and filtration device according to claim 9, characterized in that, It also includes a vent pipe, which includes a first vent pipe (211) and a second vent pipe (231); the first vent pipe (211) is located at the lower part of the first-stage filter media box (21), and the second vent pipe (231) is located at the lower part of the third-stage filter media box (23). The first vent pipe (211) and the second vent pipe (231) are used to vent the water in the box.

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