Modular ecological filter system for rural grey water treatment

Abstract

The invention belongs to the technical field of rural sewage treatment, and discloses a modular ecological filter system for rural grey water treatment, which comprises an oil separation sedimentation tank, an ecological filter and an adjusting tank, the water inlet end of the oil separation sedimentation tank adopts a distribution pipe for multi-point water inlet, and the water outlet end is provided with a scum baffle and a water outlet weir plate; the oil separation sedimentation tank is communicated with the regulating tank through an upper-layer perforated pipe penetrating through the ecological filter tank; the ecological filter tank sequentially comprises undisturbed soil, a lower gravel layer, a middle gravel layer, a gravel supporting layer, an upper gravel layer, a fine sand layer, a planting soil layer and wetland plants from bottom to top; the lower part of the adjusting tank is communicated with the ecological filter tank through a lower-layer perforated pipe; overflow pipes are arranged at the tail ends of the adjusting tanks. The modular design is adopted, so that the structure is compact, installation is easy, and construction is fast; the organic combination of the oil separation sedimentation tank, the adjusting tank and the biological filter tank not only can overcome the treatment difficulties of much greasy dirt and large water volume change in rural grey water, but also can utilize the ecological filter tank to infiltrate and supplement underground water, so as to realize the resource utilization of grey water.

Description

Technical Field

[0001] The present invention belongs to the technical field of rural sewage treatment, and in particular relates to a modular ecological filter system for rural grey water treatment. Background Art

[0002] Rural greywater refers to domestic wastewater other than toilet wastewater, primarily including washing and kitchen wastewater. It accounts for approximately 70% of total rural domestic wastewater. We should actively explore low-cost rural domestic wastewater treatment technologies and models tailored to rural conditions. We should promote modular processes that integrate engineering and ecological approaches, and promote the local resource utilization of rural domestic wastewater. Therefore, the collection and resource utilization of rural greywater is of great significance for reducing water pollution and improving the quality of the rural living environment.

[0003] Rural greywater does not contain fecal pollutants, resulting in lower concentrations of pollutants and fewer pathogens. However, because it contains kitchen wastewater, it is often oily and can easily clog treatment equipment if not handled properly. Furthermore, due to residents' "sunrise-to-sunset" lifestyle, the instantaneous flow of greywater peaks in the morning, noon, and evening. During other periods, when water consumption is lower, the instantaneous flow troughs, resulting in significant fluctuations in water volume. Furthermore, the relatively scattered distribution of houses in rural areas makes it difficult to uniformly collect and treat greywater over large areas. Due to the large fluctuations in flow and scattered distribution of rural greywater, the use of traditional urban domestic sewage treatment processes and facilities not only requires high investment and dispersed facilities, but also high operating costs. Furthermore, the effluent is not effectively utilized as a resource. Therefore, the treatment of rural greywater has always been a key and challenging issue in rural water environment management. Summary of the Invention

[0004] The present invention focuses on solving the problems of high investment, scattered facilities, high operating costs and ineffective resource utilization of effluent in existing rural sewage treatment. It provides a modular ecological filter system for rural grey water treatment. The modular design makes the overall structure compact, simple to install and quick to construct. The organic combination of oil separation sedimentation tank, regulating tank and biological filter can not only overcome the difficulties in treating rural grey water with high oil content and large water volume fluctuations, but also can use the ecological filter to infiltrate and replenish groundwater, thereby realizing resource utilization of grey water.

[0005] In order to achieve the above-mentioned object of the invention, the present invention is implemented through the following technical solutions:

[0006] The present invention provides a modular ecological filter system for rural greywater treatment, comprising a tank body; the tank body is composed of an oil separation sedimentation tank, an ecological filter tank, and a regulating tank arranged in sequence;

[0007] The water inlet end of the oil separation sedimentation tank is provided with an inlet pipe and a distribution pipe, and a plurality of the distribution pipes are spaced apart at the water inlet end of the oil separation sedimentation tank; the water outlet end of the oil separation sedimentation tank is provided with a scum baffle and a water outlet weir plate, and the scum baffle is located at the front end of the water outlet weir plate; the ecological filter tank includes, from bottom to top, original soil, a lower gravel layer, a middle gravel layer, a gravel support layer, an upper gravel layer, a fine sand layer, a planting soil layer, and wetland plants; the water outlet end of the regulating tank is provided with an overflow pipe;

[0008] The oil separation sedimentation tank is connected to the regulating tank through an upper perforated pipe passing through the ecological filter tank; multiple upper perforated pipes are arranged in the gravel support layer; when the water inflow of the ecological filter tank exceeds its processing rate, the incoming water will enter the regulating tank through the upper perforated pipe and be temporarily stored in the regulating tank; at the same time, the gray water temporarily stored in the regulating tank can enter the ecological filter tank for disposal during the flow trough period;

[0009] The lower part of the regulating tank is connected to the ecological filter tank through a lower perforated pipe, and a plurality of lower perforated pipes are arranged in the lower gravel layer.

[0010] Preferably, the volume ratio of the oil separation sedimentation tank, the ecological filter tank, and the regulating tank is 1:(2-5):(2-5).

[0011] Preferably, the number of the distribution pipes is at least 2 and they are distributed at equal intervals, and the center distance between adjacent distribution pipes is 300-500 mm.

[0012] Preferably, the top of the scum baffle is 150-300 mm higher than the normal water level in the oil separation sedimentation tank.

[0013] Preferably, the top of the outlet weir plate is 0-100 mm lower than the normal water level in the oil separation sedimentation tank.

[0014] Preferably, the thickness of the lower gravel layer is 200-400mm, and the gravel particle size is 10-20mm; the thickness of the middle gravel layer is 200-400mm, and the gravel particle size is 20-30mm; the thickness of the gravel support layer is 150-300mm, and the gravel particle size is 30-40mm; the thickness of the upper gravel layer is 100-200mm, and the gravel particle size is 20-30mm; the thickness of the fine sand layer is 100-200mm; and the thickness of the planting soil layer is 300-500mm.

[0015] Preferably, the bottom elevation of the overflow pipe is consistent with the water level in the oil separation sedimentation tank.

[0016] Preferably, the number of the upper perforated tubes is at least 2 and they are evenly spaced, and the center spacing between adjacent upper perforated tubes is 300-500 mm; the lower half of the tube wall of each upper perforated tube is provided with water distribution holes evenly distributed along the axial direction, and adjacent water distribution holes are staggered up and down.

[0017] Preferably, the number of the lower perforated tubes is at least 2 and they are evenly spaced, and the center spacing between adjacent lower perforated tubes is 300-500mm; the lower half of each lower perforated tube is provided with water distribution holes evenly distributed along the axial direction, and adjacent water distribution holes are staggered up and down.

[0018] The beneficial effects of the present invention are:

[0019] (1) The modular ecological filter system for rural gray water treatment of the present invention has a modular tank body, a compact overall structure, a shallow burial depth, simple installation, fast construction and low cost.

[0020] (2) The modular ecological filter system for rural gray water treatment of the present invention has an oil separation sedimentation tank at the front end, which can not only remove the grease often present in the gray water, but also precipitate the suspended matter in the gray water at the bottom, thereby achieving the purpose of removing suspended matter, avoiding grease or suspended matter from clogging the ecological filter, and effectively reducing the maintenance work of the ecological filter.

[0021] (3) The modular ecological filter system for rural gray water treatment of the present invention has a regulating tank at the rear end, which can effectively avoid overflow caused by excessive instantaneous gray water flow and untimely treatment of the ecological filter.

[0022] (4) The present invention provides a modular ecological filter system for rural gray water treatment. The ecological filter is layered with gravel and fine sand of different particle sizes and thicknesses, which is conducive to the rapid infiltration of gray water into the land and is not easy to clog. At the same time, wetland plants are planted on the upper layer. While beautifying the environment, the plants can absorb part of the gray water, thereby enhancing the treatment capacity of the ecological filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a front view structural diagram of the modular ecological filter system provided by the present invention;

[0024] Figure 2 It is a schematic diagram of the top structure of the modular ecological filter system provided by the present invention.

[0025] In the figure: 1—tank body; 2—oil separator; 3—biological filter; 4—regulating tank; 5—original soil; 6—lower gravel layer; 7—middle gravel layer; 8—gravel support layer; 9—upper gravel layer; 10—fine sand layer; 11—planting soil layer; 12—wetland plants; 13—scum baffle; 14—outlet weir plate; 15—upper perforated pipe; 16—lower perforated pipe; 17—water inlet pipe; 18—distribution pipe; 19—overflow pipe. DETAILED DESCRIPTION

[0026] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0027] like Figure 1 and Figure 2 As shown, this embodiment provides a modular ecological filter system for rural grey water treatment, which adopts a modular design. The incoming water passes through the oil separation sedimentation tank 2, the ecological filter 3, and the regulating tank 4 in sequence. Most of the rural grey water can be infiltrated into the ecological filter 3 to replenish groundwater and be absorbed by wetland plants 12. A small amount of excess grey water overflows and is discharged through the overflow pipe 19 of the regulating tank 4.

[0028] The modular ecological filter system includes a tank body 1, which is preferably made of 304 stainless steel. The tank body 1 is composed of an oil separation sedimentation tank 2, an ecological filter tank 3, and a regulating tank 4 arranged in sequence.

[0029] As a preferred embodiment, the volume ratio of the oil separation sedimentation tank 2, the ecological filter 3, and the regulating tank 4 is 1:(2-5):(2-5), and the total volume can be set differently according to the number of people served.

[0030] The water inlet of the grease trap 2 is equipped with multiple distribution pipes 18, arranged parallel and evenly spaced. Each distribution pipe 18 is connected to the water inlet pipe 17 at one end and to the grease trap 2 at the other. This multi-point water inlet through the distribution pipes 18 prevents significant disturbance of the surface oil and bottom sediment within the grease trap 2 caused by the sudden high flow of graywater during the morning, afternoon, and evening hours in rural areas. Typically, the grease trap is desilted once or twice annually.

[0031] As a preferred embodiment, the number of the distribution pipes 18 is at least 2, and the center distance between the pipes is preferably 300-500 mm. In this embodiment, the distribution pipes 18 are UPVC pipes with a diameter of 80 mm.

[0032] The outlet of the oil-water separator 2 is equipped with a scum baffle 13 and an outlet weir 14. The scum baffle 13 is located in front of the outlet weir 14. The scum baffle 13 prevents oil from entering the ecological filter 3, effectively reducing the risk of clogging. The outlet weir 14 ensures more stable outlet water and better sedimentation.

[0033] As a preferred embodiment, the top of the scum baffle 13 should be 150-300 mm higher than the normal water level in the oil separation sedimentation tank 2. In this embodiment, the scum baffle 13 has a height of 300-350 mm, a thickness of 3 mm, and is made of SS316L stainless steel.

[0034] As a preferred embodiment, the top of the outlet weir plate 14 should be 0-100 mm lower than the normal water level in the oil separation sedimentation tank 2. In this embodiment, the outlet weir plate 14 has a height of 250-350 mm, a thickness of 3 mm, and is made of corrosion-resistant carbon steel.

[0035] From bottom to top, the ecological filter 3 comprises, in order, undisturbed soil 5, a lower crushed stone layer 6, a middle crushed stone layer 7, a gravel support layer 8, an upper crushed stone layer 9, a fine sand layer 10, a planting soil layer 11, and wetland plants 12. This layered structure of the ecological filter 3 facilitates rapid infiltration of graywater and prevents clogging. The wetland plants 12, while beautifying the environment, absorb some of the graywater, enhancing the ecological filter 3's treatment capacity.

[0036] The ecological filter 3 is arranged in layers with gravel and fine sand of different particle sizes and thicknesses. As a preferred embodiment, from bottom to top, the thickness of the lower gravel layer 6 in the ecological filter 3 is 200-400mm, and the gravel particle size is 10-20mm; the thickness of the middle gravel layer 7 is 200-400mm, and the gravel particle size is 20-30mm; the thickness of the gravel support layer 8 is 150-300mm, and the gravel particle size is 30-40mm; the thickness of the upper gravel layer 9 is 100-200mm, and the gravel particle size is 20-30mm; the thickness of the fine sand layer 10 is 100-200mm; and the thickness of the planting soil layer 11 is 300-500mm.

[0037] The wetland plants 12 planted in the ecological filter 3 should be adapted to the local climate conditions, and preferably reeds, cannas, etc. Generally, the wetland plants 12 are pruned 1-2 times a year.

[0038] An overflow pipe 19 is provided at the outlet of the regulating tank 4. The bottom elevation of the overflow pipe 19 is consistent with the normal water level in the oil separation sedimentation tank 2, ensuring that the water can overflow and be discharged in time when the inlet flow exceeds the processing capacity of the system.

[0039] The oil-water separation sedimentation tank 2 is connected to the regulating tank 4 through the ecological filter 3 using upper perforated pipes 15. Multiple upper perforated pipes 15 are arranged in the gravel support layer 8 of the ecological filter 3. One end of each upper perforated pipe 15 is connected to the oil-water separation sedimentation tank 2 and the other end is connected to the regulating tank 4. The center spacing between adjacent upper perforated pipes 15 is preferably 300-500mm. In this embodiment, the upper perforated pipes 15 are UPVC pipes with a diameter of 100mm. The effluent from the oil-water separation sedimentation tank 2 enters the ecological filter 3 and is distributed through multiple upper perforated pipes 15. This water distribution method ensures that the gray water enters the ecological filter 3 more evenly. In addition, due to the large fluctuations in the flow rate of gray water in rural areas, when the inflow flow rate of the ecological filter 3 exceeds its processing rate, the incoming water will enter the regulating tank 4 through the upper perforated pipes 15 and be temporarily stored in the regulating tank 4 to prevent water from bubbling up in the ecological filter 3 due to untimely treatment. At the same time, the gray water temporarily stored in the regulating tank 4 can enter the ecological filter 3 for disposal during the flow trough period.

[0040] The lower portion of the regulating tank 4 is connected to the ecological filter 3 via lower perforated pipes 16. Multiple lower perforated pipes 16 are arranged in the lower gravel layer 6 of the ecological filter 3. The center-to-center spacing between adjacent lower perforated pipes 16 is preferably 300-500 mm. In this embodiment, the lower perforated pipes 16 are UPVC pipes with a diameter of 100 mm. When the liquid level in the regulating tank 4 drops below the bottom elevation of the upper perforated pipes 15, the graywater stored in the regulating tank 4 can continue to infiltrate into the ecological filter 3 through the lower perforated pipes 16, allowing for timely absorption and better response to the next flow peak.

[0041] The upper perforated tube 15 and the lower perforated tube 16 are both arranged horizontally, and the lower half of the tube wall is provided with water distribution holes evenly distributed along the axial direction, and adjacent water distribution holes are staggered in an upper and lower manner.

[0042] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms of specific changes without departing from the scope of protection of the invention and the claims. These all fall within the scope of protection of the present invention.

Claims

1. A modular ecological filter system for rural greywater treatment, comprising a tank body; characterized in that: The tank body is composed of an oil separation sedimentation tank, an ecological filter tank, and a regulating tank arranged in sequence; The water inlet end of the oil separation sedimentation tank is provided with an inlet pipe and a distribution pipe, and a plurality of the distribution pipes are spaced apart at the water inlet end of the oil separation sedimentation tank; the water outlet end of the oil separation sedimentation tank is provided with a scum baffle and a water outlet weir plate, and the scum baffle is located at the front end of the water outlet weir plate; the ecological filter tank includes, from bottom to top, original soil, a lower gravel layer, a middle gravel layer, a gravel support layer, an upper gravel layer, a fine sand layer, a planting soil layer, and wetland plants; the water outlet end of the regulating tank is provided with an overflow pipe; The oil separation sedimentation tank is connected to the regulating tank through an upper perforated pipe passing through the ecological filter tank; multiple upper perforated pipes are arranged in the gravel support layer; when the water inflow of the ecological filter tank exceeds its processing rate, the incoming water will enter the regulating tank through the upper perforated pipe and be temporarily stored in the regulating tank; at the same time, the gray water temporarily stored in the regulating tank can enter the ecological filter tank for disposal during the flow trough period; The lower part of the regulating tank is connected to the ecological filter tank through a lower perforated pipe, and a plurality of lower perforated pipes are arranged in the lower gravel layer.

2. A modular ecological filter system for rural greywater treatment according to claim 1, characterized in that: The volume ratio of the oil separation sedimentation tank, the ecological filter tank and the regulating tank is 1:(2-5):(2-5).

3. The modular ecological filter system for rural greywater treatment according to claim 1, characterized in that: The number of the distribution pipes is at least 2 and they are distributed at equal intervals, and the center distance between adjacent distribution pipes is 300-500 mm.

4. The modular ecological filter system for rural greywater treatment according to claim 1, characterized in that: The top of the scum baffle is 150-300 mm higher than the normal water level in the oil separation sedimentation tank.

5. The modular ecological filter system for rural greywater treatment according to claim 1, characterized in that: The top of the outlet weir plate is 0-100 mm lower than the normal water level in the oil separation sedimentation tank.

6. The modular ecological filter system for rural greywater treatment according to claim 1, characterized in that: The thickness of the lower gravel layer is 200-400mm, and the gravel particle size is 10-20mm; the thickness of the middle gravel layer is 200-400mm, and the gravel particle size is 20-30mm; the thickness of the gravel support layer is 150-300mm, and the gravel particle size is 30-40mm; the thickness of the upper gravel layer is 100-200mm, and the gravel particle size is 20-30mm; the thickness of the fine sand layer is 100-200mm; and the thickness of the planting soil layer is 300-500mm.

7. The modular ecological filter system for rural greywater treatment according to claim 1, characterized in that: The bottom elevation of the overflow pipe is consistent with the water level in the oil separation sedimentation tank.

8. The modular ecological filter system for rural greywater treatment according to claim 1, characterized in that: The number of the upper perforated tubes is at least 2 and they are evenly spaced, and the center spacing between adjacent upper perforated tubes is 300-500mm; the lower half of the tube wall of each upper perforated tube is provided with water distribution holes evenly distributed along the axial direction, and adjacent water distribution holes are staggered up and down.

9. The modular ecological filter system for rural greywater treatment according to claim 1, characterized in that: The number of the lower layer perforated tubes is at least 2 and they are evenly spaced, and the center spacing between adjacent lower layer perforated tubes is 300-500mm; the lower half of the tube wall of each lower layer perforated tube is provided with water distribution holes evenly distributed along the axial direction, and adjacent water distribution holes are staggered up and down.

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