Folding subsurface flow wetland capable of being produced in batches

Abstract

The utility model discloses a folding type subsurface flow wetland capable of being produced in batch, which relates to the technical field of sewage treatment, and comprises an anti-seepage film and a cushion layer which are paved in a plain soil pit, the cushion layer is filled in a closed area enclosed by the anti-seepage film, the cushion layer comprises a packing layer and a soil mellow layer, the packing layer is paved on the anti-seepage film, and the soil mellow layer is paved on the packing layer. According to the rural domestic sewage treatment device, sewage is treated through a microbial soil infiltration treatment technology, the rural domestic sewage treatment effect is considered, meanwhile, the construction difficulty is small, the occupied area is small, the construction period is shortened, and the construction cost is reduced. The system can be fully integrated into a small vegetable garden or small garden ecological system of a peasant household, protects the farmland cultivation and planting habits of the peasant household, is small in investment and low in cost, and meets the requirements of domestic sewage treatment and recycling in vast rural areas.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a foldable subsurface flow wetland that can be produced in batches. Background Art

[0002] Urban populations typically live in densely populated, concentrated communities, while rural populations, due to geographical factors such as mountainous areas, water-connected areas, and water-scarce northern regions, have small residential plots concentrated in small areas and large, dispersed plots. Rural population density is lower than urban populations, and water availability fluctuates significantly. For decentralized rural domestic sewage, pipe networks are difficult to collect, construction costs are high, and maintenance is challenging. Inadequate pipe collection leads to low water intake. Villages discharge mixed rainwater and sewage, and the existing combined sewer network is of poor quality and severely damaged. During construction, drainage was directed to nearby rivers, streams, and ponds based on topography, resulting in multiple stormwater and sewage outlets per village. Consequently, a centralized drainage system has been established, with most of the drainage used to remove rainwater from the villages. The pipe network is often filled with debris such as domestic garbage, leaves, agricultural straw, and sediment, leading to severe blockage in some sewage pipes. Furthermore, centralized collection and treatment through the pipe network is expensive and difficult to maintain.

[0003] The existing rural sewage treatment facilities directly simplify and miniaturize the large-scale and professionally managed urban sewage treatment process, without considering the characteristics of decentralized rural domestic sewage. This is completely inconsistent with rural reality and also ignores the rich land resources in rural areas and the absorption capacity of agriculture and planting.

[0004] In order to combine the natural ecology and the characteristics of rural sewage, sewage treatment facilities that can be integrated with the rural environment are adopted. Subsurface flow artificial wetlands can treat domestic sewage while also bringing ecological and economic benefits. However, subsurface flow artificial wetlands are usually made of bricks or reinforced concrete. When used for sewage treatment in decentralized rural living areas, due to the high complexity of their construction technology, most rural areas are relatively remote and backward, resulting in great difficulty in later maintenance of the technology; and rural areas are mostly concentrated with vegetable gardens, residential houses, etc., and due to their large area, they cannot provide sufficient land area for the construction of traditional subsurface flow artificial wetlands, which can easily destroy the original ecosystem and farming habits; rural areas are generally economically backward, and sewage treatment facilities need to be both effective and economical. Subsurface flow artificial wetlands are made of bricks or reinforced concrete, with high initial investment costs and high later maintenance costs, and low economic benefits, making them unsuitable for use in rural areas. Utility Model Content

[0005] The purpose of the utility model is to provide a foldable subsurface flow wetland that can be mass-produced to solve the problems existing in the prior art mentioned in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A foldable subsurface flow wetland that can be mass-produced includes an impermeable film and a cushion layer laid in a raw soil pit. The cushion layer is filled in a closed area surrounded by the impermeable film. The cushion layer includes a filler layer and a mature soil layer. The filler layer is laid on the impermeable film, and a water collection pipe system is arranged in the middle of the filler layer. A mature soil layer for plant growth is provided above the filler layer.

[0008] Preferably, the water collection pipe system includes a main pipe and several branch pipes connected to the main pipe. The branch pipes are arranged alternately with the main pipe. The main pipe and the branch pipes are provided with water outlets. One end of the main pipe is connected to the wetland water inlet grille, and the other end of the main pipe is connected to the water outlet sampling well.

[0009] Preferably, the diameter of the main pipe is 50 mm, the diameter of the branch pipe is 25 mm, the diameter of the water outlet holes on the main pipe and the branch pipe is 5-10 mm, the hole center spacing is 150 mm, and the hole openings are downward.

[0010] Preferably, the anti-seepage film is a PVC film or a HDPE film.

[0011] Preferably, a basket grille is installed in the wetland water inlet grille well.

[0012] Preferably, PVC wall panels are installed around the raw soil pit, and the anti-seepage film is laid inside the PVC wall panels.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. This utility model treats sewage through microbial soil infiltration treatment technology, taking into account the treatment effect of rural domestic sewage. It has low construction difficulty, low maintenance requirements, and small footprint. It can be fully integrated into the ecological system of farmers' small vegetable gardens or small gardens, protecting farmers' arable land and farming habits. It has low investment and low cost, so it can meet the requirements of domestic sewage treatment and resource utilization in rural areas.

[0015] 2. The anti-seepage film used in the present invention can be processed in batches in the factory and folded for transportation; it can also be directly processed and installed at the construction site after purchasing the raw materials. Compared with the subsurface flow wetland made of brick or reinforced concrete, the anti-seepage film used in the present invention is easy to process and transport and has little installation difficulty.

[0016] 3. The utility model has high space utilization rate. The foldable subsurface flow artificial wetland realizes multi-layer design in the vertical direction, with high treatment efficiency. Through full and effective contact with the filler and the addition of an anti-seepage film, the water quality of the treated sewage can fully meet the standards, reducing the floor space, without destroying the natural ecology around the farmers, and friendly integration with the farmers' small vegetable gardens or small flower gardens.

[0017] 4. The wetland environment of the utility model is good. Plants and crops are planted on the surface of the wetland. The eutrophication conditions are good. There are no excessive mosquitoes or stinking and blackening caused by poor water quality. The water quality is excellent for a long time. An anti-seepage film is added to the soil ecological absorption pool, and the remaining tail water is discharged nearby in compliance with the standards. It can be connected to small vegetable gardens, small orchards, small flower gardens, woodlands and farmlands for reuse, realizing local resource utilization and absorption, and is closely integrated with the rural ecology.

[0018] 5. The wetland of the utility model has a long operation cycle and is easy to maintain and manage in the later stage. It can be achieved without any personnel maintenance and management. Farmers can grow vegetables or gardens normally to ensure the long-term operation and qualified water output of the foldable subsurface flow artificial wetland. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural plan view of the foldable subsurface flow artificial wetland of the utility model.

[0020] Figure 2 This is a structural cross-sectional view of the foldable subsurface flow artificial wetland of the utility model. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] See also Figure 1-2 , the utility model provides the following technical solutions:

[0023] A foldable subsurface wetland that can be mass-produced includes an anti-seepage film and a cushion layer laid in a raw soil pit. The cushion layer is filled in a closed area surrounded by the anti-seepage film. The anti-seepage film is made of PVC film or HDPE film, formed by thermoplastic method, and the interface is hot-melt welded, similar to an open water bag. The setting of the anti-seepage film avoids damaging the natural ecology around farmers.

[0024] The cushion layer includes a filler layer and a soil layer. The filler layer is laid on an anti-seepage film, and a water collection pipe system is arranged in the middle of the filler layer. The water collection pipe system includes a main pipe and several branch pipes connected to the main pipe. The branch pipes are staggered with the main pipe. The main pipe and the branch pipe are provided with water outlet holes. One end of the main pipe is connected to the wetland water inlet grid mouth. A basket grid is installed in the wetland water inlet grid well, and the other end of the main pipe is connected to the water outlet sampling well; the diameter of the main pipe is 50mm, the diameter of the branch pipe is 25mm, the aperture of the water outlet holes on the main pipe and the branch pipe is 5-10mm, the hole center spacing is 150mm, and the hole mouth is downward. The water collection pipe system can supply water to the subsurface wetland.

[0025] PVC wall panels are installed around the raw soil pit, and the anti-seepage film is laid inside the PVC wall panels. The setting of the PVC wall panels can protect the anti-seepage film.

[0026] A mature soil layer for plant growth is provided above the filler layer. Farmers can plant crops or vegetation on top of the planting soil by themselves; for example, water-resistant vegetables for vegetable gardens: (spring and winter) cucumbers, leaf beets, endive, celery, lettuce, water spinach; (summer and autumn) pear, mulberry, tau tree, elm, wild rice stem, purple cabbage; and water-resistant plants for garden cultivation: (spring and winter) larch, slash pine, metasequoia, Chinese cypress, bald cypress, pear; (summer and autumn) pond cypress, colorful salix, matsudanax, and maple poplar.

[0027] Sewage flows from residents' homes into septic tanks, and after treatment in the septic tanks, it flows into the water inlet grid well of the subsurface wetland. The main pipe diverts the water to the branch pipe to supply water to the filler layer and soil. The excess tail water is discharged from the other end of the main pipe to areas that need irrigation, such as small vegetable gardens, small orchards, small flower gardens, woodlands and farmland, so as to realize local resource utilization and disposal.

[0028] The foldable subsurface flow artificial wetland designed by the utility model has three modes for rural households with 3, 5 and 9 people respectively. It can be built individually or together according to the number of people. The design size parameters are different, but the specific structure, operation mode and construction layout of the process are the same.

[0029] The specific design size parameters of the wetland are: 1 household with 3 people: H1×L1×B1=550mm×3000mm×1000mm, 1 household with 5 people: H1×L1×B1=550mm×3000mm×1000mm, 2 households with 9 people together: H1×L1×B1=550mm×3000mm×1000mm.

[0030] The foldable subsurface flow artificial wetland of the utility model can treat water of a quality that meets the limit values ​​of the "Agricultural Irrigation Water Quality Standard", with a pH value of 5.5-8.5, a COD of 24 mg / L, a SS of 10 mg / L, a BOD5 of 6 mg / L, an anionic surfactant of 1.5 mg / L, a fecal coliform count of 3200 (MPN / L), and a roundworm egg count of 1 (piece / 10L).

[0031] Example 1

[0032] For a household of three people, approximately 0.24m 3 For decentralized rural domestic sewage of / d, the size parameters of artificial wetland are H1×L1×B1=550mm×3000mm×1000mm, and the size parameters of septic tank are H2×L2×B2=780mm×1100mm×690mm.

[0033] The inlet and outlet water quality and treatment effect are as follows:

[0034] Table 1-1 1 household with 3 people 0.24m 3 / d mode inlet and outlet water quality

[0035]

[0036]

[0037] The effluent water quality meets the standard limit values ​​for crop types and vegetables in the "Standards for Agricultural Irrigation Water Quality" (GB 5084-2021).

[0038] Example 2

[0039] For a household of 5 people, approximately 0.4m 3 / d of decentralized rural domestic sewage, the size parameters of the artificial wetland are H1×L1×B1=550mm×3000mm×1500mm, and the size parameters of the septic tank are H2×L2×B2=840mm×1298mm×796mm.

[0040] The inlet and outlet water quality and treatment effect are as follows:

[0041] Table 1-2 1 household with 5 people 0.4m 3 / d mode inlet and outlet water quality

[0042]

[0043]

[0044] The effluent water quality meets the standard limit values ​​for crop types and vegetables in the "Standards for Agricultural Irrigation Water Quality" (GB 5084-2021).

[0045] Example 3

[0046] For two households with 6-9 people, about 0.72m 3 / d of decentralized rural domestic sewage, the size parameters of the artificial wetland are H1×L1×B1=550mm×3000mm×2000mm, and the size parameters of the septic tank are H2×L2×B2=910mm×1620mm×910mm.

[0047] The inlet and outlet water quality and treatment effect are as follows:

[0048] Table 1-3 2 households, 9 people, 0.72m 3 / d mode inlet and outlet water quality

[0049]

[0050]

[0051] The effluent water quality meets the standard limit values ​​for crop types and vegetables in the "Standards for Agricultural Irrigation Water Quality" (GB 5084-2021).

[0052] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A foldable subsurface wetland that can be mass-produced, characterized in that: It includes an anti-seepage film and a cushion layer laid in a raw soil pit. The cushion layer is filled in the closed area surrounded by the anti-seepage film. The cushion layer includes a filler layer and a soil layer. The filler layer is laid on the anti-seepage film, and a water collection pipe system is arranged in the middle of the filler layer. A soil layer for plant growth is provided above the filler layer. PVC wall panels are installed around the raw soil pit, and the anti-seepage film is laid inside the PVC wall panels. The setting of the PVC wall panels can protect the anti-seepage film.

2. The foldable subsurface flow wetland that can be mass-produced according to claim 1 is characterized in that: The water collection pipe system includes a main pipe and several branch pipes connected to the main pipe. The branch pipes are arranged alternately with the main pipe. The main pipe and the branch pipes are provided with water outlet holes. One end of the main pipe is connected to the wetland water inlet grille, and the other end of the main pipe is connected to the water outlet sampling well.

3. The foldable subsurface flow wetland that can be mass-produced according to claim 2 is characterized in that: The diameter of the main pipe is 50 mm, the diameter of the branch pipe is 25 mm, the diameter of the water outlet holes on the main pipe and the branch pipe is 5-10 mm, the hole center spacing is 150 mm, and the hole openings are downward.

4. The foldable subsurface flow wetland that can be mass-produced according to claim 1 is characterized in that: The anti-seepage film is a PVC film or a HDPE film.

5. The foldable subsurface flow wetland that can be mass-produced according to claim 2 is characterized in that: A basket grille is installed in the wetland water inlet grille well.

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