Folding subsurface flow wetland capable of being produced in batches and processing and mounting method of folding subsurface flow wetland

Abstract

The invention discloses a folding subsurface flow wetland capable of being produced in batches and a processing and mounting method thereof, and relates to the technical field of sewage treatment.The folding subsurface flow wetland comprises an anti-seepage film and a cushion layer which are laid in a plain soil pit, the cushion layer is filled in a closed area defined by the anti-seepage film, and the cushion layer comprises a filler layer and a soil mellow layer; the filler layer is laid on the anti-seepage film, a water collecting pipe system is distributed in the middle of the filler layer, and a soil matured layer for plant growth is arranged above the filler layer. 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, and the construction cost is low. 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 invention relates to the technical field of sewage treatment, and in particular to a foldable subsurface flow wetland that can be mass-produced and a processing and installation method thereof. Background Art

[0002] Urban populations usually live in dense and concentrated areas, while rural populations are concentrated in small areas and dispersed in large areas due to geographical factors, such as mountainous areas, water network areas, and water-scarce areas in the north. The rural population density is relatively small compared to that of urban areas, and the water volume fluctuates greatly periodically. For decentralized rural domestic sewage, it is difficult to collect it through pipe networks, the construction cost is high, and it is difficult to maintain. The pipe network does not collect it in place, and the water intake of the facilities is small. The rainwater and sewage in the village are mixed and discharged, and the existing combined pipe network is of poor quality and seriously damaged. During construction, it was discharged into rivers and ponds nearby according to the terrain, resulting in multiple rainwater and sewage outlets in one natural village. Therefore, no centralized drainage system has been formed, and most of them are used to remove rainwater from the village. There are many debris such as domestic garbage, leaves, agricultural straw, and silt in the pipe network, and some sewage pipes are seriously blocked. In addition, the collection and centralized treatment of the pipe network is expensive, and the pipe network is difficult to maintain.

[0003] The existing rural sewage treatment facilities directly simplify and miniaturize the large-scale and professionally managed urban sewage treatment process. They do not take into account the characteristics of decentralized rural domestic sewage, are completely inconsistent with rural realities, and also ignore the fact that rural areas have abundant land resources and the absorption capacity of agriculture and planting industries.

[0004] In order to combine the natural ecology and the characteristics of rural sewage, sewage treatment facilities that can be friendly 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 process, most rural areas are relatively remote and backward, resulting in great difficulty in the later maintenance of the process; and rural areas are mostly concentrated with vegetable gardens, residential houses, etc., and due to their large land area, they cannot provide sufficient land area for the construction of traditional subsurface flow artificial wetlands, which is easy to destroy the original ecosystem and farming habits; rural areas are generally economically backward, and sewage treatment facilities must be both effective and economical. Subsurface flow artificial wetlands are made of bricks or reinforced concrete, with high initial investment costs and later maintenance, and low economic benefits, which are not suitable for use in rural areas. Summary of the invention

[0005] The object of the present invention is to provide a foldable subsurface flow wetland that can be mass-produced and a processing and installation method thereof, so as to solve the problems existing in the prior art mentioned in the above background technology.

[0006] To achieve the above object, 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 soil 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 soil mature soil layer for plant growth is provided above the filler layer.

[0008] Preferably, the water collecting 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 grid port, 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] A method for processing and installing a foldable subsurface wetland that can be mass-produced comprises the following steps:

[0014] S1: Determine the shape of the closed area of ​​the subsurface wetland, and use crushed stone cushion and C15 plain concrete to level the area where the anti-seepage membrane is to be installed;

[0015] S2: The anti-seepage film can be processed in batches according to the specified size in the factory, folded and transported to the site, and the anti-seepage film can be unfolded and installed on the leveled ground so that the anti-seepage film encloses a closed area;

[0016] S3: Arrange the water collection pipe system in the closed area surrounded by the anti-seepage film, and then fill it with mixed wetland filler and soil;

[0017] S4: compacting the back soil at the edge of the original soil pit;

[0018] S5: Connect one end of the main pipe in the water collection system to the septic tank outlet pipe through the wetland's water inlet grid well. The other end of the main pipe is connected to the outlet sampling well at the tail end of the wetland and extended to the area that needs irrigation. The installation of the subsurface wetland is then completed.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention treats sewage by microbial soil infiltration treatment technology, while 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, and has low investment and low cost, so as to meet the requirements of domestic sewage treatment and resource utilization in rural areas.

[0021] 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 wetland built with bricks or poured with reinforced concrete, the anti-seepage film used in the present invention is easy to process and transport, and has little difficulty in installation.

[0022] 3. The present invention has high space utilization rate. The foldable submerged flow artificial wetland realizes multi-layer design in the vertical direction and has high treatment efficiency. Through full and effective contact with the filler and the addition of an impermeable film, the water quality of the treated sewage can fully meet the standards, reducing the floor space, not destroying the natural ecology around the farmers, and friendly integration with the farmers' small vegetable gardens or small flower gardens.

[0023] 4. The wetland environment of the present invention is good, plants and crops are planted on the surface of the wetland, eutrophication conditions are good, there are no excessive mosquitoes, or the water quality is poor and causes stinking and blackening, the water quality is long-term excellent, an impermeable film is added to the soil ecological absorption pool, and the remaining tail water is discharged nearby in compliance with the standards, and can be connected to small vegetable gardens, small orchards, small flower gardens, woodlands and farmlands for reuse, realizing local resource utilization and absorption, and closely integrating with the rural ecology.

[0024] 5. The wetland of the present invention 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 plant vegetables or gardens normally to ensure the long-term operation and qualified water output of the foldable submerged flow artificial wetland. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural plan view of the foldable submerged flow artificial wetland of the present invention.

[0026] Figure 2 It is a structural cross-sectional view of the foldable submerged flow artificial wetland of the present invention. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0028] See also Figure 1-2 , the present invention provides the following technical solutions:

[0029] 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, which is formed by thermoplastic method. The interface is hot-melt welded, similar to an open water bag. The provision of the anti-seepage film avoids damaging the natural ecology around farmers.

[0030] The cushion layer includes a filling layer and a soil layer. The filling layer is laid on an impermeable film, and a water collecting pipe system is arranged in the middle of the filling layer. The water collecting pipe system includes a main pipe and a plurality of branch pipes connected to the main pipe. The branch pipes are arranged alternately with the main pipe. Water outlet holes are provided on the main pipe and the branch pipe. One end of the main pipe is connected to the wetland water inlet grid opening. 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, and the diameter of the branch pipe is 25mm. The aperture diameter 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 opening is downward. The water collecting pipe system can supply water to the subsurface wetland.

[0031] 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.

[0032] A mature soil layer for plant growth is provided above the filling layer. Farmers can plant crops or vegetation on the planting soil by themselves; for example, water-resistant vegetables in the vegetable garden: (spring and winter) cucumbers, leaf beets, endive, celery, lettuce, water spinach; (summer and autumn) pear, mulberry, tau tree, elm, wild rice stem, and purple-backed cabbage; water-resistant plants in the garden: (spring and winter) larch, slash pine, metasequoia, Chinese cypress, baldcypress, pear; (summer and autumn) pond cypress, colorful salix, matsudanax, and poplar.

[0033] Sewage flows from residents' households 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 pipes 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, orchards, flower gardens, woodlands and farmland, to achieve local resource utilization and disposal.

[0034] The present invention also provides a method for processing and installing a foldable subsurface wetland that can be mass-produced, comprising the following steps:

[0035] S1: Determine the shape of the closed area of ​​the subsurface wetland, and use crushed stone cushion and C15 plain concrete to level the area where the anti-seepage membrane is to be installed;

[0036] S2: The anti-seepage film can be processed in batches according to the specified size in the factory, folded and transported to the site, and the anti-seepage film can be unfolded and installed on the leveled ground so that the anti-seepage film encloses a closed area;

[0037] S3: Arrange the water collection pipe system in the closed area surrounded by the anti-seepage film, and then fill it with mixed wetland filler and soil;

[0038] S4: compacting the back soil at the edge of the original soil pit;

[0039] S5: Connect one end of the main pipe in the water collection system to the septic tank outlet pipe through the wetland's water inlet grid well. The other end of the main pipe is connected to the outlet sampling well at the tail end of the wetland and extended to the area that needs irrigation. The installation of the subsurface wetland is then completed.

[0040] The foldable subsurface artificial wetland designed by the present invention has three modes for rural households with 3, 5 and 9 people respectively. It is built individually or jointly 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.

[0041] The specific design size parameters of the wetland are: 1 household with 3 persons: H1×L1×B1=550mm×3000mm×1000mm, 1 household with 5 persons: H1×L1×B1=550mm×3000mm×1000mm, 2 households with 9 persons: H1×L1×B1=550mm×3000mm×1000mm.

[0042] The foldable submerged flow artificial wetland of the present invention can achieve the limit value of the "Agricultural Irrigation Water Quality Standard" after the water is treated, 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).

[0043] Example 1

[0044] For a household of 3 people, approximately 0.24m 3 For decentralized rural domestic sewage that handles / d, the size parameters of the artificial wetland are H1×L1×B1=550mm×3000mm×1000mm, and the size parameters of the septic tank are H2×L2×B2=780mm×1100mm×690mm.

[0045] The inlet and outlet water quality and treatment effect are as follows:

[0046] Table 1-1 1 household with 3 people 0.24m 3 / d mode inlet and outlet water quality

[0047]

[0048]

[0049] The effluent water quality meets the standard limit values ​​for crop types and vegetables in the "Agricultural Irrigation Water Quality Standard" (GB 5084-2021).

[0050] Example 2

[0051] For a household of 5 people, about 0.4m 3 / d of decentralized rural domestic sewage, the size parameters of artificial wetland are H1×L1×B1=550mm×3000mm×1500mm, and the size parameters of septic tank are H2×L2×B2=840mm×1298mm×796mm.

[0052] The inlet and outlet water quality and treatment effect are as follows:

[0053] Table 1-2 1 household with 5 people 0.4m 3 / d mode inlet and outlet water quality

[0054]

[0055]

[0056] The effluent water quality meets the standard limit values ​​for crop types and vegetables in the "Agricultural Irrigation Water Quality Standard" (GB 5084-2021).

[0057] Example 3

[0058] For 2 households with 6-9 people, about 0.72m 3 / d of decentralized rural domestic sewage, the size parameters of artificial wetland are H1×L1×B1=550mm×3000mm×2000mm, and the size parameters of septic tank are H2×L2×B2=910mm×1620mm×910mm.

[0059] The inlet and outlet water quality and treatment effect are as follows:

[0060] Table 1-3 2 households, 9 people, 0.72m 3 / d mode inlet and outlet water quality

[0061]

[0062] The effluent water quality meets the standard limit values ​​for crop types and vegetables in the "Agricultural Irrigation Water Quality Standard" (GB 5084-2021).

[0063] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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 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 soil 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 soil mature soil layer is arranged above the filler layer for plant growth.

2. The foldable subsurface wetland that can be mass-produced according to claim 1 is characterized by: The water collecting 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 grid port, and the other end of the main pipe is connected to the water outlet sampling well.

3. The foldable subsurface wetland that can be mass-produced according to claim 2 is characterized in that: The diameter of the main pipe is 50mm, the diameter of the branch pipe is 25mm, the diameter 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 openings are downward.

4. The foldable subsurface 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 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.

6. The foldable subsurface wetland that can be mass-produced according to claim 1 is characterized by: PVC wall panels are installed around the raw soil pit, and the anti-seepage film is laid inside the PVC wall panels.

7. A method for processing and installing a foldable subsurface wetland capable of being mass-produced as claimed in any one of claims 1 to 6, characterized in that: The steps include: S1: Determine the shape of the closed area of ​​the subsurface wetland, and use crushed stone cushion and C15 plain concrete to level the area where the anti-seepage membrane is to be installed; S2: The anti-seepage film can be processed in batches according to the specified size in the factory, folded and transported to the site, and the anti-seepage film can be unfolded and installed on the leveled ground so that the anti-seepage film encloses a closed area; S3: Arrange the water collection pipe system in the closed area surrounded by the anti-seepage film, and then fill it with mixed wetland filler and soil; S4: compacting the back soil at the edge of the original soil pit; S5: Connect one end of the main pipe in the water collection system to the septic tank outlet pipe through the wetland's water inlet grid well. The other end of the main pipe is connected to the outlet sampling well at the tail end of the wetland and extended to the area that needs irrigation. The installation of the subsurface wetland is then completed.

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