A membrane underdrain for oxidation ponds
By installing plastic drainage boards and vent pipes under the geomembrane of the oxidation pond, combined with a vacuum pump, the problems of water seepage and air expansion under the oxidation pond membrane were solved. This enabled rapid drainage and venting, prevented damage to the geomembrane, reduced maintenance costs, and extended service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WENS FOODSTUFF GROUP CO LTD
- Filing Date
- 2025-07-02
- Publication Date
- 2026-07-03
AI Technical Summary
The existing geomembrane in oxidation ponds is prone to water seepage and gas expansion under the membrane, resulting in poor drainage and ventilation, easy rupture and damage, and there is no effective solution.
Design a sub-membrane venting and drainage device, including a plastic drainage board, a drainage pipe and an venting pipe. A vacuum pump generates negative pressure, which is then combined with HDPE welding rods for hot-melt welding to form a sealed system, enabling the rapid discharge of seepage water and gas.
It improves the efficiency of venting and drainage, prevents the geomembrane from rupturing, reduces maintenance costs, extends the service life of the oxidation pond, and ensures the seepage prevention effect.
Smart Images
Figure CN224451726U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water and air treatment devices, and in particular to a membrane exhaust and drainage device for oxidation ponds. Background Technology
[0002] Oxidation ponds, as a common wastewater treatment and water resource management facility in pig farms, are widely used in many fields. Their core structure typically includes a geomembrane to prevent leakage and groundwater contamination. However, during operation, due to weather, temperature, and other factors, the geomembrane at the bottom of the oxidation pond often experiences air expansion and water seepage. If air is not released and drained in time, the geomembrane can easily rupture and be damaged, rendering it unusable and causing environmental pollution.
[0003] In existing technologies, for seepage under the geomembrane in oxidation ponds, drainage ditches or blind drainage pipes are often installed under the geomembrane for drainage. However, existing drainage structures cannot quickly and effectively drain seepage water, nor can they effectively remove gas.
[0004] Therefore, we need to design a sub-membrane venting and drainage device for oxidation ponds to solve the above problems. Utility Model Content
[0005] The existing drainage structures are unable to quickly and effectively drain seepage water or effectively expel gas. The purpose of this invention is to solve these problems by providing a sub-membrane venting and drainage device for oxidation ponds.
[0006] According to one aspect of the present invention, a sub-membrane venting and drainage device for an oxidation pond is provided, comprising an oxidation pond, wherein the bottom and walls of the oxidation pond are covered with an impermeable membrane, the edge of the impermeable membrane is fixed by an anchoring trench arranged around the edge of the oxidation pond, a plastic drainage board is provided at the bottom of the impermeable membrane, one end of the plastic drainage board is connected to a drainage pipe, the drainage pipe is located at the bottom of the oxidation pond and below the impermeable membrane, one end of the drainage pipe is connected to an venting pipe, and the end of the venting pipe is connected to a vacuum pump.
[0007] In some embodiments, multiple plastic drainage boards are provided, and the multiple plastic drainage boards are distributed parallel to each other and evenly spaced at the bottom of the geomembrane.
[0008] In some embodiments, the spacing between adjacent plastic drainage boards is 5m.
[0009] In some embodiments, the plastic drainage board includes a core board and a filter membrane, the filter membrane being wrapped around the outside of the core board. The core board includes a plurality of vertical plates and a horizontal plate, wherein the horizontal plate divides the plurality of vertical plates into two parts, one part forming a plurality of first channels with the filter membrane and the horizontal plate on the upper side of the core board, and the other part forming a plurality of second channels with the filter membrane and the horizontal plate on the lower side of the core board.
[0010] In some embodiments, multiple plastic drainage boards are connected to drainage pipes via end connectors.
[0011] In some embodiments, the exhaust pipe is disposed on the wall of the oxidation pond, the lower end of the exhaust pipe is connected to a drain pipe, and the upper end of the exhaust pipe extends through the impermeable membrane at the upper edge of the oxidation pond and is connected to a vacuum pump.
[0012] In some embodiments, the core board is made of HDPE material and the filter membrane is made of polypropylene nonwoven fabric.
[0013] In some embodiments, the geomembrane is an HDPE membrane.
[0014] In some embodiments, the plastic drainage board is hot-melt welded to the bottom of the geomembrane using HDPE welding rods.
[0015] The beneficial effects of this utility model are as follows:
[0016] 1. This utility model forms a sealed system by installing a plastic drainage board, drainage pipe, and vent pipe under the geomembrane, with the edges of the geomembrane fixed by anchoring trenches. When the vacuum pump is working, the drainage and vent pipes generate negative pressure to extract seepage water and gas from under the geomembrane, greatly improving drainage and venting efficiency. This drainage and venting device effectively solves the problem of poor drainage and venting caused by air and water accumulation under the geomembrane, eliminates the risk of geomembrane rupture due to air expansion, and overcomes the traditional limitation of having to choose between either drainage or venting.
[0017] 2. This utility model uses HDPE welding rods to hot-melt weld and fix the plastic drainage board, which greatly improves the stability of the connection between the geomembrane and the drainage board, reduces the risk of detachment during construction and operation, and ensures the seepage prevention effect.
[0018] 3. The geomembrane and drainage board made of HDPE material, as well as the PE100 grade polyethylene pipe, have good durability and corrosion resistance. They can maintain stable performance under long-term contact with sewage and complex environments, reducing maintenance costs and environmental risks, and extending the service life of the oxidation pond. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention;
[0020] Figure 2 This is a schematic diagram of the structure of the first embodiment of the geomembrane of this utility model;
[0021] Figure 3 This is a schematic diagram of the structure of the second embodiment of the geomembrane of this utility model;
[0022] Figure 4 This is a schematic diagram of the structure of the plastic drainage board of this utility model;
[0023] Figure 5 This is a schematic diagram of the end connector of this utility model;
[0024] Figure 6 This is a schematic diagram of the structure of the anchoring trench of this utility model.
[0025] In the diagram: 1. Oxidation pond; 2. Geomembrane; 3. Anchoring trench; 4. Plastic drainage board; 41. Core board; 411. Vertical board; 412. Horizontal board; 413. First channel; 414. Second channel; 42. Filter membrane; 5. Drainage pipe; 6. Exhaust pipe; 7. Vacuum water pump; 8. End connector; 81. Flat interface; 82. Circular interface. Detailed Implementation
[0026] The present invention will now be described in further detail with reference to the accompanying drawings.
[0027] The present invention and its embodiments are described below. This description is not restrictive, and the actual embodiments are not limited thereto. In short, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.
[0028] refer to Figure 1-6 This utility model provides a membrane-based exhaust and drainage device for an oxidation pond, comprising an oxidation pond 1, wherein an impermeable membrane 2 is laid on the bottom and walls of the oxidation pond 1, the edge of the impermeable membrane 2 is fixed by an anchoring ditch 3 arranged around the edge of the oxidation pond 1, a plastic drainage board 4 is provided at the bottom of the impermeable membrane 2, one end of the plastic drainage board 4 is connected to a drainage pipe 5, the drainage pipe 5 is located at the bottom of the oxidation pond 1 and below the impermeable membrane 2, one end of the drainage pipe 5 is connected to an exhaust pipe 6, and the end of the exhaust pipe 6 is connected to a vacuum pump 7.
[0029] Specifically, an exhaust pipe 6 is installed on the wall of the oxidation pond 1. The lower end of the exhaust pipe 6 is connected to the drain pipe 5, and the upper end of the exhaust pipe 6 extends through the geomembrane 2 at the upper edge of the oxidation pond 1 and is connected to the vacuum pump 7. The plastic drainage board 4, the drain pipe 5, and the exhaust pipe 6 are covered by the geomembrane 2, and the edge of the geomembrane 2 is pressed into the anchoring trench 3 to form a sealing system. This allows the drain pipe 5 and the exhaust pipe 6 to generate negative pressure when the vacuum pump 7 is working, thereby sucking up seepage water and gas flowing into the plastic drainage board 4.
[0030] In some embodiments, if the end of the exhaust pipe 6 is not connected to the vacuum pump 7, then only the gas accumulated under the geomembrane 2 can be simply vented.
[0031] Multiple plastic drainage boards 4 are provided, and the multiple plastic drainage boards 4 are parallel to each other and evenly spaced at the bottom of the geomembrane 2. The distance between adjacent plastic drainage boards 4 is 5m. In this embodiment, the plastic drainage boards 4 are rectangular.
[0032] The plastic drainage board 4 includes a core board 41 and a filter membrane 42. The filter membrane 42 wraps around the outside of the core board 41. The core board 41 includes multiple vertical plates 411 and horizontal plates 412. The horizontal plates 412 divide the multiple vertical plates 411 into two parts. One part forms multiple first channels 413 with the filter membrane 42 and the horizontal plate 412 on the upper side of the core board 41, and the other part forms multiple second channels 414 with the filter membrane 42 and the horizontal plate 412 on the lower side of the core board 41. The plastic drainage board 4 has the function of allowing water to permeate but preventing sediment from permeating. Water and gas seeping under the geomembrane 2 can flow into the plastic drainage board 4.
[0033] Multiple plastic drainage boards 4 are connected to a drain pipe 5 via end connectors 8. This arrangement allows water and gas from the plastic drainage boards 4 to be drawn into the drain pipe 5 via the end connectors 8. In some embodiments ( Figure 2 The end connector 8 includes a plate interface for connecting to the plastic drainage board 4 and a pipe interface for connecting to the drainage pipe 5. The plate interface and the pipe interface are integrally formed and internally interconnected. The drainage pipe 5 is a long pipe. In some other embodiments ( Figure 3 The end connector 8 is a cross-shaped connector, which includes a body. The body has a flat interface 81 that connects to the plastic drainage plate 4. Circular interfaces 82 on both sides of the flat interface 81 connect to the drain pipe 5. The flat interface 81 and the circular interfaces 82 are internally interconnected. The body, flat interface 81, and circular interfaces 82 are integrally injection molded structures. The upper end of the flat interface 81 is sealed (to prevent blockage of the drain pipe 5; if the upper end of the flat interface 81 is not sealed during pumping, sediment will enter the drain pipe 5 through the upper port). The lower end of the flat interface 81 connects to the plastic drainage plate 4, and the circular interfaces 82 on both sides of the flat interface 81 connect to the drain pipe 5. It should be noted that the drain pipe 5 consists of multiple segments, with adjacent segments connected by cross-shaped connectors.
[0034] Geomembrane 2 is made of HDPE membrane, preferably a 1.0mm HDPE double-sided smooth geomembrane. The plastic drainage board 4 is fixed using HDPE welding rods via hot-melt welding to ensure it will not detach during construction and operation. The plastic drainage board 4 is made of SPB-C HDPE material, with a width ≥120mm, a thickness ≥6mm, and a water flow rate (longitudinal) ≥50cm². 3 / s, compressive strength ≥250kPa, tensile strength ≥1.5kN / 10cm. Specifically, the core board is made of HDPE material; the filter membrane 42 is made of polypropylene nonwoven fabric, which needs to be resistant to acids and alkalis and microbial corrosion (coating basis weight ≥100g / m³). 2 The material has a permeability coefficient ≥ 0.1 cm / s, an equivalent pore size (O90) ≤ 0.075 mm, and a tensile strength ≥ 50 N / cm. The plastic drainage board 4 is hot-melt welded to the bottom of the geomembrane 2 using HDPE welding rods. The HDPE welding rods are HDPE membrane plastic welding rods. The drainage pipe 5 uses a 20mm outer diameter PE100 grade polyethylene pipe to ensure smooth drainage and pipe durability.
[0035] The working principle of this utility model is as follows: During the operation of oxidation pond 1, water and gas seeping from the bottom of the impermeable membrane 2 flow into the first channel 413 of the plastic drainage board 4, and water and gas in the silt flow into the second channel 414 of the plastic drainage board 4. The plastic drainage board 4 uses its good drainage and filtration performance to intercept particulate matter in the sewage, while allowing water and gas to flow quickly into the first channel 413 and the second channel 413 of the plastic drainage board 4, and then discharge it from oxidation pond 1 through vacuum pump 7.
Claims
1. An under-mat exhaust drainage device for an oxidation pond, characterized by, The system includes an oxidation pond (1), the bottom and walls of which are covered with a geomembrane (2). The edge of the geomembrane (2) is fixed by an anchoring ditch (3) set around the edge of the oxidation pond (1). A plastic drainage board (4) is set at the bottom of the geomembrane (2). One end of the plastic drainage board (4) is connected to a drainage pipe (5). The drainage pipe (5) is set at the bottom of the oxidation pond (1) and below the geomembrane (2). One end of the drainage pipe (5) is connected to an exhaust pipe (6). The end of the exhaust pipe (6) is connected to a vacuum pump (7).
2. The subsurface aeration and drainage apparatus for oxidation ponds according to claim 1, characterized in that, Multiple plastic drainage boards (4) are provided, and the multiple plastic drainage boards (4) are parallel to each other and evenly spaced at the bottom of the geomembrane (2).
3. The subsurface aeration and drainage apparatus for oxidation ponds according to claim 2, characterized in that, The distance between adjacent plastic drainage boards (4) is 5m.
4. The subsurface aeration and drainage apparatus for oxidation ponds according to claim 1, characterized in that, The plastic drainage board (4) includes a core board (41) and a filter membrane (42). The filter membrane (42) is wrapped around the outside of the core board (41). The core board (41) includes multiple vertical plates (411) and horizontal plates (412). The horizontal plates (412) divide the multiple vertical plates (411) into two parts. One part forms multiple first channels (413) with the filter membrane (42) and the horizontal plate (412) on the upper side of the core board (41), and the other part forms multiple second channels (414) with the filter membrane (42) and the horizontal plate (412) on the lower side of the core board (41).
5. The under-membrane exhaust and drainage device for an oxidation pond according to claim 2, characterized in that, Multiple plastic drainage boards (4) are connected to drainage pipes (5) via end connectors (8).
6. The subsurface aeration and drainage apparatus for oxidation ponds according to claim 1, characterized in that, The exhaust pipe (6) is installed on the wall of the oxidation pond (1). The lower end of the exhaust pipe (6) is connected to the drain pipe (5). The upper end of the exhaust pipe (6) passes through the impermeable membrane (2) at the upper edge of the oxidation pond (1) and is connected to the vacuum pump (7).
7. The subsurface aeration and drainage apparatus for oxidation ponds according to claim 4, characterized in that, The core board (41) is made of HDPE material, and the filter membrane (42) is made of polypropylene nonwoven fabric.
8. The subsurface aeration and drainage apparatus for oxidation ponds according to claim 1, characterized in that, The geomembrane (2) is an HDPE membrane.
9. The subsurface aeration and drainage apparatus for oxidation ponds according to claim 8, characterized in that, The plastic drainage board (4) is hot-melt welded to the bottom of the geomembrane (2) using HDPE welding rods.