Rainwater ecological filter

Abstract

The utility model provides an ecological rainwater filter and belongs to the field of water treatment. The ecological filter tank comprises a tank wall and a tank bottom, the tank wall is a retaining wall higher than the ground, a waterproof layer is laid on the tank bottom, a water pipe layer is arranged above the waterproof layer, and a gravel layer and a filter substrate layer are sequentially laid above the water pipe layer; a precipitation layer is formed between the filtering substrate layer and the top end surface of the retaining wall; a water collecting pipe is horizontally laid in the water pipe layer along the waterproof layer, a plurality of water seepage pipes are connected to the water collecting pipe, and air pipes are vertically connected to the tail ends of the water seepage pipes. Rainwater is discharged into a lake after being subjected to physical, chemical and biological multiple-effect standard treatment, and the safety of water quality is guaranteed. The ecological filter tank can purify rainwater, and the aquatic plants planted on the surface of the ecological filter tank also play a role in beautifying the environment.

Description

Technical Field

[0001] The utility model belongs to the field of water treatment, and particularly relates to a rainwater ecological filter tank. Background Art

[0002] In recent years, with the shortage of water resources, the reuse of rainwater and domestic sewage after treatment has gradually become a hot topic. In traditional municipal engineering, after rainwater is collected by the road drainage system, it is generally directly discharged into lakes. Since rainwater often contains various impurities such as road oil stains when flowing from the road surface into the pipe network, the water quality discharged into the lakes does not meet the standards, which has a serious impact on the lake ecosystem. There are also pretreatment systems, such as sedimentation tanks and filtration tanks, to collect and centrally treat rainwater, but there are disadvantages such as being unsightly and having low treatment efficiency. Content of the Utility Model

[0003] In order to solve the above technical problems, the present invention provides a rainwater ecological filter tank.

[0004] The technical solution of the utility model is as follows:

[0005] A rainwater ecological filter tank, the ecological filter tank includes a pool wall and a pool bottom. The pool wall is a retaining wall higher than the ground. The pool bottom is provided with a waterproof layer. Above the waterproof layer, there is a water pipe layer. Above the water pipe layer, a gravel layer and a filter matrix layer are sequentially laid. A sedimentation layer is formed between the top surface of the filter matrix layer and the retaining wall. In the water pipe layer, a collecting water pipe is horizontally laid along the waterproof layer. A plurality of water seepage pipes are connected to the collecting water pipe, and the end of the water seepage pipe is vertically connected with an air pipe.

[0006] Further, the ecological filter tank is inclined and arranged on the outside of the lake. A drainage area is provided between the ecological filter tank and the lake. A drainage port communicating with the drainage area is opened on one side of the retaining wall, and the water outlet of the collecting water pipe is communicated with the drainage port.

[0007] Further, a circulation pump is connected to the water outlet of the collecting water pipe.

[0008] Further, the air pipe is arranged upward along the retaining wall, and its top end is located above the sedimentation layer.

[0009] Further, the waterproof layer includes a first geotextile layer, a waterproof membrane layer and a second geotextile layer laid flat in sequence from bottom to top.

[0010] Further, the shape of the ecological filter tank is a special-shaped structure. The two ends of the pool bottom are arranged to slope upward to form a protection area, and the outer ends of the protection area are flush with the ground.

[0011] Furthermore, the upper surface of the protection area is planted with turf, and the upper surface of the filter matrix layer is planted with aquatic plants.

[0012] The ecological filter pond of the present application forms a four - layer filtration mechanism, including biological treatment by aquatic plants, physical treatment by the filter matrix layer and gravel layer, and chemical treatment in the aerobic zone, which can efficiently remove pollutants such as organic matter, nitrogen, phosphorus, and solid impurities in rainwater. After the rainwater is treated through multiple physical, chemical, and biological effects and meets the standards, it is discharged into the lake, ensuring the safety of water quality.

[0013] The ecological filter pond of the present application has strong environmental adaptability and can adapt to changes in different water qualities, water volumes, and climate conditions, and can effectively carry out treatment and purification. At the same time, the plants and microbial communities in the ecological filter pond also have strong stress resistance and can resist interference and damage from the external environment to a certain extent.

[0014] The ecological filter pond of the present application can not only purify rainwater, but also the aquatic plants planted on its surface play a role in beautifying the environment. In addition, there is almost no operating energy consumption, mainly relying on natural light, temperature, and wind to complete the growth of plants and the reproduction of microorganisms. At the same time, the growth and metabolic processes of plants and microorganisms can automatically complete the purification and restoration of rainwater, greatly reducing operating costs and energy consumption. Brief Description of the Drawings

[0015] Figure 1 is a transverse sectional view of the present application;

[0016] Figure 2 is a top view of the present application;

[0017] Figure 3 is a transverse sectional view of the present application.

[0018] In the figure, 1 - retaining wall, 2 - filter matrix layer, 3 - gravel layer, 4 - water pipe layer, 5 - waterproof layer, 51 - first geotextile layer, 52 - waterproof membrane layer, 53 - second geotextile layer, 6 - sedimentation layer, 7 - drainage area, 8 - collecting pipe, 9 - permeable pipe, 10 - air pipe. Detailed Embodiment

[0019] The following will introduce the detailed embodiment of the present invention in combination with the drawings.

[0020] As Figures 1-3 shown, a rainwater ecological filter pond, the ecological filter pond includes a pool wall and a pool bottom, the pool wall is a retaining wall 1 higher than the ground, the pool bottom is provided with a waterproof layer 5, a water pipe layer 4 is provided above the waterproof layer 5, a gravel layer 3 and a filter matrix layer 2 are sequentially laid above the water pipe layer 4; a sedimentation layer 6 is formed between the top surface of the filter matrix layer 2 and the retaining wall 1; a collecting pipe 8 is horizontally laid along the waterproof layer 5 in the water pipe layer 4, a plurality of permeable pipes 9 are connected to the collecting pipe 8, and an air pipe 10 is vertically connected to the end of the permeable pipe 9.

[0021] In this application, the retaining wall can be formed by pouring cement, the inner sidewall is smoothed with cement mortar, and a waterproof coating is applied to achieve the function of preventing water seepage. And the top of the retaining wall should be higher than the ground to prevent surface water that has not been treated by this ecological filter pond from directly draining into the lake.

[0022] In this application, the filtering matrix layer is composed of filter sand with a diameter of 0 - 2 mm and silica, among which the content of 0.25 - 0.5 mm must reach more than 50%, the mud content and organic matter content are less than 1%, and the permeability coefficient is greater than 1*10 -5 . The gravel layer 3 is composed of gravel, which not only plays a role in filtering, but also plays a role in supporting and fixing the collecting pipe 8 and the infiltration pipe 9.

[0023] Among them, both the collecting pipe and the air pipe are closed pipes, while the infiltration pipe is a slotted pipe, which is slit in the factory in advance, the slitting rate is greater than or equal to 2%, and the slit width is 0.1 - 1 mm, which should not be too large to prevent impurities from entering and blocking. Since the air pipe introduces the external atmosphere, an aerobic zone is formed between the infiltration pipe and the gravel layer, thereby accelerating the decomposition, oxidation and degradation of the organic matter in the infiltrated water.

[0024] Rainwater is filtered in turn through the filtering matrix layer 2 and the gravel layer 3 and infiltrates downward, and then enters the infiltration pipe through the slits on the infiltration pipe. Since the air pipe is connected to the external atmosphere, air pressure is formed, causing the water to enter the collecting pipe. When it accumulates to a certain amount, it is discharged into the drainage area 7. When the rainfall is too large, it will accumulate at the sediment layer 6 to form water pressure and infiltrate downward.

[0025] During the infiltration process of rainwater through the filtering matrix layer 2 and the gravel layer 3, purification is carried out through the cooperation of different mechanisms. On the one hand, the solid substances are blocked and separated by the filtering matrix layer 2 and the gravel layer 3. On the other hand, since the air pipe introduces the external atmosphere, an aerobic zone is formed between the infiltration pipe and the gravel layer, thereby accelerating the decomposition, oxidation and degradation of the organic matter in the infiltrated water, making the water quality purified.

[0026] In a further scheme, the ecological filter pond is inclined and arranged on the outside of the lake, and a drainage area 7 is provided between the ecological filter pond and the lake; a drainage port communicating with the drainage area 7 is opened on one side of the retaining wall 1, and the water outlet of the collecting pipe 8 is communicated with the drainage port.

[0027] The ecological filter pond is generally arranged in an inclined shape on the slope of the lake, its drainage port is arranged at the lower part of the slope and communicated with the drainage area 7, and a plurality of water inlet pipes are opened on the retaining wall 1 on the opposite side of the drainage port. The water inlet end of the water inlet pipe is on the ground and the water outlet end is in the sedimentation area 6. Thus, the rainwater on the slope can smoothly enter the ecological filter pond for purification treatment.

[0028] The bottom end surface of the drainage area 7 is paved with round gravel, the particle size of which is between 2-8 mm and the mud content is ≤1%, which increases the water permeability and prevents impurities or filter sand from being carried out and entering the lake.

[0029] The air pipe 10 is arranged upward along the retaining wall 1, and its top end is located above the sedimentation layer 6, so as to introduce the outside air. A circulation pump can also be connected to the water outlet of the water collecting pipe 8, which not only accelerates the discharge of the purified rainwater as soon as possible, but also accelerates the air from the air pipe 10 into the seepage pipe 9.

[0030] In a further embodiment, the waterproof layer 5 comprises a geotextile layer 1 51, a waterproof membrane layer 52 and a geotextile layer 2 53 which are laid in sequence from bottom to top. The three layers are bonded or welded to achieve a waterproof effect, so that the purified rainwater enters the water collection pipe along the seepage pipe.

[0031] In a further solution, the ecological filter tank is in the shape of a special-shaped structure, and both ends of the tank bottom are arranged to tilt upward to form a protection zone, and the outer ends of the protection zone are flush with the ground.

[0032] In a further solution, the upper surface of the protection zone is planted with turf, which protects the water and soil and prevents impurities from entering the ecological filter. The upper surface of the filter matrix layer 2 is planted with aquatic plants. Aquatic plants are planted on the filter matrix layer of the ecological filter, mainly reeds. Reeds are suitable for wetlands, have well-developed rhizomes, and strong aeration tissues, which are conducive to the decomposition and removal of pollutants in the water, and have a high removal rate for nitrogen and phosphorus. The plants need to be kept moist before planting and watered within 24 hours after planting. The root ball of the reed should be full and bare-rooted, without soil, to avoid contaminating the filter matrix layer or causing blockage.

[0033] Therefore, rainwater is first purified by aquatic plants, then purified again by filtering matrix layer 2 and gravel layer 3, and finally purified in the aerobic zone between the seepage pipe and the gravel layer, and finally enters the seepage pipe through the slit on the seepage pipe and enters the water collection pipe. When accumulated to a certain amount, it is discharged into the drainage area 7 and then into the lake, achieving the purpose of purifying and discharging rainwater.

[0034] The above-described embodiments of the present invention do not constitute a limitation on the protection scope of the present invention. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A rainwater ecological filter, comprising a pool wall and a pool bottom, characterized in that: The pool wall is a retaining wall (1) higher than the ground, the pool bottom is paved with a waterproof layer (5), a water pipe layer (4) is provided above the waterproof layer (5), and a gravel layer (3) and a filtration matrix layer (2) are provided above the water pipe layer (4) in sequence; a sedimentation layer (6) is formed between the filtration matrix layer (2) and the top surface of the retaining wall (1); a water collecting pipe (8) is horizontally laid along the waterproof layer (5) in the water pipe layer (4), a plurality of seepage pipes (9) are connected to the water collecting pipe (8), and the ends of the seepage pipes (9) are vertically connected to an air pipe (10).

2. A rainwater ecological filter according to claim 1, characterized in that: The ecological filter is arranged obliquely on the outside of the lake, and a drainage area (7) is provided between the ecological filter and the lake; a drainage outlet connected to the drainage area (7) is provided on one side of the retaining wall (1), and the water outlet of the water collecting pipe (8) is connected to the drainage outlet.

3. A rainwater ecological filter according to claim 1, characterized in that: The water outlet of the water collecting pipe (8) is connected to a circulation pump.

4. A rainwater ecological filter according to claim 1, characterized in that: The air pipes (10) are arranged upward along the retaining wall (1), and their top ends are located above the sedimentation layer (6).

5. A rainwater ecological filter according to claim 1, characterized in that: The waterproof layer (5) comprises a geotextile layer 1 (51), a waterproof membrane layer (52) and a geotextile layer 2 (53) which are laid in sequence from bottom to top.

6. A rainwater ecological filter according to claim 1, characterized in that: The two ends of the pool bottom are arranged to tilt upward to form a protection zone, and the outer ends of the protection zone are flush with the ground.

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