Water purification type ecological farmland

Abstract

The utility model relates to the technical field of water pollution treatment, in particular to a water purification type ecological farmland. Comprising a planting soil layer, a filler layer and a separation layer, and the planting soil layer is used for planting crops; the filler layer is located below the planting soil layer and used for purifying sewage flowing through the filler layer, and a water inlet and a water outlet are formed in the side portion of the filler layer; the separation layer is located between the planting soil layer and the filler layer and used for isolating water in the filler layer from permeating into the planting soil layer. According to the water purification type ecological farmland, the farmland space is completely utilized for purifying incoming water, the farmland property is not changed, the farmland use function is not affected, and the problem that a sewage treatment project lacks land can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of water pollution treatment, in particular to a water purification type ecological farmland. Background Art

[0002] Sewage land treatment technologies such as artificial wetlands and oxidation ponds are widely used in deep purification of sewage treatment plant tailwater and control of farmland non-point source pollution due to their good ecological properties, low operating costs and good treatment effects. However, traditional sewage land treatment technologies have the problem of large engineering footprint. In addition, due to the low temperature in winter, plants and microorganisms are greatly affected, and the treatment effect of sewage land treatment technologies in winter is generally relatively poor.

[0003] In order to solve the above technical problems, a Chinese invention patent with patent number "CN112062280A" and titled "A combined trapezoidal ecological ditch" discloses a technology applied to agricultural non-point source pollution treatment. The patent introduces a plurality of ditch units arranged in the ditch body, and the ditch unit is provided with a channel bottom filling layer and a filling layer from bottom to top in sequence. The channel bottom filling layer and the filling layer are arranged close to the inner wall of the ditch unit, and plant retention holes are arranged on the inner wall and outer slope of the ditch unit. The plant retention holes on the inner wall of the ditch unit are located above the filling layer. A drain port is also arranged on the outer slope of the ditch unit, and the drain port is located below the plant retention hole. The drain port is connected to the bottom of the filling layer through a drain pipe, and a water inlet is arranged on the front side of the filling layer, and a water outlet is arranged on the rear side. The filling layer in the ditch introduced in this patent and the filling layer at the bottom of the channel can achieve coordinated purification of the water surface and underwater. The filling planting soil layer can purify surface runoff and rainwater, while the part of the filling layer immersed below the water surface and the filling layer at the bottom of the channel can deeply purify the water in the ditch.

[0004] However, the application scope of the ditch structure introduced in the patent is relatively limited. First of all, this structure can only be applied to ditches and cannot be extended to farmland structures. Secondly, the upper and lower parts of this ditch structure are not separated and not completely isolated, that is, the sewage in the upper layer may enter the lower layer. Of course, what the patent requires is the coordinated purification of the upper and lower layers. This type of structure is definitely feasible for sewage purification alone, but if crops are planted on the upper layer, it is definitely not possible, because the crops planted on the upper layer may cause serious pollution to the crops after absorbing sewage. Therefore, the scope of application of this type of ditch structure is very limited. Although it can achieve the function of purifying sewage, it needs to change the nature of farmland and cannot be promoted and applied on farmland. Utility Model Content

[0005] The purpose of the utility model is to solve the deficiencies of the above-mentioned background technology and provide a water purification type ecological farmland.

[0006] The technical solution of the utility model is: a water purification type ecological farmland, including:

[0007] A planting soil layer, wherein the planting soil layer is used for planting crops;

[0008] A packing layer, the packing layer is located below the planting soil layer and is used to purify the sewage flowing through it, and a water inlet and a water outlet are arranged on the side of the packing layer;

[0009] The separation layer is located between the planting soil layer and the filler layer, and is used to prevent water in the filler layer from penetrating into the planting soil layer.

[0010] According to a water-purifying ecological farmland provided by the present application, the packing layer includes an upper packing layer, a middle packing layer and a lower packing layer from top to bottom; the upper packing layer, the middle packing layer and the lower packing layer are layered structures formed by crushed stones, and the crushed stones in adjacent packing layers have different particle sizes.

[0011] According to a water purification ecological farmland provided by the present application, the crushed stone particle sizes of the upper filling layer and the lower filling layer are equal, and the crushed stone particle size of the upper filling layer is larger than that of the middle filling layer.

[0012] According to a water purification ecological farmland provided by the present application, the water inlet is located on one side of the lower packing layer, and the water outlet is located on one side of the upper packing layer; the water inlet and the water outlet are disposed on opposite sides of the packing layer.

[0013] According to the water purification type ecological farmland provided in this application, it also includes:

[0014] The water filtration ditch is an open ditch arranged in the planting soil layer. The water filtration ditch is filled with fillers that can adsorb and filter the water flowing through it. The outlet end of the water filtration ditch is connected to the water inlet of the filler layer below.

[0015] According to a water purification ecological farmland provided by the present application, a plurality of water filtration ditches are arranged in the planting soil layer, and the plurality of water filtration ditches are arranged in a staggered manner in the longitudinal and transverse directions.

[0016] According to the water purification type ecological farmland provided in this application, it also includes:

[0017] The intermediate water pool is a pool body arranged on one side of the planting soil layer and the filler layer. An aerator is arranged in the intermediate water pool. An outlet connected to the water inlet is arranged at the bottom of the intermediate water pool. An inlet connected to the outlet end of the filtration ditch is arranged at the top of the intermediate water pool.

[0018] According to a water purification ecological farmland provided in the present application, an inlet end of a water filtration ditch is arranged on one side of the planting soil layer, and an outlet end of the water filtration ditch is arranged on the other side of the planting soil layer.

[0019] According to a water purification ecological farmland provided by the present application, the inlet end of the water filtration ditch and the outlet of the filler layer are located on the same side of the planting soil layer.

[0020] According to a water purification ecological farmland provided by the present application, an anti-seepage membrane is arranged at the bottom and around the packing layer.

[0021] The advantages of this application are as follows: 1. This application arranges a packing layer below the planting soil layer, and the packing layer has an independent water inlet and outlet, so as to form a sewage treatment unit. The sewage treated by the packing layer will not penetrate into the planting soil layer, and will not cause any pollution to the planting soil layer. At the same time, farmland can be effectively used to construct a sewage treatment structure without changing the nature of the cultivated land and affecting the use function of the cultivated land, which can effectively reduce the problem of lack of land for sewage treatment projects;

[0022] 2. The packing layer of the present application includes three layers, which are a layered structure formed by gravel filling, with a simple structure and low cost, and can effectively filter and adsorb the tail water or rainwater of the sewage treatment plant;

[0023] 3. In the three-layer packing layer of the present application, the crushed stone particle size of the upper packing layer and the lower packing layer is equal, and larger than the crushed stone particle size of the middle packing layer, the structure is simple, the layout is convenient, and the cost of the constructed packing layer is low;

[0024] 4. The water inlet and the water outlet of the packing layer of the present application are placed on opposite sides, which can ensure that the water flowing through the packing layer has a sufficiently long flow distance, so that the packing layer can perform adsorption and filtration treatment on the water flowing through to the greatest extent, thereby improving the treatment efficiency of the water flowing through;

[0025] 5. This application sets up a water filtration ditch in the planting soil layer. The water filtration ditch can effectively filter the incoming water and reduce the risk of blockage of the filler layer in the later stage. The water seeping from the water filtration ditch can be used to replenish water for crops and promote the growth of crops. In addition, the water filtration ditch can also collect farmland drainage on rainy days and introduce the drainage into the filler layer below for purification, effectively reducing farmland non-point source pollution;

[0026] 6. The present application sets up multiple water filtration ditches in the planting soil layer. The multiple water filtration ditches are arranged in a staggered manner and can be evenly distributed in the planting soil layer to filter the incoming water to the greatest extent and provide water sources for the planting soil layer evenly;

[0027] 7. The present application sets an intermediate water pool between the water filtration ditch and the filler layer. The intermediate water pool can perform simple aeration treatment on the water flowing out of the water filtration ditch to achieve a certain purification effect, fully oxygenate the incoming water, effectively reduce the problem of reduced purification capacity caused by lack of oxygen in the filler layer, and ensure the removal rate of pollutants. In addition, the intermediate water pool also has the function of a water storage tank, and can be used as a water source for irrigation of surrounding farmland when necessary;

[0028] 8. The inlet and outlet of the water filter ditch are respectively arranged on the opposite sides of the planting soil layer, so that the water flowing through the water filter ditch has a sufficient flow distance, which can increase the adsorption treatment effect of the water filter ditch on the one hand, and facilitate water supply to the planting soil layer on the other hand;

[0029] 9. The inlet end of the water filter ditch of the present application is on the same side as the outlet of the filler layer, which is equivalent to forming a baffle structure between the water filter ditch and the filler layer, which can ensure that the water has sufficient flow distance to the greatest extent in a limited space and enhance the treatment effect;

[0030] 10. This application sets an anti-seepage membrane at the bottom of the filler layer to prevent water in the filler layer from penetrating into the soil below and causing pollution to the surrounding soil.

[0031] The water-purifying ecological farmland of the present application fully utilizes the farmland space to purify the incoming water, does not change the nature of the cultivated land, does not affect the use function of the cultivated land, and can effectively reduce the problem of lack of land for sewage treatment projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 : A top view of the water purification ecological farmland of the present application;

[0033] Figure 2 : A cross-sectional view of the water purification ecological farmland of the present application;

[0034] 1—planting soil layer; 2—crops; 3—filtration ditch; 4—separation layer; 5—upper filling layer; 6—middle filling layer; 7—lower filling layer; 8—anti-seepage membrane; 9—intermediate water pool; 10—inlet; 11—outlet; 12—aerator; 13—outlet pipe. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0036] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] The utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] This application involves a water purification ecological farmland, which is a transformation of the original farmland. A sewage treatment facility is constructed below the original farmland, which can effectively treat water bodies with less serious pollution, such as sewage plant tailwater or rainwater. The water treatment facility is located below the original farmland, and will not cause any impact or interference to the original farmland, nor will it pollute the original farmland. At the same time, it can form an effective sewage treatment facility, without changing the nature of the farmland, and without affecting the use function of the farmland, which can effectively reduce the problem of lack of land for sewage treatment projects.

[0040] Specifically, Figures 1-2 As shown, a water-purifying ecological farmland of the present application includes a planting soil layer 1, a filling layer and a separation layer 4. The planting soil layer 1 is used for planting crops 2, and the planting soil layer 1 is the soil layer of the original farmland; the filling layer is located below the planting soil layer 1 and is used to purify the sewage flowing through. The side of the filling layer is provided with a water inlet and a water outlet. The water to be treated enters the filling layer through the water inlet. After adsorption and filtration treatment by the filling layer, the purified water flows out through the water outlet. The entire purification process is carried out in the filling layer, that is, below the planting soil layer 1, and will not affect the growth of crops on the planting soil layer 1; the separation layer 4 is located between the planting soil layer 1 and the filling layer, and is used to isolate the water in the filling layer from penetrating into the planting soil layer 1, so as to prevent the sewage flowing through the filling layer from polluting the planting soil layer 1.

[0041] In actual application, the packing layer, the separation layer 4 and the planting soil layer 1 are constructed from bottom to top. There are a water inlet and a water outlet on the packing layer. The water to be treated enters the packing layer through the water inlet, and the filler in the packing layer filters, adsorbs and purifies the water. The purified water is discharged through the water outlet on the packing layer. The water in the packing layer only flows in the packing layer, and under the isolation effect of the separation layer 4, it will not penetrate into the planting soil layer 1, and will not cause pollution to the planting soil layer 1. Crops 2 can be planted on the planting soil layer 1.

[0042] The filler layer of the present application is completely below the planting soil layer 1, has good thermal insulation performance, has little seasonal impact on the processing capacity, and has stable effluent water quality.

[0043] In some embodiments of the present application, the above-mentioned packing layer is optimized, specifically, Figure 2 As shown, the packing layer includes an upper packing layer 5, a middle packing layer 6 and a lower packing layer 7 from top to bottom. The upper packing layer 5, the middle packing layer 6 and the lower packing layer 7 are layered structures formed by crushed stones, and the crushed stones in adjacent packing layers have different particle sizes.

[0044] The upper packing layer 5 and the lower packing layer 7 have the same crushed stone particle size, and the crushed stone particle size of the upper packing layer 5 is larger than that of the middle packing layer 6. The upper packing layer 5 is a crushed stone filler with a particle size of 40 to 60 mm and a thickness of 0.2 to 0.3 m; the middle packing layer 6 is a crushed stone filler with a particle size of 15 to 30 mm and a thickness of 0.6 to 0.8 m; and the lower packing layer 7 is a crushed stone filler with a particle size of 40 to 60 mm and a thickness of 0.2 to 0.3 m.

[0045] For the arrangement of water inlet and outlet on the packing layer, Figure 2 As shown, the water inlet of this embodiment is located on one side of the lower packing layer 7, and the water outlet is located on one side of the upper packing layer 5, and the water inlet and the water outlet are respectively placed on opposite sides of the packing layer. Such an arrangement allows the water to be treated to enter the packing layer from the lower packing layer 7 at the bottom of one side of the packing layer, and the water passes through the lower packing layer 7, the middle packing layer 6 and the upper packing layer 5 in sequence, and flows out of the packing layer from the other side of the upper packing layer 5. The flow distance of the water is extended to the greatest extent, ensuring the treatment effect of the packing layer on the adsorption and filtration of the water.

[0046] In this embodiment, a water outlet pipe 13 is provided at the water outlet of the packing layer. Figure 1 As shown, easy drainage.

[0047] In order to avoid contamination of the soil below, an impermeable membrane 8 is provided at the bottom and around the packing layer. In fact, the packing layer is between the separation layer 4 and the impermeable membrane 8, that is, the packing layer is completely isolated from the surrounding soil and the planting soil layer 1, and the treated water will not penetrate into the surrounding soil and cause pollution to the surrounding soil.

[0048] The anti-seepage membrane 8 of this embodiment is a HDPE anti-seepage membrane, which is laid around the upper filling layer 5, the middle filling layer 6, the lower filling layer 7 and the bottom of the lower filling layer 7 to completely separate the filling layer from the surrounding soil; the separation layer 4 adopts two cloths and one membrane, and is arranged between the planting layer and the upper filling layer 5 to completely separate the two.

[0049] During actual construction, an impermeable membrane 8 is laid around and at the bottom of the filling layer, and filling layers are filled in the space constructed by the impermeable membrane 8, namely a lower filling layer 7, a middle filling layer 6 and an upper filling layer 5. A water inlet is arranged on one side of the lower filling layer 7, and a water outlet is arranged on the opposite side of the upper filling layer 5, and a water outlet pipe 13 is installed on the water outlet; a partition layer 4 is arranged on the top of the upper filling layer 5, and a planting soil layer 1 is filled on the partition layer 4, and crops 2 are planted on the planting soil layer 1.

[0050] In a further embodiment of the present application, the present embodiment further comprises a water filtering ditch 3, such as Figure 1 As shown, the water filtration ditch 3 is an open ditch arranged in the planting soil layer 1. The water filtration ditch 3 is filled with fillers that can adsorb and filter the water flowing through it. The outlet end of the water filtration ditch 3 is connected to the water inlet of the filler layer below.

[0051] The filler arranged in the water filtration ditch 3 of this embodiment is actually gravel, that is, in this embodiment, a ditch is excavated on the planting soil layer 1, and then gravel is filled in the ditch to form the required water filtration ditch 3. Water can enter the water filtration ditch 3, and the water entering the water filtration ditch 3 is purified under the adsorption and filtration effect of the filler. A part of the purified water directly enters the planting soil layer 1 to replenish water for the crops 2, and the other part of the water enters the filler layer below through the outlet end for secondary treatment.

[0052] The water filter ditch 3 performs preliminary filtration and adsorption treatment on the water to be treated, which greatly reduces the particulate matter in the water entering the packing layer, reduces the risk of clogging the packing layer in the later stage, and the water seeping out of the water filter ditch 3 can be used to replenish water for crops and promote crop growth. In addition, the water filter ditch 3 can also collect farmland drainage on rainy days and introduce the drainage into the packing layer below for purification, effectively reducing farmland non-point source pollution.

[0053] like Figure 1 As shown, in this embodiment, a plurality of drainage ditches 3 are arranged in the planting soil layer 1, and the plurality of drainage ditches 3 are arranged in a staggered manner in the longitudinal direction and the transverse direction, so as to ensure that each position of the planting soil layer 1 can evenly obtain the water infiltrated from the drainage ditches 3.

[0054] This embodiment also optimizes the inlet and outlet of the water filtration ditch 3. Figure 1 As shown, the inlet end of the water filter ditch 3 is arranged on one side of the planting soil layer 1, and the outlet end of the water filter ditch 3 is arranged on the other side of the planting soil layer 1. At the same time, the inlet end of the water filter ditch 3 and the outlet of the filler layer are on the same side of the planting soil layer 1. This arrangement enables the water filter ditch 3 to form a baffle structure with the filler layer below, and the distance that the water flows in the water filter ditch 3 and the filler layer is greatly improved, making the maximum use of the limited space of the planting soil layer 1.

[0055] When in use, rainwater or slightly polluted water enters the filter ditch 3 from the inlet end thereof, and under the action of the filler inside the filter ditch 3, the water flowing through the filter ditch 3 is subjected to adsorption and filtration treatment, and part of the water enters the surrounding seed soil layer 1 through infiltration, and the other part of the water flows out through the outlet end of the filter ditch 3, and the outflowing water enters the lower filler layer 7 through the water inlet of the filler layer, and is subjected to secondary adsorption and filtration treatment through the lower filler layer 7, the middle filler layer 6 and the upper filler layer 5 in turn, and the treated water is discharged through the outlet pipe 13 on the upper filler layer 5.

[0056] In some other embodiments of the present application, this embodiment further includes an intermediate water pool 9, such as Figures 1-2 As shown, the middle water pool 9 is a pool body arranged on one side of the planting soil layer 1 and the filler layer. The middle water pool 9 is a reinforced concrete pool with an area of ​​not less than 15m 2 The top is open, and 1 to 2 aerators 12 are arranged in the middle water tank 9 (the aerator 12 is a water-lifting aerator with an oxygenation capacity of not less than 2.5 kgO2 / h). An outlet 11 connected to the water inlet is arranged at the bottom of the side wall of the middle water tank 9, and an inlet 10 connected to the outlet end of the filtration ditch 3 is arranged at the top of the side wall of the middle water tank 9.

[0057] The intermediate water pool 9 connects the water filtration ditch 3 and the packing layer, and can also serve as an independent water supply unit for the packing layer. After the water treated by the water filtration ditch 3 enters the intermediate water pool 9, it can be oxygenated in the intermediate water pool 9, which can fully oxygenate the incoming water, effectively reduce the problem of reduced purification capacity caused by lack of oxygen in the packing layer, and ensure the pollutant removal rate. At the same time, the intermediate water pool 9 is set on one side of the planting soil layer 1, and the intermediate water pool 9 also has the function of a water storage tank, which can be used as a water source for irrigation of surrounding farmland when necessary.

[0058] In actual application, the water to be treated first enters the water filtration ditch 3, and the water flows in the water filtration ditch 3. Part of the water is directly filtered by the gravel in the water filtration ditch 3 and enters the surrounding seed soil layer 1 to replenish water for the crops 2. The other part of the water enters the intermediate water tank 9 through the water filtration ditch 3. The aerator 12 in the intermediate water tank 9 is operated to oxygenate the water entering the intermediate water tank 9. The oxygenated water enters the lower packing layer 7, and passes through the lower packing layer 7, the middle packing layer 6 and the upper packing layer 5 in turn for secondary adsorption and filtration treatment. The treated water is discharged through the outlet pipe 13 on the upper packing layer 5.

[0059] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A water purification ecological farmland, characterized by: include, A planting soil layer (1), wherein the planting soil layer (1) is used for planting crops (2); A packing layer, the packing layer being located below the planting soil layer (1) and used for purifying sewage flowing therethrough, and a water inlet and a water outlet being arranged on a side of the packing layer; A separation layer (4), the separation layer (4) being located between the planting soil layer (1) and the filler layer, and being used to prevent water in the filler layer from penetrating into the planting soil layer (1); The packing layer comprises, from top to bottom, an upper packing layer (5), a middle packing layer (6) and a lower packing layer (7); the upper packing layer (5), the middle packing layer (6) and the lower packing layer (7) are layered structures formed by crushed stones, and the crushed stones in adjacent packing layers have different particle sizes.

2. A water purification ecological farmland as claimed in claim 1, characterized in that: The crushed stone particle sizes of the upper filling layer (5) and the lower filling layer (7) are equal, and the crushed stone particle size of the upper filling layer (5) is larger than the crushed stone particle size of the middle filling layer (6).

3. A water purification ecological farmland as claimed in claim 1 or 2, characterized in that: The water inlet is located on one side of the lower packing layer (7), and the water outlet is located on one side of the upper packing layer (5); the water inlet and the water outlet are located on two opposite sides of the packing layer.

4. The water purification ecological farmland according to claim 1, characterized in that: Also includes, A water filtration ditch (3) is an open ditch arranged in the planting soil layer (1), the water filtration ditch (3) is filled with fillers that can absorb and filter the water flowing through, and the outlet end of the water filtration ditch (3) is connected to the water inlet of the filler layer below.

5. A water purification ecological farmland as claimed in claim 4, characterized in that: A plurality of water filtering ditches (3) are arranged in the planting soil layer (1), and the plurality of water filtering ditches (3) are arranged in a staggered manner in the longitudinal direction and the transverse direction.

6. A water purification ecological farmland as claimed in claim 4 or 5, characterized in that: Also includes, An intermediate water pool (9) is a pool body arranged on one side of the planting soil layer (1) and the filler layer, an aerator (12) is arranged in the intermediate water pool (9), an outlet (11) connected to the water inlet is arranged at the bottom of the intermediate water pool (9), and an inlet (10) connected to the outlet end of the water filtration ditch (3) is arranged at the top of the intermediate water pool (9).

7. A water purification ecological farmland as claimed in claim 4 or 5, characterized in that: An inlet end of a water filtration ditch (3) is arranged on one side of the planting soil layer (1), and an outlet end of the water filtration ditch (3) is arranged on the other side of the planting soil layer (1).

8. The water purification ecological farmland according to claim 7, characterized in that: The inlet end of the water filtration ditch (3) and the outlet of the filler layer are located on the same side of the planting soil layer (1).

9. The water purification ecological farmland according to claim 1, characterized in that: An impermeable membrane (8) is provided at the bottom and around the packing layer.

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