Sewage treatment and irrigation device

Abstract

A sewage treatment and irrigation device comprises a sewage treatment module, a power module, a control module and a solar photovoltaic panel assembly. The sewage treatment module comprises a sewage treatment tank, and the sewage treatment tank is sequentially provided with a water distribution area, a filter material area and a water collection area from top to bottom; the power module comprises a circulating water pump, a water outlet pipe of the circulating water pump is divided into an irrigation water outlet pipe and a circulating return pipe through a tee joint, and the circulating return pipe is communicated with the water distribution pipe of the water distribution area; an incoming water inlet pipe of the water collecting area is connected with a water outlet pipe of a peasant household septic tank, and water in the sewage treatment tank is continuously and circularly filtered under the action of a circulating water pump; a water body in the sewage treatment tank is continuously and circularly filtered among the water distribution area, the water outlet circulating well, the filter material area and the water collection area under the action of the circulating water pump, so that impurities in the water body are removed; in addition, surrounding vegetable fields and forest lands can be irrigated by opening the irrigation valve and closing the reflux valve, so that pollution to the environment is reduced, nitrogen and phosphorus nutrient elements in sewage are fully utilized, and resource utilization is realized.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and particularly relates to a wastewater treatment and irrigation device. Background Technology

[0002] Similar to regular domestic sewage, village domestic sewage also includes toilet wastewater, kitchen wastewater, washing wastewater, and bathing wastewater. Domestic sewage contains a large amount of organic matter, bacteria, and pathogens. If discharged directly without treatment, it will cause significant environmental pollution. As people's living standards continue to improve and rural lifestyles change, the amount of rural domestic sewage generated is also increasing. Environmental awareness is gradually rising, and people's requirements for domestic sewage treatment are also getting higher and higher. Simply using septic tanks to collect rural domestic sewage is no longer enough to meet the needs of villagers for rural environmental management and beautiful villages. Therefore, for farmers who cannot collect and treat domestic sewage in a centralized manner, there is a need for single-household sewage treatment devices suitable for their installation and use.

[0003] At present, many rural areas are still in the stage of natural sewage disposal, with a large amount of sewage and polluting waste being directly discharged into the environment, causing the continuous deterioration of the rural environment. At the same time, due to the scattered nature of rural pollution discharge, it is difficult for management departments to monitor it in a timely and accurate manner. In addition, a large number of young and middle-aged people have migrated to rural areas, and the cost of unified collection and management of rural sewage far exceeds the financial capacity of most local governments. It is also difficult to make farmers bear the cost of sewage treatment themselves. Most farmers need household sewage treatment devices that are easy to install, operate and maintain, have low operating costs, and have relatively stable operating effects, with effluent that is basically neither black nor smelly and can be used to irrigate their own vegetable gardens. Summary of the Invention

[0004] This application provides a sewage treatment and irrigation device. The water in the sewage treatment tank is continuously circulated and filtered between the water distribution area, the outlet circulation well, the filter media area, and the water collection area under the action of the circulating water pump. Impurities in the water are removed through continuous circulation and filtration. In addition, the surrounding vegetable gardens and woodlands can be irrigated by opening the irrigation valve and closing the return valve, which reduces environmental pollution and makes full use of the nitrogen and phosphorus nutrients in the sewage, thus realizing resource utilization.

[0005] Other objects and advantages of the present invention can be further understood from the technical features disclosed herein.

[0006] To achieve one or more of the above objectives or other objectives, the present invention provides a wastewater treatment and irrigation device.

[0007] A wastewater treatment and irrigation device includes: a wastewater treatment module, a power module, a control module, and a solar photovoltaic panel assembly; The wastewater treatment module includes a wastewater treatment tank, which consists of a water distribution area, a filter media area, and a water collection area from top to bottom. The water distribution area includes a water distribution pipe and a water distribution reflector plate assembly. The filter media area includes a planting soil layer, a gravel layer, and a support plate. The water collection area includes an inlet water pipe, a first compartment, a second compartment, a third compartment, an inner partition, and a gravity-flow outlet water pipe. The power module includes a circulating water pump. The outlet pipe of the circulating water pump is divided into an irrigation outlet pipe and a circulation return pipe via a tee. The circulation return pipe is connected to the water distribution pipe of the water distribution area. The inlet pipe of the water collection area is connected to the outlet pipe of the farmer's septic tank. The water in the sewage treatment tank is continuously circulated and filtered between the water distribution area, the filter media area, and the water collection area under the action of the circulating water pump. An irrigation valve is installed on the irrigation outlet pipe, and the irrigation of the water in the three compartments is achieved by opening and closing the irrigation valve.

[0008] The water distribution pipe includes a main water distribution pipe, branch water distribution pipes, and riser water distribution pipes; The main water distribution pipe is connected to three branch water distribution pipes, and the spacing between the branch water distribution pipes is the same. The water distribution branch pipe is horizontally and vertically connected to the water distribution main pipe; the water distribution riser is vertically connected to the water distribution branch pipe.

[0009] The water distribution reflector plate assembly includes a reflector plate and a reflector plate support; The reflector plate bracket is welded to the reflector plate to support the reflector plate; The reflector plate bracket is fixedly installed on the water distribution riser; The reflective arc plate assembly corresponds one-to-one with the water distribution riser; The water distribution riser is provided with a return outlet, which is perpendicular to the geometric center of the reflective arc plate.

[0010] The thickness of the planting soil layer is 150-200 mm; The gravel layer is located below the planting soil layer. The gravel layer has a thickness of 400-500 mm and a gravel particle size of 20-50 mm. The gravel particle size increases from top to bottom, with the bottom layer having the largest gravel particle size. The support plate is located below the gravel layer. The support plate is a fiberglass grating with a aperture of 25mm and is embedded and fixed to the inner wall of the sewage treatment tank.

[0011] The septic tank outlet pipe of the farmer is connected to the water inlet pipe of the water collection area. The water collection area is divided into three compartments by two inner partitions, namely compartment one, compartment two and compartment three. A U-shaped water pipe is installed in the lower middle part of the inner partition, and the three compartments of the water collection area are connected in series through the U-shaped water pipe; The inlet water pipe and the gravity outlet water pipe are located on the same horizontal plane; the lower end of the outlet water pipe is the highest liquid level of the water collection area, and there is a void layer between the highest liquid level of the water collection area and the support plate.

[0012] The wastewater treatment tank also includes an overflow bypass pipe, which is vertically installed on one side of the wastewater treatment tank. One end of the overflow bypass pipe is located in the water distribution area, and its horizontal height is higher than the planting soil layer of the filter media area. The other end of the overflow bypass pipe is located in the void layer above the first compartment.

[0013] The power module includes: Connecting pipe, irrigation outlet pipe, irrigation valve, circulation return pipe, return valve, outlet circulation well, submersible circulating water pump and lifting chain; One end of the connecting pipe is connected to the compartment three, and the other end is connected to the water circulation well; The outlet circulation well is a plastic pipe with a sealed bottom. The submersible circulating water pump is installed at the bottom of the outlet circulation well. The submersible circulating water pump is a DC motor water pump with an operating voltage between 12-60V. The highest liquid level in the water circulation well is kept at the same level as the liquid level in the water collection area. The lifting chain is connected to the submersible circulating water pump and is used to lift the submersible circulating water pump; The outlet pipe of the submersible circulating water pump is divided into an irrigation outlet pipe and a circulating return pipe via a tee. A return valve is installed on the circulating return pipe, and an irrigation valve is installed on the irrigation outlet pipe. The circulating return pipe is connected to the main water distribution pipe of the water distribution area.

[0014] The power module includes: Self-priming water outlet pipe, irrigation water outlet pipe, irrigation valve, circulating return pipe, return valve, self-priming circulating water pump; One end of the self-priming water outlet pipe is connected to the partition three-way connector, and the other end is connected to the self-priming circulating water pump; the installation height of the self-priming water outlet pipe is higher than that of the gravity-flow water outlet pipe of the water collection area; The self-priming circulating water pump is installed on the ground. The self-priming circulating water pump is a DC motor water pump with an operating voltage between 12-60V. The outlet pipe of the self-priming circulating water pump is divided into an irrigation outlet pipe and a circulating return pipe via a tee. A return valve is installed on the circulating return pipe, and an irrigation valve is installed on the irrigation outlet pipe. The circulating return pipe is connected to the main water distribution pipe of the water distribution area.

[0015] The control module includes a wall-mounted control cabinet; the wall-mounted control cabinet is installed above one side of the outer wall of the sewage treatment tank; The wall-mounted control cabinet is equipped with a circuit breaker, an intermediate relay, and an overcurrent protector. The wall-mounted control cabinet uses a dual power supply system, with one power source from the solar photovoltaic panel and the other from household electricity.

[0016] The solar photovoltaic panel assembly includes a solar photovoltaic panel, a solar photovoltaic panel support, and a counterweight base, with the counterweight base placed directly on the ground.

[0017] Compared with the prior art, the beneficial effects of the present invention mainly include: The water in the wastewater treatment tank of this application is continuously circulated and filtered between the water distribution area, the effluent circulation well, the filter media area, and the water collection area under the action of the circulating water pump. Impurities in the water are removed through continuous circulation and filtration. In addition, the surrounding vegetable gardens and woodlands can be irrigated by opening the irrigation valve and closing the return valve, which reduces environmental pollution and makes full use of the nitrogen and phosphorus nutrients in the wastewater, thus realizing resource utilization.

[0018] To make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a sewage treatment and irrigation device provided in Embodiment 1 of this application.

[0021] Figure 2 This is a schematic diagram of the water distribution pipe structure provided in Embodiment 1 of this application.

[0022] Figure 3 This is a schematic diagram of the water distribution reflector plate assembly provided in Embodiment 1 of this application.

[0023] Figure 4 This is a schematic diagram of a sewage treatment and irrigation device provided in Embodiment 2 of this application.

[0024] Figure 5 This is a schematic diagram of the structure of a solar photovoltaic panel module provided in Embodiment 1 of this application. Detailed Implementation

[0025] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are merely for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the present invention.

[0026] The embodiments of this application will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this application to facilitate a better understanding of the application. However, the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0027] Example 1 like Figure 1 As shown, a wastewater treatment and irrigation device includes: a wastewater treatment module, a power module, a control module, and a solar photovoltaic panel assembly; The wastewater treatment module includes a wastewater treatment tank 1, which, from top to bottom, comprises a water distribution area 11, a filter media area 12, and a water collection area 13. The water distribution area 11 includes water distribution pipes and a water distribution reflector plate assembly. The water distribution pipes include a main water distribution pipe 111, branch water distribution pipes 112, and a riser water distribution pipe 113. Three branch water distribution pipes 112 are connected to the main water distribution pipe 111, with equal spacing between them. The branch water distribution pipes 112 are horizontally and vertically connected to the main water distribution pipe 111. The riser water distribution pipe 113 is vertically connected to the branch water distribution pipes 112. Figure 2 As shown; As a preferred embodiment of the present invention, the sewage treatment tank 1 in this embodiment can be made of fiberglass or PP material, and can be installed in a semi-buried or fully buried manner, directly connected to the outlet of the septic tank of the farmer's house.

[0028] like Figure 3 As shown, the water distribution reflector plate assembly includes a reflector plate 101 and a reflector plate bracket 102; the reflector plate bracket 102 is welded to the reflector plate 101 and supports the reflector plate 101; the reflector plate bracket 102 is fixedly installed on the water distribution riser 113; the reflector plate assembly corresponds one-to-one with the water distribution riser 113; the water distribution riser 113 is provided with a return outlet 1130, which is perpendicular to the geometric center of the reflector plate 101.

[0029] In a preferred embodiment of the present invention, the reflective arc plate 101 is a stainless steel disc with an inner curvature of 35 degrees; the reflective arc plate bracket 102 is a stainless steel bracket that supports the reflective arc plate 101 to keep it fixed.

[0030] like Figure 1 As shown, the filter media zone 12 includes a planting soil layer 121, a gravel layer 122, and a support plate 123. The planting soil layer 121 is 150-200mm thick and is filled with several nylon mesh bags. The nylon mesh bags filled with planting soil are arranged horizontally in sequence, and the planting soil in the nylon mesh bags is easy to replace later. The gravel layer 122 is located below the planting soil layer 121. The gravel layer 122 is 400-500mm thick and the gravel particle size of the gravel layer 122 is 20-50mm. The particle size of the gravel increases from top to bottom, and the gravel particle size of the bottom layer is the largest. The support plate 123 is located below the gravel layer 122. The support plate 123 is a fiberglass grating with a pore size of 25mm and is embedded and fixed on the inner wall of the sewage treatment tank 1.

[0031] like Figure 1 As shown, the water collection area 13 includes an inlet water pipe 130, a first compartment 131, a second compartment 132, a third compartment 133, an inner partition 134, and a gravity-flow outlet water pipe 135. The outlet water pipe of the farmer's septic tank is connected to the inlet water pipe 130 of the water collection area 13. The water collection area 13 is divided into three compartments by two inner partitions 134, namely, compartment one 131, compartment two 132, and compartment three 133. A U-shaped water pipe 136 is installed in the lower middle part of the inner partition 134, and the three compartments of the water collection area 13 are connected in series by the U-shaped water pipe 136. The inlet water pipe 130 and the gravity-flow outlet water pipe 135 are located on the same horizontal plane. The lower end of the outlet water pipe 135 is the highest liquid level of the water collection area 13, and there is a gap layer between the highest liquid level of the water collection area 13 and the support plate 123.

[0032] like Figure 1 As shown, the sewage treatment tank 1 also includes an overflow bypass pipe 14, which is vertically installed on one side of the sewage treatment tank 1. One end of the overflow bypass pipe 14 is located in the water distribution area 11, and its horizontal height is higher than the planting soil layer 121 of the filter media area 12. The other end of the overflow bypass pipe 14 is located in the void layer above the compartment 131.

[0033] like Figure 1 As shown, the power module includes: a connecting pipe 20, an irrigation outlet pipe 21, an irrigation valve 211, a circulation return pipe 22, a return valve 221, an outlet circulation well 23, a submersible circulation pump 24, and a lifting chain 25; one end of the connecting pipe 20 is connected to compartment 3 133, and the other end is connected to the outlet circulation well 23; the outlet circulation well 23 is a plastic pipe with a sealed bottom, installed semi-buried or fully buried on the ground, and the submersible circulation pump 24 is installed at the bottom of the outlet circulation well 23; the submersible circulation pump 24 is a DC motor pump with an operating voltage between 12-60V; the highest liquid level in the outlet circulation well 23 is kept at the same level as the liquid level in the collection area 13; the lifting chain 25 is connected to the submersible circulation pump 24 and is used to lift the submersible circulation pump 24; The outlet pipe of the submersible circulating water pump 24 is divided into an irrigation outlet pipe 21 and a circulating return pipe 22 via a tee. A return valve 221 is installed on the circulating return pipe 22, and an irrigation valve 211 is installed on the irrigation outlet pipe 21. The circulating return pipe 22 is connected to the main water distribution pipe 111 of the water distribution area 11.

[0034] like Figure 1 As shown, the control module includes a wall-mounted control cabinet 41; the wall-mounted control cabinet 41 is installed on the upper side of one side of the outer wall of the sewage treatment tank 1 and is made of SUS304 stainless steel; the wall-mounted control cabinet 41 is equipped with components such as circuit breakers, intermediate relays and overcurrent protectors to control the start and stop of the circulating water pump; the wall-mounted control cabinet 41 adopts dual power supply control, one power source is from the solar photovoltaic panel module, and the other power source is from the household electricity of farmers.

[0035] like Figure 5 As shown, the solar photovoltaic panel module includes a solar photovoltaic panel 51, a solar photovoltaic panel support 52, and a counterweight base 53. The counterweight base 53 is placed directly on the ground, and the solar photovoltaic panel module can be moved by moving the support base 52.

[0036] The wastewater treatment tank 1 of this application has a simple structure, uses common materials, and has a long service life. It can be installed in a semi-buried or fully buried manner. It is easy to install and occupies a small area. It can be directly connected to the septic tank outlet pipe of the farmer, with gravity-flow water inlet and gravity-flow water outlet.

[0037] Specifically, sewage from the septic tank outlet pipe enters compartment 131. Under the action of gravity, it flows sequentially through the U-shaped water pipes 136 on the two inner partitions 134, from compartment 131 to compartments 132 and 133, and then through the connecting pipe 20 into the outlet circulation well 23. When the submersible circulating water pump 24 is running, it draws water from the outlet circulation well 23, which then flows sequentially through the circulation return pipe 22 into the main water distribution pipe 111, the branch water distribution pipe 112, and the riser water distribution pipe 113. The water is sprayed through the riser water distribution pipe 113 onto the concave surface of the reflector plate 101 and evenly dispersed in the planting soil layer 121 of the water distribution area 11. After being filtered by the planting soil layer 121, the water flows by gravity into the filter media area 12. After being further filtered by the gravel layer 122 of the filter media area 12, it enters the water collection area 13 and flows evenly into the three compartments of the water collection area 13. When the planting soil layer 121 in the water distribution area 11 becomes blocked, affecting the free infiltration of water, the accumulated liquid in the planting soil layer 121 can flow directly into the compartment 131 of the water collection area 13 through the overflow bypass pipe 14, thus preventing water from overflowing the sewage treatment tank. For the blocked planting soil layer 121, farmers can remove the planting soil in the nylon mesh bag and replace it with new planting soil. When there is a large amount of scum and bottom mud in the compartment 131 of the water collection area 13, the mud and scum in the compartment 131 can be cleaned out through the overflow bypass pipe 14.

[0038] When the water level in compartment 3 133 of the water collection area 13 is higher than the gravity outflow pipe 135, the liquid in the sewage treatment tank 1 flows into the surrounding water body through the gravity outflow pipe 135. When the DC water pump is directly driven by the solar photovoltaic panel 51, the current generated by the solar photovoltaic panel 51 can directly drive the submersible circulating water pump to run continuously when the sunlight is good, and no energy consumption is generated during the operation. When there are continuous cloudy and rainy days, the output voltage and current of the solar photovoltaic panel 51 are unstable, and the household power supply mode can be switched.

[0039] This application uses a DC motor water pump with dual power supply. In daily use, the solar photovoltaic panel 51 is directly connected to the water pump through control components to continuously circulate and filter the water in the collection area 13, which greatly increases the total residence time of sewage in the sewage treatment tank 1. After multiple cycles of treatment, the effluent can be stably kept clean and odorless, and the overall operating energy consumption is low.

[0040] Farmers can switch irrigation valve 211 and return valve 221 as needed to irrigate surrounding vegetable fields and woodlands with water pumps, reducing environmental pollution and making full use of nitrogen and phosphorus nutrients in wastewater to achieve resource utilization.

[0041] The solar photovoltaic panel components of this application can be installed and fixed according to the terrain of the farmer's home, and can be moved and adjusted. The water body is continuously circulated in the sewage treatment tank 1 by an external water pump, and impurities in the water are continuously intercepted and removed. When irrigation is needed, the surrounding vegetable gardens and woodlands can be irrigated by switching the valve of the water pump outlet. The operation is simple and can be operated by the farmer himself. The planting soil layer 121 of the sewage treatment tank 1 can be used to plant some water-loving vegetables. The planting soil in the nylon mesh bag can be replaced regularly, which is suitable for single-household farmers.

[0042] Example 2 like Figure 4 As shown, the power module includes: a self-priming water outlet pipe 30, an irrigation water outlet pipe 21, an irrigation valve 211, a circulation return pipe 22, a return valve 221, and a self-priming circulating water pump 31; One end of the self-priming outlet pipe 30 is connected to compartment 3 133, and the other end is connected to the self-priming circulating water pump 31; the installation height of the self-priming outlet pipe 30 is higher than the self-flowing outlet pipe 135 of the water collection area 13; the self-priming circulating water pump 31 is installed on the ground, and the self-priming circulating water pump 31 is a DC motor water pump with a working voltage between 12-60V. The outlet pipe of the self-priming circulating water pump 31 is divided into an irrigation outlet pipe 21 and a circulating return pipe 22 via a tee. A return valve 221 is installed on the circulating return pipe 22, and an irrigation valve 211 is installed on the irrigation outlet pipe 21. The circulating return pipe 22 is connected to the main water distribution pipe 111 of the water distribution area 11.

[0043] Specifically, the sewage from the septic tank outlet pipe enters compartment 131 and, under the action of gravity flow, flows sequentially through the U-shaped water pipes 136 on the two inner partitions 134, from compartment 131 to compartment 2 132 and compartment 3 133. When the self-priming circulating water pump 31 is started, the self-priming circulating water pump 31 draws liquid from the three compartments 133, and the liquid enters the main water distribution pipe 111, the branch water distribution pipe 112 and the water distribution riser pipe 113 in sequence through the circulating return pipe 22. The water is sprayed onto the concave surface of the reflective arc plate 101 through the water distribution riser pipe 113 and is evenly distributed in the planting soil layer 121 of the water distribution area 11. The water filtered by the planting soil layer 121 flows into the filter media area 12 by gravity, and after being filtered again by the gravel layer 122 of the filter media area 12, it enters the water collection area 13 and flows evenly into the three compartments of the water collection area 13. When the planting soil layer 121 in the water distribution area 11 becomes blocked, affecting the free infiltration of water, the accumulated liquid in the planting soil layer 121 can flow directly into the compartment 131 of the water collection area 13 through the overflow bypass pipe 14, thus preventing water from overflowing the sewage treatment tank. For the blocked planting soil layer 121, farmers can remove the planting soil in the nylon mesh bag and replace it with new planting soil. When there is a large amount of scum and bottom mud in the compartment 131 of the water collection area 13, the mud and scum in the compartment 131 can be cleaned out through the overflow bypass pipe 14.

[0044] When the water level in compartment 3 133 of the water collection area 13 is higher than the gravity outflow pipe 135, the liquid in the sewage treatment tank 1 flows into the surrounding water body through the gravity outflow pipe 135. When the DC water pump is directly driven by the solar photovoltaic panel 51, the current generated by the solar photovoltaic panel 51 can directly drive the submersible circulating water pump to run continuously when the sunlight is good, and no energy consumption is generated during the operation. When there are continuous cloudy and rainy days, the output voltage and current of the solar photovoltaic panel 51 are unstable, and the household power supply mode can be switched.

[0045] This application provides a sewage treatment and irrigation device. The water in the sewage treatment tank is continuously circulated and filtered between the water distribution area, the outlet circulation well, the filter media area, and the water collection area under the action of the circulating water pump. Impurities in the water are removed through continuous circulation and filtration. In addition, the surrounding vegetable gardens and woodlands can be irrigated by opening the irrigation valve and closing the return valve, which reduces environmental pollution and makes full use of the nitrogen and phosphorus nutrients in the sewage, thus realizing resource utilization.

[0046] The common English terms or letters used in this invention for clarity of description are for illustrative purposes only and are not limiting interpretations or specific uses. They should not be used to limit the scope of protection of this invention based on their possible Chinese translations or specific letters.

[0047] It should also be noted that in this article, relational terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

Claims

1. A sewage treatment and irrigation device, characterised in that, The sewage treatment module, the power module, the control module and the solar photovoltaic panel assembly are included. The sewage treatment module includes a sewage treatment tank (1), which is sequentially provided with a water distribution area (11), a filter material area (12) and a water collection area (13) from top to bottom; the water distribution area (11) includes a water distribution pipe and a water distribution reflection arc plate assembly; the filter material area (12) includes a planting soil layer (121), a gravel layer (122) and a supporting plate (123); and the water collection area (13) includes a water inlet pipe (130), a partition one (131), a partition two (132), a partition three (133), an inner partition plate (134) and a self-flowing water outlet pipe (135). The power module includes a circulating water pump, the water outlet pipe of which is divided into a irrigation water outlet pipe (21) and a circulating return pipe (22) through a tee joint, the circulating return pipe (22) is communicated with the water distribution pipe of the water distribution area (11), the water inlet pipe (130) of the water collection area (13) is connected with the water outlet pipe of a farmer's septic tank, and the water body in the sewage treatment tank (1) is continuously circulated and filtered among the water distribution area (11), the filter material area (12) and the water collection area (13) under the action of the circulating water pump. The irrigation water outlet pipe (21) is provided with an irrigation valve (211), and the irrigation of the water liquid in the partition three (133) is realized by the opening and closing of the irrigation valve (211). The water distribution pipe includes a water distribution main pipe (111), a water distribution branch pipe (112) and a water distribution vertical pipe (113).

2. The sewage treatment and irrigation device according to claim 1, characterized in that, Three water distribution branch pipes (112) are connected to the water distribution main pipe (111), and the spacing between the water distribution branch pipes (112) is the same. The water distribution branch pipe (112) is horizontally and vertically connected with the water distribution main pipe (111), and the water distribution vertical pipe (113) is vertically connected with the water distribution branch pipe (112). The water distribution reflection arc plate assembly includes a reflection arc plate (101) and a reflection arc plate support (102).

3. The sewage treatment and irrigation device according to claim 1, characterized in that, The reflection arc plate support (102) is welded with the reflection arc plate (101) to support the reflection arc plate (101). The reflection arc plate support (102) is fixedly installed on the water distribution vertical pipe (113). The reflection arc plate assembly corresponds to the water distribution vertical pipe (113) one by one. The water distribution vertical pipe (113) is provided with a return water outlet (1130) which is perpendicular to the geometric center of the reflection arc plate (101). The thickness of the planting soil layer (121) is 150-200mm.

4. The sewage treatment and irrigation device of claim 1, wherein, The gravel layer (122) is located below the planting soil layer (121), the thickness of the gravel layer (122) is 400-500mm, the particle size of the gravel in the gravel layer (122) is 20-50mm, and the particle size of the gravel increases from top to bottom, and the particle size of the gravel in the lowermost layer is the largest. The supporting plate (123) is located below the gravel layer (122), the supporting plate (123) is a glass fiber reinforced plastic grid plate with a hole diameter of 25mm, and the supporting plate (123) is inlaid and fixed on the inner wall of the sewage treatment tank (1). ​ 5. The sewage treatment and irrigation device of claim 1, wherein, The household septic tank outlet pipe is connected with the water inlet pipe (130) of the water collecting area (13), and the water collecting area (13) is divided into three compartments, i.e. compartment one (131), compartment two (132) and compartment three (133) by two inner partitions (134); The lower middle part of the inner partition (134) is provided with a U-shaped water pipe (136), and the three compartments of the water collecting area (13) are connected in series through the U-shaped water pipe (136); The water inlet pipe (130) and the self-flowing outlet pipe (135) are located at the same horizontal plane; the lower end of the outlet pipe (135) is the highest liquid level of the water collecting area (13), and there is a gap between the highest liquid level of the water collecting area (13) and the supporting plate (123).

6. A sewage treatment and irrigation device as claimed in claim 5 wherein, The sewage treatment tank (1) further comprises an overflow bypass pipe (14) vertically installed on one side of the sewage treatment tank (1), one end of the overflow bypass pipe (14) is located in the water distribution area (11) and is higher than the planting soil layer (121) of the filter material area (12) in horizontal height, and the other end of the overflow bypass pipe (14) is located in the gap layer at the upper part of the compartment one (131).

7. The sewage treatment and irrigation device of claim 1, wherein, The power module comprises: a communication pipe (20), a irrigation outlet pipe (21), a irrigation valve (211), a circulation return pipe (22), a return valve (221), a outlet circulation well (23), a submersible circulation pump (24) and a lifting chain (25); one end of the communication pipe (20) is communicated with the compartment three (133), and the other end is communicated with the outlet circulation well (23); the outlet circulation well (23) is a plastic pipe with a sealed bottom, the submersible circulation pump (24) is installed at the bottom of the outlet circulation well (23), the submersible circulation pump (24) is a direct current motor water pump with a working voltage of 12-60V; the highest liquid level in the outlet circulation well (23) is kept at the same horizontal plane with the liquid level of the water collecting area (13); the lifting chain (25) is connected with the submersible circulation pump (24) for lifting the submersible circulation pump (24); the outlet pipe of the submersible circulation pump (24) is divided into the irrigation outlet pipe (21) and the circulation return pipe (22) through a tee joint, the return valve (221) is installed on the circulation return pipe (22), the irrigation valve (211) is installed on the irrigation outlet pipe (21), and the circulation return pipe (22) is communicated with the water distribution main pipe (111) of the water distribution area (11).

8. The sewage treatment and irrigation device of claim 1, wherein, The power module comprises: a self-suction outlet pipe (30), a irrigation outlet pipe (21), a irrigation valve (211), a circulation return pipe (22), a return valve (221) and a self-suction circulation pump (31); one end of the self-suction outlet pipe (30) is communicated with the compartment three (133), and the other end is communicated with the self-suction circulation pump (31); the installation height of the self-suction outlet pipe (30) is higher than that of the self-flowing outlet pipe (135) of the water collecting area (13). The self-suction circulating water pump (31) is installed on the ground, and the self-suction circulating water pump (31) is a direct-current motor water pump with a working voltage of 12-60V; The water outlet pipe of the self-suction circulating water pump (31) is divided into a irrigation water outlet pipe (21) and a circulating backflow pipe (22) through a tee joint, a backflow valve (221) is installed on the circulating backflow pipe (22), a irrigation valve (211) is installed on the irrigation water outlet pipe (21), and the circulating backflow pipe (22) is in communication with the water distribution main pipe (111) of the water distribution area (11).

9. The sewage treatment and irrigation device of claim 1, wherein, The control module comprises a wall-mounted control cabinet (41); the wall-mounted control cabinet (41) is installed above one side of the outer wall of the sewage treatment tank (1); The wall-mounted control cabinet (41) is provided with a circuit breaker, an intermediate relay and an overcurrent protector; The wall-mounted control cabinet (41) is controlled by dual power supply, one of which is sourced from a solar photovoltaic panel assembly, and the other is sourced from a household power supply.

10. The sewage treatment and irrigation device of claim 1, wherein, The solar photovoltaic panel assembly comprises a solar photovoltaic panel (51), a solar photovoltaic panel support (52) and a counterweight base (53), and the counterweight base (53) is directly placed on the ground.

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