Domestic sewage treatment system

Abstract

The utility model discloses a domestic sewage treatment system which comprises a greenhouse, aquatic plants are planted in the greenhouse, the aquatic plants are planted on a subsurface flow constructed wetland, the subsurface flow constructed wetland comprises biological stuffing, a first water pipe is embedded in the upper portion of the biological stuffing, and an ecological slow-release layer is laid at the bottom of the biological stuffing. One end of the first water pipe extends out of the left side of the subsurface flow constructed wetland and is connected with a sewage pretreatment module buried underground, the bottom of the right side of the subsurface flow constructed wetland is connected with the middle of the left side of an active backflow pool buried underground through a second water pipe, and the bottom of the left side of the active backflow pool is connected with the sewage pretreatment module through a third water pipe. The right middle part of the active reflux tank is connected with water through a fourth water pipe. The water and fertilizer resources of the incoming water of the constructed wetland and the aquatic plant cultivation greenhouse are utilized, coupling co-construction of the constructed wetland and facility agriculture is achieved, an ecological environment-friendly and green agriculture coupling co-construction innovative demonstration is created, the constructed wetland is constructed under the aquatic plant cultivation greenhouse, and the land use problem of the constructed wetland is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of rural domestic sewage treatment. Specifically, it relates to a domestic sewage treatment system. Background Art

[0002] Constructed wetland is a technology for treating sewage and pollutants by simulating natural wetland ecosystems. These systems utilize the natural purification ability of plants, microorganisms, and soil to remove pollutants in water. Constructed wetlands are generally divided into two types: surface flow wetlands and subsurface flow wetlands, each with its application scenarios and treatment advantages. Surface flow wetlands are characterized by open water surfaces and are suitable for treating sewage with large flow rates; subsurface flow wetlands treat sewage through underground flow and are more suitable for small-scale or household-level sewage treatment. Constructed wetlands have been widely used in the field of sewage treatment. However, restricted by existing technologies, when constructed wetlands are used for rural domestic sewage treatment in northern regions, they often face the following three problems: the problem of low purification efficiency of wetlands caused by low winter temperatures; the problem of high power consumption required for power lifting and aeration of sewage; and the problem of low total nitrogen removal efficiency of sewage. Summary of the Utility Model

[0003] In view of the above technical problems in the related art, the utility model provides a domestic sewage treatment system that can solve the above problems.

[0004] To achieve the above technical objectives, the technical solution of the utility model is realized as follows:

[0005] A domestic sewage treatment system includes a greenhouse in which aquatic plants are planted. The aquatic plants are planted on a subsurface flow constructed wetland. The subsurface flow constructed wetland includes biological fillers. A water pipe 1 is buried in the upper part of the biological fillers. An ecological slow-release layer is laid at the bottom of the biological fillers. One end of the water pipe 1 extends out of the left side of the subsurface flow constructed wetland and is connected to a sewage pretreatment module buried underground. The bottom right side of the subsurface flow constructed wetland is connected to the middle left side of an activated return pool buried underground through a water pipe 2. The bottom left side of the activated return pool is connected to the sewage pretreatment module through a water pipe 3. The middle right side of the activated return pool is connected to a water body through a water pipe 4.

[0006] Further, the sewage pretreatment module includes a hydrolysis acidification sedimentation tank connected to a sewage inlet pipe, and a denitrification tank is provided at the water outlet end of the hydrolysis acidification sedimentation tank.

[0007] Further, a grille is provided between the hydrolysis acidification sedimentation tank and the denitrification tank, and a pump group is also installed in the denitrification tank.

[0008] Further, the pump group is electrically connected to the power grid and photovoltaic panels installed on the ground.

[0009] Further, the pump set is connected to the first water pipe, and a plurality of water outlet holes are evenly formed in the pipe part of the first water pipe located in the subsurface flow constructed wetland.

[0010] Further, an air inlet pipe and an air outlet pipe are respectively arranged on the left and right sides of the greenhouse. One end of the air inlet pipe is buried in the biological filler, the other end extends out of the greenhouse and has a downward opening. One end of the air outlet pipe is buried in the biological filler, the other end extends out of the greenhouse, and a non-powered wind cap is connected to the opening.

[0011] Further, one end of the third water pipe extends into the denitrification tank, and an electric control valve is arranged at the water outlet end of the third water pipe.

[0012] Further, the bottom surface of the active reflux tank is higher than the bottom surface of the denitrification tank.

[0013] Further, the water body is a pond, and aquatic animals and plants are cultured in the water body.

[0014] The beneficial effects of the present utility model: This application utilizes the water and fertilizer resources of the water inflow of the constructed wetland and the aquatic plant cultivation greenhouse to realize the coupled construction of the constructed wetland and facility agriculture, create an innovative demonstration of the coupled construction of ecological environmental protection and green agriculture, and build a constructed wetland directly below the aquatic plant cultivation greenhouse to solve the land use problem of the constructed wetland. The heat preservation effect of the greenhouse can ensure the purification effect of the constructed wetland throughout the year, which is particularly significant for cold regions in the north. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] The following further elaborates on the present utility model according to the drawings.

[0017] Figure 1 is a structural diagram of a domestic sewage treatment system according to an embodiment of the present utility model;

[0018] Figure 2 is Figure 1 an enlarged view of A in

[0019] Figure 3 is Figure 1 an enlarged view of B in

[0020] Figure 4 is Figure 1 an enlarged view of C in

[0021] In the figure:

[0022] 1. Photovoltaic panel; 2. Grille; 3. Pump set; 4. Electric control valve; 5. Greenhouse; 6. Inlet pipe; 7. Outlet pipe; 8. Aquatic plants; 9. Pipe 1; 10. Biological filler; 11. Ecological slow-release layer; 12. Pipe 3; 13. Active return pool; 14. Water body; 15. Pipe 2; 17. Pipe 4; 18. Hydrolysis acidification sedimentation tank; 19. Denitrification tank. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0024] As Figures 1-4 shown, according to the present invention, a domestic sewage treatment system is disclosed, including a greenhouse 5 in which aquatic plants 8 are planted. The aquatic plants 8 are planted on a subsurface flow constructed wetland, which includes a biological filler 10. A pipe 1 9 is buried in the upper part of the biological filler 10, and an ecological slow-release layer 11 is laid at the bottom of the biological filler 10. One end of the pipe 1 9 extends out of the left side of the subsurface flow constructed wetland and is connected to a sewage pretreatment module buried underground. The bottom right side of the subsurface flow constructed wetland is connected to the middle left side of an active return pool 13 buried underground through a pipe 2 15. The bottom left side of the active return pool 13 is connected to the sewage pretreatment module through a pipe 3 12. The middle right side of the active return pool 13 is connected to a water body 14 through a pipe 4 17.

[0025] Embodiment 1:

[0026] In this application, the sewage pretreatment module includes a hydrolysis acidification sedimentation tank 18 and a denitrification tank 19. Rural domestic sewage enters the hydrolysis acidification sedimentation tank 18 through a sewage inlet pipe, where hydrolysis acidification is carried out by microorganisms and then sedimentation occurs. The sewage treated by the hydrolysis acidification sedimentation tank 18 is discharged into the denitrification tank 19. A grille 2 is provided between the hydrolysis acidification sedimentation tank 18 and the sewage discharged into the denitrification tank 19, which can preliminarily intercept large particle suspended matters. The sewage entering the denitrification tank 19 can be pumped into the subsurface flow constructed wetland for deep purification through a pump set 3 and a pipe 1 9. Among them, the pump set 3 is preferentially powered by a photovoltaic panel 1 installed on the ground, with grid auxiliary power supply. The power supply power of the photovoltaic panel is 200 watts / square meter, with a total of 8m 2 photovoltaic panels, the power of the submersible pump is 1.5 kilowatts, the head is 10 meters, and Q = 5 - 10 cubic meters per hour.

[0027] In this application, the subsurface flow constructed wetland is located in greenhouse 5, and aquatic plants 8 are planted on the subsurface flow constructed wetland, which solves the problem of land use for the constructed wetland. Moreover, greenhouse 5 plays an important role in the use of the subsurface flow constructed wetland in winter. The subsurface flow constructed wetland includes biological fillers 10 (the biological fillers 10 can be gravel, ceramsite, etc., and soil is laid above the biological fillers 10). A first water pipe 9 is buried in the upper part of the biological fillers 10, and a number of water outlet holes are evenly opened on the first water pipe 9. The water outlet holes include two rows, which are divided into a front row and a rear row, and are horizontally oriented. An ecological slow-release layer 11 (the ecological slow-release layer 11 can be activated carbon, bentonite, modified clay, biochar, a composite material containing activated carbon and modified minerals, etc.) is laid at the bottom of the biological fillers 10. The ecological slow-release layer has a large specific surface area, enabling a large number of highly active microorganisms to adhere in the slow-release layer, promoting sediment mineralization, improving the sediment-water interface habitat, and having a significant inhibitory effect on the release of pollutants in the sediment). The sewage is transported to the subsurface flow constructed wetland through the pump group 3. After evenly flowing through the biological fillers 10 inside the wetland, it is discharged from the bottom. During this process, the facility agriculture-coupled subsurface flow constructed wetland transmits air to the inside of the bed through the air inlet pipe 6 and the air outlet pipe 7 to accelerate the oxygenation of the water body. The subsurface flow constructed wetland utilizes the adsorption and redox effects of the soil and biological fillers 10, the absorption of nitrogen and phosphorus inorganic salts by plants, and the degradation effects of the microorganisms attached to the plant roots and fillers to achieve the removal of organic pollutants, nitrogen source, and phosphorus source pollutants in the sewage, and can also significantly reduce the chromaticity and turbidity of the water body. It can also be made to have good cold resistance performance by inoculating and culturing a relatively high proportion of cold-resistant bacteria and the heat preservation structure of the bed. Efficacy parameters: For rural domestic sewage (gray water + black water), the removal rates of COD, ammonia nitrogen, total nitrogen, and total phosphorus are not less than 85%, 80%, 70%, and 80% respectively, meeting the discharge, agricultural irrigation, and reuse standards.

[0028] The water after deep purification is discharged into the activated reflux pool 13. The activated reflux pool 13 can, through liquid level control, reflux one-third of the water (nitrification liquid) to the denitrification pool 19 through the third water pipe 12 for denitrification, and two-thirds of the water is discharged into the small water body 14. The water refluxed to the denitrification pool 19 can achieve denitrification and nitrogen removal under the action of denitrifying bacteria, realizing efficient nitrogen removal; while for the small water body 14, such as a pond, the water surface in the pond is naturally oxygenated, and plant photosynthesis forms an organic carbon source. Combining the planting of aquatic plants provides habitats for aquatic animals, spawning grounds and shelters for fish, shrimps, shellfishes, and crabs. Technologies such as ecological islands, underwater micro-topography, and underwater forests can be combined to carry out diversified ecological restoration of the river channel. While purifying the water quality, it also has a landscape effect of beautifying the environment. The treated water can be used for agricultural irrigation.

[0029] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A domestic sewage treatment system, characterized in that, It includes a greenhouse (5) in which aquatic plants (8) are planted. The aquatic plants (8) are planted on a subsurface flow constructed wetland, which includes biological fillers (10). A water pipe 1 (9) is buried in the upper part of the biological fillers (10), and an ecological slow-release layer (11) is laid at the bottom of the biological fillers (10). One end of the water pipe 1 (9) extends out of the left side of the subsurface flow constructed wetland and is connected to a sewage pretreatment module buried underground. The right bottom of the subsurface flow constructed wetland is connected to the middle left of an activated reflux pool (13) buried underground through a water pipe 2 (15). The left bottom of the activated reflux pool (13) is connected to the sewage pretreatment module through a water pipe 3 (12). The middle right of the activated reflux pool (13) is connected to a water body (14) through a water pipe 4 (17).

2. The domestic sewage treatment system according to claim 1, characterized in that, The sewage pretreatment module includes a hydrolysis acidification sedimentation tank (18) connected to a sewage inlet pipe, and a denitrification tank (19) is provided at the water outlet end of the hydrolysis acidification sedimentation tank (18).

3. A domestic sewage treatment system according to claim 2, characterized in that, A grille (2) is provided between the hydrolysis acidification sedimentation tank (18) and the denitrification tank (19), and a pump group (3) is also installed in the denitrification tank.

4. A domestic sewage treatment system according to claim 3, characterized in that, The pump group (3) is electrically connected to the power grid and a photovoltaic panel (1) installed on the ground.

5. A domestic sewage treatment system according to claim 4, characterized in that, The pump group (3) is connected to the water pipe 1 (9), and a number of water outlet holes are evenly opened on the pipe part of the water pipe 1 (9) located in the subsurface flow constructed wetland.

6. A domestic sewage treatment system according to claim 1, characterized in that, An air inlet pipe (6) and an air outlet pipe (7) are respectively provided on the left and right sides of the greenhouse (5). One end of the air inlet pipe (6) is buried in the biological fillers (10), and the other end extends out of the greenhouse (5) and has an opening facing downwards. One end of the air outlet pipe (7) is buried in the biological fillers (10), and the other end extends out of the greenhouse (5) and the opening is connected to a non-powered wind cap.

7. A domestic sewage treatment system according to claim 2, characterized in that, One end of the water pipe 3 (12) extends into the denitrification tank (19), and an electric control valve (4) is provided at the water outlet end of the water pipe 3 (12).

8. A domestic sewage treatment system according to claim 7, characterized in that, The bottom surface of the activated reflux pool (13) is higher than the bottom surface of the denitrification tank (19).

9. A domestic sewage treatment system according to claim 1, characterized in that, The water body (14) is a pond, and aquatic animals and plants are cultured in the water body (14).

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