Dry-wet alternating modular subsurface flow constructed wetland

Abstract

The invention belongs to the technical field of environmental protection, and mainly relates to a dry-wet alternating modular subsurface flow constructed wetland, which comprises a primary filter tank and a plurality of filler units, the primary filter tanks and the filler units are arranged in a multi-row and multi-column form to form a modular wetland; at least two of the filler units are a first water inlet filler unit and a second water inlet filler unit which are adjacent to the primary filter tank and are provided with water inlets, and at least two of the filler units are a first water outlet filler unit and a second water outlet filler unit which are provided with water outlets; the first water inlet filler unit and the second water inlet filler unit are provided with water inlet distribution pipes, water inlet control valves are arranged between the two water inlets and the primary filter tank, and water outlet control valves are arranged at the two water outlets; the modularized wetland has two sewage treatment routes; the water inlet control valves and the water outlet control valves on the two sewage treatment routes are alternately opened and closed so as to realize alternate wetting and drying treatment of the modular wetland.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial wetlands, and mainly relates to a dry-wet alternating modular subsurface flow artificial wetland. Background Art

[0002] Artificial wetlands mainly use plants, microorganisms, artificial media, etc. to treat sewage. Artificial wetlands basically use gravity flow. There is basically no energy consumption in the sewage treatment process and the operating cost is low. Therefore, they have received high attention. Artificial wetland systems can be divided into surface flow artificial wetlands, subsurface flow artificial wetlands and composite artificial wetlands. Surface flow artificial wetlands occupy a large area and are not suitable in some places. Subsurface flow artificial wetlands have good treatment effects, relatively strong purification capabilities, and low site requirements, but there are problems such as easy clogging.

[0003] At present, modular artificial wetlands are usually used to solve the above-mentioned problem of easy clogging. If a certain place in the modular artificial wetland is blocked, the wetland unit at that place can be taken out separately for cleaning or replacement, which is very convenient and saves resources. For example, a modular detachable artificial wetland is disclosed in the Chinese invention patent application document with application publication number CN104944589A. The artificial wetland is composed of more than one modular matrix, and the modular matrix includes a module frame and a matrix filler. The matrix filler is filled in the matrix frame. The periphery and bottom of the module frame are perforated. The matrix filler includes limestone and river sand, and the river sand layer is laid on the limestone layer. The present invention designs the matrix of the artificial wetland system into a detachable modular structure, which is convenient for the later maintenance and management of the artificial wetland system and is easy to solve the problem of easy clogging.

[0004] When sewage is introduced into an artificial wetland, the artificial wetland is in a wet state. At this time, the artificial wetland purifies the sewage. However, after a certain period of sewage treatment, the artificial wetland needs to stop passing sewage to keep the artificial wetland dry for a period of time. The dry state can provide wetland plants with an opportunity to recuperate, which is conducive to the long-term health and growth of plants and increases the life of the artificial wetland. At the same time, the wetland can also be observed to see if there is a risk of blockage, and treatment can be carried out in advance to prevent blockage during sewage purification. However, the above artificial wetlands cannot meet the needs of wetlands in a dry state and sewage treatment, that is, the existing artificial wetlands cannot take into account both the recuperation needs of the wetland and the sewage treatment needs. Summary of the invention

[0005] The present invention provides a dry-wet alternating modular subsurface flow artificial wetland to solve the problem that the artificial wetland in the prior art cannot take into account both the recuperation demand of the wetland and the sewage treatment demand at the same time.

[0006] To solve the above problems, the present invention adopts the following technical solutions:

[0007] A dry-wet alternating modular subsurface artificial wetland comprises a primary filtering tank and a plurality of packing units; the primary filtering tank and the plurality of packing units are arranged in a plurality of rows and columns and are detachably connected to form a modular wetland; among the plurality of packing units, at least two of the packing units are a first water inlet packing unit and a second water inlet packing unit adjacent to the primary filtering tank and provided with a water inlet, and at least two of the packing units are a first water outlet packing unit and a second water outlet packing unit provided with a water outlet; a water inlet distribution pipe connected to the primary filtering tank through the water inlet is provided at the bottom of the first water inlet packing unit and the second water inlet packing unit, a water inlet control valve is provided between the two water inlets and the primary filtering tank, and a water outlet control valve is provided at the two water outlets; the modular wetland has two sewage treatment routes, namely a first sewage treatment route flowing from the first water inlet packing unit to the first water outlet packing unit and a second sewage treatment route flowing from the second water inlet packing unit to the second water outlet packing unit; the water inlet control valves and the water outlet control valves on the two sewage treatment routes are opened and closed alternately to realize dry-wet alternating treatment of the modular wetland.

[0008] Beneficial effect: The two sewage treatment routes are independent of each other. When one of the sewage treatment routes is used, the sewage treatment route can be opened by opening the corresponding water inlet control valve and the water outlet control valve, so that one of the sewage treatment routes is in a sewage treatment state and the other sewage treatment route is in a dry state. The two sewage treatment routes are opened alternately to enable the wetland to achieve alternating dry and wet treatment, so that the wetland's recuperation needs and sewage treatment needs are taken into account at the same time.

[0009] Furthermore, each packing unit includes a coarse material matrix, a medium material matrix and a fine material matrix arranged in sequence from top to bottom, soil is provided above the coarse material matrix, plants are planted on the soil, and plant planting pots containing planting matrix are provided in the medium material matrix and the fine material matrix.

[0010] Beneficial effects: The arrangement of multiple layers of substrate materials increases the degree of sewage purification.

[0011] Furthermore, the packing unit is a rectangular parallelepiped structure.

[0012] Beneficial effects: The rectangular structure facilitates the connection of multiple rows and columns of modular wetlands, so that there are no gaps between the filling units when they are connected, ensuring maximum use of the area of ​​the use area.

[0013] Furthermore, the modular wetland has a three-row and three-column structure.

[0014] Furthermore, the filling unit includes a first filling unit located in the middle position of the modular wetland, a second filling unit located in front of the first filling unit, a third filling unit located behind the first filling unit, and a fourth filling unit located on the right side of the second filling unit, the primary filter tank is located on the left side of the first filling unit, the first water inlet filling unit is located in front of the primary filter tank, the second water inlet filling unit is located behind the primary filter tank, the first water outlet filling unit is located on the right side of the first filling unit, and the second water outlet filling unit is located behind the first water outlet filling unit.

[0015] Furthermore, pipe inlets corresponding to the two sewage treatment routes are respectively provided between the fourth filler unit and the first water outlet filler unit, and between the first filler unit and the first water outlet filler unit, and a water outlet distribution pipe connected to the two pipe inlets is provided at the bottom of the first water outlet filler unit.

[0016] Beneficial effects: The existence of the water distribution pipe enables the sewage to be evenly discharged to the bottom of the corresponding filler unit. The sewage flows upward under the action of gravity and capillary action, which helps to utilize the multi-layer matrix and increases the degree of sewage purification in the wetland.

[0017] Furthermore, waterproof walls are provided between the first filler unit and the second filler unit, between the fourth filler unit and the first water outlet filler unit, between the first filler unit and the first water outlet filler unit, and between the third filler unit and the second water outlet filler unit to prevent the sewage in the first sewage treatment route and the second sewage treatment route from infiltrating into each other.

[0018] Beneficial effect: Between two packing units without waterproof walls, sewage can flow on its own. The existence of the waterproof wall prevents the first sewage treatment route and the second sewage treatment route from interfering with each other in the front and middle parts, which is conducive to the separate control of the two treatment routes. Because the pollutant concentration of sewage is low when it flows to the rear of the sewage treatment route, there is no problem with the two sewage treatment routes intersecting at the rear.

[0019] Furthermore, adjacent packing units are connected via a snap-fit ​​structure.

[0020] Beneficial effect: The existence of the snap-on structure facilitates the placement and removal of the packing unit.

[0021] Furthermore, each packing unit is provided with a lifting ring.

[0022] Beneficial effect: When a packing unit is blocked or in other situations, the packing unit can be lifted out through the lifting ring for easy operation.

[0023] Furthermore, a clay anti-seepage layer is provided at the bottom of each packing unit.

[0024] Beneficial effect: Prevent sewage from seeping downward and polluting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0026] Figure 1 A top view of the present invention;

[0027] Figure 2 It is a front view of the present invention;

[0028] Figure 3 Schematic diagram of the structure of the packing unit.

[0029] Description of reference numerals:

[0030] 1. Primary filtration tank; 2. First water inlet filling unit; 3. Second filling unit; 4. Fourth filling unit; 5. First filling unit; 6. First water outlet filling unit; 7. Second water inlet filling unit; 8. Third filling unit; 9. Second water outlet filling unit; 10. First water inlet distribution pipe; 11. Second water inlet distribution pipe; 12. Water outlet distribution pipe; 13. Second water inlet; 14. Tank inlet; 15. First water inlet; 16. Second water outlet; 17. First water outlet; 18. Clip-on structure; 19. First pipe inlet; 20. Second pipe inlet; 21. Second grille; 22. Lifting ring; 23. Coarse material matrix; 24. Plant planting pot; 25. Medium material matrix; 26. Fine material matrix; 27. First grille; 28. Waterproof wall. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0032] Various non-limiting embodiments of the present invention are described in detail below. Any number of elements in the accompanying drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0033] Embodiments of the dry-wet alternating modular subsurface flow artificial wetland provided by the present invention:

[0034] like Figure 1 and Figure 2 As shown, the dry-wet alternating modular subsurface artificial wetland includes a primary filter tank 1 and eight filler units of the same structure. The primary filter tank 1 and the eight filler units form a modular wetland with three rows and three columns. The modular wetland has a first sewage treatment route and a second sewage treatment route that do not interfere with each other in the front middle. In other embodiments, the modular wetland is not limited to the three-row and three-column structure in the present application, and may also adopt an n-row and m-column structure, where n is greater than or equal to 3, m is greater than or equal to 3, and m and n are not 3 at the same time, and m and n are both positive integers. At this time, the positions of the first water outlet 17 and the second water outlet 16 are not specifically limited, and only need to satisfy the existence of two sewage treatment routes.

[0035] like Figure 2 and Figure 3 As shown, each packing unit is a rectangular parallelepiped structure, and each packing unit includes a coarse material matrix 23, a medium material matrix 25 and a fine material matrix 26 arranged in sequence from top to bottom. Soil is provided above the coarse material matrix 23, and plants are planted on the soil. Plant planting pots 24 containing planting matrix are provided in the medium material matrix 25 and the fine material matrix 26 for plant growth.

[0036] like Figure 1 As shown, the filling unit includes a first filling unit 5, a second filling unit 3, a third filling unit 8, a fourth filling unit 4, a first water inlet filling unit 2, a second water inlet filling unit 7, a first water outlet filling unit 6 and a second water outlet filling unit 9. The first filling unit 5 is located in the middle of the modular wetland, the second filling unit 3 is located in front of the first filling unit 5, the third filling unit 8 is located behind the first filling unit 5, the primary filter tank 1 is located on the left side of the first filling unit 5, the first water inlet filling unit 2 is located in front of the primary filter tank 1, the second water inlet filling unit 7 is located behind the primary filter tank 1, the fourth filling unit 4 is located on the right side of the second filling unit 3, the first water outlet filling unit 6 is located on the right side of the first filling unit 5, and the second water outlet filling unit 9 is located behind the first water outlet filling unit 6. The first sewage treatment route is from the primary filter tank 1 to the first water inlet filling unit 2, the second filling unit 3, the fourth filling unit 4, the first water outlet filling unit 6 or to the second water outlet filling unit 9. The second sewage treatment route is from the primary filter tank 1 to the second water outlet filling unit 9, the third filling unit 8, the first filling unit 5, the first water outlet filling unit 6 or to the second water outlet filling unit 9.

[0037] like Figure 1 and Figure 2As shown, the primary filter pool 1 is provided with an inlet 14 for water to flow into the primary filter pool 1, the first water inlet filler unit 2 and the second water inlet filler unit 7 are respectively provided with a first water inlet 15 and a second water inlet 13, a first water inlet control valve is provided between the first water inlet 15 and the primary filter pool 1, and a second water inlet control valve is provided between the second water inlet 13 and the primary filter pool 1. The first water outlet filler unit 6 and the second water outlet filler unit 9 are respectively provided with a first water outlet 17 and a second water outlet 16, the first water outlet 17 is provided with a first water outlet control valve, and the second water outlet 16 is provided with a second water outlet control valve. The first sewage treatment route can be opened and closed by controlling the first water inlet control valve and the first water outlet control valve, and the second sewage treatment route can be opened and closed by controlling the second water inlet control valve and the second water outlet control valve.

[0038] like Figure 1 As shown, a first water inlet distribution pipe 10 connected to a first water inlet 15 is provided at the bottom of the first water inlet filling unit 2, a second water inlet distribution pipe 11 connected to a second water inlet 13 is provided at the bottom of the second water inlet filling unit 7, a first pipe inlet 19 and a second pipe inlet 20 corresponding to two sewage treatment routes are provided between the fourth filling unit 4 and the first water outlet filling unit 6, and between the first filling unit 5 and the first water outlet filling unit 6, respectively, and a water outlet distribution pipe 12 connected to both the first pipe inlet 19 and the second pipe inlet 20 is provided at the bottom of the first water outlet filling unit 6. The existence of the first water inlet distribution pipe 10, the second water inlet distribution pipe 11 and the water outlet distribution pipe 12 enables the sewage to be evenly discharged to the bottom of the corresponding filling unit, and the sewage flows upward under gravity and capillary action, which is helpful for the utilization of the multi-layer matrix and increases the degree of sewage purification by the wetland.

[0039] like Figure 1 and Figure 2 As shown, waterproof walls 28 are provided between the first filler unit 5 and the second filler unit 3, between the fourth filler unit 4 and the first water outlet filler unit 6, between the first filler unit 5 and the first water outlet filler unit 6, and between the third filler unit 8 and the second water outlet filler unit 9, so as to prevent the first sewage treatment route and the second sewage treatment route from interfering with each other in the front middle part. Between the two filler units without the waterproof wall 28, the sewage can flow by itself. The existence of the waterproof wall 28 prevents the first sewage treatment route and the second sewage treatment route from interfering with each other in the front middle part, which is conducive to the separate control of the two treatment routes.

[0040] like Figure 1As shown, the modular wetland is provided with a snap-on structure 18 between the first water inlet filling unit 2 and the second filling unit 3, between the second filling unit 3 and the fourth filling unit 4, between the first filling unit 5 and the third filling unit 8, between the first water outlet filling unit 6 and the second water outlet filling unit 9, and between the second water inlet filling unit 7 and the third filling unit 8, so as to facilitate the placement of each filling unit. Each filling unit is provided with a lifting ring 22. When a filling unit is blocked or in other situations, the filling unit is lifted out for processing through the lifting ring 22, which is convenient for operation. A clay anti-seepage layer is provided at the bottom of each filling unit. A first grid 27 is provided between the first water inlet 15 and the primary filter pool 1, and a second grid 21 is provided between the second water inlet 13 and the primary filter pool 1. The presence of the first grid 27 and the second grid 21 prevents larger impurities in the primary filter pool 1 from entering the filling unit.

[0041] The working process of the present invention is as follows:

[0042] Sewage enters the primary filter tank 1 from the tank inlet 14, the first water inlet control valve and the first water outlet control valve are opened, the sewage enters the first sewage treatment route from the first water inlet 15, the sewage is purified in the first sewage treatment route, and the purified sewage is discharged from the first water outlet 17 or the second water outlet 16. During this process, the second water inlet control valve and the second water outlet control valve are in a closed state, and the second treatment route is in a dry state; when the packing unit in the first sewage treatment route needs maintenance, the first water inlet control valve and the first water outlet control valve are closed, and the second water inlet control valve and the second water outlet control valve are opened, the sewage enters the second sewage treatment route from the second water inlet 13, the sewage is purified in the second sewage treatment route, and the purified sewage is discharged from the first water outlet 17 or the second water outlet 16. During this process, the first treatment route is in a dry state.

[0043] The two sewage treatment routes are independent of each other. When one of the sewage treatment routes is used, the sewage treatment route can be opened by opening the corresponding water inlet control valve and the water outlet control valve, so that one of the sewage treatment routes is in a sewage treatment state and the other sewage treatment route is in a dry state. The two sewage treatment routes are opened alternately to enable the wetland to achieve alternating dry and wet treatment, so that the wetland's recuperation needs and sewage treatment needs can be taken into account at the same time.

[0044] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0045] In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dry-wet alternating modular subsurface flow artificial wetland, characterized in that: It includes a primary filter tank and a plurality of filler units; The primary filter tank and the plurality of filler units are arranged in a plurality of rows and columns and are detachably connected to form a modular wetland; among the plurality of filler units, at least two of the filler units are first water inlet filler units and second water inlet filler units adjacent to the primary filter tank and provided with a water inlet, and at least two of the filler units are first water outlet filler units and second water outlet filler units provided with a water outlet; The bottom of the first water inlet filling unit and the second water inlet filling unit are provided with a water inlet distribution pipe connected with the primary filter tank through the water inlet, a water inlet control valve is provided between the two water inlets and the primary filter tank, and the two water outlets are provided with a water outlet control valve; The modular wetland has two sewage treatment routes, namely a first sewage treatment route flowing from a first water inlet filling unit to a first water outlet filling unit and a second sewage treatment route flowing from a second water inlet filling unit to a second water outlet filling unit; the water inlet control valves and the water outlet control valves on the two sewage treatment routes are alternately opened and closed to realize the dry-wet alternating treatment of the modular wetland.

2. The dry-wet alternating modular subsurface flow artificial wetland according to claim 1, characterized in that: Each packing unit includes a coarse material matrix, a medium material matrix and a fine material matrix arranged in sequence from top to bottom. Soil is provided above the coarse material matrix, plants are planted on the soil, and plant planting pots containing planting matrix are provided in the medium material matrix and the fine material matrix.

3. The dry-wet alternating modular subsurface flow artificial wetland according to claim 2, characterized in that: The packing unit is a rectangular parallelepiped structure.

4. The dry-wet alternating modular subsurface flow artificial wetland according to claim 3, characterized in that: The modular wetland has a three-row and three-column structure.

5. The dry-wet alternating modular subsurface flow constructed wetland according to claim 4, characterized in that: The filling unit includes a first filling unit located in the middle position of the modular wetland, a second filling unit located in front of the first filling unit, a third filling unit located behind the first filling unit, and a fourth filling unit located on the right side of the second filling unit. The primary filter tank is located on the left side of the first filling unit, the first water inlet filling unit is located in front of the primary filter tank, the second water inlet filling unit is located behind the primary filter tank, the first water outlet filling unit is located on the right side of the first filling unit, and the second water outlet filling unit is located behind the first water outlet filling unit.

6. The dry-wet alternating modular subsurface flow constructed wetland according to claim 5, characterized in that: Inlets corresponding to the two sewage treatment routes are respectively arranged between the fourth filler unit and the first water outlet filler unit, and between the first filler unit and the first water outlet filler unit. An outlet water distribution pipe connected to the two inlets is arranged at the bottom of the first water outlet filler unit.

7. The dry-wet alternating modular subsurface flow constructed wetland according to claim 6, characterized in that: Waterproof walls are provided between the first filling unit and the second filling unit, between the fourth filling unit and the first water outlet filling unit, between the first filling unit and the first water outlet filling unit, and between the third filling unit and the second water outlet filling unit to prevent the sewage in the first sewage treatment route and the second sewage treatment route from penetrating each other.

8. A dry-wet alternating modular subsurface flow constructed wetland according to any one of claims 1 to 7, characterized in that: Adjacent packing units are connected by a snap-fit ​​structure.

9. A dry-wet alternating modular subsurface flow constructed wetland according to any one of claims 1 to 7, characterized in that: Each packing unit is equipped with a lifting ring.

10. A dry-wet alternating modular subsurface flow constructed wetland according to any one of claims 1 to 7, characterized in that: A clay anti-seepage layer is provided at the bottom of each packing unit.

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