Multi-stage combined artificial wetland simulation experiment device

Abstract

The invention relates to a multi-stage combined artificial wetland simulation experiment device. The device comprises a first box body used for simulating a horizontal subsurface flow constructed wetland. An opening is formed in the upper end of the first box body, a first partition plate and a second partition plate are sequentially arranged in the first box body to divide an inner cavity of the first box body into a first water distribution tank, a first filling cavity and a first water collection tank, a first water inlet pipe is arranged in the first water distribution tank, and the first water collection tank conveys water into the second box body through a first water drainage pipe. And the second box body is used for simulating the surface flow constructed wetland. The upper end of the second box is open, a water outlet of the first drainage pipe is located at one end of the second box, and a second drainage pipe is arranged on the side wall of the other end of the second box. Shelves are arranged in the inner cavities of the first filling cavity and the second box body and are used for transplanting aquatic plants. Through grading treatment, the grading effect of the natural wetland is effectively simulated, and the device can be used for researching the multi-stage combined constructed wetland by changing parameters such as the water flow speed, the water level and the wetland area.

Description

Technical Field

[0001] The invention relates to the technical field of artificial wetlands, and in particular to a multi-stage combined artificial wetland simulation experimental device. Background Art

[0002] Constructed wetlands (CWS) are a type of sewage treatment system that uses natural processes such as aquatic plants, substrates and microorganisms for purification. As an effective water pollution control technology, constructed wetlands have strong adaptability and can function under different hydraulic conditions. In recent years, due to their good compatibility and adaptability, constructed wetlands have been widely used in various water body treatments, covering various forms such as horizontal flow, vertical flow and surface flow wetlands. These forms can effectively treat different types of pollutants and adapt to different hydraulic conditions. Existing studies on constructed wetlands mostly focus on performance evaluation under static hydraulic conditions, ignoring the complex effects of dynamic hydraulic conditions in actual natural environments on the performance of wetland systems. Factors such as changes in flow rate and fluctuations in water level will significantly affect the purification capacity of wetlands. Especially under different hydraulic conditions, how to improve the adaptability and treatment performance of wetland systems has become one of the core issues that need to be urgently addressed in current research.

[0003] Multi-stage combined artificial wetlands significantly improve the treatment efficiency of the system by combining multiple wetland types and utilizing the advantages of each wetland. In the combined system, different wetland levels undertake different pollutant removal tasks according to their characteristics. For example, surface flow wetlands are conducive to the denitrification process, but weakly support nitrification reactions; while subsurface flow wetlands are suitable for nitrogen nitrification reactions. In practical applications, multi-stage combined wetlands can more effectively remove pollutants by rationally configuring wetland types, especially for complex water quality and multiple pollutants. However, most of the current research focuses on the performance evaluation of a single wetland type, and lacks a comprehensive study of the performance of a multi-stage combined wetland system. Therefore, there is a need for a simulation experimental device that can conduct a comprehensive study of a multi-stage combined wetland system. Summary of the invention

[0004] The purpose of the present invention is to provide a multi-stage combined artificial wetland simulation experimental device to solve the above-mentioned technical problems existing in the prior art.

[0005] To achieve the above purpose, a multi-stage combined artificial wetland simulation experimental device of the present invention adopts the following technical scheme: a multi-stage combined artificial wetland simulation experimental device, comprising

[0006] The first box is used to simulate a horizontal subsurface flow artificial wetland; the first box has an opening at the upper end, and a first partition and a second partition are sequentially arranged inside the first box to divide the inner cavity of the first box into a first water distribution trough, a first filling cavity and a first water collection trough, and the first partition and the second partition are both provided with connecting holes; a first water inlet pipe is arranged in the first water distribution trough, and the first water collection trough delivers water to the second box through a first drain pipe;

[0007] The second box is used to simulate the surface flow artificial wetland; the upper end of the second box is open, the outlet of the first drainage pipe is located at one end of the second box, and the second drainage pipe is arranged on the side wall of the other end of the second box;

[0008] The first filling cavity and the inner cavity of the second box are both provided with shelves for transplanting aquatic plants.

[0009] A first groove is arranged on the cavity wall of the first filling cavity, and a first movable partition is movably inserted and pulled out of the first groove to divide the first filling cavity into at least two experimental cavities.

[0010] A second groove is arranged on the wall of the second box, and a second movable partition is movably inserted and pulled out of the second groove to divide the inner cavity of the second box into at least two experimental cavities.

[0011] A plurality of transplanting cups are arranged on the shelf for transplanting aquatic plants.

[0012] Each of the shelves is provided with a hanging rack for hooking on the cavity wall of the corresponding experimental cavity.

[0013] There are multiple first drainage pipes, which are arranged at intervals in the up-down direction.

[0014] There are multiple second drainage pipes, which are arranged at intervals in the up-down direction.

[0015] The first filling cavity and the inner cavity of the second box body are both filled with a matrix layer.

[0016] The matrix layer comprises a gravel layer, a volcanic rock layer and a zeolite layer which are sequentially arranged from bottom to top.

[0017] The multi-stage combined artificial wetland simulation experimental device also includes a third box and a fourth box. The third box is used to simulate a horizontal subsurface flow artificial wetland. The third box is provided with a second water distribution trough, a second filling chamber and a second water collection trough. The second drain pipe extends into the second water distribution trough. The second water collection trough is connected to the third drain pipe; the third drain pipe is connected to the fourth box. The fourth box is used to simulate a surface flow artificial wetland.

[0018] The beneficial effects of the present invention are as follows: the first box and the second box are connected, and the first box and the second box are used to simulate the horizontal subsurface flow wetland and the surface flow wetland respectively. Through the graded treatment, the graded effect of the natural wetland is effectively simulated, and the treatment efficiency and system stability are improved. The device can study the multi-stage combined artificial wetland by changing the hydraulic parameters such as the water flow velocity and the water level.

[0019] Furthermore, the arrangement of the first partition and the second partition can change the wetland area of ​​the simulated wetland type, and can explore the influence of the wetland area ratio of different wetland types on the multi-stage combined artificial wetland. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an embodiment of a multi-stage combined artificial wetland simulation experimental device of the present invention;

[0021] Figure 2 yes Figure 1 A schematic diagram of the structure after the movable partitions are inserted into each box;

[0022] Figure 3 yes Figure 1 A schematic diagram of the structure of the first box;

[0023] Figure 4 yes Figure 1 Schematic diagram of the structure of the second box. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0025] It should be noted that, unless otherwise defined, the technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] An embodiment of a multi-stage combined artificial wetland simulation experimental device of the present invention is as follows Figure 1-Figure 4As shown, it includes a first box 1, a second box 2, a third box 3 and a fourth box 4 arranged in sequence. The first box 1 and the third box 3 are used to simulate horizontal subsurface artificial wetlands, and the two have the same structure but different sizes. The second box 2 and the fourth box 4 are used to simulate surface flow artificial wetlands, and the two have the same structure but different sizes. The height of the first box 1 is greater than the height of the second box 2, the height of the second box 2 is greater than the height of the third box 3, and the height of the third box 3 is greater than the height of the fourth box 4. In other words, there is a height difference between any two adjacent artificial wetlands, and each box adopts a structure of front-end water inlet and end-end water outlet.

[0027] Take the first box body 1 and the second box body 2 as an example for introduction: the upper end of the first box body 1 is open, and the first partition plate 5 and the second partition plate 6 are sequentially arranged inside the first box body to divide the inner cavity of the first box body into a first water distribution trough 7, a first filling cavity 8 and a first water collection trough 9, and the first partition plate 5 and the second partition plate 6 are both provided with connecting holes 10. A first water inlet pipe 11 is arranged in the first water distribution trough 7, and the first water collection trough 9 delivers water to the second box body 2 through a first drain pipe 12. A first groove 14 is arranged on the cavity wall of the filling cavity of the first box body, and a first movable partition plate 13 is movably inserted and pulled out in the first groove to divide the filling cavity into at least two experimental cavities. In this embodiment, the number of the first grooves is a pair, and the number of the first movable partition plate is one, which divides the first filling cavity into two experimental cavities.

[0028] The upper end of the second box 2 is open, the outlet of the first drain pipe is located at one end of the second box, and a second drain pipe is provided on the side wall of the other end of the second box. A second groove is provided on the box wall of the second box, and a second movable partition 17 is movably inserted and pulled out of the second groove to divide the inner cavity of the second box into at least two experimental cavities. In this embodiment, the number of the second grooves is a pair, and the number of the second movable partition is one, which divides the inner cavity of the second box into two experimental cavities.

[0029] The first filling cavity and the inner cavity of the second box are both provided with a shelf 15, that is, each experimental cavity is provided with a shelf. The shelf is used to transplant aquatic plants. Specifically, a plurality of transplanting cups are provided on the shelf, and the aquatic plants are planted in the transplanting cups. Each shelf is provided with a hanging rack 16 for hooking on the cavity wall of the corresponding experimental cavity. Specifically, the hanging rack includes a vertical rod and an upper hook.

[0030] The setting of the above-mentioned movable partition can be used to explore the influence of the combination of different wetland areas on the performance of multi-stage combined artificial wetlands. In this embodiment, the two experimental cavities in each box have the same volume. In this embodiment, in order to explore the influence of different water levels on the performance of multi-stage combined artificial wetlands, the number of drainage pipes on each box is multiple and is arranged at intervals in the up and down directions. In this embodiment, the influence of different flow rates on the performance of multi-stage combined artificial wetlands can also be explored by controlling the speed of the water flow. Each experimental cavity is filled with a matrix layer, and the matrix layer includes a gravel layer, a volcanic stone layer and a zeolite layer arranged in sequence from bottom to top. Gravel is used as a base material and as a supporting layer at the bottom of the wetland, and volcanic stone and zeolite are used as the main matrix fillers of the wetland system.

[0031] In this embodiment, the sludge required for the start-up of the artificial wetland was taken from the anaerobic tank area of ​​a sewage treatment plant in Zhengzhou City. The sludge concentration is about 6000 mg / L. After the sludge is retrieved, it is aerated for one day to activate the sludge, and then the concentrated sludge is diluted to 300 mg / L with the configured water (C: N: P = 100: 20: 1), and the diluted sludge is added to four artificial wetlands. At the same time, culture water (COD = 100 mg / L, TN = 20 mg / L, TP = 1 mg / L) is introduced, the hydraulic retention time is 2 days, and the wetland startup is considered to be completed after the wetland effluent pollutant concentration stabilizes after continuous operation for 1 month. Plants are an important part of the artificial wetland sewage treatment system. The roots of wetland plants form a network. On the one hand, they absorb some nutrients, adsorb and enrich heavy metals and some toxic and harmful substances, and on the other hand, they provide the necessary place and aerobic and anaerobic conditions for the survival and degradation of nutrients by microorganisms. Iris phellodendri was planted in the artificial wetland at a density of 100 plants / m 2 The simulated wastewater was prepared according to the CW1A standard of the Pollutant Discharge Standard for Urban Wastewater Treatment Plants GB18918-2002. Glucose was used as COD, NH4Cl and NaNO3 were used to provide ammonia nitrogen and nitrate nitrogen, and KH2PO4 was used to provide total phosphorus.

[0032] In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0033] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship 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 position relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0034] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A multi-stage combined artificial wetland simulation experimental device, characterized in that: include The first box is used to simulate a horizontal subsurface flow artificial wetland; the first box has an opening at the upper end, and a first partition and a second partition are sequentially arranged inside the first box to divide the inner cavity of the first box into a first water distribution trough, a first filling cavity and a first water collection trough, and the first partition and the second partition are both provided with connecting holes; a first water inlet pipe is arranged in the first water distribution trough, and the first water collection trough delivers water to the second box through a first drain pipe; The second box is used to simulate the surface flow artificial wetland; the upper end of the second box is open, the outlet of the first drainage pipe is located at one end of the second box, and the second drainage pipe is arranged on the side wall of the other end of the second box; The first filling cavity and the inner cavity of the second box are both provided with shelves for transplanting aquatic plants.

2. The multi-stage combined artificial wetland simulation experimental device according to claim 1 is characterized in that: A first groove is arranged on the cavity wall of the first filling cavity, and a first movable partition is movably inserted and pulled out of the first groove to divide the first filling cavity into at least two experimental cavities.

3. The multi-stage combined artificial wetland simulation experimental device according to claim 1 is characterized in that: A second groove is arranged on the wall of the second box, and a second movable partition is movably inserted and pulled out of the second groove to divide the inner cavity of the second box into at least two experimental cavities.

4. The multi-stage combined artificial wetland simulation experimental device according to claim 1 is characterized in that: A plurality of transplanting cups are arranged on the shelf for transplanting aquatic plants.

5. The multi-stage combined artificial wetland simulation experimental device according to claim 4 is characterized in that: Each of the shelves is provided with a hanging rack for hooking on the cavity wall of the corresponding experimental cavity.

6. The multi-stage combined artificial wetland simulation experimental device according to claim 1 is characterized in that: There are multiple first drainage pipes, which are arranged at intervals in the up-down direction.

7. The multi-stage combined artificial wetland simulation experimental device according to claim 1 is characterized in that: There are multiple second drainage pipes, which are arranged at intervals in the up-down direction.

8. The multi-stage combined artificial wetland simulation experimental device according to claim 1 is characterized in that: The first filling cavity and the inner cavity of the second box body are both filled with a matrix layer.

9. The multi-stage combined artificial wetland simulation experimental device according to claim 8 is characterized in that: The matrix layer comprises a gravel layer, a volcanic rock layer and a zeolite layer which are sequentially arranged from bottom to top.

10. The multi-stage combined artificial wetland simulation experimental device according to claim 1 is characterized in that: The multi-stage combined artificial wetland simulation experimental device also includes a third box and a fourth box. The third box is used to simulate a horizontal subsurface flow artificial wetland. The third box is provided with a second water distribution trough, a second filling chamber and a second water collection trough. The second drain pipe extends into the second water distribution trough. The second water collection trough is connected to the third drain pipe; the third drain pipe is connected to the fourth box. The fourth box is used to simulate a surface flow artificial wetland.

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