Device and method for promoting plant root substance secretion and denitrification in artificial wetlands

Abstract

The present invention relates to the technical field of sewage treatment, and discloses a device for promoting the secretion and denitrification of plant root substances in an artificial wetland, comprising a plurality of hangers, the plurality of hangers are networked in a honeycomb structure to form a connected aquatic plant planting bracket; a cavity is provided in the middle of the hanger; the hanger is in a multi-column structure, and a growth position is provided on each rib surface of the hanger, and a plurality of nozzles are provided along the length direction of the growth position; a pipe for connecting pipes is provided on the top of the hanger; and a rotatable connection part is provided on each rib edge of the hanger. The present invention also provides a method for promoting the secretion and denitrification of plant roots in an artificial wetland. The present invention can enable emergent plants with developed root systems to live in a floating manner in a water area, so that the developed root system directly acts on the water quality, which is convenient for regulating the concentration of rhizosphere secretions and oxygen supply of wetland plants, and is more conducive to promoting the nitrification and denitrification of root microorganisms, and improving the denitrification capacity of artificial wetlands for lake water.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a device and a method for promoting the secretion and denitrification of plant root substances in an artificial wetland. Background Art

[0002] Constructed wetlands are artificial sewage treatment systems that utilize the material cycle and energy flow of plants, microorganisms, and substrates in an ecosystem. Among them, microbial nitrification and denitrification are generally considered to be the most important ways to remove nitrogen from wetlands, with a removal rate of up to 60%-95%. In this process, the concentration and oxygen supply capacity of wetland plant root secretions are crucial factors in promoting nitrification and denitrification of root microorganisms.

[0003] Wetland plant root exudates refer to a series of chemical substances released into the external environment during the normal growth of plants. High molecular weight compounds include mucus, proteins, etc., and low molecular weight organic compounds include amino acids, organic acids, sugars, phenols and secondary metabolites. Amino acids and sugar compounds secreted by roots can be used as chemical attractants to attract the colonization of plant growth promoting bacteria (PGPR). Some species of these PGPR can use tryptophan secreted by roots to synthesize plant growth hormones. Root exudates play an important role in promoting plant growth, nutrient activation, and improving environmental stress.

[0004] However, the root system of phytoplankton is not well developed, and the release of root secretions is limited. Aquatic plants with well-developed root systems are often emergent plants, and their well-developed root systems are located in the soil. This has a great impact on the release of root secretions, resulting in the ability to denitrify water quality being limited. In addition, it is difficult to regulate the release concentration of root secretions through external regulation for roots in the soil.

[0005] To this end, our company has proposed a method that allows emergent plants with well-developed root systems to live in water bodies in a floating manner, making it easier to add carbon sources to the roots and supply oxygen to the roots, and to regulate the concentration of rhizosphere secretions and oxygen supply of wetland plants. It is more beneficial to promote nitrification and denitrification of root microorganisms and improve the denitrification capacity of artificial wetlands for lake water. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and propose a device and method for promoting plant root secretion and denitrification in artificial wetlands. It can make emergent plants with developed root systems live in the water in a floating manner, which is convenient for increasing the concentration and oxygen supply capacity of root secretions to promote nitrification and denitrification of root microorganisms, thereby improving the denitrification capacity of artificial wetlands for lake water.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] An artificial wetland denitrification device for promoting the secretion of plant root substances is designed, comprising a plurality of racks, wherein the racks are networked to form a honeycomb structure and are connected by pipes to form a connected aquatic plant planting bracket; a hollow cavity is provided in the middle of the rack; the rack is in a multi-ribbed column structure, and a growth position for aquatic plant cultivation is provided on each rib surface of the rack, and a plurality of nozzles are provided along the length direction of the growth position, and the nozzles are connected to the cavity; a connecting pipe for connecting the pipe is provided on the top of the rack; and a rotatable connecting part is provided on each rib edge of the rack.

[0009] Furthermore, the growth position is recessed toward one side of the cavity to form a groove, and a clamp corresponding to the groove is provided on the outer side of the growth position. The clamp is connected to the hanger through at least two elastic bands along the length direction, and the elastic band runs through the clamp.

[0010] Furthermore, an embedding groove for limiting the elastic band is provided on the edge of the hanger.

[0011] Furthermore, the connecting pipe is a three-way pipe, one end of which is rotatably connected to the hanger through a rotating connecting seat, and the other two ends are used to connect the pipe fittings.

[0012] Furthermore, the connecting part includes a connecting seat, which is connected to an elastic connecting rod via a connecting block, and a cavity adapted to the connecting block is provided in the connecting seat, and a buckle and a buckle groove are provided at one end of the connecting rod away from the connecting seat, and the buckle and the buckle groove are arranged back to back.

[0013] Furthermore, a float is fixedly provided at the bottom of the hanger.

[0014] The present invention also provides a method for promoting plant root secretion and denitrification by artificial wetlands, using any of the above-mentioned artificial wetland devices for promoting plant root substance secretion and denitrification, specifically comprising the following steps:

[0015] Step 1: On the bank of the artificial wetland, the racks are networked through the connecting parts to form a honeycomb-shaped aquatic plant planting bracket, and the pipes on each rack are connected in series with pipe fittings and connected to the main pipe;

[0016] Step 2: Place the networked aquatic plant planting bracket into the artificial wetland waters. When placing the bracket, select emergent plants with well-developed root systems and fix them on each growth position of the bracket, and insert the nozzle into the root system of the emergent plants.

[0017] After step 3 and step 2 are completed, a floating emergent plant community is formed on the artificial wetland water area. According to the detection of the water area, microbial agents and carbon sources are added to the root parts of the emergent plant community through the main pipe to promote the release of root secretions;

[0018] Step 4: Real-time detection of the oxygen content in the artificial wetland waters. When the oxygen content in the waters is lower than the optimal content for microbial reverse digestion, aeration and oxygen supply are performed to the root areas of the emergent plants through the main pipe.

[0019] The present invention proposes a device and method for promoting the secretion and denitrification of plant root substances in an artificial wetland, and the beneficial effects are: the present invention can enable emergent plants with well-developed root systems to live in water areas in a floating manner, so that the well-developed root systems can directly act on the water quality, which is convenient for adding carbon sources to the root systems and supplying oxygen to the root systems, and is convenient for regulating the concentration of rhizosphere secretions and oxygen supply of wetland plants, which is more conducive to promoting nitrification and denitrification of root microorganisms, and improving the denitrification capacity of artificial wetlands for lake water.

[0020] (1) The present invention sets aquatic plant planting brackets in the artificial wetland water area, so that emergent plants with well-developed root systems can live in the artificial wetland water area in a floating manner. By adding carbon sources to the root system to adjust the carbon-nitrogen ratio and supply oxygen to the root system, the release of root secretions of emergent plants is promoted. By regulating the concentration and oxygen supply capacity of rhizosphere secretions of wetland plants, the nitrification and denitrification of rhizosphere microorganisms are promoted, thereby improving the denitrification capacity of artificial wetlands for lake water.

[0021] (2) The present invention adopts emergent plants with well-developed root systems to live in the water in a floating form, so that the roots are directly in the water, increasing the attachment surface of microorganisms. On the one hand, it is beneficial to add microbial agents and promote the secretion of root microorganisms. On the other hand, it is also convenient to supplement carbon sources, increase the carbon-nitrogen ratio, and promote the release of root secretions. At the same time, it is also convenient to aerate and oxygenate the plant roots, which is beneficial to the digestion reaction of microorganisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the rack in the present invention;

[0024] Figure 2 It is a schematic diagram of a half-section structure of a rack in the present invention;

[0025] Figure 3 yes Figure 2 An enlarged schematic diagram of point A in FIG.

[0026] Figure 4 It is a top view of the rack in the present invention;

[0027] Figure 5It is a schematic diagram of the structure of the aquatic plant planting bracket formed after the racks are networked in the present invention;

[0028] Markings in the figure are: 1. hanger, 11. groove, 12. growth position, 13. cavity, 14. rotating connecting seat, 15. connecting pipe, 16. nozzle, 17. splint, 18. elastic band, 19. float, 111. connecting seat, 112. connecting rod, 113. buckle, 114, buckle groove, 115, connecting block; 2. pipe fittings; 3. aquatic plants. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "inside", "outside", "top / bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The structural features of the present invention are now described in detail with reference to the accompanying drawings.

[0033] Example 1

[0034] See also Figure 5, a device for promoting the secretion and denitrification of plant root substances in an artificial wetland, comprising a plurality of racks 1. In order to better adapt to the harsh environment of artificial wetlands, the racks 1 are made of engineering weather-resistant plastic. The plurality of racks 1 are networked in a honeycomb structure and are connected by pipes 2 to form a connected aquatic plant planting bracket. Since the aquatic plant planting bracket adopts a honeycomb structure, after aquatic plants 3 are planted on the aquatic plant planting bracket, an aquatic plant group floating on the water surface can be formed. In order to highlight the roots of aquatic plants, emergent plants with developed root systems should be used as aquatic plants 3. The emergent plants include reeds, cattails, water chestnuts, lotus, water celery, wild rice stem, cattails, etc.

[0035] See also Figure 1-2 A hollow cavity 13 is provided in the middle of the hanger 1, and the hanger 1 is a multi-column structure. A growth position 12 for cultivating aquatic plants is provided on each rib surface of the hanger 1. The growth position 12 is recessed toward one side of the cavity 13 to form a groove. A splint 17 corresponding to the groove is provided on the outer side of the growth position 12. The splint 17 is connected to the hanger 1 along the length direction by at least two elastic bands 18. The elastic band 18 runs through the splint 17. An embedding groove 11 for limiting the elastic band 18 is provided on the rib edge of the hanger 1. The aquatic plant seedlings can be fixed on the growth position 12 in a clamping manner by the splint 17. Since the splint 17 is fixed in a manner of the elastic band 18, on the one hand, it is convenient for the cultivation of aquatic plant seedlings, and on the other hand, it will not cause the growth of the aquatic plant seedlings to be trapped.

[0036] See also Figure 1-2 and 4. a plurality of nozzles 16 are provided along the length direction of the growth position 12, and the nozzles 16 are connected to the cavity 13. when the aquatic plant seedlings are cultivated to the growth position 12, it is necessary to make the roots of the seedlings correspond to the position of the nozzles 16, so that the nozzles 16 are inserted into the root system of the aquatic plant seedlings. the purpose of setting the nozzles 16 is, on the one hand, to more accurately add microbial agents, carbon sources and oxygen to the roots of aquatic plants, and on the other hand, to play a role in limiting the position of aquatic plants.

[0037] See also Figure 1-2 A connecting pipe 15 for connecting the pipe fitting 2 is provided at the top of the hanger 1. The connecting pipe 15 is a three-way pipe, one end of which is rotatably connected to the hanger 1 through a rotating connecting seat 14, and the other two ends are used to connect the pipe fitting 2. The connecting pipe 15 can be rotated arbitrarily on the top of the hanger 1 to facilitate adjustment of the docking direction with the pipe fitting 2. A sealing ring is provided in the rotating connecting seat 14 to ensure the sealing of the cavity 13.

[0038] See also Figure 3The hanger 1 is provided with a rotatable connection part on each edge, and the connection part includes a connection seat 111, and the connection seat 111 is connected to the elastic connecting rod 112 through a connecting block 115. A cavity adapted to the connecting block 115 is provided in the connection seat 111, and the connecting block 115 can be rotated on the connection seat 111. A buckle 113 and a buckle groove 114 are provided at one end of the connecting rod 112 away from the connection seat 111, and the buckle 113 and the buckle groove 114 are arranged opposite to each other. When the connection parts on two hangers 1 are connected, the buckles 113 and the buckle grooves 114 on the connection parts are staggered and connected with each other, thereby realizing the connection and networking of the hangers 1, and the operation is convenient.

[0039] See also Figure 1-2 A float 19 is fixedly arranged at the bottom of the rack 1, and the float 19 is made of foam, which plays a role of suspension support for the entire rack 1 and the aquatic plants cultivated on the rack 1. The aquatic plant planting bracket can float in the water area of ​​the artificial wetland in a suspended manner.

[0040] Example 2

[0041] The present invention also provides a method for promoting plant root secretion and denitrification by artificial wetlands, and a device for promoting plant root substance secretion and denitrification by artificial wetlands, which specifically comprises the following steps:

[0042] Step 1. On the bank of the artificial wetland, the racks 1 are networked through the connecting parts to form a honeycomb-shaped aquatic plant planting bracket, and the pipes 15 on each rack 1 are connected in series with each other using pipe fittings 2, and connected to the main pipe. The main pipe is externally connected to a liquid supply pump and an aeration pump. The liquid supply pump supplies two liquids, one is a carbon source solution, which is a mixed solution of sugars and organic acids. The purpose is to add a carbon source to the roots of aquatic plants and adjust the carbon-nitrogen ratio. The other is a microbial agent solution. The purpose is to add microbial agents to the roots of aquatic plants. The aeration pump supplies air to provide oxygen to the roots of aquatic plants.

[0043] Step 2: Place the networked aquatic plant planting bracket into the artificial wetland waters. At the same time, select emergent plants with well-developed root systems and fix them on each growth position 12 of the bracket 1, and insert the nozzle 16 into the root system of the emergent plants. The purpose of setting the nozzle 16 is to more accurately supplement the roots of aquatic plants with microbial agents, carbon sources and oxygen.

[0044] After step 3 and step 2 are completed, a floating emergent plant community is formed in the artificial wetland water area. According to the detection of the water area, microbial agents and carbon sources are added to the root system of the emergent plant community through the main pipe to promote the release of root secretions. When the microbial agents and carbon sources are added, the added solution is sent to the cavity 13 of each hanger 1 by the pipe 2, and then directly added to the root system of the aquatic plants from the cavity 13 through the nozzle 16.

[0045] Step 4: Real-time detection of the oxygen content in the artificial wetland waters. When the oxygen content in the waters is lower than the optimal content for microbial reverse digestion, aeration and oxygen supply are performed to the root system of the emergent plant community through the main pipe. The oxygen supply is also carried out by sending air to the cavity 13 of each hanger 1 through the pipe 2, and then the air is directly added to the root system of the aquatic plants through the cavity 13 through the nozzle 16.

[0046] The device and method for promoting the secretion and denitrification of plant root substances in artificial wetlands of the present invention can enable emergent plants with well-developed root systems to live in water areas in a floating manner, allowing the well-developed root systems to directly act on the water quality, making it convenient to add carbon sources to the root systems and supply oxygen to the root systems, facilitating the regulation of the concentration of rhizosphere secretions and oxygen supply of wetland plants, and more conducive to promoting the nitrification and denitrification of root microorganisms, thereby improving the denitrification capacity of artificial wetlands for lake water.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for promoting the secretion and denitrification of plant root substances in an artificial wetland, comprising a plurality of racks (1), characterized in that: A plurality of the hangers (1) are networked to form a honeycomb structure, and are connected to each other via pipes (2) to form interconnected aquatic plant planting brackets; A hollow cavity (13) is provided in the middle of the hanger (1); The rack (1) is in a multi-column structure, and each rib of the rack (1) is provided with a growth position (12) for cultivating aquatic plants, and the growth position (12) is provided with a plurality of nozzles (16) along the length direction, and the nozzles (16) are connected to the cavity (13); A connecting pipe (15) for connecting the pipe fitting (2) is provided on the top of the hanging bracket (1); The hanger (1) is provided with a rotatable connection portion on each edge.

2. The device for promoting the secretion and denitrification of plant root substances in artificial wetlands according to claim 1, characterized in that: The growth position (12) is recessed on one side facing the cavity (13) to form a groove, and a clamping plate (17) corresponding to the groove is provided on the outer side of the growth position (12), and the clamping plate (17) is connected to the hanger (1) along the length direction via at least two elastic bands (18), and the elastic bands (18) penetrate the clamping plate (17).

3. The device for promoting the secretion and denitrification of plant root substances in artificial wetlands according to claim 2, characterized in that: The edge of the hanger (1) is provided with an embedding groove (11) for limiting the position of the elastic band (18).

4. The device for promoting the secretion and denitrification of plant root substances in artificial wetlands according to claim 1, characterized in that: The connecting pipe (15) is a three-way pipe, one end of which is rotatably connected to the hanger (1) via a rotating connection seat (14), and the other two ends are used to connect to the pipe fitting (2).

5. The device for promoting the secretion and denitrification of plant root substances in artificial wetlands according to claim 1, characterized in that: The connecting portion comprises a connecting seat (111), the connecting seat (111) being connected to an elastic connecting rod (112) via a connecting block (115), a cavity matching the connecting block (115) being provided in the connecting seat (111), a buckle (113) and a buckle groove (114) being provided at one end of the connecting rod (112) away from the connecting seat (111), the buckle (113) and the buckle groove (114) being arranged opposite to each other.

6. The device for promoting the secretion and denitrification of plant root substances in artificial wetlands according to claim 1, characterized in that: A floating body (19) is fixedly provided at the bottom of the hanger (1).

7. A method for promoting plant root secretion and denitrification in artificial wetlands, using the device for promoting plant root secretion and denitrification in artificial wetlands as claimed in any one of claims 1 to 6, characterized in that: The specific steps include: Step 1: On the bank of the artificial wetland, the racks (1) are networked through the connecting parts to form a honeycomb-shaped aquatic plant planting bracket, and the pipes (15) on each rack (1) are connected in series with each other using pipe fittings (2) and connected to the main pipe; Step 2, placing the networked aquatic plant planting bracket into the artificial wetland waters, and while placing the bracket, selecting emergent plants with well-developed root systems to be fixed on each growth position (12) of the bracket (1), and inserting the nozzle (16) into the root system of the emergent plants; After step 3 and step 2 are completed, a floating emergent plant community is formed on the artificial wetland water area. According to the detection of the water area, microbial agents and carbon sources are added to the root parts of the emergent plant community through the main pipe to promote the release of root secretions; Step 4: Real-time detection of the oxygen content in the artificial wetland waters. When the oxygen content in the waters is lower than the optimal content for microbial reverse digestion, aeration and oxygen supply are performed to the root areas of the emergent plants through the main pipe.

Images