Microorganism enhanced submerged plant blanket

Abstract

The utility model relates to the technical field of water body ecological restoration, and discloses a microorganism enhanced submerged plant blanket. The layer structure comprises a substrate layer, plant fiber layers arranged on the upper side and the lower side of the substrate layer, and a plant fiber net arranged on the outer side of the plant fiber layer on the upper side of the substrate layer. Wherein a slow-release carbon source is mixed in the substrate layer to form a nutrient layer, and a granular immobilized microbial agent is arranged above the substrate layer to form a microbial agent layer. The submerged plant blanket is simple and reasonable in structure, the fixing force of the submerged plants and the fungicide is high, nutrients can be continuously provided for the planted submerged plants through the slow-release carbon source, the removal capacity of the plant blanket on ammonia nitrogen pollutants in water can be improved through immobilized microorganisms, and efficient purification and degradation of pollution loads are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of water body ecological restoration, and in particular to a novel microbial enhanced submerged plant blanket. Background Art

[0002] Submerged plants refer to large aquatic plants whose entire plant body is located below the water layer and survives fixedly. Their roots are sometimes underdeveloped or degenerate, and their leaves are mostly ribbon-shaped or filamentous. All parts of the plant body can absorb water and nutrients, and their aerenchyma is particularly developed, which is conducive to gas exchange in the absence of air in the water. Studies have shown that submerged plants have ecological functions such as directly absorbing nutrients from water bodies, reducing water turbidity, adsorbing and absorbing heavy metals, inhibiting algae growth, and symbiotically coexisting with microorganisms and aquatic animals. The use of submerged plants to repair damaged water bodies such as eutrophic water bodies has also been widely used.

[0003] Adding selected exogenous microorganisms to the water environment can increase the metabolic activity of water microorganisms and the degradation rate of pollutants, but during use, the microbial agents have problems such as easy loss, difficult recovery, and poor stress resistance. Microbial immobilization can effectively increase the concentration of microbial agents and their resistance to toxicity and environmental shocks, help improve the utilization efficiency and recyclability of microbial agents, and can also be combined with other common water environment purification processes or equipment to improve purification efficiency.

[0004] At present, most urban rivers have flood control and drainage functions. The flow rate of rivers is relatively high during the flood season, and most of them are hard-bottomed rivers, so submerged plants cannot be planted, and the effect of adding microbial agents is poor. The inventor of this application noticed that some literature has studied the planting of submerged plants in hard rivers, but the structure of the device is complex and the materials used are difficult to degrade. If applied to the river, it may cause secondary impacts on the river environment; in addition, immobilized microbial agent products are mostly independently set up facilities, which increase the floor space and management and maintenance costs. Summary of the invention

[0005] According to one embodiment of the present application, the purpose is to provide a new type of microbial enhanced submerged plant blanket with a simple and reasonable structure. By combining the submerged plant blanket with an immobilized microbial agent, the fixation performance of the submerged plants and the agent is improved, and the survival rate of the submerged plants is improved.

[0006] The above purpose can be achieved by implementing the following technical solutions:

[0007] According to one aspect of the present application, the present application provides a new type of microbial enhanced submerged plant blanket, in which submerged plants are planted, and the layer structure of the new type of microbial enhanced submerged plant blanket includes: a matrix layer, a plant fiber layer arranged on the upper and lower sides of the matrix layer, and a plant fiber net arranged on the outside of the plant fiber layer on the upper side of the matrix layer; wherein a slow-release carbon source is mixed in the matrix layer to form a nutrient layer, and a granular immobilized microbial agent is arranged above the matrix layer to form an agent layer.

[0008] Optionally, the nutrient layer is located in the middle of the substrate layer.

[0009] Optionally, a plant fiber net is further provided on the outer side of the plant fiber layer on the lower side of the matrix layer.

[0010] Optionally, the thickness of the matrix layer is 20 to 30 mm, the thickness of the plant fiber layer is 5 to 10 mm, and the thickness of the plant fiber net is 5 to 10 mm.

[0011] Optionally, the pore size of the plant fiber layer is 0.1-5 mm.

[0012] Optionally, the pore size of the plant fiber net is 20 to 50 mm.

[0013] Optionally, the plant fiber layer and the plant fiber net are both woven from one or more of coconut fiber, wheat straw and hemp plant fiber.

[0014] Optionally, the soil of the substrate layer is taken from a river bank slope.

[0015] Optionally, the slow-release carbon source is crushed dry plant stems and leaves.

[0016] Optionally, the strains of the immobilized microbial agent are nitrifying bacteria and denitrifying bacteria.

[0017] Optionally, the planting density of the submerged plants is 120 to 600 plants / m 2 .

[0018] Beneficial effects: An embodiment of the present application provides a novel microorganism-enhanced submerged plant blanket, whose layer structure includes a matrix layer, a plant fiber layer and a plant fiber net. The plant fiber layers arranged on the upper and lower sides of the matrix layer are used to support the matrix layer and shape the plant blanket; the plant fiber net arranged on the outside of the upper plant fiber layer is used to fix the submerged plants; the main body of the matrix layer is soil suitable for the growth of submerged plants. The present application mixes a slow-release carbon source in the matrix layer to form a nutrient layer, thereby sustainably providing nutrients for the planted submerged plants, and a granular immobilized microbial agent is arranged above the matrix layer, such as the top, which can improve the plant blanket's ability to remove ammonia nitrogen pollutants in the water body through immobilized microorganisms, thereby achieving efficient purification and degradation of pollution loads.

[0019] Compared with the prior art, the novel microbial enhanced submerged plant blanket of the present application also has the following advantages:

[0020] 1. The structure of the submerged plant blanket of the present application is simple and reasonable. Plant fiber layers are arranged on the upper and lower sides of the substrate layer, and a plant fiber net is arranged on the outer side of the upper plant fiber layer, which improves the fixation performance of the submerged plants. The immobilized microbial agent is arranged above the substrate layer and under the plant fiber layer, which improves the fixation performance of the agent.

[0021] 2. This application improves the survival rate of submerged plants by adding a slow-release carbon source and soil rich in organic matter to the matrix layer. It is particularly suitable for urban rivers with hard bases and high flow rates during flood control.

[0022] 3. In this application, immobilized bacterial agent particles with nitrifying bacteria and denitrifying bacteria are added above the substrate layer. In the low dissolved oxygen environment at the bottom of the river, nitrifying bacteria and denitrifying bacteria can coexist, and ammonia nitrogen in the water environment can be degraded into nitrogen gas, further improving the removal efficiency of ammonia nitrogen in the water body. In addition, during use, nitrifying bacteria and denitrifying bacteria will slowly escape into the water body, gradually improving the microbial structure in the water body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a novel microbial enhanced submerged plant blanket planted with submerged plants in one embodiment of the present application;

[0024] Figure 2 It is a schematic diagram of the layer structure of a novel microbial enhanced submerged plant blanket according to an embodiment of the present application.

[0025] Figure numerals: 1-matrix layer; 2-plant fiber layer; 3-plant fiber net; 4-submerged plants; 5-slow-release carbon source; 6-immobilized microbial agent. DETAILED DESCRIPTION

[0026] The technical solution of the present application will be clearly and completely described below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0027] Example

[0028] Figure 1 and Figure 2 The structure of a novel microorganism-enhanced submerged plant blanket provided in this embodiment is schematically shown.

[0029] like Figure 1 As shown, a new type of microorganism-enhanced submerged plant blanket provided in this embodiment includes a matrix layer 1, a plant fiber layer 2 and a plant fiber net 3. Among them, plant fiber layers 2 are arranged on the upper and lower sides of the matrix layer to support the matrix layer and the shaped plant blanket, so as to facilitate the transportation of the plant blanket. In this embodiment, a plant fiber net 3 is also arranged on the outer side of the upper plant fiber layer to fix the submerged plants 4. In this embodiment, the two structures of the plant fiber layer 2 and the plant fiber net 3 ensure the fixation of the submerged plants in a high flow rate environment, thereby preventing the submerged plants from being washed away due to river flood control.

[0030] In addition, generally, the thickness of the matrix layer can be 20-30 mm, for example, 25 mm. The thickness of the plant fiber layer can be 5-10 mm, for example, 7 mm. The thickness of the plant fiber net can be 5-10 mm, for example, 6 mm. Further, the plant fiber layer and the plant fiber net can be woven by one or more combinations of coconut fiber, wheat straw and hemp plant fiber. In addition, the pore size of the plant fiber layer is 0.1-5 mm. The pore size of the plant fiber net is 20-50 mm. By controlling the pore size of the plant fiber layer 2 and / or the plant fiber net 3, the fixation of submerged plants can be further improved.

[0031] The main body of the matrix layer of the submerged plant blanket in the present application is soil suitable for the growth of submerged plants. The soil in this embodiment is taken from the river bank slope and is used to plant submerged plants to improve the survival rate of submerged plants in hard rivers or rivers with polluted bottom mud.

[0032] like Figure 2As shown, a slow-release carbon source 5 is also mixed into the soil of the substrate layer to form a nutrient layer. The slow-release carbon source 5 can be selected from crushed dry plant stems and leaves to provide nutrients and trace elements required for the growth of aquatic plants, and to a certain extent can improve the structural strength of the plant blanket. In addition, as shown in the figure, it can be arranged in the middle of the substrate layer.

[0033] In addition, granular immobilized microbial agents 6 are evenly arranged on the upper layer of the matrix layer to form an agent layer, and Figure 2 The immobilized microbial agent 6 is shown to be located below the plant fiber layer 2, and the fixation of the agent is improved by arranging it in the matrix layer. Preferably, the species of the immobilized microbial agent are nitrifying bacteria and denitrifying bacteria. In the low dissolved oxygen environment at the bottom of the river, nitrifying bacteria and denitrifying bacteria can coexist in the same area. Nitrifying bacteria absorb ammonia nitrogen in the water body and degrade it into nitrate nitrogen. Denitrifying bacteria can further degrade nitrate nitrogen into nitrogen gas, thereby achieving effective degradation of ammonia nitrogen in the river.

[0034] In addition, in this application, submerged plants can be planted at 120-600 plants / m 2 The planting density is planted in a new type of microbial enhanced submerged plant blanket. Figure 1 and 2 As shown, submerged plants are planted in the substrate layer, and the roots of the submerged plants are penetrated by the plant fiber net to the outside of the lower plant fiber layer. In addition, optionally, a plant fiber net can also be arranged on the outside of the plant fiber layer on the lower side of the substrate layer to further improve the fixation.

[0035] In summary, the new type of microbial enhanced submerged plant blanket provided in the present application combines the submerged plant blanket with immobilized microbial agents, and by improving and optimizing its layer structure, the fixation performance of the submerged plants and the agents can be improved, the survival rate of the submerged plants can be improved, nutrients can be continuously provided to the planted submerged plants through the slow-release carbon source in the matrix layer, and the ability of the plant blanket to remove ammonia nitrogen pollutants in the water body can be improved.

[0036] The description of the present application is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present application to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present application, and to enable those of ordinary skill in the art to understand the present application and design various embodiments with various modifications suitable for specific purposes. Where the present application is not described in detail, it is a known technology to those of ordinary skill in the art.

Claims

1. A microbial enhanced submerged plant blanket, in which submerged plants are planted, characterized in that: The layer structure of the microbial enhanced submerged plant blanket includes: a matrix layer, a plant fiber layer arranged on the upper and lower sides of the matrix layer, and a plant fiber net arranged on the outer side of the plant fiber layer on the upper side of the matrix layer; wherein a slow-release carbon source is mixed in the matrix layer to form a nutrient layer, and a granular immobilized microbial agent is arranged above the matrix layer to form an agent layer.

2. The microbial enhanced submerged plant blanket according to claim 1, characterized in that: The nutrient layer is located in the middle of the substrate layer; A plant fiber net is also arranged on the outer side of the plant fiber layer at the lower side of the matrix layer.

3. The microbial enhanced submerged plant blanket according to claim 1, characterized in that: The thickness of the matrix layer is 20-30 mm, the thickness of the plant fiber layer is 5-10 mm, and the thickness of the plant fiber net is 5-10 mm.

4. The microbial enhanced submerged plant blanket according to claim 1, characterized in that: The pore size of the plant fiber layer is 0.1-5 mm.

5. The microbial enhanced submerged plant blanket according to claim 1, characterized in that: The pore size of the plant fiber net is 20 to 50 mm.

6. The microbial enhanced submerged plant blanket according to claim 1, characterized in that: The plant fiber layer and the plant fiber net are both woven from one or more of coconut fiber, wheat straw and hemp plant fiber.

7. The microbial enhanced submerged plant blanket according to claim 1, characterized in that: The soil of the matrix layer is taken from the river bank slope.

8. The microbial enhanced submerged plant blanket according to claim 1, characterized in that: The slow-release carbon source is crushed dry plant stems and leaves.

9. The microbial enhanced submerged plant blanket according to claim 1, characterized in that: The strains of the immobilized microbial agent are nitrifying bacteria and denitrifying bacteria.

10. The microbial enhanced submerged plant blanket according to claim 1, characterized in that: The planting density of the submerged plants is 120 to 600 plants / m 2 .

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