Aquatic plant-microorganism combined bottom mud remediation reactor

Abstract

The utility model discloses an aquatic plant-microorganism combined bottom mud remediation reactor, which belongs to the technical field of sludge treatment and comprises an ecological cylinder, bottom mud is laid at the bottom of the ecological cylinder and used for planting aquatic plants, overlying water is added into the ecological cylinder, and an adding fixing device is inserted into the top of the bottom mud. The bottom of the adding fixing device is communicated with the interior of the bottom mud through an opening, the top of the adding fixing device penetrates through overlying water to be communicated with the outside, and the adding fixing device is used for adding microbial agents; the ecological cylinder is further provided with a water flow simulation device used for simulating water flow. According to the aquatic plant-microorganism combined in-situ remediation system, an aquatic plant-microorganism combined in-situ remediation scheme with the highest cost performance can be obtained through low economic investment, and a better effect is achieved with low operation cost and maintenance cost.

Description

Technical Field

[0001] This utility model belongs to the field of sludge treatment technology, and in particular relates to an aquatic plant-microorganism combined sediment remediation reactor. Background Technology

[0002] Current methods for remediating contaminated sediment in my country can be categorized into physical, chemical, and biological remediation. Physical methods primarily involve large-scale machinery or the construction of sewage treatment projects. These methods are quick to take effect, but require extensive engineering work, are costly, and their remediation effects are not sustainable. Chemical methods mainly involve introducing chemical agents into the water body and sediment to improve water quality. This method can improve water quality in a short period, reducing the levels of pollutants such as nitrogen, phosphorus, and organic matter. However, this method has significant side effects on water quality, impacting the survival of aquatic organisms.

[0003] In-situ bioremediation is currently the most commonly used technology for remediating bottom sediments in polluted water bodies, including microbial remediation and phytoremediation. Biological methods require less investment and energy consumption, have low operating costs, are environmentally friendly, offer excellent treatment results, produce no secondary pollution, and are aesthetically pleasing.

[0004] However, there are many types and high concentrations of pollutants in water bodies and sediments. Traditional biological treatment methods have a certain effect on the bioremediation of water bodies and sediments, but they often have problems such as low removal efficiency of certain pollutants and large amounts of residues, making it difficult to accurately find the most suitable remediation solution.

[0005] To obtain the most cost-effective remediation solution with less economic investment and achieve better results with lower operating and maintenance costs, an aquatic plant-microorganism combined sediment remediation reactor is proposed. Utility Model Content

[0006] To address the aforementioned technical problems, this invention proposes a combined aquatic plant-microorganism sediment remediation reactor.

[0007] To achieve the above objectives, this utility model provides an aquatic plant-microorganism combined sediment remediation reactor, comprising: an ecological tank, wherein the bottom of the ecological tank is covered with sediment for planting aquatic plants, and an overlying water is added to the ecological tank; a dosing and fixing device is inserted into the top of the sediment, the bottom of the dosing and fixing device is open to connect to the interior of the sediment, and the top of the dosing and fixing device is connected to the outside through the overlying water; the dosing and fixing device is used to add microbial agents; the ecological tank is also equipped with a water flow simulation device for simulating water flow.

[0008] According to the aquatic plant-microorganism combined sediment remediation reactor provided by this utility model, the addition and fixing device is a cylindrical tube.

[0009] According to the aquatic plant-microorganism combined sediment remediation reactor provided by this utility model, the water flow simulation device includes a circulating water pump, the top of the ecological tank is provided with a water inlet and the bottom is provided with a water outlet, one end of the circulating water pump is connected to the water inlet through a pipeline and the other end is connected to the water outlet through a pipeline.

[0010] According to the aquatic plant-microorganism combined sediment remediation reactor provided by this utility model, the circulating water pump has multiple speeds.

[0011] According to the aquatic plant-microorganism combined sediment remediation reactor provided by this utility model, the addition and fixing device is made of biodegradable material.

[0012] According to the aquatic plant-microorganism combined sediment remediation reactor provided by this utility model, the ecological tank has a size of 40*40*60 cm.

[0013] Compared with the prior art, the present invention has the following advantages and technical effects:

[0014] Substrate sediment is added to the ecological tank, aquatic plants are planted on the sediment, and then a dosing and fixing device is inserted. Microbial agents are added to the dosing and fixing device, and then top water is added to the ecological tank. A water flow simulation device can simulate water flow. This aquatic plant-microorganism combined in-situ remediation reactor can simulate the operation of a natural ecosystem. By adjusting the ratio of aquatic plants to various solidified microorganisms, the most cost-effective remediation solution can be found and then applied to actual water body sludge. It can achieve better results with lower operating and maintenance costs. When treating polluted water body sediment, aquatic plants and added microorganisms work synergistically while adsorbing and treating pollutants. Submerged plants and microorganisms provide nutrients to each other, greatly improving the pollutant removal efficiency. It has a wide range of applications in water bodies.

[0015] The fixed dosing device facilitates timely replenishment or removal of bacterial agents, and can also be used to deliver gas into the bottom sediment, providing better aquatic environmental conditions. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of the aquatic plant-microorganism combined sediment remediation reactor of this utility model.

[0018] In the picture: 1. Ecological tank; 2. Addition and fixing device; 3. Top water; 4. Bottom mud; 5. Aquatic plants; 6. Circulating water pump; 7. Water inlet; 8. Water outlet. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Existing technologies utilize aquatic plant-microorganism combined in-situ remediation methods for water environment restoration. Taking an in-situ remediation method for cadmium-contaminated sediment as an example, it includes the following steps:

[0021] 1) Treating aquatic plant seeds;

[0022] 2) Add AMF inoculum to the rhizosphere of aquatic plants to form mycorrhizal seedlings;

[0023] 3) Plant mycorrhizal seedlings in cadmium-containing sediment and add PGPR bacteria.

[0024] Preferably, the aquatic plant is selected from reeds.

[0025] Preferably, the planting density of the aquatic plants is 90 plants / m². 2 .

[0026] Preferably, the step of treating aquatic plant seeds in step 1) includes: soaking and disinfecting reed seeds with 10% H2O2 and then drying them on filter paper.

[0027] Preferably, the AMF strains are *Acaulospora bireticulata* and *Funneliformis mosseae*.

[0028] Preferably, the PGPR bacteria are Serratia marcescens.

[0029] Preferably, after the aquatic plants sprout from the rhizosphere in step 2), an AMF inoculation test is conducted, in which 30g of fungal agent is added to the culture medium and mycorrhizal seedlings are cultured.

[0030] Preferably, in step 3), the aquatic plant seedlings are transplanted or propagated in cadmium-containing sediment, and 15 mL of PGPR bacteria are added. The ratio of the thickness of the cadmium-containing sediment to the depth of the overlying water is 1:3 to 1:4.

[0031] Preferably, the cadmium content in the cadmium-containing sediment is 1.5-2 mg / kg. -1 .

[0032] This in-situ remediation method utilizes AMF and PGPR bacteria in conjunction with aquatic plants to absorb phosphorus from the water and remediate cadmium (heavy metal) contaminated sediment. On one hand, AMF promotes the colonization of PGPR in the root zone of aquatic plants and within their roots, while PGPR promotes AMF infection and development, increasing its infection rate, vesicle number, and spore number. On the other hand, it promotes the absorption of heavy metals (Cd, Zn, Pb, Cu) from the sediment and phosphorus from the water by the roots of aquatic plants, reducing the content of heavy metals and nutrients in the sediment. The method is scientifically sound and reasonable.

[0033] The method of this invention can adsorb cadmium and prevent the release and transfer of cadmium in sediment, thus exhibiting excellent remediation effects on cadmium-contaminated sediment. Furthermore, it offers good remediation results, low cost, ease of management, and no secondary pollution, making it a promising candidate for widespread application. Further, the mycorrhizae formed by the aquatic plants and fungi in this invention represent a mutually beneficial symbiotic association formed through long-term co-evolution between plants and mycorrhizal fungi. Mycorrhizae not only enhance the plant's resistance to adverse environments and promote plant growth but also provide ample nutrients for the survival of mycorrhizal fungi, making them excellent cadmium-accumulating plants. AMF strains can widely establish symbiotic relationships with plant rhizospheres, improving the host plant's heavy metal tolerance. PGPR strains can combine with plants to enhance the remediation effect of heavy metal pollution through nitrogen fixation and phosphorus dissolution.

[0034] The in-situ remediation method for cadmium-contaminated sediment of this invention utilizes the combined remediation of microorganisms and aquatic plants, which overcomes the shortcomings of traditional phytoremediation methods such as low biomass, slow growth, and long remediation cycle. The mutual promotion between microorganisms and aquatic plants can achieve a good remediation effect, which is of great significance for the remediation of cadmium-contaminated sediment.

[0035] This is a specific application of the combined in-situ remediation of polluted water body sediment using aquatic plants and microorganisms. However, to achieve the best cost-effectiveness in the selection of aquatic plant species and planting density, the ratio of sediment thickness to overlying water depth, the selection of bacterial solution, the frequency of addition, and the amount added, multiple experiments are required. It is not practical to directly release the solution into large water bodies such as rivers and lakes each time, as the amount of investment would be too large for experiments. Therefore, this application proposes an aquatic plant-microorganism combined in-situ remediation reactor for treating polluted water body sediment.

[0036] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Reference Figure 1As shown, this embodiment provides an aquatic plant-microorganism combined sediment remediation reactor, including: an ecological tank 1, with sediment 4 laid at the bottom of the ecological tank 1, the sediment 4 being used to plant aquatic plants 5, and an overlying water 3 added to the ecological tank 1. A dosing and fixing device 2 is inserted into the top of the sediment 4, with an opening at the bottom of the dosing and fixing device 2 connecting to the interior of the sediment 4, and the top of the dosing and fixing device 2 penetrating the overlying water 3 to connect to the outside. The dosing and fixing device 2 is used to add microbial agents; the ecological tank 1 is also equipped with a water flow simulation device to simulate water flow.

[0038] Bottom sediment 4 is added to the ecological tank 1, and aquatic plants 5 are planted on the bottom sediment 4. Then, a dosing and fixing device 2 is inserted, and microbial inoculants are added into the dosing and fixing device 2. Topwater 3 is then added to the ecological tank 1. A water flow simulation device can simulate water flow. This aquatic plant-microorganism combined in-situ remediation reactor can simulate the operation of a natural ecosystem. By adjusting the ratio of aquatic plants 5 to various solidified microorganisms, the most cost-effective remediation solution can be found and applied to actual water body sludge. It can achieve better results with lower operating and maintenance costs. When treating polluted water body bottom sediment 4, the aquatic plants 5 and the added microorganisms work synergistically while adsorbing and treating pollutants. This allows the submerged plants and microorganisms to provide nutrients to each other, greatly improving the pollutant removal efficiency. It has a wide range of applications in water bodies.

[0039] The dosing and fixing device 2 facilitates timely replenishment or removal of the bacterial agent, and can also be used to deliver gas into the bottom sediment 4 to provide better aquatic environmental conditions.

[0040] This embodiment provides an aquatic plant-microorganism combined sediment remediation reactor, and the addition fixing device 2 is a cylindrical tube.

[0041] This embodiment provides an aquatic plant-microorganism combined sediment remediation reactor. The water flow simulation device includes a circulating water pump 6, an inlet 7 at the top of the ecological tank 1, and an outlet 8 at the bottom. One end of the circulating water pump 6 is connected to the inlet 7 through a pipeline, and the other end is connected to the outlet 8 through a pipeline.

[0042] The circulating water pump 6 circulates the water, which is beneficial for the timely circulation of oxygen production by plants and aerobic metabolism of microorganisms, and also improves the looseness and aeration of the bottom sediment 4.

[0043] This embodiment provides an aquatic plant-microorganism combined sediment remediation reactor, and the circulating water pump 6 has multiple speed settings.

[0044] The multi-speed water pump can simulate various water flow conditions, including different flow rates and pollution levels in rivers. Based on this, appropriate aquatic plants and microbial agents can be selected to ensure the best restoration effect.

[0045] This embodiment provides an aquatic plant-microorganism combined sediment remediation reactor, wherein the addition and fixing device 2 is made of biodegradable material.

[0046] The materials used in the remediation reactor are biodegradable, will not cause secondary pollution, can treat polluted water bodies with various bottom sediments, and have a wide range of applications.

[0047] This embodiment provides an aquatic plant-microorganism combined sediment remediation reactor, with the ecological tank 1 measuring 40*40*60 cm.

[0048] Ecological tank 1 has a moderate size and relatively balanced proportions. Its width and length are relatively close, making it easier to maintain stability and reducing the risk of tipping over. It also provides a relatively wide field of vision on the water surface, making it convenient for observation and operation.

[0049] Any aspects of this utility model that are not detailed herein are conventional technical means known to those skilled in the art.

[0050] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0051] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A combined aquatic plant-microorganism sediment remediation reactor, characterized in that, include: An ecological tank (1) is provided with bottom mud (4) at the bottom, which is used to plant aquatic plants (5). The ecological tank (1) is also filled with top water (3). A dosing and fixing device (2) is inserted at the top of the bottom mud (4). The bottom of the dosing and fixing device (2) is connected to the interior of the bottom mud (4), and the top is connected to the outside through the top water (3). The dosing and fixing device (2) is used to add microbial agents. The ecological tank (1) is also equipped with a water flow simulation device to simulate water flow.

2. The aquatic plant-microorganism combined sediment remediation reactor according to claim 1, characterized in that: The feeding and fixing device (2) is a cylindrical tube.

3. The aquatic plant-microorganism combined sediment remediation reactor according to claim 1, characterized in that: The water flow simulation device includes a circulating water pump (6), the ecological tank (1) has an inlet (7) at the top and an outlet (8) at the bottom, one end of the circulating water pump (6) is connected to the inlet (7) through a pipeline, and the other end is connected to the outlet (8) through a pipeline.

4. The aquatic plant-microorganism combined sediment remediation reactor according to claim 3, characterized in that: The circulating water pump (6) has multiple speed settings.

5. The aquatic plant-microorganism combined sediment remediation reactor according to claim 1, characterized in that: The dosing fixing device (2) is made of biodegradable material.

6. The aquatic plant-microorganism combined sediment remediation reactor according to claim 1, characterized in that: The ecological tank (1) has dimensions of 40*40*60 cm.

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