Sediment and water co-treatment system for water body polluted by nitrogen and phosphorus nutrients

Abstract

The present application relates to a kind of bottom mud is polluted by nitrogen and phosphorus nutrient salt water body mud-water co-management system, including underwater treatment device, floating device, anchoring device and power supply device;The underwater treatment device includes support frame, submerged plant planting mechanism, bacteria culture mechanism and light source mechanism, the submerged plant planting mechanism plant fixed bed and submerged plant, the bacteria culture mechanism is installed in support frame, including bacteria culture biological filler;The light source mechanism includes several installation on plant fixed bed fluorescent tube, and can be irradiated to submerged plant and bacteria culture biological filler;The floating device includes air bag, inflation pipe and inflation mechanism, the air bag is installed in support frame, the inflation mechanism is set above water surface, the inflation pipe is connected air bag and inflation mechanism;The anchoring device is used to anchor the position of support frame in horizontal direction;The power supply device is set above water surface, power supply is carried out to light source mechanism and inflation mechanism.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water body environmental protection treatment, and particularly relates to a water-sediment co-treatment system for water body sediment polluted by nitrogen and phosphorus nutrients. BACKGROUND

[0002] With the development of water environment treatment, the exogenous pollutants of water body are gradually blocked, and the endogenous pollution problem caused by polluted sediment is increasingly prominent. The treatment of endogenous pollution of water body is increasingly becoming an important content of water environment pollution treatment. The main techniques for sediment pollution treatment are ex-situ treatment and in-situ treatment. The ex-situ treatment mainly removes the pollutants together with the sediment by dredging. This technique has the disadvantages of large engineering quantity, high cost, difficult sediment treatment and disposal, construction time restricted by water level, reduced water body flood control capacity during construction, and great disturbance to the sediment environment on which aquatic organisms depend, thereby affecting the restoration of water body ecological system. Restricted by the disadvantages of ex-situ treatment, in-situ treatment technology emerges as the times require. The in-situ treatment technology mainly includes in-situ sediment covering technology, chemical and microbial agent application, and water body ecological restoration. The in-situ covering technology increases the volume of sediment, reduces the flood control capacity of water body, and the pollutants are not removed. The chemical and microbial agent restoration technology has poor effect when the dosage is small, and destroys the original ecological system when the dosage is large, causing biological death and ecological system destruction. The water body ecological restoration technology has the advantages of low pollution treatment cost, small environmental disturbance, no influence on the flood control capacity of water body, no introduction of new pollutants, and benefit to the restoration of aquatic ecological system, and therefore, becomes an important means for sediment pollution treatment.

[0003] The sediment treatment technology of water body ecological restoration mainly promotes the construction of aquatic ecological system structure by restoring the substrate environment of water body, introducing submerged plants, and introducing aquatic animals, so as to remove the pollutants of sediment by using the root absorption of submerged plants and the increase of microbial activity. The existing water body ecological restoration technology mainly directly plants submerged plants and releases aquatic animals in the polluted sediment with conditions for planting submerged plants. However, the following problems exist in the application: (1) The pollutant removal effect of the food web naturally formed by the aquatic ecological system is slow and poor; (2) The submerged plants are located underwater, and underwater operation is needed during planting and operation, which is difficult to operate; (3) The submerged plants need sufficient light, and high water level or high water turbidity will affect the propagation of light in water body, and the short solar radiation time in late autumn, winter and early spring cannot provide sufficient light for the growth of submerged plants, which affects the growth of submerged plants and the construction of aquatic ecological system, and therefore, the current sediment ecological restoration technology cannot be applied to the treatment of sediment pollution in water body with too deep water or high water turbidity, and the treatment effect in late autumn, winter and early spring is greatly reduced or even has no effect. SUMMARY

[0004] In view of the above-mentioned disadvantages of the prior art, the technical problem to be solved by the present application is to provide a sediment-nitrogen and phosphorus nutrient salt contaminated water body mud-water co-treatment system, which can solve the problems of slow pollution treatment, poor effect, difficult operation and maintenance, limitation by water depth and water turbidity conditions, and influence by seasonal changes in the prior art, while having the advantages of low operation and maintenance cost, low carbon or even carbon fixation.

[0005] To achieve the above-mentioned purpose, the present application provides a sediment-nitrogen and phosphorus nutrient salt contaminated water body mud-water co-treatment system, which comprises an underwater treatment device, a floating device, an anchoring device and a power supply device; the underwater treatment device comprises a support frame, a submerged plant planting mechanism, a bacteria culture mechanism and a light source mechanism, the support frame is used to be placed on the bottom surface of the water body, the submerged plant planting mechanism comprises a plant fixed bed installed on the support frame and submerged plants planted on the plant fixed bed, the bacteria culture mechanism is installed on the support frame and comprises bacteria culture biological fillers; the light source mechanism comprises a plurality of light emitting lamp tubes installed on the plant fixed bed, the light emitted by the light emitting lamp tubes can irradiate the submerged plants and the bacteria culture biological fillers; the floating device comprises an air bag, an inflation pipe and an inflation mechanism, the air bag is installed on the support frame, the inflation mechanism is arranged above the water surface, and the inflation pipe connects the air bag and the inflation mechanism; the anchoring device is connected with the support frame and anchors the position of the support frame in the horizontal direction; the power supply device is arranged above the water surface and is electrically connected with and supplies power to the light source mechanism and the inflation mechanism.

[0006] Further, the plant fixed bed of the submerged plant planting mechanism is a net structure and is woven by a hanging three-dimensional elastic biological filler.

[0007] Further, the varieties of the submerged plants of the submerged plant planting mechanism include Potamogeton crispus, Vallisneria and Myriophyllum.

[0008] Further, the bacteria culture biological fillers of the bacteria culture mechanism culture microorganisms, and the types of the microorganisms include photosynthetic bacteria, nitrifying bacteria, nitrosobacteria, denitrifying bacteria, phosphorus accumulating bacteria and ammonifying bacteria.

[0009] Further, the light emitting lamp tubes of the light source mechanism are vertically arranged, the vertical length is 40-80 cm, the light intensity is 4000-8000 Lux, the light emitting lamp tubes are a plurality of, are evenly distributed in a ring shape with the center of the plant fixed bed as the center, and the distance between adjacent lamp tubes is 0.5-1 m.

[0010] Further, the light source mechanism further comprises a photosensitive sensor arranged on the plant fixed bed.

[0011] Further, the center point and the edge of the plant fixed bed are provided with photosensitive sensors, and the middle of any two adjacent light emitting lamp tubes is provided with a photosensitive sensor.

[0012] Further, the power supply device comprises a solar photovoltaic panel and a storage battery, an electric wire is arranged between the solar photovoltaic panel and the storage battery for connection, and the light source mechanism and the inflation mechanism are connected with the storage battery through the electric wire.

[0013] Further, the anchoring device comprises a fixing pile and a connecting piece, the fixing pile is fixed in the soil body at the bottom of the water body or the shore, and the connecting piece connects the fixing pile and the support frame body.

[0014] Further, the connecting piece is a connecting sleeve, the connecting sleeve is fixedly connected with the support frame body, and the connecting sleeve is sleeved on the fixing pile and can move up and down.

[0015] As described above, the present application relates to a water-sediment co-treatment system for a water body polluted by nitrogen and phosphorus nutrients, and has the following beneficial effects:

[0016] 1. The artificial aquatic ecological system food chain is constructed by using the high-efficiency sediment degradation microorganism cultured by directional selection and the single submerged plant with developed root system, the species competition between the same nutrition levels is reduced, the division of labor and cooperation of different nutrition levels in the degradation and conversion of nitrogen and phosphorus pollutants is improved, the removal efficiency of pollutants is improved, the growth and metabolic rate of microorganisms and submerged plants are strengthened by artificially arranging light sources, and the removal efficiency of pollutants is further improved, so that the treatment effect and speed of the nitrogen and phosphorus pollutants in the sediment can be greatly improved.

[0017] 2. The automatic sinking and floating of the underwater treatment device is realized by using the floating device, the planting and operation and maintenance of the submerged plant are facilitated, the periodic update of the bacteria culture mechanism is facilitated, the problem of underwater planting and operation and maintenance of the aquatic ecological system is solved, the submerged plant and the microorganism system can be kept in high-efficiency operation, and the treatment effect of the nitrogen and phosphorus pollutants in the sediment is further ensured.

[0018] 3. The light required for the growth of photosynthetic bacteria and submerged plants is provided by arranging artificial light sources, the dependence of the construction of the aquatic ecological system on sunlight is reduced, the problem that the sediment remediation technology of the aquatic ecological system is limited by the depth of the sediment and the turbidity of the water body is solved, and the application range of the sediment remediation technology of the aquatic ecological system is greatly improved. At the same time, the treatment of the sediment by the sediment remediation technology of the aquatic ecological system is not affected by seasons, and the treatment effect of the nitrogen and phosphorus pollutants in the sediment by the sediment remediation technology of the aquatic ecological system is further improved.

[0019] 4. The solar energy is used for power supply, the submerged plant can efficiently fix carbon, the equipment can be repeatedly used, the operation and maintenance cost is low, the low-carbon or carbon-fixing treatment of the sediment is realized, and the device can be used and released repeatedly and recycled multiple times. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1It is a structural schematic diagram of the mud-water co-treatment system for water bodies polluted by nitrogen and phosphorus nutrients in the bottom mud of the present invention.

[0021] Figure 2 Schematic diagram of the structure of the underwater treatment device in the present invention

[0022] Figure 3 for Figure 2 Top view of .

[0023] Figure 4 It is a structural schematic diagram of the power supply device in the present invention.

[0024] Explanation of Figure Numbers

[0025] 1 Underwater treatment device

[0026] 11 Submerged plant cultivation institutions

[0027] 111 Plant fixed bed

[0028] 112 Submerged Plants

[0029] 12 Bacteria culture institutions

[0030] 13 Light source mechanism

[0031] 131 Luminous Tube

[0032] 132 photosensors

[0033] 14 Support frame

[0034] 2 Flotation devices

[0035] 21 Airbag

[0036] 22 Inflatable tube

[0037] 23 Inflatable mechanism

[0038] 3 Anchoring device

[0039] 31 fixed piles

[0040] 32 connectors

[0041] 4 Power supply device

[0042] 41 Solar Photovoltaic Panels

[0043] 42 batteries

[0044] 43 Wires DETAILED DESCRIPTION

[0045] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0046] It should be noted that the structure, proportion, size, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and are not used to limit the conditions for implementing the present application, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose of the present application, should still fall within the scope of the disclosed technology.

[0047] Referring to Figures 1 to 4 The present application provides a bottom sediment and nitrogen and phosphorus nutrient salt contaminated water body mud-water co-governance system, which comprises an underwater treatment device 1, a floating device 2, an anchoring device 3 and a power supply device 4; the underwater treatment device 1 comprises a support frame 14, a submerged plant planting mechanism 11, a bacteria culture mechanism 12 and a light source mechanism 13, the support frame 14 is used to be placed on the bottom surface of the water body, the submerged plant planting mechanism 11 comprises a plant fixed bed 111 installed on the support frame 14 and submerged plants 112 planted on the plant fixed bed 111, the bacteria culture mechanism 12 is installed on the support frame 14 and comprises bacteria culture biological fillers; the light source mechanism 13 comprises a plurality of light emitting lamp tubes 131 installed on the plant fixed bed 111, the light emitted by the light emitting lamp tubes 131 can irradiate the submerged plants 112 and the bacteria culture biological fillers; the floating device 2 comprises an air bag 21, an inflation pipe 22 and an inflation mechanism 23, the air bag 21 is installed on the support frame 14, the inflation mechanism 23 is arranged above the water surface, and the inflation pipe 22 is connected with the air bag 21 and the inflation mechanism 23; the anchoring device 3 is connected with the support frame 14 and anchors the position of the support frame 14 in the horizontal direction; the power supply device 4 is arranged above the water surface and is electrically connected with and supplies power to the light source mechanism 13 and the inflation mechanism 23.

[0048] The main working principle of the sludge-nitrogen and phosphorus nutrient salt pollution water body mud-water co-treatment system of the application is as follows: when installed, the air bag 21 is not inflated, the underwater treatment device 1 sinks into the water body by gravity and is placed on the bottom surface of the water body through the support frame body 14, and the support frame body 14 is used to bear the submerged plant planting mechanism 11, the fungus culture mechanism 12 and the light source mechanism 13. The anchor device 3 is used to anchor the support frame body 14, so as to stabilize the position of the underwater treatment device 1 in the horizontal direction and avoid movement of the underwater treatment device 1 under the action of water flow. The fungus culture biological filler of the fungus culture mechanism 12 can be pre-cultured with corresponding microorganisms capable of efficiently degrading sludge. During the treatment process, the power supply device 4 supplies power to the light source mechanism 13, the light emitting lamp tube 131 emits light, and the light is provided for the submerged plants 112 and the microorganisms in the fungus culture biological filler, so as to promote the growth of the submerged plants 112 and the microorganisms and avoid affecting the growth due to insufficient light. The submerged plants 112 and the fungus culture mechanism construct an ecological system of the water body, and the sludge pollutants are removed by using the root system of the submerged plants 112 and the increased activity of the microorganisms. When the underwater treatment device 1 needs to be maintained, the air bag 21 is inflated through the inflation mechanism 23 of the floating device 2, the gas enters the air bag 21 through the inflation pipe 22, the air bag 21 provides buoyancy, the underwater treatment device 1 is floated to the water surface, and then the maintenance is performed. After the maintenance is completed, the gas in the air bag 21 is gradually released, and the underwater treatment device 1 sinks into the water again under the action of gravity, so that the maintenance work under the water can be avoided, and the use is flexible and convenient.

[0049] The sludge-nitrogen and phosphorus nutrient salt pollution water body mud-water co-treatment system of the application can provide light, the growth of the submerged plants 112 and the microorganisms is not limited by the water depth and the turbidity of the water body, is not affected by seasonal changes, has good pollution treatment effect, is simple to operate and maintain, basically avoids underwater maintenance work, has the advantages of low construction and maintenance cost, low carbon or even carbon fixation, and can realize random use and random release and multiple recycling of the system.

[0050] Reference is made to Figures 1 to 4 , and the application is further described below by taking a specific embodiment as an example:

[0051] In this embodiment, reference is made to Figure 2 and Figure 3 , as a preferred design, the fungus culture biological filler of the fungus culture mechanism 12 shares the plant fixed bed 111 with the submerged plants 112, that is, the fungus culture biological filler is arranged in the plant fixed bed 111, and the structure is simplified. Of course, in other embodiments, the fungus culture mechanism 12 can also independently arrange an appliance bearing the fungus culture biological filler.

[0052] In this embodiment, reference is made to Figure 2 and Figure 3As a preferred design, the plant fixed bed 111 of the submerged plant planting mechanism 11 is a net structure and is woven by a hanging three-dimensional elastic biological filler, a single hanging three-dimensional elastic biological filler has a diameter of 5-10 cm, and the mesh size of the net structure is 5-15 cm in length of side. With this structure design, the plant fixed bed 111 can be beneficial to the planting and growth of the submerged plant 112, and can provide an attachment area for microorganisms in water, so that the microorganisms can grow, reproduce and degrade organic matter more efficiently in water, and the wastewater treatment effect is improved.

[0053] In the embodiment, referring to Figure 2 and Figure 3 , as a preferred design, the submerged plant 112 of the submerged plant planting mechanism 11 includes but is not limited to a variety of species such as Potamogeton crispus, Vallisneria, Myriophyllum etc., and one or more of them can be used.

[0054] In the embodiment, referring to Figure 2 and Figure 3 , as a preferred design, the microorganism is cultured in the fungus culture biological filler of the fungus culture mechanism 12, and the type of the microorganism includes but is not limited to photosynthetic bacteria, nitrifying bacteria, nitrosifying bacteria, denitrifying bacteria, phosphorus accumulating bacteria and ammonifying bacteria etc., and one or more of them can be selected. Preferably, the obtained bacterial colony is collected by using the sludge from the water body to be purified before use, the obtained bacterial colony is further cultured, and the obtained photosynthetic bacteria agent is cultured under underwater light conditions. The bacterial species in the bacterial colony include but are not limited to photosynthetic bacteria, nitrifying bacteria, nitrosifying bacteria, denitrifying bacteria, phosphorus accumulating bacteria, ammonifying bacteria etc., and the biofilm culture under corresponding temperature conditions is carried out in different seasons.

[0055] In the embodiment, referring to Figure 2 and Figure 3, as a preferred design, the light emitting lamp tube 131 of the light source mechanism 13 is vertically arranged, and the vertical length is 40-80 cm, the light intensity is 4000-8000 Lux, the light emitting lamp tube 131 is multiple, preferably 6, and is uniformly distributed in a ring around the center of the plant fixed bed 111, and the distance between adjacent lamp tubes is 0.5-1 m, so as to ensure that the light emitting lamp tube 131 can provide appropriate light. Further, the light source mechanism 13 further comprises a photosensitive sensor 132 arranged on the plant fixed bed 111, and the photosensitive sensor 132 is arranged at the center point and the edge of the plant fixed bed 111, and the photosensitive sensor 132 is arranged at the middle of any two adjacent light emitting lamp tubes 131, and the light intensity of the light emitting lamp tube 131 is adjusted by the photosensitive sensor 132. Preferably, a control mechanism can also be provided, which is connected with the photosensitive sensor 132 and the light source mechanism 13, and can automatically control the light intensity of the light emitting lamp tube 131 of the light source mechanism 13 according to the signal received from the photosensitive sensor 132. The on-off, number and spatial distribution of the light emitting lamp tube 131 are adjusted by the light intensity and time received by the photosensitive sensor 132, so as to ensure that the submerged plant 112 is illuminated for 12-18 h every day.

[0056] In this embodiment, referring to Figure 1 and Figure 4 , as a preferred design, the power supply device 4 comprises a solar photovoltaic panel 41 and a storage battery 42, and an electric wire 43 is arranged between the solar photovoltaic panel 41 and the storage battery 42 for connection, and the light source mechanism 13 and the inflation mechanism 23 are connected with the storage battery 42 through the electric wire 43. The power supply device 4 can be arranged on the floating platform floating on the water surface, or can be arranged on the shore, and the specific arrangement can be determined according to the position of the underwater management device 1. The area of the solar photovoltaic panel 41 is determined according to the winter solar radiation of the area where the photovoltaic panel can be arranged, the photovoltaic panel power generation efficiency and the device light source daily deficiency, and the capacity of the storage battery 42 is determined according to the winter device light source daily deficiency. The power supply device 4 uses solar charging, and can stably supply power for a long time.

[0057] In this embodiment, referring to Figure 1 and Figure 3As a preferred design, the anchoring device 3 comprises a fixed pile 31 and a connecting member 32, the fixed pile 31 is fixed in the soil at the bottom of the water body or the shore, and the specific position is determined according to the position of the underwater management device 1, the connecting member 32 connects the fixed pile 31 and the support frame body 14, wherein the connecting member 32 is a connecting rope, the two ends of the connecting rope are connected to the fixed pile 31 and the support frame body 14 respectively, the anchoring device 3 is provided in multiple sets, and at least the anchoring device 3 is provided on the opposite sides of the support frame body 14 to anchor, the connecting rope is in a straightened state, and can limit the movement of the support frame body 14 in the horizontal direction. When it is needed to make the underwater management device 1 float, the connecting rope can be released. The pulling force of the connecting rope is determined according to the maximum flow rate of the water body and the weight of the device, and the length is determined according to the distance between the position where the fixed pile 31 is conveniently driven into and the underwater management device 1.

[0058] In another embodiment, preferably, the connecting member 32 can adopt a connecting sleeve, the connecting sleeve is fixedly connected with the support frame body 14, the connecting sleeve is sleeved on the fixed pile 31 and can move up and down, at this time, the anchoring device 3 is provided in multiple sets, and at least the anchoring device 3 is provided on the opposite sides of the support frame body 14 to anchor, so that the position of the support frame body 14 can be stabilized, and when it is needed to make the underwater management device 1 float or sink, the connecting sleeve can move up and down along the fixed pile 31, and the underwater management device 1 can be smoothly floated or sunk by additional operation, and the operation is convenient.

[0059] In the embodiment, referring to Figure 1 and Figure 3 , as a preferred design, the support frame body 14 of the underwater management device 1 comprises a square frame and four feet, the four feet fix the bottom of the square frame, and the vertical length of the feet is 10-25 cm, which can be inserted into the soil. The support frame body 14 is made of plastic products with a density of 2-5 g / cm 3 , a tensile strength of ≥100 Mpa, a compressive strength of ≥50 Mpa, a hardness of 70-90 HD, and a flexural modulus of 5-10 GPa.

[0060] In the embodiment, referring to Figure 1 and Figure 3 , as a preferred design, the air bag 21 of the floating device 2 is installed on two edges of the square frame of the support frame body 14, and the other two opposite edges are connected with the anchoring device 3. The size of the air bag 21 is determined according to the buoyancy required by the underwater management device 1 to float, and the inflating mechanism 23 is determined according to the size and material of the air bag 21. The inflating mechanism 23 and the power supply device 4 are arranged together, and can be arranged on the floating platform floating on the water surface or on the shore.

[0061] The use method of the sediment-nutrient salt pollution water body mud-water co-management system includes: (a) according to the growth characteristics of the submerged plant 112, the litter of the submerged plant 112 is removed, and the replacement of the poor plant is carried out; (b) before the use of the bacteria culture mechanism 12, the bacteria colonies obtained by further expansion culture of the bacteria colonies obtained from the sediment collection and culture and the commercial photosynthetic bacteria agents purchased are used to carry out the biofilm culture under the underwater light conditions, and after the biofilm culture is completed, the bacteria culture mechanism 12 is fixed on the frame and placed in the water body for use; if there is cross-season use, the biofilm culture under the corresponding temperature condition of the next season needs to be carried out when the season is changed.

[0062] As can be seen from the above, the sediment-nutrient salt pollution water body mud-water co-management system has the following beneficial effects:

[0063] 1. The artificial aquatic ecological system food chain is constructed by using the high-efficiency sediment degradation microorganism obtained by directional selection culture and the single submerged plant 112 with developed root system, the species competition between the same nutrition levels is reduced, the division of labor and cooperation of different nutrition levels in the degradation and conversion of nitrogen and phosphorus pollutants is improved, the removal efficiency of the pollutants is improved, and the growth and metabolism rate of the microorganism and the submerged plant 112 is strengthened by artificially arranging the light source, so that the removal efficiency of the pollutants is further improved, thereby the treatment effect and speed of the sediment nitrogen and phosphorus pollutants can be greatly improved.

[0064] 2. The automatic sinking and floating of the underwater treatment device 1 is realized by using the floating device 2, the planting and operation and maintenance of the submerged plant 112 are facilitated, the regular replacement of the bacteria culture mechanism 12 is facilitated, the underwater planting and operation and maintenance of the aquatic ecological system are solved, and the high-efficiency operation of the submerged plant 112 and the microorganism system is ensured, and the treatment effect of the sediment nitrogen and phosphorus pollution is further ensured.

[0065] 3. The light source is arranged to provide light for the growth of the photosynthetic bacteria and the submerged plant 112, the dependence of the aquatic ecological system construction on sunlight is reduced, and the problem that the aquatic ecological system sediment repair technology is limited by the depth of the sediment and the turbidity of the water body is solved, so that the application range of the aquatic ecological system sediment repair technology is greatly improved. At the same time, the treatment of the sediment by the aquatic ecological system sediment repair technology is not affected by the season, and the treatment effect of the sediment nitrogen and phosphorus pollution by the aquatic ecological system sediment repair technology is further improved.

[0066] 4. The submerged plant 112 can efficiently fix carbon by using solar power, the equipment can be repeatedly used, the operation and maintenance cost is low, the low-carbon or carbon-fixing treatment of the sediment is realized, and the device can be used and placed repeatedly and recycled.

[0067] In summary, the present application effectively overcomes the shortcomings of the prior art and has high industrial utilization value.

[0068] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A system for co-treatment of nitrogen and phosphorus nutrient salt contaminated water body and sediment, characterized in that: The application relates to an underwater management device (1), a floating device (2), an anchoring device (3) and a power supply device (4); the underwater management device (1) comprises a support frame (14), a submerged plant planting mechanism (11), a bacteria culture mechanism (12) and a light source mechanism (13); the support frame (14) is arranged on the bottom of a water body; the submerged plant planting mechanism (11) comprises a plant fixed bed (111) arranged on the support frame (14) and submerged plants (112) planted on the plant fixed bed (111); the bacteria culture mechanism (12) is arranged on the support frame (14) and comprises bacteria culture biological fillers; the light source mechanism (13) comprises a plurality of light emitting lamp tubes (131) arranged on the plant fixed bed (111), and the light emitted by the light emitting lamp tubes (131) can irradiate the submerged plants (112) and the bacteria culture biological fillers; the floating device (2) comprises an air bag (21), an inflation pipe (22) and an inflation mechanism (23); the air bag (21) is arranged on the support frame (14); the inflation mechanism (23) is arranged above the water surface; the inflation pipe (22) is connected with the air bag (21) and the inflation mechanism (23); the anchoring device (3) is connected with the support frame (14) and anchors the support frame (14) in the horizontal direction; the anchoring device (3) comprises a fixed pile (31) and a connecting piece (32); the fixed pile (31) is fixed in the soil at the bottom of the water body or the shore; the connecting piece (32) connects the fixed pile (31) and the support frame (14); the connecting piece (32) is a connecting sleeve which is fixedly connected with the support frame (14) and can move up and down on the fixed pile (31); the power supply device (4) is arranged above the water surface and is electrically connected with and supplies power to the light source mechanism (13) and the inflation mechanism (23); the light emitting lamp tubes (131) of the light source mechanism (13) are vertically arranged and have a vertical length of 40-80 cm and a light intensity of 4000-8000 Lux; the light emitting lamp tubes (131) are multiple and are evenly distributed in a ring shape with the center of the plant fixed bed (111) as the center, and the distance between adjacent lamp tubes is 0.5-1 m; the light source mechanism (13) further comprises photosensitive sensors (132) arranged on the plant fixed bed (111); the center point and the edge of the plant fixed bed (111) are provided with the photosensitive sensors (132), and the middle of any two adjacent light emitting lamp tubes (131) is provided with the photosensitive sensor (132); the application further comprises a control mechanism which is communicatively connected with the photosensitive sensors (132) and is connected with the light source mechanism (13) for automatically controlling the light intensity of the light emitting lamp tubes (131); the power supply device (4) comprises a solar photovoltaic panel (41) and a storage battery (42); wires (43) are arranged between the solar photovoltaic panel (41) and the storage battery (42) for connection; the light source mechanism (13) and the inflation mechanism (23) are connected with the storage battery (42) through the wires (43).

2. The system according to claim 1, wherein the system is characterized in that: The plant fixed bed (111) of the submerged plant planting mechanism (11) is a net structure and is woven by a hanging three-dimensional elastic biological filler.

3. The system according to claim 1, wherein the system is characterized in that: The species of the submerged plant (112) of the submerged plant planting mechanism (11) include Potamogeton crispus, Vallisneria and Myriophyllum.

4. The system according to claim 1, wherein the system is characterized in that: The microorganism culture biological filler of the microorganism culture mechanism (12) is used for culturing microorganisms, and the types of the microorganisms include photosynthetic bacteria, nitrifying bacteria, nitrosifying bacteria, denitrifying bacteria, phosphorus accumulating bacteria and ammonifying bacteria.

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