CN109231658B

CN109231658B - Movable ecological medium box for restoring eutrophication natural water body

Info

Publication number: CN109231658B
Application number: CN201811006844.1A
Authority: CN
Inventors: 王趁义; 郭炜超; 王凤玲; 杨李军; 徐耀阳
Original assignee: Ningbo Shenggan Environmental Technology Development Co ltd; Zhejiang Wanli University
Current assignee: Zhejiang Wanli University
Priority date: 2018-08-31
Filing date: 2018-08-31
Publication date: 2022-05-24
Anticipated expiration: 2038-08-31
Also published as: CN109231658A

Abstract

The invention discloses a movable ecological medium box for restoring eutrophic natural water, which comprises a box body and a floating ball connected with the box body, wherein the box body is divided into a first packing layer, a second packing layer, a third packing layer and a fourth packing layer from top to bottom by a movable isolation plate; planting matrixes are filled in the fourth packing layer, submerged plants are planted in the planting matrixes, and the submerged plants penetrate through the third packing layer to the first packing layer from bottom to top and extend out of the upper surface of the box body through planting pipes; the first to third packing layers are filled with matrix packing with different particle sizes, and a plurality of bamboo balls are connected below the box body. The multi-stage pollutant adsorption device has the advantages of capability of adsorbing pollutants in multiple levels and multiple stages, recycling, convenience in management, certain landscape and environmental friendliness.

Description

Movable ecological medium box for restoring eutrophication natural water body

Technical Field

The invention relates to the field of water body ecological restoration and landscape improvement, in particular to a movable ecological medium box for restoring eutrophicated natural water body.

Background

Along with the continuous development of global urbanization, the eutrophication of the water body of the river channel becomes one of the environmental problems which are much concerned by the world, which seriously restricts the sustainable development of national economy, destroys the beautiful image of the city and threatens the ecological safety and human health.

Conventional river regulation techniques include physical, chemical and biological methods. The physical method comprises the technologies of dredging, water diversion and sewage flushing, aeration and the like, and is characterized in that the pollutants in the water body have obvious removal effect, but the engineering quantity is large, the operation cost is higher, the economic benefit is poor, and the temporary solution is not the permanent solution; the chemical method mainly comprises the step of adding a chemical reagent into the polluted water body, and is characterized by simple operation, strong pertinence, obvious effect and quick response, can quickly reduce the concentration of pollutants in water, has secondary pollution risk, is not suitable for large-area natural water bodies, and needs to be matched with other methods for use; the biological method comprises a plant method, an animal method and a microorganism method, and is characterized by environmental protection and economy, can improve the biological diversity and the landscape of the water body, but has long treatment period, is limited by external conditions and water quality of the water body, and also needs to be combined with other processes such as an ecological floating bed and the like. In a word, the eutrophication problem of the water body cannot be effectively treated by a single treatment technology. Therefore, a physical method, a chemical method and a biological method need to be comprehensively utilized to form a comprehensive treatment means to make up for the defects of the conventional technology, which is a mainstream technology for treating the polluted water body.

At present, in the existing technology, for example, a comprehensive treatment technology related in the utility model design of Tongning army (CN 206692419U): the ecological medium box comprises a plant planting area and a medium filling area, wherein the upper layer of the plant planting area can be used for planting aquatic plants, the lower layer of the medium filling area can be filled with ecological matrix particles, and the box body is provided with a plurality of water permeable holes and is fixed on a revetment by utilizing guide rail nuts; however, the medium box is directly fixed on the shore, so that the treatment range is limited, plants are directly rooted in the phosphorus removal filler of the adsorption substrate, the high alkalinity of the used adsorption substrate has certain influence on the growth of the plants, the sorting and recycling of the substrate are not considered, and the problems of waste and cost exist; in addition, the structure is that the aquatic plants are arranged on the uppermost layer, so that the substrate for providing nutrients for the aquatic plants in the box body is inevitably positioned on the upper part, and the substrate is easy to run off and the aquatic plants are unstable under the flowing and scouring of the surface layer of the water body, so that the use effect of the aquatic plants in the whole box body is reduced; in addition, the filler below the medium box is only the phosphorus removal filler, and the grading and grading effects of the filler are not considered, so that the pollutant removal effect is not ideal.

For example, Wangzhirong (CN105399220A) designs a suspended ecological restoration plate and a multi-medium artificial sinking bed thereof, which mainly use the combination of multi-medium adsorption, microbial degradation and submerged plants to solve the technical problems of limited growth area of the pool wall, difficult root-tying of the plants on the pool wall and influence on the growth and breeding of the submerged plants existing in the prior slope protection ecological bag. The suspended ecological restoration plate is 1cm in thickness, is suspended on the floating body, can only purify a single shallow water body, and is easy to be damaged by the flowing water body and enter the water bottom once the water flow speed is high (such as lakes and reservoirs) or the rainstorm weather is met; the used degradable starch granules can undoubtedly increase the COD content in the water body; meanwhile, the invention does not consider the recycling of the ecological restoration board and the internal matrix material thereof, thereby greatly increasing the treatment cost; more importantly, the zeolite, the activated carbon and the degradable starch particles are mixed together for use, the starch blocks the pores of the zeolite and the activated carbon, the treatment efficiency is greatly reduced, different pollutants cannot be effectively degraded and filtered in different layers, and the arrangement is inconvenient for sorting and recycling of the filler.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the movable ecological medium box for restoring the eutrophic natural water body, which can adsorb pollutants in multiple levels and multiple steps, can be recycled, is convenient to manage, has certain landscape and is environment-friendly.

In order to solve the technical problems, the invention adopts the technical scheme that: a movable ecological medium box for restoring eutrophic natural water comprises a box body and a floating ball connected with the box body, wherein the box body is divided into a first packing layer, a second packing layer, a third packing layer and a fourth packing layer from top to bottom through a movable isolation plate; the fourth packing layer is filled with planting matrix, submerged plants are planted in the planting matrix, and the submerged plants penetrate through the third packing layer to the first packing layer from bottom to top and extend out of the upper surface of the box body through planting pipes (transparent plastic pipes); the first to third packing layers are filled with matrix packing with different particle sizes, and a plurality of bamboo balls are connected below the box body.

Preferably, the planting matrix in the fourth packing layer is bottom mud in the restored water body, and the submerged plants are planted in the planting matrix and extend out of the box body through transparent plastic pipes (planting pipes).

Preferably, the fillers in the first filler layer to the third filler layer are graded positively or negatively: in the positive grading mode, the first packing layer is filled with activated carbon, the second packing layer is filled with ceramsite, and the third packing layer is filled with zeolite; in the reverse grading mode, zeolite is filled in the first packing layer, ceramsite is filled in the second packing layer, and activated carbon is filled in the third packing layer; in the positive grading mode and the negative grading mode, the particle size of the zeolite is 15-20mm, the particle size of the ceramsite is 10-15mm, and the particle size of the activated carbon is 5-8 mm.

Preferably, in order to facilitate the exchange of substances and energy inside and outside the box body, a plurality of micropores are uniformly distributed on the side wall of the box body where the first to third packing layers are positioned, and the pore diameter of each micropore of each packing layer is smaller than the diameter of the packing particles in the micropore. By adopting the structure, the water body can be fully contacted with the filler, and the filler is prevented from flowing out.

Preferably, the bamboo balls are dense bamboo balls woven by natural moso bamboos and used as fillers, have certain hydrophilicity and biocompatibility, are high in film forming speed, can provide a carbon source, and facilitate film forming of indigenous microorganisms.

Preferably, the packing layers are separated by movable isolation plates with the area smaller than the internal area of the box body, the movable isolation plates are supported in the box body by inner supports (isolation rings), a plurality of through holes are formed in the movable isolation plates positioned between the first packing layer and the second packing layer and between the second packing layer and the third packing layer, and the aperture of each through hole is smaller than the particle size of the packing in the packing layer on which the upper part of the through hole is positioned; the upper end surface of the box body, which is positioned on the first packing layer, is provided with a through hole upper cover; by adopting the structure, the inner support is provided with the first spacer for placing the partition board to realize the partition of each packing layer in the box body, simultaneously the partition board can be prevented from excessively sinking to press the matrix material of the next layer, and the partition of the movable partition board is convenient for sorting various matrix adsorbing materials when the matrix is regenerated; the through holes arranged on the isolation plate are smaller than the filler particles, so that the filler can be prevented from leaking to the next layer, and meanwhile, the water can be kept to flow smoothly among the filler layers, and the purification effect is improved; the upper part of the box body is provided with the cover, so that the loss of the filler in the box body can be prevented, and the purifying effect of the box body cannot be influenced when the box body is inclined or overturned under the condition of wind waves or water flow.

Preferably, the floating ball and the box body are connected with each other through a corrosion-resistant rope, the length of the floating ball and the box body can be adjusted according to the depths of different water bodies, and the depth adjustment of the sinking and floating of the box body is realized.

Preferably, the floating ball is a corrosion-resistant PVC foam floating ball and is connected to four corners of the top of the box body through corrosion-resistant ropes. During specific implementation, the device can be flexibly adjusted according to the water depth of a tested river channel, has certain landscape property and is integrated with nature as a pollution disposal device. The specification of the device can be flexibly adjusted along with the area of the water area.

Preferably, the box body and the isolation plate are made of PVC, so that the box body and the isolation plate have good light transmission, corrosion resistance, stability and strength, long service life and low price.

Preferably, the restored water body is also provided with an air explosion device,

the invention has the advantages and beneficial effects that:

1. the device can be adjusted by adjusting the length of the connecting rope, is suitable for riverways, lakes and reservoirs with different depths, and is movable and high in flexibility.

2. The invention selects cheap and reproducible adsorption matrix, and uses the movable isolation plate to separate the matrix, thereby being convenient for recycling and regenerating the matrix after saturated adsorption, saving time and labor, and the movable isolation plate and the box body are provided with micropores at the periphery, thereby fully playing the adsorption capacity of the adsorption matrix, promoting the flow of substances and energy and being beneficial to the biofilm formation of microorganisms.

3. The invention adopts natural bamboo balls as a filler for purifying water for the first time, and the natural bamboo balls are connected to four corners at the lower bottom of the box body by iron wires; because the bamboo ball has certain hydrophilicity and biocompatibility and high film forming speed, a thick biological film (finishing film forming) can be formed on the bamboo ball generally within 10-12 days, indigenous microorganisms on the bamboo ball can decompose and utilize pollutants in a water body and promote the purification of the water body, and the bamboo ball is low in cost and easy to obtain compared with the traditional film forming filler.

4. The aquatic plant of the present invention is different from the above patent in that it is not planted in the adsorption matrix, but planted in the bottom mud, the bottom mud is taken from the repaired river and lake reservoir, which facilitates the growth of indigenous microorganisms, and the plant is isolated from the adsorption matrix by the transparent tube, which is beneficial to the photosynthesis of the plant and can avoid the influence of the plant growth and water purification caused by the factors such as the extrusion of the adsorption matrix to the plant and the alkaline damage of the adsorption matrix.

5. The invention is provided with the upper cover which is buckled by the right-angle buckle, has firm structure and can not be scattered, and even if the box body turns over due to special conditions such as storm and the like, the matrix in the box body can not be separated from the box body and enter the water body and the bottom mud, thereby causing the pollutants to return to the water body again.

6. The invention has the comprehensive functions of biological restoration (aquatic plants), microbial restoration (bamboo balls, adsorption matrix materials and various microorganisms on plant roots), wetland restoration (the ecological medium box also refers to the artificial wetland technology, and the side of the box body is provided with various water permeable holes with different apertures, which is beneficial to the exchange of substances and energy inside and outside the box body and is similar to the artificial wetland) and environment-friendly adsorption materials (zeolite, ceramsite and active carbon), and the like, and the removal of pollutants in the water body is completed by mutual cooperation.

7. Experiments prove that the medium box bodies with the specific arrangement sequence are suitable for water bodies (such as lakes and reservoirs) seriously polluted by phosphorus in a positive gradation mode (active carbon, ceramsite and zeolite are respectively paved from top to bottom); the reverse grading mode (respectively laying zeolite, ceramsite and activated carbon from top to bottom) is suitable for water bodies (such as urban inland rivers) with serious nitrogen pollution; the positive stage and the negative stage can be put in the same water area in a crossed way, so that a more comprehensive pollutant removing effect is realized. In addition, the invention has the outstanding advantages that the medium box can repair water bodies with different depths, areas and pollution degrees, and the adsorbing material in the device can be recycled, thereby greatly saving the treatment cost; meanwhile, the remediation effect can be met for water bodies with different pollution degrees, such as urban inland rivers with excessive ammonia nitrogen and lakes and reservoirs with excessive phosphorus, by a replacement grading mode.

8. According to the invention, each substrate layer is separated by the movable isolation plate, because each layer has the internal support to have certain supporting and boundary effects on the isolation plate, if the area of the isolation plate is the same as that of the bottom surface, the isolation plate cannot be installed or taken out, the area smaller than that of the inner layer of the box body is arranged, so that the flexible installation and disassembly are convenient, and the replacement of the substrate material is also convenient; and also to ensure that the filler does not leak out.

9. The submerged plant in the movable ecological medium box is used as a part for restoring polluted water, the variety of the submerged plant can be flexibly selected, and the function of the submerged plant is that the root, stem and leaf of the submerged plant can absorb N, P elements in the water, and the submerged plant can provide a growth environment for microorganisms; research personnel of a subject group find that the bottom mud of the repairing water body is used as a planting substrate of the submerged plant by comparing indexes of plant height, single plant weight, dry weight, death rate, total adventitious stem number, root length, plant number with yellowing appearing leaf, water content, chlorophyll content, plasma membrane permeability, malondialdehyde MDA, root activity and the like of the plant, is more suitable for the growth of the submerged plant, is beneficial to the propagation of indigenous microorganisms, and can fully exert the repairing function of factors of the aquatic plant and the indigenous microorganisms.

Drawings

Fig. 1 is a schematic structural diagram of a movable ecological medium box of the invention.

FIG. 2 is a schematic side view of the present invention.

Fig. 3 is a schematic diagram of the use of the present invention.

FIG. 4 is a schematic diagram of the structure of the upper two-layer isolation board according to the present invention.

FIG. 5 is a schematic diagram of a third layer of the separator structure of the present invention.

Fig. 6 is a schematic view showing the structure of the inner support inside the case body of the present invention.

Detailed Description

The present invention is described in further detail below by way of examples, but the present invention is not limited to only the following examples.

As shown in figures 1-3: the invention relates to a movable ecological medium box for restoring eutrophic natural water, which comprises a box body 1 and a floating ball 2 connected with the box body, wherein the box body is divided into a first packing layer 4, a second packing layer 5, a third packing layer 6 and a fourth packing layer 7 from top to bottom through a movable isolation plate 3; the fourth packing layer 7 is filled with planting matrixes, submerged plants 8 are planted in the planting matrixes, and the submerged plants penetrate through the third packing layer to the first packing layer from bottom to top and extend out of the upper surface of the box body through planting pipes 10 (transparent plastic pipes); the first to third packing layers are filled with matrix packing with different grain diameters, and a plurality of bamboo balls 9 are connected below the box body.

The planting matrix in the fourth packing layer is bottom mud in the restored water body, the submerged plants are planted in the bottom mud of the planting matrix, and the submerged plants (tape grass and the like) are extended out of the box body by vertically arranging transparent plastic pipes 10 in the first to third packing layers.

As an embodiment, a positive grading mode is adopted: the first packing layer is filled with activated carbon, the second packing layer is filled with ceramsite, and the third packing layer is filled with zeolite; the particle size of the active carbon is 5-8mm, the particle size of the ceramsite is 10-15mm, and the particle size of the zeolite is 15-20 mm;

as another embodiment, a reverse grading mode is adopted: the first packing layer is filled with zeolite, the second packing layer is filled with ceramsite, and the third packing layer is filled with activated carbon; the grain size of the zeolite is 15-20mm, the grain size of the ceramsite is 10-15mm, and the grain size of the activated carbon is 5-8mm (reverse grading mode); the present invention preferably employs a reverse-graded packing system.

As shown in fig. 2: a plurality of micropores 1.1 are uniformly distributed on the side wall of a box body 1 where the first to third packing layers are positioned, and the aperture of each micropore of each packing layer is smaller than the diameter of the packing particles in the micropore. Adopt this structure to realize the contact between water and the filler, prevent simultaneously that the filler from running out.

As shown in figures 1-2: the bamboo ball is an intensive bamboo ball woven by natural bamboos and used as a filler; it is connected to four corners at the lower bottom of the box body by iron wires; because the bamboo ball has certain hydrophilicity and biological affinity, the film forming speed is high (the film forming is generally completed within 10-12 days), a thick biological film can be formed on the bamboo ball, the microorganisms on the bamboo ball can decompose and utilize pollutants in the water body, the water body is purified, and the bamboo ball is low in cost and easy to obtain; the bamboo balls are not limited to four corners of the lower bottom of the box body, other positions can be placed, and meanwhile, a plurality of bamboo balls can be connected in series on each corner through iron wires and are not limited to 1 bamboo ball.

As shown in fig. 4-5 and 6, the packing layers are separated by a movable isolation plate 3 with an area slightly smaller than the internal area of the box body, specifically: a movable isolation plate is arranged between the first packing layer and the second packing layer, a movable isolation plate is arranged between the second packing layer and the third packing layer, and a movable isolation plate is also arranged between the third packing layer and the fourth packing layer; the movable isolation plate is supported in the box body by an inner support 12 (an isolation ring is positioned on the inner side wall of the box body and can be arranged at different positions according to the support requirement of the specific movable isolation plate, and figure 6 is only a specific implementation mode, namely four block-shaped inner supports with equal height are arranged on four inner side walls, a plurality of through holes 3.1 are arranged on the movable isolation plate between the first packing layer and the second packing layer and between the second packing layer and the third packing layer, and the aperture of each through hole is smaller than the particle size of the packing in the packing layer at the upper part of the through hole; the upper end surface of the box body positioned on the first packing layer is provided with a through hole upper cover 13 (the through hole upper cover is mainly formed by arranging a through hole on the upper cover, the aperture of the through hole is smaller than the grain diameter of the box body packing, and the upper cover is buckled with the box body by a right-angle buckle, so that the structure is firm and the box body is not scattered).

As shown in fig. 1-2, the floating ball and the tank body of the present invention are connected to each other by a corrosion-resistant rope (e.g., a plastic rope, a nylon rope, etc.) 11, and the length of the floating ball can be adjusted according to the depth of different water bodies, so as to realize the depth of sinking and floating of the tank body. Preferably, the floating ball is a PVC foam floating ball and is connected to four corners of the top of the box body through corrosion-resistant ropes.

When the device is used for treating eutrophic water bodies in rivers, lakes and reservoirs, the depth of a tested water body is determined firstly, then the depth of the tested water body is adapted by adjusting the number of corrosion-resistant ropes and bamboo fillers, finally the device is placed in the water body, the floating ball provides enough buoyancy, submerged plants float below a water level line, the box body is suspended in the middle layer of the water body, the bamboo fillers are suspended in the lower layer of the water body, and the implementation mode is as shown in fig. 3: the device is matched with an aeration device 14 for use, and the aeration device adopts a commercially available product, such as an aeration device which is conventionally used in industries such as a Songbao ultra-silent oxygen increasing pump four-hole adjustable air flow oxygen pump and the like, and can be used for the invention. The submerged plant 9 on the upper layer of the device absorbs nitrogen and phosphorus nutritive salt in the environment through the root system and the stem leaves, and the plant forms an aerobic environment so as to breed microorganisms. The water body enters a packing layer area (matrix area) through micropores in the side wall of the box body and is then blocked by the filler, so that the flow velocity of the water body is reduced and the water body is settled, the matrix adsorbs pollutants through the actions of adsorption, ion exchange and the like, and a biological film is formed on the surface of the matrix to adsorb organic pollutants. The bamboo ball at the lower part has certain hydrophilicity and biological affinity, the film forming speed is high (the film forming is generally finished within 10-12 days), a thick indigenous microbial film can be formed, and pollutants in the water body are decomposed and utilized. From the perspective of engineering technology and recycling ecology, the movable ecological medium box mainly repairs polluted water bodies in an all-around and multi-step way through technologies such as bioremediation (aquatic plants), microbial remediation, wetland remediation and environment-friendly adsorption material adsorption.

In the embodiment, the bottom mud in the restored water body is taken as the planting matrix of the fourth packing layer, and the bottom mud can be used as fertile soil for biological growth, so that the secondary utilization of the bottom mud is realized. The environment adsorbing material in the first to third packing layers is isolated by the isolation plate, and the regeneration or replacement does not need sorting, so that the time and labor are saved, the recycling can be realized after the recovery, the cost is saved, and the environment-friendly and resource-saving effects are realized.

The specific size and the effect of treating the polluted water body of the medium box body of the invention can be described by the following specific examples, wherein an aeration device is adopted to be matched for use in the examples, the aeration rate is 3L/min, and the medium box body belongs to continuous aeration; in the embodiment, a mobile ecological medium box of the invention is put in the water volume of 100L:

example 1

The specifications of the mobile ecological medium box of the embodiment of the invention are as follows: the length multiplied by the width multiplied by the height multiplied by 35cm multiplied by 25cm, and the floating ball provides buoyancy and suspends in the water body. Divide into the four layers in the box, go up the three-layer and be 5cm for adsorbing material, each layer size thickness, the division board that has different diameters hole of permeating water that each layer all used separates, and adsorbing material fills with the mode of reverse gradation, and from the top down the filling order is in proper order: zeolite (grain diameter 15-20mm), ceramsite (10-15mm) and active carbon (5-8mm), wherein the bottom layer is a planting substrate bottom mud layer, the bottom mud layer is planted with submerged plant tape grass, and the submerged plant tape grass extends out of the box body through a transparent pipe. Bamboo fillers, namely bamboo balls, are hung at four corners of the bottom of the box body, and the interval between every two bamboo balls on the same hanging rope is 5 cm. In practical application, CODMn and NH are applied before treatment of polluted river₃78.4mg/L, 9.56mg/L, 4.69mg/L and 15.26mg/L of-N, TP and TN are reduced to 8.4mg/L, 1.21mg/L, 1.88mg/L and 4.72mg/L, and the removal rates are respectively 89.3%, 87.4%, 60.0% and 69.1%.

Example 2

The length, the width and the height of the movable ecological medium box are 35cm, 35cm and 25cm, buoyancy is provided by the floating ball, and the movable ecological medium box is suspended in the water body. Divide into the four layers in the box, go up the three-layer and be adsorbing material, each layer size is 5cm, and every layer all separates with the division board that has different diameters hole of permeating water of equidimension, and adsorbing material fills with positive formula, and from the top down the filling order does in proper order: 5-8mm of active carbon, 10-15mm of ceramsite and 15-20mm of zeolite, wherein the bottom layer is a planting substrate bottom mud layer, and submerged plants, namely tape grass, are planted and extend out of the box body through a transparent pipe. Four angles in the bottom of the box body are hung with a plurality of bamboo fillers, and the interval of each bamboo ball is 5 cm. In practical application, the removal rates of CODMn, NH3-N, TP and TN before treatment of the polluted river are respectively 88.4%, 84.3%, 66.9% and 58.4% from 79.0mg/L, 9.52mg/L, 4.78mg/L and 15.23mg/L to 9.2mg/L, 1.49mg/L, 1.58mg/L and 6.33 mg/L.

According to the embodiment, the device is mainly used for repairing COD in the water body_MnN, P, thereby solving the problem of water eutrophication, and the selected adsorbing material has strong capability in nitrogen and phosphorus removal. The device can be directly taken out of water by positioning the floating ball without submerging into the water bottom; the invention optimizes the planting substrate and the device structure aiming at whether the aquatic plants can grow healthily, ensures the growth of the plants, gives full play to the effects of the plants and indigenous microorganism factors, and has high survival rate of the plants. The structure of the invention is divided into an upper layer (a plant area), a middle layer (an adsorption material area) and a lower layer (a microorganism enrichment area), and the comprehensive effects of aquatic plants, indigenous microorganisms, environment-friendly adsorption materials, artificial wetlands and the like are integrated, so that the repairing means is more diversified, and the diversity of water organisms is increased.

Claims

1. A movable ecological medium box for restoring eutrophic natural water comprises a box body and a floating ball connected with the box body, wherein the box body is divided into a first packing layer, a second packing layer, a third packing layer and a fourth packing layer from top to bottom through a movable isolation plate; planting matrixes are filled in the fourth packing layer, submerged plants are planted in the planting matrixes, and the submerged plants penetrate through the third packing layer to the first packing layer from bottom to top and extend out of the upper surface of the box body through planting pipes; matrix fillers with different particle sizes are filled in the first to third filler layers, a plurality of bamboo balls are connected below the box body, and the bamboo balls are dense bamboo balls woven by natural moso bamboos and used as fillers; the fourth layer of packing layer is planted with substrate of the bottom mud in the water body to be repaired, the submerged plant is planted in the fourth layer of planting substrate and extends out of the box body through the planting pipe, and the planting pipe is a transparent plastic pipe.

2. The movable ecological medium box for restoring eutrophic natural water body according to claim 1, which is characterized in that: the fillers in the first filler layer to the third filler layer are carried out by adopting a positive grading mode or a reverse grading mode: in the positive grading mode, the first packing layer is filled with activated carbon, the second packing layer is filled with ceramsite, and the third packing layer is filled with zeolite; in the reverse grading mode, zeolite is filled in the first packing layer, ceramsite is filled in the second packing layer, and activated carbon is filled in the third packing layer; in the positive grading mode and the negative grading mode, the particle size of the zeolite is 15-20mm, the particle size of the ceramsite is 10-15mm, and the particle size of the activated carbon is 5-8 mm.

3. The movable ecological medium box for restoring eutrophic natural water body according to claim 1, which is characterized in that: the side wall of the box body where the first to third packing layers are located is uniformly distributed with a plurality of micropores, and the aperture of the micropore of each packing layer is smaller than the diameter of the packing particles.

4. The movable ecological medium box for restoring eutrophic natural water body according to claim 1, which is characterized in that: the packing layers are separated by movable isolation plates with the area smaller than the internal area of the box body, the movable isolation plates are supported in the box body by internal supports, a plurality of through holes are arranged on the movable isolation plates between the first packing layer and the second packing layer and between the second packing layer and the third packing layer, and the aperture of each through hole is smaller than the particle size of the packing in the packing layer on the upper part of the through hole; the box body is provided with a through hole upper cover on the upper end surface of the first packing layer.

5. The movable ecological medium box for restoring eutrophic natural water body according to claim 1, which is characterized in that: the floating ball and the box body are connected with each other through the corrosion-resistant rope, the length of the floating ball and the box body can be adjusted according to the depths of different water bodies, and the sinking and floating depth of the box body is adjusted.

6. The movable ecological medium box for restoring eutrophic natural water body according to claim 1, which is characterized in that: the floater be corrosion-resistant PVC foam floater, and connect on four angles at box top through corrosion-resistant rope.

7. The movable ecological medium box for restoring eutrophic natural water body according to claim 1, which is characterized in that: the box body and the movable isolation plate are made of PVC.

8. The movable ecological medium box for restoring eutrophic natural water body according to claim 1, which is characterized in that: an aeration device is also arranged in the restored water body.