CN116253441A - Multi-pond wetland submerged plant recovery method - Google Patents
Multi-pond wetland submerged plant recovery method Download PDFInfo
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- CN116253441A CN116253441A CN202310338395.5A CN202310338395A CN116253441A CN 116253441 A CN116253441 A CN 116253441A CN 202310338395 A CN202310338395 A CN 202310338395A CN 116253441 A CN116253441 A CN 116253441A
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
Abstract
The application relates to the technical field of submerged plant recovery, and discloses a submerged plant recovery method for a multi-pond wetland, which comprises the following steps: s1, repairing a substrate sludge habitat, uniformly adding a substrate improvement material into a pond, improving the substrate sludge ecological environment, wherein the coverage thickness is 5-10 cm; s2, improving transparency of the water body, slowing down flow velocity of the water flow when water is added into the pond, increasing sedimentation of water body particles, and reducing the water level of the pond through a water level adjusting device at the initial stage of planting so that illumination can enter the water bottom; s3, increasing dissolved oxygen in the water body, and aerating a mud-water interface by adopting an aeration device; s4, planting submerged plants, spreading the substrate improvement material for 2-3 days, and planting pollution-resistant emergent aquatic plants and submerged plants in the coverage area of the substrate improvement material. The method has the effects of promoting the recovery of submerged plants and further accelerating the recovery and healthy development of the eutrophic lake and river ecosystem.
Description
Technical Field
The application relates to the technical field of submerged plant recovery, in particular to a method for recovering submerged plants in a multi-pond wetland.
Background
The domestic inland freshwater fishery mainly breeds very good species such as micropterus salmoides, snakeheads, pelteobagrus fulvidracos, loaches and erythroculter ilishaeformis, the breeding mode mainly adopts scattered households for continuous-sheet type traditional breeding, and the problems of rough breeding mode, too high breeding density and the like exist, and as a result, a large amount of residual baits, the balance of aquatic animal excrement and some aquatic plants are damaged to cause nitrogen and phosphorus pollution of the breeding water body, and serious environmental problems such as eutrophication of surrounding water body and the like are caused. The recovery and reconstruction of the water ecological system is one of the main contents of the ecological restoration of the eutrophic water body.
The final aim of the ecological restoration of the eutrophic water body is to construct a good ecological system. And a good ecological system is constructed, so that the submerged plant community can be quickly recovered. Almost all relevant scholars and experts consider that the submerged plants have great effect in the ecological restoration of the water body, the submerged plants can absorb rich nutrient components such as nitrogen, phosphorus and the like and promote the sedimentation of suspended matters in the water in the growth process, dissolved oxygen in the water can be increased through photosynthesis, the water quality is purified, the number of microorganisms in the water is increased to reduce the eutrophication degree of the water body, and meanwhile, the submerged plants provide healthier living habitat and hidden places for the aquatic animals, so that the whole water ecological system is improved. Therefore, in a water body with serious eutrophication, planting submerged plants is one of the most main means for recovering and rebuilding the water ecosystem.
However, in the process of implementing the related technical scheme, at least the following technical problems are found: the growth and distribution of submerged plants are regulated and stressed by a plurality of environmental factors, such as light, water transparency, hard substrate, nutrient salt, stormy waves and the like, and among the environmental factors, the transparency and light of water bodies are most obvious for the environmental stress of the submerged plants. The environment of the polluted water body sediment is not suitable for the growth of aquatic plants, the submerged plants are often in a serious anoxic state, the transparency of the water body is reduced, the submerged plants are gradually dead due to insufficient illumination and cannot perform normal photosynthesis and respiration, and finally, the submerged plant group is in the water and cannot be settled.
Disclosure of Invention
The method solves the problems that the environment of the polluted water body sediment is not suitable for the growth of aquatic plants, the submerged plants are often in a serious anoxic state, the transparency of the water body is reduced, the submerged plants are also gradually dead due to insufficient illumination and cannot perform normal photosynthesis and respiration, and finally the submerged plants cannot settle under water, and the problem that the submerged plants can not settle under water is solved.
The application provides a multi-pond wetland submerged plant recovery method, which comprises the following steps: s1, repairing a substrate sludge habitat, uniformly adding a substrate improvement material into a pond, improving the substrate sludge ecological environment, wherein the coverage thickness is 5-10 cm; s2, improving transparency of the water body, slowing down flow velocity of the water flow when water is added into the pond, increasing sedimentation of water body particles, and reducing the water level of the pond through a water level adjusting device at the initial stage of planting so that illumination can enter the water bottom; s3, increasing dissolved oxygen in the water body, and aerating a mud-water interface by adopting an aeration device; s4, planting submerged plants, spreading the substrate improvement material for 2-3 days, and planting pollution-resistant emergent aquatic plants and submerged plants on the coverage area of the water substrate improvement material.
Further, the substrate improvement material is prepared from the following raw materials in percentage by mass: 60% -70% of modified biochar; 10% -20% of zeolite; 20-30% of binder.
Furthermore, the pollution-resistant emergent aquatic plant is one or a combination of more of arrowhead, amaranth and glossopus anatipestifer.
Further, the sewage-resistant submerged plant is one or a combination of more of kucao, black algae, foxtail algae and gynura segetum.
Further, water level adjustment device includes backup pad, spool, stay cord, counter weight ring, bellows, drain pipe and location adjustment mechanism, the backup pad overlap joint is in the up end of pond, the spool rotates to be installed in the up end of backup pad, the one end of stay cord is fixed in on the global of spool, the other end of stay cord passes the backup pad and is connected with the counter weight ring, the counter weight ring is fixed in the up end of bellows, drain pipe one end and the lower extreme intercommunication of bellows, the other end of drain pipe passes the pond and extends to the pond outside, location adjustment mechanism includes measuring stick, pointer, the lower extreme of measuring stick passes the backup pad and is fixed with the counter weight ring, measuring stick and backup pad sliding fit, the pointer is fixed in the backup pad upper end, the one end of pointer is laminated with the global of measuring stick.
Further, a through hole is formed in the supporting plate, a plurality of ball grooves are formed in the hole wall of the through hole, balls are rotationally connected in the ball grooves, the measuring rod penetrates through the through hole, and the balls are in rolling fit with the peripheral surface of the measuring rod.
Further, the upper end face of the counterweight ring is provided with a threaded hole, and an external thread matched with the threaded hole is tapped on the peripheral face of the measuring rod and at a position close to the lower end.
Further, two fixing blocks are arranged on the supporting plate at intervals, two ends of the scroll are inserted into the two fixing blocks respectively and are in running fit with the fixing blocks, bolts are connected to the fixing blocks in a threaded mode, and the bolts penetrate through the fixing blocks to be in sliding fit with the peripheral face of the scroll.
Further, aeration equipment includes nanometer micropore aeration pipe, roots variable frequency air-blower, oxidation reduction potential automatic monitor, programmable logic controller, micropore aeration pipe sets up in the pond bottom, roots variable frequency air-blower sets up in the pond outside, and roots variable frequency air-blower passes through the rubber tube with micropore aeration pipe and be connected, oxidation reduction potential automatic monitor installs in the position department between upper water and the bottom mud top layer, oxidation reduction potential automatic monitor passes through programmable logic controller and roots variable frequency air-blower electric connection.
Further, the microporous aerator pipe is internally provided with silver-loaded zeolite.
The technical scheme provided in the application has at least the following technical effects or advantages:
1. due to the adoption of the steps of repairing the substrate sludge habitat, improving the transparency of the water body, increasing the dissolved oxygen of the water body, planting submerged plants and the like, the substrate improvement material coverage and plant planting repair are combined, the defects of the substrate sludge habitat can be overcome, the substrate sludge environment can be effectively improved for a long time, aquatic ecology is recovered, the problem that the serious pollution water body substrate sludge environment is not suitable for the growth of aquatic plants in the prior art is effectively solved, the submerged plants are often in a serious anoxic state, the transparency of the water body is reduced, the submerged plants cannot be subjected to normal photosynthesis and respiration to die gradually because of insufficient illumination, and finally, the problem that the submerged plants cannot be colonized under water is realized.
2. Due to the adoption of the water level adjusting device, the problem of low transparency of the water body in the prior art is effectively solved, and further the water level is conveniently and automatically adjusted, and the transparency of the water body is improved.
Drawings
FIG. 1 is a flowchart of a multi-pond wetland submerged plant recovery in an embodiment of the present application;
fig. 2 is a schematic structural view of a water level adjusting device in an embodiment of the present application;
FIG. 3 is a schematic structural view of a positioning adjustment mechanism according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a sludge-water interface redox potential control device according to an embodiment of the present application;
in the figure: 1. a water level adjusting device; 11. a support plate; 111. a through hole; 112. a ball groove; 12. a reel; 121. a fixed block; 122. a bolt; 13. a pull rope; 14. a counterweight ring; 15. a bellows; 16. a drain pipe; 17. a positioning adjusting mechanism; 171. a measuring rod; 172. a pointer; 18. a ball; 2. an aeration device; 21. microporous aeration pipes; 22. roots variable frequency blower; 23. an automatic oxidation-reduction potential monitor; 24. a programmable logic controller; 3. and a surface layer bottom mud sampling tube.
Detailed Description
The embodiment of the application discloses a multi-pond wetland submerged plant restoration method, which is reasonably arranged by restoring the sediment habitat, improving the transparency of water, increasing the dissolved oxygen of water, planting submerged plants and the like, improves the black and odorous sediment habitat, improves the main environmental factors influencing the growth of the submerged plants, promotes the restoration of the submerged plants, and further accelerates the restoration and healthy development of an eutrophic lake and river ecosystem.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Referring to fig. 1, 2, 3 and 4, a multi-pond wetland submerged plant restoration method comprises the steps of:
s1, repairing the substrate sludge habitat, uniformly adding a substrate improvement material into the pond, improving the substrate sludge ecological environment, and covering the substrate sludge ecological environment with the thickness of 5-10 cm. The raw materials of the substrate modifying material used in the embodiment of the application are all environment-friendly materials, no chemical reagent is added, and the substrate modifying material is cheap and easy to obtain.
The substrate improvement material is prepared from the following raw materials in percentage by mass: 60-70% of modified biochar, 10-20% of zeolite and 20-30% of binder.
The preparation method of the substrate modifying material comprises the following steps:
(1) Uniformly mixing the modified biochar, zeolite and binder according to the mass percentage, adding water accounting for 20-25% of the mass of the mixture, hardening the mixture paste for 24 hours, and immersing the mixture paste into a water body for maintenance for 3 days. The modified biochar is clay/biochar obtained by loading clay on the surface of the biochar. The binder is Portland cement.
(2) Crushing and screening the composite after curing in the step (1) to obtain the substrate modified material with the particle size of 3-5 mm.
The preparation of the modified biochar comprises the following steps:
a) Crushing moso bamboo, cutting into particles with the length of 2cm multiplied by 2cm, washing with deionized water for 2-3 times, and drying at 60 ℃ for 5 hours.
b) And adding the dried phyllostachys pubescens particles into the clay suspension, and stirring by a stirrer to obtain a phyllostachys pubescens particle-clay mixture, wherein the stirring time is 2 hours. The mixture was dried at 80℃for 24h. The clay is montmorillonite. The mass ratio of the phyllostachys pubescens particles to the clay is 5:1.
c) And placing the dried mixture in an atmosphere furnace for carbonization, wherein the carbonization temperature is 460 ℃. Wherein, the atmosphere furnace is filled with a protective gas, and the protective gas is nitrogen. Raising the temperature to 400-500 ℃ by raising the temperature to 15-30 ℃ per minute, and keeping the residence time for 2h to obtain the clay-loaded biochar.
d) Grinding and sieving the clay-loaded biochar to a granularity of 0.5-1 mm.
The clay contains a plurality of major elements and trace elements beneficial to plant growth, and can promote plant growth. The biochar is rich in organic matters and can provide a nutrient source for the initial growth of plants. The zeolite has porous property, can release air to improve the redox environment of the bottom water body and the surface layer bottom mud, and provides favorable habitat conditions for plant growth. The substrate improvement material can effectively inhibit the release of the bottom mud nitrogen and phosphorus nutrient salt and organic pollutants, improve the bottom mud ecology and provide a good ecological environment for benthos.
S2, improving the transparency of the water body, wherein the flow speed is reduced by reducing the flow speed of the water flow, namely, when water is added into the pond in the later period, the flow speed is controlled, and the sedimentation of water body particles is increased, so that the transparency of the water body is improved.
When the water level is controlled, the light compensation depth can be used as a critical index for the growth of submerged plants, and the submerged plants can normally germinate and grow only when the actual water depth is less than or equal to the light compensation depth, which is also the lowest boundary condition for the recovery of the submerged plants in ecological engineering. The light compensation depth is directly related to the transparency of the water body and the underwater illumination intensity. The relationship between the underwater illumination intensity and the water depth can be described by beer's law:
I h ＝I O e -kh
wherein I is h I is the illumination intensity when the water depth is h O K is the vertical attenuation coefficient of light in the water body, and k is the illumination intensity of the water surface.
In the case of aquatic determination, the transparency is an important parameter affecting the light compensation depth, and the transparency of the water body is controlled to be 0.6-0.8 times of the light compensation depth of the submerged plant. The light compensation point data of different submerged plants are combined, and the general submerged plant water depth control parameters are as follows: 0.5 to 1.0m of goldfish algae; 0.5m to 2.0m of kucao; the aquatic product of the leaf-black algae is controlled to be about 0.5 m.
Under the condition of higher water inflow particles, the blocking dam and the diversion facilities can be arranged, the blocking effect is achieved by combining the emergent aquatic plants planted in the water inflow rapid flow area, the flow velocity of water is slowed down, the sedimentation rate of water particles is increased, and therefore transparency is improved. At the initial stage of planting, the water level of the multi-pond wetland is reduced, so that illumination can enter the water bottom, and photosynthesis of submerged plants is facilitated.
Referring to fig. 2 and 3, the water level adjusting device 1 includes a support plate 11, a reel 12, a pull rope 13, a counterweight ring 14, a bellows 15, a drain pipe 16 and a positioning adjusting mechanism 17, wherein the support plate 11 is lapped on the upper end surface of a pond, the reel 12 is rotatably mounted on the upper end surface of the support plate 11, specifically, two fixing blocks 121 arranged at intervals are fixedly mounted on the support plate 11, two ends of the reel 12 are respectively inserted into the two fixing blocks 121 and are in rotary fit with the fixing blocks 121, bolts 122 are connected to the fixing blocks 121 in a threaded manner, the bolts 122 penetrate through the fixing blocks 121 to be in sliding fit with the peripheral surface of the reel 12, and torsion springs are connected to the joints of the reel 12 and the fixing blocks 121. One end of a pull rope 13 is fixed on the peripheral surface of the reel 12, the other end of the pull rope 13 penetrates through the supporting plate 11 to be connected with the counterweight ring 14, and the pull rope 13 is in sliding fit with the supporting plate 11. The weight ring 14 is fixed to the upper end face of the bellows 15. One end of the drain pipe 16 is communicated with the lower end of the corrugated pipe 15, and the other end of the drain pipe 16 penetrates the pond and extends to the outside of the pond.
The positioning and adjusting mechanism 17 comprises a measuring rod 171 and a pointer 172, the upper end of the measuring rod 171 is located above the supporting plate 11, the lower end of the measuring rod 171 penetrates through the supporting plate 11 and is fixedly connected with the counterweight ring 14 in a threaded mode, a threaded hole is formed in the upper end face of the counterweight ring 14, and external threads matched with the threaded hole are tapped on the peripheral face of the measuring rod 171 and the position close to the lower end. Moreover, the supporting plate 11 is provided with a through hole 111, the hole wall of the through hole 111 is provided with a plurality of ball grooves 112, at least two ball grooves 112 are arranged, the ball grooves 112 are rotationally connected with the balls 18, the measuring rod 171 passes through the through hole 111, the balls 18 are in rolling fit with the peripheral surface of the measuring rod 171, and the friction force of the measuring rod 171 when moving along the supporting rod is reduced. The pointer 172 is fixed to the upper end of the support plate 11, one end of the pointer 172 is attached to the peripheral surface of the measuring rod 171, and the current water level can be measured by changing the relative position between the measuring rod 171 and the pointer 172.
When the water level in the pond rises, the supporting plate 11 rises along with the rise of the water level, the reel 12 rotates at the moment, the pull rope 13 is unfolded, the pull rope 13 is lengthened, the supporting plate 11 is far away from the counterweight ring 14, the measuring rod 171 and the pointer 172 are relatively displaced, and the water level is measured. When the water level of the pond rises, excess water is discharged through the bellows 15, but the discharge speed is limited, i.e. the water discharge flow is limited. When a great amount of water is input in the form of storm or other forms, the supporting plate 11 can rise greatly, and at the moment, the excessive water can be discharged from the drain pipe 16 through the corrugated pipe 15, and along with the falling of the water level at the back, the supporting plate 11 is restored to the original position under the action of the counterweight ring 14, so that the water level adjustment is completed. The water level adjusting device 1 in the embodiment of the application can set the upper limit of the water level, thereby realizing flexible control on the water level.
S3, increasing dissolved oxygen in the water body, and aerating the mud-water interface by adopting an aeration device 2.
Referring to fig. 4, the aeration device 2 comprises a nano microporous aeration pipe 21, a roots variable frequency blower 22, an oxidation-reduction potential automatic monitor 23 and a programmable logic controller 24, and the conventional aeration is considered to cause the increase of the flow rate of water flow, and the sediment is disturbed, so that the growth of submerged plants is influenced, and the transparency of water is also influenced. The embodiment of the application adopts the nano microporous aeration pipe 21 to aerate the mud-water interface, so as to improve the Dissolved Oxygen (DO) level of the mud-water interface, and further improve the oxidation-reduction potential of the surface layer sediment. The microporous aeration pipes 21 are fixedly arranged at the bottom of the pond, the bottom of the pond is fixedly provided with a fixed disc, the microporous aeration pipes 21 are wound on the fixed disc to form a plurality of concentric and spaced annular aeration pipes, and the distance between adjacent nano microporous aeration pipes 21 in the fixed disc is 3-5 cm. The microporous aerator pipe 21 contains silver-loaded zeolite, and has an antibacterial agent and an algicide on its surface. The Roots variable frequency blower 22 is arranged on the outer side of the pond, the Roots variable frequency blower 22 is connected with the microporous aeration pipe 21 through a long rubber pipe, and the oxidation-reduction potential automatic monitor 23 is arranged at the position between the overlying water and the bottom mud surface layer and detects the dynamic change of the oxidation-reduction potential of the mud-water section in real time. The oxidation-reduction potential automatic monitor 23 is electrically connected with the Roots variable frequency blower 22 through the programmable logic controller 24, and the aeration amount of the Roots variable frequency blower 22 is adjusted in real time, so that precise aeration is realized, and the oxidation-reduction potential of the mud-water section is kept between-100 mV and-30 mV. Compared with the traditional aeration method, the microporous aeration method adopted by the embodiment of the application has the advantages of long bubble residence time, high oxygenation efficiency, small interference on surface sediment, low aeration energy consumption and the like. The side wall of the pond is fixedly provided with a surface layer bottom mud sampling pipe 3 communicated with the interior of the pond, the bottom mud is collected through the surface layer bottom mud sampling pipe 3, and the properties of the bottom mud are analyzed to judge the nutrient and pollution conditions of the pond, so that a basis is provided for subsequent work.
S4, planting submerged plants, spreading the substrate improvement material for 2-3 days, and planting pollution-resistant emergent aquatic plants and submerged plants on the coverage area of the water substrate improvement material.
The pollution-resistant emergent aquatic plant is one or a combination of more of arrowhead, amaranth and herba Hedyotidis Diffusae. The anti-fouling submerged plant is one or more of herba Sonchi Oleracei, sargassum Nigri, sargassum foxtail, and herba Eichhorniae. The combined planting of emergent aquatic plants and submerged plants not only can effectively reduce the pollution of bottom mud nitrogen, phosphorus and the like and purify the overlying water body, but also can play a role in beautifying the river landscape due to the ornamental value of the plants.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art, within the scope of the present application, should apply to the present application, and all equivalents and modifications as fall within the scope of the present application.
Claims (10)
1. The method for recovering the submerged plants in the multi-pond wetland is characterized by comprising the following steps of:
s1, repairing a substrate sludge habitat, uniformly adding a substrate improvement material into a pond, improving the substrate sludge ecological environment, wherein the coverage thickness is 5-10 cm;
s2, improving transparency of the water body, reducing flow velocity of the water flow when water is added into the pond, increasing sedimentation of water body particles, and reducing the water level of the pond through a water level adjusting device (1) at the initial stage of planting so that illumination can enter the water bottom;
s3, increasing dissolved oxygen in the water body, and aerating a mud-water interface by adopting an aeration device (2);
s4, planting submerged plants, spreading the substrate improvement material for 2-3 days, and planting pollution-resistant emergent aquatic plants and submerged plants in the coverage area of the substrate improvement material.
2. The method for recovering submerged plants in a multi-pond wetland according to claim 1, wherein the substrate improvement material is prepared from the following raw materials in mass fraction:
60% -70% of modified biochar;
10% -20% of zeolite;
20-30% of binder.
3. The method for recovering submerged plants in a multi-pond wetland of claim 1, wherein said pollution-resistant emergent aquatic plant is one or more of arrowhead, amaranth, and glossoside.
4. The method for recovering submerged plants in a multi-pond wetland of claim 1, wherein said submerged plants are one or more of the group consisting of kucao, black algae, foxtail algae and gynura segetum.
5. A method for recovering submerged plants in a multi-pond wetland according to claim 1, wherein the water level adjusting device (1) comprises a supporting plate (11), a reel (12), a pull rope (13), a counterweight ring (14), a corrugated pipe (15), a drain pipe (16) and a positioning adjusting mechanism (17),
the support plate (11) is lapped on the upper end face of the pond, the scroll (12) is rotatably arranged on the upper end face of the support plate (11), one end of the pull rope (13) is fixed on the peripheral face of the scroll (12), the other end of the pull rope (13) penetrates through the support plate (11) to be connected with the counterweight ring (14), the counterweight ring (14) is fixed on the upper end face of the corrugated pipe (15), one end of the drain pipe (16) is communicated with the lower end of the corrugated pipe (15), the other end of the drain pipe (16) penetrates through the pond and extends to the outer side of the pond,
the positioning adjusting mechanism (17) comprises a measuring rod (171) and a pointer (172), wherein the lower end of the measuring rod (171) penetrates through the supporting plate (11) and is fixed with the counterweight ring (14), the measuring rod (171) is in sliding fit with the supporting plate (11), the pointer (172) is fixed at the upper end of the supporting plate (11), and one end of the pointer (172) is attached to the peripheral surface of the measuring rod (171).
6. The method for recovering submerged plants in a multi-pond wetland according to claim 5, wherein the supporting plate (11) is provided with a through hole (111), the wall of the through hole (111) is provided with a plurality of ball grooves (112), the ball grooves (112) are rotationally connected with balls (18), the measuring rod (171) passes through the through hole (111), and the balls (18) are in rolling fit with the peripheral surface of the measuring rod (171).
7. The method for recovering submerged plants in a multi-pond wetland according to claim 5, wherein the upper end surface of the counterweight ring (14) is provided with a threaded hole, and the peripheral surface of the measuring rod (171) is provided with external threads matched with the threaded hole at a position close to the lower end.
8. The method for recovering submerged plants in a multi-pond wetland according to claim 5, wherein two fixing blocks (121) are arranged on the supporting plate (11) at intervals, two ends of the scroll (12) are respectively inserted into the two fixing blocks (121) and are in running fit with the fixing blocks (121), bolts (122) are connected to the fixing blocks (121) in a threaded mode, and the bolts (122) penetrate through the fixing blocks (121) to be in sliding fit with the peripheral surface of the scroll (12).
9. The method for recovering submerged plants in a multi-pond wetland according to claim 1, wherein the aeration device (2) comprises a nano microporous aeration pipe (21), a Roots variable frequency blower (22), an automatic oxidation-reduction potential monitor (23) and a programmable logic controller (24),
the microporous aeration pipe (21) is arranged at the bottom of the pond, the Roots variable frequency air blower (22) is arranged at the outer side of the pond, the Roots variable frequency air blower (22) is connected with the microporous aeration pipe (21) through a rubber pipe, the oxidation-reduction potential automatic monitor (23) is arranged at the position between the overlying water and the surface layer of the bottom mud, and the oxidation-reduction potential automatic monitor (23) is electrically connected with the Roots variable frequency air blower (22) through the programmable logic controller (24).
10. A method for recovering submerged plants in a multi-pond wetland according to claim 9, characterized in that said microporous aeration pipe (21) is provided with silver loaded zeolite.
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