CN109179865B - Device and method for ecological restoration of low dissolved oxygen polluted water body - Google Patents

Device and method for ecological restoration of low dissolved oxygen polluted water body Download PDF

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CN109179865B
CN109179865B CN201811055443.5A CN201811055443A CN109179865B CN 109179865 B CN109179865 B CN 109179865B CN 201811055443 A CN201811055443 A CN 201811055443A CN 109179865 B CN109179865 B CN 109179865B
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dissolved oxygen
ecological
polluted water
water
aerator
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CN109179865A (en
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许明
操家顺
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Hohai University HHU
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/32Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00Aeration of stretches of water

Abstract

The invention discloses a device and a method for ecological restoration of a low dissolved oxygen polluted water body, wherein the device comprises a dissolved oxygen meter, an aerator, a flow velocity determinator, a plug flow stirrer and an ecological purse seine, wherein filter-feeding fishes are thrown in the ecological purse seine and are arranged in the polluted water body; the dissolved oxygen instrument is used together with the aerator, the aerator and the ecological purse net are arranged at intervals, the distance is 10-30 m, and the dissolved oxygen instrument is used for providing dissolved oxygen environmental conditions for filter-feeding fish ecological restoration; the flow velocity measuring instrument is used together with the plug flow stirrer, the plug flow stirrer and the aerator are arranged at intervals, the distance is 20-30 m, and hydrodynamic conditions are provided for filter-feeding fish ecological restoration. The method disclosed by the invention has the advantages of convenience in operation, low operation cost, quickness in taking effect, stable treatment effect and obvious water quality improvement.

Description

Device and method for ecological restoration of low dissolved oxygen polluted water body
Technical Field
The invention belongs to the field of environmental protection and ecological restoration, and particularly relates to a device and a method for ecological restoration of a low dissolved oxygen polluted water body.
Background
With the development of modern industry, the treatment of polluted water bodies becomes more and more important. At present, a great amount of benthic mud-attached algae are promoted to grow and propagate in eutrophic lakes and heavily polluted river channels due to the existence of a great amount of organic pollutants, the number and the biomass of the benthic mud-attached algae are obviously higher than those of floating algae, and the existence of the algae (amphibian oscillatoria and basket algae) can consume a great amount of nutrient substances, but dead corpses of the algae can consume a great amount of dissolved oxygen through the decomposition of microorganisms, generate toxic gas, blacken and stink bottom mud, and cause serious organic pollution. Meanwhile, the large increase of the nutrient salt load in the water body is also one of the important reasons for the eutrophication of the water body.
The related scientific research units in China utilize the released culture of silver carps and bighead carps in lakes to control the outbreak of the blue algae bloom and obtain certain effect. The main pollution source in the heavily polluted river is the pollution of organic matters, and the massive growth and propagation of benthic attached mud algae are the root cause of water quality deterioration. By stopping and breeding the carps, the crucians and the artificially released fancy carps, the content of organic matters in the sediment is reduced, and the generation of black and odorous phenomena is controlled. Therefore, in the treatment of the heavily polluted water, certain filter-feeding fishes with short food chains are bred according to the ecological principle to prey on suspended organic matters in the water, and the method is an effective way for controlling the eutrophication of the water.
The river treatment technology mainly comprises a physical treatment technology, a chemical treatment technology, a biological treatment technology and the like, and some ecological treatment technologies such as an artificial wetland technology and the like are also applied at present, but the ecological treatment technology is not much safe, convenient to control and stable in treatment effect, so that a proper method is needed to solve the ecological environment problem caused by the black and odorous water body.
Application No. 200910059987.3 discloses a method for treating open water pollution, especially a lake pollution treatment technique based on biological manipulation theory. Selecting a target water area to be treated, monitoring the water quality change of the target water area, amplifying and propagating the Rhp strain with the concentration of 2-5 ppm, domesticating, separating and screening Rhp engineering strains meeting the treatment requirement, and carrying out large-scale production according to the Rhp engineering strains to meet the treatment requirement of the target water area. And then, according to a treated target water area, monitoring a background value according to a ground surface environment quality standard, continuously and periodically reducing the Rhp engineering strain which is a preparation produced in a large scale at a concentration of 1-3 ppm, and uniformly throwing the Rhp engineering strain into the target water area. The method can effectively treat the pollution of the open water area, and the blue algae outbreak can be controlled and treated. But the method has poor adaptability to open water body pollution, high operation cost and complex operation.
Application number 201210384262.3 relates to a method for restoring river water quality based on a system coupling mode. The system realizes the organic coupling of a riverbank vegetation belt system, a multifunctional pond system and a riverway beach micro-terrain reconstruction system to form a coupling matching system, has more complex internal organization and more reasonable structure compared with a single subsystem, and has the functions of strengthening the whole function of the system and amplifying the whole benefit of the system; effectively improves the water quality of the river, the structure of the river ecosystem, the quality of the biological habitat and the overall current situation of the ecological environment, enhances the physical, chemical and biological integrity of the river ecosystem, and is a river restoration mode which is 'close to nature, multifunctional, high-efficiency and sustainable'. The water resource is fully utilized to increase economic benefits, and the contradiction between the environmental protection and the economic development of vast rural areas can be effectively relieved. However, the method needs terrain finishing, vegetation recovery and the like, and has the disadvantages of large investment, long period and unstable treatment effect.
Application No. 201210408850.6 campus landscape water quality maintaining and self-purifying system integrating landscape and biological ecological restoration discloses a campus landscape water quality maintaining and self-purifying system integrating landscape and biological ecological restoration, which comprises an artificially strengthened water quality purifying system, a biological control system and a water circulating system, and is used for ecological maintenance and self-purification of campus landscape water. The artificially reinforced water quality purification system achieves the purpose of purifying the water quality of the campus landscape water body by utilizing a water circulation and purification mechanism; the method comprises the following steps: aeration oxygenation system, ecological floating bed and many first combination constructed wetland. The biological control system consists of an ecological island and an aquatic animal and plant system and is used for assisting in artificially strengthening the water quality purification system and further improving the self-purification capacity of the ecological environment of the landscape water body. And the systems and the processing unit are circularly connected by a water pump and a gravity flow. But the method has the advantages of large occupied area of the artificial wetland, poor operation effect in winter and high operation cost.
Application number 201410598660.4 discloses a campus rainwater ecological purification integrated treatment method and an ecological purification integrated system, and the method comprises the following steps: (1) an integrated processing system for processing the campus rainwater is pre-established in the campus; (2) selecting a proper treatment method according to ecological purification of different water bodies in the campus; (3) collecting the rainwater treated in the step (2) into landscape water in the campus, or discharging the rainwater into a campus river channel, or collecting the rainwater into an underground water layer in the campus; the system comprises an undercurrent type artificial wetland system for treating initial rainwater runoff of the campus, a shore belt closure system for treating storm runoff of the campus, an ecological floating bed-aeration plug flow system for treating natural revetment river water, an artificial aquatic plant-micropore aeration system for treating hard revetment river water of the campus, and a biological control-fountain aeration system for treating closed pond water of the campus. But the method has the advantages of large occupied area of the artificial wetland, poor operation effect in winter, complex operation and high operation cost.
Application No. 201510039324.0 discloses a water quality guarantee system for a drinking water reservoir and a guarantee method thereof, wherein an automatic water quality monitoring mechanism, a water inlet regulating and controlling mechanism, a reservoir area water ecology mechanism and a water outlet regulating and controlling mechanism are adopted to treat the quality of raw water flowing into the reservoir from a river channel. The water quality guarantee system of the drinking water reservoir and the guarantee method thereof have wide application range, can play good water quality purification and guarantee roles for the drinking water reservoirs in plain and mountainous areas, have the advantages of high water quality guarantee performance, good water body purification effect and high water supply safety, embody the concepts of ecology, low carbon, environmental protection and the like, have good economy, practicability and wide applicability, and are particularly suitable for being popularized and used in the drinking water reservoirs with unstable raw water quality, long retention time of the water bodies of the reservoirs, eutrophication risk, low water supply guarantee rate and emergency water storage function. But the method has the advantages of large occupied area of the artificial wetland, large investment and high operation cost.
Application No. 201510244868.0 discloses a method for simulating negative effects caused by juvenile fish outbreak in ecological restoration engineering by using filter feeding organisms, which comprises the steps of preparing sediments, preparing lake water, adding corbicula fluminea and carp, starting experiment and sampling, wherein the density of the added corbicula fluminea and carp is designed as corbicula fluminea density treatment: 0. 60 and 180, converted to biomass per unit area: 0. 214g/m2And 643g/m2(ii) a Carp density: 1 tail and 3 tails, converted to biomass per unit area: 4.3g/m2And 12.9g/m2. According to the experimental ecology method adopted by the ecology principle, the negative effect caused by juvenile fish outbreak in the ecological restoration engineering is accurately simulated, filter feeding organisms, namely corbicula fluminea are added by utilizing the biological manipulation principle, and the corbicula fluminea is used for controlling the sediment suspension caused by juvenile fish outbreak of carps and improving the illumination condition of the water body, so that the aim of restoring the eutrophic water body is fulfilled. But the method has poor operation stability, poor adaptation to the conditions of low dissolved oxygen and poor hydrodynamic force and poor operation effect.
Application number 201510311337.9 relates to an in-situ ecological restoration method and system for sewage at sewage outfall of a tidal inland river system, wherein the sewage outfall is guided by a flexible enclosure, an aquatic plant absorption area, an efficient microbial film aerobic reaction area and a facultative anaerobic reaction area are built in a guide channel from top to bottom of the water surface of a water body, the comprehensive efficiency of a biological contact oxidation technology, an efficient biological carrier technology, an efficient microbial technology, a micro aeration technology and a biological manipulation technology is exerted, and the water body is purified through physical precipitation, carrier adsorption, microbial degradation, plant absorption and transfer action and aquatic animal digestion and decomposition action. But the method has the advantages of large occupied area of the artificial wetland, large investment and high operation cost.
Disclosure of Invention
The invention provides a device and a method for ecological restoration of a low dissolved oxygen polluted water body, aiming at the difficult problems of low dissolved oxygen content, poor water body fluidity, more suspended organic matters and low transparency of the polluted water body. The ecological restoration of the xenocypris davidi bleekers is better realized by adopting aeration, plug flow and biological control coupling and building the concentration and flow rate of proper dissolved oxygen, organic matters and nitrogen and phosphorus are reduced, the transparency is improved, and the concentration of the dissolved oxygen is increased.
The invention is realized by the following technical scheme:
a device for ecological restoration of a low dissolved oxygen polluted water body comprises a dissolved oxygen meter, an aerator, a flow velocity tester, a plug flow stirrer and an ecological purse seine, wherein filter-feeding fishes are thrown in the ecological purse seine and are arranged in the polluted water body; the dissolved oxygen instrument is used together with the aerator, the aerator and the ecological purse net are arranged at intervals, the distance is 10-30 m, and the dissolved oxygen instrument is used for providing dissolved oxygen environmental conditions for filter-feeding fish ecological restoration; the flow velocity measuring instrument is used together with the plug flow stirrer, the plug flow stirrer and the aerator are arranged at intervals, the distance is 20-30 m, and hydrodynamic conditions are provided for filter-feeding fish ecological restoration.
Further, the ecological purse seine is made of glass fiber reinforced plastics, the inner diameter of the ecological purse seine is 100-150 cm, the height of the netting is 200-300 cm, the ecological purse seine is made of polyethylene monofilament knotless net, the mesh is 6-8 mm, and the thickness is 4-8 mm; the bottom net is polyethylene net cloth with mesh of 1 mm.
Further, the filter-feeding fishes are xenocypris davidi bleekers, the body length is 20-35 cm, the body weight is 0.10-0.25 g, and the stocking density is 45-55 g/m3The daily ingestion rate of the xenocypris davidi bleekers in the ecological purse net is more than 55%.
Further, when the width of the river channel of the polluted water body is less than or equal to 20m, the aerator is arranged in the middle of the river channel; when the width of the river channel of the polluted water body is more than 20m, the aeration machines are arranged on two sides of the river channel, the layers are arranged, the upper part of the aeration machines is positioned on the water surface, and the lower part of the aeration machines is fixed by adopting wooden piles or ripstones.
Further, when the width of the river channel of the polluted water body is less than or equal to 20m, the plug flow stirrer is arranged in the middle of the river channel; when the width of the river channel of the polluted water body is more than 20m, the plug flow stirrers are arranged on two sides of the river channel and are arranged in layers, the upper parts of the plug flow stirrers are positioned on the water surface, and the lower parts of the plug flow stirrers are fixed by adopting wooden piles or ripstones.
An ecological restoration method based on the device for ecological restoration of the low dissolved oxygen polluted water body comprises the following steps:
step 1) arranging a dissolved oxygen meter in a polluted water body to be treated and combining the dissolved oxygen meter with an aerator, and controlling the aerator to be opened and closed by setting the dissolved oxygen size, thereby providing dissolved oxygen environmental conditions for filter-feeding fish ecological restoration;
step 2) arranging a flow velocity tester in the polluted water body to be treated, combining the flow velocity tester with a plug flow stirrer, and controlling the plug flow stirrer to be opened and closed by setting the flow velocity, thereby providing hydrodynamic conditions for filter-feeding fish ecological restoration;
step 3) putting filter-feeding fishes into the ecological purse seine and arranging the filter-feeding fishes in the polluted water body to be treated; when dissolved oxygen DO is less than 0.3mg/L, the area of the ecological purse seine accounts for 8-15% of the area of the polluted water body; when the dissolved oxygen DO is more than or equal to 0.3mg/L, the area of the ecological purse seine accounts for 5-8% of the area of the polluted water body;
step 4), when the dissolved oxygen DO of the polluted water body is less than 0.3mg/L, the aerator is started; when the DO measured by the dissolved oxygen meter is more than or equal to 0.3mg/L, the aerator is closed;
step 5) when the flow velocity of the polluted water body is less than 0.08m/s as measured by the flow velocity measuring instrument, starting the plug flow stirrer; when the flow velocity of the polluted water body is measured to be more than or equal to 0.08m/s by the flow velocity measuring instrument, the plug flow stirrer is closed;
and step 6), setting the area of the ecological purse seine through the filter feeding fishes put in the ecological purse seine, and opening or closing the aerator and the plug flow stirrer, so that the ecological restoration can be performed on the polluted water body.
Further, the polluted water body to be treatedThe water quality conditions were as follows: the transparency is 10-20 cm, the dissolved oxygen DO is 0-2 mg/L, the total nitrogen content TN is 5-8 mg/L, the total phosphorus content TP is 0.3-0.8 mg/L, NH3The content of-N is 3-5 mg/L.
Compared with the prior art, the invention has the advantages that:
(1) the invention takes biological manipulation as a core, moderately improves the dissolved oxygen and the flow velocity of the water body by aeration, oxygen flushing and plug flow stirring, improves the biological manipulation condition, obviously removes organic debris and nitrogen and phosphorus in the water body, improves the transparency and improves the concentration of the dissolved oxygen, and has the advantages of simple operation, low cost and convenient management.
(2) The invention is suitable for treating the water body with low dissolved oxygen, does not influence flood discharge, does not generate secondary pollution, has good ecological effect and has good application prospect.
(3) The method is mainly characterized in that organic debris is removed, transparency is improved, and dissolved oxygen is improved, a novel water body ecological system is constructed, the self-recovery capacity of the water body is improved, and the water quality of the water body is continuously improved.
Drawings
FIG. 1 is a schematic diagram of the process;
FIG. 2 is a schematic process plan view;
FIG. 3 is a schematic cross-sectional view of a process.
In the figure: 1. a dissolved oxygen instrument; 2. an aerator; 3. a flow rate meter; 4. a plug flow agitator; 5. xenocypris davidi bleeker; 6. an ecological purse net.
Detailed Description
The technical scheme of the invention is further described by combining the drawings and the embodiment.
Example 1
A device for ecological restoration of a low dissolved oxygen polluted water body is shown in figures 2 and 3 and comprises a dissolved oxygen meter 1, an aerator 2, a flow velocity measuring instrument 3, a plug flow stirrer 4 and an ecological purse seine 6, wherein filter feeding fishes (xenocypris davidi bleekers 5) are thrown in the ecological purse seine 6 and are arranged in the polluted water body; the dissolved oxygen instrument 1 and the aerator 2 are used together, and the aerator 1 and the ecological purse seine 6 are arranged at intervals with the distance of 10-30 m and are used for providing dissolved oxygen environmental conditions for filter-feeding fish ecological restoration; the flow velocity measuring instrument 3 is used together with the plug flow stirrer 4, and the plug flow stirrer 4 and the aerator 2 are arranged at intervals with a distance of 20-30 m and used for providing hydrodynamic conditions for filter-feeding fish ecological restoration.
When the width of the river channel of the polluted water body is less than or equal to 20m, the aerator 2 is arranged in the middle of the river channel; when the width of the river channel of the polluted water body is more than 20m, the aeration machines 2 are arranged on two sides of the river channel and are arranged in layers, the upper parts of the aeration machines are positioned on the water surface, and the lower parts of the aeration machines are fixed by adopting wooden piles or ripstones.
When the width of the river channel of the polluted water body is less than or equal to 20m, the plug flow stirrer 4 is arranged in the middle of the river channel; when the width of the river channel of the polluted water body is more than 20m, the plug flow stirrers 4 are arranged on two sides of the river channel and are arranged in layers, the upper parts of the plug flow stirrers are positioned on the water surface, and the lower parts of the plug flow stirrers are fixed by adopting wooden piles or ripstones.
When dissolved oxygen DO is less than 0.3mg/L, the area of the ecological purse seine accounts for 8-15% of the area of the polluted water body; when the DO is more than or equal to 0.3mg/L, the area of the ecological purse seine accounts for 5-8% of the area of the polluted water body.
The process schematic diagram of the ecological restoration method based on the device is shown in figure 1. The method comprises the following specific steps:
the length of a polluted river channel is 2.3km, dissolved oxygen DO is 0.2mg/L, and the flow rate of the water body is 0.10 m/s. The surrounding of the river channel is mainly provided with resident domestic sewage, the turbidity of the water body is larger, main pollutants of the water body comprise total nitrogen, total phosphorus and the like, and the water quality of the river is generally in a poor V class.
The xenocypris davidi bleekers 5 are placed in the ecological purse seine 6 and are arranged in the polluted water body to be treated; the ecological purse seine 6 is made of glass fiber reinforced plastic, the inner diameter is 100-150 cm, the height of the netting is 200-300 cm, the ecological purse seine is made of polyethylene monofilament knotless net, the mesh is 6-8 mm, and the thickness is 4-8 mm; the bottom net is polyethylene net cloth with mesh of 1 mm. The area of the ecological purse net accounts for about 9 percent of the area of the polluted water body under the condition of low dissolved oxygen (DO is less than 0.3 mg/L). And 2, arranging an aerator for aeration and oxygen flushing. The impeller agitator was in the off state.
The xenocypris davidi bleeker 5 is filter-feeding fishes, the body length is 20-35 cm, the weight is 0.10-0.25 g, the stocking density is 480-550 per square, and the stocking density is about 45-55 g/m3Yellow to yellowThe daily ingestion rate of xenocypris davidi bleekers 5 in the ecological purse net 6 is more than 55%.
After two months of treatment, the water quality before and after treatment is shown in Table 1.
TABLE 1 example 1 Water quality before and after treatment
Example 2
Otherwise, as in example 1, dissolved oxygen DO was 0.5mg/L and the flow rate of the water was 0.10 m/s. The aerator and the plug flow agitator are set to be not operated. The area of the ecological purse net accounts for about 7 percent of the area of the polluted water body.
After two months of treatment, the water quality before and after treatment is shown in Table 2.
TABLE 2 example 2 Water quality before and after treatment
Example 3
Otherwise, as in example 1, dissolved oxygen DO was 0.2mg/L and the flow rate of the water was 0.05 m/s. The aerator and the plug flow agitator are started. The area of the ecological purse net accounts for about 10 percent of the area of the polluted water body.
After two months of treatment, the water quality before and after treatment is shown in Table 3.
TABLE 3 Water quality before and after treatment in example 3
Example 4
Otherwise, as in example 1, dissolved oxygen DO was 0.5mg/L and the flow rate of the water was 0.05 m/s. And (5) turning on the plug flow stirrer when the aerator does not operate. The area of the ecological purse net accounts for about 7 percent of the area of the polluted water body.
After two months of treatment, the water quality before and after treatment is shown in Table 4.
TABLE 4 example 4 Water quality before and after treatment
The present invention has been described in terms of the above embodiments, and it should be understood that the above embodiments are not intended to limit the present invention in any way, and all technical solutions obtained by using equivalents or equivalent changes are within the protection scope of the present invention.

Claims (4)

1. A device for ecological restoration of a low dissolved oxygen polluted water body is characterized by comprising a dissolved oxygen instrument, an aerator, a flow velocity tester, a plug flow stirrer and an ecological purse net, wherein filter feeding fishes are thrown in the ecological purse net and are arranged in the polluted water body; the dissolved oxygen instrument is used together with the aerator, the aerator and the ecological purse net are arranged at intervals, the distance is 10-30 m, and the dissolved oxygen instrument is used for providing dissolved oxygen environmental conditions for filter-feeding fish ecological restoration; the flow velocity measuring instrument is used together with the plug flow stirrer, the plug flow stirrer and the aerator are arranged at intervals, the distance is 20-30 m, and hydrodynamic conditions are provided for filter-feeding fish ecological restoration; the filter-feeding fishes are xenocypris davidi bleekers, the body length is 20-35 cm, the weight is 0.10-0.25 g, and the stocking density is 45-55 g/m3The daily ingestion rate of the xenocypris davidi bleekers in the ecological purse net is more than 55%;
when the width of the river channel of the polluted water body is less than or equal to 20m, the aerator is arranged in the middle of the river channel; when the width of the river channel of the polluted water body is more than 20m, the aerators are arranged on two sides of the river channel and are symmetrically arranged, the upper parts of the aerators are positioned on the water surface, and the lower parts of the aerators are fixed by adopting wooden piles or ripstones;
when the width of the river channel of the polluted water body is less than or equal to 20m, the plug flow stirrer is arranged in the middle of the river channel; when the width of the river channel of the polluted water body is more than 20m, the plug flow stirrers are arranged on two sides of the river channel and are symmetrically arranged, the upper parts of the plug flow stirrers are positioned on the water surface, and the lower parts of the plug flow stirrers are fixed by adopting wooden piles or ripstones.
2. The device for the ecological restoration of the water body with low dissolved oxygen pollution according to claim 1, wherein the ecological purse seine is made of glass fiber reinforced plastics, has an inner diameter of 100-150 cm and a net height of 200-300 cm, is made of polyethylene monofilament knotless net, and has a mesh size of 6-8 mm and a thickness of 4-8 mm; the bottom net is polyethylene net cloth with mesh of 1 mm.
3. An ecological restoration method based on the device for ecological restoration of the low dissolved oxygen polluted water body in claim 1, characterized by comprising the following steps:
step 1) arranging a dissolved oxygen meter in a polluted water body to be treated and combining the dissolved oxygen meter with an aerator, and controlling the aerator to be opened and closed by setting the dissolved oxygen size, thereby providing dissolved oxygen environmental conditions for filter-feeding fish ecological restoration;
step 2) arranging a flow velocity tester in the polluted water body to be treated, combining the flow velocity tester with a plug flow stirrer, and controlling the plug flow stirrer to be opened and closed by setting the flow velocity, thereby providing hydrodynamic conditions for filter-feeding fish ecological restoration;
step 3) putting filter-feeding fishes into the ecological purse seine and arranging the filter-feeding fishes in the polluted water body to be treated; when dissolved oxygen DO is less than 0.3mg/L, the area of the ecological purse seine accounts for 8-15% of the area of the polluted water body; when the dissolved oxygen DO is more than or equal to 0.3mg/L, the area of the ecological purse seine accounts for 5-8% of the area of the polluted water body;
step 4), when the dissolved oxygen DO of the polluted water body is less than 0.3mg/L, the aerator is started; when the DO measured by the dissolved oxygen meter is more than or equal to 0.3mg/L, the aerator is closed;
step 5) when the flow velocity of the polluted water body is less than 0.08m/s as measured by the flow velocity measuring instrument, starting the plug flow stirrer; when the flow velocity of the polluted water body is measured to be more than or equal to 0.08m/s by the flow velocity measuring instrument, the plug flow stirrer is closed;
and step 6), setting the area of the ecological purse seine through the filter feeding fishes put in the ecological purse seine, and opening or closing the aerator and the plug flow stirrer, so that the ecological restoration can be performed on the polluted water body.
4. The ecological restoration method according to claim 3, wherein the water quality of the polluted water to be treated is as follows: the transparency is 10-20 cm, the dissolved oxygen DO is 0-2 mg/L, the total nitrogen content TN is 5-8 mg/L, the total phosphorus content TP is 0.3-0.8 mg/L, NH3The content of-N is 3-5 mg/L.
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