Biological filtering and purifying device for eutrophic water body
By setting up a mussel filter feeding device in the eutrophic water body, the problem of removing algae and nutrients in the water body is solved, and the water quality improvement and ecosystem purification effects are achieved.
Patent Information
- Application Number
- CN202322163460.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-08-11
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2033-08-11
AI Technical Summary
The prior art is difficult to effectively remove algae and nutrients from eutrophied water bodies, resulting in water pollution and impaired ecosystem functions.
Design a kind of nutrient -rich water biological filtering and purification device, using river mussels for filtering, and setting a breeding cage through floating bodies on the water surface, hanging river mussels to make the algae and nutrients in water filtering water.
Effectively reduce the content of water algae density and nutrients such as nitrogen, phosphorus, improve water quality, reduce the degree of water nutrientization, and improve the water purification function of the water ecosystem.
Smart Images
Figure CN222382447U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a eutrophic water biological filtering and purifying device, in particular to an aquatic biological breeding device which can take river clams as the main body, and belongs to the technical field of water environment protection. Background Art
[0002] There are physical, chemical and biological methods for algae removal, but they must be salvaged manually first, which not only consumes a lot of financial and material resources, but also has great repetitiveness and certain risks. Because salvaging blue algae is an emergency measure, only the blue algae that are temporarily accumulated on the water surface are salvaged. In addition, a secondary algae-water separation is required after salvage, and the water content of the separated algae mud is still above 85%. If the algae mud is stored nearby, it will have adverse visual and olfactory effects after decay, and there is even a risk of secondary pollution of the leachate flowing into the surrounding water bodies, causing environmental impacts on the regional air, water, soil and landscape, so it is not feasible.
[0003] Studies have shown that silver carp and bighead carp can be used for biological control of eutrophic water bodies. Although silver carp and bighead carp consume 40 kg of algae for every kg of growth, their filter-feeding digestion rate of algae is too low, only 25-30%, and their excrement will further increase the eutrophication of water bodies. Therefore, from the perspective of building and improving the structure and function of aquatic ecosystems, it is necessary to further improve the biological structure of aquatic ecosystems.
[0004] The filtering effect of river mussels can effectively remove plankton, suspended matter and organic matter in the water, thereby reducing nutrients and harmful substances in the water and improving water quality. In addition, river mussels can also absorb nutrients such as nitrogen and phosphorus in the water, thereby reducing the degree of eutrophication of water bodies. According to relevant studies, river mussels can also effectively reduce nutrients such as nitrogen and phosphorus in water bodies, and the removal rates of total nitrogen, total phosphorus, ammonia nitrogen and nitrite nitrogen can reach 38%, 37%, 40% and 54% respectively, effectively reducing the content of ammonia nitrogen and phosphorus in water bodies, achieving the effect of improving water quality. An adult river mussel can filter 60-100 liters of water per day. However, the growth of river mussels, snails, etc. has certain requirements for water depth. If river mussels and snails are directly put into the water body, due to reasons such as water depth, they are bound to cause a large number of deaths and pollute the water body. Therefore, it is necessary to improve the existing technology. Utility Model Content
[0005] In order to solve the eutrophication problem of lakes and reservoirs, build a good water ecosystem in deep lakes with low transparency, improve the water purification function of the water ecosystem, restore aquatic biodiversity, and control lake and reservoir water pollution, the utility model provides a eutrophic water biological filtering and purification device.
[0006] The utility model is completed through the following technical scheme: a eutrophic water biological filtering and purification device, including a water surface floating body, characterized in that a plurality of breeding cages are arranged on the water surface floating body through a suspension rope, and river clams are placed in the breeding cages, so that the breeding cages containing river clams are suspended in the water body below the water surface floating body, and with the fluctuation of the water body, algae in the water continuously enter the breeding cages, allowing the river clams to filter the algae in the water body, thereby reducing the algae density of the water body and removing nutrients such as nitrogen and phosphorus in the water.
[0007] The water surface floating body comprises a plate body or a box body, and a foam float or an inflatable float box is arranged at the lower part of the plate body or the box body, so that the plate body or the box body always floats on the water surface.
[0008] The water surface floating body and a plurality of breeding net cages containing river clams are located at the upwind position of the dominant wind direction.
[0009] The top of the breeding cage containing river clams is 1.5-2.0m away from the water surface to prevent the breeding cage from causing the death of river clams in too deep water.
[0010] The suspension rope is wound around a rotating wheel on the upper surface of the floating body on the water surface, so that the rotating wheel can be rotated to retract and release the suspension rope as needed, thereby adjusting the depth of the breeding cage containing river clams in the water, so that the river clams can better filter the blue algae in the water and reduce the amount of blue algae.
[0011] The number of mussels in the breeding cage is: 20-30 / m 2 The specific number will be determined in a timely manner depending on the area, depth and density of blue algae in the water body.
[0012] The number of the floating objects and breeding cages on the water surface is determined in a timely manner according to the area, depth and density of blue algae in the water body, which is conducive to building a good aquatic biological ecosystem in the lake and is more conducive to the function of the aquatic ecosystem.
[0013] The utility model has the following advantages and effects: by adopting the above technical scheme, the breeding cages containing river clams can be conveniently suspended in the water body below the floating body on the water surface, and with the fluctuation of the water body, the algae in the water can continuously enter the breeding cages, so that the river clams can filter the algae in the water body, thereby reducing the algae density in the water body and removing nutrients such as nitrogen and phosphorus in the water. The number of river clams, floating bodies on the water surface and breeding cages can be determined in time according to the area, depth and density of blue algae in the water body, which is conducive to building a good aquatic biological ecosystem in the lake, and is more conducive to the function of the aquatic ecosystem, and reducing the pollution of blue algae to the water body as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the structure of the utility model. DETAILED DESCRIPTION
[0015] The utility model is further described below in conjunction with the accompanying drawings, but the protection content of the utility model is not limited thereto.
[0016] The utility model provides a biological predation and purification device for eutrophic water bodies, comprising a floating body 1 on the water surface, on which a plurality of breeding cages 4 are arranged by means of hanging ropes 3, and river clams 5 are placed in the breeding cages 4, so that the breeding cages 4 containing the river clams 5 are suspended in the water body below the floating body 1 on the water surface, and with the fluctuation of the water body, algae in the water continuously enter the breeding cages 4, so that the river clams 5 filter and feed on the algae in the water body, thereby reducing the algae density in the water body and removing nutrients such as nitrogen and phosphorus in the water.
[0017] The water surface floating body 1 comprises a board body, and a foam float 2 is arranged at the lower part of the board body so that the board body always floats on the water surface. Obviously, the water surface floating body 1 comprises a box body, and an inflatable buoyancy box is arranged at the lower part of the box body so that the box body always floats on the water surface.
[0018] The floating body 1 and the breeding cages 4 containing river clams 5 are located in the upwind position of the dominant wind direction. The top of the breeding cages 4 containing river clams 5 is 1.5-2.0m away from the water surface to prevent the death of river clams due to excessive water level.
[0019] The lifting rope 3 is wound on a rotating wheel (not shown in the figure) on the upper surface of the floating body 1 on the water surface, so that the rotating wheel can be rotated to retract and release the lifting rope as needed, thereby adjusting the depth of the breeding cage 4 containing the clams 5 in the water, so as to better allow the clams to filter the blue algae in the water and reduce the amount of blue algae.
[0020] The number of mussels in the breeding cage 4 is: 20-30 / m 2 The specific number will be determined in a timely manner depending on the area, depth and density of blue algae in the water body.
[0021] The number of the floating bodies 1 and the breeding cages 4 is determined timely according to the area, depth and density of the blue algae in the water body, which is conducive to building a good aquatic biological ecosystem in the lake and is more conducive to the performance of the functions of the aquatic ecosystem.
[0022] To prove the effect of the present utility model, the inventor conducted an exploratory test on the 20 square meters of water surface enclosed by Dongfeng Dam, Caohai, Dianchi Lake, Kunming from April to June 2023. A total of 3 groups of the present device were placed 1.5 meters underwater. 25 river clams with an average weight of more than 60 grams were stocked in the breeding cages of each group of devices. After 2 months, the Chla concentration in the water body dropped from 0.158±0.021 mg / L before the test to 0.069±0.005 mg / L, and the Chla concentration decreased by 56.33%. Filamentous algae began to attach and grow in local areas on the device, and the water environment quality in this area was improved from Class V to Class IV, indicating that the present device has a good effect on the purification of eutrophic water bodies.
Claims
1. A biological filtering and purifying device for eutrophic water, comprising a floating body on the water surface, characterized in that On the floating body on the water surface, a number of breeding cages are set up by hanging ropes, and river clams are placed in the breeding cages; The water surface floating body comprises a plate body or a box body, and a foam float or an inflatable float box is arranged at the lower part of the plate body or the box body; The top of the culture cage containing the mussels is 1.5-2.0 m above the water surface; The number of mussels in the breeding cage is: 20-30 / m 2 The specific number will be determined in due course according to the area, depth and density of blue algae in the water body; The suspension rope is wound around a rotating wheel on the upper surface of the floating body on the water surface; The water surface floating body and a number of breeding cages containing river clams are located in the upwind position of the dominant wind direction; The number of the floating bodies and breeding cages on the water surface is determined in due course according to the area, depth and density of the blue algae in the water body.