Intelligent dissolved oxygen regulation and control type ecological floating island based on enhanced phosphorus removal composite material

Abstract

The utility model discloses a combined ecological floating island based on an enhanced phosphorus removal composite material, and aims to solve the problems that the existing artificial ecological floating island is poor in external environment change resistance and insufficient in water nitrogen and phosphorus synergistic purification capacity. The floating island comprises a floating island body suspended on the water surface, a circular-truncated-cone-shaped hole is formed in the center of a sub-module of the floating island body, a filler ball string filled with a reinforced dephosphorization composite material is embedded into the central hole through a circular-truncated-cone-shaped cover body and suspended below the floating island, and the composite material in the filler ball is lanthanum hydroxide modified mesoporous sludge-based biochar. A solar cell panel is installed on the floating island to supply power to an intelligent online dissolved oxygen tester, and the aeration machine is intelligently regulated and controlled by monitoring the content of dissolved oxygen in water online in real time to aerate a micropore aeration pipe which vertically penetrates through the floating island and extends to the lower end of a composite material filling ball. According to the ecological floating island disclosed by the utility model, the water phosphorus removal efficiency is effectively improved through the synergistic effect of the aquatic plants, the enhanced phosphorus removal material in the suspended filler and the attached microorganisms, and the filler string is convenient to replace; and the aeration system is intelligently controlled by the online dissolved oxygen tester, so that the combined ecological floating island timely responds to dissolved oxygen fluctuation caused by external environment condition change, and the efficient metabolic activity of microorganisms is maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of ecological floating islands, and particularly relates to an intelligent dissolved oxygen regulation type ecological floating island based on a composite material for enhanced phosphorus removal. Background Art

[0002] Relevant research results show that 80% of lake eutrophication is restricted by phosphorus, and about 10% of lake eutrophication is related to nitrogen. Since about 90% or more of the endogenous pollutants in lakes such as nitrogen and phosphorus are accumulated in the sediment of rivers and lakes, even after the external pollution is effectively controlled, the release of endogenous pollutants in the sediment will greatly delay the restoration of the lake ecosystem. When the external environmental conditions change (such as wind wave disturbance, dissolved oxygen fluctuation, etc.), nutrients such as nitrogen and phosphorus will continuously be released into the overlying water to form an endogenous load, resulting in the aggravation of water eutrophication. Artificial ecological floating islands have been widely used in actual river and lake water quality improvement and ecological governance projects due to their eco-friendly advantages such as in-situ restoration, reduction of pollutant diffusion, small floor area, and provision of habitats for fish and birds. However, the traditional ecological floating islands composed of substrates and plants only rely on plant absorption and root microorganism degradation to remove nutrients such as nitrogen and phosphorus in water, with single functions and low water quality purification efficiency; the ecological floating islands equipped with aeration devices can effectively improve the water treatment efficiency, but the equipment energy consumption is relatively high. When the dissolved oxygen concentration reaches a certain threshold, increasing its concentration will not only not improve the nutrient removal rate, but will instead inhibit denitrification due to the excessive oxygen concentration, resulting in a decrease in nitrogen removal efficiency, and excessive aeration will cause energy waste; for the ecological floating islands equipped with fillers, there are problems such as low nitrogen and phosphorus adsorption efficiency of the materials and non-reusability, and they need to be replaced manually in a timely manner. However, the existing ecological floating island fillers are suspended in the water below the floating body, causing great inconvenience for replacement. In addition, in areas with large seasonal temperature differences, the nitrogen and phosphorus removal ability of ecological floating islands is significantly affected by seasons. The rate of plant absorption of nutrients is greatly affected by temperature. The change in temperature causes a change in the dissolved oxygen concentration in water, which in turn affects the metabolic activity of microorganisms, resulting in fluctuations in nitrogen and phosphorus removal efficiency. At present, most artificial ecological floating islands have a high nitrogen removal efficiency, but a poor phosphorus removal effect. There is an urgent need to develop artificial ecological floating islands for efficient co-removal of nitrogen and phosphorus under changing external environmental conditions. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the problems of poor resistance of existing artificial ecological floating islands to external environmental changes, insufficient co-purification ability of water body nitrogen and phosphorus, and inconvenient replacement of adsorption materials, and to provide a combined low-carbon energy-saving ecological floating island based on a composite material for enhanced phosphorus removal with high phosphorus purification efficiency.

[0004] The present utility model provides the following technical solution: An intelligent dissolved oxygen regulation type ecological floating island based on a composite material for enhanced phosphorus removal, comprising a floating island body suspended on the water surface, a string of filler balls filled with the composite material for enhanced phosphorus removal suspended below the floating island, a microporous aeration pipe vertically penetrating the floating island and extending to the lower end of the filler balls filled with the composite material, and a counterweight fixed to the bottom of the aeration pipe. Multiple plant planting grooves are provided inside the artificial floating island body. A solar panel is installed on the artificial floating island and is electrically connected to an intelligent on-line dissolved oxygen measuring instrument (dissolved oxygen controller). The sensor in the probe of the dissolved oxygen meter extends below the water surface.

[0005] Further, the floating island body is composed of high-density polyethylene square sub-modules bolted together. There are four planting grooves on the sub-module, and there is a frustum-shaped hole in the center of the sub-module.

[0006] Further, the string of filler balls is composed of a cover body, a rope, and filler balls. The cover body is embedded in the frustum-shaped hole in the center of the sub-module of the floating island body. The lower end of the cover body is connected to the rope. The diameter of the filler balls is smaller than the minimum diameter of the frustum-shaped hole. The filler balls are suspended on the rope at equal intervals, and the length of the rope is determined by the water depth.

[0007] Further, the composite material for enhanced phosphorus removal filled in the filler balls is lanthanum hydroxide modified mesoporous sludge-based biochar.

[0008] Further, the microporous aeration pipe penetrating the floating island and extending to the lower end of the filler balls filled with the composite material is powered by the solar panel. The solar panel is connected to a storage battery through an electric wire. The storage battery is connected to the COM common terminal of the low-point control terminal of the intelligent on-line dissolved oxygen measuring instrument through an electric wire. The NO normally open terminal of the on-line dissolved oxygen measuring instrument is connected to an aerator through an electric wire. The other end of the aerator is connected to the storage battery to form a loop. The air outlet of the aerator is connected to the microporous aeration pipe through silicone rubber. The bottom end of the aeration pipe is connected to a cement counterweight through a PVC rope.

[0009] Compared with the prior art, the present utility model has the following advantages:

[0010] 1. Through the synergistic effect of aquatic plants, the enhanced phosphorus removal material in the suspended filler, and the microorganisms attached to the filler, the present utility model effectively improves the phosphorus removal efficiency of the water body;

[0011] 2. By intelligently controlling the aeration system through the on-line dissolved oxygen measuring instrument, the present utility model timely responds to the dissolved oxygen fluctuations caused by changes in external environmental conditions, and realizes low-carbon energy conservation while maintaining the stable metabolic activity of microorganisms;

[0012] 3. Through the detachable cover body of the string of filler balls, the present utility model realizes the convenient and rapid replacement of the adsorption material.

[0013] In summary, the device combines pollution treatment and landscape effects, has a simple structure, is not easily damaged, has a low production cost, is convenient for operation and maintenance, has low energy consumption, good water purification effect, and no secondary pollution. Description of the Drawings

[0014] Figure 1 It is a schematic structural view of an intelligent dissolved oxygen regulation type ecological floating island based on a phosphorus removal composite material in this embodiment.

[0015] Figure 2 It is a top view of an intelligent dissolved oxygen regulation type ecological floating island body based on a phosphorus removal composite material in this embodiment.

[0016] Figure 3 It is a front view of a frustum-shaped cover body of an intelligent dissolved oxygen regulation type ecological floating island based on a phosphorus removal composite material and the connected filler string in this embodiment.

[0017] In the figure: 1. Floating island body; 2. Filler ball string; 3. Micro-pore aeration pipe; 4. Cement counterweight block; 5. Solar panel; 6. Storage battery; 7. Intelligent on-line dissolved oxygen detector; 8. Dissolved oxygen probe; 9. Aerator; 10. Inverted frustum-shaped cover body. Specific Embodiments

[0018] To facilitate the understanding of the present invention, the present invention will be described more comprehensively and in detail below in conjunction with the accompanying drawings of the specification and the preferred embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0019] As Figure 1 , the combined ecological floating island based on a phosphorus removal composite material includes a floating island body, a filler ball string, a micro-pore aeration pipe, a counterweight block, a solar panel, and an intelligent on-line dissolved oxygen detector.

[0020] In this embodiment, the floating island body is composed of high-density polyethylene square sub-modules connected by bolts. Each sub-module has four planting grooves. The bottom of the planting groove is wrapped with a planting medium such as polyurethane sponge around the root part of the plant, and the lower end of the root extends into the water. In the planting groove, a variety of plants with strong adaptability, strong purification ability, and developed roots are selected for planting in combination. Therefore, plants such as Caldesia parnassifolia, Sagittaria sagittifolia, Canna glauca, Colocasia antiquorum, Lythrum salicaria, and Typha orientalis, which have strong nitrogen and phosphorus absorption ability, are alternately planted. The cooperation of multiple plants is beneficial to the complementary advantages between plant species. According to different seasons and varieties of plants, different growth periods can be connected to each other, always maintaining a high purification effect of the floating island, and forming a multi-level evergreen water view.

[0021] In this embodiment, there is a hole in the center of the floating island body sub-module. The hole is in the shape of an inverted frustum of a cone. The upper aperture diameter of the hole is the same as the diameter of the cover of the packing ball string, and the lower aperture diameter of the hole is slightly larger than the diameter of the packing ball. The packing balls are connected in series by ropes and connected to the bottom of the cover. The packing ball string can pass through the hole in sequence and be suspended under the floating island body. Finally, the inverted frustum-shaped cover at the top of the packing ball string is embedded into the hole. There is a pull ring on the cover, and the packing ball string can be taken out from under the floating island body through the hole by pulling up the pull ring to replace the adsorption material therein.

[0022] In this embodiment, the enhanced phosphorus removal composite material filled in the packing ball is lanthanum hydroxide modified mesoporous sludge-based biochar. The biochar is prepared by dehydrating the excess sludge through drying, grinding, and pyrolysis. Subsequently, the sludge-based biochar and lanthanum hydroxide are mixed in proportion and impregnated in ultrapure water and then dried to obtain lanthanum-modified sludge-based biochar. Lanthanum can combine with the biochar to provide new phosphate adsorption sites and still have a specific affinity for phosphate at trace levels. Moreover, the excess sludge has a wide source and a low price, and the preparation method is simple to operate. The prepared modified biochar has good adsorption effect, large adsorption capacity, and a long material use cycle, reducing the frequency of manual replacement of the adsorption material. In addition, various microorganisms with nitrogen and phosphorus removal functions will attach and grow on the modified biochar, and the efficient removal of nitrogen and phosphorus is achieved through the combined effects of physical adsorption, chemical conversion, and microbial degradation.

[0023] In this embodiment, the solar panel converts energy into electrical energy and stores it in the storage battery. The storage battery is connected to the COM common terminal of the low-point control terminal of the intelligent on-line dissolved oxygen analyzer through an electric wire. The NO normally open terminal of the on-line dissolved oxygen analyzer is connected to the aerator through an electric wire. The other end of the aerator is connected to the storage battery to form a loop. The air outlet of the aerator is connected to the microporous aeration pipe through silicone rubber. The probe sensor of the intelligent on-line dissolved oxygen analyzer extends to half of the height of the packing ball string below the water surface. To maintain the underwater dissolved oxygen concentration range between 1.5 and 2.1 mg / L, the low point of the on-line dissolved oxygen analyzer is set to 1.8 mg / L, and the hysteresis is set to 0.2 mg / L. When the on-line dissolved oxygen analyzer shows that the dissolved oxygen concentration is less than or equal to 1.6 mg / L, the low-point relay of the on-line dissolved oxygen analyzer will be attracted, and after the aerator is powered on, it will aerate the area around the floating island through the microporous aeration pipe. When the on-line dissolved oxygen analyzer shows that the dissolved oxygen concentration is greater than or equal to 2.0 mg / L, the low-point relay of the on-line dissolved oxygen analyzer will be disconnected, and the aerator will stop aerating. This intelligent on-line dissolved oxygen control system can maintain the dissolved oxygen concentration in the underwater habitat within the micro-oxygen concentration range, realize the simultaneous nitrification and denitrification of denitrifying functional bacteria to improve the total nitrogen removal rate while achieving low-carbon energy conservation.

[0024] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A dissolved oxygen intelligent control ecological floating island based on enhanced phosphorus removal composite material, characterized in that: The invention comprises a floating island body suspended on the water surface, a string of filler balls filled with enhanced phosphorus removal composite materials suspended below the floating island, a microporous aeration pipe vertically penetrating the floating island and extending to the lower end of the filler balls filled with the composite materials, and a counterweight block fixed at the bottom of the aeration pipe. A plurality of plant planting troughs are arranged in the floating island body. A solar panel is installed on the floating island. The solar panel is electrically connected to an intelligent online dissolved oxygen meter. The sensor in the probe of the dissolved oxygen meter extends below the water surface.

2. The dissolved oxygen intelligent control ecological floating island based on enhanced phosphorus removal composite material according to claim 1 is characterized by: The floating island body is composed of high-density polyethylene square sub-modules connected by bolts, a plurality of planting grooves are arranged on the sub-modules, and a truncated cone-shaped hole is provided in the center of the sub-module.

3. The dissolved oxygen intelligent control ecological floating island based on enhanced phosphorus removal composite material according to claim 1 is characterized by: The packing ball string consists of a cover body, a rope and packing balls. The cover body is embedded in the central conical hole of the floating island body submodule, and the lower end of the cover body is connected to the rope. The diameter of the packing balls is smaller than the minimum diameter of the conical hole. The packing balls are hung on the rope at equal intervals, and the length of the rope is determined by the water depth.

4. The dissolved oxygen intelligent control ecological floating island based on enhanced phosphorus removal composite material according to claim 1 is characterized by: The enhanced phosphorus removal composite material contained in the filler balls is lanthanum hydroxide-modified mesoporous sludge-based biochar.

5. The dissolved oxygen intelligent control ecological floating island based on enhanced phosphorus removal composite material according to claim 1 is characterized by: The microporous aeration pipe that runs through the floating island and extends to the lower end of the composite material filler ball is powered by a solar panel, the solar panel is connected to the battery through wires, the battery is connected to the COM common terminal of the low point control terminal of the intelligent online dissolved oxygen meter through wires, the NO normally open terminal of the online dissolved oxygen meter is connected to the aerator through wires, the other end of the aerator is connected to the battery to form a loop, the air outlet of the aerator is connected to the microporous aeration pipe through silicone rubber, and the bottom end of the aeration pipe is connected to the cement counterweight through a PVC rope.

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