Suspended double-plastic co-release body slow-release denitrification filler structure

Abstract

The utility model provides a suspended double-plastic co-release body slow-release denitrification filler structure, which is used for increasing the contact area of a biological membrane and sewage, and comprises at least three filler layers which are sleeved, the whole body is a cylinder, gaps are arranged among the three filler layers, the three filler layers are connected with one another, and a filler structure hole is formed in each filler layer. According to the utility model, the multi-layer filler structure, the foaming structure and the filler structure holes 4 are adopted, so that the multi-layer filler structure has a larger specific surface area, more attachment and growth spaces are provided for microorganisms, and the formation and maintenance of a biological membrane are facilitated. The filler structure holes are used for increasing the contact area between the biological membrane and sewage, improving the treatment efficiency, promoting the flow of water flow and air, and contributing to maintaining the stability and activity of the biological membrane.

Description

Technical Field

[0001] The utility model relates to the technical field of total nitrogen removal fillers for rivers and lakes with low pollution load, in particular to a structure of a suspended dual-plastic co-release body slow-release denitrification filler. Background Technique

[0002] The excessive accumulation of nutrients such as nitrogen and phosphorus in water bodies is the main reason for water quality deterioration. When the total nitrogen (TN) in the water body exceeds 0.2 mg / L and the total phosphorus (TP) exceeds 0.02 mg / L, algae will multiply in large numbers due to their strong nitrogen and phosphorus competition ability, resulting in water quality deterioration, reduction of biodiversity, instability of the system balance, loss of self-purification ability, and ultimately leading to the destruction of the aquatic ecosystem and the further aggravation of environmental problems. Therefore, how to continuously and effectively achieve the reasonable distribution and regulation of nitrogen and phosphorus nutrients in water bodies has become the core and key to preventing water body deterioration, inhibiting the outbreak of cyanobacteria, and constructing a perfect water body ecosystem.

[0003] At present, the water body deterioration prevention and control technologies based on nitrogen and phosphorus emission control mainly start from the single target angle of controlling nitrogen and phosphorus nutrients, and reduce the dissolved nitrogen and phosphorus concentrations in the water body through chemical or biological means to control water quality deterioration. For example, aluminum salt and iron salt coagulants can precipitate the dissolved phosphorus in the water body, but the addition of a large amount of coagulants will affect the pH value and alkalinity of the water body, harm the normal growth and reproduction of aquatic animals and plants, and cause the risk of secondary pollution; the biological denitrification technology based on nitrification-denitrification, anaerobic ammonium oxidation and other effects can effectively remove nitrogen in the water, but for the open surface water environment with low pollution load, there are still technical bottlenecks in controlling the total nitrogen concentration below 0.5 mg / L, which greatly limits the effective application of traditional biological denitrification technology in improving the water quality of surface water bodies. How to achieve the reasonable distribution and regulation of nitrogen and phosphorus nutrients at different trophic levels of the water body ecosystem starting from the natural succession law and internal mechanism of the water body ecosystem still lacks systematic research.

[0004] Domestic scholars found through limnological experiments that the growth of algae in Taihu Lake is mainly nitrogen-limited in summer and mainly phosphorus-limited in spring. Therefore, some scholars believe that phosphorus should be controlled first during the phosphorus-limited period and nitrogen should be controlled first during the nitrogen-limited period for lake governance. For summer with serious cyanobacteria blooms, nitrogen should be controlled first. Therefore, this patent can effectively control the eutrophication of rivers and lakes in summer.

[0005] Microorganisms are the core and hub of the water ecosystem and the link for the transfer and distribution of nutrients (carbon, nitrogen, phosphorus) in water among different trophic levels (aquatic animals and plants, etc.) in the water ecosystem. The water ecosystem promotes the decomposition and utilization of pollutants (carbon, nitrogen, and phosphorus nutrients) based on the assimilation and dissimilation of the microbial system, and constructs and extends the system food chain through the synergistic, competitive, and predatory interactions between microorganisms and aquatic animals and plants, promoting the transfer of nitrogen and phosphorus nutrient elements in water among different trophic levels, achieving the reasonable distribution and regulation of elements such as carbon, nitrogen, and phosphorus in water, and maintaining the stability of the ecosystem. Therefore, the directional regulation of the microbial community structure and function plays an important role in the reasonable distribution of nitrogen and phosphorus nutrients in water and the stability of the ecosystem. Summary of the Invention

[0006] The purpose of the present invention is to provide a filler structure that can greatly increase the biomass of functional microorganisms and promote the further removal of nitrogen elements in water.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A suspended double-plastic co-release slow-release denitrification filler structure for enhancing the contact area between the biofilm and sewage, including at least three nested filler layers, which is in a cylindrical shape as a whole. There are gaps between the three filler layers and they are connected to each other. Each filler layer is provided with filler structure holes.

[0009] Preferably, the filler layer includes a first layer, a second layer, and a third layer. The second layer is sleeved outside the first layer, and the third layer is sleeved outside the second layer. The first layer, the second layer, and the third layer are connected to each other through a cross-shaped filler connecting frame.

[0010] Preferably, the pore diameters of the filler structure holes in each layer are 8mm, 6mm, and 4mm respectively 。

[0011] Preferably, the gap between the first layer, the second layer, and the third layer is 2mm

[0012] Preferably, the filler structure holes on the three filler layers are staggered.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The present invention has a large specific surface area due to its multi-layer filler structure, foaming structure, and filler structure holes 4, which provides more attachment and growth space for microorganisms and is conducive to the formation and maintenance of the biofilm.

[0015] (2) The filler structure holes in the present utility model are used to enhance the contact area between the biofilm and the sewage, improve the treatment efficiency, and can also promote the flow of water and air, contributing to maintaining the stability and activity of the biofilm. Description of the Drawings

[0016] Figure 1 FIG. is a three-dimensional structural schematic diagram of a suspended double-plastic co-release slow-release denitrification filler structure provided for an embodiment of the present utility model;

[0017] Figure 2 FIG. is a top-view structural schematic diagram of a suspended double-plastic co-release slow-release denitrification filler structure provided for an embodiment of the present utility model;

[0018] The numbers in the figure are as follows:

[0019] 1, the first layer; 2, the second layer; 3, the third layer; 4, the filler structure hole; 5, the filler connecting frame. Detailed Embodiment

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0021] As Figure 1 and Figure 2 shown, a suspended double-plastic co-release slow-release denitrification filler structure disclosed by the present utility model is used to enhance the contact area between the biofilm and the sewage, and includes three nested filler layers, which are divided into the first layer 1, the second layer 2, and the third layer 3. The second layer 2 is sleeved outside the first layer 1, and the third layer 3 is sleeved outside the second layer 2. The first layer 1, the second layer 2, and the third layer 3 are connected to each other through a cross-shaped filler connecting frame 5 to form a whole, presenting a cylindrical structure; there are gaps between the three filler layers, and each filler layer is provided with filler structure holes 4. The filler structure holes 4 are used to allow the passage of liquid or gas, playing the role of increasing the specific surface area of the filler. These small round holes are designed to enhance the contact area between the biofilm and the sewage, improve the treatment efficiency, and can also promote the flow of water and air, contributing to maintaining the stability and activity of the biofilm.

[0022] Furthermore, in this embodiment, from the inside to the outside, the aperture of the filler structure holes 4 in the first layer 1 of the filler layer is 8 mm, the aperture of the filler structure holes 4 in the second layer 2 is 6 mm, and the aperture of the filler structure holes 4 in the third layer is 4 mm. The aperture on the filler layer gradually increases from the inside to the outside, which can achieve hierarchical release and make the release amount gradually increase.

[0023] Furthermore, in this embodiment, the gaps between the first layer 1, the second layer 2, and the third layer 3 are all 2 mm. This can not only promote the uniform distribution of water flow, avoid dead corners and short-circuit flow phenomena, and improve the overall treatment efficiency of the system; it can also increase the efficiency of oxygen transfer to the biofilm, thereby enhancing the activity of aerobic microorganisms and nitrogen removal ability; at the same time, it can alleviate the biofilm shedding phenomenon caused by excessive water flow pressure, thus maintaining a stable biofilm thickness and reaction efficiency. And the gaps between each layer can make the system easier to maintain and clean, and extend the service life of the packing.

[0024] In addition, the gaps between each layer are set in an increasing parameter manner. Through the packing structure with increasing pore sizes in multiple layers plus the gap settings between each layer, the removal effect of nitrogen in water can be optimized, and the stability and treatment efficiency of the system can be improved.

[0025] Furthermore, in this embodiment, the packing structure holes 4 on the three packing layers are arranged in a staggered distribution ( Figure 2 the attached figure shows the scheme without staggered distribution).

[0026] This embodiment uses a suspended double-plastic co-release slow-release denitrification packing. Within 15 - 25 days after dosing, the main water quality indicators such as COD, TN, TP, and turbidity can be improved from inferior to Class V to Class IV level (GB 3838 - 2002). The relative abundance of denitrifying microorganisms can be increased from less than 5% to more than 10%. The expression level of periplasmic nitrate reductase NapA in denitrifying bacteria is up-regulated by 5 times (calculated as log2FC), and the expression level of NapB is up-regulated by 4 times. Compared with ordinary packing, this suspended double-plastic co-release slow-release denitrification packing can increase the biological denitrification efficiency by up to 10 times.

[0027] PHAs and PLA particles are melted at 220°C in different mass ratios to ensure that the two materials are fully mixed during the melting process. According to the set mass ratio (3:7 - 7:3), blends with different ratios are prepared, and the concentration of the PHAs degradation products released from the packing is adjusted. The slow-release rate is determined by calculating the change of the release amount over time.

[0028] PHAs and PLA particles are mixed according to the slow-release period in a preset ratio, melted and mixed within the temperature range of 220°C. According to the slow-release period, inorganic fillers such as calcium carbonate, wollastonite, talc, montmorillonite, bentonite, and diatomite are weighed and gradually added to the melted polymer mixture to ensure that the fillers are evenly dispersed in the matrix material, and a blend is prepared. A foaming agent is added to the blend and mixed evenly. Determine the proportion of inorganic fillers and the content of the foaming agent for the performance of the composite material. Ensure that the filler has a sufficient specific surface area to provide for the attached microorganisms, thereby increasing the utilization efficiency of the microorganisms.

[0029] It has a large specific surface area through the multi-layer packing structure, the foaming structure of the packing, and the holes 4 in the packing structure, which provides more attachment and growth space for microorganisms and is conducive to the formation and maintenance of biofilms.

[0030] The application method of this embodiment is as follows:

[0031] Put the mixed composite into a cylindrical mold (i.e., the device of this embodiment), and evenly punch small round holes at different levels of the packing. Put the formed packing into an oven for drying.

[0032] The packing regulates the attached bacterial community structure directionally, mainly functional anaerobic denitrifying bacteria species. Microorganisms attach to the surface of the packing to form biofilms, and these microorganisms grow and metabolize by degrading organic matter in the water body. This packing can directionally induce the microbial community to rapidly converge towards the functional population, and the activities of indigenous dominant bacteria with nitrogen and phosphorus removal functions such as Pseudomonas, Acinetobacter, Flavobacterium, and Comamonas are enhanced and they proliferate rapidly, and become the main dominant bacteria after 2 - 3 generations.

[0033] The floating double - plastic co - release denitrifying packing structure can directly place the packing in rivers and lakes with relatively low flow velocity, or concentrate the packing in a water quality improvement reactor for the removal of total nitrogen in surface water, especially for the removal of total nitrogen in rivers and lakes with low pollution load.

[0034] Through this packing structure, the biofilm on the packing can have a high activity, can efficiently degrade organic pollutants in the water body, improve the denitrification ability, and avoid the problems of water eutrophication and algal bloom outbreaks in lakes and reservoirs caused by excessive nitrogen nutrient elements.

[0035] In this embodiment, the three - layer packing structure combines the advantages of two biodegradable polymers, polyhydroxyalkanoates (PHAs) and polylactic acid (PLA). By regulating the component ratio, the content of inorganic fillers, and the use of blowing agents, the effective control of the slow - release rate of the effective components of the packing is achieved. At the same time, the density and porosity of the optimized material are realized through the three - layer packing structure of the cylinder; at the same time, the enrichment of functional bacteria species in the packing is also realized, enabling the efficient removal of nitrogen nutrient elements in the water body. At the same time, a three - layer packing structure mainly composed of this slow - release material is innovatively designed, further promoting the reduction of nitrogen elements in the water body.

[0036] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined.

[0038] The above is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. A floating double-plastic co-release body slow-release denitrification filler structure for enhancing the contact area between the biofilm and sewage, characterized in that, It includes at least three nested packing layers, which are in a cylindrical shape as a whole. There are gaps between the three packing layers and they are interconnected. Each packing layer is provided with packing structure holes (4); The packing layer includes a first layer (1), a second layer (2) and a third layer (3). The second layer (2) is sleeved outside the first layer (1), and the third layer (3) is sleeved outside the second layer (2). The first layer (1), the second layer (2) and the third layer (3) are interconnected by a cross-shaped packing connecting frame (5); The packing structure holes (4) on the three packing layers are staggered; 2. The structure of a floating dual-plastic co-release slow-release denitrification filler according to claim 1, characterized in that, The aperture diameters of the packing structure holes (4) on each layer are 8mm, 6mm and 4mm respectively; 3. The structure of a floating dual-plastic co-release slow-release denitrification filler according to claim 1, characterized in that, The gap between the first layer (1), the second layer (2) and the third layer (3) is 2mm.

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