High-efficiency biological denitrification and phosphorus removal filler

Abstract

This utility model discloses a high-efficiency biological phosphorus and nitrogen removal packing material, belonging to the technical field of phosphorus and nitrogen removal packing materials. It includes a streamlined shell, an insulation layer, and a biological attachment layer arranged sequentially from the outside to the inside. The closed-pore structure of the insulation layer reduces heat loss, maintains the suitable temperature required for microbial metabolism, and enhances the metabolic activity of nitrifying bacteria, thereby improving the removal rate of ammonia nitrogen and total nitrogen. The micro-grooves of the streamlined shell and the hierarchical pore structure of the biological attachment layer increase the specific surface area of ​​the packing material and the amount of microbial attachment, enhance the mass transfer efficiency between wastewater and biofilm, promote the proliferation and metabolism of polyphosphate-accumulating bacteria, and improve the total phosphorus removal effect. It can effectively solve the problem of low nitrogen and phosphorus removal efficiency in the prior art under low temperature conditions.

Description

Technical Field

[0001] This utility model relates to the field of phosphorus and nitrogen removal packing technology, and more specifically, it relates to high-efficiency biological phosphorus and nitrogen removal packing. Background Technology

[0002] High-efficiency biological phosphorus and nitrogen removal packing is the core functional material of wastewater treatment bioreactor systems. By optimizing the microbial attachment and growth environment and enhancing mass transfer efficiency, it promotes the enrichment and metabolism of functional microorganisms such as nitrifying bacteria, denitrifying bacteria, and polyphosphate-accumulating bacteria, thereby improving the removal efficiency of total nitrogen (TN) and total phosphorus (TP) in wastewater. Its design must take into account the microbial carrying capacity, hydraulic characteristics, and chemical stability. It is widely used in the deep treatment and upgrading projects of municipal sewage and industrial wastewater (such as chemical, food, and dyeing wastewater).

[0003] High-efficiency biological phosphorus and nitrogen removal packing material serves as a carrier for the attachment and growth of microorganisms. Its performance directly affects the colonization and metabolic efficiency of functional microbial communities such as nitrifying bacteria, denitrifying bacteria, and polyphosphate-accumulating bacteria in the reactor, thereby determining the wastewater purification effect.

[0004] In the field of low-temperature wastewater treatment in northern China, biological packing materials, as carriers of microorganisms, directly determine the efficiency of nitrogen and phosphorus removal and the stability of the system. However, in existing technologies, packing materials often focus on improving roughness or optimizing pore structure, but neglect the special characteristics of low-temperature environments. Although the attachment area is increased through surface pore structure, the lack of heat insulation layer design leads to a decrease in the metabolic rate of nitrifying bacteria and a low ammonia nitrogen removal rate during low-temperature wastewater treatment, making it difficult to simultaneously meet the synergistic requirements of heat insulation, efficient attachment, and mass transfer efficiency. Utility Model Content

[0005] To achieve the above objectives, the present invention provides the following technical solution: High-efficiency biological phosphorus and nitrogen removal packing material, characterized in that it comprises: a streamlined shell, a heat insulation layer and a biological attachment layer arranged sequentially from the outside to the inside; The insulation layer is fixed to the inner wall of the streamlined shell through a continuous foaming process. It has several non-interconnected closed-cell structures inside, each containing several non-interconnected micro-bubbles. Air is sealed inside the micro-bubbles to form a spacer layer. At the same time, the insulation layer has several through-flow channels inside to provide contact between sewage and biofilm.

[0006] Furthermore, the bio-attachment layer is fixed to the inner wall of the insulation layer, and its internal structure has a hierarchical pore structure that provides a layered attachment and survival space for microorganisms.

[0007] Furthermore, the streamlined shell outer surface is constructed with several tiny grooves to increase the contact surface area between the packing and the sewage.

[0008] Furthermore, the streamlined shell surface is provided with several tiny grooves to increase the specific surface area of ​​the filler.

[0009] Furthermore, the micro-groove is semi-circular.

[0010] Furthermore, the streamlined housing surface is provided with a streamlined design.

[0011] In summary, this utility model has the following beneficial effects: This invention reduces heat loss through the closed-cell structure of the insulation layer, maintaining a suitable temperature for microbial metabolism and enhancing the metabolic activity of nitrifying bacteria, thereby improving the removal rates of ammonia nitrogen and total nitrogen. The micro-grooves in the streamlined shell and the hierarchical pore structure of the bio-attachment layer increase the specific surface area of ​​the packing and the amount of microbial attachment, enhancing the mass transfer efficiency between wastewater and biofilm, promoting the proliferation and metabolism of polyphosphate-accumulating bacteria, and improving the total phosphorus removal effect. It can effectively solve the problem of low nitrogen and phosphorus removal efficiency in the existing technology under low temperature conditions. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the streamlined outer shell of this utility model; Figure 3 This is a schematic diagram of the structure of the thermal insulation layer and the biological attachment layer in this utility model.

[0014] In the picture: 1. Streamlined shell; 101. Micro-grooves; 2. Thermal insulation layer; 201. Micro-pores; 202. Flow channels; 3. Bio-attachment layer; 301. Hierarchical pore structure. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Example

[0016] The following is in conjunction with the appendix Figure 1-3 The present invention will be described in further detail below.

[0017] Please see Figure 1-3 This utility model provides a technical solution: a high-efficiency biological phosphorus and nitrogen removal packing material, such as... Figure 1-3 As shown, it includes a streamlined shell 1, a thermal insulation layer 2, and a bio-attachment layer 3 arranged sequentially from the outside to the inside.

[0018] like Figure 1-2 As shown, the streamlined shell 1 is made of modified polypropylene (PP) material, which has excellent corrosion resistance, aging resistance and mechanical strength. At the same time, the density is controlled to ensure that the packing is suspended in water, improving the contact efficiency with sewage. The outer surface is constructed with several micro-grooves 101 to increase the specific surface area of ​​the packing and sewage. The micro-grooves 101 are semi-circular and have no sharp edges, so that sewage will not form dead corners in the grooves when it flows through, avoiding sludge accumulation that affects the mass transfer effect. At the same time, the curved structure can guide the sewage to form laminar flow, reduce the energy loss of the fluid on the surface of the packing, and ensure the overall flow stability in the reactor. The streamlined shell 1 is made by injection molding process, and the surface is designed with a streamlined shape. This design increases the specific surface area of ​​the shell compared with conventional smooth shells, reducing the flow resistance of the packing in sewage.

[0019] like Figure 3 As shown, the insulation layer 2 is made of rigid polyurethane foam material and is fixed to the inner wall of the streamlined shell 1 through a continuous foaming process. It has a number of closed-cell structures that are not interconnected. The closed-cell structures contain a number of micro-cells 201 that are not interconnected. Air is sealed in the micro-cells 201 to form a spacer layer with heat insulation properties. At the same time, during the foaming process, a through-flow channel is processed inside the insulation layer 2 through a pre-set mold to provide contact between sewage and biofilm. The bio-attachment layer 3 is made of modified porous ceramic material with added nano-titanium dioxide for surface modification treatment. This ensures the biocompatibility of the material while improving the attachment and chemical stability of microorganisms. It is fixed to the inner wall of the insulation layer 2. Its internal structure has a hierarchical pore structure 301. The hierarchical pore structure 301 has large pores on the surface, medium pores in the middle, and small pores in the inner. The pores at each level are staggered to provide layered attachment and survival space for different types of microorganisms (nitrifying bacteria, denitrifying bacteria, and polyphosphate-accumulating bacteria).

[0020] Working principle: Wastewater first comes into contact with the streamlined shell 1. Under the action of the streamlined guide and the micro-grooves 101, suspended pollutants are initially adsorbed and flow evenly to the insulation layer 2. The wastewater enters the inner layer through the guide channel 202 of the insulation layer 2. The insulation layer 2 maintains a suitable temperature to ensure that the activity of microorganisms is not affected by low temperature. The wastewater comes into full contact with the graded pores of the biological attachment layer 3. Nitrifying bacteria, denitrifying bacteria, and polyphosphate-accumulating bacteria metabolize in their respective dedicated pores, completing the entire process of ammonia nitrogen oxidation, nitrate nitrogen reduction, and phosphorus absorption. The treated wastewater flows out from the packing material, achieving efficient removal of TN and TP. In the description of this specification, the reference to the terms "an embodiment," "example," "specific example," etc., means that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model.

[0021] In this specification, the illustrative expressions of the terms used above do not necessarily refer to the same embodiments or examples.

[0022] Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A high efficient biological phosphorus and nitrogen removal filler, characterized in that, include: The streamlined shell (1), the heat insulation layer (2), and the biological attachment layer (3) are arranged sequentially from the outside to the inside. The insulation layer (2) is fixed to the inner wall of the streamlined shell (1) by a continuous foaming process. It has a number of closed-cell structures that are not interconnected. The closed-cell structures have a number of micro-bubbles (201) that are not interconnected. Air is sealed in the micro-bubbles (201) to form a spacer layer. At the same time, the insulation layer (2) has a number of through-flow channels (202) that provide contact between sewage and biofilm.

2. The high-efficiency biological dephosphorization and denitrification filler according to claim 1, characterized in that, The bio-attachment layer (3) is fixed to the inner wall of the insulation layer (2), and its internal structure has a hierarchical pore structure (301) that provides a layered attachment and survival space for microorganisms.

3. The high-efficiency biological phosphorus and nitrogen removal packing material according to claim 1, characterized in that, The streamlined shell (1) has several tiny grooves (101) on its outer surface to increase the contact surface area between the packing and the sewage.

4. The high-efficiency biological dephosphorization and denitrification filler according to claim 3, characterized in that, The micro-groove (101) is semi-circular.

5. The high efficiency biological phosphorus and nitrogen removal packing as claimed in claim 3, characterized in that, The streamlined housing (1) has a streamlined design on its surface.

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