A gradient porosity MABR membrane filament module structure

Abstract

The utility model discloses a kind of gradient porosity MABR membrane silk assembly structures, including tube sheet, the bottom of the tube sheet is fixedly installed with hydrophobic layer, the inner wall of the hydrophobic layer is fixedly attached with vertical support layer, the hydrophobic layer and vertical support layer are all perforated with air hole, the inside of the vertical support layer is perforated with through hole, the diameter of the straight hole of the one end of tube sheet close to through hole is larger by being set, the one end of tube sheet is gas inlet end, so the gas pressure of the one end of tube sheet close is smaller, the diameter of the through hole of far away gas inlet end is smaller, so the passage cross-sectional area of the one end of tube sheet close is reduced, gas compression leads to gas pressure greater than gas inlet end, so the oxygen content dissolved into external water in unit time will rise, compensate terminal biofilm due to biofilm thickening leads to dissolved oxygen content low Problem, the air hole density of gas outlet end is larger, enhance the oxygen diffusion capacity of terminal, compensate oxygen transfer attenuation due to biofilm thickening, avoid terminal anoxia, promote outer layer denitrifying bacteria enrichment.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a gradient porosity MABR membrane fiber assembly structure. Background Technology

[0002] MABR membrane fibers are the core component of the membrane aerated biofilm reactor, representing a revolutionary wastewater treatment technology. By coupling aeration with biofilm reaction, it achieves high efficiency, energy saving, and low carbon emissions in wastewater treatment. MABR membrane fibers use permeable hollow fiber membranes as the biofilm carrier and oxygen transfer medium. Oxygen diffuses directly through the membrane wall to the biofilm layer attached to the membrane surface, while wastewater flows outside the membrane. This unique reverse diffusion mass transfer mechanism enables oxygen transfer efficiency of over 90%, significantly reducing aeration energy consumption and promoting the simultaneous occurrence of nitrification and denitrification reactions, thereby improving nitrogen and phosphorus removal efficiency.

[0003] However, the porosity of existing homogeneous membrane fibers is fixed. During long-term operation, the biofilm on the surface of the membrane fibers continues to thicken, leading to increased oxygen mass transfer resistance. Especially when the water quality is complex, the denitrification efficiency drops significantly, and deep-layer microorganisms become inactive due to lack of oxygen, resulting in an imbalance between nitrification and denitrification. This phenomenon has become a problem that urgently needs to be solved by researchers in this field. Utility Model Content

[0004] The purpose of this invention is to provide a gradient porosity MABR membrane fiber assembly structure for existing devices, in order to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a gradient porosity MABR membrane fiber assembly structure, including a tube sheet, a hydrophobic layer is fixedly installed at the bottom of the tube sheet, a vertical support layer is fixedly attached to the inner wall of the hydrophobic layer, both the hydrophobic layer and the vertical support layer are permeated with pores, and the interior of the vertical support layer is permeated with through holes.

[0006] This experimental novel further illustrates that: the through hole has a conical structure, and the through hole with a larger diameter is opened at the end of the vertical support layer near the tube sheet.

[0007] This experimental novel further illustrates that the positions of the pores inside the hydrophobic layer and the vertical support layer correspond to each other.

[0008] This experimental novel further illustrates that the vertical support layer is unevenly distributed, with a lower pore density near the end of the tube sheet and a higher pore density away from the end of the tube sheet.

[0009] This experimental novel invention further illustrates that: an air duct interface is fixedly installed on the top of the tube sheet, and an air chamber is opened inside the tube sheet, with the air chamber and the through hole communicating with each other.

[0010] This experimental novel further illustrates that: a hydrophilic groove is provided on the outer wall of the end of the hydrophobic layer away from the tube sheet, the hydrophilic groove is disposed in the gap between the air pores, and the hydrophilic groove is arranged intersecting with the air pores.

[0011] This experimental novel further illustrates that: a bottom fixing plate is fixedly installed at the other end of the hydrophobic layer, the bottom fixing plate and the through hole are mutually circulated, and the bottom fixing plate and the tube plate are parallel to each other.

[0012] Compared with the prior art, the beneficial effects achieved by this utility model are: This utility model,

[0013] (1) By setting the diameter of the through hole near the tube sheet to be larger, and the tube sheet end is the air inlet end, the gas pressure near the tube sheet end is smaller, so the diameter of the through hole far from the air inlet end is smaller, so the cross-sectional area of ​​the channel near the air outlet end is reduced, and the gas compression causes the gas pressure to be greater than that at the air inlet end. Therefore, the oxygen content dissolved in the external water body per unit time will increase, which compensates for the problem of low dissolved oxygen due to the thickening of the biofilm at the end.

[0014] (2) By setting pores with different densities, the oxygen content is higher near the air inlet. Therefore, the pores with smaller densities can avoid excessive oxygen release in the initial stage, which leads to insufficient oxygen release at the end. The pores with larger densities at the air outlet can enhance the oxygen diffusion capacity at the end, compensate for the oxygen transfer attenuation caused by the thickening of the biofilm, avoid hypoxia at the end, promote the enrichment of denitrifying bacteria in the outer layer, strengthen simultaneous denitrification, and are more suitable for wastewater with low carbon-to-nitrogen ratio. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional structural schematic diagram of the present invention;

[0018] Figure 3 This is a schematic diagram of the membrane filament structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the hydrophobic layer structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the cross-sectional structure of the membrane filament of this utility model;

[0021] In the diagram: 1. Tube sheet; 2. Airway interface; 3. Air chamber; 4. Hydrophobic layer; 5. Air pores; 6. Vertical support layer; 7. Through hole; 8. Hydrophilic groove; 9. Bottom fixing plate. Detailed Implementation

[0022] The following detailed, non-limiting description of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] Example 1

[0024] A gradient porosity MABR membrane fiber assembly structure, as shown in the figure, includes a tube sheet 1. A hydrophobic layer 4 is fixedly installed at the bottom of the tube sheet 1. A vertical support layer 6 is fixedly attached to the inner wall of the hydrophobic layer 4. Both the hydrophobic layer 4 and the vertical support layer 6 are perforated with pores 5. A through hole 7 is perforated inside the vertical support layer 6.

[0025] The through-hole 7 has a conical structure. The diameter of the through-hole 7 opened at the end of the vertical support layer 6 near the tube sheet 1 is larger. During use, the diameter of the through-hole 7 at the end near the tube sheet 1 is larger. Since the end of the tube sheet 1 is the air inlet, the gas pressure at the end near the tube sheet 1 is lower. Therefore, the diameter of the through-hole 7 away from the air inlet is smaller. As a result, the cross-sectional area of ​​the channel near the air outlet is reduced. Gas compression causes the gas pressure to be greater than that at the air inlet. Therefore, the oxygen content dissolved in the external water body per unit time will increase, which compensates for the problem of low dissolved oxygen caused by the thickening of the biofilm at the end.

[0026] The positions of the pores 5 inside the hydrophobic layer 4 and the vertical support layer 6 are corresponding to each other. The gas introduced into the through hole 7 will permeate to the outside through the pores 5 and dissolve in the water body outside. The corresponding positions of the pores 5 and the pores 5 in the vertical support layer 6 prevent gas blockage from affecting the use of the device.

[0027] The vertical support layer 6 is unevenly distributed, with a smaller density of pores 5 near the end of the tube sheet 1 and a larger density of pores 5 further away from the tube sheet 1. The oxygen content is higher near the air inlet end, so the smaller density of pores 5 can prevent excessive oxygen release in the initial stage, which would lead to insufficient oxygen release at the end. The larger density of pores 5 at the air outlet end can enhance the oxygen diffusion capacity at the end, compensate for the oxygen transfer attenuation caused by the thickening of the biofilm, avoid hypoxia at the end, promote the enrichment of denitrifying bacteria in the outer layer, enhance simultaneous nitrogen removal, and is more suitable for wastewater with low carbon-to-nitrogen ratio.

[0028] Example 2

[0029] Similar to Embodiment 1, the difference is that an air duct interface 2 is fixedly installed on the top of the tube sheet 1, and an air chamber 3 is opened inside the tube sheet 1. The air chamber 3 and the through hole 7 are interconnected, and gas can be introduced into the through hole 7 from the air duct interface 2 and the air chamber 3. The air duct interface 2 facilitates the installation of a gas pump or other gas generating device. At the same time, the tube sheet 1 fixes multiple membrane filaments, improving the purification efficiency of water.

[0030] Example 3

[0031] Similar to Example 1, the difference is that a hydrophilic groove 8 is provided on the outer wall of the end of the hydrophobic layer 4 away from the tube sheet 1. The hydrophilic groove 8 is located in the gap between the air holes 5 and is arranged intersectingly with the air holes 5. At the end near the air outlet, the diameter of the internal through hole 7 becomes smaller and the number of air holes 5 on the surface increases, which may cause the biofilm to detach due to increased shear force. A small number of hydrophilic grooves 8 are provided on the surface of the hydrophilic groove 8 near the air outlet to enhance the adhesion of the biofilm to the device.

[0032] Example 4

[0033] Similar to Example 1, except that a bottom fixing plate 9 is fixedly installed at the other end of the hydrophobic layer 4. The bottom fixing plate 9 and the through hole 7 are mutually circulated. The bottom fixing plate 9 is parallel to the tube sheet 1. The bottom fixing plate 9 can fix the other end of the membrane fiber, which facilitates the overall installation of the membrane fiber.

[0034] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A gradient porosity MABR membrane filament module structure comprising a tube sheet (1) characterised in that: A hydrophobic layer (4) is fixedly installed at the bottom of the tube sheet (1). A vertical support layer (6) is fixedly attached to the inner wall of the hydrophobic layer (4). Both the hydrophobic layer (4) and the vertical support layer (6) are provided with pores (5). A through hole (7) is provided inside the vertical support layer (6).

2. The gradient porosity MABR membrane fiber module structure according to claim 1, characterized in that: The through hole (7) has a conical structure, and the through hole (7) opened on the end of the vertical support layer (6) near the tube sheet (1) has a larger diameter.

3. The gradient porosity MABR membrane fiber module structure according to claim 1, characterized in that: The positions of the pores (5) inside the hydrophobic layer (4) and the vertical support layer (6) correspond to each other.

4. The gradient porosity MABR membrane fiber module structure according to claim 1, characterized in that: The vertical support layer (6) is unevenly distributed, with a smaller density of pores (5) near the end of the tube sheet (1) and a larger density of pores (5) away from the end of the tube sheet (1).

5. The gradient porosity MABR membrane fiber module structure according to claim 1, characterized in that: An air duct interface (2) is fixedly installed on the top of the tube sheet (1), and an air chamber (3) is opened inside the tube sheet (1), and the air chamber (3) and the through hole (7) communicate with each other.

6. The gradient porosity MABR membrane fiber module structure according to claim 1, characterized in that: The hydrophobic layer (4) has a hydrophilic groove (8) on the outer wall of the end away from the tube sheet (1). The hydrophilic groove (8) is located in the gap between the air holes (5) and is arranged intersectingly with the air holes (5).

7. The gradient porosity MABR membrane fiber module structure according to claim 1, characterized in that: A bottom fixing plate (9) is fixedly installed at the other end of the hydrophobic layer (4). The bottom fixing plate (9) and the through hole (7) are mutually circulated. The bottom fixing plate (9) and the tube sheet (1) are parallel to each other.

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