Hollow fiber curtain membrane module for polishing wastewater treatment

Abstract

The utility model provides a kind of hollow fiber curtain type membrane module for grinding wastewater treatment, including fixed frame, hollow fiber membrane and aeration component, membrane fixed crossbeam is equipped in fixed frame inside, hollow fiber membrane and membrane fixed crossbeam are connected;Aeration component includes aeration main pipe and multiple aeration branch pipes, aeration main pipe is horizontally arranged in the inside of fixed frame bottom, aeration branch pipe is vertically communicated with aeration main pipe, and aeration branch pipe is set to the bottom of hollow fiber membrane, multiple aeration holes are vertically set in the length direction of aeration branch pipe side wall;Hollow fiber membrane includes upper water collector pipe, lower water collector pipe, hollow fiber membrane silk and turbulence support column, upper water collector pipe and lower water collector pipe are arranged in parallel, and hollow fiber membrane silk is equipped between the two, turbulence support column is spaced along the length direction of membrane silk, and two ends are fixed with upper water collector pipe, lower water collector pipe respectively, turbulence support column side wall is equipped with multiple convex points, and turbulence support column and hollow fiber membrane silk point contact limit cooperation.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment equipment technology, and more specifically, to a hollow fiber curtain membrane module for treating grinding wastewater. Background Technology

[0002] Membrane bioreactors (MBRs), as a highly efficient wastewater treatment technology, are widely used in industrial wastewater treatment due to their excellent solid-liquid separation capabilities and compact footprint. Hollow fiber curtain membrane modules, with their high packing density and superior filtration efficiency, have become the core filtration unit of MBR systems. In grinding wastewater treatment scenarios, because the wastewater contains a large number of fine metal or non-metal particles, and some particles easily combine with impurities in the water to form sticky pollutants, higher demands are placed on the antifouling capabilities and cleaning effects of hollow fiber curtain membrane modules.

[0003] However, existing hollow fiber curtain membrane modules generally suffer from the following problems when treating this type of grinding wastewater: 1. The hollow fiber membrane filaments in existing membrane modules lack an effective support structure. Under the action of aeration airflow and water flow, they are prone to excessive oscillation and mutual adhesion, leading to blockage of the membrane filament gaps. This not only weakens the self-cleaning ability of the membrane filaments themselves but also causes pollutants to accumulate in the gaps, further exacerbating the risk of blockage. 2. The aeration pipes of existing aeration modules mostly adopt a conventional open-hole design, and the aeration direction and airflow distribution lack specificity. The sprayed gas energy is dispersed, failing to form a concentrated and directional cleaning force. It is difficult to completely remove sticky pollutants attached to the surface of the membrane filaments, and a large amount of aeration energy is not effectively used for membrane filament cleaning, resulting in aeration waste and increased energy consumption. Ultimately, this affects the filtration flux and operational stability of the membrane module, increasing the operating cost and maintenance burden of grinding wastewater treatment. Utility Model Content

[0004] To address the aforementioned problems, the present invention provides a hollow fiber curtain membrane module for treating grinding wastewater, which solves the problems of poor cleaning effect and low cleaning efficiency of existing hollow fiber curtain membrane modules when treating grinding wastewater. It includes a fixed frame, hollow fiber membrane sheets, and an aeration assembly. A membrane fixing beam is provided inside the fixed frame, and the hollow fiber membrane sheets are connected to the membrane fixing beam. The aeration assembly includes an aeration main pipe and multiple aeration branch pipes. The aeration main pipe is horizontally positioned inside the bottom of the fixed frame. The aeration branch pipes are vertically connected to the aeration main pipe and are positioned corresponding to the bottom of the hollow fiber membrane. Multiple aeration holes are obliquely upward along the length of the sidewall of the aeration branch pipe. The hollow fiber membrane includes an upper water collection pipe, a lower water collection pipe, hollow fiber membrane fibers, and turbulence support columns. The upper water collection pipe and the lower water collection pipe are arranged parallel to each other, and hollow fiber membrane fibers are provided between them. The turbulence support columns are spaced apart along the length of the membrane fibers, and their two ends are fixed to the upper water collection pipe and the lower water collection pipe, respectively. Multiple protrusions are provided on the sidewall of the turbulence support columns, and the turbulence support columns and hollow fiber membrane fibers are in point contact limiting fit.

[0005] Preferably, a self-moving component is provided between adjacent hollow fiber membrane sheets, and the self-moving component is located directly above the corresponding aeration branch pipe. The self-moving component includes a fixed shaft and an elastic lever. The two ends of the fixed shaft are connected to the fixed frame, one end of the elastic lever is hinged to the fixed shaft, and the other end is close to the surface of the hollow fiber membrane filament.

[0006] Preferably, multiple sets of self-propelled components are arranged at intervals along the height direction of the hollow fiber membrane.

[0007] Preferably, the self-actuating assembly further includes limiting rings sleeved on both ends of the fixed shaft, the limiting rings cooperating with the elastic lever to limit its swing angle.

[0008] Preferably, the multiple aeration holes are evenly distributed at intervals along the length of the aeration branch pipe.

[0009] Preferably, the protrusions are spaced apart along the sidewall of the turbulence support column, and the protrusions face the gap between the hollow fiber membrane filaments.

[0010] Preferably, the elastic paddle is made of a corrosion-resistant and wear-resistant elastic material.

[0011] Preferably, the bottom of the fixed frame is provided with a drain trough, and the bottom of the drain trough is connected to a drain pipe.

[0012] The beneficial effects of this invention are as follows: The hollow fiber membrane includes a turbulence support column with multiple protrusions on its sidewall. The turbulence support column and the hollow fiber membrane filaments are in point-contact limiting cooperation, which prevents the membrane filaments from sticking together due to excessive aeration and water flow, reducing the obstruction to the free vibration of the membrane filaments and ensuring their self-cleaning ability. Furthermore, the protrusions on the sidewall generate micro-vortices, reducing the probability of clogging between membrane filaments and maintaining a long-term stable filtration flux for the membrane module. Multiple aeration holes are obliquely upward on the sidewall of the aeration branch pipe. The bubbles and airflow ejected from the aeration holes form an upward, impact-forced gas-liquid mixture that continuously washes away pollutants adhering to the surface of the hollow fiber membrane filaments, while simultaneously slowing down the deposition rate of pollutants on the membrane surface. Aeration is concentrated for membrane filament cleaning, improving cleaning efficiency and aeration utilization rate, reducing aeration waste, and saving energy. The aeration airflow drives the elastic paddle of the self-moving component to swing back and forth, removing pollutants that are difficult to remove by aeration alone from the surface of the membrane fibers. With the help of the limiting ring, the excessive swing of the paddle prevents damage to the membrane fibers, thus achieving all-round and three-dimensional cleaning of the membrane. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Symbols in the diagram: 1. Fixed frame; 2. Membrane fixing beam; 3. Hollow fiber membrane filament; 4. Turbulence support column; 401. Protrusion; 5. Main aeration pipe; 6. Aeration branch pipe; 601. Aeration hole; 7. Fixed shaft; 8. Elastic flap; 9. Limiting ring; 10. Upper water collection pipe; 11. Lower water collection pipe. Detailed Implementation

[0016] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0017] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 application and simplifying the description, 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 application.

[0018] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0019] The present application will now describe a hollow fiber curtain membrane module for treating grinding wastewater according to an embodiment of the present application.

[0020] Please see Figure 1This is a schematic diagram of the structure of the present invention. The hollow fiber curtain membrane module for treating grinding wastewater includes a fixed frame 1, hollow fiber membrane sheets, and an aeration assembly. A membrane fixing beam 2 is provided inside the fixed frame 1, connecting the hollow fiber membrane sheets to the membrane fixing beam 2 to ensure stability during aeration and filtration. The aeration assembly includes an aeration main pipe 5 and multiple aeration branch pipes 6. The aeration main pipe 5 is horizontally positioned inside the bottom of the fixed frame 1 for introducing gas. The aeration branch pipes 6 are vertically connected to the aeration main pipe 5 and are positioned corresponding to the bottom of the hollow fiber membrane sheets, allowing the gas to directly act on the main fouling areas of the membrane sheets. Multiple aeration holes 601 are obliquely upward along the length of the sidewalls of the aeration branch pipes 6. The bubbles and airflow ejected from the aeration holes 601 form an upward, impact-forced gas-liquid mixture that continuously washes away pollutants adhering to the surface of the hollow fiber membrane filaments 3, while simultaneously slowing down the deposition rate of pollutants on the membrane surface. Aeration is concentrated for membrane fiber cleaning, improving cleaning efficiency and aeration utilization, reducing aeration waste, and saving energy. The hollow fiber membrane includes an upper water collection pipe 10, a lower water collection pipe 11, hollow fiber membrane fibers 3, and turbulence support columns 4. The upper water collection pipe 10 and the lower water collection pipe 11 are arranged in parallel, with hollow fiber membrane fibers 3 between them, forming a curtain-like structure. The turbulence support columns 4 are spaced apart along the length of the membrane fibers, and their ends are fixed to the upper water collection pipe 10 and the lower water collection pipe 11, respectively. The sidewall of the turbulence support column 4 has multiple protrusions 401, and the turbulence support column 4 makes point contact with the hollow fiber membrane fibers 3 for limiting and positioning. Through point contact, the membrane fibers are stably supported while reducing the obstruction to the free vibration of the membrane fibers, ensuring the self-cleaning ability of the membrane fibers. At the same time, the structure of the protrusions 401 can generate local micro-vortices when the water flows through, reducing the probability of clogging between the membrane fibers and enabling the membrane module to maintain a long-term stable filtration flux.

[0021] Furthermore, a self-moving assembly is provided between adjacent hollow fiber membrane sheets, and the self-moving assembly is positioned directly above the corresponding aeration branch pipe 6. The self-moving assembly includes a fixed shaft 7 and an elastic lever 8. The two ends of the fixed shaft 7 are connected to the fixed frame 1, and one end of the elastic lever 8 is hinged to the fixed shaft 7, while the other end is close to the surface of the hollow fiber membrane filament 3. Specifically, the impact force of the gas-liquid mixture flow ejected from the aeration branch pipe 6 drives the elastic lever 8 to reciprocate around the fixed shaft 7, removing pollutants that are difficult to remove by aeration alone from the surface of the membrane filaments, thus improving the anti-fouling ability.

[0022] Furthermore, multiple sets of self-moving components are spaced apart along the height direction of the hollow fiber membrane to ensure that the membrane can be moved and cleaned in different height areas, achieving all-round and three-dimensional cleaning of the membrane.

[0023] Furthermore, the self-adjusting assembly also includes limiting rings 9 sleeved at both ends of the fixed shaft 7. The limiting rings 9 cooperate with the elastic lever 8 to limit its swing angle, preventing the elastic lever 8 from swinging excessively due to excessive airflow and avoiding damage to the membrane fibers.

[0024] Specifically, multiple aeration holes 601 are evenly distributed along the length of the aeration branch pipe 6 to ensure that the bubbles and airflow ejected from the aeration branch pipe 6 are evenly distributed on the membrane, thus avoiding the aggravation of local pollution caused by uneven aeration.

[0025] Specifically, the protrusions 401 are distributed at intervals along the side wall of the turbulence support column 4, and the protrusions 401 face the gap between the hollow fiber membrane filaments 3. The gap area between the membrane filaments is the area most prone to clogging, which enhances the cleaning and unblocking of the gap between the membrane filaments and improves the anti-clogging effect.

[0026] Specifically, the elastic paddle 8 is made of a corrosion-resistant and wear-resistant elastic material, enabling it to work stably for a long time in wastewater environments containing abrasive particles.

[0027] Specifically, the bottom of the fixed frame 1 is provided with a drain trough, and the bottom of the drain trough is connected to a drain pipe to collect pollutants and prevent them from circulating and accumulating inside the component.

[0028] The working process of this utility model is as follows: The grinding wastewater to be treated enters the fixed frame 1 and comes into full contact with the hollow fiber membrane. At the same time, the external aeration equipment introduces gas into the aeration main pipe 5 of the aeration assembly. The gas is evenly distributed to each aeration branch pipe 6 through the aeration main pipe 5, and then sprayed out through the aeration holes 601 on the aeration branch pipe 6, forming a gas-liquid mixture with an upward impact force to wash away the pollutants attached to the membrane fiber surface. Subsequently, the external suction equipment is connected to the upper water collection pipe 10 or the lower water collection pipe 11 of the hollow fiber membrane to form a negative pressure environment in the membrane fiber cavity. Under the action of negative pressure, the clean water in the grinding wastewater passes through the membrane wall of the hollow fiber membrane 3 and enters the membrane fiber cavity, realizing solid-liquid separation; while the solid pollutants in the wastewater are filtered to the outside of the membrane fiber. At the same time, the gas-liquid mixture simultaneously impacts the self-moving component between adjacent hollow fiber membranes. The airflow drives the elastic lever 8 to swing back and forth around the fixed shaft 7, removing pollutants attached to the membrane fiber surface that are difficult to remove by aeration alone. Pollutants settle into the drain tank under gravity and are periodically discharged to the outside of the components through the drain pipe.

[0029] In this invention, the hollow fiber membrane includes a turbulence support column 4. The sidewall of the turbulence support column 4 has multiple protrusions 401, and the turbulence support column 4 makes point-contact limiting contact with the hollow fiber membrane filaments 3. This prevents the membrane filaments from sticking together due to excessive aeration and water flow, reducing the obstruction to the free vibration of the membrane filaments and ensuring their self-cleaning ability. Furthermore, the protrusions 401 on the sidewall generate micro-vortices, reducing the probability of clogging between membrane filaments and maintaining a long-term stable filtration flux for the membrane module. The aeration branch pipe 6 has multiple upward-sloping aeration holes 601 on its sidewall. The bubbles and airflow ejected from the aeration holes 601 form an upward-flowing, impact-forced gas-liquid mixture that continuously washes away pollutants adhering to the surface of the hollow fiber membrane filaments 3, while simultaneously slowing down the deposition rate of pollutants on the membrane surface. Aeration is concentrated for membrane filament cleaning, improving cleaning efficiency and aeration utilization rate, reducing aeration waste, and saving energy. The aeration airflow drives the elastic paddle 8 of the self-moving component to swing back and forth, removing pollutants that are difficult to remove by aeration alone from the surface of the membrane fibers. In conjunction with the limiting ring 9, it prevents the paddle from swinging excessively and damaging the membrane fibers, thus achieving all-round and three-dimensional cleaning of the membrane.

[0030] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 application, and should all be included within the protection scope of this application.

Claims

1. A hollow fiber curtain membrane module for treating grinding wastewater, comprising a fixed frame, hollow fiber membrane sheets, and an aeration assembly, wherein a membrane sheet fixing beam is provided on the inner side of the fixed frame, and the hollow fiber membrane sheets are connected to the membrane sheet fixing beam; characterized in that: The aeration assembly includes a main aeration pipe and multiple branch aeration pipes. The main aeration pipe is horizontally arranged inside the bottom of the fixed frame. The branch aeration pipes are vertically connected to the main aeration pipe and are arranged corresponding to the bottom of the hollow fiber membrane. The sidewall of the branch aeration pipe has multiple aeration holes obliquely upward along its length. The hollow fiber membrane includes an upper water collection pipe, a lower water collection pipe, hollow fiber membrane fibers, and turbulence support columns. The upper water collection pipe and the lower water collection pipe are arranged parallel to each other, and the hollow fiber membrane fibers are arranged between them. The turbulence support columns are spaced apart along the length of the membrane fibers, and their two ends are fixed to the upper water collection pipe and the lower water collection pipe, respectively. The sidewall of the turbulence support column has multiple protrusions, and the turbulence support column and the hollow fiber membrane fibers are in point contact limiting fit.

2. The hollow fiber curtain membrane module for treating grinding wastewater as described in claim 1, characterized in that: A self-moving assembly is provided between adjacent hollow fiber membrane sheets, and the self-moving assembly is located directly above the corresponding aeration branch pipe. The self-moving assembly includes a fixed shaft and an elastic lever. The two ends of the fixed shaft are connected to the fixed frame, one end of the elastic lever is hinged to the fixed shaft, and the other end is close to the surface of the hollow fiber membrane filament.

3. The hollow fiber curtain membrane module for treating grinding wastewater as described in claim 2, characterized in that: Multiple sets of the self-adjusting components are spaced apart along the height direction of the hollow fiber membrane.

4. A hollow fiber curtain membrane module for treating grinding wastewater as described in claim 2, characterized in that: The self-actuating assembly also includes limiting rings sleeved at both ends of the fixed shaft, which cooperate with the elastic lever to limit its swing angle.

5. A hollow fiber curtain membrane module for treating grinding wastewater as described in claim 1, characterized in that: The multiple aeration holes are evenly distributed at intervals along the length of the aeration branch pipe.

6. The hollow fiber curtain membrane module for treating grinding wastewater as described in claim 1, characterized in that: The protrusions are spaced apart along the sidewall of the turbulence support column, and the protrusions face the gap between the hollow fiber membrane filaments.

7. A hollow fiber curtain membrane module for treating grinding wastewater as described in claim 2, characterized in that: The elastic paddle is made of a corrosion-resistant and wear-resistant elastic material.

8. A hollow fiber curtain membrane module for treating grinding wastewater as described in claim 1, characterized in that: The bottom of the fixed frame is provided with a sewage trough, and the bottom of the sewage trough is connected to a sewage pipe.

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