A multi-stage filtering device for a bio-cellulose fermentation broth

Abstract

The utility model discloses a kind of biological cellulose fermentation liquor multistage filtering devices, belong to the field of bioengineering and microbial fermentation technology, it includes main tank body, the main tank body is by from top to bottom distribution coarse filter tank body, microfiltration tank body and ultrafiltration tank body composition, two tank bodies between adjacent are connected by the fixed sheet of outer wall annular array distribution, the microfiltration tank body and ultrafiltration tank body appearance are identical, hollow fiber membrane is set in the microfiltration tank body, for removing bacteria and suspended particles.The utility model is through from top to bottom three-grade filtration gradient design (coarse filter, microfiltration, ultrafiltration), realized from big particle residue to bacteria, suspended particles, again to macromolecular protein and pigment impurity's step-by-step fine separation, significantly improve fermentation liquor purification efficiency and filtrate quality;Meanwhile, the conical filter plate of coarse filter tank body built-in cooperation rotating blade and oblique scraper, can continuously push outwards in filtration process Retentate discharge, effectively prevent filter surface blockage.

Description

Technical Field

[0001] This utility model belongs to the field of bioengineering and microbial fermentation technology, specifically a multi-stage filtration device for biological cellulose fermentation broth. Background Technology

[0002] The multi-stage filtration device for bio-cellulose fermentation broth is a specialized filtration equipment designed for the characteristics of bio-cellulose (especially bacterial cellulose) fermentation broth. Its background technology primarily stems from the unique fermentation process and product characteristics of bio-cellulose. Bio-cellulose is typically produced by the fermentation of microorganisms such as Acetobacter xylinum on the surface of a liquid culture medium, forming a gel-like cellulose membrane with extremely high water content and a three-dimensional network structure.

[0003] Existing technologies for processing bio-cellulose fermentation broth generally face the problem of frequent clogging of filter components due to the high solid content and viscosity of the fermentation broth. This not only significantly reduces filtration efficiency but also forces frequent equipment shutdowns for manual disassembly and cleaning, severely impacting production continuity and efficiency. Simultaneously, traditional single-stage or simple filtration methods struggle to effectively separate impurities of different particle sizes, such as bacterial cells, large protein molecules, and pigments, resulting in unsatisfactory purification effects. Residues not only affect the purity of the final product but may also contaminate subsequent process equipment. Furthermore, existing devices lack efficient online self-cleaning mechanisms, and filter residues accumulate within the components, failing to be discharged promptly. This further exacerbates operational instability and maintenance costs, making it difficult to meet the actual needs of large-scale, automated production. Utility Model Content

[0004] To overcome the above-mentioned defects, this utility model provides a multi-stage filtration device for bio-cellulose fermentation broth, which solves the problems of low filtration efficiency and frequent shutdown maintenance caused by the high solid content and easy clogging of filter pores in bio-cellulose fermentation broth.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage filtration device for biocellulose fermentation broth, comprising a main tank, which is composed of a coarse filtration tank, a microfiltration tank, and an ultrafiltration tank distributed from top to bottom. Adjacent tanks are connected by fixed plates arranged in a ring array on the outer wall. The microfiltration tank has the same shape as the ultrafiltration tank. A hollow fiber membrane is provided inside the microfiltration tank for removing bacteria and suspended particles. A semi-permeable membrane is provided inside the ultrafiltration tank for removing large molecular proteins, pigments, and small molecular impurities.

[0006] The coarse filter tank has a tapered feed inlet at the top, a tapered filter plate is movably connected inside the coarse filter tank, and a filter residue cleaning mechanism is provided inside the coarse filter tank.

[0007] The filter residue cleaning mechanism includes a rotating blade rotatably connected to the center of the conical filter plate. The rotating blade includes three scraping arms arranged in an annular equidistant array. Each scraping arm is provided with several oblique scrapers, which are in close contact with the surface of the conical filter plate.

[0008] As a further embodiment of this utility model: a coupling is coaxially fixedly connected to the top axis of the rotating blade for transmission connection with the motor output shaft to drive the rotating blade.

[0009] As a further embodiment of this utility model: the bottom of the conical filter plate is obliquely fixedly connected to a drive port, and a cleaning box is rotatably connected to the other side of the drive port. A servo motor for driving the cleaning box to rotate is provided inside the drive port, and the output end of the servo motor is connected to the cleaning box for transmission.

[0010] As a further embodiment of this utility model: the top of the cleaning box is provided with a plurality of nozzles along its length, and the bottom is fixedly connected with a cleaning brush.

[0011] As a further embodiment of this utility model: the rotating blade is rotatably connected to the bottom of the bottom shaft of the conical filter plate, and the rotating joint is used to connect the cleaning box and the external water source to supply water to the nozzle.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] Through a top-down three-stage filtration gradient design (coarse filtration, microfiltration, and ultrafiltration), the system achieves progressively fine separation from large particulate residues to bacterial cells, suspended particles, and then to large molecular proteins and pigment impurities, significantly improving the purification efficiency of the fermentation broth and the quality of the filtrate. Simultaneously, the conical filter plate built into the coarse filtration tank, combined with rotating blades and an inclined scraper, continuously pushes the trapped material outwards during filtration, effectively preventing filter surface clogging. The flip-up cleaning box integrates a reverse flushing nozzle and a physical cleaning brush; the switching between these two functions achieves efficient self-cleaning of residue stuck in the filter pores of the conical filter plate, greatly reducing the frequency of manual disassembly and maintenance. The overall structure is compact and operates continuously and stably, meeting the automated processing requirements of high-solids-content biocellulose fermentation broth, significantly extending the service life of the membrane module, reducing operating costs, and providing an efficient and reliable technical solution for the large-scale purification of biocellulose products. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a three-dimensional structural diagram of the coarse filter tank of this utility model;

[0016] Figure 3 This is a three-dimensional structural diagram of the conical filter plate of this utility model;

[0017] Figure 4 This is a three-dimensional structural schematic diagram of the conical filter plate of this utility model from another perspective;

[0018] Figure 5 This is a three-dimensional structural diagram of the cleaning box of this utility model.

[0019] In the diagram: 1. Main tank; 11. Coarse filter tank; 12. Microfiltration tank; 13. Ultrafiltration tank; 2. Feed inlet; 3. Conical filter plate; 4. Filter residue cleaning mechanism; 41. Rotating blade; 411. Scraping arm; 412. Angled scraper; 42. Coupling; 43. Drive port; 44. Cleaning box; 45. Servo motor; 46. Nozzle; 47. Cleaning brush; 48. Rotary joint. Detailed Implementation

[0020] The technical solution of this utility model will be further described in detail below with reference to specific embodiments.

[0021] like Figures 1-5 As described above, this utility model provides a technical solution:

[0022] A multi-stage filtration device for bio-cellulose fermentation broth includes:

[0023] The main tank 1 consists of a coarse filtration tank 11, a microfiltration tank 12, and an ultrafiltration tank 13 distributed from top to bottom. Adjacent tanks are connected by fixed plates arranged in a ring on the outer wall. The microfiltration tank 12 and the ultrafiltration tank 13 have the same shape. The microfiltration tank 12 is equipped with a hollow fiber membrane for removing bacteria and suspended particles. The ultrafiltration tank 13 is equipped with a semi-permeable membrane for removing large molecular proteins, pigments, and small molecular impurities.

[0024] The coarse filter tank 11 has a concave feed inlet 2 at the top. A conical filter plate 3 is movably connected inside the coarse filter tank 11. A filter residue cleaning mechanism 4 is provided inside the coarse filter tank 11. The concave feed inlet 2 makes it easier for the fermentation liquid to enter the coarse filter tank 11. The conical design of the conical filter plate 3 makes large particles of residue more evenly distributed on the conical filter plate 3.

[0025] The filter cake cleaning mechanism 4 includes a rotating blade 41 rotatably connected to the center of the conical filter plate 3. The rotating blade 41 includes three annularly equidistant scraping arms 411, each with several oblique scrapers 412. The oblique scrapers 412 are in close contact with the surface of the conical filter plate 3. A coupling 42 is coaxially fixedly connected to the top axis of the rotating blade 41 for transmission connection with the motor output shaft to drive the rotating blade 41. A drive port 43 is obliquely fixedly connected to the bottom of the conical filter plate 3. A cleaning box 44 is rotatably connected to the other side of the drive port 43. A servo motor 45 for driving the cleaning box 44 is installed inside the drive port 43. The output end of the servo motor 45 is transmission connected to the cleaning box 44. Multiple nozzles 46 are arranged along the length of the top of the cleaning box 44, and a cleaning brush 47 is fixedly connected to its bottom. The rotating blade 41 is located on the conical filter plate. The bottom of the bottom shaft is rotatably connected to a rotating joint 48, which is used to connect the cleaning box 44 and an external water source to supply water to the nozzle 46. When the rotating blade 41 rotates, the inclined scraper 412 on its scraping arm 411 will continuously push large particles of residue on the surface of the conical filter plate 3 to the outer edge of the conical filter plate 3. Of course, the rotation direction of the rotating blade 41 needs to be controlled to be opposite to the tilting direction of the inclined scraper 412. The servo motor 45 in the drive port 43 can control the cleaning box 44 to rotate 180 degrees, so that the nozzle 46 and the cleaning brush 47 can fit against the bottom of the conical filter plate 3. When cleaning and maintaining the conical filter plate 3, the nozzle 46 can push out the filter residue stuck in the filter hole of the conical filter plate 3 in the opposite direction, while the cleaning brush 47 can physically remove the residue. The two are switched to clean, which can ensure the cleaning effect as much as possible.

[0026] The specific working principle of this utility model is as follows:

[0027] The integrated design of three-stage filtration and cleaning / maintenance solves the filtration problems of high solid content and easy clogging in biocellulose fermentation broth. Its working principle is as follows: The fermentation broth first enters the coarse filter tank 11, where a conical filter plate 3 intercepts large particles of residue. Simultaneously, a motor-driven rotating blade 41 drives an inclined scraper 412 to continuously push the trapped material to the edge for discharge, preventing clogging. When the filter pores become clogged, the cleaning box 44 flips under the control of a servo motor 45, switching the nozzle 46 for reverse flushing or physical cleaning with a brush plate, achieving efficient self-cleaning. Subsequently, the filtrate enters the microfiltration tank 12, where a hollow fiber membrane removes bacteria and suspended particles. Finally, it enters the ultrafiltration tank 13, where a semi-permeable membrane traps large molecular proteins, pigments, and other impurities, completing fine purification. The entire process is top-down, step-by-step separation, achieving continuous and automated processing from turbid fermentation broth to high-purity filtrate, significantly improving filtration efficiency and stability.

[0028] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A multi-stage filtration device for bio-cellulose fermentation broth, characterized in that, include: The main tank (1) is composed of a coarse filter tank (11), a microfiltration tank (12) and an ultrafiltration tank (13) distributed from top to bottom. Adjacent tanks are connected by fixed plates arranged in a ring array on the outer wall. The microfiltration tank (12) and the ultrafiltration tank (13) have the same shape. The microfiltration tank (12) is equipped with a hollow fiber membrane for removing bacteria and suspended particles. The ultrafiltration tank (13) is equipped with a semi-permeable membrane for removing large molecular proteins, pigments and small molecular impurities. The coarse filter tank (11) has a tapered feed inlet (2) at the top, a tapered filter plate (3) is movably connected inside the coarse filter tank (11), and a filter residue cleaning mechanism (4) is provided inside the coarse filter tank (11). The filter residue cleaning mechanism (4) includes a rotating blade (41) rotatably connected to the center of the conical filter plate (3). The rotating blade (41) includes three scraping arms (411) arranged in an equidistant ring. Each scraping arm (411) is provided with several oblique scrapers (412), and the oblique scrapers (412) are in close contact with the surface of the conical filter plate (3).

2. The multi-stage filtration device for bio-cellulose fermentation broth according to claim 1, characterized in that: The rotating blade (41) is coaxially fixedly connected to the top axis of the shaft by a coupling (42) for transmission connection with the motor output shaft to drive the rotating blade (41).

3. The multi-stage filtration device for biocellulose fermentation broth according to claim 2, characterized in that: The bottom of the conical filter plate (3) is fixedly connected to a drive port (43) at an angle. A cleaning box (44) is rotatably connected to the other side of the drive port (43). A servo motor (45) for driving the cleaning box (44) to rotate is provided inside the drive port (43). The output end of the servo motor (45) is connected to the cleaning box (44) in a transmission connection.

4. The multi-stage filtration device for biocellulose fermentation broth according to claim 3, characterized in that: The cleaning box (44) has multiple nozzles (46) arranged along its length on its top, and a cleaning brush (47) is fixedly connected to its bottom.

5. The multi-stage filtration device for biocellulose fermentation broth according to claim 4, characterized in that: The rotating blade (41) is rotatably connected to the bottom of the bottom shaft of the conical filter plate (3) and the rotating joint (48) is used to connect the cleaning box (44) and the external water source to supply water to the nozzle (46).

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