Solid-liquid separation filter assembly and plate filter press

Abstract

The utility model relates to solid -liquid separation technical field, concretely relates to a kind of solid-liquid separation filter assembly and plate filter press, the solid-liquid separation filter assembly includes inner layer filter cloth, outer layer filter cloth and filter aid layer;Inner layer filter cloth includes first inner layer and second inner layer, first inner layer and second inner layer are connected by inner layer transition section, and the middle part of inner layer transition section has through-hole;Outer layer filter cloth includes first outer layer and second outer layer, first outer layer and the second outer layer are connected by outer layer transition section, and the middle part of outer layer transition section has through-hole;Outer layer transition section is set in the through-hole of the inner layer transition section;First inner layer and second inner layer between setting filter plate, the outside of first inner layer is set first outer layer, and the outside of the second inner layer is set second outer layer.The utility model can avoid the problem of filter aid collapse, improve filtration efficiency;In addition, at least the removal step of filter aid in filter cake can be simplified, and filtration processing time is reduced.

Description

Technical Field

[0001] This utility model relates to the field of solid-liquid separation technology, specifically to a solid-liquid separation filtration component and a plate filter press. Background Technology

[0002] Fermentation broth is the liquid produced by the metabolism of microbial strains after inoculation into a liquid culture medium. It contains bacterial cells and secretions, and the bacterial cells need to be separated from the fermentation broth. The separation of bacterial cells is usually achieved using a pressure filtration process, such as a plate filter press.

[0003] The principle of separating fermentation broth using a plate filter press in existing technology is based on membrane filtration. However, for microorganisms, especially yeast, their particle size is small, making them prone to clogging the filter cloth during filtration. For example, Pichia pastoris has a particle size of approximately 4-6 micrometers, while Saccharomyces cerevisiae has a particle size of approximately 5-10 micrometers. Therefore, to avoid clogging the filter cloth, a filter aid is needed when filtering the fermentation broth. The filtration process includes: first, a pretreated liquid containing the filter aid is passed into the filter press. The filter aid is trapped in the filter chamber between the filter plates and, under the force of the water flow, fills the entire filter chamber. Then, the fermentation broth is passed in. Under the action of the filter aid, the microorganisms are trapped outside or inside the filter aid, thus preventing contact between the microorganisms and the filter cloth and avoiding clogging.

[0004] However, the above filtration method has certain drawbacks. Specifically, during the interval between the pretreatment liquid and the fermentation liquid, there is no liquid flow in the filter chamber. The filter aid loses its water flow effect and is therefore prone to collapse under gravity, resulting in a reduction or even absence of filter aid in the upper layer. This leads to some filter cloth being blocked during subsequent filtration, thus affecting the filtration efficiency.

[0005] In addition, the filter cake obtained after filtration using the above method contains a large amount of filter aid and yeast. In order to obtain yeast, the filter aid needs to be removed, which increases the processing time and processing cost. Utility Model Content

[0006] The purpose of this invention is to provide a solid-liquid separation filtration component and a plate filter press to solve the technical problems in the prior art where the filter aid is prone to collapse and the processing time and cost increase due to the need to remove the filter aid when separating small-particle-size microorganisms such as yeast using a plate filter press.

[0007] Terminology Explanation: Unless otherwise defined, all technical terms herein have the same meaning as commonly understood by one of ordinary skill in the art to which the subject matter of the claims pertains. Where multiple definitions exist for a term herein, the definition provided in this chapter shall prevail.

[0008] It should be understood that the above brief description and the following detailed description are exemplary and for illustrative purposes only, and do not limit the subject matter of this utility model in any way. In this utility model, unless otherwise specifically stated, the singular is used to include the plural. It should also be noted that unless otherwise stated, the use of “or” or “or” means “and / or”. Furthermore, the use of the term “comprising” and other forms such as “including,” “containing,” and “contains” are not limiting.

[0009] To achieve the above objectives, the technical solution of this utility model is as follows: In a first aspect, this utility model provides a solid-liquid separation filtration assembly, including an inner filter cloth, an outer filter cloth, and a filter aid layer disposed between the inner filter cloth and the outer filter cloth; The inner filter cloth includes a first inner layer and a second inner layer, which are connected by an inner layer transition section, and the middle of the inner layer transition section has a through hole. The outer filter cloth includes a first outer layer and a second outer layer, which are connected by an outer layer transition section, and the outer layer transition section has a through hole in the middle. The outer transition section is disposed within the through hole of the inner transition section; a filter plate is disposed between the first inner layer and the second inner layer, the first outer layer is disposed outside the first inner layer, and the second outer layer is disposed outside the second inner layer; The edges of the first inner layer and the first outer layer are sealed together; the edges of the second inner layer and the second outer layer are sealed together. The first inner layer and the first outer layer are connected by a number of connecting rods or connection points; The pore size of the inner filter cloth is smaller than that of the outer filter cloth; The filter aid layer is filled with filter aid, the particle size of the filter aid is not less than the pore size of the outer filter cloth, and the thickness of the filter aid layer is 3mm to 5mm. Both the inner and outer transition sections are made of soft plastic material, and the inner transition section and the inner filter cloth are connected by an adhesive process, as are the outer transition section and the outer filter cloth.

[0010] Furthermore, the connecting rods are discretely disposed in the planar region between the first inner layer and the first outer layer, and the two ends of the connecting rods have limiting knots, which extend outside the first inner layer or outside the first outer layer.

[0011] Furthermore, the connecting rod is made of plastic, and the thickness of the connecting rod is less than the thickness of the filter aid layer.

[0012] Furthermore, the connection points are discretely disposed within a planar region between the first inner layer and the first outer layer; the connection points are formed by an adhesive bonding process.

[0013] Furthermore, the particle size of the filter aid is one or more of 50 micrometers, 100 micrometers, and 150 micrometers.

[0014] Furthermore, the pore size of the inner filter cloth is 5 ± 0.5 micrometers.

[0015] Furthermore, the pore size of the outer filter cloth is 50±5 micrometers.

[0016] Furthermore, the filter press includes a frame and two filter screens inside the frame, the two filter screens and the frame forming a structure with a hollow cavity; the filter screens have through holes in the middle, and the inner transition section and the outer transition section are arranged in the through holes of the filter press; a confluence hole is arranged below the frame; the confluence hole is connected to the hollow cavity; The plate frame is also provided with a compressed air inlet, which is connected to the hollow cavity.

[0017] On the other hand, this utility model also provides a plate filter press, comprising: Multiple filter components as described above are arranged in a linear array to form a filter press plate group; a pressing plate is provided at one end of the filter press plate group and a thrust plate is provided at the other end. A pressing assembly, used to push the pressing plate and press the filter plate assembly together; The main beam is located on both sides of the filter press plate assembly and is used to connect the pressing plate and the thrust plate, and also to support the filter press plate assembly. A base, on which the pressing assembly and the main beam are mounted.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The solid-liquid separation filtration assembly provided by this utility model consists of two layers of filter cloth with a filter aid layer placed between them. This eliminates the need for pretreatment liquid to fill the filter aid in subsequent filtration processes, as the filter aid is sandwiched between the two layers of filter cloth, thus preventing filter aid collapse and improving filtration efficiency. Furthermore, the absence of filter aid collapse also prevents filter cloth clogging. Additionally, the filter cloth provides a certain density to the filter aid, further increasing filtration efficiency. The dense filter aid ensures that most of the filtered yeast remains outside the outer filter cloth, thus eliminating or simplifying the step of removing the filter aid from the filter cake. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0020] Figure 1 This is a schematic diagram of the filter assembly. Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle; Figure 3 This is a schematic diagram of the planar structure of a filter press plate; Figure 4 This is a top-view structural diagram of a plate filter press; Figure 5 This is a schematic diagram of a filter press assembly consisting of multiple filter components. The arrows in the diagram indicate the direction of liquid flow.

[0021] Explanation of reference numerals in the attached figures: 1. Inner filter cloth, 101. First inner layer, 102. Second inner layer, 103. Inner layer transition section, 2. Outer filter cloth, 201. First outer layer, 202. Second outer layer, 203. Outer layer transition section, 3. Filter aid layer, 4. Connecting rod, 5. Limiting joint, 6. Filter press plate, 7. Manifold, 8. Pressing plate, 9. Thrust plate, 10. Pressing assembly, 11. Main beam, 12. Liquid inlet pipe, 13. Liquid outlet pipe, 14. Compressed air inlet. Detailed Implementation

[0022] The technical solution of this utility model will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] It should be noted that, unless otherwise specifically stated, the relative arrangement and numerical expressions of the components and steps described in these embodiments should not be construed as limiting the scope of this utility model.

[0024] The following description of exemplary embodiments is merely illustrative and is not intended to limit the present invention or its application or use in any way. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail herein, but where applicable, such techniques, methods, and apparatus should be considered part of this specification.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] For ease of description, the words "up," "down," "left," and "right" appearing in this utility model only indicate that they are consistent with the up, down, left, and right directions of the accompanying drawings. They do not limit the structure and are merely for the purpose of facilitating the description of this utility model and simplifying the description. They do not indicate or imply that the device or component 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.

[0027] Terminology Explanation: The terms "installation," "connection," "linking," and "fixing" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction relationship between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0028] Example 1 This embodiment provides a solid-liquid separation filtration component, such as... Figure 1 and Figure 2 As shown, it includes an inner filter cloth 1, an outer filter cloth 2, and a filter aid layer 3 disposed between the inner filter cloth 1 and the outer filter cloth 2; the inner filter cloth 1 includes a first inner layer 101 and a second inner layer 102, the first inner layer 101 and the second inner layer 102 are connected by an inner layer transition section, and the middle part of the inner layer transition section has a through hole; The outer filter cloth 2 includes a first outer layer 201 and a second outer layer 202, which are connected by an outer layer transition section. The outer layer transition section has a through hole in the middle. The outer layer transition section is disposed in the through hole of the inner layer transition section. A filter press 6 is disposed between the first inner layer 101 and the second inner layer 102. The first outer layer 201 is disposed on the outside of the first inner layer 101, and the second outer layer 202 is disposed on the outside of the second inner layer 102.

[0029] The inner transition section is located at the center of the inner filter cloth 1, and the outer transition section is located at the center of the outer filter cloth 2.

[0030] The edges of the first inner layer 101 and the first outer layer 201 are sealed together; the edges of the second inner layer 102 and the second outer layer 202 are also sealed together. The sealing connection can be achieved through a sewing process or other existing technologies such as adhesive bonding.

[0031] The first inner layer 101 and the first outer layer 201 are connected by a plurality of connecting rods 4. The connecting rods 4 are discretely arranged in the planar region between the first inner layer 101 and the first outer layer 201, and each connecting rod 4 has a limiting knot 5 at both ends, which extends outside the first inner layer 101 or the first outer layer 201. The connecting rods 4 are made of plastic, and the thickness of the connecting rods 4 is less than the thickness of the filter aid layer 3. The connecting rods 4 can achieve an equal spacing between the outer filter cloth 2 and the inner filter cloth 1, avoiding excessive spacing in some areas due to the softness of the filter cloth, which would affect the distribution of the filter aid.

[0032] In other embodiments, the connecting rod 4 can also be replaced by a connection point, specifically: the first inner layer 101 and the first outer layer 201 are connected by a plurality of connection points, the connection points being discretely arranged in the planar region between the first inner layer 101 and the first outer layer 201; the connection points are formed by an adhesive bonding process.

[0033] In this embodiment, when used for yeast filtration, particularly Pichia pastoris and Saccharomyces cerevisiae, the thickness of the filter aid layer 3 is 3 mm to 5 mm. The pore size of the inner filter cloth 1 is smaller than that of the outer filter cloth 2; specifically, the pore size of the inner filter cloth 1 is 5 ± 0.5 micrometers. The pore size of the outer filter cloth 2 is 50 ± 5 micrometers.

[0034] The inner filter cloth 1 is set with a pore size that is similar to the diameter of the yeast to be filtered, so as to prevent the yeast from passing through the inner filter cloth 1 and achieve final interception; the outer filter cloth 2 is set with a larger pore size, but smaller than the particle size of the filter aid, so as to prevent the yeast from clogging the outer filter cloth 2 and also to prevent the filter aid from leaking out.

[0035] The filter aid layer 3 is filled with filter aid, the particle size of which is not less than the pore size of the outer filter cloth, and the particle size of which is one or more of 50 micrometers, 100 micrometers, and 150 micrometers. If the filter aid is set as a mixture of filter aids with different particle sizes, an uneven distribution of pore sizes can be formed, thereby balancing clogging and filtration efficiency and avoiding increased filtration time due to excessively dense filter aid.

[0036] The inner transition section 103 and the outer transition section 203 are both made of soft plastic material, and the inner transition section 103 and the inner filter cloth 1 are connected by an adhesive process, and the outer transition section 203 and the outer filter cloth 2 are connected by an adhesive process.

[0037] like Figure 3 As shown, the filter press plate 6 has a through hole in the middle, the inner diameter of which allows the filter assembly to pass through when retracted. The filter press plate 6 has an inner transition section 103 and an outer transition section 203 within the through hole. Furthermore, the filter press plate 6 is a hollow filter press plate, with filter screens on both sides of the hollow cavity and an inner filter cloth on the outer side of the filter screens. After the liquid passes through the filter assembly, the remaining liquid passes through the filter screens and enters the hollow cavity. A manifold 7 is provided at the bottom of the filter press plate 6, located on the edge of the filter press plate 6. When all the filter press plates 6 are compressed, the manifold 7 forms a connected channel. Each manifold 7 is connected to the hollow cavity of the same filter press plate 6. The filtered liquid enters the manifold 7 from the hollow cavity and is discharged through the manifold 7, achieving solid-liquid separation.

[0038] Furthermore, to prevent the filter aid layer 3 of the filter assembly from affecting the compression and sealing of the filter press plate 6, the edge sealing lines of the inner filter cloth 1 and the outer filter cloth 2 have the same shape as the inner edge of the frame of the filter press plate 6, and the overall size of the edge sealing lines is adapted to the inner area of ​​the filter press plate frame. At the same time, outside the edge sealing lines of the inner filter cloth 1 and the outer filter cloth 2, a certain width is left for the subsequent binding of the filter cloths on both sides of the filter press plate 6. Therefore, after adjacent filter press plates 6 are compressed, only filter cloth exists between them, without any filter aid, resulting in a completely sealed contact between adjacent filter press plates 6 under the pressure.

[0039] Each filter press plate 6 is also provided with a compressed air inlet 14 on one side, which is connected to the hollow cavity to facilitate the subsequent compaction of the bacterial sludge.

[0040] Example 2 This embodiment provides a plate filter press, such as Figure 4 As shown, it includes: Multiple filter components as described above are arranged in a linear array to form a filter press plate group; a pressing plate 8 is provided at one end of the filter press plate group and a thrust plate 9 is provided at the other end. The pressing assembly 10 is used to push the pressing plate 8 and press the filter plate assembly together. The main beam 11 is arranged on both sides of the filter press plate assembly, and is used to connect the pressing plate 8 and the thrust plate 9, and also to support the filter press plate assembly. The base on which the pressing assembly 10 and the main beam 11 are disposed.

[0041] The working principle and usage process of this embodiment are as follows: Before filtration, half of the filter assembly is passed through the through hole of the filter press plate 6 to assemble the filter assembly with the filter press plate 6. The filter assemblies on both sides of the same filter press plate 6 are fixed and tied using cable ties or other existing methods (the tying position can be outside the filter press plate 6, using a certain width of filter cloth reserved outside the edge sealing line of the inner filter cloth 1 and the outer filter cloth 2). Then, the plate filter press is assembled according to the conventional assembly structure of a plate filter press. The pressing assembly 10 pushes the pressing plate 8, which presses the individual filter press plates 6 within the filter press plate assembly tightly. In the pressed state, the edges of adjacent filter press plates 6 are in a tightly sealed state. There is a certain gap between the filter assemblies on adjacent filter press plates 6, forming a filtration space and an interception and retention space for the yeast fermentation broth.

[0042] A liquid inlet pipe 12 and a liquid outlet pipe 13 are also provided on one side of the thrust plate 9. The liquid inlet pipe 12 is connected to the through holes of the filter components in the filter press assembly, such as... Figure 5 As shown, during the filtration of yeast fermentation broth, the broth enters the filter press assembly through the inlet pipe 12, and then passes through the through-holes into the interception and retention spaces of each yeast cell (sludge). The fermentation broth then passes sequentially through the outer filter cloth 2, the filter aid layer 3, the inner filter cloth 1, and the inner cavity of the filter press 6. During this process, the yeast is intercepted outside the outer filter cloth 2, or partially intercepted within the filter aid layer 3; the remaining liquid enters the inner cavity of the filter press 6, and then flows through the confluence hole 7 below the filter press 6, finally being discharged through the outlet pipe. This achieves solid-liquid separation.

[0043] To obtain more yeast fermentation filtrate, the bacterial sludge can be compressed into a filter cake. The specific method is as follows: compressed air is blown into the hollow cavity of the filter press plate 6 through the compressed air inlet 14 on one side of the filter press plate 6. The air flows outward from the inner cavity of the filter press plate 6 through the inner filter cloth 1, the filter aid layer 3, and the outer filter cloth 2 in sequence. Under the action of high pressure air, the inner filter cloth 1 and the outer filter cloth 2 expand away from the filter press plate 6, thereby squeezing the bacterial sludge between adjacent filter components to form a filter cake.

[0044] The above specific embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A solid-liquid separation filtration assembly, characterized in that, It includes an inner filter cloth, an outer filter cloth, and a filter aid layer disposed between the inner filter cloth and the outer filter cloth; The inner filter cloth includes a first inner layer and a second inner layer, which are connected by an inner layer transition section, and the middle of the inner layer transition section has a through hole. The outer filter cloth includes a first outer layer and a second outer layer, which are connected by an outer layer transition section, and the outer layer transition section has a through hole in the middle. The outer transition section is disposed within the through hole of the inner transition section; a filter plate is disposed between the first inner layer and the second inner layer, the first outer layer is disposed outside the first inner layer, and the second outer layer is disposed outside the second inner layer; The edges of the first inner layer and the first outer layer are sealed together; the edges of the second inner layer and the second outer layer are sealed together. The first inner layer and the first outer layer are connected by a number of connecting rods or connection points; The pore size of the inner filter cloth is smaller than that of the outer filter cloth; The filter aid layer is filled with filter aid, the particle size of the filter aid is not less than the pore size of the outer filter cloth, and the thickness of the filter aid layer is 3mm to 5mm. Both the inner and outer transition sections are made of soft plastic material, and the inner transition section and the inner filter cloth are connected by an adhesive process, as are the outer transition section and the outer filter cloth.

2. The solid-liquid separation filtration assembly according to claim 1, characterized in that, The connecting rods are discretely disposed in the planar region between the first inner layer and the first outer layer, and the two ends of the connecting rods have limiting knots, which extend outside the first inner layer or outside the first outer layer.

3. The solid-liquid separation filtration assembly according to claim 2, characterized in that, The connecting rod is made of plastic, and the thickness of the connecting rod is less than the thickness of the filter aid layer.

4. The solid-liquid separation filtration assembly according to claim 1, characterized in that, The connection points are discretely disposed in the planar region between the first inner layer and the first outer layer; the connection points are formed by an adhesive bonding process.

5. The solid-liquid separation filtration assembly according to claim 1, characterized in that, The filter aid has a particle size of one or more of 50 micrometers, 100 micrometers, and 150 micrometers.

6. The solid-liquid separation filtration assembly according to claim 1, characterized in that, The pore size of the inner filter cloth is 5 ± 0.5 micrometers.

7. The solid-liquid separation filtration assembly according to claim 1, characterized in that, The outer filter cloth has a pore size of 50±5 micrometers.

8. The solid-liquid separation filtration assembly according to claim 1, characterized in that, The filter press includes a frame and two filter screens inside the frame, the two filter screens and the frame forming a structure with a hollow cavity; the filter screens have through holes in the middle, and the inner transition section and the outer transition section are arranged in the through holes of the filter press; a confluence hole is arranged below the frame; the confluence hole is connected to the hollow cavity; The plate frame is also provided with a compressed air inlet, which is connected to the hollow cavity.

9. A plate filter press, characterized in that, include: The filter assembly according to any one of claims 1-8, wherein the filter assembly is arranged in a linear array to form a filter press assembly; The filter press plate assembly is provided with a pressing plate at one end and a thrust plate at the other end; A pressing assembly, used to push the pressing plate and press the filter plate assembly together; The main beam is located on both sides of the filter press plate assembly and is used to connect the pressing plate and the thrust plate, and also to support the filter press plate assembly. A base, on which the pressing assembly and the main beam are mounted.

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