Method for intelligently regulating and controlling pulping and filtering aiding of bio-enzyme

Abstract

The invention relates to the field of pulping and papermaking materials, and particularly provides an intelligent regulation and control bio-enzyme pulping filtration aiding method which comprises the following steps: continuously detecting the fiber dissociation degree alpha of pulp in a period T; controlling the activity of the biological enzyme according to the fiber dissociation degree alpha; wherein the biological enzyme is a biological enzyme coated by microcapsules. According to the method, the fiber dissociation degree alpha is detected in real time by setting a proper period T, whether the current fiber structure reaches the target level or not can be judged, excessive reaction or invalid reaction caused by fixed enzyme application is avoided, real-time performance and system burden can be considered in the gradual change process of the slurry structure, and the activity of biological enzyme is dynamically controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of pulping and papermaking. Specifically, the present invention provides a method for intelligently regulating bio-enzyme pulping and filtration aid. Background Art

[0002] Bioenzymes can break down adhesive bonds in fibers, making them easier to dissociate, improving fiber softness and beating efficiency, and are therefore often used in pulping. However, excessive enzymatic hydrolysis can produce excessive amounts of fine components and colloids in the fibers, leading to increased whitewater concentration below the wire, decreased filterability, reduced retention and dry strength of the finished paper, and even instability in the papermaking process. Therefore, bioenzyme regulation is necessary.

[0003] Currently, enzyme dosage is manually adjusted by measuring whitewater concentration or filtration time, or the enzyme dosage ratio is set based on pulp flow. However, this method suffers from long delays, lacks precise control, is unsuitable for continuous production, and cannot reflect the effectiveness of the reaction. Therefore, a method for intelligently regulating enzyme refining and filtration aids is urgently needed. Summary of the Invention

[0004] The present invention aims to solve at least one of the above problems.

[0005] The present invention provides a method for intelligently regulating bio-enzyme pulping and filtration aid, which comprises: continuously detecting the fiber dissociation degree α of the pulp within a period T; controlling the activity of the bio-enzyme according to the fiber dissociation degree α; wherein the bio-enzyme is a microcapsule-encapsulated bio-enzyme.

[0006] In the above technical solution, controlling the activity of the biological enzyme according to the fiber dissociation degree α includes: comparing the fiber dissociation degree α with the fiber dissociation degree threshold α 阈 Compare; control the activity of the biological enzyme based on the comparison results.

[0007] In any of the above technical solutions, controlling the activity of the biological enzyme according to the comparison result includes: if the fiber dissociation degree α is less than the fiber dissociation degree threshold α 阈 , controlling the activation activity of biological enzymes.

[0008] In any of the above technical solutions, if the fiber dissociation degree α is greater than the fiber dissociation degree threshold α 阈 , continuously detect the white water concentration N within the period t 白水 ; According to the white water concentration N 白水 Control the activity of biological enzymes.

[0009] In any of the above technical solutions, according to the white water concentration N 白水 Controlling the activity of biological enzymes includes: adjusting the white water concentration N 白水 and white water threshold concentration N 阈 Compare; control the activity of the biological enzyme based on the comparison results.

[0010] In any of the above technical solutions, controlling the activity of the biological enzyme according to the comparison result includes: if the white water concentration N 白水 Less than the white water threshold concentration N 阈 , control the activation activity of biological enzymes; if the white water concentration N 白水 Greater than the white water threshold concentration N 阈 , control the inhibitory activity of biological enzymes.

[0011] In any of the above technical solutions, the method for controlling the activation activity of the biological enzyme is to control the local rupture of the microcapsulated biological enzyme to release the biological enzyme; and / or the method for controlling the inhibition activity of the biological enzyme is to adjust the temperature and pH to inhibit the activity of the biological enzyme.

[0012] In any of the above technical solutions, the concentration of the slurry is 3-4%; and / or the beating degree of the slurry is 15-35°SR.

[0013] In any of the above technical solutions, the biological enzyme includes at least one of cellulase, hemicellulase, laccase and lipase, or a combination thereof.

[0014] After adopting the technical solution of the present invention, the technical effects that can be achieved are as follows: 1. By setting a suitable period T to monitor the fiber dissociation degree α in real time, the present invention can determine whether the current fiber structure has reached the target level, avoiding excessive or ineffective reactions caused by fixed enzyme application. It can balance real-time performance and system burden, and dynamically control the activity of the biological enzyme during the gradual change of the pulp structure. 2. The bio-enzyme is encapsulated in microcapsules. The microcapsules can prevent the bio-enzyme from being inactivated prematurely by high temperature, acid, alkali or shear, and can break the cell wall to release the bio-enzyme on demand, thus avoiding premature or continuous reaction. 3. Fiber dissociation threshold α 阈 It is a reference standard, equivalent to the target value, and the fiber dissociation degree α is less than the fiber dissociation degree threshold α 阈 When the fiber dissociation is insufficient, the biological enzyme can continue to increase the fiber dissociation degree α, so the activity of the biological enzyme needs to be activated; 4. White water concentration N 白水 It can reflect whether the by-components generated by dissociation are accumulated too much, and the white water concentration N 白水 The detection method is very mature and is a quantitatively measurable terminal indicator. It can accurately reflect the release of fine components caused by enzymes. The white water concentration N 白水 It is very suitable to be used together with the fiber dissociation degree α as an indicator for controlling the activity of biological enzymes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the intelligent control bio-enzyme pulping and filtration aid method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0016] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0017] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below.

[0019] In the related art, excessive enzymatic hydrolysis will cause the fibers to produce too many fine components and colloids, resulting in an increase in the concentration of white water under the mesh, a decrease in filtration aid, and a decrease in the retention rate and dry strength of the finished paper, and even instability in the papermaking process. Therefore, the dosage of the biological enzyme is usually manually adjusted by detecting the white water concentration or the filtration time, or the enzyme dosage ratio is set based on the pulp flow rate to avoid excessive enzymatic hydrolysis. However, this method has a large delay, cannot be precisely controlled, is not suitable for continuous production, and cannot reflect whether the reaction is effective.

[0020] In view of this, the present invention provides a method for intelligently regulating bio-enzyme pulping and filtration aid, which controls the activity of the bio-enzyme in the pulp by detecting the fiber dissociation degree α of the pulp.

[0021] Specifically, an embodiment of the present invention provides an intelligent regulation method for bio-enzyme pulping and filtration aid, which includes: continuously detecting the fiber dissociation degree α of the pulp within a period T; controlling the activity of the bio-enzyme according to the fiber dissociation degree α; wherein the bio-enzyme is a microcapsule-encapsulated bio-enzyme.

[0022] Preferably, the fiber dissociation degree α refers to the degree to which the fibers are dissociated into finer and more dispersed fibers during the pulping stage, reflecting the degree of dissociation of the fiber structure and the effect of the bio-enzyme treatment, and is an important parameter for measuring whether the bio-enzyme works effectively. During the pulping process, the action of the bio-enzyme will increase the degree of fiber dissociation, but excessive enzymatic hydrolysis will make the fibers too fine and increase the fine components, resulting in an increase in white water concentration and a decrease in filterability. By real-time detection of the fiber dissociation degree α, it is possible to determine whether the current fiber structure has reached the target level, thereby avoiding excessive or ineffective reactions caused by fixed enzyme application.

[0023] Preferably, since the fiber dissociation degree α has a dynamic change characteristic and will continue to change with the changes in refining time, working conditions, and pulp type, and the real-time control cost is too high, a suitable period T is set for data sampling and processing, which can take into account both real-time performance and system burden. In the process of gradual changes in pulp structure, the activity of biological enzymes can be dynamically controlled, and the period T is preferably 3-10 minutes.

[0024] Furthermore, the biological enzyme is a biological enzyme encapsulated in microcapsules. The microcapsules can prevent the biological enzyme from being inactivated prematurely due to high temperature, acid or alkali or before shearing, and break the wall to release the biological enzyme on demand, thereby avoiding premature or continuous reaction; once it is determined that the activity of the biological enzyme needs to be activated, the wall material of the microcapsule is punctured by shear force to release the biological enzyme; the wall material of the microcapsule is preferably a material that is sensitive to shear force, such as polyacrylate copolymers, gelatin-gum arabic copolymers, chitosan-polyvinyl alcohol complexes, etc.

[0025] In some implementations of the present invention, controlling the activity of the biological enzyme according to the fiber dissociation degree α includes: comparing the fiber dissociation degree α with the fiber dissociation degree threshold α 阈 Compare; control the activity of the biological enzyme based on the comparison results.

[0026] Preferably, the structure and dissociation degree of the fiber will affect the water filterability and paper quality, and the fiber dissociation degree threshold α is set. 阈 The fiber dissociation degree α and the fiber dissociation degree threshold α 阈 In comparison, it can actively correct the enzyme activity state guidance when the dissociation degree fluctuation approaches the critical state, so that the system automatically adjusts the activity of the biological enzyme to keep the fiber dissociation degree within the ideal range; the fiber dissociation degree threshold α 阈 The setting is made based on different raw pulp types and target paper filterability and strength requirements, which are not specifically limited here.

[0027] In some embodiments of the present invention, controlling the activity of the biological enzyme according to the comparison result includes: if the fiber dissociation degree α is less than the fiber dissociation degree threshold α 阈 , controlling the activation activity of biological enzymes.

[0028] Preferably, the enzyme mainly hydrolyzes the amorphous area or colloidal substance on the fiber surface during the refining process, making the fiber easier to dissociate and soften, increasing the fiber specific surface area, and facilitating paper bonding. That is, the role of the enzyme is to increase the fiber dissociation degree α; and the fiber dissociation degree threshold α 阈 It is a reference standard, equivalent to the target value, and the fiber dissociation degree α is less than the fiber dissociation degree threshold α 阈 When the fiber dissociation is insufficient, the bioenzyme can continue to increase the fiber dissociation degree α, so it is necessary to activate the activity of the bioenzyme; the fiber dissociation degree α is greater than the fiber dissociation degree threshold α 阈, the fiber dissociation degree α has reached the target value. At this time, if the activity of the biological enzyme is continued to be activated, it is still increasing the stimulation when it is sufficient or excessive. This is excessive control and will lose the stability and practical significance of the system. It will lead to excessive fine components in the pulp, increased white water concentration, decreased filterability, increased papermaking load, uneven paper structure, decreased physical strength and other problems.

[0029] Preferably, when the fiber dissociation degree is insufficient, that is, the fiber dissociation degree α is less than the fiber dissociation degree threshold α 阈 When grinding, the activity of the biological enzyme should be activated in the grinding section, that is, before the pulp enters the refining equipment, which can make the biological enzyme swell the fiber in advance, make it more susceptible to grinding, reduce the mechanical load, thereby improving the refining efficiency and reducing energy consumption.

[0030] Furthermore, the fiber dissociation degree α should be continuously detected within the period T and compared with the fiber dissociation degree threshold α 阈 If the comparison results for three or more consecutive times are all that the fiber dissociation degree α is less than the fiber dissociation degree threshold α 阈 , and then controlling the activity of the activated biological enzyme can reduce the error; if the fiber dissociation degree α is equal to the fiber dissociation degree threshold α 阈 Those skilled in the art can determine whether the activity of the biological enzyme needs to be activated based on actual conditions, and no specific limitation is made here.

[0031] In some implementations of the present invention, if the fiber dissociation degree α is greater than the fiber dissociation degree threshold α 阈 , continuously detect the white water concentration N within the period t 白水 ; According to the white water concentration N 白水 Control the activity of biological enzymes.

[0032] Preferably, the fiber dissociation degree α is a direct indicator of the degree of fiber dissociation, but it cannot reflect the accumulation of by-products. 阈 If the activation of the enzyme is stopped directly, the papermaking process may become unstable. Therefore, it is necessary to further consider the white water concentration N 白水 To determine whether it is necessary to continue activating the activity of the biological enzyme.

[0033] Preferably, if the effect of biological enzyme on fiber dissociation is too strong, it will cause excessive fine fibers, fine particles to fall off, and suspended components cannot be effectively retained, which will eventually lead to an increase in the solid content in the white water. Therefore, the white water concentration N 白水 It can reflect whether the by-components generated by dissociation are accumulated too much, and the white water concentration N 白水 The detection method is very mature and is a quantitatively measurable terminal indicator. It can accurately reflect the release of fine components caused by enzymes. The white water concentration N 白水It is very suitable to be used together with the fiber dissociation degree α as an indicator for controlling the activity of biological enzymes.

[0034] In some implementations of the present invention, according to the white water concentration N 白水 Controlling the activity of biological enzymes includes: adjusting the white water concentration N 白水 and white water threshold concentration N 阈 Compare; control the activity of the biological enzyme based on the comparison results.

[0035] Preferably, if the white water threshold concentration N is not set 阈 , it is impossible to clearly determine the current white water concentration N 白水 Whether it has exceeded the allowable range, making it impossible to determine how to control the activity of the biological enzyme; by setting the white water threshold concentration N 阈 , a clear discrimination boundary can be established, thereby achieving accurate, safe and stable regulation of enzyme activity; the white water threshold concentration N 阈 The settings are made according to different pulp raw materials and the type of paper to be made, and no specific restrictions are made here.

[0036] In some implementations of the present invention, controlling the activity of the enzyme according to the comparison result includes: if the white water concentration N 白水 Less than the white water threshold concentration N 阈 , control the activation activity of biological enzymes; if the white water concentration N 白水 Greater than the white water threshold concentration N 阈 , control the inhibitory activity of biological enzymes.

[0037] Preferably, the white water concentration N 白水 It reflects the level of loss of fine fibers and fillers. If there are many solids in the white water, it means that the loss of fine fibers is serious and the filter aid is ineffective. This is because excessive enzymatic hydrolysis leads to fiber shortening and fragmentation, which increases the number of fine components. It is difficult for fine particles to be effectively retained during papermaking and enter the white water system. These fine particles are difficult to be effectively retained during papermaking and will enter the white water system. Therefore, the activity of biological enzymes should be activated when the white water concentration is still low to continue to improve fiber dissociation. If the white water concentration is too high, it means that the enzymatic hydrolysis has been excessive and the activity of biological enzymes must be inhibited. If there are already many fine fibers in the white water and the enzyme continues to be released, it will cause more fine fibers / fillers to be lost, the burden on the white water system will increase, the water filtration performance will deteriorate, the paper machine will run unstably, the paper sheet structure will be loose, and the strength will decrease.

[0038] Preferably, by the white water concentration N 白水 Less than the white water threshold concentration N 阈 When controlling the activation activity of biological enzymes, the concentration of white water N 白水 Greater than the white water threshold concentration N 阈Controlling the biological enzyme inhibition activity can prevent excessive enzymatic hydrolysis, excessive microfibers, and filler loss, so that the system can be stabilized between the optimal dissociation and retention state, thereby maintaining water filterability and retention rate, and avoiding the continued addition of enzymes when there is no benefit or even a negative effect; at the white water concentration N 白水 Equal to the white water threshold concentration N 阈 When the enzyme is activated, those skilled in the art can determine whether the activity of the enzyme needs to be activated according to actual conditions, and no specific limitation is made here.

[0039] Furthermore, the white water concentration N should be continuously monitored within the period t. 白水 and the white water threshold concentration N 阈 Comparison, if the results of three consecutive comparisons are all white water concentration N 白水 Less than the white water threshold concentration N 阈 Or white water concentration N 白水 Greater than the white water threshold concentration N 阈 , and then control the activation or inhibition of the biological enzyme activity; if the three comparison results within the period t are inconsistent, the test should be continued until three consecutive identical comparison results appear and then the biological enzyme activity is controlled to reduce miscontrol; the period t is preferably 3-10 minutes; at the white water concentration N 白水 Less than the white water threshold concentration N 阈 At this time, the biological enzyme is activated in the mill exit section, that is, the pulp is activated after being refined. At this time, the amount of activated biological enzyme is small, and it only acts as an auxiliary on the loosened fibers, which can further dissociate and refine them, thereby optimizing the water filtration performance.

[0040] In some embodiments of the present invention, the activation activity of the enzyme is controlled by controlling the local rupture of the microcapsulated enzyme to release the enzyme; and / or the inhibition activity of the enzyme is controlled by adjusting the temperature and pH to inhibit the activity of the enzyme.

[0041] Preferably, since the biological enzyme used in the present invention is a microcapsule-coated biological enzyme, its wall material is preferably a shear-sensitive material such as polyacrylate copolymers, gelatin-arabic gum copolymers, chitosan-polyvinyl alcohol complexes, etc., and the microcapsule coating can protect the activity of the biological enzyme from being destroyed by temperature or pH; after determining that the activity of the biological enzyme needs to be activated, the shear force is locally increased in the mill inlet section or the mill outlet section, which can make the biological enzyme released only in the target process section and not diffuse to the entire system, thereby reducing ineffective enzyme consumption; the magnitude of the shear force is sufficient to exceed the rupture threshold of the microcapsule wall material, and the shear rate is preferably 500-1000s -1 After the microcapsules are broken, the biological enzymes are released into the slurry, activating their activity in hydrolyzing fiber bonds.

[0042] Preferably, biological enzymes are usually sensitive to temperature and pH, and their optimum activity temperature is usually in the range of 45-55°C and the optimum pH is usually in the range of 4.5-6.5. pH deviation from the optimum value will change the conformation and ionic state of the enzyme and significantly reduce its activity; therefore, when the fiber dissociation degree α is too high or the white water concentration N is too low, the enzyme will be degraded. 白水 When the temperature is high, the activity of the biological enzyme is usually inhibited by raising the temperature to 60-70°C or lowering it to below 30°C and / or adding alkali solution / buffer to quickly adjust the pH of the slurry. Temperature and pH regulation can achieve second-level feedback control, with a rapid response, which can quickly inhibit the activity of the biological enzyme. The structure of the biological enzyme is not destroyed and it can be activated again after the conditions are restored. This prevents the consumption of ineffective enzymes when the biological enzymes are not needed, thereby improving utilization efficiency.

[0043] In some implementations of the embodiments of the present invention, the concentration of the slurry is 3-4%; and / or the beating degree of the slurry is 15-35°SR.

[0044] Preferably, the mechanism of action of the biological enzyme is to catalyze the hydrolysis of cellulose and hemicellulose chains. If the pulp concentration is too low, the fibers are over-dispersed, the enzyme is easily diffused and lost, and the reaction efficiency is low. If the pulp concentration is too high, the pulp system is viscous, the enzyme is unevenly distributed, the mass transfer resistance increases, and local over-reaction or under-reaction is easy to occur. When the pulp concentration is 3-4%, the pulp has a certain fluidity but the fibers are dense enough, which is conducive to the combination of the biological enzyme and the fiber middle layer. Since the biological enzyme is a microcapsule-encapsulated biological enzyme, the rupture of the microcapsule wall material is triggered by shear force. If the pulp concentration is too low, the system shear is insufficient and the microcapsule cannot be effectively ruptured. A pulp with a concentration of 3-4% can produce more than 500s -1 The shear force is conducive to the directional activation of the enzyme; and in the process of controlling the activity of the enzyme, it is necessary to control the fiber dissociation degree α of the pulp and the white water concentration N 白水 For testing, the testing of these parameters requires the slurry to have a certain concentration stability, and the viscosity of the slurry at a concentration of 3-4% is moderate, ensuring fluid mechanics stability, which is conducive to the accurate collection and feedback control of the test parameters.

[0045] Furthermore, beating degree is a commonly used process indicator to measure the degree of fiber swelling, dissociation and refinement, and the essential goal of biological enzyme action is to enhance fiber softness and improve beating degree. If the range of beating degree is not controlled, biological enzyme and mechanical action may lead to excessive beating, resulting in too many short fibers and fine components, and a sharp decline in filterability; if the beating degree is too high, the fibers are severely cut, and a large amount of fine particles are generated, which will block the mesh structure and cause the white water concentration to rise. If the beating degree is too low, it means that the enzyme and mechanical action are insufficient, the pulp is insufficiently dissociated, the water filterability is poor, and the paper sheet bonding is poor. Therefore, controlling the beating degree within the range of 15-35°SR can control the degree of fiber dissociation, thereby maintaining filterability and controlling the generation of fine components.

[0046] In some embodiments of the present invention, the biological enzyme includes at least one of cellulase, hemicellulase, laccase and lipase, or a combination thereof.

[0047] Preferably, the main component of the pulp is plant fiber, mainly including cellulose, hemicellulose, lignin and other impurities. Cellulase can hydrolyze cellulose chains, decompose the fiber surface, promote fiber swelling and softening, thereby improving fiber flexibility and plasticity, enhancing beating efficiency, reducing mechanical beating energy consumption, improving inter-fiber bonding, and improving pulp filterability; hemicellulase can degrade the hemicellulose coated on the outer layer of cellulose, thereby loosening the fiber surface structure, facilitating hydration expansion, improving fiber cleavage efficiency during mechanical beating, reducing the generation of sticky impurities, and reducing white water viscosity; laccase can catalyze the oxidation of lignin and benzene ring substances , destroying its structural stability, effectively improving the wettability and hydrophilicity of the fiber surface, helping to peel off the bonding structure, release single fibers, reduce non-cellulose bonding between fibers, and improve beating efficiency; lipase can hydrolyze lipid substances, remove residual resin and lipid pollutants in the pulp, thereby improving the cleanliness of the fiber surface, reducing flocculation and retention caused by adhesive impurities, reducing floating objects in white water, and improving the dispersion and uniformity of the pulp in the papermaking process; by adopting the above-mentioned types of biological enzymes, the whole system can be realized from the fiber main chain, surface structure, bonding substances to lipid impurities, responding to the fiber dissociation degree α and white water concentration N respectively. 白水 By changing the process, the pulping and papermaking processes can be controlled in a continuous manner, thus improving the overall system efficiency.

[0048] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A method for intelligently regulating bio-enzyme pulping and filtration aid, characterized in that: The filter aid method comprises: Continuously detecting the fiber dissociation degree α of the pulp within a period T; controlling the activity of the biological enzyme according to the fiber dissociation degree α; Wherein, the biological enzyme is a microcapsule-encapsulated biological enzyme.

2. The filter aid method according to claim 1, wherein The controlling of the activity of the biological enzyme according to the fiber dissociation degree α comprises: The fiber dissociation degree α and the fiber dissociation degree threshold α 阈 Compare; The activity of the biological enzyme is controlled according to the comparison result.

3. The filter aid method according to claim 2, wherein: The controlling the activity of the biological enzyme according to the comparison result comprises: If the fiber dissociation degree α is less than the fiber dissociation degree threshold α 阈 , controlling the activation activity of the biological enzyme.

4. The filtration aid method according to claim 3, characterized in that: If the fiber dissociation degree α is greater than the fiber dissociation degree threshold α 阈 , continuously detect the white water concentration N within the period t 白水 ; According to the white water concentration N 白水 Control the activity of biological enzymes.

5. The filtration aid method according to claim 4, characterized in that: According to the white water concentration N 白水 Controlling the activity of biological enzymes includes: The white water concentration N 白水 and white water threshold concentration N 阈 Compare; The activity of the biological enzyme is controlled according to the comparison result.

6. The filtration aid method according to claim 5, characterized in that: The controlling the activity of the biological enzyme according to the comparison result comprises: If the white water concentration N 白水 Less than the white water threshold concentration N 阈 , controlling the activation activity of the biological enzyme; If the white water concentration N 白水 Greater than the white water threshold concentration N 阈 , controlling the inhibitory activity of the biological enzyme.

7. The filtration aid method according to claim 6, characterized in that: The method of controlling the activation activity of the biological enzyme is to control the local rupture of the biological enzyme coated by the microcapsule to release the biological enzyme; and / or The method of controlling the inhibitory activity of the biological enzyme is to adjust the temperature and pH to inhibit the activity of the biological enzyme.

8. The filtration aid method according to claim 1, wherein: The concentration of the slurry is 3-4%; and / or The beating degree of the slurry is 15-35°SR.

9. The filter aid method according to any one of claims 1 to 8, characterized in that: The biological enzyme includes at least one of cellulase, hemicellulase, laccase and lipase or a combination thereof.

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