CN114147003B - Whole paper deinking method and device based on biological enzyme deinking - Google Patents

Whole paper deinking method and device based on biological enzyme deinking Download PDF

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Publication number
CN114147003B
CN114147003B CN202111210519.9A CN202111210519A CN114147003B CN 114147003 B CN114147003 B CN 114147003B CN 202111210519 A CN202111210519 A CN 202111210519A CN 114147003 B CN114147003 B CN 114147003B
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deinking
paper
unit
solution
enzyme
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CN114147003A (en
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周颖
李荐育
胡雨薇
龙维汉
伍丽燕
陈希
李杜白
王树恒
彭禹皎
罗淞文
王沅怡
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University of Electronic Science and Technology of China
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/0028—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by adhesive surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D9/00—Chemical paint or ink removers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Paper (AREA)

Abstract

The present invention relates to deinking technology. The invention aims to provide a whole paper deinking method and a device based on biological enzyme deinking, which can solve the problem that the existing equipment adopting the biological enzyme deinking method cannot be applied to scenes such as office areas, schools and/or families, and the like, and the technical scheme can be summarized as follows: firstly, flattening and fixing waste paper to enable the surface to be deinked to be upward; spraying or smearing biological enzyme deinking solution on the surface to be deinked, and waiting for a certain reaction time; finally, a sticky device is used to be attached to the surface of the waste paper to be deinked so as to remove the liquid containing carbon powder and/or impurities after deinking, thereby completing deinking. The invention has the advantages of easy realization and low cost, and is suitable for whole paper deinking.

Description

Whole paper deinking method and device based on biological enzyme deinking
Technical Field
The invention relates to a deinking technology, in particular to a whole paper deinking method and a whole paper deinking device based on biological enzyme deinking.
Background
The pulp and paper industry is one of the largest industries on earth. About 50% of the industrial lumbers in the world are now used for paper production. It is estimated that papermaking consumes 1800 ten thousand acres of forest per year, which equates to 20 football fields per minute. The large number of felled trees and industrial emissions presents serious environmental challenges. At present, the paper industry is actively promoting the utilization of waste paper, the waste paper is one of important renewable resources, and the waste paper enters a paper mill after being recycled and then is produced into paper pulp. However, such a resource reuse scheme does not solve all the problems because of the recycling system. The global average recycling rate of today's printed writing papers is only 8%, and besides the low recycling rate, another problem is the difficulty of sorting the used paper, in which the paper is mixed with other waste, which results in a reduction of the paper fiber quality.
Therefore, there is an urgent need for a method for directly deinking and recycling paper in the source of waste paper generation, such as office, school and/or home, so as to eliminate the long-line process of recycling and realize resource recycling.
The traditional paper regeneration process is chemical deinking regenerated paper, a large amount of chemical articles are required to be utilized for chemical deinking, high pollution load is caused, the biological enzyme method has the characteristics of low pollution, low energy consumption and higher efficiency, and is more in line with the environment protection concept in offices and household scenes.
Disclosure of Invention
The invention aims to provide a whole paper deinking method and a whole paper deinking device based on biological enzyme deinking, which can solve the problem that the existing equipment adopting the biological enzyme deinking method cannot be applied to scenes such as office areas, schools, families and the like.
The technical scheme adopted by the invention for solving the technical problems is that the whole paper deinking method based on biological enzyme deinking comprises the following steps:
step 1, flattening and fixing waste paper to enable the surface of the waste paper to be deinked to face upwards;
step 2, spraying or smearing a biological enzyme deinking solution on the surface to be deinked, and waiting for a certain reaction time; the biological enzyme deinking solution is an enzyme solution containing cellulase and xylanase, and the mass ratio of the cellulase to the xylanase in the enzyme solution is 1.8-2.2; the concentration of the cellulase in the enzyme solution is 0.8-1.2 mg/ml, and the concentration of the xylanase is 0.3-0.7 mg/ml; the enzyme solution is formed by dissolving enzyme in water or pH buffer solution;
at least one of the following is also satisfied:
a) The method comprises the following steps The temperature of the reaction in the step 2 is 10-50 ℃;
b) The method comprises the following steps The pH value of the enzyme solution is 4-8;
c) The method comprises the following steps The reaction time of the step 2 is not more than 40min;
and 3, adhering the waste paper to the surface to be deinked by using an adhesive device to remove the liquid containing carbon powder and/or impurities after deinking so as to finish deinking.
Specifically, in order to make the deinked paper directly usable, the method further comprises the following steps:
and 4, heating the deinked waste paper to evaporate liquid on the deinked waste paper so as to obtain deinked available paper.
Furthermore, in order to improve the reaction efficiency of the biological enzyme deinking solution, in step 2, the waste paper can be heated to reach the reaction temperature of the biological enzyme deinking solution after the biological enzyme deinking solution is sprayed or smeared.
Specifically, to illustrate the components of the bio-enzyme deinking solution, in step 2, the bio-enzyme deinking solution is: and enzyme solution containing pectinase and/or amylase and/or laccase and/or lipase.
More preferably, to provide a preferred bio-enzyme deinking solution, it is preferred that: cellulase: xylanase 2, concentration 1mg/ml:0.5mg/ml.
Further, in order to obtain suitable solution conditions, the enzyme solution is formed by dissolving the enzyme in water or a pH buffer. Preferably, the buffer solution may be at least one of a citric acid-disodium hydrogen phosphate buffer solution, a sodium acetate buffer solution, or a disodium hydrogen phosphate-sodium dihydrogen phosphate buffer solution.
Still further, to provide a preferred adhesive means, then in step 3, the adhesive means is preferably an adhesive roller.
The invention solves the technical problem, provides a whole paper deinking device based on biological enzyme deinking based on the whole paper deinking method of the invention, and the technical scheme is as follows: the whole paper deinking device based on biological enzyme deinking comprises a paper carrying plate, a spraying unit, a viscosity unit, a transmission unit, a control unit and a power unit, wherein the control unit is respectively connected with the power unit, the transmission unit and the spraying unit;
when the device is used, the control unit controls the power unit and the transmission unit to enable the spraying unit and the paper carrying plate to move relatively so as to enable the spraying unit to correspond to the position of the paper carrying plate, controls the spraying unit to spray the paper placing area, controls the power unit and the transmission unit to enable the viscous unit and the paper carrying plate to move relatively after a certain reaction time, enables the viscous unit to be attached to the paper placing area, and enables liquid containing carbon powder and/or impurities after deinking to be adhered to the paper placing area so as to finish deinking;
the biological enzyme deinking solution is an enzyme solution containing cellulase and xylanase, and the mass ratio of the cellulase to the xylanase in the enzyme solution is 1.8-2.2; the concentration of the cellulase in the enzyme solution is 0.8-1.2 mg/ml, and the concentration of the xylanase is 0.3-0.7 mg/ml; the enzyme solution is formed by dissolving enzyme in water or pH buffer solution;
at least one of the following is also satisfied:
a) The method comprises the following steps The temperature of the reaction in the step 2 is 10-50 ℃;
b) The method comprises the following steps The pH value of the enzyme solution is 4-8;
c) The method comprises the following steps The reaction time of the step 2 is not more than 40min.
Specifically, in order to enable the deinked paper to be directly used and improve the reaction efficiency of the biological enzyme deinking solution, the deinking device further comprises a heating unit, wherein the heating unit is connected with a control unit, and the control unit can control the heating unit to heat the paper placing area after deinking is completed so as to evaporate liquid on the paper placing area; the control unit can also control the heating unit to heat the paper placing area after the spraying of the spraying unit is finished so as to enable the paper placing area to reach the reaction temperature of the biological enzyme deinking solution.
Further, to illustrate the components of the biological enzyme deinking solution, the biological enzyme deinking solution is: enzyme solution also containing pectinase and/or amylase and/or laccase and/or lipase; to provide a preferred bio-enzyme deinking solution, it is preferred that: cellulase: xylanase 2 (weight ratio), concentration 1mg/ml:0.5mg/ml.
In particular, to provide a superior adhesive unit, the adhesive unit is preferably an adhesive roller.
Specifically, since not all areas of the waste paper to be deinked have ink traces, in order to save the bio-enzyme deinking solution, the device may further include a sensing unit connected to the control unit, and configured to determine an ink-containing area currently placed on the paper surface of the paper placement area and an area containing liquid and/or impurities of carbon powder after deinking on the paper surface when paper is placed in the paper placement area, wherein the control unit only sprays the ink-containing area when controlling the spraying unit to spray the paper placement area, and the control unit only controls the relative movement of the viscous unit and the paper-carrying plate to make the viscous unit adhere to the paper placement area, so that when the liquid and/or impurities containing carbon powder after deinking are adhered, the relative movement of the viscous unit and the paper-carrying plate is only made to make the viscous unit adhere to the area containing liquid and/or impurities of carbon powder after deinking on the paper surface.
The invention has the beneficial effects that in the scheme of the invention, the whole paper deinking method and the whole paper deinking device based on the biological enzyme deinking are provided, the operation is simple, the realization is easy, the volume of used equipment can be smaller, the waste paper is not required to be pulped, the factory environment is not required, and the method and the device can be suitable for scenes such as office areas, schools and/or families.
Drawings
FIG. 1 is a flow diagram of a whole paper deinking process based on biological enzyme deinking according to the present invention.
FIG. 2 is a schematic diagram of a whole paper deinking apparatus based on biological enzyme deinking in the embodiment of the present invention.
FIG. 3 is a schematic view of a bevel apparatus for verifying deinking effect of different enzymes in the example of the present invention.
FIG. 4 is a photograph demonstrating the paper design and experimental effect of a single roll experiment with different enzymes. A is a paper sheet which is taken once after being reacted for 40min by using a mixture of inactivated 1mg/ml cellulase and 0.5mg/ml xylanase (the buffer is sodium acetate solution pH = 4), and B is a paper sheet which is taken once after being reacted for 40min by using a mixture of active 1mg/ml cellulase and 0.5mg/ml xylanase (the buffer is sodium acetate solution pH = 4).
FIG. 5 deinking efficiency at room temperature of 1mg/ml cellulase (buffer is sodium acetate solution pH = 4) for different times. The inactivated enzyme (Cel-), and the active enzyme (Cel +).
FIG. 6 deinking efficiency of 0.5mg/ml xylanase (buffer sodium acetate solution pH = 4) at room temperature for different times. Inactive enzyme (Xyn-), active enzyme (Xyn +).
FIG. 7 deinking efficiency at room temperature for 1mg/ml lipase (buffer is sodium acetate solution pH = 4) for different times. Inactive enzyme (Lip-), active enzyme (Lip +).
FIG. 8 deinking effect of 1mg/ml laccase and 1mM ABTS mixed solution (buffer citric acid-disodium hydrogen phosphate buffer pH = 6) at room temperature for different time.
FIG. 9 deinking effect of 1mg/ml laccase and 10mM HBT mixed solution (buffer citric acid-disodium hydrogen phosphate buffer pH = 6) at room temperature for different time.
Figure 10, cellulase under different buffers: the deinking efficiency of the xylanase mixed enzyme solution is that A is the mixed enzyme solution of 1mg/ml cellulase and 0.5mg/ml xylanase, and the buffer solution is acetic acid-sodium acetate buffer solution; b is a mixed enzyme solution of 1mg/ml cellulase and 0.5mg/ml xylanase, and is dissolved in water; c is heat inactivation mixed enzyme liquid of 1mg/ml cellulase and 0.5mg/ml xylanase, and the buffer solution is acetic acid-sodium acetate buffer solution.
FIG. 11 is a graph showing the comparison of the effect before and after deinking of a paper by the method of the present invention. A is paper before deinking, and B and C are sequentially stuck to the same paper after the rolling times are increased. The enzyme for experiment is mixed enzyme liquid of cellulase and xylanase dissolved in water, and the paper is soaked in the enzyme liquid for reaction for 2min and then deinking is started.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the embodiments and the accompanying drawings.
The whole paper deinking method based on biological enzyme deinking of the invention has a flow chart shown in figure 1 and comprises the following steps:
step 1, flattening and fixing waste paper to enable the surface to be deinked to be upward;
step 2, spraying or smearing a biological enzyme deinking solution on the surface to be deinked, and waiting for a certain reaction time; the biological enzyme deinking solution is an enzyme solution containing cellulase and xylanase, and the mass ratio of the cellulase to the xylanase in the enzyme solution is 1.8-2.2; the concentration of the cellulase in the enzyme solution is 0.8-1.2 mg/ml, and the concentration of the xylanase is 0.3-0.7 mg/ml; the enzyme solution is formed by dissolving enzyme in water or pH buffer solution;
in order to further improve the deinking effect, at least one of the following is also satisfied:
a) The method comprises the following steps The temperature of the reaction in the step 2 is 10-50 ℃;
b) The method comprises the following steps The pH value of the enzyme solution is 4-8;
c) The method comprises the following steps The reaction time of the step 2 is not more than 40min;
and 3, adhering the waste paper to the surface to be deinked by using an adhesive device to remove the liquid containing carbon powder and/or impurities after deinking so as to finish deinking.
In order to make the deinked paper usable as it is, the following steps may be further included:
and 4, heating the waste paper after deinking to evaporate liquid on the waste paper so as to obtain the available paper after deinking.
In order to improve the reaction efficiency of the biological enzyme deinking solution, in step 2, the waste paper can be heated to reach the reaction temperature of the biological enzyme deinking solution after being sprayed or smeared with the biological enzyme deinking solution.
It is to be understood that the present invention is directed to whole paper deinking as opposed to the prior art processes of wastepaper shredding, post-pulping deinking. Regardless of size and shape, such paper forms the entire paper of the present invention, so long as it is of sufficient area to carry out the operations of the present invention thereon, and after deinking, subsequent writing, printing, or other use can be made.
To illustrate the components of the bio-enzyme deinking solution, in step 2, the bio-enzyme deinking solution may further contain at least one of pectinase, amylase, laccase or lipase; to provide a preferred bio-enzyme deinking solution, it is preferred that: cellulase: xylanase 2, concentration 1mg/ml:0.5mg/ml. The cellulase in the formula plays a main deinking role, the xylanase also can play a deinking role, and simultaneously the xylanase can degrade the lignin content in paper to a certain extent, so that the preservation time of the paper can be prolonged by reducing the lignin content of the paper, and the paper is not easy to turn yellow.
The parameters in the specific implementation are as follows: spraying 2-5ml of biological enzyme deinking solution on each piece of waste paper at the temperature of 10-50 ℃ and the pH value of 4-8, wherein the reaction time is generally not more than 40min. The waste paper can be mainly selected from laser printing waste paper. The preferred reaction time will vary depending on the formulation of the enzyme solution selected.
In order to provide a better adhesive device, in step 3, the adhesive device is preferably an adhesive roller, such as a commercially available removable roller hair sticking device, and a removable roller hair sticking device is used, which also brings about an effect that the adhesive layer thereon is covered and removable layer by layer, when the adhesive is not enough, the layer with insufficient adhesive can be removed without replacing the whole removable roller hair sticking device, and the removable roller hair sticking device needs to be replaced only after the adhesive layer on the whole removable roller hair sticking device is completely removed.
Because the adhesive device and the surface of the waste paper to be deinked are jointed with each other with different force, the adhesive device has different effects, if the force is lighter, the adhesive device is probably incapable of adhering liquid and/or impurities containing carbon powder after deinking, and if the force is heavier, the paper is probably damaged, so the jointing force is selected according to specific conditions.
The method of the invention can have various specific implementation routes and can be completed by using manual, semi-automatic equipment or automatic equipment.
Based on the whole paper deinking method of the biological enzyme deinking, the invention also provides a whole paper deinking device based on the biological enzyme deinking, which comprises a paper carrying plate, a spraying unit, a viscosity unit, a transmission unit, a control unit and a power unit, wherein the control unit is respectively connected with the power unit, the transmission unit and the spraying unit;
when the device is used, the control unit controls the power unit and the transmission unit to enable the spraying unit and the paper carrying plate to move relatively so as to enable the spraying unit to correspond to the position of the paper carrying plate, controls the spraying unit to spray the paper placing area, controls the power unit and the transmission unit to enable the viscous unit and the paper carrying plate to move relatively after a certain reaction time, enables the viscous unit to be attached to the paper placing area, and enables liquid and/or impurities containing carbon powder after deinking to be adhered to the viscous unit and/or the paper carrying plate to finish deinking;
wherein the biological enzyme deinking solution is an enzyme solution containing cellulase and xylanase, and the mass ratio of the cellulase to the xylanase in the enzyme solution is 1.8-2.2; the concentration of the cellulase in the enzyme solution is 0.8-1.2 mg/ml, and the concentration of the xylanase is 0.3-0.7 mg/ml; the enzyme solution is formed by dissolving enzyme in water or pH buffer solution;
at least one of the following is also satisfied:
a) The method comprises the following steps The temperature of the reaction in the step 2 is 10-50 ℃;
b) The method comprises the following steps The pH value of the enzyme solution is 4-8;
c) The method comprises the following steps The reaction time of the step 2 is not more than 40min.
Corresponding to the whole paper deinking method based on biological enzyme deinking, in order to enable the deinked paper to be directly used and improve the reaction efficiency of the biological enzyme deinking solution, the whole paper deinking method also comprises a heating unit, wherein the heating unit is connected with a control unit, and the control unit can control the heating unit to heat a paper placing area after deinking is completed so as to evaporate liquid on the paper placing area; the control unit can also control the heating unit to heat the paper placing area after the spraying of the spraying unit is finished or before the spraying or in the spraying process so as to enable the paper placing area to reach the reaction temperature of the biological enzyme deinking solution.
Corresponding to the above whole paper deinking method based on biological enzyme deinking, in order to illustrate the components of the biological enzyme deinking solution, the biological enzyme deinking solution is: mixed enzyme solution containing pectase and/or amylase and/or laccase and/or lipase; to provide a preferred bio-enzyme deinking solution, it is preferred that: cellulase: xylanase 2, concentration 1mg/ml:0.5mg/ml.
Corresponding to the above-mentioned whole paper deinking method based on bio-enzyme deinking, in order to provide a better viscosity unit, the viscosity unit is preferably a viscosity roller, such as a commercially available tearable roller hair sticker, and a tearable roller hair sticker is adopted, which also brings about an effect that a pasting layer thereon is covered layer by layer and tearable, when the viscosity is insufficient, the layer with insufficient viscosity can be torn off, and the whole tearable roller hair sticker does not need to be replaced, and the tearable roller hair sticker needs to be replaced only after the pasting layer on the whole tearable roller hair sticker is torn off, thereby reducing the frequency of replacing consumables in the whole device.
Corresponding to the above-mentioned whole paper deinking method based on bio-enzyme deinking, since the adhesive unit and the side of the waste paper to be deinked are bonded with different forces, which may result in different effects, if the force is relatively light, it is likely that the liquid and/or impurities containing carbon powder after deinking cannot be bonded, and if the force is relatively heavy, it may cause paper damage, then in step 3, when the above-mentioned tearable roller hair-sticking device is used for deinking laser printing paper, the force range of bonding the tearable roller hair-sticking device and the side of the printing paper to be deinked may be 1.20N to 1.80N.
The control unit only sprays the ink area when controlling the spraying unit to spray the paper placing area, and the control unit only controls the relative movement of the viscous unit and the paper carrying plate to ensure that the viscous unit is attached to the paper placing area so as to ensure that the viscous unit is attached to the paper placing area when the deinked liquid and/or impurities containing carbon powder are adhered to the paper placing area.
As known from the above-mentioned whole paper deinking device based on bio-enzyme deinking, the specific structure can be realized by various methods (as shown in FIG. 2, which is one of the realization methods), and can be reasonably derived by the skilled person according to the above description, which is a mature technology and will not be described in detail herein.
To further illustrate the process of the present invention, deinking experiments with different enzyme solutions are also provided. The enzymes used in the experiment were cellulase (Trichoderma viride) (CAS #9012-54-8, 50U/mg) from Shanghai-source phyllobacteria, xylanase (CAS #9025-57-4, 6000U/mg) from Shanghai-source phyllobacteria, lipase (CAS #9001-62-1,2 ten thousand U/g) from Mackin, and Lactase from Rhus vernificera (CAS #80498-15-3, 120U/g) from Shanghai-source phyllobacteria.
The above enzymes are respectively prepared in water, citric acid-disodium hydrogen phosphate buffer solution and sodium acetate buffer solution according to the use requirements, and HBT or ABTS is respectively selected as a mediator substance according to the use requirements. The reaction temperature was room temperature. The inactivated enzymes shown below and in the drawings of the specification were inactivated by treatment at a temperature exceeding the inactivation temperature of the enzyme, and were used mainly as controls.
Experiments for verifying deinking effect of different enzymes are presented herein. The experimental method is to divide a piece of A4 paper into small cells of the same size (see fig. 3 for the way of division), and 15 dots are arranged in each small cell in the same way. As shown in FIG. 4, the flat paper after the enzyme solution is fully soaked is adhered by using a slope device, and the ink dots are adhered by a sticking cylinder along the slope device which freely rolls down the slope from the paper, wherein the number of rolling-down times is only one. Taking a small cell as a sample, counting the number of residual ink points in each small cell, drawing a sample distribution curve by counting a large number of samples (> 300) under the same treatment, and calculating the average value of the samples. Double independent sample T-tests can be selected when comparing the statistical difference between inactivated and non-inactivated enzymes, and tests are performed comparing whether the mean of the overall effect of the two enzymes is significantly different (p <0.05 or p < 0.01).
The experimental results are shown in FIGS. 5 to 10, and the results show that the reaction time of various enzyme solutions is better under the condition of one-time rolling. If the cellulase solution is selected, the reaction time is generally not more than 40min; if a xylan solution is selected, the reaction time is generally not more than 30min; if a lipase solution is used, the reaction time is generally not more than 30min; if a laccase enzyme solution is chosen, the reaction time is generally not more than 20min using HBT mediators and not more than 40min using ABTS mediators. When the mixed enzyme of cellulase and xylanase is used, the reaction is preferably 20-40min. Finally, it was found that the mixed solution of cellulase and xylanase was the preferred enzyme solution for subsequent in-field deinking experiments on printing paper (concentration 1mg/ml:0.5 mg/ml).
Further introduces the field deinking experiment of printing paper. And spraying enzyme liquid which is preferably selected by an experiment on printing paper printed by a paved and fixed laser printer, wherein the enzyme liquid is used for wetting and thoroughly soaking a part needing deinking. After the reaction time reaches the required time, the paper is rolled for several times by using a sticky cylinder, and the ink is stuck off by the sticky cylinder. The contact force between the sticking cylinder and the paper is not obvious to damage paper fiber, and the liquid containing carbon powder and/or impurities after the enzyme liquid acts can be better stuck. The paper is then allowed to dry naturally.
The experimental result is shown in figure 11, and the result shows that the method can effectively remove the handwriting on the whole printing paper without obviously damaging the whole structure of the paper.

Claims (8)

1. The whole paper deinking method based on biological enzyme deinking is characterized by comprising the following steps:
step 1, flattening and fixing waste paper to enable the surface to be deinked to be upward;
step 2, spraying or smearing a biological enzyme deinking solution on the surface to be deinked, and waiting for a certain reaction time; the biological enzyme deinking solution is an enzyme solution containing cellulase and xylanase, and the mass ratio of the cellulase to the xylanase in the enzyme solution is 1.8-2.2; the concentration of the cellulase in the enzyme solution is 0.8-1.2 mg/ml, and the concentration of the xylanase is 0.3-0.7 mg/ml; the enzyme solution is formed by dissolving enzyme in water or pH buffer solution;
at least one of the following is also satisfied:
a) The method comprises the following steps The temperature of the reaction in the step 2 is 10-50 ℃;
b) The method comprises the following steps The pH value of the enzyme solution is 4-8;
c) The method comprises the following steps The reaction time of the step 2 is not more than 40min;
and 3, adhering the waste paper to the surface to be deinked by using an adhesive device to remove the liquid containing carbon powder and/or impurities after deinking so as to finish deinking.
2. The whole paper deinking method based on biological enzyme deinking as claimed in claim 1, further comprising:
and 4, heating the deinked waste paper to evaporate liquid on the deinked waste paper so as to obtain deinked available paper.
3. The process for deinking whole paper based on biological enzyme deinking according to claim 1, wherein in the step 2, the waste paper is heated to the reaction temperature of the biological enzyme deinking solution after the biological enzyme deinking solution is sprayed or applied.
4. The whole paper deinking method based on biological enzyme deinking as claimed in claim 1, wherein in step 2, the biological enzyme deinking solution is: and enzyme solution containing pectinase and/or amylase and/or laccase and/or lipase.
5. The whole paper deinking device based on biological enzyme deinking is characterized by comprising a paper carrying plate, a spraying unit, a viscosity unit, a transmission unit, a control unit and a power unit, wherein the control unit is respectively connected with the power unit, the transmission unit and the spraying unit;
when the device is used, the control unit controls the power unit and the transmission unit to enable the spraying unit and the paper carrying plate to move relatively so as to enable the spraying unit to correspond to the position of the paper carrying plate, controls the spraying unit to spray the paper placing area, controls the power unit and the transmission unit to enable the viscous unit and the paper carrying plate to move relatively after a certain reaction time, enables the viscous unit to be attached to the paper placing area, and enables liquid containing carbon powder and/or impurities after deinking to be adhered to the paper placing area so as to finish deinking;
the biological enzyme deinking solution is an enzyme solution containing cellulase and xylanase, and the mass ratio of the cellulase to the xylanase in the enzyme solution is 1.8-2.2; the concentration of the cellulase in the enzyme solution is 0.8-1.2 mg/ml, and the concentration of the xylanase is 0.3-0.7 mg/ml; the enzyme solution is formed by dissolving enzyme in water or pH buffer solution;
at least one of the following is also satisfied:
a) The method comprises the following steps The temperature of the reaction in the step 2 is 10-50 ℃;
b) The method comprises the following steps The pH value of the enzyme solution is 4-8;
c) The method comprises the following steps The reaction time of the step 2 is not more than 40min.
6. The whole paper deinking apparatus for biological enzyme deinking according to claim 5, further comprising a heating unit connected to the control unit, wherein the control unit controls the heating unit to heat the paper placement area to evaporate the liquid on the paper placement area after deinking is completed; the control unit can also control the heating unit to heat the paper placing area after the spraying of the spraying unit is finished so as to enable the paper placing area to reach the reaction temperature of the biological enzyme deinking solution.
7. The whole paper deinking apparatus based on biological enzyme deinking according to claim 5, wherein the biological enzyme deinking solution is: and enzyme solution containing pectinase and/or amylase and/or laccase and/or lipase.
8. The whole paper deinking apparatus based on biological enzyme deinking as claimed in claim 5, further comprising a sensing unit connected to the control unit for judging an ink-containing region currently placed on the paper surface of the paper placing region and a region containing liquid and/or foreign matter of the carbon powder after deinking on the paper surface when the paper is placed on the paper placing region, wherein the control unit only sprays the ink-containing region when controlling the spraying unit to spray the paper placing region, and the control unit only makes the viscous unit adhere to the paper placing region by controlling the relative movement of the viscous unit and the paper carrying plate so as to adhere the liquid and/or foreign matter of the carbon powder after deinking, and makes the viscous unit adhere to the region containing liquid and/or foreign matter of the carbon powder after deinking by controlling the relative movement of the viscous unit and the paper carrying plate.
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