CN112726254A - Method for preparing natural-color biomechanical pulp by using hot water treatment and biological enzyme treatment of wheat straw and fully utilizing byproducts - Google Patents
Method for preparing natural-color biomechanical pulp by using hot water treatment and biological enzyme treatment of wheat straw and fully utilizing byproducts Download PDFInfo
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- CN112726254A CN112726254A CN202011640961.0A CN202011640961A CN112726254A CN 112726254 A CN112726254 A CN 112726254A CN 202011640961 A CN202011640961 A CN 202011640961A CN 112726254 A CN112726254 A CN 112726254A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention relates to a method for preparing true-color biomechanical pulp by treating wheat straw with hot water and alkaline bio-enzyme and fully utilizing byproducts, and provides a method for preparing high-strength true-color biomechanical pulp by treating wheat straw with hot water and alkaline bio-enzyme for the first time, so that the requirements of producing true-color wrapping paper and paper base materials are met, the byproducts are recycled to prepare a biomass compound fertilizer, solid waste discharge is not needed, and high-valued full utilization of wheat straw is realized. The preparation method is simple, green, clean and efficient, and has good practical application value and wide application prospect.
Description
Technical Field
The disclosure belongs to the field of papermaking technology and new materials, and particularly relates to a method for fully utilizing bio-mechanical pulp and byproducts through hot water treatment and bio-enzyme treatment.
Background
The paper industry is not only a consumer product industry, but also an important basic raw material industry, and relates to a plurality of fields such as life, culture and education, industry and agriculture, national defense, aviation and the like. In 2016, the import of the paper pulp reaches 2106 ten thousand tons and the import of the waste paper reaches 2850 ten thousand tons, the import dependence degree of the pulping and papermaking fiber raw materials in China is close to 50 percent, and the import of the foreign waste paper makes up the gap of the fiber raw materials in China and supports the development of the papermaking industry in China. China faces the problem of serious shortage of papermaking raw materials. Therefore, the project group develops a new technology for preparing the bio-mechanical pulp by utilizing the agricultural straws to replace waste paper raw materials, and provides an important way for solving the shortage of papermaking raw materials and the high-value utilization of the agricultural straws.
In the traditional pulping and papermaking, wheat straw is taken as a representative of grass and is an important papermaking raw material, but because wheat straw leaves, wheat straw sheaths and the like are not easy to pulp, the wheat straw is usually only retained in the material preparation process, the wheat straw leaves and the wheat straw sheaths are required to be removed as far as possible, but the removal of the wheat straw leaves, the wheat straw sheaths and the like not only causes the increase of the material preparation cost, but also greatly reduces the utilization rate of the wheat straw raw material. Therefore, the project develops a clean and efficient pulping process taking whole wheat straws as raw materials, develops a high-valued utilization technology for preparing biomass fertilizer by byproducts in the pulping process, and opens up an important way for comprehensive high-valued utilization of agricultural straws.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for preparing true-color biomechanical pulp by treating wheat straw with hot water and alkaline biological enzyme and fully utilizing byproducts. The preparation method is simple, green, clean and efficient, and has good practical application value and wide application prospect.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect of the invention, a method for preparing unbleached biomechanical pulp by using hot water treatment and bio-enzyme treatment of wheat straw and fully utilizing byproducts is provided, which comprises the following steps:
carrying out hot water treatment on wheat straws, extruding and dividing the wheat straws into filaments, and collecting wastewater of an extruding and dividing section;
carrying out enzymolysis on the extruded and devillicated wheat straw pulp by adopting alkaline biological enzyme, and collecting wastewater generated in an enzyme treatment stage;
grinding the wheat straw pulp subjected to enzymolysis to obtain bio-mechanical pulp, and collecting grinding washing water;
mixing the extrusion shredding section wastewater, the wastewater generated in the enzyme treatment stage and the pulping washing water, evaporating and concentrating, and recovering heat energy for hot water pretreatment; recovering solid residue, regulating pH with phosphoric acid, and granulating to obtain the final product.
In the traditional papermaking process, wheat straw is taken as a representative of grass and is an important papermaking raw material, but because wheat straw leaves, wheat straw sheaths and the like are not easy to pulp, the wheat straw is usually only retained in the material preparation process, the wheat straw leaves and the wheat straw sheath are required to be removed as far as possible, but the removal of the wheat straw leaves, the wheat straw sheaths and the like not only increases the cost of the material preparation, but also greatly reduces the utilization rate of the wheat straw raw material. According to research, the raw material structures, chemical compositions, fiber forms and contents of different wheat straw parts are different, the ash content, alkali extract and pentosan content of wheat leaves and leaf sheaths are higher than those of the straw parts, and the cellulose content is slightly lower than that of the straw parts; in terms of chemical structure, the fiber of the straw part is longer, the stem base part is longer than the middle part of the stem, and the fiber cells of the wheat leaves and the leaf sheath are shorter and thicker than the straw part. The invention adopts the method of combining alkalescent hot water and biological enzyme to prepare the excellent performance of the biological mechanical pulp, and simultaneously, the byproduct can prepare the easily degradable biomass compound fertilizer.
In a second aspect of the invention, there is provided a bio-mechanical pulp and a biomass compound fertilizer prepared by any one of the methods.
In a third aspect of the invention, there is provided the use of the above-described bio-mechanical pulp in the fields of living, culture and education, industrial and agricultural, national defense and aviation.
The invention has the beneficial effects that:
(1) taking waste wheat straw after wheat grains are obtained as a raw material, carrying out hot water treatment on the wheat straw according to a liquid ratio of 1:4-1:8, simultaneously adding a small amount of KOH, adjusting the pH value of the hot water to 10-14, and controlling the treatment temperature to 80-100 ℃ for 15-60 min; extruding and splitting the wheat straw after the hot water treatment is finished; reacting the divided wheat straw with an alkaline biological complex enzyme at 40-60 ℃ for 30-90 min; grinding the biologically treated wheat straw into pulp to prepare the bio-mechanical pulp, and applying the bio-mechanical pulp to the preparation of non-surface paper of corrugated paper or boxboard paper. The jordaning washing water is treated by a multi-effect evaporator, and the heat energy is recovered and used in the hot water pretreatment section of the step S1; and regulating the pH value of the recovered solid residues by using trace phosphoric acid, and then granulating to prepare the biomass compound fertilizer.
(2) The wheat straw bio-mechanical pulp is subjected to defibering, papermaking and forming to obtain the non-surface layer of the corrugated raw paper and/or the cardboard paper. And recovering waste water of an extrusion and devillicating section, biologically treated waste water and pulping washing water in the pulping process, and preparing the biomass compound fertilizer by adopting a multi-effect evaporator for evaporation concentration, pH value adjustment, granulation and the like.
(3) The method takes the whole wheat straw as the raw material, only adopts hot water, trace KOH and alkaline biological enzyme by reasonably optimizing the preparation process and steps in the whole preparation process of the bio-mechanical pulp, the pH value of the bio-mechanical pulp is alkalescent when the pulp grinding is finished, the yield of the obtained bio-mechanical pulp is higher (65-85%), the method that the wheat straw is normally used for pulping in the past is broken, the utilization rate of the wheat straw is greatly improved, compared with the traditional mechanical pulp, the energy consumption of the pulp grinding can be saved by more than 40%, and various physical indexes meet the requirements of producing packaging paper and paper base materials.
(4) In the invention, the pulping washing water is treated by a multi-effect evaporator, 15-35% of solid residue is recovered, and simultaneously, the pH value of the residue is adjusted by trace phosphoric acid, and then the residue is granulated to prepare the biomass compound fertilizer, wherein the fertilizer contains a proper amount of K, P element and a large amount of straw components which are easy to degrade and have small particles, the whole production process is green and environment-friendly, and the high-valued full utilization of wheat straw is realized. The preparation method is simple, energy-saving and environment-friendly, accords with the industrial policies of national resource conservation, economic cycle, energy conservation and emission reduction, and can generate good social benefit, economic benefit and ecological benefit, thereby having good practical application value and industrial application prospect.
(5) The preparation method is simple, strong in practicability and easy to popularize.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be further understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations and/or combinations thereof.
In the invention, the liquid ratio refers to the cooking liquid ratio of the raw materials, and the liquid ratio is as follows: the ratio of the weight of the oven-dried raw material to the volume of the total cooking liquid.
A method for preparing natural-color biomechanical pulp by using hot water treatment and biological enzyme treatment of wheat straw and fully utilizing byproducts comprises the following steps:
carrying out hot water treatment on wheat straws, extruding and dividing the wheat straws into filaments, and collecting wastewater of an extruding and dividing section;
carrying out enzymolysis on the extruded and devillicated wheat straw pulp by adopting alkaline biological enzyme, and collecting wastewater generated in an enzyme treatment stage;
grinding the wheat straw pulp subjected to enzymolysis to obtain bio-mechanical pulp, and collecting grinding washing water;
mixing the extrusion shredding section wastewater, the wastewater generated in the enzyme treatment stage and the pulping washing water, evaporating and concentrating, and recovering heat energy for hot water pretreatment; recovering solid residue, regulating pH with phosphoric acid, and granulating to obtain biological compound fertilizer.
In some embodiments, the wheat straw is cut into 3-6cm pieces and then subjected to a hot water treatment.
In some embodiments, wheat straw is treated with hot water at a liquid ratio of 1:4 to 1:8, with addition of a small amount of KOH, and the pH of the hot water is adjusted to 10-14 at a temperature of 80-100 ℃ for 15-60 min.
In some embodiments, the extrusion devillicating is carried out by using a screw extruder, and the process conditions are as follows: the compression ratio of the screw extruder is controlled to be 1: 3-6.
In some embodiments, the alkaline biological complex enzyme is a compound enzyme of xylanase, cellulase and pectinase, and the total dosage is as follows: 10-80IU/mL, wherein the enzyme activity ratio of xylanase, cellulase and pectinase is 0-8: 0-3: 0 to 4; preferably, the total dosage of the enzyme is 40-60 IU/mL.
In some embodiments, the number of refining is determined according to production needs, and the beating degree of refining is controlled to be 35-45 DEG SR.
In some embodiments, the refining process is specifically: the pulping process conditions are as follows: and (3) carrying out high-concentration pulping by using a KPF series high-concentration disc grinder, wherein the rotating speed of a main shaft is 3000-4000 r/min, one-stage or two-stage pulping is adopted, and the pulping clearance is 0.15-0.5 mm.
In some embodiments, the mass ratio of the extrusion filament-separating section wastewater to the enzyme treatment wastewater to the grinding washing water is 1-5: 20-30: 10-20, and the wastewater from different sources is matched, so that not only can centralized treatment be realized, but also the synergistic effect can be realized by utilizing different components of the wastewater, and the fertilizer efficiency of the biomass composite fertilizer is improved.
The invention is further illustrated by the following examples, which are not to be construed as limiting the invention thereto. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The test methods in the following examples, which are not specified under specific conditions, are generally carried out under conventional conditions. The alkaline biological enzyme used in the invention is from Shandong Kete enzyme preparation Co., Ltd, and Novexin biological enzyme preparation China Co.
Example 1
A process for producing bio-mechanical pulp by using wheat straw hot water in cooperation with bio-enzyme treatment, which is described in this example, produces bio-mechanical pulp and tests the pulp properties.
(1) Cutting the physically selected and dedusted air-dried wheat straw into 5 cm-long standby raw materials, placing into a normal-temperature reaction kettle, and performing hot water treatment on the wheat straw according to a liquid ratio of 1:5(g/mL), wherein the temperature is 87 ℃, and the treatment time is controlled at 17 min.
(2) Adding a trace amount of KOH into a mixture of hot water and wheat straw in a reaction kettle, adjusting the pH value of the hot water to be 14, dissolving out a small part of substances such as hemicellulose, lignin, pectin and the like from the wheat straw, and reaching the pH value of the wheat straw water content to 9 when the wheat straw is saturated with water and softened.
(3) The water-saturated softened wheat straw is extruded on a screw extruder, and the pressure of the extruder is adjusted to ensure that the wheat straw achieves uniform and good yarn dividing effect. Performing primary extrusion on the wheat straw with good saturated softening and splitting performance, controlling the compression ratio of a screw extruder to be 1:3, and collecting waste water of an extrusion splitting section;
(4) treating the softened and devillicated wheat straw and alkaline biological enzyme in a bioreactor for 53min, controlling the temperature at 55 ℃ and the liquid ratio at 1:4(g/mL), continuously stirring and mixing the wheat straw to enable the wheat straw and the biological enzyme to fully act, further softening wheat straw fibers, and collecting wastewater generated in an enzyme treatment stage;
the alkaline biological compound enzyme is a compound enzyme of xylanase, cellulase and pectinase, the total dosage is 60IU/mL (60 IU biological enzyme is adopted in 1mL feed liquid), and the enzyme activity ratio of the xylanase, the cellulase and the pectinase is 3: 2.4: 1.
(5) the bio-treated wheat straw is ground into pulp by a pulping machine for two sections, so that the pulp beating degree reaches 40 DEG SR.
The technological parameters of the pulp grinding are as follows: carrying out high-concentration pulp grinding by using a KPF high-concentration disc grinder, wherein the rotating speed of a main shaft is 3000r/min, the pulp grinding gap is 0.2mm, and collecting pulp grinding washing water;
(6) defibering the grinded wheat straw bio-mechanical pulp by a defibering device to uniformly mix the wheat straw bio-mechanical pulp, and then making and forming 70g/m on a paper former2Natural color corrugatedPaper. Then, the physical strength was measured. All physical indexes meet the requirements of producing natural-color wrapping paper and paper-based materials.
(7) Mixing the extrusion shredding section wastewater, the wastewater generated in the enzyme treatment stage and the pulping washing water according to the mass ratio of 2:20:12, then carrying out evaporation concentration, carrying out evaporation concentration by adopting a multi-effect evaporator to obtain residue, and recovering heat energy for the hot water steam pretreatment section in the step (1); and adding phosphoric acid into the residues to adjust the pH value to 6, drying, crushing and granulating to prepare the biomass organic fertilizer.
Example 2
In the example of the process for preparing the bio-mechanical pulp by combining wheat straw with hot water and bio-enzyme treatment, the bio-mechanical pulp is prepared to prepare the natural-color corrugated paper, and the pulp forming performance of the natural-color corrugated paper is tested.
(1) Cutting the physically selected and dedusted air-dried wheat straw into 5 cm-long standby raw materials, putting the raw materials into a normal-temperature reaction kettle, and carrying out hot water treatment on the wheat straw according to a liquid ratio of 1:4(g/mL), wherein the temperature is 100 ℃, and the treatment time is controlled to be 30 min.
(2) Adding a trace amount of alkali KOH into a mixture of hot water and wheat straw in a reaction kettle, adjusting the pH value of the hot water to be 13, dissolving out a small part of substances such as hemicellulose, lignin, pectin and the like from the wheat straw, and enabling the pH value of the wheat straw containing water to reach 8 when the wheat straw is saturated with water and softened.
(3) The water-saturated softened wheat straw is extruded on a screw extruder, and the pressure of the extruder is adjusted to ensure that the wheat straw achieves uniform and good yarn dividing effect. The saturated softening and devillicating of the wheat straw are better, and the extrusion is carried out for one time; the compression ratio of the screw extruder is controlled to be 1:4, and the waste water of the extrusion filament dividing section is collected;
(4) treating the softened and devillicated wheat straw and alkaline biological enzyme in a bioreactor for 42min, controlling the temperature at 58 +/-2 ℃ and the liquid ratio at 1:5(g/mL), continuously stirring and mixing the wheat straw to enable the wheat straw and the biological enzyme to fully act, further softening wheat straw fibers, and collecting wastewater generated in an enzyme treatment stage;
the alkaline biological compound enzyme is a compound enzyme of xylanase, cellulase and pectinase, the total dosage is 60IU/mL, and the enzyme activity ratio of the xylanase, the cellulase and the pectinase is 5: 4: 1.5.
(5) the bio-treated wheat straw is ground into pulp by a pulping machine for two sections, so that the pulp beating degree reaches 42 DEG SR.
The technological parameters of the pulp grinding are as follows: using KPF high-concentration disc mill to carry out high-concentration pulp grinding with main shaft rotation speed of 3000r/min and pulp grinding gap of 0.25mm, collecting pulp grinding washing water
(6) Defibering the grinded wheat straw bio-mechanical pulp by a defibering device to uniformly mix the wheat straw bio-mechanical pulp, and then making and forming 80g/m on a paper former2The natural-color corrugated paper. Then, the physical strength was measured. Various physical indexes meet the requirements of producing natural-color packing paper and paper base materials.
(7) Mixing the extrusion shredding section wastewater, the wastewater generated in the enzyme treatment stage and the pulping washing water according to the mass ratio of 10:15:12, then carrying out evaporation concentration, carrying out evaporation concentration by adopting a multi-effect evaporator to obtain residue, and recovering heat energy for the hot water steam pretreatment section in the step (1); and adding phosphoric acid into the residues to adjust the pH value to 6, drying, crushing and granulating to prepare the biomass organic fertilizer.
Example 3
A process for preparing the bio-mechanical pulp from wheat straw by hot water and biological enzyme treatment includes such steps as preparing the natural-color corrugated paper, and testing its pulp performance.
(1) Cutting the physically selected and dedusted air-dried wheat straw into 5 cm-long standby raw materials, putting the raw materials into a normal-temperature processor or a reaction kettle, and carrying out hot water treatment on the wheat straw according to a liquid ratio of 1:6(g/mL), wherein the temperature is 105 ℃, and the treatment time is controlled to be 25 min.
(2) Adding a trace amount of KOH into a mixture of hot water and wheat straw in a reaction kettle, adjusting the pH value of the hot water to be 13, dissolving out a small part of substances such as hemicellulose, lignin, pectin and the like from the wheat straw, and when the wheat straw is saturated with water and softened, reaching 8 when the treatment is finished.
(3) The water-saturated softened wheat straw is extruded on a screw extruder, and the pressure of the extruder is adjusted to ensure that the wheat straw achieves uniform and good yarn dividing effect. The saturated softening and devillicating of the wheat straw are better, and the extrusion is carried out for one time; controlling the compression ratio of the screw extruder at 1:5, and collecting waste water of the extrusion filament dividing section;
(4) treating the softened and devillicated wheat straw and alkaline biological enzyme in a bioreactor for 64min, controlling the temperature at 52 ℃ and the liquid ratio at 1:4(g/mL), continuously stirring and mixing the wheat straw to enable the wheat straw and the biological enzyme to fully act, further softening wheat straw fibers, and collecting wastewater generated in an enzyme treatment stage;
the alkaline biological compound enzyme is a compound enzyme of xylanase, cellulase and pectinase, the total dosage is 40IU/mL, and the enzyme activity ratio of the xylanase, the cellulase and the pectinase is 6: 4: 1.5.
(5) and (3) pulping the biologically treated wheat straws by using a pulping machine to ensure that the pulp beating degree reaches 41 DEG SR.
The technological parameters of the pulp grinding are as follows: carrying out high-concentration grinding by using a KPF high-concentration disc grinder, wherein the rotating speed of a main shaft is 3000r/min, one-section grinding is adopted, the grinding gap is 0.15mm, and grinding washing water is collected;
(6) defibering the grinded wheat straw bio-mechanical pulp by a defibering device to uniformly mix the wheat straw bio-mechanical pulp, and then making and forming the wheat straw bio-mechanical pulp on a paper forming device to form 50g/m2The natural-color corrugated paper. Then, the physical strength was measured. Various physical indexes meet the requirements of producing natural-color packing paper and paper base materials.
(7) Mixing the extrusion shredding section wastewater, the wastewater generated in the enzyme treatment stage and the pulping washing water according to the mass ratio of 8:20:12, then carrying out evaporation concentration, carrying out evaporation concentration by adopting a multi-effect evaporator to obtain residue, and recovering heat energy for the hot water steam pretreatment section in the step (1); and adding phosphoric acid into the residues to adjust the pH value to 6, drying, crushing and granulating to prepare the biomass organic fertilizer.
Comparative example 1
The difference from the example 1 is that the waste water of the extrusion and shredding stage is not added, and the waste water generated in the enzyme treatment stage and the grinding washing water are mixed according to the ratio of 11: 6.
Comparative example 2
The difference from the example 1 is that no pulping washing water is added, and the ratio of the extrusion filament separating section waste water, the waste water generated in the enzyme treatment stage and the pulping washing water is 4: 13.
And (3) performance testing:
the performance of the natural-color bio-mechanical pulp and the biomass organic fertilizer prepared by the embodiment of the invention and the comparative example is tested, wherein each test method is a general method in the field.
TABLE 1 comparison list of physical performance indexes of pulp prepared by hot water treatment and bio-enzyme treatment of wheat straw to prepare natural-color bio-mechanical pulp and by-product full utilization method
2. Fertilizer efficiency detection of biomass compound fertilizer prepared in examples 1-3 and comparative examples 1 and 2
(1) Corn pot test
The bio-organic fertilizer prepared in the examples 1-3 and the comparative examples 1 and 2 is applied to potted corn for testing, and a biomass compound fertilizer (3g/kg soil) is applied to the seedling stage of the corn, and the results are shown in the table 2, which shows that the biomass of the corn is remarkably increased by the examples 1-3 and the comparative examples 1 and 2 compared with the CK which is not applied with fertilizer, wherein the effect is the best by the example 2.
TABLE 2
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or some of them can be substituted. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the present invention has been described with reference to the specific embodiments, it should be understood that the scope of the present invention is not limited thereto, and those skilled in the art will appreciate that various modifications and variations can be made without inventive changes based on the technical solutions of the present invention.
Claims (10)
1. A method for preparing natural-color biomechanical pulp by using wheat straw through hot water treatment and biological enzyme treatment and fully utilizing byproducts is characterized by comprising the following steps:
carrying out hot water treatment on wheat straws, extruding and dividing the wheat straws into filaments, and collecting wastewater of an extruding and dividing section;
carrying out enzymolysis on the extruded and devillicated wheat straw pulp by using alkaline biological enzyme, and collecting wastewater generated in an enzyme treatment stage;
grinding the wheat straw pulp subjected to enzymolysis to obtain bio-mechanical pulp, and collecting grinding washing water;
mixing the waste water of the thread rolling section, the waste water generated in the enzyme treatment stage and the pulping and washing water, evaporating and concentrating, and recovering heat energy for hot water pretreatment; and recovering solid residues, adjusting the pH value with phosphoric acid, and granulating to prepare the biomass compound fertilizer.
2. The method of claim 1, wherein the wheat straw is cut into 3-6cm pieces and then treated with hot water.
3. The method for preparing true-color biomechanical pulp and utilizing byproducts of wheat straw through hot water and alkaline bio-enzyme treatment according to claim 1, wherein the wheat straw is subjected to hot water treatment according to a liquid ratio of 1:4-1:8, trace alkali is added, the pH value of hot water is adjusted to 10-14, the treatment temperature is 80-100 ℃, and the treatment time is 15-60 min.
4. The method for preparing true-color biomechanical slurry and fully utilizing byproducts from wheat straw treated by hot water in cooperation with alkaline bio-enzyme according to claim 1, wherein a screw extruder is adopted for extruding and splitting, and the process conditions are as follows: the compression ratio of the screw extruder was controlled to be 1: 3-6.
5. The method for preparing true-color biomechanical slurry and fully utilizing byproducts from wheat straw treated by hot water in cooperation with alkaline bio-enzyme according to claim 1, wherein the alkaline bio-complex enzyme is a complex enzyme of xylanase, cellulase and pectinase, and the total dosage is as follows: 10-80IU/mL, wherein the enzyme activity ratio of xylanase, cellulase and pectinase is 0-8: 0-3: 0 to 4; preferably, the total dosage of the enzyme is 40-60 IU/mL.
6. The method for preparing true-color biomechanical pulp and full utilization of byproducts from wheat straw treated with hot water in cooperation with alkaline bio-enzyme according to claim 1, wherein the number of jordaning is determined according to production requirements, and the jordaning degree is controlled to be 35-45 ° SR.
7. The method for preparing true-color biomechanical pulp and fully utilizing byproducts from wheat straw treated by hot water in cooperation with alkaline bio-enzyme according to claim 1, wherein the refining process specifically comprises the following steps: the pulping process conditions are as follows: and (3) carrying out high-concentration pulping by using a KPF series high-concentration disc grinder, wherein the rotating speed of a main shaft is 3000-4000 r/min, one-stage or two-stage pulping is adopted, and the pulping clearance is 0.15-0.5 mm.
8. The method for preparing true-color biomechanical pulp from wheat straw treated by hot water and alkaline bio-enzyme and fully utilizing byproducts as claimed in claim 1, wherein the mass ratio of the extrusion branch section wastewater, the wastewater generated in the enzyme treatment stage and the grinding washing water is 1-5: 20-30: 10-20.
9. The biomechanical slurry produced according to the method of any of claims 1-8.
10. Use of the biomechanical pulp of claim 9 in the fields of life, culture and education, agriculture and industry, defense and aviation.
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| CN109577060A (en) * | 2018-12-29 | 2019-04-05 | 齐鲁工业大学 | A kind of method that hot water cooperates with alkaline cellulase treatment wheat straw preparation true qualities biological mechanical pulp |
| CN109629296A (en) * | 2018-12-29 | 2019-04-16 | 齐鲁工业大学 | A kind of biological mechanical pulp preparation method of hot water treatment collaboration cellulase treatment |
| WO2020133857A1 (en) * | 2018-12-29 | 2020-07-02 | 齐鲁工业大学 | Method for preparing biomechanical unbleached pulp from grass straw |
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