CN112853791A - Method for preparing bio-mechanical pulp and biomass compound fertilizer from wheat straw leaves - Google Patents
Method for preparing bio-mechanical pulp and biomass compound fertilizer from wheat straw leaves Download PDFInfo
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- CN112853791A CN112853791A CN202011636878.6A CN202011636878A CN112853791A CN 112853791 A CN112853791 A CN 112853791A CN 202011636878 A CN202011636878 A CN 202011636878A CN 112853791 A CN112853791 A CN 112853791A
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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
- D21C1/00—Pretreatment of the finely-divided materials before digesting
- D21C1/02—Pretreatment of the finely-divided materials before digesting with water or steam
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B17/00—Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/12—Granules or flakes
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
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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
- D21C1/00—Pretreatment of the finely-divided materials before digesting
- D21C1/06—Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
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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
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/0021—Introduction of various effluents, e.g. waste waters, into the pulping, recovery and regeneration cycle (closed-cycle)
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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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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
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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
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- Mechanical Engineering (AREA)
- Pest Control & Pesticides (AREA)
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Abstract
The invention provides a method for preparing bio-mechanical pulp and biomass compound fertilizer from wheat straw, comprising the steps of S1, adding water into pretreated wheat straw cut sections for hot water treatment, and adjusting the solution to be alkaline by using KOH; s2 performing thread rolling treatment on the wheat straw leaves treated in S1; s3, adding alkaline biological enzyme into the wheat straw leaves treated in S2 for enzymolysis; s4, grinding the wheat straw leaves subjected to the enzymolysis treatment of S3 to prepare bio-mechanical pulp; s5, concentrating and evaporating the waste water generated by hot water discharge, the waste water generated by thread rolling treatment, the waste water generated by enzymolysis treatment and the waste water generated by grinding treatment to obtain residues, adjusting the pH of the residues by adopting phosphoric acid, and preparing the biomass compound fertilizer by adopting the residues after the pH adjustment. The invention can meet the requirements of producing primary color packaging paper and paper base materials, and can also recover the byproducts thereof to prepare the biomass compound fertilizer, thereby greatly reducing the emission of solid waste and realizing the high-valued full utilization of wheat straw.
Description
Technical Field
The invention belongs to the technical field of paper making and fertilizer making, and relates to a method for preparing bio-mechanical pulp and a biomass compound fertilizer from wheat straw leaves.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
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 paper pulp reaches 2106 ten thousand tons and the import of waste paper reaches 2850 ten thousand tons, the import dependence degree of pulping and papermaking fiber raw materials in China is close to 50 percent, and the import of 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 papermaking process, wheat straw is used as an important papermaking raw material, and wheat leaves in the wheat straw are usually required to be removed as much as possible in the material preparation process, because the wheat straw is not easy to pulp although the content of hemicellulose in the wheat straw is high. Specifically, because the wheat straw leaves have short fibers and high content of hybrid cells, the outer layer of the secondary wall is thick and is tightly bonded with the middle layer of the secondary wall, the wheat straw leaves are difficult to remove in the pulping process, and the fibers are difficult to absorb water, moisten and expand and fine fibers. If the fibrillation is required excessively during beating, excessive cutting of the fibers is inevitably caused, which not only affects the strength of the finished paper, but also makes water filtration difficult during papermaking. But the removal of wheat straw leaves not only increases the cost of material preparation, but also greatly reduces the utilization rate of wheat straw raw materials. Therefore, CN 109629318A discloses a method for preparing bio-mechanical pulp from wheat straw leaves, which uses wheat straw leaves as raw materials and adopts a hot water and alkaline composite bio-enzyme process to prepare high-yield primary-color bio-mechanical pulp. However, the inventor finds that the byproducts generated by the method are difficult to realize high-efficiency utilization and are not beneficial to comprehensive high-value utilization of agricultural straws through research.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for preparing bio-mechanical pulp and a biomass compound fertilizer from wheat straw leaves, and provides a method for preparing high-strength natural color bio-mechanical pulp by using the wheat straw leaves as a raw material and treating whole wheat straw leaves by hot water in cooperation with alkaline biological enzyme, so that the requirements of producing primary color packaging paper and paper base materials are met, the biomass compound fertilizer is prepared by recycling byproducts of the raw material, the emission of solid waste is greatly reduced, and the high-valued full utilization of the wheat straw leaves is realized. 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 relates to the following technical scheme:
in a first aspect of the invention, a method for preparing bio-mechanical pulp and biomass compound fertilizer from wheat straw leaves is provided, which comprises the following steps:
s1, adding water into the pre-treated wheat straw cut sections for hot water treatment, and adjusting the solution to be alkaline by using KOH in the hot water treatment process;
s2, performing thread rolling treatment on the wheat straw leaves processed in the step S1;
s3, adding alkaline biological enzyme into the wheat straw leaves processed in the step S2 for enzymolysis;
s4, grinding the wheat straw subjected to enzymolysis treatment in the step S3 to prepare bio-mechanical pulp;
s5, concentrating and evaporating the waste water generated by hot water discharge, the waste water generated by thread rolling treatment, the waste water generated by enzymolysis treatment and the waste water generated by grinding treatment to obtain residues, adjusting the pH of the residues by adopting phosphoric acid, and preparing the biomass compound fertilizer by adopting the residues after the pH adjustment.
According to the invention, through the research on the original method, the storage stability of the biomass compound fertilizer prepared by adopting the waste water generated by the original method is relatively poor, and for the reason, the physical state of the raw materials subjected to enzymolysis treatment is changed by adopting a hot water combined thread rolling treatment method, and the generated waste water is matched after the enzymolysis treatment and the grinding treatment, so that the composition of solid substances in the waste water is changed, and when the solid substances are adopted for preparing the fertilizer, the anti-caking performance is better, so that the storage stability of the biomass compound fertilizer is improved.
In a second aspect of the invention, the bio-mechanical pulp and/or the biomass compound fertilizer prepared by the method is provided.
In a third aspect of the invention, there is provided the use of the above mentioned bio-mechanical pulp for the production of primary coloured packaging papers and paper based materials and/or the use of a biomass compound fertilizer for the promotion of crop growth.
The invention has the beneficial effects that: according to the invention, the whole wheat straw is used as the raw material, in the whole preparation process of the bio-mechanical pulp, only hot water, KOH and alkaline bio-enzyme are adopted through reasonably optimizing the preparation process and steps, 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 (60-85%), the method that wheat straw is usually used for pulping in the past is broken through, the utilization rate of 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.
According to the invention, the pulping washing water is subjected to concentration and evaporation treatment, 15-35% of solid residues are recovered, the pH value of the solid residues is adjusted by using phosphoric acid, and then the solid residues are granulated to prepare the biomass compound fertilizer, wherein the fertilizer contains a proper amount of N, 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 high-valued full utilization of wheat straw is realized. It should be noted that, unlike the traditional preparation of fertilizer based on chemical pulp (chemical pulp requires high temperature and high alkali, generally the temperature is above 160 ℃, and about 20% of alkali consumption) by-product, the invention adopts low temperature and less alkali mode, and the wheat straw leaves used in the invention are good materials of natural potash fertilizer, so the invention has natural advantages in fertilizer preparation, and meanwhile, the biomass compound fertilizer prepared by the invention has the advantages of high fertilizer efficiency, good storage stability and the like by optimizing the screening process conditions.
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.
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, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As mentioned above, in the conventional paper making process, wheat straw has been used as an important paper making raw material, and wheat straw is often removed as much as possible in the preparation process because wheat straw is not easy to pulp despite its high hemicellulose content.
In one embodiment, the present invention provides a method for preparing bio-mechanical pulp and biomass compound fertilizer from wheat straw leaves, comprising:
s1, adding water into the pre-treated wheat straw cut sections for hot water treatment, and adjusting the solution to be alkaline by using KOH in the hot water treatment process;
s2, performing thread rolling treatment on the wheat straw leaves processed in the step S1;
s3, adding alkaline biological enzyme into the wheat straw leaves processed in the step S2 for enzymolysis;
s4, grinding the wheat straw subjected to enzymolysis treatment in the step S3 to prepare bio-mechanical pulp;
s5, concentrating and evaporating the waste water generated by hot water discharge, the waste water generated by thread rolling treatment, the waste water generated by enzymolysis treatment and the waste water generated by grinding treatment to obtain residues, adjusting the pH of the residues by adopting phosphoric acid, and preparing the biomass compound fertilizer by adopting the residues after the pH adjustment.
In some embodiments of the present invention, in step S1, the pretreatment mode is physical screening and dust removal; cutting the wheat grass leaves into 3-8cm small sections; the liquid ratio is controlled to be 1kg: 4-8L; controlling the temperature to be 80-100 ℃, and controlling the treatment time to be 15-60 min; the wheat straw leaves are cut into segments, and are cooked for a period of time in advance by controlling the liquid ratio, the cooking temperature and the time, so that the wheat straw leaves can be favorably softened by water.
In some embodiments of the present invention, in step S1, the pH of the hot water is adjusted to 10 to 14; dissolving out a small part of hemicellulose, lignin, pectin and other substances from wheat straw leaves, and enabling the pH value of the wheat straw leaves to reach 7-9 when the wheat straw leaves are softened by hot water saturation and at the same time when the treatment is finished.
In some embodiments of the present invention, in step S2, the thread rolling compression ratio is controlled to be 1: 1-4, so that the wheat straw leaves achieve uniform and good filament separating effect; the subsequent enzymolysis and pulping treatment are facilitated, and the energy consumption is reduced; in the first two steps of the invention, hot water combined thread rolling treatment is used, the damage to wheat straw fiber is small, the specific surface area of the raw material is increased, and in the subsequent enzymolysis treatment process, biological enzyme can more easily enter the inner part and intercellular layer of the cell wall to act on chemical connection among lignin, cellulose and hemicellulose and undissolved macromolecular substances such as pectin, thereby further promoting the enzymatic pulping action.
In some embodiments of the present invention, in step S3, the enzymolysis condition specifically includes: controlling the temperature to be 40-60 ℃, wherein the alkaline biological 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 the xylanase, the cellulase and the pectinase is (0-4): (0-3): (0-1.5), the addition amount of each enzyme is not 0; controlling the liquid ratio at 1kg: 3-8L; the enzymolysis treatment time is 30-90 min; the synergistic effect of the biological enzymes can improve the fiber characteristics of the pulp and the pulping energy consumption. Preferably, the enzyme activity ratio of the xylanase, the cellulase and the pectinase is (2.5-3.5): (1.5-2.5): 1; preferably, the total amount of enzyme is 30-40 IU/mL. Through further research, the enzyme activity proportion of the biological compound enzyme is optimized, the high performance of the formed pulp is ensured, and the fertilizer efficiency and the storage stability of the fertilizer can be further improved through the matching with the subsequent addition amount of each wastewater.
Meanwhile, carrying out interval type stirring treatment; thereby leading the wheat grass leaves to fully act with the biological enzyme for further softening the wheat grass leaf fiber raw material.
In some embodiments of the present invention, in step S4, the refining process specifically includes: 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, one-stage or two-stage pulp grinding is adopted, and the pulp grinding gap is 0.15-0.5 mm; the heat and high temperature generated in the pulping process are utilized to inactivate the biological enzyme so as to prevent the subsequent strength of the paper pulp from being influenced.
In some embodiments of the present invention, in step S5, a multi-effect evaporator is used for concentration and evaporation; the heat energy is recovered for the hot water process of step S1.
In some embodiments of the invention, in the step S5, the mass ratio of the wastewater generated by the hot water outlet, the wastewater generated by the thread rolling treatment, the wastewater generated by the enzymolysis treatment and the wastewater generated by the grinding treatment is 2-5: 2-4: 1-5: 5-20.
In some embodiments of the present invention, in step S5, phosphoric acid is used to adjust the pH of the residue to 7, and the residue is dried, pulverized, and granulated.
In another embodiment of the invention, the bio-mechanical pulp and/or the biomass compound fertilizer prepared by the method is provided.
In a further embodiment of the invention, there is provided the use of the above mentioned bio-mechanical pulp for the production of primary coloured packaging papers and paper based materials and/or the use of biomass compound fertilizers for promoting crop growth.
The natural-color biomechanical pulp can be widely applied to the production of primary-color packaging paper and paper-based materials. And (3) defibering and pulping the natural-color bio-mechanical pulp to form the non-surface layer of the corrugated raw paper and/or the cardboard paper. The burst index, the tearing index and the ring pressure index are all higher. Meanwhile, the fertilizer prepared by the invention is a biomass compound fertilizer, and tests prove that the fertilizer has better fertilizer efficiency and storage stability.
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 biological enzyme used in the invention is from Shandong Longkote enzyme preparation Co., Ltd, and Novexin biological enzyme preparation China Co.
Example 1
A method for preparing bio-mechanical pulp and biomass compound fertilizer from wheat straw leaves comprises the following steps:
(1) cutting the physically selected and dedusted wheat straw into 4cm small sections of raw materials, putting the raw materials into a normal-temperature processor or a reaction kettle, and performing the following steps of 1:4, carrying out hot water treatment on the wheat grass leaves at the temperature of 100 ℃ for 30 min. Adding a trace amount of KOH into a mixture of hot water and wheat straw leaves in a reaction kettle or a processor, 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 8 when the wheat straw leaves are saturated with water and softened.
(2) Putting the wheat straw in the step (1) on a TSP360 thread rolling machine for thread rolling, and adjusting the pressure of the thread rolling machine to enable the wheat straw to achieve a uniform and good thread dividing effect;
the thread rolling process conditions are as follows: pressure during thread rolling 1: 3.
(3) treating the softened and devillicated wheat straw leaves and alkaline biological enzyme in a biological processor or a biological reactor for 60min at 55 ℃ and a liquid ratio of 1kg to 5L, and continuously stirring and mixing the wheat straw leaves to ensure that the wheat straw leaves and the biological enzyme fully act to further soften fibers of the wheat straw leaves. The alkaline biological enzyme is a compound enzyme of xylanase, cellulase and pectinase, and the total dosage is as follows: 40IU/mL, and the enzyme activity ratio of the xylanase, the cellulase and the pectinase is 3:2: 1.
(4) and (3) pulping the biologically treated wheat straw leaves by using a pulping machine to ensure that the pulp beating degree reaches 40 DEG SR.
(5) Defibering the grinded wheat grass leaf biomechanical pulp by a defibering device to be uniformly mixed, and then making and forming 60g/m on a paper former2The primary-color corrugated base paper. Then, the physical strength was measured. All physical indexes meet the requirements of producing primary-color corrugated base paper packing paper.
(6) Carrying out evaporation concentration on waste water generated by hot water discharge, waste water generated by thread rolling treatment, waste water generated by enzymolysis treatment and waste water generated by grinding treatment by adopting a multi-effect evaporator according to the mass ratio of 5:4:5:15 to obtain residues, and recovering heat energy for heating the hot water of the hot water treatment in the step (1); and (3) adjusting the pH value of the residue to 6 by adopting phosphoric acid, drying, crushing and granulating to prepare the biomass organic fertilizer.
Example 2
A method for preparing bio-mechanical pulp and biomass compound fertilizer from wheat straw leaves comprises the following steps:
(1) cutting the physically selected and dedusted wheat straw into 3cm small segments, placing into a normal temperature processor or a reaction kettle, and performing hot water treatment on the wheat straw according to a liquid ratio of 1:5 at 100 ℃ for 40 min. Adding a trace amount of KOH into a mixture of hot water and wheat straw leaves in a reaction kettle or a processor, 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 reaching 8 when the wheat straw leaves are saturated with water and softened.
(2) Putting the wheat straw in the step (1) on a TSP360 thread rolling machine for thread rolling, and adjusting the pressure of the thread rolling machine to enable the wheat straw to achieve a uniform and good thread dividing effect;
the thread rolling process conditions are as follows: pressure during thread rolling 1: 3.
(3) treating the softened and devillicated wheat straw leaves and alkaline biological enzyme in a biological processor or a biological reactor for 50min at 50 ℃ and a liquid ratio of 1:6, and continuously stirring and mixing the wheat straw leaves to ensure that the wheat straw leaves and the biological enzyme fully act to further soften the fibers of the wheat straw leaves. The alkaline biological enzyme is a compound enzyme of xylanase, cellulase and pectinase, and the total dosage is as follows: 30IU/mL, and the enzyme activity ratio of the xylanase, the cellulase and the pectinase is 2.5: 1.6: 1.
(4) and (3) pulping the biologically treated wheat straw leaves by using a pulping machine to ensure that the pulp beating degree reaches 38 DEG SR.
(5) Defibering the grinded wheat grass leaf biomechanical pulp by a defibering device to be uniformly mixed, and then making and forming 70g/m on a paper former2The primary-color corrugated base paper. Then, the physical strength was measured. All physical indexes meet the requirements of producing primary-color corrugated base paper packing paper.
(6) Carrying out evaporation concentration on waste water generated by hot water discharge, waste water generated by thread rolling treatment, waste water generated by enzymolysis treatment and waste water generated by grinding treatment by adopting a multi-effect evaporator according to the mass ratio of 5:2:5:20 to obtain residues, and recovering heat energy for heating the hot water of the hot water treatment in the step (1); and (3) adjusting the pH value of the residue to 6 by adopting phosphoric acid, drying, crushing and granulating to prepare the biomass organic fertilizer.
Example 3
A method for preparing bio-mechanical pulp and biomass compound fertilizer from wheat straw leaves comprises the following steps:
(1) cutting the physically selected and dedusted wheat straw into 5cm small segments, placing into a normal temperature processor or a reaction kettle, and performing hot water treatment on the wheat straw according to a liquid ratio of 1:4 at 95 ℃ for 60 min. Adding a trace amount of KOH into a mixture of hot water and wheat straw leaves in a reaction kettle or a processor, 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 8 when the wheat straw leaves are saturated with water and softened.
(2) Putting the wheat straw in the step (1) on a TSP360 thread rolling machine for thread rolling, and adjusting the pressure of the thread rolling machine to enable the wheat straw to achieve a uniform and good thread dividing effect;
the thread rolling process conditions are as follows: pressure during thread rolling 1: 3.
(3) treating the softened and devillicated wheat straw leaves and alkaline biological enzyme in a biological processor or a biological reactor for 70min, controlling the temperature at 55 ℃ and the liquid ratio at 1:5, and continuously stirring and mixing the wheat straw leaves to ensure that the wheat straw leaves and the biological enzyme fully act to further soften the fibers of the wheat straw leaves. The alkaline biological enzyme is a compound enzyme of xylanase, cellulase and pectinase, and the total dosage is as follows: 30IU/mL, and the enzyme activity ratio of the xylanase, the cellulase and the pectinase is 3.5: 2.5: 1.
(4) and (3) pulping the biologically treated wheat straw leaves by using a pulping machine to ensure that the pulp beating degree reaches 42 DEG SR.
(5) Defibering the grinded wheat grass leaf biomechanical pulp by a defibering device to be uniformly mixed, and then making and forming 60g/m on a paper former2The primary-color corrugated base paper. Then, the physical strength was measured. All physical indexes meet the requirements of producing primary-color corrugated base paper packing paper.
(6) Carrying out evaporation concentration on waste water generated by hot water discharge, waste water generated by thread rolling treatment, waste water generated by enzymolysis treatment and waste water generated by grinding treatment by adopting a multi-effect evaporator according to the mass ratio of 4:4:2:20 to obtain residues, and recovering heat energy for heating the hot water of the hot water treatment in the step (1); and (3) adjusting the pH value of the residue to 6 by adopting phosphoric acid, drying, crushing and granulating to prepare the biomass organic fertilizer.
Experimental example 1: the method is the same as the example 1, and has the difference that the step (2) is omitted, the total dosage is 50IU/mL, the enzyme activity ratio is 2: 2: 1.
experimental example 2: the method is the same as the example 1, and is characterized in that the biological enzyme after the thread rolling on the TSP360 thread rolling machine is adjusted to be the compound enzyme using three enzymes of xylanase, cellulase and pectinase, the total dosage is 50IU/mL, the enzyme activity ratio is 2: 2: 1.
experimental example 3: the method is the same as the embodiment 1, and is characterized in that the mass ratio of the waste water generated by hot water outlet, the waste water generated by thread rolling treatment, the waste water generated by enzymolysis treatment and the waste water generated by grinding treatment is controlled to be 1:4:2: 20.
Experimental example 4: the method is the same as the embodiment 1, and is characterized in that the mass ratio of the waste water generated by hot water outlet, the waste water generated by thread rolling treatment, the waste water generated by enzymolysis treatment and the waste water generated by grinding treatment is controlled to be 8:3:5: 20.
Experimental example 5: the method is the same as the embodiment 1, and is characterized in that the mass ratio of the waste water generated by hot water outlet, the waste water generated by thread rolling treatment, the waste water generated by enzymolysis treatment and the waste water generated by grinding treatment is controlled to be 4:3:2: 10.
Effect verification:
1. table 1 shows a comparison of the physical properties of the pulps prepared in example 1 and experimental examples 1 and 2, and it can be seen that the physical properties of the respective constituent pulps are better, and the requirements for producing natural-color wrapping paper and paper-based materials are met. Examples 2-5 the physical properties of the resulting slurry were the same as those of example 1.
TABLE 1 comparison summary of physical Properties of the mechanical pulp
2. Example 1 and Experimental examples 1-5 detection of fertilizer efficiency of biomass compound fertilizer
(1) Corn pot test
The bio-organic fertilizer prepared in example 1 and experimental examples 1-5 was applied to potted corn for testing, and a biomass compound fertilizer (3g/kg soil) was applied to the seedling stage of the corn, and the results are shown in table 2, which shows that the biomass of the corn is significantly increased in example 1 and experimental examples 1-5 compared with the CK control group without fertilizer, wherein the effect is best in example 1.
TABLE 2
| Biomass (g/basin) | Increase (%) | |
| CK | 6.09 | - |
| Example 1 | 8.45 | 38.8 |
| Experimental example 1 | 8.25 | 35.5 |
| Experimental example 2 | 7.63 | 25.3 |
| Experimental example 3 | 7.86 | 29.1 |
| Experimental example 4 | 7.52 | 23.5 |
| Experimental example 5 | 7.73 | 26.9 |
(2) Wheat potting test
The bio-organic fertilizer prepared in example 1 and experimental examples 1 to 5 was applied to potted wheat and applied with a biomass compound fertilizer (5g/kg soil) at the seedling stage of wheat, and the results are shown in table 3, which shows that both example 1 and experimental examples 1 to 5 increase the biomass of wheat compared with the control group CK without fertilizer application, wherein the effect is the best in example 1.
TABLE 3
| Examples of the invention | Biomass (g/basin) | Increase (%) |
| CK | 10.75 | - |
| Example 1 | 13.23 | 23.1 |
| Experimental example 1 | 13.02 | 21.1 |
| Experimental example 2 | 12.54 | 16.7 |
| Experimental example 3 | 12.73 | 18.4 |
| Experimental example 4 | 12.32 | 14.6 |
| Experimental example 5 | 12.62 | 17.4 |
3. Example 1, Experimental examples 1-5 detection of storage stability of Biomass Compound fertilizers
The caking problem affects the appearance quality of the compound fertilizer and brings inconvenience to the transportation and application of the compound fertilizer, so the storage stability (anti-caking performance) of the prepared biomass compound fertilizer is tested by adopting a briquetting method, 50g of compound fertilizer samples are filled in a circular ring under the conditions of 50 ℃ of temperature, 147N of pressure and 15 days, the shearing force data of a cylindrical compound fertilizer briquette is measured, and the test result is shown in table 4. It can be seen that the storage stability of the biomass compound fertilizer prepared in example 1 is much higher than that of the biomass compound fertilizer prepared in experimental examples 1 to 5.
TABLE 4
Note: the blocking resistance was (blank shear force-sample shear force)/blank shear force × 100%, and the blank shear force was 75.41N.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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.
Claims (10)
1. A method for preparing bio-mechanical pulp and biomass compound fertilizer from wheat straw leaves is characterized by comprising the following steps:
s1, adding water into the pre-treated wheat straw cut sections for hot water treatment, and adjusting the solution to be alkaline by using KOH in the hot water treatment process;
s2, performing thread rolling treatment on the wheat straw leaves processed in the step S1;
s3, adding alkaline biological enzyme into the wheat straw leaves processed in the step S2 for enzymolysis;
s4, grinding the wheat straw subjected to enzymolysis treatment in the step S3 to prepare bio-mechanical pulp;
s5, concentrating and evaporating the waste water generated by hot water discharge, the waste water generated by thread rolling treatment, the waste water generated by enzymolysis treatment and the waste water generated by grinding treatment to obtain residues, adjusting the pH of the residues by adopting phosphoric acid, and preparing the biomass compound fertilizer by adopting the residues after the pH adjustment.
2. The method for preparing bio-mechanical pulp and biomass compound fertilizer from wheat straw leaves as claimed in claim 1, wherein in step S1, the pretreatment mode is physical screening and dedusting; cutting the wheat grass leaves into 3-8cm small sections;
or, controlling the liquid ratio to be 1kg: 4-8L;
or, the temperature is controlled to be 80-100 ℃, and the treatment time is controlled to be 15-60 min.
3. The method for preparing bio-mechanical pulp and biomass compound fertilizer from wheat straw leaves as claimed in claim 1, wherein in step S1, the pH of hot water is adjusted to 10-14;
or, the pH of the wheat grass leaves reaches 7-9 at the end of the treatment.
4. The method for preparing bio-mechanical pulp and biomass compound fertilizer from wheat straw leaves as claimed in claim 1, wherein in step S2, the thread rolling compression ratio is controlled to be 1: 1-4.
5. The method for preparing bio-mechanical pulp and biomass compound fertilizer from wheat straw leaves as claimed in claim 1, wherein in the step S3, the conditions of enzymolysis are as follows: controlling the temperature to be 40-60 ℃, wherein the alkaline biological 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 0-4: 0-3: 0 to 1.5; controlling the liquid ratio at 1kg: 3-8L;
or, the enzymolysis treatment time is 30-90 min;
preferably, the enzyme activity ratio of the xylanase, the cellulase and the pectinase is 2.5-3.5: 1.5-2.5: 1;
preferably, the total dosage of the enzyme is 30-40 IU/mL.
6. The method for preparing bio-mechanical pulp and biomass compound fertilizer from wheat straw leaves as claimed in claim 1, wherein in the step S4, the refining process specifically comprises: and (3) carrying out high-concentration pulp grinding by using a KPF high-concentration disc grinder, wherein one-stage or two-stage pulp grinding is adopted, and the pulp grinding gap is 0.15-0.5 mm.
7. The method for preparing bio-mechanical pulp and biomass compound fertilizer from wheat straw leaves as claimed in claim 1, wherein in step S5, a multi-effect evaporator is used for concentration and evaporation; the heat energy is recovered for the hot water process of step S1.
8. The method for preparing bio-mechanical pulp and a biomass compound fertilizer from wheat straw leaves as claimed in claim 1, wherein in step S5, the mass ratio of the waste water generated by hot water outlet, the waste water generated by thread rolling treatment, the waste water generated by enzymolysis treatment and the waste water generated by grinding treatment is 2-5: 2-4: 1-5: 5-20;
or in the step S5, adjusting the pH of the residue to 6-7 by using phosphoric acid, drying, crushing and granulating to obtain the fertilizer.
9. A bio-mechanical pulp and/or biomass compound fertilizer prepared by the method of claim 1.
10. Use of the bio-mechanical pulp of claim 9 for the production of primary color packaging paper and paper based materials and/or use of biomass compound fertilizer for promoting crop growth.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009056017A1 (en) * | 2007-10-29 | 2009-05-07 | Shandong Tralin Paper Co., Ltd | A process for comprehensive utilization of stalks of grass-type plants |
| CN101451315A (en) * | 2007-12-05 | 2009-06-10 | 山东泉林纸业有限责任公司 | Method for comprehensive utilization of grass type stalk |
| CN101787656A (en) * | 2010-02-03 | 2010-07-28 | 中国科学院过程工程研究所 | Clean high-valued utilization method for straw resources |
| 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 |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009056017A1 (en) * | 2007-10-29 | 2009-05-07 | Shandong Tralin Paper Co., Ltd | A process for comprehensive utilization of stalks of grass-type plants |
| CN101451315A (en) * | 2007-12-05 | 2009-06-10 | 山东泉林纸业有限责任公司 | Method for comprehensive utilization of grass type stalk |
| CN101787656A (en) * | 2010-02-03 | 2010-07-28 | 中国科学院过程工程研究所 | Clean high-valued utilization method for straw resources |
| 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 |
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