CN112853791B - 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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- 238000000034 method Methods 0.000 title claims abstract description 52
- 239000002028 Biomass Substances 0.000 title claims abstract description 49
- 150000001875 compounds Chemical class 0.000 title claims abstract description 48
- 229920001131 Pulp (paper) Polymers 0.000 title claims description 16
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- 239000002351 wastewater Substances 0.000 claims abstract description 52
- 238000004537 pulping Methods 0.000 claims abstract description 46
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Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B17/00—Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal
-
- 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
-
- 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
-
- 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
-
- 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)
-
- 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
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Microbiology (AREA)
- Pest Control & Pesticides (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Fertilizers (AREA)
- Paper (AREA)
Abstract
The invention provides a method for preparing biomechanical pulp and biomass compound fertilizer from wheat straw leaves, which comprises the following steps of S1, cutting the pretreated wheat straw leaves, adding water for hot water treatment, and adopting KOH to adjust the solution to be alkaline; s2, carrying out thread rolling treatment on the wheat straw leaves treated in the step S1; s3, adding alkaline biological enzyme into the wheat straw leaves treated in the step S2 for enzymolysis treatment; s4, pulping the wheat straw leaves subjected to the enzymolysis treatment of S3 to prepare biomechanical pulp; s5, concentrating and evaporating the wastewater generated by hot water, the wastewater generated by thread rolling treatment, the wastewater generated by enzymolysis treatment and the wastewater generated by pulping treatment to obtain residues, regulating the pH of the residues by adopting phosphoric acid, and preparing the biomass compound fertilizer by adopting the residues with the pH regulated. The invention can meet the requirements of producing primary color wrapping paper and paper-based materials, and can recycle byproducts to prepare the biomass compound fertilizer, thereby greatly reducing the emission of solid waste and realizing the high-value full utilization of wheat straw leaves.
Description
Technical Field
The invention belongs to the technical field of papermaking and fertilizer preparation, and relates to a method for preparing biomechanical pulp and biomass compound fertilizer from wheat straw leaves.
Background
The disclosure of this background section is only intended to increase the 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 already known to those of ordinary skill in the art.
The paper industry is not only the consumer product industry, but also the important basic raw material industry, and relates to various fields of life, religion, industry and agriculture, national defense, aviation and the like. The import of paper pulp in 2016 reaches 2106 ten thousand tons, the import of waste paper reaches 2850 ten thousand tons, the import dependence degree of pulping and papermaking fiber raw materials in 2016 is close to 50%, and the import of foreign waste paper makes up the gap of the fiber raw materials in China, thereby supporting the development of the papermaking industry in China. China is faced with the problem of serious shortage of papermaking raw materials. Therefore, the project group develops a new technology for preparing the biomechanical pulp by utilizing the agricultural straw to replace the waste paper raw material, and provides an important way for solving the shortage of the paper raw material and the high-valued utilization of the agricultural straw.
In the traditional papermaking process, wheat straw is used as an important papermaking raw material, and wheat straw leaves in the wheat straw are often required to be removed as much as possible in the material preparation process, because the wheat straw leaves are difficult to pulp despite the high hemicellulose content. Specifically, because the fibers in the wheat straw leaf are short, the content of the miscellaneous cells is high, the outer layer of the secondary wall is thicker, and the secondary wall is tightly adhered to the middle layer of the secondary wall, the fibers are difficult to remove in the pulping process, and therefore, the water absorption swelling and the fine fiber formation of the fibers are very difficult. If the fine fibers are excessively required during beating, excessive cutting of the fibers is inevitably caused, not only the strength of the finished paper is affected, but also water drainage is difficult during papermaking. But removing the wheat leaves not only causes the increase of the cost of the material preparation, but also greatly reduces the utilization rate of the wheat straw raw material. For this reason, CN 109629318A discloses a method for preparing bio-mechanical pulp from wheat straw leaves, which uses wheat straw leaves as raw materials and adopts hot water to cooperate with alkaline compound bio-enzyme technology to prepare primary color bio-mechanical pulp with high yield. 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 the agricultural straws.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for preparing bio-mechanical pulp and biomass compound fertilizer by using wheat straw leaves, and provides a method for preparing high-strength natural-color bio-mechanical pulp by using wheat straw leaves as raw materials and adopting hot water to treat whole wheat straw leaves in cooperation with alkaline biological enzymes, so that the requirements of producing primary color packaging paper and paper-based materials are met, and byproducts are recycled to prepare biomass compound fertilizer, thereby greatly reducing the emission of solid wastes and realizing the high-value full utilization of the wheat straw leaves. The preparation method is simple and convenient, green, clean and efficient, and has good practical application value and wide application prospect.
In order to achieve the above object, the present invention relates to the following technical solutions:
in a first aspect, the invention provides a method for preparing biomechanical pulp and biomass compound fertilizer from wheat straw leaves, which comprises the following steps:
s1, cutting pretreated wheat leaves, adding water into the wheat leaves for hot water treatment, and regulating the solution to be alkaline by adopting KOH in the hot water treatment process;
s2, performing thread rolling treatment on the wheat straw leaves treated in the step S1;
s3, adding alkaline biological enzyme into the wheat straw leaves treated in the step S2 for enzymolysis treatment;
s4, pulping the wheat straw leaves subjected to enzymolysis in the step S3 to prepare biomechanical pulp;
s5, concentrating and evaporating the wastewater generated by hot water, the wastewater generated by thread rolling treatment, the wastewater generated by enzymolysis treatment and the wastewater generated by pulping treatment to obtain residues, regulating the pH of the residues by adopting phosphoric acid, and preparing the biomass compound fertilizer by adopting the residues after regulating the pH.
According to the invention, the research on the original method shows that the biomass compound fertilizer prepared from the wastewater produced by the original method is poor in storage stability, and in this way, the physical state of the raw materials subjected to enzymolysis is changed by adopting the hot water combined thread rolling treatment method, and the wastewater produced by the raw materials is matched after enzymolysis treatment and pulping treatment, so that the composition of solid matters in the wastewater is changed, and when the solid matters are adopted for preparing 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 biomechanical pulp and/or the biomass compound fertilizer prepared by the method are provided.
In a third aspect of the invention, there is provided the use of the biomechanical pulp described above for the production of primary packaging paper and paper-based materials and/or the use of a biomass compound fertilizer for promoting crop growth.
The beneficial effects of the invention are as follows: according to the invention, whole wheat straw leaves are used as raw materials, in the whole preparation process of the biomechanical pulp, only hot water, KOH and alkaline bioenzyme are adopted by reasonably optimizing the preparation process and steps, the pH value of the biomechanical pulp is slightly alkaline when the pulp grinding is finished, the obtained biomechanical pulp has higher yield (60-85%), the conventional method of pulping by only using wheat straw leaves is broken, the wheat straw utilization rate is greatly improved, and compared with the traditional mechanical pulp, the pulping energy consumption can be saved by more than 40%, and various physical indexes meet the requirements of producing packaging paper and paper base materials.
In the invention, pulping washing water adopts concentration and evaporation treatment, and phosphoric acid is used for regulating the pH value of the pulping washing water when 15-35% of solid residues are recovered, and then the pulping washing water is granulated to prepare the biomass compound fertilizer, and the fertilizer contains a proper amount of N, K, P elements and a large amount of easily-degradable straw components with small particles. It should be noted that, unlike the traditional method for preparing fertilizer based on chemical pulp (chemical pulp requires high temperature and high alkali, the temperature is generally above 160 ℃ and about 20% of alkali consumption), the method adopts a low temperature and low alkali method, and the wheat straw leaves utilized in the method are good materials of natural potash fertilizer, so the method has natural 'congenital advantage' in fertilizer preparation, and simultaneously, the biomass compound fertilizer prepared by optimizing and screening process conditions has the advantages of high fertilizer efficiency, good storage stability and the like.
The preparation method is simple, energy-saving and environment-friendly, accords with the national industrial policies of 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 should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. 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 present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As described above, in the conventional papermaking process, wheat straw has been used as an important papermaking raw material, and wheat straw leaves in the wheat straw are often required to be removed as much as possible in the process of preparing the materials, because pulping is very difficult despite the high hemicellulose content in the wheat straw leaves.
In view of this, in one embodiment of the present invention, a method for preparing bio-mechanical pulp and biomass compound fertilizer from wheat straw leaves is provided, the method comprising:
s1, cutting pretreated wheat leaves, adding water into the wheat leaves for hot water treatment, and regulating the solution to be alkaline by adopting KOH in the hot water treatment process;
s2, performing thread rolling treatment on the wheat straw leaves treated in the step S1;
s3, adding alkaline biological enzyme into the wheat straw leaves treated in the step S2 for enzymolysis treatment;
s4, pulping the wheat straw leaves subjected to enzymolysis in the step S3 to prepare biomechanical pulp;
s5, concentrating and evaporating the wastewater generated by hot water, the wastewater generated by thread rolling treatment, the wastewater generated by enzymolysis treatment and the wastewater generated by pulping treatment to obtain residues, regulating the pH of the residues by adopting phosphoric acid, and preparing the biomass compound fertilizer by adopting the residues after regulating the pH.
In some embodiments of the present invention, in the step S1, the pretreatment mode is physical screening and dust removal; cutting wheat grass leaf into 3-8cm sections; the liquid ratio was controlled to 1kg:4-8L; the temperature is controlled to be 80-100 ℃, and the treatment time is controlled to be 15-60 min; the wheat straw leaves are cut into segments, and the wheat straw leaves are steamed for a period of time by controlling the liquid ratio, the steaming temperature and the steaming time, so that the wheat straw leaves can be favorably saturated with water and softened.
In some embodiments of the invention, in the step S1, the pH of the hot water is adjusted to 10-14; so that a small amount of hemicellulose, lignin, pectin and other substances are dissolved out of the wheat straw leaves, the wheat straw She Reshui is saturated and softened, and the pH value of the wheat straw leaves reaches 7-9 at the end of the treatment.
In some embodiments of the present invention, in the step S2, the compression ratio of the thread rolling is controlled to be 1:1-4, so that the wheat straw leaves achieve a uniform and good silk separating effect; the subsequent enzymolysis and pulping treatment are facilitated, and the energy consumption is reduced; in the first two steps, hot water is used for combined thread rolling treatment, so that wheat straw leaf fibers are less damaged, the specific surface area of raw materials is increased, biological enzymes can enter the cell wall and the cell wall more easily in the subsequent enzymolysis treatment process, and the biological enzymes act on chemical connection among lignin, cellulose and hemicellulose and macro-molecular substances such as undissolved pectin, so that the enzymatic pulping effect is further promoted.
In some embodiments of the present invention, in the step S3, the enzymolysis conditions are specifically: the temperature is controlled at 40-60 ℃, the alkaline biological enzyme is a compound enzyme of xylanase, cellulase and pectinase, and the total dosage is as follows: 10-80IU/mL, the enzyme activity ratio of xylanase, cellulase and pectase is (0-4): (0-3): (0 to 1.5), the addition amount of each enzyme is not 0; the liquid ratio is controlled at 1kg:3-8L; the enzymolysis treatment time is 30-90min; the fiber characteristics and pulping energy consumption of the pulp can be improved by adopting the synergistic effect of the various biological enzymes. Preferably, the enzyme activity ratio of xylanase, cellulase and pectinase is (2.5-3.5): (1.5-2.5): 1, a step of; preferably, the total enzyme dosage is 30-40IU/mL. Further researches show that the fertilizer efficiency and storage stability of the fertilizer can be further improved by matching with the subsequent addition amount of each waste water while the high performance of the slurry is ensured by optimizing the enzyme activity proportion of the biological compound enzyme.
Simultaneously performing interval stirring treatment; thereby fully acting the wheat straw leaves with biological enzyme for further softening the wheat straw leaf fiber raw material.
In some embodiments of the present invention, in the step S4, the pulping process specifically includes: performing high-concentration pulping by using a KPF high-concentration disc mill, wherein the rotating speed of a main shaft is 3000r/min, one-stage or two-stage pulping is adopted, and the pulping gap is 0.15-0.5mm; the heat and high temperature generated in the pulping process are utilized to inactivate biological enzymes so as to prevent the strength of the subsequent pulp from being influenced.
In some embodiments of the present invention, in the step S5, concentration evaporation is performed by using a multi-effect evaporator; the recovered heat energy is used for the hot water treatment of step S1.
In some embodiments of the present 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 pulping treatment is 2-5:2-4:1-5:5-20.
In some embodiments of the present invention, in the step S5, phosphoric acid is used to adjust the pH of the residue to 7, and the residue is dried, crushed and granulated.
In a further specific embodiment of the invention, the biomechanical pulp and/or the biomass compound fertilizer prepared by the method are provided.
In a further embodiment of the invention, the use of the above-described biomechanical pulp for the production of primary color packaging paper and paper-based materials and/or the use of a biomass composite fertilizer for promoting crop growth is provided.
The natural color biomechanical pulp can be widely applied to the production of primary color packaging paper and paper-based materials. And fluffing and forming the natural color biomechanical pulp to obtain the non-surface layer of the corrugated paper base paper and/or the box board 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 has better fertilizer efficiency and storage stability through test verification.
The invention is further illustrated by the following examples, which are not to be construed as limiting the invention. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. The test methods, in which specific conditions are not noted in the following examples, are generally conducted under conventional conditions. The biological enzyme adopted in the invention is from Shandong Long Kete enzyme preparation limited company and Norwegian biological enzyme preparation China company.
Example 1
A method for preparing biomechanical pulp and biomass compound fertilizer from wheat straw leaves comprises the following steps:
(1) Cutting wheat straw leaves subjected to physical selection and dust removal into small sections of raw materials of 4cm, and putting the small sections of raw materials into a normal temperature processor or a reaction kettle according to the following steps of 1:4, carrying out hot water treatment on the wheat straw leaves by liquid comparison, wherein the temperature is 100 ℃, and the treatment time is 30min. Adding a small amount of KOH into the mixture of the hot water and the wheat straw leaves in the reaction kettle or the processor, and adjusting the pH value of the hot water to be 14, so that a small amount of hemicellulose, lignin, pectin and other substances are dissolved in the wheat straw, and the pH value of the wheat straw leaves water reaches 8 when the wheat straw She Bao is softened by water.
(2) Placing 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 ensure that the wheat straw achieves a uniform and good thread-separating effect;
technological conditions of thread rolling: pressure 1 during thread rolling: 3.
(3) The wheat straw leaves after softening and dividing are treated with alkaline biological enzyme in a biological processor or a biological reactor for 60min, the temperature is controlled at 55 ℃, the liquid ratio is controlled at 1kg:5L, and the wheat straw leaves are continuously stirred and mixed so that the wheat straw leaves fully act with the biological enzyme 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: the enzyme activity ratio of xylanase, cellulase and pectase is 3:2:1.
(4) Pulping the wheat straw leaves after biological treatment by a pulping machine to ensure that the pulping degree of the paper pulp reaches 40 DEG SR.
(5) The wheat straw leaf biomechanical pulp after being ground is disintegrated by a fiber fluffer to be evenly mixed, and then is made into 60g/m by a paper sheet former 2 Is a primary color corrugated base paper. Its physical strength was then measured. All physical indexes meet the requirements of producing primary color corrugated raw paper packaging paper.
(6) Carrying out evaporation concentration on the wastewater generated by hot water, the wastewater generated by thread rolling treatment, the wastewater generated by enzymolysis treatment and the wastewater generated by pulping treatment according to a mass ratio of 5:4:5:15 by adopting a multi-effect evaporator to obtain residues, and recovering heat energy for heating the hot water treated by the hot water in the step (1); and regulating the pH value of the residue to 6 by adopting phosphoric acid, and drying, crushing and granulating to prepare the biomass organic fertilizer.
Example 2
A method for preparing biomechanical pulp and biomass compound fertilizer from wheat straw leaves comprises the following steps:
(1) Cutting wheat straw leaves subjected to physical selection and dust removal into 3cm sections of raw materials, putting the sections of raw materials into a normal temperature processor or a reaction kettle, and carrying out hot water treatment on the wheat straw leaves according to the liquid ratio of 1:5, wherein the temperature is 100 ℃, and the treatment time is 40min. Adding a small amount of KOH into the mixture of the hot water and the wheat straw leaves in the reaction kettle or the processor, and adjusting the pH value of the hot water to 13, so that a small amount of hemicellulose, lignin, pectin and other substances are dissolved in the wheat straw, and the pH value of the wheat straw leaves water reaches 8 when the wheat straw She Bao is softened by water.
(2) Placing 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 ensure that the wheat straw achieves a uniform and good thread-separating effect;
technological conditions of thread rolling: pressure 1 during thread rolling: 3.
(3) The wheat straw leaves after softening and dividing are treated with alkaline biological enzyme in a biological processor or a biological reactor for 50min, the temperature is controlled at 50 ℃, the liquid ratio is controlled at 1:6, and the wheat straw leaves are continuously stirred and mixed, so that the wheat straw leaves fully act with the biological enzyme, and the fibers of the wheat straw leaves are further softened. The alkaline biological enzyme is a compound enzyme of xylanase, cellulase and pectinase, and the total dosage is as follows: the enzyme activity ratio of xylanase, cellulase and pectase is 2.5:1.6:1.
(4) Pulping the wheat straw leaves after biological treatment by a pulping machine to ensure that the pulping degree of the paper pulp reaches 38 DEG SR.
(5) The wheat straw leaf biomechanical pulp after being ground is disintegrated by a fiber fluffer to be evenly mixed, and then is made into 70g/m by a paper sheet former 2 Is a primary color corrugated base paper. Its physical strength was then measured. All physical indexes reachThe requirement for producing primary color corrugated raw paper packaging paper.
(6) Carrying out evaporation concentration on the wastewater generated by hot water, the wastewater generated by thread rolling treatment, the wastewater generated by enzymolysis treatment and the wastewater generated by pulping treatment according to a mass ratio of 5:2:5:20 by adopting a multi-effect evaporator to obtain residues, and recovering heat energy for heating the hot water treated by the hot water in the step (1); and regulating the pH value of the residue to 6 by adopting phosphoric acid, and drying, crushing and granulating to prepare the biomass organic fertilizer.
Example 3
A method for preparing biomechanical pulp and biomass compound fertilizer from wheat straw leaves comprises the following steps:
(1) Cutting wheat straw leaves subjected to physical selection and dust removal into 5cm sections of raw materials, putting the sections of raw materials into a normal temperature processor or a reaction kettle, and carrying out hot water treatment on the wheat straw leaves according to the liquid ratio of 1:4, wherein the temperature is 95 ℃, and the treatment time is 60 minutes. Adding a small amount of KOH into the mixture of the hot water and the wheat straw leaves in the reaction kettle or the processor, and adjusting the pH value of the hot water to be 14, so that a small amount of hemicellulose, lignin, pectin and other substances are dissolved in the wheat straw, and the pH value of the wheat straw leaves water reaches 8 when the wheat straw She Bao is softened by water.
(2) Placing 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 ensure that the wheat straw achieves a uniform and good thread-separating effect;
technological conditions of thread rolling: pressure 1 during thread rolling: 3.
(3) The wheat straw leaves after softening and dividing are treated with alkaline biological enzyme in a biological processor or a biological reactor for 70min, the temperature is controlled at 55 ℃, the liquid ratio is controlled at 1:5, and the wheat straw leaves are continuously stirred and mixed so that the wheat straw leaves fully act with the biological enzyme, and the fibers of the wheat straw leaves are further softened. The alkaline biological enzyme is a compound enzyme of xylanase, cellulase and pectinase, and the total dosage is as follows: the enzyme activity ratio of xylanase, cellulase and pectase is 3.5:2.5:1.
(4) Pulping the wheat straw leaves after biological treatment by a pulping machine to ensure that the pulping degree of the paper pulp reaches 42 DEG SR.
(5) Device for defibering wheat straw leaf biological mechanical pulp after grindingFluffing to uniformly mix, and then forming 60g/m on a paper former 2 Is a primary color corrugated base paper. Its physical strength was then measured. All physical indexes meet the requirements of producing primary color corrugated raw paper packaging paper.
(6) Carrying out evaporation concentration on the wastewater generated by hot water, the wastewater generated by thread rolling treatment, the wastewater generated by enzymolysis treatment and the wastewater generated by pulping treatment according to a mass ratio of 4:4:2:20 by adopting a multi-effect evaporator to obtain residues, and recovering heat energy for heating the hot water treated by the hot water in the step (1); and regulating the pH value of the residue to 6 by adopting phosphoric acid, and drying, crushing and granulating to prepare the biomass organic fertilizer.
Experimental example 1: the method is similar to example 1, except that step (2) is omitted, the total dosage is 50IU/mL, and the enzyme activity ratio is 2:2:1.
experimental example 2: the method is the same as in example 1, except that the biological enzyme after thread rolling on the TSP360 thread rolling machine is adjusted to be a compound enzyme of xylanase, cellulase and pectase, the total dosage is 50IU/mL, and the enzyme activity ratio is 2:2:1.
experimental example 3: the method is the same as in example 1, except that the mass ratio of the wastewater generated by the hot water, the wastewater generated by the thread rolling treatment, the wastewater generated by the enzymolysis treatment and the wastewater generated by the pulping treatment is controlled to be 1:4:2:20.
Experimental example 4: the method is the same as in example 1, except that the mass ratio of the wastewater generated by the hot water, the wastewater generated by the thread rolling treatment, the wastewater generated by the enzymolysis treatment and the wastewater generated by the pulping treatment is controlled to be 8:3:5:20.
Experimental example 5: the method is similar to example 1, except that the mass ratio of the wastewater generated by hot water, the wastewater generated by thread rolling treatment, the wastewater generated by enzymolysis treatment and the wastewater generated by pulping treatment is controlled to be 4:3:2:10.
And (3) effect verification:
1. table 1 shows that the physical properties of the slurries prepared in example 1 and experimental examples 1 and 2 are better, and the requirements of producing natural color packaging paper and paper-based materials are met. Experimental examples 2-5 the physical properties of the slurry were the same as in example 1.
Table 1 comparison list of physical Properties index of formed pulp of biomechanical pulp
2. Example 1, experimental examples 1-5 preparation of Biomass composite fertilizer efficiency detection
(1) Corn pot test
The bio-organic fertilizer prepared in example 1 and experimental examples 1-5 was applied to potted corn for test, and a biomass compound fertilizer (3 g/kg soil) was applied in the corn seedling stage, and the results are shown in table 2, which show that both example 1 and experimental examples 1-5 significantly increased corn biomass compared to the CK of the control group without fertilizing, with the best effect of 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 1-5 was applied to potted wheat for test, and a biomass compound fertilizer (5 g/kg soil) was applied during the seedling stage of wheat, and the results are shown in table 3, which indicate that both example 1 and experimental examples 1-5 increased the biomass of wheat, with the best effect of example 1, compared to the CK of the control group without fertilizing.
TABLE 3 Table 3
| Examples | 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 preparation of Biomass Compound fertilizer storage stability detection
In the past, 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 according to the condition control of 50 ℃ and 147N of pressure for 15 days, and the shearing force data are measured on cylindrical compound fertilizer briquettes, and the test results are 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 experimental examples 1-5.
TABLE 4 Table 4
Note that: anti-blocking ratio= (blank shear force-sample shear force)/blank shear force x 100%, blank shear force is 75.41N.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A method for preparing bio-mechanical pulp and biomass compound fertilizer from wheat straw leaves is characterized by comprising the following steps:
s1, cutting pretreated wheat leaves, adding water into the wheat leaves for hot water treatment, and regulating the solution to be alkaline by adopting KOH in the hot water treatment process;
s2, performing thread rolling treatment on the wheat straw leaves treated in the step S1;
s3, adding alkaline biological enzyme into the wheat straw leaves treated in the step S2 for enzymolysis treatment;
s4, pulping the wheat straw leaves subjected to enzymolysis in the step S3 to prepare biomechanical pulp;
s5, concentrating and evaporating the wastewater generated by hot water, the wastewater generated by thread rolling treatment, the wastewater generated by enzymolysis treatment and the wastewater generated by pulping treatment to obtain residues, regulating the pH of the residues by adopting phosphoric acid, and preparing the biomass compound fertilizer by adopting the residues with the pH regulated;
in the step S5, the mass ratio of the wastewater generated by hot water, the wastewater generated by thread rolling treatment to the wastewater generated by enzymolysis treatment to the wastewater generated by pulping treatment is 5:4:5:15;
in the step S5, phosphoric acid is adopted to adjust the pH of the residue to 6-7, and the residue is obtained by drying, crushing and granulating;
in the step S1, the liquid ratio is controlled to be 1kg:4-8L;
in the step S2, the compression ratio of the thread rolling is controlled to be 1:1-4;
in the step S3, the enzymolysis conditions specifically include: the temperature is controlled at 40-60 ℃, the alkaline biological enzyme is a compound enzyme of xylanase, cellulase and pectinase, and the total dosage is as follows: the enzyme activity ratio of xylanase, cellulase and pectase is 2.5-3.5, and the enzyme activity ratio is 10-80 IU/mL: 1.5-2.5:1, a step of; the liquid ratio is controlled at 1kg:3-8L.
2. The method for preparing biomechanical pulp and biomass compound fertilizer from wheat straw leaves according to claim 1, wherein in the step S1, the pretreatment mode is physical screening and dust removal; the wheat leaves are cut into 3-8cm small sections.
3. The method for preparing biomechanical pulp and biomass compound fertilizer from wheat straw leaves according to claim 1, wherein in the step S1, the temperature is controlled to be 80-100 ℃, and the treatment time is controlled to be 15-60min.
4. The method for preparing biomechanical pulp and biomass composite fertilizer from wheat straw leaves according to claim 1, wherein in the step S1, the hot water pH is adjusted to 10-14.
5. The method for preparing biomechanical pulp and biomass composite fertilizer from wheat straw leaves according to claim 1, wherein in the step S1, the pH value of the wheat straw leaves reaches 7-9 at the end of the treatment.
6. The method for preparing biomechanical pulp and biomass compound fertilizer from wheat straw leaves according to claim 1, wherein in the step S3, the enzymolysis treatment time is 30-90min.
7. The method for preparing biomechanical pulp and biomass compound fertilizer from wheat straw leaves according to claim 1, wherein in the step S3, the total enzyme dosage is 30-40IU/mL.
8. The method for preparing biomechanical pulp and biomass compound fertilizer from wheat straw leaves according to claim 1, wherein in the step S4, the pulping process specifically comprises: high-concentration pulping is carried out by using a KPF high-concentration disc mill, one-stage or two-stage pulping is adopted, and the pulping gap is 0.15-0.5 mm.
9. The method for preparing biomechanical pulp and biomass compound fertilizer from wheat straw leaves according to claim 1, wherein in the step S5, concentration and evaporation are performed by using a multi-effect evaporator; the recovered heat energy is used for the hot water treatment of step S1.
10. A biomass composite fertilizer prepared by the method of claim 1.
11. Use of the biomass composite fertilizer of claim 10 for promoting crop growth.
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