CN111004055A - Resourceful treatment method for mixture of straw and livestock manure - Google Patents
Resourceful treatment method for mixture of straw and livestock manure Download PDFInfo
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- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F3/00—Fertilisers from human or animal excrements, e.g. manure
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
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- C12M1/00—Apparatus for enzymology or microbiology
- C12M1/107—Apparatus for enzymology or microbiology with means for collecting fermentation gases, e.g. methane
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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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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a method for recycling a mixture of straws and livestock manure, which comprises the following steps: a method for recycling a mixture of straws and livestock manure is characterized by comprising the following steps: (1) crushing straws: crushing the straws into sections; (2) decomposing the biological material: stacking the straws and the livestock manure layer by layer for decomposition; (3) flash evaporation and hydrothermal treatment: performing multi-stage flash evaporation hydrothermal treatment on the well-decomposed mixture of the straws and the livestock manure until the mixture is completely hydrolyzed; (4) primary dehydration treatment: carrying out solid-liquid separation on the hydrolyzed mixture; (5) preparing biogas: and (4) adding the filtrate obtained in the step (4) into an anaerobic tank, and carrying out anaerobic digestion reaction to obtain biogas. The method hydrolyzes the mixture of the straws and the livestock manure by a hydrothermal treatment technology without adding acidic or alkaline hydrolysis liquid, thereby accelerating the hydrolysis speed, shortening the recycling treatment period, improving the production efficiency and reducing the environmental pollution.
Description
Technical Field
The invention relates to the field of biomass resource treatment, in particular to a resource treatment method for a mixture of straws and livestock manure.
Background
China is a big agricultural country, and generates a large amount of biomass waste every year, mainly comprising crop waste and cultivation waste. Crop wastes are mainly straws in agricultural production of corn, rape, rice, wheat and the like, statistics shows that the annual theoretical resource quantity of the straws in China in recent years exceeds 8 hundred million tons, and the comprehensive utilization quantity is about 5 hundred million tons, but due to the lack of an effective treatment method, over half of the straws are directly backfilled and burned every year, and serious environmental pollution is caused. Meanwhile, the breeding industry in China is also developed, and various livestock and poultry excreta contain a large amount of organic matters (such as nitrogen, phosphorus and the like), and if the excrement is directly utilized or discharged without proper treatment, the environmental ecology can be seriously damaged. Therefore, under the current conditions of national strong environmental remediation and continuous deepening of environmental supervision, how to effectively treat biomass waste is not only beneficial to improving the environmental protection quality, but also beneficial to the service guarantee of people's life.
Currently, environmental protection enterprises have proposed a number of methods for treating crop waste and/or farming waste, which have good environmental and economic benefits in practical use. Such as: CN201821620340, CN201610850503, CN201811579152 and the like. In addition, according to the granted patent CN109020113A, the multi-stage flash evaporation sludge continuous hydrothermal treatment device developed and produced by our company has a good effect on municipal solid waste treatment, and can be practically and completely used for biomass hydrolysis treatment of crop wastes and cultivation wastes in the field of environmental protection.
In agricultural biomass wastes, straws and livestock manure belong to wastes with high fiber content and long biodegradation period. At present, the problems of longer resource treatment period, low efficiency, incomplete treatment and treatment, single resource product and the like generally exist in the technical products for resource treatment and treatment of the wastes. For example, hydrolysis is carried out to extract fiber and make paper separately, or anaerobic biogas generation is carried out to recover energy, but the treatment period is generally more than 20 days. In addition, in the pretreatment of materials, basically, acidic or alkaline hydrolysis liquid is added, and the acidic or alkaline hydrolysis liquid can cause great damage to the environment.
Disclosure of Invention
The invention aims to solve the problems that; aiming at the defects and shortcomings of the prior art, the method for recycling the mixture of the straws and the livestock and poultry manure is provided, the mixture of the straws and the livestock and poultry manure is subjected to pyrohydrolysis at high temperature and high pressure, the recycled fermentation liquor is utilized to carry out spray fermentation decomposition on the mixture, meanwhile, fibers which are difficult to hydrolyze are recycled as paper pulp raw materials, degraded biogas residues are used as organic fertilizer raw materials, biogas energy is rapidly recycled, and CO is realized2Emission reduction, shortened resource treatment period, reduced medicament addition, improved production efficiency and greatly reduced environmental pollution.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for recycling a mixture of straws and livestock manure is characterized by comprising the following steps:
(1) crushing straws: crushing the straws into sections for later use;
(2) decomposing the biological material: stacking the crushed straws and the livestock manure in the step (1) layer by layer for decomposition, and stirring and mixing the decomposed straws and the livestock manure for later use;
(3) flash evaporation and hydrothermal treatment: performing multi-stage flash evaporation hydrothermal treatment on the mixture of the well-decomposed straw and the livestock manure in the step (2) until the mixture is completely hydrolyzed for later use;
(4) primary dehydration treatment: carrying out solid-liquid separation on the mixture hydrolyzed in the step (3), and separating the filtrate obtained by separation for later use;
(5) preparing biogas: and (4) adding the filtrate obtained in the step (4) into an anaerobic tank, and carrying out anaerobic digestion reaction to obtain biogas.
The mixing of livestock manure and straw for fermentation is a common application of biological waste, acid or alkali is often added in the conventional technology for hydrolysis and reuse, and degradation liquid of the biological waste can cause pollution to the surrounding environment. This application is through carrying out multistage flash distillation hydrothermal treatment to the mixture, does not add acidity or alkaline hydrolysis liquid, can effectually avoid behind the acidity or the alkaline hydrolysis liquid to the pollution of environment. The hydrothermal treatment can accelerate the hydrolysis speed of organic matters in the mixture, improve the conversion rate of the organic matters in the subsequent anaerobic process, greatly shorten the retention time and realize high-efficiency and quick gas production. The method has the advantages that one production cycle of resource treatment does not exceed 10 days, and the shortest production cycle is about 7 days, so that the method has higher resource treatment efficiency compared with the same type.
Further, the filtrate separated in the step (6) can be used as fermentation liquor for the decomposition reaction in the step (2).
The mixture of the straws and the livestock manure contains a large amount of organic matters, and the solution after hydrolysis and anaerobic digestion reaction still contains a large amount of organic matters, so that the direct discharge can cause environmental pollution. The anaerobic digestion reaction needs microorganisms for fermentation, the microorganisms are subjected to growth fermentation by using hydrolyzed organic solution of straws and livestock manure, the growth conditions of the microorganisms are similar to the components of the mixture of the livestock manure and the straws, the strains are screened in the anaerobic fermentation process, the fermented solution can be recycled, and the recycled fermentation liquor is sprayed when the livestock manure and the straws are premixed for preliminary decomposition of the mixture, so that the decomposition efficiency is improved.
Further, the filter residue obtained by dehydration in the step (4) can be used for papermaking.
The conventional technology for recycling the straws and the livestock manure is to mix the livestock manure and the straws and ferment the mixture together to prepare the methane and the biological organic fertilizer. The carbon-nitrogen ratio is usually 20: 1-30: 1, so that the speed of producing the biogas by microbial fermentation is the fastest, the carbon-nitrogen ratio of the livestock manure is about 13-25, and the carbon-nitrogen ratio of the straws such as dry straws is more than 50, so the straws and the livestock manure are usually mixed for fermentation. However, since the crop straw is usually composed of lignin, cellulose, hemicellulose, pectin, wax and other compounds, the decomposition speed is slow, the gas production period is long, the crop straw is not easy to be utilized by soil, and the blockage of the methane tank is caused.
By adopting the technical scheme, solid-phase organic matters such as easily degradable fibers and the like in the mixture of the livestock manure and the straws are dissolved, macromolecular organic matters are hydrolyzed into micromolecular organic matters, the mixture after the hydrothermal treatment is subjected to solid-state separation, and the residual filter residue mainly takes the fibers in the straws as the main material and can be used as fiber pulp generated in the production process for papermaking or directly generating paper boards and the like. Meanwhile, the use of chemical additives and the emission of organic matters in the papermaking process are reduced, and the pollution to the environment is further reduced.
Further, the method is characterized by also comprising (6) secondary dehydration treatment: and (5) performing secondary dehydration on the solution subjected to the anaerobic digestion reaction in the step (5), and separating to obtain filter residues which can be used for preparing the bio-organic fertilizer.
Further, the length of the crushed straw in the step (1) is 20-45 mm.
Further, the solid content of the mixture of the decomposed straw and the livestock and poultry manure in the step (2) is 8-15%.
If the water content is too low or too high, the mixture of the straws and the livestock manure is not favorable for full hydrolysis and subsequent anaerobic digestion reaction, and in repeated production practice, the better range of the solid content is determined to be 8-15%, wherein the solid content is 12%, so that a better production effect can be achieved.
Further, the temperature of the flash evaporation hydrothermal treatment in the step (3) is 150-220 ℃, the pressure is 0.48-2.5 Mpa, and the reaction time is 30-60 min.
The hydrothermal treatment is carried out under the condition, the hydrolysis speed of the straws and the livestock manure is highest, and the hydrolysis time is usually 30-50 min.
Further, the multistage flash hydrothermal treatment in the step (3) adopts at least two flash reactors connected in series to carry out the flash hydrothermal treatment of high-temperature high-pressure steam injection.
Due to the adoption of the scheme, the mixed hydrolysis efficiency of the straws and the livestock manure can be improved.
Further, the carbon-nitrogen ratio of the mixture of the straws and the livestock manure is 25: 1-30: 1.
The carbon-nitrogen ratio of the organic matters is in the interval, and the gas production speed is the fastest.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the mixture of the straws and the livestock manure is hydrolyzed by a hydrothermal treatment technology, and no acidic or alkaline hydrolysate is added, so that the environmental pollution is reduced; meanwhile, the production efficiency is improved, and the biogas fermentation time is shortened from 20-30 days to 6-8 days (shortened by 70%).
2. The hydrolysis of the mixture of the livestock manure and the straw decomposes organic matters such as nitrogen, phosphorus and potassium in the straw, the solid separation of the mixture is carried out, the residual filter residue mainly takes fiber in the straw, and the filter residue can be used as fiber pulp generated in the production process to carry out papermaking or directly generate paper boards and the like. Meanwhile, the use of chemical additives and the emission of organic matters in the papermaking process are reduced, and the pollution to the environment is further reduced.
3. Although the solution obtained after the biogas is prepared by anaerobic fermentation contains a large amount of organic matters and a large amount of microorganisms, the solution is recycled for spraying, fermenting and decomposing the mixture, so that the decomposing speed is increased, and the pollution of the organic matters to the environment is further reduced.
4. The invention not only accelerates the treatment speed of the straws and the livestock manure, but also realizes the application of the straws and the livestock manure in the fermentation process, reduces the pollution to the environment and improves the production yield.
Drawings
FIG. 1 is a flow chart of a method for recycling a mixture of straw and livestock manure;
FIG. 2 is a schematic view of a system for recycling a mixture of straw and livestock manure.
Reference numerals:
1-a pulverizer, 2-a premixing tank, 3-a hydrothermal flash evaporation device, 4-a dehydrator A, 5-an anaerobic tank, and 6-a dehydrator B, 7-an organic fertilizer production device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
In the embodiment, the cow dung and the wheat straw are used as raw materials for application.
As shown in figure 1, a method for recycling a mixture of straw and cow dung comprises the following steps:
(1) 300kg of wheat straw (with a solid content of 90%) is crushed into sections of about 20-45 mm in a crusher 1;
(2) stacking the straw sections obtained in the step (1) and 200kg of cow dung (solid content is 20%), namely, stacking the straw sections and the layer of cow dung, namely, the straw sections and the layer of the cow dung are decomposed, and then transporting the decomposed cow dung and the straws to a premixing tank 2 to be mixed together;
(3) conveying the mixture of the straws and the cow dung in the premixing tank 2 to a hydrothermal flash evaporation device 3 for treatment, and performing three-stage hydrolysis reaction at the temperature of 200 ℃ and the pressure of 2.0Mpa, wherein the reaction time is controlled to be about 50 min;
(4) primary dehydration: cooling the mixture subjected to high-temperature and high-pressure thermal hydrolysis, and then performing primary dehydration at a dehydrator A4, wherein the dehydration mode is that a centrifuge performs dehydration, filtrate is collected for standby, and separated filter residue is dried and can be packaged as a raw material for papermaking and sent to a papermaking factory for industrial papermaking;
(5) conveying the dehydrated filtrate separated in the step (4) to an anaerobic tank 5, adding methane tank bottom mud accounting for 30% of the mass of the filtrate into the anaerobic tank, and then carrying out anaerobic digestion reaction at the temperature of 32 +/-2 ℃ for 8d to generate methane mainly;
(6) secondary dehydration: and (3) performing secondary dehydration treatment on the residual solution in the anaerobic tank 5 after anaerobic fermentation through a dehydrator B6, dehydrating through a plate-and-frame dehydrator by using a dehydrator B6, wherein filtrate obtained through dehydration contains a large amount of microorganisms, the filtrate can be used for fermenting fermentation liquor decomposed in the step (2) in the next production, and filter residues are conveyed to an organic fertilizer production device 7 to be processed and produced into a biological organic fertilizer for application.
The 300kg of straw and 200kg of cow dung can produce about 108m of methane3170kg of papermaking dry fiber and 140kg of organic fertilizer are produced.
The anaerobic gas production rate of the cow dung is improved from 200-300 Nm3/tTS to 250-350 Nm3/tTS, and the anaerobic gas production rate of the wheat straw is improved from 300-320 Nm3/tTS to 330-350 Nm 3/tTS.
Example 2
In the embodiment, the chicken manure and the rice straw are used as raw materials for application.
A method for recycling a mixture of straw and cow dung comprises the following steps:
(1) crushing 350kg of rice straws (with a solid content of 90%) into sections of about 20-45 mm;
(2) stacking the straw sections obtained in the step (1) and 150kg of chicken manure (the solid content is 30%) layer by layer, namely, straw sections and layer by layer of chicken manure, and then mixing the well-decomposed chicken manure and the straws together;
(3) carrying out hydrothermal treatment on the mixture of the straws and the chicken manure in the step (2), sending the mixed chicken manure and the straws into a hydrothermal reactor and a flash evaporation reactor in a high-temperature high-pressure hydrolysis system, and carrying out hydrolysis reaction of three-stage hydrothermal flash evaporation, wherein the hydrolysis temperature is set in the hydrolysis process at 150 ℃, the pressure is 2.5Mpa, and the hydrolysis time is controlled to be about 40 min;
(4) primary dehydration: cooling the mixture hydrolyzed at high temperature and high pressure, dewatering by a centrifuge, collecting filtrate for later use, drying the separated filter residue, and packaging the filter residue as a raw material for papermaking in a paper mill for industrial papermaking;
(5) conveying the dehydrated filtrate separated in the step (4) to an anaerobic tank for anaerobic digestion reaction, adding 32% of brewery anaerobic sludge of the mass of the filtrate into the anaerobic tank, controlling the temperature at 32 +/-2 ℃, reacting for 7d, and reacting to generate methane mainly;
(6) secondary dehydration: and (3) dehydrating the solution remaining after the reaction in the step (5), wherein a plate-and-frame dehydrator can be adopted for dehydration, filtrate obtained by dehydration contains a large amount of microorganisms, the filtrate can be used for fermenting the fermentation liquor decomposed in the step (2) in the next production, and filter residues can be recycled and produced into a biological organic fertilizer for application.
In the embodiment, 350kg of rice straw and 150kg of chicken manure can produce biogas exceeding 118m3189kg of papermaking dry fiber and 118kg of organic fertilizer are produced.
In the embodiment, the anaerobic gas production rate of the chicken manure is improved from 320-360 Nm3/tTS to 350-380 Nm3/tTS, and the anaerobic gas production rate of the rice straw is improved from 300-310 Nm3/tTS to 310-320 Nm 3/tTS.
Example 3
In the embodiment, pig manure and corncobs are used as raw materials.
A resource treatment method for a mixture of corncobs and pig manure comprises the following steps:
(1) crushing 425kg of corncobs (with a solid content of 80%) into particles of about 20-25 mm;
(2) laminating the corn cob sections obtained in the step (1) and 75kg of pig manure (the solid content is 20%) one layer of corn cob sections and one layer of pig manure for decomposition, and mixing the decomposed pig manure and the corn cobs together;
(3) carrying out hydrothermal treatment on the mixture of the corncobs and the pig manure in the step (2), sending the mixed pig manure and the corncobs into a hydrothermal reactor and a flash evaporation reactor in a high-temperature high-pressure hydrolysis system, and carrying out hydrolysis reaction of three-stage hydrothermal flash evaporation, wherein the hydrolysis temperature is set in the hydrolysis process at 220 ℃, the pressure is 0.48Mpa, and the hydrolysis time is controlled to be about 60 min;
(4) primary dehydration: cooling the mixture hydrolyzed at high temperature and high pressure, dewatering by a centrifuge, collecting filtrate for later use, drying the separated filter residue, and packaging the filter residue as a raw material for papermaking in a paper mill for industrial papermaking;
(5) conveying the dehydrated filtrate separated in the step (4) to an anaerobic tank for anaerobic digestion reaction, adding 35% of brewery anaerobic sludge of the mass of the filtrate into the anaerobic tank, controlling the temperature at 32 +/-2 ℃, reacting for 6d, and reacting to generate methane mainly;
(6) secondary dehydration: and (3) dehydrating the solution remaining after the reaction in the step (5), wherein a plate-and-frame dehydrator can be used for dehydrating the solution, the filtrate obtained by dehydration contains a large amount of microorganisms, the filtrate can be used for fermenting the fermented liquid decomposed in the step (2) in the next production, and the filter residue is used for producing a biological organic fertilizer.
In the embodiment, 425kg of corncobs and 75kg of pig manure can be used for producing biogas of more than 125m3206kg of papermaking dry fiber and 99kg of organic fertilizer are produced.
In the embodiment, the anaerobic gas production rate of the pig manure is improved from 200-300 Nm3/tTS to 250-350 Nm3/tTS, and the anaerobic gas production rate of the corncob is improved from 300-350 Nm3/tTS to 330-360 Nm 3/tTS; the residence time is shortened by more than 70 percent compared with the conventional residence time.
Example 4
The embodiment is further modified on the basis of embodiment 1, and specifically includes:
a method for recycling a mixture of straw and cow dung comprises the following steps:
(1) 300kg of wheat straw (with a solid content of 90%) is crushed into sections of about 20-45 mm in a crusher 1;
(2) laminating the straw sections in the step (1) and 200kg of cow dung (solid content is 20%), namely, laminating the straw sections and the layer of the cow dung for decomposition, uniformly spraying the filtrate obtained in the step (6) in the example 1 on the surface of each layer of the cow dung and the straw, wherein the spraying amount of the filtrate is half of the mass of the cow dung; then, transporting the decomposed cow dung and the straws to a premixing tank 2, and mixing the cow dung and the straws together;
(3) conveying the mixture of the straws and the cow dung in the premixing tank 2 to a hydrothermal flash evaporation device 3 for treatment, and performing three-stage hydrolysis reaction at the temperature of 200 ℃ and the pressure of 2.0Mpa, wherein the reaction time is controlled to be about 50 min;
(4) primary dehydration: cooling the mixture subjected to high-temperature and high-pressure thermal hydrolysis, and then performing primary dehydration at a dehydrator A4, wherein the dehydration mode is that a centrifuge performs dehydration, filtrate is collected for standby, and separated filter residue is dried and can be packaged as a raw material for papermaking and sent to a papermaking factory for industrial papermaking;
(5) conveying the dehydrated filtrate separated in the step (4) to an anaerobic tank 5, adding methane tank bottom mud accounting for 30% of the mass of the filtrate into the anaerobic tank, and then carrying out anaerobic digestion reaction at the temperature of 32 +/-2 ℃ for 6d to generate methane mainly;
(6) secondary dehydration: and (3) performing secondary dehydration treatment on the residual solution in the anaerobic tank 5 after anaerobic fermentation through a dehydrator B6, dehydrating through a plate-and-frame dehydrator by using a dehydrator B6, wherein filtrate obtained through dehydration contains a large amount of microorganisms, the filtrate can be used for fermenting fermentation liquor decomposed in the step (2) in the next production, and filter residues are conveyed to an organic fertilizer production device 7 to be processed and produced into a biological organic fertilizer for application.
The 300kg of straws and 200kg of cow dung can produce biogas of more than 115m3162kg of papermaking dry fiber and 138kg of organic fertilizer are produced.
In the embodiment, the anaerobic gas production rate of the cow dung is improved to 300-360 Nm3/tTS from 200-300 Nm3/tTS, and the anaerobic gas production rate of the wheat straw is improved to 330-360 Nm3/tTS from 300-320 Nm 3/tTS.
The above description is only exemplary of the invention, and any modification, equivalent replacement, and improvement made within the spirit and principle of the invention should fall within the protection scope of the invention.
Claims (9)
1. A method for recycling a mixture of straws and livestock manure is characterized by comprising the following steps:
(1) crushing straws: crushing the straws into sections for later use;
(2) decomposing the biological material: stacking the crushed straws and the livestock manure in the step (1) layer by layer for decomposition, and stirring and mixing the decomposed straws and the livestock manure for later use;
(3) flash evaporation and hydrothermal treatment: performing multi-stage flash evaporation hydrothermal treatment on the mixture of the well-decomposed straw and the livestock manure in the step (2) until the mixture completely reacts for later use;
(4) primary dehydration treatment: carrying out solid-liquid separation on the mixture hydrolyzed in the step (3), and separating the filtrate obtained by separation for later use;
(5) preparing biogas: and (4) adding the filtrate obtained in the step (4) into an anaerobic tank, and inoculating bacterial sludge into the anaerobic tank for anaerobic digestion reaction to obtain biogas.
2. The method for recycling a mixture of straw and livestock manure according to claim 1, further comprising (6) a secondary dehydration treatment: and (5) performing secondary dehydration on the solution subjected to the anaerobic digestion reaction in the step (5), and separating to obtain filter residues which can be used for preparing the bio-organic fertilizer.
3. The method for recycling the mixture of straw and livestock and poultry manure as claimed in claim 2, wherein the filtrate separated in step (6) can be used as fermentation liquid for spraying of the decomposition reaction in step (2).
4. The method for mixed resource treatment of straw and livestock manure according to claim 1, characterized in that the filter residue obtained by dehydration in step (4) can be used for paper making.
5. The resource treatment method for the mixture of the straws and the livestock and poultry manure according to claim 1, characterized in that the length of the straws crushed in the step (1) is 20-45 mm.
6. The method for recycling the mixture of straws and livestock and poultry manure according to claim 1, wherein the solid content of the mixture of straws and livestock and poultry manure after being decomposed in the step (2) is 8-15%.
7. The method for recycling the mixture of straws and livestock and poultry manure as claimed in claim 1, wherein the temperature of the flash evaporation hydrothermal treatment in the step (3) is 150-220 ℃, the pressure is 0.48-2.5 Mpa, and the reaction time is 30-60 min.
8. The method for recycling a mixture of straw and livestock manure as claimed in claim 7, wherein the hydrothermal treatment device used in the flash hydrothermal treatment in step (3) comprises at least two flash reactors connected in series.
9. The method for recycling a mixture of straws and livestock manure according to claim 1, characterized in that the carbon-nitrogen ratio of the mixture of straws and livestock manure is 20: 1-30: 1.
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