CN111960893A - Method for preparing plant organic nutrient solution by secondary fermentation biogas slurry - Google Patents

Method for preparing plant organic nutrient solution by secondary fermentation biogas slurry Download PDF

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CN111960893A
CN111960893A CN202010953346.9A CN202010953346A CN111960893A CN 111960893 A CN111960893 A CN 111960893A CN 202010953346 A CN202010953346 A CN 202010953346A CN 111960893 A CN111960893 A CN 111960893A
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biogas slurry
content
fermentation
nutrient solution
equal
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李杨
于修斌
张万军
邹宁
许子强
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Liford Agricultural Technology Huizhou Co ltd
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Liford Agricultural Technology Huizhou Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B3/00—Fertilisers based essentially on di-calcium phosphate
    • 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
    • C05F17/20—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation using specific microorganisms or substances, e.g. enzymes, for activating or stimulating the treatment
    • 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
    • C05F17/40—Treatment of liquids or slurries
    • 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
    • C05F17/50—Treatments combining two or more different biological or biochemical treatments, e.g. anaerobic and aerobic treatment or vermicomposting and aerobic treatment
    • 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
    • C05F17/80—Separation, elimination or disposal of harmful substances during the treatment
    • 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
    • C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
    • 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
    • C05G5/20—Liquid fertilisers
    • C05G5/23—Solutions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
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  • Microbiology (AREA)
  • Engineering & Computer Science (AREA)
  • Pest Control & Pesticides (AREA)
  • Tropical Medicine & Parasitology (AREA)
  • Toxicology (AREA)
  • Fertilizers (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

A method for preparing plant organic nutrient solution by secondary fermentation biogas slurry comprises the following steps: mixing livestock and poultry manure and crushed straws to obtain an manure straw mixture, blending C/N and water content in the manure straw mixture, placing the manure straw mixture into anaerobic fermentation equipment for anaerobic fermentation at constant temperature to obtain basic biogas slurry, placing the basic biogas slurry into solid-liquid separation equipment for separation into biogas residues and biogas slurry, placing the separated biogas slurry into fermentation equipment, adding organic matters containing N elements and/or K elements and inorganic matters containing P elements into the biogas slurry, adjusting the nitrogen, phosphorus and potassium element content of the biogas slurry, adding free amino acids, blending the amino acid content, adding a facultative fermentation microbial inoculum and bacillus laterosporus for facultative fermentation, and filtering after fermentation to obtain an organic nutrient solution. The method of the invention can reasonably utilize biogas slurry to protect environment, and the prepared organic nutrient solution is beneficial to plant growth and fruit growth.

Description

Method for preparing plant organic nutrient solution by secondary fermentation biogas slurry
Technical Field
The invention relates to the technical field of biogas slurry utilization, in particular to a method for preparing a plant organic nutrient solution by secondary fermentation biogas slurry.
Background
Anaerobic fermentation is the most common livestock manure treatment method in livestock breeding in China at present, and has the characteristics of cleanness, environmental protection and reutilization. However, biogas slurry and biogas residues generated by anaerobic fermentation also become very large pollution sources, particularly the biogas slurry is heavy, the biogas slurry contains inorganic salt components with higher concentration, particularly higher sodium ion content, according to detection, BOD15000-18000, COD6000-7000, ammonia nitrogen 1200-1500 and SS600-1000 of the biogas slurry can be said to cause serious salinization in fields after years if the biogas slurry is directly discharged to the fields; if the water is discharged to rivers, lakes and other water areas, the water body can be in an eutrophication state, so that a large amount of organisms such as blue algae and the like in the water can be propagated, and the water body is deteriorated.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a method for preparing organic plant nutrient solution by secondary fermentation of biogas slurry, on one hand, biogas slurry can be reasonably utilized to protect the environment, on the other hand, the prepared organic nutrient solution is beneficial to the absorption and growth of plants, and the fruit setting rate and the fruit mature period are improved.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for preparing plant organic nutrient solution by secondary fermentation biogas slurry comprises the following steps:
(1) preparing basic biogas slurry: mixing livestock and poultry manure and crushed straws to obtain a manure straw mixture, blending the C/N in the manure straw mixture to be 25-30/1, adding water into the manure straw mixture to ensure that the water content in the manure straw mixture is 85-90%, placing the manure straw mixture after adding water into anaerobic fermentation equipment, and fermenting at the constant temperature of 35.5-37.5 ℃ for 25-30 days to obtain basic biogas slurry for later use;
(2) solid-liquid separation: placing the fermented basic biogas slurry into solid-liquid separation equipment, and carrying out solid-liquid separation on the basic biogas slurry to obtain separated biogas residues and biogas slurry;
(3) preparing nitrogen, phosphorus and potassium elements: adding organic matters containing N elements and K elements and inorganic matters containing P elements into the separated biogas slurry, so that the content of the N elements in the biogas slurry accounts for 5-5.5% by mass of the biogas slurry, the content of the P elements accounts for 2-2.5% by mass of the biogas slurry, and the content of the K elements accounts for 5-5.5% by mass of the biogas slurry;
(4) and (3) blending amino acid content: adding amino acid into the biogas slurry obtained after adding the nitrogen, phosphorus and potassium elements to ensure that the content of the amino acid in the biogas slurry is more than or equal to 50-100 g/kg;
(5) and (3) secondary facultative fermentation: adding a microbial inoculum into the biogas slurry obtained after the amino acid is added for secondary fermentation, keeping the temperature at 25-30 ℃, and standing for 10-15 days;
(6) filtering impurities: and (3) placing the biogas slurry after the secondary fermentation into a filtering device to filter impurities, and filtering the impurities in the biogas slurry to obtain the organic nutrient solution. According to the invention, anaerobic fermentation is adopted in the step (1), so that the oxygen content in fermentation equipment is reduced, and the reproduction of fecal escherichia coli and the growth of roundworm eggs in livestock and poultry manure are inhibited, so that the fecal escherichia coli and roundworm eggs can be eliminated, and the death rate of the fecal escherichia coli and roundworm eggs can reach the national standard of organic fertilizer NY 525-2012; adding nitrogen, phosphorus and potassium elements in the step (3) and adding amino acid in the step (4) to enable the total nutrient content in the organic nutrient solution prepared by the method to reach the national standard of organic fertilizer NY525-2012, adding a microbial inoculum in the step (5) to perform secondary facultative fermentation to enable inorganic salt in the mixed solution to become a macromolecular group which can be precipitated, and then filtering in the step (6) to effectively remove redundant inorganic salt in the mixed solution to enable the content of each inorganic salt in the mixed solution to reach the standard of the organic nutrient solution, so that the organic nutrient solution can be used as the organic nutrient solution in the field of crop planting.
Further, in the solid-liquid separation step, the content of water insoluble matters in the biogas slurry after the solid-liquid separation is less than or equal to 5 g/L. The amount of water insoluble in the biogas slurry is controlled to be lower than 5 g/L, so that the addition amount required by each nutrient can be better mastered, the proportioning error is reduced, and the proportioning production efficiency is improved.
Further, in the step of blending nitrogen, phosphorus and potassium elements, the organic matter containing the N element is one or two of bean pulp and rapeseed pulp. The bean pulp and the rapeseed meal are residual products after crop processing, are rich in sources and low in price, and can effectively reduce the cost of the production process of the invention on one hand and reasonably recycle the residual products after crop processing on the other hand.
Further, in the step of blending nitrogen, phosphorus and potassium elements, the organic matter containing the K element is plant ash. The plant ash has rich sources and low price, and can effectively reduce the cost of the production process.
Further, in the step of preparing nitrogen, phosphorus and potassium elements, the inorganic substance containing the P element is bone calcium hydrogen phosphate. The bone calcium hydrophosphate is produced by using bone meal as a main raw material through extraction and chemical reaction, is recycled, has rich sources and low price, and can effectively reduce the cost in the production process.
Further, in the step of formulating the content of amino acid, the amino acid is free amino acid. The amino acid is a necessary nutrient substance in the growth process of the plant, and can promote the photosynthesis of the plant, promote the germination of the plant and the growth of roots; the free amino acid is easier to be absorbed by the plant, the effects of promoting the photosynthesis of the plant, promoting the sprouting and stimulating the root growth are better, the free amino acid and the slightly soluble element have a chelation reaction, so that the slightly soluble element generates a chelate which is good in solubility and easy to be absorbed by the plant, the plant absorption is facilitated, the free amino acid can also promote the germination of plant pollen and the length growth of a pollen tube, and the fruit setting rate is improved; for the fruits of plants, the free amino acids have the functions of strengthening cell walls, prolonging the quality guarantee period and improving the mature period of the fruits.
Further, in the secondary facultative fermentation step, the microbial inoculum adopts facultative fermentation microbial inoculum and bacillus laterosporus. The organic acid secreted by the bacillus laterosporus can effectively passivate inorganic salt in the biogas slurry to form macromolecular groups, and precipitates can be formed and filtered to be removed.
Further, in the step of filtering the impurities, the filtering apparatus adopts a filtering net of 100-200 meshes for filtering.
Furthermore, in the step of filtering impurities, the total nutrient content in the organic nutrient solution is more than or equal to 120g/kg, the medium trace elements are more than or equal to 2g/kg, the number of faecal escherichia coli groups is less than or equal to 100/g, the ascarid egg death rate is more than or equal to 95%, the total arsenic content is less than or equal to 15mg/kg, the total mercury content is less than or equal to 2mg/kg, the total lead content is less than or equal to 50mg/kg, the total chromium content is less than or equal to 150mg/kg, the total cadmium content is less than or equal to 3mg/kg, the water-insoluble substances in the organic nutrient solution are less than or equal to 5g/kg, and the mass specific gravity is 1:1.3-1.
The invention has the beneficial effects that:
1. the cost of the raw materials is low; the invention relates to a method for preparing plant organic nutrient solution by secondary fermentation biogas slurry, which adopts basic biogas slurry as a product obtained by fermenting livestock and poultry manure, organic matter containing N element added in the preparation process adopts one or two of bean pulp and rapeseed pulp, organic matter containing K element adopts plant ash, inorganic matter containing P element adopts bone calcium hydrogen phosphate, the products have rich sources and low price, and can effectively reduce the production cost of the invention, so that the cost of raw materials is low;
2. the biogas slurry is reasonably utilized to play a role in protecting the environment; the biogas slurry after the livestock and poultry manure fermentation is treated by the method, the biogas slurry can be effectively utilized, elements in the biogas slurry are balanced, the biogas slurry is converted into organic nutrient solution which can be placed in a field for use, the problems of land salinization or water deterioration and the like caused by direct discharge of the biogas slurry to the field or a water area are reduced, and the effect of protecting the environment is achieved;
3. the prepared organic nutrient solution is beneficial to plant growth; in the preparation process of the method, various elements necessary for plant growth such as nitrogen, phosphorus and potassium are added, and free amino acid which is easily absorbed by plants is also added, so that the effect of the free amino acid on promoting plant photosynthesis, promoting germination and stimulating root growth is better;
4. the prepared organic nutrient solution is beneficial to the absorption of plants; free amino acid is added into the organic nutrient solution prepared by the invention, and the free amino acid and the slightly soluble element have a chelation reaction, so that the slightly soluble element generates a chelate which has good solubility and is easy to be absorbed by crops, and the chelate is favorable for the absorption of plants;
5. the prepared organic nutrient solution improves the fruit setting rate of plants and the mature period of fruits; free amino acid is added into the organic nutrient solution, and the free amino acid can also promote the germination of plant pollen and the length growth of a pollen tube, so that the fruit setting rate is improved; for the fruits of plants, the free amino acids have the functions of strengthening cell walls, prolonging the quality guarantee period and improving the mature period of the fruits.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the following provides a detailed description of the product of the present invention with reference to the examples.
The first embodiment is as follows:
a method for preparing plant organic nutrient solution by secondary fermentation biogas slurry comprises the following steps:
(1) mixing livestock and poultry manure and crushed straws to obtain a manure straw mixture, blending the C/N in the manure straw mixture to be 25-30/1, adding water into the manure straw mixture to ensure that the water content in the manure straw mixture is 85-90%, placing the manure straw mixture after adding water into anaerobic fermentation equipment, and fermenting at the constant temperature of 37.5 ℃ for 25 days to obtain basic biogas slurry for later use; in the anaerobic fermentation process of the embodiment, the PH value of the biogas slurry needs to be measured, and is maintained between 7 and 7.5, so that the anaerobic fermentation process can be in a weakly alkaline fermentation state, the fermentation state is efficient and stable, and if the PH value of the biogas slurry is lower than 7.0 or higher than 8.0, the biogas slurry is neutralized in advance; in the anaerobic fermentation process, oxygen is isolated for fermentation, so that the fermentation chamber is in an anaerobic state, the propagation of fecal escherichia coli and the growth of roundworm eggs in livestock and poultry manure can be effectively inhibited, even the fecal escherichia coli and the roundworm eggs die due to oxygen deficiency, and thus the fecal escherichia coli and the roundworm eggs can be eliminated, and the death rate of the fecal escherichia coli and the roundworm eggs can reach the national standard of organic fertilizer NY 525-2012;
(2) solid-liquid separation: placing the fermented basic biogas slurry in the step (1) into solid-liquid separation equipment, and carrying out solid-liquid separation on the basic biogas slurry to obtain separated biogas residues and biogas slurry; in this embodiment, the content of water-insoluble matters in the separated biogas slurry is less than or equal to 5 g/l; the treatment mode adopted by the solid-liquid separation is centrifugal treatment, and heavy metals in part of the basic biogas slurry can be removed in the centrifugal treatment process, so that the content of the heavy metals in the basic biogas slurry is reduced;
(3) preparing nitrogen, phosphorus and potassium elements: placing the biogas slurry obtained in the step (2) into a fermentation bin, adding an organic matter containing N element, an organic matter containing K element and an inorganic matter containing P element into the biogas slurry in the fermentation bin, and controlling the content of N element in the biogas slurry to be 5% by mass, the content of P element to be 2% by mass and the content of K element to be 5% by mass; in this embodiment, the organic matter containing N element is rapeseed meal, 100kg of rapeseed meal is added to each ton of biogas slurry, the organic matter containing K element is plant ash, 100kg of plant ash is added to each ton of biogas slurry, the inorganic matter containing P element is bone calcium hydrogen phosphate, i.e. bone meal, and 40kg of bone calcium hydrogen phosphate is added to each ton of biogas slurry;
(4) and (3) blending amino acid content: adding free amino acid into the biogas slurry obtained in the step (3) to enable the content of the free amino acid in the biogas slurry to be 50g/kg of the mass percentage of the biogas slurry; in the embodiment, the biogas slurry is used as a basic raw material, and the free amino acid is added, so that on one hand, the slightly soluble elements in the mixture and the free amino acid can generate a chelation reaction, and the slightly soluble elements can generate a chelate which is good in solubility and easy to be absorbed by plants, so that the plant absorption is facilitated; on the other hand, when the plant is exposed to high temperature, low temperature and frost. Before and after the stress pressure of insect pests, hailstones and the like which influence the metabolism of plants, free amino acid can provide amino acid directly related to stress physiology for the plants after high-activity enzymolysis, so that the plant protection and recovery function is realized, and the temperature resistance, drought resistance, waterlogging resistance, insect pest resistance and other capabilities of the plants are improved; the free amino acid has better effects of promoting plant photosynthesis, promoting germination and stimulating root growth; the free amino acid can also promote the germination of plant pollen and the length growth of a pollen tube, and the fruit setting rate is improved; for the fruits of plants, the free amino acid has the functions of enhancing cell walls, prolonging the quality guarantee period and improving the mature period of the fruits;
(5) and (3) secondary facultative fermentation: adding a facultative aerofermentation bacterial agent and bacillus laterosporus into the biogas slurry obtained in the step (4) for secondary fermentation, wherein in the embodiment, the facultative aerofermentation bacterial agent comprises saccharomycetes, lactic acid bacteria and the like, and the total bacterial number of the saccharomycetes, the lactic acid bacteria, the bacillus laterosporus and the like is 1.0 multiplied by 1010cfu/g, wherein in the process of facultative fermentation, the pH value of the biogas slurry is maintained at 7.0-7.5, the temperature of the facultative fermentation is 30 ℃, and the time of the facultative fermentation is 10 days; when the oxygen is sufficient in the early stage, the facultative yeast, the facultative lactic acid bacteria and the bacillus laterosporus are subjected to aerobic fermentation to decompose organic matters such as polysaccharide, amino acid and the like in the mixture, and the facultative yeast, the facultative lactic acid bacteria and the bacillus laterosporus secrete organic acid which can effectively passivate inorganic salt to form macromolecular groups to form precipitates which can be removed by filtration; with the consumption of oxygen in the fermentation bin and the insufficient supply of oxygen, facultative yeast and facultative lactic acid bacteria are converted into facultative fermentation, organic matters and inorganic salts in the mixture are continuously decomposed, and the metal content in the biogas slurry is further removed, so that five main heavy metals of arsenic, mercury, lead, chromium and cadmium in the organic nutrient solution prepared by the method can reach the national standard of organic fertilizers NY 525-2012;
(6) filtering impurities: and (4) placing the biogas slurry after the secondary fermentation in the step (5) into a filtering device to filter impurities, and obtaining the organic nutrient solution after filtering the impurities. In the embodiment, a filter screen is used for 100-mesh filtration, the content of water insoluble substances in the filtered organic nutrient solution is less than or equal to 5g/kg, the mass specific gravity of the organic nutrient solution is 1:1.35-1.45, the total nutrient content is greater than or equal to 120g/kg, the medium trace elements are greater than or equal to 2g/kg, the number of faecal escherichia coli groups is less than or equal to 100/g, the ascarid egg death rate is greater than or equal to 95%, the total arsenic content is less than or equal to 15mg/kg, the total mercury content is less than or equal to 2mg/kg, the total lead content is less than or equal to 50mg/kg, the total chromium content is less than or equal to 150mg/kg, and the total cadmium content is less than or equal to 3mg/kg, so that the national standard of.
Example two:
a method for preparing plant organic nutrient solution by secondary fermentation biogas slurry comprises the following steps:
(1) mixing livestock and poultry manure and crushed straws to obtain a manure straw mixture, blending the C/N in the manure straw mixture to be 25-30/1, adding water into the manure straw mixture to ensure that the water content in the manure straw mixture is 85-90%, placing the manure straw mixture after adding water into anaerobic fermentation equipment, and fermenting at the constant temperature of 37 ℃ for 26 days to obtain basic biogas slurry for later use; in the anaerobic fermentation process of the embodiment, the PH value of the biogas slurry needs to be measured, and is maintained between 7 and 7.5, so that the anaerobic fermentation process can be in a weakly alkaline fermentation state, the fermentation state is efficient and stable, and if the PH value of the biogas slurry is lower than 7.0 or higher than 8.0, the biogas slurry is neutralized in advance; in the anaerobic fermentation process, oxygen is isolated for fermentation, so that the fermentation chamber is in an anaerobic state, the propagation of fecal escherichia coli and the growth of roundworm eggs in livestock and poultry manure can be effectively inhibited, even the fecal escherichia coli and the roundworm eggs die due to oxygen deficiency, and thus the fecal escherichia coli and the roundworm eggs can be eliminated, and the death rate of the fecal escherichia coli and the roundworm eggs can reach the national standard of organic fertilizer NY 525-2012;
(2) solid-liquid separation: placing the fermented basic biogas slurry in the step (1) into solid-liquid separation equipment, and carrying out solid-liquid separation on the basic biogas slurry to obtain separated biogas residues and biogas slurry; in this embodiment, the content of water-insoluble matters in the separated biogas slurry is less than or equal to 5 g/l; the treatment mode adopted by the solid-liquid separation is centrifugal treatment, and heavy metals in part of the basic biogas slurry can be removed in the centrifugal treatment process, so that the content of the heavy metals in the basic biogas slurry is reduced;
(3) preparing nitrogen, phosphorus and potassium elements: placing the biogas slurry obtained in the step (2) into a fermentation bin, adding an organic matter containing N element, an organic matter containing K element and an inorganic matter containing P element into the biogas slurry in the fermentation bin, and controlling the content of N element in the biogas slurry to be 5.1% by mass, the content of P element to be 2.1% by mass and the content of K element to be 5.1% by mass; in this embodiment, the organic matter containing N element is rapeseed meal, 102kg of rapeseed meal is added to each ton of biogas slurry, the organic matter containing K element is plant ash, 105kg of plant ash is added to each ton of biogas slurry, the inorganic matter containing P element is bone calcium hydrogen phosphate, i.e. bone meal, and 41kg of bone calcium hydrogen phosphate is added to each ton of biogas slurry;
(4) and (3) blending amino acid content: adding free amino acid into the biogas slurry obtained in the step (3) to enable the content of the free amino acid in the biogas slurry to be 50g/kg of the mass percentage of the biogas slurry; in the embodiment, the biogas slurry is used as a basic raw material, and the free amino acid is added, so that on one hand, the slightly soluble elements in the mixture and the free amino acid can generate a chelation reaction, and the slightly soluble elements can generate a chelate which is good in solubility and easy to be absorbed by plants, so that the plant absorption is facilitated; on the other hand, when the plant is exposed to high temperature, low temperature and frost. Before and after the stress pressure of insect pests, hailstones and the like which influence the metabolism of plants, free amino acid can provide amino acid directly related to stress physiology for the plants after high-activity enzymolysis, so that the plant protection and recovery function is realized, and the temperature resistance, drought resistance, waterlogging resistance, insect pest resistance and other capabilities of the plants are improved; the free amino acid has better effects of promoting plant photosynthesis, promoting germination and stimulating root growth; the free amino acid can also promote the germination of plant pollen and the length growth of a pollen tube, and the fruit setting rate is improved; for the fruits of plants, the free amino acid has the functions of enhancing cell walls, prolonging the quality guarantee period and improving the mature period of the fruits;
(5) and (3) secondary facultative fermentation: adding a facultative fermentation bacterial agent and bacillus laterosporus into the biogas slurry obtained in the step (4) for secondary fermentation, wherein in the embodiment, the facultative fermentation bacterial agent comprises saccharomycetes, lactic acid bacteria and the like, and the total number of the saccharomycetes, the lactic acid bacteria, the bacillus laterosporus and the like is 1.2 multiplied by 1010cfu/g, wherein in the process of facultative fermentation, the pH value of the biogas slurry is maintained at 7.0-7.5, the temperature of the facultative fermentation is 29 ℃, and the time of the facultative fermentation is 11 days; when the oxygen is sufficient in the early stage, the facultative yeast, the facultative lactic acid bacteria and the bacillus laterosporus are subjected to aerobic fermentation to decompose organic matters such as polysaccharide, amino acid and the like in the mixture, and the facultative yeast, the facultative lactic acid bacteria and the bacillus laterosporus secrete organic acid which can effectively passivate inorganic salt to form macromolecular groups to form precipitates which can be removed by filtration; with the consumption of oxygen in the fermentation bin and the insufficient supply of oxygen, facultative yeast and facultative lactic acid bacteria are converted into facultative fermentation, organic matters and inorganic salts in the mixture are continuously decomposed, and the metal content in the biogas slurry is further removed, so that five main heavy metals of arsenic, mercury, lead, chromium and cadmium in the organic nutrient solution prepared by the method can reach the national standard of organic fertilizers NY 525-2012;
(6) filtering impurities: and (4) placing the biogas slurry after the secondary fermentation in the step (5) into a filtering device to filter impurities, and obtaining the organic nutrient solution after filtering the impurities. In the embodiment, a filter screen is used for 120-mesh filtration, the content of water insoluble substances in the filtered organic nutrient solution is less than or equal to 5g/kg, the mass specific gravity of the organic nutrient solution is 1:1.35-1.45, the total nutrient content is greater than or equal to 120g/kg, the medium trace elements are greater than or equal to 2g/kg, the number of faecal escherichia coli groups is less than or equal to 100/g, the ascarid egg death rate is greater than or equal to 95%, the total arsenic content is less than or equal to 15mg/kg, the total mercury content is less than or equal to 2mg/kg, the total lead content is less than or equal to 50mg/kg, the total chromium content is less than or equal to 150mg/kg, and the total cadmium content is less than or equal to 3mg/kg, so that the national standard of.
Example three:
a method for preparing plant organic nutrient solution by secondary fermentation biogas slurry comprises the following steps:
(1) mixing livestock and poultry manure and crushed straws to obtain a manure straw mixture, blending the C/N in the manure straw mixture to be 25-30/1, adding water into the manure straw mixture to ensure that the water content in the manure straw mixture is 85-90%, placing the manure straw mixture after adding water into anaerobic fermentation equipment, and fermenting at the constant temperature of 36.5 ℃ for 27 days to obtain basic biogas slurry for later use; in the anaerobic fermentation process of the embodiment, the PH value of the biogas slurry needs to be measured, and is maintained between 7 and 7.5, so that the anaerobic fermentation process can be in a weakly alkaline fermentation state, the fermentation state is efficient and stable, and if the PH value of the biogas slurry is lower than 7.0 or higher than 8.0, the biogas slurry is neutralized in advance; in the anaerobic fermentation process, oxygen is isolated for fermentation, so that the fermentation chamber is in an anaerobic state, the propagation of fecal escherichia coli and the growth of roundworm eggs in livestock and poultry manure can be effectively inhibited, even the fecal escherichia coli and the roundworm eggs die due to oxygen deficiency, and thus the fecal escherichia coli and the roundworm eggs can be eliminated, and the death rate of the fecal escherichia coli and the roundworm eggs can reach the national standard of organic fertilizer NY 525-2012;
(2) solid-liquid separation: placing the fermented basic biogas slurry in the step (1) into solid-liquid separation equipment, and carrying out solid-liquid separation on the basic biogas slurry to obtain separated biogas residues and biogas slurry; in this embodiment, the content of water-insoluble matters in the separated biogas slurry is less than or equal to 5 g/l; the treatment mode adopted by the solid-liquid separation is centrifugal treatment, and heavy metals in part of the basic biogas slurry can be removed in the centrifugal treatment process, so that the content of the heavy metals in the basic biogas slurry is reduced;
(3) preparing nitrogen, phosphorus and potassium elements: placing the biogas slurry obtained in the step (2) into a fermentation bin, adding an organic matter containing N element, an organic matter containing K element and an inorganic matter containing P element into the biogas slurry in the fermentation bin, and controlling the content of N element in the biogas slurry to be 5.2% by mass, the content of P element to be 2.2% by mass and the content of K element to be 5.2% by mass; in this embodiment, the organic matter containing N element is rapeseed meal, 104kg of rapeseed meal is added to each ton of biogas slurry, the organic matter containing K element is plant ash, 110kg of plant ash is added to each ton of biogas slurry, the inorganic matter containing P element is bone calcium hydrogen phosphate, i.e. bone meal, and 42kg of bone calcium hydrogen phosphate is added to each ton of biogas slurry;
(4) and (3) blending amino acid content: adding free amino acid into the biogas slurry obtained in the step (3) to enable the content of the free amino acid in the biogas slurry to be 50g/kg of the mass percentage of the biogas slurry; in the embodiment, the biogas slurry is used as a basic raw material, and the free amino acid is added, so that on one hand, the slightly soluble elements in the mixture and the free amino acid can generate a chelation reaction, and the slightly soluble elements can generate a chelate which is good in solubility and easy to be absorbed by plants, so that the plant absorption is facilitated; on the other hand, when the plant is exposed to high temperature, low temperature and frost. Before and after the stress pressure of insect pests, hailstones and the like which influence the metabolism of plants, free amino acid can provide amino acid directly related to stress physiology for the plants after high-activity enzymolysis, so that the plant protection and recovery function is realized, and the temperature resistance, drought resistance, waterlogging resistance, insect pest resistance and other capabilities of the plants are improved; the free amino acid has better effects of promoting plant photosynthesis, promoting germination and stimulating root growth; the free amino acid can also promote the germination of plant pollen and the length growth of a pollen tube, and the fruit setting rate is improved; for the fruits of plants, the free amino acid has the functions of enhancing cell walls, prolonging the quality guarantee period and improving the mature period of the fruits;
(5) and (3) secondary facultative fermentation: adding a facultative fermentation bacterial agent and bacillus laterosporus into the biogas slurry obtained in the step (4) for secondary fermentation, wherein in the embodiment, the facultative fermentation bacterial agent comprises saccharomycetes, lactic acid bacteria and the like, and the total bacterial number of the saccharomycetes, the lactic acid bacteria, the bacillus laterosporus and the like is 1.4 multiplied by 1010cfu/g, wherein in the process of facultative fermentation, the pH value of the biogas slurry is maintained at 7.0-7.5, the temperature of the facultative fermentation is 28 ℃, and the time of the facultative fermentation is 12 days; when the oxygen is sufficient in the early stage, the facultative yeast, the facultative lactic acid bacteria and the bacillus laterosporus are subjected to aerobic fermentation to decompose organic matters such as polysaccharide, amino acid and the like in the mixture, and the facultative yeast, the facultative lactic acid bacteria and the bacillus laterosporus secrete organic acid which can effectively passivate inorganic salt to form macromolecular groups to formPrecipitates, which can be removed by filtration; with the consumption of oxygen in the fermentation bin and the insufficient supply of oxygen, facultative yeast and facultative lactic acid bacteria are converted into facultative fermentation, organic matters and inorganic salts in the mixture are continuously decomposed, and the metal content in the biogas slurry is further removed, so that five main heavy metals of arsenic, mercury, lead, chromium and cadmium in the organic nutrient solution prepared by the method can reach the national standard of organic fertilizers NY 525-2012;
(6) filtering impurities: and (4) placing the biogas slurry after the secondary fermentation in the step (5) into a filtering device to filter impurities, and obtaining the organic nutrient solution after filtering the impurities. In the embodiment, a filter screen is used for filtering with 140 meshes, the content of water insoluble substances in the filtered organic nutrient solution is less than or equal to 5g/kg, the mass specific gravity of the organic nutrient solution is 1:1.35-1.45, the total nutrient content is greater than or equal to 120g/kg, the medium trace elements are greater than or equal to 2g/kg, the number of faecal escherichia coli groups is less than or equal to 100/g, the ascarid egg death rate is greater than or equal to 95%, the total arsenic content is less than or equal to 15mg/kg, the total mercury content is less than or equal to 2mg/kg, the total lead content is less than or equal to 50mg/kg, the total chromium content is less than or equal to 150mg/kg, and the total cadmium content is less than or equal to 3mg/kg, so that the national standard of.
Example four:
a method for preparing plant organic nutrient solution by secondary fermentation biogas slurry comprises the following steps:
(1) mixing livestock and poultry manure and crushed straws to obtain a manure straw mixture, blending the C/N in the manure straw mixture to be 25-30/1, adding water into the manure straw mixture to ensure that the water content in the manure straw mixture is 85-90%, placing the manure straw mixture after adding the water into anaerobic fermentation equipment, and fermenting at the constant temperature of 36 ℃ for 28 days to obtain basic biogas slurry for later use; in the anaerobic fermentation process of the embodiment, the PH value of the biogas slurry needs to be measured, and is maintained between 7 and 7.5, so that the anaerobic fermentation process can be in a weakly alkaline fermentation state, the fermentation state is efficient and stable, and if the PH value of the biogas slurry is lower than 7.0 or higher than 8.0, the biogas slurry is neutralized in advance; in the anaerobic fermentation process, oxygen is isolated for fermentation, so that the fermentation chamber is in an anaerobic state, the propagation of fecal escherichia coli and the growth of roundworm eggs in livestock and poultry manure can be effectively inhibited, even the fecal escherichia coli and the roundworm eggs die due to oxygen deficiency, and thus the fecal escherichia coli and the roundworm eggs can be eliminated, and the death rate of the fecal escherichia coli and the roundworm eggs can reach the national standard of organic fertilizer NY 525-2012;
(2) solid-liquid separation: placing the fermented basic biogas slurry in the step (1) into solid-liquid separation equipment, and carrying out solid-liquid separation on the basic biogas slurry to obtain separated biogas residues and biogas slurry; in this embodiment, the content of water-insoluble matters in the separated biogas slurry is less than or equal to 5 g/l; the treatment mode adopted by the solid-liquid separation is centrifugal treatment, and heavy metals in part of the basic biogas slurry can be removed in the centrifugal treatment process, so that the content of the heavy metals in the basic biogas slurry is reduced;
(3) preparing nitrogen, phosphorus and potassium elements: placing the biogas slurry obtained in the step (2) into a fermentation bin, adding an organic matter containing N element, an organic matter containing K element and an inorganic matter containing P element into the biogas slurry in the fermentation bin, and controlling the content of N element in the biogas slurry to be 5.3% by mass, the content of P element to be 2.3% by mass and the content of K element to be 5.3% by mass; in this embodiment, the organic matter containing N element is rapeseed meal, 106kg of rapeseed meal is added to each ton of biogas slurry, the organic matter containing K element is plant ash, 115kg of plant ash is added to each ton of biogas slurry, the inorganic matter containing P element is bone calcium hydrogen phosphate, i.e. bone meal, and 43kg of bone calcium hydrogen phosphate is added to each ton of biogas slurry;
(4) and (3) blending amino acid content: adding free amino acid into the biogas slurry obtained in the step (3) to enable the content of the free amino acid in the biogas slurry to be 50g/kg of the mass percentage of the biogas slurry; in the embodiment, the biogas slurry is used as a basic raw material, and the free amino acid is added, so that on one hand, the slightly soluble elements in the mixture and the free amino acid can generate a chelation reaction, and the slightly soluble elements can generate a chelate which is good in solubility and easy to be absorbed by plants, so that the plant absorption is facilitated; on the other hand, when the plant is exposed to high temperature, low temperature and frost. Before and after the stress pressure of insect pests, hailstones and the like which influence the metabolism of plants, free amino acid can provide amino acid directly related to stress physiology for the plants after high-activity enzymolysis, so that the plant protection and recovery function is realized, and the temperature resistance, drought resistance, waterlogging resistance, insect pest resistance and other capabilities of the plants are improved; the free amino acid has better effects of promoting plant photosynthesis, promoting germination and stimulating root growth; the free amino acid can also promote the germination of plant pollen and the length growth of a pollen tube, and the fruit setting rate is improved; for the fruits of plants, the free amino acid has the functions of enhancing cell walls, prolonging the quality guarantee period and improving the mature period of the fruits;
(5) and (3) secondary facultative fermentation: adding a facultative fermentation bacterial agent and bacillus laterosporus into the biogas slurry obtained in the step (4) for secondary fermentation, wherein in the embodiment, the facultative fermentation bacterial agent comprises saccharomycetes, lactic acid bacteria and the like, and the total bacterial number of the saccharomycetes, the lactic acid bacteria, the bacillus laterosporus and the like is 1.6 multiplied by 1010cfu/g, wherein in the process of facultative fermentation, the pH value of the biogas slurry is maintained at 7.0-7.5, the temperature of the facultative fermentation is 27 ℃, and the time of the facultative fermentation is 13 days; when the oxygen is sufficient in the early stage, the facultative yeast, the facultative lactic acid bacteria and the bacillus laterosporus are subjected to aerobic fermentation to decompose organic matters such as polysaccharide, amino acid and the like in the mixture, and the facultative yeast, the facultative lactic acid bacteria and the bacillus laterosporus secrete organic acid which can effectively passivate inorganic salt to form macromolecular groups to form precipitates which can be removed by filtration; with the consumption of oxygen in the fermentation bin and the insufficient supply of oxygen, facultative yeast and facultative lactic acid bacteria are converted into facultative fermentation, organic matters and inorganic salts in the mixture are continuously decomposed, and the metal content in the biogas slurry is further removed, so that five main heavy metals of arsenic, mercury, lead, chromium and cadmium in the organic nutrient solution prepared by the method can reach the national standard of organic fertilizers NY 525-2012;
(6) filtering impurities: and (4) placing the biogas slurry after the secondary fermentation in the step (5) into a filtering device to filter impurities, and obtaining the organic nutrient solution after filtering the impurities. In the embodiment, a filter screen is used for filtering with 160 meshes, the content of water insoluble matters in the filtered organic nutrient solution is less than or equal to 5g/kg, the mass specific gravity of the organic nutrient solution is 1:1.35-1.45, the total nutrient content is more than or equal to 120g/kg, the medium trace elements are more than or equal to 2g/kg, the number of faecal escherichia coli groups is less than or equal to 100/g, the ascarid egg death rate is more than or equal to 95%, the total arsenic content is less than or equal to 15mg/kg, the total mercury content is less than or equal to 2mg/kg, the total lead content is less than or equal to 50mg/kg, the total chromium content is less than or equal to 150mg/kg, and the total cadmium content is less than or equal to 3mg/kg, so that the national standard of.
Example five:
a method for preparing plant organic nutrient solution by secondary fermentation biogas slurry comprises the following steps:
(1) mixing livestock and poultry manure and crushed straws to obtain a manure straw mixture, blending the C/N in the manure straw mixture to be 25-30/1, adding water into the manure straw mixture to ensure that the water content in the manure straw mixture is 85-90%, placing the manure straw mixture after adding water into anaerobic fermentation equipment, and fermenting at the constant temperature of 35.5 ℃ for 29 days to obtain basic biogas slurry for later use; in the anaerobic fermentation process of the embodiment, the PH value of the biogas slurry needs to be measured, and is maintained between 7 and 7.5, so that the anaerobic fermentation process can be in a weakly alkaline fermentation state, the fermentation state is efficient and stable, and if the PH value of the biogas slurry is lower than 7.0 or higher than 8.0, the biogas slurry is neutralized in advance; in the anaerobic fermentation process, oxygen is isolated for fermentation, so that the fermentation chamber is in an anaerobic state, the propagation of fecal escherichia coli and the growth of roundworm eggs in livestock and poultry manure can be effectively inhibited, even the fecal escherichia coli and the roundworm eggs die due to oxygen deficiency, and thus the fecal escherichia coli and the roundworm eggs can be eliminated, and the death rate of the fecal escherichia coli and the roundworm eggs can reach the national standard of organic fertilizer NY 525-2012;
(2) solid-liquid separation: placing the fermented basic biogas slurry in the step (1) into solid-liquid separation equipment, and carrying out solid-liquid separation on the basic biogas slurry to obtain separated biogas residues and biogas slurry; in this embodiment, the content of water-insoluble matters in the separated biogas slurry is less than or equal to 5 g/l; the treatment mode adopted by the solid-liquid separation is centrifugal treatment, and heavy metals in part of the basic biogas slurry can be removed in the centrifugal treatment process, so that the content of the heavy metals in the basic biogas slurry is reduced;
(3) preparing nitrogen, phosphorus and potassium elements: placing the biogas slurry obtained in the step (2) into a fermentation bin, adding an organic matter containing N element, an organic matter containing K element and an inorganic matter containing P element into the biogas slurry in the fermentation bin, and controlling the content of N element in the biogas slurry to be 5.4% by mass, the content of P element to be 2.4% by mass and the content of K element to be 5.4% by mass; in this embodiment, the organic matter containing N element is rapeseed meal, 108kg of rapeseed meal is added to each ton of biogas slurry, the organic matter containing K element is plant ash, 120kg of plant ash is added to each ton of biogas slurry, the inorganic matter containing P element is bone calcium hydrogen phosphate, i.e. bone meal, and 44kg of bone calcium hydrogen phosphate is added to each ton of biogas slurry;
(4) and (3) blending amino acid content: adding free amino acid into the biogas slurry obtained in the step (3) to enable the content of the free amino acid in the biogas slurry to be 50g/kg of the mass percentage of the biogas slurry; in the embodiment, the biogas slurry is used as a basic raw material, and the free amino acid is added, so that on one hand, the slightly soluble elements in the mixture and the free amino acid can generate a chelation reaction, and the slightly soluble elements can generate a chelate which is good in solubility and easy to be absorbed by plants, so that the plant absorption is facilitated; on the other hand, when the plant is exposed to high temperature, low temperature and frost. Before and after the stress pressure of insect pests, hailstones and the like which influence the metabolism of plants, free amino acid can provide amino acid directly related to stress physiology for the plants after high-activity enzymolysis, so that the plant protection and recovery function is realized, and the temperature resistance, drought resistance, waterlogging resistance, insect pest resistance and other capabilities of the plants are improved; the free amino acid has better effects of promoting plant photosynthesis, promoting germination and stimulating root growth; the free amino acid can also promote the germination of plant pollen and the length growth of a pollen tube, and the fruit setting rate is improved; for the fruits of plants, the free amino acid has the functions of enhancing cell walls, prolonging the quality guarantee period and improving the mature period of the fruits;
(5) and (3) secondary facultative fermentation: adding facultative fermentation into the biogas slurry obtained in the step (4)The microbial inoculum and the bacillus laterosporus are subjected to secondary fermentation, in the embodiment, the facultative aerofermentation microbial inoculum comprises saccharomycetes, lactic acid bacteria and the like, and the total bacterial count of the saccharomycetes, the lactic acid bacteria, the bacillus laterosporus and the like is 1.8 multiplied by 1010cfu/g, wherein in the process of facultative fermentation, the pH value of the biogas slurry is maintained at 7.0-7.5, the temperature of the facultative fermentation is 26 ℃, and the time of the facultative fermentation is 14 days; when the oxygen is sufficient in the early stage, the facultative yeast, the facultative lactic acid bacteria and the bacillus laterosporus are subjected to aerobic fermentation to decompose organic matters such as polysaccharide, amino acid and the like in the mixture, and the facultative yeast, the facultative lactic acid bacteria and the bacillus laterosporus secrete organic acid which can effectively passivate inorganic salt to form macromolecular groups to form precipitates which can be removed by filtration; with the consumption of oxygen in the fermentation bin and the insufficient supply of oxygen, facultative yeast and facultative lactic acid bacteria are converted into facultative fermentation, organic matters and inorganic salts in the mixture are continuously decomposed, and the metal content in the biogas slurry is further removed, so that five main heavy metals of arsenic, mercury, lead, chromium and cadmium in the organic nutrient solution prepared by the method can reach the national standard of organic fertilizers NY 525-2012;
(6) filtering impurities: and (4) placing the biogas slurry after the secondary fermentation in the step (5) into a filtering device to filter impurities, and obtaining the organic nutrient solution after filtering the impurities. In the embodiment, a filter screen is used for 180-mesh filtration, the content of water insoluble substances in the filtered organic nutrient solution is less than or equal to 5g/kg, the mass specific gravity of the organic nutrient solution is 1:1.35-1.45, the total nutrient content is greater than or equal to 120g/kg, the medium trace elements are greater than or equal to 2g/kg, the number of faecal escherichia coli groups is less than or equal to 100/g, the ascarid egg death rate is greater than or equal to 95%, the total arsenic content is less than or equal to 15mg/kg, the total mercury content is less than or equal to 2mg/kg, the total lead content is less than or equal to 50mg/kg, the total chromium content is less than or equal to 150mg/kg, and the total cadmium content is less than or equal to 3mg/kg, so that the national standard of.
Example six:
a method for preparing plant organic nutrient solution by secondary fermentation biogas slurry comprises the following steps:
(1) mixing livestock and poultry manure and crushed straws to obtain a manure straw mixture, blending the C/N in the manure straw mixture to be 25-30/1, adding water into the manure straw mixture to ensure that the water content in the manure straw mixture is 85-90%, placing the manure straw mixture after adding water into anaerobic fermentation equipment, and fermenting at the constant temperature of 35 ℃ for 30 days to obtain basic biogas slurry for later use; in the anaerobic fermentation process of the embodiment, the PH value of the biogas slurry needs to be measured, and is maintained between 7 and 7.5, so that the anaerobic fermentation process can be in a weakly alkaline fermentation state, the fermentation state is efficient and stable, and if the PH value of the biogas slurry is lower than 7.0 or higher than 8.0, the biogas slurry is neutralized in advance; in the anaerobic fermentation process, oxygen is isolated for fermentation, so that the fermentation chamber is in an anaerobic state, the propagation of fecal escherichia coli and the growth of roundworm eggs in livestock and poultry manure can be effectively inhibited, even the fecal escherichia coli and the roundworm eggs die due to oxygen deficiency, and thus the fecal escherichia coli and the roundworm eggs can be eliminated, and the death rate of the fecal escherichia coli and the roundworm eggs can reach the national standard of organic fertilizer NY 525-2012;
(2) solid-liquid separation: placing the fermented basic biogas slurry in the step (1) into solid-liquid separation equipment, and carrying out solid-liquid separation on the basic biogas slurry to obtain separated biogas residues and biogas slurry; in this embodiment, the content of water-insoluble matters in the separated biogas slurry is less than or equal to 5 g/l; the treatment mode adopted by the solid-liquid separation is centrifugal treatment, and heavy metals in part of the basic biogas slurry can be removed in the centrifugal treatment process, so that the content of the heavy metals in the basic biogas slurry is reduced;
(3) preparing nitrogen, phosphorus and potassium elements: placing the biogas slurry obtained in the step (2) into a fermentation bin, adding an organic matter containing N element, an organic matter containing K element and an inorganic matter containing P element into the biogas slurry in the fermentation bin, and controlling the content of N element in the biogas slurry to be 5.5% by mass, the content of P element to be 2.5% by mass and the content of K element to be 5.5% by mass; in this embodiment, the organic matter containing N element is rapeseed meal, 110kg of rapeseed meal is added to each ton of biogas slurry, the organic matter containing K element is plant ash, 125kg of plant ash is added to each ton of biogas slurry, the inorganic matter containing P element is bone calcium hydrogen phosphate, i.e. bone meal, and 45kg of bone calcium hydrogen phosphate is added to each ton of biogas slurry;
(4) and (3) blending amino acid content: adding free amino acid into the biogas slurry obtained in the step (3) to enable the content of the free amino acid in the biogas slurry to be 50g/kg of the mass percentage of the biogas slurry; in the embodiment, the biogas slurry is used as a basic raw material, and the free amino acid is added, so that on one hand, the slightly soluble elements in the mixture and the free amino acid can generate a chelation reaction, and the slightly soluble elements can generate a chelate which is good in solubility and easy to be absorbed by plants, so that the plant absorption is facilitated; on the other hand, when the plant is exposed to high temperature, low temperature and frost. Before and after the stress pressure of insect pests, hailstones and the like which influence the metabolism of plants, free amino acid can provide amino acid directly related to stress physiology for the plants after high-activity enzymolysis, so that the plant protection and recovery function is realized, and the temperature resistance, drought resistance, waterlogging resistance, insect pest resistance and other capabilities of the plants are improved; the free amino acid has better effects of promoting plant photosynthesis, promoting germination and stimulating root growth; the free amino acid can also promote the germination of plant pollen and the length growth of a pollen tube, and the fruit setting rate is improved; for the fruits of plants, the free amino acid has the functions of enhancing cell walls, prolonging the quality guarantee period and improving the mature period of the fruits;
(5) and (3) secondary facultative fermentation: adding a facultative fermentation bacterial agent and bacillus laterosporus into the biogas slurry obtained in the step (4) for secondary fermentation, wherein in the embodiment, the facultative fermentation bacterial agent comprises saccharomycetes, lactic acid bacteria and the like, and the total bacterial number of the saccharomycetes, the lactic acid bacteria, the bacillus laterosporus and the like is 1.8 multiplied by 1010cfu/g, wherein in the process of facultative fermentation, the pH value of the biogas slurry is maintained at 7.0-7.5, the temperature of the facultative fermentation is 25 ℃, and the time of the facultative fermentation is 15 days; when the oxygen is sufficient in the early stage, the facultative yeast, the facultative lactic acid bacteria and the bacillus laterosporus are subjected to aerobic fermentation to decompose organic matters such as polysaccharide, amino acid and the like in the mixture, and the facultative yeast, the facultative lactic acid bacteria and the bacillus laterosporus secrete organic acid which can effectively passivate inorganic salt to form macromolecular groups to form precipitates which can be removed by filtration; oxygen supply with oxygen consumption in the fermentation chamberWhen the organic nutrient solution is insufficient, the facultative saccharomycetes and the facultative lactic acid bacteria are converted into facultative fermentation, organic matters and inorganic salts in the mixture are continuously decomposed, and the metal content in the biogas slurry is further removed, so that five main heavy metals of arsenic, mercury, lead, chromium and cadmium in the organic nutrient solution prepared by the method can reach the national standard of organic fertilizers NY 525-2012;
(6) filtering impurities: and (4) placing the biogas slurry after the secondary fermentation in the step (5) into a filtering device to filter impurities, and obtaining the organic nutrient solution after filtering the impurities. In the embodiment, a filter screen is used for filtering with 200 meshes, the content of water insoluble substances in the filtered organic nutrient solution is less than or equal to 5g/kg, the mass specific gravity of the organic nutrient solution is 1:1.35-1.45, the total nutrient content is greater than or equal to 120g/kg, the medium trace elements are greater than or equal to 2g/kg, the number of faecal escherichia coli groups is less than or equal to 100/g, the ascarid egg death rate is greater than or equal to 95%, the total arsenic content is less than or equal to 15mg/kg, the total mercury content is less than or equal to 2mg/kg, the total lead content is less than or equal to 50mg/kg, the total chromium content is less than or equal to 150mg/kg, and the total cadmium content is less than or equal to 3mg/kg, so that the national standard of.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those of ordinary skill in the art can readily practice the present invention as described herein; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.

Claims (9)

1. A method for preparing plant organic nutrient solution by secondary fermentation biogas slurry is characterized in that: the method comprises the following steps:
(1) preparing basic biogas slurry: mixing livestock and poultry manure and crushed straws to obtain a manure straw mixture, blending the C/N in the manure straw mixture to be 25-30/1, adding water into the manure straw mixture to ensure that the water content in the manure straw mixture is 85-90%, placing the manure straw mixture after adding water into anaerobic fermentation equipment, and fermenting at the constant temperature of 35.5-37.5 ℃ for 25-30 days to obtain basic biogas slurry for later use;
(2) solid-liquid separation: placing the fermented basic biogas slurry into solid-liquid separation equipment, and carrying out solid-liquid separation on the basic biogas slurry to obtain separated biogas residues and biogas slurry;
(3) preparing nitrogen, phosphorus and potassium elements: adding organic matters containing N elements and K elements and inorganic matters containing P elements into the separated biogas slurry, so that the content of the N elements in the biogas slurry accounts for 5-5.5% by mass of the biogas slurry, the content of the P elements accounts for 2-2.5% by mass of the biogas slurry, and the content of the K elements accounts for 5-5.5% by mass of the biogas slurry;
(4) and (3) blending amino acid content: adding amino acid into the biogas slurry obtained after adding the nitrogen, phosphorus and potassium elements to ensure that the content of the amino acid in the biogas slurry is more than or equal to 50-100 g/kg;
(5) and (3) secondary facultative fermentation: adding a microbial inoculum into the biogas slurry obtained after the amino acid is added for secondary fermentation, keeping the temperature at 25-30 ℃, and standing for 10-15 days;
(6) filtering impurities: and (3) placing the biogas slurry after the secondary fermentation into a filtering device to filter impurities, and filtering the impurities in the biogas slurry to obtain the organic nutrient solution.
2. The method for preparing the plant organic nutrient solution through secondary fermentation biogas slurry according to claim 1, characterized in that: in the solid-liquid separation step, the content of water insoluble matters in the biogas slurry after the solid-liquid separation is less than or equal to 5 g/L.
3. The method for preparing the plant organic nutrient solution through secondary fermentation biogas slurry as claimed in claim 2, wherein the method comprises the following steps: in the step of preparing the nitrogen, phosphorus and potassium elements, the organic matter containing the N element adopts one or two of bean pulp and rapeseed pulp to be mixed.
4. The method for preparing the plant organic nutrient solution through secondary fermentation biogas slurry according to claim 3, characterized in that: in the step of preparing nitrogen, phosphorus and potassium elements, the organic matter containing the K element is plant ash.
5. The method for preparing the plant organic nutrient solution through secondary fermentation biogas slurry according to claim 4, characterized in that: in the step of preparing nitrogen, phosphorus and potassium elements, the inorganic substance containing the P element is bone calcium hydrophosphate.
6. The method for preparing the plant organic nutrient solution through secondary fermentation biogas slurry according to claim 5, characterized in that: in the step of formulating the amino acid content, the amino acid is a free amino acid.
7. The method for preparing the plant organic nutrient solution through secondary fermentation biogas slurry according to claim 6, characterized in that: in the secondary facultative fermentation step, the microbial inoculum adopts facultative fermentation microbial inoculum and bacillus laterosporus.
8. The method for preparing the plant organic nutrient solution through secondary fermentation biogas slurry according to claim 7, characterized in that: in the impurity filtering step, the filtering equipment adopts a filtering net with 100-200 meshes for filtering.
9. The method for preparing the plant organic nutrient solution through secondary fermentation biogas slurry according to claim 8, characterized in that: in the step of filtering impurities, the total nutrient content in the organic nutrient solution is more than or equal to 120g/kg, the medium and trace elements are more than or equal to 2g/kg, the number of faecal escherichia coli groups is less than or equal to 100/g, the ascarid egg death rate is more than or equal to 95%, the total arsenic content is less than or equal to 15mg/kg, the total mercury content is less than or equal to 2mg/kg, the total lead content is less than or equal to 50mg/kg, the total chromium content is less than or equal to 150mg/kg, the total cadmium content is less than or equal to 3mg/kg, the water-insoluble substances in the organic nutrient solution are less than or equal to 5g/kg, and the mass specific gravity is 1: 1.3.
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CN109180372A (en) * 2018-11-26 2019-01-11 甘肃方正节能科技服务有限公司 Biogas slurry amino acid fertilizer and preparation method thereof
CN110171994A (en) * 2019-06-14 2019-08-27 余宗波 Odorless high-valued biogas slurry fertilizer of one kind and preparation method thereof

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CN101606471A (en) * 2009-07-23 2009-12-23 安徽省丰田无籽西瓜技术有限公司 Seedling medium and preparation method that a kind of vinasse methane-sludge makes
CN109180372A (en) * 2018-11-26 2019-01-11 甘肃方正节能科技服务有限公司 Biogas slurry amino acid fertilizer and preparation method thereof
CN110171994A (en) * 2019-06-14 2019-08-27 余宗波 Odorless high-valued biogas slurry fertilizer of one kind and preparation method thereof

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Application publication date: 20201120