CN114180995A - Production and application method of semi-solid fermented biogas manure in large-scale pig farm - Google Patents
Production and application method of semi-solid fermented biogas manure in large-scale pig farm Download PDFInfo
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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
- C05F3/00—Fertilisers from human or animal excrements, e.g. manure
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C21/00—Methods of fertilising, sowing or planting
- A01C21/005—Following a specific plan, e.g. pattern
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C21/00—Methods of fertilising, sowing or planting
- A01C21/007—Determining fertilization requirements
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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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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- 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
- C05F3/06—Apparatus for the manufacture
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/18—Semi-solid fertilisers, e.g. foams or gels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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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Abstract
The invention discloses a method for producing and applying semi-solid fermented biogas manure in a large-scale pig farm, belonging to the technical field of manure treatment and comprising the following steps: A. collecting excrement and adjusting feeding through an excrement and sewage collecting system and an adjusting tank; B. performing two-stage anaerobic fermentation on the regulated excrement; C. mixing the manure after the two-stage anaerobic fermentation with biogas slurry and biogas residues to obtain semi-solid fermented biogas manure; D. the biogas slurry is refluxed and circulated to the adjusting tank; E. the biogas manure is stored, distributed and applied, the problems of high pollutant concentration, low resource utilization rate, low deep treatment, high investment and high operating cost after treatment in the traditional technology are solved, and the technical effects of improving the resource utilization rate and reducing the concentration of the manure pollutants, the investment and the operating cost are realized.
Description
Technical Field
The invention belongs to the technical field of fecal sewage treatment, and particularly relates to a production and application method of a large-scale pig farm fecal sewage semi-solid state fermentation biogas manure.
Background
In recent years, with the improvement of the living standard of people, the demand of poultry meat products is continuously increased, the rapid development of livestock and poultry breeding is promoted, but a large amount of excrement and urine and breeding wastewater discharged under an intensive and large-scale breeding mode become emerging pollution sources in many cities and rural areas. According to the measurement and calculation, the feces and urine yield of 1 pig per year is about 2.5t, the slaughter quantity of domestic pigs in 2018 is about 6.94 hundred million, the feces discharge total quantity of the live pigs is 27621 kilo t, and the urine discharge total quantity is 45575.5 kilo t. If the livestock wastewater of a large pig farm is directly discharged without treatment, various complex nutrient substances in the excrement directly enter peripheral water bodies, and the water bodies are seriously eutrophicated; dust, microorganisms and the like in the excrement accompanied by pungent odor are scattered in the air of a farm and the periphery, so that respiratory diseases of a human body are easily generated and spread; heavy metals, antibiotics, veterinary drugs, hormones and other substances remained in the excrement can be directly applied to farmlands, so that the soil properties can be influenced and destroyed, and the quality and the yield of crops can be reduced; if various pathogens contained in the excrement are randomly piled around a farm without harmless treatment, epidemic diseases can be generated and spread, the body resistance of livestock and poultry is reduced, the morbidity and mortality of the livestock and poultry are increased, and the production performance of offspring and the breeding of fine varieties are even affected.
At present, domestic and foreign treatment modes for the livestock and poultry manure mainly comprise two modes of resource utilization and standard discharge treatment.
Resource utilization mainly has two modes: the first is biogas engineering, the solid-liquid separation is carried out on the livestock and poultry manure, the solid manure is used for producing fertilizer, and the liquid dung is used for producing biogas through fermentation; the other is ecological cycle application, solid excrement is used for preparing organic fertilizer and is applied to pasture, vegetables, crops and the like, liquid excrement water is subjected to anaerobic treatment, the obtained purified water can be used for a secondary use by a farm, and the generated biogas slurry, biogas slurry and biogas can be respectively used for preparing the organic fertilizer, fuel in the farm and the like, so that the purpose of zero excrement discharge of the farm is achieved. However, at present, domestic livestock and poultry farms have the problems of backward management mode, inadequate deep treatment, great influence by seasonal irrigation, high concentration of pollutants after treatment and the like, and most livestock and poultry farms are difficult to realize zero discharge of the cultured excrement.
The standard-reaching discharge after the treatment is taken as another important mode of the livestock and poultry manure treatment, the livestock and poultry manure can be discharged after reaching the standard mainly through the treatment of facility links such as a grating pool, a hydrolysis pool, an activated sludge pool, a sedimentation pool, a disinfection pool and the like, but the method is not suitable for most of aquaculture in a micro-profit operation due to large investment and high operating cost.
Based on the problems in the domestic large-scale farm excrement treatment, the large-scale farm is developed, and an efficient method for efficiently utilizing culture materials and energy is urgently needed, so that a large amount of excrement generated by the farm can be solved, and the resource utilization of the excrement can be fully realized.
Disclosure of Invention
Aiming at the problems of high pollutant concentration, low resource utilization rate, low deep treatment, high investment and high operating cost after treatment in the prior art, the invention provides a method for producing and applying semi-solid fermented biogas manure in a large-scale pig farm, which aims to: improving the resource utilization rate and reducing the concentration of the feces pollutants and the investment and operation cost.
The technical scheme adopted by the invention is as follows:
a method for producing and applying semi-solid fermented biogas manure from manure in large-scale pig farms is used for preparing the semi-solid fermented biogas manure by a two-stage fermentation and mixing process.
By adopting the scheme, the semi-solid state fermented biogas manure at the preparation part avoids the pollution of the excrement to the ecological environment, simultaneously generates biogas in the fermentation process, realizes the high-efficiency utilization of energy, and finally, the prepared semi-solid state biogas manure is applied as an organic fertilizer, realizes the resource utilization of nutrient substances in the excrement, creates economic efficiency while protecting the environment, and provides possibility for realizing the resource utilization of the excrement in the aquaculture industry beneficial to the micro-operation.
The method specifically comprises the following steps:
A. collecting excrement and adjusting feeding through an excrement and sewage collecting system and an adjusting tank;
B. performing two-stage anaerobic fermentation on the adjusted excrement to obtain methane and fermented excrement;
C. mixing the manure after the two-stage anaerobic fermentation with biogas slurry and biogas residues to obtain semi-solid fermented biogas manure;
D. the biogas slurry is refluxed and circulated to the adjusting tank;
E. and (4) storing, distributing and applying the biogas manure.
By adopting the scheme, the feces collection system is manually cleaned, and is washed by clean water, the feces collection system flows into the regulating tank through a pipeline and is mixed with the backflow biogas manure, the regulated feces enters the upflow anaerobic solid reactor to be subjected to one-side anaerobic fermentation, and then enters the complete mixing type anaerobic reactor to be subjected to secondary anaerobic fermentation, the biogas slurry flows back to the regulating tank, a large amount of microorganisms are carried out on the regulating tank, the anaerobic fermentation efficiency is obviously improved, the concentration regulation effect can also be realized on feeding materials, and the semi-solid state fermentation biogas manure is formed by mixing the biogas slurry and the biogas residues after two-stage fermentation in the step C, so that the pollution of the feces to the ecological environment is avoided.
And step A is carried out through a feces collection system and an adjusting tank, so that the feeding concentration is controlled to be about 6%.
And C, continuously flowing the biogas slurry in the step C, intermittently entering the biogas residues, and controlling the solid-to-liquid ratio of the semi-solid biogas fertilizer to be 1:9-1: 4.
The pH value of the semi-solid fermented biogas fertilizer obtained in the step C is 6.5-7.5, the organic matter content is 500g/kg, the nitrogen content is 7.52-13.97g/kg, the phosphorus content is 9.58-17.79g/kg, and the potassium content is 3.5-5.0 g/kg.
And C, when the pH value of the semi-solid fermented biogas fertilizer in the step C is less than 6, adjusting the pH value of the biogas fertilizer to 7.5-8.5 by using sodium bicarbonate.
By adopting the scheme, when the pH value in the adjusting and mixing tank is kept between 7.5 and 8.5, the biogas slurry for reflux circulation can maintain alkalescence, and the purpose of keeping the alkalescence is as follows: eliminating the influence of acid accumulation in the anaerobic fermentation process; a great deal of research shows that the acid accumulation phenomenon exists in the manure anaerobic fermentation process, the pH value of the manure gradually decreases along with the operation of an anaerobic fermentation system, when the pH value decreases to below 4, the anaerobic fermentation efficiency obviously decreases, and the methane production also obviously decreases. Aiming at the problem of acid accumulation, the pH value of the excrement entering the mixing tank is required to be adjusted to 7.5-8.5 in time when the pH value of the excrement is reduced to be below 6, and the biogas manure after pH adjustment enters the adjusting tank through backflow circulation to improve the pH value of feeding materials, so that the pH value of the excrement in the anaerobic fermentation process is adjusted, and the influence caused by acid accumulation is eliminated.
And D, refluxing and circulating the biogas slurry in the mixing tank to the adjusting tank through a biogas slurry reflux system in the step D, wherein the biogas slurry reflux proportion is 40-50%.
The specific steps of the step E are as follows:
e1 conveying the semi-solid fermented biogas manure to a land requiring fertilization in a tank car and pipeline mode;
e2, for the non-fertilization season, conveying the biogas manure to a field biogas manure storage pool, and distributing the biogas manure from the storage pool when the crops need to be fertilized;
e3 calculating the application amount of the semi-solid state fermentation biogas fertilizer as the base fertilizer on the fruit trees, the grain crops and the vegetable plots according to the soil fertilizer supply capacity, the land bearing capacity and the biogas fertilizer fertility index.
E4 performing matching application of the semi-solid fermented biogas manure according to the obtained application amount
By adopting the scheme, the contradiction between seasonal water and fertilizer demand of crops and continuous manure discharge of a pig farm is effectively solved, matched application to the field is realized, matched application to various crops is realized, and the phenomena of environmental pollution or insufficient fertility and the like caused by mismatching of the application amount of the biogas manure with the bearing capacity of the soil and the fertility of the soil are avoided.
The specific method of the step E4 is as follows: the application method of the semi-solid state fermentation biogas manure as a base fertilizer on fruit trees, grain crops and vegetable plots respectively adopts mechanical furrow application, mechanical injection and mechanical spraying.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the prepared semi-solid fermented biogas manure avoids pollution of manure to the ecological environment, simultaneously generates biogas in the fermentation process, realizes high-efficiency utilization of energy, is applied as an organic fertilizer, realizes resource utilization of nutrient substances in the manure, protects the environment, creates economic efficiency, and provides possibility for realizing the resource utilization of the manure for the aquaculture industry which is slightly beneficial to management.
2. Wherein the excrement collecting system is artificially cleaned excrement, then washed by clear water, flows into the regulating reservoir through a pipeline, is mixed with the returned biogas manure, the regulated excrement enters the upflow anaerobic solid reactor for primary anaerobic fermentation, and then enters the complete mixing type anaerobic reactor for secondary anaerobic fermentation, the biogas slurry flows back to the regulating reservoir, not only a large amount of microorganisms are carried to the regulating reservoir, the anaerobic fermentation efficiency is obviously improved, but also the concentration regulation effect on feeding is achieved, wherein the semi-solid state fermentation biogas manure is formed by mixing the biogas slurry and the biogas residues after two-stage fermentation in the step C, and the pollution of the excrement to the ecological environment is avoided
3. When the pH value in the adjusting and mixing tank is kept between 7.5 and 8.5, the biogas slurry for reflux circulation can maintain alkalescence, and the purpose of keeping the alkalescence is as follows: eliminating the influence of acid accumulation in the anaerobic fermentation process; a great deal of research shows that the acid accumulation phenomenon exists in the manure anaerobic fermentation process, the pH value of the manure gradually decreases along with the operation of an anaerobic fermentation system, when the pH value decreases to below 4, the anaerobic fermentation efficiency obviously decreases, and the methane production also obviously decreases. Aiming at the problem of acid accumulation, the pH value of the excrement entering the mixing tank is required to be adjusted to 7.5-8.5 in time when the pH value of the excrement is reduced to be below 6, and the biogas manure after pH adjustment enters the adjusting tank through backflow circulation to improve the pH value of feeding materials, so that the pH value of the excrement in the anaerobic fermentation process is adjusted, and the influence caused by acid accumulation is eliminated.
4. The method effectively solves the contradiction between seasonal water and fertilizer demand of crops and continuous manure discharge of pig farms, realizes matched application of the fields, realizes matched application of various crops, and avoids the phenomena of environmental pollution or insufficient fertility and the like caused by mismatching of the application amount of biogas manure with the bearing capacity of soil and the fertility of soil.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a flow diagram of one embodiment of the present invention;
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
The present invention will be described in detail with reference to fig. 1.
The first embodiment is as follows:
a method for producing and applying semi-solid fermented biogas manure from manure in large-scale pig farms is used for preparing the semi-solid fermented biogas manure by a two-stage fermentation and mixing process.
The method specifically comprises the following steps:
A. collecting excrement and adjusting feeding through an excrement and sewage collecting system and an adjusting tank;
B. performing two-stage anaerobic fermentation on the regulated excrement;
C. mixing the manure after the two-stage anaerobic fermentation with biogas slurry and biogas residues to obtain semi-solid fermented biogas manure;
D. the biogas slurry is refluxed and circulated to the adjusting tank;
E. and (4) storing, distributing and applying the biogas manure.
And step A is carried out through a feces collection system and an adjusting tank, so that the feeding concentration is controlled to be about 6%.
And C, continuously flowing the biogas slurry in the step C, intermittently entering the biogas residues, and controlling the solid-to-liquid ratio of the semi-solid biogas fertilizer to be 1:9-1: 4.
The pH value of the semi-solid fermented biogas fertilizer obtained in the step C is 6.5-7.5, the organic matter content is 500g/kg, the nitrogen content is 7.52-13.97g/kg, the phosphorus content is 9.58-17.79g/kg, and the potassium content is 3.5-5.0 g/kg.
And C, when the pH value of the semi-solid fermented biogas fertilizer in the step C is less than 6, adjusting the pH value of the biogas fertilizer to 7.5-8.5 by using sodium bicarbonate.
And D, refluxing and circulating the biogas slurry in the mixing tank to the adjusting tank through a biogas slurry reflux system in the step D, wherein the biogas slurry reflux proportion is 40-50%.
The specific steps of the step E are as follows:
e1 conveying the semi-solid fermented biogas manure to a land requiring fertilization in a tank car and pipeline mode;
e2, for the non-fertilization season, conveying the biogas manure to a field biogas manure storage pool, and distributing the biogas manure from the storage pool when the crops need to be fertilized;
e3 calculating the application amount of the semi-solid state fermentation biogas fertilizer as the base fertilizer on the fruit trees, the grain crops and the vegetable plots according to the soil fertilizer supply capacity, the land bearing capacity and the biogas fertilizer fertility index.
E4 performing matching application of the semi-solid fermented biogas manure according to the obtained application amount
The specific method of the step E4 is as follows: the application method of the semi-solid state fermentation biogas manure as a base fertilizer on fruit trees, grain crops and vegetable plots respectively adopts mechanical furrow application, mechanical injection and mechanical spraying.
The specific mode of the feces collection system is that feces are cleaned manually, washed by clean water, flowed into a regulating tank through a pipeline, and mixed with backflow biogas slurry, the feeding concentration of the feces collection system needs to be kept about 6%, after mixing, the feces enter an up-flow anaerobic solid reaction and perform primary anaerobic fermentation, and then enter a complete mixing type anaerobic reactor to perform secondary anaerobic fermentation; the feed is fermented at medium temperature in a primary anaerobic reactor, the temperature is controlled at 35 ℃, and the retention time is 15-20 days; after the first fermentation, the manure enters a fully mixed anaerobic fermentation tank for secondary fermentation, the fermentation temperature is controlled at 35 ℃, and the manure stays for 10-15 days;
after the feces are fermented for the second time, the fermentation product enters a mixing tank, wherein the alkalescence of the feces in the mixing tank needs to be guaranteed, the specific measure is to keep the pH value in the mixing tank between 6.5 and 7.5 by adding sodium bicarbonate, and by the scheme, the biogas slurry flowing back to the adjusting tank can play a role in adjusting the pH value, so that the pH value in an anaerobic fermentation system is improved, and the influence caused by acid accumulation can be eliminated.
Wherein the application amount of the semi-solid state fermentation biogas manure in the step E3 is calculated by referring to technical guidelines for measuring and calculating the bearing capacity of livestock and poultry manure soil
The practical method of using the semi-solid state fermentation biogas fertilizer as the base fertilizer in the fields of tea trees or fruit trees comprises the steps of fertilizing by a strip ditch (or ring ditch) method from the bottom of 9 months to the middle ten days of 10 months, correspondingly digging a fertilizing ditch with the length of 60cm-80cm, the width of 20cm-30cm and the depth of 30cm-40cm in a dripping circle of each tree crown, directly applying the semi-solid state biogas fertilizer into the ditch by adopting a mechanical or semi-mechanical irrigation technology, backfilling and covering soil for 10 cm-15 cm, wherein the application amount of the semi-solid state fermentation biogas fertilizer is calculated according to the soil fertilizer supply capacity, the land bearing capacity and the biogas fertilizer fertility, and the application amount per mu is about 10-15 square.
The semi-solid state fermentation biogas manure is used as a base fertilizer to be applied to the vegetable fields, and the semi-solid state fermentation biogas manure is spread in the field blocks, then ploughed, and planted after being idled in winter. The application amount of the semi-solid state fermentation biogas manure needs to be calculated according to the soil fertilizer supply capacity, the land bearing capacity and the biogas manure fertility, and the application amount per mu is about 3.5-4.5.
The application method of the semi-solid state fermentation biogas fertilizer as a base fertilizer in the field of grain crops comprises the step of directly applying the semi-solid state fermentation biogas fertilizer by adopting a mechanized injection technology before transplanting crops, wherein the application amount of the semi-solid state fermentation biogas fertilizer is calculated according to the soil fertilizer supply capacity, the land bearing capacity and the biogas fertilizer fertility, and the application amount per mu is about 2.5-3.5.
Example two:
in a 6 ten thousand-head pig farm stored in a fence every year, the daily production of livestock and poultry manure adopts a water manure flushing and cleaning mode. Livestock and poultry manure enters a sedimentation tank through a ditch, supernatant is discharged after multi-layer sedimentation, bottom sludge flows into an adjusting tank through a pipeline and dilutes fresh manure together with backflow biogas slurry, and the feeding concentration is controlled to be about 6%. The feed is stirred uniformly in a regulating tank and then is conveyed to an up-flow anaerobic solid reactor through a pump, the feed is fermented at medium temperature in an anaerobic reactor, the temperature is controlled at 35 ℃, and the retention time is 18 days. And then performing secondary fermentation in a completely mixed anaerobic fermentation tank, wherein the fermentation temperature is controlled at 35 ℃, and the fermentation is kept for 11 days. And (3) allowing biogas slurry and biogas residues after secondary fermentation to enter a mixing tank, wherein the biogas slurry continuously flows into the mixing tank, the biogas residues intermittently enter the mixing tank, the amount of the biogas residues entering the mixing tank is controlled to be within 1:9-1:4 of the solid-liquid ratio of the final semi-solid biogas fertilizer, 50% of the biogas slurry is lifted by a pump and flows back to an adjusting tank, generally, the pH of the biogas fertilizer needs to be adjusted to 7.7-8.5 by sodium bicarbonate every 20 days or so in the mixing tank, and the continuous and stable operation of a two-stage anaerobic fermentation system is ensured.
The prepared semi-solid state biogas fertilizer has the following property indexes: the pH value is 7.05, the organic matter content is 481g/kg, the nitrogen content is 10.75g/kg, the phosphorus content is 13.69g/kg, and the potassium content is 3.90 g/kg.
The content of heavy metals in the prepared semi-solid biogas fertilizer is as follows: the arsenic content is 3.22mg/kg, and the mercury content is 0.06 mg/kg. Lead content 2.78mg/kg, cadmium content 1.63mg/kg, chromium content 24.11 mg/kg.
Example three:
and (3) applying the semi-solid fermented biogas manure obtained in the second example to a corn field around a farm, and planting a crop of corn in the corn field one year. Transporting the daily produced semi-solid fermented biogas manure to a field biogas manure storage pool by a tank truck, and performing hole application of the semi-solid fermented biogas manure before corn transplantation, wherein the application amount of the biogas manure is 3.0 square/mu. After the fertilizer is applied for 5 years according to the application mode, the content of organic matters and nitrogen in the soil is obviously increased, the effectiveness of slow-acting potassium, quick-acting potassium and available phosphorus nutrients is enhanced, the activity of the soil enzyme is also obviously enhanced, and the soil quality is obviously improved (see table 1 specifically).
TABLE 1 comparison of soil fertility status of applied and unapplied semi-solid fermented biogas manures
TABLE 2 comparison of enzyme activity status of semi-solid fermented biogas manures applied and not applied
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (9)
1. A production and application method of a large-scale pig farm manure semi-solid state fermentation biogas fertilizer is characterized in that the semi-solid state fermentation biogas fertilizer is prepared by a two-stage fermentation and mixing process.
2. The production and application method of the semi-solid fermented biogas manure in the large-scale pig farm according to claim 1, which is characterized by comprising the following steps:
A. collecting excrement and adjusting feeding through an excrement and sewage collecting system and an adjusting tank;
B. performing two-stage anaerobic fermentation on the regulated excrement;
C. mixing the manure after the two-stage anaerobic fermentation with biogas slurry and biogas residues to obtain semi-solid fermented biogas manure;
D. the biogas slurry is refluxed and circulated to the adjusting tank;
E. and (4) storing, distributing and applying the biogas manure.
3. The method for producing and applying the semi-solid fermented biogas manure in the large-scale pig farm according to claim 2, wherein the step A is carried out by a manure collecting system and a regulating tank, so that the feed concentration is controlled to be about 6%.
4. The production and application method of the semi-solid fermented biogas manure in the large-scale pig farm according to claim 2, characterized in that the biogas slurry inflow mode in the step C is continuous inflow, the biogas residue enters intermittently, and the solid-liquid ratio of the semi-solid biogas manure is controlled to be 1:9-1: 4.
5. The method for producing and applying the semi-solid fermented biogas manure in the large-scale pig farm as recited in claim 2, wherein the semi-solid fermented biogas manure obtained in the step C has a pH value of 6.5-7.5, an organic matter content of 450-500g/kg, a nitrogen content of 7.52-13.97g/kg, a phosphorus content of 9.58-17.79g/kg and a potassium content of 3.5-5.0 g/kg.
6. The method for producing and applying the semi-solid fermented biogas manure in the large-scale pig farm according to claim 2, wherein when the pH of the semi-solid fermented biogas manure in the step C is less than 6, the pH value of the biogas manure is adjusted to 7.5-8.5 by using sodium bicarbonate.
7. The production and application method of semi-solid fermented biogas manure in large-scale pig farms according to claim 2, characterized in that biogas slurry in the mixing tank is refluxed to the adjusting tank through a biogas slurry reflux system in the step D, and the biogas slurry reflux ratio is 40% -50%.
8. The production and application method of the semi-solid fermented biogas manure in the large-scale pig farm according to claim 2, characterized in that the concrete steps of the step E are as follows:
e1 conveying the semi-solid fermented biogas manure to a land requiring fertilization in a tank car and pipeline mode;
e2, for the non-fertilization season, conveying the biogas manure to a field biogas manure storage pool, and distributing the biogas manure from the storage pool when the crops need to be fertilized;
e3 calculating the application amount of the semi-solid state fermentation biogas fertilizer as a base fertilizer on fruit trees, grain crops and vegetable plots by combining the soil fertilizer supply capacity, the land bearing capacity and the biogas fertilizer fertility index;
e4 performing matching application of the semi-solid fermented biogas manure according to the obtained application amount.
9. The method for producing and applying the semi-solid fermented manure in the modular pig farm according to claim 8, wherein the step E4 is specifically performed by: the application method of the semi-solid state fermentation biogas manure as a base fertilizer on fruit trees, grain crops and vegetable plots respectively adopts mechanical furrow application, mechanical injection and mechanical spraying.
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