CN112592214A - Method for preparing organic-inorganic compound fertilizer by utilizing kitchen waste - Google Patents
Method for preparing organic-inorganic compound fertilizer by utilizing kitchen waste 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
- C05F9/00—Fertilisers from household or town refuse
- C05F9/04—Biological compost
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- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
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- 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
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- C05G5/00—Fertilisers characterised by their form
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- C05G5/12—Granules or flakes
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- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
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Abstract
The invention provides a method for preparing an organic-inorganic compound fertilizer by utilizing kitchen waste, which is characterized in that the kitchen waste is divided into three parts, the three parts are respectively and independently treated, and oil which is difficult to utilize by biological bacteria is used as a biodiesel raw material; treating the water and thick slurry generated in the filter pressing process, and fermenting by adopting a composite biological agent to prepare a liquid fertilizer conforming to agricultural production; the kitchen waste solid organic matter is fermented by the composite biological agent and then is uniformly mixed with the steel slag micro powder for aging, and the degradation of biological bacteria on mineral matters in the steel slag is utilized, so that medium elements and trace elements of the steel slag can be better absorbed by plant action, and the organic-inorganic compound fertilizer is prepared. The method has the characteristics of short cycle time, simple treatment equipment, convenience in operation, low production cost, economy, environmental friendliness and the like, realizes the complete recycling of the kitchen waste, and is suitable for industrial production.
Description
Technical Field
The invention relates to the field of solid waste utilization, in particular to a method for preparing an organic-inorganic compound fertilizer by utilizing kitchen waste.
Background
The kitchen waste is mainly generated in the daily life and consumption process of residents and is an important component of municipal solid waste. With the rapid development of economy and the increasing living standard of people, the global kitchen waste yield is continuously increased, and more than 13 hundred million t of food produced every year is wasted. In 2015, the amount of generated kitchen waste is about 5657 million t, wherein the amount of generated kitchen waste in east China is about 43.18%, and the amount of generated kitchen waste in west and middle China is the next place. A large amount of kitchen waste causes serious environmental problems, and if the kitchen waste is treated improperly, disease transmission, underground water and surface water pollution, peculiar smell generation and the like can be caused. But to a certain extent, the kitchen waste can be recycled as a potential resource. For a long time, many countries have faced the problem of how to properly dispose of the kitchen waste and convert it into usable resources and energy.
In the agricultural production process of China, single fertilizers such as phosphate fertilizers, nitrogen fertilizers and potassium fertilizers are applied for a long time, the research on mineral fertilizers starts late, and the first generation of nitrogen-phosphorus-potassium ternary compound fertilizer is developed in China at the end of the last century. However, after applying nitrogen, phosphorus and potassium fertilizers for a long time, the yield of crops is not obviously increased, and multiple times of fertilization are needed, so that the agricultural production cost is increased, and the resource waste is caused. The reason is that the important effect of the ratio of the medium and trace elements to the organic matter nutrient components on the growth process of the plants is neglected.
Steel and iron can generate a large amount of solid waste in the smelting process, and steel slag is one of the solid waste and is one of the bulk solid waste with the worst comprehensive recovery utilization rate in China at present. The yield of the steel slag is directly related to the yield of steel, the yield of the steel slag in China is about 15% -20% of the yield of crude steel, the yield of the crude steel is calculated by 8.08 hundred million t/a, the lowest yield of the steel slag is about 1.2 hundred million t/a, and the newly increased farmland or land occupies about 1.31 ten thousand mu each year. At present, the farmland land occupied by the steel slag in China is about 13.8 mu per mu, the accumulated stockpiling of the steel slag is nearly 11 hundred million, and the comprehensive utilization rate is less than 20 percent. In view of the problems, a great deal of research on the utilization of solid waste fertilizers is carried out by domestic and foreign related scholars.
Patent CN109721404A discloses a preparation method of a dendrobe matrix, which comprises a matrix fertilizer layer and a water filtering layer laid at the bottom of the matrix fertilizer layer; the substrate fertilizer layer is formed by mixing wood chips, sawdust and decomposed organic fertilizer; the decomposed organic fertilizer is prepared by composting and fermenting cow dung, chicken manure, sawdust, potassium feldspar powder, ground phosphate rock and dolomite powder; the filter layer is prepared by mixing potassium feldspar and dolomite. The technology has the defects that the types and the mass fractions of the contained medium and trace elements are limited, and the medium and trace elements cannot be popularized as a compound fertilizer with comprehensive nutrient components.
The patent CN107857675A provides a compound fertilizer prepared by using slag phosphogypsum and natural medical stone as fillers and a production method thereof, and the compound fertilizer is prepared by using the slag phosphogypsum and the natural medical stone as the fillers, wherein the synergistic fillers can generate the continuous response of mutually promoting and improving the fertilizer efficiency with monoammonium phosphate, urea and potassium chloride which are main materials for producing the compound fertilizer. In the method, monoammonium phosphate, urea and potassium chloride are added into the slag phosphogypsum and the natural medical stone in a single mode, the problems of crystal precipitation, escape of effective elements and the like can occur after long-time storage, the granulation is likely to be loosened easily without a binder, and the fertilizer efficiency is reduced in the application process of industrial production.
Patent CN110550987A relates to a method for treating organic solid waste and a bio-organic fertilizer prepared by the method, wherein wet materials of the organic solid waste are mainly mixed with crushed auxiliary materials, high-temperature degradation bacteria are inoculated to the mixed materials to ensure the materials to be fully aerobic, batch-type turning and mixing treatment is carried out, and the bio-organic fertilizer is finally prepared by high-temperature fermentation, aerobic fermentation of extreme thermophilic bacteria, static fermentation and other methods. The time period of the method is too long, about 30 days are probably needed according to the test method in the patent, and the industrial production cost is high.
The research and application of the solid wastes to prepare the fertilizer greatly promote the progress of the fertilizer industry. The medium and trace nutrient elements in the solid waste have irreplaceable important effects on the growth and development of crops. Therefore, how to simply, quickly, efficiently and safely realize the addition of the solid waste has very important significance.
Disclosure of Invention
The invention aims to overcome the defects of organic solid waste and inorganic solid waste treatment and compound fertilizer preparation in the prior art, and provides a method for preparing an organic-inorganic compound fertilizer by using kitchen waste.
The purpose of the invention can be realized by the following technical scheme:
(1) placing the kitchen waste in an oil-water separator, and separating oil, water and solid matters of the kitchen waste;
(2) the oil separated in the step (1) can be directly used as a biodiesel raw material;
(3) carrying out further filter pressing on the solid matters separated in the step (1), and evaporating the thick slurry subjected to filter pressing and the moisture separated in the step (1) in an MVR evaporator;
(4) allowing the organic liquid with a certain concentration evaporated by the MVR evaporator in the step (3) to enter a fermentation tank, adding biological bacteria for biological fermentation, and directly using the fermented organic liquid as a liquid organic fertilizer;
(5) crushing and grinding the dry matter pressed and filtered in the step (3) to obtain a fermentation preparation material;
(6) stirring the fermentation preparation material in the step (5) at a temperature of 90-130 ℃ at a stirring speed of 30-55 r/min, and keeping the temperature and drying for 10-25 min;
(7) placing the fermentation preparation material subjected to high-temperature sterilization treatment in the step (6) into a fermentation tank, adding biological bacteria, wherein the mass percentage of the fermentation preparation material to the biological bacteria is (80-91): (9-20), introducing oxygen and carbon dioxide in mass percentage of (5-8): 2-5, the air input is 100 ml/min-500 ml/min, the stirring speed is 65 r/min-240 r/min, the temperature is 45-65 ℃, and the fermentation time is 24-50 h for oxygen-enriched fermentation;
(8) ball-milling and crushing inorganic solid waste common carbon steel slag, and screening to select steel slag micro powder with the granularity of less than or equal to 200 meshes;
(9) stirring and mixing the organic raw material subjected to oxygen-enriched fermentation in the step (7) and the steel slag micro powder subjected to ball milling in the step (8) for 35-60 min;
(10) aging: storing the organic-inorganic mixture obtained in the step (9) for 21 to 20 to 35 hours and 50 minutes at normal temperature;
(11) and (3) mixing the organic-inorganic raw material aged in the step (10) with a binder according to the mass percentage of (7-9) to (1-3), and pelletizing to prepare the organic-inorganic compound fertilizer.
And (2) oil-water separation in the step (1) is mainly realized by oil separation in an oil scraping mode and water separation in a filtering mode, and solid waste residues are conveyed to a filter pressing device.
Preferably, the concentration of organic matters evaporated by the MVR evaporator in the step (4) is 400-650 g/L, and the total nutrients (N + P) in the liquid fertilizer after biological fermentation2O5+K2O) concentration is more than or equal to 40g/L, water insoluble substance concentration is less than or equal to 50g/L, and the ratio of the water insoluble substance to the water insoluble substance is 1: the pH value (pH) range after 250 times of dilution is 4.0-8.0.
Preferably, the biological bacteria in the step (4) and the step (7) are compound microbial agents, the sawdust is used as a carrier, and the number of the living bacteria of the microorganisms reaches 1.31 multiplied by 109The microbial inoculum strain is selected from natural compound microorganism strains with strong metabolism activity, proliferation and action capability in the nature, and the strain is mainly one or a combination of bacillus subtilis, bacillus licheniformis, acid-producing bacteria, trichoderma, lactobacillus, saccharomycetes and actinomycetes.
Preferably, in the step (5), the dry substance is crushed in a grinding crusher at a high speed of 18000 r/min-21000 r/min for 20 min-50 min, and the granularity is less than or equal to 100 meshes (0.15 mm).
Preferably, the common carbon steel slag in the step (8) is waste slag generated by a converter process, and comprises the following components in percentage by mass: 38.48 to 42.79 percent of Ca, 16.12 to 23.82 percent of Si, 3.24 to 5.62 percent of Mg, 4.83 to 6.13 percent of Fe and 0.94 to 1.26 percent of Al. The granularity after ball milling and screening is less than or equal to 0.075 mm;
further, the inorganic solid waste is not limited to steel slag, but can be one or a combination of steel slag, magnesium reducing slag, manganese slag and phosphate tailings.
Preferably, the binder in the step (11) is bentonite, the particle size is less than or equal to 200 meshes (0.075 mm), and the mass fraction of the main components is as follows: SiO 22:55.37%~77.23%、Al2O3:13.64%~19.88%、CaO:1.83%~3.93%、MgO:2.56%~5.10%、K2O:0.12%~0.19%、Na2O:0.08%~0.13%、Fe2O3:0.26%~0.46%。
The invention has the beneficial effects that: compared with the prior art, the invention has the following advantages:
(1) dividing the kitchen waste into three parts, respectively and independently treating, and taking oil which is difficult to utilize by biological bacteria as a biodiesel raw material; treating the water and thick slurry generated in the filter pressing process, and fermenting by using biological bacteria to prepare the liquid fertilizer conforming to agricultural production; the organic-inorganic compound fertilizer is prepared by combining a series of treatments and industrial solid wastes of solid organic matters of the kitchen wastes. A new comprehensive, efficient, green and pollution-free treatment technology for the kitchen waste is formed.
(2) After biological fermentation, the solid organic matter of the kitchen waste is uniformly mixed with the steel slag micro powder for aging, and degradation of mineral substances in the steel slag by biological bacteria is utilized, so that leaching of alkali metal and silicate in the steel slag is improved, and medium elements and trace elements of the steel slag can be better absorbed by plant action.
(3) The invention mainly utilizes a biological bacterium technical method, has the characteristics of periodic time period, simple treatment equipment, convenient operation, low production cost, economy, environmental protection and the like, and is suitable for industrial production.
Drawings
FIG. 1 is a flow chart of a preparation process of an organic-inorganic compound fertilizer.
Detailed Description
The invention will be further described with reference to the following examples, which are not intended to be limiting in any way, and any alterations and modifications based on the teachings of the invention are intended to be included within the scope of the invention.
Example 1
The invention provides a method for preparing an organic-inorganic compound fertilizer by utilizing kitchen waste, which is characterized by comprising the following steps:
(1) placing the kitchen waste in an oil-water separator, and separating oil, water and solid matters of the kitchen waste;
(2) the oil separated in the step (1) can be directly used as a biodiesel raw material;
(3) carrying out further filter pressing on the solid matters separated in the step (1), and evaporating the thick slurry subjected to filter pressing and the moisture separated in the step (1) in an MVR evaporator;
(4) the organic liquid evaporated by the MVR evaporator in the step (3) with the concentration of 400g/L enters a fermentation tank, a compound biological agent is added, the compound biological agent comprises bacillus subtilis, trichoderma, saccharomycetes and actinomycetes, biological fermentation is carried out, the fermented organic liquid can be directly used as a liquid organic fertilizer, and the total nutrient (N + P) of the liquid fertilizer2O5+K2O) concentration of 40g/L and water-insoluble concentration of 50g/L, according to a ratio of 1: the pH value (pH) after 250-fold dilution is 5. (ii) a
(5) Crushing the dry matter pressed and filtered in the step (3) at a high speed, wherein the rotating speed is 18000r/min, the time is 20min, and the granularity is 100 meshes (0.15 mm), so as to obtain a fermentation preparation material;
(6) stirring the fermentation preparation material in the step (5) at the temperature of 90 ℃ at the stirring speed of 30 r/min, and preserving heat and drying for 10 min;
(7) placing the fermentation prepared material subjected to high-temperature sterilization treatment in the step (6) into a fermentation tank, adding a composite biological agent, wherein the composite biological agent comprises bacillus subtilis, trichoderma, saccharomycetes and actinomycetes, the mass percentage of the fermentation prepared material to the biological bacteria is 80: 20, the mass percentage of introduced oxygen to carbon dioxide is 5:2, the air input is 100ml/min, the stirring speed is 65r/min, the temperature is 45 ℃, and the fermentation time is 24 hours for oxygen-enriched fermentation;
(8) the method comprises the following steps of carrying out ball milling and crushing on ordinary carbon steel slag generated by a converter process, and screening to select steel slag micro powder with the granularity of 200 meshes (0.075 mm), wherein the steel slag micro powder comprises the following components in percentage by mass: 38.48 percent of Ca, 16.12 percent of Si, 3.24 percent of Mg, 4.83 percent of Fe and 0.94 percent of Al. (ii) a
(9) Stirring and mixing the organic raw material subjected to oxygen-enriched fermentation in the step (7) and the steel slag micro powder subjected to ball milling in the step (8) for 35 min;
(10) aging: storing the organic-inorganic mixture obtained in the step (9) for 21h and 20min at normal temperature;
(11) mixing the organic-inorganic raw material aged in the step (10) with a binder (bentonite) according to a mass ratio of 8:2, wherein the bentonite has a particle size of 200 meshes (0.075 mm), and comprises the following main components in percentage by mass: SiO 22:75.37%、Al2O3:16.64%、CaO:1.83%、MgO:4.7%、K2O:0.12%、Na2O:0.08%、Fe2O30.26 percent, pelletizing and preparing the organic-inorganic compound fertilizer.
Example 2
The invention provides a method for preparing an organic-inorganic compound fertilizer by utilizing kitchen waste, which is characterized by comprising the following steps:
(1) placing the kitchen waste in an oil-water separator, and separating oil, water and solid matters of the kitchen waste;
(2) the oil separated in the step (1) can be directly used as a biodiesel raw material;
(3) carrying out further filter pressing on the solid matters separated in the step (1), and evaporating the thick slurry subjected to filter pressing and the moisture separated in the step (1) in an MVR evaporator;
(4) the organic liquid evaporated by the MVR evaporator in the step (3) with the concentration of 550g/L enters a fermentation tank, a compound biological agent is added, the compound biological agent contains bacillus subtilis, saccharomycetes and actinomycetes, biological fermentation is carried out, the fermented organic liquid can be directly used as a liquid organic fertilizer, and the total nutrient (N + P) of the liquid fertilizer2O5+K2O) concentration of 45g/L, water-insoluble concentration of 40g/L, according to a 1: the pH (pH) after 250-fold dilution was 7. (ii) a
(5) Crushing the dry matter pressed and filtered in the step (3) at high speed, wherein the rotating speed is 19000r/min, the time is 30min, and the granularity is 100 meshes (0.15 mm), so as to obtain a fermentation preparation material;
(6) stirring the fermentation preparation material in the step (5) at the temperature of 100 ℃ at the stirring speed of 40r/min, and keeping the temperature and drying for 15 min;
(7) placing the fermentation prepared material subjected to high-temperature sterilization treatment in the step (6) into a fermentation tank, adding a composite biological agent, wherein the composite biological agent comprises bacillus subtilis, bacillus licheniformis, acid-producing bacteria, trichoderma and saccharomycetes, the mass percentage of the fermentation prepared material to the biological bacteria is 85:15, the mass percentage of introduced oxygen to carbon dioxide is 7:3, the air input is 300ml/min, the stirring speed is 150r/min, the temperature is 50 ℃, and the fermentation time is 40 hours for oxygen-enriched fermentation;
(8) the method comprises the following steps of carrying out ball milling and crushing on ordinary carbon steel slag generated by a converter process, and screening to select steel slag micro powder with the granularity of 200 meshes (0.075 mm), wherein the steel slag micro powder comprises the following components in percentage by mass: 41.24% of Ca, 17.59% of Si, 4.30% of Mg, 5.69% of Fe and 1.1% of Al. (ii) a
(9) Stirring and mixing the organic raw material subjected to oxygen-enriched fermentation in the step (7) and the steel slag micro powder subjected to ball milling in the step (8) for 40 min;
(10) aging: storing the organic-inorganic mixture obtained in the step (9) for 27h and 50min at normal temperature;
(11) after aging in the step (10), theThe organic-inorganic raw material and the binder (bentonite) are mixed according to the mass percentage of 9:1, the particle size of the bentonite is less than or equal to 200 meshes (0.075 mm), and the mass fraction of the main components is as follows: SiO 22:70.11%、Al2O3:19.29%、CaO:3.93%、MgO:5.1%、K2O:0.15%、Na2O:0.11%、Fe2O30.31 percent, pelletizing and preparing the organic-inorganic compound fertilizer.
Example 3
The invention provides a method for preparing an organic-inorganic compound fertilizer by utilizing kitchen waste, which is characterized by comprising the following steps:
(1) placing the kitchen waste in an oil-water separator, and separating oil, water and solid matters of the kitchen waste;
(2) the oil separated in the step (1) can be directly used as a biodiesel raw material;
(3) carrying out further filter pressing on the solid matters separated in the step (1), and evaporating the thick slurry subjected to filter pressing and the moisture separated in the step (1) in an MVR evaporator;
(4) the organic liquid evaporated by the MVR evaporator in the step (3) enters a fermentation tank with the concentration of 650g/L, and is added with a compound biological agent, wherein the compound biological agent comprises bacillus subtilis, bacillus licheniformis, acid-producing bacteria, trichoderma, lactobacillus, saccharomycetes and actinomycetes, biological fermentation is carried out, and the fermented organic liquid can be directly used as a liquid organic fertilizer and the total nutrient (N + P) of the liquid fertilizer2O5+K2O) concentration of 60g/L, water-insoluble concentration of 40g/L, according to a ratio of 1: the pH value (pH) after 250-fold dilution is 8.0. (ii) a
(5) Crushing the dry matter pressed and filtered in the step (3) at a high speed, wherein the rotating speed is 21000r/min, the time is 50min, and the granularity is less than or equal to 100 meshes (0.15 mm) to obtain a fermentation preparation material;
(6) stirring the fermentation preparation material in the step (5) at the temperature of 130 ℃ at the stirring speed of 55r/min, and keeping the temperature and drying for 25 min;
(7) placing the fermentation prepared material subjected to high-temperature sterilization treatment in the step (6) into a fermentation tank, adding a composite biological agent, wherein the composite biological agent comprises bacillus subtilis, bacillus licheniformis, acid-producing bacteria, trichoderma, lactic acid bacteria, saccharomycetes and actinomycetes, the mass percentage of the fermentation prepared material to the biological bacteria is 91:9, the mass percentage of introduced oxygen to carbon dioxide is 8:2, the air input is 500ml/min, the stirring speed is 240r/min, the temperature is 65 ℃, and the fermentation time is 50h for oxygen-enriched fermentation;
(8) carrying out ball milling and crushing on the manganese slag, and screening and selecting manganese slag micro powder with the granularity of less than or equal to 200 meshes (0.075 mm), wherein the manganese slag micro powder comprises the following components in percentage by mass: fe2O3：20.32％、ZnO：0.08％、CaO：2.12％、MgO：5.47％、SiO2：41.14％、MnO：7.12％、PbO:0.25％、Al2O3：23.50％；
(9) Stirring and mixing the organic raw material subjected to oxygen-enriched fermentation in the step (7) and the steel slag micro powder subjected to ball milling in the step (8) for 60 min;
(10) aging: storing the organic-inorganic mixture obtained in the step (9) for 35h and 50min at normal temperature;
(11) mixing the organic-inorganic raw material aged in the step (10) with a binder (bentonite) according to a mass ratio of 7:3, wherein the particle size of the bentonite is not more than 200 meshes (0.075 mm), and the mass fraction of the main components is as follows: SiO 22:76.11%、Al2O3:15.88%、CaO:2.22%、MgO:4.01%、K2O:0.19%、Na2O: 0.13%、Fe2O30.46 percent, pelletizing and preparing the organic-inorganic compound fertilizer.
Claims (8)
1. A method for preparing an organic-inorganic compound fertilizer by utilizing kitchen waste is characterized by comprising the following steps:
(1) placing the kitchen waste in an oil-water separator, and separating oil, water and solid matters of the kitchen waste;
(2) the oil separated in the step (1) can be directly used as a biodiesel raw material;
(3) carrying out further filter pressing on the solid matters separated in the step (1), and evaporating the thick slurry subjected to filter pressing and the moisture separated in the step (1) in an MVR evaporator;
(4) allowing the organic liquid with a certain concentration evaporated by the MVR evaporator in the step (3) to enter a fermentation tank, adding biological bacteria for biological fermentation, and directly using the fermented organic liquid as a liquid organic fertilizer;
(5) crushing and grinding the dry matter pressed and filtered in the step (3) to obtain a fermentation preparation material;
(6) stirring the fermentation preparation material in the step (5) at a temperature of 90-130 ℃ at a stirring speed of 30-55 r/min, and keeping the temperature and drying for 10-25 min;
(7) placing the fermentation preparation material subjected to high-temperature sterilization treatment in the step (6) into a fermentation tank, adding biological bacteria, wherein the mass percentage of the fermentation preparation material to the biological bacteria is (80-91): (9-20), introducing oxygen and carbon dioxide in mass percentage of (5-8): 2-5, the air input is 100 ml/min-500 ml/min, the stirring speed is 65 r/min-240 r/min, the temperature is 45-65 ℃, and the fermentation time is 24-50 h for oxygen-enriched fermentation;
(8) ball-milling and crushing inorganic solid waste common carbon steel slag, and screening to select steel slag micro powder with the granularity of less than or equal to 200 meshes;
(9) stirring and mixing the organic raw material subjected to oxygen-enriched fermentation in the step (7) and the steel slag micro powder subjected to ball milling in the step (8) for 35-60 min;
(10) aging: storing the organic-inorganic mixture obtained in the step (9) for 21 to 20 to 35 hours and 50 minutes at normal temperature;
(11) and (3) mixing the organic-inorganic raw material aged in the step (10) with a binder according to the mass percentage of (7-9) to (1-3), and pelletizing to prepare the organic-inorganic compound fertilizer.
2. The method for preparing the organic-inorganic compound fertilizer by using the kitchen waste as claimed in claim 1, wherein the oil-water separation in the step (1) is mainly performed by oil separation by means of oil scraping and water separation by means of filtration, and the solid waste is conveyed to a filter pressing device.
3. The method for preparing the organic-inorganic compound fertilizer by using the kitchen waste according to claim 1, wherein the method is characterized in thatIn the step (4), the concentration of organic matters evaporated by the MVR evaporator is 400-650 g/L, and the total nutrients (N + P) in the liquid fertilizer after biological fermentation2O5+K2O) concentration is more than or equal to 40g/L, water insoluble substance concentration is less than or equal to 50g/L, and the ratio of the water insoluble substance to the water insoluble substance is 1: the pH value (pH) range after 250 times of dilution is 4.0-8.0.
4. The method for preparing an organic-inorganic compound fertilizer by using kitchen waste according to claim 1, wherein the biological bacteria in the steps (4) and (7) are compound microbial agents, sawdust is used as a carrier, and the number of the microbial viable bacteria reaches 1.31 x 109The microbial inoculum strain is selected from natural compound microorganism strains with strong metabolism activity, proliferation and action capability in the nature, and the strain is mainly one or a combination of bacillus subtilis, bacillus licheniformis, acid-producing bacteria, trichoderma, lactobacillus, saccharomycetes and actinomycetes.
5. The method for preparing the organic-inorganic compound fertilizer by using the kitchen waste according to claim 1, wherein in the step (5), the dry substance is crushed in a grinding crusher at a high speed, wherein the rotating speed is 18000 r/min-21000 r/min, the time is 20 min-50 min, and the particle size is less than or equal to 100 meshes (0.15 mm).
6. The method for preparing the organic-inorganic compound fertilizer by using the kitchen waste according to claim 1, wherein the common carbon steel slag in the step (8) is waste slag generated by a converter process, and comprises the following components in percentage by mass: 38.48 to 42.79 percent of Ca, 16.12 to 23.82 percent of Si, 3.24 to 5.62 percent of Mg, 4.83 to 6.13 percent of Fe and 0.94 to 1.26 percent of Al.
7. The granularity after ball milling and screening is less than or equal to 0.075 mm;
the method for preparing the organic-inorganic compound fertilizer by using the kitchen waste according to claim 1, wherein in the step (8), the inorganic solid waste is not limited to steel slag, but also can be one or more of steel slag, magnesium reducing slag, manganese slag and phosphorus tailings.
8. The method for preparing the organic-inorganic compound fertilizer by using the kitchen waste according to claim 1, wherein the binder in the step (11) is bentonite, the particle size of the bentonite is not more than 200 meshes (0.075 mm), and the mass fraction of the main components is as follows: SiO 22:55.37%~77.23%、Al2O3:13.64%~19.88%、CaO:1.83%~3.93%、MgO:2.56%~5.10%、K2O:0.12%~0.19%、Na2O:0.08%~0.13%、Fe2O3:0.26%~0.46%。
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