AU2021100339A4 - A Method For Preparing Organic-Inorganic Compound Fertilizer By Utilizing Kitchen Waste - Google Patents
A 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
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B17/00—Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal
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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
- C05F17/10—Addition or removal of substances other than water or air to or from the material during 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
- C05F17/10—Addition or removal of substances other than water or air to or from the material during the treatment
- C05F17/15—Addition or removal of substances other than water or air to or from the material during the treatment the material being gas
-
- 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
- C05F17/60—Heating or cooling during the treatment
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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
- C05G5/12—Granules or flakes
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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
Abstract
of Descriptions
The present invention provides a kind of method for preparing organic-inorganic
compound fertilizer by utilizing kitchen waste, characterized in that dividing the
kitchen waste into three parts, and then, processing them separately, that is, taking the
oil content which is difficult to be used by biological bacterium as the biodiesel raw
material; and the water content contained and the thick slurry produced during the
process of compression and filtration are fermented with compound biological
inoculants to prepare liquid fertilizer satisfies requirements for agricultural production
after processed; in addition, the solid organic matters of kitchen waste are fermented
with compound biological inoculants and mixed with steel slag powder uniformly as
well as being aged, wherein, the biological bacterium are employed to degrade
minerals in steel slags, and thus, makes the secondary and trace elements of steel slags
can be better absorbed through the action of plants, as well as prepares a kind of
organic-inorganic compound fertilizer. The present invention has the characteristics of
short duration of cycle, simple process equipment, convenient operation, low
production cost, economic and environmental-friendly, etc., and thus, realizes all the
recycling and utilization of kitchen waste, so that is suitable for industrialized
production.
Description
Descriptions
A Method for Preparing Organic-inorganic Compound
Fertilizer by Utilizing Kitchen Waste
Technical Field The present invention relates to the field of solid waste utilization, particularly to a kind of method for preparing organic-inorganic compound fertilizer by utilizing kitchen waste.
Background Technology Kitchen waste is mainly generated during the daily living consumption of residents, which is an integral part of municipal solid waste. With the rapid development of economy and the rising of the living standards of the people, the global output of kitchen waste continues to increase, while there are more than 1.3 billion tons of food produced are wasted annually. In 2015, the kitchen waste output in China was about 56.57 million tons, wherein, the output of the East China region accounted for about 43.18%, followed by the western and central regions. A large amount of kitchen waste resulted in serious environmental problems. If handled inappropriately, it may bring about disease transmission, pollute underground water and surface water, as well as cause unpleasant odors. However, to a certain extent, kitchen waste can be recycled as potential resources. For a long time, plenty of countries must address the problem of how to properly dispose of kitchen waste and convert it into available resources and energy.
In the process of agricultural production in China, straight fertilizers such as phosphate fertilizer, nitrogenous fertilizer and potash fertilizer are always applied for a long time. Relevant researches on mineral fertilizers started relatively late. At the end of the last century, China developed the first generation of three-nutrient compound fertilizer with NPK. However, since the increase in crop yield is very little after applying phosphate, nitrogenous and potash fertilizers for a long time. Instead, it needs to be applied fertilization repeatedly, which not only increases agriculture production costs, but also causes waste of resources. It is due to that it ignores the important role of the ratio of nutritional ingredients between secondary and trace elements and organic matters to the growth process of plant.
Steel will generate a large amount of solid waste during the smelting process, and steel slag is one of them, which is also one of the bulk solid wastes with the worst comprehensive recycling rate in China. The output of steel slags is directly related to the output of steel, and the output of steel slags in China accounts for about 15%-20% of crude steel production. If the crude steel production is calculated of 808 million t/a, the minimum of slags produced is about 120 million t/a. Furthermore, the newly-occupied farmland or land is about 13,100 mu. At present, about 138,000 mu of farmland occupied by steel slags in China, and the accumulated stockpiling of steel slags is close to 1.1 billion, but the comprehensive utilization rate is less than 20%. Aiming at the aforesaid problems, relevant scholars at home and abroad have carried out a lot of researches on the utilization of solid waste fertilizers.
Patent CN109721404A discloses a kind of method for preparing dendrobium substrate. The dendrobium substrate consists of substrate fertilizer layer and a filter layer laid underneath the substrate fertilizer layer; and the substrate fertilizer layer is a mixture of wood chips, saw dust, and decomposed organic fertilizer; wherein, the decomposed organic fertilizer ingredient consists of cattle manure, chicken manure, saw dust, potassium feldspar powder, phosphate rock powder, and dolomite powder, which is made composting fermentation; and the filter layer is composed of a mixture of potash feldspar granolithic and dolomite granolithic. The disadvantages of this technology are that the types and mass fractions of secondary and trace elements contained are limited, and thus, cannot be promoted as a kind of compound fertilizer with comprehensive nutritional ingredients.
Patent CN107857675A provides a kind of compound fertilizer prepared by using slag phosphogypsum and natural medical stone as filling materials and its production method, which utilizes slag phosphogypsum and natural medical stone to prepare synergistic filling materials of the compound fertilizer, and such synergistic filling materials can produce interaction with the main materials for producing compound fertilizers, i.e., monoammonium phosphate, urea and potassium chloride, and thus improve fertilizer efficiency through mutual promotion. Such single approach applied in the method adds monoammonium phosphate, urea, and potassium chloride to slag phosphogypsum and natural medical stone, which will bring about problems such as crystal precipitation and loss of effective elements after long-term storage. In addition, the pelletizing is vulnerable to loosen without binder, and thus, results in reducing fertilizer efficiency in the process of industrial production and application.
Patent CN110550987A relates to a kind of method for processing organic solid waste and the bio-organic fertilizer prepared therefrom, which mainly mixes the moist materials of organic solid waste with crushed auxiliary materials, and then inoculates high-temperature degradation bacteria in the mixture, and thus, guarantees the material is completely aerobiotic, and carry out intermittent stirring and mixing treatment. Moreover, through thermophilic fermentation, the hyperthermophiles undergo aerobic fermentation, static fermentation, and other approaches, and thus, prepare bio-organic fertilizer finally. The duration of such method is too long. According to the test method of this patent, it takes about 30 days to complete the process, and thus, the industrial production cost is relatively high.
The relevant researches and application of aforesaid method which uses solid waste to prepare fertilizer has greatly promoted the progress of the fertilizer industry. The secondary and trace nutritional elements contained in solid waste play an irreplaceable role in the growth and development of crops. Therefore, find out a method to realize the addition of solid waste simply, quickly, efficiently, and safely is of great importance.
Summary of the Present Invention The purpose of the present invention is to overcome the defects in the aforesaid prior art of preparing compound fertilizer through treatment of organic solid waste and inorganic solid waste, and thus, provides a method for preparing organic-inorganic compound fertilizer by utilizing kitchen waste.
The purpose of the present invention can be achieved through following technical scheme:
(1) Put the kitchen waste in the oil-water separator to separate the oil content, water content and solid matters of the kitchen waste;
(2) The oil content separated from Step (1) can be directly used as raw material of biodiesel;
(3) The solid matters separated from Step (1) undergo further compression and filtration, and the thick slurry after compressed and filtrated and the water content separated from Step (1) are evaporated in the MVR evaporator;
(4) Allow the organic liquid of a certain concentration after evaporated through the MVR evaporator in Step (3) to enter the fermentation pool, and then, add biological bacterium to complete biological fermentation, and thus, can be directly used as liquid organic fertilizer after fermentation;
(5) Pulverize and grind the dry matters compressed and filtrated in Step (3), and thus, obtain preparation materials for fermentation;
(6) Stir the preparation materials for fermentation obtained in Step (5) at a temperature of 90°C-130°C and at the stirring rate of 30 r/min-55 r/min, and conduct heat preservation and drying for 10min-25min;
(7) Put the preparation materials for fermentation undergone high-temperature sterilization treatment of Step (6) in the fermentation tank, and then, add biological bacterium, wherein, the mass percentage between the preparation materials for fermentation and the biological bacterium is (80-91) : (9-20), and then, aerate oxygen and carbon dioxide in terms of the mass percentage of (5-8) : (2-5), and the air intake is 100ml/min500ml/min, the stirring rate is 65r/min -240r/min, the temperature is at 45°C-65°C, and thus, complete oxygen-enriched fermentation for 24h-50h of fermentation time;
(8) Ball mill and crush the inorganic solid waste carbon steel slags, and then, pick out the steel slag powder with the particle size of <200-mesh through sieving;
(9) Stir and mix the organic raw materials after oxygen-enriched fermentation in Step (7) and the steel slag powder after ball milling in step (8) for 35min60min;
(10) Aging: store the organic-inorganic mixture obtained in Step (9) at room temperature for 21h 20min35h 50min;
(11) Mix the aged organic-inorganic raw materials in Step (10) with the binder in terms of the mass percentage of (7-9): (1-3), and then, pelletize them, and thus, make organic-inorganic compound fertilizer.
The oil-water separation process in the said Step (1) is mainly separate oil by means of oil scraping, and separate water through filtering as well as transmit solid waste to the compression and filtration device.
Preferably, the concentration of organic matters after evaporated by the MVR evaporator in the said Step (4) is 400g/L-650g /L, and the concentration of total nutrients (N+P 2 0 5+K2 0) in the liquid fertilizer after biological fermentation is >40g/L, and the concentration of water insoluble matters is <50g/L, as well as the pH value range is 4.0-8.0 after diluted according to the ratio of 1:250.
Preferably, the biological bacterium in the said Step (4) and Step (7) are compound microorganism inoculants, with litter bedding as carrier, and the viable count of microorganisms is more than 1.31x109 CFU/g. The natural compound microorganism inoculants with metabolic vitality, strong proliferation ability and ability to function are selected as strains of microbial inoculants. The strains mainly are one or multiple combinations of Bacillus subtilis, Bacillus licheniformis, Acid-producing bacteria, Trichoderma, Lactic Acid Bacteria, Yeast, and Actinomycetes.
Preferably, in the said Step (5), the dry matters are crushed at a high speed in a grinding crusher, wherein, the rotational speed is 18000r/min21OOr/min, the time is 20min-50min, and the particle size is <100-mesh (0.15mm).
Preferably, the carbon steel slag treated in the said Step (8) is the waste residues produced through the converter process, and its components of the mass percentage are: Ca: 38.48%~42.79%, Si: 16.12%~23.82%, Mg: 3.24%~5.62%, Fe: 4.83%~ 6.13% and Al: 0.94%~1.26%. The particle size after ball milling and screening is <0.075mm;
Further, the inorganic solid waste is not only limited to steel slags, it can also be one or multiple combinations of steel slags, magnesium reducing slags, manganese slags, and phosphate tailings.
Preferably, the said binder used in the said step (11) is bentonite, which particle size is <200-mesh (0.075 mm), and the mass fractions of its main components are: Si0 2 : 55.37%~77.23%, A12 0 3 : 13.64%~19.88%, CaO: 1.83%~3.93%, MgO: 2.56%~5.10%, K20: 0.12%~0.19%, Na20: 0.08%~0.13% and Fe203: 0.26%~0.46%.
The beneficial effects of the present invention are: compared with the prior art, the present invention has following advantages:
(1) Divide the kitchen waste into three parts, and then, process them separately, that is, take the oil content which is difficult to be used by biological bacterium as the biodiesel raw material; and the water content contained and the thick slurry produced during the process of compression and filtration are fermented with compound biological inoculants to prepare liquid fertilizer satisfies requirements for agricultural production after processed; the solid organic matters of kitchen waste are combined with industrial solid waste through a series of treatments, and thus, prepare an organic-inorganic compound fertilizer. The present invention creates a new technology for treatment of kitchen waste completely, efficiently, green, and pollution-free.
(2) The solid organic matter of kitchen waste is biologically fermented and mixed with steel slag powder uniformly as well as being aged, wherein, the biological bacterium is employed to degrade minerals in steel slags, and thus, improves the leaching of alkali metals and silicates in steel slag, so that makes the secondary and trace elements of steel slags can be better absorbed through the action of plants.
(3) The present invention mainly uses biological bacterium technology and has the characteristics of short duration of cycle, simple process equipment, convenient operation, low production cost, economic and environmental-friendly, etc., and thus, is suitable for industrialized production.
Detailed Description of the Presently Preferred Embodiments The present invention will be further explained below in conjunction with embodiments; however, the present invention shall not be restricted in any way. Any variations or substitutions made based on the instructions of the present invention shall fall within the protection scope of the present invention.
Embodiment 1
The present invention provides a kind of method for preparing organic-inorganic compound fertilizer by utilizing kitchen waste, characterized in that the preparation method consists of following steps:
(1) Put the kitchen waste in the oil-water separator to separate the oil content, water content and solid matters of the kitchen waste;
(2) The oil content separated from Step (1) can be directly used as raw material of biodiesel;
(3) The solid matters separated from Step (1) undergo further compression and filtration, and the thick slurry after compressed and filtrated and the water content separated from Step (1) are evaporated in the MVR evaporator;
(4) Allow the organic liquid of the concentration of 400g/L after evaporated through the MVR evaporator in Step (3) to enter the fermentation pool, and then, add compound biological bacterium to complete biological fermentation, wherein, the compound biological bacterium includes Bacillus subtilis, Trichoderma, Yeast, and Actinomycetes, after fermentation, the product can be directly used as liquid organic fertilizer, and the concentration of total nutrients (N+P 2 0 5 +K2 0) in the liquid fertilizer after biological fermentation is 40g/L, and the concentration of water insoluble matters is 50g/L, as well as the pH value is 5 after diluted according to the ratio of 1:250.
(5) Crush dry matters filtered out in Step (3) at a high speed, wherein, the rotational speed is 18000r/min, the time is 20min, and the particle size is 100-mesh (0.15mm), and thus, obtain preparation materials for fermentations;
(6) Stir the preparation materials for fermentation obtained in Step (5) at a temperature of 90°C and at the stirring rate of 30 r/min, and conduct heat preservation and drying for 10min;
(7) Put the preparation materials for fermentation undergone high-temperature sterilization treatment of Step (6) in the fermentation tank, and then, add compound biological bacterium, wherein, the compound biological bacterium includes Bacillus subtilis, Trichoderma, Yeast, and Actinomycetes. In addition, the mass percentage between the preparation materials for fermentation and the biological bacterium is 80:20, and then, aerate oxygen and carbon dioxide in terms of the mass percentage of 5:2, and the air intake is 100ml/min, the stirring rate is 65r/min, the temperature is at 45°C, and thus, complete oxygen-enriched fermentation for 24h of fermentation time;
(8) Ball mill and crush the general carbon steel slags produced through the converter process, and then, pick out the steel slag powders with particle size of <200-mesh (0.075mm) through sieving, and the components of the mass percentage are: Ca: 38.48%, Si: 16.12%, Mg: 3.24%, Fe: 4.83% and Al: 0.94%;
(9) Stir and mix the organic raw materials after oxygen-enriched fermentation in Step (7) and the steel slag powders after ball milling in Step (8) for 35min;
(10) Aging: store the organic-inorganic mixture obtained in Step (9) at room temperature for 21h 20min;
(11) Mix the aged organic-inorganic raw materials in Step (10) with the binder (bentonite) in terms of mass percentage of 8:2. The particle size of the bentonite is 200-mesh (0.075mm), and the mass fractions of its main components are: SiO 2 :75.37%, A12 0 3 :16.64%, CaO:1.83%, MgO:4.7%, K20:0.12%, Na20:0.08% and Fe203:0.26%, and then, pelletize them, and thus, make organic-inorganic compound fertilizer.
Embodiment 2
The present invention provides a kind of method for preparing organic-inorganic compound fertilizer by utilizing kitchen waste, characterized in that the preparation method consists of following steps:
(1) Put the kitchen waste in the oil-water separator to separate the oil content, water content and solid matters of the kitchen waste;
(2) The oil content separated from Step (1) can be directly used as raw material of biodiesel;
(3) The solid matters separated from Step (1) undergo further compression and filtration, and the thick slurry after compressed and filtrated and the water content separated from Step (1) are evaporated in the MVR evaporator;
(4) Allow the organic liquid of the concentration of 550g/L after evaporated through the MVR evaporator in Step (3) to enter the fermentation pool, and then, add compound biological bacterium to complete biological fermentation, wherein, the compound biological bacterium includes Bacillus subtilis, Trichoderma, Yeast, and Actinomycetes, after fermentation, the product can be directly used as liquid organic fertilizer, and the concentration of total nutrients (N+P 2 0 5 +K2 0) in the liquid fertilizer after biological fermentation is 45g/L, and the concentration of water insoluble matters is 40g/L, as well as the pH value is 7 after diluted according to the ratio of 1:250.
(5) Crush dry matters filtered out in Step (3) at a high speed, wherein, the rotational speed is 19000r/min, the time is 30min, and the particle size is 100-mesh (0.15mm), and thus, obtain preparation materials for fermentations;
(6) Stir the preparation materials for fermentation obtained in Step (5) at a temperature of 100°C and at the stirring rate of 40 r/min, and conduct heat preservation and drying for 15min;
(7) Put the preparation materials for fermentation undergone high-temperature sterilization treatment of Step (6) in the fermentation tank, and then, add compound biological bacterium, wherein, the compound biological bacterium includes Bacillus subtilis, Trichoderma, Yeast, and Actinomycetes. In addition, the mass percentage between the preparation materials for fermentation and the biological bacterium is 85:15, and then, aerate oxygen and carbon dioxide in terms of the mass percentage of 7:3, and the air intake is 300ml/min, the stirring rate is 150r/min, the temperature is at 50°C, and thus, complete oxygen-enriched fermentation for 40h of fermentation time;
(8) Ball mill and crush the general carbon steel slags produced through the converter process, and then, pick out the steel slag powders with particle size is 200-mesh (0.075mm) through sieving, and the components of the mass percentage are: Ca:41.24%, Si:17.59%, Mg:4.30%, Fe:5.69% and Al:1.1%;
(9) Stir and mix the organic raw materials after oxygen-enriched fermentation in Step (7) and the steel slag powders after ball milling in Step (8) for 40min;
(10) Aging: store the organic-inorganic mixture obtained in Step (9) at room temperature for 27h5Omin;
(11) Mix the aged organic-inorganic raw materials in Step (10) with the binder (bentonite) in terms of mass percentage of 9:1. The particle size of the bentonite is <200-mesh (0.075mm), and the mass fractions of its main components are: Si0 2 :70.11%, A1 2 0 3 :19.29%, CaO:3.93%, MgO:5.1%, K20:0.15%, Na20:0.11% and Fe203:0.31%, and then, pelletize them, and thus, make organic-inorganic compound fertilizer.
Embodiment 3
The present invention provides a kind of method for preparing organic-inorganic compound fertilizer by utilizing kitchen waste, characterized in that the preparation method consists of following steps:
(1) Put the kitchen waste in the oil-water separator to separate the oil content, water content and solid matters of the kitchen waste;
(2) The oil content separated from Step (1) can be directly used as raw material of biodiesel;
(3) The solid matters separated from Step (1) undergo further compression and filtration, and the thick slurry after compressed and filtrated and the water content separated from Step (1) are evaporated in the MVR evaporator;
(4) Allow the organic liquid of the concentration of 650g/L after evaporated through the MVR evaporator in Step (3) to enter the fermentation pool, and then, add compound biological bacterium to complete biological fermentation, wherein, the compound biological bacterium includes Bacillus subtilis, Trichoderma, Yeast, and Actinomycetes, after fermentation, the product can be directly used as liquid organic fertilizer, and the concentration of total nutrients (N+P 2 05 +K20) in the liquid fertilizer after biological fermentation is 60g/L, and the concentration of water insoluble matters is 40g/L, as well as the pH value is 8.0 after diluted according to the ratio of 1:250.
(5) Crush dry matters filtered out in Step (3) at a high speed, wherein, the rotational speed is 21000r/min, the time is 50min, and the particle size is 100-mesh (0.15mm), and thus, obtain preparation materials for fermentations;
(6) Stir the preparation materials for fermentation obtained in Step (5) at a temperature of 130°C and at the stirring rate of 55r/min, and conduct heat preservation and drying for 25min;
(7) Put the preparation materials for fermentation undergone high-temperature sterilization treatment of Step (6) in the fermentation tank, and then, add compound biological bacterium, wherein, the compound biological bacterium includes Bacillus subtilis, Trichoderma, Yeast, and Actinomycetes. In addition, the mass percentage between the preparation materials for fermentation and the biological bacterium is 91:9, and then, aerate oxygen and carbon dioxide in terms of the mass percentage of
8:2, and the air intake is 500ml/min, the stirring rate is 240r/min, the temperature is at 65°C, and thus, complete oxygen-enriched fermentation for 50h of fermentation time;
(8) Ball mill and crush the general carbon steel slags produced through the converter process, and then, pick out the steel slag powders with particle size of <200-mesh (0.075mm) through sieving, and the components of the mass percentage are: Fe203:20.32 o , ZnO:0.08 % , CaO:2.12Q% , MgO:5.47Q% , Si0 2 :41.14% MnO:7.12%,PbO:0.25% andA1 20 3 :23.50 %;
(9) Stir and mix the organic raw materials after oxygen-enriched fermentation in Step (7) and the steel slag powders after ball milling in Step (8) for 60min;
(10) Aging: store the organic-inorganic mixture obtained in Step (9) at room temperature for 35h 50min;
(11) Mix the aged organic-inorganic raw materials in Step (10) with the binder (bentonite) in terms of mass percentage of 8:2. The particle size of the bentonite is 200-mesh (0.075mm), and the mass fractions of its main components are: Si0 2 :76.11%, A1 20 3 :15.88%, CaO:2.22%, MgO:4.01%, K20:0.19%, Na20:0.13% and Fe203:0.46%, and then, pelletize them, and thus, make organic-inorganic compound fertilizer.
Claims (8)
1. A kind of method for preparing organic-inorganic compound fertilizer by utilizing kitchen waste, characterized in that the preparation method consists of following steps:
(1) Put the kitchen waste in the oil-water separator to separate the oil content, water content and solid matters of the kitchen waste;
(2) The oil content separated from Step (1) can be directly used as raw material of biodiesel;
(3) The solid matters separated from Step (1) undergo further compression and filtration, and the thick slurry after compressed and filtrated and the water content separated from Step (1) are evaporated in the MVR evaporator;
(4) Allow the organic liquid of a certain concentration after evaporated through the MVR evaporator in Step (3) to enter the fermentation pool, and then, add biological bacterium to complete biological fermentation, and thus, can be directly used as liquid organic fertilizer after fermentation;
(5) Pulverize and grind the dry matters compressed and filtrated in Step (3), and thus, obtain preparation materials for fermentation;
(6) Stir the preparation materials for fermentation obtained in Step (5) at a temperature of 90°C-130°C and at the stirring rate of 30 r/min-55 r/min, and conduct heat preservation and drying for 10min-25min;
(7) Put the preparation materials for fermentation undergone high-temperature sterilization treatment of Step (6) in the fermentation tank, and then, add biological bacterium, wherein, the mass percentage between the preparation materials for fermentation and the biological bacterium is (80-91) : (9-20), and then, aerate oxygen and carbon dioxide in terms of the mass percentage of (5-8) : (2-5), and the air intake is 100ml/min500ml/min, the stirring rate is 65r/min -240r/min, the temperature is at 45 0 C-65 0 C, and thus, complete oxygen-enriched fermentation for 24h-50h of fermentation time;
(8) Ball mill and crush the inorganic solid waste carbon steel slags, and then, pick out the steel slag powder with the particle size of <200-mesh through sieving;
(9) Stir and mix the organic raw materials after oxygen-enriched fermentation in Step (7) and the steel slag powder after ball milling in Step (8) for 35min60min;
(10) Aging: store the organic-inorganic mixture obtained in Step (9) at room temperature for 21h 20min35h 50min;
(11) Mix the aged organic-inorganic raw materials in Step (10) with the binder in terms of the mass percentage of (7-9): (1-3), and then, pelletize them, and thus, make organic-inorganic compound fertilizer.
2. The said kind of method for preparing organic-inorganic compound fertilizer by utilizing kitchen waste according to Claim 1, characterized in that the oil-water separation process in the said Step (1) is mainly separate oil by means of oil scraping, and separate water through filtering as well as transmit solid waste to the compression and filtration device.
3. The said kind of method for preparing organic-inorganic compound fertilizer by utilizing kitchen waste according to Claim 1, characterized in that the concentration of organic matters after evaporated by the MVR evaporator in the said step (4) is 400g/L-650g /L, and the concentration of total nutrients (N+P 2 05 +K2 0) in the liquid fertilizer after biological fermentation is >40g/L, and the concentration of water insoluble matters is <50g/L, as well as the pH value range is 4.0-8.0 after diluted according to the ratio of 1:250.
4. The said kind of method for preparing organic-inorganic compound fertilizer by utilizing kitchen waste according to Claim 1, characterized in that the biological bacterium in the said Step (4) and Step (7) are compound microorganism inoculants, with litter bedding as carrier, and the viable count of microorganisms is more than 1.31xio9 CFU/g. The natural compound microorganism inoculants with metabolic vitality, strong proliferation ability and ability to function are selected as strains of microbial inoculants. The strains mainly are one or multiple combinations of Bacillus subtilis, Bacillus licheniformis, Acid-producing bacteria, Trichoderma, Lactic Acid Bacteria, Yeast, and Actinomycetes.
5. The said kind of method for preparing organic-inorganic compound fertilizer by utilizing kitchen waste according to Claim 1, characterized in that, in the said Step
(5), the dry matters are crushed at a high speed in a grinding crusher, wherein, the rotational speed is 18OOr/min-210OOr/min, the time is 20min-50min, and the particle size is <100-mesh (0.15mm).
6. The said kind of method for preparing organic-inorganic compound fertilizer by utilizing kitchen waste according to Claim 1, characterized in that, the carbon steel slag treated in the said Step (8) is the waste residues produced through the converter process, and its components of the mass percentage are: Ca: 38.48%~42.79%, Si: 16.12%~23.82%, Mg: 3.24%~5.62%, Fe: 4.83%~6.13% and Al: 0.94%~1.26%. The particle size after ball milling and screening isO0.075mm;
7. The said kind of method for preparing organic-inorganic compound fertilizer by utilizing kitchen waste according to Claim 1, characterized in that, in the said Step (8), the inorganic solid waste treated is not only limited to steel slags, it can also be one or multiple combinations of steel slags, magnesium reducing slags, manganese slags, and phosphate tailings.
8. The said kind of method for preparing organic-inorganic compound fertilizer by utilizing kitchen waste according to Claim 1, characterized in that, the said binder used in the said Step (11) is bentonite, which particle size is <200-mesh (0.075 mm), and the mass fractions of its main components are: Si02: 55.37%~77.23%, A1 2 0 3 : 13.64%~19.88%, CaO: 1.83%~3.93%, MgO: 2.56%~5.10%, K20: 0.12%-0.19%, Na20: 0.08%-0.13% and Fe203: 0.26%~0.46%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113200791A (en) * | 2021-04-21 | 2021-08-03 | 山东碧宇环保工程有限公司 | Method for preparing organic fertilizer from kitchen waste and application of organic fertilizer |
| CN113321224A (en) * | 2021-06-30 | 2021-08-31 | 北京科技大学 | Resource utilization electrolytic manganese slag and solidified CO2Method (2) |
| CN113769743A (en) * | 2021-11-11 | 2021-12-10 | 天津大学 | Iron-based catalyst for efficiently degrading kitchen waste or breeding manure to produce organic fertilizer |
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2021
- 2021-01-19 AU AU2021100339A patent/AU2021100339A4/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113200791A (en) * | 2021-04-21 | 2021-08-03 | 山东碧宇环保工程有限公司 | Method for preparing organic fertilizer from kitchen waste and application of organic fertilizer |
| CN113321224A (en) * | 2021-06-30 | 2021-08-31 | 北京科技大学 | Resource utilization electrolytic manganese slag and solidified CO2Method (2) |
| CN113321224B (en) * | 2021-06-30 | 2022-07-05 | 北京科技大学 | Resource utilization electrolytic manganese slag and solidified CO2Method (2) |
| CN113769743A (en) * | 2021-11-11 | 2021-12-10 | 天津大学 | Iron-based catalyst for efficiently degrading kitchen waste or breeding manure to produce organic fertilizer |
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