CN116199542A - Humic acid-containing liquid fertilizer based on kitchen biogas slurry, preparation method and application - Google Patents
Humic acid-containing liquid fertilizer based on kitchen biogas slurry, preparation method and application Download PDFInfo
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- CN116199542A CN116199542A CN202310260882.4A CN202310260882A CN116199542A CN 116199542 A CN116199542 A CN 116199542A CN 202310260882 A CN202310260882 A CN 202310260882A CN 116199542 A CN116199542 A CN 116199542A
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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
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
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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
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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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
- C05G5/20—Liquid fertilisers
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Abstract
The invention discloses a humic acid-containing liquid fertilizer based on kitchen biogas slurry, a preparation method and application thereof, and the humic acid-containing liquid fertilizer comprises the following components in percentage by weight: 60-100 parts of kitchen biogas slurry, 20-35 parts of nutrient elements, 3.6-7 parts of humic acid, 3-6 parts of dispersing agent, 2-4 parts of thickening agent and 0.3-1.8 parts of synergist. The invention adopts the suspension technology to realize the stable coexistence of the kitchen biogas slurry, the nutrient elements and the functional substances in the suspension system, and the prepared kitchen biogas slurry-based humic acid-containing liquid fertilizer has a synergistic effect on plant growth and plant pathogenic bacteria inhibition. In addition, the kitchen biogas slurry-based humic acid-containing liquid fertilizer has the advantages of high nutrient content, flexible formula, high physical and chemical stability and the like, accords with the technical index, accords with the technical standard of humic acid-containing water-soluble fertilizer liquid products, is extremely easy to disperse and dissolve in water, satisfies various application modes and is beneficial to large-scale popularization.
Description
Technical Field
The invention relates to the technical field of fertilizer production, in particular to a humic acid-containing liquid fertilizer based on kitchen biogas slurry, a preparation method and application thereof.
Background
With the improvement of the living standard of residents in China and the sufficiency of food supply, the generation amount of kitchen wastes is increased. Anaerobic digestion is popularized as a resource utilization technology in kitchen waste management. Anaerobic digestion of kitchen waste produces a large amount of byproducts, namely biogas residues and biogas slurry, and wet anaerobic digestion is taken as an example, wherein the biogas slurry accounts for more than 80% of the total mass of fermentation byproducts. At present, kitchen biogas slurry is discharged after biochemical and physical and chemical advanced treatment, and the treatment cost is high. Related researches show that the kitchen biogas slurry contains substances beneficial to soil and plants, such as organic acid, nitrogen, phosphorus, amino acid and the like. The application of the kitchen biogas slurry can improve the available nutrients of soil, promote plant growth, increase the content of vitamin C in vegetables and improve the quality of crops. In addition, the kitchen biogas slurry also contains humic acid, vitamins, biological stimulation hormone and other functional substances, which is an important explanation for the growth promotion capability of the kitchen biogas slurry. Therefore, the kitchen biogas slurry is used as a liquid organic fertilizer for agricultural production, which is a promising utilization way, not only can realize the resource utilization of the kitchen biogas slurry, but also can reduce the treatment cost of kitchen waste.
The water content of the kitchen biogas slurry is generally more than 95%, the fertilizer efficiency is low, the transportation cost is high, the technical indexes of related standards are not easy to meet, and the kitchen biogas slurry is difficult to popularize and apply commercially. However, the kitchen biogas slurry is an excellent water-soluble fertilizer carrier, the kitchen biogas slurry is taken as a carrier, and the preparation of the functional water-soluble fertilizer is an important value-added way for realizing the kitchen biogas slurry, so that the kitchen biogas slurry has higher environmental protection benefit, economic benefit and social benefit. Because the kitchen biogas slurry has the characteristics of high suspended matters, complex components and the like, the researched and developed biogas slurry-based water-soluble fertilizer has the defects of poor stability, low nutrient content, technical standard failure and the like.
Aiming at the problems, the invention provides a humic acid-containing liquid fertilizer based on kitchen biogas slurry, a preparation method and application thereof, and adopts a suspension technology to realize the stable coexistence of the kitchen biogas slurry, nutrient elements and functional substances in a suspension system, thereby having great significance for commercialization and application popularization.
Disclosure of Invention
The invention aims to provide a humic acid-containing liquid fertilizer based on kitchen biogas slurry, a preparation method and application thereof.
In order to achieve the above purpose, the invention adopts the following technical scheme: the humic acid-containing liquid fertilizer based on the kitchen biogas slurry comprises the following components in percentage by weight: 60-100 parts of kitchen biogas slurry, 20-35 parts of nutrient elements, 3.6-7 parts of humic acid, 3-6 parts of dispersing agent, 2-4 parts of thickening agent and 0.3-1.8 parts of synergist.
Preferably, the kitchen biogas slurry comprises kitchen biogas slurry from which water insoluble substances are removed through an air floatation process after anaerobic fermentation by an EGSB (Expanded Granular Sludge Bed ) reactor.
Preferably, the air floatation process adopts a micro-nano bubble generation technology, and the gas-liquid ratio is 1:9, the grain diameter of the micro-bubbles is 20-40um.
Preferably, the nutrient elements include at least three of ammonia, urea, phosphoric acid, ammonium nitrate, potassium chloride, ammonium polyphosphate, monoammonium phosphate, dipotassium phosphate, potassium polyphosphate, and potassium sulfate.
Preferably, the humic acid comprises potassium fulvate and ammonium humate, and the weight ratio of the potassium humate to the ammonium humate is (0.3-0.6): (0.4-0.7).
Preferably, the dispersing agent is one or more of sodium alginate, sodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate, polyoxyethylene alkylphenol ether, diisooctyl sodium sulfosuccinate, guar gum and chitosan, and preferably two or more of the dispersing agents are combined.
Preferably, the thickener comprises a mixture of xanthan gum, nanosilica and locust gum; wherein xanthan gum: nano silicon dioxide: locust gum = 0.5: (0.15-0.3): (0.2-0.35).
Preferably, the potentiating agent comprises a mixture of cerium nitrate, myo-inositol and L-histidine cerium;
wherein, the mole ratio of lanthanum and cerium is 1: (0.75-1.6).
Preferably, the preparation method of the L-histidine cerium comprises the following steps:
(1) Cerium nitrate and L-histidine are mixed according to a molar ratio of 1: (2.5-4) adding the mixture into deionized water to obtain a mixed solution;
(2) Adjusting the pH value of the mixed solution to 6.0-6.8 by using 2mol/L sodium hydroxide solution;
(3) Under the water bath condition of 68-80 ℃, the water bath is carried out for 8-10 hours, and the mixture is cooled to room temperature; spin-drying with spin-steaming drier to obtain L-histidine cerium powder solid.
Preferably, the cerium nitrate and L-histidine in step (1) include, but are not limited to, 1:2.5, 1:2.6, 1:2.8, 1:3. 1:3.2, 1:3.5, 1:3.8, 1:4.
Preferably, the sodium hydroxide solution in step (2) adjusts the pH of the mixed solution including, but not limited to, 6.0, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, preferably 6.5.
The application also claims a preparation method of the humic acid-containing liquid fertilizer based on the kitchen biogas slurry, which comprises the following steps:
s1, filtering the kitchen biogas slurry through a bag filter to obtain mother liquor, adding the mother liquor into a reaction kettle, adding nutrient elements, heating while stirring, and keeping the reaction temperature at 35-65 ℃;
s2, cooling to 25-35 ℃, regulating the pH of the solution to 8-9.5 by potassium hydroxide, regulating the stirring speed of the reaction kettle to 400-600r/min, adding humic acid, and uniformly stirring for 15-45min;
s3, sequentially adding a synergistic agent, a dispersing agent and a thickening agent into the solution obtained in the S2, and stirring for 45-80min at 300-600r/min to form uniform slurry;
s4, ball milling the solution obtained in the step S3 by a colloid mill for 30-60min to obtain the suspension liquid, and finally obtaining the humic acid-containing liquid fertilizer after quality inspection is qualified.
Preferably, the reaction temperature in step S1 includes, but is not limited to, 35 ℃, 38 ℃, 40 ℃, 42 ℃, 45 ℃, 48 ℃, 50 ℃, 52 ℃, 54 ℃, 55 ℃, 58 ℃, 60 ℃, 62 ℃, 65 ℃.
Preferably, in step S1, the filtration accuracy of the bag filter is 80 microns.
Preferably, the cooling temperature in step S2 includes, but is not limited to, 25 ℃, 26 ℃, 27 ℃, 28 ℃, 29 ℃, 30 ℃, 31 ℃, 32 ℃, 33 ℃, 34 ℃, 35 ℃.
Preferably, the pH of the solution is adjusted with potassium hydroxide in step S2, including but not limited to 8, 8.2, 8.4, 8.5, 8.6, 8.8, 9, 9.2, 9.4, 9.5.
Preferably, the stirring speed of the reaction kettle in the step S2 comprises, but is not limited to, 400r/min, 410r/min, 420r/min, 430r/min, 440r/min, 450r/min, 460r/min, 470r/min, 480r/min, 490r/min, 500r/min, 510r/min, 520r/min, 530r/min, 540r/min, 550r/min, 560r/min, 570r/min, 580r/min, 590r/min and 600r/min.
Preferably, the stirring speed of the reaction kettle in the step S3 comprises, but is not limited to, 300r/min, 320r/min, 350r/min, 380r/min, 400r/min, 420r/min, 440r/min, 450r/min, 460r/min, 480r/min, 500r/min, 520r/min, 540r/min, 550r/min, 560r/min, 580r/min and 600r/min.
The application also claims the use of an acidic soil conditioner as described above for promoting plant growth products and for controlling plant pathogenic bacteria.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. the invention adopts a suspension technology to realize the stable coexistence of kitchen biogas slurry, nutrient elements and functional substances in a suspension system. Compared with single kitchen biogas slurry and humic acid liquid fertilizer, the kitchen biogas slurry-based humic acid liquid fertilizer has synergistic effect on plant growth and plant pathogenic bacteria inhibition. In addition, the kitchen biogas slurry-based humic acid-containing liquid fertilizer is easy to disperse and dissolve in the aqueous solution, meets different application modes, is convenient to use and is beneficial to large-scale popularization.
2. The humic acid-containing liquid fertilizer provided by the invention has the advantages of simple preparation process, easily-adjusted formula and high stability, and the technical index accords with the technical standard of the liquid product of the humic acid-containing water-soluble fertilizer (NT/T1106-2010) of the agricultural industry standard of the people's republic of China, thereby providing convenience conditions for the commercial production and popularization of the fertilizer.
3. The humic acid-containing liquid fertilizer for the kitchen biogas slurry has the commercialized characteristic, realizes the value-added utilization of the kitchen biogas slurry, is beneficial to reducing the treatment cost of kitchen waste, and has obvious environmental protection benefit, economic benefit and profound social benefit.
Detailed Description
The following description of the present invention will be made clearly and fully, and it is apparent that the embodiments described are some, but not all, of the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The humic acid-containing liquid fertilizer based on the kitchen biogas slurry comprises the following components in percentage by weight: 60-100 parts of kitchen biogas slurry, 20-35 parts of nutrient elements, 3.6-7 parts of humic acid, 3-6 parts of dispersing agent, 2-4 parts of thickening agent and 0.3-1.8 parts of synergist.
Further, the kitchen biogas slurry comprises kitchen biogas slurry which is subjected to anaerobic fermentation by an EGSB (Expanded Granular Sludge Bed ) reactor and then is subjected to air floatation process to remove water insoluble matters.
Further, the air floatation process adopts a micro-nano bubble generation technology, and the gas-liquid ratio is 1:9, the grain diameter of the micro-bubbles is 20-40um.
Further, the nutrient elements comprise at least three of ammonia water, urea, phosphoric acid, ammonium nitrate, potassium chloride, ammonium polyphosphate, monoammonium phosphate, dipotassium phosphate, potassium polyphosphate and potassium sulfate.
Further, the humic acid comprises potassium fulvate and ammonium humate, and the weight ratio of the potassium humate to the ammonium humate is (0.3-0.6): (0.4-0.7).
Further, the dispersing agent is one or more of sodium alginate, sodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate, polyoxyethylene alkylphenol ether, diisooctyl sodium sulfosuccinate, guar gum and chitosan, and preferably two or more of the dispersing agents are combined.
Further, the thickener comprises a mixture of xanthan gum, nano-silica and locust gum; wherein xanthan gum: nano silicon dioxide: locust gum = 0.5: (0.15-0.3): (0.2-0.35).
Further, the synergistic agent comprises a mixture of cerium nitrate, myo-alcohol and L-histidine cerium;
wherein, the mole ratio of lanthanum and cerium is 1: (0.75-1.6).
Further, the preparation method of the L-histidine cerium comprises the following steps:
(1) Cerium nitrate and L-histidine are mixed according to a molar ratio of 1: (2.5-4) adding the mixture into deionized water to obtain a mixed solution;
(2) Adjusting the pH value of the mixed solution to 6.0-6.8 by using 2mol/L sodium hydroxide solution;
(3) Under the water bath condition of 68-80 ℃, the water bath is carried out for 8-10 hours, and the mixture is cooled to room temperature; spin-drying with spin-steaming drier to obtain L-histidine cerium powder solid.
Further, cerium nitrate and L-histidine in step (1) include, but are not limited to, 1:2.5, 1:2.6, 1:2.8, 1:3. 1:3.2, 1:3.5, 1:3.8, 1:4.
Further, the pH of the mixed solution adjusted by the sodium hydroxide solution in step (2) includes, but is not limited to, 6.0, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, preferably 6.5.
The embodiment also relates to a preparation method of the humic acid-containing liquid fertilizer based on the kitchen biogas slurry, which comprises the following steps:
s1, filtering the kitchen biogas slurry through a bag filter to obtain mother liquor, adding the mother liquor into a reaction kettle, adding nutrient elements, heating while stirring, and keeping the reaction temperature at 35-65 ℃;
s2, cooling to 25-35 ℃, regulating the pH of the solution to 8-9.5 by potassium hydroxide, regulating the stirring speed of the reaction kettle to 400-600r/min, adding humic acid, and uniformly stirring for 15-45min;
s3, sequentially adding a synergistic agent, a dispersing agent and a thickening agent into the solution obtained in the S2, and stirring for 45-80min at 300-600r/min to form uniform slurry;
s4, ball milling the solution obtained in the step S3 by a colloid mill for 30-60min to obtain the suspension liquid, and finally obtaining the humic acid-containing liquid fertilizer after quality inspection is qualified.
Further, the reaction temperature in step S1 includes, but is not limited to, 35 ℃, 38 ℃, 40 ℃, 42 ℃, 45 ℃, 48 ℃, 50 ℃, 52 ℃, 54 ℃, 55 ℃, 58 ℃, 60 ℃, 62 ℃, 65 ℃.
Further, in step S1, the filtering accuracy of the bag filter is 80 μm.
Further, the cooling temperature in step S2 includes, but is not limited to, 25 ℃, 26 ℃, 27 ℃, 28 ℃, 29 ℃, 30 ℃, 31 ℃, 32 ℃, 33 ℃, 34 ℃, 35 ℃.
Further, adjusting the pH of the solution with potassium hydroxide in step S2 includes, but is not limited to, 8, 8.2, 8.4, 8.5, 8.6, 8.8, 9, 9.2, 9.4, 9.5.
Further, the stirring speed of the reaction kettle in the step S2 includes, but is not limited to, 400r/min, 410r/min, 420r/min, 430r/min, 440r/min, 450r/min, 460r/min, 470r/min, 480r/min, 490r/min, 500r/min, 510r/min, 520r/min, 530r/min, 540r/min, 550r/min, 560r/min, 570r/min, 580r/min, 590r/min, 600r/min.
Further, the stirring speed of the reaction kettle in the step S3 includes, but is not limited to, 300r/min, 320r/min, 350r/min, 380r/min, 400r/min, 420r/min, 440r/min, 450r/min, 460r/min, 480r/min, 500r/min, 520r/min, 540r/min, 550r/min, 560r/min, 580r/min and 600r/min.
This example also relates to the use of an acidic soil conditioner as described above in promoting plant growth products and in controlling phytopathogens.
Example 2
This embodiment is based on embodiment 1 described above, and the same points as those of the above embodiment are not repeated.
The embodiment discloses a functional suspension liquid fertilizer based on kitchen biogas slurry, which is characterized by comprising the following raw materials in parts by weight: 60 parts of kitchen biogas slurry, 23 parts of macroelements, 3.8 parts of humic acid, 4 parts of dispersing agent, 2.5 parts of thickening agent and 0.8 part of synergistic agent.
The kitchen biogas slurry is obtained by anaerobic fermentation in a UASB reactor and then removing insoluble matters in water by an air floatation process.
Further, the air floatation process adopts a micro-nano bubble generation technology, the gas-liquid ratio is 1:9, and the particle size of the micro bubbles is 20-40um.
The nutrient elements comprise urea, ammonia water, phosphoric acid, monoammonium phosphate, ammonium polyphosphate, potassium nitrate and potassium chloride; the proportion of nitrogen, phosphorus and potassium in the nutrient elements is N:P2O5:K2O=35:35:35.
The humic acid is potassium fulvate and ammonium humate, and the weight ratio is 0.6:0.4.
the dispersing agent sodium tripolyphosphate and the diisooctyl sodium sulfosuccinate are mixed according to the weight ratio of 0.7:0.3.
The thickener is a mixture of xanthan gum, nano-silica and locust gum, wherein the xanthan gum: nano silicon dioxide: locust gum = 0.5:0.2:0.3.
The synergistic agent is a mixture of lanthanum nitrate, inositol and L-histidine cerium, wherein the molar ratio of lanthanum to cerium is 1:1.2.
The preparation method of the L-histidine cerium comprises the following steps:
preferably, the preparation method of the cerium glycinate comprises the following steps:
(1) Cerium nitrate and L-histidine are added into deionized water according to the mol ratio of 1:2.5 to obtain a mixed solution;
(2) Adjusting the pH of the mixed solution to about 6.5 with 2mol/L sodium hydroxide solution;
(3) Under the water bath condition of 75 ℃, water bath is carried out for 9 hours, and cooling is carried out to room temperature; spin-drying with spin-steaming drier to obtain L-histidine cerium powder solid.
The method for preparing the humic acid-containing liquid fertilizer based on kitchen waste biogas slurry comprises the following steps of:
s1, filtering the kitchen biogas slurry through a bag filter to obtain mother liquor, adding the mother liquor into a reaction kettle, adding a large number of elements, heating while stirring, and keeping the reaction temperature at 50 ℃;
s2, cooling to 30 ℃, regulating the pH of the solution to 9 by potassium hydroxide, regulating the stirring speed of the reaction kettle to 500r/min, adding humic acid, and uniformly stirring for 30min;
s3, sequentially adding a synergistic agent, a dispersing agent and a thickening agent into the solution obtained in the S2, and stirring for 70min at 450r/min to form uniform slurry;
s4, ball milling the solution obtained in the step S3 by using a colloid mill for 50min to obtain suspension liquid, and finally obtaining the humic acid-containing liquid fertilizer after quality inspection is qualified.
As a preferred embodiment, in the above step S1, the filtering accuracy of the bag filter is 80um.
The application of the functional suspension liquid fertilizer based on the kitchen biogas slurry in preparation of plant growth promotion and prevention of plant pathogenic bacteria.
The application method of the functional suspension liquid fertilizer based on the kitchen biogas slurry is used in a mode of spraying or drip irrigation.
Example 3
This embodiment is performed based on the above embodiment 1 or 2, and the same points as the above embodiment are not repeated.
The embodiment discloses a functional suspension liquid fertilizer based on kitchen biogas slurry, which is characterized by comprising the following raw materials in parts by weight: 80 parts of kitchen biogas slurry, 30 parts of macroelements, 5 parts of humic acid, 5 parts of dispersing agent, 3 parts of thickening agent and 1 part of synergistic agent.
The kitchen biogas slurry is prepared by anaerobic fermentation in an EGSB reactor and then removing water insoluble matters by an air floatation process.
Further, the air floatation process adopts a micro-nano bubble generation technology, the gas-liquid ratio is 1:9, and the particle size of the micro bubbles is 20-40um.
The nutrient elements comprise urea, phosphoric acid, ammonium polyphosphate, potassium nitrate and potassium chloride; the proportion of nitrogen, phosphorus and potassium in the nutrient elements is N:P2O5:K2O=35:35:35.
The dispersing agent sodium alginate and the diisooctyl sodium sulfosuccinate are mixed according to the weight ratio of 0.5:0.5.
The thickener is a mixture of xanthan gum, nano-silica and locust gum, wherein the xanthan gum: nano silicon dioxide: locust gum = 0.5:0.2:0.3.
The synergistic agent is a mixture of lanthanum nitrate, inositol and L-histidine cerium, wherein the molar ratio of lanthanum to cerium is 1:1.2.
The preparation method of the L-histidine cerium comprises the following steps:
preferably, the preparation method of the cerium glycinate comprises the following steps:
(1) Cerium nitrate and L-histidine are added into deionized water according to the mol ratio of 1:3 to obtain a mixed solution;
(2) Adjusting the pH of the mixed solution to about 6.5 with 2mol/L sodium hydroxide solution;
(3) Under the water bath condition of 80 ℃, water bath is carried out for 9 hours, and cooling is carried out to room temperature; spin-drying with spin-steaming drier to obtain L-histidine cerium powder solid.
The method for preparing the humic acid-containing liquid fertilizer based on kitchen waste biogas slurry comprises the following steps of:
s1, filtering the kitchen biogas slurry through a bag filter to obtain mother liquor, adding the mother liquor into a reaction kettle, adding a large number of elements, heating while stirring, and keeping the reaction temperature at 50 ℃;
s2, cooling to 30 ℃, regulating the pH of the solution to 9 by potassium hydroxide, regulating the stirring speed of the reaction kettle to 500r/min, adding humic acid, and uniformly stirring for 30min;
s3, sequentially adding a synergistic agent, a dispersing agent and a thickening agent into the solution obtained in the S2, and stirring for 70min at 450r/min to form uniform slurry;
s4, ball milling the solution obtained in the step S3 by using a colloid mill for 50min to obtain suspension liquid, and finally obtaining the humic acid-containing liquid fertilizer after quality inspection is qualified.
As a preferred embodiment, in the above step S1, the filtering accuracy of the bag filter is 80um.
The application of the functional suspension liquid fertilizer based on the kitchen biogas slurry in preparation of plant growth promotion and prevention of plant pathogenic bacteria.
The application method of the functional suspension liquid fertilizer based on the kitchen biogas slurry is used in a mode of spraying or drip irrigation.
Example 4
This embodiment is performed on the basis of any one of the above embodiments 1 to 3, and the same points as the above embodiments are not repeated.
In the embodiment, the implementation discloses a functional suspension liquid fertilizer based on kitchen biogas slurry, which is characterized by comprising the following raw materials in parts by weight: 100 parts of kitchen biogas slurry, 35 parts of macroelements, 6.5 parts of humic acid, 6 parts of dispersing agent, 4 parts of thickening agent and 1.8 parts of synergistic agent.
The kitchen biogas slurry is prepared by anaerobic fermentation in an EGSB reactor and then removing water insoluble matters by an air floatation process.
Further, the air floatation process adopts a micro-nano bubble generation technology, the gas-liquid ratio is 1:9, and the particle size of the micro bubbles is 20-40um.
The nutrient elements comprise urea, phosphoric acid, ammonium polyphosphate, potassium nitrate and potassium chloride; the proportion of nitrogen, phosphorus and potassium in the nutrient elements is N:P2O5:K2O=35:35:35.
The dispersing agent comprises sodium hexametaphosphate, polyoxyethylene alkylphenol ether and guar gum according to the weight ratio of 0.4:0.4: 0.2.
The thickener is a mixture of xanthan gum, nano-silica and locust gum, wherein the xanthan gum: nano silicon dioxide: locust gum = 0.5:0.1:0.4.
The synergistic agent is a mixture of lanthanum nitrate, inositol and L-histidine cerium, wherein the molar ratio of lanthanum to cerium is 1:1.5.
The preparation method of the L-histidine cerium comprises the following steps:
preferably, the preparation method of the cerium glycinate comprises the following steps:
(1) Cerium nitrate and L-histidine are added into deionized water according to the mol ratio of 1:4 to obtain a mixed solution;
(2) Adjusting the pH of the mixed solution to about 6.5 with 2mol/L sodium hydroxide solution;
(3) Under the water bath condition of 80 ℃, water bath is carried out for 10 hours, and cooling is carried out to room temperature; spin-drying with spin-steaming drier to obtain L-histidine cerium powder solid.
The method for preparing the humic acid-containing liquid fertilizer based on kitchen waste biogas slurry comprises the following steps of:
s1, filtering the kitchen biogas slurry through a bag filter to obtain mother liquor, adding the mother liquor into a reaction kettle, adding a large number of elements, heating while stirring, and keeping the reaction temperature at 50 ℃;
s2, cooling to 30 ℃, regulating the pH of the solution to 9 by potassium hydroxide, regulating the stirring speed of the reaction kettle to 500r/min, adding humic acid, and uniformly stirring for 30min;
s3, sequentially adding a synergistic agent, a dispersing agent and a thickening agent into the solution obtained in the S2, and stirring for 70min at 450r/min to form uniform slurry;
s4, ball milling the solution obtained in the step S3 by using a colloid mill for 50min to obtain suspension liquid, and finally obtaining the humic acid-containing liquid fertilizer after quality inspection is qualified.
As a preferred embodiment, in the above step S1, the filtering accuracy of the bag filter is 80um.
The application of the functional suspension liquid fertilizer based on the kitchen biogas slurry in preparation of plant growth promotion and prevention of plant pathogenic bacteria.
The application method of the functional suspension liquid fertilizer based on the kitchen biogas slurry is used in a mode of spraying or drip irrigation.
The comprehensive content index of the liquid fertilizer is measured by adopting the standard humic acid-containing water-soluble fertilizer (NY 1106-2010) in the agricultural industry of the people's republic of China.
The basic properties and stability of the 3 humic acid containing liquid fertilizer prepared in examples 2 to 4 were analyzed and the results are shown in tables 1 and 2.
The 3 suspension liquid fertilizers were subjected to heat storage (50 ℃) for 14 days, refrigeration (-4 ℃) and freezing (-25 ℃) for 3 times, repeated freezing and thawing for each time (5 days) and normal temperature (25 ℃) storage for 180 days, wherein humic acid content was measured according to a method specified by NY/T1971-2010, nitrogen phosphorus potassium content was measured according to a method specified by NY/T1977-2010, water insoluble matter and pH were measured according to a method specified by NY/T1973-2010, dispersibility was measured according to a method specified by GB/T14825-2006, and viscosity was measured by a paint-4 cup viscometer.
TABLE 1 technical index of humic acid liquid fertilizer
| Analysis index | Example 1 | Example 2 | Example 3 |
| Humic acid content (g/L) | 31.8 | 31.6 | 32 |
| N+P2O5+K2O(g/L) | 372 | 345 | 360 |
| Water insoluble content (g/L) | 6.9 | 5.3 | 8.6 |
| pH(1:250) | 8.32 | 8.06 | 8.26 |
| Viscosity (mm 2/s) | 34.6 | 40.5 | 41.6 |
| Density (g/ml) | 1.12 | 1.08 | 1.21 |
TABLE 2 stability of humic acid liquid fertilizers under different storage conditions
It can be seen from tables 1 and 2 that the nutrient elements are effectively dispersed in the kitchen biogas slurry carrier to form the high-nutrient humic acid liquid fertilizer by adding the dispersing agent and the thickening agent to form a suspension system. In addition, the humic acid liquid fertilizer has low water insoluble matter, good fluidity and excellent storage stability, meets the technical standard of the industry standard humic acid-containing water-soluble fertilizer (NY/T1106-2010), and can be produced and sold on a large scale.
Comparative example 1
The formulation and preparation method of the humic acid containing liquid fertilizer based on the kitchen biogas slurry in this comparative example are the same as in example 2, except that deionized water was used instead of the kitchen biogas slurry in this comparative example.
Comparative example 2
The formulation and preparation method of the functional suspension liquid fertilizer based on the kitchen biogas slurry in this comparative example are the same as in example 2, except that this comparative example does not contain a synergist.
Example 5
The influence of 4 humic acid liquid fertilizers prepared in examples 2 to 4 and comparative example 1 on the growth of cucumber root systems is compared by a hydroponic test, and the specific test method is as follows:
the test set up 7 test treatments in total: the humic acid water-soluble fertilizer of example 2 was diluted 400-fold, 800-fold and 1600-fold; the humic acid water-soluble fertilizer of comparative example 1 was diluted 400-fold, 800-fold and 1600-fold; plant nutrient solution was used as a control.
1 cucumber seedling with 3 true leaves and the same growth vigor is transplanted into a 150ml conical flask filled with 100ml plant nutrient solution, so that the root system of the cucumber seedling is completely immersed in the nutrient solution. The conical flasks were randomly placed in a greenhouse from the university of chinese agriculture organic cycle institute (su zhou) and cucumber plants were harvested after 15 days of growth.
The effect of humic acid water-soluble fertilizer on cucumber root growth in the above examples was analyzed and the results are shown in table 3 below.
TABLE 3 detection results
| Treatment of | Root length | Total root area | Fresh weight of root system | Fresh weight of plant |
| Control | 7.89±0.58 | 8.02±0.23 | 0.68±0.06 | 1.42±0.36 |
| Comparative example 1 (400 times) | 10.36±0.32 | 11.63±0.26 | 0.79±0.08 | 1.68±0.15 |
| Comparative example 1 (800 times) | 12.38±0.98 | 13.88±0.58 | 0.85±0.12 | 1.70±0.22 |
| Comparative example 1 (1600 times) | 14.68±1.32 | 17.73±1.06 | 0.96±0.11 | 1.88±0.24 |
| Example 2 (400 times) | 13.96±0.78 | 15.68±0.98 | 0.89±0.24 | 1.82±0.36 |
| Example 2 (800 times) | 16.68±0.46 | 20.36±0.75 | 1.08±0.18 | 1.98±0.11 |
| Example 2 (1600 times) | 20.32±0.79 | 24.59±0.88 | 1.26±0.16 | 2.15±0.46 |
As can be seen from Table 3, the application of the humic acid water-soluble fertilizers of comparative example 1 and example 2 can promote the growth of cucumber seedling root systems, and the fresh weight of the root systems and the fresh weight of plants are remarkably increased. Along with the increase of dilution, the root length, total root area, root fresh weight and plant fresh weight of cucumber seedlings are also increased. The pro-effect of the treatment of example 1 was better than that of comparative example 1, increasing plant fresh weight by 8.33% (400-fold), 16.5% (800-fold) and 18.1% (1600-fold), respectively. The data show that the humic acid water-soluble fertilizer taking the kitchen biogas slurry as the carrier has better growth promoting effect.
Example 6
This example compares the effect of applying 3 humic acid water-soluble fertilizers prepared in examples 2 to 4 on tomato growth and quality by field test, and the specific test method is as follows:
the test is carried out in a greenhouse in a standard vegetable center of the Shandong Shouguang city. Soil pH 8.87, organic carbon 5.88g/kg, quick-acting phosphorus 16.8mg/kg, total nitrogen 0.52g/kg, quick-acting potassium 88.9mg/kg. The cultivation mode is traditional double-row ridge cultivation, the ridge width is 80cm, the ridge spacing is 50cm, and the tomato plant spacing is 40cm. The 3 humic acid water-soluble fertilizers are enriched according to the proportion of 6L/mu, 12L/mu and 18L/mu in the seedling stage, the flowering stage and the fruiting stage of the tomatoes respectively. Others. The field management is carried out according to the tradition of farmers.
The effect of humic acid water-soluble fertilizer on the growth and quality of the tomatoes in the above examples was analyzed and the results are shown in table 4 below.
TABLE 4 detection results
As can be seen from Table 4, the content of soluble sugars, titratable acids and vitamin C in tomato was increased by 9.84-13.7%, 7.14-9.52% and 6.27-9.05% respectively, compared to the control; at the same time, the content of nitrate is 11.6-20.5%. The data show that the yield and quality of tomatoes can be improved by applying the humic acid water-soluble fertilizer of the embodiment.
The inhibitory effects of the functional suspension liquid fertilizers prepared in example 2 and comparative examples 1 and 2 on botrytis cinerea (Botrytis cinerea Pers), early blight of tomato (Alternaria solani) and botrytis cinerea (Botrytis cinerea Per) were measured.
Botrytis cinerea (Botrytis cinerea Pers) and Phytophthora solani (Alternaria solani) are provided by the institute of plant protection, national academy of agricultural sciences. Botrytis cinerea (Botrytis cinerea Per) is provided by the national agricultural microbiological bacterial collection center of the national institute of agricultural sciences and the agricultural division.
Sterilizing PDA culture medium at 121deg.C for 30min, naturally cooling to 35deg.C, adding humic acid water-soluble fertilizer diluted 400 times in comparative example 1, comparative example 2 and example 1 into Erlenmeyer flask containing culture medium according to the ratio of 0.5mL per 10mL culture medium, mixing with sterile water, and pouring into a dish. After the culture medium in the plate had solidified, the same size pieces were taken with a sterilized punch (d=5 mm) and inverted at the center of the plate. The plate inoculated with the pathogenic bacteria was then placed in a 26℃incubator for 7d of dark culture, and the diameter of the zone of inhibition was measured, and the results are shown in Table 5.
Table 5 test results
From Table 5, it is clear that the humic acid water-soluble fertilizer with the synergistic agent added by taking the kitchen biogas slurry as a carrier has a strong inhibition effect on botrytis cinerea, early blight of tomato and botrytis cinerea.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The humic acid-containing liquid fertilizer based on the kitchen biogas slurry is characterized by comprising the following components in percentage by weight: 60-100 parts of kitchen biogas slurry, 20-35 parts of nutrient elements, 3.6-7 parts of humic acid, 3-6 parts of dispersing agent, 2-4 parts of thickening agent and 0.3-1.8 parts of synergist.
2. The humic acid-containing liquid fertilizer based on kitchen biogas slurry according to claim 1, wherein the kitchen biogas slurry comprises kitchen biogas slurry from which water insoluble substances are removed through an air floatation process after anaerobic fermentation by an EGSB reactor.
3. The humic acid-containing liquid fertilizer based on kitchen biogas slurry according to claim 1, wherein the nutrient elements comprise at least three of ammonia water, urea, phosphoric acid, ammonium nitrate, potassium chloride, ammonium polyphosphate, monoammonium phosphate, dipotassium hydrogen phosphate, potassium polyphosphate, and potassium sulfate.
4. The humic acid-containing liquid fertilizer based on kitchen biogas slurry according to claim 1, wherein the dispersing agent is one or a combination of more of sodium alginate, sodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate, polyoxyethylene alkylphenol ether, diisooctyl sodium sulfosuccinate, guar gum and chitosan.
5. A humic acid containing liquid fertilizer based on kitchen biogas slurry according to claim 2 wherein the thickener comprises a mixture of xanthan gum, nano silica and locust gum; wherein xanthan gum: nano silicon dioxide: locust gum = 0.5: (0.15-0.3): (0.2-0.35).
6. A humic acid containing liquid fertilizer based on kitchen biogas slurry according to claim 1 wherein the synergist comprises a mixture of cerium nitrate, myo-inositol and L-histidine cerium;
wherein, the mole ratio of lanthanum and cerium is 1: (0.75-1.6).
7. The humic acid-containing liquid fertilizer based on kitchen biogas slurry according to claim 6, wherein the preparation method of the L-histidine cerium comprises the following steps:
(1) Cerium nitrate and L-histidine are mixed according to a molar ratio of 1: (2.5-4) adding the mixture into deionized water to obtain a mixed solution;
(2) Adjusting the pH value of the mixed solution to 6.0-6.8 by using 2mol/L sodium hydroxide solution;
(3) Under the water bath condition of 68-80 ℃, the water bath is carried out for 8-10 hours, and the mixture is cooled to room temperature; spin-drying with spin-steaming drier to obtain L-histidine cerium powder solid.
8. A method for preparing a humic acid-containing liquid fertilizer based on kitchen biogas slurry, which is characterized by preparing the humic acid-containing liquid fertilizer based on kitchen biogas slurry according to any one of claims 1 to 7, and specifically comprises the following steps:
s1, filtering the kitchen biogas slurry through a bag filter to obtain mother liquor, adding the mother liquor into a reaction kettle, adding nutrient elements, heating while stirring, and keeping the reaction temperature at 35-65 ℃;
s2, cooling to 25-35 ℃, regulating the pH of the solution to 8-9.5 by potassium hydroxide, regulating the stirring speed of the reaction kettle to 400-600r/min, adding humic acid, and uniformly stirring for 15-45min;
s3, sequentially adding a synergistic agent, a dispersing agent and a thickening agent into the solution obtained in the S2, and stirring for 45-80min at 300-600r/min to form uniform slurry;
s4, ball milling the solution obtained in the step S3 by a colloid mill for 30-60min to obtain the suspension liquid, and finally obtaining the humic acid-containing liquid fertilizer after quality inspection is qualified.
9. The humic acid containing liquid fertilizer based on kitchen biogas slurry according to claim 8 wherein in step S1 the filtration accuracy of the bag filter is 80 μm.
10. Use of an acidic soil conditioner according to any one of claims 1 to 9 for promoting plant growth products and for controlling phytopathogens.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115724699A (en) * | 2022-12-06 | 2023-03-03 | 中农新科(苏州)有机循环研究院有限公司 | Functional suspended liquid fertilizer based on kitchen biogas slurry, preparation method and application |
| CN116530516A (en) * | 2023-05-09 | 2023-08-04 | 中农新科(苏州)有机循环研究院有限公司 | Seed soaking agent for improving germination of plant seeds under stress, preparation method and application |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115724699A (en) * | 2022-12-06 | 2023-03-03 | 中农新科(苏州)有机循环研究院有限公司 | Functional suspended liquid fertilizer based on kitchen biogas slurry, preparation method and application |
| CN116530516A (en) * | 2023-05-09 | 2023-08-04 | 中农新科(苏州)有机循环研究院有限公司 | Seed soaking agent for improving germination of plant seeds under stress, preparation method and application |
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