CN112851436A - Method for quickly converting pig manure into organic fertilizer - Google Patents

Method for quickly converting pig manure into organic fertilizer Download PDF

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Publication number
CN112851436A
CN112851436A CN202110330981.6A CN202110330981A CN112851436A CN 112851436 A CN112851436 A CN 112851436A CN 202110330981 A CN202110330981 A CN 202110330981A CN 112851436 A CN112851436 A CN 112851436A
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organic fertilizer
pig manure
nano
rapidly converting
stirring
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王冬芳
蔡冬清
李磊
许贺
李响
张艾
宋燕西
刘亚男
李瑾泽
张小江
吴庆川
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Donghua University
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Donghua University
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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
    • C05G3/40—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting fertiliser dosage or release rate; for affecting solubility
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D9/00—Other inorganic fertilisers
    • C05D9/02—Other inorganic fertilisers containing trace elements
    • 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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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Soil Sciences (AREA)
  • Fertilizers (AREA)

Abstract

The invention discloses a method for quickly converting pig manure into an organic fertilizer, which is characterized in that fresh pig manure is quickly treated by an advanced oxidation technology, and red mud is used as a carrier to prepare a slow-release organic fertilizer rich in humic acid and fulvic acid; and adding aluminum ash to obtain the high-activity slow-release organic fertilizer rich in humic acid, fulvic acid, N and K. The method can realize the harmless treatment and recycling of the pig manure, solve the problem of large-scale stacking of the red mud and the aluminum ash, promote the coordinated sustainable development of the breeding industry, the agriculture and the industry, and has good application prospect.

Description

Method for quickly converting pig manure into organic fertilizer
Technical Field
The invention relates to a method for quickly converting pig manure into an organic fertilizer, belonging to the technical field of agriculture.
Background
At present, pig raising becomes a mainstream breeding project in China, but with the expansion of breeding area, the pollution to the environment is more and more serious. Improper treatment of pig manure can result in eutrophication of water, damage to underground water, air pollution and the like. The pig manure contains rich organic substances and is a superior raw material of organic fertilizer. At present, the main method for organically fertilizing pig manure is biological fermentation, but the method has the problems of long period, large occupied area, odor, slow fertilizer efficiency, residual harmful substances and the like, and a fast, efficient and green pig manure organically fertilizing technology is urgently developed.
The red mud is waste residue generated in the production of alumina, has complex components and is red due to the rich ferric oxide. As a large country for producing alumina in China, the red mud yield is over 7000 million tons every year, most of red mud is difficult to utilize due to resource utilization technology deficiency, and only a large area of land is occupied for building a red mud yard, so that land resources are wasted, and a large amount of manpower, material resources and financial resources are consumed. The red mud disposal site has various hidden dangers, the ground water is polluted by the alkali infiltration of the red mud in the disposal site, and the serious ecological disaster is caused by the collapse of the disposal site, which is a problem that troubles people all the time.
The aluminum ash is scum floating on the aluminum liquid of the electrolytic bath generated in the aluminum electrolysis process. The aluminum ash is divided into primary aluminum ash (white ash) and secondary aluminum ash (black ash). The secondary aluminum ash is an available resource, and if the secondary aluminum ash is not recycled, the resource waste is caused, and the environment is polluted. At present, the utilization of secondary aluminum ash mainly comprises the preparation of aluminum salt and building materials, but has the problems of complex process, secondary pollution, small dosage, low added value and the like. Therefore, a green, efficient and high-added-value resource utilization technology is urgently developed
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing method for organically fertilizing pig manure through biological fermentation has the problems of long period, large occupied area, large odor, slow fertilizer efficiency, residual harmful substances and the like.
In order to solve the technical problems, the invention provides a method for quickly converting pig manure into an organic fertilizer, which comprises the following steps:
step 1: adding red mud into FeSO4Introducing N2 into the solution, stirring for reaction, centrifuging after the reaction is finished to obtain a solid, and drying and crushing to obtain solid powder A;
step 2: mixing the solid powder A with zero-valent nano iron powder to obtain a nano carrier B;
and step 3: adding the nano-carrier B into fresh pig manure, stirring and mixing uniformly, introducing ozone under ultraviolet irradiation, and stirring and reacting to obtain the organic fertilizer C rich in humic acid and fulvic acid.
Preferably, the organic fertilizer C obtained after the step 3 is mixed with aluminum ash to obtain an organic fertilizer D rich in humic acid, fulvic acid, nitrogen and potassium.
Preferably, the FeSO in step 14The concentration of the solution is 1-10 g/L, and the red mud and the FeSO4The mass ratio of the solution is 1: 2-1: 10, and the introduction amount of the N2 is 0.1-0.3 MPa.
Preferably, the stirring reaction time in the step 1 is 3-5 hours, the drying is specifically vacuum drying at 50-100 ℃, and the particle size of the solid powder A is 100-200 meshes.
Preferably, the mass ratio of the solid powder A to the zero-valent nano iron in the step 2 is 1: 1-5: 1.
Preferably, the mass ratio of the nano-carrier B to the fresh pig manure in the step 3 is 1: 5-1: 20, the irradiation amount of ultraviolet irradiation is 100-300 mJ/cm2, the introducing concentration of O3 is 1-3 mg/L, and the stirring reaction time is 30-60 min.
Preferably, the mass ratio of the organic fertilizer C to the aluminum ash is 2: 1-10: 1.
The invention also provides application of the organic fertilizer obtained by the method for quickly converting the pig manure into the organic fertilizer in crop planting.
Compared with the prior art, the invention has the beneficial effects that:
1. the method for quickly converting the pig manure into the organic fertilizer is simple to operate, the manure does not need to be pretreated, the odor of the manure can be eliminated in the oxidation process, the moisture in the manure is reduced, and the main products, namely the humic acid and the fulvic acid, can improve the soil structure, increase the soil fertility and improve the drought resistance and the cold resistance of crops.
2. According to the method for quickly converting the pig manure into the organic fertilizer, the problem of the current stacking amount of the red mud can be solved by adding the red mud, and the advanced oxidation efficiency can be improved. Therefore, the 'harmlessness' and 'reclamation' of the pig manure can be realized; by adding the aluminum ash, the pig manure can be converted into a high-quality and high-efficiency green and environment-friendly organic fertilizer, the problem of low utilization rate of the aluminum ash can be solved, and the problems of environmental pollution and resource recycling of the agricultural industry of the breeding industry are fundamentally solved.
Drawings
FIG. 1 is a graphical representation of the effect of pig manure on potato yield before and after treatment in example 2; wherein, a is the potato obtained after the potato is fertilized with the pig manure before and after the treatment under the same condition, and b is the yield increasing rate of the potato obtained after the potato is fertilized with the pig manure before and after the treatment under the same condition (the yield increasing rate is calculated based on the yield of the potato which is not fertilized under the same condition);
fig. 2 is a three-dimensional fluorescence analysis spectrum of the organic fertilizer D obtained in example 2, wherein a is a three-dimensional fluorescence analysis spectrum of pig manure, b is a three-dimensional fluorescence analysis spectrum of the organic fertilizer D, and a fluorophore indicated by an arrow in b is fulvic acid.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Example 1
A method for rapidly converting pig manure into an organic fertilizer comprises the following steps:
(1) 10g of red mud (100 mesh) was added to 50mL of FeSO4(3g/L) solution, followed by back mixingIntroducing N into the mixed solution2Stirring at normal temperature (100rpm) for 3 hours after (0.1MPa), centrifuging (4000rpm) for 5 minutes, drying in a vacuum oven at 50 ℃, and crushing to 100 meshes to obtain solid powder A;
(2) mixing the solid powder A and zero-valent nano iron powder (100 meshes) according to the weight ratio of 3: 1 to obtain a nano carrier B;
(3) adding the nano-carrier B (1g) into fresh pig manure (10g), fully stirring at room temperature, and then adding the nano-carrier B at the concentration of 100mJ/cm2Under the irradiation of ultraviolet light, introducing O3(1mg/L) for 30min, and continuously stirring (100rpm) to obtain a high-activity slow-release organic fertilizer C rich in humic acid and fulvic acid;
(4) uniformly mixing the organic fertilizer C (5g) obtained in the step (3) with aluminum ash (1g) at room temperature to obtain a high-activity slow-release organic fertilizer D rich in humic acid, fulvic acid, nitrogen (N) and potassium (K);
and uniformly spreading the organic fertilizer D on the soil surface according to 50 kg/mu, and then carrying out rotary tillage, wherein after 90 days, the yield of the potatoes is increased by 40 percent compared with that of the pig manure organic fertilizer produced by equivalent biological fermentation.
Example 2
A method for rapidly converting pig manure into an organic fertilizer comprises the following steps:
(1) 15g of red mud (150 mesh) was added to 60mL of FeSO4(4g/L) solution, followed by feeding N into the mixed solution2Stirring at normal temperature (300rpm) for 4 hours (0.2MPa), centrifuging (4500rpm) for 7min, drying in a vacuum oven at 80 ℃, and crushing to 150 meshes to obtain solid powder A;
(2) mixing the solid powder A and zero-valent nano iron powder (150 meshes) according to the weight ratio of 4: 1 to obtain a nano carrier B;
(3) adding the nano-carrier B (2g) into fresh pig manure (15g), fully stirring at room temperature, and then stirring at 200mJ/cm2Under the irradiation of ultraviolet light, introducing O3(2mg/L) for 50min, and continuously stirring (300rpm) to obtain a high-activity slow-release organic fertilizer C rich in humic acid and fulvic acid;
(4) uniformly mixing the organic fertilizer C (7g) obtained in the step (3) with aluminum ash (1.5g) at room temperature to obtain a high-activity slow-release organic fertilizer D rich in humic acid, fulvic acid, nitrogen (N) and potassium (K); the results of comparing the organic fertilizer D with the pig manure before treatment are shown in Table 2.
Two sets of experiments were designed to verify the fertilizer efficiency of the organic fertilizer obtained in this example:
1. planting potatoes under a non-fertilization condition as a control group, respectively and uniformly spreading untreated pig manure, the organic fertilizer C and the organic fertilizer D on the soil surface according to 75 kilograms per mu, then carrying out rotary tillage, collecting the planted potatoes after 90 days, and calculating the yield increase rate of the potatoes, wherein the result is shown in figure 1;
2. the method comprises the steps of taking potatoes planted under the condition of no fertilization as a control group, respectively and uniformly spreading an organic fertilizer D and a pig manure organic fertilizer produced by equivalent biological fermentation on the surface of soil according to 75 kilograms per mu, carrying out rotary tillage, collecting the planted potatoes after 90 days, and calculating the yield increase rate of the potatoes, wherein the yield increase rate of the organic fertilizer D is 50%, the yield increase rate of the pig manure organic fertilizer produced by equivalent biological fermentation is 38.6%, and the yield of the organic fertilizer D is 11.4% higher than that of the pig manure organic fertilizer produced by equivalent biological fermentation.
TABLE 2 comparison of organic fertilizer D of this example with pig manure before treatment
Figure BDA0002996149680000041
Example 3
A method for rapidly converting pig manure into an organic fertilizer comprises the following steps:
(1) 20g of red mud (200 mesh) was added to 70mL of FeSO4(5g/L) solution, followed by feeding N into the mixed solution2Stirring at normal temperature (400rpm) for 5 hours after (0.3MPa), centrifuging (5000rpm) for 10min, drying in a vacuum oven at 100 ℃, and crushing to 200 meshes to obtain solid powder A;
(2) mixing the solid powder A and zero-valent nano iron powder (200 meshes) according to the weight ratio of 5:1 to obtain a nano carrier B;
(3) adding the nano-carrier B (3g) into fresh pig manure (20g), fully stirring at room temperature, and then adding the nano-carrier B into the fresh pig manure (300 mJ/cm)2Under the irradiation of ultraviolet light, introducing O3(3mg/L) for 60min, and continuously stirring (400rpm) to obtain a high-activity slow organic fertilizer C rich in humic acid and fulvic acid;
(4) uniformly mixing the organic fertilizer C (10g) obtained in the step (3) with aluminum ash (2g) at room temperature to obtain a high-activity slow-release organic fertilizer D rich in humic acid, fulvic acid, nitrogen (N) and potassium (K);
uniformly spreading the organic fertilizer D on the soil surface according to 100 kg/mu, and then carrying out rotary tillage, wherein after 90 days, the yield of the potatoes is increased by 60 percent compared with that of a pig manure organic fertilizer produced by equivalent biological fermentation.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way and substantially, it should be noted that those skilled in the art may make several modifications and additions without departing from the scope of the present invention, which should also be construed as a protection scope of the present invention.

Claims (8)

1. A method for rapidly converting pig manure into an organic fertilizer is characterized by comprising the following steps:
step 1: adding red mud into FeSO4In the solution, N is introduced2Stirring for reaction, centrifuging to obtain a solid after the reaction is finished, and drying and crushing to obtain solid powder A;
step 2: mixing the solid powder A with zero-valent nano iron powder to obtain a nano carrier B;
and step 3: adding the nano-carrier B into fresh pig manure, stirring and mixing uniformly, introducing ozone under ultraviolet irradiation, and stirring and reacting to obtain the organic fertilizer C rich in humic acid and fulvic acid.
2. The method for rapidly converting the pig manure into the organic fertilizer as claimed in claim 1, wherein the organic fertilizer C obtained after the step 3 is mixed with aluminum ash to obtain the organic fertilizer D rich in humic acid, fulvic acid, nitrogen and potassium.
3. The method for rapidly converting pig manure into organic fertilizer according to claim 1, wherein the step 1 is carried outFeSO4The concentration of the solution is 1-10 g/L, and the red mud and the FeSO4The mass ratio of the solution is 1: 2-1: 10, and N is2The pressure of the gas introduction is 0.1 to 0.3 MPa.
4. The method for rapidly converting the pig manure into the organic fertilizer as claimed in claim 1, wherein the stirring reaction time in the step 1 is 3-5 hours, the drying is specifically vacuum drying at 50-100 ℃, and the particle size of the solid powder A is 100-200 meshes.
5. The method for rapidly converting the pig manure into the organic fertilizer as claimed in claim 1, wherein the mass ratio of the solid powder A to the zero-valent nano-iron in the step 2 is 1: 1-5: 1.
6. The method for rapidly converting pig manure into an organic fertilizer according to claim 1, wherein the mass ratio of the nano-carrier B to fresh pig manure in the step 3 is 1: 5-1: 20, and the irradiation amount of ultraviolet irradiation is 100-300 mJ/cm2Said O is3The feeding concentration of the catalyst is 1-3 mg/L, and the stirring reaction time is 30-60 min.
7. The method for rapidly converting the pig manure into the organic fertilizer as claimed in claim 2, wherein the mass ratio of the organic fertilizer C to the aluminum ash is 2: 1-10: 1.
8. The application of the organic fertilizer obtained by the method for rapidly converting the pig manure into the organic fertilizer according to any one of claims 1 to 7 in crop planting.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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CN106986669A (en) * 2017-03-01 2017-07-28 沃邦环保有限公司 It is a kind of to be used to reduce the passivator of heavy metal activity and its application in feces of livestock and poultry
CN111019662A (en) * 2019-12-20 2020-04-17 华南理工大学 Soil water-retaining agent produced by using aluminum ash and preparation method thereof
CN110981579A (en) * 2019-12-24 2020-04-10 泉州南京大学环保产业研究院 Method for preparing organic fertilizer by combining anaerobic fermentation of red mud
CN111892462A (en) * 2020-08-12 2020-11-06 东华大学 Chemical fertilizer treatment method for chicken manure

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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Application publication date: 20210528