CN112341278A - Pig farm wastewater MAP precipitated sludge and edible fungus residue composite organic fertilizer and preparation method thereof - Google Patents

Pig farm wastewater MAP precipitated sludge and edible fungus residue composite organic fertilizer and preparation method thereof Download PDF

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CN112341278A
CN112341278A CN202011237054.1A CN202011237054A CN112341278A CN 112341278 A CN112341278 A CN 112341278A CN 202011237054 A CN202011237054 A CN 202011237054A CN 112341278 A CN112341278 A CN 112341278A
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organic fertilizer
pig farm
precipitated sludge
edible fungus
farm wastewater
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滕青
林炫洁
林慧凡
曾梦凤
李诗迈
林少淇
黎超诚
谢雨晴
杜诚
杨春平
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Guangdong University of Petrochemical Technology
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Guangdong University of Petrochemical Technology
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    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C9/00—Fertilisers containing urea or urea compounds
    • 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
    • C05F17/50—Treatments combining two or more different biological or biochemical treatments, e.g. anaerobic and aerobic treatment or vermicomposting and aerobic treatment
    • 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
    • C05G3/20—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for preventing the fertilisers being reduced to powder; Anti-dusting additives
    • 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
    • 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

The invention discloses a compound organic fertilizer of pig farm wastewater MAP precipitated sludge and edible fungus residues and a preparation method thereof, wherein the compound organic fertilizer comprises the following raw materials: the method comprises the steps of mixing the pretreated MAP precipitated sludge of the pig farm wastewater and the pretreated edible fungus residues, adding the urea and the compound microbial inoculum into the obtained mixed material for fermentation, crushing the fermented material, and granulating to obtain the compound organic fertilizer. The method has the advantages of wide raw material source, low cost, simple process, and remarkable economic benefit, and avoids the use of livestock excrement such as animal feces and urine, thereby preventing growth hormone, antibiotics and heavy metals for livestock from being introduced into soil and absorbed by crops.

Description

Pig farm wastewater MAP precipitated sludge and edible fungus residue composite organic fertilizer and preparation method thereof
Technical Field
The invention relates to the field of utilization of cultivation wastes and the field of utilization of agricultural and forestry wastes, in particular to a compound organic fertilizer of pig farm wastewater MAP precipitated sludge and edible fungus residues and a preparation method thereof.
Background
Data of national environmental statistics bulletin (2015) published in 2.2017 show that the discharge amount of chemical oxygen demand and ammonia nitrogen of livestock and poultry breeding is 1015.5 and 55.2 million tons respectively, and the discharge amount of the chemical oxygen demand and the ammonia nitrogen of the livestock and poultry breeding accounts for 95.03 percent and 76.03 percent of the discharge amount of agricultural sources and accounts for 45.67 percent and 24.01 percent of the corresponding total discharge amount of the whole country. The pig farm wastewater not only contains high-concentration organic matters, nitrogen and phosphorus, but also carries a large amount of toxic substances, such as antibiotics, heavy metals, hormones and the like, and if the wastewater is directly discharged without being treated, the water body is eutrophicated, the water body is anoxic, the ecological balance of the water body is damaged, and even the water body becomes black and smelly. Experimental research and engineering application prove that in the existing piggery sewage treatment process, the anaerobic-aerobic combined process is effective in removing COD and SS, is not ideal in denitrification and dephosphorization effect, is seriously lack of effective control technology of nitrogen and phosphorus, and cannot meet the stricter and stricter wastewater discharge requirement.
Struvite precipitation (MAP precipitation) is used for pig wastewater treatment: when there is Mg in the waste water or solution2+、PO4 3–、NH4 +When three ions exist, the ion concentration product is larger than MgNH4PO4·6H2The product constant of O solubility is generated, MAP precipitation reaction is carried out, and MgNH is generated4PO4·6H2O (MAP, struvite). Precipitation product MAP (MgNH)4PO4·6H2O，Struvite), white crystalline powder, with a relative density of 1.71, is easily soluble in acid, insoluble in alkali, water and ethanol solutions, has the characteristic of slow release of nitrogen and phosphorus after being applied to farmlands, is regarded as an extremely valuable agricultural slow release fertilizer, and has various advantages of rapid and easy reaction, easy realization of reaction conditions and the like. The MAP precipitation method has the characteristic of realizing nitrogen and phosphorus treatment and resource utilization simultaneously, and becomes a new method which is concerned in livestock and poultry breeding wastewater treatment in recent years. The pig farm waste water is treated by a magnesium ammonium phosphate chemical precipitation method to form precipitated sludge with large production amount, although the content of nitrogen and phosphorus is high, the pig farm waste water has high fertilizer use value, and if the pig farm waste water is not properly treated, secondary pollution to the environment is easily caused. How to effectively utilize the precipitated sludge is a hot issue of current research.
The cultivation raw material of the edible fungi mainly comprises plant straws, broad-leaved tree sawdust, cottonseed hulls and the like, wherein the cultivation raw material contains a large amount of lignin, cellulose, hemicellulose, lignin and other components, macromolecular nutrients are generally difficult to be directly absorbed by plants, the edible fungi can generate a large amount of complex enzymes for decomposing the cellulose and the hemicellulose, peroxidase and laccase for degrading the lignin in the growth and propagation process of the edible fungi on a culture material rich in the cellulose, and the hemicellulose, the cellulose and the lignin in the crop straws or the sawdust can be decomposed into glucose, ketone compounds and the like for the growth and propagation of the mycelium of the edible fungi. The solid waste left after the production of the edible fungi is collectively called fungi residues. Although part of nutrients in the mushroom dregs are absorbed and utilized by hyphae, the mushroom dregs contain organic acid, saccharides, enzymes, bioactive substances, abundant proteins and other nutrient components, and meanwhile, a large number of living hyphae distributed in the mushroom dregs can also be used as efficient nutrients for plants, so the mushroom dregs are good organic matter sources for the growth of various crops. At present, most of the treatment of the fungus dregs in China is natural stacking, and the fungus cultivation waste contains a large amount of organic matters, so that the biological and environmental resources are greatly wasted by simple discarding; but also causes serious environmental pollution, causes microorganism breeding and disease transmission, thereby causing serious influence on the health of nearby residents.
At present, in the research of edible fungus residues, animal wastes such as animal wastes and urine are mostly added for composting, however, the animal wastes and urine often contain substances such as growth hormone, antibiotics and heavy metals, and when the substances are used as organic fertilizers and applied to farmlands, the substances finally enter human bodies through plants and harm the health of the human bodies.
Therefore, the pig farm wastewater is treated with MAP to obtain precipitation product (MgNH)4PO4·6H2O) the organic fertilizer is prepared by combining the edible fungus residues, so that the two agricultural and forestry wastes of the pig farm breeding wastewater and the edible fungus residues can be effectively recycled, and a larger environmental protection effect and an economic effect can be generated.
Disclosure of Invention
The invention aims to provide a preparation method of a compound organic fertilizer of pig farm wastewater MAP precipitated sludge and edible fungus residues, which has the advantages of wide raw material source, low price, simple process and remarkable economic benefit, avoids using livestock excrement such as animal excrement and urine, and further avoids introducing growth hormone, antibiotics, heavy metals and the like for livestock into soil to be absorbed by crops.
In order to realize the technical purpose, the invention provides a compound organic fertilizer of pig farm wastewater MAP precipitated sludge and edible fungus residues, which comprises the following raw materials in percentage by mass: 88 to 93.8 percent of edible fungus dregs, 5 to 9 percent of pig farm wastewater MAP precipitated sludge, 1 to 3 percent of urea and 0.2 to 0.5 percent of composite microbial inoculum.
Further, the edible mushroom dregs are a mixture of pleurotus eryngii dregs and flammulina velutipes dregs in a mass ratio of 1-2: 1-2.
Furthermore, the carbon content of the edible fungus residues is 40-55%, and the nitrogen content is 1.5-2.5%. .
Furthermore, the mass percent of ammonia nitrogen, phosphorus and magnesium in the MAP precipitated sludge of the pig farm wastewater is 4-5.5%, 12-15% and 8-9%.
Further, the composite microbial inoculum comprises a strain mixture of cellulose decomposing bacteria, bacillus subtilis, bacillus polymyxa, bacillus brevis, saccharomycetes and lactobacillus in a mass ratio of (1.5-2) to (1-1.5) to (1.5-2) to (1-2).
The invention also provides a preparation method of the compound organic fertilizer of the pig farm wastewater MAP precipitated sludge and the edible fungus residues, which comprises the following steps: mixing the pretreated MAP precipitated sludge of the pig farm wastewater and the pretreated edible fungus residues to obtain a mixed material, adding urea and an activated compound microbial inoculum into the mixed material for composting fermentation, and crushing and granulating the fermented material to obtain the compound organic fertilizer.
Further, the pig farm wastewater MAP precipitated sludge pretreatment mode is as follows: screening MAP precipitated sludge of pig farm wastewater by a 1-2cm sieve to remove impurities, drying at 50 ℃ for 72h, crushing by a crusher, and screening by a 60-mesh sieve.
Further, the edible fungus dreg pretreatment mode is as follows: mechanically pulverizing the edible fungus residues to a length of less than 0.5cm, and naturally drying until the water content is 50% -55%.
Further, the activation method of the complex microbial inoculum comprises the following steps: adding a strain mixture with the total effective viable count of more than or equal to 100 hundred million/g into water at the temperature of 25-30 ℃, sealing and standing for 8-12h, wherein the mass ratio of the strain mixture to the water is 1: 90-110.
Further, the fermentation mode is as follows: the raw materials are fully mixed and then are put into a composting barrel, and the initial water content of the compost is adjusted to 60%. Turning the compost every 5 days for 1 time, maintaining the water content of the compost body to be about 60%, piling for 30 days, and after-ripening for 10 days.
Further, the material obtained by fermentation is crushed and sieved by a 50-mesh sieve.
Further, the C/N ratio in the mixed material is 20-25.
Further, the granulation method comprises the following steps: adding a binder containing 8% of polyvinyl alcohol solution in mass percent into the crushed materials, uniformly mixing, granulating, and drying to obtain the granular composite organic fertilizer with the water content of less than 15%.
Compared with the prior art, the invention has the beneficial effects that:
the edible fungus dregs not only contain active substances such as various microorganisms and enzymes, but also contain a large amount of nutrient substances, organic matters, nutrients of nitrogen, phosphorus and potassium, and the fungus dregs are composted and fermented to prepare fertilizer for use.
According to the method, the edible fungus residues and the precipitated sludge are compositely prepared into the organic fertilizer, so that the waste is reduced, the economic income can be increased, the MAP precipitated sludge is used as a chemical precipitator and does not contain growth hormone, antibiotics and heavy metals, and the MAP precipitated sludge is used as an additive to be added into the fermentation process of the edible fungus residues, so that a high-quality organic fertilizer can be produced, the fertilizer efficiency is high, the magnesium element is contained, and the growth of crops can be promoted. Meanwhile, the invention matches the nutrient substances in the fermentation raw materials by adjusting the dosage of each raw material, the selection and matching of strains and the adjustment of the carbon-nitrogen ratio, thereby obtaining the compound organic fertilizer with high fertilizer efficiency.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The specification and examples are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
Example 1
(1) Pretreating edible fungus residues: mixing Pleurotus eryngii fungi residue and Flammulina velutipes fungi residue at a mass ratio of 1:1, mechanically pulverizing to length of below 0.5cm, and naturally drying to water content of 50%. The mixed mushroom dregs contain 48.2% of C, 1.35% of N and 35.7% of C/N.
(2) Pretreating MAP (MAP) precipitated sludge in pig farm wastewater: screening MAP precipitated sludge of pig farm wastewater by a 1-2cm sieve to remove impurities, drying at 50 ℃ for 72h, crushing by a crusher, and screening by a 60-mesh sieve.
(3) Activating the complex microbial inoculum: selecting a composite microbial inoculum with the effective viable count of more than or equal to 100 hundred million/g, wherein the mass ratio of cellulose decomposing bacteria, bacillus subtilis, bacillus polymyxa, bacillus brevis, saccharomycetes and lactobacillus in the composite microbial inoculum is 2: 1: 1: 1: 1.5: 1.5. according to the weight ratio of 1: 100 is put into warm water with the temperature of 25 ℃ for activation, and is sealed and kept stand for 10 hours to obtain activated bacteria liquid.
(4) Fermentation: taking 10kg of the edible fungus residues pretreated in the step (1), adding 1kg of pig farm wastewater MAP precipitated sludge pretreated in the step (2), then adding 0.02kg of activated complex microbial inoculum, and adding urea to adjust the C/N ratio to be 20. Mixed well and loaded into a composting bucket and the initial moisture content of the compost is adjusted to about 60%. And turning the compost for 1 time every 5 days, maintaining the water content of the compost body to be about 60%, piling for 30 days, after-ripening for 10 days, crushing and sieving by a 50-mesh sieve to obtain the decomposed fertilizer.
(5) Preparing the decomposed fertilizer obtained in the step (4) into granular fertilizer: and (4) uniformly mixing the decomposed fertilizer obtained in the step (4) with a polyvinyl alcohol solution, wherein the added binder is 8% of the polyvinyl alcohol solution. The dosage is that every 1kg of decomposed fertilizer is added with 250ml of 8% polyvinyl alcohol solution; granulating by a granulator, and drying the obtained wet granules at 50 ℃ until the water content of the fertilizer is 13.8% and the nitrogen content is 3.5%.
Example 2
(1) Pretreating edible fungus residues: mixing Pleurotus eryngii fungi residue and Flammulina velutipes fungi residue at a mass ratio of 2:1, mechanically pulverizing to length of below 0.5cm, and naturally drying to water content of 50%. The mixed mushroom dregs contain 47.2% of C, 1.25% of N and 37.7% of C/N.
(2) Pretreating MAP (MAP) precipitated sludge in pig farm wastewater: screening MAP precipitated sludge of pig farm wastewater by a 1-2cm sieve to remove impurities, drying at 50 ℃ for 72h, crushing by a crusher, and screening by a 60-mesh sieve.
(3) Activating the complex microbial inoculum: selecting a composite microbial inoculum with the effective viable count of more than or equal to 100 hundred million/g, wherein the mass ratio of cellulose decomposing bacteria, bacillus subtilis, bacillus polymyxa, bacillus brevis, saccharomycetes and lactobacillus in the composite microbial inoculum is 1.5: 1: 1.5. Activating in 25 deg.C warm water at a weight ratio of 1: 100, sealing and standing for 10 hr to obtain activated bacteria liquid.
(4) Fermentation: taking 10kg of the edible fungus residues pretreated in the step (1), adding 0.6kg of MAP precipitated sludge of the pig farm wastewater pretreated in the step (2), then adding 0.03kg of activated composite microbial inoculum, and adding urea to adjust the C/N ratio to be 22. Mixed well and loaded into a composting bucket and the initial moisture content of the compost is adjusted to about 60%. And turning the compost for 1 time every 5 days, maintaining the water content of the compost body to be about 60%, piling for 30 days, after-ripening for 10 days, crushing and sieving by a 50-mesh sieve to obtain the decomposed fertilizer.
(5) Preparing the decomposed fertilizer obtained in the step (4) into granular fertilizer: and (4) uniformly mixing the decomposed fertilizer obtained in the step (4) with a polyvinyl alcohol solution, wherein the added binder is 8% of the polyvinyl alcohol solution. The dosage is that every 1kg of decomposed fertilizer is added with 250ml of 8% polyvinyl alcohol solution; granulating by a granulator, and drying the obtained wet granules at 50 ℃ until the water content of the fertilizer is 14.0% and the nitrogen content is 3.3%.
Example 3
(1) Pretreating edible fungus residues: mixing Pleurotus eryngii fungi residue and Flammulina velutipes fungi residue at a mass ratio of 1:2, mechanically pulverizing to length of below 0.5cm, and naturally drying to water content of 50%. The mixed C content of the mushroom dregs is 44.2 percent, the N content is 1.45 percent, and the C/N is 37.7.
(2) Pretreating MAP (MAP) precipitated sludge in pig farm wastewater: screening MAP precipitated sludge of pig farm wastewater by a 1-2cm sieve to remove impurities, drying at 50 ℃ for 72h, crushing by a crusher, and screening by a 60-mesh sieve.
(3) Activating the complex microbial inoculum: selecting a composite microbial inoculum with the effective viable count of more than or equal to 100 hundred million/g, wherein the mass ratio of cellulose decomposing bacteria, bacillus subtilis, bacillus polymyxa, bacillus brevis, saccharomycetes and lactobacillus in the composite microbial inoculum is 1.5: 1: 1.5: 2. Activating in 25 deg.C warm water at a weight ratio of 1: 100, sealing and standing for 10 hr to obtain activated bacteria liquid.
(4) Fermentation: taking 10kg of the edible fungus residues pretreated in the step (1), adding 0.8kg of pig farm wastewater precipitated sludge pretreated in the step (2), then adding 0.05kg of activated composite microbial inoculum, and adding urea to adjust the C/N ratio to be 25. Mixed well and loaded into a composting bucket and the initial moisture content of the compost is adjusted to about 60%. And turning the compost for 1 time every 5 days, maintaining the water content of the compost body to be about 60%, piling for 30 days, after-ripening for 10 days, crushing and sieving by a 50-mesh sieve to obtain the decomposed fertilizer.
(5) Preparing the decomposed fertilizer obtained in the step (4) into granular fertilizer: and (4) uniformly mixing the decomposed fertilizer obtained in the step (4) with a polyvinyl alcohol solution, wherein the added binder is 8% of the polyvinyl alcohol solution. The dosage is that every 1kg of decomposed fertilizer is added with 250ml of 8% polyvinyl alcohol solution; granulating by a granulator, and drying the obtained wet granules at 50 ℃ until the water content of the fertilizer is 14.5% and the nitrogen content is 3.6%.
Comparative example 1
The difference from example 1 is that the composite microbial inoculum in step (3) is replaced by commercial EM microbial inoculum, which mainly comprises photosynthetic bacteria, lactic acid bacteria, yeast and fermentation filamentous bacteria.
Comparative example 2
The difference from example 1 is that no MAP precipitated sludge was added in step (4).
Comparative example 3
The difference from the embodiment 1 is that the flammulina velutipes mushroom dregs in the step (1) are replaced by pleurotus eryngii mushroom dregs.
Comparative example 4
The difference from example 1 is that no urea is added in step (4).
Effect verification:
the organic fertilizer prepared in examples 1-3 and comparative examples 1-4 was subjected to field tests, which were conducted with 8 treatments: a (example 1); b (example 2); c (example 3); d (comparative example 1); e (comparative example 2); f (comparative example 3); g (comparative example 4); h (blank control). Each process has 2 parallel cells, for a total of 20 cells. The cells are randomly distributed and have an area of 9m2(7.5 m.times.1.2 m), and an empty space of 40cm is left between cells as an interval. The number of the tomatoes in each cell is 24, and the tomatoes are divided into two rows. Three days before tomato seedling transplantation, A to E are treated to respectively apply 337.5 kg/mu of the organic fertilizer prepared in examples 1 to 3 and comparative examples 1 to 2 as base fertilizer, A to G are treated after 50 days to respectively apply 112.5 kg/mu of the organic fertilizer prepared in examples 1 to 3 and comparative examples 1 to 4 as additional fertilizer, and treatment H is blank control without fertilizer application. After the tomatoes are ripe, the fruits are picked in batches and weighed, and the average value is calculated for each treatment. Watering and pest control are carried out on all plots according to a conventional method.
The yield of each plot in the test field is shown in table 1:
TABLE 1 yields of different treatments
Figure BDA0002767052990000071
The results show that the edible fungus residues contain organic acid, saccharides, enzyme, bioactive substances, abundant protein and other nutrient components, the prepared fertilizer has the effect of increasing the fertilizer efficiency by the mutual coordination and coordination of the edible fungus residues and different strains in the composite microbial inoculum, and meanwhile, the prepared organic fertilizer has very remarkable yield increase effect on crops by being matched with the MAP precipitated sludge of the piggery wastewater and by the regulation of the carbon-nitrogen ratio of urea.
As mentioned above, the invention has better effect and can effectively promote the growth of crops.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.

Claims (9)

1. The compound organic fertilizer is characterized by comprising the following raw materials in percentage by mass: 88 to 93.8 percent of edible fungus dregs, 5 to 9 percent of pig farm wastewater MAP precipitated sludge, 1 to 3 percent of urea and 0.2 to 0.5 percent of composite microbial inoculum.
2. The compound organic fertilizer of the pig farm wastewater MAP precipitated sludge and the edible mushroom dregs as claimed in claim 1, wherein the edible mushroom dregs are a mixture of Pleurotus eryngii dregs and Flammulina velutipes dregs in a mass ratio of 1-2: 1-2.
3. The compound organic fertilizer of the MAP precipitated sludge from the pig farm wastewater and the edible fungus residues as claimed in claim 1, wherein the carbon content of the edible fungus residues is 40-55%, and the nitrogen content is 1.5-2.5%.
4. The compound organic fertilizer of the pig farm wastewater MAP precipitated sludge and the edible fungus residues as claimed in claim 1, wherein the mass percent of ammonia nitrogen, phosphorus and magnesium in the pig farm wastewater MAP precipitated sludge is 4-5.5%, 12-15% and 8-9%.
5. The compound organic fertilizer of the pig farm wastewater MAP precipitated sludge and the edible fungus residues as claimed in claim 1, wherein the compound microbial inoculum comprises a strain mixture of cellulose decomposing bacteria, bacillus subtilis, bacillus polymyxa, bacillus brevis, saccharomycetes and lactobacillus in a mass ratio of (1.5-2) to (1-1.5) to (1.5-2) to (1-2).
6. The preparation method of the compound organic fertilizer as claimed in any one of claims 1-5, characterized by comprising the following steps: mixing the pretreated MAP precipitated sludge of the pig farm wastewater and the pretreated edible fungus residues to obtain a mixed material, adding urea and an activated compound microbial inoculum into the mixed material for composting fermentation, and crushing and granulating the fermented material to obtain the compound organic fertilizer.
7. The preparation method according to claim 6, wherein the activation method of the complex microbial inoculum is as follows: adding a strain mixture with the total effective viable count of more than or equal to 100 hundred million/g into water at the temperature of 25-30 ℃, sealing and standing for 8-12h, wherein the mass ratio of the strain mixture to the water is 1: 90-110.
8. The method according to claim 6, wherein the C/N ratio in the mixed material is 20 to 25.
9. The method according to claim 6, wherein the granulation method comprises: adding a binder containing 8% of polyvinyl alcohol solution in mass percent into the crushed materials, uniformly mixing, granulating, and drying to obtain the granular composite organic fertilizer with the water content of less than 15%.
CN202011237054.1A 2020-11-09 2020-11-09 Pig farm wastewater MAP precipitated sludge and edible fungus residue composite organic fertilizer and preparation method thereof Pending CN112341278A (en)

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CN113785735A (en) * 2021-10-26 2021-12-14 江西省农业科学院土壤肥料与资源环境研究所 Cultivation method of gardenia jasminoides

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