CN115677388A - Method for converting livestock and poultry manure into humic acid fertilizer and saline-alkali soil conditioner - Google Patents
Method for converting livestock and poultry manure into humic acid fertilizer and saline-alkali soil conditioner Download PDFInfo
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- CN115677388A CN115677388A CN202211342313.6A CN202211342313A CN115677388A CN 115677388 A CN115677388 A CN 115677388A CN 202211342313 A CN202211342313 A CN 202211342313A CN 115677388 A CN115677388 A CN 115677388A
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- Prior art keywords
- saline
- humic acid
- soil conditioner
- alkali soil
- livestock
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- 239000010871 livestock manure Substances 0.000 title claims abstract description 64
- 239000003337 fertilizer Substances 0.000 title claims abstract description 60
- 239000004021 humic acid Substances 0.000 title claims abstract description 59
- 210000003608 fece Anatomy 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000003516 soil conditioner Substances 0.000 title claims abstract description 32
- 239000003513 alkali Substances 0.000 title claims abstract description 31
- 244000144972 livestock Species 0.000 title claims abstract description 22
- 244000144977 poultry Species 0.000 title claims abstract description 20
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 title claims description 38
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 52
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000000292 calcium oxide Substances 0.000 claims abstract description 45
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000007787 solid Substances 0.000 claims abstract description 38
- 238000001035 drying Methods 0.000 claims abstract description 26
- -1 humic acid compound Chemical class 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 20
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 17
- 239000003054 catalyst Substances 0.000 claims abstract description 17
- 238000013329 compounding Methods 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 235000015097 nutrients Nutrition 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 11
- 238000003421 catalytic decomposition reaction Methods 0.000 claims abstract description 6
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 5
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 87
- 239000000047 product Substances 0.000 claims description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 49
- 239000011574 phosphorus Substances 0.000 claims description 38
- 229910052698 phosphorus Inorganic materials 0.000 claims description 38
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 239000002244 precipitate Substances 0.000 claims description 19
- 238000002386 leaching Methods 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 16
- 239000010902 straw Substances 0.000 claims description 14
- 238000001354 calcination Methods 0.000 claims description 13
- 238000001704 evaporation Methods 0.000 claims description 13
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 8
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 8
- 235000011151 potassium sulphates Nutrition 0.000 claims description 8
- 238000007873 sieving Methods 0.000 claims description 8
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 8
- 235000011152 sodium sulphate Nutrition 0.000 claims description 8
- 238000011049 filling Methods 0.000 claims description 7
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 6
- 239000005751 Copper oxide Substances 0.000 claims description 6
- 241000196324 Embryophyta Species 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 240000008042 Zea mays Species 0.000 claims description 6
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 6
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 6
- 229910000431 copper oxide Inorganic materials 0.000 claims description 6
- 235000005822 corn Nutrition 0.000 claims description 6
- 235000007164 Oryza sativa Nutrition 0.000 claims description 4
- 241000209140 Triticum Species 0.000 claims description 4
- 235000021307 Triticum Nutrition 0.000 claims description 4
- 235000009566 rice Nutrition 0.000 claims description 4
- 239000005749 Copper compound Substances 0.000 claims description 3
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 3
- 150000001880 copper compounds Chemical class 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 229910052723 transition metal Inorganic materials 0.000 claims description 3
- 150000003624 transition metals Chemical class 0.000 claims description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 2
- 230000001376 precipitating effect Effects 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 10
- 238000004064 recycling Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 241001465754 Metazoa Species 0.000 abstract description 2
- 238000003915 air pollution Methods 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 24
- 239000002689 soil Substances 0.000 description 21
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 20
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 19
- 239000011591 potassium Substances 0.000 description 19
- 229910052700 potassium Inorganic materials 0.000 description 19
- 239000000126 substance Substances 0.000 description 17
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 12
- 239000000920 calcium hydroxide Substances 0.000 description 12
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 12
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 10
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 10
- 229910001424 calcium ion Inorganic materials 0.000 description 10
- 238000001179 sorption measurement Methods 0.000 description 10
- 239000002245 particle Substances 0.000 description 9
- 238000005469 granulation Methods 0.000 description 8
- 230000003179 granulation Effects 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- 241000272525 Anas platyrhynchos Species 0.000 description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 5
- 241001494479 Pecora Species 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 description 5
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 241000287828 Gallus gallus Species 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 4
- 238000005119 centrifugation Methods 0.000 description 4
- 238000000855 fermentation Methods 0.000 description 4
- 230000004151 fermentation Effects 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 4
- 238000010335 hydrothermal treatment Methods 0.000 description 4
- 229910017604 nitric acid Inorganic materials 0.000 description 4
- 241000209094 Oryza Species 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- CUPCBVUMRUSXIU-UHFFFAOYSA-N [Fe].OOO Chemical compound [Fe].OOO CUPCBVUMRUSXIU-UHFFFAOYSA-N 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910021519 iron(III) oxide-hydroxide Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000004332 deodorization Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000028327 secretion Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
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- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
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- Fertilizers (AREA)
Abstract
The invention belongs to the technical field of animal husbandry waste resource recycling, and discloses a method for converting livestock and poultry manure into a humic acid compound fertilizer and a saline-alkali soil conditioner. The method for converting the livestock and poultry manure into the humic acid compound fertilizer and the saline-alkali soil conditioner comprises the following steps: taking the livestock and poultry manure, and adding calcium oxide, sulfate and a catalyst for reaction; carrying out solid-liquid separation after roasting, catalytic decomposition and hydrothermal reaction; drying and granulating the liquid or directly compounding to obtain the humic acid compound fertilizer containing nutrient elements; and adjusting the pH value of the solid residue to obtain the saline-alkali soil conditioner. The method of the invention utilizes the self-heat release of the calcium oxide, reduces the production cost, has simple process, achieves the purpose of utilizing the livestock and poultry manure as a whole resource, and reduces the air pollution.
Description
Technical Field
The invention belongs to the technical field of animal husbandry waste resource recycling, and particularly relates to a method for converting livestock and poultry manure into a humic acid fertilizer and a saline-alkali soil conditioner.
Background
The treatment of the livestock manure is a great problem and contains nitrogen, phosphorus, potassium and other trace elements. Improper disposal can place a great deal of stress on the surrounding ecological environment and the living environment of the inhabitants. The current treatment methods are divided into composting and fermentation, and fermentation is divided into aerobic biological treatment and anaerobic biological treatment. The advantages and the disadvantages of various methods are comprehensively compared, wherein anaerobic biological treatment is the optimal choice. Therefore, many livestock breeding bases adopt the method to treat the livestock excrement. However, the method can generate a large amount of biogas slurry, the method for treating the biogas slurry comprises methods of irrigating and fertilizing fields, soaking seeds in the biogas slurry and the like, although the method has the advantages of preventing soil hardening, saving chemical fertilizer and the like, the method also has some inevitable defects, such as bad smell of the biogas slurry, influence on attractiveness due to dirty color and no treatment, and nutrient substances contained in the biogas slurry are difficult to be fully utilized by plants. If the fertilizing amount is too large, the fertilizer cannot be absorbed by plants, and the residual biogas slurry can cause secondary pollution and the like. How to properly treat and utilize resources is a research focus of many scholars.
In recent years, methods for treating livestock manure emerge in succession. Zhengshajun, hanliang, wu-Qichuan developed a method for rapidly treating excrements of livestock and poultry (Chinese patent publication No. CN 113816779A), which comprises pretreatment, proportioning, standing, mixing, static fermentation, stirring, drying, cooling, generation of unpleasant odor in the process, no sterilization, deodorization, inconvenience in collection of microbial secretion, large energy consumption, high production cost and failure of actual productivity.
A livestock manure treatment method (Chinese patent publication No. CN 114230090A) is developed by the prosperous army and is long in fermentation time, high in operation cost, complex in maintenance and management, high in energy consumption and steel consumption, complex in sediment comprehensive utilization problem, and incapable of forming market competitiveness.
Aiming at the current situation of treatment and resource utilization of the livestock manure, the method for resource utilization of the livestock manure is provided, which partially solves the problem of harm of the livestock manure to the environment, but has high product cost and complex preparation process and needs to be further improved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention mainly aims to provide a method for converting livestock and poultry manure into humic acid fertilizer and saline-alkali soil conditioner by utilizing self-heat release.
The invention also aims to provide the humic acid fertilizer and the saline-alkali soil conditioner prepared by the method.
The purpose of the invention is realized by the following scheme:
a method for converting livestock and poultry manure into a humic acid fertilizer and a saline-alkali soil conditioner is characterized by comprising the following steps:
(1) Mixing fowl and livestock feces with calcium oxide and sulfate, adding water, and stirring;
(2) Adding a catalyst into the step (1) to perform reaction;
(3) Evaporating and drying the product obtained in the step (2), and then roasting, catalyzing and decomposing;
(4) Adding water into the step (3) to carry out hydrothermal reaction;
(5) Cooling the product obtained in the step (4) and then carrying out solid-liquid separation;
(6) Drying and granulating the liquid obtained in the step (5) to obtain a humic acid fertilizer or directly compounding to obtain a humic acid compound fertilizer containing nutrient elements;
(7) And (5) adjusting the pH value of the solid residue obtained in the step (5) to obtain the saline-alkali soil conditioner.
The livestock manure in the step (1) comprises at least one of pig manure, cow manure, sheep manure, chicken manure and duck manure; the sulfate is potassium sulfate or sodium sulfate.
The mass ratio of the livestock and poultry manure to the calcium oxide in the step (1) is 1.1-0.2; the mass ratio of the livestock manure to the sulfate is 1.
The poultry and livestock manure in the step (1) is preferably crushed manure, and the finer the manure is, the easier the manure is to be uniformly mixed; wherein the particle size of the calcium oxide is 0.5-1 cm;
the water adding device in the step (1) is a sprayer, and the water spraying speed is 100-200 mL/s; the relation between the water addition amount and the feces is 150-200 mL/kg, namely 150-200 mL of water is added into each kg of feces; the stirring time is 2-3 h.
The stirring in the step (1) is carried out at the temperature of 200-300 ℃.
The catalyst in the step (2) is at least one of transition metal iron and copper compound; preferably at least one of nano ferric oxide, nano copper oxide, hydroxyl ferric oxide and ferric chloride;
the dosage of the catalyst in the step (2) meets the following requirements: the mass ratio of the livestock and poultry manure to the catalyst is 1:0.01 to 0.02.
The reaction time in the step (2) is 5-8 h; the reaction temperature is 200-300 ℃.
The temperature of the evaporation drying in the step (3) is 70-80 ℃; the temperature of roasting, catalyzing and decaying is 200-350 ℃; the roasting catalytic decomposition time is 2-3 h; the roasting catalytic decomposition is carried out in nitrogen or inert atmosphere.
The water consumption in the step (4) meets the following requirements: the relationship between the water consumption and the feces is 150-200 mL/kg, namely 150-200 mL of water is added into each kg of feces.
The hydrothermal reaction temperature in the step (4) is 120-220 ℃; the time is 2 to 6 hours; the filling degree is 50-80%.
The granulation in the step (6) comprises the following steps: prepressing, conveying, rolling, crushing and granulating.
The raw materials compounded with the liquid obtained in the step (5) in the step (6) comprise at least one of plant ash, wheat straw, rice straw and corn straw; the nutrient elements in the step (6) comprise: at least one of nitrogen, phosphorus, potassium, sodium, silicon, calcium, magnesium, boron, sulfur and manganese.
Adjusting the pH value to 5-6.5 in the step (7); the reagent for adjusting pH comprises at least one of sulfuric acid and nitric acid.
A humic acid fertilizer and a saline-alkali soil conditioner prepared by the method.
The method for further preparing the high-phosphorus fertilizer product by using the saline-alkali soil conditioner obtained in the step (7) comprises the following steps:
and (5) crushing the solid residue obtained in the step (7), sieving, leaching, precipitating, centrifuging, and drying and calcining the precipitate to obtain the high-phosphorus fertilizer product.
Sieving the solid residue powder by a sieve of 100-200 meshes;
the leaching is performed by using citric acid solution, the concentration of the citric acid solution is 0.1-0.2 mol/L, the dosage of the citric acid solution meets the requirement that the pH value of the leaching solution is controlled to be 5-6, and the leaching time is 2-3 h;
the precipitation is to add calcium oxide into the leachate, wherein the addition amount of the calcium oxide meets the requirement that the leachate is precipitated by controlling the pH value to be 10-11; the calcining temperature is 100-130 ℃; the calcination time is 10-12 h.
The mechanism of the invention is as follows:
the water content is used for avoiding the drying and pretreatment processes of the livestock and poultry manure; the calcium oxide is added to generate calcium hydroxide, a large amount of heat is released in the process, and the calcium oxide is in a small granular shape and can be fully contacted with the livestock manure, so that the released heat is combined with the livestock manure, and the livestock manure is quickly decomposed. The calcium hydroxide is alkaline, so that the poultry and livestock manure can be quickly converted into humic acid. The potassium sulfate or sodium sulfate is added for providing potassium element and sodium element for the later humate, and one of transition metal iron and copper compounds is used as a catalyst, so that the catalyst has small particle size, low density and high reaction activity, and is beneficial to chemical reaction. After the water heating is finished, carrying out solid-liquid separation, wherein the liquid is high-added-value humic acid fertilizer (containing silicon, nitrogen, phosphorus and other nutrient elements dissolved out from the livestock and poultry manure), and granulating according to needs to obtain the humic acid fertilizer or directly compounding to obtain the humic acid compound fertilizer containing the nutrient elements; the solid residue is a compound fertilizer containing calcium sulfate, part of biochar and undissolved potassium humate, sulfuric acid or nitric acid is added, the pH is adjusted to 5-6.5, and the calcium sulfate-based saline-alkali soil conditioner rich in humic acid can be obtained. In order to realize selective leaching of phosphorus, solid residues are crushed, and citric acid solution is selected as a leaching agent. Adding calcium oxide and water again to raise the pH of the solution and form a large amount of precipitate, recovering the precipitate, drying and calcining to obtain a phosphate product.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention aims to provide a technology for recycling livestock manure, which utilizes a simple process to efficiently utilize the livestock manure, reduces the production cost, obtains a humic acid fertilizer and a saline-alkali soil conditioner, and explores a technology for recycling the livestock manure, which has the advantages of low raw material cost, low energy consumption, good economic benefit and environmental protection through repeated experimental research. The method is characterized in that the livestock and poultry manure is simply subjected to catalytic decomposition treatment by adding calcium oxide, calcium humate base salt is generated under an alkaline condition, and other elements are respectively added after filtration and separation to obtain the humic acid compound fertilizer and the saline-alkali soil conditioner, so that the aim of utilizing the livestock and poultry manure as a whole resource is fulfilled, the air pollution is reduced, the utilization rate is high, and the fertilizer and the soil conditioner are respectively prepared.
Drawings
FIG. 1 is a technical scheme of the present invention.
FIG. 2 is an XRD pattern of potassium humate obtained after granulation in example 1 of the present invention.
FIG. 3 is a scanning electron micrograph of potassium humate obtained after granulation in example 1 of the present invention.
FIG. 4 is an infrared spectrum of potassium humate obtained after granulation in example 1 of the present invention.
Fig. 5 is an appearance diagram of the humic acid compound fertilizer obtained after granulation in example 1 of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure of the present invention. The invention is capable of other and different embodiments and its several details are capable of modifications and variations in various respects, all without departing from the spirit of the invention.
Before the present embodiments are further described, it is to be understood that the scope of the invention is not limited to the particular embodiments described below; also, the terminology used in the examples herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
When numerical ranges are given in the examples, unless otherwise stated herein, both endpoints of each numerical range and any number between the endpoints are optional. And 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.
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The reagents used in the examples are commercially available without specific reference.
Example 1
(1) Taking 50kg of pig manure, crushing large substances in the pig manure, and adding the following components: calcium oxide (particle size 1 cm) with calcium oxide mass ratio of 1: and (2) adding water into the sodium sulfate according to the mass ratio of 1 to 0.2 by using a sprayer, wherein the water spraying speed is 200mL/s, the relation between the water adding amount and the pig manure is 200mL/kg, and fully stirring for 3 hours to uniformly mix the sodium sulfate. The temperature is controlled at 300 ℃ by an infrared temperature measuring and heat preserving device.
(2) Adding the product obtained in step (1): and (3) reacting for 6 hours with nano copper oxide (catalyst) mass ratio of 1.
(3) Evaporating and drying the product obtained in the step (2) at 80 ℃ after the reaction is finished, and then roasting, catalyzing and decomposing the product for 3 hours at 300 ℃ in nitrogen.
(4) 8000mL of water is added into the mixture obtained in the step (3), and the mixture is hydrothermally treated at 150 ℃ for 2h, wherein the filling degree is 60%.
(5) And (4) cooling, performing solid-liquid separation, and drying and granulating the liquid (including prepressing and conveying, rolling and forming, and crushing and granulating) to obtain the humic acid fertilizer or directly compounding plant ash to obtain the humic acid compound fertilizer containing nutrient elements. From the XRD pattern, scanning electron micrograph and infrared spectrogram of FIGS. 2-4, it can be seen that the obtained sample contains potassium humate. According to the determination (gravimetric method) of the content of the soluble humic acid in GB/T33804-2017 potassium humate for agriculture, the granulated product and the product obtained by compounding plant ash both meet the standard of GB/T33804-2017 potassium humate for agriculture.
TABLE 1 Standard test results of GB/T33804-2017 potassium humate for agricultural use of the granulated product of example 1
(6) Adding sulfuric acid to the solid residue obtained in the step (5) to adjust the pH to 6. Calcium oxide and sulfate are added in the early stage, wherein calcium oxide and water generate calcium hydroxide, and after the pH is adjusted by acid, a part of calcium ions of the calcium hydroxide are combined with the sulfate to form calcium sulfate. Calcium sulfate can react with carbonate ions in alkaline soil to generate insoluble calcium carbonate, so that the alkalinity of the soil can be reduced to a certain extent; meanwhile, the solid residue contains partial undissolved humic acid which can be combined with calcium ions in calcium sulfate to promote the formation of large granular aggregate structure of the fine granular soil on the ground surface, thereby reducing the capillary phenomenon of the fine granular soil and greatly reducing the salinization caused by the evaporation of water carrying salt to the ground surface and gradual accumulation. Therefore, the product containing humic acid and calcium sulfate obtained by adjusting the pH of the solid residue with sulfuric acid can be used as a saline-alkali soil conditioner.
(7) And (5) crushing the solid residue obtained in the step (6), sieving the crushed solid residue with a 100-mesh sieve, adding 0.1mol/L of citric acid solution into the leachate until the pH value is controlled to be 5, and mechanically stirring the leachate for 200r/min for 2h. And adding calcium oxide and water into the leachate, wherein the addition amount of the calcium oxide meets the requirement that the pH value of the leachate is controlled to 10, so that a large amount of precipitate is generated in the leachate. Then, the cloudy leachate was allowed to stand for 2 hours to allow the solution to separate into layers, and the precipitate was recovered by centrifugation. And finally, drying and calcining the precipitate at 100 ℃ for 12 hours to obtain the high-phosphorus fertilizer product. The decayed excrement contains a large amount of phosphorus, phosphorus is often adsorbed on the solid residues, citric acid belongs to tricarboxylic acid hydroxyl compounds, and due to the influence of p-pi conjugate effect in carboxyl and the active chemical property of the hydroxyl, the citric acid can act with adsorption sites of other substances in advance to inhibit the adsorption of the phosphorus, so that the phosphorus cannot be adsorbed by the residues in the citric acid leaching process and is dispersed in leachate, and a high-phosphorus fertilizer product can be obtained.
Example 2
(1) Taking 50kg of sheep manure, crushing large substances in the sheep manure, and adding the following materials: calcium oxide (particle size of 0.5 cm) with calcium oxide mass ratio of 1: sodium sulfate with the mass ratio of sodium sulfate to 1:0.1, adding water by using a sprayer, wherein the water spraying speed is 100mL/s, the relation between the added water amount and sheep manure is 150mL/kg, m, and fully stirring for 2h to uniformly mix the sodium sulfate and the sheep manure. The temperature is controlled at 200 ℃ by an infrared temperature measurement and heat preservation device.
(2) Adding the product obtained in step (1): and (3) reacting the nano iron oxide (catalyst) for 5 hours, wherein the mass ratio of the nano iron oxide to the nano iron oxide (catalyst) is 1.
(3) Evaporating and drying the product obtained in the step (2) at 70 ℃, and roasting and catalyzing for decomposition for 2 hours at 200 ℃ in nitrogen.
(4) Adding 7500mL of water into the mixture obtained in the step (3), and carrying out hydrothermal treatment at 120 ℃ for 4h, wherein the filling degree is 50%;
(5) And (4) cooling, performing solid-liquid separation, drying and granulating the liquid to obtain the humic acid fertilizer (comprising prepressing conveying, rolling forming and crushing granulation) or directly compounding the humic acid fertilizer with wheat straws to obtain the humic acid compound fertilizer containing nutrient elements. According to the determination (weight method) of the content of the soluble humic acid in GB/T33804-2017 agricultural potassium humate, the granulated product and the product obtained by compounding the wheat straw all meet the standard of GB/T33804-2017 agricultural potassium humate.
(6) Adding nitric acid to the solid residue obtained in the step (5) to adjust the pH to 5. Calcium oxide and sulfate are added in the early stage, wherein calcium oxide and water generate calcium hydroxide, and after the pH is adjusted by acid, a part of calcium ions of the calcium hydroxide are combined with the sulfate to form calcium sulfate. Calcium sulfate can react with carbonate ions in alkaline soil to generate insoluble calcium carbonate, so that the alkalinity of the soil can be reduced to a certain extent; meanwhile, the solid residue contains partial undissolved humic acid which can be combined with calcium ions in calcium sulfate to promote the formation of large granular aggregate structure of the fine granular soil on the ground surface, thereby reducing the capillary phenomenon of the fine granular soil and greatly reducing the salinization caused by the evaporation of water carrying salt to the ground surface and gradual accumulation. Therefore, the product containing humic acid and calcium sulfate obtained by adjusting the pH of the solid residue with sulfuric acid can be used as a saline-alkali soil conditioner.
(7) And (4) crushing the solid residue obtained in the step (6), sieving the crushed solid residue with a 200-mesh sieve, adding 0.2mol/L of citric acid solution into the leachate to control the pH value to be 6, and mechanically stirring the leachate for 300r/min for 3h. And adding calcium oxide and water into the leachate again, wherein the addition amount of the calcium oxide meets the requirement that the pH value of the leachate is 11, so that a large amount of precipitates are generated in the leachate. Then, the cloudy leachate was allowed to stand for 2 hours to allow the solution to separate into layers, and the precipitate was recovered by centrifugation. And finally, drying and calcining the precipitate at the temperature of 120 ℃ for 11h to obtain the high-phosphorus fertilizer product. The decayed excrement contains a large amount of phosphorus, phosphorus is often adsorbed on the solid residues, citric acid belongs to tricarboxylic acid hydroxyl compounds, and due to the influence of p-pi conjugate effect in carboxyl and the active chemical property of the hydroxyl, the citric acid can act with adsorption sites of other substances in advance to inhibit the adsorption of the phosphorus, so that the phosphorus cannot be adsorbed by the residues in the citric acid leaching process and is dispersed in leachate, and a high-phosphorus fertilizer product can be obtained.
Example 3
(1) Taking 50kg of cow dung, crushing large substances in the cow dung, adding the following components: calcium oxide (particle size about 1 cm) at a calcium oxide mass ratio of 1: and (2) adding water into the potassium sulfate according to the mass ratio of 1. The temperature is controlled at 200 ℃ by an infrared temperature measurement and heat preservation device.
(2) Adding the product obtained in step (1): ferric chloride (catalyst) mass ratio 1.01, and the reaction was carried out for 6 hours.
(3) Evaporating and drying the obtained product in the step (2) at 70 ℃ after the reaction is finished, and then roasting, catalyzing and decomposing the product for 3 hours in nitrogen at 350 ℃.
(4) Adding 8000mL of water obtained in the step (3), and carrying out hydrothermal treatment at 180 ℃ for 2h, wherein the filling degree is 70%;
(5) And (4) cooling, performing solid-liquid separation, and drying and granulating the liquid (including prepressing conveying, rolling forming and crushing granulation) to obtain the humic acid fertilizer or directly compounding the humic acid fertilizer with rice straws to obtain the humic acid compound fertilizer containing nutrient elements. According to the determination (weight method) of the content of the soluble humic acid in GB/T33804-2017 agricultural potassium humate, the granulated product and the product obtained by compounding the rice straw all meet the GB/T33804-2017 agricultural potassium humate standard.
(6) Adding sulfuric acid to the solid residue obtained in the step (5) to adjust the pH to 6.5. Calcium oxide and sulfate are added in the early stage, wherein calcium oxide and water generate calcium hydroxide, and after the pH is adjusted by acid, a part of calcium ions of the calcium hydroxide are combined with the sulfate to form calcium sulfate. Calcium sulfate can react with carbonate ions in alkaline soil to generate insoluble calcium carbonate, so that the alkalinity of the soil can be reduced to a certain extent; meanwhile, the solid residue contains partial undissolved humic acid which can be combined with calcium ions in calcium sulfate to promote the fine-particle soil on the ground surface to form a large-particle aggregate structure, so that the capillary phenomenon of the fine-particle soil is reduced, and the salinization caused by the evaporation of water carrying salt to the ground surface and the gradual accumulation is greatly reduced. Therefore, the product containing humic acid and calcium sulfate obtained by adjusting the pH of the solid residue with sulfuric acid can be used as a saline-alkali soil conditioner.
(7) And (4) crushing the solid residue obtained in the step (6), sieving the crushed solid residue with a 100-mesh sieve, adding 0.1mol/L of citric acid solution into the leachate to control the pH value to be 5, and mechanically stirring the leachate for 300r/min for 2h. And adding calcium oxide and water into the leachate again, wherein the addition amount of the calcium oxide meets the pH value of the leachate to 10, so that a large amount of precipitate is generated in the leachate. Then, the cloudy leachate was allowed to stand for 2 hours to allow the solution to separate into layers, and the precipitate was recovered by centrifugation. And finally, drying and calcining the precipitate at the temperature of 130 ℃ for 10 hours to obtain the high-phosphorus fertilizer product. The solid residue contains a large amount of phosphorus after being decomposed, phosphorus is often adsorbed on the residue, citric acid belongs to tricarboxylic acid hydroxyl compounds, and due to the influence of a p-pi conjugated effect in carboxyl and the active chemical property of the hydroxyl, the citric acid can act in advance with adsorption sites of other substances to inhibit the adsorption of the phosphorus, so that the phosphorus cannot be adsorbed by the residue to be dispersed in a leachate in the citric acid leaching process, and a high-phosphorus fertilizer product can be obtained.
Example 4
(1) Taking 50kg of chicken manure, crushing large substances in the chicken manure, adding the following components: calcium oxide (particle size about 0.5 cm) at a calcium oxide mass ratio of 1: adding water into potassium sulfate in a mass ratio of 1:0.1 by using a sprayer, wherein the water spraying speed is 200mL/s, the relation between the water adding amount and the chicken manure is 150mL/Kg, and fully stirring for 3 hours to uniformly mix the potassium sulfate. The temperature is controlled at 300 ℃ by an infrared temperature measuring and heat preserving device.
(2) Adding the product obtained in step (1): iron oxyhydroxide (catalyst) mass ratio 1.02 iron oxyhydroxide, reaction for 7h.
(3) Evaporating and drying the product obtained in the step (2) at 80 ℃ after the reaction is finished, and then roasting, catalyzing and decomposing the product for 2 hours at 300 ℃ in nitrogen.
(4) Adding 7500mL of water into the mixture obtained in the step (3), and carrying out hydrothermal treatment at 200 ℃ for 6h, wherein the filling degree is 80%;
(5) And (4) cooling, performing solid-liquid separation, and drying and granulating the liquid (including prepressing and conveying, rolling and forming, crushing and granulating) to obtain the humic acid fertilizer or directly compounding the humic acid fertilizer with corn straws to obtain the humic acid compound fertilizer containing nutrient elements. According to the determination (weight method) of the content of the soluble humic acid in GB/T33804-2017 agricultural potassium humate, the granulated product and the product obtained by compounding the corn straw all meet the GB/T33804-2017 agricultural potassium humate standard.
(6) Adding nitric acid to the solid residue obtained in the step (5) to adjust the pH value to 6. Calcium oxide and sulfate are added in the early stage, wherein calcium oxide and water generate calcium hydroxide, and after the pH is adjusted by acid, a part of calcium ions of the calcium hydroxide are combined with the sulfate to form calcium sulfate. Calcium sulfate can react with carbonate ions in alkaline soil to generate insoluble calcium carbonate, so that the alkalinity of the soil can be reduced to a certain extent; meanwhile, the solid residue contains partial undissolved humic acid which can be combined with calcium ions in calcium sulfate to promote the formation of large granular aggregate structure of the fine granular soil on the ground surface, thereby reducing the capillary phenomenon of the fine granular soil and greatly reducing the salinization caused by the evaporation of water carrying salt to the ground surface and gradual accumulation. Therefore, the product containing humic acid and calcium sulfate obtained by adjusting the pH of the solid residue with sulfuric acid can be used as a saline-alkali soil conditioner.
(7) And (4) crushing the solid residue obtained in the step (6), sieving the crushed solid residue with a 200-mesh sieve, adding 0.2mol/L of leachate citric acid solution, controlling the pH value to be 6, and mechanically stirring for 200r/min for 3h. And adding calcium oxide and water again into the leachate, wherein the addition amount of the calcium oxide meets the requirement that the pH value of the leachate is controlled to be 11, so that a large amount of precipitates are generated in the leachate. Then, the cloudy leachate was allowed to stand for 2 hours to allow the solution to separate into layers, and the precipitate was recovered by centrifugation. And finally, drying and calcining the precipitate at 100 ℃ for 13h to obtain the high-phosphorus fertilizer product. The decayed excrement contains a large amount of phosphorus, phosphorus is often adsorbed on the solid residues, citric acid belongs to tricarboxylic acid hydroxyl compounds, and due to the influence of p-pi conjugate effect in carboxyl and the active chemical property of the hydroxyl, the citric acid can act with adsorption sites of other substances in advance to inhibit the adsorption of the phosphorus, so that the phosphorus cannot be adsorbed by the residues in the citric acid leaching process and is dispersed in leachate, and a high-phosphorus fertilizer product can be obtained.
Example 5
(1) Taking 50kg of duck manure, crushing large substances in the duck manure, and adding the duck manure: calcium oxide (particle size about 1 cm) with calcium oxide mass ratio of 1: adding water into potassium sulfate in a mass ratio of 1:0.1 by using a sprayer, wherein the water spraying speed is 100mL/s, the relation between the water adding amount and the duck manure is 150mL/Kg, and fully stirring for 2 hours to uniformly mix the potassium sulfate. The temperature is controlled at 200 ℃ by an infrared temperature measurement and heat preservation device.
(2) Adding the product obtained in step (1): and (3) reacting the nano copper oxide (catalyst) for 8 hours, wherein the mass ratio of the nano copper oxide to the nano copper oxide is 1.01.
(3) Evaporating and drying the obtained product in the step (2) at 70 ℃ after the reaction is finished, and then roasting, catalyzing and decomposing the product for 3 hours in nitrogen at 350 ℃.
(4) Adding 8000mL of water obtained in the step (3), and carrying out hydrothermal treatment at 220 ℃ for 2h, wherein the filling degree is 70%;
(5) And (5) cooling the obtained product in the step (4), performing solid-liquid separation, and drying and granulating the liquid (including prepressing conveying, rolling forming and crushing granulation) to obtain the humic acid fertilizer or directly compounding the humic acid fertilizer with corn straws to obtain the humic acid compound fertilizer containing nutrient elements. According to the determination (gravimetric method) of the content of the soluble humic acid in GB/T33804-2017 potassium humate for agriculture, the granulated product and the product obtained by compounding the corn straw all meet the GB/T33804-2017 potassium humate for agriculture standard.
(6) Adding sulfuric acid to the solid residue obtained in the step (5), and adjusting the pH to 6.5. Calcium oxide and sulfate are added in the early stage, wherein calcium oxide and water generate calcium hydroxide, and after the pH is adjusted by acid, a part of calcium ions of the calcium hydroxide are combined with the sulfate to form calcium sulfate. Calcium sulfate can react with carbonate ions in alkaline soil to generate insoluble calcium carbonate, so that the alkalinity of the soil can be reduced to a certain extent; meanwhile, the solid residue contains partial undissolved humic acid which can be combined with calcium ions in calcium sulfate to promote the fine-particle soil on the ground surface to form a large-particle aggregate structure, so that the capillary phenomenon of the fine-particle soil is reduced, and the salinization caused by the evaporation of water carrying salt to the ground surface and the gradual accumulation is greatly reduced. Therefore, the product containing humic acid and calcium sulfate obtained by adjusting the pH of the solid residue with sulfuric acid can be used as a saline-alkali soil conditioner.
(7) Crushing the solid residue obtained in the step (6), sieving the crushed solid residue with a 100-mesh sieve, adding 0.1mol/L of leachate citric acid solution, controlling the pH value to be 5, mechanically stirring the leachate citric acid solution for 200r/min, and leaching the leachate citric acid solution for 2 hours 。 And adding calcium oxide and water again into the leachate, wherein the addition amount of the calcium oxide meets the requirement that the pH value of the leachate is controlled to be 11, so that a large amount of precipitates are generated in the leachate. Then, the cloudy leachate was left for 2 hours to allow the solution to standAnd (4) layering, and recovering the precipitate through centrifugal separation. And finally, drying and calcining the precipitate at the temperature of 120 ℃ for 11 hours to obtain the high-phosphorus fertilizer product. The decayed excrement contains a large amount of phosphorus, phosphorus is often adsorbed on the solid residues, citric acid belongs to tricarboxylic acid hydroxyl compounds, and due to the influence of p-pi conjugate effect in carboxyl and the active chemical property of the hydroxyl, the citric acid can act with adsorption sites of other substances in advance to inhibit the adsorption of the phosphorus, so that the phosphorus cannot be adsorbed by the residues in the citric acid leaching process and is dispersed in leachate, and a high-phosphorus fertilizer product can be obtained.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A method for converting livestock and poultry manure into a humic acid compound fertilizer and a saline-alkali soil conditioner is characterized by comprising the following steps:
(1) Mixing fowl and livestock feces with calcium oxide and sulfate, adding water, and stirring;
(2) Adding a catalyst into the step (1) to perform reaction;
(3) Evaporating and drying the product obtained in the step (2), and then roasting, catalyzing and decomposing;
(4) Adding water into the step (3) to carry out hydrothermal reaction;
(5) Cooling the product obtained in the step (4) and then carrying out solid-liquid separation;
(6) Drying and granulating the liquid obtained in the step (5) or directly compounding to obtain the humic acid compound fertilizer containing nutrient elements;
(7) And (5) adjusting the pH value of the solid residue obtained in the step (5) to obtain the saline-alkali soil conditioner.
2. The method for converting livestock manure into the humic acid compound fertilizer and the saline-alkali soil conditioner according to claim 1, which is characterized in that: the sulfate in the step (1) is potassium sulfate or sodium sulfate; the mass ratio of the livestock manure to the sulfate is 1.
3. The method for converting livestock manure into the humic acid compound fertilizer and the saline-alkali soil conditioner according to claim 1, which is characterized in that: the mass ratio of the livestock manure and the calcium oxide in the step (1) is 1.
4. The method for converting livestock manure into the humic acid compound fertilizer and the saline-alkali soil conditioner according to claim 1, which is characterized in that:
the relation between the water adding amount and the feces in the step (1) is 150-200 mL/kg, namely 150-200 mL of water is added into each kg of feces;
the stirring in the step (1) is controlled at the temperature of 200-300 ℃; the stirring time is 2-3 h.
5. The method for converting livestock manure into the humic acid compound fertilizer and the saline-alkali soil conditioner according to claim 1, which is characterized in that:
the catalyst in the step (2) is at least one of transition metal iron and copper compound; preferably at least one of nano ferric oxide, nano copper oxide, hydroxyl ferric oxide and ferric chloride;
the dosage of the catalyst satisfies the following conditions: the mass ratio of the livestock and poultry manure to the catalyst is 1:0.01 to 0.02;
the reaction time in the step (2) is 5-8 h; the reaction temperature is 200-300 ℃.
6. The method for converting livestock manure into the humic acid compound fertilizer and the saline-alkali soil conditioner according to claim 1, which is characterized in that:
the temperature of roasting, catalyzing and decomposing in the step (3) is 200-350 ℃; the roasting catalytic decomposition time is 2-3 h; the calcination catalytic decomposition is carried out in nitrogen or inert atmosphere.
7. The method for converting livestock manure into the humic acid compound fertilizer and the saline-alkali soil conditioner according to claim 1, which is characterized in that: the hydrothermal reaction temperature in the step (4) is 120-220 ℃; the time is 2 to 6 hours; the filling degree is 50-80%.
8. The method for converting livestock manure into the humic acid compound fertilizer and the saline-alkali soil conditioner according to claim 1, which is characterized in that:
the raw materials compounded with the liquid obtained in the step (5) in the step (6) comprise at least one of plant ash, wheat straw, rice straw and corn straw;
and (7) adjusting the pH value to 5-6.5.
9. The humic acid fertilizer and the saline-alkali soil conditioner prepared by the method according to any one of claims 1 to 8.
10. A high-phosphorus fertilizer product, which is characterized by being prepared from the saline-alkali soil conditioner as defined in claim 9, and specifically comprising the following steps: crushing the solid residue obtained in the step (7), sieving, leaching, precipitating, centrifuging, drying and calcining the precipitate to obtain a high-phosphorus fertilizer product;
the leaching is performed by using citric acid solution, the concentration of the citric acid solution is 0.1-0.2 mol/L, the dosage of the citric acid solution meets the requirement that the pH value is controlled to be 5-6, and the leaching time is 2-3 h;
the precipitation is to add calcium oxide into the leaching solution for precipitation, wherein the addition amount of the calcium oxide meets the requirement that the pH value of the leaching solution is controlled to be 10-11;
the calcination temperature is 100-130 ℃; the calcination time is 10-12 h.
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