CN110803963A - Method for preparing fertilizer from biogas slurry and biogas residues, fertilizer prepared by method and application of fertilizer - Google Patents
Method for preparing fertilizer from biogas slurry and biogas residues, fertilizer prepared by method and application of fertilizer Download PDFInfo
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- CN110803963A CN110803963A CN201810797216.3A CN201810797216A CN110803963A CN 110803963 A CN110803963 A CN 110803963A CN 201810797216 A CN201810797216 A CN 201810797216A CN 110803963 A CN110803963 A CN 110803963A
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- 239000003337 fertilizer Substances 0.000 title claims abstract description 61
- 239000002002 slurry Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000000855 fermentation Methods 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 16
- 235000015097 nutrients Nutrition 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 238000000926 separation method Methods 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 239000010902 straw Substances 0.000 claims description 11
- 239000005416 organic matter Substances 0.000 claims description 10
- 239000012141 concentrate Substances 0.000 claims description 9
- 244000005700 microbiome Species 0.000 claims description 7
- 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
- 235000005822 corn Nutrition 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 210000003608 fece Anatomy 0.000 claims description 5
- 230000007226 seed germination Effects 0.000 claims description 5
- 239000004254 Ammonium phosphate Substances 0.000 claims description 4
- 244000063299 Bacillus subtilis Species 0.000 claims description 4
- 235000014469 Bacillus subtilis Nutrition 0.000 claims description 4
- 241000894006 Bacteria Species 0.000 claims description 4
- 241001465754 Metazoa Species 0.000 claims description 4
- 229910000148 ammonium phosphate Inorganic materials 0.000 claims description 4
- 235000019289 ammonium phosphates Nutrition 0.000 claims description 4
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 4
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 4
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims description 4
- 239000010903 husk Substances 0.000 claims description 4
- 229940099596 manganese sulfate Drugs 0.000 claims description 4
- 235000007079 manganese sulphate Nutrition 0.000 claims description 4
- 239000011702 manganese sulphate Substances 0.000 claims description 4
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 claims description 4
- 239000010815 organic waste Substances 0.000 claims description 4
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 4
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 4
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 4
- 235000011151 potassium sulphates Nutrition 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 240000003183 Manihot esculenta Species 0.000 claims description 3
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims description 3
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- 239000010871 livestock manure Substances 0.000 claims description 3
- 239000010813 municipal solid waste Substances 0.000 claims description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 3
- 239000010452 phosphate Substances 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 3
- 229960001763 zinc sulfate Drugs 0.000 claims description 3
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 3
- 235000017060 Arachis glabrata Nutrition 0.000 claims description 2
- 244000105624 Arachis hypogaea Species 0.000 claims description 2
- 235000010777 Arachis hypogaea Nutrition 0.000 claims description 2
- 235000018262 Arachis monticola Nutrition 0.000 claims description 2
- 241000589151 Azotobacter Species 0.000 claims description 2
- 241000194108 Bacillus licheniformis Species 0.000 claims description 2
- 235000016068 Berberis vulgaris Nutrition 0.000 claims description 2
- 241000335053 Beta vulgaris Species 0.000 claims description 2
- 244000025254 Cannabis sativa Species 0.000 claims description 2
- 241000196324 Embryophyta Species 0.000 claims description 2
- 229910017053 inorganic salt Inorganic materials 0.000 claims description 2
- 235000021049 nutrient content Nutrition 0.000 claims description 2
- 235000020232 peanut Nutrition 0.000 claims description 2
- 230000000243 photosynthetic effect Effects 0.000 claims description 2
- 235000010333 potassium nitrate Nutrition 0.000 claims description 2
- 239000004323 potassium nitrate Substances 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 239000010802 sludge Substances 0.000 claims description 2
- 230000003381 solubilizing effect Effects 0.000 claims description 2
- 235000013311 vegetables Nutrition 0.000 claims description 2
- 239000002023 wood Substances 0.000 claims description 2
- 241000589180 Rhizobium Species 0.000 claims 1
- 230000035784 germination Effects 0.000 abstract description 12
- 238000003860 storage Methods 0.000 abstract description 6
- 238000002360 preparation method Methods 0.000 description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- DLYUQMMRRRQYAE-UHFFFAOYSA-N tetraphosphorus decaoxide Chemical compound O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 239000002689 soil Substances 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000003895 organic fertilizer Substances 0.000 description 5
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 5
- 229910001950 potassium oxide Inorganic materials 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000004151 fermentation Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 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 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 2
- 150000001413 amino acids Chemical class 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000035558 fertility Effects 0.000 description 2
- 239000004021 humic acid Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 229940044197 ammonium sulfate Drugs 0.000 description 1
- 239000003674 animal food additive Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000008641 drought stress Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 150000007523 nucleic acids Chemical class 0.000 description 1
- 102000039446 nucleic acids Human genes 0.000 description 1
- 108020004707 nucleic acids Proteins 0.000 description 1
- 239000002420 orchard Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 235000013343 vitamin Nutrition 0.000 description 1
- 239000011782 vitamin Substances 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C3/00—Fertilisers containing other salts of ammonia or ammonia itself, e.g. gas liquor
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Fertilizers (AREA)
Abstract
The invention relates to the field of preparing fertilizers by using anaerobic fermentation products of biogas, in particular to a method for preparing fertilizers by using biogas slurry and biogas residues, the fertilizers prepared by the method and application of the fertilizers. The method comprises the following steps: carrying out solid-liquid separation on the anaerobic fermentation product of the biogas to obtain biogas residues and biogas slurry; concentrating the obtained biogas slurry to obtain a concentrated solution; mixing the biogas residue and the concentrated solution and drying; and mixing the obtained dried material with an optional nutrient conditioner to obtain the fertilizer. The invention effectively realizes high-value utilization of the biogas slurry, solves the storage and transportation problems of the biogas slurry, and has the advantages of low investment and simple operation. More importantly, the fertilizer provided by the invention not only can improve the germination rate of seeds, but also effectively shortens the germination time of the seeds, and also obviously improves the drought resistance and waterlogging resistance of crops.
Description
Technical Field
The invention relates to the field of preparing fertilizers by using anaerobic fermentation products of biogas, in particular to a method for preparing fertilizers by using biogas slurry and biogas residues, the fertilizers prepared by the method and application of the fertilizers.
Background
Biogas is formed by organic wastes (such as crop straws, human and animal excreta, domestic garbage, organic wastes, sewage and the like) under the anaerobic condition through the action of specific microorganisms. In the anaerobic fermentation process, most organic matters in the fermentation raw materials are decomposed into various water-soluble substances such as protein, amino acid and the like to form anaerobic fermentation liquid (namely biogas slurry); while the raw materials can not be decomposed by microorganisms or the substances which are not completely decomposed form biogas residues. If the biogas residues and biogas slurry cannot be properly treated, the direct discharge not only causes secondary pollution to the environment, but also is a huge waste of resources. Although the material composition and proportion of the biogas residues and the biogas slurry are different due to different fermentation raw materials, the comprehensive utilization of the biogas residues and the biogas slurry is necessary and feasible. The treatment process of the biogas residues is mature, and the biogas residues can be made into organic fertilizer or organic compound fertilizer after dehydration. At present, biogas slurry treatment approaches are roughly two types: firstly, biochemical treatment, namely degrading pollutants in the wastewater to make the wastewater reach relevant emission standards; and secondly, agricultural resource utilization, namely the biogas slurry is treated and then used for farmland irrigation or used as a foliar fertilizer.
Although the biogas slurry contains rich organic and inorganic nutrient substances and can be used as foliar fertilizer, seed soaking agent, feed additive for animals and the like, the popularization and the application of the biogas slurry are greatly limited due to the characteristics of high water content, difficult storage and transportation, relatively low economic value and the like. When the engineering scale is too large, the produced biogas slurry amount far exceeds the maximum consumption of a local farmland, and the biogas slurry contains higher organic components such as ammonia nitrogen, phosphate, humic acid and the like, and the carbon-nitrogen ratio is seriously unbalanced, so that the biogas slurry becomes wastewater which is difficult to treat, and if the biogas slurry is randomly discharged, the biogas slurry can cause serious damage to the natural environment, particularly the water environment. If the conventional sewage treatment is carried out, the discharge standard can be reached. But the equipment investment is large, the operation cost is high, common small and medium-sized enterprises are difficult to bear, and few enterprises adopt the treatment mode.
At present, most enterprises directly use biogas slurry as liquid fertilizer to irrigate peripheral farmlands or orchards. However, because of the seasonality of cultivation, especially cultivation in one season in northeast of China, a factory must be equipped with a biogas slurry pool large enough for storage, resulting in increased investment; in addition, when the engineering scale is too large, the amount of the produced biogas slurry far exceeds the maximum consumption of the local farmland, so that the capacity of the device is limited; if the application amount is excessive, the water body environment can be polluted. Part of enterprises select to concentrate the biogas slurry and develop foliar fertilizer for sale, but the market capacity is small and the marketing difficulty is high.
In addition, the research on the efficacy of anaerobic fermentation products of biogas is always a subject of great attention by researchers.
Therefore, it is necessary to develop a new process for biogas slurry treatment, which not only has low investment, low running cost and simple operation, but also can realize high-valued multifunctional utilization of active ingredients.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a method for preparing a fertilizer by utilizing biogas slurry and biogas residues, the fertilizer prepared by the method and application of the fertilizer in accelerating seed germination and improving drought and waterlogging resistance of crops.
In order to achieve the above object, a first aspect of the present invention provides a method for preparing a fertilizer using biogas slurry and biogas residue, the method comprising:
(1) carrying out solid-liquid separation on the anaerobic fermentation product of the biogas to obtain biogas residues and biogas slurry;
(2) concentrating the obtained biogas slurry to obtain a concentrated solution;
(3) mixing the biogas residue and the concentrated solution and drying;
(4) and mixing the obtained dried material with an optional nutrient conditioner to obtain the fertilizer.
In a second aspect the invention provides a fertilizer prepared by the method as described above.
In a third aspect of the invention, there is provided the use of a fertilizer as described above for accelerating seed germination and for improving the drought and waterlogging resistance of crops.
According to the invention, after the solid-liquid separation is carried out on the anaerobic fermentation product of the biogas, the obtained biogas slurry is concentrated and then mixed with biogas residues, and then the mixture is dried to prepare the organic fertilizer, so that the high-value utilization of the biogas slurry is effectively realized, and the storage and transportation problems of the biogas slurry are solved. More importantly, the fertilizer provided by the invention not only can improve the germination rate of seeds, but also can effectively shorten the germination time of the seeds, and also can obviously improve the drought resistance and waterlogging resistance of crops.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In the present invention, the measurement of the water content of each material, the measurement of the organic matter content, and the measurement of the total nutrient (nitrogen, phosphorus pentoxide, and potassium oxide) content were carried out in accordance with the agricultural industry standard NY525-2012 of the people's republic of china, unless otherwise specified.
In a first aspect, the invention provides a method for preparing a fertilizer from biogas slurry and biogas residues, which comprises the following steps:
(1) carrying out solid-liquid separation on the anaerobic fermentation product of the biogas to obtain biogas residues and biogas slurry;
(2) concentrating the obtained biogas slurry to obtain a concentrated solution;
(3) mixing the biogas residue and the concentrated solution and drying;
(4) and mixing the obtained dried material with an optional nutrient conditioner to obtain the fertilizer.
According to the present invention, the biogas anaerobic fermentation product may be a product of various materials for anaerobic preparation of biogas, which are conventional in the art, after preparation of biogas. Generally, the biogas residues mainly contain organic matters, humic acid, nitrogen, phosphorus, potassium and other substances; the biogas slurry mainly contains various substances such as amino acids, vitamins, proteins, saccharides, nucleic acid, nitrogen, phosphorus, potassium, organic matters and the like. The contents of the components in the biogas residues and the biogas slurry are different according to the raw materials used for preparing the biogas, and the invention is not limited.
Wherein, the raw materials for preparing the biogas can be straws, green grass, vegetables, human and animal excreta, household garbage, vinasse, sludge and the like. The invention preferably selects the biogas anaerobic fermentation product as the biogas anaerobic fermentation product of livestock manure and straws. More preferably, the excrement is cow dung, and the straw is corn straw.
In the process of research, the inventor of the present invention found that when the biogas anaerobic fermentation product is a biogas anaerobic fermentation product of livestock manure and straw fermented for at least 45 days, the properties of the finally prepared fertilizer, such as the fertility of the fertilizer, shortening of the germination time of seeds, and improvement of drought and waterlogging resistance of crops, can be further enhanced.
According to the present invention, in the step (1), the water content of the biogas residue obtained after the solid-liquid separation can be selected within a wide range, and preferably, the water content of the biogas residue is 50 to 85% by weight, preferably 50 to 70% by weight.
The solid-liquid separation method may be any of various methods that are conventionally used in the art and are capable of performing solid-liquid separation, such as, but not limited to, filter pressing, screw extrusion, horizontal screw centrifugation, and the like. The conditions for the solid-liquid separation may be specifically selected according to various modes, as long as the water content of the resulting biogas residue can be ensured within the above preferred range.
According to the invention, the water content of the concentrate in step (2) can be selected within a wide range, preferably from 65 to 80% by weight.
The concentration method may be any method conventionally used in the art, which can concentrate the liquid phase, such as, but not limited to, multi-effect evaporation, MVR evaporation, membrane concentration, and the like. The conditions for the concentration may be specifically selected depending on various ways, as long as the water content of the resulting concentrate can be ensured within the preferable range as described above.
According to the present invention, in order to sufficiently solve the problem that the biogas slurry is difficult to transport and store and to increase the effect of the produced fertilizer, it is preferable that the biogas residue and the concentrate used for mixing in the step (3) are all of the biogas residue and all of the concentrate.
In the present invention, it is preferable that the drying condition in the step (3) is such that the water content of the resultant dried material is not more than 30% by weight.
According to the invention, in order to improve the fertility of the obtained fertilizer, the obtained dried material is preferably mixed with a nutrient conditioner. Preferably, the nutrient conditioner is added in an amount such that the organic matter content on a dry basis is from 45 to 65 wt% and the total nutrient content on a dry basis is from 5 to 15 wt%.
Preferably, the nutrient conditioner is at least one of organic matter, inorganic salts, and microorganisms.
Examples of the organic matter include, but are not limited to, at least one of corncobs, rice hulls, wood chips, straw, tapioca chips, beet pulp, corn husks, peanut shells, and plant ash, among others.
Examples of the inorganic salt include, but are not limited to, at least one of ammonium sulfate, potassium sulfate, ammonium phosphate, potassium nitrate, manganese sulfate, and zinc sulfate.
Examples of the microorganism include, but are not limited to, at least one of bacillus subtilis, bacillus licheniformis, rhizobia, azotobacter, phosphate solubilizing bacteria, and photosynthetic bacteria. The addition of the microorganisms can also improve the peripheral flora of the crops to be fertilized, so that the performance of the fertilizer is further improved.
A second aspect of the invention provides a fertilizer prepared by the method as described above.
The fertilizer provided by the invention can provide sufficient nutrients for seeds, accelerate the germination speed of the seeds and improve the germination rate of the seeds. Meanwhile, the fertilizer provided by the invention has higher water retention capacity and stimulates drought stress reaction of crops during drought, so that the crops can be more drought-resistant, and the oxygen storage amount of soil can be increased and the waterlogging stress reaction of the crops can be stimulated during waterlogging, so that the crops can be more waterlogging-resistant.
Thus, a third aspect of the invention provides the use of a fertilizer as described above for accelerating seed germination and for improving the drought and waterlogging resistance of a crop.
Examples
The present invention will be described in detail below by way of examples. In the following examples and comparative examples,
the determination of the water content, the determination of the organic matter content and the determination of the total nutrient (nitrogen, phosphorus pentoxide and potassium oxide) content of each material are carried out according to the agricultural industry standard NY525-2012 of the people's republic of China.
Preparation example
This preparation example is intended to illustrate the preparation of anaerobic fermentation products of biogas
The method comprises the following steps of performing methane anaerobic fermentation on cow dung and corn straws (with proper components added and the carbon-nitrogen ratio controlled at 30:1) under an anaerobic condition by taking methanogens as strains, wherein the fermentation temperature is 20-55 ℃, the pH value is 6.5-7.5, and the moisture content is about 85-95 wt%.
Example 1
This example illustrates the preparation of a fertilizer according to the invention
(1) Conveying the biogas anaerobic fermentation product obtained by fermenting for 2 months into a plate-and-frame filter press through a pump, and performing solid-liquid separation to obtain biogas residues (with the water content of 70 wt%) and biogas slurry (with the water content of 95 wt%).
(2) And concentrating the biogas slurry by using a triple-effect evaporation system to ensure that the water content of the concentrated biogas slurry reaches 70 wt%.
(3) Mixing all the biogas residues and all the concentrated biogas slurry, and drying the obtained mixture by using a tube bundle dryer until the water content is 25 wt%.
(4) The obtained dried material is mixed with the cassava residue, ammonium sulfate, potassium sulfate and ammonium phosphate, so that the organic matter content of the fertilizer is 50 wt% on a dry basis, and the total nutrients (nitrogen, phosphorus pentoxide and potassium oxide) are 6.1 wt% on a dry basis, and the quality standard of the organic fertilizer is achieved.
Example 2
This example illustrates the preparation of a fertilizer according to the invention
(1) Conveying the biogas anaerobic fermentation product obtained by fermenting for 2 months into a plate-and-frame filter press through a pump, and performing solid-liquid separation to obtain biogas residues (with the water content of 60 wt%) and biogas slurry (with the water content of 95 wt%).
(2) And concentrating the biogas slurry by using a triple-effect evaporation system to ensure that the water content of the concentrated biogas slurry reaches 80 wt%.
(3) Mixing all the biogas residues and all the concentrated biogas slurry, and drying the obtained mixture by using a tube bundle dryer until the water content is 29 weight percent.
(4) The obtained dried material is mixed with corncobs, ammonium sulfate, manganese sulfate and zinc sulfate, so that the organic matter content of the fertilizer is 45 wt% in terms of dry basis, and the total nutrients (nitrogen, phosphorus pentoxide and potassium oxide) are 5.0 wt% in terms of dry basis, and the quality standard of the organic fertilizer is achieved.
Example 3
This example illustrates the preparation of a fertilizer according to the invention
(1) Conveying the biogas anaerobic fermentation product obtained by fermenting for 2 months into a plate-and-frame filter press through a pump, and performing solid-liquid separation to obtain biogas residues (with the water content of 50 wt%) and biogas slurry (with the water content of 97 wt%).
(2) And concentrating the biogas slurry by using a triple-effect evaporation system, so that the water content of the concentrated biogas slurry reaches 65 wt%.
(3) Mixing all the biogas residues and all the concentrated biogas slurry, and drying the obtained mixture by using a tube bundle dryer until the water content is 20 wt%.
(4) The obtained dried material is mixed with corn husks, rice husks, potassium sulfate, ammonium phosphate and manganese sulfate, so that the organic matter content of the fertilizer is 55 wt% on a dry basis, and the total nutrients (nitrogen, phosphorus pentoxide and potassium oxide) are 5.4 wt% on the dry basis, and the quality standard of the organic fertilizer is achieved.
Example 4
This example illustrates the preparation of a fertilizer according to the invention
The preparation of the fertilizer was carried out according to the method of example 1, except that,in the step (4), bacillus subtilis and rhizobia are also added, and the addition amount of the bacillus subtilis is 1-2 multiplied by 107cfu/g of the mixed material, the content of rhizobia is 1-2 multiplied by 107cfu/g of the mixed material.
Example 5
This example illustrates the preparation of a fertilizer according to the invention
The preparation of fertilizer was carried out according to the method of example 1 except that, in the step (1), the biogas anaerobic fermentation product was taken as a biogas anaerobic fermentation product fermented for 1 month.
Comparative example 1
This comparative example is illustrative of the preparation of the fertilizer provided by the present invention
The preparation of fertilizer was performed according to the method of example 1, except that in step (2), no biogas slurry was added.
Comparative example 2
This comparative example is illustrative of the preparation of the fertilizer provided by the present invention
The fertilizer was prepared according to the method of example 1, except that in step (2), the biogas residue was not added.
Test example
(1) 800 full corn seeds were selected and randomly divided into 8 groups of 100 seeds. The fertilizers prepared as above in examples 1 to 5 and comparative examples 1 to 2 were then mixed with soil at a ratio of 1 wt% respectively, and then sown with seeds while keeping the soil moist (water content controlled at around 17%) with the soil not mixed with any fertilizer as a blank. The time to 50% of the seeds germination (T) per group was recorded50) And germination after 120h, the results are shown in Table 1.
(2) After the seeds germinate, each group is averagely divided into 2 parts, wherein one group is subjected to drought treatment, the soil water content is controlled to be about 8%, and the other group is subjected to waterlogging treatment, the soil water content is controlled to be about 25%; and the other group of normal treatment controls the water content of the soil to be about 17 percent. After 1 month of growth, each crop was harvested flush with the soil and weighed after harvesting. The results show that the weight of the drought-treated group and the waterlogging-treated group in each group is reduced relative to the weight of the normal group crops, indicating that the drought and waterlogging model is successfully established. And meanwhile, the increment condition (drought increment) of the drought treatment group relative to the blank control drought group and the increment condition (waterlogging increment) of the waterlogging situation treatment group relative to the blank control waterlogging situation group are calculated, and the results are shown in table 1.
TABLE 1
| Example numbering | T50(h) | Percentage of germination (%) | Drought increment (%) | Increment of waterlogging (%) |
| Example 1 | 65 | 99 | 12.0 | 18.6 |
| Example 2 | 67 | 99 | 11.7 | 18.3 |
| Example 3 | 63 | 99 | 12.5 | 19.4 |
| Example 4 | 60 | 99 | 13.1 | 20.3 |
| Example 5 | 68 | 99 | 11.8 | 18.3 |
| Comparative example 1 | 70 | 97 | 11.5 | 17.1 |
| Comparative example 2 | 72 | 96 | 11.1 | 18.0 |
| Blank control | 80 | 95 | --- | --- |
As can be seen from the examples and the table 1 of the application, the invention effectively realizes high-value utilization of the biogas slurry, solves the problems of storage and transportation of the biogas slurry, and has the advantages of low investment and simple operation. More importantly, the fertilizer provided by the invention not only can improve the germination rate of seeds, but also can effectively accelerate the germination time of the seeds, and also can obviously improve the drought resistance and waterlogging resistance of crops.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (9)
1. A method for preparing a fertilizer by utilizing biogas slurry and biogas residues is characterized by comprising the following steps:
(1) carrying out solid-liquid separation on the anaerobic fermentation product of the biogas to obtain biogas residues and biogas slurry;
(2) concentrating the obtained biogas slurry to obtain a concentrated solution;
(3) mixing the biogas residue and the concentrated solution and drying;
(4) and mixing the obtained dried material with an optional nutrient conditioner to obtain the fertilizer.
2. The method according to claim 1, wherein in the step (1), the solid-liquid separation condition is that the water content of the biogas residue is 50-85 wt%.
3. A process according to claim 1 or 2, wherein in step (2), the concentration conditions are such that the water content of the concentrate is from 65 to 80% by weight.
4. The method according to any one of claims 1 to 3, wherein in the step (3), the biogas residue and the concentrate for mixing are all biogas residues and all concentrates;
preferably, the drying conditions are such that the moisture content of the resulting dried material is not higher than 30% by weight.
5. The method of claim 1, wherein the nutrient conditioner is at least one of organic matter, inorganic salts, and microorganisms;
preferably, the organic matter is selected from at least one of corncobs, rice hulls, wood chips, straws, cassava residues, beet pulp, corn husks, peanut shells and plant ash;
the inorganic salt is at least one selected from ammonium sulfate, potassium sulfate, ammonium phosphate, potassium nitrate, manganese sulfate and zinc sulfate;
the microorganism is at least one of bacillus subtilis, bacillus licheniformis, rhizobium, azotobacter, phosphate solubilizing bacteria and photosynthetic bacteria.
6. The method of claim 1 or 5, wherein the nutrient conditioner is added in an amount such that the organic content on a dry basis is from 45 to 65 wt% and the total nutrient content on a dry basis is from 5 to 15 wt%.
7. The method of claim 1, wherein the biogas anaerobic fermentation product is a biogas anaerobic fermentation product of organic waste; the organic waste is selected from crop straws, green grass, vegetables, human and animal excreta, domestic garbage, vinasse and sludge;
preferably, the biogas anaerobic fermentation product is a biogas anaerobic fermentation product of a mixed raw material of livestock manure fermented for at least 45 days and crop straws.
8. A fertilizer produced by the method of any one of claims 1-7.
9. The fertilizer of claim 8 for accelerating seed germination, increasing seed germination rate, and improving drought and waterlogging resistance of crops.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111575008A (en) * | 2020-05-09 | 2020-08-25 | 刘文治 | A complete set of equipment for the recycling of biogas slurry and biogas residue |
| CN111704508A (en) * | 2020-07-06 | 2020-09-25 | 云南顺丰洱海环保科技股份有限公司 | Organic fertilizer spraying preparation method containing biogas digestion liquid residues |
| CN111792959A (en) * | 2020-06-22 | 2020-10-20 | 温州科技职业学院 | A kind of multifunctional compound fermented fertilizer and preparation method thereof |
| CN112830840A (en) * | 2021-01-21 | 2021-05-25 | 聊城职业技术学院 | Composite microbial fertilizer and preparation method and application thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107337506A (en) * | 2017-06-22 | 2017-11-10 | 西安建筑科技大学 | Anaerobic fermentation compound additive and promotion biogas residue, the method for biogas slurry fertilizer anaerobic fermentation |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107337506A (en) * | 2017-06-22 | 2017-11-10 | 西安建筑科技大学 | Anaerobic fermentation compound additive and promotion biogas residue, the method for biogas slurry fertilizer anaerobic fermentation |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111575008A (en) * | 2020-05-09 | 2020-08-25 | 刘文治 | A complete set of equipment for the recycling of biogas slurry and biogas residue |
| CN111792959A (en) * | 2020-06-22 | 2020-10-20 | 温州科技职业学院 | A kind of multifunctional compound fermented fertilizer and preparation method thereof |
| CN111704508A (en) * | 2020-07-06 | 2020-09-25 | 云南顺丰洱海环保科技股份有限公司 | Organic fertilizer spraying preparation method containing biogas digestion liquid residues |
| CN112830840A (en) * | 2021-01-21 | 2021-05-25 | 聊城职业技术学院 | Composite microbial fertilizer and preparation method and application thereof |
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