CN217947896U - System for preparing water-soluble total nutrient liquid fertilizer by utilizing livestock and poultry breeding biogas slurry - Google Patents

Abstract

The utility model provides a system for utilize livestock and poultry cultivation natural pond liquid to prepare water-soluble full nutrient liquid fertilizer, including the head tank that is used for saving natural pond liquid, there are aeration tank, coarse filter, buffer memory collecting tank, bidirectional separation reservoir, semi-manufactured goods jar, blendor, element digester, centrifuge and the finished product jar that is used for saving water-soluble full nutrient liquid fertilizer through the pipeline intercommunication in proper order on the head tank, aeration tank bottom intercommunication has the aeration machine, still includes at least one and is arranged in to the blendor in transport external source nutritive material's the feed bin of throwing. The utility model discloses an utilize system of natural pond liquid preparation water-soluble full nutrient liquid fertilizer of beasts and birds cultivation is a collection material and educates fungus, aeration, colating, automatic blending, stirring, digestion reaction, essence and strain, stock solution, filling in the liquid fertilizer production system of an organic whole, has advantages such as production efficiency height, running cost hang down.

Description

System for preparing water-soluble total nutrient liquid fertilizer by utilizing livestock and poultry breeding biogas slurry

Technical Field

The utility model belongs to solid waste handles and utilization field, concretely relates to utilize system of livestock and poultry cultivation natural pond liquid preparation water-soluble total nutrient liquid fertilizer.

Background

With the rapid development of livestock industry, the scale of livestock farms is continuously enlarged, and a large amount of livestock breeding excrement is inevitably generated. If this waste cannot be effectively treated, it will have adverse effects on the environment. The anaerobic fermentation technology is used as a resource utilization technology of the livestock and poultry manure, can effectively convert the livestock and poultry breeding manure, and generates clean energy such as methane and the like. But also produces a large amount of by-products such as biogas slurry and biogas residue. The biogas residues can be used for preparing solid organic fertilizer in a composting manner, and can also be used for preparing nutrient soil, preparing culture material and culturing fish. Compared with biogas residues, the biogas slurry has huge yield and higher water content, so the problems of high storage and transportation cost and the like exist. Because the ammonia nitrogen, phosphate and COD content in the biogas slurry is higher, the difficulty of treatment and utilization is correspondingly increased. If the biogas slurry can not be reasonably utilized and treated, the development of biogas engineering is restricted, and secondary pollution to the environment is caused.

The biogas slurry produced by fermenting the livestock and poultry manure contains rich nutrient elements such as nitrogen, phosphorus, potassium and the like, a large amount of organic substances, humic acid and other components, various amino acids, vitamins, auxin and various active enzymes, has the advantages of strong quick-acting nutrient capacity, high nutrient availability and the like, can improve the yield and quality of crops, has the effect of inhibiting plant diseases and insect pests, and is an effective raw material for preparing fertilizers. However, the direct application of biogas slurry may cause phenomena such as seedling burning, high concentration of soil solution, accumulation of nitrogen and phosphorus in soil, and the like; meanwhile, the biogas slurry may contain heavy metal ions, antibiotics, pathogenic microorganisms and the like, so that the practical application difficulty is high. In addition, the existing device for preparing organic fertilizer from biogas slurry is mainly in a small-scale mode taking families as a unit, and has the following defects: firstly, the automation degree of the production device is not high, and the production device still needs to depend on manpower; secondly, the production efficiency is low, and the method cannot be applied to industrial batch production; thirdly, the produced liquid organic fertilizer has low fertilizer efficiency and cannot be applied in different scenes. Therefore, how to overcome the defects in the existing organic fertilizer preparation device by utilizing biogas slurry, safely and efficiently treat and utilize the biogas slurry as a resource, produce a multifunctional organic fertilizer suitable for plant growth according to agricultural needs, and realize the preparation of a water-soluble full-nutrient liquid fertilizer by efficiently utilizing the livestock and poultry breeding biogas slurry, which becomes a technical problem urgently needed to be solved by technical personnel.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome the not enough of prior art, provide a system that utilizes beasts and birds cultivation natural pond liquid to prepare water-soluble full nutrition liquid fertilizer that production efficiency is high, running cost is low.

In order to solve the technical problem, the utility model adopts the following technical scheme.

A system for preparing a water-soluble full-nutrient liquid fertilizer by utilizing livestock and poultry breeding biogas slurry comprises a raw material tank for storing the biogas slurry, wherein the raw material tank is sequentially communicated with an aeration tank, a coarse filter, a cache liquid collecting tank, a bidirectional separation liquid storage device, a semi-finished product tank, a mixer, an element digester, a centrifugal machine and a finished product tank for storing the water-soluble full-nutrient liquid fertilizer through pipelines; the bottom of the aeration tank is communicated with an aerator; the system also includes at least one dosing bin for delivering exogenous nutrient substances into the blender.

As a further improvement of the technical scheme: an anaerobic fermentation tank is communicated between the raw material tank and the aeration tank; a self-suction non-clogging pipeline pump is arranged between the anaerobic fermentation tank and the aeration tank.

As a further improvement of the above technical solution: the aeration tank is also communicated with at least one microbial inoculum storage tank used for conveying deodorizing microbial inoculum to the aeration tank; and a valve and a flowmeter are arranged on a pipeline between the aeration tank and the microbial agent storage tank.

As a further improvement of the technical scheme: the aeration tank is communicated with the aerator through a pipeline, and an aeration hole is formed in the pipeline positioned in the aeration tank; a valve and a flowmeter are arranged on a pipeline between the aeration tank and the aerator; the aerator is a centrifugal fan.

As a further improvement of the above technical solution: a self-suction non-blocking pipeline pump is arranged between the aeration tank and the coarse filter; the coarse filter is a centrifugal roller screening dehydrator.

As a further improvement of the technical scheme: a self-suction type non-blocking pipeline pump is arranged between the bidirectional separation liquid storage device and the semi-finished product tank; a metering pump is arranged between the semi-finished product tank and the mixer; and a spiral elevator and a weight meter are arranged between each feeding bin and the mixer.

As a further improvement of the technical scheme: the device also comprises a heater for maintaining the reaction temperature of the element digester; the heater comprises a heat conduction pipe arranged in the element digester and heat conduction oil circularly flowing in the heat conduction pipe; the element digester is also provided with a stirrer.

As a further improvement of the above technical solution: a self-suction non-blocking pipeline pump is arranged between the element digester and the centrifugal machine; the centrifugal machine is a three-foot type centrifugal solid-liquid separator.

As a further improvement of the above technical solution: the fertilizer filling machine is used for filling water-soluble full-nutrient liquid fertilizer; and a delivery pump for delivering the water-soluble full-nutrient liquid fertilizer is arranged between the finished product tank and the filling machine.

Compared with the prior art, the utility model has the advantages of:

the utility model provides a system for utilize beasts and birds to breed natural pond liquid preparation water-soluble full nutrient liquid fertilizer, including the head tank that is used for saving natural pond liquid, there are aeration tank, anaerobic fermentation jar, prefilter, buffer memory collecting tank, two-way separation reservoir, semi-manufactured goods jar, blendor, element digester, centrifuge and the finished product jar that is used for saving water-soluble full nutrient liquid fertilizer through the pipeline intercommunication in proper order on the head tank, aeration tank bottom intercommunication has the aerator, still include at least one be arranged in to the blendor in carry the feed bin of exogenous nutrient substance, be an album material fungus of growing, aeration, the colating, automatic blending, stirring, digestion reaction, the essence is strained, the stock solution, liquid fertilizer production system of filling in an organic whole, have following advantage: (a) The sterilization and deodorization of the livestock and poultry breeding biogas slurry can be safely, quickly and effectively realized, and meanwhile, macromolecular organic matters in the biogas slurry can be converted into micromolecular nutrient substances which can be directly utilized, so that the livestock and poultry breeding biogas slurry can be quickly converted into a liquid organic fertilizer which is fully water-soluble, comprehensive in nutrition and high in fertilizer efficiency, and compared with a conventional liquid fertilizer, the liquid organic fertilizer can be more quickly dissolved in water, has high total nutrient content and stable property, and is favorable for realizing the maximum utilization of the livestock and poultry breeding biogas slurry; (b) The livestock and poultry breeding biogas slurry can be treated in large batch, the batch production of liquid fertilizer can be realized according to the needs, and the harmless treatment and resource utilization of the livestock and poultry breeding biogas slurry are favorably realized; (c) The liquid fertilizer meeting the growth requirements of different plants can be prepared according to the needs, and has the advantages of comprehensive nutrients, flexible formula, wide application range and good application prospect; (d) The automation degree is high, manpower and material resources can be effectively saved, and the operation cost is reduced to the maximum extent.

Drawings

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention.

Fig. 1 is a system schematic diagram of the utility model for preparing water-soluble full-nutrient liquid fertilizer by utilizing livestock and poultry breeding biogas slurry.

Illustration of the drawings:

1. a raw material tank; 2. anaerobic fermentation tank; 3. an aeration tank; 31. an aerator; 4. a coarse filter; 5. a liquid collecting groove is cached; 6. a bidirectional separation reservoir; 7. a semi-finished product tank; 8. a mixer; 81. a feeding bin; 9. an element digester; 91. a heater; 10. a centrifuge; 11. a finished product tank; 12. and (6) filling machine.

Detailed Description

The invention will be further described with reference to the drawings and specific preferred embodiments without limiting the scope of the invention. The materials and equipment used in the following examples are commercially available.

Example 1:

as shown in fig. 1, the system for preparing a water-soluble full-nutrient liquid fertilizer from livestock and poultry breeding biogas slurry comprises a raw material tank 1 for storing biogas slurry, wherein the raw material tank 1 is sequentially communicated with an anaerobic fermentation tank 2, an aeration tank 3, a coarse filter 4, a buffer liquid collecting tank 5, a bidirectional separation liquid storage 6, a semi-finished product tank 7, a mixer 8, an element digester 9, a centrifuge 10 and a finished product tank 11 for storing the water-soluble full-nutrient liquid fertilizer through pipelines; the bottom of the aeration tank 3 is communicated with an aerator 31; the system further comprises at least one feeding bin 81 for feeding exogenous nutrients into the mixer 8.

In this embodiment, a self-priming non-clogging pipe pump is arranged between the anaerobic fermentation tank 2 and the aeration tank 3.

In this embodiment, the aeration tank 3 is further communicated with at least one microbial inoculum storage tank for conveying a deodorizing microbial inoculum into the aeration tank 3; a valve and a flowmeter are arranged on a pipeline between the aeration tank 3 and the microbial inoculum storage tank.

In the embodiment, the aeration tank 3 is communicated with the aerator 31 through a pipeline, and the pipeline positioned in the aeration tank 3 is provided with aeration holes; a valve and a flowmeter are arranged on a pipeline between the aeration tank 3 and the aerator 31. The aerator 31 is a centrifugal fan.

In the embodiment, a self-suction non-clogging pipeline pump is arranged between the aeration tank 3 and the coarse filter 4; the coarse filter 4 is a centrifugal roller screening dehydrator.

In the embodiment, a self-suction non-blocking pipeline pump is arranged between the bidirectional separation liquid storage device 6 and the semi-finished product tank 7; a metering pump is arranged between the semi-finished product tank 7 and the mixer 8; a spiral elevator and a weight meter are arranged between each charging bin 81 and the mixer 8.

In this embodiment, a heater 91 for maintaining the reaction temperature of the element digester 9 is further included; the heater 91 includes a heat conduction pipe installed inside the element digester 9 and heat conduction oil circulating in the heat conduction pipe; the element digester 9 is also provided with a stirrer.

In this embodiment, a self-priming non-clogging pipeline pump is arranged between the element digester 9 and the centrifuge 10; the centrifuge 10 is a three-leg centrifuge solid-liquid separator.

In the embodiment, the fertilizer filling machine also comprises a filling machine 12 for filling water-soluble full-nutrient liquid fertilizer; a delivery pump for delivering the water-soluble full-nutrient liquid fertilizer is arranged between the finished product tank 11 and the filling machine 12.

The system for preparing the water-soluble full-nutrient liquid fertilizer by utilizing the livestock and poultry breeding biogas slurry comprises a raw material tank for storing the biogas slurry, wherein the raw material tank is sequentially communicated with an aeration tank, an anaerobic fermentation tank, a coarse filter, a cache liquid collecting tank, a bidirectional separation liquid storage device, a semi-finished tank, a mixer, an element digester, a centrifugal machine and a finished product tank for storing the water-soluble full-nutrient liquid fertilizer through pipelines, the bottom of the aeration tank is communicated with the aerator, and the system further comprises at least one feeding bin for conveying exogenous nutrient substances into the mixer. In the utility model, by utilizing the anaerobic fermentation tank to perform pre-fermentation on the livestock and poultry breeding biogas slurry, not only can the incompletely fermented organic matters in the livestock and poultry breeding biogas slurry be decomposed, but also a suitable environment and a carrier are provided for the subsequent element reaction process, so that the fertilizer efficiency and the safety of the biogas slurry are improved, and simultaneously, the dominant flora can be respectively cultured in two stages, and the dominant flora is jointly started to be beneficial to removing ammonia nitrogen and the preparation of the subsequent biogas slurry; the aerobic fermentation and deodorization treatment are carried out on the biogas slurry treated by the anaerobic fermentation tank by utilizing the aeration tank, part of germs and parasitic ova in the biogas slurry can be killed, and the introduced air can inactivate bacteria, reduce the propagation of harmful microorganisms in the biogas slurry, and simultaneously can carry out deodorization and harm removal on the biogas slurry and enrich nutrients; filtering out substances such as sand grains and plant fibers with larger particles by a coarse filter; the precipitation treatment of the bidirectional separation liquid storage device is beneficial to removing impurities precipitated in the solution due to mutual reaction, the stability and the color and luster of the subsequently prepared water-soluble fertilizer are improved, and the reduction of the efficacy of the water-soluble fertilizer due to precipitation is avoided; the biogas slurry in the semi-finished product tank is conveyed into a mixer, and exogenous nutrient substances (such as nitrogen, phosphorus, potassium, trace elements and the like, which can be adjusted according to the requirements of different crops) in a feeding bin are conveyed into the mixer for mixing, so that liquid fertilizers containing different nutrient elements can be prepared according to different requirements; furthermore, in the element digester, exogenous nutrient substances can be dissolved with higher speed and are uniformly mixed with biogas slurry, so that different elements can be fused more uniformly, the stability of the water-soluble fertilizer can be improved, the service efficiency and stability of the water-soluble fertilizer can be guaranteed, the storage period can be prolonged, and the defects of more impurities, poor solubility and the like of the existing liquid fertilizer can be overcome. Meanwhile, in order to further remove solid substances insoluble in water, the biogas slurry treated by the element digester is sent to a centrifuge (a fine filter) through a delivery pump and then transferred to a storage tank, so that a more stable water-soluble full-nutrient liquid fertilizer can be obtained. Finally, the biogas slurry is pumped into a finished product tank through a self-suction non-blocking pipeline pump, so that the product quality can be controlled, the temperature is prevented from rising, mildewing or crystallizing, and the water-soluble full-nutrient liquid fertilizer is filled by a filling machine to be made into commercial fertilizer, so that the water-soluble full-nutrient liquid fertilizer is prevented from losing efficacy in the validity period and is easy to transport and sell. Therefore, the utility model discloses actually be a collect material and educate fungus, aeration, colating, automatic blending, stirring, digestion reaction, essence and strain, stock solution, filling in liquid fertilizer production system of an organic whole, have following advantage: (a) The sterilization and deodorization of the livestock and poultry breeding biogas slurry can be safely, quickly and effectively realized, and meanwhile, macromolecular organic matters in the biogas slurry can be converted into micromolecular nutrient substances which can be directly utilized, so that the livestock and poultry breeding biogas slurry can be quickly converted into a liquid organic fertilizer which is fully water-soluble, comprehensive in nutrition and high in fertilizer efficiency, and compared with a conventional liquid fertilizer, the liquid organic fertilizer can be more quickly dissolved in water, has high total nutrient content and stable property, and is favorable for realizing the maximum utilization of the livestock and poultry breeding biogas slurry; (b) The livestock and poultry breeding biogas slurry can be treated in large batch, the batch production of liquid fertilizer can be realized according to the needs, and the harmless treatment and resource utilization of the livestock and poultry breeding biogas slurry are favorably realized; (c) The liquid fertilizer meeting the growth requirements of different plants can be prepared according to the needs, and has the advantages of comprehensive nutrients, flexible formula, wide application range and good application prospect; (d) The automation degree is high, manpower and material resources can be effectively saved, and the operation cost is reduced to the maximum extent.

The system for preparing the water-soluble total nutrient liquid fertilizer by utilizing the livestock and poultry breeding biogas slurry comprises the following steps when being used for preparing the water-soluble total nutrient liquid fertilizer:

(1) Solid-liquid separation: the method comprises the steps that excrement (including excrement, urine and flushing water) of a livestock and poultry farm is subjected to anaerobic fermentation through a biogas utilization project (namely an anaerobic fermentation tank connected with a biogas utilization system), and a generated mixture is subjected to solid-liquid separation through a solid-liquid separator, so that biogas residues and biogas slurry are separated, wherein the solid-liquid separation can effectively avoid the phenomenon of equipment blockage caused by the fact that excessive solid matters are brought into subsequent treatment processes/equipment, and can avoid continuous rise of indexes of pollutants in the biogas slurry.

(2) Pre-fermentation: and pumping the biogas slurry obtained after solid-liquid separation into a raw material tank, and further conveying the biogas slurry into an anaerobic fermentation tank for pre-fermentation (anaerobic fermentation). At the moment, organic matters which are not completely fermented are contained in the biogas slurry, the organic matters in the biogas slurry can be further decomposed through the pre-fermentation step, and a suitable environment and a carrier can be provided for the element digestion process, so that the fertilizer efficiency and the safety of the biogas slurry are improved. In the step, before aerobic fermentation, pre-fermentation can be performed, and dominant floras (anaerobic bacteria and aerobic bacteria) can be respectively cultured in two stages (an anaerobic fermentation stage and an aerobic fermentation stage), and the dominant floras are jointly started, so that ammonia nitrogen can be removed, and subsequent biogas slurry culture deodorization can be performed. The feeding bin can be used for storing the biogas slurry after the anaerobic fermentation is completed. The outlet of the feeding bin is connected with an aeration tank through a sewage pump.

(3) Culturing bacteria with biogas slurry and aerating: pumping biogas slurry to an aeration tank through a self-suction non-clogging pipeline pump, and carrying out intermittent aerobic aeration in the aeration tank for 3-5 hours. Air is continuously input into the aeration tank, the fermentation temperature can reach more than 50 ℃, and partial pathogenic bacteria and parasitic ova in the biogas slurry can be killed. And (5) finishing fermentation when the fermentation temperature is reduced. The bubbles generated by aeration can inactivate bacteria and reduce the propagation of harmful microorganisms in the biogas slurry. Because the biogas slurry has considerable pungent odor, deodorization treatment needs to be carried out at the same time, specifically, deodorizing microbial inoculums (such as decomposing agents such as microbial inoculums special for organic fertilizer fermentation) in a microbial inoculums storage tank are added into an aeration tank to carry out deodorization and harm removal on the biogas slurry, and nutrients can be enriched at the same time. The microbial inoculum special for organic fertilizer fermentation adopted in the step is a naturally-generated and scientifically-selected liquid composite microbial inoculum which is prepared by mixing and fermenting 10 different strains, can quickly degrade various macromolecular carbohydrates and organic complex substances in biogas slurry, and finally converts the macromolecular carbohydrates and the organic complex substances into micromolecular substances which can be directly absorbed and utilized by microorganisms and crops. Specifically, microbial strains capable of eliminating biogas slurry odor are screened from the nature, and an aerobic aeration process is added to achieve the aim of deodorization; can effectively control and prevent odor and stink from generating, and accelerate the natural decomposition of organic waste. One kilogram of microbial inoculum can treat 5 to 10 square of biogas slurry, and the fermentation period is 5 to 14 days.

In the step, the biogas slurry is placed in an aeration tank for aeration and deodorization, and the main purpose is to promote the full conversion of organic materials in the biogas slurry by promoting the growth of microorganisms and utilizing the heat generated by propagation, so that carbon, nitrogen, phosphorus, potassium, sulfur and the like are decomposed and mineralized, macromolecules are converted into micromolecules or humus which are easy to utilize by crops, and meanwhile, the effects of heating, deodorization, elimination of pathogenic microorganisms and ova and increase of quick-acting nutrients are achieved. Compare with conventional ozone deodorization, the utility model discloses in, utilize the aeration machine to let in the air and aerate and deodorize natural pond liquid with the special microbial inoculum of fertilizer fermentation in the microbial inoculum storage jar to natural pond liquid in the aeration jar, not only with low costs, can also reach the purpose of deodorization and improvement water-soluble fertile efficiency.

(4) After aerobic fermentation is completed, the biogas slurry in the aeration tank is pumped to a coarse filter for filtering, substances such as sand grains and plant fibers with larger filtering particles are filtered, then the biogas slurry filtered by the coarse filter is stored in a cache liquid collecting tank, and then the biogas slurry is pumped to a bidirectional separation liquid storage device for precipitation treatment, wherein the precipitation effect through the bidirectional separation liquid storage device is beneficial to removing precipitation impurities formed in the solution due to mutual reaction, the improvement of the stability and the color and luster of the subsequently prepared water soluble fertilizer is facilitated, and the defect that the efficiency of the water soluble fertilizer is reduced due to precipitation is avoided. The biogas slurry after the precipitation treatment of the bidirectional separation liquid storage device is sent into a semi-finished product tank from a liquid phase outlet of the bidirectional separation liquid storage device by a delivery pump and enters a full-automatic batching and premixing system.

(5) Full-automatic batching: according to nutrient components required by growth of crops and flower plants, biogas slurry in the semi-finished product tank and exogenous nutrient substances in the feeding bin are respectively conveyed into a mixer, the biogas slurry and the exogenous nutrient substances are uniformly stirred and mixed in the mixer, wherein the added exogenous nutrient substances at least comprise nutrient elements such as nitrogen, phosphorus, potassium and the like. The utility model discloses, can prepare into the fertile product of the organic concentrated compound liquid of efficient according to plants such as different crops, flowers and plants nutrient composition's in to natural pond liquid different demands, enlarge the application range of natural pond liquid, realize the high added value utilization of natural pond liquid, make it have more wide development prospect in the aspect of producing nuisanceless green agricultural product and flower planting.

(6) Element digestion: the biogas slurry pump in the mixer is used for pumping the biogas slurry into the element digester, the stirrer and the heater are started, the liquid fertilizer is subjected to element digestion, and different elements are more uniformly fused. The element digestion is beneficial to improving the stability of the water-soluble fertilizer, the use efficiency and stability of the water-soluble fertilizer are ensured, and the storage period is prolonged. Through the treatment of the element digester, the defects of more impurities and poorer solubility of the product in the prior art can be effectively overcome.

(7) Liquid storage: the biogas slurry treated by the element digester is sent into a centrifuge (a fine filter) by a delivery pump to remove solid substances insoluble in water to obtain a water-soluble full-nutrient liquid fertilizer (finished product), and then the biogas slurry is pumped into a finished product tank (a vertical liquid storage tank) by a self-suction non-clogging pipeline pump to be stored for later use, so that the product quality is controlled, the temperature is prevented from rising, mildewing or crystallizing, and the liquid fertilizer is more homogeneous by properly aerating and stirring. In the water-soluble full-nutrient liquid fertilizer (finished product) prepared in the step, the content of humic acid is more than or equal to 30g/L, the total content of nitrogen, phosphorus and potassium elements is more than or equal to 400g/L, and the content of single nitrogen, phosphorus and potassium is not less than 40g/L. The mass fraction of the water-insoluble substance is 50g/L or less.

(8) Filling: conveying the water-soluble full-nutrient liquid fertilizer (finished product) in a finished product tank (a vertical liquid storage tank) to a filling machine (a full-automatic computer middle barrel weighing type filling machine) through a conveying pump for filling.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. Those skilled in the art can make many possible variations and modifications to the disclosed solution, or equivalent embodiments modified by the equivalent methods, without departing from the spirit and technical scope of the present invention, using the method and technical content disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments by the technical entity of the present invention all still belong to the protection scope of the technical solution of the present invention.

Claims (9)

1. A system for preparing a water-soluble full-nutrient liquid fertilizer by utilizing livestock and poultry breeding biogas slurry is characterized by comprising a raw material tank (1) for storing biogas slurry, wherein the raw material tank (1) is sequentially communicated with an aeration tank (3), a coarse filter (4), a cache liquid collecting tank (5), a bidirectional separation liquid storage device (6), a semi-finished product tank (7), a mixer (8), an element digester (9), a centrifugal machine (10) and a finished product tank (11) for storing the water-soluble full-nutrient liquid fertilizer through pipelines; the bottom of the aeration tank (3) is communicated with an aerator (31); the system further comprises at least one feeding bin (81) for feeding exogenous nutrients into the mixer (8).

2. The system for preparing the water-soluble total nutrient liquid fertilizer by utilizing the livestock and poultry breeding biogas slurry as claimed in claim 1, wherein an anaerobic fermentation tank (2) is further communicated between the raw material tank (1) and the aeration tank (3); a self-suction non-clogging pipeline pump is arranged between the anaerobic fermentation tank (2) and the aeration tank (3).

3. The system for preparing the water-soluble full-nutrient liquid fertilizer by utilizing the livestock and poultry breeding biogas slurry as claimed in claim 1 or 2, characterized in that the aeration tank (3) is also communicated with at least one microbial inoculum storage tank for conveying deodorizing microbial inoculum into the aeration tank (3); and a valve and a flowmeter are arranged on a pipeline between the aeration tank (3) and the microbial inoculum storage tank.

4. The system for preparing the water-soluble total nutrient liquid fertilizer by utilizing the livestock and poultry breeding biogas slurry as claimed in claim 3, wherein the aeration tank (3) is communicated with the aerator (31) through a pipeline, and the pipeline positioned inside the aeration tank (3) is provided with aeration holes; a valve and a flowmeter are arranged on a pipeline between the aeration tank (3) and the aerator (31); the aerator (31) is a centrifugal ventilator.

5. The system for preparing the water-soluble full-nutrient liquid fertilizer by utilizing the livestock and poultry breeding biogas slurry as claimed in claim 1 or 2, characterized in that a self-suction non-clogging pipeline pump is arranged between the aeration tank (3) and the coarse filter (4); the coarse filter (4) is a centrifugal roller screening dehydrator.

6. The system for preparing the water-soluble total nutrient liquid fertilizer by utilizing the livestock and poultry breeding biogas slurry as claimed in claim 1 or 2, wherein a self-suction non-clogging pipeline pump is arranged between the bidirectional separation reservoir (6) and the semi-finished product tank (7); a metering pump is arranged between the semi-finished product tank (7) and the mixer (8); and a spiral elevator and a weight meter are arranged between each feeding bin (81) and the mixer (8).

7. The system for preparing the water-soluble total nutrient liquid fertilizer by utilizing the livestock and poultry breeding biogas slurry as claimed in claim 1 or 2, further comprising a heater (91) for maintaining the reaction temperature of the element digester (9); the heater (91) comprises a heat conduction pipe arranged inside the element digester (9) and heat conduction oil circularly flowing in the heat conduction pipe; the element digester (9) is also provided with a stirrer.

8. The system for preparing the water-soluble full-nutrient liquid fertilizer by utilizing the livestock and poultry breeding biogas slurry as claimed in claim 1 or 2, characterized in that a self-suction non-clogging pipeline pump is arranged between the element digester (9) and the centrifugal machine (10); the centrifugal machine (10) is a three-leg centrifugal solid-liquid separator.

9. The system for preparing water-soluble full-nutrient liquid fertilizer by utilizing livestock and poultry breeding biogas slurry as claimed in claim 1 or 2, characterized by further comprising a filling machine (12) for filling the water-soluble full-nutrient liquid fertilizer; a delivery pump for delivering water-soluble full-nutrient liquid fertilizer is arranged between the finished product tank (11) and the filling machine (12).

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