A method for large-scale and harmless treatment of livestock and poultry urine

Abstract

This invention provides a method for large-scale, harmless treatment of livestock and poultry urine, characterized by the following steps: 1) solid-liquid separation of livestock and poultry manure; 2) transferring the separated liquid into an open treatment tank; 3) adding 0.5–2 kg of bacterial inoculum and 2–5 kg of proliferating bacteria per ton of liquid to the treatment tank; 4) supplying oxygen to the treatment tank at room temperature for 60–84 hours, allowing the compound bacteria to fully digest harmful substances in the livestock and poultry urine; the air flow rate is 0.01 m³ / ton of liquid. 3 / min; 5. After fermentation for 2-4 days, odorless and harmless liquid fertilizer is obtained. Through a small amount of microbial inoculum and propagated microorganisms, harmful substances are fully digested, malodorous gas emissions are reduced, pathogens, parasite eggs and weed seeds are killed, investment is low, and large-scale, harmless, efficient and rapid treatment is achieved.

Description

Technical Field

[0001] This invention relates to a urine treatment method, and more particularly to a method for large-scale, harmless treatment of livestock and poultry urine, belonging to the field of waste treatment technology. Background Technology

[0002] With the rapid development of my country's animal husbandry industry, numerous pig, cattle, and chicken farming industries have emerged. This has resulted in a large volume of livestock and poultry urine. Due to the excessive volume of urine, difficulties in harmless treatment, and a disproportionate input-output ratio, the urine from these industries cannot be treated in a timely manner, causing serious environmental and air pollution. Current methods for treating livestock and poultry urine have the following shortcomings: 1. Treating livestock and poultry urine as wastewater has the following shortcomings: 11) High nitrogen content: Livestock and poultry urine typically contains large amounts of nitrogen, such as ammonia nitrogen and urea. Excessive nitrogen entering the wastewater treatment system may lead to nitrogen emissions exceeding standards, causing eutrophication of receiving water bodies; 12) Organic load: Livestock and poultry urine contains a large amount of organic matter, which will increase the treatment load on wastewater treatment facilities, resulting in poor treatment effects; 13) Salt content: Livestock and poultry urine contains high levels of salt, which will adversely affect the growth of microorganisms and wastewater treatment processes. 14) Pathogen carriage: Livestock and poultry urine carries various pathogens, such as bacteria, viruses, and parasite eggs. Improper handling can spread diseases and pose a threat to public health. 15) Odor generation: Livestock and poultry urine has a strong odor. If not properly controlled during treatment, it can cause foul smells in the surrounding environment. 16) Inhomogeneity: The amount and composition of livestock and poultry urine vary with time and breeding conditions, making it difficult to ensure the stability and controllability of the treatment process. 17) High treatment costs: Specialized collection, transportation, and treatment of livestock and poultry urine require additional equipment and costs. 2. The shortcomings of using livestock and poultry urine as solid organic fertilizer are: Adding a large amount of biomass raw materials such as straw to fresh livestock and poultry urine, followed by fermentation with microbial inoculants, produces organic fertilizer for agricultural production. However, this method has a small processing capacity, requires a large amount of biomass resources such as straw, and the large amount of biomass resources and long processing time affect the processing efficiency. Furthermore, the high investment and cost hinder its widespread application. 3. The following are the drawbacks of using livestock and poultry urine for energy: 31) Difficulty in collection and transportation: Livestock and poultry urine is usually scattered, and collection and transportation require a lot of manpower, material resources and financial resources. In addition, there may be risks of leakage and environmental pollution in this process; 32) Large equipment investment: In order to realize energy utilization, it is necessary to purchase special treatment equipment and facilities, and the initial investment is large; 33) High operating and maintenance costs: During operation, energy and chemical agents are consumed, and the maintenance of equipment also requires certain costs; 34) The treated biogas residue is difficult to utilize, which is not convenient for promotion and application, and cannot be applied on a large scale or industrial scale; 35) High safety risks.

[0003] Furthermore, Chinese patent CN107182807B discloses a method for treating pig manure. This method involves dehydrating the pig manure, mixing it with fermenting bacteria, adding water, heating and boiling it, adding a deodorizing agent, organic acids, activated carbon, and hydroxides, etc. It's clear that this is a complex treatment of dehydrated pig manure, involving heating and boiling, deodorizing agent spraying, mixing with organic acids, heating, and filtration. The processing capacity is extremely limited, obviously only suitable for small-scale or even laboratory applications, and unsuitable for large-scale, industrial applications. A Chinese patent application discloses a method for the harmless fermentation treatment of pig urine. Although it also involves separating the liquid from the pig manure through solid-liquid separation for fermentation, it adds potassium humate to the manure liquid, along with at least one of photosynthetic bacteria, actinomycetes, yeast, and lactic acid bacteria for fermentation, ultimately obtaining a harmless, odorless manure liquid for agricultural production. However, the added potassium humate is a fertilizer-producing substance, requiring large quantities and resulting in high processing costs. Furthermore, it is unsuitable as a propagation medium for microorganisms due to the following drawbacks: A) Incomplete nutrient composition, lacking many key nutrients required for microbial growth, such as nitrogen sources, various minerals, and vitamins; B) Relatively complex and unclear composition, making precise control and adjustment of the propagation medium's components difficult; C) Potassium humate from different sources and production processes varies in quality and composition, leading to poor reproducibility and stability of propagation results. Therefore, existing technologies must be improved. Summary of the Invention

[0004] The present invention aims to provide a method for large-scale, harmless treatment of livestock and poultry urine, which is particularly suitable for treating pig urine.

[0005] This invention is achieved through the following technical solution: a method for large-scale, harmless treatment of livestock and poultry urine, characterized by comprising the following steps:

[0006] 1) Separate the solid and liquid components of livestock and poultry manure;

[0007] 2) The liquid after solid-liquid separation is sent into an open treatment tank;

[0008] 3) Add 0.5–2 kg of inoculum and 2–5 kg of propagated microorganisms per ton of liquid to the treatment tank, wherein:

[0009] The proliferative fungus consists of the following components in the following mass ratio:

[0010] Carbon source: Amino acids: B vitamins = 1-3 : 0.8-1.5 : 0.2-0.5;

[0011] The bacterial strain is a compound bacterial agent with an effective live bacteria count of 2 billion / g:

[0012] Nocardia white bacillus (1.6 billion CFU / g) 0.4-1.6 kg,

[0013] 0.05-0.2 kg of *Lactobacillus acidophilus* at a concentration of 200 million CFU / g.

[0014] 0.05-0.2 kg of 200 million / g of *Brevibacterium casei*;

[0015] 4) Fermentation treatment shall be carried out under the following conditions: At room temperature, air shall be introduced into the treatment tank for 60-84 hours to supply oxygen, allowing the compound bacteria to fully digest the harmful substances in the livestock and poultry urine; the air flow rate shall be 0.01 m³ / ton of liquid. 3 / min;

[0016] 5) After fermentation for 2-4 days, odorless and harmless liquid fertilizer is obtained.

[0017] The solid-liquid separation in step 1) is completed on a vibrating screen with a mesh size of 80 or higher, used to separate solids from liquids in livestock and poultry manure.

[0018] The carbon source in the microbial culture in step 3) is one or more of lactose, sucrose, maltose, starch, and glucose, and the mixing ratio of these substances is arbitrary.

[0019] In step 4), air is introduced into the treatment tank through a blower and pipes to carry out aerobic fermentation.

[0020] Compared with existing technologies, this invention has the following advantages and effects: Using the above technical solution, only a small amount of microbial strains and a small amount of propagating agents are needed to continuously multiply the microbial strains during aerobic fermentation. These multiplied strains then fully digest harmful substances in livestock and poultry urine, significantly reducing the emission of malodorous gases from the urine and effectively reducing odor pollution to the surrounding environment, thus improving air quality. Through aerobic fermentation, pathogens, parasite eggs, and weed seeds are effectively killed, reducing the risk of disease transmission and ensuring agricultural production safety and public health. Furthermore, when used rationally, the fermented products can reduce the flow of nutrients such as nitrogen and phosphorus into water bodies and soil. Compared to anaerobic fermentation, aerobic fermentation has a faster decomposition rate and can complete the treatment process in a shorter time. Since the treatment is carried out in an open environment, no toxic or harmful gases are left behind, making the production process extremely safe. The treated product contains a large number of beneficial microorganisms. When applied to the soil, it can increase the content of beneficial microorganisms, improve soil aeration and water retention, and enhance soil fertility and structural stability. The treated liquid can be directly used in facility agriculture, making it convenient for promotion and application. The treatment equipment only requires a screening machine, treatment tank, blower, and pipelines, resulting in low investment and low operating costs. It enables large-scale, harmless, efficient, and rapid treatment of livestock and poultry urine. Detailed Implementation

[0021] The present invention will be further described below with reference to embodiments. Example 1

[0022] A method for large-scale, harmless treatment of pig urine includes the following steps:

[0023] 1) Feed the pig manure and urine into an 80-mesh vibrating screen to separate the solids from the liquids;

[0024] 2) The collected and screened 1000 tons of pig urine liquid is sent into an open treatment tank with a length × width × depth of 30m × 12m × 4m. The solid residue is used separately.

[0025] 3) Add 0.5 kg of bacterial inoculum and 2 kg of progenitor bacteria per ton of pig urine to the treatment tank, where:

[0026] The proliferator is a mixture of the following components in the following mass ratio: carbon source: amino acids: B vitamins = 1:0.8:0.2, and the carbon source is lactose, sucrose, and maltose in a ratio of 1:1:1;

[0027] The bacterial strain is a compound bacterial agent with an effective live bacteria count of 2 billion / g:

[0028] 0.4 kg of Nocardia white bacillus with a concentration of 1.6 billion CFU / g;

[0029] 0.05 kg of Lactobacillus acidophilus with a concentration of 200 million CFU / g;

[0030] 0.05 kg of 200 million / g of *Brevibacterium casei*;

[0031] 4) Fermentation is carried out under the following conditions: At room temperature, air is blown into the treatment tank through a Roots blower and pipelines to supply oxygen for 84 hours, allowing the compound bacteria to fully digest harmful substances in the fecal liquid; the air flow rate is 0.01 m³ / ton of liquid. 3 / min;

[0032] 5) After 4.5 days of fermentation, odorless and harmless liquid fertilizer is obtained. Example 2

[0033] A method for large-scale, harmless treatment of pig manure and urine includes the following steps:

[0034] 1) The collected and screened 1000 tons of pig urine liquid is sent into an open treatment tank with a length × width × depth of 30m × 12m × 4m. The solid residue is used separately.

[0035] 2) Collect and screen the pig urine liquid and send it into an open aerobic treatment tank; use the solid residue separately.

[0036] 3) Add 2 kg of bacterial inoculum and 5 kg of probiotics per ton of pig urine to the treatment tank, where:

[0037] The proliferator is a mixture of the following components in the following mass ratio: carbon source: amino acids: B vitamins = 3: 1.5: 0.5, and the carbon source is lactose, sucrose, and maltose in a ratio of 1:2:1;

[0038] The bacterial strain is a compound bacterial agent with an effective live bacteria count of 2 billion / g:

[0039] 1.6 billion / g of Nocardia white bacillus;

[0040] 0.2 kg of Lactobacillus acidophilus with a concentration of 200 million CFU / g;

[0041] 0.2 kg of 200 million / g of *Brevibacterium casei*;

[0042] 4) Fermentation is carried out under the following conditions: At room temperature, air is blown into the treatment tank through a Roots blower and pipelines to supply oxygen for 60 hours, allowing the compound bacteria to fully digest harmful substances in the fecal liquid; the air flow rate is 0.01 m³ / ton of liquid. 3 / min;

[0043] 5) After 2 days of fermentation, odorless and harmless liquid fertilizer is obtained. Example 3

[0044] A method for large-scale, harmless treatment of pig manure and urine includes the following steps:

[0045] 1) The collected and screened 1000 tons of pig urine liquid is sent into an open treatment tank with a length × width × depth of 30m × 12m × 4m. The solid residue is used separately.

[0046] 2) Collect and screen the pig urine liquid and send it into an open aerobic treatment tank; use the solid residue separately.

[0047] 3) Add 1 kg of bacterial inoculum and 2.5 kg of progenitor bacteria per ton of pig urine to the treatment tank, where:

[0048] The proliferating culture is a mixture of the following components in the following mass ratio: carbon source: amino acids: B vitamins = 1.5:0.8:0.2; the carbon source is sucrose, starch, and glucose in a ratio of 1:2:3.

[0049] The bacterial strain is a compound bacterial agent with an effective live bacteria count of 2 billion / g:

[0050] 0.85 kg of Nocardia white bacillus with a concentration of 1.6 billion CFU / g;

[0051] 0.08 kg of Lactobacillus acidophilus with a concentration of 200 million CFU / g;

[0052] 0.07 kg of 200 million / g of *Brevibacterium casei*;

[0053] 4) Fermentation treatment is carried out under the following conditions: At room temperature, air is introduced into the treatment tank for 72 hours to supply oxygen, allowing the compound bacteria to fully digest harmful substances in the livestock and poultry urine; the air flow rate is 0.01 m³ / ton of liquid. 3 / min;

[0054] 5) After 3 days of fermentation, odorless and harmless liquid fertilizer is obtained.

[0055] The comparison indicators are as follows:

[0056] Indicators of pig urine before treatment:

[0057] pH: 7.6, Escherichia coli (cFU / ml): >2400, Ascaris egg mortality rate (%): 76, Total chromium (mg / kg): 0.2, Other heavy metals: Not detected.

[0058] The fermentation broth parameters after treatment with this invention are as follows:

[0059] N content (g / L): 5.3, P2O5 (g / L): 1.5, K2O (g / L): 2.4, Total nutrient content (g / L): 9.2, Organic matter (g / L): 27.2, Copper (g / L): 0.03, Iron (g / L): 0.07, Manganese (g / L): 0.02, Zinc (g / L): 0.5, Trace elements (g / L): 0.65, Magnesium (g / L): 1.7, Calcium (g / L): 16.9, Medium elements (g / L): 18.6, pH: 7.11, Coliform bacteria (cFU / ml): Negative, Ascaris egg mortality rate (%): Not detected, Other heavy metals: Not detected.

[0060] The present invention, in its embodiments 1-3, is applied to leafy vegetables, resulting in vigorous growth, thick and tender leaves, and a 20% increase in yield compared to the original yield. At the same time, the quality is improved, with better taste and richer nutrition.

[0061] Therefore, the method provided by this invention can not only effectively treat livestock and poultry urine, but also the treated livestock and poultry urine has a good fertilizing effect. In particular, only a small amount of bacterial strains and propagating agents are needed to continuously multiply the bacterial strains during the aerobic fermentation process. The multiplied bacterial strains then fully digest the harmful substances in the livestock and poultry urine, significantly reducing the emission of malodorous gases from the livestock and poultry urine and effectively reducing the odor pollution it causes to the surrounding environment. At the same time, the large-scale liquid stirring and fermentation are completed by blowing in air, which saves time and effort. It only takes about 3 days to complete the treatment of a large volume (thousand tons) of livestock and poultry urine, and fully realizes the efficient treatment of livestock and poultry urine on a large scale and in a harmless manner.

Claims

1. A method for large-scale, harmless treatment of livestock and poultry urine, characterized in that... Includes the following steps: 1) Separate the solid and liquid components of livestock and poultry manure; 2) The liquid after solid-liquid separation is sent into an open treatment tank; 3) Add 0.5–2 kg of inoculum and 2–5 kg of propagated microorganisms per ton of liquid to the treatment tank, wherein: The proliferative fungus consists of the following components in the following mass ratio: Carbon source: Amino acids: B vitamins = 1-3 : 0.8-1.5 : 0.2-0.5; The carbon source is one or more of lactose, sucrose, maltose, starch, and glucose, and the mixing ratio of these sources is arbitrary. The bacterial strains are the following compound bacterial agents: Nocardia white bacillus (1.6 billion CFU / g) 0.4-1.6 kg, 0.05-0.2 kg of *Lactobacillus acidophilus* at a concentration of 200 million CFU / g. 0.05-0.2 kg of 200 million / g of *Brevibacterium casei*; 4) At room temperature, air is blown into the treatment tank through a blower and pipes for oxygen-supplyed fermentation. The oxygen supply time is 60-84 hours, so that the compound bacteria can fully digest the harmful substances in the livestock and poultry urine. The air flow rate is 0.01 m³ / min per ton of liquid. 5) After fermentation for 2-4 days, odorless and harmless liquid fertilizer is obtained.

2. The method for large-scale, harmless treatment of livestock and poultry urine as described in claim 1, characterized in that: The solid-liquid separation in step 1) is completed on a vibrating screen with a mesh size of 80 or higher, used to separate solids from liquids in livestock and poultry manure.