Livestock and poultry manure wastewater-vegetable waste fermentation system

Abstract

The utility model discloses a livestock and poultry manure wastewater-vegetable waste fermentation system, which relates to the technical field of fermentation equipment, and comprises a primary fermentation tank, a primary mixed fermentation tank and a secondary mixed fermentation tank, a liquid outlet of the primary fermentation tank is communicated with the primary mixed fermentation tank and is used for conveying vegetable fermentation liquor to the primary mixed fermentation tank, and the primary mixed fermentation tank is used for mixing livestock and poultry manure wastewater and the vegetable fermentation liquor for anaerobic fermentation; a liquid outlet of the first-stage mixed fermentation tank is communicated with the second-stage mixed fermentation tank and is used for conveying mixed fermentation liquid to the second-stage mixed fermentation tank for anaerobic fermentation, so that the pH value of a fermented fertilizer of vegetable wastes can be reduced, and the content of plant pathogenic bacteria can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fermentation equipment, in particular to a livestock and poultry excrement wastewater-vegetable waste fermentation system. Background Art

[0002] my country's vegetable planting area reached 19.64 million hm2 2 , with an annual output of 679.297 million tons. The amount of waste generated in the vegetable planting industry is relatively large; vegetable waste refers to daily vegetable waste, including roots, stems, leaves, rotten fruits and tail vegetables that have no commercial value and are discarded during product harvesting and processing. Vegetable waste has a high water content and is rich in nutrients. According to statistics, the amount of vegetable waste in my country is about 100 to 150 million tons per year. The nutrients contained in these vegetable wastes are equivalent to 690,000 tons of fertilizer (N), 73,000 tons of phosphorus (P2O5), and 370,000 tons of potassium (K2O). Vegetable waste has the characteristics of high moisture content, organic matter and nutrients. The moisture content of vegetable waste is generally between 75% and 94.8%, and the pH range is 6.00 to 9.23. Calculated on a dry basis, the total nitrogen (TN) content of the waste is 2.02% to 5.69%, the total phosphorus (TP) content is 0.29% to 3.25%, the total potassium (TK) content is 0.49% to 5.37%, and the carbon-nitrogen ratio is between 8.27 and 22.35; the solid content of vegetable waste is between 8% and 19%, including 75% sugars and hemicellulose, 9% cellulose and 5% lignin. Therefore, the fertilizer formed by the fermentation of vegetable waste has extremely high utilization value.

[0003] However, due to the high moisture content, low carbon-nitrogen ratio, and high load of plant pathogens and insect eggs in vegetable waste, it is difficult to achieve a harmless effect by returning it to the field in situ, which affects the growth of the next crop. High-temperature composting requires the addition of other auxiliary materials to adjust the carbon-nitrogen ratio and prevent leachate from being produced during the fermentation process, otherwise it is difficult to reach a high temperature. In the past, the fermentation process of using biogas slurry as fertilizer first fermented biogas, and the biogas slurry was used as the residue after fermenting biogas. The biogas fermentation process is relatively complicated, with high requirements on equipment and material conditions, high cost and low benefit, and it is difficult to promote and apply it in actual production. Utility Model Content

[0004] The purpose of the utility model is to provide a livestock and poultry manure wastewater-vegetable waste fermentation system to solve the problems existing in the above-mentioned prior art and meet the needs of harmless treatment of agricultural waste in areas where farming and breeding are combined. Combined and anaerobic fermentation can reduce the pH value of the biogas slurry and reduce the content of plant pathogens and insect eggs.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides a livestock and poultry excrement wastewater-vegetable waste fermentation system, comprising a primary fermentation tank, a primary mixed fermentation tank and a secondary mixed fermentation tank, wherein the primary fermentation tank is used for anaerobic fermentation of vegetable waste, a liquid discharge port of the primary fermentation tank is connected with the primary mixed fermentation tank for conveying vegetable fermentation liquid to the primary mixed fermentation tank, the primary mixed fermentation tank is used for mixing livestock and poultry excrement wastewater and vegetable fermentation liquid for anaerobic fermentation, and the liquid discharge port of the primary mixed fermentation tank is connected with the secondary mixed fermentation tank for conveying mixed fermentation liquid to the secondary mixed fermentation tank for anaerobic fermentation and aging.

[0007] Preferably, a stirring device is provided in the primary mixed fermentation tank.

[0008] Preferably, the primary mixed fermentation tank is connected to a timed aeration device.

[0009] Preferably, a filter screen is provided at the discharge port of the primary fermentation tank and the discharge port of the first-level mixed fermentation tank.

[0010] Preferably, it further comprises a mixing tank, the discharge port of the secondary mixing fermentation tank is connected to the mixing tank, and the mixing tank is provided with a water injection port to dilute the fermentation liquid.

[0011] Preferably, the primary fermentation tank is located above ground, and the first-level mixed fermentation tank and the second-level mixed fermentation tank are both located underground.

[0012] Preferably, the discharge port of the secondary mixed fermentation tank is connected to the blending tank through a filtering device.

[0013] Compared with the prior art, the utility model has achieved the following technical effects:

[0014] The utility model provides a livestock and poultry manure wastewater-vegetable waste fermentation system, which achieves solid-liquid separation after primary fermentation of vegetable waste, and the primary vegetable fermentation liquid and poultry manure wastewater are fermented in a semi-anaerobic environment in a primary mixed fermentation tank with ventilation for 30 minutes every 1 hour, so that part of the ammonium nitrogen produced in the anaerobic environment of the waste can be oxidized to nitrate nitrogen, and at the same time, aerobic conditions also accelerate the fermentation rate, and also reduce the excessive pH of the biogas slurry caused by the main product of ammonium nitrogen in the anaerobic environment. The alternation of anaerobic and aerobic conditions is also conducive to the killing of different harmful pathogenic microorganisms carried by the waste. The mixed fermentation liquid produced in the primary mixed fermentation tank is subjected to secondary fermentation and aging in the secondary mixed tank, which can further reduce the harmful substances and degradation of the waste fermentation liquid and improve the utilization effect of the biogas slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the structure of the livestock and poultry excrement wastewater-vegetable waste fermentation system provided by the utility model;

[0017] In the figure: 1-primary fermentation tank, 2-first-level mixed fermentation tank, 3-secondary mixed fermentation tank, 4-stirring equipment, 5-timing aeration equipment, 6-motor pump, 7-filter screen, 8-filter equipment, 9-mixing tank, 10-water injection port. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] The utility model aims to provide a livestock and poultry manure wastewater-vegetable waste fermentation system to solve the problems existing in the above-mentioned prior art, and can reduce the pH value of the fermented biogas slurry of vegetable waste and reduce the content of plant pathogens.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] The utility model provides a livestock and poultry excrement wastewater-vegetable waste fermentation system, such as Figure 1As shown, the livestock and poultry manure wastewater-vegetable waste fermentation system includes a primary fermentation tank 1, a primary mixed fermentation tank 2, a secondary mixed fermentation tank 3 and a mixing tank 9. The primary mixed fermentation tank 2 and the secondary mixed fermentation tank 3 are both located underground. The primary fermentation tank 1 is used for anaerobic fermentation of vegetable waste. The primary fermentation tank 1 is located above ground. Since the vegetable waste contains a large amount of plant cellulose, a large amount of residue will be produced after the fermentation is completed, which is convenient for cleaning. The discharge port of the primary fermentation tank 1 is connected to the primary mixed fermentation tank 2 through a pipeline for conveying vegetable fermentation liquid to the primary mixed fermentation tank 2. The primary mixed fermentation tank 2 is used for mixing livestock and poultry manure wastewater and vegetable fermentation liquid for anaerobic fermentation. The primary mixed fermentation tank 2 is connected to a timed aeration device 5 for conveying to the primary mixed fermentation tank 2 Air, the timed aeration device 5 is specifically an air pump, and a stirring device 4 is provided in the first-level mixing fermentation tank 2 for fully mixing the vegetable fermentation liquid with the livestock and poultry manure wastewater to improve the fermentation efficiency. Specifically, the stirring device 4 is a prior art and is not described in detail here; the discharge port of the first-level mixing fermentation tank 2 is connected with the second-level mixing fermentation tank 3 through a pipeline and a motor pump 6 for conveying the mixed fermentation liquid to the second-level mixing fermentation tank 3 for secondary fermentation and aging storage, and a filter screen 7 is provided at the discharge port of the primary fermentation tank 1 and the discharge port of the first-level mixing fermentation tank 2 for coarse filtration of the fermentation residue; the discharge port of the second-level mixing fermentation tank 3 is connected with the mixing tank 9 through a pipeline with a motor pump 6 through a filtering device 8, and the mixing tank 9 is provided with a water injection port 10 to dilute the fermented slurry.

[0022] During the specific implementation process, (1) vegetable waste and microbial agents are first added to the primary fermentation tank 1 on the ground for fermentation; (2) pig farm manure waste liquid and microbial agents are added to the primary mixed fermentation tank 2, and then the fermented liquid from the vegetable waste is discharged into the primary mixed fermentation tank 2 through the discharge port with a filter screen 7 at the bottom to ferment simultaneously with the pig farm manure waste liquid. During the fermentation process, the primary mixed fermentation tank 2 is automatically ventilated and oxygenated for 30 minutes every 2 hours through the timing aeration device 5 and stirred through the stirring device 4; (3) the mixed fermentation liquid fermented in the primary mixed fermentation tank 2 is filtered through the filter screen 7 and then enters the secondary mixed fermentation tank 3 for fermentation; (4) the fermented liquid in the secondary mixed fermentation tank 3 is filtered by the filtering device 8, and then diluted and mixed with water in the mixing tank 9 in proportion according to the crop growth period and nutrient requirements, and finally applied through the water-fertilizer integrated pipeline.

[0023] Effect of implementation case: After aerated semi-anaerobic fermentation, the pH of the biogas slurry dropped from 8.5-9.0 in anaerobic fermentation to 7.2-7.6. No root-knot nematodes, wilt disease, root rot and other pathogens were detected. The primary fermentation time was shortened from 30-40 days to 20-30 days.

[0024] The above-mentioned livestock and poultry manure wastewater-vegetable waste fermentation system adopts the method of fermenting vegetable fermentation liquid and poultry manure wastewater simultaneously in a primary mixed fermentation tank 2, and the mixed fermentation liquid produced by the primary mixed fermentation tank 2 is subjected to secondary fermentation in a secondary mixed tank, which can reduce the pH value of the vegetable waste fermentation liquid, facilitate improving its utilization rate in the soil, and can reduce the content of plant pathogens, thereby improving the safety of the product. The utility model uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method of the utility model and its core idea; at the same time, for those skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be construed as a limitation on the utility model.

Claims

1. A livestock and poultry manure wastewater-vegetable waste fermentation system, characterized in that: include: A primary fermentation tank, a primary mixed fermentation tank and a secondary mixed fermentation tank, wherein the primary fermentation tank is used for anaerobic fermentation of vegetable waste, the discharge port of the primary fermentation tank is connected with the primary mixed fermentation tank for conveying vegetable fermentation liquid to the primary mixed fermentation tank, the primary mixed fermentation tank is used for mixing livestock and poultry manure wastewater and vegetable fermentation liquid for anaerobic fermentation, the discharge port of the primary mixed fermentation tank is connected with the secondary mixed fermentation tank for conveying mixed fermentation liquid to the secondary mixed fermentation tank for anaerobic fermentation and aging; The first-level mixed fermentation tank is provided with a stirring device; The primary mixed fermentation tank is connected to a timed aeration device; A filter screen is provided at the discharge port of the primary fermentation tank and the discharge port of the first-level mixed fermentation tank; It also includes a mixing tank, the discharge port of the secondary mixing fermentation tank is connected to the mixing tank, and the mixing tank is provided with a water injection port to dilute the fermentation liquid.

2. The livestock and poultry excrement wastewater-vegetable waste fermentation system according to claim 1, characterized in that: The primary fermentation tank is located above ground, and the first-level mixed fermentation tank and the second-level mixed fermentation tank are both located underground.

3. The livestock and poultry excrement wastewater-vegetable waste fermentation system according to claim 1, characterized in that: The liquid discharge port of the secondary mixed fermentation tank is connected with the blending tank through a filtering device.

Images