Carbon and nitrogen loss prevention, control and purification system for breeding manure fermentation biogas slurry

Abstract

The utility model discloses a carbon and nitrogen loss prevention, control and purification system for breeding manure fermentation biogas slurry, which comprises a black film fermentation biogas digester, a carbon and nitrogen loss prevention and purification system, a carbon and nitrogen loss prevention and purification system, a carbon and nitrogen loss prevention and purification system, a carbon and nitrogen loss prevention and purification system and a carbon and nitrogen loss prevention and purification system, the filter tank is arranged on one side of the black membrane fermentation biogas digester and receives biogas slurry in the black membrane fermentation biogas digester, and a discharge pipe is arranged on one side of the filter tank; the sedimentation tank is arranged below one side of the filter tank and receives the biogas slurry discharged by the discharge pipe; the precipitant storage tank is arranged on the outer side of the sedimentation tank, is connected with the sedimentation tank through a pipeline and provides a precipitant required by heavy metal sedimentation; a liquid discharge pipe is arranged on one side of the sedimentation tank, and purified biogas slurry discharged by the liquid discharge pipe is placed on the black film covering layer and provides a survival basis for phytoplankton; the pressure generated by the biogas in the black film fermentation biogas digester and the stress of the purified biogas slurry above the black film covering layer are balanced, and a double-layer carbon and nitrogen loss control system is formed, so that the carbon and nitrogen emission of the biogas slurry is reduced, and the utilization rate of the biogas slurry is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of biogas slurry treatment, in particular to a system for controlling carbon and nitrogen loss and purifying fermentation biogas slurry of breeding manure and sewage. Background Art

[0002] In recent years, the large-scale and intensive development of livestock and poultry breeding industry in China has been rapid. If livestock and poultry manure and sewage are not treated in time and properly, they will cause pollution to the atmosphere, soil and water environment, and pose potential risks to human and animal health. A large number of studies have proved that the storage of livestock and poultry fermentation biogas slurry is an important part of agricultural greenhouse gas emissions. During the storage of biogas slurry, carbon and nitrogen gases such as CO2, CH4, N2O, NO, and NH3 are emitted simultaneously. Therefore, preventing the emission of carbon and nitrogen gases during the storage of biogas slurry is of great significance for reducing agricultural greenhouse gas emissions.

[0003] In addition, biogas slurry is a high-quality water-soluble fertilizer, containing trace elements such as nitrogen, phosphorus, and potassium, as well as nutrients such as amino acids, auxins, and gibberellins. Biogas slurry is mainly used for applying to rice, wheat, fruits and vegetables, seed soaking, foliar fertilizer spraying, cultivating flowers, and nutrient solution for soilless cultivation. At the same time, biogas slurry also contains some heavy metal elements, which are likely to have an adverse impact on crops when used.

[0004] Existing biogas slurry purification devices purify organic matter and some non-metallic impurities in biogas slurry, and it is difficult to purify heavy metal elements therein.

[0005] Therefore, how to provide a system for controlling carbon and nitrogen loss and purifying fermentation biogas slurry of breeding manure and sewage is an urgent problem to be solved by those skilled in the art. Content of the Utility Model

[0006] In view of this, the utility model provides a system for controlling carbon and nitrogen loss and purifying fermentation biogas slurry of breeding manure and sewage, which can achieve carbon emission reduction in biogas digesters, fully purify biogas slurry, and complete the reuse of biogas slurry.

[0007] In order to achieve the above object, the utility model adopts the following technical scheme: A system for controlling carbon and nitrogen loss and purifying fermentation biogas slurry of breeding manure and sewage, which includes:

[0008] A black film fermentation biogas digester, the inside of the black film fermentation biogas digester is filled with breeding manure water, and the black film fermentation biogas digester is provided with a black film covering layer;

[0009] A filter tank, the filter tank is arranged on one side of the black film fermentation biogas digester and receives the biogas slurry in the black film fermentation biogas digester, and a discharge pipe is arranged on one side of the filter tank;

[0010] A sedimentation tank, the sedimentation tank is arranged below one side of the filter tank and receives the biogas slurry discharged from the discharge pipe;

[0011] A precipitant storage tank is arranged outside the sedimentation tank. The precipitant storage tank is connected to the sedimentation tank through a pipeline and provides a precipitant required for heavy metal precipitation.

[0012] A drain pipe is provided on one side of the sedimentation tank. The purified biogas slurry discharged from the drain pipe is placed on the black film covering layer to provide a survival basis for phytoplankton. The pressure generated by the biogas inside the black film fermentation biogas digester is balanced with the force exerted by the purified biogas slurry above the black film covering layer to form a double-layer carbon and nitrogen loss control system.

[0013] The beneficial effects of the present utility model are as follows: Biogas slurry is generated by the black film fermentation biogas digester. The biogas slurry then enters the filtration tank for preliminary filtration and is discharged as purified biogas slurry after precipitation in the sedimentation tank. The purified biogas slurry is in turn injected onto the black film covering layer to form a concave pond, providing a basis for the production of phytoplankton, which is fish feed. The black film covering layer can prevent the emission of carbon and nitrogen gases generated by the biogas digester. In addition, the purified biogas slurry on the black film covering layer can also be in force balance with the pressure generated by the biogas inside the biogas digester. The purified biogas slurry can be returned to the field for treatment or used for aquaculture treatment, making full use of the value of the biogas slurry, reducing carbon and nitrogen emission pollution, and the present model has the characteristics of high purification degree, fast efficiency, and convenient use.

[0014] Preferably, the black film fermentation biogas digester is an outdoor tank. The black film fermentation biogas digester is regularly supplemented with breeding manure water inside. According to the gas production fermentation situation, manure fermentation bacteria agents are regularly added to the black film fermentation biogas digester to promote the anaerobic fermentation and decomposition of the manure water to generate biogas slurry.

[0015] The resulting technical effects are as follows: The outdoor tank can give full play to the area advantage, increase the output of biogas slurry treatment, and also increase the volume of phytoplankton production, which is fish feed.

[0016] Preferably, filter meshes are arranged at intervals inside the filtration tank, and biochar for enhancing the filtration effect is filled between the filter meshes.

[0017] The resulting technical effects are as follows: The primary filtration of the biogas slurry is completed by using the filter meshes, which can first filter out large particle impurities in the biogas slurry to avoid the impurities affecting the subsequent precipitation process of heavy metal elements.

[0018] Preferably, a synchronous plate is fixed between the filter meshes and near the edge position. A slide rail is vertically provided on the inner side wall of the filtration tank. A slider is fixedly connected to the outer side of the synchronous plate, and the slider is slidably connected to the slide rail.

[0019] The resulting technical effects are as follows: The filter mesh can be removed by utilizing the relationship between the slider and the slide rail, which is convenient for cleaning or replacing the filter mesh to avoid the filter mesh being blocked and affecting the filtration effect.

[0020] Preferably, a valve is connected to the discharge pipe, a support assembly for increasing the height is fixed at the bottom of the filtration tank, and the biogas slurry in the black film fermentation biogas digester is sent into the filtration tank by a water pump.

[0021] The resulting technical effect is that the automatic external discharge of biogas slurry is realized by using the liquid level difference, and then the biogas slurry enters the sedimentation tank to complete the precipitation of heavy metal elements.

[0022] Preferably, a stirring assembly is rotatably connected in the sedimentation tank. The stirring assembly includes a stirring shaft, stirring rods, stirring plates and a stirring motor. The stirring shaft is rotatably connected to the inner side walls at both ends of the sedimentation tank. One end of the stirring shaft passes through the side wall of the sedimentation tank and is in transmission connection with the output shaft of the stirring motor outside. The stirring motor is fixed to the outside of the sedimentation tank through a bracket. There are multiple groups of stirring rods and they are fixedly arranged side by side at intervals on the outer side wall of the stirring shaft. The stirring plates are arranged parallel to the stirring shaft and are fixedly connected to multiple groups of stirring rods.

[0023] The resulting technical effect is that the stirring assembly can fully mix the precipitant with the biogas slurry, thereby improving the reduction and precipitation effect of heavy metals and ensuring that the heavy metal elements in the biogas slurry can be precipitated and removed.

[0024] Preferably, a metering pump is connected to the pipeline between the precipitant storage tank and the sedimentation tank.

[0025] The resulting technical effect is that the metering pump accurately adds the precipitant into the sedimentation tank, fully exerts the role of the precipitant, and avoids waste.

[0026] Preferably, the purified biogas slurry on the black film covering layer is used for field fertilization or aquaculture treatment.

[0027] The resulting technical effect is that the purified biogas slurry can be used for field fertilization, reducing the amount of chemical fertilizers used in farmland, increasing the content of soil organic carbon, and promoting the cycle of planting and breeding; it can also be used for aquaculture. The purified biogas slurry fertilizer contains nitrogen, phosphorus, potassium, amino acids, trace elements, etc. It promotes the growth of phytoplankton used as fish bait and will not cause pollution to the fish water quality. The number of phytoplankton in the water body increases rapidly, which is also beneficial to the growth of silver carp and bighead carp, purifying the biogas slurry and reducing the carbon and nitrogen loss of the biogas slurry. Description of the Drawings

[0028] Figure 1 It is a structural diagram of a system for controlling and purifying carbon and nitrogen loss of biogas slurry fermented from breeding manure pollution of the present utility model;

[0029] Figure 2 It is a layout diagram of a filtration tank and a sedimentation tank of a system for controlling and purifying carbon and nitrogen loss of biogas slurry fermented from breeding manure pollution of the present utility model;

[0030] Figure 3 It is a partial enlarged view of A;

[0031] Figure 4 It is a partial enlarged view at B;

[0032] Figure 5 It is a partial enlarged view at C;

[0033] Figure 6 It is a cross-sectional view of the black film fermentation biogas digester of a system for controlling carbon and nitrogen loss and purifying biogas slurry from breeding manure pollution according to the present utility model.

[0034] 1. Black film fermentation biogas digester, 2. Black film covering layer, 3. Purified biogas slurry, 4. Breeding manure water, 5. Filter tank, 6. Discharge pipe, 7. Valve, 8. Filter screen, 9. Synchronous plate, 10. Slide block, 11. Slide rail, 12. Sedimentation tank, 13. Stirring assembly, 131. Stirring shaft, 132. Stirring rod, 133. Stirring plate, 134. Stirring motor, 14. Precipitant storage tank, 15. Metering pump, 16. Bracket, 17. Support assembly. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0036] Refer to the attached drawings of the present utility model Figures 1 to 6 , according to an embodiment of the present utility model, a system for controlling carbon and nitrogen loss and purifying biogas slurry from breeding manure pollution includes:

[0037] The black film fermentation biogas digester 1 can be opened in an open space with a relatively large area. The inside of the black film fermentation biogas digester is filled with breeding manure water 4. The pool wall of the biogas digester can be waterproofed. There is a black film covering layer 2 on the black film fermentation biogas digester 1. In fact, the black film covering layer covers the upper part of the breeding manure water and does not exceed the top opening of the biogas digester;

[0038] The filter tank 5 is arranged on one side of the black film fermentation biogas digester 1 and receives the biogas slurry in the black film fermentation biogas digester. There is a discharge pipe 6 on one side of the filter tank 5;

[0039] The sedimentation tank 12 is arranged below one side of the filter tank 5 and receives the biogas slurry discharged from the discharge pipe;

[0040] The precipitant storage tank 14 is arranged outside the sedimentation tank 12. The precipitant storage tank 14 is connected to the sedimentation tank 12 through pipelines and provides the precipitant required for heavy metal precipitation;

[0041] On one side of the sedimentation tank 12, a liquid discharge pipe is provided, and the purified biogas slurry 3 discharged from the liquid discharge pipe is placed on the black film covering layer 2 to provide a survival basis for phytoplankton; the pressure generated by the biogas inside the black film fermentation biogas digester 1 is balanced with the force of the purified biogas slurry above the black film covering layer to form a carbon and nitrogen loss control system.

[0042] After the breeding manure water ferments in the black film anaerobic fermentation tank for a period of time, a collapse forms on the black film covering layer. An appropriate amount of purified biogas slurry is added at the collapse, that is, the upward air pressure generated by the biogas in the black film anaerobic tank is balanced with the gravity generated by the purified biogas slurry and aquatic feed plants on the black film covering layer. In this way, a carbon and nitrogen loss control system for the double-layer black film anaerobic fermentation tank and aquatic feed is constructed, increasing the water storage capacity and the planting area of aquatic feed, helping to improve the added value of biogas slurry and reduce carbon and nitrogen losses.

[0043] In some other embodiments, the black film fermentation biogas digester 1 is an outdoor tank, and breeding manure water is regularly supplemented inside the black film fermentation biogas digester 1. According to the gas production fermentation situation, manure fermentation bacteria agents are regularly added into the black film fermentation biogas digester 1 to promote the anaerobic fermentation and decomposition of manure water to produce biogas slurry.

[0044] In some other specific embodiments, filter meshes 8 are arranged at intervals inside the filter tank 5, and biochar for enhancing the filtering effect is filled between the filter meshes 8 to improve the primary filtering effect.

[0045] In some other embodiments, a synchronous plate 9 is fixed between the filter meshes 8 and near the edge position. A slide rail 11 is vertically arranged on the inner side wall of the filter tank 5. A slider 10 is fixedly connected to the outer side of the synchronous plate 9, and the slider 10 is slidably connected to the slide rail 11, which is convenient for disassembling the filter mesh to complete cleaning or replacement.

[0046] In some other specific embodiments, a valve 7 is connected to the discharge pipe 6, and a support assembly 17 for increasing the height is fixed at the bottom of the filter tank 5. The biogas slurry in the black film fermentation biogas digester 1 is pumped into the filter tank 5 by a water pump.

[0047] In some other specific embodiments, a stirring assembly 13 is rotatably connected inside the sedimentation tank 12. The stirring assembly 13 includes a stirring shaft 131, stirring rods 132, stirring plates 133 and a stirring motor 134. The stirring shaft 131 is rotatably connected to the inner side walls at both ends of the sedimentation tank 12. One end of the stirring shaft 131 passes through the side wall of the sedimentation tank and is in transmission connection with the output shaft of the stirring motor outside. The stirring motor 134 is fixed outside the sedimentation tank 12 through a bracket 16. There are multiple groups of stirring rods 132 and they are fixedly arranged side by side at intervals on the outer side wall of the stirring shaft 131. The stirring plates 133 are arranged parallel to the stirring shaft 131 and are fixedly connected to multiple groups of stirring rods 132.

[0048] In some other embodiments, a metering pump 15 is connected to the pipeline between the precipitant storage tank 14 and the sedimentation tank 12. The metering pump can accurately pump a predetermined amount of precipitant into the sedimentation tank.

[0049] By adding a precipitant to the sedimentation tank, the heavy metal elements in the biogas slurry are reduced and precipitated. At the same time, the stirring assembly 13 enables the precipitant to be fully mixed with the biogas slurry, ensuring that all the heavy metals contained in the biogas slurry in the sedimentation tank can be precipitated and removed, which is beneficial to improving the purification degree and purification efficiency.

[0050] In some other specific embodiments, the purified biogas slurry 3 on the black film covering layer 2 is used for returning to the field for fertilization or aquaculture treatment.

[0051] In addition, the purified biogas slurry can enter the segmented modular planting and breeding circular greenhouse wetland to produce high-quality green forages such as edible water spinach and watercress, further bioconverting the biogas slurry, reducing carbon emissions, and fixing nitrogen.

[0052] For the devices and methods disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For the relevant parts, refer to the description in the method section.

[0053] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A system for controlling and purifying carbon and nitrogen losses in fermented biogas slurry from livestock manure, characterized in that: include: A black film fermentation biogas tank (1), wherein the interior of the black film fermentation biogas tank (1) contains aquaculture manure (4), and a black film covering layer (2) is provided on the black film fermentation biogas tank (1); A filter tank (5), the filter tank (5) being arranged on one side of the black film fermentation biogas tank (1) and receiving the biogas slurry in the black film fermentation biogas tank, and a discharge pipe (6) being provided on one side of the filter tank (5); A sedimentation tank (12), the sedimentation tank (12) being arranged below one side of the filter tank (5) and receiving the biogas slurry discharged from the discharge pipe; A precipitant storage tank (14), the precipitant storage tank (14) being arranged outside the sedimentation tank (12), the precipitant storage tank (14) being connected to a pipeline of the sedimentation tank (12) and providing the precipitant required for heavy metal precipitation; A drainage pipe is provided on one side of the sedimentation tank (12), and the purified biogas (3) discharged from the drainage pipe is placed on the black film covering layer (2) and provides a survival basis for phytoplankton; the pressure generated by the biogas inside the black film fermentation biogas tank (1) is balanced with the force of the purified biogas above the black film covering layer to form a double-layer carbon and nitrogen loss control system.

2. A system for controlling and purifying carbon and nitrogen losses in fermented biogas slurry from livestock manure according to claim 1, characterized in that: The black film fermentation biogas tank (1) is an outdoor tank. The black film fermentation biogas tank (1) is regularly supplemented with aquaculture manure water. According to the gas production fermentation situation, manure fermentation bacteria are regularly added into the black film fermentation biogas tank (1) to promote anaerobic fermentation and decomposition of manure water to produce biogas slurry.

3. The system for controlling and purifying carbon and nitrogen losses in fermented biogas slurry from livestock manure according to claim 1, characterized in that: Filter nets (8) are arranged at intervals inside the filter pool (5), and biochar is filled between the filter nets (8) to enhance the filtering effect.

4. A system for controlling and purifying carbon and nitrogen losses in fermented biogas slurry from livestock manure according to claim 3, characterized in that: A synchronization plate (9) is fixed between the filter screens (8) and near the edge ends, a slide rail (11) is vertically provided on the inner wall of the filter pool (5), a slider (10) is fixedly connected to the outer side of the synchronization plate (9), and the slider (10) is slidably connected to the slide rail (11).

5. The system for controlling and purifying carbon and nitrogen losses in fermented biogas slurry from livestock manure according to claim 1, characterized in that: The discharge pipe (6) is connected to a valve (7), a support assembly (17) for increasing the height is fixed to the bottom of the filter tank (5), and the biogas slurry in the black film fermentation biogas tank (1) is delivered into the filter tank (5) by a water pump.

6. The system for controlling and purifying carbon and nitrogen losses in fermented biogas slurry from livestock manure according to claim 1, characterized in that: A stirring assembly (13) is rotatably connected in the sedimentation tank (12), and the stirring assembly (13) comprises a stirring shaft (131), a stirring rod (132), a stirring plate (133) and a stirring motor (134). The stirring shaft (131) is rotatably connected to the inner side walls at both ends of the sedimentation tank (12), one end of the stirring shaft (131) passes through the side wall of the sedimentation tank and is transmission-connected to the output shaft of the stirring motor on the outside, the stirring motor (134) is fixed to the outside of the sedimentation tank (12) through a bracket (16), the stirring rod (132) comprises a plurality of groups and is fixed on the outer side wall of the stirring shaft (131) in parallel and at intervals, and the stirring plate (133) is arranged in parallel with the stirring shaft (131) and is fixed to the plurality of groups of stirring rods (132).

7. The system for controlling and purifying carbon and nitrogen losses in fermented biogas slurry from livestock manure according to claim 1, characterized in that: A metering pump (15) is connected to the pipeline between the precipitant storage tank (14) and the sedimentation tank (12).

8. The system for controlling and purifying carbon and nitrogen losses in fermented biogas slurry from livestock manure according to claim 1, characterized in that: The purified biogas slurry (3) on the black film covering layer (2) is used for returning to the field for fertilization or for aquaculture treatment.

Images