Sequential bacteria-algae coupling biogas slurry treatment device

Abstract

The utility model discloses a sequential bacteria-algae coupling biogas slurry treatment device, and belongs to the technical field of biogas slurry treatment. The device comprises a biogas slurry tank, a pretreatment tank, an aerobic tank and a disinfection tank which are sequentially arranged, an interlayer I is arranged between the biogas slurry tank and the pretreatment tank, an interlayer II is arranged between the pretreatment tank and the aerobic tank, an interlayer III is arranged between the aerobic tank and the disinfection tank, and a water outlet I is formed in the bottom of the disinfection tank; the first water outlet is kept in an open state, biogas slurry in the biogas slurry tank permeates into the pretreatment tank through the first interlayer, permeates into the aerobic tank through the second interlayer, permeates into the disinfection tank through the third interlayer and flows out of the first water outlet, and the biogas slurry is used for culturing functional microalgae after being treated. The biogas slurry treatment device is ingenious in structural arrangement and simple in treatment process, and can effectively realize biogas slurry treatment by arranging the treatment ponds with different functions.

Description

Technical Field

[0001] This utility model relates to the field of biogas slurry treatment technology, and in particular to a sequential microbial-algae coupled biogas slurry treatment device that utilizes synthetic microbial communities and functional microalgae. Background Technology

[0002] In recent years, with the continuous and stable growth of the livestock and poultry farming industry, the rapid development of this industry is inseparable from the increased intensification and the use of various feed additives. However, the biogas slurry produced during the farming process contains a large number of harmful substances, such as excessive nitrogen and phosphorus nutrients. If these substances are not properly treated, they will cause eutrophication of surrounding natural waters, seriously affecting the ecological environment. Therefore, various regions have successively issued "Pollutant Discharge Standards for Livestock and Poultry Farming," setting specific standards for the content of suspended solids, pH value, salinity, total nitrogen, and total phosphorus in biogas slurry. However, existing biogas slurry treatment technologies mainly remove some organic matter, ammonia nitrogen, and nitrite through biochemical methods, but these methods cannot fully meet the requirements of the discharge standards. The resource utilization of biogas slurry not only contributes to environmental protection and ecological balance, promoting the green development of the farming industry, but also reduces water waste and achieves water resource recycling, meeting the requirements of sustainable development. Therefore, the development of a multi-stage, high-efficiency biogas slurry resource utilization equipment is particularly urgent. Utility Model Content

[0003] The purpose of this invention is to propose a sequential bacteria-algae coupled biogas slurry treatment device to overcome the shortcomings of existing technologies.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A sequential algae-bacterial coupled biogas slurry treatment device includes a biogas slurry tank, a pretreatment tank, an aerobic tank, and a disinfection tank arranged sequentially. A first partition is provided between the biogas slurry tank and the pretreatment tank; a second partition is provided between the pretreatment tank and the aerobic tank; and a third partition is provided between the aerobic tank and the disinfection tank. An outlet is located at the bottom of the disinfection tank. With outlet one open, the biogas slurry from the biogas slurry tank permeates through the first partition into the pretreatment tank, through the second partition into the aerobic tank, and then through the third partition into the disinfection tank, finally flowing out through outlet one, thus completing the biogas slurry treatment.

[0006] Furthermore, the first, second, and third partitions have the same structure, with mesh on both sides of each partition. The partitions are filled with volcanic rock filler, which is used to intercept and adsorb suspended solids, microorganisms, and organic matter in the water, increase the surface area of ​​the water body, improve the contact between the water body and the air, thereby increasing the dissolved oxygen content in the water, which is conducive to the growth of aerobic microorganisms and the degradation of pollutants.

[0007] Furthermore, the pretreatment pool is equipped with brushes, preferably filled with nylon brushes.

[0008] Furthermore, an aeration device is provided at the bottom of the aerobic tank.

[0009] Furthermore, a stirring device is provided at the bottom of the disinfection pool.

[0010] Furthermore, the device also includes a microalgae cultivation tank, and the outlet is located above the microalgae cultivation tank.

[0011] Furthermore, the microalgae cultivation tank is equipped with an external light source to provide illumination for the cultivation of functional microalgae; an aeration device is provided at the bottom inner side of the microalgae cultivation tank to provide air for the cultivation of functional microalgae and continuously agitate the water; and an outlet is provided on the outer side of the bottom of the microalgae cultivation tank to discharge the cultivated functional microalgae.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0013] This invention features a cleverly designed structure and a simple processing procedure. By setting up treatment tanks with different functions, it can effectively treat biogas slurry. The device utilizes biogas slurry filtration, microbial degradation, disinfection, and microalgae cultivation to remove nitrogen, phosphorus, organic pollutants, and suspended particles from the biogas slurry, while simultaneously promoting microalgae growth. The device boasts excellent effluent quality, low energy consumption, and a simple operating procedure, and can effectively alleviate eutrophication problems in water bodies, thereby achieving the effective resource utilization of biogas slurry. This invention realizes the resource utilization of biogas slurry through processes such as filtration and adsorption, microbial action, disinfection, and microalgae cultivation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the microalgae culture tank structure of this utility model.

[0016] Figure 3 This is a schematic diagram of the novel partition structure used in this experiment.

[0017] Among them, 1-biogas slurry tank, 2-partition one, 3-pretreatment tank, 4-partition two, 5-aerobic tank, 6-partition three, 7-disinfection tank, 8-microalgae cultivation tank, 9-grid, 10-brush, 11-aeration device, 12-stirring device, 13-outlet one, 14-external light source, 15-outlet two, 16-volcanic rock filler. Detailed Implementation

[0018] The present invention will be further explained and described below through specific embodiments and in conjunction with the accompanying drawings.

[0019] Example 1:

[0020] A sequential bacteria-algae coupled biogas slurry treatment device, such as Figure 1 As shown, the device includes a biogas slurry tank 1, a pretreatment tank 3, an aerobic tank 5, a disinfection tank 7, and a microalgae cultivation tank 8 arranged sequentially. A partition 2 is provided between the biogas slurry tank 1 and the pretreatment tank 3; a partition 4 is provided between the pretreatment tank 3 and the aerobic tank 5; and a partition 6 is provided between the aerobic tank 5 and the disinfection tank 7. An outlet 13 is located at the bottom of the disinfection tank 7, positioned above the microalgae cultivation tank 8. With the outlet 13 open, the biogas slurry from the biogas slurry tank 1 permeates through partition 2 into the pretreatment tank 3, through partition 4 into the aerobic tank 5, and through partition 6 into the disinfection tank 7, before flowing into the microalgae cultivation tank 8 through the outlet 13.

[0021] In one embodiment, such as Figure 3 As shown, the first partition 2, the second partition 4 and the third partition 6 have the same structure. Both sides of the partition are provided with grids 9, and the partition is filled with volcanic rock filler 16.

[0022] In one embodiment, the pretreatment pool 3 is equipped with a brush 10.

[0023] In one embodiment, an aeration device 11 is provided at the bottom of the aerobic tank 5.

[0024] In one embodiment, a stirring device 12 is provided at the bottom of the disinfection pool 7.

[0025] In one embodiment, such as Figure 2 As shown, the microalgae cultivation tank 8 is equipped with an external light source 14, an aeration device 11 is provided on the inner bottom of the microalgae cultivation tank 8, and an outlet 15 is provided on the outer side of the bottom of the microalgae cultivation tank 8.

[0026] In one embodiment, a water pump is used to pump the aquaculture biogas slurry into the biogas slurry tank through pipelines, maintaining a stable flow rate. The biogas slurry, filtered from the biogas slurry tank and pretreatment tank, flows into an aerobic tank containing a synthetic microbial community. It then flows into a disinfection tank, where it is disinfected with hydrogen peroxide, and finally into a microalgae cultivation tank for the cultivation of functional microalgae. The water pump is made of stainless steel, and the entire device is made of tempered glass. Using a stainless steel pump increases its strength and reduces the risk of rust from prolonged contact with water. The tempered glass construction is resistant to corrosion from the biogas slurry. This system effectively intercepts and adsorbs suspended solid particles in the water, including uneaten feed, feces, phytoplankton, microbial films, and flocculants.

[0027] In one embodiment, the pipes and fittings used in the biogas slurry treatment device are made of polyvinyl chloride (PVC). Using PVC to make pipes and fittings can improve their weather resistance and corrosion resistance, and add good electrical insulation, excellent heat resistance, adjustable hardness and flame suppression, thereby increasing the service life of the pipes and fittings.

[0028] In one embodiment, the aerobic tank contains a synthetic microbial community with specific functions, composed of Bacillus subtilis, Rhodococcus qingshengensis, Sphingomonas sphingosine monocytogenes, and Acinetobacter rumeni. This synthetic microbial community can efficiently degrade pollutants such as organic matter, nitrogen, and phosphorus in the water, thereby improving water quality.

[0029] In one embodiment, hydrogen peroxide is added to the disinfection tank to directly destroy the cell walls of bacteria, causing cell death, and leaving no harmful residues after use.

[0030] In one embodiment, the microalgae culture tank uses treated aquaculture slurry to cultivate functional microalgae, with strip light sources added around the tank to achieve resource utilization of the aquaculture slurry and form microalgae products.

[0031] Example 2:

[0032] This embodiment is based on the structural setup of Embodiment 1, and the device dimensions are shown in Table 1.

[0033] Diluted biogas slurry from actual livestock and poultry farming was used to fill the biogas slurry tank and the partition layer, maintaining a flow rate of 500 mL / h. The raw biogas slurry was temporarily stored in the biogas slurry tank and flowed into the pretreatment tank through volcanic rock filter media. In the pretreatment tank, the biogas slurry passed through the dense capillary structure, intercepting and adsorbing suspended solid particles in the water, including uneaten feed, feces, planktonic plants and animals, microbial films, and flocculants. After 24 hours, it flowed into the aerobic tank through the partition layer. At 30 hours, 10 mL of centrifuged resuspended particles for synthesizing microbial communities was added, replenished every 20 hours. After 48 hours, it flowed into the disinfection tank through the filter layer. At 58 hours, 10 mL of hydrogen peroxide was added, replenished every 20 hours. After 68 hours, it flowed into the microalgae cultivation tank. The nitrogen and phosphorus content of the effluent was tested at this time, and the nutrients required by Chlorella were supplemented and the pH was adjusted. The microalgae were harvested after 7 days. Samples were taken when the biogas slurry flowed out of each treatment tank and partition to measure ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, phosphate, COD, Vibrio, pH, dissolved oxygen and salinity.

[0034] Table 1. Description of the structural components, functions, and dimensions of the biogas slurry treatment device.

[0035]

[0036]

[0037] After passing through the device, the removal rate of various pollutants in the livestock and poultry biogas slurry is relatively high, with the removal effects of phosphate, total phosphorus, nitrate and salinity being particularly significant, indicating that the device provided by this utility model can effectively complete biogas slurry treatment.

[0038] Finally, although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sequential bacteria-algae coupling biogas slurry treatment device, characterized in that, The device comprises a biogas slurry pool (1), a pretreatment pool (3), an aerobic pool (5), and a disinfection pool (7) arranged in sequence; a partition one (2) is arranged between the biogas slurry pool (1) and the pretreatment pool (3), a partition two (4) is arranged between the pretreatment pool (3) and the aerobic pool (5), a partition three (6) is arranged between the aerobic pool (5) and the disinfection pool (7), and a water outlet one (13) is arranged at the bottom of the disinfection pool (7); the state of the water outlet one (13) is kept open, the biogas slurry in the biogas slurry pool (1) penetrates into the pretreatment pool (3) through the partition one (2), penetrates into the aerobic pool (5) through the partition two (4), and then penetrates into the disinfection pool (7) through the partition three (6), and finally flows out from the water outlet one (13), and the biogas slurry treatment is completed.

2. The sequential bacteria-algal coupled biogas liquid treatment device according to claim 1, wherein, The partition one (2), the partition two (4), and the partition three (6) are identical in structure, and the two sides of the partition are both provided with a grid (9), and the partition is filled with a volcanic rock filler (16).

3. The sequential bacteria-algal coupled biogas liquid treatment device according to claim 1, wherein, The pretreatment pool (3) is provided with a brush (10) inside.

4. The sequential macro-algal coupling biogas liquid treatment device according to claim 1, wherein, The bottom of the aerobic pool (5) is provided with an aeration device (11) inside.

5. The sequential macro-algal coupling biogas liquid treatment device according to claim 1, wherein, The bottom of the disinfection pool (7) is provided with a stirring device (12) inside.

6. The sequential macro-algal coupled biogas liquid treatment device of claim 1, wherein, The device further comprises a microalgae culture pool (8), and the water outlet one (13) is arranged above the microalgae culture pool (8).

7. The sequential macro-algal coupled biogas liquid treatment device according to claim 6, wherein, The microalgae culture pool (8) is provided with an external light source (14) above, the inner bottom of the microalgae culture pool (8) is provided with an aeration device (11), and the outer bottom of the microalgae culture pool (8) is provided with a water outlet two (15).

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