Anaerobic biogas digester for relieving ammonia nitrogen inhibition by adding trace elements
By adding trace elements such as iron and cobalt, combined with stirring and control devices, the problem of ammonia nitrogen inhibition in anaerobic digestion was solved, achieving stable and efficient operation of the biogas digester and efficient collection and utilization of biogas.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-03-24
AI Technical Summary
Increased ammonia nitrogen concentration during anaerobic digestion leads to system acidification, severely inhibiting anaerobic digestion and reducing biogas production rate, which is difficult to alleviate effectively with existing technologies.
By adding trace elements such as iron and cobalt, and using a mixer to reduce the ammonia nitrogen concentration in the biogas slurry, the mixing and feeding are controlled. Combined with gas collection, monitoring and heating devices, stable operation of anaerobic fermentation is achieved.
This reduces ammonia nitrogen concentration, alleviates acidification, increases pH value, and enables the continuous, stable, and efficient operation of the anaerobic fermentation system for livestock and poultry manure, as well as the efficient collection and aeration of biogas for returning to the fields.
Smart Images
Figure CN224030847U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of clean energy, and in particular to an anaerobic biogas digester that alleviates ammonia nitrogen inhibition by adding trace elements. Background Technology
[0002] Currently, anaerobic digestion for biogas production is an important way to utilize agricultural waste for resource and energy purposes. However, chicken manure, due to its high nitrogen content, will be converted into ammonia nitrogen during anaerobic digestion, leading to an increase in the ammonia nitrogen concentration in the system. At the same time, the system becomes acidified, which severely inhibits anaerobic digestion and reduces system performance. This is the key problem of low efficiency in anaerobic digestion.
[0003] Studies have shown that the addition of trace elements can enhance the activity of methanogenic bacteria, accelerate the conversion of volatile fatty acids into methane, mitigate acid inhibition, and counteract the toxic effects of high ammonia nitrogen, thus enabling anaerobic fermentation to proceed smoothly and effectively, thereby increasing biogas production. Therefore, the addition of trace elements has become an economical and practical industrial method for alleviating ammonia nitrogen inhibition.
[0004] Therefore, there is an urgent need to develop an anaerobic biogas digester that can alleviate ammonia nitrogen inhibition by adding trace elements. Utility Model Content
[0005] This invention addresses the shortcomings of existing technologies by providing an anaerobic biogas digester that alleviates ammonia nitrogen inhibition by introducing trace elements.
[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:
[0007] An anaerobic biogas digester for alleviating ammonia nitrogen inhibition by introducing trace elements includes a biogas digester body, which is equipped with a feeding device and a control device. The feeding device includes a feeding pipe, a pipe cover, an electronic scale, and a movable rod. The pipe cover is placed on the feeding pipe, the electronic scale is located inside the feeding pipe, and the movable rod is connected to both the feeding pipe and the electronic scale. The feeding pipe is inserted below the liquid surface to create an anaerobic environment, and the feeding pipe is divided into a material feeding pipe and a trace element feeding pipe. The control device includes a movable rod adjustment switch, which controls the movement of the movable rod to achieve the feeding of materials or trace elements. A mixer is installed inside the biogas digester body, and the control device can control the operation of the mixer to achieve the mixing of materials or trace elements.
[0008] The beneficial effects of adopting the above technical solution are that by mixing the biogas slurry with trace elements, the ammonia nitrogen concentration in the biogas slurry is reduced, the acidification phenomenon during the fermentation process is alleviated, the pH value of the biogas slurry is increased, and ultimately the anaerobic fermentation system for livestock and poultry manure can be operated continuously, stably and efficiently.
[0009] Based on the above technical solution, in order to achieve ease of use and stability of the equipment, the present invention can further improve the above technical solution as follows:
[0010] Furthermore, it also includes a gas collection device, which includes a gas flow meter and a biogas storage bag. The gas flow meter is connected to the biogas digester body and is used to monitor the total gas flow. The biogas storage bag is connected to the outside of the gas flow meter and is used to collect the generated biogas.
[0011] The beneficial effects of adopting the above technical solution are that the total gas flow rate can be monitored through a gas flow meter, and the generated biogas can be collected through a biogas storage bag.
[0012] Furthermore, it also includes a discharge device, which includes a discharge port, a discharge pipe, a liquid flow meter, and a peristaltic pump. The discharge port is located at the connection between the discharge pipe and the biogas digester body. The liquid flow meter and the peristaltic pump are both connected to the discharge pipe. The liquid flow meter is used to monitor the liquid flow rate.
[0013] The beneficial effect of adopting the above technical solution is that the liquid flow rate is monitored by a liquid flow meter, and the mixed liquid is discharged quantitatively by a peristaltic pump.
[0014] Furthermore, it also includes an aeration tank, which is located at the end of the discharge pipe away from the biogas digester body. The aeration tank is used to aerate the fermentation liquid to achieve the standard for returning it to the field.
[0015] The beneficial effect of adopting the above technical solution is that the mixed liquid is quantitatively discharged into the aeration tank by a peristaltic pump, and the fermented material is stored and aerated in the aeration tank.
[0016] Furthermore, it also includes a monitoring device for monitoring various indicators inside the reaction system; the monitoring device includes a pH meter and a thermometer, both of which are located inside the biogas digester body.
[0017] The beneficial effect of adopting the above technical solution is that various indicators inside the reaction system can be monitored by monitoring devices, such as monitoring the pH inside the reaction system by a pH meter and monitoring the temperature inside the reaction system by a thermometer.
[0018] Furthermore, it also includes a heating device located inside the biogas digester body, used to heat the fermentation liquid to a set temperature.
[0019] Furthermore, the control device also includes a display panel, which is electrically connected to the electronic scale via wiring.
[0020] The beneficial effect of adopting the above technical solution is that the weighing weight of the electronic scale can be viewed through the display panel.
[0021] Furthermore, the biogas digester body includes a top cover, which is located at the top of the biogas digester body. The feed pipe passes through the top cover and extends into the interior of the biogas digester body. Anaerobic sealant is provided in the gap between the feed pipe and the top cover.
[0022] The advantage of adopting the above technical solution is that it ensures that the reaction is carried out in an anaerobic environment.
[0023] Furthermore, the biogas digester body also includes an impermeable membrane, which is disposed on the outer wall of the biogas digester body.
[0024] Furthermore, the trace element feed tube is provided in multiple parts, each used for feeding different trace elements.
[0025] The beneficial effects of adopting the above technical solution are that, among various trace elements, the effect of iron supplementation on anaerobic digestion has been studied most extensively; cobalt, in addition to promoting methane formation, can also promote acetylation in anaerobic digestion, and its applications are also quite wide; another trace element can be selected according to the fermentation substrate. Simultaneous addition of multiple trace elements has a better promoting and stress-resistant effect on anaerobic digestion. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0027] Explanation of reference numerals in the attached drawings: 1. Biogas digester body; 1-1. Mixer; 1-2. Scale line; 1-3. Impermeable membrane; 1-4. Top cover; 2. Control device; 2-1. Adjustable lever switch; 2-2. Water temperature control system; 2-3. Peristaltic pump adjustment switch; 2-4. Display panel; 2-5. Main switch; 2-6. Voltmeter; 3. Feeding device; 3-1. Trace element feed pipe; 3-2. Material feed pipe; 3-3. Pipe cover; 3-4. Electronic scale; 3-5. Adjustable lever; 3-6. Fixing device; 4. Discharge device; 4-1. Discharge port; 4-2. Discharge pipe; 4-3. Liquid flow meter; 4-4. Peristaltic pump; 5. Gas collection device; 5-1. Gas flow meter; 5-2. Biogas storage bag; 6. Monitoring device; 6-1. pH meter; 6-2. Thermometer; 7. Heating device; 8. Aeration tank. Detailed Implementation
[0028] The following is in conjunction with the appendix Figure 1 The principles and features of this utility model are described, and the examples given are only used to explain this utility model and are not intended to limit the scope of this utility model.
[0029] This utility model discloses an anaerobic biogas digester that alleviates ammonia nitrogen inhibition by adding trace elements.
[0030] Reference Figure 1 An anaerobic biogas digester for mitigating ammonia nitrogen inhibition by introducing trace elements includes a digester body 1, which is used for anaerobic fermentation to produce biogas. The digester body 1 is equipped with a feeding device 3 and a control device 2. The feeding device 3 is used to transport trace elements and fermentation materials to the digester body 1, and the control device 2 is used to set parameters and control the operation of the entire device. The anaerobic biogas digester also includes a discharge device 4, a gas collection device 5, a monitoring device 6, a heating device 7, and an aeration tank 8. The discharge device 4 is used to quantitatively discharge the mixed liquid into the aeration tank 8. The gas collection device 5 is used to collect the generated biogas. The monitoring device 6 is used to monitor various indicators within the reaction system. The heating device 7 is used to heat the fermentation liquid to a set temperature. The aeration tank 8 is used to aerate the discharged fermentation liquid to meet the standards for returning it to the field.
[0031] The biogas digester body 1 is constructed underground, with dimensions of 5m in length, 2m in width, and 3m in height, and an effective fermentation volume of 20m³. The biogas digester body 1 includes a waterproof membrane 1-3 located on its outer wall. The biogas digester body 1 is equipped with graduation lines 1-2, which are coated with waterproof paint on the inner walls of the digester body 1 to assist observers in determining the water level. The biogas digester body 1 also includes a top cover 1-4, which can be made of metal and is located on top of the biogas digester body 1.
[0032] The feeding device 3 includes a feeding pipe, a pipe cover 3-3, an electronic scale 3-4, a movable rod 3-5, and a fixing device 3-6. The feeding pipe passes through the top cover 1-4 and extends into the interior of the biogas digester body 1, immersing itself below the liquid surface to create an anaerobic environment. Furthermore, the gap between the feeding pipe and the top cover 1-4 is sealed using an anaerobic sealant such as synthetic resin to ensure the reaction takes place in an anaerobic environment.
[0033] The feed pipe is made of stainless steel, and its orifice diameter can be increased to 40mm to prevent solid blockage and reduce unclogging costs. The feed pipe is divided into a material feed pipe 3-2 and a trace element feed pipe 3-1, used for feeding biogas slurry and trace elements respectively. Three trace element feed pipes 3-1 are provided, each for feeding different trace elements. Among various trace elements, the effect of iron supplementation on anaerobic digestion has been the most extensively studied; cobalt, in addition to promoting methane formation, can also promote acetylation in anaerobic digestion and has a wide range of applications; another trace element can be selected based on the fermentation substrate. Simultaneous addition of multiple trace elements has a better promoting and stress-resistant effect on anaerobic digestion.
[0034] The pipe cover 3-3 is installed on the feed pipe, and the electronic scale 3-4 is located inside the feed pipe. The movable rod 3-5 is connected to both the feed pipe and the electronic scale 3-4. The control device 2 includes a movable rod adjustment switch 2-1, which controls the movement of the movable rod 3-5 to achieve the feeding of materials or trace elements. The control device 2 also includes a display panel 2-4, which is an LCD screen. The display panel 2-4 is electrically connected to the electronic scale 3-4 via wiring, allowing the user to view the weighing weight of the electronic scale 3-4 through the display panel 2-4.
[0035] Multiple fixing devices 3-6 are provided, and each fixing device 3-6 is simultaneously connected to the feed pipe and the top cover 1-4 to fix the feed pipe.
[0036] The biogas digester body 1 is equipped with a mixer 1-1, and the control device 2 can control the operation of the mixer 1-1 to achieve the mixing of materials or trace elements.
[0037] The heating device 7 is located inside the biogas digester body 1 and is used to heat the fermentation liquid to a set temperature. The control device 2 also includes a water temperature adjustment switch, which is used to set the temperature of the biogas digester body 1 between 30-40℃. Generally, under medium temperature conditions, the methane fermentation gas production rate of livestock and poultry manure is higher.
[0038] The monitoring device 6 includes a pH meter 6-1 and a thermometer 6-2. Both the pH meter 6-1 and the thermometer 6-2 are located inside the biogas digester body 1. The pH inside the reaction system can be monitored by the pH meter 6-1, and the temperature inside the reaction system can be monitored by the thermometer 6-2.
[0039] The gas collection device 5 includes a gas flow meter 5-1 and a biogas storage bag 5-2. The gas flow meter 5-1 is connected to the top cover 1-4 of the biogas digester body 1 and is used to monitor the total gas flow rate. The biogas storage bag 5-2 is connected to the outside of the gas flow meter 5-1 and is made of PVC material to collect the generated biogas. The outside of the biogas storage bag 5-2 can be covered with a cloth bag or canvas bag for protection to prevent sun exposure and scratches from sharp objects.
[0040] The discharge device 4 includes a discharge port 4-1, a discharge pipe 4-2, a liquid flow meter 4-3, and a peristaltic pump 4-4. The discharge pipe 4-2 is made of stainless steel, and the connection between the discharge pipe 4-2 and the biogas digester body 1 is the discharge port 4-1. The liquid flow meter 4-3 and the peristaltic pump 4-4 are both connected to the discharge pipe 4-2. The liquid flow meter 4-3 is an intelligent electromagnetic flow meter used to monitor the liquid flow rate. The peristaltic pump 4-4 is a high-flow electric peristaltic pump 4-4. The aeration tank 8 is located at the end of the discharge pipe 4-2 away from the biogas digester body 1. The control device 2 also includes a peristaltic pump regulating switch 2-3, used to control the peristaltic pump 4-4 to quantitatively discharge the mixed liquid into the aeration tank 8.
[0041] The aeration tank 8 is built underground and is used to store the fermented material and aerate it.
[0042] The control device 2 also includes a main switch 2-5 and a voltmeter 2-6. The main switch 2-5 can control the entire anaerobic biogas digester, and the voltmeter 2-6 can control the pressure inside the biogas digester body 1.
[0043] The implementation principle of this utility model embodiment of an anaerobic biogas digester that alleviates ammonia nitrogen inhibition by adding trace elements is as follows: Based on the degree of ammonia nitrogen inhibition within the anaerobic reaction system, different trace elements, such as iron and cobalt, are added through multiple independent trace element feed pipes 3-1. The amount of each element added can be independently adjusted according to the needs of the fermentation process. Each trace element feed pipe 3-1 is equipped with an electronic scale 3-4 to ensure accurate and controllable addition of trace elements. A mixer 1-1 mixes the biogas slurry with the trace elements to reduce the ammonia nitrogen concentration in the biogas slurry, alleviate acidification during fermentation, and increase the pH value of the biogas slurry, ultimately achieving continuous, stable, and efficient operation of the livestock and poultry manure anaerobic fermentation system. Simultaneously, the anaerobic biogas digester can achieve quantitative feeding and discharging according to project needs, and the discharged material can be aerated and returned to the field, realizing the secondary use of the biogas slurry.
[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An anaerobic biogas digester that alleviates ammonia nitrogen inhibition by adding trace elements, characterized in that: The digester includes a biogas digester body (1), which is equipped with a feeding device (3) and a control device (2). The feeding device (3) includes a feeding pipe, a pipe cover (3-3), an electronic scale (3-4), and a movable rod (3-5). The pipe cover (3-3) is placed on the feeding pipe, the electronic scale (3-4) is located inside the feeding pipe, and the movable rod (3-5) is connected to both the feeding pipe and the electronic scale (3-4). The feeding pipe is inserted below the liquid surface to form a liquid. In an anaerobic environment, the feed pipe is divided into a material feed pipe (3-2) and a trace element feed pipe (3-1); the control device (2) includes a movable rod adjustment switch (2-1), which is used to control the operation of the movable rod (3-5) to realize the feeding of materials or trace elements; the biogas digester body (1) is equipped with a mixer (1-1), and the control device (2) can control the operation of the mixer (1-1) to realize the mixing of materials or trace elements.
2. An anaerobic biogas digester for alleviating ammonia nitrogen inhibition by adding trace elements according to claim 1, characterized in that: It also includes a gas collection device (5), which includes a gas flow meter (5-1) and a biogas storage bag (5-2). The gas flow meter (5-1) is connected to the biogas digester body (1) and is used to monitor the total gas flow. The biogas storage bag (5-2) is connected to the outside of the gas flow meter (5-1) and is used to collect the generated biogas.
3. An anaerobic biogas digester for alleviating ammonia nitrogen inhibition by adding trace elements according to claim 1, characterized in that: It also includes a discharge device (4), which includes a discharge port (4-1), a discharge pipe (4-2), a liquid flow meter (4-3), and a peristaltic pump (4-4). The discharge pipe (4-2) is connected to the biogas digester body (1) at the discharge port (4-1). The liquid flow meter (4-3) and the peristaltic pump (4-4) are both connected to the discharge pipe (4-2). The liquid flow meter (4-3) is used to monitor the liquid flow rate.
4. An anaerobic biogas digester for alleviating ammonia nitrogen inhibition by adding trace elements according to claim 3, characterized in that: It also includes an aeration tank (8), which is located at one end of the discharge pipe (4-2) away from the biogas digester body (1). The aeration tank (8) is used to aerate the fermentation liquid to achieve the standard of returning it to the field.
5. An anaerobic biogas digester for alleviating ammonia nitrogen inhibition by adding trace elements according to claim 1, characterized in that: It also includes a monitoring device (6), which is used to monitor various indicators inside the reaction system; the monitoring device (6) includes a pH meter (6-1) and a thermometer (6-2), both of which are located inside the biogas digester body (1).
6. An anaerobic biogas digester for alleviating ammonia nitrogen inhibition by adding trace elements according to claim 1, characterized in that: It also includes a heating device (7), which is located inside the biogas digester body (1) and is used to heat the fermentation liquid to a set temperature.
7. An anaerobic biogas digester for alleviating ammonia nitrogen inhibition by adding trace elements according to claim 1, characterized in that: The control device (2) also includes a display panel (2-4), which is electrically connected to the electronic scale (3-4) via a line.
8. An anaerobic biogas digester for alleviating ammonia nitrogen inhibition by adding trace elements according to claim 1, characterized in that: The biogas digester body (1) includes a top cover (1-4), which is located at the top of the biogas digester body (1). The feed pipe passes through the top cover (1-4) and extends into the interior of the biogas digester body (1). Anaerobic sealant is provided in the gap between the feed pipe and the top cover (1-4).
9. An anaerobic biogas digester for alleviating ammonia nitrogen inhibition by adding trace elements according to claim 8, characterized in that: The biogas digester body (1) also includes an impermeable membrane (1-3), which is disposed on the outer wall of the biogas digester body (1).
10. An anaerobic biogas digester for alleviating ammonia nitrogen inhibition by adding trace elements according to claim 1, characterized in that: The trace element feed pipe (3-1) is provided in multiple parts, each used for feeding different trace elements.