Comprehensive biological enhancement process for producing biogas through anaerobic fermentation

Abstract

The invention discloses a comprehensive biological enhancement process for biogas production through anaerobic fermentation, which relates to the technical field of biogas fermentation, comprises a culture unit of dominant flora, a nutrient solution storage unit and a flora activity online monitoring system, and is suitable for various technologies for biogas production through wet anaerobic fermentation. According to different fermentation raw materials, an extra flora optimization tank is matched with a flora culture tank to autonomously culture targeted dominant flora, the flora activity is accurately judged by monitoring multiple parameters such as pH value, temperature, pressure, COD, oxidation-reduction potential, dissolved oxygen, biogas amount, methane concentration and the like of the system, and then the autonomously cultured flora is automatically added, so that the fermentation efficiency is improved. The gas production rate and the methane concentration are improved. The flora optimization tank and the flora culture tank which are matched for use provide targeted means for culturing various florae in the anaerobic fermentation process, operation management of an anaerobic fermentation biogas production system is optimized, stable improvement of the biogas yield and the methane concentration is achieved, and the economic benefits of a biogas project are improved.

Description

Technical Field

[0001] The invention relates to the technical field of biogas fermentation, in particular to a comprehensive bio-enhancement process for producing biogas through anaerobic fermentation. Background Art

[0002] With the decreasing fossil fuel resources, the increasingly serious environmental pollution problem and the need for low-carbon development to cope with climate change, the development and utilization of renewable energy has become particularly important. As a low-carbon, clean, renewable energy, biogas has attracted widespread attention due to its sustainability and environmental friendliness. The biogas project uses technical means to convert biomass resources such as organic waste into efficient and clean energy forms, ultimately achieving multiple economic and social benefits such as low carbon, energy, environmental protection, circular economy, rural revitalization, and ecology.

[0003] The biogas project uses organic waste such as livestock and poultry manure, crop straw, agricultural product processing waste, restaurant kitchen waste, river and lake aquatic plants and sludge, landscaping waste and energy crops as raw materials. Through anaerobic fermentation technology, the organic matter in the organic waste is converted into methane and carbon dioxide, and the methane is further purified to obtain low-carbon and clean renewable biogas, and organic fertilizer is produced as a by-product.

[0004] However, due to the complexity of the anaerobic fermentation process of producing biogas, most fermentation equipment is concentrated in a single fermentation container to directly carry out fermentation treatment, lacking sufficient monitoring means. There is also a biogas anaerobic fermentation status monitoring system such as CN116769581A, which includes a biogas anaerobic fermentation tank, a pH sensor, a biogas flow sensor, a diaphragm pump, a valve, an electronic nose detection control box and a control platform; the pH sensor, the biogas flow sensor and the electronic nose detection control box are respectively connected to the control platform; the valve is connected to the electronic nose detection control box; the pH sensor is installed on the side wall of the biogas anaerobic fermentation tank; the biogas flow sensor is installed on the biogas pipeline at the output end of the biogas anaerobic fermentation tank; the valve is installed on the biogas pipeline at the input end of the electronic nose detection control box; the diaphragm pump is installed on the biogas pipeline at the output end of the electronic nose detection control box; the valve is installed on the biogas pipeline at the output end of the diaphragm pump. To solve the problem of untimely biogas monitoring, which affects the safety and economy of biogas projects, but this type of equipment often lacks systematic optimization methods for different bacterial communities, which makes the anaerobic digestion process difficult to control, and there are generally problems such as incomplete fermentation and low gas production efficiency, which in turn leads to poor economic benefits of engineering projects and difficulty in achieving full commercial operation. In view of this, in-depth research was conducted on the above issues, resulting in this case. Summary of the invention

[0005] The object of the present invention is to provide an anaerobic fermentation integrated bio-augmentation process for producing biogas, so as to solve the problem that the above-mentioned background technology proposes direct fermentation treatment in a separate fermentation container, lacks systematic detection, lacks optimization means for different bacterial communities, thereby making the anaerobic digestion process difficult to control and affecting economic benefits.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an anaerobic fermentation biogas production integrated bio-enhancement process, comprising a culture unit of a dominant bacterial community, a nutrient solution storage unit and an online monitoring system for bacterial community activity, wherein the culture unit of the dominant bacterial community comprises a bacterial community optimization tank and a bacterial community culture tank, and the nutrient solution storage unit comprises a pH regulator unit, a first nutrient solution unit, a second nutrient solution unit, a third nutrient solution unit, a fourth nutrient solution unit and a fifth nutrient solution unit, and according to different fermentation raw materials, a targeted dominant bacterial community is autonomously cultivated through an additional bacterial community optimization tank, and its bacterial community activity is judged through a monitoring system, and then the autonomously cultivated bacterial community is automatically added, so as to accelerate the reaction process and increase the gas production and methane concentration under low-cost conditions;

[0007] The specific implementation methods of the process include:

[0008] Add organic waste or biogas residue / liquid to the microbial community optimization tank. According to the characteristics of the biogas project itself, control the temperature within the specified temperature range, add a pH regulator unit to adjust the pH value between 6 and 8, and accurately determine the amount of nutrient solution to be added to the first nutrient solution unit, the second nutrient solution unit, the third nutrient solution unit, the fourth nutrient solution unit, and the fifth nutrient solution unit by monitoring parameters such as temperature, pressure, C:N:P, conductivity, dissolved oxygen, turbidity, pH, methane concentration, and biogas flow, so as to optimize the reproduction of the original methanogens in the organic waste;

[0009] When the methanogens in the microbial community optimization tank reach the specified concentration, they will be sent to the microbial community culture tank. Through the ratio of different nutrient solutions, an environment suitable for the growth of various bacteria and flora in anaerobic fermentation will be created. Under this condition, various bacteria and flora will multiply rapidly.

[0010] The above operation is repeated continuously, and the duration of each cycle is shortened successively, so that the bacterial flora culture is finally completed smoothly and quickly.

[0011] Preferably, the process is applicable to various wet anaerobic fermentation biogas production technologies, including projects using reactors such as CSTR, USR, UASB, IC and EGSB.

[0012] Preferably, the monitoring system detects parameters including pH value, temperature, pressure, COD, redox potential, dissolved oxygen, biogas volume, methane concentration and other parameters.

[0013] Preferably, the high-concentration bacteria cultured in the bacteria culture tank is connected to the anaerobic fermentation reactor of the biogas project, and is added to the anaerobic fermentation reactor in a timely manner and in an appropriate amount according to the monitoring data of the anaerobic fermentation reactor to optimize and improve its operating conditions.

[0014] Compared with the prior art, the invention has the following beneficial effects: the comprehensive bio-enhancement process for producing biogas by anaerobic fermentation provides targeted means for cultivating various flora in the anaerobic fermentation process by coordinating the flora optimization tank and the flora culture tank, thereby creating an environment that is extremely suitable for the growth of various bacteria and flora in the anaerobic fermentation process, optimizing the operation and management of the anaerobic fermentation biogas production system, and various bacteria and flora will multiply rapidly, achieving a stable increase in biogas production and methane concentration, thereby improving the economic benefits of the biogas project. The specific technical advantages include:

[0015] 1. Reduce the hydraulic retention time of anaerobic fermentation;

[0016] 2. Improve the gas production rate of raw materials;

[0017] 3. Improve the methane concentration of biogas. Considering the methane concentration and gas production rate, the methane production can be increased by more than 20%;

[0018] 4. The system can realize fully automatic control operation without manual operation;

[0019] 5. Not dependent on external bacteria or flora. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the comprehensive system for producing biogas through anaerobic fermentation according to the present invention.

[0021] In the figure: 1. Bacteria optimization tank; 2. Bacteria culture tank; 3.1. PH regulator unit; 3.2. First nutrient solution unit; 3.3. Second nutrient solution unit; 3.4. Third nutrient solution unit; 3.5. Fourth nutrient solution unit; 3.6. Fifth nutrient solution unit. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1The present invention provides a technical solution: an integrated bio-augmentation process for producing biogas through anaerobic fermentation, including a culture unit for a dominant bacterial community, a nutrient solution storage unit, and an online monitoring system for bacterial community activity. The process is applicable to various wet anaerobic fermentation biogas production technologies, including projects using reactors such as CSTR, USR, UASB, IC, and EGSB. The culture unit for the dominant bacterial community includes a bacterial community optimization tank 1 and a bacterial community culture tank 2. The nutrient solution storage unit includes a pH regulator unit 3.1, a first nutrient solution unit 3.2, a second nutrient solution unit 3.3, a third nutrient solution unit 3.4, a fourth nutrient solution unit 3.5, and a fifth nutrient solution unit 3.6. Depending on the fermentation raw materials, a targeted dominant bacterial community is autonomously cultivated through an additional bacterial community optimization tank 1, and its bacterial community activity is determined through a monitoring system. The monitoring system detects parameters including pH value, temperature, pressure, COD, redox potential, dissolved oxygen, biogas volume, methane concentration, and other parameters, such as Figure 1 As shown in the figure, the data of parameters such as pressure P, oxygen content O2, biogas flow FR, methane content CH4, carbon dioxide content CO2, hydrogen sulfide content H2S, etc. are derived from the monitoring data of the biogas project, which are used to observe and reflect the operation status of bioaugmentation, and then automatically add the self-cultivated bacterial community to accelerate the reaction process and increase the gas production and methane concentration under low-cost conditions;

[0024] The specific implementation methods of the process include:

[0025] Add organic waste or biogas residue / liquid into the bacterial community optimization tank 1, control the temperature within the specified temperature range according to the characteristics of the biogas project itself, add the pH regulator unit 3.1 to adjust the pH value between 6 and 8, and accurately determine the amount of nutrient solution to be added to the first nutrient solution unit 3.2, the second nutrient solution unit 3.3, the third nutrient solution unit 3.4, the fourth nutrient solution unit 3.5 and the fifth nutrient solution unit 3.6 by monitoring parameters such as temperature, pressure, C:N:P, conductivity, dissolved oxygen, turbidity, pH, methane concentration, and biogas flow, so as to optimize the reproduction of the original methanogens in the organic waste.

[0026] When the methanogens in the flora optimization tank 1 reach the specified concentration, they will be sent to the flora culture tank 2. Through the ratio of different nutrient solutions, an environment suitable for the growth of various bacteria and flora in anaerobic fermentation will be created. Under this condition, various bacteria and flora will multiply rapidly.

[0027] The above operation is repeated continuously, and the duration of each cycle is shortened successively, so that the bacterial flora culture is finally completed smoothly and quickly.

[0028] The high-concentration bacteria cultured in the bacteria culture tank 2 is connected to the anaerobic fermentation reactor of the biogas project, and is added to the anaerobic fermentation reactor in a timely and appropriate amount according to the monitoring data of the anaerobic fermentation reactor to optimize and improve its operating conditions.

[0029] Contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. Although the embodiments of the present invention have been shown and described, it is understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A comprehensive bio-augmentation process for producing biogas by anaerobic fermentation, characterized in that: The invention comprises a culture unit for a dominant bacterial colony, a nutrient solution storage unit and an online monitoring system for bacterial colony activity. The culture unit for the dominant bacterial colony comprises a bacterial colony optimization tank (1) and a bacterial colony culture tank (2). The nutrient solution storage unit comprises a pH regulator unit (3.1), a first nutrient solution unit (3.2), a second nutrient solution unit (3.3), a third nutrient solution unit (3.4), a fourth nutrient solution unit (3.5) and a fifth nutrient solution unit (3.6). According to different fermentation raw materials, a targeted dominant bacterial colony is autonomously cultivated through an additional bacterial colony optimization tank (1), and its bacterial colony activity is judged through a monitoring system, and then the autonomously cultivated bacterial colony is automatically added, so as to accelerate the reaction process and increase the gas production and methane concentration under low-cost conditions. The specific implementation methods of the process include: Adding organic waste or biogas residue / liquid to a bacterial community optimization tank (1), controlling the temperature within a specified temperature range according to the characteristics of the biogas project itself, adding a pH regulator unit (3.1) to adjust the pH value between 6 and 8, and accurately determining the amount of nutrient solution to be added to the first nutrient solution unit (3.2), the second nutrient solution unit (3.3), the third nutrient solution unit (3.4), the fourth nutrient solution unit (3.5) and the fifth nutrient solution unit (3.6) by monitoring parameters such as temperature, pressure, C:N:P, conductivity, dissolved oxygen, turbidity, pH, methane concentration, and biogas flow, thereby optimizing the reproduction of the original methanogens in the organic waste; When the methanogens in the bacterial community optimization tank (1) reach a specified concentration, they will be sent to the bacterial community culture tank (2). Through the ratio of different nutrient solutions, an environment suitable for the growth of various bacteria and bacterial communities in anaerobic fermentation will be created. Under this condition, various bacteria and bacterial communities will multiply rapidly. The above operation is repeated continuously, and the duration of each cycle is shortened successively, so that the bacterial flora culture is finally completed smoothly and quickly.

2. The comprehensive bio-augmentation process for producing biogas by anaerobic fermentation according to claim 1, characterized in that: The process is applicable to various wet anaerobic fermentation biogas production technologies, including projects using reactors such as CSTR, USR, UASB, IC and EGSB.

3. The comprehensive bio-augmentation process for producing biogas by anaerobic fermentation according to claim 1, characterized in that: The monitoring system detects parameters including pH value, temperature, pressure, COD, redox potential, dissolved oxygen, biogas volume, and methane concentration.

4. The comprehensive bio-augmentation process for producing biogas by anaerobic fermentation according to claim 1, characterized in that: The high-concentration bacterial flora cultured in the bacterial flora culture tank (2) is connected to the anaerobic fermentation reactor of the biogas project, and is added to the anaerobic fermentation reactor in a timely and appropriate amount according to the monitoring data of the anaerobic fermentation reactor, so as to optimize and improve its operating conditions.

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