A device and process for synchronously removing hydrogen sulfide from biogas and fermentation liquid

Abstract

The present invention discloses a device and a process for synchronously removing hydrogen sulfide from biogas and fermentation liquid. In view of the fact that the prior art desulfurization requires the introduction of a large amount of air, which will affect anaerobic fermentation, the following technical scheme is provided: an anaerobic fermentation tank is connected to a biogas multi-component analyzer, a low-pressure gas mixing device, and a fermentation liquid ORP analyzer; biogas pipelines before desulfurization and biogas pipelines after desulfurization are respectively arranged at both ends of the anaerobic fermentation tank; a biogas flowmeter is arranged on the biogas pipeline before desulfurization to record the biogas flow rate; the other end of the biogas flowmeter is connected to a PID controller; the PID controller is connected to a variable frequency air blower; an air blower outlet arranged at the outer end of the variable frequency air blower is respectively connected to a low-pressure gas mixing device connecting pipeline and an anaerobic fermentation tank connecting pipeline; and the air volume of the variable frequency air blower is controlled by means of a PID controller. The present invention realizes synchronous removal of hydrogen sulfide in biogas and fermentation liquid, thereby reducing the content of hydrogen sulfide and increasing the biogas yield.

Description

Technical Field

[0001] The invention relates to the field of anaerobic fermentation of organic solid waste, and more specifically, to a device and a process for synchronously removing biogas and hydrogen sulfide from fermentation liquid. Background Art

[0002] Urban organic solid waste mainly refers to food waste. At present, the sludge from the fermentation liquid of food waste needs to be treated to meet the standards before being discharged into the municipal pipeline network. However, during the aerobic treatment of sewage, the high S2- concentration in the influent will lead to a decrease in COD removal rate, an increase in oxygen consumption, and an increase in the H2S concentration in the odor.

[0003] As the output of urban and agricultural and forestry organic solid waste increases year by year, it is necessary to realize the resource utilization of organic solid waste through anaerobic fermentation. Hydrogen sulfide will be produced in the anaerobic fermentation process. When the concentration of hydrogen sulfide in the fermentation liquid reaches a certain value, it will diffuse into the biogas. The hydrogen sulfide content in the biogas is generally 1000~8000ppm. Since the H2S contained in the biogas is a highly toxic gas, it is highly harmful. Human contact will cause poisoning or even death. At the same time, it will also cause damage to pipelines and related equipment. The SO2 generated during the combustion of H2S needs to be strictly monitored during the discharge into the atmosphere. Since H2S and its sulfides will cause various hazards, the biogas must be desulfurized before transportation and use.

[0004] H2S or sulfide present in the fermentation broth is poisonous to anaerobic methanogens. In the fermentation broth, H2S inactivates the cells by penetrating the cell walls of bacteria and destroying proteins. Sulfide reacts with metal ions to form metal sulfide precipitates, which reduces trace metal ions. Trace metal ions are important components of various reductases of microorganisms. The lack of trace metal ions will reduce the metabolic rate of microorganisms, thereby reducing the rate at which microorganisms degrade organic matter, resulting in a decrease in gas production.

[0005] Since H2S or sulfide in biogas and fermentation liquid cause many hazards, it is necessary to desulfurize biogas and fermentation liquid. The existing desulfurization technology only desulfurizes biogas, and has not yet achieved simultaneous desulfurization of biogas and fermentation liquid. In addition, the current main biogas desulfurization process is desulfurization outside the fermentation tank, including chemical desulfurization, biological desulfurization, and dry desulfurization. In this process, a large number of equipment are used, a large area is occupied, the investment is high, and the operating cost is high. Summary of the invention

[0006] In view of the deficiencies in the prior art, the object of the present invention is to provide a device and process for simultaneously removing hydrogen sulfide from biogas and fermentation liquid, which has the advantage of improving biogas production and quality while simultaneously removing hydrogen sulfide from biogas and fermentation liquid.

[0007] The above technical purpose of the present invention is achieved through the following technical solutions: a device for synchronously removing hydrogen sulfide from biogas and fermentation liquid, comprising an anaerobic fermentation tank, a biogas multi-component analyzer connected to the anaerobic fermentation tank, the biogas multi-component analyzer is connected to a biogas flowmeter, the other end of the biogas flowmeter is respectively connected to a low-pressure gas mixing device and a PID controller, the other end of the PID controller is connected to a variable frequency air fan and a fermentation liquid ORP analyzer, the fermentation liquid ORP analyzer and the low-pressure gas mixing device are respectively connected to the anaerobic fermentation tank.

[0008] Through the above technical scheme, the biogas and the fermentation liquid are firstly synchronously transported to the low-pressure gas mixing device, and the biogas and the fermentation liquid introduced into the low-pressure gas mixing device enter the anaerobic fermentation tank to process the components in the biogas and the fermentation liquid. The biogas multi-component analyzer is used to measure and count the gas components such as CH4, H2S, O2, CO2 contained in the components before entering the anaerobic fermentation tank, and the flow rate is counted by the biogas flowmeter. Then, the components after passing through the anaerobic fermentation tank are measured and counted by the fermentation liquid ORP analyzer for the desulfurized components. The data of the two measurements and statistics are compared to obtain the desulfurization data. The use of the biogas flowmeter, the fermentation liquid ORP analyzer and the biogas multi-component analyzer is controlled by using a PID controller. The fermentation liquid ORP analyzer can monitor the redox potential of the fermentation liquid in the anaerobic fermentation tank in real time. The PID controller monitors the real-time air flow of the variable frequency air fan to check the gas circulation. The anaerobic fermentation tank is used to synchronously process the hydrogen sulfide in the biogas and the fermentation liquid to improve the biogas production and quality.

[0009] The present invention is further configured as follows: a pre-desulfurization biogas pipeline and a post-desulfurization biogas pipeline are respectively arranged at both ends of the anaerobic fermentation tank, the biogas flowmeter and the low-pressure gas mixing device are respectively arranged on the pre-desulfurization biogas pipeline, the pre-desulfurization biogas pipeline is extended and connected with a pre-desulfurization biogas sampling pipeline, and the post-desulfurization biogas pipeline is extended and connected with a post-desulfurization biogas sampling pipeline; the pre-desulfurization biogas sampling pipeline and the post-desulfurization biogas sampling pipeline are connected to the biogas multi-component analyzer.

[0010] Through the above technical scheme, the biogas first enters the interior of the anaerobic fermentation tank through the pre-desulfurization biogas pipeline. In this process, the biogas and air in the pre-desulfurization biogas pipeline are quickly and evenly mixed in a controllable manner through a low-pressure gas mixing device. The biogas after the reaction in the anaerobic fermentation tank is then transported to the treated biogas through the post-desulfurization biogas pipeline connected to the anaerobic fermentation tank. At the same time, the pre-desulfurization biogas sampling pipeline and the post-desulfurization biogas sampling pipeline correspondingly connected to the pre-desulfurization biogas pipeline and the post-desulfurization biogas pipeline are used to sample the biogas, and then the samples are monitored and compared through a biogas multi-component analyzer.

[0011] The present invention is further configured as follows: an air fan outlet is extended from the outer end of the variable frequency air fan, and the air fan outlet is respectively connected to a low-pressure gas mixing device connecting pipeline and an anaerobic fermentation tank connecting pipeline; the low-pressure gas mixing device connecting pipeline is arranged at one end of the low-pressure gas mixing device, and the other end of the anaerobic fermentation tank connecting pipeline is connected to the anaerobic fermentation tank.

[0012] Through the above technical solution, air fan outlets are respectively arranged on both sides of the variable frequency air fan, which are connected to the anaerobic fermentation tank through the low-pressure gas mixing device connecting pipeline and the anaerobic fermentation tank connecting pipeline, so that the air flow passing through the connecting pipeline can be controlled by the variable frequency air fan.

[0013] The present invention is further configured as follows: an air flow meter and a flow control valve assembly a are arranged on the low-pressure gas mixing device connecting pipeline, and an air flow meter and a flow control valve assembly b are arranged on the anaerobic fermentation tank connecting pipeline.

[0014] Through the above technical solution, the air flow meter and flow control valve assembly a and the air flow meter and flow control valve assembly b are used to control the flow of biogas and air into the anaerobic fermentation tank, which is easy to use.

[0015] A process for simultaneously removing hydrogen sulfide from biogas and fermentation liquid, using a device for simultaneously removing hydrogen sulfide from biogas and fermentation liquid to implement the following process steps:

[0016] S1: First, the biogas and the gas in the fermentation liquid are input into the low-pressure gas mixing device;

[0017] S2: The gas mixed by the low-pressure gas mixing device is input into the interior of the anaerobic fermentation tank connected to the low-pressure gas mixing device, and the biogas and air are mixed quickly and evenly in the low-pressure gas mixing device in a controllable manner to avoid the mixed gas from being within the methane explosion hazard zone;

[0018] S3: The gas data introduced is sampled and counted through the pre-desulfurization biogas sampling pipeline set on the pre-desulfurization biogas pipeline connected to the anaerobic fermentation tank, and the pre-desulfurization data is stored and recorded through the biogas multi-component analyzer, and the component contents of CH4, H2S, O2, and CO2 passing through the pipeline are recorded;

[0019] S4: The instantaneous flow rate and cumulative flow rate of biogas entering the anaerobic fermentation tank are monitored in real time by a biogas flow meter installed on the biogas pipeline before desulfurization;

[0020] S5: A fermentation liquid ORP analyzer connected to the outside of the anaerobic fermentation tank is provided to monitor the redox potential of the fermentation liquid inside the anaerobic fermentation tank in real time;

[0021] S6: Control the use of biogas flow meter, fermentation liquid ORP analyzer and variable frequency air fan through PID controller;

[0022] S7: After being treated in the anaerobic fermentation tank, the biogas multi-component analyzer samples and counts the treated gas content and data through the post-desulfurization biogas pipeline and the post-desulfurization biogas sampling pipeline connected to both sides of the anaerobic fermentation tank;

[0023] S8: The biogas multi-component analyzer compares the data before sampling in step S3 with the data after sampling in step S7 to obtain the change of desulfurization data before and after sampling.

[0024] The present invention is further configured as follows: the PID controller controls the amount of air introduced into the biogas according to real-time data of the biogas flow meter and the biogas multi-component analyzer, and the flow rate is achieved by the air flow meter and the flow control valve component a.

[0025] Through the above technical solution, data are counted according to the biogas flow meter and the biogas multi-component analyzer, which facilitates the comparison and use of the statistical data.

[0026] The present invention is further configured as follows: the amount of air introduced into the fermentation liquid is controlled by the PID controller according to the data of the fermentation liquid ORP analyzer, and the flow rate is achieved by the air flow meter and the flow control valve component b.

[0027] Through the above technical solution, the PID controller used controls the data in the fermentation liquid ORP analyzer to regulate the air volume, and the circulating air volume is controlled by the air flow meter and the flow control valve component b to control the circulation or closing state.

[0028] The present invention is further configured as follows: the PID controller controls the operating load of the variable frequency air fan according to the air demand for biogas and fermentation liquid desulfurization to ensure the air supply.

[0029] Through the above technical solution, the air flow rate of the variable frequency air fan is controlled by a PID controller to meet the gas demand for biogas and fermentation liquid desulfurization.

[0030] The present invention is further configured such that the microbial reaction process in the fermentation liquid of the anaerobic fermentation tank adopts an intermittent micro-aeration method.

[0031] Through the above technical solution, the intermittent micro-aeration method can be intermittently operated in an orderly manner during the microbial reaction process to improve the desulfurization effect of the fermentation liquid. The operation is convenient, the time required is short, and the efficiency is high.

[0032] The present invention is further configured as follows: the biogas multi-component analyzer measures the biogas components in the channel, and the detection times range is 6-24 times or 12 times.

[0033] Through the above technical solution, the contents of CH4, H2S, O2 and CO2 in biogas are measured by a biogas multi-component analyzer, which is convenient for measuring the biogas components of one or more channels, and the detected data are statistically analyzed for comparison.

[0034] In summary, the present invention has the following beneficial effects:

[0035] 1. The present invention combines the desulfurization of biogas and fermentation liquid to achieve the purpose of synchronous removal. A low-pressure gas mixing device is used in the desulfurization process to ensure that biogas is quickly and evenly mixed with air or oxygen, and to avoid the mixed gas from being within the methane explosion hazard zone;

[0036] 2. The system adopts PID automatic control system, which does not require manual intervention, reduces labor intensity, improves desulfurization efficiency, and saves investment and operating costs;

[0037] 3. The present invention monitors the hydrogen sulfide content in biogas before and after desulfurization, the biogas flow rate, and the ORP of the fermentation liquid, and accurately controls the amount of air or oxygen introduced into the biogas and the fermentation liquid, so as to achieve the purpose of simultaneously removing hydrogen sulfide from the biogas and the fermentation liquid, thereby reducing the influence of H2S and its products on the activity of anaerobic microorganisms in the fermentation liquid, increasing the metabolic rate of microorganisms, improving the biogas production and quality, and reducing the problem of reduced COD removal rate caused by high S2- concentration in the biogas liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of an embodiment.

[0039] Figure numerals: 1. anaerobic fermentation tank; 2. biogas pipeline before desulfurization; 3. biogas pipeline after desulfurization; 4. low-pressure gas mixing device; 5. variable frequency air fan; 6. air fan outlet; 7. air flow meter and flow control valve assembly a; 8. anaerobic fermentation tank connecting pipeline; 9. air flow meter and flow control valve assembly b; 10. biogas flow meter; 11. biogas multi-component analyzer; 12. biogas sampling pipeline before desulfurization; 13. biogas sampling pipeline after desulfurization; 14. fermentation liquid ORP analyzer; 15. PID controller; 16. low-pressure gas mixing device connecting pipeline. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0041] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0042] Example:

[0043] A device for simultaneously removing hydrogen sulfide from biogas and fermentation liquid, see Figure 1 ,

[0044] During use, a mixed gas of biogas and fermentation liquid is input into the anaerobic fermentation tank 1 through the pre-desulfurization biogas pipeline 2, and a biogas flowmeter 10 and a low-pressure gas mixing device 4 are arranged on the pre-desulfurization biogas pipeline 2 to process the mixed gas passing through, wherein the biogas flowmeter 10 is used to monitor the instantaneous flow rate and cumulative flow rate of the biogas entering the anaerobic fermentation tank 1 in real time, and the low-pressure gas mixing device 4 achieves controllable rapid and uniform mixing of the mixed gas to prevent the mixed gas from being within the methane explosion hazard zone. At the same time, during use, the CH4, H2S, O2, and CO2 components in the biogas are measured by using a biogas multi-component analyzer 11, wherein the number of detections of the biogas multi-component analyzer 11 during use cannot be less than 6 times per day, and the maximum number of detections does not exceed 24 times. Specifically, the number of detections per day during use is 12 times, which can facilitate statistics and comparison of the data. The biogas flowmeter 10 and the biogas multi-component analyzer 11 are controlled by PID Under the action of the controller 15 and in combination with the air flow meter and the flow control valve component a7, the air flow introduced into the biogas is controlled. At the same time, the PID controller 15 also controls the amount of air introduced into the fermentation liquid according to the data recorded by the fermentation liquid ORP analyzer 14 in combination with the air flow meter and the flow control valve component b9. In addition, the PID controller 15 controls the operation of the variable frequency air fan 5 according to the air demand for biogas and fermentation liquid desulfurization to ensure that the air supply meets the gas demand for biogas and fermentation liquid desulfurization. Specifically, if the air volume needs to be adjusted during use, multiple air fans can be set to adjust the air volume and increase air circulation. At the same time, the variable frequency air fan 5 can be replaced by an oxygen generator or a pure oxygen supply equipment to achieve the same air supply effect.

[0045] Specifically, the H2S:O2 concentration ratio in the mixture of biogas and air or oxygen before desulfurization is in the range of 0.5-1, and when the H2S:O2 concentration ratio is 0.75, the hydrogen sulfide concentration at the biogas outlet is continuously and stably below 20ppm, and the O2 content in the biogas is less than 0.2%. The system is highly safe and will not limit the use of biogas due to the introduction of excessive O2.

[0046] At the same time, during the entire process, the ORP of the fermentation liquid is controlled within the range of -450mV~-350mV, and the best effect is achieved when the ORP is at -430mV, so that the fermentation liquid within the range of -450mV~-350mV can clearly show the quality of the water; within this numerical range, the sulfide concentration in the fermentation liquid decreases by 80%, and the concentration of trace elements necessary for anaerobic degradation such as Fe, Cr, and Mn increases by 60%.

[0047] After desulfurization, the concentration of H2S in the biogas pipeline is between 0-20ppm, and the concentration of O2 is between 0-0.2%. After desulfurization, the concentration of sulfide in the fermentation liquid will decrease by 70%-90%, and the concentration of trace elements necessary for anaerobic degradation such as Fe, Cr, and Mn in the fermentation liquid will increase by 20-60%; the concentrations of H2S and O2 after desulfurization are detected by a biogas multi-component analyzer 11; sulfide and metal ions are detected by professional institutions, and the sulfide concentration is detected by methylene blue spectrophotometry; the metal ion concentration is detected by inductively coupled plasma spectrometer / mass spectrometer (ICP-OES / ICP-MS).

[0048] A process for simultaneously removing hydrogen sulfide from biogas and fermentation liquid, the specific process operation steps are as follows:

[0049] S1: First, the biogas and the gas in the fermentation liquid are input into the low-pressure gas mixing device 4;

[0050] S2: The gas mixed by the low-pressure gas mixing device 4 is input into the interior of the anaerobic fermentation tank 1 connected to the low-pressure gas mixing device 4, and the biogas and air are mixed quickly and evenly in the low-pressure gas mixing device in a controllable manner to avoid the mixed gas being within the methane explosion hazard zone;

[0051] S3: sampling and counting the gas data introduced through the pre-desulfurization biogas sampling pipeline 12 arranged on the pre-desulfurization biogas pipeline 2 connected to the anaerobic fermentation tank 1, storing and recording the data before desulfurization through the biogas multi-component analyzer 11, and recording the component contents of CH4, H2S, O2, and CO2 passing through the pipeline;

[0052] S4: real-time monitoring of the instantaneous flow rate and cumulative flow rate of the biogas entering the anaerobic fermentation tank 1 by means of a biogas flow meter 10 disposed on the biogas pipeline 2 before desulfurization;

[0053] S5: a fermentation liquid ORP analyzer 14 is connected to the outside of the anaerobic fermentation tank 1 to monitor the redox potential of the fermentation liquid inside the anaerobic fermentation tank 1 in real time;

[0054] S6: Controlling the use of the biogas flow meter 10, the fermentation liquid ORP analyzer 14 and the variable frequency air blower 5 through the PID controller;

[0055] S7: After being treated by the anaerobic fermentation tank 1, the biogas multi-component analyzer 11 samples and counts the gas content and data after being treated through the desulfurized biogas pipeline 3 and the desulfurized biogas sampling pipeline 13 connected to both sides of the anaerobic fermentation tank 1;

[0056] S8: The biogas multi-component analyzer 11 compares the data before sampling in step S3 with the data after sampling in step S7 to obtain the change of desulfurization data before and after sampling.

[0057] As shown in the following table, the comparative data of the content of each component before and after desulfurization:

[0058] Serial number project unit Before desulfurization After desulfurization 1 H2S (content in biogas) ppm 2000-5000 ＜20 2 O2 (content in biogas) %vol 0 0-0.2 3 Sulfide (content in fermentation broth) % 100 10~30 4 Fe, Cr, Mn and other trace elements (content in fermentation liquid) % 100 120~160

[0059] Among them, trace elements such as sulfide, Fe, Cr, and Mn were compared with the concentration content in the fermentation liquid before desulfurization as 100%.

[0060] Specifically, in the process of using the PID controller to control the biogas flow meter 10, the biogas multi-component analyzer 11 and the variable frequency air blower 5, the PID controller 15 is first used to control the amount of air introduced into the biogas according to the real-time data of the biogas flow meter 10 and the biogas multi-component analyzer 11, and the flow rate is realized by the air flow meter and the flow control valve component a7; secondly, the PID controller 15 is used to control the amount of air introduced into the fermentation liquid according to the data of the fermentation liquid ORP analyzer 14, and the flow rate is realized by the air flow meter and the flow control valve component b9; Finally, the PID controller 15 controls the operating load of the variable frequency air fan 5 according to the air demand for biogas and fermentation liquid desulfurization to ensure the air supply, thereby meeting the gas demand for biogas and fermentation liquid desulfurization; in the anaerobic fermentation tank 1, intermittent micro-aeration is used to aerate the fermentation liquid to ensure the desulfurization effect of the fermentation liquid while avoiding the adverse effects of high ORP on the fermentation system. The intermittent micro-aeration method can increase the content of soluble trace elements in the fermentation liquid after the sulfide content is reduced, thereby improving the efficiency of anaerobic fermentation and increasing biogas production.

[0061] Working principle of the present invention:

[0062] By monitoring the hydrogen sulfide content in biogas before and after desulfurization, the biogas flow rate and the ORP of the fermentation liquid, the present invention can accurately control the amount of air or oxygen introduced into the biogas and the fermentation liquid, so as to achieve the purpose of simultaneously removing hydrogen sulfide from the biogas and the fermentation liquid, thereby reducing the influence of hydrogen sulfide and its products on the activity of anaerobic microorganisms in the fermentation liquid, increasing the metabolic rate of microorganisms, improving the biogas yield and quality, and reducing the problem of low COD removal rate caused by high sulfide ion concentration in the biogas liquid.

[0063] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A device for simultaneously removing hydrogen sulfide from biogas and fermentation liquid, characterized in that: The invention comprises an anaerobic fermentation tank (1), a biogas multi-component analyzer (11) connected to the anaerobic fermentation tank (1), the biogas multi-component analyzer (11) being connected to a biogas flow meter (10), the other end of the biogas flow meter (10) being respectively connected to a low-pressure gas mixing device (4) and a PID controller (15), the other end of the PID controller (15) being connected to a variable frequency air blower (5) and a fermentation liquid ORP analyzer (14), the fermentation liquid ORP analyzer (14) and the low-pressure gas mixing device (4) being respectively connected to the anaerobic fermentation tank (1); A pre-desulfurization biogas pipeline (2) and a post-desulfurization biogas pipeline (3) are respectively arranged at both ends of the anaerobic fermentation tank (1); the biogas flowmeter (10) and the low-pressure gas mixing device (4) are respectively arranged on the pre-desulfurization biogas pipeline (2); a pre-desulfurization biogas sampling pipeline (12) is extended and connected to the pre-desulfurization biogas pipeline (2); and a post-desulfurization biogas sampling pipeline (13) is extended and connected to the post-desulfurization biogas pipeline (3); the pre-desulfurization biogas sampling pipeline (12) and the post-desulfurization biogas sampling pipeline (13) are connected to the biogas multi-component analyzer (11); An air fan outlet (6) is extended from the outer end of the variable frequency air fan (5), and the air fan outlet (6) is respectively connected to a low-pressure gas mixing device connecting pipeline (16) and an anaerobic fermentation tank connecting pipeline (8); the low-pressure gas mixing device connecting pipeline (16) is arranged at one end of the low-pressure gas mixing device (4), and the other end of the anaerobic fermentation tank connecting pipeline (8) is connected to the anaerobic fermentation tank (1); an air flow meter and a flow control valve assembly a (7) are arranged on the low-pressure gas mixing device connecting pipeline (16), and an air flow meter and a flow control valve assembly b (9) are arranged on the anaerobic fermentation tank connecting pipeline (8).

2. A process for simultaneously removing hydrogen sulfide from biogas and fermentation liquid, characterized in that: The following process steps are implemented by using the device for synchronously removing hydrogen sulfide from biogas and fermentation liquid as described in claim 1: S1: First, biogas and gas in the fermentation liquid are input into the low-pressure gas mixing device (4); S2: The gas mixed by the low-pressure gas mixing device (4) is input into the interior of the anaerobic fermentation tank (1) connected to the low-pressure gas mixing device (4), and the biogas and air are mixed quickly and evenly in the low-pressure gas mixing device (4) in a controllable manner, so as to avoid the mixed gas being within the methane explosion hazard zone; S3: sampling and counting the gas data introduced through the pre-desulfurization biogas sampling pipeline (12) provided on the pre-desulfurization biogas pipeline (2) connected to the anaerobic fermentation tank (1), storing and recording the pre-desulfurization data through the biogas multi-component analyzer (11), and recording the component contents of CH4, H2S, O2, and CO2 passing through the pipeline; S4: real-time monitoring of the instantaneous flow rate and cumulative flow rate of biogas entering the anaerobic fermentation tank (1) by means of a biogas flow meter (10) arranged on the biogas pipeline (2) before desulfurization; S5: a fermentation liquid ORP analyzer (14) is connected to the outside of the anaerobic fermentation tank (1) to monitor the redox potential of the fermentation liquid inside the anaerobic fermentation tank (1) in real time; S6: Controlling the use of the biogas flow meter (10), the fermentation liquid ORP analyzer (14) and the variable frequency air blower (5) through the PID controller (15); S7: After being treated in the anaerobic fermentation tank (1), the biogas multi-component analyzer (11) samples and counts the gas content and data after being treated through the post-desulfurization biogas pipeline (3) and the post-desulfurization biogas sampling pipeline (13) connected to both sides of the anaerobic fermentation tank (1); S8: The biogas multi-component analyzer (11) compares the data before sampling in step S3 with the data after sampling in step S7 to obtain the change of desulfurization data before and after sampling.

3. A process for synchronously removing hydrogen sulfide from biogas and fermentation liquid according to claim 2, characterized in that: The PID controller (15) controls the amount of air introduced into the biogas according to real-time data from the biogas flow meter (10) and the biogas multi-component analyzer (11), and the amount of air circulated is achieved by the air flow meter and the flow control valve assembly a (7).

4. A process for simultaneously removing hydrogen sulfide from biogas and fermentation liquid according to claim 2, characterized in that: The PID controller (15) controls the amount of air introduced into the fermentation liquid according to data from the fermentation liquid ORP analyzer (14), and the amount of air circulated is achieved by an air flow meter and a flow control valve assembly b (9).

5. A process for simultaneously removing hydrogen sulfide from biogas and fermentation liquid according to claim 2, characterized in that: The PID controller (15) controls the operating load of the variable frequency air fan (5) according to the air demand for desulfurization of biogas and fermentation liquid to ensure the air supply.

6. A process for simultaneously removing hydrogen sulfide from biogas and fermentation liquid according to claim 2, characterized in that: The microbial reaction process in the fermentation liquid of the anaerobic fermentation tank (1) adopts an intermittent micro-aeration method.

7. A process for simultaneously removing hydrogen sulfide from biogas and fermentation liquid according to claim 2, characterized in that: The biogas multi-component analyzer (11) measures the biogas components in the channel, and the number of detections ranges from 6 to 24 times.

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