Device and method for preparing biogas by utilizing white rot fungi and calcium peroxide to strengthen anaerobic digestion of agricultural organic wastes

Abstract

The invention belongs to the technical field of recycling of agricultural organic wastes, and particularly relates to a device and a method for preparing biogas by utilizing white rot fungi and calcium peroxide to strengthen anaerobic digestion of agricultural organic wastes. White rot fungi and calcium peroxide are utilized, anaerobic digestion of agricultural organic waste is enhanced, and the biological natural gas is prepared. Calcium peroxide is used as an oxygen releasing agent to provide a micro-aerobic environment for anaerobic digestion, and stable growth of white rot fungi and secretion of lignin degrading enzyme are ensured, so that lignin is effectively degraded, cellulose and hemicellulose are more sufficiently utilized by hydrolytic acidification bacteria, and the hydrolytic acidification period is shortened; white rot fungi change the generation concentration and variety of humus in the anaerobic digestion process, more humus capable of playing the role of electron shuttles is formed, and a stable biogas production system is formed. The white rot fungi can quickly consume oxygen in an anaerobic digestion system, so that the adverse effect of the oxygen on anaerobic methanogens is reduced, and the methane production efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of agricultural organic waste resource utilization, and specifically relates to a device and method for preparing biogas by utilizing white rot fungi and calcium peroxide to strengthen anaerobic digestion of agricultural organic waste. Background Art

[0002] Agricultural production activities generate agricultural organic waste every year, mainly including straw and livestock manure. Anaerobic digestion can convert agricultural organic waste into raw materials for biogas, such as biogas. After purification and decarbonization, biogas can generate biogas with a methane content of more than 95%, which is a green way to treat organic waste.

[0003] However, lignocellulose, one of the main carbon sources in agricultural organic waste, has a complex structure. Lignin envelops intertwined cellulose and hemicellulose, hindering their biodegradation and utilization. Consequently, lignocellulose leads to slow hydrolysis and low gas production during anaerobic digestion of agricultural organic waste.

[0004] Researchers have found that by adding microbial agents that can degrade lignin, it is expected to break the lignin structure, releasing cellulose and hemicellulose structures, making the cellulose and hemicellulose structures more easily utilized by hydrolytic acidification bacteria, and shortening the hydrolysis and acidification cycle.

[0005] White-rot fungi, a type of aerobic fungus, can secrete lignin-degrading enzymes such as lignin peroxidase, manganese peroxidase, and laccase, and are commonly used in straw biopretreatment. However, when white-rot fungi are directly added as microbial agents to anaerobic digestion units, the lack of oxygen prevents their accumulation and effective secretion of lignin-degrading enzymes, limiting their ability to degrade lignin. Consequently, the gas production rate from anaerobic digestion of agricultural organic waste remains low. Summary of the Invention

[0006] The purpose of the present invention is to provide a device and method for preparing biogas through anaerobic digestion of agricultural organic waste. The device provided by the present invention uses white rot fungi and calcium peroxide to enhance the anaerobic digestion of agricultural organic waste to prepare biogas, which can increase the gas production rate of anaerobic digestion of agricultural organic waste by white rot fungi.

[0007] In order to achieve the above object, the present invention provides the following technical solutions: The present invention provides a device for producing biogas by enhancing anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide, comprising a continuous stirred tank reactor; an agitator is provided inside the continuous stirred tank reactor; a discharge pipe is provided at the bottom of the side wall of the continuous stirred tank reactor; a calcium peroxide feeding pipe and a first exhaust pipe are provided on the top wall of the continuous stirred tank reactor; A feed tank; the feed tank is connected to the continuous stirred tank reactor; White rot fungus culture tank; the white rot fungus culture tank is connected to the continuous stirred tank reactor; A biogas purification device is connected to the continuous stirred tank reactor.

[0008] Preferably, the continuous stirred tank reactor is further provided with a pH probe and an oxidation-reduction potential probe.

[0009] The present invention also provides a method for producing biogas by anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide. The device for producing biogas by anaerobic digestion of agricultural organic waste using the above scheme comprises the following steps: The continuous stirred tank reactor is started, anaerobic digestion sludge is added to the continuous stirred tank reactor as seed sludge, agricultural organic waste in a feed tank is fed into the continuous stirred tank reactor, white rot fungus liquid in a white rot fungus culture tank is passed into the continuous stirred tank reactor, calcium peroxide is added into the continuous stirred tank reactor through a calcium peroxide feeding pipe, the anaerobic digestion sludge, agricultural organic waste, white rot fungus liquid and calcium peroxide are stirred and mixed by a stirrer, biogas is obtained through fermentation, and the biogas is passed into a biogas purification device through a first exhaust pipe for purification and decarbonization to obtain the biogas.

[0010] Preferably, the anaerobic digestion sludge comes from digestion sludge in an anaerobic fermentation tank; the concentration of the anaerobic digestion sludge is 68-72 g / L; and the volume fraction of the anaerobic digestion sludge in the continuous stirred tank reactor is 18-22%.

[0011] Preferably, the solid content of the agricultural organic waste is 8-12%; and the volume fraction of the agricultural organic waste in the continuous stirred tank reactor is 60-65%.

[0012] Preferably, the OD600 value of the white rot fungus liquid is 1.0-2.0; and the white rot fungus liquid is Phanerochaete chrysosporium liquid.

[0013] Preferably, the white rot fungus liquid is introduced intermittently; the interval between two adjacent intermittent introductions is 5 to 7 days; after each introduction of the white rot fungus liquid, the volume fraction of the white rot fungus liquid in the continuous stirred tank reactor is 5 to 10%.

[0014] Preferably, the calcium peroxide is added intermittently; the interval between two adjacent intermittent additions is 5 to 7 days; and the amount of calcium peroxide added each time is 0.05 to 0.1 g / g VSS (volatile suspended solids).

[0015] Preferably, the time point of adding the calcium peroxide is the same as the time point of introducing the white rot fungus liquid.

[0016] Preferably, the rotation speed of the stirrer is 80-120 rpm; the sludge retention time of the anaerobic digestion sludge is 20-30 days; the temperature of the continuous stirred tank reactor during the fermentation is 35-37°C, and the pH value is 6.8-7.5.

[0017] The present invention provides a device for producing biogas by strengthening anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide. The present invention uses white rot fungi and calcium peroxide to strengthen anaerobic digestion of agricultural organic waste to produce biogas.

[0018] First, calcium peroxide, as an oxygen-releasing agent, has a certain long-term oxygen supply capacity. White-rot fungi use the oxygen slowly released by calcium peroxide to provide a microaerobic environment for anaerobic digestion. The microaerobic environment is conducive to the enrichment of facultative white-rot fungi, ensuring the stable growth of white-rot fungi and the secretion of lignin-degrading enzymes (laccase, manganese peroxidase and lignin peroxidase). Lignin-degrading enzymes use microaerobic conditions to oxidize the phenolic and non-phenolic structures of lignin, thereby effectively degrading lignin, destroying the wrapping structure of lignin on cellulose and hemicellulose, increasing the contact area of ​​carbohydrates (cellulose and hemicellulose), and making cellulose and hemicellulose more fully utilized by hydrolytic acidifying bacteria, thereby shortening the hydrolysis and acidification cycle; white-rot fungi will change the concentration and type of humus generated during anaerobic digestion, forming more humus that can play the role of electron shuttles, and forming a stable biogas production system.

[0019] Secondly, while oxygen may negatively impact anaerobic methanogens, the white-rot fungi in this invention rapidly consume oxygen in the anaerobic digestion system, reducing its adverse effects on anaerobic methanogens and improving methane production efficiency, resulting in a high gas production rate. Thirdly, calcium peroxide slowly releases hydrogen peroxide during the anaerobic digestion process, destroying the structure of lignocellulose and helping to improve its biodegradability, thereby enhancing the efficiency of lignocellulose utilization by anaerobic methanogens. Fourthly, the calcium ions and hydroxide radicals generated by the decomposition of calcium peroxide have a certain pH-regulating ability, which can buffer the acid accumulation during the anaerobic digestion process.

[0020] The present invention also provides a method for producing biogas by enhancing anaerobic digestion of agricultural organic waste using white-rot fungi and calcium peroxide. This method can increase the gas yield from anaerobic digestion of agricultural organic waste using white-rot fungi, has low investment and operating costs, is simple to operate, and is environmentally friendly, making it suitable for industrial application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 Schematic diagram of the structure of a device for producing biogas by anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide; Figure 2 This is a graph showing the change in redox potential after adding calcium peroxide in Example 1; Figure numerals: 1 is a feed tank; 2 is a first feed pipe; 3 is a first valve; 4 is a first feed pump; 5 is a second feed pipe; 6 is a second valve; 7 is a white rot fungus culture tank; 8 is a third feed pipe; 9 is a third valve; 10 is a second feed pump; 11 is a fourth feed pipe; 12 is a fourth valve; 13 is a first insulation layer; 14 is a continuous stirred tank reactor; 15 is a pH probe; 16 is an oxidation-reduction potential probe; 17 is a stirrer; 18 is a closed loop; 19 is a motor; 20 is a calcium peroxide dosing pipe; 21 is a fifth valve; 22 is a first exhaust pipe; 23 is a sixth valve; 24 is a biogas purification device; 25 is a second exhaust pipe; 26 is a seventh valve; 27 is a second insulation layer; 28 is a discharge pipe; 29 is an eighth valve. DETAILED DESCRIPTION

[0023] The present invention provides a device for producing biogas by enhancing anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide, comprising a continuous stirred tank reactor 14; an agitator 17 is provided inside the continuous stirred tank reactor 14; a discharge pipe 28 is provided at the bottom of the side wall of the continuous stirred tank reactor 14; a calcium peroxide injection pipe 20 and a first exhaust pipe 22 are provided on the top wall of the continuous stirred tank reactor 14; Feed tank 1; the feed tank 1 is connected to the continuous stirred tank reactor 14; White rot fungus culture tank 7; the white rot fungus culture tank 7 is connected to the continuous stirred tank reactor 14; The biogas purification device 24 is connected to the continuous stirred tank reactor 14.

[0024] The device provided by the present invention for preparing biogas by enhancing anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide includes a continuous stirred tank reactor 14; the continuous stirred tank reactor 14 can also be provided with a closed loop 18 and a motor 19; the stirrer 17 can pass through the closed loop 18 and be connected to the motor 19.

[0025] In the present invention, the continuous stirred tank reactor 14 may further be provided with a pH probe 15 and an oxidation-reduction potential probe 16 ; the pH probe 15 and the oxidation-reduction potential probe 16 may be independently connected to the inner side of the top wall of the continuous stirred tank reactor 14 .

[0026] In the present invention, the continuous stirred tank reactor 14 may further be provided with a first insulation layer 13 and a second insulation layer 27 ; the first insulation layer 13 and the second insulation layer 27 may together completely wrap the sidewall of the continuous stirred tank reactor 14 .

[0027] In the present invention, the continuous stirred tank reactor 14 may further be provided with an eighth valve 29 ; the continuous stirred tank reactor 14 may be connected to the eighth valve 29 via a discharge pipe 28 .

[0028] In the present invention, the continuous stirred tank reactor 14 may further be provided with a fifth valve 21 ; the continuous stirred tank reactor 14 may be connected to the fifth valve 21 via a calcium peroxide dosing pipe 20 .

[0029] In the present invention, the continuous stirred tank reactor 14 may be further provided with a sixth valve 23 ; the continuous stirred tank reactor 14 may be connected to the sixth valve 23 via a first exhaust pipe 22 ; the sixth valve 23 may be in communication with the bottom of the side wall of the biogas purification device 24 .

[0030] The device provided by the present invention for preparing biogas by enhancing anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide includes a feed tank 1; the feed tank 1 can be connected to the continuous stirred tank reactor 14 through a first feed pipe 2; a first valve 3 can be provided between the first feed pipe 2 and the continuous stirred tank reactor 14; the first valve 3 can be connected to the continuous stirred tank reactor 14 through a first feed pump 4, a second feed pipe 5 and a second valve 6 in sequence; the second valve 6 can be connected to the top of the side wall of the continuous stirred tank reactor 14.

[0031] The device provided by the present invention for producing biogas by enhancing anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide includes a white rot fungus culture tank 7; the white rot fungus culture tank 7 can be connected to the continuous stirred tank reactor 14 through a third feed pipe 8, a third valve 9, a second feed pump 10, a fourth feed pipe 11 and a fourth valve 12 in sequence; the fourth valve 12 can be connected to the top of the side wall of the continuous stirred tank reactor 14.

[0032] The device provided by the present invention for preparing biogas by enhancing anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide includes a biogas purification device 24; the biogas purification device 24 can be connected to the continuous stirred tank reactor 14 through a sixth valve 23; the biogas purification device 24 can be provided with a second exhaust pipe 25 and a seventh valve 26; the biogas purification device 24 can be connected to the seventh valve 26 through the second exhaust pipe 25; the second exhaust pipe 25 can be provided on the top of the side wall of the biogas purification device 24.

[0033] The structure of the device for producing biogas by using white rot fungi and calcium peroxide to strengthen anaerobic digestion of agricultural organic waste is as follows: Figure 1 As shown, specifically, the outside of the continuous stirred tank reactor 14 is provided with a first insulation layer 13 and a second insulation layer 27, and the inside of the continuous stirred tank reactor 14 is provided with a pH probe 15, an oxidation-reduction potential probe 16 and a stirrer 17, the stirrer 17 is connected to the motor 19 through a closed loop 18, one end of the first feed pump 4 is connected to the feed tank 1 through the first feed pipe 2 and the first valve 3, and the other end is connected to the upper end of the continuous stirred tank reactor 14 through the second feed pipe 5 and the second valve 6, and one end of the second feed pump 10 is connected to the feed tank 1 through the third feed pipe 8 and the third valve 9. The first end of the continuous stirring tank reactor 14 is connected to the white rot fungus culture tank 7, and the other end is connected to the upper end of the continuous stirring tank reactor 14 through the fourth feed pipe 11 and the fourth valve 12; the calcium peroxide addition pipe 20 is fixed to the upper cover of the continuous stirring tank reactor 14 and is provided with a fifth valve 21; the first exhaust pipe 22 is fixed to the upper cover of the continuous stirring tank reactor 14 and is connected to the lower end of the biogas purification device 24 through the sixth valve 23; the second exhaust pipe 25 and the seventh valve 26 are connected to the upper end of the biogas purification device 24; the discharge pipe 28 and the eighth valve 29 are fixed to the lower end of the continuous stirring tank reactor 14.

[0034] The present invention also provides a method for producing biogas by anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide. The device for producing biogas by anaerobic digestion of agricultural organic waste using the above scheme comprises the following steps: The continuous stirred tank reactor 14 is started, anaerobic digestion sludge is added to the continuous stirred tank reactor 14 as seed sludge, agricultural organic waste in the feed tank 1 is fed into the continuous stirred tank reactor 14, the white rot fungus liquid in the white rot fungus culture tank 7 is passed into the continuous stirred tank reactor 14, calcium peroxide is added into the continuous stirred tank reactor 14 through the calcium peroxide feeding pipe 20, the anaerobic digestion sludge, agricultural organic waste, white rot fungus liquid and calcium peroxide are stirred and mixed by the stirrer 17, biogas is obtained by fermentation, and the biogas is passed into the biogas purification device 24 through the first exhaust pipe 22 for purification and decarbonization to obtain the biogas.

[0035] The present invention adds anaerobic digestion sludge to the continuous stirred tank reactor 14 as seed sludge. In the present invention, the anaerobic digestion sludge can be digested sludge from an anaerobic fermentation tank; the concentration of the anaerobic digestion sludge can be 68-72 g / L, specifically 70 g / L; and the volume fraction of the anaerobic digestion sludge in the continuous stirred tank reactor 14 can be 18-22%, specifically 20%.

[0036] The present invention feeds the agricultural organic waste in the feed tank 1 into the continuous stirred tank reactor 14. In the present invention, the solid content of the agricultural organic waste can be 8-12 wt%, specifically 10 wt%; the solid content of the agricultural organic waste can be adjusted by adding water.

[0037] In the present invention, the volume fraction of the agricultural organic waste in the continuous stirred tank reactor 14 may be 60-65%, specifically 60%, 63% or 65%.

[0038] In the present invention, the white rot fungus culture liquid in the white rot fungus culture tank 7 is passed into the continuous stirred tank reactor 14. In the present invention, the OD600 value of the white rot fungus culture liquid can be 1.0-2.0, specifically 1.5; the culture liquid in the white rot fungus culture tank 7 can be potato glucose water; and the white rot fungus culture liquid can be a Phanerochaete chrysosporium culture liquid.

[0039] In the present invention, the white rot fungus liquid can be introduced intermittently; the interval between two adjacent intermittent introductions can be 5 to 7 days, specifically 6 days.

[0040] In the present invention, each time the white rot fungus liquid is introduced, the volume fraction of the white rot fungus liquid in the continuous stirred tank reactor 14 may be 5-10%, specifically 6%, 7.5% or 8%.

[0041] The present invention adds calcium peroxide to the continuous stirred tank reactor 14 via a calcium peroxide addition pipe 20. In the present invention, the calcium peroxide can be added intermittently; the interval between two adjacent intermittent additions can be 5 to 7 days, specifically 6 days; the addition time of the calcium peroxide can be the same as the introduction time of the white rot fungus liquid.

[0042] In the present invention, the dosage of calcium peroxide each time may be 0.05-0.1 g / gVSS (volatile suspended solids), specifically 0.075 g / gVSS.

[0043] In the present invention, an agitator 17 is used to mix anaerobic digestion sludge, agricultural organic waste, white rot fungus liquid, and calcium peroxide to produce biogas through fermentation. In the present invention, the rotation speed of the agitator 17 can be 80 to 120 rpm, specifically 100 rpm. The sludge retention time of the anaerobic digestion sludge can be 20 to 30 days, specifically 25 days.

[0044] In the present invention, during the fermentation, the temperature of the continuous stirred tank reactor 14 may be 35-37° C., specifically 36° C., and the pH value may be 6.8-7.5, specifically 7.2.

[0045] After obtaining the biogas, the present invention passes the biogas through the first exhaust pipe 22 into the biogas purification device 24 for purification and decarbonization to obtain the biogas. In the present invention, the purification and decarbonization temperature can be 25-40°C, specifically 30°C, 40°C or 50°C.

[0046] In the present invention, the biogas purification device 24 is provided with a hollow fiber membrane; the hollow fiber membrane may be polyetherimide; the operating pressure of the biogas purification device 24 may be 8 to 20 bar, specifically 12 bar or 16 bar. The present invention achieves biogas purification through hollow fiber membrane separation technology.

[0047] In order to further illustrate the present invention, the scheme of the present invention is described in detail below with reference to the accompanying drawings and embodiments, but they should not be understood as limiting the scope of protection of the present invention.

[0048] Example 1 This embodiment uses the device for producing biogas by enhancing anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide as described in the above scheme to produce biogas. The specific steps are as follows: When the continuous stirred tank reactor 14 is started, digested sludge taken from the anaerobic fermentation tank is added as inoculum sludge. The concentration of the digested sludge is 22 g / L, and the digested sludge accounts for 20% of the volume of the continuous stirred tank reactor 14.

[0049] Water was added to the agricultural organic waste (50 g corn straw (93% solid content) and 150 g cow dung (36% solid content)) in the feed pool 1 to adjust the solid content of the agricultural organic waste to 10%. The first feed pump 4 was turned on to allow the material to enter the continuous stirred tank reactor 14 through the first feed pipe 2, the first valve 3, the second feed pipe 5 and the second valve 6. The agricultural organic waste accounted for 60% of the volume of the continuous stirred tank reactor 14.

[0050] The temperature in the continuous stirred tank reactor 14 was controlled at 37° C., the pH value was controlled at 7.2, the rotation speed of the agitator 17 was controlled at 100 rpm, and the sludge retention time was controlled at 25 days.

[0051] The culture medium in the white rot fungus culture tank 7 is potato glucose water, the OD600 value of the white rot fungus culture liquid is set to 1.5, and the white rot fungus culture liquid is added every 6 days at a volume of 7.5% of the volume of the continuous stirred tank reactor 14.

[0052] While adding the white rot fungus solution, 0.075 g / gVSS of calcium peroxide is added through the calcium peroxide addition pipe 20, and the addition interval is 6 days.

[0053] The biogas generated by the continuous stirred tank reactor 14 is discharged through the first exhaust pipe 22 to the biogas purification device 24 for purification and decarbonization to obtain biogas, which is then discharged through the second exhaust pipe.

[0054] Example 2 A 1-liter continuous stirred-tank reactor (14) was inoculated with anaerobic fermentation sludge at 20% of its total volume. Agricultural organic waste, consisting of 50 g corn straw (93% solids content) and 150 g cow dung (36% solids content), was introduced, with the feed solids content adjusted to 10%. The temperature of the reactor was maintained at 37°C, the pH was 7.2, and the agitator speed was 100 rpm. A 7.5% suspension of Phanerochaete chrysosporium with an OD600 of 1.5 was added to the reactor at intervals of 6 days. Calcium peroxide at a concentration of 0.075 g / g VSS was also added at intervals of 6 days. The sludge retention time (SRT) was controlled at 30 days, and the reactor was operated for 30 days.

[0055] In this example, the biogas yield was 92.1 mL / gVS, the lignin removal rate was 21.3%, the cellulose removal rate was 23.9%, and the hemicellulose removal rate was 53.1%. After 30 days of operation, the capacitance of the discharge sample (indicating the electron transfer capacity of the microorganism) was 1.4 mF, and the relative abundance of Phanerochaete chrysosporium in the fungal community structure was 89.1%.

[0056] The change in redox potential after adding calcium peroxide to the continuous stirred tank reactor 14 was tested, and the results were as follows: Figure 2 As shown. Figure 2 It can be seen that the continuous stirred tank reactor 14 changes from a strictly anaerobic environment (below -300 mV) to a microaerobic environment (0~-300 mV) for part of the time period.

[0057] Comparative Example 1 The method of this comparative example is the same as that of Example 2, except that calcium peroxide is not added, the Phanerochaete chrysosporium bacterial liquid is added after being sterilized at 121° C. for 20 min, and other conditions are the same as those of Example 2.

[0058] The biogas yield in this comparative example was 72.9 mL / gVS, the lignin removal rate was 1.2%, the cellulose removal rate was 8.5%, the hemicellulose removal rate was 35.5%, the capacitance of the sample was 0.85 mF, and Phanerochaete chrysosporium was not detected in the fungal community structure.

[0059] Comparative Example 2 The method of this comparative example is the same as that of Example 2, except that: the bacterial solution of Phanerochaete chrysosporium is added after sterilization at 121°C for 20 min. Other conditions are the same as those of Example 2.

[0060] The biogas yield in this comparative example was 80.7 mL / gVS, the lignin removal efficiency was 15.7%, the cellulose removal efficiency was 13.6%, and the hemicellulose removal efficiency was 43.2%. The capacitance of the sample was 1.2 mF, and the relative abundance of Phanerochaete chrysosporium in the fungal community structure was only 0.2%.

[0061] It can be seen from the above examples that the device and method provided by the present invention can enrich white rot fungi and improve the gas production rate of anaerobic digestion of agricultural organic waste.

[0062] Although the above embodiment provides a detailed description of the present invention, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. A device for producing biogas by using white rot fungi and calcium peroxide to enhance anaerobic digestion of agricultural organic waste, characterized in that: including a continuous stirred tank reactor (14); The continuous stirred tank reactor (14) is provided with an agitator (17) inside; A discharge pipe (28) is provided at the bottom of the side wall of the continuous stirred tank reactor (14); The top wall of the continuous stirred tank reactor (14) is provided with a calcium peroxide feeding pipe (20) and a first exhaust pipe (22); A feed tank (1); the feed tank (1) is connected to the continuous stirred tank reactor (14); a white rot fungus culture tank (7); the white rot fungus culture tank (7) is connected to the continuous stirring tank reactor (14); A biogas purification device (24); the biogas purification device (24) is connected to the continuous stirred tank reactor (14).

2. The device for producing biogas by enhancing anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide according to claim 1, characterized in that: The continuous stirred tank reactor (14) is further provided with a pH probe (15) and an oxidation-reduction potential probe (16).

3. A method for producing biogas by anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide, comprising the following steps: The continuous stirred tank reactor (14) is started, anaerobic digestion sludge is added to the continuous stirred tank reactor (14) as seed sludge, agricultural organic waste in the feed tank (1) is fed into the continuous stirred tank reactor (14), white rot fungus liquid in the white rot fungus culture tank (7) is passed into the continuous stirred tank reactor (14), calcium peroxide is added into the continuous stirred tank reactor (14) through a calcium peroxide feeding pipe (20), the anaerobic digestion sludge, agricultural organic waste, white rot fungus liquid and calcium peroxide are stirred and mixed by a stirrer (17), biogas is obtained by fermentation, and the biogas is passed into a biogas purification device (24) through a first exhaust pipe (22) for purification and decarbonization to obtain the biogas.

4. The method for producing biogas by enhancing anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide according to claim 3, characterized in that: The anaerobic digested sludge comes from the digested sludge of the anaerobic fermentation tank; The concentration of the anaerobic digestion sludge is 68-72 g / L; The volume fraction of the anaerobic digestion sludge in the continuous stirred tank reactor (14) is 18-22%.

5. The method for producing biogas by enhancing anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide according to claim 3 or 4, characterized in that: The solid content of the agricultural organic waste is 8-12%; The volume fraction of the agricultural organic waste in the continuous stirred tank reactor (14) is 60-65%.

6. The method for producing biogas by enhancing anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide according to claim 3, characterized in that: The OD600 value of the white rot fungus liquid is 1.0-2.0; The white rot fungus liquid is Phanerochaete chrysosporium liquid.

7. The method for producing biogas by enhancing anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide according to claim 3 or 6, characterized in that: The white rot fungus liquid is introduced intermittently; The interval between two adjacent intermittent injections is 5 to 7 days; After the white rot fungus liquid is introduced each time, the volume fraction of the white rot fungus liquid in the continuous stirred tank reactor (14) is 5-10%.

8. The method for producing biogas by enhancing anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide according to claim 3, characterized in that: The calcium peroxide is intermittently added; The interval between two adjacent intermittent additions is 5 to 7 days; The dosage of calcium peroxide each time is 0.05-0.1 g / gVSS.

9. The method for producing biogas by enhancing anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide according to claim 3 or 8, characterized in that: The time point of adding the calcium peroxide is the same as the time point of introducing the white rot fungus liquid.

10. The method for producing biogas by enhancing anaerobic digestion of agricultural organic waste using white rot fungi and calcium peroxide according to claim 3, characterized in that: The rotation speed of the stirrer (17) is 80-120 rpm; The sludge retention time of the anaerobic digestion sludge is 20 to 30 days; During the fermentation, the temperature of the continuous stirred tank reactor (14) is 35-37°C, and the pH value is 6.8-7.5.

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