CN114735895B

CN114735895B - Device for quickly hydrolyzing biogas slurry and method for quickly hydrolyzing biogas slurry

Info

Publication number: CN114735895B
Application number: CN202210440842.3A
Authority: CN
Inventors: 闫占永; 刘墨; 杨明哲; 于家伊
Original assignee: Beijing Siliang Technology Co ltd
Current assignee: Beijing Siliang Technology Co ltd
Priority date: 2022-04-25
Filing date: 2022-04-25
Publication date: 2023-04-07
Anticipated expiration: 2042-04-25
Also published as: CN114735895A

Abstract

This device of quick enzymolysis natural pond liquid includes: the anaerobic biogas slurry unit, the enzymolysis tank, the sedimentation tank, the sludge impoundment, the disinfection unit, the counter, the oxidation pond, solid-liquid separation machine, the enzymolysis agent feeding tank, the air-blower, the back flow, the mud pipe, the overflow pipe, aeration pipe and water collecting pipe, the sedimentation tank is installed in the enzymolysis tank, the hypomere of sedimentation tank is the back taper, the upper segment is cylinder or cube, the hypomere of sedimentation tank is opened there is the sedimentation tank entry, the water collecting pipe is equipped with in the upper segment of sedimentation tank, at least one back flow pipe is equipped with in the enzymolysis tank, the lower extreme of back flow pipe lets in the bottom of sedimentation tank, the upper end of back flow pipe stretches to the liquid level top of enzymolysis tank, the air inlet of back flow pipe lower extreme links to each other with the air-blower air supply pipe, at least one mud pipe is equipped with in the enzymolysis tank, the lower extreme of mud pipe stretches into the enzymolysis tank bottom, the upper end of mud pipe stretches into the liquid level top of sludge impoundment tank, the air inlet of mud pipe lower extreme links to each other with the air-blower, at least one overflow pipe is equipped with between the enzymolysis sludge impoundment tank and the enzymolysis sludge impoundment above the mud tank.

Description

Device for quickly hydrolyzing biogas slurry and method for quickly hydrolyzing biogas slurry

Technical Field

The invention is used for the field of quick biogas slurry enzymolysis recycling application. After the biogas slurry is subjected to rapid enzymolysis treatment, the environmental pollution is avoided, the biogas slurry can be recycled, the organic agriculture development is promoted, the market competitiveness of agricultural products is enhanced, and great social benefits are achieved.

Background

The scale breeding industry of China is continuously expanded, a large amount of biogas slurry is generated, and the problem cannot be solved by directly discharging the biogas slurry and consuming the biogas slurry on the spot in the past. If the treatment can not be carried out reasonably, the resource waste or the secondary pollution to the environment can be caused. At present, the wastewater of the large-scale pig farm in China is generally treated by adopting an anaerobic-aerobic combined process, however, the biogas slurry after anaerobic treatment contains a large amount of refractory organic matters, and has high nitrogen and phosphorus content and low carbon-nitrogen ratio, so when the traditional wastewater treatment methods such as a contact oxidation method, an SBR method, an oxidation ditch method and the like are adopted, the treatment effect is not ideal, the operation is unstable, and the construction and operation cost is high.

The farmland utilization after the biogas slurry enzymolysis treatment has great promotion effect on the development of organic agriculture. Besides N, P, K and other major elements necessary for crop growth, the biogas slurry also contains organic matters, humic acid and trace elements such as calcium, copper, iron and the like, and is rich and comprehensive in nutrition. The biogas slurry is utilized in farmlands after enzymolysis treatment, so that the soil can be effectively improved, the growth of crops is promoted, and the development of organic agriculture is promoted.

Disclosure of Invention

In order to solve the problems, the invention aims to provide a device for quickly performing enzymolysis on biogas slurry and a method for quickly performing enzymolysis on biogas slurry. The invention has less equipment, lower requirement on the equipment and less difficulty in engineering implementation. Because the enzymolysis efficiency is high and the reaction speed is high, the retention time can be greatly shortened by 1-3 months compared with the conventional treatment.

The invention relates to a device for quickly hydrolyzing biogas slurry, which comprises: anaerobism natural pond liquid unit, the enzymolysis tank, the sedimentation tank, the sludge impoundment, the disinfection unit, the counter weight, the oxidation pond, solid-liquid separation machine, the enzymolysis agent is thrown the jar, the air-blower, the back flow, the mud pipe, the overflow pipe, aeration pipe and collecting pipe, the enzymolysis agent is thrown the jar and is linked to each other through first pump and enzymolysis pond entry, anaerobism natural pond liquid unit links to each other with the enzymolysis pond entry, the enzymolysis pond passes through the collecting pipe and links to each other with the disinfection unit, counter weight and oxidation pond pass through the pipeline and link to each other in proper order, the aeration pipe dress is in the bottom in enzymolysis pond, the air-blower dress is outside the enzymolysis pond, the air inlet of aeration pipe links to each other with the air-blower air supply pipe, the enzymolysis pond links to each other with the sludge impoundment, the sludge impoundment passes through the second pump and links to each other with solid-liquid separation machine, wherein: the sedimentation tank is arranged in the enzymolysis tank, the lower section of the sedimentation tank is in an inverted cone shape, the upper section of the sedimentation tank is a cylinder or a cube, the lower section of the sedimentation tank is provided with a sedimentation tank inlet, a water collecting pipe is arranged at the upper section of the sedimentation tank, at least one backflow pipe is arranged in the enzymolysis tank, the lower end of the backflow pipe is led into the bottom of the sedimentation tank, the upper end of the backflow pipe is extended to the upper part of the liquid level of the enzymolysis tank, the air inlet at the lower end of the backflow pipe is connected with an air blower air supply pipe, at least one sludge discharge pipe is arranged in the enzymolysis tank, the lower end of the sludge discharge pipe is extended into the bottom of the enzymolysis tank, the upper end of the sludge discharge pipe is extended into the liquid level of the sludge tank, the air inlet at the lower end of the sludge discharge pipe is connected with the air blower air supply pipe, at least one overflow pipe is arranged between the enzymolysis tank above the sludge tank and the sludge tank, and the position of the lower section of the sedimentation tank at the lower section of the sedimentation tank is higher than the position of the lower section of the backflow pipe which is led into the sedimentation tank.

The invention relates to a device for rapid enzymolysis of biogas slurry, which comprises: it still includes: and the heater is arranged in the enzymolysis tank.

The invention relates to a device for rapid enzymolysis of biogas slurry, which comprises: it still includes: and the electric controller is respectively connected with the first pump, the second pump, the heater, the disinfection unit, the anaerobic biogas slurry unit, the solid-liquid separator, the meter and the blower through information wires.

The invention relates to a device for rapid enzymolysis of biogas slurry, which comprises: the enzymolysis tank is connected with the sludge tank on the same wall.

The invention relates to a device for quickly hydrolyzing biogas slurry, which comprises: the upper end of the return pipe 4 is 100-500mm higher than the liquid level of the enzymolysis tank.

The invention relates to a device for rapid enzymolysis of biogas slurry, which comprises: the effective water depth of the sedimentation tank and the enzymolysis tank is more than 1000mm, and the flow velocity entering the inlet 10 of the sedimentation tank is 0.02-0.1m/s.

The invention discloses a method for quickly hydrolyzing biogas slurry, which comprises the following steps: it includes:

(a) Biogas slurry from the anaerobic biogas slurry unit enters the enzymolysis tank from an inlet of the enzymolysis tank, the pH of the biogas slurry is 4-11, and the inlet water temperature is 10-30 ℃; meanwhile, the enzymolysis agent is added into the enzymolysis tank from an enzymolysis agent feeding tank through a first pump;

(b) The air blower is respectively connected with the return pipe, the aeration pipe and the sludge discharge pipe through the air supply pipe, biogas slurry enters the sedimentation tank through the inlet of the sedimentation tank for sedimentation, the sludge sedimentated in the sedimentation tank returns to the enzymolysis tank through the return pipe again, clear liquid in the sedimentation tank enters the disinfection unit through the water collection pipe, and after being disinfected by the disinfection unit, the clear liquid enters the oxidation pond from the outlet of the disinfection unit through the meter for storage, and in the season that crops need fertilization, the water stored in the oxidation pond is returned to the field for fertilization;

(c) The sludge at the bottom of the enzymolysis tank is sent into a sludge tank through a sludge discharge pipe, the sewage exceeding the effective liquid level of the sludge tank, and the clear water at the upper end of the sludge tank returns to the enzymolysis tank again through an overflow pipe;

(d) And the sludge at the bottom of the sludge tank is fed into a solid-liquid separator through a second pump, liquid and solid are separated, the solid is used for manufacturing an organic fertilizer, and the liquid returns to the anaerobic biogas slurry unit.

The invention discloses a method for quickly hydrolyzing biogas slurry, which comprises the following steps: the heater heats the biogas slurry in the enzymolysis tank to 10-30 ℃.

The invention relates to a method for quickly hydrolyzing biogas slurry, which comprises the following steps: the air blower blows air into the aeration pipe, so that the dissolved oxygen concentration of the biogas slurry in the enzymolysis tank is 0.1-5 mg/L.

The invention relates to a method for quickly hydrolyzing biogas slurry, which comprises the following steps: the dosage of the enzymolysis agent is 0.1-5 per mill of the mass of the biogas slurry, the biogas slurry and the enzymolysis agent are fully mixed in the enzymolysis tank, and the enzymolysis reaction time is 2-12 days.

The invention has the following beneficial effects:

1. after the biogas slurry is subjected to rapid enzymolysis treatment, the problem of environmental pollution is solved, and the problem of unstable operation in the traditional process is avoided. The biological enzyme is an environment-friendly preparation and can be completely biodegraded, secondary pollution can be caused to the environment when a large amount of chemical preparations are used, and the biological enzyme has no harm to the environment.

2. After the biogas slurry is subjected to rapid enzymolysis treatment, macromolecular organic matters are converted into micromolecular substances which are easy to be absorbed by crops, so that the biogas slurry has high nutritional value and can realize water and fertilizer integration of agricultural development. The water and fertilizer application can be carried out scientifically according to the fertilizer demand and the physical and chemical properties of the soil. The biogas slurry can not only remarkably improve the utilization rate of the biogas slurry, but also reduce agricultural irrigation water due to the larger water content in the biogas slurry, and simultaneously has good effects of reducing the use amount of chemical fertilizers and improving soil hardening.

3. The invention can realize continuous water inlet and continuous water outlet, and can still carry out rapid enzymolysis treatment when the pH, the temperature or the concentration of the inlet water has large fluctuation, so the impact resistance is strong.

4. The enzymolysis system has the advantages of less unit equipment, lower energy consumption and stable operation. The operation and maintenance are simple. In the normal operation of the biogas slurry treatment facility, the addition of the enzymolysis agent is regulated and controlled according to the water quality and the water quantity of the discharged biogas slurry every day. Promotes the development of circular economy, can realize resource utilization and reduce the operation cost. The enzymolysis will be the trend, and its value will be continuously improved.

5. According to the invention, one or more enzymolysis agents are added to degrade macromolecular organic matters in the biogas slurry into hydrophilic micromolecular organic matters which are easy to be utilized by plants, so that resource agricultural utilization is achieved, and the pollution of the biogas slurry to the environment is reduced. The invention has the advantages of high enzymolysis efficiency, high reaction speed, mild reaction conditions, low equipment requirements, strong impact resistance to temperature and biogas slurry water quality fluctuation and the like.

6. The sedimentation tank, the enzymolysis tank and the return pipe are integrated together, so that the overall occupied area is greatly saved. The enzymolysis tank is jointly built with the sludge tank and the disinfection unit, so that the occupied area is saved, a longer pipeline between the sedimentation tank, the sludge tank and the disinfection unit is shortened, and the investment of civil engineering and pipes is saved.

Drawings

FIG. 1 is a schematic diagram of the device for rapid enzymolysis of biogas slurry according to the invention;

FIG. 2 is a schematic diagram showing the particle size distribution change of biogas slurry during the enzymolysis process;

FIG. 3 is a turbid turquoise color of the biogas slurry before enzymolysis;

FIG. 4 shows the color of the biogas slurry is changed from turbid turquoise before enzymolysis to clear reddish brown after enzymolysis.

In fig. 1, reference numeral 1 is a lagoon; reference numeral 2 is a sterilizing unit; reference numeral 3 is an enzymolysis tank; reference numeral 4 is a return pipe; reference numeral 5 is a sedimentation tank; reference numeral 6 is a sludge discharge pipe; reference numeral 7 is an overflow pipe; reference numeral 8 denotes a sludge tank; reference numeral 9 is a solid-liquid separator; reference numeral 10 is a sedimentation tank inlet; reference numeral 11 is a water collecting pipe; reference numeral 12 is a heater; reference numeral 13 is an enzymolysis agent feeding tank; reference numeral 14 is a blower; reference numeral 15 is an aeration tube; reference numeral 16 is a meter; reference numeral 17 is an electric controller; reference numeral 18 is an inlet of the enzymolysis tank; reference numeral 19 is a first pump; reference numeral 20 is a second pump; and the reference numeral 21 is an anaerobic biogas slurry unit.

Detailed Description

The invention will be further described with reference to specific embodiments, which are further illustrative of the invention,

and are not intended to limit the invention in any way. The embodiments are to be considered as illustrative and not restrictive.

As shown in figure 1, the device for quickly hydrolyzing biogas slurry comprises: the device comprises an anaerobic biogas slurry unit 21, an enzymolysis tank 3, a sedimentation tank 5, a sludge tank 8, a disinfection unit 2, a meter 16, an oxidation pond 1, a solid-liquid separator 9, an enzymolysis agent feeding tank 13, an air blower 14, a backflow pipe 4, a sludge discharge pipe 6, an overflow pipe 7, an aeration pipe 15, an electric controller 17, a heater 12 and a water collecting pipe 11, wherein the enzymolysis agent feeding tank 13 is connected with an enzymolysis tank inlet 18 through a first pump 19, the anaerobic biogas slurry unit 21 is connected with the enzymolysis tank inlet 18, the enzymolysis tank 3 is connected with the disinfection unit 2 through the water collecting pipe 11, the disinfection unit 2, the meter 16 and the oxidation pond 1 are sequentially connected through pipelines, the aeration pipe 15 is arranged at the bottom of the enzymolysis tank 3, the air blower 14 is arranged outside the enzymolysis tank 3, an air inlet of the aeration pipe 15 is connected with an air supply pipe 14 of the air blower 14, the enzymolysis tank 3 is connected with the sludge tank 8 on the same wall, the sludge tank 8 is connected with the solid-liquid separator 9 through a second pump 20, and the heater 12 is arranged in the enzymolysis tank 3. And the electric controller 17 is respectively connected with the first pump 19, the second pump 20, the heater 12, the disinfection unit 2, the anaerobic biogas slurry unit 21, the solid-liquid separator 9, the metering device 16 and the blower 14 through information wires, and the electric controller 17 is connected with the first pump 19, the second pump 20, the heater 12, the disinfection unit 2 and the blower 14 through information wires.

The sedimentation tank 5 is arranged in the enzymolysis tank 3, the effective water depth of the sedimentation tank 5 and the enzymolysis tank 3 is more than 1000mm, the lower section of the sedimentation tank 5 is in an inverted cone shape, the upper section of the sedimentation tank 5 is in a cylinder or a cube shape, the lower section of the sedimentation tank 5 is provided with a sedimentation tank inlet 10, and the flow rate entering the sedimentation tank inlet 10 is 0.02-0.1m/s. The upper section of a sedimentation tank 5 is provided with a water collecting pipe 11, at least one backflow pipe 4 is arranged in an enzymolysis tank 3, the lower end of the backflow pipe 4 is led into the bottom of the sedimentation tank 5, the upper end of the backflow pipe 4 extends to the position above the liquid level of the enzymolysis tank 3 and is 100-500mm higher than the liquid level of the enzymolysis tank 3, the air inlet at the lower end of the backflow pipe 4 is connected with an air supply pipe of an air blower 14, at least one sludge discharge pipe 6 is arranged in the enzymolysis tank 3, the lower end of the sludge discharge pipe 6 extends into the bottom of the enzymolysis tank 3, the upper end of the sludge discharge pipe 6 extends to the position above the liquid level of a sludge tank 8, the air inlet at the lower end of the sludge discharge pipe 6 is connected with an air supply pipe of the air blower 14, at least one overflow pipe 7 is arranged between the enzymolysis tank 3 and the sludge tank 8 above the sludge discharge pipe 6, and the position of the lower section of the sedimentation tank 5, and the position of the lower section of the sedimentation tank inlet 10 of the backflow pipe 4 which is led into the lower section of the sedimentation tank 5 are higher than that of the lower section of the sedimentation tank 5.

The method for quickly hydrolyzing biogas slurry comprises the following steps:

(a) Biogas slurry from the anaerobic biogas slurry unit 21 enters the enzymolysis tank 3 from the inlet 18 of the enzymolysis tank, the pH of the biogas slurry is 4-11, the water inlet temperature is 10-30 ℃, and when the temperature does not reach, the heater 12 heats the biogas slurry in the enzymolysis tank 3 to 10-30 ℃; meanwhile, an enzymolysis agent is added into the enzymolysis tank 3 from an enzymolysis agent feeding tank 13 through a first pump 19, the dosage of the enzymolysis agent is 0.1-5 per mill of the mass of the biogas slurry, and the biogas slurry and the enzymolysis agent are fully mixed in the enzymolysis tank 3;

(b) The blower 14 is respectively connected with the return pipe 4, the aeration pipe 15 and the sludge discharge pipe 6 through the air supply pipe, so that the dissolved oxygen concentration of the biogas slurry in the enzymolysis tank 3 is 0.1-5mg/L, the biogas slurry enters the sedimentation tank 5 through the sedimentation tank inlet 10 for sedimentation, the sludge precipitated in the sedimentation tank 5 returns to the enzymolysis tank 3 through the return pipe 4 again, the clear liquid in the sedimentation tank 5 enters the disinfection unit 2 through the water collection pipe 11, after being disinfected by the disinfection unit 2, the clear liquid enters the oxidation pond 1 from the outlet of the disinfection unit 2 through the meter 16 for storage, and in the season that crops need fertilization, the water stored in the oxidation pond 1 is returned to the field for fertilization;

(c) The sludge at the bottom of the enzymolysis tank 3 is sent into a sludge tank 8 through a sludge discharge pipe 6, and the sewage exceeding the effective liquid level of the liquid surface of the sludge tank 8 returns to the enzymolysis tank 3 through an overflow pipe 7 again;

(d) And the sludge at the bottom of the sludge tank 8 is sent into a solid-liquid separator 9 through a second pump 20, liquid and solid are separated, the solid is used for producing organic fertilizer, the liquid returns to an anaerobic biogas slurry unit 21, and the time of enzymolysis reaction is 2-12 days.

The water inlet of the enzymolysis tank 3 is biogas slurry, the pH value of the inlet water is 4-11, the water inlet temperature is 10-30 ℃, and the heater 12 can supplement the temperature and preserve the temperature of the enzymolysis tank 3. The aeration pipe 15 carries out uniform aeration on the bottom of the enzymolysis tank 3 to dissolve the oxygen concentration of 1-5mg/L, a certain amount of enzymolysis agent is added at the inlet 18 of the enzymolysis tank through an enzymolysis agent feeding tank 13, the mass of the enzymolysis agent is 0.1-5 per mill, and after full mixing, the enzymolysis reaction lasts for 2-12 days. The reflux of the reflux pipe 4 is used as power, and the reflux pipe 4 enables the sludge at the bottom of the sedimentation tank 5 to reflux to the front end of the enzymolysis tank 3 or the position 100-500mm above the liquid level of one side of the tank wall. The biogas slurry enters the sedimentation tank 5 from a sedimentation tank inlet 10 at the lower section of the sedimentation tank 5 after rapid enzymolysis, and is discharged from a water collecting pipe 11 through a water collecting pipe or a water collecting tank, and the effective water depth of the sedimentation tank 5 and the enzymolysis tank 3 is more than 1000mm. The sludge in the enzymolysis tank 3 flows back to the sludge tank 8 through the sludge discharge pipe 6, sludge is discharged from the sludge tank 8 at irregular intervals, the discharged sludge can be subjected to solid-liquid separation, the solid is used for manufacturing organic fertilizer, and the liquid returns to the anaerobic biogas slurry unit 21. The sludge tank 8 can overflow back to the enzymolysis tank 3. The effluent of the sedimentation tank 3 enters a disinfection unit 2, enters a metering unit 16 after disinfecting coliform, enters an oxidation pond 1 after metering, and is returned to the field for fertilization when the crops need fertilization. The electric controller 17 controls the operation of all the units, pumps and electric equipment of the solid-liquid separator in the whole enzymolysis process.

The biogas slurry almost does not contain water-soluble micromolecule organic matters before enzymolysis, the water-soluble micromolecule organic matters are obviously increased after enzymolysis, and the odor is obviously improved. In the enzymolysis process, indexes of organic matters, water-soluble micromolecular organic matters and NH3 are changed as follows:

after the biogas slurry is subjected to enzymolysis treatment, macromolecules are degraded into micromolecules, and the particle size is obviously reduced. The particle size distribution changes during the enzymatic hydrolysis process are shown in fig. 2.

Fig. 2 illustrates that the method for rapid enzymolysis of biogas slurry has the remarkable advantages of rapid enzymolysis and remarkably reduced particle size of biogas slurry after enzymolysis compared with the existing method for enzymolysis of biogas slurry.

After the biogas slurry is subjected to enzymolysis treatment, the biogas slurry is changed from turbid turquoise shown in figure 3 into clear reddish brown shown in figure 4, and the purification effect of the biogas slurry is improved.

The foregoing description is illustrative of the present invention and is not to be construed as limiting thereof, the scope of the invention being defined by the appended claims, which may be modified in any manner without departing from the spirit of the invention.

Claims

1. A device for fast enzymolysis of biogas slurry comprises: anaerobic biogas slurry unit (21), enzymolysis tank (3), sedimentation tank (5), sludge impoundment (8), disinfection unit (2), counter (16), oxidation pond (1), solid-liquid separation machine (9), enzymolysis agent feeding tank (13), air blower (14), back flow pipe (4), mud pipe (6), overflow pipe (7), aeration pipe (15) and collecting pipe (11), enzymolysis agent feeding tank (13) link to each other with enzymolysis tank entry (18) through first pump (19), anaerobic biogas slurry unit (21) link to each other with enzymolysis tank entry (18), enzymolysis tank (3) link to each other with disinfection unit (2) through collecting pipe (11), disinfection unit (2), counter (16) and oxidation pond (1) link to each other in proper order through the pipeline, aeration pipe (15) dress is in the bottom of enzymolysis tank (3), air blower (14) dress is outside enzymolysis tank (3), the air inlet of aeration pipe (15) links to each other with air supply pipe (14) enzymolysis, sludge impoundment tank (3) links to each other with sludge impoundment (8), sludge impoundment (8) link to each other through second pump (9) and separation machine (20), its characteristics lie in that: sedimentation tank (5) dress is in enzymolysis tank (3), the hypomere of sedimentation tank (5) is the back taper, the upper segment is cylinder or cube, the hypomere of sedimentation tank (5) is opened there is sedimentation tank entry (10), water-collecting pipe (11) are equipped with in the upper segment of sedimentation tank (5), at least one back flow pipe (4) is equipped with in enzymolysis tank (3), the lower extreme of back flow pipe (4) lets in the bottom of sedimentation tank (5), the liquid level top of enzymolysis tank (3) is stretched to the upper end of back flow pipe (4), the air inlet of back flow pipe (4) lower extreme links to each other with air-blower (14) air supply pipe, at least one mud pipe (6) is equipped with in enzymolysis tank (3), the lower extreme of mud pipe (6) stretches into enzymolysis tank (3) bottom, the upper end of mud pipe (6) stretches into the liquid level top of sludge impoundment (8), the air inlet of mud pipe (6) lower extreme links to each other with air supply pipe (14) of air inlet pipe, enzymolysis tank (3) and sludge impoundment tank (8) above mud pipe (6), the lower extreme that sedimentation tank (7) that sediment tank (5) higher than lower extreme (5) let in sedimentation tank (5) position.

2. The device for rapidly hydrolyzing biogas slurry according to claim 1, characterized in that: it still includes: a heater (12), wherein the heater (12) is arranged in the enzymolysis tank (3).

3. The device for rapidly hydrolyzing biogas slurry according to claim 2, characterized in that: it still includes: the electric controller (17) is respectively connected with the first pump (19), the second pump (20), the heater (12), the disinfection unit (2), the anaerobic biogas slurry unit (21), the solid-liquid separator (9), the meter (16) and the air blower (14) through information wires.

4. The device for rapidly hydrolyzing biogas slurry according to claim 3, wherein: the enzymolysis tank (3) is connected with the sludge tank (8) on the same wall.

5. The device for rapidly hydrolyzing biogas slurry according to claim 4, characterized in that: the upper end of the return pipe (4) is 100-500mm higher than the liquid level of the enzymolysis tank (3).

6. The device for rapidly hydrolyzing biogas slurry according to claim 5, wherein: the effective water depth of the sedimentation tank (5) and the enzymolysis tank (3) is more than 1000mm, and the flow velocity entering the inlet (10) of the sedimentation tank is 0.02-0.1m/s.

7. The method for rapidly hydrolyzing biogas slurry by using the device for rapidly hydrolyzing biogas slurry according to claim 6, is characterized in that: it includes:

(a) Biogas slurry from an anaerobic biogas slurry unit (21) enters an enzymolysis tank (3) from an enzymolysis tank inlet (18), the pH of the biogas slurry is 4-11, and the water inlet temperature is 10-30 ℃; meanwhile, the zymolytic agent is added into the zymolytic tank (3) from a zymolytic agent feeding tank (13) through a first pump (19);

(b) The air blower (14) is respectively connected with the return pipe (4), the aeration pipe (15) and the sludge discharge pipe (6) through the air supply pipe, biogas slurry enters the sedimentation tank (5) through the sedimentation tank inlet (10) for sedimentation, the sludge precipitated in the sedimentation tank (5) returns to the enzymolysis tank (3) through the return pipe (4), clear liquid in the sedimentation tank (5) enters the disinfection unit (2) through the water collection pipe (11), and enters the oxidation pond (1) from the outlet of the disinfection unit (2) through the meter (16) for storage after being disinfected by the disinfection unit (2), and water stored in the oxidation pond (1) is returned to the field for fertilization in the season when crops need fertilization;

(c) The sludge at the bottom of the enzymolysis tank (3) is sent into a sludge tank (8) through a sludge discharge pipe (6), and the sewage exceeding the effective liquid level of the liquid surface of the sludge tank (8) returns to the enzymolysis tank (3) through an overflow pipe (7);

(d) And the sludge at the bottom of the sludge tank (8) is sent into a solid-liquid separator (9) through a second pump (20), liquid and solid are separated, the solid is used for manufacturing organic fertilizer, and the liquid returns to the anaerobic biogas slurry unit (21).

8. The method for rapid enzymolysis of biogas slurry as claimed in claim 7, wherein: the heater (12) heats the biogas slurry in the enzymolysis tank (3) to 10-30 ℃.

9. The method for rapid enzymolysis of biogas slurry as claimed in claim 8, wherein: the air blower (14) blows air into the aeration pipe (15), so that the dissolved oxygen concentration of the biogas slurry in the enzymolysis tank (3) is 0.1-5 mg/L.

10. The method for rapid enzymolysis of biogas slurry as claimed in claim 9, wherein: the dosage of the zymolytic agent is 0.1-5 per mill of the mass of the biogas slurry, the biogas slurry and the zymolytic agent are fully mixed in the zymolytic tank (3), and the time of zymolytic reaction is 2-12 days.