Solid waste resource recycling system and process

Abstract

The present application relates to the technical field of pollutant treatment, and discloses a solid waste resource recycling system, which comprises a residual sludge collecting device, a pretreatment homogenizing tank, an anaerobic fermentation tank, a gas storage tank, a generator set, a solid-liquid separation device, a butterfly tube type reverse osmosis device and an earthworm breeding area, the anaerobic fermentation tank comprises a second motor located at the center of the top end of the anaerobic fermentation tank and a three-phase separator penetrating through the upper end of the anaerobic fermentation tank.The present application mixes three kinds of solid waste with different components, i.e., residual sludge, livestock and poultry manure and biomass, in a certain proportion through the residual sludge collecting device, the pretreatment homogenizing tank, the anaerobic fermentation tank, the gas storage tank, the generator set, the solid-liquid separation device, the butterfly tube type reverse osmosis device and the earthworm breeding area; and the fermentation device with the functions of selective separation and high-speed mixing produces biogas, which can be used for power generation, thereby reducing power consumption and pressure and effectively reducing carbon emission.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pollutant treatment, in particular to a solid waste resource recycling system and process. BACKGROUND

[0002] In recent years, with the continuous promotion of rural revitalization, rural environmental problems have become a focus of continuous promotion. The treatment cost of residual sludge generated in the process of rural sewage treatment is high, the ineffective collection and discharge of livestock manure, the large use of chemical fertilizers and pesticides in the planting process, the small type of material composition in the traditional anaerobic fermentation process, the low reaction rate and incomplete reaction, etc. How to use the existing resources in rural areas to solve these problems has become a top priority.

[0003] A kind of excrement sludge treatment system is disclosed in Chinese patent (authorized publication number CN108862966B), the patent technology improves the flocculation effect of sludge by aeration assembly, so that sludge can better flocculation effect;The sludge deposited at the bottom of the flocculation tank can be effectively discharged from the bottom of the flocculation tank by the boost device, improving the treatment efficiency of sludge, but its treatment effect is not good, and the treatment cost is high. SUMMARY

[0004] The purpose of the present application is to provide a solid waste resource recycling system and process to solve the problems raised in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] The solid waste resource recycling system comprises a residual sludge collecting device, a pretreatment homogenizing tank, an anaerobic fermentation tank, a gas storage tank, a generator set, a solid-liquid separation device, a butterfly tube type reverse osmosis device and an earthworm breeding area, the anaerobic fermentation tank comprises a second motor located at the top center of the anaerobic fermentation tank, and a three-phase separator penetrating through the upper end of the anaerobic fermentation tank, the output end of the second motor is located at the inner center of the anaerobic fermentation tank and is provided with a second central stirring assembly, the inner side of the anaerobic fermentation tank is provided with a central selection separation cone at the lower end of the second central stirring assembly, and a peripheral reflux mixing part is arranged outside the central selection separation cone in the anaerobic fermentation tank, an overflow weir is arranged at the upper end of the inner side wall of the anaerobic fermentation tank, and a plurality of liquid internal circulation pipelines are arranged on the outer side wall of the anaerobic fermentation tank from top to bottom, a pipeline circulation pump is arranged on each liquid internal circulation pipeline, and a sedimentation tank is arranged at the center of the bottom end of the anaerobic fermentation tank.

[0007] As a further scheme of the present application: the pretreatment homogenizing tank comprises a first motor located at the top center of the pretreatment homogenizing tank, the output end of the first motor is located at the inner center of the pretreatment homogenizing tank and is provided with a first central stirring assembly, and a booster pump is arranged at the bottom end of the pretreatment homogenizing tank.

[0008] As a further scheme of the present application: a sludge output pipeline is connected between the sludge output end of the residual sludge collecting device and the sludge input end of the pretreatment homogenizing tank; and a material input pipeline is connected between the material output end of the lifting pump and the upper and lower feeding ends of the anaerobic fermentation tank respectively.

[0009] As a further scheme of the present application: a material output pipeline is connected between the discharging end of the sedimentation hopper and the feeding end of the solid-liquid separation device; a gas conveying pipeline is connected between the gas output end of the three-phase separator and the gas input end of the gas storage tank; a gas circulating pipeline is connected between the gas output end of the anaerobic fermentation tank and the gas output end of the gas storage tank, and a check valve is installed on the gas circulating pipeline near the anaerobic fermentation tank; a pressure regulating valve is installed on the gas conveying pipeline and the gas circulating pipeline near the gas storage tank, and a pressure gauge is installed on the gas storage tank; and the gas circulating pipeline is connected with the gas input end of the generator set.

[0010] As a further scheme of the present application: a separated liquid output pipeline is connected between the separated liquid output end of the solid-liquid separation device and the separated liquid input end of the butterfly valve type reverse osmosis device; a reverse osmosis concentrated liquid output pipeline is connected with the concentrated liquid output end of the butterfly valve type reverse osmosis device, and a reverse osmosis concentrated liquid return pipeline is connected between the concentrated liquid output end of the butterfly valve type reverse osmosis device and the feeding end of the solid-liquid separation device.

[0011] As a further scheme of the present application: a reverse osmosis clear liquid output pipeline is connected between the clear liquid output end of the butterfly valve type reverse osmosis device and the clear liquid input end of the earthworm breeding area; and a separated residue output pipeline is connected between the separated residue output end of the solid-liquid separation device and the separated residue input end of the earthworm breeding area.

[0012] The process of the solid waste resource recycling system comprises the following steps:

[0013] S1, the sludge collected in the residual sludge collecting device is mixed with human and livestock excrement and urine and biomass in a certain proportion, and then sent into the pretreatment homogenizing tank through the sludge output pipeline; then the first motor drives the first central stirring assembly to rotate, and the material is automatically stirred to fully crush and mix the material, so as to realize material pretreatment;

[0014] S2, the pretreated material is respectively fed into the anaerobic fermentation tank from the upper feeding end and the lower feeding end of the material input pipeline through the lifting pump, and the second center stirring assembly is rotated by the second motor to automatically stir the material, the sinking material forms a micro-uplift area through the center selection separation cone, the flow rate at the bottom thereof is increased to 0.1-1.3 mm / s, the suspended solid with a large particle size is separated and settled to enter the sedimentation hopper, the gas phase and the liquid phase are separated into solid, liquid and gas in the three-phase separator, the pipeline circulation pump is then started, the liquid is returned to the bottom of the anaerobic fermentation tank from the overflow weir through the liquid internal circulation pipeline, the gas enters the gas storage tank through the gas conveying pipeline connected with the three-phase separator, when the check valve is in the open state, part of the gas in the gas storage tank is returned to the bottom of the anaerobic fermentation tank through the gas circulation pipeline to form a circulating gas-liquid, and the circulating gas-liquid is subjected to gas-liquid internal circulation stirring after the peripheral return mixing component, the flow rate at the bottom thereof is increased to 2.7-3.6 mm / s, and anaerobic fermentation is realized;

[0015] S3, a reasonable amount of water is stored in the gas storage tank, the gas inlet pipe of the gas input end of the gas storage tank is inserted into the stored water, the gas outlet pipe of the gas output end of the gas storage tank is reserved above the water surface, the gas is pressed into the stored water by using the pressure difference, then escapes from the water, is discharged through the gas circulation pipeline, and the discharged biogas is connected to the generator set to produce electricity by using the biogas;

[0016] S4, the material after anaerobic fermentation is transported to the solid-liquid separation device through the material output pipeline to realize solid-liquid separation, the separated liquid is discharged through the separated liquid output pipeline, and the separated residue is discharged through the separated residue output pipeline;

[0017] S5, the separated liquid discharged through the separated liquid output pipeline enters the butterfly tube type reverse osmosis device, the clear liquid is discharged through the reverse osmosis clear liquid output pipeline after the concentrated liquid is treated again in the butterfly tube type reverse osmosis device, and part of the concentrated liquid is used for fertilizer processing, and the other part returns to the solid-liquid separation device through the reverse osmosis concentrated liquid return pipeline to be treated again by solid-liquid separation;

[0018] S6, the separated residue discharged through the separated residue output pipeline enters the earthworm breeding area, and the clear liquid discharged through the reverse osmosis clear liquid output pipeline is used for irrigation of the earthworm breeding area.

[0019] As a further scheme of the application, in the S2 step, the liquid internal circulation pipeline and the gas circulation pipeline are arranged at intervals, the interval angle is 60°, the peripheral return mixing component is provided with three components, and the angles of the three components are distributed at 120°, and the inclination angle of the sedimentation hopper is 45°-60°.

[0020] As a further scheme of the present application: in the S2 step, the distance between the top edge of the peripheral reflux mixing component and the inner side wall of the anaerobic fermentation tank is 10 times the distance between the bottom edge of the peripheral reflux mixing component and the inner side wall of the anaerobic fermentation tank; the top diameter of the central selective separation cone is 2-6 times the bottom diameter.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] 1. The residual sludge, livestock and poultry manure, and biomass are mixed in a certain proportion by the residual sludge collecting device, the pretreatment homogenizing tank, the anaerobic fermentation tank, the gas storage tank, the generator set, the solid-liquid separation device, the butterfly tube type reverse osmosis device, and the earthworm breeding area; the residual sludge, livestock and poultry manure, and biomass are mixed in a certain proportion; the mixed solid waste is produced into biogas by the fermentation device with selective separation and high-speed mixing functions, and can be used for power generation, reducing power supply energy consumption and pressure, and effectively reducing carbon emissions.

[0023] 2. The three-phase circulation, multi-stage stirring, and multi-stage feeding cooperative operation mode are used to solve the incomplete reaction in the anaerobic fermentation process, improve the system reaction efficiency, and ensure the output benefit.

[0024] 3. The high-value utilization is realized by the earthworm passing through the abdomen; the earthworm manure can be used for producing organic fertilizer or field utilization; the finished earthworms can be used for extracting earthworm active protein; the resource and energy consumption are maximally reduced in the process; meanwhile, waste zero emission is realized; the environmental benefits are good; the resource utilization rate is high; the economic benefits are good; the system is used for power generation, reducing power supply energy consumption and pressure, and effectively reducing carbon emissions. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a flowchart of the solid waste resource recycling system.

[0026] Figure 2 It is a cross-sectional view of the pretreatment homogenizing tank in the solid waste resource recycling system.

[0027] Figure 3 It is a cross-sectional view of the anaerobic fermentation tank in the solid waste resource recycling system.

[0028] Figure 4 It is a top view of the anaerobic fermentation tank in the solid waste resource recycling system.

[0029] In the figure: 1, residual sludge collecting device; 2, pretreatment homogenizing tank; 22, first central stirring assembly; 23, lifting pump; 24, first motor; 3, anaerobic fermentation tank; 31, liquid internal circulation pipeline; 32, three-phase separator; 33, second motor; 34, second central stirring assembly; 35, overflow weir; 36, central selective separation cone cylinder; 37, peripheral reflux mixing component; 38, sedimentation hopper; 4, gas storage tank; 41, pressure gauge; 5, generator set; 6, solid-liquid separation device; 7, butterfly tube type reverse osmosis device; 8, earthworm breeding area; 9, sludge output pipeline; 10, material input pipeline; 11, gas conveying pipeline; 12, gas circulation pipeline; 13, material output pipeline; 14, separated liquid output pipeline; 15, separated residue output pipeline; 16, reverse osmosis concentrated liquid output pipeline; 17, reverse osmosis clear liquid output pipeline; 18, reverse osmosis concentrated liquid reflux pipeline; 19, pipeline circulation pump; 20, pressure regulating valve; 21, check valve. DETAILED DESCRIPTION

[0030] Please refer to Figures 1-4 , in the embodiment of the present application, the solid waste resource recycling system comprises a residual sludge collecting device 1, a pretreatment homogenizing tank 2, an anaerobic fermentation tank 3, a gas storage tank 4, a generator set 5, a solid-liquid separation device 6, a butterfly tube type reverse osmosis device 7 and an earthworm breeding area 8. The anaerobic fermentation tank 3 comprises a second motor 33 located at the top center of the anaerobic fermentation tank 3, and a three-phase separator 32 penetrating through the upper end of the anaerobic fermentation tank 3. The output end of the second motor 33 is located at the inner center of the anaerobic fermentation tank 3 and is installed with a second central stirring assembly 34. The inner side of the anaerobic fermentation tank 3 is provided with a central selective separation cone cylinder 36 at the lower end of the second central stirring assembly 34. The outer side of the anaerobic fermentation tank 3 is provided with a peripheral reflux mixing component 37 at the lower end of the central selective separation cone cylinder 36. The upper end of the inner side wall of the anaerobic fermentation tank 3 is provided with an overflow weir 35. The outer side wall of the anaerobic fermentation tank 3 is provided with a plurality of liquid internal circulation pipelines 31 from top to bottom. Each liquid internal circulation pipeline 31 is installed with a pipeline circulation pump 19. The bottom center of the anaerobic fermentation tank 3 is provided with a sedimentation hopper 38.

[0031] In Figure 2 , the pretreatment homogenizing tank 2 comprises a first motor 24 located at the top center of the pretreatment homogenizing tank 2. The output end of the first motor 24 is located at the inner center of the pretreatment homogenizing tank 2 and is installed with a first central stirring assembly 22. The bottom of the inner side of the pretreatment homogenizing tank 2 is installed with a lifting pump 23.

[0032] In Figure 1 and Figure 2 , the sludge output end of the residual sludge collecting device 1 is connected with the sludge input end of the pretreatment homogenizing tank 2 through a sludge output pipeline 9. The material output end of the lifting pump 23 is connected with the upper and lower material input ends of the anaerobic fermentation tank 3 through a material input pipeline 10.

[0033] In Figure 1 , Figure 3 and Figure 4 , the discharge end of the sedimentation tank 38 is connected with the feed end of the solid-liquid separation device 6 through a material output pipeline 13; the gas output end of the three-phase separator 32 is connected with the gas input end of the gas storage tank 4 through a gas conveying pipeline 11; the gas output end of the anaerobic fermentation tank 3 is connected with the gas output end of the gas storage tank 4 through a gas circulating pipeline 12, and a check valve 21 is installed on the gas circulating pipeline 12 close to the anaerobic fermentation tank 3; a pressure regulating valve 20 is installed on the gas conveying pipeline 11 and the gas circulating pipeline 12 close to the gas storage tank 4, and a pressure gauge 41 is installed on the gas storage tank 4; the gas circulating pipeline 12 is connected with the gas input end of the generator set 5; the separated liquid output end of the solid-liquid separation device 6 is connected with the separated liquid input end of the butterfly valve type reverse osmosis device 7 through a separated liquid output pipeline 14; the concentrated liquid output end of the butterfly valve type reverse osmosis device 7 is connected with a reverse osmosis concentrated liquid output pipeline 16, and a reverse osmosis concentrated liquid return pipeline 18 is connected between the concentrated liquid output end of the butterfly valve type reverse osmosis device 7 and the feed end of the solid-liquid separation device 6; the clear liquid output end of the butterfly valve type reverse osmosis device 7 is connected with the clear liquid input end of the earthworm breeding area 8 through a reverse osmosis clear liquid output pipeline 17; and the separated residue output end of the solid-liquid separation device 6 is connected with the separated residue input end of the earthworm breeding area 8 through a separated residue output pipeline 15.

[0034] The process of the solid waste resource recycling system comprises the following steps:

[0035] S1, the sludge collected in the residual sludge collecting device 1 is mixed with livestock and poultry manure and biomass in a certain proportion, and then sent into the pretreatment homogenizing tank 2 through the sludge output pipeline 9; then the first center stirring assembly 22 is rotated by the first motor 24 to automatically stir the material, so that the material is fully pulverized, mixed, the amount of the material is adjusted, the composition of the material is balanced, and the material pretreatment is realized;

[0036] S2, the pretreated material is fed into the anaerobic fermentation tank 3 from the upper and lower feeding ends of the material input pipeline 10 through the lifting pump 23, and is automatically stirred by rotating the second central stirring assembly 34 driven by the second motor 33. The sinking material forms a micro-uplift area through the central selection separation cone 36, and the flow rate at the bottom increases to 0.1-1.3 mm / s, so that the suspended solids with large particle size are separated and settled to enter the sedimentation hopper 38. In the ascending material, the gas phase and the liquid phase are separated into solid, liquid and gas in the three-phase separator 32. Then the pipeline circulating pump 19 is opened, the liquid is returned to the bottom of the anaerobic fermentation tank 3 from the overflow weir 35 through the liquid internal circulation pipeline 31, and the gas enters the gas storage tank 4 through the gas conveying pipeline 11 connected with the three-phase separator 32. When the check valve 21 is in the open state, part of the gas in the gas storage tank 4 is returned to the bottom of the anaerobic fermentation tank 3 through the gas circulation pipeline 12 to form a circulating gas-liquid. After circulating through the peripheral reflux mixing component 37, the flow rate at the bottom increases to 2.7-3.6 mm / s, and the gas-liquid internal circulation stirring is carried out to realize anaerobic fermentation. Thus, hydrolysis, acidification, methanation and hydraulic screening are realized in the same space, and the combination of central stirring, high-speed gas-liquid circulation stirring, peripheral reflux mixing, central selection separation, efficient separation of large particle size sediment, full mixing of fine particle material, and increased contact opportunity of ascending flow and microorganisms are realized, so that the material and temperature distribution in the anaerobic fermentation tank 3 are uniform, a higher volumetric gas production rate in the anaerobic fermentation tank 3 is ensured, local condition accumulation is avoided, and the generated gas is quickly discharged;

[0037] S3, a reasonable amount of water is stored in the gas storage tank 4, the gas inlet pipe of the gas input end of the gas storage tank 4 is inserted into the stored water, and the gas outlet pipe of the gas output end of the gas storage tank 4 is reserved above the water surface. The gas is pressed into the stored water by pressure difference, then escapes from the water, and is discharged through the gas circulation pipeline 12. The discharged biogas is connected to the generator set 5 for biogas power generation;

[0038] S4, the anaerobically fermented material is transported to the solid-liquid separation device 6 through the material output pipeline 13 to realize solid-liquid separation. The separated liquid is discharged through the separated liquid output pipeline 14, and the separated residue is discharged through the separated residue output pipeline 15.

[0039] S5, the separated liquid discharged through the separated liquid output pipeline 14 enters the butterfly tube type reverse osmosis device 7. After the concentrated liquid is treated again in the butterfly tube type reverse osmosis device 7, the clear liquid is discharged through the reverse osmosis clear liquid output pipeline 17, and the concentrated liquid is discharged through the reverse osmosis concentrated liquid output pipeline 16. Part of the concentrated liquid is used for fertilizer processing, and the other part is returned to the solid-liquid separation device 6 through the reverse osmosis concentrated liquid return pipeline 18 for solid-liquid separation treatment again;

[0040] S6, the separated residue output pipeline 15 discharged into the earthworm breeding area 8, the clear liquid discharged through the reverse osmosis clear liquid output pipeline 17 is used for irrigation of the earthworm breeding area 8; the separated residue is over-perineal digestion by earthworms, and the produced earthworm manure can be used for production of organic fertilizer or field utilization, and the finished earthworms can be used for extraction of earthworm active protease, realizing high-value utilization.

[0041] In Figure 3 and Figure 4 , in the S2 step, the liquid inner circulation pipeline 31 and the gas circulation pipeline 12 are arranged at intervals, and the interval angle is 60°; the peripheral reflux mixing component 37 is provided with three, and the angles are distributed at 120°; the inclination angle of the sedimentation bucket 38 is 45°-60°, the distance between the top edge of the peripheral reflux mixing component 37 and the inner side wall of the anaerobic fermentation tank 3 is 10 times the distance between the bottom edge of the peripheral reflux mixing component 37 and the inner side wall of the anaerobic fermentation tank 3; the top diameter of the central selection separation cone 36 is 2-6 times the bottom diameter.

[0042] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art, according to the technical scheme and the inventive concept of the present application, within the technical range disclosed by the present application, makes equivalent replacement or change, should be covered in the protection scope of the present application.

Claims

1. A solid waste resource recycling system, characterized in that, The utility model relates to a sludge treatment system, which comprises a residual sludge collecting device (1), a pretreatment homogenizing tank (2), an anaerobic fermentation tank (3), a gas storage tank (4), a generator set (5), a solid-liquid separation device (6), a butterfly tube type reverse osmosis device (7) and an earthworm breeding area (8). The output end of the second motor (33) is located at the inner center position of the anaerobic fermentation tank (3) and is provided with a second central stirring assembly (34); the inner side of the anaerobic fermentation tank (3) is provided with a central selective separation cone (36) at the lower end of the second central stirring assembly (34); the upper end of the inner side wall of the anaerobic fermentation tank (3) is provided with an overflow weir (35); the outer side wall of the anaerobic fermentation tank (3) is provided with a plurality of liquid internal circulation pipelines (31) from top to bottom; each liquid internal circulation pipeline (31) is provided with a pipeline circulation pump (19); and the bottom end of the anaerobic fermentation tank (3) is provided with a sedimentation hopper (38).

2. The solid waste resource recycling system according to claim 1, wherein, The discharge end of the sedimentation hopper (38) is connected with the feeding end of the solid-liquid separation device (6) through a material output pipeline (13); the gas output end of the three-phase separator (32) is connected with the gas input end of the gas storage tank (4) through a gas conveying pipeline (11); the gas output end of the anaerobic fermentation tank (3) is connected with the gas output end of the gas storage tank (4) through a gas circulation pipeline (12), and a check valve (21) is arranged on the gas circulation pipeline (12) close to the anaerobic fermentation tank (3); a pressure regulating valve (20) is arranged on the gas conveying pipeline (11) and the gas circulation pipeline (12) close to the gas storage tank (4); and a pressure gauge (41) is arranged on the gas storage tank (4).

3. The solid waste resource recycling system according to claim 2, wherein The output end of the first motor (24) is located at the inner center position of the pretreatment homogenizing tank (2) and is provided with a first central stirring assembly (22); and the bottom end of the pretreatment homogenizing tank (2) is provided with a lifting pump (23). The sludge output end of the residual sludge collecting device (1) is connected with the sludge input end of the pretreatment homogenizing tank (2) through a sludge output pipeline (9); and the material output end of the lifting pump (23) is connected with the upper feeding end and the lower feeding end of the anaerobic fermentation tank (3) through a material input pipeline (10).

4. The solid waste resource recycling system according to claim 1, wherein, The separation liquid output end of the solid-liquid separation device (6) is connected with the separation liquid input end of the butterfly valve type reverse osmosis device (7) through a separation liquid output pipeline (14); the concentrated liquid output end of the butterfly valve type reverse osmosis device (7) is connected with a reverse osmosis concentrated liquid output pipeline (16), and a reverse osmosis concentrated liquid return pipeline (18) is connected between the concentrated liquid output end of the butterfly valve type reverse osmosis device (7) and the feed end of the solid-liquid separation device (6).

5. The solid waste resource recycling system according to claim 4, wherein The clear liquid output end of the butterfly valve type reverse osmosis device (7) is connected with the clear liquid input end of the earthworm breeding area (8) through a reverse osmosis clear liquid output pipeline (17); the separated residue output end of the solid-liquid separation device (6) is connected with the separated residue input end of the earthworm breeding area (8) through a separated residue output pipeline (15).

6. A process for a solid waste resource recycling system, characterized by, The method comprises the following steps: S1, the sludge collected in the residual sludge collecting device (1) is mixed with livestock and poultry manure and biomass in a certain proportion, and then is sent into the pretreatment homogenizing tank (2) through the sludge output pipeline (9); then the first motor (24) drives the first central stirring assembly (22) to rotate, so as to automatically stir the material, so that the material is fully crushed and mixed, and the material pretreatment is realized; S2, the pretreated material enters the anaerobic fermentation tank (3) from the upper and lower feeding ends of the material input pipeline (10) through the lifting pump (23), and the second motor (33) drives the second central stirring assembly (34) to rotate, so as to automatically stir the material; the sinking material forms a micro-uplift area through the central selection separation cone cylinder (36), the flow rate at the bottom thereof is increased to 0.1-1.3 mm / s, the suspended solids with large particle size are separated and settled, and the suspended solids with large particle size enter the sedimentation bucket (38); in the uplift material, the gas phase and the liquid phase are separated into solid, liquid and gas phases in the three-phase separator (32); then the pipeline circulating pump (19) is started, the liquid is returned to the bottom of the anaerobic fermentation tank (3) from the overflow weir (35) through the liquid internal circulation pipeline (31); the gas enters the gas storage tank (4) through the gas conveying pipeline (11) connected with the three-phase separator (32); when the check valve (21) is in the open state, part of the gas in the gas storage tank (4) is returned to the bottom of the anaerobic fermentation tank (3) through the gas circulation pipeline (12), so as to form a circulating gas-liquid; the circulating gas-liquid passes through the peripheral return mixing component (37), the flow rate at the bottom thereof is increased to 2.7-3.6 mm / s, and the gas-liquid internal circulation stirring is performed, so that the anaerobic fermentation is realized; S3, a reasonable amount of water is stored in the gas storage tank (4), the gas inlet pipe of the gas output end of the gas storage tank (4) is inserted into the stored water, and the gas outlet pipe of the gas output end of the gas storage tank (4) is reserved above the water surface; the gas is pressed into the stored water by using the pressure difference, and then escapes from the water, and is discharged through the gas circulation pipeline (12); the discharged biogas is connected to the generator set (5) to produce biogas power generation; S4, the material after anaerobic fermentation is transported to the solid-liquid separation device (6) through the material output pipeline (13), so that the solid-liquid separation is realized; the separated liquid is discharged through the separation liquid output pipeline (14), and the separated residue is discharged through the separated residue output pipeline (15). S5, the separated liquid output pipeline (14) discharged into the butterfly pipe reverse osmosis device (7), in the butterfly pipe reverse osmosis device (7) is treated again after the concentrated liquid, so that the clear liquid is discharged through the reverse osmosis clear liquid output pipeline (17), the concentrated liquid is discharged through the reverse osmosis concentrated liquid output pipeline (16) and part is used for fertilizer processing, another part is returned to the solid-liquid separation device (6) through the reverse osmosis concentrated liquid return pipeline (18) and is treated again by solid-liquid separation; S6, the separated residue output pipeline (15) discharged into the earthworm breeding area (8), the clear liquid discharged through the reverse osmosis clear liquid output pipeline (17) is used for irrigation of the earthworm breeding area (8).

7. The process of the solid waste recycling and cyclic utilization system according to claim 6, characterized in that, In the S2 step, the liquid inner circulation pipeline (31) and the gas circulation pipeline (12) are arranged at intervals, and the interval angle is 60°; the peripheral reflux mixing component (37) is provided with three, and the angle is distributed at 120°; the inclination angle of the sedimentation hopper (38) is 45°-60°.

8. The process of the solid waste recycling and cyclic utilization system according to claim 6, characterized in that, In the S2 step, the distance between the top edge of the peripheral reflux mixing component (37) and the inner side wall of the anaerobic fermentation tank (3) is 10 times the distance between the bottom edge of the peripheral reflux mixing component (37) and the inner side wall of the anaerobic fermentation tank (3); the top diameter of the central selection separation cone (36) is 2-6 times the bottom diameter. In the S2 step, the distance between the top edge of the peripheral reflux mixing component (37) and the inner side wall of the anaerobic fermentation tank (3) is 10 times the distance between the bottom edge of the peripheral reflux mixing component (37) and the inner side wall of the anaerobic fermentation tank (3); the top diameter of the central selection separation cone (36) is 2-6 times the bottom diameter.

Images