Biogas slurry concentration pretreatment method based on unpowered high-speed centrifugal microfilter

Abstract

The invention discloses a biogas slurry concentration pretreatment method based on an unpowered high-speed centrifugal microfilter, and relates to the technical field of biogas engineering waste recycling. According to the pretreatment method for concentrating the biogas slurry by adopting an unpowered high-speed centrifugal microfiltration technology, the treatment efficiency is high, and suspended solids and impurities in the biogas slurry can be effectively removed. The intelligent control system can monitor the equipment running state in real time and automatically adjust running parameters, it is guaranteed that the equipment is in the optimal running state all the time, and the treatment effect and stability are improved. The automation degree is high, manual operation is reduced, and labor intensity is lowered. A man-machine interaction interface is friendly, operation is easy and convenient, and a user can conveniently conduct parameter setting and state monitoring. The technical blank of domestic biogas slurry high-precision pretreatment is filled, the concentration efficiency is remarkably improved, the operation and maintenance cost is reduced, and the pretreatment energy consumption is saved by 60% or above; chemical pollution is avoided, the concentrated solution can be directly used for water flush fertilizer, and the method is suitable for the fields of large-scale biogas engineering and environment-friendly treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of biogas project waste resource utilization, specifically a biogas slurry concentration pretreatment method based on an unpowered high-speed centrifugal microfilter, especially a pretreatment technology for achieving efficient solid-liquid separation of biogas slurry using an unpowered high-speed centrifugal microfilter, and is suitable for efficient removal of suspended matter and membrane concentration pretreatment of anaerobic biogas slurry in livestock and poultry farms. Background Art

[0002] Biogas slurry is the residual liquid after anaerobic fermentation in biogas plants. It is characterized by high suspended solids (SS), high organic matter (COD / BOD), high salt content, high viscosity, and high ammonia nitrogen content. Direct membrane concentration can lead to membrane fouling, scaling, and reduced flux. Traditional pretreatment processes (such as inclined plate sedimentation, ordinary screen filtration, and spiral dehydration) have the following drawbacks: complex process combinations and low filtration precision (usually ≤200 mesh), which cannot effectively intercept micron-sized suspended particles; equipment is prone to clogging, requiring frequent cleaning and high operating energy consumption; and due to low efficiency, it occupies a large space. After pretreatment, the biogas slurry still contains a large amount of colloids and fine particles, resulting in low operating efficiency, severe membrane fouling, and frequent cleaning of subsequent concentration (membrane filtration system) equipment.

[0003] The domestic biogas slurry concentration pretreatment field has yet to see a pretreatment method based on unpowered high-speed centrifugal microfiltration. The core problem is that traditional centrifugal equipment cannot meet the requirements of high speed and high-precision filtration, and lacks adaptive design for the viscous characteristics of biogas slurry. Traditional processes require the addition of flocculants and coagulants, which increases pollution to subsequent concentration equipment, consumes high power and costs high reagents, and affects fertilizer efficiency. Traditional low-speed microfiltration has low filtration efficiency and precision, and poor backwashing effect. Therefore, there is an urgent need for a unpowered, low-energy, and highly efficient pretreatment method that removes suspended solids and inhibits membrane fouling. Summary of the Invention

[0004] The object of the present invention is to provide a biogas slurry concentration pretreatment method based on an unpowered high-speed centrifugal microfiltration machine to solve the problems raised in the above background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: a biogas slurry concentration pretreatment method based on an unpowered high-speed centrifugal microfiltration machine, comprising the following steps:

[0006] S1: Biogas slurry collection: first collect the biogas slurry into the biogas slurry pool;

[0007] S2: Sedimentation: The biogas slurry is transported to the sedimentation tank by water pump 1. After natural sedimentation to remove large particles of impurities, the biogas slurry is transported to the unpowered high-speed microfiltration machine by water pump 2;

[0008] S3: Separation: The biogas slurry flows into the unpowered centrifugal drum of the unpowered high-speed microfiltration machine and pushes the guide vanes to make the unpowered centrifugal drum rotate rapidly. Under the action of centrifugal force, solid-liquid separation is carried out and suspended matter is intercepted.

[0009] S4: Filtrate collection, the filtrate can flow into the liquid accumulation chamber through the clear liquid outlet and enter the subsequent membrane concentration unit;

[0010] S5: Filter residue collection. After the unpowered centrifugal drum has been running for a period of time, the self-cleaning spray system automatically starts to backwash, so that the filter residue liquid flows into the slag discharge pool through the concentrated residue discharge port and is transported to the composting for utilization.

[0011] Preferably, the SS removal rate of the filtrate in S4 is ≥90%, and the particle size is ≤20 μm.

[0012] Preferably, the turbidity of the biogas slurry in S3 is less than 50 NTU.

[0013] Preferably, the speed range of the unpowered centrifugal drum of the unpowered high-speed microfiltration machine in S3 is 1200-3000 r / min, and the pore size of the filter screen of the unpowered centrifugal drum is 15-200 μm.

[0014] Preferably, the filter mesh of the unpowered centrifugal drum is 600-900 mesh.

[0015] Preferably, the biogas slurry is in the housing of the unpowered high-speed microfiltration machine, the biogas slurry does not submerge the unpowered centrifugal drum, and the distance between the liquid surface and the drum is 100-200 mm.

[0016] Preferably, the unpowered high-speed microfilter includes a shell, an unpowered centrifugal drum, a feed pipe, an intelligent control system, a concentrated slag discharge port, a clear liquid discharge port, a bevel gear, a gear ring, an adjustment component and a self-cleaning spray system. A rotating shaft is connected to one side of the unpowered centrifugal drum, and the unpowered centrifugal drum is rotatably connected to the right side of the shell through the rotating shaft. A feed pipe is provided on the left side of the shell, and an intelligent control system is provided on the side of the shell. A concentrated slag discharge port is connected to the left side of the bottom end of the shell, and a clear liquid discharge port is connected to the right side of the bottom end of the shell. A bevel gear is connected to the rotating shaft of the unpowered centrifugal drum, a gear ring is provided at the upper end of the unpowered centrifugal drum, and the gear ring is meshed with the bevel gear. An adjustment component is connected to the upper end of the gear ring, and a self-cleaning spray system is provided at the upper end of the shell.

[0017] Preferably, the inner wall of the unpowered centrifugal drum is provided with guide blades in a spiral shape, and the biogas slurry outlet is arranged in a vertical direction to the guide blades.

[0018] Preferably, the intelligent control system includes a control box, an intelligent control module, a timing module, a rotation speed sensor, a liquid level sensor and a turbidity sensor.

[0019] Preferably, the timing module controls the backwash time of the self-cleaning spray system to be an interval of 5 minutes to 30 minutes.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention adopts a non-powered high-speed centrifugal microfiltration technology to perform a pretreatment method for concentrating biogas slurry, which has high treatment efficiency and can effectively remove suspended matter and impurities in the biogas slurry. The intelligent control system can monitor the operating status of the equipment in real time and automatically adjust the operating parameters to ensure that the equipment is always in the best operating state, thereby improving the treatment effect and stability. The high degree of automation reduces manual operation and reduces labor intensity. The human-computer interaction interface is friendly and easy to operate, making it convenient for users to set parameters and monitor status. It fills the technical gap of high-precision pretreatment of biogas slurry in China, significantly improves concentration efficiency and reduces operation and maintenance costs, saving more than 60% of pretreatment energy consumption; it avoids chemical pollution, and the concentrated liquid can be directly used for fertilization, which is suitable for large-scale biogas projects and environmental protection management fields.

[0022] The present invention is provided with an adjusting component and a swinging component. The motor can drive the connecting rod to rotate circumferentially through the turntable, so that the connecting rod drives the swing block to swing back and forth through the guide rod, thereby realizing the reciprocating swinging spraying of the high-pressure nozzle at the bottom end of the water pipe, which can increase the spraying range of the water flow and improve the cleaning effect. When the unpowered centrifugal drum rotates, it will drive the ring gear to rotate circumferentially through the bevel gear, so that the three groups of adjusting plates in the rotating frame rotate circumferentially. The shapes of the three groups of adjusting plates are inconsistent. Each group of adjusting plates can guide the sprayed water flow in different directions, so that the water flow can be sprayed at different angles. The sprayed water flow can completely cover the filter screen on the unpowered centrifugal drum, reducing the dead angle of flushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the pretreatment process of the present invention;

[0024] Figure 2 This is a schematic structural diagram of the unpowered high-speed microfiltration machine of the present invention;

[0025] Figure 3 This is a schematic diagram of the enlarged structure of region A of the present invention;

[0026] Figure 4 This is a schematic diagram of the top view of the adjustment assembly of the present invention;

[0027] Figure 5 It is a schematic side view of the structure of the adjustment component of the present invention.

[0028] Figure 6 It is a side view structural diagram of the swing assembly of the present invention;

[0029] Figure 7This is a front view structural diagram of the swing assembly of the present invention;

[0030] Figure 8 This is a schematic diagram of the circuit framework of the intelligent control system of the present invention.

[0031] In the figure: biogas slurry tank 1, water pump 1 2, sedimentation tank 3, water pump 2 4, non-powered high-speed microfiltration machine 5, slag discharge tank 6, liquid accumulation chamber 7, shell 51, non-powered centrifugal drum 52, feed pipe 53, intelligent control system 54, thick slag discharge port 55, clear liquid discharge port 56, bevel gear 57, ring gear 58, adjustment component 59, water pipe 510, motor 511, swing component 512, high-pressure nozzle 513, mounting plate 591, rotating frame 592, adjustment plate 593, guide groove 594, connecting frame 5121, turntable 5122, swing block 5123, guide rod 5124, sliding sleeve 5125, connecting rod 5126. DETAILED DESCRIPTION

[0032] In order to further explain the technical solution of the present invention, specific embodiments are described in detail below.

[0033] The present invention provides a biogas slurry concentration pretreatment method based on an unpowered high-speed centrifugal microfilter, which comprises the following steps: S1: biogas slurry collection, first collecting the biogas slurry into a biogas slurry pool 1; S2: sedimentation, transporting the biogas slurry into a sedimentation pool 3 by a water pump 1, and after natural sedimentation to remove large particles of impurities, transporting the biogas slurry to an unpowered high-speed microfilter 5 by a water pump 2 4; S3: separation, the biogas slurry flows into an unpowered centrifugal drum 52 of the unpowered high-speed microfilter 5, and pushes guide blades to make the unpowered centrifugal drum 52 rotate rapidly, and under the action of centrifugal force, solid-liquid separation is performed, and suspended matter is intercepted; S4: filtrate collection, the filtrate (SS removal rate ≥90%, particle size ≤20 μm) can flow into a liquid accumulation chamber 7 through a clear liquid discharge port 56, and enter a subsequent membrane concentration unit; S5: residue collection, after the unpowered centrifugal drum 52 has been running for a period of time, the self-cleaning spray system is automatically turned on for backwashing, so that the residue liquid flows into a residue discharge pool 6 through a concentrated residue discharge port 55, and is transported to a composting unit for utilization.

[0034] Among them, the turbidity of the biogas slurry in S3 is less than 50NTU.

[0035] The speed range of the unpowered centrifugal drum of the unpowered high-speed microfiltration machine in S3 is 1200-3000 r / min, and the pore size of the filter screen of the unpowered centrifugal drum 52 is 15-200 μm.

[0036] The filter mesh of the unpowered centrifugal drum 52 is 600-900 mesh.

[0037] The biogas slurry is in the housing 51 of the unpowered high-speed microfiltration machine 5 , the biogas slurry does not submerge the unpowered centrifugal drum 52 , and the distance between the liquid surface and the drum is 100-200 mm.

[0038] Example 1

[0039] Treatment object: Take the biogas slurry of a pig farm with SS=4500mg / L and NH3-N=1900mg / L as an example;

[0040] After sedimentation and removal of large particles of impurities, the biogas slurry is transported to the microfiltration machine by a sewage pump. The parameters of the microfiltration machine are: speed 2000r / min, filter mesh number 800 mesh;

[0041] After pre-treatment by the microfiltration machine, the SS of the outlet filtrate dropped to below 340 mg / L, the removal rate of colloidal particles was above 93%, and the pH was stable at 7.5-8;

[0042] Compared with the traditional 200-mesh filter: SS removal rate is increased by 50% and operating energy consumption is reduced by 45%.

[0043] Membrane fouling resistance is reduced by 80%, with the main resistance source being the filter cake layer. The nitrogen, phosphorus and potassium content of the subsequent membrane concentrated liquid meets the liquid fertilizer standards.

[0044] See also Figure 1-Figure 2 The unpowered high-speed microfiltration machine in this embodiment includes a shell 51, an unpowered centrifugal drum 52, a feed pipe 53, an intelligent control system 54, a concentrated slag discharge port 55, a clear liquid discharge port 56, a bevel gear 57, a ring gear 58, an adjustment component 59 and a self-cleaning spray system. The unpowered centrifugal drum 52 is located at the lower end of the shell 51, and a filter is provided on the surface of the unpowered centrifugal drum 52. A rotating shaft is connected to one side of the unpowered centrifugal drum 52, and the unpowered centrifugal drum 52 is rotatably connected to the right side of the shell 51 through the rotating shaft. A feed pipe 53 is provided on the left side of the shell 51, and the feed pipe 53 extends into the unpowered centrifugal drum. The inside of the drum 52 is convenient for the entry of biogas slurry. An intelligent control system 54 is provided on the side of the shell 51. The left side of the bottom end of the shell 51 is connected to a thick slag discharge port 55, and the right side of the bottom end of the shell 51 is connected to a clear liquid discharge port 56. A bevel gear 57 is connected to the rotating shaft of the unpowered centrifugal drum 52. A ring gear 58 is provided at the upper end of the unpowered centrifugal drum 52, and the ring gear 58 is engaged with the bevel gear 57 to achieve synchronous rotation of the ring gear 58 and the unpowered centrifugal drum 52. An adjusting component 59 is connected to the upper end of the ring gear 58. A self-cleaning spray system is provided at the upper end of the shell 51 to achieve backwashing of the unpowered centrifugal drum 52.

[0045] The inner wall of the unpowered centrifugal drum 52 is spirally provided with guide blades, and the biogas slurry outlet is arranged perpendicular to the guide blades. The water flow can push the guide blades to realize the unpowered rotation of the unpowered centrifugal drum 52.

[0046] See also Figure 3-Figure 5 The unpowered high-speed microfiltration machine in this embodiment includes an adjustment assembly 59 including a mounting plate 591, a rotating frame 592, an adjustment plate 593 and a guide groove 594. The mounting plate 591 is connected to the middle end of the interior of the shell 51. The interior of the mounting plate 591 is rotatably connected to the rotating frame 592 through an annular slide rail. The interior of the rotating frame 592 is integrally connected with the adjustment plate 593. The adjustment plate 593 is provided with a guide groove 594 for guiding the water flow. The bottom end of the rotating frame 592 is fixedly connected to the ring gear 58, so that the rotating frame 592 can rotate synchronously with the ring gear 58.

[0047] Among them, there are three groups of adjustment plates 593, one group is divided into three pieces, the first group of adjustment plates 593 is an inverted V shape, the second group of adjustment plates 593 is tilted to the left, and the third group of adjustment plates 593 is tilted to the right. Each group of adjustment plates 593 can guide the sprayed water flow so that the water flow is sprayed at different angles.

[0048] The middle of the rotating frame 592 is hollowed out, and the space between each adjusting plate 593 is also hollowed out to facilitate the passage of water.

[0049] See also Figure 2 、 Figure 6-Figure 8 The self-cleaning spray system in this embodiment includes a water pipe 510, a motor 511, a swing assembly 512 and a high-pressure nozzle 513. The water pipe 510 is rotatably connected to the upper end of the housing 51 through a bearing, and one end of the water pipe 510 extends out of the housing 51 to be connected to an external water source. The top of the housing 51 is connected to the motor 511. A swing assembly 512 is provided in the middle of the top of the housing 51. The swing assembly 512 is connected to the water pipe 510 to adjust the reciprocating angle of the water pipe 510. Nine high-pressure nozzles 513 are provided at the bottom of the water pipe 510.

[0050] The swing assembly 512 includes a connecting frame 5121, a turntable 5122, a swing block 5123, a guide rod 5124, a sliding sleeve 5125, and a connecting rod 5126. The connecting frame 5121 is connected to the middle of the top of the shell 51. The lower end of the connecting frame 5121 is provided with a turntable 5122. The connecting frame 5121 is rotatably connected to the middle of the water pipe 510, so that the water pipe 510 can rotate within the connecting frame 5121. Two sets of swing blocks 5123 are provided inside the connecting frame 5121, and the swing blocks 5123 are fixed to the water pipe 510. Fixed connection, a guide rod 5124 is inserted between the two groups of swing blocks 5123, and a sliding sleeve 5125 is slidingly sleeved on the guide rod 5124. One side of the connecting rod 5126 is integrally formed on the sliding sleeve 5125, and the other side of the connecting rod 5126 slides with the edge of the turntable 5122, so that the connecting rod 5126 can slide in the turntable 5122 to adapt to the reciprocating swing of the swing block 5123. The output device of the motor 511 passes through the shell 51 and is connected to the turntable 5122 to drive the turntable 5122 to rotate.

[0051] The six groups of high-pressure nozzles 513 on the left and right sides correspond vertically to the adjustment plate 593 , and the three groups of high-pressure nozzles 513 in the middle correspond vertically to the hollowed-out middle portion of the rotating frame 592 .

[0052] Among them, the intelligent control system 54 includes a control box, an intelligent control module, a timing module, a speed sensor, a liquid level sensor and a turbidity sensor. The control box is arranged on the side of the shell 51. The control box has a timing module and an intelligent control module inside. The speed sensor is arranged inside the rotating shaft of the unpowered centrifugal drum 52. The shell 51 is provided with a liquid level sensor and a turbidity sensor. The speed sensor can monitor the speed of the unpowered centrifugal drum 52 in real time, the liquid level sensor can monitor the liquid level inside the shell 51 in real time, and the turbidity sensor can monitor the turbidity value of the water inside the shell 51 in real time. The intelligent control module can compare the speed information provided by the speed sensor with the preset speed threshold. When the speed reaches the threshold, it can cooperate with the timing module to automatically backwash the filter screen to avoid blockage. After the speed information, liquid level information and turbidity information are processed by the intelligent control module, they can be transmitted to the display screen on the control box for display. The control box can preset the spraying time through the timing module. The timing module controls the backwash time of the self-cleaning spray system to an interval of 5 minutes to 30 minutes.

[0053] The specific implementation process is as follows:

[0054] When the biogas slurry enters the unpowered centrifugal drum 52 from the feed pipe 53, the biogas slurry can drive the unpowered centrifugal drum 52 to rotate through the guide vanes inside the unpowered centrifugal drum 52, and the suspended matter inside the biogas slurry can be intercepted by the filter screen on the surface of the unpowered centrifugal drum 52. After the unpowered centrifugal drum 52 has been running for a period of time, a lot of filter residue accumulates inside it. At this time, the speed of the unpowered centrifugal drum 52 slows down. When it slows down to a set threshold, the intelligent control module will automatically turn on the solenoid valve between the motor 511 and the external water source, and time it through the timing module, so that the water source can enter the water pipe 510, and then the filter screen on the surface of the unpowered centrifugal drum 52 is backwashed through the high-pressure nozzle 513 at the bottom of the water pipe 510.

[0055] The motor 511 drives the turntable 5122 to rotate in a circumferential direction, and the turntable 5122 can drive the connecting rod 5126 to rotate synchronously. The connecting rod 5126 slides left and right on the guide rod 5124 through the sliding sleeve 5215, and drives the swing block 5123 to swing back and forth through the guide rod 5124. The swing block 5123 can drive the high-pressure nozzle 513 at the bottom end of the water pipe 510 to swing back and forth within the connecting frame 5121, which can increase the water flow spray range and improve the cleaning effect. In addition, when the unpowered centrifugal drum 52 is rotating, the bevel gear 57 can also drive the ring gear 58 to rotate, so that the rotating frame 592 on the ring gear 58 rotates in a synchronous circumferential direction. 2 will drive the three groups of adjustment plates 593 inside it to rotate circumferentially, and the shapes of the three groups of adjustment plates 593 are inconsistent. The first group of adjustment plates 593 is an inverted V-shape, the second group of adjustment plates 593 is tilted to the left, and the third group of adjustment plates 593 is tilted to the right. Each group of adjustment plates 593 can guide the sprayed water flow so that the water flow is sprayed at different angles. The guide groove 594 can guide the water flow on the adjustment plate 593 to enhance the local impact force so that the sprayed water flow can completely cover the filter screen on the unpowered centrifugal drum 52, reducing the flushing dead angle. After the set time is reached, the intelligent control module will synchronously close the solenoid valve of the motor 511 and the external water source to end the backwashing work.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A biogas slurry concentration pretreatment method based on an unpowered high-speed centrifugal microfiltration machine, characterized by: Here are the steps: S1: biogas slurry collection, first collect the biogas slurry into the biogas slurry tank (1); S2: Sedimentation, the biogas slurry is transported to the sedimentation tank (3) by water pump 1 (2), and after the biogas slurry is naturally settled to remove large particles of impurities, it is transported to the non-powered high-speed microfiltration machine (5) by water pump 2 (4); S3: separation, the biogas slurry flows into the unpowered centrifugal drum (52) of the unpowered high-speed microfiltration machine (5), and pushes the guide vanes to make the unpowered centrifugal drum (52) rotate rapidly. Under the action of the centrifugal force, solid-liquid separation is performed and suspended matter is trapped; S4: filtrate collection, the filtrate can flow into the liquid accumulation chamber (7) through the clear liquid outlet (56) and enter the subsequent membrane concentration unit; S5: Filter residue collection. After the unpowered centrifugal drum (52) has been running for a period of time, the self-cleaning spray system is automatically turned on to perform backwashing, so that the filter residue liquid flows into the slag discharge pool (6) through the concentrated residue discharge port (55) and is transported to the composting for utilization.

2. The biogas slurry concentration pretreatment method based on an unpowered high-speed centrifugal microfiltration machine according to claim 1, characterized in that: The SS removal rate of the filtrate in the S4 is ≥90%, and the particle size is ≤20 μm.

3. The biogas slurry concentration pretreatment method based on an unpowered high-speed centrifugal microfiltration machine according to claim 1, characterized in that: The turbidity of the biogas slurry in S3 is less than 50 NTU.

4. The biogas slurry concentration pretreatment method based on an unpowered high-speed centrifugal microfiltration machine according to claim 1, characterized in that: The rotation speed range of the unpowered centrifugal drum (52) of the unpowered high-speed microfiltration machine in S3 is 1200-3000 r / min, and the filter mesh aperture of the unpowered centrifugal drum (52) is 15-200 μm.

5. The biogas slurry concentration pretreatment method based on an unpowered high-speed centrifugal microfiltration machine according to claim 1, characterized in that: The filter mesh of the unpowered centrifugal drum (52) is 600-900 meshes.

6. The biogas slurry concentration pretreatment method based on an unpowered high-speed centrifugal microfiltration machine according to claim 1, characterized in that: The biogas slurry is in the housing (51) of the unpowered high-speed microfilter (5), the biogas slurry does not submerge the unpowered centrifugal drum (52), and the distance between the liquid surface and the drum is 100-200 mm.

7. The biogas slurry concentration pretreatment method based on an unpowered high-speed centrifugal microfiltration machine according to claim 1, characterized in that: The unpowered high-speed microfiltration machine comprises a housing (51), an unpowered centrifugal drum (52), a feed pipe (53), an intelligent control system (54), a concentrated slag outlet (55), a clear liquid outlet (56), a bevel gear (57), a gear ring (58), an adjustment component (59) and a self-cleaning spray system. One side of the unpowered centrifugal drum (52) is connected to a rotating shaft, and the unpowered centrifugal drum (52) is rotatably connected to the right side of the housing (51) through the rotating shaft. A filter screen is provided on the surface of the unpowered centrifugal drum (52). A feed pipe (53) is provided on the left side of the housing (51). 3), an intelligent control system (54) is provided on the side of the shell (51), a concentrated slag discharge port (55) is connected to the left side of the bottom end of the shell (51), a clear liquid discharge port (56) is connected to the right side of the bottom end of the shell (51), a bevel gear (57) is connected to the rotating shaft of the unpowered centrifugal drum (52), a gear ring (58) is provided on the upper end of the unpowered centrifugal drum (52), and the gear ring (58) is meshed with the bevel gear (57), an adjustment component (59) is connected to the upper end of the gear ring (58), and a self-cleaning spray system is provided at the upper end of the interior of the shell (51).

8. The biogas slurry concentration pretreatment method based on an unpowered high-speed centrifugal microfiltration machine according to claim 7, characterized in that: The inner wall of the unpowered centrifugal drum (52) is provided with guide blades in a spiral shape, and the biogas liquid spray outlet is arranged in a vertical direction to the guide blades.

9. The biogas slurry concentration pretreatment method based on an unpowered high-speed centrifugal microfiltration machine according to claim 7, characterized in that: The intelligent control system (54) comprises a control box, an intelligent control module, a timing module, a rotation speed sensor, a liquid level sensor and a turbidity sensor.

10. The biogas slurry concentration pretreatment method based on an unpowered high-speed centrifugal microfiltration machine according to claim 9, characterized in that: The timing module controls the backwash time of the self-cleaning spray system to be an interval of 5 minutes to 30 minutes.

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