Egg-shaped dynamic membrane bioreactor device suitable for anaerobic digestion of sludge and application of egg-shaped dynamic membrane bioreactor device

Abstract

The invention discloses an egg-shaped dynamic membrane bioreactor device suitable for anaerobic digestion of sludge and application, and the egg-shaped dynamic membrane bioreactor device comprises an anaerobic dynamic membrane bioreactor which comprises an upper egg-shaped shell and a lower egg-shaped shell; a membrane water outlet hole, a biogas inlet and a biogas outlet are formed in the top of the upper egg-shaped shell; a pumping sludge outlet, a circulating sludge outlet and a first sampling opening are formed in the side surface of the upper egg-shaped shell; a sludge pumping inlet is formed in the bottom of the lower egg-shaped shell; the lower egg-shaped shell is also provided with a sludge baffle; a circulating sludge inlet and a second sampling opening are formed in the side surface of the lower egg-shaped shell; a membrane frame is integrated in the anaerobic dynamic membrane bioreactor; a dynamic membrane assembly is arranged below the membrane frame; a membrane surface shearing effect is generated on the surface of the flat sheet membrane through the biogas circulating pipeline, sludge entering from the sludge pumping inlet is mixed, and the sludge between the sludge pumping outlet and the sludge pumping inlet is disturbed. Hydraulic conditions of the reactor are optimized, mixed mass transfer of sludge is enhanced, and dynamic membrane pollution is relieved.

Description

Technical Field

[0001] The present invention relates to an anaerobic dynamic membrane bioreactor, and more specifically, to an egg-shaped dynamic membrane bioreactor device suitable for sludge anaerobic digestion and its application. Background Art

[0002] When the anaerobic dynamic membrane bioreactor (AnDMBR) process is applied to sludge anaerobic digestion, the operating concentration can be increased by decoupling the hydraulic retention time and the solid retention time. However, high-concentration sludge is a non-Newtonian fluid with a large viscosity, which is likely to form a stagnant zone that is difficult to flow in the reactor, resulting in sludge deposition and a decline in the performance of the dynamic membrane process. In addition, long-term operation at a high sludge concentration will inevitably make the dynamic membrane too thick, thus requiring frequent cleaning or replacement of the membrane module.

[0003] In a conventional AnDMBR device, the membrane area generally adopts a cylindrical structure, and biogas circulation is used to control membrane fouling, and mass transfer is mixed by pumping sludge circulation. The cylindrical reactor has many deficiencies. Firstly, the overall flow velocity at the lower part of the cylindrical reactor is relatively slow, which is likely to cause sludge deposition at the bottom of the reactor and form a stagnant zone, reducing the effective working volume of the reactor. Secondly, the aspect ratio of the cylindrical reactor is larger, reducing the influence of the circulation generated by pump suction and biogas circulation on the internal flow pattern distribution of the reactor. Summary of the Invention

[0004] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide an egg-shaped dynamic membrane bioreactor device suitable for sludge anaerobic digestion and its application, which can optimize the hydraulic conditions of the reactor, enhance the mass transfer of sludge, relieve membrane fouling, and maintain the long-term stable operation of AnDMBR.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] The first aspect of the present invention provides an egg-shaped dynamic membrane bioreactor device suitable for sludge anaerobic digestion, which is characterized in that it includes an anaerobic dynamic membrane bioreactor;

[0007] The anaerobic dynamic membrane bioreactor is a split egg-shaped structure, including an upper egg-shaped shell and a lower egg-shaped shell adapted thereto;

[0008] The top of the upper egg-shaped shell is provided with a membrane effluent hole, a biogas inlet, and a biogas outlet;

[0009] The side of the upper egg-shaped shell is provided with a pumped sludge outlet, a recycled sludge outlet, and a first sampling port;

[0010] The bottom of the lower egg-shaped shell is provided with a pumped sludge inlet;

[0011] The bottom of the lower egg-shaped shell is provided with a sludge baffle for dispersing the sludge from the pumped sludge inlet. The sludge baffle is fixed directly above the pumped sludge inlet. The sludge baffle includes an upper half and a lower half. The upper half is a first cone, and the lower half is a second cone. The bottoms of the first cone and the second cone together form the sludge baffle;

[0012] The side of the lower egg-shaped shell is provided with a circulating sludge inlet and a second sampling port;

[0013] The anaerobic dynamic membrane bioreactor is internally integrated with a membrane frame;

[0014] The membrane frame is provided with a dynamic membrane module;

[0015] A biogas circulation pipeline is provided below the membrane frame; [[ID=1S]]

[0016] A sludge transport cycle is formed by pumping between the pumped sludge outlet and the pumped sludge inlet;

[0017] The biogas circulation pipeline generates a membrane surface shear effect on the surface of the dynamic membrane module through biogas circulation, mixes the sludge entering from the pumped sludge inlet, and disturbs the sludge between the pumped sludge outlet and the pumped sludge inlet.

[0018] Preferably, the height ratio of the upper egg-shaped shell to the lower egg-shaped shell is 4:6;

[0019] The included angles between the generatrices of the cones of the upper egg-shaped shell and the generatrices of the cones of the lower egg-shaped shell and the horizontal plane are 45°;

[0020] The apex angle of the first cone is 60° - 150°, the base angle of the first cone is 15° - 60°, the apex angle of the second cone is 60° - 150°, and the base angle of the second cone is 15° - 60°.

[0021] Preferably, the ratio of the height of the anaerobic dynamic membrane bioreactor to the maximum inner diameter of the anaerobic dynamic membrane bioreactor is 1.50 - 1.80.

[0022] Preferably, an annular rubber ring is provided on the contact surface between the upper egg-shaped shell and the lower egg-shaped shell;

[0023] A buckle is provided at the connection between the upper egg-shaped shell and the lower egg-shaped shell;

[0024] Preferably, the biogas circulation pipeline includes an intake hose, an aeration main pipe, and an aeration branch pipe;

[0025] There are two main aeration pipes, which are arranged in parallel;

[0026] There are multiple aeration branch pipes, which are successively connected between the two main aeration pipes;

[0027] There are two inlet hoses, one end of each is respectively connected to the corresponding main aeration pipe, and the other end of each is respectively connected to the corresponding biogas inlet.

[0028] Preferably, the dynamic membrane module includes multiple flat membranes;

[0029] The multiple flat membranes are arranged at equal intervals between the two main aeration pipes and are vertically staggered with the aeration branch pipes.

[0030] Preferably, the base material of the flat membrane is made of nylon, polyester or stainless steel wire mesh;

[0031] The flat membrane is communicated with the membrane water outlet hole;

[0032] The main aeration pipe is communicated with the biogas inlet.

[0033] Preferably, a water bath heat preservation coil is arranged outside the anaerobic dynamic membrane bioreactor.

[0034] The second aspect of the present invention provides an application of the egg-shaped dynamic membrane bioreactor device suitable for sludge anaerobic digestion provided in the first aspect of the present invention in sludge anaerobic digestion.

[0035] According to the above invention of the present invention, the egg-shaped dynamic membrane bioreactor device suitable for sludge anaerobic digestion provided by the present invention and its application can effectively reduce the dead zone volume by combining biogas circulation and pumped sludge circulation, achieving a good mixing and mass transfer effect. The present invention improves the hydrodynamics of the reactor, reduces the dead zone volume while alleviating membrane fouling, and ensures the long-term stable operation of AnDMBR. The streamlined structure of the egg-shaped structure adopted by the present invention can more evenly disperse the internal pressure (such as sludge static pressure, biogas pressure), making the stress distribution more uniform, and this structure can also reduce local stress concentration and reduce the risk of structural deformation or rupture, being suitable for long-term operation. In addition, the present invention can optimize the mixing effect and reduce energy consumption. Among them, the egg-shaped geometric structure can improve the disturbance efficiency of pumping and biogas circulation on sludge, combined with sludge baffles that can reduce sludge deposition and enhance sludge dispersion, thereby enhancing the mixing and mass transfer effect, reducing the energy consumption requirements of pumping and biogas circulation, and reducing the operating cost. In addition, the surface area of the egg-shaped structure is smaller than that of a cylinder under the same volume, so the use of materials is reduced, the material cost is reduced, and at the same time, due to mechanical optimization, the requirement for material thickness is reduced. Description of the Drawings

[0036] Figure 1It is a front sectional view schematic diagram of the egg-shaped dynamic membrane bioreactor device of the present invention;

[0037] Figure 2 It is a side sectional view schematic diagram of the egg-shaped dynamic membrane bioreactor device of the present invention;

[0038] Figure 3 It is a top plan view schematic diagram of the egg-shaped dynamic membrane bioreactor device of the present invention;

[0039] Figure 4 It is Figure 1 a sectional view schematic diagram in the A-A direction in;

[0040] Figure 5 It is Figure 4 a schematic diagram of the flat membrane in;

[0041] Figure 6 It is Figure 4 a schematic diagram of the main aeration pipe and the aeration branch pipes in;

[0042] Figure 7 It is Figure 1 a side view and a top view of the sludge baffle in. Specific embodiments

[0043] In order to better understand the above technical solutions of the present invention, the technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0044] Combined with Figures 1 to 3 as shown, an egg-shaped dynamic membrane bioreactor device suitable for sludge anaerobic digestion provided by the present invention includes an anaerobic dynamic membrane bioreactor 100.

[0045] The anaerobic dynamic membrane bioreactor 100 is a separated egg-shaped structure, including an upper egg-shaped shell 101 and a lower egg-shaped shell 102 adapted thereto.

[0046] The top of the upper egg-shaped shell 101 is provided with a membrane water outlet hole 1, a biogas inlet 2 and a biogas outlet 3.

[0047] The membrane water outlet hole 1 is externally connected to a membrane water outlet pipe, the biogas inlet 2 is externally connected to an inlet gas pipe, and the biogas outlet 3 is externally connected to a vacuum pump.

[0048] Two or four pumping sludge outlet holes 4, a circulating sludge outlet 5 and a first sampling port 6 are provided on the side of the upper egg-shaped shell 101.

[0049] The bottom of the lower egg-shaped shell 102 is provided with a pumping sludge inlet 7.

[0050] A circulating sludge inlet 8 and a second sampling port 9 are provided on the side of the lower egg-shaped shell 102.

[0051] The anaerobic dynamic membrane bioreactor 100 is internally integrated with a membrane frame ( Figure 5 ), and a dynamic membrane module is installed on the membrane frame. A biogas circulation pipeline ( Figure 6 ) is provided below the membrane frame.

[0052] A sludge conveying cycle is formed by a pumping method between the pumped sludge outlet 4 and the pumped sludge inlet 7.

[0053] As Figure 6 shown, the biogas circulation pipeline utilizes biogas circulation to form a crossflow rate on the membrane surface, generating a membrane surface shear action to relieve membrane fouling. Combining with the pumped sludge circulation method to disturb the sludge inside the anaerobic dynamic membrane bioreactor 100, achieving a good mixing and mass transfer effect. Using a split egg-shaped structure to optimize the hydraulic conditions, reducing the volume of the dead zone inside the anaerobic dynamic membrane bioreactor 100. The streamlined structure of the egg-shaped structure can more evenly disperse the internal pressure (such as sludge static pressure, biogas pressure), making the stress distribution more uniform. Moreover, this structure can also reduce local stress concentration, reducing the risk of structural deformation or rupture, and is suitable for long-term operation. In addition, the present invention can optimize the mixing effect and reduce energy consumption. The egg-shaped geometric structure can improve the disturbance efficiency of pumping and biogas circulation on the sludge. Combining with sludge baffles that can reduce sludge deposition and enhance sludge dispersion, thereby enhancing the mixing and mass transfer effect, reducing the energy consumption requirements of pumping and biogas circulation, and reducing the operating cost. In addition, the surface area of the egg-shaped structure is smaller than that of a cylinder under the same volume, so the use of materials is reduced, the material cost is reduced, and at the same time, due to mechanical optimization, the requirement for material thickness is reduced..

[0054] The height ratio between the upper egg-shaped shell 101 and the lower egg-shaped shell 102 is 4:6.

[0055] The included angle α between the cone generatrices of the upper egg-shaped shell 101 and the included angle β between the cone generatrix of the lower egg-shaped shell 102 and the horizontal plane are both 45°.

[0056] The ratio of the height of the anaerobic dynamic membrane bioreactor 100 to the maximum inner diameter of the anaerobic dynamic membrane bioreactor 100 is 1.50 - 1.80.

[0057] An annular rubber ring is provided on the contact surface between the upper egg-shaped shell 101 and the lower egg-shaped shell 102 for the sealing of the anaerobic dynamic membrane bioreactor 100.

[0058] A buckle 10 is provided at the connection between the upper egg-shaped shell 101 and the lower egg-shaped shell 102 for the locking of the anaerobic dynamic membrane bioreactor 100.

[0059] Combining Figures 4 to 6 shown, the biogas circulation pipeline includes an intake hose 18, an aeration main pipe 12, and an aeration branch pipe 13.

[0060] There are two main aeration pipes 12, which are arranged in parallel.

[0061] There are multiple aeration branch pipes 13, which are sequentially connected between the two main aeration pipes 12, and multiple aeration holes 14 are opened on the aeration branch pipes 13.

[0062] Vertical inlet pipes 20 are arranged on both of the two main aeration pipes 12, and intake hoses 18 are connected to all the vertical inlet pipes 20. The intake hoses 18 are respectively connected to the corresponding biogas inlets 2.

[0063] The dynamic membrane module includes multiple flat membranes 11, and the base materials of the flat membranes 11 are all made of nylon, polyester or stainless steel wire mesh.

[0064] The multiple flat membranes 11 are sequentially arranged at equal intervals between the two main aeration pipes 12 and form a vertical staggered arrangement with the aeration branch pipes 13.

[0065] A membrane water outlet 19 is arranged on each flat membrane 11, and a membrane water outlet hose is connected to the membrane water outlet 19. All the membrane water outlet hoses are connected to a water collecting pipe 16, and the water collecting pipe 16 is then connected to a membrane water outlet hole 1 through a membrane water outlet main hose 15.

[0066] A water bath heat preservation coil 21 is arranged outside the anaerobic dynamic membrane bioreactor 100 for maintaining the digestion temperature.

[0067] A sludge baffle 22 is further arranged at the bottom of the lower egg-shaped shell 102 for dispersing sludge. The sludge baffle 22 is fixed directly above the pumped sludge inlet 7. As Figure 7 Shown in the side view and top view of the sludge baffle 22, the sludge baffle 22 includes an upper half and a lower half. The upper half is a first cone 22a, and the lower half is a second cone 22b. The bottoms of the first cone 22a and the second cone 22b together form the sludge baffle 22. The apex angle of the first cone 22a is 60° - 150°, and correspondingly, the base angle of the first cone 22a is 15° - 60°; the apex angle of the second cone 22b is 60° - 150°, and correspondingly, the base angle of the second cone 22b is 15° - 60°. The apex angles of the first cone 22a and the second cone 22b can be the same. Or, the apex angle or base angle of the first cone 22a is different from the apex angle or base angle of the second cone 22b. The sludge baffle 22 is arranged above the sludge inlet 7 to disperse the sludge entering from the sludge inlet 7 and the sludge from above the sludge baffle 22. In addition, the upper half of the sludge baffle 22 can prevent sludge from accumulating on the baffle, and the lower half can enable the sludge entering the reactor 100 from the pumped sludge port 7 to disperse better around the reactor 100.

[0068] The egg-shaped dynamic membrane bioreactor device of the present invention is applicable to a conventional sludge anaerobic digestion system. An anaerobic dynamic membrane bioreactor with a split egg-shaped structure is adopted, and a sludge circulation pipeline is established with the main reaction area. The decoupling of HRT (hydraulic retention time) and SRT (solid retention time) is achieved by the solid-liquid separation function of the dynamic membrane module, and the sludge concentration in the reaction system is increased and maintained at 30-60 g / L.

[0069] Example 1

[0070] In this Example 1, the effective volume of the membrane area of the anaerobic dynamic membrane bioreactor 100 is 105 L, and the sludge concentration is 37 g / L. It adopts a split egg-shaped structure, including an upper egg-shaped shell 101 and a lower egg-shaped shell 102 adapted thereto. The height ratio between the upper egg-shaped shell 101 and the lower egg-shaped shell 102 is 4:6. The included angle α between the cone generatrices of the upper egg-shaped shell 101 and the included angle β between the cone generatrix of the lower egg-shaped shell 102 and the horizontal plane are both 45°. The ratio of the height of the anaerobic dynamic membrane bioreactor 100 to the maximum inner diameter of the anaerobic dynamic membrane bioreactor 100 is 1.80. One circulating sludge outlet 5 and one first sampling port 6 are arranged on the side of the upper egg-shaped shell 101. A membrane frame, 8 flat membranes 11 arranged at equal intervals and corresponding biogas circulation pipelines are integrated inside the anaerobic dynamic membrane bioreactor 100. A pumped sludge inlet 7 and a sludge baffle 22 are arranged at the bottom of the lower egg-shaped shell 102, and a circulating sludge inlet 8 and a second sampling port 9 are arranged on the side. Four pumped sludge outlets 4 are arranged on the upper egg-shaped shell 101, the flow rate of a single pumped sludge outlet 4 is 1 L / s, and the total flow rate of the four pumped sludge outlets 2 is 4 L / s. The pumped sludge inlet 7 is arranged at the bottom of the lower egg-shaped shell 102, and a small circular sludge baffle 22 is additionally arranged at the bottom to disperse the sludge. The biogas circulation intensity is 35 m 3 / (m 2 •h). The impact of biogas circulation and pumped sludge is used to form a larger cross-flow rate on the membrane surface, increasing the fluid state disturbance of the whole reactor, forming an obvious sludge upflow. The cross-flow rate on the membrane surface with a larger flow rate and more uniform distribution effectively controls membrane fouling, and at the same time, the improvement of the fluid state achieves a good mass transfer effect.

[0071] Example 2

[0072] The structural settings of this Example 2 are the same as those of Example 1. The sludge concentration in the membrane area is 54 g / L, and the biogas circulation intensity is 35 m 3 / (m 2• h), during the startup phase of the anaerobic dynamic membrane bioreactor 100, the TMP (transmembrane pressure difference) can be basically stably maintained below 5 kPa, and the average TMP is 2.6 ± 0.8 kPa. It is successively increased to 17.4 kPa, 24.4 kPa, and 30.8 kPa on the 73rd, 74th, and 75th days of operation. Subsequently, it enters the operation stage under high transmembrane pressure difference of the dynamic membrane, and can be maintained at about 30 kPa for long-term operation. The average TMP is 29.9 ± 1.0 kPa, and it can operate continuously and stably for more than 100 days without membrane cleaning. From day 0 to day 72, the membrane effluent is a relatively dilute sludge mixture, showing a black and turbid state, and the average SS (suspended solid concentration) is 5.11 ± 1.73 g / L. With the formation of the dynamic membrane and the improvement of the filtration capacity, the SS of the membrane effluent is basically zero on the 75th day of operation, and the turbidity of the membrane effluent is stably below 200 NTU (nephelometric turbidity unit) and remains stable during the subsequent operation period.

[0073] In summary, due to the larger height-diameter ratio of the existing cylindrical reactor, the overall flow velocity at the lower part of the reactor is relatively slow, which easily leads to sludge deposition and the formation of dead zones at the bottom of the reactor. At the same time, the cylindrical configuration reduces the influence of the circulation generated by pump suction and biogas circulation on the internal flow pattern distribution of the reactor. The egg-shaped dynamic membrane bioreactor device suitable for anaerobic sludge digestion in the present invention has better hydraulic conditions in the egg-shaped structure when separated than the cylindrical structure. With the help of biogas circulation and sludge pumping circulation, membrane fouling can be effectively alleviated, and a good mixing and mass transfer effect can be achieved, reducing the volume of dead zones inside the reactor and realizing the stable operation of the reactor. The present invention improves the hydraulic conditions of the reactor, alleviates membrane fouling while reducing the volume of dead zones, and ensures the long-term stable operation of the AnDMBR. The streamlined structure of the egg-shaped structure adopted in the present invention can more evenly disperse the internal pressure (such as sludge static pressure, biogas pressure), making the stress distribution more uniform. Moreover, this structure can also reduce local stress concentration and reduce the risk of structural deformation or rupture, which is suitable for long-term operation. In addition, the present invention can optimize the mixing effect and reduce energy consumption. The egg-shaped geometric structure can improve the disturbance efficiency of pumping and biogas circulation on sludge. Combined with the sludge baffle that can reduce sludge deposition and enhance sludge dispersion, the mixing and mass transfer effect is enhanced, the energy consumption requirements of pumping and biogas circulation are reduced, and the operating cost is lowered. In addition, the surface area of the egg-shaped structure is smaller than that of the cylindrical shape under the same volume, so the use of materials is reduced, the material cost is lowered, and at the same time, due to mechanical optimization, the requirement for material thickness is reduced.

[0074] Those of ordinary skill in the art in this technical field should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. As long as it is within the scope of the substantial spirit of the present invention, changes and modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. An egg-shaped dynamic membrane bioreactor device applicable to anaerobic digestion of sludge, characterized in that: It includes an anaerobic dynamic membrane bioreactor; The anaerobic dynamic membrane bioreactor is a split egg-shaped structure, including an upper egg-shaped shell and a lower egg-shaped shell adapted thereto; The top of the upper egg-shaped shell is provided with a membrane effluent hole, a biogas inlet and a biogas outlet; The side of the upper egg-shaped shell is provided with a pumped sludge outlet, a recycled sludge outlet and a first sampling port; The bottom of the lower egg-shaped shell is provided with a pumped sludge inlet; The bottom of the lower egg-shaped shell is provided with a sludge baffle for dispersing the sludge from the pumped sludge inlet. The sludge baffle is fixed directly above the pumped sludge inlet. The sludge baffle includes an upper half and a lower half. The upper half is a first cone, and the lower half is a second cone. The bottoms of the first cone and the second cone together form the sludge baffle; The side of the lower egg-shaped shell is provided with a recycled sludge inlet and a second sampling port; A membrane frame is integrated inside the anaerobic dynamic membrane bioreactor; Dynamic membrane modules are provided on the membrane frame; A biogas circulation pipeline is provided below the membrane frame; A sludge transport cycle is formed by pumping between the pumped sludge outlet and the pumped sludge inlet; The biogas circulation pipeline generates a membrane surface shear effect on the surface of the dynamic membrane module through biogas circulation, mixes the sludge entering from the pumped sludge inlet, and disturbs the sludge between the pumped sludge outlet and the pumped sludge inlet.

2. The egg-shaped dynamic membrane bioreactor device applicable to anaerobic digestion of sludge according to claim 1, characterized in that: The height ratio of the upper egg-shaped shell to the lower egg-shaped shell is 4:6; The cone generatrix of the upper egg-shaped shell and the cone generatrix of the lower egg-shaped shell form an angle of 45° with the horizontal plane; The apex angle of the first cone is 60° to 150°, and correspondingly, the base angle of the first cone is 15° to 60°; the apex angle of the second cone is 60° to 150°, and correspondingly, the base angle of the second cone is 15° to 60°.

3. The egg-shaped dynamic membrane bioreactor device applicable to anaerobic digestion of sludge according to claim 1, characterized in that: The ratio of the height of the anaerobic dynamic membrane bioreactor to the maximum inner diameter of the anaerobic dynamic membrane bioreactor is 1.50 to 1.

80.

4. The egg-shaped dynamic membrane bioreactor device applicable to anaerobic digestion of sludge according to claim 1, wherein: An annular rubber ring is provided on the contact surface between the upper egg-shaped shell and the lower egg-shaped shell; A buckle is provided at the connection between the upper egg-shaped shell and the lower egg-shaped shell; 5. The egg-shaped dynamic membrane bioreactor device applicable to anaerobic digestion of sludge according to claim 1, characterized in that: The biogas circulation pipeline includes an intake hose, an aeration main pipe and aeration branch pipes; There are two aeration main pipes, arranged in parallel; There are multiple aeration branch pipes, successively connected between the two aeration main pipes; There are two intake hoses, one end of each is respectively connected to the corresponding aeration main pipe, and the other end of each is respectively connected to the corresponding biogas inlet.

6. The egg-shaped dynamic membrane bioreactor device applicable to anaerobic digestion of sludge according to claim 5, characterized in that: The dynamic membrane module includes multiple flat membranes; The multiple flat membranes are arranged at equal intervals between the two aeration main pipes and are vertically staggered with the aeration branch pipes.

7. The egg-shaped dynamic membrane bioreactor device applicable to anaerobic digestion of sludge according to claim 6, wherein: The base material of the flat membrane is made of nylon, polyester or stainless steel wire mesh; The flat membrane is connected to the membrane effluent hole; The aeration main pipe is connected to the biogas inlet; 8. The egg-shaped dynamic membrane bioreactor device applicable to anaerobic digestion of sludge according to claim 1, characterized in that: A water bath heat preservation coil is provided outside the anaerobic dynamic membrane bioreactor.

9. Application of an egg-shaped dynamic membrane bioreactor device suitable for anaerobic digestion of sludge according to any one of claims 1-8 in anaerobic digestion of sludge.

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