Biological enhancement sewage treatment device based on iron-based magnetic biochar carrier

Abstract

The invention discloses a biological enhancement sewage treatment device based on an iron-based magnetic biological carbon carrier, and aims to overcome the defect that a flocculating agent is difficult to reuse in the existing sewage treatment process. The device comprises a regulating tank, an anaerobic tank, an aerobic tank, a secondary sedimentation tank, a dosing device and a cyclone, the cyclone is used for separating sludge from an iron-based magnetic carbon carrier, and a magnetic field is arranged outside the cyclone to improve the separation efficiency of the iron-based magnetic carbon carrier; wherein the regulating tank, the anaerobic tank, the aerobic tank and the secondary sedimentation tank are sequentially communicated, an iron-based magnetic carbon carrier obtained by separation of the cyclone is delivered into the aerobic tank, and the iron-based magnetic carbon carrier is simultaneously used as a flocculating agent and a strain carrier. The iron-based magnetic carbon carrier is used as a flocculating agent and a strain carrier at the same time, so that the input of materials is reduced, and the iron-based magnetic carbon carrier is recycled by combining a cyclone with magnetism.

Description

Technical Field

[0001] The invention relates to the field of sewage treatment, and more specifically, to a biologically enhanced sewage treatment device based on an iron-based magnetic biological carbon carrier. Background Art

[0002] In the sewage treatment process, biological treatment is highly dependent. The biodegradability of sewage is improved through conditioning. By providing microorganisms with oxygen-rich, anaerobic and anaerobic environments, the biological activities of various microbial populations under different oxygen contents are utilized to fix free nitrogen, phosphorus and other elements to form sludge. The precipitation of solidified sludge is accelerated by flocculants, thereby separating the sludge from the water body. This process is the general sewage treatment process.

[0003] In order to reduce the residence time of water flow and speed up flocculation, magnetic flocculants are used with relevant technology to make suspended matter adsorb and flocculate with magnetic flocculants to form larger flocs. As the coagulation time increases, the flocs gradually increase and settle to the bottom of the sewage, thereby achieving the removal of suspended matter. The reason why magnetic flocculants settle faster than general flocculants is that magnetic flocculants have a higher specific gravity and can be separated from the clear liquid faster with the help of magnetic separation devices.

[0004] At the same time, it also has a moving-bed biofilm reactor (MBBR). The MBBR process places a carrier unit with a large specific surface area in the tank body. The carrier unit moves freely with the water flow in the reactor through aeration or mechanical stirring. The colony will grow in the carrier unit. In a mature carrier unit, the surface colonies include anaerobic bacteria, facultative aerobic bacteria and aerobic bacteria from the inside to the outside. As the colony consumes oxygen, the oxygen content reaching the inner layer during the molecular movement continues to decrease, thereby achieving efficient sewage treatment capacity in a tank body.

[0005] In the existing sewage treatment process, the flocculant and the carrier unit are separated, and the flocculant is difficult to reuse. Summary of the invention

[0006] The invention overcomes the shortcoming that flocculants are difficult to reuse in the existing sewage treatment process, and provides a sewage treatment device based on composite powder magnetic biocarbon loading, which can accelerate sewage treatment efficiency and realize the reuse of flocculants.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A bio-enhanced sewage treatment device based on an iron-based magnetic bio-carbon carrier, comprising: A regulating tank, wherein the regulating tank filters the sewage and adjusts the pH value; An anaerobic tank, wherein the anaerobic tank provides an anaerobic environment and an anaerobic bacteria sludge mass is arranged in the anaerobic tank; an aerobic tank, wherein an aeration device is provided at the bottom of the aerobic tank, and the aeration device provides air and generates an upflow through the air to form a moving bed biofilm reactor; Secondary sedimentation tank, used for mud and water separation; A dosing device, which adds acid and alkali solution to the regulating tank, and adds carbon source and iron-based magnetic carbon carrier to the anaerobic tank; A cyclone, wherein the cyclone separates the sludge and the iron-based magnetic carbon carrier, and a magnetic force regulating structure is provided outside the cyclone, and the magnetic force regulating structure generates a magnetic field to improve the separation efficiency of the iron-based magnetic carbon carrier; Preferably, the cyclone includes a cyclone tube, a feed pipe, and an overflow pipe. The cyclone tube includes an upper cylindrical tube and a lower conical barrel. The bottom of the conical barrel is provided with an underflow port. The inner wall of the conical barrel near the underflow port is embedded with a plurality of convex strips, and the convex strips are arranged in the height direction. The cyclone rubs the iron-based magnetic carbon carrier through the convex strips at the bottom, thereby peeling off part of the fixed aerobic layer bacterial film of the iron-based magnetic carbon carrier, controlling the size of the iron-based magnetic carbon carrier, maintaining its flocculation function, and maintaining the ratio of anaerobic, facultative, and aerobic bacteria.

[0008] Preferably, part of the sludge obtained by cyclone separation is sent to the anaerobic tank through a sludge pump. The anaerobic tank is supplemented with anaerobic bacteria through the structure, and the sewage treatment efficiency is improved by the sludge method.

[0009] Preferably, the magnetic force regulating structure comprises an excitation device arranged on the periphery of the cone barrel. The magnetic field intensity generated by the excitation device is greater than that of the permanent magnet, and can be switched on and off and the intensity can be adjusted.

[0010] Preferably, there are several excitation devices, which are arranged at equal intervals around the cone barrel to generate a uniform magnetic field.

[0011] Preferably, the cross section of the convex strip is provided with an embedding portion and a protruding portion for installation in the cone barrel, the edge of the protruding portion is an asymmetric arc, and the curvature of the upstream portion is smaller than that of the downstream portion. The shape of the convex strip can reduce the total resistance of the swirl flow and reduce energy consumption.

[0012] Preferably, the excitation device is connected to the convex strip, and the excitation device can magnetize the convex strip. The convex strip is made magnetic by the device, and the convex strip is used to adsorb the iron-based magnetic carbon carrier, and then the attached iron-based magnetic carbon carrier rubs and collides with the iron-based magnetic carbon carrier moving in a spiral along the mixed flow to peel off part of the bacterial layer.

[0013] Preferably, the overflow tube is provided with a propeller blade outside, and the propeller blade is fixedly connected to the tube wall of the overflow tube. The rotation direction of the propeller blade is consistent with the rotation direction of the material in the separation device, and the spiral angle of the propeller blade points to the top of the cyclone tube. The structure is used to reduce energy dissipation. Specifically, there is a short-circuit flow that does not participate in the external cyclone and the internal cyclone near the top of the cyclone tube. The short-circuit flow flows along the side wall, top cover and overflow tube of the cylindrical tube, and finally merges with the internal cyclone and is discharged from the overflow port of the overflow tube. The present application makes improvements on this, and a propeller blade fixedly connected to the outer wall of the overflow tube is provided. When the mixed flow enters the cyclone tube, the cyclone directions of the mixed flow are in the same direction at all places, and the liquid in the propeller blade also rotates synchronously to form a spiral flow. Under the influence of the shape of the propeller blade, the liquid in the propeller blade moves upward, which is opposite to the flow direction of the liquid in the short-circuit flow, thereby interrupting the short-circuit flow, reducing energy dissipation, and reducing the amount of unseparated materials.

[0014] The regulating tank, the anaerobic tank and the secondary sedimentation tank are connected in sequence, and the iron-based magnetic carbon carrier obtained by cyclone separation is delivered to the aerobic tank, and the iron-based magnetic carbon carrier serves as a flocculant and a bacterial carrier at the same time.

[0015] The iron-based magnetic carbon carrier is a composite of iron and activated carbon. The iron has magnetism, the carbon material is porous and positively charged, has a good specific surface area and strong affinity with the flocs, and can be used as a nucleating agent for granular sludge.

[0016] The equalization tank physically filters the sewage, screens out larger debris, and adjusts the pH value by adding acid and alkali, thereby improving the biological activity of subsequent biological treatment.

[0017] The anaerobic tank removes nitrogen, ammonifies the difficult-to-treat organic matter, converts it into nitrate through the aerobic tank, and then denitrifies it to produce nitrogen gas.

[0018] The iron-based magnetic carbon carrier delivered in the anaerobic pool can act as sclerotia to attract bacterial flocs and form a film on its surface. Then it flows into the aerobic pool with the water flow. The surface of the iron-based magnetic carbon carrier already has anaerobic bacteria as the inner layer, and aerobic bacteria are fixed on the outer surface. At this time, the surface of the iron-based magnetic carbon carrier has aerobic bacteria, facultative anaerobic bacteria and anaerobic bacteria at the same time, which can make full use of the space. In the floating bed environment, various strains can be efficiently biochemically processed, improving the sewage treatment efficiency, and can avoid the return pipe, and use the nitrification product as raw material for denitrification nearby.

[0019] In addition to being a carrier, the magnetic carbon carriers can form large flocs by themselves, and move through the floating bed environment in the aerobic pool to avoid accumulation at the bottom. In this state, most of the sludge in the aerobic pool is collected by the iron-based magnetic carbon carrier, and the boundary between clean water and sludge is more obvious.

[0020] When entering the secondary sedimentation tank, the aeration environment is lost, and the heavier floccules quickly settle and separate from the clean water. This structure can reduce the flocculent time, reduce the residence time of the water flow, and improve the sewage treatment efficiency.

[0021] The sediment then enters the cyclone for separation, and the sludge and the iron-based magnetic carbon carrier are separated. The iron-based magnetic carbon carrier is put into the aerobic tank again. At this time, the surface of the iron-based magnetic carbon carrier already has an anaerobic bacteria layer, so it does not need to be put into the anaerobic tank again. Part of the sludge is put into the anaerobic tank to replenish the number of anaerobic bacteria, and the other part is discharged for squeeze drying.

[0022] Through the above structure, the sewage treatment device can reuse the iron-based magnetic carbon carrier, so that it can assume the functions of bacterial carrier and flocculant, and realize the reuse of flocculant. The reuse of flocculant depends on its magnetism, and through the magnetic field, the degree of separation from sludge is improved, so that it can be distinguished by the cyclone.

[0023] Preferably, a magnetizing device is also included, and the magnetizing device re-magnetizes the separated iron-based magnetic carbon carrier. The magnetism of the iron-based magnetic carbon carrier is improved by the structure, and the magnetism is improved in the aerobic tank, so that the iron-based magnetic carbon carrier can attract each other to form a larger flocculent body, and can fully interact with the magnetic field in the subsequent cyclone to improve the degree of separation from the sludge.

[0024] Compared with the prior art, the present invention has the following beneficial effects: (1) The iron-based magnetic carbon carrier is used as both a flocculant and a bacterial carrier, which reduces the input of materials and realizes the recovery of the iron-based magnetic carbon carrier through a cyclone combined with magnetism; (2) Through aeration in the aerobic tank, the iron-based magnetic carbon carrier has the function of MBBR, and flocculation is carried out during the sludge production process, which reduces the water retention time in the secondary sedimentation tank, improves the water treatment capacity, and reduces the volume requirement of the secondary sedimentation tank; (3) The cyclone has the ability to strip off the iron-based magnetic carbon carrier, which can maintain the balance of the proportion of anaerobic bacteria, facultative aerobic bacteria and aerobic bacteria, and improve the stability of sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of a cyclone of the present invention; Figure 2 is a schematic diagram of an overflow pipe of the present invention; Figure 3 It is a schematic diagram of the convex strip of the present invention; Figure 4 It is a schematic diagram of the arrangement of the convex strips and the excitation device of the present invention; Figure 5 is a schematic diagram of the device of the present invention; In the figure: Cyclone tube 1, cylindrical tube 2, cone barrel 3, feeding pipe 4, overflow pipe 5, propeller blade 6, regulating wing 7, excitation device 8, bottom flow port 9, convex strip 10, protruding part 11, embedded part 12, external vortex 13, internal vortex 14, short-circuit flow 15. DETAILED DESCRIPTION

[0026] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0027] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present disclosure, and do not specifically refer to any part or element in the present disclosure and should not be understood as limitations on the present disclosure.

[0030] In the present disclosure, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present disclosure can be determined according to specific circumstances, and they cannot be understood as limitations on the present disclosure.

[0031] Example: A bio-enhanced sewage treatment device based on an iron-based magnetic bio-carbon carrier, wherein the iron-based magnetic carbon carrier is a composite of activated carbon and iron, which has both magnetism and a high specific surface area of ​​activated carbon and is positively charged, so that it can act as a flocculant to attract bacterial flocs, and can also use its magnetism to separate it from sludge clumps, thereby achieving reuse.

[0032] Ginseng Figure 1 As shown, the sewage treatment device includes: A regulating tank, wherein the regulating tank filters the sewage and adjusts the pH value; An anaerobic tank, wherein the anaerobic tank provides an anaerobic environment and an anaerobic bacteria sludge mass is arranged in the anaerobic tank; An aerobic tank, wherein an aeration device is provided at the bottom of the aerobic tank, and the aeration device provides air and generates an upflow through the air to form a moving bed biofilm reactor. The aerobic tank and the anaerobic tank constitute an AO structure, which can perform nitrogen and phosphorus removal; Secondary sedimentation tank, i.e. secondary sedimentation tank, is used for mud and water separation; A dosing device, which adds acid and alkali solution to the regulating tank, and adds carbon source and iron-based magnetic carbon carrier to the anaerobic tank, wherein the iron-based magnetic carbon carrier is brand new and non-reusable, and is replenished according to the reduction of the iron-based magnetic carbon carrier; Ginseng Figure 2 As shown, a cyclone is used to separate sludge and iron-based magnetic carbon carriers. A magnetic force regulating structure is provided outside the cyclone, and the magnetic force regulating structure generates a magnetic field to improve the separation efficiency of the iron-based magnetic carbon carriers. The cyclone includes a cyclone cylinder 1, a feed pipe 4, and an overflow pipe 5. The feed pipe 4 is connected to the cyclone cylinder 1 along the tangent of the cylindrical cylinder 2, and the cross section of the feed pipe 4 is rectangular.

[0033] The cyclone includes a cyclone tube 1, a feed pipe 4, and an overflow pipe 5. The cyclone tube 1 includes an upper cylindrical tube 2 and a lower conical barrel 3. The bottom of the conical barrel 3 is provided with a bottom flow port 9. The inner wall of the conical barrel 3 near the bottom flow port 9 is embedded with a plurality of convex strips 10, and the convex strips 10 are arranged along the height direction. The cyclone rubs the iron-based magnetic carbon carrier through the convex strips 10 at the bottom, thereby peeling off part of the fixed aerobic layer bacterial film of the iron-based magnetic carbon carrier, controlling the size of the iron-based magnetic carbon carrier, maintaining its flocculation function, and maintaining the ratio of anaerobes, facultative bacteria, and aerobic bacteria. The height direction refers to that the convex strips 10 are parallel to the central axis of the cyclone tube.

[0034] Part of the sludge obtained by cyclone separation is sent to the anaerobic tank through the sludge pump. The anaerobic tank is supplemented with anaerobic bacteria through the structure, and the sewage treatment efficiency is improved by the sludge method.

[0035] The magnetic force adjustment structure includes an excitation device 8 arranged on the periphery of the cone barrel 3. The magnetic field strength generated by the excitation device 8 is greater than that of the permanent magnet, and can be switched on and off and the strength can be adjusted.

[0036] There are several excitation devices 8, which are arranged at equal intervals around the cone barrel 3. A uniform magnetic field is generated by the devices.

[0037] Ginseng Figure 4As shown, the cross section of the convex strip 10 is provided with an embedding portion 12 and a protruding portion 11 for installation in the cone barrel 3. The edge of the protruding portion 11 is an asymmetric arc, and the curvature of the upstream portion is smaller than that of the downstream portion. The shape of the convex strip 10 can reduce the total resistance of the swirl flow and reduce energy consumption.

[0038] Since the magnetic carrier carries both the function of bacterial strain and flocculant, the magnetic carrier not only aggregates with other magnetic carriers, but also includes sludge particles that are easily separated during flocculation, and fixed sludge growing on the surface of the magnetic carrier from the outside to the inside. The surface of the magnetic carrier has a porous structure to increase its surface area. The bacterial colony structure growing on the magnetic carrier fills the surface of the magnetic carrier, with aerobic colonies growing on the outermost layer, facultative anoxic colonies living in the middle layer, and anaerobic colonies growing in the inner layer. With the recycling of the magnetic carrier, its bacterial layer will continue to thicken, which will cause the proportion of aerobic bacteria to decrease due to the reduction of the proportion of its outermost surface area, the disappearance of facultative anoxic colonies that cannot obtain oxygen and die in the middle layer, and the growth of anaerobic bacteria. This will cause an imbalance of aerobic, facultative anoxic, and anaerobic bacteria, and will also affect the effectiveness of aeration during sewage treatment.

[0039] The excitation device 8 is connected to the convex strip 10, and the excitation device 8 can magnetize the convex strip 10. The convex strip 10 is made magnetic by the device, and the convex strip 10 is used to adsorb the iron-based magnetic carbon carrier, and then the attached iron-based magnetic carbon carrier rubs and collides with the iron-based magnetic carbon carrier moving in a spiral with the mixed flow to peel off part of the bacterial layer.

[0040] Ginseng Figure 5 As shown, in some embodiments, each excitation device 8 is alternately divided into N excitation groups, and the excitation groups are energized alternately. The structure is used to prevent magnetic carriers from being adsorbed and accumulated.

[0041] Ginseng Figure 3As shown, the overflow pipe 5 is provided with a propeller blade 6 outside, and the propeller blade 6 is fixedly connected to the tube wall of the overflow pipe 5. The rotation direction of the propeller blade 6 is consistent with the rotation direction of the material in the separation device, and the spiral angle of the propeller blade 6 points to the top of the cyclone tube 1. The structure is used to reduce energy dissipation. Specifically, there is a short-circuit flow 15 that does not participate in the external cyclone 13 and the internal cyclone 14 near the top of the cyclone tube 1. The short-circuit flow 15 flows along the side wall of the cylindrical tube 2, the top cover and the overflow pipe 5, and finally merges with the internal cyclone 14 and is discharged from the overflow port of the overflow pipe 5. The present application makes an improvement on this, and provides a propeller blade 6 fixedly connected to the outer wall of the overflow pipe 5. When the mixed flow enters the cyclone barrel 1, the cyclone directions of the mixed flow are in the same direction at all places, and the liquid in the propeller blades 6 also rotates synchronously to form a spiral flow. Under the influence of the shape of the propeller blades 6, the liquid in the propeller blades 6 moves upward, which is opposite to the flow direction of the liquid in the short-circuit flow 15, thereby interrupting the short-circuit flow 15, reducing energy dissipation and reducing the amount of unseparated materials.

[0042] In some embodiments, the edge of the propeller blade 6 is provided with an adjustment wing 7, and the adjustment wing 7 is made of a flexible material, and the adjustment wing 7 is tilted upward without being acted upon by an external force. This structure is to further reduce energy consumption on the basis of the aforementioned propeller blade 6. The propeller blade 6 arranged outside the aforementioned overflow pipe 5 makes the mixed flow move upward, opposite to the flow direction of the short-circuit flow 15, so that the two offset each other and destroy the circulation formation of the short-circuit flow 15. This requires the flow velocity of the mixed flow, the shape of the cyclone 1, the feed viscosity of the mixed flow, the shape of the propeller blade 6, etc. to match, so as to achieve a just symmetrical effect. If the pressure generated by the short-circuit flow 15 is greater than the lift generated by the propeller blade 6, the short-circuit flow 15 will be weakened but still exist; otherwise, it will cause a waste of the kinetic energy of the mixed flow. This requires the targeted manufacture of the overflow pipe 5 with the propeller blade 6, which will increase the cost. Therefore, this embodiment provides a flexible adjustment wing 7 installed on the edge of the propeller blade 6.

[0043] In some embodiments, the regulating wing 7 is installed on the end of the propeller blade 6 by secondary molding. In this embodiment, the end of the propeller blade 6 is provided with a socket for accessing the root of the regulating wing 7 .

[0044] The regulating tank, the anaerobic tank and the secondary sedimentation tank are connected in sequence, and the iron-based magnetic carbon carrier obtained by cyclone separation is delivered to the aerobic tank, and the iron-based magnetic carbon carrier serves as a flocculant and a bacterial carrier at the same time.

[0045] The invention also includes a magnetizing device, which re-magnetizes the separated iron-based magnetic carbon carrier. The magnetism of the iron-based magnetic carbon carrier is improved by the structure, and the magnetism is improved in the aerobic tank, so that the iron-based magnetic carbon carrier can attract each other to form a larger flocculent body, and can fully interact with the magnetic field in the subsequent cyclone to improve the separation degree from the sludge.

[0046] The iron-based magnetic carbon carrier has magnetism due to iron, and the carbon material is porous and positively charged, has a good specific surface area and a strong affinity for the bacterial floc, and can be used as a nucleating agent for granular sludge.

[0047] The equalization tank physically filters the sewage, screens out larger debris, and adjusts the pH value by adding acid and alkali, thereby improving the biological activity of subsequent biological treatment.

[0048] The anaerobic tank removes nitrogen, ammonifies the difficult-to-treat organic matter, converts it into nitrate through the aerobic tank, and then denitrifies it to produce nitrogen gas.

[0049] The iron-based magnetic carbon carrier delivered in the anaerobic pool can act as sclerotia to attract bacterial flocs and form a film on its surface. Then it flows into the aerobic pool with the water flow. The surface of the iron-based magnetic carbon carrier already has anaerobic bacteria as the inner layer, and aerobic bacteria are fixed on the outer surface. At this time, the surface of the iron-based magnetic carbon carrier has aerobic bacteria, facultative anaerobic bacteria and anaerobic bacteria at the same time, which can make full use of the space. In the floating bed environment, various strains can be efficiently biochemically processed, improving the sewage treatment efficiency, and can avoid the return pipe, and use the nitrification product as raw material for denitrification nearby.

[0050] In addition to being a carrier, the magnetic carbon carriers can form large flocs by themselves, and move through the floating bed environment in the aerobic pool to avoid accumulation at the bottom. In this state, most of the sludge in the aerobic pool is collected by the iron-based magnetic carbon carrier, and the boundary between clean water and sludge is more obvious.

[0051] When entering the secondary sedimentation tank, the aeration environment is lost, and the heavier floccules quickly settle and separate from the clean water. This structure can reduce the flocculent time, reduce the residence time of the water flow, and improve the sewage treatment efficiency.

[0052] The sediment then enters the cyclone for separation, and the sludge and the iron-based magnetic carbon carrier are separated. The iron-based magnetic carbon carrier is put into the aerobic tank again. At this time, the surface of the iron-based magnetic carbon carrier already has an anaerobic bacteria layer, so it does not need to be put into the anaerobic tank again. Part of the sludge is put into the anaerobic tank to replenish the number of anaerobic bacteria, and the other part is discharged for squeeze drying.

[0053] Through the above structure, the sewage treatment device can reuse the iron-based magnetic carbon carrier, so that it can assume the functions of bacterial carrier and flocculant, and realize the reuse of flocculant. The reuse of flocculant depends on its magnetism, and through the magnetic field, the degree of separation from sludge is improved, so that it can be distinguished by the cyclone.

[0054] The embodiments described above are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A bio-enhanced sewage treatment device based on an iron-based magnetic bio-carbon carrier, characterized in that: include: A regulating tank, wherein the regulating tank filters the sewage and adjusts the pH value; An anaerobic tank, wherein the anaerobic tank provides an anaerobic environment and an anaerobic bacteria sludge mass is arranged in the anaerobic tank; an aerobic tank, wherein an aeration device is provided at the bottom of the aerobic tank, and the aeration device provides air and generates an upflow through the air to form a moving bed biofilm reactor; Secondary sedimentation tank, used for mud and water separation; A dosing device, which adds acid and alkali solution to the regulating tank, and adds carbon source and iron-based magnetic carbon carrier to the anaerobic tank; and A cyclone, wherein the cyclone separates the sludge and the iron-based magnetic carbon carrier, and a magnetic force regulating structure is provided outside the cyclone, and the magnetic force regulating structure generates a magnetic field to improve the separation efficiency of the iron-based magnetic carbon carrier; Among them, the regulating tank, anaerobic tank, aerobic tank and secondary sedimentation tank are connected in sequence, and the iron-based magnetic carbon carrier obtained by cyclone separation is delivered to the aerobic tank, and the iron-based magnetic carbon carrier serves as a flocculant and a bacterial carrier at the same time.

2. The bio-enhanced sewage treatment device based on an iron-based magnetic bio-carbon carrier according to claim 1 is characterized in that: The invention also comprises a magnetizing device, which re-magnetizes the separated iron-based magnetic carbon carrier.

3. The bio-enhanced sewage treatment device based on an iron-based magnetic bio-carbon carrier according to claim 1 is characterized in that: Part of the sludge obtained from cyclone separation is sent to the anaerobic tank through a sludge pump.

4. The bio-enhanced sewage treatment device based on an iron-based magnetic bio-carbon carrier according to claim 1 is characterized in that: The cyclone includes a cyclone tube, a feed pipe, and an overflow pipe. The cyclone tube includes an upper cylindrical tube and a lower conical barrel. The bottom of the conical barrel is provided with a bottom flow port. The inner wall of the conical barrel near the bottom flow port is embedded with a plurality of convex strips, and the convex strips are arranged along the height direction.

5. The bio-enhanced sewage treatment device based on the iron-based magnetic bio-carbon carrier according to claim 4 is characterized in that: The magnetic force adjustment structure includes an excitation device arranged on the periphery of the cone barrel.

6. The bio-enhanced sewage treatment device based on the iron-based magnetic bio-carbon carrier according to claim 5 is characterized in that: There are several excitation devices, and the excitation devices are arranged at equal intervals around the cone barrel.

7. A bio-enhanced sewage treatment device based on an iron-based magnetic bio-carbon carrier according to claim 5 or 6, characterized in that: The excitation device is connected to the convex strip, and the excitation device can magnetize the convex strip.

8. The bio-enhanced sewage treatment device based on an iron-based magnetic bio-carbon carrier according to claim 4 is characterized in that: The cross section of the convex strip is provided with an embedding portion and a protruding portion for installation in the conical barrel, the edge of the protruding portion is an asymmetric arc, and the curvature of the upstream portion is smaller than that of the downstream portion.

9. The bio-enhanced sewage treatment device based on an iron-based magnetic bio-carbon carrier according to claim 1 is characterized in that: A propeller blade is arranged outside the overflow pipe, and the propeller blade is fixedly connected to the pipe wall of the overflow pipe. The rotation direction of the propeller blade is consistent with the rotation direction of the material in the separation device, and the spiral angle of the propeller blade points to the top of the cyclone cylinder.

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