An apparatus for mitigating sewage load shocks using biochar

Abstract

The utility model belongs to sewage treatment technical field, especially utilize a kind of device for biological carbon to slow down sewage load impact, it solves the problem of inconvenient replacement maintenance of biological carbon.This utilize the device for biological carbon to slow down sewage load impact, including circular barrel main part, the barrel main part inside coaxial center is provided with annular baffle, the inside of annular baffle forms cylindrical pretreatment pool, outside forms annular adsorption treatment pool, the adsorption treatment pool is truncated by a radial baffle, the radial baffle two sides are equipped with water inlet and water outlet respectively, the sewage in pretreatment pool is input adsorption treatment pool from water inlet, and flow along circumferential direction, finally discharge from water outlet, the water inlet and water outlet between along the flow direction of sewage can detachably be provided with at least two groups of biological carbon adsorption component.The effect that biological carbon adsorption component modularization is realized, and it is convenient to dismount and maintain.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and specifically relates to a device that uses biochar to mitigate the impact of wastewater load. Background Technology

[0002] Biochar, as a porous carbon-rich material, exhibits significant advantages in wastewater adsorption treatment due to its large specific surface area, rich pore structure, and diverse surface functional groups. It can effectively capture and enrich suspended particles, colloidal substances, some dissolved organic matter, and nutrients such as nitrogen and phosphorus in wastewater through various mechanisms such as physical adsorption, ion exchange, and complexation precipitation. This significantly reduces the pollution load and mitigates the impact of fluctuations in water quality and quantity on subsequent biological treatment units.

[0003] Currently, the mainstream methods for applying biochar in wastewater treatment mainly include two types: one is to use it as a fixed packing material in filter beds or equalization tanks to form a biochar adsorption bed; the other is to use it as an additive directly added to activated sludge systems or anaerobic digestion units. Among these, the fixed bed form is more widely used due to its simple structure and low cost, and biochar is usually present in the tank as an integral packing.

[0004] However, this traditional fixed-bed application has several inherent drawbacks. First, the biochar packing layer is usually a monolithic structure, which makes replacement and maintenance extremely difficult when it becomes saturated or clogged by suspended solids in the wastewater. This often requires shutting down the system and emptying the entire tank, causing system interruption and failing to meet the requirements for continuous treatment. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a device that utilizes biochar to mitigate the impact of wastewater load.

[0006] To achieve the innovative objectives of this utility model, the following technical solutions can be used: A device for mitigating wastewater load shocks using biochar includes a circular cylindrical body. An annular baffle is coaxially arranged inside the cylindrical body. A cylindrical pretreatment tank is formed on the inner side of the annular baffle, and an annular adsorption treatment tank is formed on the outer side. The adsorption treatment tank is cut off by a radial baffle. An inlet and an outlet are respectively provided on both sides of the radial baffle. Wastewater in the pretreatment tank is input into the adsorption treatment tank through the inlet and flows in the circumferential direction, and is finally discharged from the outlet. At least two sets of biochar adsorption components are detachably arranged between the inlet and the outlet along the flow direction of the wastewater.

[0007] This invention can be applied to the treatment of rural sewage. A cylindrical main body is divided into inner and outer parts by an annular baffle. The central part is a cylindrical pretreatment tank used to pre-treat the incoming sewage by filtering out larger fixed impurities. The outer part is an annular adsorption treatment tank used for specific adsorption treatment by biochar adsorption components. The two parts are rationally arranged and compactly structured. The biochar adsorption components are expected to achieve an average adsorption capacity of ≥30 mg / g for carbon, nitrogen, and phosphorus in the sewage. A radial baffle separates the adsorption treatment tank, limiting the flow path of the sewage. The pre-treated sewage enters the adsorption treatment tank through the inlet and flows circumferentially under the influence of potential difference. After being treated by the biochar adsorption components, it is discharged through the outlet, ensuring sufficient and uniform contact between the sewage and the biochar adsorption components. Furthermore, this invention modularizes the biochar adsorption components, allowing for multiple sets to ensure adsorption efficiency. The biochar adsorption components are also flexibly removable, laying the foundation for subsequent maintenance and functional expansion. Individual biochar adsorption components can be replaced without stopping system operation.

[0008] In the above-mentioned device for mitigating wastewater load shock using biochar, the pretreatment tank is equipped with a filter assembly at the top and a sedimentation zone at the bottom. The inlet is located between the filter assembly and the sedimentation zone. The pretreatment tank includes a conical bottom, and a discharge outlet is located at the lowest point of the conical bottom.

[0009] The filter components at the top of the pretreatment tank are used to intercept large suspended solids and floating matter in the sewage. The sedimentation zone at the bottom, combined with the conical bottom, facilitates the settling and concentration of heavier particles. The inlet is located in the upper middle position, which can release the supernatant that has been preliminarily purified in the sedimentation zone to the adsorption treatment tank. The sludge outlet facilitates the periodic discharge of settled sludge, thus completing the self-cleaning function of the pretreatment tank.

[0010] In the aforementioned device for mitigating wastewater load shocks using biochar, the biochar adsorption component is fan-shaped, comprising a fan-shaped cylindrical support frame and biochar packing material filled within the support frame.

[0011] The specific shape of the biochar adsorption module is a fan shape that adapts to the annular shape of the adsorption treatment tank. The module consists of a support frame and biochar packing. The packing is encapsulated in the support frame to form an independent and standardized functional unit, which greatly facilitates installation, replacement and transportation.

[0012] In the above-mentioned device for mitigating wastewater load shock using biochar, the radial inner and outer sides of the support frame include arc-shaped plates that are attached to the wall of the adsorption treatment tank; the circumferential ends of the support frame include mesh plates.

[0013] The arc-shaped plate of the support frame fits tightly against the inner and outer walls of the annular pool, thus providing a seal. This forces water flow to pass through the biochar packing material only through the front and rear mesh plates, ensuring that all wastewater must be treated. The mesh plates are the necessary channels for wastewater to come into contact with the packing material, allowing wastewater to pass through without the packing material leaking out.

[0014] In the above-mentioned device for mitigating sewage load shock using biochar, the two ends of the biochar packing near the mesh plate are made of coarse-grained biochar, and the middle part is made of fine-grained biochar. The mesh plate allows sewage to pass through but does not allow coarse-grained biochar to pass through. The top of the support frame is provided with a handle.

[0015] The biochar packing employs a graded filling strategy with coarse particles at both ends and fine particles in the middle. The coarse particle layers at both ends prevent the fine biochar particles in the middle from leaking out of the mesh plate, while also uniformly dispersing the water flow and reducing the risk of clogging. The fine particles in the middle provide a large specific surface area, ensuring adsorption efficiency. A handle is provided for lifting the entire biochar adsorption module, facilitating disassembly, assembly, and maintenance.

[0016] In the above-mentioned device for mitigating wastewater load shock using biochar, radially protruding limiting protrusions are provided on the inner and outer walls of the adsorption treatment tank, and the biochar adsorption component is detachably locked between two adjacent sets of limiting protrusions.

[0017] A slot is formed between two sets of adjacent limiting protrusions. The biochar adsorption component can be detachably locked into the slot like being inserted into a bookshelf, realizing the rapid positioning, fixing and disassembly of the biochar adsorption component without the need for complicated tools or connectors. This is the structural basis for realizing the modular design.

[0018] In the aforementioned device for mitigating wastewater load shocks using biochar, a buffer gap is formed between adjacent biochar adsorption components, and a interception plate can be detachably inserted into the buffer gap to cut off the flow of wastewater.

[0019] The buffer gap serves two purposes: it buffers wastewater and provides a location for the interception plate. The interception plate can physically cut off the annular flow channel. When a component needs to be replaced, the flow channels before and after it can be cut off, allowing for individual maintenance of that component and improving operational flexibility.

[0020] In the above-mentioned device for mitigating wastewater load shock using biochar, the buffer gap is located between two opposing limiting protrusions. The front end of the limiting protrusion is provided with a radially recessed partition slot. The two sides of the intercepting plate can be inserted into the partition slot, and the bottom side of the intercepting plate can abut against the bottom of the adsorption treatment tank.

[0021] The partition slot at the front end of the limiting protrusion provides a precise slot for the interception plate, ensuring convenient and stable installation. The bottom side of the interception plate is sealed against the bottom of the pool to ensure the interception effect.

[0022] In the above-mentioned device for mitigating wastewater load shock using biochar, an inlet buffer is formed between the first biochar adsorption component along the wastewater flow direction and the radial baffle. The inlet is located within the inlet buffer and is located radially inside. An effluent buffer zone is formed between the last biochar adsorption unit along the sewage flow direction and the radial baffle, and the effluent outlet is located within the effluent buffer zone and is located radially outward or at the bottom.

[0023] The inlet buffer zone is located at the starting point of the water flow, which reduces the flow velocity and kinetic energy of the sewage flowing in from the central pool and distributes it evenly across the entire cross-section of the annular flow channel. This avoids a large hydraulic impact on the first biochar adsorption unit. Appropriate buffer and deceleration components can also be installed in the input direction of the inlet to further reduce impact. The effluent buffer zone smoothly collects the treated effluent.

[0024] In the above-mentioned device for mitigating wastewater load shock using biochar, a wastewater input pipe is provided above the cylindrical main body. The wastewater input pipe spans the adsorption treatment tank and its output end extends into the upper part of the pretreatment tank. The wastewater input pipe is located above the influent buffer zone and / or the effluent buffer zone.

[0025] The wastewater inlet pipe is installed overhead, so it does not occupy the core treatment area. Moreover, the wastewater inlet pipe is not above the biochar adsorption components, so it will not affect the disassembly and assembly of the biochar adsorption components.

[0026] Compared with the prior art, the present invention has the following main advantages: 1. This utility model uses an annular partition to divide the cylindrical body into inner and outer parts. The central part is a cylindrical pretreatment tank, which is used to pretreat the input wastewater to be treated by filtering out larger fixed impurities. The outer part is an annular adsorption treatment tank, which is used for specific adsorption treatment by biochar adsorption components. The two parts are reasonably arranged and have a compact structure.

[0027] 2. Radial baffles separate the adsorption treatment tank, limiting the flow path of sewage. The pre-treated sewage enters the adsorption treatment tank from the inlet and flows in the circumferential direction under the action of potential difference. After being treated by the biochar adsorption components, it is discharged from the outlet, ensuring that the sewage has sufficient and uniform contact with the biochar adsorption components.

[0028] 3. This utility model modularizes the biochar adsorption component, and setting multiple sets can ensure the adsorption effect. Moreover, the installation of the biochar adsorption component is flexible and removable, which lays the foundation for subsequent maintenance and functional expansion. Individual biochar adsorption components can be replaced without stopping the system operation.

[0029] 4. The biochar packing adopts a graded filling strategy with coarse particles at both ends and fine particles in the middle. The coarse particle layer at both ends can prevent the fine biochar particles in the middle from being lost from the mesh plate, while also uniformly dispersing the water flow and reducing the risk of clogging; the fine particles in the middle provide a huge specific surface area to ensure adsorption efficiency.

[0030] 5. A slot is formed between two sets of adjacent limiting protrusions. The biochar adsorption component can be detachably locked in the slot like being inserted into a bookshelf, realizing the rapid positioning, fixing and disassembly of the biochar adsorption component.

[0031] 6. The buffer gap can buffer sewage on the one hand, and provide a position for the insertion of the interception plate on the other hand. The interception plate physically cuts off the annular flow channel, improving the flexibility of operation and maintenance.

[0032] 7. The inlet buffer zone is located at the starting point of the water flow, which reduces the flow velocity and kinetic energy of the sewage flowing in from the central pool and distributes it evenly across the entire cross-section of the annular flow channel, avoiding large hydraulic impacts on the first biochar adsorption unit. The effluent buffer zone can smoothly collect the treated effluent. Attached Figure Description

[0033] Figure 1 This is a top view of the overall structure provided by this utility model; Figure 2 yes Figure 1 Schematic diagram of the cross section at point AA; Figure 3 This is a top view of the cylindrical body provided by this utility model; Figure 4 This is a top view of the support frame provided by this utility model.

[0034] In the diagram, the components are: 1. Cylindrical main body; 2. Annular baffle; 3. Pretreatment tank; 4. Adsorption treatment tank; 5. Radial baffle; 6. Inlet; 7. Outlet; 8. Biochar adsorption assembly; 9. Filter assembly; 10. Sedimentation zone; 11. Conical tank bottom; 12. Sewage outlet; 14. Support frame; 15. Biochar packing; 16. Arc-shaped plate; 17. Mesh plate; 18. Coarse biochar; 19. Fine biochar; 20. Handle; 21. Limiting protrusion; 22. Buffer gap; 23. Baffle slot; 24. Inlet buffer zone; 25. Outlet buffer zone. Detailed Implementation

[0035] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0036] Specific implementation examples Figures 1-4 As shown, this device for mitigating wastewater load shock using biochar includes a circular cylindrical body 1. An annular baffle 2 is coaxially arranged inside the cylindrical body 1. A cylindrical pretreatment tank 3 is formed on the inner side of the annular baffle 2, and an annular adsorption treatment tank 4 is formed on the outer side. The adsorption treatment tank 4 is cut off by a radial baffle 5. An inlet 6 and an outlet 7 are respectively provided on both sides of the radial baffle 5. Wastewater in the pretreatment tank 3 is input into the adsorption treatment tank 4 through the inlet 6 and flows in the circumferential direction, and is finally discharged from the outlet 7. Three sets of biochar adsorption components 8 are detachably arranged between the inlet 6 and the outlet 7 along the flow direction of the wastewater.

[0037] Specifically, this invention uses an annular partition 2 to divide the cylindrical main body 1 into inner and outer parts. The central part is a cylindrical pretreatment tank 3, used for pretreatment of the input wastewater to be treated by filtering out larger fixed impurities. The outer part is an annular adsorption treatment tank 4, used for specific adsorption treatment by the biochar adsorption assembly 8. The two parts are rationally arranged and have a compact structure. A radial partition 5 separates the adsorption treatment tank 4, limiting the flow path of the wastewater. The pretreated wastewater enters the adsorption treatment tank 4 from the inlet 6 and flows circumferentially under the action of potential difference. After being treated by the biochar adsorption assembly 8, it is discharged from the outlet 7, ensuring sufficient and uniform contact between the wastewater and the biochar adsorption assembly 8. In addition, this invention modularizes the biochar adsorption assembly 8, and setting multiple sets can ensure the adsorption effect. Moreover, the installation of the biochar adsorption assembly 8 is flexible and removable, laying the foundation for subsequent maintenance and functional expansion. Individual biochar adsorption assemblies 8 can be replaced without stopping the system operation.

[0038] like Figure 1 , 2 As shown, the pretreatment tank 3 is equipped with a filter assembly 9 at the top and a sedimentation zone 10 at the bottom. An inlet 6 is provided between the filter assembly 9 and the sedimentation zone 10. The pretreatment tank 3 includes a conical bottom 11, and a drain outlet 12 is provided at the lowest point of the conical bottom 11.

[0039] Specifically, the filter assembly 9 at the top of the pretreatment tank 3 is used to intercept large suspended solids and floating matter in the sewage. The sedimentation zone 10 at the bottom, together with the conical bottom 11, facilitates the settling and concentration of heavier particles. The inlet 6 is located in the middle and upper position, which can release the supernatant that has been preliminarily purified in the sedimentation zone 10 to the adsorption treatment tank 4. The discharge outlet 12 facilitates the periodic discharge of settled sludge, thus completing the self-cleaning function of the pretreatment tank 3.

[0040] like Figure 1 ,4 As shown, the biochar adsorption assembly 8 is fan-shaped, including a fan-shaped cylindrical support frame 14 and biochar packing 15 filled within the support frame 14. A handle 20 is provided at the top of the support frame 14. The radial inner and outer sides of the support frame 14 include arc-shaped plates 16, which are attached to the wall of the adsorption treatment tank 4. The circumferential ends of the support frame 14 include mesh plates 17. The biochar packing 15 has coarse-grained biochar 18 at both ends near the mesh plates 17 and fine-grained biochar 19 in the middle. The mesh plates 17 allow wastewater to pass through but do not allow coarse-grained biochar to pass through.

[0041] Specifically, the biochar adsorption module 8 is fan-shaped, conforming to the annular shape of the adsorption treatment tank 4. This module consists of a support frame 14 and biochar packing 15. The packing is encapsulated within the support frame 14, forming an independent, standardized functional unit, greatly facilitating installation, replacement, and transportation. The arc-shaped plate 16 of the support frame 14 fits tightly against the inner and outer walls of the annular tank, providing a seal and forcing water flow to pass only through the front and rear mesh plates 17 and biochar packing 15. This ensures that all wastewater is treated. The mesh plates 17 are the necessary channels for wastewater to contact the packing, allowing wastewater to pass through without leakage of the packing. The biochar packing 15 employs a graded filling strategy with coarse particles at both ends and fine particles in the middle. The coarse particle layer at both ends prevents the fine biochar particles in the middle from leaking out of the mesh plates 17, while also uniformly dispersing the water flow and reducing the risk of clogging. The fine particles in the middle provide a large specific surface area, ensuring adsorption efficiency. A handle 20 is used to lift the entire biochar adsorption module 8 for easy disassembly, assembly, and maintenance.

[0042] like Figure 1 , 3 As shown, the inner and outer walls of the adsorption treatment tank 4 are provided with radially protruding limiting protrusions 21, and the biochar adsorption assembly 8 is detachably locked between two adjacent sets of limiting protrusions 21. A buffer gap 22 is formed between adjacent biochar adsorption assemblies 8, and a intercepting plate can be detachably inserted into the buffer gap 22 to cut off the flow of sewage. The buffer gap 22 is located between two opposing limiting protrusions 21, and the front end of the limiting protrusion 21 is provided with a radially recessed partition slot 23. The two sides of the intercepting plate can be inserted into the partition slot 23, and the bottom side of the intercepting plate can abut against the bottom of the adsorption treatment tank 4.

[0043] Specifically, a slot is formed between two sets of adjacent limiting protrusions 21, allowing the biochar adsorption component 8 to be detachably and securely inserted into the slot, much like inserting it into a bookshelf. This enables rapid positioning, fixing, and disassembly of the biochar adsorption component 8 without the need for complex tools or connectors, forming the structural basis for the modular design. The buffer gap 22 serves two purposes: buffering wastewater and providing a location for the interceptor plate. The interceptor plate physically cuts off the annular flow channel. When a component needs replacement, the flow channels before and after it can be cut off, allowing for individual maintenance of that component and improving operational flexibility. The partition slot 23 at the front end of the limiting protrusion 21 provides a precise slot for the interceptor plate, ensuring convenient and stable installation. The bottom side of the interceptor plate is sealed against the bottom of the tank, guaranteeing the interception effect.

[0044] In this embodiment, an inlet buffer zone 24 is formed between the first biochar adsorption component 8 and the radial baffle 5 along the sewage flow direction. The inlet 6 is located within the inlet buffer zone 24 and is radially inner. An outlet buffer zone 25 is formed between the last biochar adsorption component 8 and the radial baffle 5 along the sewage flow direction. The outlet 7 is located within the outlet buffer zone 25 and is radially outer. A sewage input pipe (not specifically shown in the figure) is provided above the cylindrical body 1. The sewage input pipe spans the adsorption treatment tank 4, and its output end extends into the upper part of the pretreatment tank 3. The sewage input pipe is located above the radial baffle 5 between the inlet buffer zone 24 and the outlet buffer zone 25.

[0045] Specifically, the inlet buffer zone 24 is located at the starting point of the water flow, which reduces the flow velocity and kinetic energy of the sewage flowing in from the central pool and distributes it evenly across the entire cross-section of the annular flow channel, avoiding significant hydraulic impact on the first biochar adsorption module 8. The effluent buffer zone 25 can smoothly collect the treated effluent. The sewage inlet pipe is overhead, does not occupy the core treatment area, and is not above the biochar adsorption module 8, so it will not affect the installation and removal of the biochar adsorption module 8.

[0046] Specific working principle: The wastewater to be treated enters the pretreatment tank 3 through the wastewater inlet pipe. In the tank, larger solid impurities are first filtered out by the filter assembly 9, and then flows into the sedimentation zone 10 below for preliminary sedimentation. The supernatant from the sedimentation zone 10 enters the inlet buffer zone 24 through the inlet 6, and then passes through three sets of biochar adsorption assemblies 8 for adsorption treatment. The effluent after adsorption enters the effluent buffer zone 25 and is finally discharged from the outlet 7.

[0047] When it is necessary to replace or maintain a single biochar adsorption module 8, it can be done directly during system operation or after the water flow is cut off. When cutting off the flow, insert a retaining plate into the buffer gap 22 upstream and downstream of the corresponding biochar adsorption module 8. The bottom of the retaining plate should be sealed to the bottom of the pool. The retaining plate can be removed after the biochar adsorption module 8 has been replaced or maintained.

[0048] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A device for mitigating wastewater load shocks using biochar, comprising a circular cylindrical body (1), characterized in that, An annular baffle (2) is coaxially arranged inside the cylindrical body (1). A columnar pretreatment tank (3) is formed on the inner side of the annular baffle (2), and an annular adsorption treatment tank (4) is formed on the outer side. The adsorption treatment tank (4) is cut off by a radial baffle (5). An inlet (6) and an outlet (7) are respectively provided on both sides of the radial baffle (5). The sewage in the pretreatment tank (3) is input into the adsorption treatment tank (4) from the inlet (6) and flows in the circumferential direction, and is finally discharged from the outlet (7). At least two sets of biochar adsorption components (8) are detachably arranged between the inlet (6) and the outlet (7) along the flow direction of the sewage.

2. The device for mitigating wastewater load shocks using biochar according to claim 1, characterized in that, The pretreatment tank (3) is provided with a filter assembly (9) at the top and a sedimentation zone (10) at the bottom. The water inlet (6) is provided between the filter assembly (9) and the sedimentation zone (10). The pretreatment tank (3) includes a conical bottom (11) and a sewage outlet (12) is provided at the lowest point of the conical bottom (11).

3. The device for mitigating wastewater load shocks using biochar according to claim 1, characterized in that, The biochar adsorption component (8) is fan-shaped, including a fan-shaped cylindrical support frame (14) and biochar filler (15) filled in the support frame (14).

4. The device for mitigating wastewater load shocks using biochar according to claim 3, characterized in that, The radial inner and outer sides of the support frame (14) include arc-shaped plates (16), which are attached to the wall of the adsorption treatment tank (4); the circumferential ends of the support frame (14) include mesh plates (17).

5. The device for mitigating wastewater load shocks using biochar according to claim 4, characterized in that, The biochar packing material (15) has coarse biochar (18) at both ends near the mesh plate (17) and fine biochar (19) in the middle. The mesh plate (17) allows sewage to pass through but does not allow coarse biochar to pass through. The top of the support frame (14) is provided with a handle (20).

6. The device for mitigating wastewater load shocks using biochar according to claim 1, characterized in that, The adsorption treatment tank (4) has radially protruding limiting protrusions (21) on its inner and outer walls, and the biochar adsorption assembly (8) is detachably locked between two adjacent sets of limiting protrusions (21).

7. The device for mitigating wastewater load shocks using biochar according to claim 6, characterized in that, A buffer gap (22) is formed between adjacent biochar adsorption components (8), into which a cut-off plate can be detachably inserted to cut off the flow of sewage.

8. The device for mitigating wastewater load shocks using biochar according to claim 7, characterized in that, The buffer gap (22) is located between two opposing limiting protrusions (21). The front end of the limiting protrusion (21) is provided with a radially recessed partition slot (23). The two sides of the interception plate can be inserted into the partition slot (23). The bottom side of the interception plate can abut against the bottom of the adsorption treatment tank (4).

9. The apparatus for mitigating wastewater load shocks using biochar according to any one of claims 1-8, characterized in that, An inlet buffer zone (24) is formed between the first biochar adsorption component (8) along the sewage flow direction and the radial baffle (5), and the inlet (6) is located within the inlet buffer zone (24) and is located radially inside; An effluent buffer zone (25) is formed between the last biochar adsorption component (8) along the sewage flow direction and the radial baffle (5), and the effluent outlet (7) is located within the effluent buffer zone (25) and is located radially outward or at the bottom.

10. The apparatus for mitigating wastewater load shocks using biochar according to claim 9, characterized in that, The cylindrical body (1) is provided with a sewage input pipe above it. The sewage input pipe spans the adsorption treatment tank (4) and its output end extends into the upper part of the pretreatment tank (3). The sewage input pipe is located above the inlet buffer zone (24) and / or the outlet buffer zone (25).

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