A high-efficiency stepped biofilter integrated equipment

Abstract

The invention discloses a high-efficiency step-type biological filter integrated device, belonging to the field of biological filter filtration technology, a high-efficiency step-type biological filter integrated device, including a sedimentation tank, a pretreatment tank, an aeration tank and a drainage tank; the aeration tank includes a centrifugal impurity collecting device, and the centrifugal impurity collecting device is located at the lower end of the aeration tank; the centrifugal impurity collecting device includes a machine base, a rotating shaft, an adsorption part, an adsorption brush and an abutment part; the machine base is located on the side wall of the aeration tank; a motor is arranged in the machine base, and the rotating shaft is rotatably connected to the machine base; the adsorption part is located on the inner wall of the centrifugal impurity collecting device, and the adsorption part is provided with evenly arranged adsorption mesh hair; the adsorption brush is located on one side close to the inner wall of the centrifugal impurity collecting device, and one end of the adsorption brush penetrates the wall of the centrifugal impurity collecting device and extends to the outside of the aeration tank; the abutment part is located on the side wall of the centrifugal impurity collecting device away from the pretreatment tank; the middle part of the abutment part is concave. It can realize the step-by-step acceleration of the film formation and renewal of the biological filter and prevent the bottom of the filter from being blocked.

Description

Technical Field

[0001] The invention relates to the technical field of biofilter filtration, and more specifically to a high-efficiency stepped biofilter integrated device. Background Art

[0002] Aerated biological filter is a new type of sewage biological treatment technology first developed in Europe and the United States in the late 1980s and early 1990s. Aerated biological filter is developed from trickling filter and belongs to the category of biofilm method. It was originally used for tertiary treatment and later developed into direct use for secondary treatment.

[0003] The existing biofilter can effectively remove organic matter, nitrogen, phosphorus and other pollutants in sewage, and the effluent quality is good. The energy consumption is relatively low, the maintenance and management are relatively simple, and the human and material investment required is relatively small. When the sewage volume and water quality fluctuate within a certain range, it can still maintain a relatively stable treatment effect.

[0004] However, as the existing biofilter runs longer, the filter media may be clogged by impurities and biofilms, affecting water flow and treatment effects, and requiring regular backwashing. Although anti-clogging filter heads are installed on the filter media layer, the residual filtration cannot be effectively treated in the later stage. Backwashing only solves the short-term blockage problem, and the machine needs to be shut down for maintenance in the later stage, which cannot effectively clean and discharge the filter media. At the same time, if the aging biofilm cannot be shed and updated in time, it may affect the treatment efficiency. Summary of the invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a high-efficiency stepped biofilter integrated device, which can accelerate the membrane formation and renewal of the biofilter in a stepped manner and prevent clogging of the bottom of the filter.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] A high-efficiency stepped biofilter integrated device, comprising a sedimentation tank, a pretreatment tank, an aeration tank and a drainage tank, wherein the sedimentation tank, the pretreatment tank, the aeration tank and the drainage tank are interconnected in sequence through pipelines; the aeration tank comprises a centrifugal impurity collecting device, wherein the centrifugal impurity collecting device is located at the lower end of the aeration tank, wherein one end of the centrifugal impurity collecting device is rotatably connected to the water outlet end of the pretreatment tank, and the other end is detachably connected to the side wall of the aeration tank; the centrifugal impurity collecting device comprises a machine base, a rotating shaft, an adsorption part, an adsorption brush and an abutment part; the machine base is located on the side wall of the aeration tank, and the machine base is connected to the side wall of the aeration tank The wall is detachably connected; a motor is arranged in the machine base, and a rotating shaft is rotatably connected to the machine base; the adsorption part is located on the inner wall of the centrifugal impurity collecting device, and the adsorption part is provided with evenly arranged adsorption mesh hair; the adsorption brush is located on the side close to the inner wall of the centrifugal impurity collecting device, and one end of the adsorption brush penetrates the wall of the centrifugal impurity collecting device and extends to the outside of the aeration tank; the abutment part is located on the side wall of the centrifugal impurity collecting device away from the pretreatment tank, and the abutment part is fixedly connected to the centrifugal impurity collecting device; the middle part of the abutment part is recessed, so that the head of the adsorption brush abuts against the middle part of the abutment part for limiting.

[0008] Furthermore, both ends of the centrifugal debris collecting device are in a closed state, and the wall of the centrifugal debris collecting device is in a filter mesh shape; the centrifugal debris collecting device is at least a double-layer mesh structure, and a filter interlayer is also arranged on the outside of the adsorption part of the centrifugal debris collecting device, and at least a filter cotton body is placed in the filter interlayer.

[0009] Furthermore, the adsorption brush is evenly arranged with adsorption bristles, which are staggered horizontally and vertically to cross-match with the adsorption mesh hair on the adsorption part, so that the adsorption bristles can scrape off the debris on the adsorption mesh hair.

[0010] Furthermore, the pretreatment tank is located at the rear side of the sedimentation tank, and the pretreatment tank includes a debris filtration layer, a coarse filtration layer, a fine filtration layer, a lower water trough and a water distribution trough; the debris filtration layer is located at the top layer of the pretreatment tank; the coarse filtration layer is located at the middle layer of the pretreatment tank; the fine filtration layer is located at the bottom layer of the pretreatment tank; the lower water trough is located at the bottom end of the pretreatment tank, and the upper end edge of the lower water trough is fixedly connected to the side wall of the pretreatment tank to form an inclined surface; the bottom end of the lower water trough is connected to the water distribution trough through a pipeline, and the lower water trough and the water distribution trough are interconnected; the water distribution trough is interconnected with the rear aeration tank through a pipeline.

[0011] Furthermore, the aeration tank also includes an aeration pipe, which is located at the lower end of the filter material layer in the aeration tank, and is provided with a plurality of evenly arranged air diffusers.

[0012] Furthermore, the aeration tank also includes a filter layer, which is located in the middle of the aeration tank and fixedly connected to both sides of the aeration tank. A plurality of evenly arranged anti-blocking filter heads are provided through the filter layer, and the anti-blocking filter heads are detachably connected to the filter layer wall.

[0013] Furthermore, the aeration tank also includes a backwash water inlet pipe and a backwash air inlet pipe, which are respectively located on both sides of the lower end of the pollution inlet layer, and the backwash water inlet pipe is connected to the outer water inlet end through a pipeline, and a water inlet valve is also provided on the pipeline connecting the backwash water inlet pipe and the water inlet end to control the backwash water inlet pipe to feed water into the aeration tank; the backwash air inlet pipe is connected to the outer air inlet end through a pipeline, and an air inlet valve is also provided on the pipeline connecting the backwash air inlet pipe and the air inlet end to control the backwash air inlet pipe to feed air into the aeration tank.

[0014] Furthermore, the drainage pool includes a baffle, which is located in the middle of the drainage pool and extends upward from the bottom of the drainage pool to divide the drainage pool into two cavities; the two cavities are respectively a backwash drainage chamber and a drainage chamber, and the upper end of the drainage pool is a cavity that can connect the backwash drainage chamber and the drainage chamber to each other.

[0015] Furthermore, a backwash drainage pipe is provided at the lower end of the backwash drainage chamber, which leads to the outside of the drainage pool, and a backwash drainage valve is provided on the backwash drainage pipe to control the drainage of the backwash drainage chamber to the outside; a drainage pipe is also provided at the lower end of the drainage chamber, which leads to the outside of the drainage pool, and a drainage valve is provided on the drainage pipe to control the drainage of the drainage chamber to the outside.

[0016] Furthermore, a pipe is connected to one side of the upper end of the sedimentation tank, and a water pump is provided outside the pipe to extract the sewage after sedimentation at the upper end of the sedimentation tank and discharge it into the pretreatment tank at the rear side.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] 1. This scheme includes a sedimentation tank, a pretreatment tank, an aeration tank and a drainage tank, which are interconnected through pipelines in sequence; the aeration tank includes a centrifugal impurity collecting device, which is located at the lower end of the aeration tank, one end of the centrifugal impurity collecting device is rotatably connected to the water outlet end of the pretreatment tank, and the other end is detachably connected to the side wall of the aeration tank; the centrifugal impurity collecting device includes a machine base, a rotating shaft, an adsorption part, an adsorption brush and an abutment part; the machine base is located on the side wall of the aeration tank, and the machine base is detachably connected to the side wall of the aeration tank ; A motor is arranged inside the machine base, and a rotating shaft is rotatably connected to the machine base; the adsorption part is located on the inner wall of the centrifugal debris collecting device, and an evenly arranged adsorption mesh is arranged on the adsorption part; the adsorption brush is located on the side close to the inner wall of the centrifugal debris collecting device, and one end of the adsorption brush penetrates the wall of the centrifugal debris collecting device and extends to the outside of the aeration tank; the abutment part is located on the side wall of the centrifugal debris collecting device away from the pretreatment tank, and the abutment part is fixedly connected to the centrifugal debris collecting device; the middle part of the abutment part is concave, so that the head of the adsorption brush abuts against the middle part of the abutment part for limiting. This arrangement effectively improves the filtering effect, as well as the subsequent maintenance of the aeration tank and the cleaning of the filter material. It greatly improves the work efficiency.

[0019] 2. Both ends of the centrifugal impurity collecting device are closed, and the wall of the centrifugal impurity collecting device is a filter mesh; the centrifugal impurity collecting device is at least a double-layer mesh structure, and a filter interlayer is also arranged outside the adsorption part of the centrifugal impurity collecting device, and at least a filter cotton body is placed in the filter interlayer. This arrangement can filter the sewage multiple times to prevent problems such as blockage caused by excessive filtering impurities, greatly reduce the number of subsequent inspections and cleaning maintenance, and effectively improve the efficiency of continuous work.

[0020] 3. The adsorption brush is evenly arranged with adsorption bristles, which are staggered horizontally and vertically to cross the adsorption net hair on the adsorption part, so that the adsorption bristles can scrape off the debris on the adsorption net hair. In this way, the brushes cooperate with each other to achieve cleaning and collection, effectively improving the filtration efficiency.

[0021] 4. The pretreatment tank is located at the rear side of the sedimentation tank. The pretreatment tank includes a debris filtration layer, a coarse filtration layer, a fine filtration layer, a lower water tank and a water distribution tank. The debris filtration layer is located at the top layer of the pretreatment tank. The coarse filtration layer is located at the middle layer of the pretreatment tank. The fine filtration layer is located at the bottom layer of the pretreatment tank. The lower water tank is located at the bottom of the pretreatment tank. The upper edge of the lower water tank is fixedly connected to the side wall of the pretreatment tank to form an inclined surface. The bottom end of the lower water tank is connected to the water distribution tank through a pipe, and the lower water tank and the water distribution tank are interconnected. The water distribution tank is interconnected with the rear aeration tank through a pipe. This arrangement, through the cooperation of multiple filter layers, can multi-decompose the sewage for filtration treatment and improve the filtration quality.

[0022] 5. The aeration tank also includes an aeration pipe, which is located at the lower end of the filter material layer in the aeration tank, and is provided with a plurality of evenly arranged air diffusers. This arrangement effectively speeds up the mixing of sewage and biological filter material and improves the filtration efficiency.

[0023] 6. The aeration tank also includes a filter layer, which is located in the middle of the aeration tank. The filter layer is fixedly connected to both sides of the aeration tank. A plurality of evenly arranged anti-blocking filter heads are provided through the filter layer, and the anti-blocking filter heads are detachably connected to the filter layer wall. This arrangement prevents the filter head from being blocked, which causes the biological filter tank to be unable to operate normally. If the aeration tank is blocked, the maintenance time is long, which affects the work efficiency. The anti-blocking filter head greatly improves the work efficiency and reduces the probability of blockage events.

[0024] 7. The aeration tank also includes a backwash water inlet pipe and a backwash air inlet pipe, which are located on both sides of the lower end of the sewage layer. The backwash water inlet pipe is connected to the outer water inlet end through a pipe, and a water inlet valve is also provided on the pipe connecting the backwash water inlet pipe and the water inlet end to control the backwash water inlet pipe to enter the aeration tank; the backwash air inlet pipe is connected to the outer air inlet end through a pipe, and an air inlet valve is also provided on the pipe connecting the backwash air inlet pipe and the air inlet end to control the backwash air inlet pipe to enter the aeration tank. Regularly check the aeration tank through backwash air and water inlet to prevent blockage and affect work efficiency.

[0025] 8. The drainage pool includes a baffle plate, which is located in the middle of the drainage pool and extends upward from the bottom of the drainage pool to divide the drainage pool into two cavities; the two cavities are the backwash drainage cavity and the drainage cavity, and the upper end of the drainage pool is a cavity that can connect the backwash drainage cavity and the drainage cavity. This arrangement effectively differentiates the filtered discharge water and the backwash water, improves efficiency and reduces costs.

[0026] 9. A backwash drainage pipe is also provided at the lower end of the backwash drainage chamber, which leads to the outside of the drainage pool, and a backwash drainage valve is provided on the backwash drainage pipe to control the backwash drainage chamber to drain outward; A drainage pipe is also provided at the lower end of the drainage chamber, which leads to the outside of the drainage pool, and a drainage valve is provided on the drainage pipe to control the drainage chamber to drain outward. This arrangement effectively differentiates the filtered discharged water and the backwash water, and effectively removes and collects them through the valve to prevent self-flow.

[0027] 10. A pipe is connected to one side of the upper end of the sedimentation tank, and a water pump is installed outside the pipe to extract the sewage after sedimentation from the upper end of the sedimentation tank and discharge it into the pretreatment tank at the rear. This setting effectively speeds up the transportation of sewage from the sedimentation tank to the pretreatment tank and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall planar structure of Example 1 of the present invention;

[0029] Figure 2 For the present invention Figure 1 The enlarged structural diagram at A and the partial enlarged structural diagram;

[0030] Figure 3 This is a schematic diagram of the planar structure of Embodiment 2 of the present invention;

[0031] Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure at B in the middle and a schematic diagram of the partial enlarged structure.

[0032] Description of the numbers in the figure:

[0033] Sedimentation tank 1, water pump 11, pretreatment tank 2, debris filter layer 21, coarse filter layer 22, fine filter layer 23, lower water tank 24, water distribution tank 25, water distribution valve 251, aeration tank 3, aeration pipe 31, air diffuser 311, filter layer 32, anti-blocking filter head 321, centrifugal debris collecting device 33, machine base 331, rotating shaft 332, adsorption part 333, adsorption brush 334, adsorption brush bristles 334-1, abutment part 335, filter interlayer 336, backwash water inlet pipe 34, water inlet valve 341, backwash air inlet pipe 35, air inlet valve 351, drainage tank 4, baffle 41, backwash drainage chamber 42, backwash drainage valve 421, drainage chamber 43, drainage valve 431. DETAILED DESCRIPTION

[0034] Embodiment 1:

[0035] See also Figure 1-2 , a high-efficiency stepped biofilter integrated equipment, comprising a sedimentation tank 1, a pretreatment tank 2, an aeration tank 3 and a drainage tank 4. The sedimentation tank 1, the pretreatment tank 2, the aeration tank 3 and the drainage tank 4 are connected in sequence through pipelines.

[0036] The sedimentation tank 1 is located at the operation head end of the integrated equipment. The sedimentation tank 1 is used to place the sewage to be treated so that the sediments such as mud and sand can settle to the bottom. A pipe is connected to one side of the upper end of the sedimentation tank 1, and a water pump 11 is arranged outside the pipe to extract the sewage after sedimentation at the upper end of the sedimentation tank 1 and discharge it into the pretreatment tank 2 at the rear side.

[0037] The pretreatment tank 2 is located at the rear side of the sedimentation tank 1, and the pretreatment tank 2 includes a debris filter layer 21, a coarse filter layer 22, a fine filter layer 23, a lower water tank 24 and a water distribution tank 25. The debris filter layer 21 is located at the top layer of the pretreatment tank 2, and the debris filter layer 21 is used to filter large particles of debris in the sewage. The coarse filter layer 22 is located in the middle layer of the pretreatment tank 2, and the coarse filter layer 22 is used to filter large particles of suspended matter in the sewage. The fine filter layer 23 is located at the bottom layer of the pretreatment tank 2, and the fine filter layer 23 is used to filter small particles of suspended matter in the sewage. The lower water tank 24 is located at the bottom of the pretreatment tank 2, and the lower water tank 24 is V-shaped so that the sewage filtered at the upper end of the pretreatment tank 2 can flow down faster. The upper edge of the lower water tank 24 is fixedly connected to the side wall of the pretreatment tank 2 to form an inclined surface. The bottom end of the lower water tank 24 is connected to the water distribution tank 25 through a pipeline, and the lower water tank 24 and the water distribution tank 25 are connected to each other. The water distribution tank 25 is interconnected with the rear aeration tank 3 through a pipeline. A water distribution valve 251 is also provided on the pipeline connecting the water distribution tank 25 and the aeration tank 3 to control the water distribution tank 25 to transport sewage to the aeration tank 3.

[0038] The aeration tank 3 is located at the rear side and lower end of the pretreatment tank 2. The aeration tank 3 includes an aeration pipe 31, a filter layer 32, a centrifugal impurity collection device 33, a backwash water inlet pipe 34 and a backwash air inlet pipe 35. The aeration tank 3 is divided into two layers by the filter layer 32. The upper layer is the filter material layer in the aeration tank 3. The filter material layer is added with biological filter material to filter the sewage; the lower layer is the sewage inlet layer. The sewage inlet layer mainly passes the sewage in the water distribution tank 25 into the filter material layer through the filter layer 32. The aeration pipe 31 is located at the lower end of the filter material layer in the aeration tank 3. The aeration pipe 31 is provided with a plurality of evenly arranged air diffusers 311 to accelerate the mixing of the biological filter material and the sewage. The filter layer 32 is located in the middle of the aeration tank 3. The filter layer 32 is fixedly connected to both sides of the aeration tank 3. A plurality of evenly arranged anti-blocking filter heads 321 are provided through the filter layer 32. The anti-blocking filter heads 321 are detachably connected to the wall of the filter layer 32. The centrifugal impurity collecting device 33 is located at the lower end of the filter layer 32. The centrifugal impurity collecting device 33 is cylindrical. One end of the centrifugal impurity collecting device 33 is connected to the outlet pipe of the aeration tank 3 connected to the water distribution tank 25 and is rotatably connected to the outlet pipe end. The other end of the centrifugal impurity collecting device 33 is detachably connected to the side wall of the aeration tank 3. The centrifugal impurity collecting device 33 and the water distribution tank 25 are connected to each other through a pipeline. The centrifugal impurity collecting device 33 includes a base 331, a rotating shaft 332, an adsorption part 333, an adsorption brush 334 and an abutment part 335. The base 331 is located on the side wall of the aeration tank 3, and the base 331 is detachably connected to the side wall of the aeration tank 3. A motor is arranged in the base 331, and a rotating shaft 332 is also arranged in the middle of the base 331. The rotating shaft 332 is rotatably connected to the base 331. The motor in the base 331 drives the rotating shaft 332 to rotate. The motor has the ability to rotate forward and reverse, so that the rotating shaft 332 also has the ability to rotate forward and reverse. Both ends of the centrifugal debris collecting device 33 are in a closed state, and the wall of the centrifugal debris collecting device 33 is in the shape of a filter mesh. The adsorption part 333 is located on the inner wall of the centrifugal debris collecting device 33, and the adsorption part 333 is provided with evenly arranged adsorption mesh hairs to filter the debris and suspended matter in the sewage again. The adsorption brush 334 is located on one side close to the inner wall of the centrifugal debris collecting device 33, and one end of the adsorption brush 334 penetrates the wall of the centrifugal debris collecting device 33 and extends to the outside of the aeration tank 3 to facilitate the replacement of the adsorption brush 334. The other end of the adsorption brush 334 abuts against the abutment part 335. The adsorption brush 334 is evenly arranged with adsorption bristles 334-1, and the adsorption bristles 334-1 are staggered horizontally and vertically to cross-match with the adsorption mesh hairs on the adsorption part 333, so that the adsorption brush bristles 334-1 can scrape off the debris on the adsorption mesh hairs. The abutment portion 335 is located on the side wall of the centrifugal debris collecting device 33 away from the water distribution tank 25, and the abutment portion 335 is fixedly connected to the centrifugal debris collecting device 33. The middle part of the abutment portion 335 is concave, so that the head of the adsorption brush 334 abuts against the middle part of the abutment portion 335 for limiting.The backwash water inlet pipe 34 and the backwash air inlet pipe 35 are respectively located on both sides of the lower end of the sewage inlet layer. The backwash water inlet pipe 34 is connected to the outer water inlet end through a pipeline. The pipeline connecting the backwash water inlet pipe 34 and the water inlet end is also provided with an inlet valve 341 to control the backwash water inlet pipe 34 to feed water into the aeration tank 3; the backwash air inlet pipe 35 is connected to the outer air inlet end through a pipeline. The pipeline connecting the backwash air inlet pipe 35 and the air inlet end is also provided with an inlet valve 351 to control the backwash air inlet pipe 35 to feed air into the aeration tank 3.

[0039] It should be noted that when the centrifugal impurity collecting device 33 is in operation, the centrifugal impurity collecting device 33 rotates, and the sewage in the centrifugal impurity collecting device 33 is thrown to the surrounding walls by centrifugal action, and the sewage is collected again by the adsorption part on the wall. The filtered sewage can be normally thrown out from the mesh of the centrifugal impurity collecting device 33 and enter the anti-blocking filter head 321 in the filter layer 32 for re-filtration and then enter the final filter material layer to filter microorganisms and other substances.

[0040] The drainage tank 4 is located at the rear side and the lower end of the aeration tank 3, and the upper end of the aeration tank 3 is interconnected with the drainage tank 4 through a pipeline. The drainage tank 4 includes a baffle 41, a backwash drainage chamber 42 and a drainage chamber 43. The baffle 41 is located in the middle of the drainage tank 4, and the baffle 41 extends upward from the bottom end of the drainage tank 4 to divide the drainage tank 4 into two chambers. The two chambers are the backwash drainage chamber 42 and the drainage chamber 43, respectively. The upper end of the drainage tank 4 is a cavity that can interconnect the backwash drainage chamber 42 and the drainage chamber 43. A backwash drainage pipe is also provided at the lower end of the backwash drainage chamber 42, and the backwash drainage pipe leads to the outside of the drainage tank 4. A backwash drainage valve 421 is provided on the backwash drainage pipe to control the backwash drainage chamber 42 to drain water outward. A drainage pipe is also provided at the lower end of the drainage chamber 43, and the drainage pipe leads to the outside of the drainage tank 4. A drainage valve 431 is provided on the drainage pipe to control the drainage chamber 43 to drain water outward.

[0041] Working principle:

[0042] When the present invention is used, the sewage is firstly precipitated in a sedimentation tank to filter the silt and the like. The sewage is then transported to the pretreatment tank by a water pump, and the sewage is filtered for secondary debris by the pretreatment tank, including filtering of large and small particles and part of the suspended matter. After filtering, the sewage enters the water distribution tank through the lower water tank. In this process, biological filter material can be added to the upper filter material layer of the aeration tank to form part of the biofilm in advance. After the filter material layer step in the aeration tank is prepared, the sewage in the water distribution tank can be transported to the centrifugal collection device through the water distribution valve and enter the aeration tank. The sewage entering the centrifugal collection device can attach part of the suspended matter and debris to the adsorption part through the centrifugal action, and finally the treatment is completed and it can be cleaned by the adsorption brush. The sewage filtered by the centrifugal collection device is then filtered by the anti-blocking filter head of the filter layer for the last step of debris filtration, so as to flow to the filter material pool in the aeration tank for biological filter material filtration reaction. The reaction is accelerated through the aeration pipe and the air diffuser, and the microorganisms and other substances in the sewage are filtered, and finally it flows from the uppermost layer to the drainage tank for subsequent drainage work. The backwashing operation method is an existing operation method and will not be described in detail here.

[0043] Embodiment 2:

[0044] See also Figure 3-4 , a high-efficiency stepped biological filter integrated equipment, which is different from the first embodiment in that the centrifugal impurity collecting device 33 is a double-layer mesh structure, and a filter interlayer 336 is further provided on the outside of the adsorption part 333 of the centrifugal impurity collecting device 33, and a filter cotton body is placed in the filter interlayer 336, so that both forward filtration and backwashing can be adsorbed through the filter interlayer 336, thereby enhancing the filtration effect.

[0045] It should be noted that when the centrifugal impurity collecting device 33 is in operation, the centrifugal impurity collecting device 33 can be divided into forward rotation and reverse rotation. When the overall equipment is normally used for sewage impurity removal, the centrifugal impurity collecting device 33 rotates forward. While rotating forward, the sewage in the centrifugal impurity collecting device 33 is thrown to the surrounding walls by centrifugal action, and the sewage is collected by the adsorption part 333 and the filter interlayer 336 on the wall. The filtered sewage can be normally thrown out from the mesh body of the centrifugal impurity collecting device 33 and enter the anti-blocking filter head 321 in the filter layer 32 for re-filtration and then enter the final filter material layer for filtering microorganisms and other substances. When the overall equipment needs backwashing, the centrifugal impurity collecting device 33 is reversed, and the backwashing debris in the anti-blocking filter head 321 falls into the filter interlayer 336 to perform secondary collection of the filtered debris, which is convenient for subsequent maintenance. At the same time, the relative forward rotation speed is greater than the reverse rotation speed, so that the reversed filter interlayer can fully adsorb the filtered debris in the anti-blocking filter head 321.

[0046] Working principle:

[0047] When the present invention is used, the sewage is firstly precipitated in a sedimentation tank to filter the silt and the like. The sewage is then transported to the pretreatment tank by a water pump, and the sewage is filtered for secondary debris by the pretreatment tank, including filtering of large and small particles and some suspended matter. After filtering, it enters the water distribution tank through the lower water tank. In this process, biological filter material can be added to the upper filter material layer of the aeration tank to form a part of the biofilm in advance. After the preparation of the filter material layer in the aeration tank is completed, the sewage in the water distribution tank can be transported to the centrifugal collection device through the water distribution valve and enter the aeration tank. The sewage entering the centrifugal collection device can attach some suspended matter and debris to the adsorption part and the filter interlayer through the centrifugal action, and can be cleaned by the adsorption brush after the final treatment is completed. The sewage filtered by the centrifugal collection device is then filtered through the anti-blocking filter head of the filter layer to perform the last step of debris filtration, so as to flow to the filter material pool in the aeration tank for biological filter material filtration reaction. The reaction is accelerated through aeration pipes and air diffusers, and the microorganisms and other substances in the sewage are filtered, and finally flow from the top layer to the drainage pool for subsequent drainage work. The backwashing operation method is the existing operation method and will not be described here. However, the filtered debris dropped from the anti-blocking filter head during backwashing will adhere to the outside of the filter interlayer, and the dropped filtered debris will be adsorbed and collected to improve the efficiency of subsequent maintenance and cleaning.

Claims

1. An efficient stepped biofilter integrated device, comprising a sedimentation tank (1), a pretreatment tank (2), an aeration tank (3) and a drainage tank (4), wherein the sedimentation tank (1), the pretreatment tank (2), the aeration tank (3) and the drainage tank (4) are interconnected in sequence through pipelines; characterized in that: The aeration tank (3) comprises a centrifugal impurity collecting device (33), wherein the centrifugal impurity collecting device (33) is located at the lower end of the aeration tank (3), one end of the centrifugal impurity collecting device (33) is rotatably connected to the water outlet end of the pretreatment tank (2), and the other end is detachably connected to the side wall of the aeration tank (3); the centrifugal impurity collecting device (33) comprises a machine base (331), a rotating shaft (332), an adsorption portion (333), an adsorption brush (334), and an abutment portion (335); the machine base (331) is located at the side wall of the aeration tank (3), and the machine base (331) is detachably connected to the side wall of the aeration tank (3); a motor is arranged in the machine base (331), and the rotating shaft (332) is rotatably connected to the machine base (331); the adsorption portion (333) is located on the inner wall of the centrifugal impurity collecting device (33), and the adsorption portion (333) is provided with adsorption mesh hairs that are evenly arranged; the adsorption brush (334) is located close to the machine base (335); On one side of the inner wall of the centrifugal debris collecting device (33), one end of the adsorption brush (334) penetrates the wall of the centrifugal debris collecting device (33) and extends to the outside of the aeration tank (3); the abutment portion (335) is located on the side wall of the centrifugal debris collecting device (33) away from the pretreatment tank (2), and the abutment portion (335) is fixedly connected to the centrifugal debris collecting device (33); the middle part of the abutment portion (335) is recessed so that the head of the adsorption brush (334) abuts against the middle part of the abutment portion (335) for position limiting; both ends of the centrifugal debris collecting device (33) are in a closed state, and the wall of the centrifugal debris collecting device (33) is in the shape of a filter mesh; the centrifugal debris collecting device (33) is at least a double-layer mesh structure, and a filter interlayer (336) is further provided on the outside of the adsorption portion (333) of the centrifugal debris collecting device (33), and at least one filter cotton body is placed in the filter interlayer (336).

2. The high-efficiency step-type biofilter integrated device according to claim 1, characterized in that: The adsorption brush (334) is evenly arranged with adsorption bristles (334-1), which are staggered horizontally and vertically to cross-match with the adsorption mesh hair on the adsorption part (333), so that the adsorption bristles (334-1) can scrape off the debris on the adsorption mesh hair.

3. The high-efficiency stepped biofilter integrated device according to claim 1, characterized in that: The pretreatment tank (2) is located at the rear side of the sedimentation tank (1), and comprises a debris filtration layer (21), a coarse filtration layer (22), a fine filtration layer (23), a lower water tank (24) and a water distribution tank (25); the debris filtration layer (21) is located at the uppermost layer of the pretreatment tank (2); the coarse filtration layer (22) is located at the middle layer of the pretreatment tank (2); the fine filtration layer (23) is located at the bottom layer of the pretreatment tank (2); the lower water tank (24) is located at the lowermost end of the pretreatment tank (2), and the upper edge of the lower water tank (24) is fixedly connected to the side wall of the pretreatment tank (2) to form an inclined surface; the bottom end of the lower water tank (24) is connected to the water distribution tank (25) through a pipeline, and the lower water tank (24) and the water distribution tank (25) are connected to each other; the water distribution tank (25) is connected to the rear aeration tank (3) through a pipeline.

4. The high-efficiency step-type biofilter integrated device according to claim 1, characterized in that: The aeration tank (3) further comprises an aeration pipe (31), wherein the aeration pipe (31) is located at the lower end of the filter material layer in the aeration tank (3), and a plurality of evenly arranged air diffusers (311) are arranged on the aeration pipe (31).

5. The high-efficiency step-type biofilter integrated device according to claim 1, characterized in that: The aeration tank (3) further comprises a filter layer (32), the filter layer (32) being located in the middle of the aeration tank (3), the filter layer (32) being fixedly connected to both sides of the aeration tank (3), a plurality of evenly arranged anti-blocking filter heads (321) being provided through the filter layer (32), and the anti-blocking filter heads (321) being detachably connected to the wall of the filter layer (32).

6. The high-efficiency step-type biofilter integrated device according to claim 1, characterized in that: The aeration tank (3) further comprises a backwash water inlet pipe (34) and a backwash air inlet pipe (35), the backwash water inlet pipe (34) and the backwash air inlet pipe (35) being respectively located on both sides of the lower end of the sewage inlet layer, the backwash water inlet pipe (34) being connected to the outer water inlet end via a pipe, and a water inlet valve (341) being provided on the pipe connecting the backwash water inlet pipe (34) and the water inlet end to control the backwash water inlet pipe (34) to feed water into the aeration tank (3); the backwash air inlet pipe (35) being connected to the outer air inlet end via a pipe, and an air inlet valve (351) being provided on the pipe connecting the backwash air inlet pipe (35) and the air inlet end to control the backwash air inlet pipe (35) to feed air into the aeration tank (3).

7. The high-efficiency step-type biofilter integrated device according to claim 1, characterized in that: The drainage pool (4) comprises a baffle (41), the baffle (41) being located in the middle of the drainage pool (4), and the baffle (41) extending upward from the bottom end of the drainage pool (4) to divide the drainage pool (4) into two cavities; the two cavities are respectively a backwash drainage cavity (42) and a drainage cavity (43), and the upper end of the drainage pool (4) is a cavity that interconnects the backwash drainage cavity (42) and the drainage cavity (43).

8. The high-efficiency step-type biofilter integrated device according to claim 7, characterized in that: A backwash drainage pipe is also provided at the lower end of the backwash drainage chamber (42), the backwash drainage pipe leads to the outside of the drainage pool (4), and a backwash drainage valve (421) is provided on the backwash drainage pipe to control the backwash drainage chamber (42) to drain water outward; a drainage pipe is also provided at the lower end of the drainage chamber (43), the drainage pipe leads to the outside of the drainage pool (4), and a drainage valve (431) is provided on the drainage pipe to control the drainage chamber (43) to drain water outward.

9. The high-efficiency step-type biofilter integrated device according to claim 1, characterized in that: A pipe is connected to one side of the upper end of the sedimentation tank (1), and a water pump (11) is arranged outside the pipe to extract the sewage after sedimentation at the upper end of the sedimentation tank (1) and discharge it into the pretreatment tank (2) at the rear side.

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