CN210214910U - Biological filter tube and water treatment unit - Google Patents

Abstract

The utility model discloses a biological filter tube and a water treatment unit, wherein the biological filter tube comprises a tube body, at least one layer of column net, two port buckle discs and a plurality of filter materials; the pipe body is hollow; the column net is sleeved in the pipe body, and two ends of the column net are respectively fixed with the two port buckling discs; the port buckling discs are hollowed out, and the two port buckling discs are respectively fixed in the two end parts of the pipe body; the surface of the column net is in a net shape, and the filter material is fixed in the meshes of the column net. The utility model has the advantages of flexible application, low cost and the like.

Description

Biological filter tube and water treatment unit

Technical Field

The utility model belongs to the water treatment field relates to a chimney filter, especially relates to a biological chimney filter and water treatment unit.

Background

The primary sedimentation tank 1 'unit, the aeration biological tank unit and the secondary sedimentation tank 3' unit are traditional water treatment process engineering, wherein the aeration biological tank unit usually adopts a tower type biological filter. The main technological features of the tower type biological filter are that the load born is high, the biofilm grows rapidly under the high organic matter load, and the biofilm is washed by strong water power under the high hydraulic load, so that the biofilm falls off and is renewed continuously. However, when the terrain is flat, the cost for pumping and lifting sewage is high, and the operation and management are not convenient enough due to the high filter tank. Moreover, for mountainous regions with uneven terrain, the tower type biological filter tank is difficult to construct, and the damage probability is high in natural disasters. In addition, for small towns or rural areas, the tower type biological filter is high in construction cost and high in technical difficulty.

SUMMERY OF THE UTILITY MODEL

The utility model provides a biological filter tube and a water treatment unit, which overcome the defects of the prior art.

In order to achieve the purpose, the utility model provides a biological filter tube, which comprises a tube body, at least one layer of column net, two port buckle discs and a plurality of filter materials; the pipe body is hollow; the column net is sleeved in the pipe body, and two ends of the column net are respectively fixed with the two port buckling discs; the port buckling discs are hollowed out, and the two port buckling discs are respectively fixed in the two end parts of the pipe body; the surface of the column net is in a net shape, and the filter material is fixed in the meshes of the column net.

Further, the utility model provides a biological filter tube can also have such characteristic: the number of layers of the column net is multiple, the inner diameters of the column net are sequentially increased, and the column net with the smaller inner diameter is sleeved in the column net with the larger inner diameter.

Further, the utility model provides a biological filter tube can also have such characteristic: the port buckling disc is provided with a port inner ring, a port outer ring, a plurality of port supporting connecting rods and a plurality of port arc-shaped rod groups; the port inner ring is positioned in the port outer ring, the port support connecting rod is positioned between the port inner ring and the port outer ring, one end of the port support connecting rod is fixedly connected with the port inner ring, and the other end of the port support connecting rod is fixedly connected with the port outer ring; the port arc rod group comprises a plurality of port arc rods which are fixed between two adjacent port supporting connecting rods, and the port arc rods in the same group of port arc rod groups form a continuous or discontinuous annular structure; the plurality of groups of port arc-shaped rod groups are positioned between the port inner ring and the port outer ring and are sequentially arranged from inside to outside by taking the port inner ring as a center; the inner ring wall of the port inner ring is provided with a plurality of port inner ring arc-shaped rods fixedly arranged along the wall; in the port buckle disc, along the direction from inside to outside, a port inner ring arc-shaped rod and a plurality of groups of port arc-shaped rod groups of a port inner ring are sequentially and respectively in one-to-one correspondence with a plurality of sleeved column nets; the port inner ring arc-shaped rod and one side surface of the port arc-shaped rod are respectively provided with a port clamping groove arranged along the length direction of the port inner ring arc-shaped rod and are respectively matched with the annular end parts of the corresponding column nets, and the annular end parts of the corresponding column nets can be clamped into the port clamping grooves and are fixed with the port clamping discs.

Further, the utility model provides a biological filter tube can also have such characteristic: wherein, the number of layers of the column net is one; the port buckling disc is provided with a port inner ring, a port outer ring and a plurality of port supporting connecting rods, the port inner ring is positioned in the port outer ring, the port supporting connecting rods are positioned between the port inner ring and the port outer ring, one end of each port supporting connecting rod is fixedly connected with the port inner ring, and the other end of each port supporting connecting rod is fixedly connected with the port outer ring; the inner ring wall of the port inner ring is provided with a plurality of port inner ring arc-shaped rods fixedly arranged along the wall and corresponding to the position of the column net; one side surface of the port inner ring arc-shaped rod is provided with a port clamping groove arranged along the length direction of the port inner ring arc-shaped rod, the port clamping groove is matched with the annular end part of the column net, and the annular end part of the column net can be fixedly clamped in the port clamping groove.

Further, the utility model provides a biological filter tube can also have such characteristic: the connecting plate also comprises a plurality of connecting plates; the column net is provided with a plurality of column net segments which are sequentially connected end to end through connecting discs; each column net section in the column nets of a plurality of layers of sleeved columns corresponds to each other, and the column net sections of different column nets at the same relative position are connected with the column net sections at the adjacent positions through the same connecting disc.

Further, the utility model provides a biological filter tube can also have such characteristic: the connecting disc comprises a first connecting buckle disc and a second connecting buckle disc which are hollowed out, the first connecting buckle disc is fixedly connected with the end part of each column network segment sleeved at the same position, the second connecting buckle disc is fixedly connected with the end part of each column network segment sleeved at the adjacent position, the first connecting buckle disc is fixedly connected with the second connecting buckle disc, and the column network segments sleeved at the two adjacent positions are fixedly connected; the first connecting buckle disc is provided with a first connecting inner ring, a first connecting outer ring, a plurality of first connecting support connecting rods and a plurality of first connecting arc-shaped rod groups; the first connecting inner ring is positioned in the first connecting outer ring, the first connecting support connecting rod is positioned between the first connecting inner ring and the first connecting outer ring, one end of the first connecting support connecting rod is fixedly connected with the first connecting inner ring, and the other end of the first connecting support connecting rod is fixedly connected with the first connecting outer ring; the first connecting arc rod group comprises a plurality of first connecting arc rods which are fixed between two adjacent first connecting and supporting connecting rods, and the first connecting arc rods in the same group of first connecting arc rod groups form a discontinuous annular structure; the plurality of groups of first connecting arc-shaped rod groups are positioned between the first connecting inner ring and the first connecting outer ring and are sequentially arranged from inside to outside by taking the first connecting inner ring as a center; the first connecting arc-shaped rods in the first connecting arc-shaped rod groups are equal in number and correspond to one another; the inner ring wall of the first connecting inner ring is provided with a plurality of first connecting inner ring arc-shaped rods fixedly arranged along the wall, the number of the first connecting inner ring arc-shaped rods is equal to that of the first connecting arc-shaped rods in the same group of first connecting arc-shaped rod groups, and the first connecting inner ring arc-shaped rods are in one-to-one correspondence; in the first connecting buckle disc, along the direction from inside to outside, a first connecting inner ring arc-shaped rod of a first connecting inner ring and a plurality of groups of first connecting arc-shaped rod groups sequentially correspond to a plurality of layers of sleeved column net sections at the same position one by one respectively; one side surface of each of the first connecting inner ring arc-shaped rod and the first connecting arc-shaped rod is provided with a first connecting clamping groove arranged along the length direction of the first connecting inner ring arc-shaped rod and matched with the annular end part of the corresponding column network segment at the same position respectively, and the annular end part of the corresponding column network segment can be clamped into each first connecting clamping groove and fixed with the first connecting clamping disc; in the first connecting buckle disc, the other side surfaces of the first connecting inner ring arc-shaped rod and the first connecting arc-shaped rod are provided with first buckles arranged along the length direction of the first connecting inner ring arc-shaped rod and the first connecting arc-shaped rod; the section of the first buckle is in a hook shape and is provided with a first vertical wall and a first horizontal wall which are vertical to each other, one side of the first vertical wall is fixedly connected with the side surface of the rod body, the other side of the first vertical wall is fixedly connected with one side of the first horizontal wall, and the inner surface of the first horizontal wall is provided with a buckle groove; the second connecting buckle disc is provided with a second connecting inner ring, a second connecting outer ring, a plurality of second connecting support connecting rods and a plurality of groups of second connecting arc-shaped rod groups, wherein the second connecting inner ring corresponds to each structure of the first connecting buckle disc; the second connecting inner ring is positioned in the second connecting outer ring, the second connecting and supporting connecting rod is positioned between the second connecting inner ring and the second connecting outer ring, one end of the second connecting and supporting connecting rod is fixedly connected with the second connecting inner ring, and the other end of the second connecting and supporting connecting rod is fixedly connected with the second connecting outer ring; the second connecting arc rod group comprises a plurality of second connecting arc rods which are fixed between two adjacent second connecting and supporting connecting rods, and the second connecting arc rods in the same group of second connecting arc rod groups form a discontinuous annular structure; the plurality of groups of second connecting arc-shaped rod groups are positioned between the second connecting inner ring and the second connecting outer ring and are sequentially arranged from inside to outside by taking the second connecting inner ring as a center; the number of the second connecting arc-shaped rods in the plurality of groups of second connecting arc-shaped rod groups is equal and is in one-to-one correspondence; the inner ring wall of the second connecting inner ring is provided with a plurality of second connecting inner ring arc-shaped rods fixedly arranged along the wall, the number of the second connecting inner ring arc-shaped rods is equal to that of the second connecting arc-shaped rods in the same group of second connecting arc-shaped rod groups, and the second connecting inner ring arc-shaped rods are in one-to-one correspondence; in the second connecting buckle disc, along the direction from inside to outside, a second connecting inner ring arc-shaped rod of a second connecting inner ring and a plurality of groups of second connecting arc-shaped rod groups sequentially correspond to a plurality of sleeved column net sections at the same position one by one respectively; one side surface of each of the second connecting inner ring arc-shaped rod and the second connecting arc-shaped rod is provided with a second connecting clamping groove arranged along the length direction of the second connecting inner ring arc-shaped rod and the second connecting arc-shaped rod, the second connecting clamping grooves are respectively matched with the annular end parts of the corresponding column network segments at the same position, and the annular end parts of the corresponding column network segments can be clamped into the second connecting clamping grooves and are fixed with the second connecting clamping discs; in the second connecting buckle disc, the other side surfaces of the second connecting inner ring arc-shaped rod and the second connecting arc-shaped rod are provided with second buckles arranged along the length direction of the second connecting inner ring arc-shaped rod and the second connecting arc-shaped rod; the section of the second buckle is in a hook shape and is provided with a second vertical wall and a second horizontal wall which are vertical to each other, one side of the second vertical wall is fixedly connected with the side surface of the rod body, the other side of the second vertical wall is fixedly connected with one side of the second horizontal wall, and the inner surface of the second horizontal wall is provided with a buckle bulge which is matched with the buckle groove of the first connecting buckle disc; the sum of the first connecting arc-shaped rods in the first connecting arc-shaped rod group is equal to the sum of the second connecting arc-shaped rods in the second connecting arc-shaped rod group, and the first connecting arc-shaped rods and the second connecting arc-shaped rods are matched in a one-to-one correspondence manner; the arc length of the first connecting arc-shaped rods is not more than the arc length of the intervals between the first connecting arc-shaped rods, and the arc length of the first connecting inner ring arc-shaped rods is not more than the arc length of the intervals between the first connecting inner ring arc-shaped rods; the second buckle of second connection buckle dish and the first buckle phase-match of first connection buckle dish, when second connection buckle dish and first connection buckle dish were placed relatively, the corresponding second buckle in position and first buckle can insert fixedly each other, and the buckle arch of second buckle inserts in the buckle recess of first buckle, second connection buckle dish and first connection buckle dish fixed connection.

Further, the utility model provides a biological filter tube can also have such characteristic: the outer wall of the port buckling disc is provided with a plurality of raised sections which are arranged along the wall at intervals; the inner wall of the end part of the pipe body is provided with a plurality of placing grooves which are arranged at intervals along the wall, partition walls are arranged between adjacent placing grooves, and the placing grooves and the partition walls are equal to the number of the protruding sections of the port buckle disc and are in one-to-one correspondence; the inner wall of the partition wall is provided with a pipe body clamping groove arranged along the length of the partition wall and matched with the protruding section, and the protruding section can be inserted into the pipe body clamping groove; the end opening buckle disc is arranged in the end part of the pipe body, the protruding sections are respectively arranged in the placing grooves, the end opening buckle disc is rotated, the protruding sections are inserted into the pipe body clamping grooves adjacent to the placing grooves from the end part, and the end opening buckle disc is fixed with the pipe body.

Further, the utility model provides a biological filter tube can also have such characteristic: in the cross section of the convex section, the outer side part is semicircular, the inner side part is rectangular, the inner side part is connected with the linear side of the outer side part, and the width of the linear side is greater than that of the inner side part; the cross section of the pipe body clamping groove is the same as the cross section of the protruding section in shape and size, and the protruding section can be wedged into the pipe body clamping groove.

Further, the utility model provides a biological filter tube can also have such characteristic: wherein, the filter material has two hemispheres and connecting portion between it, and the cross-section of connecting portion is less than the basal plane of hemispheres, and the filter material is elastic material, compresses a hemisphere and fills in the mesh that passes the column net, and this hemisphere recovers, and the connecting portion card of filter material is in the mesh of column net, and a hemisphere is located the inboard of this column net, and another hemisphere is located the outside of this column net.

The utility model also provides a water treatment unit which is arranged between the primary sedimentation tank and the secondary sedimentation tank and comprises a water inlet road, a plurality of groups of branch pipeline groups, an aeration device, a flushing pipeline and a return pipeline; one end of the water inlet road is communicated with the primary sedimentation tank, the other end of the water inlet road is provided with a plurality of water inlet road branches which are connected in parallel, the number of the water inlet road branches is equal to that of the branch pipeline groups, and the water inlet road branches are in one-to-one correspondence; a branch valve is arranged on each water inlet road branch; the branch pipeline group comprises a branch pipeline and a plurality of biological filter tubes; one end of the branch pipeline is communicated with the corresponding water inlet road branch of the group; one end of each biological filter tube is communicated with the branch pipeline, the other end of each biological filter tube is communicated with the secondary sedimentation tank, and the biological filter tubes are connected in parallel; the aeration device is arranged on the water inlet road and is arranged on the front side of the branch of the water inlet road along the water flow direction; one end of the flushing pipeline is communicated with the secondary sedimentation tank, the other end of the flushing pipeline is provided with a plurality of flushing pipeline branches which are connected in parallel, the number of the flushing pipeline branches is equal to that of the branch pipeline groups, the flushing pipeline branches correspond to the branch pipelines of the branch pipeline groups one by one, and the flushing pipeline branches are communicated with the branch pipelines of the corresponding branch pipeline groups; each flushing pipeline branch is provided with a flushing branch valve; the flushing pipeline is provided with a flushing pump and is arranged on the front side of the flushing pipeline branch along the water flowing direction; one end of the return pipeline is communicated with the secondary sedimentation tank, the other end of the return pipeline is communicated with the water inlet road, and the communicated position is positioned on the front side of the aeration device.

The beneficial effects of the utility model reside in that: (1) the pipeline type pipeline. (2) The double-pipeline alternate operation ensures that the facilities can still continuously operate when the pipelines are washed, thereby ensuring the treatment efficiency and preventing the occurrence of sudden situations. And (3) the occupied area is small, and the cost is low. Can be widely applied to small towns or remote areas as a small device. (4) The process is simple and the technical difficulty is small. (5) The problems of pollution treatment and resource waste under low hydraulic load are solved. (6) The length of the pipeline can be increased in time according to the requirement, the method is suitable for local development, and no additional treatment facility is required.

Drawings

FIG. 1 is a schematic structural view of a biological filter tube;

FIG. 2a is a schematic structural view of a pipe body and a net of a port buckle disk;

FIG. 2b is a schematic structural view of an inner ring arcuate rod and an arcuate rod portion of a port in a port snap plate;

FIG. 2c is a schematic view of the slot portion of the upper port on the inner ring arc rod of the port snap disk;

FIG. 2d is a schematic view of the configuration of the port slot portion on the port arcuate bar in the port snap plate;

FIG. 2e is a schematic structural view of the inner wall of the end of the tube;

FIG. 2f is a partial schematic view of the inner wall of the end of the tube;

FIG. 2g is a schematic structural view of the protruding section of the port snap disk inserted into the tube body engaging groove of the tube body;

FIG. 2h is a schematic view of the structure in which the protruding section of the port snap disk is inserted into the tube body snap groove of the tube body;

FIG. 3a is a schematic diagram of a separated structure of a connecting disc;

FIG. 3b is a schematic view of the combination structure of the connecting disc;

FIG. 3c is a partial schematic structural view of the first and second connecting arcuate rails when the disk is engaged;

FIG. 3d is a partial structural view of the first coupling inner race and the second coupling inner race when the coupling discs are combined;

FIG. 3e is a schematic partial structural view of two adjacent column segments in combination with a connector disc;

FIG. 4a is a schematic structural diagram of a part of a column net and a filter material;

FIG. 4b is a schematic diagram of the filter media construction;

FIG. 5 is a schematic view of a water treatment unit.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1, the utility model provides a biological filter tube, which comprises a tube body 1, a three-layer column net 2, two port buckle discs 3, a plurality of connecting discs 4 and a plurality of filter materials 5.

The tube body 1 is hollow.

The column net 2 is sleeved in the pipe body 1, and two ends of the column net are respectively fixed with the two port buckling discs 3. The inner diameters of the multiple layers of column nets 2 are sequentially increased in an increasing mode, and the column net 2 with the smaller inner diameter is sleeved in the column net 2 with the larger inner diameter.

The port buckle discs 3 are hollowed out, and the two port buckle discs 3 are respectively fixed in two end parts of the pipe body 1, so that the relative positions between the column nets 2 and the pipe body 1 are fixed.

The surface of the column net 2 is in a net shape, and the filter material 5 is a porous filter material and is fixed in the meshes of the column net 2.

As shown in fig. 2a, the port snap disk 3 has a port inner ring 31, a port outer ring 32, eight port support links 33 and two sets of port arc rod sets.

The port inner ring 31 is located in the port outer ring 32, the port support link 33 is located between the port inner ring 31 and the port outer ring 32, one end is fixedly connected with the port inner ring 31, and the other end is fixedly connected with the port outer ring 32.

The port arc rod group includes four port arc rods 341 fixed between two adjacent port support links 33, and the port arc rods 341 in the same group of port arc rod groups form a discontinuous annular structure. That is, each port arc 341 is fixed between two adjacent port support links 33, and the port arc 341 is spaced apart.

The two sets of port arc rod sets are located between the port inner ring 31 and the port outer ring 32, and are arranged from inside to outside in sequence by taking the port inner ring 31 as a center.

In this embodiment, the port support links and the port arc-shaped rod groups may be in other numbers, and may be set according to the filtering requirements and the number of the nets. In the same group of port arc rod groups, the port arc rods arranged between two adjacent port support connecting rods can also form a continuous annular structure.

As shown in fig. 2b, the inner wall of the port inner ring 31 has four port inner ring arc rods 342 fixedly arranged along the wall, and the number of the port inner ring arc rods 342 is equal to that of the port arc rods 341 in the same group of the port arc rods, and the port inner ring arc rods correspond to one another.

In the port snap disc 3, along the direction from inside to outside, the port inner ring arc-shaped rods 342 and the plurality of port arc-shaped rod groups of the port inner ring 31 are respectively in one-to-one correspondence with the plurality of sleeved column nets 2 in sequence.

As shown in fig. 2c and 2d, one side of each of the port inner ring arc-shaped rod 342 and the port arc-shaped rod 341 has a port clamping groove 343 arranged along the length direction thereof, which is respectively matched with the annular end of the corresponding net 2, and a part of the annular end of the corresponding net 2 can be clamped into the port clamping groove 343, thereby being fixed with the port clamping disk 3. Specifically, the positions of the three layers of column nets 2 and the positions of the port inner ring arc-shaped rods 342 of the port inner ring 31 and the two groups of port arc-shaped rods are in one-to-one correspondence along the direction from inside to outside, the cross-sectional shape and the size of the annular end part of each column net 2 are matched with the port clamping grooves 343, part of the annular end part of each column net 2 can be fixedly clamped into the corresponding port clamping grooves 343, and the part of the annular end part of one column net 2 corresponding to the corresponding port clamping grooves 343 is clamped into the port clamping grooves 343. Both ends of the port arc-shaped rod 341 are connected and continuous with the port support connecting rods 33 on both sides thereof, so both ends of the port clamping groove 343 are also continued to the port support connecting rods 33, and the port clamping groove 343 is a groove body with both ends open, so that part of the annular end part of the column net 2 can be clamped therein.

As shown in fig. 2e-2h, the outer wall of the port snap plate 3 has four raised sections 35 spaced along the wall.

The inner wall of the end part of the pipe body 1 is provided with four sections of placing grooves 11 which are arranged along the wall at intervals. Between the adjacent placing grooves 11 is a partition wall 12. The placing grooves 11 and the partition walls 12 are equal in number to the protruding sections 35 of the port snap discs 3 and are in one-to-one correspondence.

The inner wall of the partition wall 12 has a tube body engaging groove 121 formed along the length thereof to match the protruding section 35, and the protruding section 35 is inserted into the tube body engaging groove 121.

The arc length of the placing groove 11 is not less than the arc length of the convex section 35, so that the convex section 35 can be placed in the placing groove 11.

The port buckle disc 3 is arranged in the end part of the pipe body 1, the protruding sections 35 are respectively arranged in the placing grooves 11, the port buckle disc 3 is rotated, the protruding sections 35 are inserted into the pipe body clamping grooves 121 of the partition walls 12 adjacent to the placing grooves 11 from the end part, and the port buckle disc 3 is fixed with the pipe body 1.

Specifically, in the cross section of the protruding section 35, the outer portion is semicircular, the inner portion is rectangular, the inner portion is connected to the linear side of the outer portion, and the width of the linear side is greater than that of the inner portion, so that the protruding section 35 is stably clamped in the tube body clamping groove 121. The cross section of the pipe body clamping groove 121 is the same as the cross section of the protruding section 35 in shape and size, and the protruding section 35 can be wedged into the pipe body clamping groove 121.

In this embodiment, the protruding section of port buckle dish also can be other quantity, can set up according to the fixed strength demand, and is corresponding, and the quantity of placing recess and spaced wall of body tip equals with it, and the one-to-one.

As shown in fig. 1, the column net 2 has several column net segments 21, which are connected end to end in sequence by connecting discs 4.

The column net segments 21 in the three layers of column nets 2 are corresponding, namely, the positions are consistent. The column network segments 21 of different column networks 2 at the same relative position are connected with the column network segments 21 at the adjacent positions through the same connecting disc 4.

As shown in fig. 3a and 3b, the connecting plate 4 includes a first connecting snap plate 41 and a second connecting snap plate 42 that are hollowed out. The first connecting buckle disc 41 is fixedly connected with the end part of each column network segment sleeved at the same position, the second connecting buckle disc 42 is fixedly connected with the end part of each column network segment sleeved at the adjacent position, and the first connecting buckle disc 41 is fixedly connected with the second connecting buckle disc 42, so that the sleeved column network segments at the two adjacent positions are fixedly connected.

Specifically, as shown in fig. 3a to 3e, the first coupling chuck 41 has a first coupling inner ring 411, a first coupling outer ring 412, eight first coupling support links 413, and two first coupling arc bar groups.

The first connection inner ring 411 is located inside the first connection outer ring 412, and the first connection support link 413 is located between the first connection inner ring 411 and the first connection outer ring 412, and has one end fixedly connected to the first connection inner ring 411 and the other end fixedly connected to the first connection outer ring 412.

The first connecting arc-shaped rod group comprises four first connecting arc-shaped rods 4141 fixed between two adjacent first connecting support connecting rods 413, and the first connecting arc-shaped rods in the same group of first connecting arc-shaped rod group form a discontinuous annular structure, namely the first connecting arc-shaped rods 4141 in the same group of first connecting arc-shaped rod group are arranged at intervals and are discontinuous.

The two first connecting arc rod sets are located between the first connecting inner ring 411 and the first connecting outer ring 412, and are arranged in sequence from inside to outside with the first connecting inner ring 411 as the center.

The first connecting arc-shaped rods 4141 in the two first connecting arc-shaped rod groups are equal in number and correspond to one another.

The inner wall of the first inner connecting ring 411 has four first inner connecting ring arc-shaped rods 4142 fixedly arranged along the wall, and the number of the first inner connecting ring arc-shaped rods 4141 in the same group of first inner connecting ring arc-shaped rods is equal and corresponding to one another.

In the first connecting snap disc 41, the first connecting inner ring arc-shaped rods 4142 of the first connecting inner ring 411 and the two first connecting arc-shaped rod groups sequentially correspond to the three column segments 21 (of different column networks 2) sleeved with each other at the same position one by one respectively along the inside-out direction.

One side surface of each of the first connecting inner ring arc-shaped rod 4142 and the first connecting arc-shaped rod 4141 is provided with a first connecting clamping groove 4143 arranged along the length direction thereof, which is respectively matched with the annular end portion of the corresponding column segment 21 at the same position, and part of the annular end portion of the corresponding column segment 21 can be clamped into each first connecting clamping groove 4143, thereby being fixed with the first connecting clamping disk 41. Specifically, each column section 21 at the same position of the plurality of column meshes 2 corresponds to the first connection inner ring arc-shaped rods 4142 of the first connection inner ring 411 and the first connection arc-shaped rod groups of the plurality of groups one by one along the inside-outside direction, the cross-sectional shape and size of the annular end of the column mesh section 21 are matched with the first connection clamping groove 4143, part of the annular end of the column section 21 can be fixedly clamped into the corresponding first connection clamping groove 4143, and the part is the part corresponding to the corresponding first connection clamping groove 4143 in the annular end of one column section 21, namely the part clamped into the first connection clamping groove 4143. Both ends of the first inner ring-shaped connecting rod 4142 are continuously connected to the first connecting support links 413 at both sides thereof, and thus both ends of the first connecting groove 4143 are also continued to the first connecting support links 413, and the first connecting groove 4143 is a groove body with both ends open, so that a part of the ring-shaped end portion of the column section 21 can be engaged therein.

In the first coupling catch plate 41, the other side surfaces of the first coupling inner ring arc-shaped rod 4142 and the first coupling arc-shaped rod 4141 each have a first catch 4144 provided along the length direction thereof.

The first hook 4144 has a hook-shaped cross section and includes a first vertical wall 41441 and a first horizontal wall 41442 perpendicular to each other, one side of the first vertical wall 41441 is fixedly connected to a side of the rod (of the first inner ring-connected arc-shaped rod 4142 or the first connecting arc-shaped rod 4141), the other side is fixedly connected to one side of the first horizontal wall 41442, and the inner surface of the first horizontal wall 41442 has a hook groove 41443.

The second coupling chuck 42 has substantially the same structure as the first coupling chuck 41, and has a second coupling inner ring 421, a second coupling outer ring 422, eight second coupling support links 423, and two second coupling arc-shaped rod groups corresponding to the respective structures of the first coupling chuck 41.

The second connection inner ring 421 is located in the second connection outer ring 422, the second connection support link 423 is located between the second connection inner ring 421 and the second connection outer ring 422, one end of the second connection support link is fixedly connected with the second connection inner ring 421, and the other end of the second connection support link is fixedly connected with the second connection outer ring 422.

The second connecting arc rod group comprises four second connecting arc rods 4241 which are fixed between two adjacent second connecting support connecting rods 423, and the second connecting arc rods in the same group of second connecting arc rod group form a discontinuous annular structure, namely the second connecting arc rods 4241 in the same group of second connecting arc rod group are arranged at intervals and are discontinuous.

The two second connecting arc rod sets are located between the second connecting inner ring 421 and the second connecting outer ring 422, and are arranged in sequence from inside to outside by taking the second connecting inner ring 421 as a center.

The number of the second connecting arc rods 4241 in the two groups of second connecting arc rod groups is equal and is in one-to-one correspondence.

The inner ring wall of the second connecting inner ring 421 is provided with four second connecting inner ring arc rods 4242 fixedly arranged along the wall, and the number of the second connecting inner ring arc rods 4242 is equal to that of the second connecting arc rods 4241 in the same group of second connecting arc rod groups, and the second connecting arc rods 4241 are in one-to-one correspondence.

In the second connecting snap disk 42, along the inside-out direction, the second connecting inner ring arc-shaped rods 4242 of the second connecting inner ring 421 and the two second connecting arc-shaped rod groups sequentially correspond to a plurality of column network segments 21 (of different column networks 2) sleeved with each other at the same position one by one, respectively.

One side surface of each of the second connecting inner ring arc-shaped rod 4242 and the second connecting arc-shaped rod 4241 is provided with a second connecting clamping groove 4243 arranged along the length direction thereof, and the second connecting clamping grooves 4243 are respectively matched with the annular end parts of the corresponding column segment 21 at the same position, and part of the annular end parts of the corresponding column segment 21 can be clamped into the second connecting clamping grooves 4243 so as to be fixed with the second connecting clamping disc 42. Specifically, in the inside-out direction, each column network segment 21 at the same position of the plurality of column networks 2 corresponds to the second connection inner ring arc-shaped rods 4242 of the second connection inner ring 421 and the positions of the plurality of groups of second connection arc-shaped rod groups one by one, the cross-sectional shape and the size of the annular end of the column network segment 21 are matched with those of the second connection clamping grooves 4243, part of the annular end of the column network segment 21 can be fixedly clamped into the corresponding second connection clamping grooves 4243, and the part is the part corresponding to the corresponding second connection clamping groove 4243 in the annular end of one column network segment 21, that is, the part clamped into the second connection clamping grooves 4243. Both ends of the second connecting inner ring arc-shaped rod 4242 are connected and continuous with the second connecting and supporting connecting rods 423 on both sides thereof, so both ends of the second connecting clamping groove 4243 are also continued to the second connecting and supporting connecting rods 423, and the second connecting clamping groove 4243 is a groove body with openings at both ends, so that part of the annular end part of the column network segment 21 can be clamped therein.

In the second coupling catch plate 42, the other side surfaces of the second coupling inner ring arc-shaped rod 4242 and the second coupling arc-shaped rod 4241 each have a second catch 4244 provided along the length direction thereof.

The second buckle 4244 has a hook-shaped cross section and comprises a second vertical wall 42441 and a second horizontal wall 42442 which are perpendicular to each other, one side of the second vertical wall 42441 is fixedly connected with the side surface of the rod body (of the second connecting inner ring arc rod 4242 or the second connecting arc rod 4241), the other side of the second vertical wall 42441 is fixedly connected with one side of the second horizontal wall 42442, and the inner surface of the second horizontal wall 42442 is provided with a buckle protrusion 42443 which is matched with the buckle groove 41443 of the first connecting buckle disk 41.

That is, the second coupling snap disk 42 is substantially identical to the first coupling snap disk 41 in respective structures except that the inner surface of the first horizontal wall 41442 of the first snap 4144 of the first coupling snap disk 41 has a snap groove 41443, and the inner surface of the second horizontal wall 42442 of the second snap 4244 of the second coupling snap disk 42 has a snap protrusion 42443.

The sum of the number of the first connecting arc rods 4141 in the first connecting arc rod group is equal to the sum of the number of the second connecting arc rods 4241 in the second connecting arc rod group, and the first connecting arc rods 4141 and the second connecting arc rods 4241 are matched in a one-to-one correspondence manner, that is, the relative positions and the arc lengths of the four first connecting arc rods 4141 and the four second connecting arc rods 4241 are matched.

The arc length of first connection arc pole 4141 is not more than the alternate arc length between first connection arc pole 4141, the arc length of first connection inner circle arc pole 4142 is not more than the alternate arc length between first connection inner circle arc pole 4142, thereby when making first connection buckle dish 41 and second connection buckle dish 42 for the combination, the two can staggered placement, namely first connection arc pole 4141 of first connection buckle dish 41 can arrange interval space department between two adjacent second connection arc poles 4241 of second connection buckle dish 42 in, first connection inner circle arc pole 4142 can arrange interval space department between two adjacent second connection inner circle arc poles 4242 in, thereby realize subsequent interlude.

The second buckle 4244 of the second connecting buckle disk 42 is matched with the first buckle 4144 of the first connecting buckle disk 41, and when the second connecting buckle disk 42 is oppositely arranged with the first connecting buckle disk 41, the second buckle 4244 and the first buckle 4144 which are corresponding in position can be mutually inserted and fixed from the end part. After insertion, second horizontal wall 42442 of second catch 4244 is inserted inside first horizontal wall 41442 of first catch 4144, and first horizontal wall 41442 of first catch 4144 is inserted inside second horizontal wall 42442 of second catch 4244. The catch projection 42443 of the second catch 4244 is inserted into the catch groove 41443 of the first catch 4144, and the second connection catch plate 42 is fixedly connected to the first connection catch plate 41.

In this embodiment, the first connecting support link and the first connecting arc-shaped rod group may be in other numbers, and may be set according to the filtering requirement and the number of the net columns. Correspondingly, the second connecting and supporting connecting rod and the second connecting arc-shaped rod group correspond to each other.

As shown in fig. 4a and 4b, the filter material 5 has two hemispherical portions 51 and a connecting portion 52 therebetween. The connecting portion 52 has a cross section smaller than the bottom plane of the hemispherical portion 51. The filter material 5 is an elastic material. One hemispherical portion 51 is compressed and inserted through the meshes of the net 2, the hemispherical portion 51 is restored, the connecting portion 52 of the filter material is caught in the meshes of the net, and at this time, one hemispherical portion 51 is positioned at the inner side of the net, the other hemispherical portion 51 is positioned at the outer side of the net, and the filter material 5 is fixed in the meshes of the net 2.

The filter material 5 is matched with the meshes of the column net 2, and the sizes of the hemispherical part 51 and the connecting part 52 are changed along with the aperture of the meshes, so that the filter material 5 can be always placed in the column net 2 with the meshes with different apertures, and the filter materials with different sizes can better treat different kinds of pollutants in water.

The biological filter tube can adjust the layer number of the column net and the length of the column net according to the water treatment load, wherein the length of the column net can be adjusted by connecting column net segments with different numbers.

In this embodiment, the net may be one layer or multiple layers.

When the biological filter tube comprises a layer of column net: the port snap disc is also provided with a port inner ring, a port outer ring and a plurality of port supporting connecting rods, correspondingly, the port inner ring is positioned in the port outer ring, the port supporting connecting rods are positioned between the port inner ring and the port outer ring, one end of each port supporting connecting rod is fixedly connected with the port inner ring, and the other end of each port supporting connecting rod is fixedly connected with the port outer ring. The inner ring wall of the port inner ring is provided with a plurality of port inner ring arc-shaped rods which are fixedly arranged along the wall and correspond to the position of the column net. One side surface of the port inner ring arc-shaped rod is provided with a port clamping groove arranged along the length direction of the port inner ring arc-shaped rod, the port clamping groove is matched with the annular end part of the column net, and the annular end part of the column net can be fixedly clamped in the port clamping groove 343.

When the biological filter tube comprises a plurality of layers of column nets, correspondingly, a plurality of port arc-shaped rod groups in the port buckling disc are also provided, and the number of the port arc-shaped rod groups is one less than the number of the layers of the column nets; in the connecting disc, the first connecting arc rod group and the second connecting arc rod group are also in multiple groups, and the number of the groups is one less than the number of layers of the column net.

As shown in fig. 5, the utility model also provides a water treatment unit, which is arranged between the primary sedimentation tank 1 ' and the secondary sedimentation tank 3 ', and comprises a water inlet passage 21 ', two branch pipe groups 22 ', an aeration device 23 ', a flushing pipe 24 ' and a return pipe 25 '.

One end of the water inlet path 21 ' is communicated with the primary sedimentation tank 1 ', and the other end is provided with two water inlet path branches 211 ' which are connected in parallel. The number of the water inlet road branches 211 'is equal to the number of the branch pipe groups 22', and corresponds to one another. A branch valve 212 'is arranged on each water inlet road branch 211'. The water inlet road 21' may be a closed pipeline, or may be a channel or a water channel.

The branch conduit set 22 ' includes a branch conduit 221 ' and a plurality of bio-filter tubes 222 ' as described above. One end of the branch pipe 221 'communicates with the corresponding water inlet road branch 211' of the present group. One end of the biological filter tube 222 'is communicated with the branch pipeline 221', the other end is communicated with the secondary sedimentation tank 3 ', and a plurality of biological filter tubes 222' are connected in parallel.

The aeration apparatus 23 ' is provided on the intake passage 21 ' at the front side of the intake passage branch 211 ' in the water flowing direction.

One end of the flushing pipe 24 ' is communicated with the secondary sedimentation tank 3 ' and the other end is provided with two parallel flushing pipe branches 241 '. The number of the flushing pipe branches 241 'is equal to the number of the branch pipe groups 22', and corresponds to one. The flushing duct branch 241 ' communicates with the branch duct 221 ' of its corresponding branch duct group 22 '. A flushing branch valve 242 'is provided on each flushing pipe branch 241'. The flushing pipe 24 ' is provided with a flushing pump 243 ' arranged on the front side of the flushing pipe branch 241 ' in the direction of water flow.

One end of the return pipeline 25 'is communicated with the secondary sedimentation tank 3', the other end is communicated with the water inlet passage 21 ', and the communicated position is positioned at the front side of the aeration device 23'.

In this embodiment, the number of the branch pipe groups 22' may be plural, and may be set according to the water treatment load, and accordingly, the number of the water inlet path branches and the number of the flushing pipe branches may be changed.

During operation, the sewage in the primary sedimentation tank 1 'is introduced into the water treatment unit through the water inlet path 21', is aerated through the aeration device 23 ', then flows into the corresponding branch pipeline group 22' from each water inlet path branch 211 ', is treated through the biological filter tubes 222' in the branch pipeline group 22 ', and then flows into the secondary sedimentation tank 3'. In the treatment process, the branch valve 212' can be opened and closed according to the water treatment load so as to realize convenient adjustment of different treatment loads.

When the biological filter tube 222 ' needs to be cleaned, the flushing pipeline 24 ' flushes the aged membrane in the biological filter tube 222 ' at high pressure through the flushing pump 243 ', the aged membrane is an activated sludge group and has relatively large mass, and the flushed aged membrane is precipitated in the secondary sedimentation tank 3 '. And when the sewage has more impurities and the water treatment load is too high, the return pipeline 25 ' is started, and the treated water in the secondary sedimentation tank 3 ' is introduced into the water inlet way 21 ' to dilute the sewage and reduce the treatment load.

Claims (10)

1. A biofilter tube, characterized in that:

comprises a pipe body, at least one layer of column net, two port buckle discs and a plurality of filter materials;

the pipe body is hollow;

the column net is sleeved in the pipe body, and two ends of the column net are respectively fixed with the two port buckling discs;

the port buckling discs are hollowed out, and the two port buckling discs are respectively fixed in the two end parts of the pipe body;

the surface of the column net is in a net shape, and the filter material is fixed in the meshes of the column net.

2. The biofilter tube of claim 1, wherein:

the number of layers of the column net is multiple, the inner diameters of the column net are sequentially increased in an increasing mode, and the column net with the smaller inner diameter is sleeved in the column net with the larger inner diameter.

3. The biofilter tube according to claim 2, wherein:

the port buckling disc is provided with a port inner ring, a port outer ring, a plurality of port supporting connecting rods and a plurality of port arc-shaped rod groups;

the port inner ring is positioned in the port outer ring, the port support connecting rod is positioned between the port inner ring and the port outer ring, one end of the port support connecting rod is fixedly connected with the port inner ring, and the other end of the port support connecting rod is fixedly connected with the port outer ring;

the port arc rod group comprises a plurality of port arc rods which are fixed between two adjacent port support connecting rods, and the port arc rods in the same group of port arc rod groups form a continuous or discontinuous annular structure;

the plurality of groups of port arc-shaped rod groups are positioned between the port inner ring and the port outer ring and are sequentially arranged from inside to outside by taking the port inner ring as a center;

the inner ring wall of the port inner ring is provided with a plurality of port inner ring arc-shaped rods fixedly arranged along the wall;

in the port buckle disc, along the direction from inside to outside, a port inner ring arc-shaped rod and a plurality of groups of port arc-shaped rod groups of a port inner ring are sequentially and respectively in one-to-one correspondence with a plurality of sleeved column nets;

the port inner ring arc-shaped rod and one side surface of the port arc-shaped rod are respectively provided with a port clamping groove arranged along the length direction of the port inner ring arc-shaped rod and are respectively matched with the annular end parts of the corresponding column nets, and the annular end parts of the corresponding column nets can be clamped into the port clamping grooves and are fixed with the port clamping discs.

4. The biofilter tube of claim 1, wherein:

wherein the number of layers of the column net is one;

the port buckling disc is provided with a port inner ring, a port outer ring and a plurality of port supporting connecting rods, the port inner ring is positioned in the port outer ring, the port supporting connecting rods are positioned between the port inner ring and the port outer ring, one end of each port supporting connecting rod is fixedly connected with the port inner ring, and the other end of each port supporting connecting rod is fixedly connected with the port outer ring;

the inner ring wall of the port inner ring is provided with a plurality of port inner ring arc-shaped rods fixedly arranged along the wall and corresponding to the position of the column net;

one side surface of the port inner ring arc-shaped rod is provided with a port clamping groove arranged along the length direction of the port inner ring arc-shaped rod, the port clamping groove is matched with the annular end part of the column net, and the annular end part of the column net can be fixedly clamped in the port clamping groove.

5. The biofilter tube according to claim 2, wherein:

the connecting plate also comprises a plurality of connecting plates;

the column net is provided with a plurality of column net segments which are sequentially connected end to end through the connecting discs;

each column net section in the column nets of the plurality of layers of the sleeved column nets corresponds to each other, and the column net sections of different column nets at the same relative position are connected with the column net sections at the adjacent positions through the same connecting disc.

6. The biofilter tube of claim 5, wherein:

the connecting disc comprises a first connecting buckle disc and a second connecting buckle disc which are hollowed out, the first connecting buckle disc is fixedly connected with the end part of each column network segment sleeved at the same position, the second connecting buckle disc is fixedly connected with the end part of each column network segment sleeved at the adjacent position, the first connecting buckle disc is fixedly connected with the second connecting buckle disc, and the column network segments sleeved at the two adjacent positions are fixedly connected;

the first connecting buckle disc is provided with a first connecting inner ring, a first connecting outer ring, a plurality of first connecting support connecting rods and a plurality of first connecting arc-shaped rod groups;

the first connecting inner ring is positioned in the first connecting outer ring, the first connecting support connecting rod is positioned between the first connecting inner ring and the first connecting outer ring, one end of the first connecting support connecting rod is fixedly connected with the first connecting inner ring, and the other end of the first connecting support connecting rod is fixedly connected with the first connecting outer ring;

the first connecting arc rod group comprises a plurality of first connecting arc rods which are fixed between two adjacent first connecting and supporting connecting rods, and the first connecting arc rods in the same group of first connecting arc rod groups form a discontinuous annular structure;

the plurality of groups of first connecting arc-shaped rod groups are positioned between the first connecting inner ring and the first connecting outer ring and are sequentially arranged from inside to outside by taking the first connecting inner ring as a center;

the first connecting arc-shaped rods in the first connecting arc-shaped rod groups are equal in number and correspond to one another;

the inner ring wall of the first connecting inner ring is provided with a plurality of first connecting inner ring arc-shaped rods fixedly arranged along the wall, the number of the first connecting inner ring arc-shaped rods is equal to that of the first connecting arc-shaped rods in the same group of first connecting arc-shaped rod groups, and the first connecting arc-shaped rods are in one-to-one correspondence;

in the first connecting buckle disc, along the direction from inside to outside, a first connecting inner ring arc-shaped rod of a first connecting inner ring and a plurality of groups of first connecting arc-shaped rod groups sequentially correspond to a plurality of layers of column network segments sleeved at the same position one by one respectively;

one side surface of each of the first connecting inner ring arc-shaped rod and the first connecting arc-shaped rod is provided with a first connecting clamping groove arranged along the length direction of the first connecting inner ring arc-shaped rod and matched with the annular end part of the corresponding column network segment at the same position respectively, and the annular end part of the corresponding column network segment can be clamped into each first connecting clamping groove and fixed with the first connecting clamping disc;

in the first connecting buckle disc, the other side surfaces of the first connecting inner ring arc-shaped rod and the first connecting arc-shaped rod are provided with first buckles arranged along the length direction of the first connecting inner ring arc-shaped rod and the first connecting arc-shaped rod;

the section of the first buckle is in a hook shape and is provided with a first vertical wall and a first horizontal wall which are vertical to each other, one side of the first vertical wall is fixedly connected with the side surface of the rod body, the other side of the first vertical wall is fixedly connected with one side of the first horizontal wall, and the inner surface of the first horizontal wall is provided with a buckle groove;

the second connecting buckle disc is provided with a second connecting inner ring, a second connecting outer ring, a plurality of second connecting support connecting rods and a plurality of groups of second connecting arc-shaped rod groups, wherein the second connecting inner ring corresponds to each structure of the first connecting buckle disc;

the second connecting inner ring is positioned in the second connecting outer ring, the second connecting and supporting connecting rod is positioned between the second connecting inner ring and the second connecting outer ring, one end of the second connecting and supporting connecting rod is fixedly connected with the second connecting inner ring, and the other end of the second connecting and supporting connecting rod is fixedly connected with the second connecting outer ring;

the second connecting arc rod group comprises a plurality of second connecting arc rods which are fixed between two adjacent second connecting and supporting connecting rods, and the second connecting arc rods in the same group of second connecting arc rod groups form a discontinuous annular structure;

the plurality of groups of second connecting arc-shaped rod groups are positioned between the second connecting inner ring and the second connecting outer ring and are sequentially arranged from inside to outside by taking the second connecting inner ring as a center;

the number of the second connecting arc-shaped rods in the plurality of groups of second connecting arc-shaped rod groups is equal and is in one-to-one correspondence;

the inner ring wall of the second connecting inner ring is provided with a plurality of second connecting inner ring arc-shaped rods fixedly arranged along the wall, the number of the second connecting inner ring arc-shaped rods is equal to that of the second connecting arc-shaped rods in the same group of second connecting arc-shaped rod groups, and the second connecting inner ring arc-shaped rods are in one-to-one correspondence;

in the second connecting buckle disc, along the direction from inside to outside, a second connecting inner ring arc-shaped rod and a plurality of groups of second connecting arc-shaped rod groups of a second connecting inner ring are sequentially and respectively in one-to-one correspondence with a plurality of sleeved column network segments at the same position;

one side surface of each of the second connecting inner ring arc-shaped rod and the second connecting arc-shaped rod is provided with a second connecting clamping groove arranged along the length direction of the second connecting inner ring arc-shaped rod and the second connecting arc-shaped rod, the second connecting clamping grooves are respectively matched with the annular end parts of the corresponding column network segments at the same position, and the annular end parts of the corresponding column network segments can be clamped into the second connecting clamping grooves and are fixed with the second connecting clamping discs;

in the second connecting buckle disc, the other side surfaces of the second connecting inner ring arc-shaped rod and the second connecting arc-shaped rod are provided with second buckles arranged along the length direction of the second connecting inner ring arc-shaped rod and the second connecting arc-shaped rod;

the section of the second buckle is in a hook shape and is provided with a second vertical wall and a second horizontal wall which are vertical to each other, one side of the second vertical wall is fixedly connected with the side surface of the rod body, the other side of the second vertical wall is fixedly connected with one side of the second horizontal wall, and the inner surface of the second horizontal wall is provided with a buckle bulge which is matched with the buckle groove of the first connecting buckle disc;

the sum of the first connecting arc-shaped rods in the first connecting arc-shaped rod group is equal to the sum of the second connecting arc-shaped rods in the second connecting arc-shaped rod group, and the first connecting arc-shaped rods and the second connecting arc-shaped rods are matched in a one-to-one correspondence manner;

the arc length of the first connecting arc-shaped rods is not more than the arc length of the intervals among the first connecting arc-shaped rods, and the arc length of the first connecting inner ring arc-shaped rods is not more than the arc length of the intervals among the first connecting inner ring arc-shaped rods;

the second buckle of the second connecting buckle disc is matched with the first buckle of the first connecting buckle disc, when the second connecting buckle disc and the first connecting buckle disc are oppositely placed, the second buckle and the first buckle which are corresponding in position can be mutually inserted and fixed, the buckle protrusion of the second buckle is inserted into the buckle groove of the first buckle, and the second connecting buckle disc is fixedly connected with the first connecting buckle disc.

7. The biofilter tube of claim 1, wherein:

the outer wall of the port buckling disc is provided with a plurality of raised sections which are arranged along the wall at intervals;

the inner wall of the end part of the pipe body is provided with a plurality of placing grooves which are arranged at intervals along the wall, partition walls are arranged between adjacent placing grooves, and the placing grooves and the partition walls are equal to the protruding sections of the port buckle disc in number and are in one-to-one correspondence;

the inner wall of the partition wall is provided with a pipe body clamping groove arranged along the length of the partition wall, the pipe body clamping groove is matched with the protruding section, and the protruding section can be inserted into the pipe body clamping groove;

the port buckle disc is arranged in the end part of the pipe body, the protruding sections are respectively arranged in the placing grooves, the port buckle disc is rotated, the protruding sections are inserted into the pipe body clamping grooves adjacent to the placing grooves from the end part, and the port buckle disc is fixed with the pipe body.

8. The biofilter tube according to claim 7, wherein:

in the cross section of the convex section, the outer side part is semicircular, the inner side part is rectangular, the inner side part is connected with the linear side of the outer side part, and the width of the linear side is greater than that of the inner side part;

the cross section of the pipe body clamping groove is the same as the cross section of the protruding section in shape and size, and the protruding section can be wedged into the pipe body clamping groove.

9. The biofilter tube of claim 1, wherein:

wherein, the filter material has two hemispheres and connecting portion between it, and the cross-section of connecting portion is less than the basal plane of hemispheres, and the filter material is elastic material, compresses a hemisphere and fills in and pass the mesh of column net, this hemisphere recovers, and the connecting portion card of filter material is in the mesh of column net, and a hemisphere is located the inboard of this column net, and another hemisphere is located the outside of this column net.

10. The utility model provides a water treatment unit, sets up between just heavy pond and two heavy ponds, its characterized in that:

comprises a water inlet road, a plurality of groups of branch pipeline groups, an aeration device, a flushing pipeline and a return pipeline;

one end of the water inlet road is communicated with the primary sedimentation tank, the other end of the water inlet road is provided with a plurality of water inlet road branches which are connected in parallel, the number of the water inlet road branches is equal to that of the branch pipeline groups, and the water inlet road branches correspond to the branch pipeline groups one by one;

a branch valve is arranged on each water inlet road branch;

the branch pipe set comprises a branch pipe and a plurality of biological filter pipes according to any one of claims 1-9;

one end of the branch pipeline is communicated with the corresponding water inlet road branch of the group;

one end of each biological filter tube is communicated with the branch pipeline, the other end of each biological filter tube is communicated with the secondary sedimentation tank, and the biological filter tubes are connected in parallel;

the aeration device is arranged on the water inlet road and is arranged on the front side of the water inlet road branch along the water flow direction;

one end of the flushing pipeline is communicated with the secondary sedimentation tank, the other end of the flushing pipeline is provided with a plurality of flushing pipeline branches which are connected in parallel, the number of the flushing pipeline branches is equal to that of the branch pipeline groups and corresponds to the branch pipeline groups one by one, and the flushing pipeline branches are communicated with the branch pipelines of the corresponding branch pipeline groups;

each flushing pipeline branch is provided with a flushing branch valve;

the flushing pipeline is provided with a flushing pump and is arranged on the front side of the flushing pipeline branch along the water flowing direction;

one end of the return pipeline is communicated with the secondary sedimentation tank, the other end of the return pipeline is communicated with the water inlet road, and the communicated position is positioned on the front side of the aeration device.

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