Staged sewage treatment device

Abstract

The utility model discloses a staged sewage treatment device and relates to the technical field of sewage treatment. The sewage treatment device comprises a treatment tank, one side in the treatment tank is provided with a filter assembly for preliminarily filtering sewage, and the other side in the treatment tank is also provided with a flocculation assembly for flocculating and settling the sewage; the filter assembly comprises a mounting frame fixedly connected to one side in the treatment tank. According to the utility model, solid impurities adhered to the filter screen are removed through the scraper blade, the U-shaped frame drives the back-flushing pipe to move the filter screen, and the filter screen is back-flushed through high-pressure airflow provided by the back-flushing pipe, so that the problem that the filter screen is inconvenient to avoid being blocked in the prior art is solved; meanwhile, a feeding pipe is driven by a lead screw and a third sliding block to move in the treatment pond, a flocculating agent is added into the treatment pond through the feeding pipe and a branch pipe, and liquid in the treatment pond is stirred at the same time, so that the problem that the flocculating agent is inconvenient to uniformly add in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewage treatment technical field, especially a kind of hierarchical sewage treatment device. BACKGROUND

[0002] Sewage treatment is an important part of environmental protection and water resource recycling, and can be divided into physical treatment, chemical treatment and biological treatment according to different processing methods, wherein in the physical treatment process of sewage, sedimentation is a very important part, by adding coagulant to sewage, part of impurities in sewage is formed into sediment by coagulant, effectively removing part of impurities in sewage;

[0003] The existing document with the announcement number CN218596199U discloses a hierarchical sewage treatment device, which comprises a treatment tank, an inner frame in the shape of a mouth is fixedly welded in the inner cavity of the treatment tank, wherein a filter screen for primary filtration treatment of sewage is welded on the inner side of the inner frame, a first motor is welded on the edge of one side wall of the treatment tank, a screw rod is coaxially connected to the output shaft of the first motor, the screw rod is horizontally arranged on one side wall of the inner cavity of the treatment tank, a limiting rod is fixedly welded on the other side of the inner cavity of the treatment tank, a push plate is further arranged in the inner cavity of the treatment tank, one end of the push plate is threadedly connected to the screw rod, and the other end of the push plate is slidably sleeved on the limiting rod, the bottom wall of the push plate is attached to the filter screen, and a discharge port is formed in the side wall of the treatment tank away from the first motor.

[0004] However, it still has the following disadvantages in actual use:

[0005] The hierarchical sewage treatment device in the above has a filter screen for filtering solid impurities in sewage, and a push plate for discharging solid impurities on the filter screen, but the filter screen is easy to be blocked during use, affecting the filtration effect of the filter screen on the sewage, and the treatment effect is poor.

[0006] The hierarchical sewage treatment device in the above has a side pipe welded below the inner frame of the treatment tank, and the coagulant is added to the treatment tank through the side pipe, so that the sewage impurities in the treatment tank can be precipitated out conveniently, but the position of the side pipe on the treatment tank is fixed during use, so that the coagulant cannot be uniformly added to all parts of the treatment tank, and the sewage precipitation effect is poor.

[0007] Therefore, we provide a hierarchical sewage treatment device to solve the above problems. UTILITY MODEL CONTENTS

[0008] The utility model discloses a hierarchical sewage treatment device, through the scraper to the solid impurities adhered on the filter screen is removed to the movement of filter screen through the U type frame drive backflush pipe, through the high pressure airflow provided by backflush pipe to the backflush of filter screen, has solved the inconvenient problem of avoiding filter screen blockage of current, and through the screw rod and third sliding block drive feeding pipe movement in the treatment pool, through the feeding pipe and branch pipe one side adds the flocculating agent to the treatment pool, one side stirs the liquid in the treatment pool, has solved the inconvenient problem of even adding flocculating agent of current.

[0009] To solve the above technical problems, the utility model is realized through the following technical schemes:

[0010] The utility model discloses a hierarchical sewage treatment device, including treatment pool, the inside one side of treatment pool is provided with the filter assembly for carrying out the preliminary filtration to sewage, and the inside other side of treatment pool still is provided with the flocculation assembly for carrying out the flocculation precipitation to sewage,

[0011] The filter assembly includes a mounting frame fixedly connected to one side of the inside of the treatment pool, a filter screen for filtering the sewage is fixedly connected to the inside of the mounting frame, a scraper is movably connected to one side of the mounting frame, one side of the scraper is attached to the filter screen, a U-shaped frame is movably connected to the other side of the mounting frame, a backflush pipe for air flow backflushing the filter screen is fixedly connected to the inside of the U-shaped frame, and a plurality of nozzles are fixedly and uniformly connected to the backflush pipe along the axial direction of the backflush pipe.

[0012] The flocculation assembly includes fixed frames fixedly connected to the front and rear end faces of the other side of the inside of the treatment pool, screw rods are rotatably connected to the insides of the fixed frames, one end of each screw rod extends to the outside of the treatment pool and is fixedly connected to a first synchronous wheel, a third sliding block is threadedly connected to the section of the screw rod inside the fixed frame, adjacent sliding blocks are rotatably connected to feeding pipes for adding flocculating agents into the treatment pool, the ends of the feeding pipes close to each other are connected to the same flow divider through rotary joints, a plurality of branch pipes are fixedly and uniformly connected to the feeding pipes, and dosing holes are formed in the ends of the branch pipes away from the feeding pipes.

[0013] The utility model further provides that first sliding rods are fixedly and vertically connected to the front and rear ends of the outer wall of one side of the mounting frame, first sliding blocks are movably sleeved on the outer walls of the first sliding rods, and the ends of the first sliding blocks close to each other are fixedly connected to one side of the front and rear end faces of the scraper.

[0014] The utility model further provides that a first hydraulic cylinder is fixedly connected to one side of the top of the treatment pool, the output shaft of the first hydraulic cylinder extends to the inside of the treatment pool and is fixedly connected to the center position of the upper surface of the scraper.

[0015] The utility model further provides that a partition plate is fixedly connected to the center position of the inside of the treatment pool, and a water inlet pipe and a water outlet pipe are arranged above the outer walls of the two sides of the treatment pool.

[0016] The utility model discloses further provide as: the front and rear end of the other side outer wall of installation frame is along vertical fixed connection with second sliding rod, the outer wall of second sliding rod all movably sheathed with second sliding block, and the end of mutual approach of second sliding block is fixedly connected on the front and rear end face of U type frame respectively, and the front and rear end of the outer wall of the side of U type frame away from installation frame is all fixedly connected with ear seat, and the top front and rear end of treatment pool is all fixedly connected with second hydraulic cylinder, and the output shaft of second hydraulic cylinder all extends to the inside of treatment pool and is fixedly connected at the top of ear seat.

[0017] The utility model discloses further provide as: still fixedly connected with connecting pipe on the backflushing pipe, and the one end of connecting pipe away from backflushing pipe penetrates the longitudinal branch of U type frame and is fixedly connected with the first telescopic joint for external connection gas source, and the one end of first telescopic joint away from connecting pipe penetrates the bottom of treatment pool and extends to the outside below of treatment pool.

[0018] The utility model discloses further provide as: the one side outer wall of treatment pool is fixedly connected with drive motor through motor frame, and the output shaft of drive motor is fixed with second synchronous wheel, and second synchronous wheel is driven connection through synchronous belt with first synchronous wheel.

[0019] The utility model discloses further provide as: the bottom of fixed frame is all fixedly connected with fixed plate, and the upper surface one side of fixed plate is fixedly connected with rack, and the one end of backflushing pipe away from each other is all fixedly connected with installation rod, and the one end of installation rod away from backflushing pipe is fixedly connected on third sliding block, and the outer wall of installation rod is fixed with gear, and the bottom of gear is engaged in the top of rack.

[0020] The utility model discloses further provide as: the feed end of shunt is fixedly connected with the second telescopic joint for external connection flocculating agent hopper, and the top end of second telescopic joint extends to the outside above of treatment pool.

[0021] The utility model has the advantages of:

[0022] The utility model discloses through setting up filter assembly, starting first hydraulic cylinder and second hydraulic cylinder, and the output shaft of first hydraulic cylinder exerts external force to scraper, so that scraper lifts and falls, and the solid impurities adhered on filter screen are scraped off through the lifting and falling of scraper, and simultaneously, the output shaft of second hydraulic cylinder exerts external force to U type frame, so that U type frame drives backflushing pipe to lift and fall, and backflushing pipe is connected with gas source through first telescopic joint, and high pressure gas flow is provided in backflushing pipe through gas source, and the high pressure gas flow is sprayed on filter screen through spray head, realizes the cleaning of the solid impurities blocked in filter hole of filter screen, avoids the influence of filter screen blockage on the preliminary filtration of sewage, and is convenient for the self-cleaning of filter screen.

[0023] The utility model discloses a flocculation assembly is set up, and the flocculation agent is added to the flow divider and the feeding pipe through the second telescopic joint, and the driving motor is started, and the output shaft of driving motor drives the rotation of the screw rod through the synchronous belt, and the screw rod drives the feeding pipe to move in the horizontal direction in the treatment pool through the third sliding block, and through the mutual meshing between the rack and pinion, the feeding pipe rotates while moving, and then the flocculation agent is evenly added to each place in the treatment pool through the feeding pipe, and the flocculation agent is added in the treatment pool, and the flocculation and precipitation of the sewage in the treatment pool are facilitated, and the sewage is conveniently graded. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be to the embodiment description needed to use the drawing briefly introduces.

[0025] Figure 1 It is the whole structure schematic diagram of the utility model.

[0026] Figure 2 It is the whole front view of the utility model.

[0027] Figure 3 It is the structure schematic diagram of the utility model filter assembly.

[0028] Figure 4 It is the structure schematic diagram of the utility model scraper.

[0029] Figure 5 It is the structure schematic diagram of the utility model U type frame.

[0030] Figure 6 It is the structure schematic diagram of the utility model backflush pipe.

[0031] Figure 7 It is the structure schematic diagram of the utility model flocculation assembly.

[0032] Figure 8 It is the structure exploded view of the utility model fixed frame.

[0033] Figure 9 It is the installation schematic diagram of the utility model feeding pipe and flow divider.

[0034] Figure 10 It is the structure exploded view of the utility model driving motor.

[0035] In the drawings, the component list represented by each sign is as follows:

[0036] 1-treatment pool, 101-septum, 102-inlet pipe, 103-outlet pipe, 2-filtration assembly, 201-mounting frame, 202-filter screen, 203-scraping plate, 203a-first sliding rod, 203b-first sliding block, 203c-first hydraulic cylinder, 204-U-shaped frame, 204a-second sliding rod, 204b-second sliding block, 204c-ear seat, 204d-second hydraulic cylinder, 205-backflushing pipe, 205a-jet, 205b-connection pipe, 205c-first telescopic joint, 3-flocculation assembly, 301-fixed frame, 301a-fixed plate, 301b-rack, 302-screw rod, 302a-first synchronous wheel, 302b-third sliding block, 303-driving motor, 303a-motor frame, 303b-second synchronous wheel, 303c-synchronous belt, 304-feeding pipe, 304a-branch pipe, 304b-feeding hole, 304c-mounting rod, 304d-gear, 305-distributor, 305a-second telescopic joint. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Embodiment 1

[0038] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , which is the first embodiment of the utility model, and the embodiment provides a hierarchical sewage treatment device, which comprises a treatment pool 1, the inside of the treatment pool 1 is provided with a filtration assembly 2 for preliminarily filtering sewage, the filtration assembly 2 comprises a mounting frame 201, a filter screen 202, a scraping plate 203, a U-shaped frame 204 and a backflushing pipe 205, the scraping plate 203 is used for removing solid impurities adhered to the filter screen 202, the U-shaped frame 204 drives the backflushing pipe 205 to move the filter screen 202, and the filter screen 202 is backflushed by high-pressure airflow provided by the backflushing pipe 205, thereby solving the problem that the filter screen 202 is prone to blockage.

[0039] Specifically, the mounting frame 201 is fixedly connected to the inner side of the treatment tank 1, the inside of the mounting frame 201 is fixedly connected with a filter screen 202 for filtering sewage, one side of the mounting frame 201 is movably connected with a scraper 203, one side of the scraper 203 is attached to the filter screen 202, the other side of the mounting frame 201 is movably connected with a U-shaped frame 204, the inside of the U-shaped frame 204 is fixedly connected with a backflushing pipe 205 for airflow backflushing of the filter screen 202, a plurality of nozzles 205a are fixedly and communicatively arranged on the backflushing pipe 205 at equal intervals along the axial direction of the backflushing pipe 205, the mounting frame 201 is configured to mount the filter screen 202 and the like, the filter screen 202 is configured to preliminarily filter sewage in the treatment tank 1, the scraper 203 is configured to scrape off solid impurities adhered to the filter screen 202, the U-shaped frame 204 is configured to mount the backflushing pipe 205 and drive the backflushing pipe 205 to move up and down, and the backflushing pipe 205 and the nozzles 205a are configured to provide high-pressure airflow to the filter screen 202 to clean solid impurities clogging the filter holes of the filter screen 202.

[0040] Further, the front end and the rear end of the outer wall of one side of the mounting frame 201 are both fixedly connected with first sliding rods 203a in the vertical direction, first sliding blocks 203b are movably sleeved on the outer walls of the first sliding rods 203a, and the ends of the first sliding blocks 203b close to each other are fixedly connected to the sides of the front end face and the rear end face of the scraper 203, respectively.

[0041] A first hydraulic cylinder 203c is fixedly connected to the top side of the treatment tank 1, and the output shaft of the first hydraulic cylinder 203c extends into the inside of the treatment tank 1 and is fixedly connected to the center position of the upper surface of the scraper 203;

[0042] A partition plate 101 is fixedly connected to the central position in the inside of the treatment tank 1, and a water inlet pipe 102 and a water outlet pipe 103 are arranged above the outer walls of the two sides of the treatment tank 1, respectively;

[0043] The front end and the rear end of the outer wall of the other side of the mounting frame 201 are both fixedly connected with second sliding rods 204a in the vertical direction, second sliding blocks 204b are movably sleeved on the outer walls of the second sliding rods 204a, the ends of the second sliding blocks 204b close to each other are fixedly connected to the front end face and the rear end face of the U-shaped frame 204, respectively, ear seats 204c are fixedly connected to the front end and the rear end of the outer wall of the side of the U-shaped frame 204 away from the mounting frame 201, second hydraulic cylinders 204d are fixedly connected to the top front end and the top rear end of the treatment tank 1, and the output shafts of the second hydraulic cylinders 204d extend into the inside of the treatment tank 1 and are fixedly connected to the top of the ear seats 204c;

[0044] The connecting pipe 205b is further fixedly connected with the backflush pipe 205, one end of the connecting pipe 205b away from the backflush pipe 205 penetrates through the longitudinal branch of the U-shaped frame 204 and is fixedly connected with a first telescopic joint 205c for connecting with an air source, one end of the first telescopic joint 205c away from the connecting pipe 205b penetrates through the bottom of the treatment tank 1 and extends to the outside below the treatment tank 1.

[0045] The operation process of the embodiment is as follows: the first hydraulic cylinder 203c and the second hydraulic cylinder 204d are started, the output shaft of the first hydraulic cylinder 203c applies an external force to the scraper 203 to make the scraper 203 lift and descend, thereby scraping off the solid impurities adhered to the filter screen 202, at the same time, the output shaft of the second hydraulic cylinder 204d applies an external force to the U-shaped frame 204 to make the U-shaped frame 204 drive the backflush pipe 205 to lift and descend, and the backflush pipe 205 is connected with the air source through the first telescopic joint 205c, the high-pressure gas flow is provided into the backflush pipe 205 through the air source, the high-pressure gas flow is sprayed onto the filter screen 202 through the spray head 205a, and the solid impurities blocked in the filter holes of the filter screen 202 are cleaned. Embodiment 2

[0046] Please refer to Figure 1 , Figure 7 , Figure 8 , Figure 9 and Figure 10 , which is a second embodiment of the utility model, and is based on the previous embodiment, but is different from the previous embodiment in that the other side of the inside of the treatment tank 1 is further provided with a flocculation assembly 3 for adding flocculants, the flocculation assembly 3 comprises a fixed frame 301, a lead screw 302, a feeding pipe 304 and a flow divider 305, the lead screw 302 and the third sliding block 302b drive the feeding pipe 304 to move in the treatment tank 1, the feeding pipe 304 and the branch pipe 304a add flocculants to the treatment tank 1 and stir the liquid in the treatment tank 1 at the same time, thereby solving the problem that the existing flocculants are not easy to add uniformly.

[0047] Specifically, the fixed frame 301 is provided with two and is fixedly connected to the front and rear end faces of the other side of the inside of the treatment tank 1, the inside of the fixed frame 301 is rotatably connected with the lead screw 302, one end of the lead screw 302 extends to the outside of the treatment tank 1 and is fixedly connected with a first synchronous wheel 302a, a section of the lead screw 302 in the fixed frame 301 is screw-connected with a third sliding block 302b, the sliding blocks are rotatably connected with the feeding pipes 304 for adding flocculants into the treatment tank 1 between adjacent sliding blocks, the feeding pipes 304 close to each other are connected with the same flow divider 305 through a rotary joint, the feeding pipes 304 are fixedly connected with a plurality of branch pipes 304a, and the branch pipes 304a away from the feeding pipes 304 are provided with feeding holes 304b.

[0048] Further, the one side outer wall of the treatment pool 1 is fixedly connected with a driving motor 303 through a motor bracket 303a, the output shaft of the driving motor 303 is fixedly connected with a second synchronous wheel 303b, the second synchronous wheel 303b is drivingly connected with the first synchronous wheel 302a through a synchronous belt 303c;

[0049] The bottom of the fixed frame 301 is fixedly connected with a fixed plate 301a, one side of the upper surface of the fixed plate 301a is fixedly connected with a rack 301b, the ends of the backflush pipes 205 away from each other are fixedly connected with mounting rods 304c, the ends of the mounting rods 304c away from the backflush pipes 205 are fixedly connected with the third sliding blocks 302b, the outer wall of the mounting rods 304c is fixedly connected with a gear 304d, the bottom of the gear 304d is engaged above the rack 301b;

[0050] The feeding end of the flow divider 305 is fixedly connected with a second telescopic joint 305a for externally connecting a flocculating agent hopper, the top end of the second telescopic joint 305a extends to the outside of the treatment pool 1.

[0051] The rest of the structure is the same as that of example 1.

[0052] The operation process of the embodiment is as follows: flocculating agent is added to the flow divider 305 and the feeding pipe 304 through the second telescopic joint 305a, and the driving motor 303 is started, the output shaft of the driving motor 303 drives the lead screw 302 to rotate through the synchronous belt 303c, the lead screw 302 drives the feeding pipe 304 to move in the horizontal direction in the treatment pool 1 through the third sliding block 302b, and the feeding pipe 304 is rotated while moving through the mutual engagement between the rack 301b and the gear 304d, so that the flocculating agent is uniformly added to the treatment pool 1 through the feeding pipe 304.

[0053] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A stepwise sewage treatment plant comprising a treatment tank (1), characterized in that: The inside one side of the treatment pool (1) is provided with a filter assembly (2) for primary filtering of sewage, and the other side of the inside of the treatment pool (1) is further provided with a flocculation assembly (3) for flocculation and sedimentation of sewage. The filter assembly (2) comprises a mounting frame (201) fixedly connected to the inside one side of the treatment pool (1), and a filter screen (202) for filtering sewage is fixedly connected to the inside of the mounting frame (201), one side of the mounting frame (201) is movably connected with a scraper (203), one side of the scraper (203) is attached to the filter screen (202), the other side of the mounting frame (201) is movably connected with a U-shaped frame (204), and a backflush pipe (205) for airflow backflush of the filter screen (202) is fixedly connected to the inside of the U-shaped frame (204), a plurality of nozzles (205a) are fixedly and equally spaced along the axial direction of the backflush pipe (205). The flocculation assembly (3) comprises fixed frames (301) fixedly connected to the front and rear end faces of the other side of the inside of the treatment pool (1), respectively, and a lead screw (302) is rotatably connected to the inside of the fixed frame (301), one end of the lead screw (302) extends to the outside of the treatment pool (1) and is fixedly connected with a first synchronous wheel (302a), and a third sliding block (302b) is threadedly connected to the section of the lead screw (302) inside the fixed frame (301), the sliding blocks adjacent to each other are rotatably connected with feeding pipes (304) for adding flocculants into the treatment pool (1), the feeding pipes (304) are connected with the same flow divider (305) through a rotary joint at the ends close to each other, a plurality of branch pipes (304a) are fixedly connected to the feeding pipes (304), and dosing holes (304b) are formed at the ends of the branch pipes (304a) away from the feeding pipes (304).

2. A step aeration sewage treatment plant according to claim 1, characterised in that The front and rear ends of the outer wall of one side of the mounting frame (201) are fixedly connected with first sliding rods (203a) in the vertical direction, and first sliding blocks (203b) are movably sleeved on the outer walls of the first sliding rods (203a), and the first sliding blocks (203b) are fixedly connected to one side of the front and rear end faces of the scraper (203) at the ends close to each other, respectively.

3. A step aeration sewage treatment device according to claim 1 wherein, A first hydraulic cylinder (203c) is fixedly connected to one side of the top of the treatment pool (1), and the output shaft of the first hydraulic cylinder (203c) extends to the inside of the treatment pool (1) and is fixedly connected to the center position of the upper surface of the scraper (203).

4. A step aeration sewage treatment plant according to claim 3, wherein A partition plate (101) is fixedly connected to the center position of the inside of the treatment pool (1), and water inlet pipes (102) and water outlet pipes (103) are arranged above the outer walls of the two sides of the treatment pool (1), respectively.

5. A step aeration sewage treatment device according to claim 1 wherein, The front and rear ends of the outer wall of the other side of the mounting frame (201) are vertically fixedly connected with second sliding rods (204a), outer walls of the second sliding rods (204a) are movably sleeved with second sliding blocks (204b), the second sliding blocks (204b) are fixedly connected to the front and rear end faces of the U-shaped frame (204) at the ends close to each other, and the front and rear ends of the outer wall of the side of the U-shaped frame (204) away from the mounting frame (201) are fixedly connected with ear seats (204c), the top of the front and rear ends of the treatment tank (1) are fixedly connected with second hydraulic cylinders (204d), and output shafts of the second hydraulic cylinders (204d) extend into the inside of the treatment tank (1) and are fixedly connected to the top of the ear seat (204c).

6. A step aeration sewage treatment device according to claim 1 wherein, The backflush pipe (205) is also fixedly connected with a connecting pipe (205b), one end of the connecting pipe (205b) away from the backflush pipe (205) penetrates the longitudinal branch of the U-shaped frame (204) and is fixedly connected with a first telescopic joint (205c) for external connection of a gas source, and one end of the first telescopic joint (205c) away from the connecting pipe (205b) penetrates the bottom of the treatment tank (1) and extends to the outside below the treatment tank (1).

7. A step aeration sewage treatment device according to claim 1 wherein, The side of the treatment tank (1) is fixedly connected with a driving motor (303) through a motor bracket (303a), and a second synchronous wheel (303b) is fixed to the output shaft of the driving motor (303), and the second synchronous wheel (303b) is in transmission connection with the first synchronous wheel (302a) through a synchronous belt (303c).

8. A step aeration sewage treatment device according to claim 1 wherein, The bottom of the fixed frame (301) is fixedly connected with a fixed plate (301a), and the upper surface of the fixed plate (301a) is fixedly connected with a rack (301b) on one side, and the ends of the backflush pipes (205) away from each other are fixedly connected with mounting rods (304c), and one end of the mounting rod (304c) away from the backflush pipe (205) is fixedly connected to the third sliding block (302b), and the outer wall of the mounting rod (304c) is fixedly connected with a gear (304d), and the bottom of the gear (304d) is engaged above the rack (301b).

9. A step aeration sewage treatment device according to claim 1 wherein, The feed end of the flow divider (305) is fixedly connected with a second telescopic joint (305a) for external connection of a flocculating agent hopper, and the top end of the second telescopic joint (305a) extends to the outside above the treatment tank (1).

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