CN216890545U

CN216890545U - Sewage treatment device for river drain outlet

Info

Publication number: CN216890545U
Application number: CN202220458888.3U
Authority: CN
Inventors: 孙健璘; 周伟恒; 张运; 薛宏建
Original assignee: Dongzhu Ecological Environment Protection Co Ltd
Current assignee: Dongzhu Ecological Environment Protection Co Ltd
Priority date: 2022-03-04
Filing date: 2022-03-04
Publication date: 2022-07-05
Anticipated expiration: 2032-03-04

Abstract

The utility model discloses a sewage treatment device for a drain outlet of a river channel, which comprises a sewage treatment tank, wherein a first sedimentation tank, an air flotation tank, a microorganism tank, a second sedimentation tank and a filtering tank are sequentially arranged in the sewage treatment tank along the water treatment direction; the first sedimentation tank is internally provided with a baffle plate and baffle plates which are arranged in a staggered way, and the bottom of the first sedimentation tank is provided with a first sludge discharge port; the lower end of the air floatation tank is provided with a first aeration mechanism, and the top of the air floatation tank is provided with a slag scraper; a second aeration mechanism and a medicament feeding mechanism are arranged in the microbial pool; a second sludge discharge port is formed in the sedimentation area at the bottom of the second sedimentation tank; a pebble layer and a zeolite layer are arranged in the filtering tank in sequence; the first sludge discharge port and the second sludge discharge port are connected with a sludge treatment device. The sewage treatment device for the drain outlet of the river channel disclosed by the utility model is simple in composition, easy to operate and maintain, capable of adapting to various river channel working conditions and high in sewage treatment degree and efficiency.

Description

Sewage treatment device for river drain outlet

Technical Field

The utility model belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment device for a river drain outlet.

Background

Along with the economic development, people also gradually pay attention to the increasingly serious river pollution. The pollution of the river channel is not only from industrial drainage, but also from domestic sewage along river villages, so that the pollution is relatively complex. After sewage is directly discharged into a river channel without being treated, a large amount of garbage can be accumulated at a sewage discharge outlet of the river channel, so that not only can serious pollution be caused to river water, the pollution area is enlarged, the treatment difficulty and cost are improved, but also the circulation and normal discharge of water in the river channel can be influenced. The pollution of the river channel seriously affects the work and life of people, so that people pay more and more attention to the treatment of the river channel sewage.

However, the existing sewage treatment device has the problems of more equipment and complex process, cannot cope with the physical impact problem caused by river sewage, cannot be suitable for the treatment working condition with high pollution degree and high flow speed, and has low river sewage treatment degree and efficiency.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to overcome the defects, the utility model aims to provide the sewage treatment device for the drain outlet of the river channel, which is simple in composition, easy to operate and maintain, capable of adapting to various river channel working conditions and high in sewage treatment degree and efficiency.

The technical scheme is as follows: a sewage treatment device for a river drain outlet comprises a sewage treatment tank arranged near the river drain outlet, wherein a first sedimentation tank, an air flotation tank, a microorganism tank, a second sedimentation tank and a filter tank are sequentially arranged in the sewage treatment tank along a water treatment direction, a water inlet is formed in the first sedimentation tank, a discharge port is formed in the filter tank, the water inlet is connected with a sewage concentration area arranged in the river channel through a water pump, sewage discharged by the drain outlet is firstly discharged into the sewage concentration area, the river channel is not directly discharged, and pollution to the river channel is reduced; the first sedimentation tank is internally provided with a partition plate, baffle plates which are arranged in a staggered mode are arranged between the partition plate and the wall of the first sedimentation tank, the bottom of the first sedimentation tank is also provided with a first sludge discharge port, and through the arrangement of the partition plate and the baffle plates, the impulsive force of sewage entering the sewage treatment tank is reduced, the flow speed is reduced, so that waste with high density in the sewage is precipitated in the first sedimentation tank to the greatest extent, and the treatment difficulty of a subsequent process is reduced; the lower end of the air floatation tank is provided with a first aeration mechanism, the top of the air floatation tank is provided with a slag scraping machine, the output end of the slag scraping machine is provided with a slag discharging area arranged on one side of the air floatation tank, the air floatation tank is communicated with a microorganism tank through a first water discharging opening arranged below the slag discharging area, the air floatation tank floats suspended particles with small density in sewage to the water surface through an air floatation treatment method to form a slag floating layer, and then the slag floating layer is discharged into the slag discharging area for centralized treatment through the slag scraping machine, so that waste with small density in the sewage is removed; the microbial pool is internally provided with a second aeration mechanism and a medicament feeding mechanism, the growth of microbes can be promoted by the arrangement of the aeration mechanism and the medicament feeding mechanism, the degradation and removal effects of the microbes are improved, and the upper end of the microbial pool is provided with a second water outlet communicated with a second sedimentation tank; a third water outlet connected with the filter tank is arranged at the upper end of the second sedimentation tank, a second sludge discharge port is arranged in the bottom sedimentation zone, and valves are arranged at the first water outlet, the second water outlet and the third water outlet to control the flow and switch; a pebble layer and a zeolite layer which are sequentially arranged along the water treatment direction are arranged in the filter tank, and the treated sewage is filtered, so that the treatment effect is improved; the first sludge discharge port and the second sludge discharge port are connected with a sludge treatment device through a sludge pump, and sludge is collected and treated in a centralized manner. Carry out multiple treatment to sewage through first sedimentation tank, air supporting pond, microorganism pond, second sedimentation tank, the filtering ponds that set gradually, can obviously alleviate pollutant content and concentration in the discharge outlet sewage of river, sewage treatment degree and efficient have guaranteed the quality of water of river, and can adapt to multiple river course operating mode.

Furthermore, in the above river sewage outlet sewage treatment device, the bottom of the first sedimentation tank is provided with an inclined part which is inclined upwards along the water treatment direction, and the first sludge discharge port is arranged at the lower end of the inclined part. This arrangement facilitates precipitation of the contaminant.

Furthermore, in the above river sewage outlet sewage treatment device, the partition plate is arranged at the length of the first sedimentation tank 1/2-2/3, and the bottom of the partition plate and the bottom of the first sedimentation tank are provided with gaps. The baffle and the inner wall of the first sedimentation tank form a loop-shaped flowing space, so that the impact force and the sewage flow speed are reduced, and the pollutants with high density are precipitated and the matters with low density float.

Furthermore, the filtering plate is arranged in the deslagging area, and a water outlet communicated with the air floatation tank is arranged below the filtering plate. This setting can reduce the water content of dross in the sediment district, reduces the degree of difficulty to dross subsequent processing.

Further, foretell river drain sewage treatment plant, the microorganism pond is equipped with the baffle with first drain outlet department of being relative, the length of baffle is greater than 1/2 microorganism pond width, the baffle constitutes the medicament mixed area with microorganism pond inner wall, medicament feeding mechanism locates the medicament mixed area. The baffle that sets up through relatively through the first drain outlet can reduce the velocity of flow that the sewage flows into the microorganism pond, makes sewage and the medicament intensive mixing who drops into in the medicament mixing area even.

Furthermore, in the above device for treating sewage at a drain outlet of a river, the agent feeding mechanism comprises two pipelines for respectively feeding the microbial water purifying agent and the microbial growth promoting agent, and when the microbial growth promoting agent and the microbial water purifying agent are fed together, the growth of microorganisms can be promoted, so that the conversion and degradation rates of pollution indexes such as COD (chemical oxygen demand), ammonia nitrogen and the like in water are improved; the pipeline is provided with a flow valve, and a plurality of sections of fixed blades are arranged inside the pipeline. The fixed blades can enable water flow to be divided in pairs, and vortex reverse rotation and cross flow are generated simultaneously, so that the medicament and sewage can obtain a better mixing effect.

Further, foretell river drain sewage treatment plant, first aeration mechanism is the same with second aeration mechanism structure, including aeration main pipe, aeration branch pipe and aerator, the aeration main pipe is connected with outside air compressor, aeration branch pipe crisscross locates aeration main pipe both sides, the aerator is located on the aeration branch pipe, is micropore disc aerator. The first aeration mechanisms are uniformly distributed in the air floatation tank, so that the adhesion of suspended substances can be accelerated, the suspended substances can quickly float upwards, and the cleaning speed is increased; the second aeration mechanism provides dissolved oxygen for the biological degradation reaction of the sewage so that the dissolved oxygen in the sewage can be quickly recovered, and favorable conditions are provided for the growth of microorganisms and the degradation and removal of pollutants.

Furthermore, foretell river drain sewage treatment plant, still be equipped with the biological ball in the microbial pool, the biological ball is located between aeration main pipe and the aeration branch pipe. The large specific surface area of the biological balls provides a place for growth and attachment of microorganisms, the microbial biomass in the reaction tank is increased, the treatment efficiency is improved, and the treatment time is shortened. The biological ball can be a plastic hollow ball, and porous materials such as sponge, porous glass ceramic, volcanic rock, zeolite and the like are filled in the ball body.

The technical scheme shows that the utility model has the following beneficial effects:

1. according to the sewage treatment device for the drain outlet of the river channel, the first sedimentation tank is provided with the baffle plate and the flow baffle plate, so that the impulsive force of sewage entering the sewage treatment tank is reduced, the flow rate is reduced, waste with high density in the sewage is precipitated in the first sedimentation tank as much as possible, and the treatment difficulty of a subsequent process is reduced;

2. according to the sewage treatment device for the drain outlet of the river, disclosed by the utility model, the microbial growth promoting agent and the microbial water purifying agent are simultaneously added into the microbial treatment tank, so that the growth of microorganisms can be promoted, and the conversion degradation rate of pollution indexes such as COD (chemical oxygen demand), ammonia nitrogen and the like in water is improved; the large specific surface area of the biological balls provides a place for growth and attachment of microorganisms, so that the microbial biomass in the reaction tank is increased, the treatment efficiency is improved, and the treatment time is shortened;

3. according to the sewage treatment device for the river drain outlet, provided by the utility model, sewage is subjected to multiple treatment through the first sedimentation tank, the air flotation tank, the microorganism tank, the second sedimentation tank and the filtering tank which are sequentially arranged, so that the content and concentration of pollutants in the sewage discharged into the river drain outlet can be obviously reduced, the sewage treatment degree and efficiency are high, the quality of river water is ensured, and the sewage treatment device can adapt to various river channel working conditions.

Drawings

FIG. 1 is a schematic structural view of a sewage treatment device for a river drain outlet according to the present invention;

FIG. 2 is a schematic view of a top view of a microorganism pool of the sewage treatment device for a river drain outlet according to the present invention;

in the figure: 1 sewage treatment tank, 11 water inlet, 12 discharge port, 2 first sedimentation tank, 21 partition board, 22 baffle plate, 23 first sludge discharge port, 24 inclined part, 3 air flotation tank, 31 first aeration mechanism, 311 main aeration pipe, 312 branch aeration pipe, 313 aerator, 32 residue scraping machine, 33 residue discharge area, 34 first discharge port, 35 filter plate, 36 water outlet, 4 microorganism tank, 41 second aeration mechanism, 42 medicament feeding mechanism, 421 pipeline, 422 flow valve, 43 second discharge port, 44 baffle plate, 45 medicament mixing area, 46 biological ball, 5 second sedimentation tank, 51 third discharge port, 52 second sludge discharge port, 6 filter tank, 61 pebble layer, 62 zeolite layer and 7 sludge treatment device.

Detailed Description

The utility model is further elucidated with reference to the drawings and the embodiments.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1

As shown in fig. 1-2, the sewage treatment device for the drain outlet of the river channel comprises a sewage treatment tank 1 arranged near the drain outlet of the river channel, wherein a first sedimentation tank 2, an air flotation tank 3, a microorganism tank 4, a second sedimentation tank 5 and a filter tank 6 are sequentially arranged in the sewage treatment tank 1 along the water treatment direction, a water inlet 11 is formed in the first sedimentation tank 2, a discharge port 12 is formed in the filter tank 6, the water inlet 11 is connected with a sewage concentration area arranged in the river channel through a water pump, sewage discharged by the drain outlet is firstly discharged into the sewage concentration area, the river channel is not directly discharged, the pollution to the river channel is reduced, and the discharge port 12 is connected with the river channel; the first sedimentation tank 2 is internally provided with a partition plate 21, flow baffle plates 22 which are arranged in a staggered mode are arranged between the partition plate 21 and the wall of the first sedimentation tank 2, the bottom of the first sedimentation tank 2 is also provided with a first sludge discharge port 23, and through the arrangement of the partition plate 21 and the flow baffle plates 22, the impulsive force of sewage entering the sewage treatment tank 1 is reduced, the flow speed is reduced, so that waste with high density in the sewage is precipitated in the first sedimentation tank 2 to the greatest extent, and the treatment difficulty of the subsequent process is reduced; the lower end of the air flotation tank 3 is provided with a first aeration mechanism 31, the top of the air flotation tank is provided with a slag scraping machine 32, the output end of the slag scraping machine 32 is provided with a slag discharging area 33 arranged on one side of the air flotation tank 3, the air flotation tank 3 is communicated with the microorganism tank 4 through a first water discharging opening 34 arranged below the slag discharging area 33, the air flotation tank 3 floats suspended particles with low density in the sewage to the water surface through an air flotation treatment method to form a slag floating layer, and then the slag floating layer is discharged into the slag discharging area 33 through the slag scraping machine 32 for centralized treatment, so that waste with low density in the sewage is removed; a second aeration mechanism 41 and a medicament feeding mechanism 42 are arranged in the microorganism pool 4, the growth of microorganisms can be promoted by arranging the aeration mechanism and the medicament feeding mechanism, the degradation and removal effects of the microorganisms are improved, and a second water outlet 43 communicated with the second sedimentation tank 5 is arranged at the upper end of the microorganism pool 4; the upper end of the second sedimentation tank 5 is provided with a third water outlet 51 connected with the filtering tank 6, and the bottom sedimentation zone is provided with a second sludge discharge port 52; a pebble layer 61 and a zeolite layer 62 are sequentially arranged in the filtering tank 6 along the water treatment direction, and the treated sewage is filtered, so that the purification effect is improved; the first sludge discharge port 23 and the second sludge discharge port 52 are connected with the sludge treatment device 7 through a sludge pump, and sludge is collected and treated in a centralized manner. Carry out multiple treatment through the first sedimentation tank 2, air supporting pond 3, microorganism pond 4, second sedimentation tank 5, the filtering ponds 6 that set gradually to sewage, can obviously alleviate pollutant content and concentration of discharging into in the river drain sewage, sewage treatment degree and efficient have guaranteed the quality of water of river, and can adapt to multiple river course operating mode.

Example 2

The bottom of the first sedimentation tank 2 is provided with an inclined part 24 which is inclined upwards along the water treatment direction, and the first sludge discharge port 23 is arranged at the lower end of the inclined part 24. The partition plate 21 is arranged at the 1/2-2/3 length of the first sedimentation tank 2, and the bottom of the partition plate 21 and the bottom of the first sedimentation tank 2 are provided with notches. The baffle 21 and the inner wall of the first sedimentation tank 2 form a square-shaped flowing space, so that the impact force and the sewage flow speed are reduced, and the pollutants with high density can be conveniently precipitated and the matters with low density can float upwards.

A filter plate 35 is arranged in the deslagging area 33, and a water outlet 36 communicated with the air floatation tank 3 is arranged below the filter plate 35. The arrangement can reduce the water content of the scum in the scum discharge area 33 and reduce the difficulty of subsequent treatment of the scum.

A baffle 44 is arranged at the position, opposite to the first drainage port 34, of the microorganism pool 4, the length of the baffle 44 is greater than 1/2 the width of the microorganism pool 4, the baffle 44 and the inner wall of the microorganism pool 4 form a medicament mixing area 45, and the medicament feeding mechanism 42 is arranged in the medicament mixing area 45. The baffle 44 arranged opposite to the first water discharge port 34 can reduce the flow rate of sewage flowing into the microorganism pool, so that the sewage and the medicament put into the medicament mixing area are fully and uniformly mixed.

The agent feeding mechanism 42 comprises two pipelines 421 for respectively feeding a microorganism water purifying agent and a microorganism growth promoting agent, and when the microorganism growth promoting agent and the microorganism water purifying agent are fed together, the growth of microorganisms can be promoted, so that the conversion degradation rate of pollution indexes such as COD (chemical oxygen demand), ammonia nitrogen and the like in water is improved; the pipeline 421 is provided with a flow valve 422, and the inside of the pipeline 421 is also provided with a plurality of sections of fixed blades. The fixed blades can enable water flow to be divided in pairs, and vortex reverse rotation and cross flow are generated simultaneously, so that the medicament and sewage can obtain a better mixing effect.

The first aeration mechanism 31 and the second aeration mechanism 41 have the same structure, and comprise a main aeration pipe 311, branch aeration pipes 312 and aerators 313, wherein the main aeration pipe 311 is connected with an external air compressor (not shown), the branch aeration pipes 312 are arranged at two sides of the main aeration pipe 311 in a staggered manner, and the aerators 313 are arranged on the branch aeration pipes 312 and are microporous disc-shaped aerators. The first aeration mechanisms 31 are uniformly distributed in the air floatation tank, so that the adhesion of suspended substances can be accelerated, the suspended substances can quickly float upwards, and the cleaning speed is increased; the second aeration mechanism 41 provides dissolved oxygen for the biological degradation reaction of the sewage so that the dissolved oxygen in the sewage can be quickly recovered, and favorable conditions are provided for the growth of microorganisms and the degradation removal of pollutants.

Biological balls 46 are also arranged in the microorganism tank 4, and the biological balls 46 are positioned between the main aeration pipe 311 and the branch aeration pipes 312. The larger specific surface area of the bio-balls 46 provides a place for growth and attachment of microorganisms, increases the amount of microorganisms in the reaction tank, improves the treatment efficiency and shortens the treatment time. The bio-ball 46 may be a hollow plastic ball, and porous materials such as sponge, porous glass ceramic, volcanic rock, zeolite, etc. are filled in the ball. The porous material in the biological ball provides an ideal place for the growth of microorganisms, the anoxic environment of the inner layer improves the nitrification and denitrification effect for the system, the degradation and removal effect of nitrogen-containing pollutants is enhanced, and the enhanced treatment of COD, ammonia nitrogen, TN and TP in sewage can be realized.

The working principle of the sewage treatment device for the drain outlet of the river channel provided by the utility model is as follows: sewage enters a first sedimentation tank 2 from a river sewage concentration area, is buffered and decelerated through a partition plate 21 and a flow baffle plate 22, and pollutants with large density are removed through sedimentation; the sewage after primary treatment flows into an air floatation tank 3 from the upper end of a first sedimentation tank 2, suspended matters in the sewage are removed through the action of air floatation, then the sewage enters a medicament mixing zone 45 of a microorganism tank 4, the sewage is fully mixed with a medicament and then enters a microorganism treatment zone, soluble pollutants containing nitrogen, phosphorus and the like in the sewage are removed through microorganism degradation and reinforcement, the reinforced treatment of COD, ammonia nitrogen, TN and TP in the sewage is realized, then the sewage enters a second sedimentation tank 5 for sedimentation, the sewage is separated into upper clear liquid and lower sludge after sedimentation, the clear liquid enters a filtering tank 6, and the clear liquid is filtered by the filtering tank 6 and then is discharged into a river channel from a discharge port 12; the sludge in the first sedimentation tank 2 and the second sedimentation tank 5 is pumped to a sludge treatment device 7 by a sludge pump for centralized treatment.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.

Claims

1. The utility model provides a river drain sewage treatment plant which characterized in that: the sewage treatment system comprises a sewage treatment tank (1) arranged near a drain outlet of a river channel, wherein a first sedimentation tank (2), an air flotation tank (3), a microorganism tank (4), a second sedimentation tank (5) and a filtering tank (6) are sequentially arranged in the sewage treatment tank (1) along the water treatment direction, a water inlet (11) is formed in the first sedimentation tank (2), a discharge outlet (12) is formed in the filtering tank (6), the water inlet (11) is connected with a sewage concentration area arranged in the river channel through a water pump, and the discharge outlet (12) is connected with the river channel; a partition plate (21) is arranged in the first sedimentation tank (2), baffle plates (22) which are arranged in a staggered mode are arranged between the partition plate (21) and the wall of the first sedimentation tank (2), and a first sludge discharge port (23) is further arranged at the bottom of the first sedimentation tank (2); the lower end of the air floatation tank (3) is provided with a first aeration mechanism (31), the top of the air floatation tank is provided with a slag scraping machine (32), the output end of the slag scraping machine (32) is provided with a slag discharging area (33) arranged on one side of the air floatation tank (3), and the air floatation tank (3) is communicated with the microorganism tank (4) through a first water discharging opening (34) arranged below the slag discharging area (33); a second aeration mechanism (41) and a medicament feeding mechanism (42) are arranged in the microorganism pool (4), and a second water outlet (43) communicated with the second sedimentation pool (5) is arranged at the upper end of the microorganism pool (4); a third water outlet (51) connected with the filtering tank (6) is arranged at the upper end of the second sedimentation tank (5), and a second sludge discharge port (52) is arranged in the bottom sedimentation zone; a pebble layer (61) and a zeolite layer (62) which are sequentially arranged along the water treatment direction are arranged in the filter tank (6); the first sludge discharge port (23) and the second sludge discharge port (52) are connected with a sludge treatment device (7) through a sludge pump.

2. The river drain sewage treatment plant of claim 1, wherein: the bottom of the first sedimentation tank (2) is provided with an inclined part (24) which is inclined upwards along the water treatment direction, and the first sludge discharge port (23) is arranged at the lower end of the inclined part (24).

3. The device for treating sewage at a drain outlet of a river channel as claimed in claim 2, wherein: the partition plate (21) is arranged at the 1/2-2/3 length of the first sedimentation tank, and gaps are arranged at the bottom of the partition plate (21) and the bottom of the first sedimentation tank (2).

4. The river drain sewage treatment plant of claim 1, wherein: a filter plate (35) is arranged in the slag discharge area (33), and a water outlet (36) communicated with the air floatation tank (3) is arranged below the filter plate (35).

5. The river drain sewage treatment plant of claim 1, wherein: baffle (44) are arranged at the position of microorganism pool (4) opposite to first drainage port (34), the length of baffle (44) is greater than 1/2 microorganism pool (4) width, baffle (44) and microorganism pool (4) inner wall constitute medicament mixing area (45), medicament feeding mechanism (42) is arranged in medicament mixing area (45).

6. The sewage treatment device for the sewage draining outlet of the river channel of claim 5, which is characterized in that: the medicament feeding mechanism (42) comprises two pipelines (421) for respectively feeding a microorganism water purifying agent and a microorganism growth promoting agent, a flow valve (422) is arranged on the pipeline (421), and multi-section fixed blades are further arranged inside the pipeline (421).

7. The device for treating sewage at a drain outlet of a river channel as claimed in claim 6, wherein: the first aeration mechanism (31) and the second aeration mechanism (41) are the same in structure and comprise main aeration pipes (311), branch aeration pipes (312) and aerators (313), wherein the main aeration pipes (311) are connected with an external air compressor, the branch aeration pipes (312) are arranged on two sides of the main aeration pipes (311) in a staggered mode, and the aerators (313) are arranged on the branch aeration pipes (312) and are microporous disc-shaped aerators.

8. The device for treating sewage at a sewage draining exit of a river channel as claimed in claim 7, wherein: biological balls (46) are further arranged in the microbial pool (4), and the biological balls (46) are positioned between the main aeration pipe (311) and the branch aeration pipe (312).