CN210974322U - Cold region domestic sewage treatment equipment - Google Patents

Abstract

The utility model discloses a cold district domestic sewage treatment device, include through the grid room (1), grit chamber (2), just heavy pond (3), anaerobism pond (4), oxygen deficiency pond (5), inner loop flow state bioreactor (6), two heavy ponds (7) and disinfection pond (8) that the pipeline connects gradually, be provided with first reflux unit (62) on inner loop flow state bioreactor (6) in order to link to each other with oxygen deficiency pond (5) be provided with aeration mechanism (61) of the aeration intensity of steerable different positions in inner loop flow state bioreactor (6). The utility model discloses a sewage treatment device has that the temperature disturbance resistance is strong, the total nitrogen clearance of low temperature is high, oxygen diffusion efficiency is higher, save aeration energy consumption, investment quota is low, a great deal of advantage such as running cost low.

Description

Cold region domestic sewage treatment equipment

Technical Field

The utility model relates to a sewage treatment device, in particular to a cold region domestic sewage treatment device which can adapt to the low water temperature of a cold region, and belongs to the field of sewage treatment.

Background

The water temperature in the cold region is as low as below 10 ℃ in the freezing period of 3-6 months, the day and night fluctuation of the water temperature of the sewage is large, and the water quality has the characteristic of low carbon-nitrogen ratio. Under the influence of the special conditions, the problem of low denitrification efficiency caused by complete inhibition of microbial nitrification often occurs in winter in urban sewage in cold regions, and the effluent cannot be stably discharged after reaching the standard.

Traditional urban sewage treatment plant technology generally relies on increasing material consumption or energy supply to improve the denitrification efficiency of low-temperature and low-carbon-nitrogen-ratio sewage. For example, the sludge age is prolonged to solve the problems of long generation cycle and slow growth rate of nitrobacteria at low temperature; an external carbon source (sodium acetate or ethanol) is used for supplementing an electron donor required by denitrification so as to improve the denitrification efficiency; the ammonia nitrogen oxidation efficiency is improved at the cost of increasing the aeration intensity of the aerobic section. Therefore, the traditional biological denitrification process has the technical problems of high operation cost and extensive operation control.

Therefore, the prior art needs to research and design a sewage treatment device capable of adapting to the winter temperature in the north.

For the above reasons, the present inventors have made intensive studies on the existing sewage treatment apparatus in order to design a new sewage treatment apparatus capable of solving the above problems.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problems, the inventor of the present invention has conducted intensive research and designed a cold region domestic sewage treatment apparatus, which replaces a conventional aerobic tank with an internal circulation flow state bioreactor, gradually acclimates activated sludge at a low water temperature (3-15 ℃) to improve its cold adaptability, forms a middle anoxic region and an outer aerobic region in the internal circulation flow state bioreactor, and has organic matter removal and denitrification in the same reactor.

Cold district domestic sewage treatment equipment include 1, grit chamber 2, just heavy pond 3, anaerobism pond 4, oxygen deficiency pond 5, inner loop flow state bioreactor 6, two heavy ponds 7 and disinfection pond 8 between the grid that connects gradually through the pipeline, be provided with first reflux unit 62 on the inner loop flow state bioreactor 6 in order to link to each other with oxygen deficiency pond 5.

Specifically, the grid room 1 is used for preliminary solid-liquid separation of sewage, and the existing grid room design can be selected according to the sewage source condition.

The grit chamber 2 is a vertical flow sedimentation tank, a grit chamber water inlet pipe 21 is positioned at the position close to the bottom of the grit chamber 2, a grit chamber water outlet pipe 22 is positioned at the position close to the top of the grit chamber 2, the ascending flow velocity of sewage in the grit chamber 2 is lower than 1mm/s,

preferably, a grit chamber maintenance pipe 23 is also arranged at the position of the grit chamber 2 close to the bottom,

the bottom of the primary sedimentation tank 3 is designed to be an inclined plane, a primary sedimentation tank water outlet pipeline 31 is arranged above the inclined plane, the primary sedimentation tank water outlet pipeline 31 is connected to the anaerobic tank 4 through a water pump,

a first filling mechanism 41 is arranged in the anaerobic tank 4 and is used as a carrier of facultative anaerobic zymophyte,

in a preferred embodiment, the first filling means 41 is a column with a plurality of holes 42, and the first filling means 41 has a plurality of holes uniformly distributed in the anaerobic tank 4,

an anaerobic tank water outlet pipe 43 is arranged at the bottom of the anaerobic tank 4 to be connected with the anoxic tank 5,

a second filling mechanism 52 with the same shape as the first filling mechanism 41 is arranged in the anoxic pond 5, an air pipeline is also arranged at the bottom or the side wall of the anoxic pond 5 to control the dissolved oxygen amount in the anoxic pond 5,

an anoxic pond water outlet pipe 51 is arranged on the anoxic pond 5 to be connected with the internal circulation fluid state bioreactor 6, the water outlet of the anoxic pond water outlet pipe 51 is arranged at the central position of the internal circulation fluid state bioreactor 6,

in the utility model, the internal circulation flow state bioreactor 6 is a circular pool, an aeration mechanism 61 is arranged in the internal circulation flow state bioreactor 6,

the aeration mechanism 61 comprises an aeration layer 611 and an air pipeline 6121, the aeration layer 611 comprises a plurality of aeration rings 612 which are arranged from inside to outside, the outer diameter of the aeration ring at the outer side of the aeration layer 611 is 90-95% of the inner diameter of the inner circulation flow state bioreactor 6,

in a preferred embodiment, the aeration rings 612 have ring structures with different diameters, the aeration rings 612 are coaxial, aeration holes 6111 are arranged on the aeration rings 612 to eject air,

preferably, the aeration holes 6111 have a plurality of holes, which are uniformly distributed on the aeration ring 612,

the inner part of the aeration ring 612 is provided with a pipeline which is connected with the aeration hole 6111, the pipelines in different aeration rings 612 are not communicated,

one end of the air pipe 6121 is connected with the aerator through a valve, the other end is connected with the pipe inside the aeration ring 612,

further, a plurality of air pipes 6121 are provided, each air pipe 6121 is respectively communicated with a different aeration ring 612,

further, the aeration layer 611 has a plurality of aeration layers 611, which are arranged in the inner circulation flow state bioreactor 6 in parallel up and down,

aeration layer connecting pipes 613 are arranged between the aeration layers 611, the aeration layer connecting pipes 613 are hollow tubular structures, and are connected with aeration rings 612 at corresponding positions on the adjacent aeration layers 611 through the hollow tubular structures,

preferably, a plurality of aeration layer connection pipes 613 are provided on each aeration ring 612, and the aeration layer connection pipes 613 are uniformly dispersed on the aeration ring 612 so that the aeration layer connection pipes 613 can support the fixed aeration ring 612.

In the utility model, the aeration mechanism 61 is covered with active filler to provide carrier for microorganism.

In the utility model, a first return pipeline 62 is also arranged on the internal circulation flow state bioreactor 6, the first return pipeline 62 is connected to the anoxic pond 5,

an inner circulation fluid state bioreactor water outlet pipe 64 is arranged at the edge position of the inner circulation fluid state bioreactor 6 to be connected with the secondary sedimentation tank 7,

a second return pipeline 71 is arranged on the secondary sedimentation tank 7, a secondary sedimentation tank outlet pipeline 72 is also arranged on the secondary sedimentation tank 7 to be connected with the disinfection tank 8,

the utility model provides a cold district domestic sewage treatment device has following beneficial effect:

(1) according to the domestic sewage treatment equipment in the cold region provided by the utility model, the temperature disturbance resistance is strong, and the low-temperature total nitrogen removal rate is high;

(2) according to the domestic sewage treatment equipment in the cold region, the oxygen diffusion efficiency is higher, and the aeration energy consumption is saved;

(3) according to the domestic sewage treatment equipment in the cold area, the investment limit is low, and the operation cost is low;

drawings

FIG. 1 is a schematic view showing an overall construction of a domestic sewage treatment apparatus for cold regions according to a preferred embodiment of the present invention;

FIG. 2 is a schematic view showing the construction of a grit chamber in a domestic sewage treatment facility for cold regions according to a preferred embodiment of the present invention;

FIG. 3 is a schematic view showing the structure of a primary sedimentation tank in a domestic sewage treatment facility for a cold region according to a preferred embodiment of the present invention;

FIG. 4 is a schematic structural view of a first packing mechanism in a domestic sewage treatment apparatus for cold regions according to a preferred embodiment of the present invention;

FIG. 5 is a schematic view showing the structure of an aeration mechanism in a domestic sewage treatment facility for cold regions according to a preferred embodiment of the present invention;

fig. 6 is a schematic structural view of an aeration mechanism in a domestic sewage treatment facility in a cold region according to a preferred embodiment of the present invention.

The reference numbers illustrate:

1-between grids;

2-a grit chamber;

21-a sand basin water inlet pipe;

22-a water outlet pipe of the grit chamber;

23-maintaining the pipe in the grit chamber;

3-primary settling tank;

31-a primary sedimentation tank water outlet pipeline;

4-an anaerobic tank;

41-a first packing mechanism;

42-holes;

43-water outlet pipe of anaerobic tank;

5-anoxic pond;

51-an anoxic tank water outlet pipe;

52-a second packing mechanism;

6-internal circulation flow state bioreactor;

61-an aeration mechanism;

611-an aeration layer;

6111-aeration hole;

612-aeration ring;

6121-air duct;

613-aeration layer connecting pipe;

62-a first return conduit;

64-water outlet pipe of the internal circulation fluid state bioreactor;

7-a secondary sedimentation tank;

71-a second return conduit;

72-secondary sedimentation tank outlet pipe;

8-a disinfection tank.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. The features and advantages of the present invention will become more apparent from the description.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

According to the utility model provides a pair of cold district domestic sewage treatment equipment, 1, grit chamber 2, just heavy pond 3, anaerobism pond 4, oxygen deficiency pond 5, inner loop flow state bioreactor 6, two heavy ponds 7 and disinfection pond 8 between the grid that connects gradually through the pipeline, be provided with first reflux unit 62 on the inner loop flow state bioreactor 6 in order to link to each other with oxygen deficiency pond 5.

Specifically, the grid room 1 is used for preliminary solid-liquid separation of sewage, and the existing grid room design can be selected according to the sewage source condition.

The grit chamber 2 is a vertical sedimentation tank, as shown in fig. 2, a grit chamber inlet pipe 21 is positioned near the bottom of the grit chamber 2, a grit chamber outlet pipe 22 is positioned near the top of the grit chamber 2,

further, sewage flows in from the sand basin inlet pipe 21 and flows upwards gradually in the sand basin 2, in the utility model, the rising flow velocity of the sewage in the sand basin 2 is lower than 1mm/s, so that the sludge with large mass can be precipitated,

preferably, a grit chamber maintenance pipe 23 is further provided near the bottom of the grit chamber 2 to facilitate the evacuation of the sewage remaining in the grit chamber 2 during maintenance.

The water outlet pipe 22 of the grit chamber is connected with the primary sedimentation tank 3, so that the sewage can enter the primary sedimentation tank 3 for sedimentation,

the bottom of the primary sedimentation tank 3 is designed to be an inclined plane, as shown in figure 3, so that the sludge precipitated in the primary sedimentation tank 3 can flow to the low-lying part of the primary sedimentation tank 3 under the action of gravity, the maintenance and the cleaning of the sludge in the primary sedimentation tank 3 are convenient,

a primary sedimentation tank water outlet pipeline 31 is arranged above the inclined plane of the primary sedimentation tank 3, and the primary sedimentation tank water outlet pipeline 31 is connected to the anaerobic tank 4 through a water pump.

The anaerobic tank 4 is used for decomposing biodegradable organic matters in the sewage and converting the biodegradable organic matters into micromolecule fermentation products such as Volatile Fatty Acid (VFA) and the like, thereby reducing the content of the organic matters in the sewage,

a first filling mechanism 41 is arranged in the anaerobic tank 4 and is used as a carrier of facultative anaerobic zymophyte, the first filling mechanism 41 is made of active filling,

the active filler is a novel bioactive carrier, is formed by fusing multiple trace elements which are beneficial to quick attachment and growth of microorganisms into a high polymer material according to different sewage properties, modifying and constructing through a special process, and has the advantages of large specific surface area, good hydrophilicity and high bioactivity.

The utility model discloses in, active filler does not have special requirement, can be any kind of filler known, only need for the microorganism depend on provide the carrier can, like active ripple filler, fluidized bed filler, three-dimensional elastic filler etc..

In a preferred embodiment, as shown in fig. 4, the first filling means 41 is a column shape having a plurality of holes 42, and the first filling means 41 has a plurality of holes uniformly distributed in the anaerobic tank 4, so as to increase the contact area between the sewage in the anaerobic tank 4 and the anaerobic bacteria, thereby achieving a better effect of decomposing organic matters in the sewage.

An anaerobic tank water outlet pipe 43 is arranged on the anaerobic tank 4 to be connected with the anoxic tank 5, furthermore, a water pump is arranged on the anaerobic tank water outlet pipe 43 to discharge sewage from the anaerobic tank 4 into the anoxic tank 5,

the anoxic pond 5 is used for carrying out denitrification and decarbonization on the sewage, a second filler mechanism 52 with the same shape as the first filler mechanism 41 is arranged in the anoxic pond, the second filler mechanism 52 is used for providing a carrier for denitrifying bacteria, preferably, an air pipeline is also arranged at the bottom or on the side wall of the anoxic pond 5 so as to control the dissolved oxygen in the anoxic pond 5,

an anoxic tank outlet pipe 51 is arranged in the anoxic tank 5 to be connected with the internal circulation flow state bioreactor 6, sewage containing lower-concentration carbon nitrogen and higher-concentration phosphorus enters the internal circulation flow state bioreactor 6 after passing through the anoxic tank 5,

further, the water outlet of the water outlet pipe 51 of the anoxic tank is arranged at the center of the internal circulation flow state bioreactor 6, so that the sewage in the anoxic tank 5 is firstly discharged to the center of the internal circulation flow state bioreactor 6.

The internal circulation flow state bioreactor 6 is used for dephosphorizing, ammoniating and nitrifying the sewage after denitrification and decarbonization, microorganisms in the internal circulation flow state bioreactor 6 can carry out a series of decomposition on the sewage under the aerobic condition,

in the utility model, the internal circulation flow state bioreactor 6 is a circular pool, an aeration mechanism 61 is arranged in the internal circulation flow state bioreactor 6,

the aeration mechanism 61 comprises an aeration layer 611 and an air pipe 6121,

the aeration layer 611 comprises a plurality of aeration rings 612 arranged from inside to outside, as shown in fig. 6, the outer diameter of the aeration ring 612 at the outermost side of the aeration layer 611 is slightly smaller than the inner diameter of the internal circulation flow state bioreactor 6, preferably 90% -95% of the inner diameter of the internal circulation flow state bioreactor 6, so that the range of air sprayed by the aeration layer 611 can cover all areas with corresponding height in the internal circulation flow state bioreactor 6,

in a preferred embodiment, the aeration ring 612 has an annular structure with different diameters, and in the same aeration layer, the aeration rings 612 are coaxially arranged, as shown in fig. 5 and 6, aeration holes 6111 are provided on the aeration ring 612 to eject air,

preferably, the aeration holes 6111 have a plurality of holes uniformly distributed on the aeration ring 612, so that the aeration ring 612 can uniformly spray the gas,

the inner part of each aeration ring 612 is provided with a pipeline which is connected with the aeration holes 6111, the inner pipelines of different aeration rings 612 are not communicated,

one end of the air pipe 6121 is connected with the aerator through a valve, the other end is connected with the pipe inside the aeration ring 612,

furthermore, the number of the air pipes 6121 is multiple, and each air pipe 6121 is respectively communicated with a different aeration ring 612, so that the amount of air sprayed by the different aeration rings 612 is controllable, and further the aeration amount at different positions on the aeration layer 611 is controllable.

Further, the aeration layers 611 are provided in a plurality and are disposed in parallel up and down in the internal circulation flow state bioreactor 6, as shown in fig. 5, to increase oxygen diffusion efficiency, so that the aeration amount of the oxygen content at different heights in the internal circulation flow state bioreactor 6 can be controlled, and further the aeration amount at different positions in the internal circulation flow state bioreactor 6 can be controlled.

Aeration layer connecting pipes 613 are arranged between the aeration layers 611, the aeration layer connecting pipes 613 are hollow tubular structures, and are connected with aeration rings 612 at corresponding positions on the adjacent aeration layers 611 through the hollow tubular structures,

preferably, a plurality of aeration layer connection pipes 613 are provided on each aeration ring 612, and the aeration layer connection pipes 613 are uniformly dispersed on the aeration ring 612 so that the aeration layer connection pipes 613 can support the fixed aeration ring 612.

In the utility model, the aeration mechanism 61 is covered with active filler to provide carrier for microorganism.

In the utility model, the control of the sludge concentration of the biochemical tank is realized by controlling the aeration mechanism 61, thereby solving the problem of poor water outlet effect when the sewage treatment system operates at low temperature,

when the water temperature is higher than 15 ℃, the valve connected with the air pipeline 6121 is normally opened, the internal circulation fluid state bioreactor 6 plays the role of an oxidation pond,

when the water temperature is reduced to below 15 ℃, the microbial activity is obviously reduced to reduce the decomposition and nitration reaction rate of the organic matters, at the moment, a valve connected with an air pipeline 6121 is closed or reduced, so that the aeration ring 612 near the center of the aeration layer 611 stops aeration or reduces the aeration amount, further leading the central area of the internal circulation fluid state bioreactor 6 to form an anoxic area, thereby forming a denitrification environment, and leading the central area of the internal circulation fluid state bioreactor 6 to be in a static sedimentation state because the aeration is stopped at the central area of the aeration layer 611, so that the sludge which is supposed to be settled in the secondary sedimentation tank is settled in the internal circulation fluid state bioreactor 6, the concentration of the activated sludge in the internal circulation flow state bioreactor 6 is increased, the biomass in the reactor is improved, thereby improving the processing capacity of the microorganism under the low water temperature condition, achieving the effect of effective decontamination,

further, the valve controlling the aeration ring 612 in the central area can be opened intermittently to form an internal circulation in the internal circulation flow state bioreactor 6, so that the decontamination effect is better.

The design of the aeration mechanism 61 consisting of the aeration rings 612 with different diameters realizes the gradual domestication of the activated sludge in the internal circulation flow state bioreactor 6 to improve the cold adaptability thereof, and forms a middle anoxic zone and an outer ring aerobic zone, and the organic matter removal and denitrification effects are realized in the same reactor.

Compared with a complete aerobic tank, the internal circulation flow state bioreactor 6 has strong temperature disturbance resistance, higher oxygen diffusion efficiency and 25% of aeration energy consumption saving. The low-temperature total nitrogen removal rate is higher than 80%, and is superior to the first-grade A standard of sewage discharge.

The utility model discloses in on the inner loop flow state bioreactor 6, still be provided with first return line 62, first return line 62 is connected to oxygen deficiency pond 5 for sewage in the inner loop flow state bioreactor 6 can flow back to in the oxygen deficiency pond 5 according to a certain proportion, thereby make the denitrifying bacteria in the oxygen deficiency pond 5 utilize from inner loop flow state bioreactor 6 in the organic matter in a large amount of nitrates that the backward flow brought and the sewage carry out denitrification reaction, reach the purpose of decarbonization and denitrogenation simultaneously, preferably, 62 border positions of first return line.

An inner circulation fluid state bioreactor water outlet pipe 64 is arranged at the edge position of the inner circulation fluid state bioreactor 6 to be connected with the secondary sedimentation tank 7,

the secondary sedimentation tank 7 is used for collecting sludge in the sewage treated by the internal circulation flow state bioreactor 6, and a second return pipeline 71 is arranged on the secondary sedimentation tank 7, so that part of the sludge collected by the secondary sedimentation tank 7 returns to the anaerobic tank 4 to continuously participate in phosphorus release, and the concentration of activated sludge in the system is kept.

A secondary sedimentation tank water outlet pipeline 72 is arranged on the secondary sedimentation tank 7 to be connected with the disinfection tank 8, and sewage enters the disinfection tank 8 through the secondary sedimentation tank 7 and is disinfected to finish the treatment.

The present invention has been described above in connection with preferred embodiments, which are merely exemplary and illustrative. On this basis, can be right the utility model discloses carry out multiple replacement and improvement, these all fall into the utility model discloses a protection scope.

Claims (10)

1. A domestic sewage treatment device in cold regions, which is characterized in that,

comprises a grid room (1), a grit chamber (2), a primary sedimentation tank (3), an anaerobic tank (4), an anoxic tank (5), an internal circulation flow state bioreactor (6), a secondary sedimentation tank (7) and a disinfection tank (8) which are connected in sequence through pipelines, wherein a first reflux device (62) is arranged on the internal circulation flow state bioreactor (6) to be connected with the anoxic tank (5),

the internal circulation flow state bioreactor (6) is a circular pool,

an aeration mechanism (61) is arranged in the internal circulation fluid state bioreactor (6), the aeration mechanism (61) comprises an aeration layer (611) and an air pipeline (6121),

the aeration layer (611) comprises a plurality of aeration rings (612) which are arranged from inside to outside, a plurality of aeration holes (6111) are arranged on the aeration rings (612), pipelines are arranged in the aeration rings (612) and connected with the aeration holes (6111), the pipelines in different aeration rings (612) are not communicated,

one end of the air pipeline (6121) is connected with the aerator through a valve, the other end is connected with the pipeline inside the aeration ring (612),

the number of the air pipelines (6121) is multiple, and each air pipeline (6121) is respectively communicated with different aeration rings (612), so that the aeration amount at different positions on the aeration layer (611) can be controlled.

2. The cold region domestic sewage treatment apparatus according to claim 1,

the aeration layers (611) are arranged in the internal circulation flow state bioreactor (6) in parallel up and down, so that aeration amounts at different heights in the internal circulation flow state bioreactor (6) can be controlled.

3. The cold region domestic sewage treatment apparatus according to claim 2,

the outer diameter of the outermost aeration ring in the aeration layer (611) is 90-95% of the inner diameter of the inner circulation flow state bioreactor (6),

aeration layer connecting pipes (613) are arranged between the aeration layers (611), the aeration layer connecting pipes (613) are of hollow tubular structures, and aeration rings (612) at corresponding positions on the adjacent aeration layers (611) are connected through the hollow tubular structures.

4. The cold region domestic sewage treatment apparatus according to claim 3,

the aeration rings (612) are of annular structures, and the aeration rings (612) with different diameters are arranged coaxially in the same aeration layer.

5. The cold region domestic sewage treatment apparatus according to claim 4,

each aeration ring (612) is provided with a plurality of aeration layer connecting pipes (613), and the aeration layer connecting pipes (613) are uniformly dispersed on the aeration ring (612), so that the aeration ring (612) is more stable.

6. The cold region domestic sewage treatment apparatus according to claim 1,

the surface of the aeration mechanism (61) is coated with active filler which is used as a carrier of microorganism,

an anoxic pond water outlet pipe (51) is arranged in the anoxic pond (5) and is connected with the internal circulation flow state bioreactor (6), and a water outlet of the anoxic pond water outlet pipe (51) is arranged at the central position of the internal circulation flow state bioreactor (6).

7. The cold region domestic sewage treatment apparatus according to claim 1,

a grit chamber water inlet pipe (21), a grit chamber water outlet pipe (22) and a grit chamber maintenance pipe (23) are arranged on the grit chamber (2),

the water inlet pipe (21) of the grit chamber is positioned at the position of the grit chamber (2) close to the bottom, the water outlet pipe (22) of the grit chamber is positioned at the position of the grit chamber (2) close to the top,

a sand basin maintenance pipe (23) is arranged at the position of the sand basin (2) close to the bottom,

the bottom of the primary sedimentation tank (3) is an inclined plane, a primary sedimentation tank water outlet pipeline (31) is arranged above the inclined plane, the primary sedimentation tank water outlet pipeline (31) is connected to the anaerobic tank (4) through a water pump,

a second return pipeline (71) is arranged on the secondary sedimentation tank (7) and returns part of sludge collected by the secondary sedimentation tank (7) to the anaerobic tank (4).

8. The cold region domestic sewage treatment apparatus according to claim 1,

a first filling mechanism (41) is arranged in the anaerobic tank (4), and a carrier is provided for facultative anaerobic zymogens through the first filling mechanism.

9. The sewage treatment equipment in the cold region according to claim 8,

the first filling mechanism (41) is columnar and is provided with a large number of holes (42), and the first filling mechanism (41) is provided with a plurality of holes which are uniformly dispersed in the anaerobic tank (4).

10. The sewage treatment equipment in the cold region according to claim 9,

a second filling mechanism (52) which is the same as the first filling mechanism (41) is arranged in the anoxic tank (5), and an air pipeline is arranged at the bottom or the side wall of the anoxic tank (5) to control the dissolved oxygen amount in the anoxic tank (5).

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