CN220502805U - A bacterial-charcoal coupled enhanced saline domestic sewage treatment system - Google Patents

Abstract

The utility model discloses a bacterial-charcoal coupling enhanced salt-containing domestic sewage treatment system, which comprises a water inlet tank, a first reaction tank, a first water collecting tank, a second reaction tank, a second water collecting tank, a charcoal adding tank, a mud collecting tank and a gas collecting tank which are sequentially connected through pipelines; the carbon adding box is connected with the first reaction tank through a pipeline, the top of the second reaction tank is connected to the gas collecting box through a pipeline, and the bottoms of the first reaction tank and the second reaction tank are connected to the mud collecting tank through pipelines; the first reaction tank and the second reaction tank are respectively inoculated with aerobic activated sludge and anaerobic granular sludge, and the charcoal adding box is filled with biochar; an aeration component and a stirring component are also arranged in the first reaction tank. The sewage treatment system forms a fungus-carbon coupling body by reasonably arranging and distributing the biological carbon and the activated sludge, and then cooperates with the action of anaerobic granular sludge, so that the efficient removal of pollutants in the salty domestic sewage is realized under the condition of no need of adding chemical agents, and the sewage treatment system has the advantages of good sewage treatment effect, low operation cost, small secondary pollution and the like.

Description

A bacterial-charcoal coupled enhanced saline domestic sewage treatment system

Technical field

The utility model belongs to the technical field of sewage treatment, relates to a saline sewage treatment system, and specifically relates to a bacterial carbon coupling enhanced saline domestic sewage treatment system.

Background technique

Our country is a country with very short freshwater resources, uneven spatial distribution, and low per capita occupancy. In recent years, freshwater resources have become increasingly scarce. Many coastal areas have begun to divert seawater to replace domestic water with low requirements, and the domestic sewage produced will be converted into Salty domestic sewage. Secondly, the current printing, chemical, seafood, papermaking, oil and natural gas processing and other industries, as well as the use of seawater irrigation in many coastal cities, produce a large amount of salty sewage that is discharged into urban sewage treatment plants along with the urban pipe network, causing domestic sewage pollution. The salt content is too high. Salty sewage is produced in a wide range of ways and the amount of water is increasing year by year, causing hidden water pollution, air pollution, and soil pollution for a long time. In addition, it was found that most food processing plants face a common problem, that is, the salt content in domestic sewage seriously exceeds the standard, and the complex components in it are extremely difficult to process. This not only brings problems to the sewage treatment station of the plant. This has caused great trouble. If it is not handled properly and is discharged into the municipal pipe network, it will also bring great hidden dangers to urban sewage treatment plants. How to effectively treat saline domestic sewage has become a focus and research hotspot in the field of sewage treatment.

Due to the different sources and salt content of saline domestic sewage, the treatment methods and results are also different. According to different treatment principles, the current mainstream salty sewage treatment methods include physical methods, chemical methods, biological methods, etc. Different methods have their own advantages and disadvantages. On the condition that the purification effect is met, minimizing the cost as much as possible is the ultimate goal of current salty sewage treatment. Common physical treatment methods mainly include distillation desalination, multi-effect evaporation, mechanical compression evaporation, membrane distillation, membrane treatment, etc. Common chemical treatment methods mainly include ion exchange, electrodialysis, deep oxidation and incineration. Law and other categories. The biological treatment method uses the characteristics of microorganisms to transform pollutants in sewage. Compared with physical and chemical methods, it has lower cost and less secondary pollution. In recent years, it has been favored by researchers, and a lot of exploration and improvement have been carried out on it. , mainly including activated sludge method, biofilm method, combined treatment method, etc. However, when the salt content in domestic sewage is too high, the growth and reproduction of microorganisms are inhibited, which will have a greater impact on the biological treatment effect, thereby affecting the purification effect of the biological treatment system and causing substandard discharge of sewage treatment. Therefore, traditional biological treatment processes are difficult to meet the purification needs of saline domestic sewage. If a new saline domestic sewage treatment system can be developed to solve this problem, it will have good application prospects.

Utility model content

In view of the technical problem that traditional biological treatment processes are difficult to meet the purification needs of saline domestic sewage, the purpose of this utility model is to solve the above problems and provide a bacteria-charcoal coupling enhanced saline domestic sewage treatment system. The sewage treatment system is reasonably configured The layout uses biochar and activated sludge to form a bacterial-charcoal coupling body, and then cooperates with the effect of anaerobic granular sludge to achieve efficient removal of pollutants in salty domestic sewage without the need for external chemicals, and has sewage treatment capabilities It has the advantages of good effect, low operating cost and low secondary pollution.

In order to solve the above technical problems, the utility model provides a bacterial carbon coupling enhanced salt-containing domestic sewage treatment system, which includes an inlet pool, a reaction pool one, a collection pool one, a reaction pool two, and a collection pool two that are connected in sequence through pipelines. As well as a carbon adding box, a mud collecting tank, and a gas collecting box; the carbon adding box is connected to the first reaction tank through a pipeline, the top of the reaction tank two is connected to the gas collecting box through a pipeline, and the bottoms of the reaction tank one and the second reaction tank are both connected through a pipeline. The pipeline is connected to the sludge collecting tank;

The reaction pool one and reaction pool two are respectively inoculated with aerobic activated sludge and anaerobic granular sludge, and the carbon adding box is filled with biochar, and the biochar can be added into the reaction pool one through a pipeline; The reaction tank 1 is also equipped with an aeration component and a stirring component;

The sewage to be treated enters the reaction pool one from the inlet pool, flows out from the upper part of the reaction pool one, passes through the collection pool one and enters the reaction pool two from the lower part of the reaction pool two, and finally flows out from the upper part of the reaction pool two into the collection pool two.

In the technical solution of the above-mentioned bacterial carbon coupled enhanced salt-containing domestic sewage treatment system, the aeration component is used in the aeration stage to aerate and oxygenate the reaction tank one, so that the dissolved oxygen concentration reaches the control range, so that the reaction tank one can The sewage, aerobic activated sludge and biochar are thoroughly mixed. The aeration component can use conventional aeration equipment in the field. In the present invention, the aeration component includes a microporous aeration disk disposed at the bottom of the reaction tank. The microporous aeration disk is connected to the outside of the reaction tank. The aerators are connected through pipelines, turn on the aerator, and aerate and oxygenate reaction tank 1 through the microporous aeration disk.

In the technical solution of the above-mentioned bacterial carbon coupled enhanced salt-containing domestic sewage treatment system, the role of the stirring component is to stir the reaction liquid in the reaction tank one during the stirring stage. The usually stirring speed is 50-160r/min, which can be achieved by reverse reaction. Nitrification removes part of the nitrate nitrogen or nitrite nitrogen produced during the aeration stage, and this process also further consumes part of the organic matter. The stirring component can use conventional stirring equipment in the field. In the present invention, the stirring component includes a stirrer, and the stirring end of the stirrer is located below the liquid level of reaction tank one.

In the technical solution of the above-mentioned bacterial carbon coupled enhanced salt-containing domestic sewage treatment system, in order to further ensure the effluent quality of the reaction tank one, a decanter is preferably installed in the reaction tank one, and the collection tank one is connected with the decanter The water outlets of the devices are connected through pipelines. A drain valve is also provided on the pipeline between the first water collection tank and the water outlet of the decanter.

In the technical solution of the above-mentioned bacterial carbon coupled enhanced salt-containing domestic sewage treatment system, in order to facilitate the inlet and metering of sewage, a metering pump 1 and a relay are preferably provided on the pipeline between the inlet pool and the reaction pool 1. A metering pump two is preferably provided on the pipeline between the first collection tank and the second reaction tank.

In the technical solution of the above-mentioned biochar-coupled enhanced salt-containing domestic sewage treatment system, because biochar has a huge specific surface area, rich pore structure, and good adsorption and carrier functions, it can quickly absorb pollutants in sewage. At the same time, it can also provide a carrier for the attachment and growth of aerobic activated sludge, forming a tiny bacteria-carbon coupling body, which can effectively resist the inhibition or impact of salt, thereby achieving the removal of organic matter, nitrogen, phosphorus and other pollutants in sewage. Among them, organic matter It can be removed through the decomposition of aerobic microorganisms, ammonia nitrogen can be removed through nitrification, and phosphorus pollutants can be removed through adsorption or microbial assimilation. It should be noted that this utility model has no special restrictions on the type of biochar. It can be purchased commercially or made in the laboratory. Its dosage concentration and frequency can also be adjusted according to actual needs. In the present utility model, the biochar filled in the charcoal box includes but is not limited to one or more of rape straw biochar, rice straw biochar, and wheat straw biochar. The dosage concentration is usually controlled at 0.5-5g/ L, add once every 3 to 40 days. A carbon adding valve is also provided on the pipeline between the carbon adding box and reaction pool one.

In the technical solution of the above-mentioned bacterial carbon coupled enhanced salt-containing domestic sewage treatment system, the inoculation amount of aerobic activated sludge in the reaction tank is 5% to 50% of the volume of the reaction tank, and the inoculation amount is preferably 20% to 30% of a volume. There is a sludge discharge valve 1 on the pipeline between the sludge collection tank and the sludge discharge port 1 of the reaction tank 1. During the idle period, the sludge discharge valve 1 can be opened in time to allow the sludge to enter the sludge collection tank from the sludge discharge port 1. , so as to keep the volume proportion of anaerobic granular sludge in reaction tank 2 at 5% to 50%, and further preferably at 20% to 30%.

In the above technical solution of the bacterial carbon coupled enhanced salt-containing domestic sewage treatment system, the inoculation amount of the anaerobic granular sludge in the second reaction tank is preferably 20% to 70% of the volume of the second reaction tank, and the inoculation amount is preferably 45% to 50% of the volume of Pool 2. There is a sludge discharge valve 2 on the pipeline between the sludge collection tank and the reaction tank 2. Open the sludge discharge valve 2 in a timely manner so that the sludge in the reaction tank 2 enters the sludge collection tank from the sludge discharge port 2 to maintain anaerobic conditions. The volume proportion of granular sludge in reaction tank 2 is 20% to 70%, and is further preferably maintained at 45% to 50%.

The bacterial-charcoal coupling enhanced salt-containing domestic sewage treatment system provided by the utility model has the following beneficial effects:

(1) Good treatment effect: By adding biochar to the reaction tank one to form a bacterial-charcoal coupling body, which has good adsorption performance and can quickly and selectively adsorb pollutants from salty sewage, thereby reducing the impact of salinity on microorganisms. At the same time, more tiny and stable biofilm structures are formed on the bacterial charcoal coupling body, thereby increasing the diversity and richness of microorganisms, enhancing their ability to withstand salinity shocks, and providing efficient transformation of pollutants for microorganisms. A more favorable location. The anaerobic granular sludge in the second reaction tank also has good resistance to salinity impact. Because it has a certain thickness, the salinity cannot easily enter its interior, so it can still achieve good anaerobic performance under higher salinity. biological treatment effects.

(2) Low operating cost: The biochar in the carbon adding box is one or more of rape straw biochar, rice straw biochar, wheat straw biochar, and the biochar raw materials are rape straw, rice straw, wheat straw and other waste Straw has low cost of raw material collection and carbon production. The dosage concentration is only 0.5~5g/L. It is added every 3~40 days. The dosage is low and can be recycled and reused. Therefore, the salt resistance is greatly reduced when treating salty domestic sewage. The cost of impact. In addition, the bacterial carbon coupling body in the reaction tank one and the anaerobic granular sludge in the reaction tank two have a longer growth cycle than the flocculent sludge, so the remaining sludge production is relatively lower, and the cost of treating the remaining sludge is Reduced somewhat.

(3) Less secondary pollution: First, biochar and activated sludge are used to form a bacterial-charcoal coupling body, and then synergize with the effect of anaerobic granular sludge to achieve pollution control in saline domestic sewage without the need for external chemicals. The efficient removal of pollutants reduces the possibility of secondary pollution caused by improper chemical dosing; secondly, the system produces less residual sludge, and the secondary pollution caused by the residual sludge treatment process is also relatively less.

Description of the drawings

Figure 1 is a schematic structural diagram of the utility model's bacterial carbon coupling enhanced saline domestic sewage treatment system.

Explanation of reference signs: 1. Inlet tank; 2. Carbon adding box; 3. Reaction tank one; 4. Collection tank one; 5. Mud collection tank; 6. Reaction tank two; 7. Gas collecting tank; 8. Collection tank. Two; 9. Water inlet one; 10. Mud discharge port one; 11. Mixer; 12. Decanter; 13. Microporous aeration plate; 14. Aerator; 15. Water inlet two; 16. Mud discharge Port two; 17. Exhaust port; 18. Drain port; 19. Metering pump one; 20. Relay; 21. Carbon adding valve; 22. Drainage valve; 23. Mud discharge valve one; 24. Metering pump two; 25. Mud drain valve 2.

Detailed ways

The technical solutions of each embodiment of the present utility model will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without any creative efforts belong to the present utility model.

The bacterial carbon coupling enhanced saline domestic sewage treatment system provided by this embodiment, as shown in Figure 1, includes an inlet tank 1, a carbon adding box 2, a reaction tank 3, a collection tank 4, a mud collection tank 5, and a reaction tank 2.6. Gas collecting box 7. 2.Collection tank 2.8.

A water inlet 9 is provided above one side of the reaction tank 3, and a mud discharge port 10 is provided below the bottom of the reaction tank 3. The reaction tank 3 is provided with a stirring assembly and a decanter 12 inside. In this embodiment, the stirring component is a stirrer 11, and the stirring end of the stirrer 11 extends below the liquid surface. The reaction tank one 3 is also provided with an aeration component. The aeration component includes a microporous aeration disk 13 arranged at the bottom of the reaction tank one 3. The microporous aeration disk 13 and the aerator 14 outside the reaction tank one 3 are connected through a pipe. The roads are connected. The reaction tank one 3 is inoculated with aerobic activated sludge, and the inoculation amount of the aerobic activated sludge in the reaction tank one 3 is 5% to 50% of the volume of the reaction tank one 3. In this embodiment, the inoculum amount of aerobic activated sludge in reaction tank one 3 is 20% to 30% of the volume of reaction tank one 3.

The inlet pool 1 and the water inlet 9 on the reaction pool 3 are connected through a pipeline, and a metering pump 19 and a relay 20 are provided on the pipeline.

The carbon adding box 2 and the reaction pool 1 are connected through a pipeline. A carbon adding valve 21 is provided on the pipeline, and the outlet at one end of the pipeline extends below the liquid level. The carbon adding box 2 is filled with one or more types of rape straw biochar, rice straw biochar, and wheat straw biochar, with a dosage concentration of 0.5 to 5 g/L, and is added every 3 to 40 days. In this embodiment, the carbon adding box 2 is filled with rape straw biochar, and the dosage concentration is 0.8-3g/L, and is added every 10-15 days.

Biochar can be purchased commercially or homemade. In this embodiment, biochar is obtained in a self-made manner. Specifically, the preparation methods of rape straw biochar, rice straw biochar, and wheat straw biochar are as follows: using waste rape straw, rice straw, or wheat straw as raw materials respectively, washing and drying Then it was crushed and passed through an 80-mesh sieve, put into a crucible for compaction, and then sent into a muffle furnace. It was heated to 650°C with a temperature rise gradient of 14°C/min, and then kept at a constant temperature for 2 hours. After cooling, take out the pyrolysis product and wash it with tap water until the pH of the supernatant is stable. After suction filtration, take the filter residue and dry it at 105°C. After cooling, pass it through a 100-mesh sieve to obtain rape straw biochar and rice straw respectively. Biochar, wheat straw biochar, stored for later use.

A water inlet 15 is provided below one side of the reaction tank 6, and a drainage outlet 18 is provided above one side of the reaction tank 6. There is a mud discharge port 2 16 below the bottom of the reaction tank 2 6 . The top of the reaction tank 6 is provided with an exhaust port 17. The reaction tank 26 is inoculated with anaerobic granular sludge, the particle size of the anaerobic granular sludge is 1 to 4 mm, and the inoculation amount is 20% to 70% of the volume of the reaction tank 26. In this embodiment, reaction tank 2 6 is inoculated with anaerobic granular sludge, the particle size of the anaerobic granular sludge is 1 to 4 mm, and the inoculation amount is 45% to 50% of the volume of reaction tank 2 6 .

The water collection tank 4 and the water outlet of the decanter 12 are connected through a pipeline, and a drain valve 22 is provided on the pipeline. The water inlet two 15 of the water collecting tank one 4 and the reaction tank two 6 are connected through a pipeline, and a metering pump two 24 is provided on the pipeline. The mud collection tank 5 and the mud discharge port 10 of the reaction tank 3 are connected through a pipeline, and a mud discharge valve 23 is provided on the pipeline. The mud collection tank 5 and the mud discharge port 216 of the reaction tank 26 are connected through a pipeline, and a mud discharge valve 25 is provided on the pipeline.

The gas collecting box 7 and the exhaust port 17 of the reaction tank 2 are connected through pipelines. The water collecting tank 8 and the drainage outlet 18 of the reaction tank 6 are connected through pipelines.

The working process of the bacterial carbon coupled enhanced saline domestic sewage treatment system provided in this embodiment is as follows:

The sewage is stored in the inlet pool 1 and enters the reaction pool 3 from the water inlet 9 along the pipeline. The water inlet flow is controlled through the metering pump 19 and the water inlet time is controlled through the relay 20. Reaction tank 13 adopts sequential batch operation mode, running 1 to 3 cycles every day, and each cycle runs for 8 to 24 hours, including: water inlet for 10 minutes, aeration for 5 to 21 hours, stirring for 1 hour, sedimentation for 1 hour, drainage for 20 minutes, and idle 0.5h. In this embodiment, reaction tank 1 3 adopts the sequential batch operation mode, running 2 cycles every day, and each cycle runs for 12 hours, specifically including: 10 minutes of water inflow, 9 hours of aeration, 1 hour of stirring, 1 hour of sedimentation, 20 minutes of drainage, and 0.5 hours of idle time. h. During the water inlet stage, the carbon adding valve 21 is opened, allowing the biochar to enter the reaction pool 3 from the carbon adding box 2 along the pipeline. Sewage, aerobic activated sludge and biochar coexist in reaction tank 1-3. During the aeration stage, the aerator 14 is turned on, and the reaction tank 13 is aerated and oxygenated through the microporous aeration disk 13. The dissolved oxygen concentration is 3-5 mg/L, so that the sewage and oxygen in the reaction tank 3 are aerobic. Activated sludge and biochar are thoroughly mixed.

Because biochar has a huge specific surface area, rich pore structure, and good adsorption and carrier functions, it can quickly absorb pollutants in sewage. It can also provide a carrier for the attachment and growth of aerobic activated sludge, forming tiny The bacterial carbon coupling body can effectively resist the inhibition or impact of salt, thereby achieving the removal of organic matter, nitrogen, phosphorus and other pollutants in sewage. Organic matter can be removed through the decomposition of aerobic microorganisms, and ammonia nitrogen can be removed through nitrification. Being removed, phosphorus contaminants can be removed by adsorption or microbial assimilation. During the stirring stage, close the aerator 14, open the stirrer 11, and the stirring speed is 100r/min. Part of the nitrate nitrogen or nitrite nitrogen produced in the aeration stage can be removed through denitrification, and this process will also further consume it. Some organic matter. During the settling stage, the agitator 11 is turned off and the sludge and sewage are separated by standing still. In the drainage stage, the drain valve 22 is opened, and the sewage flows from the decanter 12 into the water collecting tank 4 along the pipeline. During the idle stage, the sludge discharge valve 23 is opened in a timely manner, so that the sludge enters the sludge collecting tank 5 from the sludge discharge port 10 to maintain the suspended solids concentration of the mixed liquid in the reaction tank 3 at 3000-3500 mg/L. Under the action of metering pump two 24, the sewage in the collection tank one 4 flows from the water inlet two 15 into the reaction tank two 6 along the pipeline. Reaction tank 26 is inoculated with anaerobic granular sludge. After the sewage comes into contact with the anaerobic granular sludge, the remaining organic matter, nitrogen, phosphorus and other pollutants in the sewage can be further removed by anaerobic microorganisms, and the organic matter can be used as denitrifying carbon. Nitrate nitrogen or nitrite nitrogen can be removed by converting it into gaseous nitrogen through denitrification, and phosphorus pollutants can be removed through adsorption or microbial assimilation. The gas generated in reaction pool 2 6 enters the gas collection box 7 through the exhaust port 17 , and the treated water enters the water collection tank 2 8 through the drainage port 18 . Open the sludge discharge valve 225 in a timely manner to allow the sludge in the reaction tank 26 to enter the sludge collecting tank 5 from the sludge discharge port 216 to keep the volume proportion of anaerobic granular sludge in the reaction tank 26 at 45%. ~50%.

Application examples

This application example uses actual salt-containing domestic sewage from a food processing factory in Pidu District, Chengdu City for treatment, and the treatment water volume is 50L/d. The mass concentrations of influent chemical oxygen demand (COD), five-day biochemical oxygen demand (BOD ₅ ), ammonia nitrogen (NH ₄ ⁺ -N), total nitrogen (TN), and total phosphorus (TP) are 290.2 to 351.6 mg respectively. /L, 234.5~266.2mg/L, 25.6~35.4mg/L, 29.1~45.8mg/L, 2.5~3.7mg/L, the salinity (based on NaCl mass fraction) was adjusted to 0.5%, 1%, 1.5 respectively %, 2%, the ambient temperature is 25-30°C during operation, and it operates stably for 60 days. The inlet and outlet water quality indicators (COD, BOD ₅ , NH ₄ ⁺ -N, TN, TP) are monitored every day. The biochar dosage and dosage intervals under different salinity conditions are shown in Table 1. The corresponding COD, BOD ₅ , NH ₄ ⁺ -N, TN, and TP removal conditions during stable operation are shown in Tables 2 to 5. Show.

Table 1 Biochar dosage and dosage frequency under different salinity conditions

serial number salinity(%) Biochar dosage (g/L) Biochar dosing time interval (days) 1 0.5 0.8 15 2 1 1.5 15 3 1.5 2.5 10 4 2 3 10

Table 2 Removal of pollutants during stable operation (salinity is 0.5%)

Table 3 Removal of pollutants during stable operation (salinity is 1%)

Table 4 Removal of pollutants during stable operation (salinity is 1.5%)

Table 5 Removal of pollutants during stable operation (salinity is 2%)

It can be seen from Table 2 to Table 5 that under the salinity condition of 0.5% to 2%, the average removal rates of COD, BOD ₅ , NH ₄ ⁺ -N, TN, and TP of this system are 90.4% to 95.6%, respectively. 91.1%～97.1%, 91.8%～97.5%, 90.2%～96.6%, 90.3%～97.8%. As the salinity of the incoming water increases, the overall removal efficiency of various pollutants shows a downward trend, but this system can effectively alleviate the inhibitory effect of salinity, so that their removal rates can still be maintained at more than 90%.

To sum up, the utility model provides a bacterial-charcoal coupling-enhanced saline domestic sewage treatment system with reasonable layout, good treatment effect, low operating cost and low secondary pollution, and is worthy of promotion in the industry.

Those of ordinary skill in the art will realize that the embodiments here are provided to help readers understand the principles of the present invention, and it should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations based on the technical revelations disclosed in the present utility model without departing from the essence of the present utility model. These modifications and combinations are still within the protection scope of the present utility model.

Claims (10)

1. A fungus charcoal coupling enhancement type salt-containing domestic sewage treatment system is characterized in that: comprises a water inlet tank (1), a first reaction tank (3), a first water collecting tank (4), a second reaction tank (6), a second water collecting tank (8), a charcoal adding tank (2), a mud collecting tank (5) and a gas collecting tank (7) which are connected in sequence through pipelines; the carbon adding box (2) is connected with the first reaction tank (3) through a pipeline, the top of the second reaction tank (6) is connected to the gas collecting box (7) through a pipeline, and the bottoms of the first reaction tank (3) and the second reaction tank (6) are connected to the mud collecting tank (5) through pipelines;

the first reaction tank (3) and the second reaction tank (6) are respectively inoculated with aerobic activated sludge and anaerobic granular sludge, the charcoal adding box (2) is filled with biochar, and the biochar can be added into the first reaction tank (3) through a pipeline; an aeration component and a stirring component are also arranged in the first reaction tank (3);

the sewage to be treated enters the first reaction tank (3) from the water inlet tank (1), flows out from the upper part of the first reaction tank (3), enters the second reaction tank (6) from the lower part of the second reaction tank (6) through the first water collecting tank (4), and finally flows out from the upper part of the second reaction tank (6) to enter the second water collecting tank (8).

2. The bacteria-charcoal coupling enhanced type salt-containing domestic sewage treatment system according to claim 1, wherein: the aeration assembly comprises a microporous aeration disc (13) arranged at the bottom of the first reaction tank (3), and the microporous aeration disc (13) is communicated with an aerator (14) outside the first reaction tank (3) through a pipeline.

3. The bacteria-charcoal coupling enhanced type salt-containing domestic sewage treatment system according to claim 1, wherein: the stirring assembly comprises a stirrer (11), and the stirring end of the stirrer (11) is positioned below the liquid surface of the first reaction tank (3).

4. The bacteria-charcoal coupling enhanced type salt-containing domestic sewage treatment system according to claim 1, wherein: a decanter (12) is further arranged in the first reaction tank (3), and the first water collecting tank (4) is communicated with a water outlet of the decanter (12) through a pipeline.

5. The bacteria-charcoal coupling enhanced type salt-containing domestic sewage treatment system according to claim 4, wherein: a drain valve (22) is arranged on a pipeline between the first water collecting tank (4) and the water outlet of the decanter (12).

6. The bacteria-charcoal coupling enhanced type salt-containing domestic sewage treatment system according to claim 1, wherein: a metering pump I (19) and a relay (20) are arranged on a pipeline between the water inlet tank (1) and the reaction tank I (3), and a metering pump II (24) is arranged on a pipeline between the water collecting tank I (4) and the reaction tank II (6); a carbon adding valve (21) is arranged on a pipeline between the carbon adding box (2) and the first reaction tank (3).

7. The bacteria-charcoal coupling enhanced type salt-containing domestic sewage treatment system according to claim 1, wherein: a first mud discharge valve (23) is arranged on a pipeline between the mud collecting tank (5) and a first mud discharge port (10) of the first reaction tank (3); and a second mud discharging valve (25) is arranged on a pipeline between the mud collecting tank (5) and the second reaction tank (6).

8. The bacteria-charcoal coupling enhanced type salt-containing domestic sewage treatment system according to any one of claims 1 to 7, wherein: the charcoal filled in the charcoal adding box is one or more of rape straw charcoal, rice straw charcoal and wheat straw charcoal.

9. The bacteria-charcoal coupling enhanced type salt-containing domestic sewage treatment system according to any one of claims 1 to 7, wherein: the inoculation amount of the aerobic granular sludge in the first reaction tank (3) is 5-50% of the volume of the first reaction tank (3).

10. The bacteria-charcoal coupling enhanced type salt-containing domestic sewage treatment system according to any one of claims 1 to 7, wherein: the inoculation amount of the anaerobic granular sludge in the second reaction tank (6) is 20-70% of the volume of the second reaction tank (6).