CN112897622B - Sewage treatment system and sewage treatment method - Google Patents

Abstract

The invention provides a sewage treatment system and a sewage treatment method, wherein the sewage treatment system comprises a reaction container and a membrane filter assembly, wherein an adsorption separation cavity, an interception cavity, a water inlet, a water outlet and a discharge port are arranged in the reaction container, the water inlet, the adsorption separation cavity, the interception cavity and the water outlet are sequentially communicated, and the discharge port is communicated with the adsorption separation cavity; the membrane filtering component comprises a membrane filtering material with the porosity of more than 90%, the membrane filtering material is arranged in the intercepting cavity, and sewage to be treated entering from the water inlet is treated by an adsorption separation material or a medicament in the adsorption separation cavity, and then the adsorption separation material or the medicament is filtered by the membrane filtering material and flows out from the water outlet. The invention can effectively enrich the adsorption separation material or medicament, improve the adsorption and capture capacity of the adsorption separation material or medicament, improve the sewage treatment efficiency and prolong the service life of the adsorption separation material or medicament.

Description

Sewage treatment system and sewage treatment method

Technical Field

The invention relates to the field of environmental protection, in particular to a sewage treatment system and a sewage treatment method.

Background

Adsorption separation is a water treatment technology which is generally applied at present. Generally, an adsorption separation material captures pollutants in water through electrostatic action, hydrophilic and hydrophobic action, ion exchange action, pi-pi action and the like so as to realize separation and removal and achieve the aim of purifying water. Common adsorptive separation materials include carbon powder, ion exchange resin, coagulant, fly ash, molecular sieve, kaolin, etc. The smaller the size of the adsorption separation material is, the larger the total surface area of the adsorption separation material is, the more the effective functional groups are, and the better the adsorption separation effect is. However, the size is too small, the loss is easy, the flow rate of inflow water needs to be reduced, and the adsorption saturation capacity cannot be fully achieved.

In order to improve the treatment efficiency of the adsorption separation material, achieve the adsorption saturation capacity of the adsorption separation material and prolong the service life of the adsorption separation material, scientific researchers continuously improve the material structure and the functional group characteristics of the adsorption separation material. The application result of the practical wastewater treatment engineering shows that the water quantity is large, the flow rate is high, and the time required by adsorption saturation of the water quantity is difficult to achieve. Therefore, the synchronous increase of the adsorption rate and the adsorption amount becomes a difficulty in industrial application.

The adsorption separation effect is improved by other processes, and the method is an effective way. How to realize 1+1 >. Generally, the processes combined with the adsorption separation process include an activated sludge microorganism process and a filtration process. The adsorption separation material is used as an assistant and can be used for strengthening the activated sludge microbial process and improving the microbial degradation efficiency; or the pollutants which are easy to pollute the filter material are pretreated, and the service life of the filter material is prolonged. However, how to improve the adsorption rate and the adsorption amount of the adsorption separation material by other processes and reduce the usage amount thereof to reduce the waste disposal burden thereof, the realization of the synergistic improvement of the water purification efficiency of the combined process is still a practical difficulty.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a new sewage treatment system and a new sewage treatment method, aiming at the problem that the adsorption rate and the adsorption amount of the adsorption separation material cannot be considered when sewage is treated by the adsorption separation method.

The technical scheme for solving the technical problems is that the invention provides a sewage treatment system, which comprises a reaction container and a membrane filter assembly, wherein an adsorption separation cavity, an interception cavity, a water inlet, a water outlet and a discharge port are arranged in the reaction container, the water inlet, the adsorption separation cavity, the interception cavity and the water outlet are sequentially communicated, and the discharge port is communicated with the adsorption separation cavity;

the membrane filtering component comprises a membrane filtering material with the porosity of more than 90%, the membrane filtering material is arranged in the intercepting cavity, and the adsorption separation material is filtered by the membrane filtering material after the sewage to be treated entering from the water inlet is treated by the adsorption separation material in the adsorption separation cavity and flows out from the water outlet;

the particle size of the adsorption separation material is less than 300 microns, and the adsorption separation material is used for treating sewage to be treated in one or more ways of: electrostatic adsorption, hydrophilic and hydrophobic effect and ion exchange.

Preferably, the size of the membrane filter material in the direction from the adsorption separation cavity to the water outlet is not less than 5mm, and the compression rate of the membrane filter material is not less than 10%;

the membrane filtering component comprises a compression device, and the compression device is used for compressing the membrane filtering material according to the particle size of the adsorption and separation material so as to enable the interception rate of the adsorption and separation material to be not less than 90%.

Preferably, a primary baffle is arranged in the adsorption separation cavity and is arranged in front of the water inlet;

the water inlet is positioned on the vertical inner wall of the reaction vessel, the distance between the upper part of the primary baffle and the inner wall of the reaction vessel where the water inlet is positioned is larger than the distance between the lower part of the primary baffle and the inner wall of the reaction vessel where the water inlet is positioned, and a complete mixing area is formed between the inner wall of the reaction vessel where the water inlet is positioned and the primary baffle; the sewage to be treated flowing in from the water inlet changes the flow direction under the blockage of the primary baffle plate, and is fully mixed with the adsorption separation material in the fully-mixed area.

Preferably, in the reaction vessel, the adsorption separation chamber is separated from the interception chamber by a horizontal partition plate, the interception chamber is located above the horizontal partition plate, and the adsorption separation chamber is located below the horizontal partition plate;

the water outlet is positioned above the membrane filtering material, and the horizontal partition plate is provided with a communication port for communicating the adsorption separation cavity with the interception cavity.

Preferably, a secondary baffle is arranged in the adsorption separation cavity and is arranged in front of the communication port;

the first side of the secondary baffle is connected with the horizontal partition plate, the second side of the secondary baffle inclines downwards and extends out of the vertical projection area of the communication port, an adsorption area is formed between the primary baffle and the secondary baffle, and an accumulation area is formed between the areas of the communication ports of the secondary baffle and the horizontal partition plate; in the adsorption area, the sewage to be treated flowing from the fully mixed area is fully collided and contacted with the adsorption separation material under the blocking of the secondary baffle plate, and then enters the accumulation area.

Preferably, the top of the first-stage baffle is connected with the first side of the second-stage baffle, an included angle between the first-stage baffle and the second-stage baffle is 75-90 degrees, and an included angle between the second-stage baffle and the horizontal partition plate is 30-35 degrees.

Preferably, the included angle between the bottom plate of the adsorption separation cavity and the horizontal plane is more than 20 degrees, and the discharge port is positioned at the bottom of the bottom plate.

Preferably, the sewage treatment system comprises a pipeline mixer, the pipeline mixer comprises a first inlet, a second inlet and an outlet, and the pipeline mixer passes the sewage to be treated through the first inlet, throws the adsorptive separation material through the second inlet, and is connected to the water inlet of the reaction vessel through the outlet.

The invention also provides a sewage treatment method based on the sewage treatment system, which comprises the following steps:

sewage to be treated enters the adsorption separation cavity of the reaction vessel through a water inlet, and pollutants are separated and removed through an adsorption separation material;

and sewage to be treated in the adsorption separation cavity flows into the interception cavity, and flows out of the water outlet after the adsorption separation material is intercepted by the membrane filtering material of the membrane filtering component.

Preferably, the size of the membrane filter material in the direction from the adsorption separation cavity to the water outlet is not less than 5mm, the compressibility of the membrane filter material is not less than 10%, and the membrane filter assembly comprises a compression device; the method further comprises the following steps:

and compressing the membrane filtering material by the compression device to ensure that the interception rate of the adsorption separation material is not less than 90%.

The sewage treatment system and the sewage treatment method have the following beneficial effects: the adsorption and separation material through the micron order is in the adsorption and separation cavity, fully adsorbs the pollutants in the sewage to be treated, and intercepts the adsorption and separation material through the membrane filter material with the porosity of more than 90 percent, so that the adsorption and separation material can be effectively enriched, the adsorption and capture capacity of the adsorption and separation material is improved, the sewage treatment efficiency is improved, and the service life is prolonged.

Drawings

FIG. 1 is a schematic view of a wastewater treatment system provided by an embodiment of the invention;

FIG. 2 is a schematic view of a sewage treatment system for sewage treatment according to an embodiment of the present invention;

FIG. 3 is a graph comparing the amount of polyaluminium chloride used in a sewage treatment system according to an embodiment of the present invention with that used in a conventional sewage treatment system;

FIG. 4 is a graph comparing the total phosphorus treatment efficiency of a sewage treatment system according to an embodiment of the present invention with that of a conventional sewage treatment system using polyaluminum chloride;

FIG. 5 is a graph comparing the backwash frequency of a sewage treatment system according to an embodiment of the present invention with that of a conventional sewage treatment system using powdered activated carbon;

FIG. 6 is a graph comparing COD treatment efficiency of the sewage treatment system provided by the embodiment of the present invention and that of the conventional sewage treatment system using powdered activated carbon.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1-2 are schematic structural views of a sewage treatment system according to an embodiment of the present invention, which can be used for sewage treatment, especially domestic sewage treatment. The sewage treatment system of the present embodiment includes a reaction vessel 10 and a membrane filter assembly, wherein the reaction vessel 10 is a relatively closed vessel for providing a space for sewage treatment.

In this embodiment, an adsorption separation chamber, an intercepting chamber 12, a water inlet 114, a water outlet 115, and a discharge port 116 are disposed in the reaction vessel 10, the water inlet 114, the adsorption separation chamber, the intercepting chamber 12, and the water outlet 115 are sequentially communicated in a flow direction of sewage, and the discharge port 116 is communicated with the adsorption separation chamber. The membrane filter assembly comprises a membrane filter material 21 arranged in the intercepting chamber 12, and the membrane filter has a porosity of more than 90%.

The sewage to be treated enters the adsorption separation chamber from the water inlet 114, and in the adsorption separation chamber, the adsorption separation material 30 adsorbs and separates pollutants (such as phosphorus-containing pollutants, COD, etc.) in the sewage to be treated. The pollutants in the sewage to be treated comprise COD and BOD ₅ SS, turbidity, chromaticity, ammonia nitrogen, total phosphorus, faecal coliform number and the like.

Specifically, the sewage treatment system includes a pipe mixer 23 including a first inlet 231, a second inlet 232, and an outlet, and the pipe mixer 23 introduces the sewage to be treated through the first inlet 231, dispenses the adsorptive separation material 30 through the second inlet 232, and is connected to the water inlet 114 of the reaction vessel 10 through the outlet. In the initial stage of sewage treatment, the adsorptive separation material 30 may be fed through the second inlet 232 while the wastewater to be treated is fed in, so that the adsorptive separation material 30 is carried by the sewage to be treated into the reaction vessel.

In this embodiment, the particle size of the adsorptive separation material 30 is less than 300 μm, and the adsorptive separation material 30 treats the wastewater by one or more of the following methods: electrostatic adsorption, hydrophilic-hydrophobic interaction, ion exchange, for example, the adsorptive separation material 30 may be one or more of the following coagulants, carbon powder, ion exchange resin, and the like. The sewage after the adsorption separation treatment enters the interception cavity 12, and the adsorption separation material 30 is filtered by the membrane filter material 21 and then flows out from the water outlet 115.

Above-mentioned sewage treatment system, adsorption and separation material 30 through the micron order is in the adsorption and separation intracavity, and the pollutant in the sewage of treating fully adsorbs to the membrane filter material through the porosity that has more than 90% intercepts adsorption and separation material 30, avoids adsorption and separation material 30 to run off, can effectively enrich adsorption and separation material 30, promotes adsorption and capture ability of adsorption and separation material 30, improves its sewage treatment efficiency, prolongs its life.

In addition, in the adsorption separation cavity of the reaction container, the filling ratio of the adsorption separation material 30, namely the volume ratio of the adsorption separation material in the treatment area is 40% -80%. Under the synergistic condition of the membrane filtration material 21, the water inflow retention time can be reduced by increasing the water inflow, the turbulence degree of the adsorption separation material 30 and the possibility of sewage collision are increased, and the service life of the adsorption separation material 30 is prolonged by 2 to 60 times on the premise of ensuring the sewage treatment effect.

In an embodiment of the present invention, the dimension of the membrane filter material 21 in the direction from the adsorption separation chamber to the water outlet 115 is not less than 5mm, and the compressibility of the membrane filter material 21 is not less than 10%, specifically, the membrane filter material includes sponge, glass wool, non-woven fabric, and the like. And, in order to improve the interception rate of the adsorption separation material 30, the membrane filter assembly further comprises a compressing device 22, wherein the compressing device 22 is used for compressing the membrane filter material 21 according to the particle size of the adsorption separation material 30, so that the interception rate of the adsorption separation material 30 is not less than 90%.

For example, when the particle size of the adsorption separation material 30 is relatively small (in the order of micrometers), the compression amount of the membrane filtration material may be increased by the compression device 22; when the particle size of the adsorption separation material 30 is relatively large (also in the order of micrometers), the compression amount of the membrane filtration material can be reduced by the compression device 22; thereby, while ensuring the circulation speed of the water treated by the adsorption separation material 30, intercepting the adsorption separation material 30 to the maximum extent, and saving the use amount of the adsorption separation material 30.

In one embodiment of the invention, in the reaction vessel 10, the adsorption separation chamber is separated from the interception chamber 12 by a horizontal partition 15, the interception chamber 12 is located above the horizontal partition 15, the adsorption separation chamber is located below the horizontal partition 15, and the water outlet 115 is located above the membrane filtration material 21. The horizontal partition 15 has a communication port for communicating the adsorption separation chamber with the catch chamber 12. With the above structure, the residence time of the sewage to be treated in the reaction vessel 10 is easily controlled.

The primary baffle 13 is arranged in the adsorption separation cavity, the primary baffle 13 is arranged in front of the water inlet 114, correspondingly, the water inlet 114 is positioned on the vertical inner wall of the reaction vessel 10, the distance between the upper part of the primary baffle 13 and the inner wall of the reaction vessel 10 where the water inlet 114 is positioned is larger than the distance between the lower part of the primary baffle 13 and the inner wall of the reaction vessel 10 where the water inlet 114 is positioned, and a complete mixing area 111 is formed between the inner wall of the reaction vessel 10 where the water inlet 114 is positioned and the primary baffle 13. Thus, the sewage to be treated flowing in from the water inlet 114 is changed in flow direction by the first-stage baffle 13 and is sufficiently mixed with the adsorptive separation material 30 in the complete mixing zone 111.

In addition, a secondary baffle 14 can be arranged in the adsorption separation cavity, and the secondary baffle 14 is arranged in front of a communication port of the horizontal partition plate 15; and, the first side of the secondary baffle 14 is connected to the horizontal partition 15, and the second side (i.e., the side away from the first side) of the secondary baffle 14 is inclined downward and extends outside the vertical projection area of the communication port, and an adsorption area 112 is formed between the primary baffle 13 and the secondary baffle 14, and an accumulation area 113 is formed between the secondary baffle 14 and the area of the communication port of the horizontal partition 15. In the adsorption zone, the sewage to be treated flowing from the fully mixed zone 111 is fully collided and contacted with the adsorption separation material 30 under the blocking of the secondary baffle 14, and then enters the accumulation zone 113 for further adsorption separation.

Particularly, the top of the primary baffle 13 is connected with the first side of the secondary baffle 14, the included angle between the primary baffle 13 and the secondary baffle 14 is 75-90 degrees, and the included angle between the secondary baffle 14 and the horizontal partition 15 is 30-35 degrees. Thus, under the coordination of the membrane filter material 21, the inflow water flow of the water inlet 114 can be increased by 1 to 15 times to reduce the inflow water retention time, so that the turbulence degree and the possibility of collision and contact of the adsorption separation material 30 with sewage in the full mixing area 111, the adsorption area 112 and the accumulation area 113 are improved, and meanwhile, the adsorption separation material 30 is beneficial to naturally settle to the adsorption area 112 in the accumulation area 113, and the amount of the adsorption separation material reaching the interception area 12 is reduced.

Multiple experiments prove that the removal rate of a certain sewage treatment index can be improved by 50 to 6000 percent under the same dosage of the adsorption separation material 30, wherein the sewage treatment index comprises COD and BOD ₅ SS, turbidity, chromaticity, ammonia nitrogen, total phosphorus, faecal coliform number and the like.

With reference to fig. 5 and 6, in the above sewage treatment system, when powdered activated carbon is used as the adsorption separation material, the total usage time of the sewage treatment system is increased by 2 to 60 times under the same backwashing times or the backwashing times are decreased by 2 to 60 times under the same total usage time before the adsorption separation material is replaced. Meanwhile, the removal rate of COD in the sewage to be treated can be improved.

In particular, the bottom plate 113 of the adsorption separation chamber of the reaction vessel 10 is at an angle of more than 20 ° to the horizontal, and the discharge port 116 is located at the bottom of the bottom plate 116. Through the above structure, the adsorption and separation material 30 convenient for fully adsorbing pollutants sinks to the discharge port 116 under the action of self gravity, and the adsorption and separation material 30 which does not fully adsorb pollutants then follows the upward convection of water flow, and fully contacts with the wastewater to be treated, thereby improving the efficiency of adsorbing pollutants of the adsorption and separation material 30.

The invention also provides a sewage treatment method based on the sewage treatment system, which comprises the following steps:

in the initial stage, the sewage to be treated mixed with the adsorption separation material 30 is introduced into the reaction vessel 10 through the water inlet 114 at a first inflow rate;

after the preset time, independently introducing the sewage to be treated into the reaction container through the water inlet at a second inflow speed, wherein the second inflow speed is greater than the first inflow speed. The preset time can be adjusted according to the type of the sewage to be treated.

In the above sewage treatment method, the method may further comprise: the membrane filtering material is compressed by a compression device, so that the interception rate of the adsorption separation material is not less than 90%.

Example 1

The sewage treatment system shown in figure 1 is used, wherein polyaluminium chloride is selected as an adsorption separation material, and hydrophilic sponge with pore canal size of 200 micrometers is selected as a membrane filtering material. The polyaluminium chloride is uniformly mixed with the sewage inlet water to be treated (the inlet flow rate is 10 m/h) according to the proportion of 35mg/L by a pipeline mixer and enters a full mixing area 111 of the reaction vessel 10; after the rapid mixing contact is carried out in the complete mixing zone 111, the wastewater further flows through the adsorption zone 112 to fully contact with pollutants in the water body, and is adsorbed and trapped to form polyaluminium chloride alum floc; the alumen ustum enters the accumulation zone 113 along with the water flow, and is completely intercepted by the membrane filtering material 21, and is gradually accumulated to form a polyaluminium chloride accumulation layer.

After the operation is carried out for 2 weeks, the inflow velocity of the sewage to be treated is increased to 25m/h, the addition of the polyaluminium chloride is stopped, the volume ratio of the polyaluminium chloride in the adsorption separation area of the reaction vessel 10 is 65 percent, the total phosphorus can be still efficiently removed, the removal rate can be increased to 15 percent, and the continuous and effective operation can be carried out for 13 weeks additionally.

Compared with the traditional sewage treatment system adopting polyaluminium chloride to remove the total phosphorus, the polyaluminium chloride accumulation layer has the function of a high-efficiency filter column, can realize multi-layer adsorption, increases the utilization rate of the polyaluminium chloride, saves the using amount of the polyaluminium chloride by 16 times, and improves the removal rate of the total phosphorus.

Example 2

Similarly, the sewage treatment system shown in fig. 1 is adopted, the adsorption separation material 30 is 200 microns of powdered activated carbon, and the membrane filter material 21 is hydrophilic sponge with pore size of 50 microns. After the powdered activated carbon is filled according to the volume ratio of 75%, the sewage inlet water to be treated (the inlet flow rate is 3 m/h) is introduced into the reaction vessel 10. The sewage flows through the fully mixing area 111 to be rapidly mixed and contacted with the powdered activated carbon; the powdered activated carbon further turbulently adsorbs and traps pollutants in the water body in the adsorption area 112 under the action of water flow; finally, as the water flow enters the accumulation area 113, the water flow is totally intercepted by the membrane filtering material 21 and gradually accumulated to form a powder activated carbon accumulation layer.

After 14 weeks of operation, the regeneration was performed 5 times with hot water backwash, as shown in FIG. 5. Compared with the traditional sewage treatment system adopting powdered activated carbon, the backwashing frequency of the powdered activated carbon is greatly reduced to only 8%, and meanwhile, the removal efficiency is obviously improved (by about 3 times), as shown in fig. 6.

In this embodiment 2, the membrane filter material can effectively intercept powdered activated carbon, realizes the subregion under the assistance of one-level baffle 13 and second grade baffle 14, increases powdered activated carbon's contact adsorption chance, forms high-efficient fluidized bed at the adsorption zone, forms the accumulation layer in the accumulation district, plays the filterable effect of high-efficient adsorption, realizes activated carbon multilayer adsorption, increases its utilization efficiency, improves a water quality of water greatly.

Example 3

Similarly, the sewage treatment system shown in fig. 1 is adopted, the adsorption separation material 30 is aerobic bacteria of 300 microns, and the membrane filter material 21 is hydrophilic sponge with pore canal size of 50 microns. After the aerobic bacteria are filled according to the volume ratio of 75 percent, the sewage inlet water to be treated (the inlet flow rate is 3m/h, and the oxygen concentration is 2 mg/L) is introduced into the reaction vessel 10. The sewage flows through the fully mixing zone 111 to be rapidly mixed and contacted with aerobic bacteria; the aerobic bacteria further turbulently adsorb and capture pollutants in the water body in the adsorption region 112 under the action of the water flow; finally, as the water flow enters the accumulation area 113, the water flow is completely intercepted by the membrane filter material 21 and gradually accumulated to form an aerobic bacteria accumulation layer.

After the addition of the aerobic bacteria is stopped, the sewage is continuously fed for 3 days, then the water feeding is stopped for 2 days, and the operation is carried out for 10 times according to the mode of feeding water for 3 days and stopping water for 2 days, so that the aerobic bacteria are forced to secrete a large amount of extracellular polymeric substances to form a bacterial colony, and the capability of adsorbing pollutants in the sewage is improved. The sewage is restarted to enter water, and the aerobic bacteria continuously adsorb and degrade pollutants in the sewage, so that the aim of purifying the water body is fulfilled. Compared with the traditional system for sewage treatment by adopting aerobic bacteria, the hydraulic retention time of the aerobic bacteria mass intercepted by the membrane filtration can be shortened by 2 times, meanwhile, the total nitrogen removal efficiency is obviously improved (by about 60 percent), and the sludge age is improved by 5 times.

In the embodiment 3, the membrane filter material can effectively intercept aerobic bacteria, greatly improve the sludge concentration of the membrane filter material, improve the adsorption contact chance of the aerobic bacteria, and synchronously reduce the hydraulic retention time; the zoning is realized under the assistance of the first-stage baffle 13 and the second-stage baffle 14, so that the fungus mass is promoted to generate the diversity of shapes and sizes, different degradation capacities are realized, and particularly, granulated fungus masses (the size of the fungus mass is 1-3 mm) are formed in the adsorption area 113, so that the total nitrogen removal efficiency is improved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (6)

1. A sewage treatment system is characterized by comprising a reaction container and a membrane filter assembly, wherein an adsorption separation cavity, an interception cavity, a water inlet, a water outlet and a discharge port are arranged in the reaction container, the water inlet, the adsorption separation cavity, the interception cavity and the water outlet are sequentially communicated, and the discharge port is communicated with the adsorption separation cavity;

the membrane filtering component comprises a membrane filtering material with the porosity of more than 90%, the membrane filtering material is arranged in the intercepting cavity, and the adsorption separation material is filtered by the membrane filtering material after the sewage to be treated entering from the water inlet is treated by the adsorption separation material in the adsorption separation cavity and flows out from the water outlet;

the particle size of the adsorption separation material is less than 300 microns, and the adsorption separation material is used for treating sewage to be treated in one or more ways of: electrostatic adsorption, hydrophilic and hydrophobic effects and ion exchange; in the adsorption separation cavity, the filling ratio of the adsorption separation material is 40% -80%;

the size of the membrane filter material in the direction from the adsorption separation cavity to the water outlet is not less than 5mm, and the compression rate of the membrane filter material is not less than 10%;

the membrane filtering component comprises a compression device, and the compression device is used for compressing the membrane filtering material according to the particle size of the adsorption separation material so as to enable the interception rate of the adsorption separation material to be not less than 90%;

a primary baffle is arranged in the adsorption separation cavity and is arranged in front of the water inlet;

the water inlet is positioned on the vertical inner wall of the reaction vessel, the distance between the upper part of the primary baffle and the inner wall of the reaction vessel where the water inlet is positioned is larger than the distance between the lower part of the primary baffle and the inner wall of the reaction vessel where the water inlet is positioned, and a complete mixing area is formed between the inner wall of the reaction vessel where the water inlet is positioned and the primary baffle; the sewage to be treated flowing in from the water inlet changes the flow direction under the blockage of the primary baffle plate, and is fully mixed with the adsorption separation material in the fully mixing area;

in the reaction container, the adsorption separation cavity and the interception cavity are separated by a horizontal partition plate, the interception cavity is positioned above the horizontal partition plate, and the adsorption separation cavity is positioned below the horizontal partition plate;

the water outlet is positioned above the membrane filtering material, and the horizontal partition plate is provided with a communication port for communicating the adsorption separation cavity with the interception cavity;

a secondary baffle is arranged in the adsorption separation cavity and is arranged in front of the communication port;

the first side of the secondary baffle is connected with the horizontal partition plate, the second side of the secondary baffle inclines downwards and extends out of the vertical projection area of the communication port, an adsorption area is formed between the primary baffle and the secondary baffle, and an accumulation area is formed between the areas of the communication ports of the secondary baffle and the horizontal partition plate; in the adsorption area, the sewage to be treated flowing from the fully mixed area is fully collided and contacted with the adsorption separation material under the blocking of the secondary baffle plate, and then enters the accumulation area.

2. The wastewater treatment system according to claim 1, wherein the top of the primary baffle is connected to the first side of the secondary baffle, and the angle between the primary baffle and the secondary baffle is 75-90 °, and the angle between the secondary baffle and the horizontal partition is 30-35 °.

3. The wastewater treatment system according to claim 1, wherein the bottom plate of the adsorption separation chamber has an angle greater than 20 ° with respect to the horizontal plane, and the discharge port is located at the bottom of the bottom plate.

4. The wastewater treatment system of claim 1, comprising a pipe mixer, wherein the pipe mixer comprises a first inlet, a second inlet, and an outlet, and wherein the pipe mixer passes wastewater to be treated through the first inlet, dispenses the adsorptive separation material through the second inlet, and is connected to the water inlet of the reaction vessel through the outlet.

5. A sewage treatment method based on the sewage treatment system according to any one of claims 1 to 4, comprising the steps of:

introducing the sewage to be treated mixed with the adsorption separation material into a reaction container through a water inlet at a first water inflow speed;

after the preset time, the sewage to be treated is separately led into the reaction container through the water inlet at a second water inflow speed, and the second water inflow speed is greater than the first water inflow speed.

6. The wastewater treatment method according to claim 5, further comprising:

and compressing the membrane filtering material by the compression device to ensure that the interception rate of the adsorption separation material is not less than 90%.

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