Layered adsorption-constructed wetland cooperative tail water treatment device and method

Abstract

The invention discloses a device and a method for cooperatively treating tail water through layered adsorption-artificial wetland. The device comprises a layered selective adsorption treatment unit, a pyrolysis treatment unit and an enhanced artificial wetland unit, the treatment method comprises the following steps: simulated wastewater enters the layered selective adsorption treatment unit to remove antibiotics and reduce inhibition on denitrifying bacteria, and effluent enters the enhanced artificial wetland unit; the adsorption layer enters the pyrolysis treatment unit through an inclined diversion trench connected in parallel on one side, effluent after adsorption enters the wetland unit, halotolerant bacteria in the wetland play a denitrification function, and the biochar layer provides a carbon source to realize effective removal of nitrogen; according to the invention, materials with selective adsorption performance are arranged in a layered manner, so that different types of antibiotics are adsorbed in sequence; a reinforced constructed wetland is adopted for effluent, and the load of nitrate nitrogen and other nutritive salts is further reduced; the structure of microorganisms in the wetland is stable, and the denitrification function of halotolerant bacteria is combined, so that the interference of salinity on the denitrification of the wetland is enhanced, and the denitrification efficiency is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, in particular to a device and method for collaboratively treating tail water using layered adsorption and artificial wetlands. Background Art

[0002] Water resources are scarce in Northwest China, where evaporation is dozens of times greater than rainfall, creating a significant water shortage. To alleviate this, ecological water replenishment using recycled water has become an important approach. Furthermore, the replenished water can be directly used downstream for irrigation of surrounding farmland.

[0003] However, the tail water of urban sewage treatment plants has low carbon content and nitrate nitrogen ( ) concentrations, with a carbon-nitrogen ratio (C / N) typically below 3.5. If this water is discharged without effective treatment, it will lead to eutrophication of the receiving waters and damage the aquatic ecosystem.

[0004] Although ecological measures are currently in place to remove nitrate nitrogen, in the severely salinized areas of Northwest China, antibiotics and salinity can exert selective pressure on denitrifying bacteria, inhibiting the removal of nitrate nitrogen and further leading to eutrophication in rivers, a problem that is not currently considered in current technical solutions. Furthermore, with the development of urbanization, in arid and semi-arid areas with limited economic levels and water resources, recycled water sources primarily focus on conventional nitrogen and phosphorus removal, while their ability to remove salinity and antibiotics is relatively poor. During the biological removal of nitrate nitrogen, antibiotics and salinity can, to varying degrees, affect the recycling and transformation of nitrogen and the growth and enrichment of denitrifying microorganisms, interfering with the wetland's absorption of nutrients and the action of microorganisms, directly affecting the nitrogen treatment efficiency in the wetland and becoming a major hidden danger to the stable and improved water quality. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention discloses a device and method for collaborative treatment of tailwater by layered adsorption and artificial wetland, so as to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a device for synergistically treating tailwater by layered adsorption and artificial wetland, comprising a layered selective adsorption treatment unit, a pyrolysis treatment unit and an enhanced artificial wetland unit;

[0007] The simulated wastewater enters the layered selective adsorption treatment unit through the first peristaltic pump, and antibiotics are removed respectively through the layered selective adsorption treatment unit comprising a cationic adsorption layer, a hydrophobic adsorption layer and a polar adsorption layer. The adsorption material is transported to the pyrolysis treatment unit on one side. The effluent treated by the layered selective adsorption treatment unit enters the enhanced artificial wetland unit through the second peristaltic pump, and passes through the enhanced artificial wetland unit comprising a gravel support layer, a biochar layer and a volcanic rock layer inoculated with salt-tolerant bacteria, thereby reducing the salinity and the inhibitory effect of antibiotics on denitrification microorganisms.

[0008] Preferably, the three layers of adsorption layers with different functions arranged inside the layered selective adsorption treatment unit are, from top to bottom, a cationic adsorption layer, a hydrophobic adsorption layer and a polar adsorption layer. When the adsorption layer enriches the antibiotics to a preset concentration threshold, the adsorption material saturated with adsorption on the adsorption layer enters the pyrolysis treatment unit through an inclined guide groove arranged in parallel on one side, decomposes the antibiotics by pyrolysis and regenerates them into stable biochar. The enriched antibiotics are decomposed by the pyrolysis treatment unit to generate stable biochar.

[0009] Preferably, a filter screen is provided at the bottom of each of the three adsorption layers, wherein each of the three adsorption layers is 15 cm high and 18 cm apart. The cationic adsorption layer is filled with sodium bentonite with a particle size of 0.5–2 mm, which absorbs cationic antibiotics, such as tetracycline antibiotics, through cation exchange through high specific surface area and negatively charged layered structure; the hydrophobic adsorption layer is filled with corn cob iron-modified biochar with a particle size of 3–5 mm, which absorbs cationic antibiotics, such as tetracycline antibiotics, through iron ( 、 ) provides coordination and complexation to enhance affinity for neutral antibiotics, such as benzene amides, quinolones and macrolides; the polar adsorption layer is filled with a composite of amino-treated biochar and modified ceramsite, with a particle size of 1-4 mm, which removes highly polar, water-soluble and small-structured antibiotics, such as sulfonamides and β-lactam antibiotics, through the mechanisms of hydrogen bonding, polar-polar interaction and electrostatic adsorption.

[0010] Preferably, the three adsorption layers are all connected to a sensor unit, and indicators are transmitted through a provided transmission device, wherein the indicators include ultraviolet absorption, total organic carbon, conductivity and pH.

[0011] Preferably, the inclined guide grooves are each provided with an automatic valve, and the adsorption saturation degree of the antibiotics in the adsorption layer is determined according to the indicators collected by the sensor unit, and the opening and closing of the automatic valve is regulated by a computer.

[0012] Preferably, the enhanced artificial wetland unit comprises, from bottom to top, a gravel support layer, a biochar layer, and a volcanic rock layer;

[0013] The volcanic rock layer is used to plant salt-tolerant reeds, whose roots extend to the volcanic rock layer; a variety of salt-tolerant bacteria are inoculated in the volcanic rock layer; the gravel support layer is filled with gravel with an average particle size of 3-5 cm and a height of 8 cm; the biochar layer is composed of a mixture of gravel and biochar, which is mainly produced by pyrolysis of reeds to form particles with a size of 2-8 mm and a height of 5 cm, mainly providing a further carbon source for nitrate nitrogen reduction; the volcanic rock layer is modified from volcanic rock with an average particle size of 2-5 cm and a height of 18 cm; the planting density of salt-tolerant reeds on the surface of the volcanic rock layer is 30 plants / m 2 .

[0014] Preferably, the pyrolysis treatment unit is provided with a temperature detection module, and the temperature of the pyrolysis treatment unit is monitored by the temperature detection module.

[0015] The present invention also provides a method for collaboratively treating tail water using layered adsorption and artificial wetlands, comprising the following steps:

[0016] S1. Strengthen the cultivation and start-up of the constructed wetland unit. All plants and substrates were cultured with simulated wastewater without antibiotics before the experiment, and salt-tolerant bacteria were inoculated to activate microbial activity in the constructed wetland. The device was then officially put into operation to treat wastewater.

[0017] S2: The simulated wastewater enters the layered selective adsorption treatment unit, where the hydraulic retention time is set. Different types of antibiotics are adsorbed in the three adsorption layers. The sensor unit is used to preliminarily determine whether the adsorbent is saturated. The saturation index alarm upper limit is set to perform a linkage judgment, triggering the automatic valve to thermally decompose the adsorbent.

[0018] S3, the effluent from the layered selective adsorption treatment unit is controlled by the second peristaltic pump and enters the enhanced artificial wetland unit, where the hydraulic retention time is set;

[0019] S4. Reactions occurring in wetland volcanic rock formations include:

[0020]

[0021] That is, in the aerobic area, that is, near the roots of plants, ammonia nitrogen is converted into nitrate nitrogen under nitrification, and the dissolved oxygen concentration is greater than 2 mg / L;

[0022] ;

[0023] That is, in the anoxic area, that is, away from the root position, nitrate nitrogen undergoes denitrification with biochar or organic carbon and is converted into nitrogen gas;

[0024] The salt-tolerant bacteria inoculated are beneficial to the adaptive growth of the bacterial community and better adapt to saline wastewater. On the other hand, the salt-tolerant bacteria inoculated also have denitrification function, which promotes the denitrification function of the wetland.

[0025] The biochar layer provides a carbon source for the denitrifying bacteria, ensuring an effective denitrification process;

[0026] Ultimately, effective removal of nitrogen from wastewater is achieved.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention achieves efficient removal of pollutants. Through layered selective adsorption treatment units, targeted adsorption materials are set according to the physical and chemical properties of different antibiotics, such as polarity, molecular structure, charge state and distribution coefficient. This can effectively remove antibiotics from tail water and significantly reduce their interference with subsequent treatment units. At the same time, the denitrification function of the artificial wetland unit combined with salt-tolerant bacteria is strengthened to effectively reduce the load of nutrient salts such as nitrate nitrogen, further improving the denitrification efficiency under saline conditions. This collaborative treatment method not only optimizes the pollutant removal effect, but also cooperates with the real-time monitoring device to accurately control the saturation level of the adsorbent, prevent secondary release, and ensure the stable operation of the entire treatment process.

[0029] 2. The present invention improves the operating efficiency and maintainability of the device. It adopts a modular design, making the selection and replacement of adsorption materials more flexible and efficient. Through graded adsorption with bentonite, iron biochar, amino carbon, etc., different types of antibiotics can be removed in a targeted manner. At the same time, automated monitoring can accurately determine the degree of adsorption saturation, enabling timely replacement of adsorbents to avoid degradation of device performance. In addition, the device as a whole does not rely on electricity or light, has a simple structure, is easy to deploy and maintain, reduces operating costs and operational difficulty, and is suitable for application under different environmental conditions.

[0030] 3. This invention inoculates salt-tolerant bacteria within the enhanced artificial wetland unit, effectively alleviating the inhibitory effects of salinity on denitrifying bacteria and improving the adaptability and denitrification capacity of the wetland unit in high-salt environments. Simultaneously, the layered selective adsorption treatment unit intercepts antibiotics before they enter the wetland, further protecting the stability of the microbial structure within the wetland. This design not only enhances the ecological adaptability of the wetland unit but also improves overall sustainability through resource recycling, such as the pyrolysis of adsorbents to produce biochar, in line with the development of eco-friendly wastewater treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0032] In the attached figure:

[0033] Figure 1 Schematic diagram of the structure of the device for synergistic treatment of tail water by layered adsorption and artificial wetland according to the present invention;

[0034] Numbers in the figure: 1. Layered selective adsorption treatment unit; 2. Pyrolysis treatment unit; 3. Enhanced artificial wetland unit; 4. First peristaltic pump; 5. Cationic adsorption layer; 6. Hydrophobic adsorption layer; 7. Polar adsorption layer; 8. Filter screen; 9. Sensor unit; 10. Automatic valve; 11. Inclined guide trough; 12. Transmission device; 13. Computer; 14. Second peristaltic pump; 15. Gravel support layer; 16. Biochar layer; 17. Salt-tolerant bacteria; 18. Volcanic rock layer; 19. Salt-tolerant plants; 20. Temperature detection module. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0036] like Figure 1 As shown, the present invention provides a device for synergistically treating tail water by layered adsorption and artificial wetland, comprising a layered selective adsorption treatment unit 1, a pyrolysis treatment unit 2 and an enhanced artificial wetland unit 3;

[0037] The simulated wastewater enters the layered selective adsorption treatment unit 1 through the first peristaltic pump 4, and the effluent enters the enhanced artificial wetland unit 3 through the second peristaltic pump 14; the adsorption layer enters the pyrolysis treatment unit 2 through the inclined guide trough 11 arranged in parallel on one side, and an automatic valve 10 is provided on the inclined guide trough 11, and the switch of the automatic valve 10 is controlled by the computer 13. A temperature detection module 20 is provided in the pyrolysis treatment unit 2, and the temperature of the pyrolysis treatment unit 2 is monitored by the temperature detection module 20.

[0038] Specifically, the layered selective adsorption treatment unit 1 is equipped with three adsorption layers with different functions according to the complex characteristics of the tail water antibiotics, so as to effectively adsorb different types of antibiotics. The three adsorption layers are connected to a sensor unit 9, and indicators are transmitted through a transmission device 12. The indicators include ultraviolet absorption, total organic carbon, conductivity and pH. The saturation degree of antibiotic adsorption in the adsorption layer is determined according to the indicators collected by the sensor unit 9. Even if the treatment effect of the antibiotics cannot be obtained in real time, the saturation degree of the adsorbent can be evaluated by indicators such as ultraviolet absorption, total organic carbon, conductivity, and pH, and the parallel switch of the automatic valve 10 is automatically set to ensure the effective adsorption of the adsorbent. The layered selective adsorption treatment unit 1 is composed of a cationic adsorption layer 5, a hydrophobic adsorption layer 6 and a polar adsorption layer 7 from top to bottom. When the adsorption layer is enriched with antibiotics to a preset concentration threshold, the adsorption material is transported to the pyrolysis treatment unit 2 on one side through the inclined guide trough 11. The pyrolysis is carried out at 300°C for 2 hours by the pyrolysis treatment unit 2 to decompose the enriched antibiotics and generate stable biochar. A filter screen 8 is set at the bottom of each of the three adsorption layers. Each of the three adsorption layers is 15 cm high and 18 cm apart. The cationic adsorption layer 5 is filled with sodium bentonite with a particle size of 0.5-2 mm. It has a high specific surface area and a negatively charged layered structure, and adsorbs cationic antibiotics such as tetracycline antibiotics through cation exchange. The hydrophobic adsorption layer 6 is filled with corn cob iron-modified biochar with a particle size of 3-5 mm. 、 ) provides coordination and complexation to enhance affinity for neutral antibiotics, such as benzene amides, quinolones and macrolides; the polar adsorption layer 7 is filled with a composite of amino-treated biochar and modified ceramsite with a particle size of 1-4 mm, which removes highly polar, water-soluble and small-structured antibiotics, such as sulfonamides and β-lactam antibiotics, through the mechanisms of hydrogen bonding, polar-polar interaction and electrostatic adsorption; the adsorption material materials of each layer are easy to obtain and can be repeatedly recycled by thermal decomposition.

[0039] Specifically, the enhanced artificial wetland unit 3 includes a gravel support layer 15, a biochar layer 16 and a volcanic rock layer 18 from bottom to top; the surface of the volcanic rock layer 18 is used to plant salt-tolerant plants 19, reeds, and the volcanic rock layer 18 is inoculated with a variety of salt-tolerant bacteria 17; the gravel support layer 15 is filled with gravel with an average particle size of 3 to 5 cm and a height of 8 cm; the biochar layer 16 includes gravel with an average particle size of 3 to 5 cm and a mixture of biochar, and the biochar is mainly pyrolyzed from reeds to form a particle size of 2-8 mm and a height of 5 cm, which mainly provides a carbon source for nitrate nitrogen reduction; the volcanic rock layer 18 is modified from volcanic rocks with an average particle size of 2-5 cm and a height of 18 cm; the planting density of salt-tolerant plants 19, reeds, on the surface of the volcanic rock layer 18 is 30 plants / m 2The constructed wetland matrix is ​​a biochar-sand mixture. Biochar-modified wetlands can effectively enhance the reduction and removal of nitrate nitrogen. Biochar provides a habitat and nutrients for microbial growth, and its chemical properties are stable, making it less likely to cause secondary water pollution.

[0040] The present invention also provides a method for collaboratively treating tail water using layered adsorption and artificial wetlands, comprising the following steps:

[0041] S1. Intensive cultivation and startup of constructed wetland unit 3: All plants and substrates were cultured with simulated wastewater without antibiotics for 30 days before the experiment and inoculated with 17 salt-tolerant bacteria (Halomonas denitrificans, Paracoccus halophilus, and Desulfovibrio halophilus) to initiate microbial activity in the constructed wetland. The device was then officially put into operation to treat wastewater.

[0042] S2. The simulated wastewater enters the layered selective adsorption treatment unit 1, and the hydraulic retention time is set to 2-4 days. Different types of antibiotics are adsorbed under the action of three adsorption layers. The sensor unit 9 is used to collect data indicators, including:

[0043] UV-Vis (254 nm) sensor: C / C0 ≥ 0.85, where C represents the absorbance after adsorption and C0 represents the initial absorbance before adsorption. When the ratio of the absorbance after adsorption to the initial absorbance is greater than or equal to 0.85, it indicates that the adsorption effect of the adsorbent on organic matter in water is weakened and the adsorption saturation level is high.

[0044] TOC (total organic carbon) sensor: C / C0 ≥ 0.8–0.90, where C represents the TOC concentration after adsorption treatment and C0 represents the initial TOC concentration before adsorption treatment. When the ratio of the TOC concentration after adsorption treatment to the initial concentration is greater than or equal to 0.8 to 0.90, it indicates that the adsorbent's adsorption capacity for organic matter has reached a certain level and is close to saturation;

[0045] pH sensor: pH change of inlet and outlet water ≥ ±0.3;

[0046] Conductivity EC sensor: Inlet and outlet water difference ≥ 20-30 μS / cm;

[0047] The above data indicators are used as a preliminary judgment on the saturation of the adsorbent; finally, through linkage judgment, the saturation index SI ≥ 0.85 is set as the alarm upper limit, the automatic valve 10 is triggered, and the adsorbent is subjected to thermal decomposition treatment, wherein the formula used is as follows:

[0048]

[0049] Among them, UV 出 / UV 进 It represents the ratio of the UV absorbance after adsorption to the UV absorbance before adsorption, TOC 出 / TOC 进 It represents the ratio of the total organic carbon concentration after adsorption treatment to the total organic carbon concentration before adsorption treatment. Indicates the pH value changes of inlet and outlet water; Indicates the conductivity difference between inlet and outlet water;

[0050] S3, the effluent from the layered selective adsorption treatment unit 1 is controlled by the second peristaltic pump 14 and enters the enhanced artificial wetland unit 3, where the hydraulic retention time is set to 8-12 hours;

[0051] S4. Reactions occurring in the wetland volcanic rock layer 18 include:

[0052]

[0053] In the aerobic zone, that is, near the roots of plants, ammonia nitrogen is converted into nitrate nitrogen under nitrification, and the dissolved oxygen concentration is greater than 2 mg / L;

[0054] ;

[0055] In the anoxic zone, that is, away from the root position, nitrate nitrogen undergoes denitrification with biochar or organic carbon and is converted into nitrogen gas;

[0056] The inoculated salt-tolerant bacteria 17 is beneficial to the adaptive growth of the bacterial community and better adapts to saline wastewater; on the other hand, the inoculated salt-tolerant bacteria 17 simultaneously has a denitrification function, which promotes the denitrification function of the wetland; the biochar layer 16 provides a carbon source for the denitrifying bacteria community, ensuring an effective denitrification process; and ultimately achieving effective removal of nitrogen in the wastewater.

[0057] The experimental data of the performance of the product or result are as follows: Table 1 and Table 2:

[0058] 1) Table 1 shows the simulated wastewater configuration

[0059] 2) Table 2 shows the wastewater treatment results

[0060] Through the above device and method, the simulated wastewater effluent is finally achieved. The concentration meets the Class II water quality standard of GB 3838-2002 "Surface Water Environmental Quality Standard", and the COD meets the Class III water quality standard. When the concentration is lower than 2 mg / L, the antibiotic removal rate reaches 55%-78%.

[0061] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A device for synergistically treating tailwater using a layered adsorption and artificial wetland system, characterized by: It includes a layered selective adsorption treatment unit (1), a pyrolysis treatment unit (2) and an enhanced artificial wetland unit (3); The simulated wastewater enters the layered selective adsorption treatment unit (1) through the first peristaltic pump (4), and the antibiotics are removed respectively through the layered selective adsorption treatment unit (1) comprising a cationic adsorption layer (5), a hydrophobic adsorption layer (6) and a polar adsorption layer (7). The adsorption material is transported to the pyrolysis treatment unit (2) on one side. The effluent treated by the layered selective adsorption treatment unit (1) enters the enhanced artificial wetland unit (3) through the second peristaltic pump (14), and passes through the enhanced artificial wetland unit (3) comprising a gravel support layer (15), a biochar layer (16) and a volcanic rock layer (18) inoculated with salt-tolerant bacteria (17), thereby reducing the salinity and the inhibitory effect of antibiotics on denitrification microorganisms.

2. The device for synergistically treating tailwater using a layered adsorption and artificial wetland method according to claim 1, characterized in that: The three adsorption layers provided inside the layered selective adsorption treatment unit (1) are, from top to bottom, a cationic adsorption layer (5), a hydrophobic adsorption layer (6), and a polar adsorption layer (7). When the adsorption layer is enriched with antibiotics to a preset concentration threshold, the adsorption material saturated with adsorption on the adsorption layer enters the pyrolysis treatment unit (2) through an inclined guide trough (11) provided in parallel on one side, decomposes the antibiotics by pyrolysis, and regenerates them into stable biochar. The pyrolysis treatment unit (2) decomposes the enriched antibiotics to generate stable biochar.

3. The device for synergistically treating tailwater by layered adsorption and artificial wetland according to claim 2, characterized in that: A filter screen (8) is set at the bottom of each of the three adsorption layers. Among them, the cationic adsorption layer (5) is filled with sodium bentonite with a particle size of 0.5-2 mm. It adsorbs cationic antibiotics through cation exchange through its high specific surface area and negatively charged layered structure; the hydrophobic adsorption layer (6) is filled with corn cob iron-modified biochar with a particle size of 3-5 mm. It adsorbs hydrophobic antibiotics through the coordination and complexation provided by iron; the polar adsorption layer (7) is filled with a composite of amino-modified biochar and modified ceramsite with a particle size of 1-4 mm. It removes polar antibiotics through the mechanisms of hydrogen bonding, polar-polar interaction, and electrostatic adsorption.

4. The device for synergistically treating tailwater using a layered adsorption and artificial wetland method according to claim 3, characterized in that: The three adsorption layers are all connected to a sensor unit (9) and transmit indicators through a transmission device (12), wherein the indicators include ultraviolet absorption, total organic carbon, conductivity and pH.

5. The device for synergistically treating tailwater using a layered adsorption and artificial wetland method according to claim 4, characterized in that: The inclined guide grooves (11) are each provided with an automatic valve (10), which determines the adsorption saturation of the antibiotics in the adsorption layer according to the index collected by the sensor unit (9), and controls the opening and closing of the automatic valve (10) by means of a computer (13).

6. The device for synergistically treating tailwater using a layered adsorption and artificial wetland method according to claim 1, characterized in that: The enhanced artificial wetland unit (3) includes, from bottom to top, a gravel support layer (15), a biochar layer (16), and a volcanic rock layer (18); The surface of the volcanic rock layer (18) is used to plant salt-tolerant plants (19); the gravel support layer (15) is filled with gravel with an average particle size of 3 to 5 cm; and the biochar layer (16) includes a mixture of gravel and biochar.

7. The device for synergistic tailwater treatment using layered adsorption and artificial wetlands according to claim 1, characterized in that: The pyrolysis treatment unit (2) is provided with a temperature detection module (20), and the temperature of the pyrolysis treatment unit (2) is monitored by the temperature detection module (20).

8. A method for synergistically treating tailwater using layered adsorption and artificial wetlands, characterized by: The following steps are involved: S1. Strengthen the cultivation and start-up of the artificial wetland unit (3). All plants and substrates were cultured with simulated wastewater without antibiotics before the experiment, and salt-tolerant bacteria (17) were inoculated to start the microbial activity in the artificial wetland. Then the device was put into formal operation to treat wastewater; S2, the simulated wastewater enters the layered selective adsorption treatment unit (1), and the hydraulic retention time is set. Different types of antibiotics are adsorbed under the action of three adsorption layers; the sensor unit (9) is used to preliminarily determine whether the adsorbent is saturated; the saturation index alarm upper limit is set to perform linkage judgment, triggering the automatic valve (10) to perform thermal decomposition treatment on the adsorbent; S3, the effluent of the layered selective adsorption treatment unit (1) is controlled by the second peristaltic pump (14) and enters the enhanced artificial wetland unit (3), and the hydraulic retention time of the wetland is set; S4. Reactions occurring in the wetland volcanic rock layer (18) include: In the aerobic zone, that is, near the roots of plants, ammonia nitrogen is converted into nitrate nitrogen under nitrification, and the dissolved oxygen concentration is greater than 2 mg / L; In the anoxic zone, that is, away from the root position, nitrate nitrogen undergoes denitrification with biochar or organic carbon and is converted into nitrogen gas; The inoculated salt-tolerant bacteria (17) have been domesticated and can survive in saline wastewater, and the bacterial community itself has the function of denitrification, thus promoting the denitrification effect of the wetland; Provide carbon source for denitrifying bacteria through the biochar layer (16); Ultimately, effective removal of nitrogen from wastewater is achieved.

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