Intermittent aeration type biochar-based wetland sewage purification system

Abstract

The invention discloses an intermittent aeration type charcoal-based wetland sewage purification system which comprises a water tank, the interior of the water tank is divided into a purification bin and a sewage bin, the interior of the water tank is fixedly communicated with a circulation assembly, the interior of the sewage bin is filled with a purification assembly, the top of the water tank is fixedly provided with a control assembly, and the interior of the water tank is fixedly provided with a sliding assembly. An aeration assembly is fixedly installed in the sliding assembly, one end of the sliding assembly is fixedly connected with a sealing assembly, the top of the sliding assembly fixedly communicates with a gas conveying assembly, a communicating assembly is fixedly installed between the gas conveying assembly and the aeration assembly, a plurality of access holes are formed in one side of the water pool at equal intervals, and lead screws are fixedly installed on the two sides of the multiple access holes correspondingly. According to the intermittent aeration type biochar-based wetland sewage purification system disclosed by the invention, after the aeration device is used for a long time, the maintenance of aeration blockage can be accelerated, and the maintenance time of the aeration blockage can be greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of constructed wetland wastewater purification, in particular to an intermittent aeration type biochar-based wetland wastewater purification system. BACKGROUND

[0002] With the acceleration of urbanization and the development of agricultural scale, the discharge of domestic wastewater, agricultural tail water and low-concentration industrial wastewater continues to grow. If the organic pollutants such as nitrogen, phosphorus and some heavy metals contained in such wastewater are not effectively treated and directly discharged, it is easy to cause ecological problems such as water body eutrophication and black and odorous water body, which threatens water resource safety and ecological balance. Under this background, constructed wetland has become one of the important technologies for small and medium-sized wastewater purification due to its low cost, simple operation and ecological friendliness. However, the traditional constructed wetland has many technical bottlenecks in practical application, and it is difficult to meet the increasingly strict wastewater discharge standards. The existing aeration type biochar-based wetland wastewater purification system is usually composed of a water pool, a water conveying assembly, a purification filling layer and an aeration system.

[0003] However, the existing biochar-based wetland wastewater purification pool has the problem that after long-term use, because a large amount of suspended solids such as silt, debris and unprecipitated colloidal substances are often wrapped in the wastewater, in the aeration process, the airflow generated by the aeration device drives the wastewater to flow, and these suspended solids are gradually gathered to the aeration area under the joint action of the airflow and the water flow. Because the aeration device is usually provided with fine pores to generate small bubbles to improve the oxygen dissolution efficiency, the suspended solids are easily attached and accumulated at the pores, and the pores are blocked over time, which hinders the air flow, causes uneven aeration, the dissolved oxygen content in some areas is sharply reduced, and the microorganisms are difficult to efficiently decompose pollutants due to lack of oxygen, and the wastewater purification effect is greatly reduced.

[0004] Therefore, it is necessary to provide an intermittent aeration type biochar-based wetland wastewater purification system. SUMMARY

[0005] The present application aims to provide an intermittent aeration type biochar-based wetland wastewater purification system to solve the problem of the existing biochar-based wetland wastewater purification pool in the background art that after long-term use, because a large amount of suspended solids such as silt, debris and unprecipitated colloidal substances are often wrapped in the wastewater, in the aeration process, the airflow generated by the aeration device drives the wastewater to flow, and these suspended solids are gradually gathered to the aeration area under the joint action of the airflow and the water flow. Because the aeration device is usually provided with fine pores to generate small bubbles to improve the oxygen dissolution efficiency, the suspended solids are easily attached and accumulated at the pores, and the pores are blocked over time, which hinders the air flow, causes uneven aeration, the dissolved oxygen content in some areas is sharply reduced, and the microorganisms are difficult to efficiently decompose pollutants due to lack of oxygen, and the wastewater purification effect is greatly reduced.

[0006] In order to achieve the above object, the present application provides the following technical scheme: a intermittent aeration type biochar-based wetland sewage purification system, including a pool, one side of the pool is fixedly connected with an inspection well, the inside of the pool is divided into a purification bin and a sewage bin, the inside of the pool is fixedly communicated with a flow assembly, the inside of the sewage bin is filled with a purification assembly, the top of the pool is fixedly installed with a control assembly, the inside of the pool is fixedly installed with a sliding assembly, the inside of the sliding assembly is fixedly installed with an aeration assembly, one end of the sliding assembly is fixedly connected with a sealing assembly, the top of the sliding assembly is fixedly communicated with a gas conveying assembly, the gas conveying assembly and the aeration assembly are fixedly installed with a connecting assembly, a plurality of inspection openings are equidistantly arranged on one side of the pool, and a plurality of lead screws are fixedly installed on the two sides of the inspection openings.

[0007] Preferably, the flow assembly comprises a water conveying pipe, a water collecting pipe and a water outlet pipe, one end of the water conveying pipe extends into the inside of the sewage bin, the water collecting pipe is fixedly installed on the inner wall of the purification bin, one end of the water collecting pipe extends into the inside of the sewage bin, a plurality of water outlet holes are equidistantly arranged on the water collecting pipe, and one end of the water outlet pipe extends into the inside of the purification bin.

[0008] Preferably, the purification assembly comprises a gravel layer, the gravel layer is filled on the bottom wall of the purification bin, a biochar layer is filled on the top of the gravel layer, a quartz sand layer is filled on the top of the biochar layer, a soft fine sand layer is filled on the top of the quartz sand layer, and a plurality of aquatic green plants grow on the top of the soft fine sand layer, the soft fine sand layer and the quartz sand layer pretreat the sewage, intercept suspended impurities, avoid the pore blockage of the biochar layer, and prolong the service life of the biochar.

[0009] Preferably, the sliding assembly comprises a plurality of porous fixed shells, the plurality of porous fixed shells are equidistantly fixedly installed in the inside of the purification bin, the porous fixed shells are embedded in the inside of the gravel layer, a sliding frame is slidably installed in the inside of the porous fixed shell, and water permeable plates are fixedly installed on the top and the bottom of the sliding frame, when the aeration assembly is blocked, the aeration assembly can be extracted and cleaned from the inspection opening without damage, the maintenance time is shortened, the stable operation of the aeration system is ensured, and the purification efficiency is improved.

[0010] Preferably, the aeration assembly comprises a plurality of aeration pipes, the plurality of aeration pipes are respectively fixedly installed in the inside of the plurality of sliding frames, a plurality of aeration discs are equidistantly installed on the top of the aeration pipe, a connecting pipe is fixedly communicated with one end of the aeration pipe, and one end of the connecting pipe penetrates through one end of the sliding frame.

[0011] Preferably, the gas conveying assembly comprises an aeration pump, one end of the aeration pump is fixedly communicated with a gas main pipe, a plurality of gas branch pipes are equidistantly fixedly communicated on one side of the gas main pipe, a valve is installed on one end of the gas branch pipe, and the other end of the plurality of gas branch pipes respectively extends into the inside of the plurality of porous fixed shells.

[0012] Preferably, the on-off assembly comprises a plurality of joints and a plurality of sliding frames, the plurality of joints are respectively in fixed communication with a plurality of gas supply branch pipes, the plurality of sliding frames are respectively fixedly installed inside a plurality of communication pipes, the outside of the joint is sleeved with a circular sealing ring, and one end of the joint is fixedly installed with a top rod.

[0013] Preferably, the middle part of the plurality of sliding frames is slidably installed with a sliding rod, one end of the sliding rod is fixedly installed with a ball valve, the other end of the sliding rod is sleeved with a spring, one end of the plurality of springs is respectively fixedly connected with the plurality of sliding frames, the other end of the plurality of springs is respectively fixedly installed on the plurality of sliding rods, the gas supply branch pipe and the communication pipe are sealedly connected, air leakage is prevented, when the sliding frame is extracted for maintenance, the ball valve is automatically closed, sewage is prevented from flowing back into the gas supply branch pipe, the normal operation of the gas path system is ensured, and the stability and reliability of the system operation are improved.

[0014] Preferably, the sealing assembly comprises a plurality of connecting blocks, the plurality of connecting blocks are respectively fixedly installed at one end of the plurality of sliding frames, one end of the connecting block is fixedly installed with a fixed plate, the plurality of connecting blocks are respectively slidably connected with a plurality of maintenance openings, the fixed plate is located outside the water tank, the inner side of the fixed plate is fixedly connected with a square sealing ring, and the both ends of the fixed plate are fixedly installed with locking pieces, the plurality of locking pieces are respectively slidably connected outside the plurality of lead screws, good sealing is realized at the maintenance opening, sewage leakage is prevented, the position of the sliding frame is fixed, the sealing property and structural stability of the purification bin are ensured, and the normal operation of the system is ensured.

[0015] Preferably, the control assembly comprises a PH value sensor and a control box, the PH value sensor and the control box are fixedly installed at the top of the water tank, the inside of the control box is fixedly installed with a signal receiver and a central mainboard, the central mainboard is sequentially installed with a logic operation module and a controller, and the detection end of the PH value sensor is placed inside the purification bin.

[0016] Compared with the prior art, the beneficial effects of the present application are:

[0017] Through the cooperation of the sliding assembly and the sealing assembly, after the aeration device is used for a long time, the maintenance of aeration blockage can be accelerated, the maintenance time of aeration blockage can be greatly reduced, the purification efficiency fluctuation caused by the damage of the substrate layer can be avoided, and the operation and maintenance difficulty and cost can be significantly reduced;

[0018] Through the control assembly, the water quality of the purification bin can be monitored in real time, the aeration pump can be automatically controlled to start and stop, the manual sampling time cost can be reduced, and the intermittent aeration can save energy to a certain extent. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1It is a three-dimensional structure schematic view of the biochar-based wetland sewage purification system of the present application.

[0020] Figure 2 It is a top view of the biochar-based wetland sewage purification system of the present application.

[0021] Figure 3 It is a gas delivery assembly diagram of the biochar-based wetland sewage purification system of the present application.

[0022] Figure 4 It is a sliding assembly diagram of the biochar-based wetland sewage purification system of the present application.

[0023] Figure 5 It is an internal diagram of the sliding assembly of the biochar-based wetland sewage purification system of the present application.

[0024] Figure 6 It is a switching assembly diagram of the biochar-based wetland sewage purification system of the present application.

[0025] Figure 7 It is a purification assembly diagram of the biochar-based wetland sewage purification system of the present application.

[0026] Figure 8 It is a sealing assembly diagram of the biochar-based wetland sewage purification system of the present application.

[0027] Figure 9 It is a control assembly diagram of the biochar-based wetland sewage purification system of the present application.

[0028] In the figure: 1, water pool; 2, purification bin; 3, sewage bin; 4, water delivery pipe; 5, water collection pipe; 6, water outlet hole; 7, water outlet pipe; 8, gravel layer; 9, biochar layer; 10, quartz sand layer; 11, soft fine sand layer; 12, aquatic green plants; 13, controller; 14, manhole; 15, porous fixed shell; 16, sliding frame; 17, water-permeable plate; 18, connecting block; 19, fixed plate; 20, square sealing ring; 21, locking piece; 22, screw rod; 23, aeration pipe; 24, aeration disc; 25, logic operation module; 26, communication pipe; 27, gas delivery branch pipe; 28, joint; 29, circular sealing ring; 30, jacking rod; 31, sliding frame; 32, sliding rod; 33, ball valve; 34, spring; 35, gas delivery main pipe; 36, valve; 37, aeration pump; 38, PH value sensor; 39, control box; 40, signal receiver; 41, central mainboard. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0030] Please refer to Figures 1-9The application provides an intermittent aeration type biochar-based wetland sewage purification system, which comprises a pool 1, a manhole 14 fixedly connected to one side of the pool 1, an inner part of the pool 1 being divided into a purification bin 2 and a sewage bin 3, a flow assembly fixedly communicated in the pool 1, a purification assembly filled in the sewage bin 3, a control assembly fixedly installed on the top of the pool 1, a sliding assembly fixedly installed in the pool 1, an aeration assembly fixedly installed in the sliding assembly, a sealing assembly fixedly connected to one end of the sliding assembly, a gas conveying assembly fixedly communicated with the top of the sliding assembly, a connecting assembly fixedly installed between the gas conveying assembly and the aeration assembly, a plurality of manholes equidistantly formed in one side of the pool 1, and lead screws 22 fixedly installed on the two sides of the plurality of manholes.

[0031] Further, the flow assembly comprises a water conveying pipe 4, a water collecting pipe 5 and a water outlet pipe 7, one end of the water conveying pipe 4 extending into the sewage bin 3, the water collecting pipe 5 being fixedly installed on the inner wall of the purification bin 2, one end of the water collecting pipe 5 extending into the sewage bin 3, a plurality of water outlets 6 equidistantly formed in the water collecting pipe 5, and one end of the water outlet pipe 7 extending into the purification bin 2, sewage entering the sewage bin 3 from the water conveying pipe 4, being discharged into the purification bin 2 from the plurality of water outlets 6 on the water collecting pipe 5 after reaching a certain height, and being discharged through the water outlet pipe 7 after purification by the artificial wetland.

[0032] Further, the purification assembly comprises a gravel layer 8, the gravel layer 8 being filled in the bottom wall of the purification bin 2, a biochar layer 9 filled on the top of the gravel layer 8, a quartz sand layer 10 filled on the top of the biochar layer 9, a soft fine sand layer 11 filled on the top of the quartz sand layer 10, and a plurality of aquatic green plants 12 grown on the top of the soft fine sand layer 11, the soft fine sand layer 11, the quartz sand layer 10, the biochar layer 9 and the gravel layer 8 being sequentially filled in the purification bin 2 from top to bottom, the soft fine sand layer 11 being the finest and the gravel layer 8 being the coarsest, and the sewage being subjected to multi-stage purification.

[0033] Further, the sliding assembly comprises a plurality of porous fixed shells 15 which are fixedly installed equidistantly in the interior of the purification bin 2, the porous fixed shells 15 are embedded in the interior of the gravel layer 8, the interior of the porous fixed shell 15 is slidably installed with a sliding frame 16, the top and bottom of the sliding frame 16 are fixedly installed with water permeable plates 17, the aeration assembly comprises a plurality of aeration pipes 23 which are fixedly installed in the interior of the plurality of sliding frames 16 respectively, the top of the aeration pipe 23 is equidistantly installed with a plurality of aeration discs 24, one end of the aeration pipe 23 is fixedly communicated with a communicating pipe 26, one end of the communicating pipe 26 penetrates through one end of the sliding frame 16, the gas conveying assembly comprises an aeration pump 37, one end of the aeration pump 37 is fixedly communicated with a gas conveying main pipe 35, one side of the gas conveying main pipe 35 is equidistantly fixedly communicated with a plurality of gas conveying branch pipes 27, one end of the gas conveying branch pipe 27 is installed with a valve 36, the other end of the plurality of gas conveying branch pipes 27 respectively extends to the interior of the plurality of porous fixed shells 15, the connecting assembly comprises a plurality of joints 28 and a plurality of sliding frames 31, the plurality of joints 28 are fixedly communicated with the plurality of gas conveying branch pipes 27 respectively, the plurality of sliding frames 31 are fixedly installed in the interior of the plurality of communicating pipes 26 respectively, the exterior of the joint 28 is sleeved with a circular sealing ring 29, one end of the joint 28 is fixedly installed with a jacking rod 30, the middle part of the plurality of sliding frames 31 is slidably installed with a sliding rod 32, one end of the sliding rod 32 is fixedly installed with a ball valve 33, the other end of the sliding rod 32 is sleeved with a spring 34, one end of the plurality of springs 34 is fixedly connected with the plurality of sliding frames 31 respectively, the other end of the plurality of springs 34 is fixedly installed on the plurality of sliding rods 32 respectively, one end of the plurality of porous fixed shells 15 is opposite to the plurality of manholes, the sliding frame 16 in the interior of the porous fixed shell 15 can be pulled out from the manhole, when pulled out, the sliding rod 32 is away from the jacking rod 30, the sliding rod 32 drives the ball valve 33 to close under the action of the spring 34, when the sliding frame 16 is pushed back, the sliding rod 32 is close to the jacking rod 30, one end of the sliding rod 32 is extruded to slide by the jacking rod 30, driving the ball valve 33 at the other end to open.

[0034] Further, the sealing assembly comprises a plurality of connecting blocks 18 which are fixedly installed at one end of the plurality of sliding frames 16 respectively, one end of the connecting block 18 is fixedly installed with a fixed plate 19, the plurality of connecting blocks 18 are slidably connected with the plurality of manholes respectively, the fixed plate 19 is located at the exterior of the water tank 1, the inner side of the fixed plate 19 is fixedly connected with a square sealing ring 20, both ends of the fixed plate 19 are fixedly installed with locking pieces 21, the plurality of locking pieces 21 are slidably connected at the exterior of the plurality of lead screws 22 respectively, by penetrating the locking pieces 21 at both ends of the fixed plate 19 through the lead screw 22 and then screwing with the nut, the locking piece 21 can drive the fixed plate 19 to extrude the square sealing ring 20, thereby sealing the manhole to prevent leakage.

[0035] Further, the control assembly comprises a PH value sensor 38 and a control box 39, both of which are fixedly installed on the top of the water tank 1, the inside of the control box 39 is fixedly installed with a signal receiver 40 and a central mainboard 41, the central mainboard 41 is sequentially installed with a logic operation module 25 and a controller 13, the detection end of the PH value sensor 38 is placed in the inside of the purification bin 2, the PH value sensor 38 is fixedly installed on the top of the water tank 1, the detection end is placed in the purification bin 2, the PH value of the sewage in the purification bin 2 is monitored uninterruptedly, real-time data support is provided for system operation, the PH value data monitored by the PH value sensor 38 is transmitted to the signal receiver 40 in the control box 39 in the form of electric signal, the signal receiver 40 is responsible for receiving these data and transmitting them to the central mainboard 41, the logic operation module 25 on the central mainboard 41 deeply analyzes the received PH value data, judges whether the PH value of the current sewage is in the normal interval according to the preset normal PH value range, if the PH value is abnormal, the logic operation module 25 will further analyze the abnormal reason, for example, whether the PH value is decreased due to the production of acidic substances caused by nitrification reaction or other factors cause the PH value fluctuation, based on the analysis result of the logic operation module 25, the controller 13 generates corresponding control instructions. When it is detected that the concentration of organic matter and ammonia nitrogen in the sewage is high, the aeration time is prolonged to enhance the activity of aerobic microorganisms and promote the decomposition of organic matter and the nitrification reaction of ammonia nitrogen, when the PH value exceeds the normal range, the aeration frequency is adjusted to maintain the acid-base balance of the sewage.

[0036] The application embodiment is used as follows: the water inlet pipe 4 of the flow assembly is opened to slowly introduce the sewage to be treated into the sewage bin 3, until the liquid level of the sewage bin 3 reaches the water collecting pipe 5, so that the sewage is uniformly penetrated into the soft fine sand layer 11 of the purification bin 2 through the water outlet holes 6 on the water collecting pipe 5, the water outlet state of the water outlet pipe 7 is observed to ensure that there is no short circuit and no leakage of water flow, the intermittent aeration cycle is set through the control box 39, the PH value of the sewage in the purification bin monitored in real time by the PH value sensor 38 is combined with the logic operation module 25, when aeration is performed, the controller 13 starts the aeration pump 37, and simultaneously opens the valves 36 of all the gas supply branch pipes 27, the compressed air is distributed to each gas supply branch pipe 27 through the gas supply main pipe 35, enters the communication pipe 26 through the joint 28 of the connecting assembly, smoothly enters the aeration pipe 23, and is finally dispersed into micro-bubbles through the aeration disc 24, and is uniformly released between the gravel layer 8 and the biochar layer 9, the micro-bubbles are diffused upward under the penetration of water flow, the dissolved oxygen in the biochar layer 9 area is maintained at 2-4 mg / L, the activity of aerobic microorganisms is activated, the heterotrophic bacteria decompose the organic pollutants in the sewage, the nitrifying bacteria convert the ammonia nitrogen into nitrate, the soft fine sand layer 11 and the quartz sand layer 10 intercept the suspended impurities in the sewage, the aquatic green plants 12 absorb part of the nitrogen and phosphorus through the root system, after the aeration is set for a certain time, the controller 13 closes the aeration pump 37 and the valves 36 on the gas supply branch pipes 27, the DO in the purification bin 2 gradually decreases, and enters an anoxic state, the denitrifying bacteria convert the nitrate accumulated in the aeration stage into nitrogen gas and release it into the atmosphere by taking the organic carbon adsorbed by the biochar layer 9 as a carbon source, at the same time, the anaerobic microorganisms assist in decomposing part of the refractory organic matter, in this stage, the water outlet pipe 7 is opened to discharge the purified sewage, the routine maintenance is performed every thirty days, the water inlet is stopped, the aeration pump 37 and all the valves 36 are closed, after the sewage in the purification bin 2 is discharged through the water outlet pipe 7, the locking piece 21 on the screw rod 22 on the two sides of the maintenance opening is loosened, the connecting block 18 is pulled through the external fixed plate 19, the sliding frame 16 is integrally extracted from the porous fixed shell 15 together with the aeration pipe 23 and the aeration disc 24, one end of the sliding rod 32 is separated from the extrusion of the jacking rod 30, at this time, the spring 34 drives the sliding rod 32 to reset, so that the ball valve 33 is closed, then the water permeable plate 17 at the top is disassembled, it is observed that the yellow-brown biofilm and fine suspended matter are attached to the surface of the aeration disc 24, the aeration disc 24 is washed by using a high-pressure water gun, and whether the aeration pipe 23 is damaged is checked at the same time; after the cleaning is completed, the sliding frame 16 is pushed back to the porous fixed shell 15, so that the locking piece 21 passes through the corresponding screw rod 22, the maintenance opening is sealed through the square sealing ring 20, then the screw rod 22 is screwed through the nut, so that the locking piece 21 is extruded and fixed, at this time, the jacking rod 30 at one end of the joint 28 re-pushes the sliding rod 32 on the sliding frame 31 in the communication pipe 26, compresses the spring 34 and opens the ball valve 33, air can smoothly enter the aeration pipe 23, and the maintenance work can be completed.

[0037] The components are all general standard components or components known to those skilled in the art, the structure and principle of which can be known by those skilled in the art through technical manuals or through conventional experimental methods. All the electrical devices described above should refer to the working principle described above, and the electrical devices are sequentially connected in order to complete the electrical connection. The detailed connection means is a known technology in the art.

[0038] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements to some of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An intermittent aeration biochar-based wetland wastewater purification system comprising a basin (1), characterized in that: The side of the pool (1) is fixedly connected with an inspection well (14), the inside of the pool (1) is divided into a purification bin (2) and a sewage bin (3), the inside of the pool (1) is fixedly communicated with a flow assembly, the inside of the sewage bin (3) is filled with a purification assembly, the top of the pool (1) is fixedly installed with a control assembly, the inside of the pool (1) is fixedly installed with a sliding assembly, the inside of the sliding assembly is fixedly installed with an aeration assembly, one end of the sliding assembly is fixedly connected with a sealing assembly, the top of the sliding assembly is fixedly communicated with a gas conveying assembly, the gas conveying assembly and the aeration assembly are fixedly installed with a connecting assembly, a plurality of inspection openings are equidistantly formed in the side of the pool (1), and the two sides of the plurality of inspection openings are fixedly installed with lead screws (22).

2. The intermittent aeration biological carbon-based wetland wastewater purification system according to claim 1, characterized in that: The flow assembly comprises a water conveying pipe (4), a water collecting pipe (5) and a water outlet pipe (7), one end of the water conveying pipe (4) extends into the inside of the sewage bin (3), the water collecting pipe (5) is fixedly installed on the inner wall of the purification bin (2), one end of the water collecting pipe (5) extends into the inside of the sewage bin (3), a plurality of water outlet holes (6) are equidistantly formed in the water collecting pipe (5), and one end of the water outlet pipe (7) extends into the inside of the purification bin (2).

3. The intermittent aeration biological carbon-based wetland wastewater purification system according to claim 1, characterized in that: The purification assembly comprises a gravel layer (8), the gravel layer (8) is filled on the bottom wall of the purification bin (2), the top of the gravel layer (8) is filled with a biochar layer (9), the top of the biochar layer (9) is filled with a quartz sand layer (10), the top of the quartz sand layer (10) is filled with a soft fine sand layer (11), and the top of the soft fine sand layer (11) is grown with a plurality of aquatic green plants (12).

4. The intermittent aeration biological carbon-based wetland wastewater purification system according to claim 3, characterized in that: The sliding assembly comprises a plurality of porous fixed shells (15), the plurality of porous fixed shells (15) are equidistantly fixedly installed in the inside of the purification bin (2), the porous fixed shells (15) are embedded in the inside of the gravel layer (8), the inside of the porous fixed shell (15) is slidably installed with a sliding frame (16), and the top and the bottom of the sliding frame (16) are fixedly installed with water permeable plates (17).

5. The intermittent aeration biological carbon-based wetland wastewater purification system according to claim 4, characterized in that: The aeration assembly comprises a plurality of aeration pipes (23), the plurality of aeration pipes (23) are respectively fixedly installed in the inside of the plurality of sliding frames (16), the top of the aeration pipe (23) is equidistantly installed with a plurality of aeration discs (24), one end of the aeration pipe (23) is fixedly communicated with a communicating pipe (26), and one end of the communicating pipe (26) penetrates one end of the sliding frame (16).

6. The intermittent aeration biological carbon-based wetland wastewater purification system according to claim 4, characterized in that: The gas conveying assembly comprises an aeration pump (37), one end of the aeration pump (37) is fixedly communicated with a gas conveying main pipe (35), one side of the gas conveying main pipe (35) is equidistantly fixedly communicated with a plurality of gas conveying branch pipes (27), one end of the gas conveying branch pipe (27) is installed with a valve (36), and the other end of the plurality of gas conveying branch pipes (27) respectively extends into the inside of the plurality of porous fixed shells (15).

7. The intermittent aeration biological carbon-based wetland wastewater purification system according to claim 6, characterized in that: The on component includes multiple joints (28) and multiple sliding frames (31), multiple joints (28) are respectively fixedly communicated with multiple gas branch pipes (27), multiple sliding frames (31) are respectively fixedly installed inside multiple communication pipes (26), the outside of joint (28) is provided with a circular sealing ring (29), one end of joint (28) is fixedly installed with a top rod (30).

8. The intermittent aeration biological carbon-based wetland wastewater purification system according to claim 7, characterized in that: The middle part of multiple sliding frames (31) is slidably installed with a sliding rod (32), one end of sliding rod (32) is fixedly installed with a ball valve (33), the other end of sliding rod (32) is provided with a spring (34), one end of multiple springs (34) is respectively fixedly connected with multiple sliding frames (31), the other end of multiple springs (34) is respectively fixedly installed on multiple sliding rods (32).

9. The intermittent aeration biological carbon-based wetland wastewater purification system according to claim 4, characterized in that: The sealing assembly includes multiple connecting blocks (18), multiple connecting blocks (18) are respectively fixedly installed at one end of multiple sliding frames (16), one end of connecting block (18) is fixedly installed with a fixed plate (19), multiple connecting blocks (18) are respectively slidably connected with multiple access holes, the fixed plate (19) is located outside the water tank (1), the inner side of fixed plate (19) is fixedly connected with a square sealing ring (20), both ends of fixed plate (19) are fixedly installed with locking pieces (21), multiple locking pieces (21) are respectively slidably connected outside multiple lead screws (22).

10. The intermittent aeration biological carbon-based wetland wastewater purification system according to claim 1, characterized in that: The control assembly includes a pH sensor (38) and a control box (39), the pH sensor (38) and the control box (39) are fixedly installed on the top of the water tank (1), the inside of the control box (39) is fixedly installed with a signal receiver (40) and a central mainboard (41), the central mainboard (41) is sequentially installed with a logic operation module (25) and a controller (13), the detection end of the pH sensor (38) is placed inside the purification bin (2).

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