Domestic sewage treatment device and treatment method

Abstract

The present application relates to sewage treatment technical field, especially to a kind of domestic sewage treatment device and processing method.Wastewater treatment device includes shell, the inner chamber of the shell is sequentially separated into sedimentation chamber, anoxic one chamber, anoxic two chambers and clear water chamber, the sedimentation chamber is provided with water inlet pipe, and the rest chamber is installed with communicating pipe, and the sedimentation chamber is provided with water outlet module, and the water inlet of water inlet pipe and communicating pipe is higher than outlet;The sedimentation chamber and clear water chamber are provided with braided filler, the anoxic one chamber and anoxic two chambers are provided with carrier ball filler, the top of the sedimentation chamber is provided with deodorization component, the top of the sedimentation chamber, anoxic two chambers and clear water chamber is provided with manhole, and the upper end of the communicating pipe of anoxic one chamber is out of shell.By the present application, the needs of rural area decentralized sewage treatment are met, and the problem of unstable energy supply in remote areas is solved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a domestic wastewater treatment device and treatment method. Background Technology

[0002] Among the existing rural domestic sewage treatment technologies, Chinese patent (publication number: CN109867408) discloses a non-powered sewage purification tank, which includes an anoxic zone, a sedimentation chamber, and a disinfection zone. The zones are connected in series by connecting pipes, and water is discharged by means of liquid level difference. Honeycomb inclined tube packing is also used to achieve the sedimentation of impurities.

[0003] Although this wastewater treatment tank does not require external power, it has limitations in terms of ease of operation and maintenance and effluent quality. For example, it lacks functions such as sludge suction, deodorization, and packing replacement, and the treated effluent quality cannot meet the requirements of high-standard applications such as irrigation. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a domestic sewage treatment device that addresses the need for decentralized sewage treatment in rural areas, particularly in remote areas where energy supply is unstable. This device offers a low-cost, low-energy solution to promote healthy water cycle development in the local area.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] A domestic sewage treatment device includes an outer shell, the inner cavity of which is sequentially divided into a sedimentation chamber, an anoxic chamber I, an anoxic chamber II, and a clear water chamber. The sedimentation chamber is provided with an inlet pipe, and the other chambers are equipped with connecting pipes. The sedimentation chamber is provided with an outlet module. The inlets of the inlet pipe and the connecting pipe are both higher than the outlets. Braided packing is provided in the sedimentation chamber and the clear water chamber. Carrier ball packing is provided in the anoxic chamber I and the anoxic chamber II. A deodorization component is provided at the top of the sedimentation chamber. Inspection manholes are provided at the top of the sedimentation chamber, the anoxic chamber II, and the clear water chamber. The upper end of the connecting pipe of the anoxic chamber I extends out of the outer shell.

[0007] Optionally, the outer shell is a split structure, including an upper shell and a lower shell, which are detachably connected by bolts, and the upper shell is equipped with lifting screws.

[0008] Optionally, the outer shell is provided with multiple partitions, which are inserted and installed inside the outer shell. The partitions divide the inner cavity of the outer shell into a sedimentation chamber, an anoxic chamber 1, an anoxic chamber 2, and a clear water chamber in sequence.

[0009] Optionally, slots are provided at the top of the lower housing and the bottom of the upper housing, and an insert plate is provided on one side of the partition. The insert plate has a T-shaped structure, including a horizontal plate and a vertical plate. The horizontal plate is located between the upper housing and the lower housing, and the vertical plate is inserted into the slots of the upper housing and the lower housing.

[0010] Optionally, the braided packing includes a packing body, a foam board, and a counterweight. The foam board is installed inside the housing, the packing body is installed on the underside of the foam board, and the counterweight is installed at the lower end of the packing body.

[0011] Optionally, a carrier support plate is installed on the lower side of the first and second hypoxia chambers, and a carrier pressure plate is installed on the upper side of the second hypoxia chamber. The carrier ball packing is located on the upper side of the carrier support plate and the lower side of the carrier pressure plate.

[0012] Optionally, the effective volume ratio of the sedimentation chamber, anoxic chamber 1, anoxic chamber 2, and clear water chamber is 2:2:1:1, and the hydraulic retention times are 60.16h, 60.24h, 37.52h, and 27.28h, respectively. Braided packing is placed in the sedimentation chamber and clear water chamber at a filling ratio of 60% of the chamber volume, and carrier ball packing is filled in the anoxic chamber 1 and anoxic chamber 2 at a filling ratio of 80% of the chamber volume.

[0013] Optionally, the deodorization component includes an air inlet pipe and an air outlet pipe, which are respectively installed on both sides of the sedimentation chamber shell, and the height of the air outlet pipe is greater than the height of the air inlet pipe.

[0014] Optionally, the air outlet pipe includes an air extraction pipe, a fixed seat, and a rotating seat. The fixed seat is installed on the top of the air extraction pipe, and the rotating seat is rotatably connected to the fixed seat, and the rotating seat has rotating vanes.

[0015] This invention also provides a treatment method using the domestic sewage treatment device described above, comprising:

[0016] Wastewater flows into the sedimentation chamber, where it is treated by the adsorption of braided packing and the metabolism of microorganisms, removing most of the organic pollutants and achieving primary treatment of the wastewater.

[0017] After primary treatment, the wastewater enters the anoxic chamber and is treated by microorganisms attached to the carrier balls to remove some of the nitrates, nitrogen, and organic pollutants, thus achieving secondary treatment of the wastewater.

[0018] After secondary treatment, the wastewater enters the anoxic secondary chamber, where it undergoes further treatment by microorganisms attached to the carrier spheres, resulting in the removal of nitrates, nitrogen, and organic pollutants, thus achieving tertiary treatment of the wastewater.

[0019] After tertiary treatment, the wastewater enters the clear water chamber, where it undergoes further treatment through adsorption by the braided packing material and microbial metabolism, thus achieving tertiary treatment.

[0020] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0021] The wastewater treatment device of this invention reduces the difficulty and cost of later operation and maintenance by designing easily replaceable packing modules and a sludge suction function. Through multi-stage treatment, the volume ratio of each chamber, retention time, and specific packing design, the organic matter removal rate is improved, ensuring that the effluent quality meets irrigation standards. A natural ventilation system reduces odor during the treatment process, improving the surrounding environment. Through optimized design, the entire treatment process requires no external energy input, reducing energy consumption and operating costs.

[0022] The wastewater treatment device of this invention meets the needs of decentralized wastewater treatment in rural areas, solves the problem of unstable energy supply in remote areas, develops the value of wastewater reuse, and promotes the healthy development of local water cycle.

[0023] Advantages of additional aspects of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In addition, the spacing or dimensions between the parts are exaggerated to show the position of each part, and the schematic diagrams are for illustrative purposes only.

[0025] Figure 1 This is a schematic diagram of the external appearance of the wastewater treatment device provided in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the hidden upper shell of the sewage treatment device provided in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the internal structure of the wastewater treatment device provided in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the connection between the upper and lower housings provided in an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the partition and the shell fitting together according to an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the braided packing provided in an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the deodorization component provided in an embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of the top of the air outlet pipe provided in an embodiment of the present invention;

[0033] In the diagram: 11. Outer shell; 111. Upper shell; 112. Lower shell; 113. Bolt pair; 114. Lifting screw; 115. Slot; 12. Sedimentation chamber; 13. Anoxic chamber 1; 14. Anoxic chamber 2; 15. Clear water chamber; 16. Partition plate; 161. Insert plate; 17. Water outlet module; 21. Inlet pipe; 22. Connecting pipe; 31. Braided packing; 311. Foam board; 312. Packing body; 313. Counterweight; 32. Carrier ball packing; 33. Carrier support plate; 34. Carrier pressure plate; 41. Air inlet pipe; 42. Air outlet pipe; 421. Rotating seat; 422. Fixed seat; 423. Air extraction pipe; Detailed Implementation

[0034] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0035] To address the technical problems mentioned in the background section, this embodiment proposes a rural domestic sewage treatment device that can absorb sludge, deodorize, replace filler, and ensure water quality meets irrigation standards. This greatly improves the convenience of later operation and maintenance, the effluent quality meets GB 5084-2021, and it requires no external driving energy, thus reducing operation and maintenance costs.

[0036] like Figure 1 , Figure 2 , Figure 3As shown, the wastewater treatment device includes an outer shell 11, the inner cavity of which is sequentially divided into a sedimentation chamber 12, an anoxic chamber 13, an anoxic chamber 2 14, and a clear water chamber 15. The sedimentation chamber 12 is equipped with an inlet pipe 21, and the other chambers are connected by connecting pipes 22. The sedimentation chamber 12 is equipped with an effluent module 17. The inlets of the inlet pipe 21 and the connecting pipe 22 are both higher than the outlets. Braided packing material 31 is installed in the sedimentation chamber 12 and the clear water chamber 15. Carrier ball packing material 32 is installed in the anoxic chamber 13 and the anoxic chamber 2 14. A deodorization component is installed at the top of the sedimentation chamber 12. Inspection manholes are provided at the top of the sedimentation chamber 12, the anoxic chamber 2 14, and the clear water chamber 15, with manhole covers installed on the manholes. The upper end of the connecting pipe 22 of the anoxic chamber 13 extends out of the outer shell 11. This device achieves multi-stage wastewater treatment through sedimentation, biodegradation, and filtration.

[0037] like Figure 4 As shown, the outer casing 11 in this embodiment adopts a split structure, consisting of an upper casing 111 and a lower casing 112, which are detachably connected by bolt pairs 113. The bolt pairs 113 ensure both stability and detachability of the connection. Lifting screws 114 are installed on the top of the upper casing 111 for easy installation and maintenance. The split structure design makes maintenance and repair more convenient, while also improving the stability and durability of the device. During installation, first, primer is sprayed onto the connecting flange edge, then structural sealant is applied around the groove using a pneumatic glue gun. Finally, the upper casing 111 is connected and fixed to the lower casing 112 using bolt pairs 113, with lifting screws 114 positioned diagonally.

[0038] Multiple partitions 16 are installed inside the outer casing 11, which are plugged into the casing 11 to divide the inner cavity into a sedimentation chamber 12, an anoxic chamber 13, an anoxic chamber 2 14, and a clear water chamber 15. The plug-in connection makes the partitions 16 easy to install and remove, while also ensuring the independence of each chamber. The inlet pipe 21 and the connecting pipe 22 are both L-shaped. In the anoxic chamber 13, the upper end of the connecting pipe 22 is extended to form a T-shaped pipe.

[0039] like Figure 5 As shown, slots 115 are provided at the top of the lower housing 112 and the bottom of the upper housing 111. An insert plate 161 is provided on one side of the partition 16. The insert plate 161 has a T-shaped structure, including a horizontal plate and a vertical plate. The horizontal plate is located between the upper housing 111 and the lower housing 112, and the vertical plate is inserted into the slot 115. This design makes the structure of the partition 16 more stable and also facilitates the assembly and disassembly of the device.

[0040] like Figure 6As shown, the braided packing 31 includes a packing body 312, a foam board 311, and a counterweight 313. The foam board 311 is installed inside the housing 11 to provide support for the packing body 312. The packing body 312 is installed below the foam board 311 for adsorption and biodegradation. The counterweight 313 is installed at the lower end of the packing body 312 to ensure the stability of the packing and effective adsorption. This design improves the stability and treatment efficiency of the packing.

[0041] Braided packing material 31 is placed in the sedimentation chamber 12 and the clear water chamber 15 at a filling ratio of 60% of the chamber volume. Braided packing material 31 has a large specific surface area, providing more attachment points for microorganisms. In the sedimentation chamber 12, microorganisms more easily form biofilms on the packing material, thereby improving the system's biological treatment capacity. The structure of braided packing material 31 can physically adsorb some suspended solids and organic matter, reducing the treatment load on subsequent chambers. In the clear water chamber 15, braided packing material 31 can play a balancing role, reducing the impact load caused by insufficient front-end treatment, improving the overall stability of the system, and serving as a redundant design to improve the system's reliability and fault tolerance.

[0042] Carrier support plates 33 are installed on the lower side of the anoxic chamber 13 and the anoxic chamber 2 14, and a carrier pressure plate 34 is installed on the upper side of the anoxic chamber 2 14. The carrier support plates 33 are used to support the carrier ball packing 32. The carrier pressure plate 34 is used to prevent the carrier ball packing 32 from overflowing.

[0043] The carrier ball packing 32 includes Φ100 carrier balls, a carrier support plate 33, and a carrier pressure plate 34. After the shell mold is completed, the Φ100 carrier balls are filled into the anoxic chamber 13 and the anoxic chamber 2 14 to 80% of the chamber volume. Denitrifying bacteria in the anoxic zone need to obtain electrons from nitrates. The polyurethane carrier balls have a good porous structure, which can promote the transport of nutrients and oxygen, improving the mass transfer effect. Furthermore, the polyurethane carrier does not have a toxic effect on microorganisms, which is beneficial to the growth and reproduction of microorganisms and accelerates their metabolic activities, thus improving the biological treatment effect.

[0044] In this embodiment, the effective volume ratio of the sedimentation chamber 12, anoxic chamber 13, anoxic chamber 2 14, and clear water chamber 15 is 2:2:1:1, with hydraulic retention times of 60.16h, 60.24h, 37.52h, and 27.28h, respectively. By setting the effective volume ratio and hydraulic retention times, sufficient time is ensured for wastewater to remain in each chamber, achieving effective treatment and guaranteeing matching treatment capacities among chambers. This design optimizes the effect and efficiency of wastewater treatment.

[0045] like Figure 7As shown, the deodorization assembly includes an inlet pipe 41 and an outlet pipe 42. The inlet pipe 41 is installed on one side of the outer shell 11 of the sedimentation chamber 12 to introduce fresh air. The outlet pipe 42 is installed on the other side of the outer shell 11 of the sedimentation chamber 12 to discharge odorous gases, and its height is greater than that of the inlet pipe 41. This design effectively reduces odor emissions during wastewater treatment.

[0046] like Figure 8 As shown, the air outlet pipe 42 includes an air extraction pipe 423, a fixed seat 422, and a rotating seat 421. The fixed seat 422 is installed on the top of the air extraction pipe 423. The rotating seat 421 is rotatably connected to the fixed seat 422, and the rotating seat 421 has a rotating fan blade, which improves the flexibility and adjustability of the deodorization component.

[0047] The 41 inlet pipes, from top to bottom, consist of a 110mm (diameter in mm) straight pipe, a 110mm to 50mm reducer, a 50mm straight pipe, a 50mm elbow, and a 50mm internal / external threaded connector. Gas enters the sedimentation chamber 12 through the 41 inlet pipes. The 42 outlet pipes, from top to bottom, consist of a vent pipe, a 110mm straight pipe, a 110mm to 50mm reducer, a 50mm straight pipe, a 50mm elbow, and a 50mm internal / external threaded connector. Gas flows into the outside air through the 42 outlet pipes. Because the discharged gas contains various substances, to prevent the discharged gas from flowing back into the sedimentation chamber 12 from the 41 inlet pipes, the 42 outlet pipes are 1.5 meters higher than the 41 inlet pipes. The deodorization component utilizes the pressure difference between the inside and outside of the device to achieve natural ventilation. The gas pressure inside the device is low, so it flows upwards through the 42 outlet pipes. The vent pipe rotates in the wind, accelerating the gas outflow. As the gas pressure inside the device decreases, the external gas is "drawn" into the device, achieving gas circulation.

[0048] In summary, the T / L-type connecting pipe 22 of this device enables sludge suction in each functional chamber during practical application; the deodorization component achieves deodorization through natural ventilation of the chambers; the braided packing module 31 is placed in the sedimentation and clear water chamber 15, directly above the maintenance manhole, allowing for packing replacement; the hydraulic retention time in the sedimentation and anoxic chamber 13 is increased, improving the organic matter removal rate; the packing is filled in the order of braided packing 31, carrier ball packing 32, carrier ball packing 32, and braided packing 31, ensuring that the effluent quality meets irrigation standards. The device achieves zero-energy operation while simultaneously handling sludge suction, deodorization, packing replacement, and ensuring water quality compliance.

[0049] This embodiment also proposes a treatment method for the above-mentioned wastewater treatment device, including the following steps:

[0050] Wastewater flows into the sedimentation chamber 12 through the inlet pipe 21 at the inlet end, achieving an upward flow and downward outflow pattern to avoid short-circuiting. The wastewater undergoes static sedimentation at the bottom of the sedimentation chamber 12, followed by adsorption by the braided packing 31 and treatment by microbial metabolism, removing most of the organic pollutants. Then, a deodorization component circulates localized air around the water surface to remove some ammonia nitrogen, achieving primary wastewater treatment.

[0051] After primary treatment, the wastewater enters the anoxic chamber 13 through the T-shaped connecting pipe 22. After being treated by microorganisms attached to the carrier sphere, some of the nitrates, nitrogen, and organic pollutants in the wastewater are removed, thus achieving secondary treatment of the wastewater.

[0052] After secondary treatment, the wastewater enters the anoxic secondary chamber 14 through the L-shaped connecting pipe 22. After treatment by microorganisms attached to the carrier sphere, nitrates, nitrogen, and organic pollutants in the wastewater are further removed, achieving tertiary treatment of the wastewater.

[0053] After tertiary treatment, the wastewater enters the clear water chamber 15 and undergoes further treatment via adsorption and microbial metabolism by the braided packing material 31. This significantly reduces COD and ammonia nitrogen levels, achieving tertiary wastewater treatment.

[0054] After four treatments, the wastewater flows out through the outlet for infiltration or resource utilization.

[0055] For subsequent operation and maintenance of the device, the bottom of the device is vacuumed through the connecting pipe 22; and the braided packing 31 is retrieved using special tools for carrier replacement.

[0056] Example 1

[0057] This implementation case utilizes the aforementioned wastewater treatment device to treat rural domestic sewage. The specific dimensions of the device are shown in Table 1, and the design flow rate is 300 L / d.

[0058] Table 1

[0059]

[0060] The influent was domestic sewage from a rural household in a certain city, and its water quality characteristics were as follows: COD concentration was 436.21 mg / L, NH4+ concentration was... + The -N concentration was 47.62 mg / L, and the TP concentration was 6.84 mg / L.

[0061] The specific processing method is as follows:

[0062] The sewage treatment device is connected to rural domestic sewage, and the influent flow rate is controlled at 300L / d. The hydraulic retention time of sewage in each chamber is shown in Table 1. The rural domestic sewage flows out from the outlet after passing through the sedimentation chamber, the anoxic chamber 1, the anoxic chamber 2, and the clear water chamber in sequence.

[0063] The average concentration of pollutants in the effluent was: COD concentration was 33.52 mg / L, NH4+ concentration was 100 mg / L. + The -N concentration was 29.84 mg / L, and the TP concentration was 6.53 mg / L.

[0064] Example 2

[0065] The influent was domestic sewage from a rural household in a certain city, and its water quality characteristics were as follows: COD concentration was 501.52 mg / L, NH4+ concentration was... + The -N concentration was 60.43 mg / L, and the TP concentration was 8.02 mg / L.

[0066] The specific processing method is as follows:

[0067] The sewage treatment device is connected to rural domestic sewage, and the influent flow rate is controlled at 300L / d. The rural domestic sewage flows out from the outlet after passing through the sedimentation chamber, the anoxic chamber 1, the anoxic chamber 2, and the clear water chamber.

[0068] The average concentration of pollutants in the effluent was: COD concentration was 53.66 mg / L, NH4+ concentration was 100 mg / L. + The -N concentration was 45.46 mg / L, and the TP concentration was 7.63 mg / L.

[0069] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A domestic sewage treatment device, characterized in that, The device includes an outer shell, the inner cavity of which is sequentially divided into a sedimentation chamber, an oxygen-deficient chamber 1, an oxygen-deficient chamber 2, and a clear water chamber. The sedimentation chamber is equipped with a water inlet pipe, and the other chambers are equipped with connecting pipes. The sedimentation chamber is equipped with a water outlet module. The inlets of the water inlet pipe and the connecting pipe are both higher than the outlets. The effective volume ratio of the sedimentation chamber, anoxic chamber 1, anoxic chamber 2, and clear water chamber is 2:2:1:1, and the hydraulic retention times are 60.16h, 60.24h, 37.52h, and 27.28h, respectively. Braided packing is placed in the sedimentation chamber and clear water chamber at a filling ratio of 60% of the chamber volume, and carrier ball packing is filled in the anoxic chamber 1 and anoxic chamber 2 at a filling ratio of 80% of the chamber volume. Braided packing is provided in the sedimentation chamber and the clear water chamber, and carrier ball packing is provided in the first and second anoxic chambers. A deodorization component is provided at the top of the sedimentation chamber. A maintenance manhole is provided at the top of the sedimentation chamber, the second anoxic chamber and the clear water chamber. The upper end of the connecting pipe of the first anoxic chamber extends out of the outer shell. The deodorization component includes an air inlet pipe and an air outlet pipe, which are respectively installed on both sides of the outer shell of the sedimentation chamber. The height of the air outlet pipe is greater than that of the air inlet pipe. The air outlet pipe includes an air extraction pipe, a fixed seat, and a rotating seat. The fixed seat is installed on the top of the air extraction pipe, and the rotating seat is rotatably connected to the fixed seat. The rotating seat has a rotating fan blade.

2. The domestic sewage treatment device as described in claim 1, characterized in that, The outer shell is a split structure, including an upper shell and a lower shell, which are detachably connected by bolts. The upper shell is equipped with lifting screws.

3. The domestic sewage treatment device as described in claim 2, characterized in that, The outer shell is provided with multiple partitions, which are inserted into the outer shell and divide the inner cavity of the outer shell into a sedimentation chamber, an anoxic chamber 1, an anoxic chamber 2, and a clear water chamber in sequence.

4. The domestic sewage treatment device as described in claim 3, characterized in that, The top of the lower housing and the bottom of the upper housing are provided with slots. A plug plate is provided on one side of the partition. The plug plate has a T-shaped structure, including a horizontal plate and a vertical plate. The horizontal plate is located between the upper housing and the lower housing, and the vertical plate is inserted into the slots of the upper housing and the lower housing.

5. The domestic sewage treatment device as described in claim 1, characterized in that, The braided packing includes a packing body, a foam board, and a counterweight. The foam board is installed inside the outer shell, the packing body is installed on the underside of the foam board, and the counterweight is installed at the lower end of the packing body.

6. The domestic sewage treatment device as described in claim 1, characterized in that, The lower sides of the first and second hypoxia chambers are equipped with carrier support plates, and the upper side of the second hypoxia chamber is equipped with a carrier pressure plate. The carrier ball packing is located above the carrier support plate and below the carrier pressure plate.

7. A treatment method using a domestic sewage treatment device as described in any one of claims 1-6, characterized in that, include: Wastewater flows into the sedimentation chamber, where it is treated by the adsorption of braided packing and the metabolism of microorganisms, removing most of the organic pollutants and achieving primary treatment of the wastewater. After primary treatment, the wastewater enters the anoxic chamber and is treated by microorganisms attached to the carrier balls to remove some of the nitrates, nitrogen, and organic pollutants, thus achieving secondary treatment of the wastewater. After secondary treatment, the wastewater enters the anoxic secondary chamber, where it undergoes further treatment by microorganisms attached to the carrier spheres, resulting in the removal of nitrates, nitrogen, and organic pollutants, thus achieving tertiary treatment of the wastewater. After tertiary treatment, the wastewater enters the clear water chamber, where it undergoes further treatment through adsorption by the braided packing material and microbial metabolism, thus achieving tertiary treatment.

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