Domestic sewage treatment device and treatment method

Abstract

The invention relates to the technical field of sewage treatment, in particular to a domestic sewage treatment device and method. The sewage treatment device comprises a shell, an inner cavity of the shell is sequentially divided into a precipitation cavity, a first anoxic cavity, a second anoxic cavity and a clear water cavity, the precipitation cavity is provided with a water inlet pipe, communicating pipes are installed in other cavities, the precipitation cavity is provided with a water outlet module, and water inlets of the water inlet pipe and the communicating pipes are both higher than a water outlet; braided fillers are arranged in the precipitation cavity and the clear water cavity, carrier ball fillers are arranged in the first anoxic cavity and the second anoxic cavity, a deodorization assembly is arranged at the top of the precipitation cavity, inspection manholes are formed in the tops of the precipitation cavity, the second anoxic cavity and the clear water cavity, and the upper end of a communicating pipe of the first anoxic cavity penetrates out of the shell. According to the invention, the demand of decentralized sewage treatment in rural areas is met, and the problem of unstable energy supply in remote areas is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a domestic sewage treatment device and a treatment method. Background Art

[0002] In the existing rural domestic sewage treatment technology, a Chinese patent (Announcement No.: CN109867408) discloses a non-powered sewage purification tank, including an anoxic zone, a sedimentation chamber, and a disinfection zone. The zones are connected by connecting pipes, and the water is discharged by utilizing the liquid level difference, and the honeycomb inclined tube filler is passed through to realize the sedimentation of debris.

[0003] Although this sewage treatment tank does not require external energy, it has limitations in terms of convenience of later operation and maintenance, effluent water quality, etc. For example, it does not have the functions of absorbing sewage, deodorizing, replacing fillers, etc., and the effluent water quality after treatment cannot meet the requirements of high-standard uses such as irrigation. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of an embodiment of the present invention is to provide a domestic sewage treatment device, aiming to solve the demand for decentralized sewage treatment in rural areas, especially in remote areas with unstable energy supply, to provide a low-cost, low-energy solution to promote the development of local benign water circulation.

[0005] In order to achieve the above objectives, the embodiments of the present invention provide the following technical solutions: A domestic sewage treatment device comprises an outer shell, the inner cavity of which is divided into a sedimentation chamber, an anoxic first chamber, an anoxic second chamber and a clean water chamber in sequence, the sedimentation chamber is provided with a water inlet pipe, the remaining chambers are provided with connecting pipes, the sedimentation chamber is provided with a water outlet module, the water inlets of the water inlet pipe and the connecting pipe are both higher than the water outlet; braided fillers are provided in the sedimentation chamber and the clean water chamber, the anoxic first chamber and the anoxic second chamber are provided with carrier ball fillers, a deodorizing component is provided on the top of the sedimentation chamber, and inspection manholes are provided on the tops of the sedimentation chamber, the anoxic second chamber and the clean water chamber, and the upper end of the connecting pipe of the anoxic first chamber passes through the outer shell.

[0006] Optionally, the shell is a split structure, including an upper shell and a lower shell, the upper shell and the lower shell are detachably connected by a bolt pair, and the upper shell is installed with a lifting screw.

[0007] Optionally, a plurality of partitions are provided in the shell, and the partitions are plugged and installed in the shell, and the partitions divide the inner cavity of the shell into a sedimentation chamber, an anoxic chamber 1, an anoxic chamber 2 and a clean water chamber in sequence.

[0008] Optionally, slots are provided at the top of the lower shell and the bottom of the upper shell, and an insert plate is provided on one side of the partition. The insert plate is a T-shaped structure, including a horizontal plate and a vertical plate. The horizontal plate is located between the upper shell and the lower shell, and the vertical plate is inserted into the slots of the upper shell and the lower shell.

[0009] Optionally, the braided filler includes a filler body, a foam board and a counterweight block, wherein the foam board is installed in the outer shell, the filler body is installed on the lower side of the foam board, and the counterweight block is installed on the lower end of the filler body.

[0010] Optionally, a carrier support plate is installed on the lower side of the anoxic chamber 1 and the anoxic chamber 2, a carrier pressure plate is installed on the upper side of the anoxic chamber 2, and the carrier ball filler is located on the upper side of the carrier support plate and the lower side of the carrier pressure plate.

[0011] Optionally, the effective volume ratio of the sedimentation chamber, the first anoxic chamber, the second anoxic chamber and the clean water chamber is 2:2:1:1, and the hydraulic retention times are 60.16h, 60.24h, 37.52h and 27.28h respectively; the braided filler is placed in the sedimentation chamber and the clean water chamber at a filling ratio of 60% of the chamber volume, and the carrier ball filler is filled into the first anoxic chamber and the second anoxic chamber at 80% of the chamber volume.

[0012] Optionally, the deodorizing assembly includes an air inlet pipe and an air outlet pipe, the air inlet pipe and the air outlet pipe are respectively installed on two sides of the sedimentation chamber shell, and the height of the air outlet pipe is greater than the height of the air inlet pipe.

[0013] 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, the rotating seat is rotatably connected to the fixed seat, and the rotating seat has a rotating air blade.

[0014] The embodiment of the present invention further provides a treatment method using the domestic sewage treatment device as described above, comprising: The sewage flows into the sedimentation chamber, and after being adsorbed by the braided filler and processed by microbial metabolism, most of the organic pollutants in the sewage are removed, thus achieving primary treatment of the sewage. The sewage after primary treatment enters the anoxic chamber and is treated by microorganisms attached to the carrier balls to remove some nitrates, nitrogen and organic pollutants in the sewage, thus achieving secondary treatment of the sewage. The sewage after secondary treatment enters the anoxic second chamber, and is treated by microorganisms attached to the carrier balls, so that nitrates, nitrogen and organic pollutants in the sewage are further removed, thus achieving tertiary treatment of sewage. The sewage after tertiary treatment enters the clean water chamber and is again treated by adsorption of braided fillers and microbial metabolism to achieve quaternary sewage treatment.

[0015] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages: The sewage treatment device of the present invention reduces the difficulty and cost of later operation and maintenance by designing an easily replaceable packing module and a sewage suction function. Through multi-stage treatment, the volume ratio of each chamber, the residence time and a specific packing design, the organic matter removal rate is improved so that the effluent water quality meets the irrigation standard. Through the natural ventilation system, the odor in the treatment process is reduced and the surrounding environment is improved. Through the optimized design, the entire treatment process does not require the intervention of external energy, reducing energy consumption and operating costs.

[0016] The sewage treatment device of the present invention meets the demand for decentralized sewage treatment in rural areas, solves the problem of unstable energy supply in remote areas, develops the value of tail water reuse, and promotes the development of local benign water circulation.

[0017] Advantages of additional aspects of the present invention will be given in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In addition, the spacing or size between each other is exaggerated to show the position of each part, and the schematic diagram is only used for illustration.

[0019] Figure 1 is a schematic diagram of the appearance of a sewage treatment device provided by an embodiment of the present invention; Figure 2 Schematic diagram of a hidden upper shell of a sewage treatment device provided by an embodiment of the present invention; Figure 3 is a schematic diagram of the interior of a sewage treatment device provided by an embodiment of the present invention; Figure 4 is a schematic diagram of the connection between the upper shell and the lower shell provided by an embodiment of the present invention; Figure 5 is a schematic diagram of the cooperation between the partition and the shell provided by an embodiment of the present invention; Figure 6 is a schematic diagram of a braided packing provided by an embodiment of the present invention; Figure 7 is a schematic diagram of a deodorizing component provided by an embodiment of the present invention; Figure 8 is a schematic diagram of the top of an air outlet pipe provided in an embodiment of the present invention; In the figure: 11, 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, clean water chamber; 16, partition; 161, plug plate; 17, water outlet module; 21, water inlet pipe; 22, connecting pipe; 31, braided filler; 311, foam board; 312, filler body; 313, counterweight; 32, carrier ball filler; 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 DESCRIPTION It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0020] In order to solve the technical problems mentioned in the background technology, this embodiment proposes a rural domestic sewage treatment device that can absorb sewage, deodorize, replace fillers, and has water quality that meets irrigation standards. It greatly improves the convenience of subsequent operation and maintenance. The effluent water quality meets GB 5084-2021, and there is no external driving energy, which reduces the investment in operation and maintenance costs.

[0021] like Figure 1 , Figure 2 , Figure 3 As shown, the sewage treatment device includes a shell 11, the inner cavity of which is divided into a sedimentation chamber 12, an anoxic first chamber 13, an anoxic second chamber 14 and a clean water chamber 15 in sequence. The sedimentation chamber 12 is provided with a water inlet pipe 21, and the other chambers are connected by a connecting pipe 22. The sedimentation chamber 12 is provided with a water outlet module 17, the water inlets of the water inlet pipe 21 and the connecting pipe 22 are both higher than the water outlet, the sedimentation chamber 12 and the clean water chamber 15 are provided with braided fillers 31, the anoxic first chamber 13 and the anoxic second chamber 14 are provided with carrier ball fillers 32, the top of the sedimentation chamber 12 is provided with a deodorizing component, the top of the sedimentation chamber 12, the anoxic second chamber 14 and the clean water chamber 15 are provided with an inspection manhole, and a manhole cover is installed on the inspection port, and the upper end of the connecting pipe 22 of the anoxic first chamber 13 passes through the shell 11. The device realizes multi-stage treatment of sewage through the steps of sedimentation, biodegradation and filtration.

[0022] like Figure 4As shown, the housing 11 in this embodiment adopts a split structure, consisting of an upper shell 111 and a lower shell 112, which are detachably connected by a bolt pair 113. The connection is made by the bolt pair 113, and the design of the bolt pair 113 ensures the stability and detachability of the connection. A lifting screw 114 is installed on the top of the upper shell 111 to facilitate the installation and maintenance of the device. The design of the split structure makes the maintenance and overhaul of the device more convenient, and also improves the stability and durability of the device. During installation, first spray primer on the edge of the connecting flange, then use a pneumatic glue gun to apply a circle of structural sealant along the glue groove, and finally connect and fix the upper shell 111 and the lower shell 112 correspondingly with the bolt pair 113, and set the lifting screw 114 at the diagonal.

[0023] A plurality of partitions 16 are arranged in the housing 11, and the partitions 16 are plugged and installed in the housing 11 to divide the inner cavity into a sedimentation chamber 12, an anoxic chamber 13, an anoxic chamber 2 14 and a clean water chamber 15. The plug-in connection makes it easy to install and remove the partitions 16, and also ensures the independence of each chamber. The water inlet pipe 21 and the connecting pipe 22 are both L-shaped, and a straight pipe is added to the upper end of the connecting pipe 22 in the anoxic chamber 13 to form a T-shaped pipe.

[0024] like Figure 5 As shown, a slot 115 is provided at the top of the lower shell 112 and the bottom of the upper shell 111, and a plug plate 161 is provided on one side of the partition 16. The plug plate 161 is a T-shaped structure, including a horizontal plate and a vertical plate. The horizontal plate is located between the upper shell 111 and the lower shell 112, and the vertical plate is plugged 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.

[0025] like Figure 6 As shown, the braided filler 31 includes a filler body 312, a foam plate 311 and a counterweight 313. The foam plate 311 is installed in the housing 11 to provide support for the filler body 312. The filler body 312 is installed on the lower side of the foam plate 311 for adsorption and biodegradation. The counterweight 313 is installed at the lower end of the filler body 312 to ensure the stability of the filler and the effective adsorption effect. This design improves the stability and processing efficiency of the filler.

[0026] The braided filler 31 is placed in the sedimentation chamber 12 and the clean water chamber 15 at a filling ratio of 60% of the chamber volume. The braided filler 31 has a large specific surface area and can provide more attachment points for microorganisms. In the sedimentation chamber 12, microorganisms are more likely to form biofilms on the filler, thereby improving the biological treatment capacity of the system; the structure of the braided filler 31 can physically adsorb some suspended matter and organic matter, reducing the processing load of subsequent chambers. The braided filler 31 in the clean water chamber 15 can play a balancing role, reduce the impact load caused by insufficient front-end processing, improve the overall stability of the system, and can be used as a redundant design to improve the reliability and fault tolerance of the system.

[0027] A carrier support plate 33 is installed on the lower side of the anoxic chamber 13 and the anoxic chamber 2 14, and a carrier pressing plate 34 is installed on the upper side of the anoxic chamber 2 14. The carrier support plate 33 is used to support the carrier ball filler 32. The carrier pressing plate 34 is used to prevent the carrier ball filler 32 from overflowing.

[0028] The carrier ball filler 32 includes a Φ100 carrier ball, a carrier support plate 33 and a carrier pressing plate 34. After the shell mold is completed, the Φ100 carrier ball is filled into the anoxic first cavity 13 and the anoxic second cavity 14 according to 80% of the cavity volume. Denitrifying bacteria in the anoxic zone need to obtain electrons from nitrates. The polyurethane carrier ball has a good pore structure, which can promote the transmission of nutrients and oxygen and improve the mass transfer effect; and the polyurethane carrier will not be toxic to microorganisms, which is conducive to the growth and reproduction of microorganisms and accelerates the metabolic activities of microorganisms, thereby improving the biological treatment effect.

[0029] The effective volume ratio of the sedimentation chamber 12, the anoxic chamber 13, the anoxic chamber 2 14 and the clean water chamber 15 in this embodiment is 2:2:1:1, and the hydraulic retention time is 60.16h, 60.24h, 37.52h and 27.28h respectively. By setting the effective volume ratio and the hydraulic retention time, it is ensured that the sewage stays in each chamber for a sufficient time to achieve effective treatment and ensure that the treatment capacity of each chamber is matched. This design optimizes the effect and efficiency of sewage treatment.

[0030] like Figure 7 As shown, the deodorizing assembly includes an air inlet pipe 41 and an air outlet pipe 42. The air inlet pipe 41 is installed on one side of the housing 11 of the sedimentation chamber 12 to introduce fresh air. The air outlet pipe 42 is installed on the other side of the housing 11 of the sedimentation chamber 12 to discharge odor, and its height is greater than that of the air inlet pipe 41. This design effectively reduces the odor emission during sewage treatment.

[0031] like Figure 8As 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 wind blade, which improves the flexibility and adjustment ability of the deodorizing component.

[0032] The inlet pipe 41 is composed of a 110 (diameter mm, the same below) straight pipe, a 110 to 50 reducer, a 50 straight pipe, a 50 elbow and a 50 internal and external thread joint from top to bottom. The gas enters the sedimentation chamber 12 through the inlet pipe 41; the outlet pipe 42 is composed of a 110 straight pipe, a 110 to 50 reducer, a 50 straight pipe, a 50 elbow and a 50 internal and external thread joint from top to bottom. The gas flows to the outside air through the outlet pipe 42. Since the exhausted gas carries a variety of substances, in order to prevent the exhausted gas from flowing back to the sedimentation chamber 12 from the inlet pipe 41, the outlet pipe 42 is 1.5 meters higher than the inlet pipe 41; the deodorization component uses the pressure difference between the inside and outside of the device to achieve natural ventilation; the gas pressure inside the device is low, and it flows upward through the outlet pipe 42. The 110 straight pipe rotates when it encounters wind, which accelerates the outflow of gas. As the gas inside the device decreases and the pressure decreases, the external gas is "sucked" into the device, realizing gas circulation.

[0033] In summary, the T / L-type connecting pipe 22 provided in the device can realize the sewage suction operation of each functional cavity during the actual application process; the deodorization component provided can achieve the deodorization effect by ventilating the inside of the cavity through natural wind; the braided filler 31 module is placed in the sedimentation and clean water cavity 15, facing the inspection manhole above, so that the filler can be replaced; the hydraulic retention time of the sedimentation and anoxic cavity 13 is increased to improve the organic matter removal rate; the filler is filled in the order of braided filler 31, carrier ball filler 32, carrier ball filler 32, and braided filler 31, and the effluent water quality meets the irrigation standard. The device realizes energy-free operation while taking into account sewage suction, deodorization, filler replacement, and water quality reaching the standard.

[0034] This embodiment also proposes a treatment method of the above-mentioned sewage treatment device, comprising the following steps: The sewage flows into the sedimentation chamber 12 through the water inlet pipe 21 arranged at the water inlet end, realizing the flow state of up-in and down-out, avoiding short-flow. The sewage is first precipitated in static water at the bottom of the sedimentation chamber 12, and most of the organic pollutants in the sewage are removed through adsorption by the braided filler 31 and microbial metabolism. Then, the deodorization component performs local air circulation on the surface of the water body to remove part of the ammonia nitrogen in the sewage, realizing the primary treatment of the sewage.

[0035] The sewage after primary treatment enters the anoxic chamber 13 through the T-shaped connecting pipe 22, and is treated by the microorganisms attached to the carrier balls to remove part of the nitrate, nitrogen and organic pollutants in the sewage, thereby achieving secondary treatment of the sewage.

[0036] The sewage after secondary treatment enters the anoxic second chamber 14 through the L-shaped connecting pipe 22, and is treated by the microorganisms attached to the carrier balls, so that nitrate, nitrogen and organic pollutants in the sewage are further removed, thereby achieving tertiary treatment of the sewage.

[0037] After the tertiary treatment, the sewage enters the clean water chamber 15 and is treated by the braided filler 31 again through adsorption and microbial metabolism. The COD and ammonia nitrogen in the sewage are greatly reduced, thus achieving the quaternary treatment of the sewage.

[0038] The sewage after four treatments flows out through the outlet for ground infiltration or resource utilization.

[0039] For subsequent operation and maintenance of the device, the bottom of the device is vacuumed through the connecting pipe 22; the braided filler 31 is salvaged using special tools to replace the carrier.

[0040] Example 1 This implementation case uses the above-mentioned sewage treatment device to treat rural domestic sewage. The specific dimensions of the device are shown in Table 1, and the design flow rate is 300L / d.

[0041] Table 1

[0042] The influent is rural domestic sewage from a household in a certain city. Its water quality characteristics are as follows: COD concentration is 436.21 mg / L, NH4 + The -N concentration was 47.62 mg / L and the TP concentration was 6.84 mg / L.

[0043] The specific processing methods are: The sewage treatment device is connected to rural domestic sewage, and the water inlet flow rate is controlled at 300L / d. The hydraulic retention time of sewage in each chamber is shown in Table 1. Rural domestic sewage passes through the sedimentation chamber, anoxic chamber 1, anoxic chamber 2, and clean water chamber in turn before flowing out from the outlet.

[0044] The average concentration of effluent pollutants is: COD concentration is 33.52mg / L, NH4 + The -N concentration was 29.84 mg / L and the TP concentration was 6.53 mg / L.

[0045] Example 2 The influent is rural domestic sewage from a household in a certain city. Its water quality characteristics are as follows: COD concentration is 501.52 mg / L, NH4 + The -N concentration was 60.43 mg / L and the TP concentration was 8.02 mg / L.

[0046] The specific processing methods are: The sewage treatment device is connected to rural domestic sewage, and the water inlet flow rate is controlled at 300L / d. The rural domestic sewage passes through the sedimentation chamber, the first anoxic chamber, the second anoxic chamber, and the clean water chamber in turn before flowing out from the outlet.

[0047] The average concentration of effluent pollutants is: COD concentration is 53.66 mg / L, NH4 + The -N concentration was 45.46 mg / L and the TP concentration was 7.63 mg / L.

[0048] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it 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 on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A domestic sewage treatment device, characterized in that: It comprises a shell, the inner cavity of which is divided into a sedimentation chamber, an anoxic chamber 1, an anoxic chamber 2 and a clean water chamber in sequence, the sedimentation chamber is provided with a water inlet pipe, the other chambers are provided with connecting pipes, the sedimentation chamber is provided with a water outlet module, and the water inlets of the water inlet pipe and the connecting pipe are both higher than the water outlet; The sedimentation chamber and the clean water chamber are provided with braided fillers, the anoxic chamber 1 and the anoxic chamber 2 are provided with carrier ball fillers, the top of the sedimentation chamber is provided with a deodorizing assembly, the tops of the sedimentation chamber, the anoxic chamber 2 and the clean water chamber are provided with inspection manholes, and the upper end of the connecting pipe of the anoxic chamber 1 passes through the outer shell.

2. The domestic sewage treatment device according to claim 1, characterized in that: The housing is a split structure, comprising an upper housing and a lower housing, the upper housing and the lower housing are detachably connected via a bolt pair, and a lifting screw is installed on the upper housing.

3. The domestic sewage treatment device according to claim 2, characterized in that: A plurality of partitions are arranged in the shell, and the partitions are plugged and installed in the shell. The partitions divide the inner cavity of the shell into a sedimentation cavity, an anoxic cavity 1, an anoxic cavity 2 and a clean water cavity in sequence.

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

5. The domestic sewage treatment device according to claim 1, characterized in that: The braided filler comprises a filler body, a foam plate and a counterweight block, wherein the foam plate is installed in the shell, the filler body is installed at the lower side of the foam plate, and the counterweight block is installed at the lower end of the filler body.

6. The domestic sewage treatment device according to claim 1, characterized in that: A carrier support plate is installed at the lower side of the anoxic chamber 1 and the anoxic chamber 2, a carrier pressure plate is installed at the upper side of the anoxic chamber 2, and the carrier ball filler is located at the upper side of the carrier support plate and the lower side of the carrier pressure plate.

7. The domestic sewage treatment device according to claim 1, characterized in that: The effective volume ratio of the sedimentation chamber, the first anoxic chamber, the second anoxic chamber and the clean water chamber is 2:2:1:1, and the hydraulic retention times are 60.16h, 60.24h, 37.52h and 27.28h respectively. The braided filler is placed in the sedimentation chamber and the clean water chamber at a filling ratio of 60% of the chamber volume, and the carrier ball filler is filled into the first anoxic chamber and the second anoxic chamber at 80% of the chamber volume.

8. The domestic sewage treatment device according to claim 1, characterized in that: The deodorizing assembly comprises an air inlet pipe and an air outlet pipe, wherein the air inlet pipe and the air outlet pipe are respectively installed on two sides of the sedimentation chamber shell, and the height of the air outlet pipe is greater than that of the air inlet pipe.

9. The domestic sewage treatment device according to claim 8, characterized in that: The air outlet pipe comprises an air extraction pipe, a fixed seat and a rotating seat, wherein the fixed seat is installed on the top of the air extraction pipe, the rotating seat is rotatably connected with the fixed seat, and the rotating seat has a rotating air blade.

10. A method for treating domestic sewage using the domestic sewage treatment device according to any one of claims 1 to 9, characterized in that: include: The sewage flows into the sedimentation chamber, and after being adsorbed by the braided filler and processed by microbial metabolism, most of the organic pollutants in the sewage are removed, thus achieving primary treatment of the sewage. The sewage after primary treatment enters the anoxic chamber and is treated by microorganisms attached to the carrier balls to remove some nitrates, nitrogen and organic pollutants in the sewage, thus achieving secondary treatment of the sewage. The sewage after secondary treatment enters the anoxic second chamber, and is treated by microorganisms attached to the carrier balls, so that nitrates, nitrogen and organic pollutants in the sewage are further removed, thus achieving tertiary treatment of sewage. The sewage after tertiary treatment enters the clean water chamber and is again treated by adsorption of braided fillers and microbial metabolism to achieve quaternary sewage treatment.

Images