Staged sewage treatment equipment

Abstract

The utility model discloses staged sewage treatment equipment and relates to the technical field of sewage treatment. The device comprises a filter barrel, a purification barrel and a sterilization barrel, a filter pipe is clamped and fixed in the center of the filter barrel, the purification barrel is arranged on one side of the peripheral surface of the filter barrel, a stirring barrel is clamped and fixed in the center of the purification barrel, a stirring motor is clamped in the center of the top of the purification barrel, and the sterilization barrel is arranged on one side of the peripheral surface of the purification barrel. An activated carbon filtering assembly is clamped and fixed in the center of the sterilizing barrel, and an ultraviolet sterilizing lamp is clamped and fixed on the inner edge of the sterilizing barrel. Through the arrangement of the filter barrel, the purification barrel and the sterilization barrel, the problems that a staged sewage treatment device is relatively complex in structure and inconvenient to maintain and clean, and the device is difficult to adjust quickly when sewage components change are solved, and in order to ensure that sewage is fully treated in a plurality of treatment structures, the sewage treatment efficiency is improved. A liquid pump and the like need to be used for enabling sewage to circularly flow in equipment, so that the cost and the maintenance expenditure are increased.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and in particular relates to a graded wastewater treatment device. Background Technology

[0002] Wastewater refers to polluted wastewater from domestic and industrial processes. It is mainly classified into industrial wastewater, domestic sewage, commercial wastewater, and surface runoff. Wastewater treatment refers to the process of purifying wastewater to meet the water quality requirements for discharge into a water body or for reuse. Wastewater treatment is widely used in various fields such as construction, agriculture, transportation, energy, petrochemicals, environmental protection, urban landscaping, medical care, and catering. However, due to the different sources of wastewater, it contains various harmful substances. To improve the convenience of wastewater treatment, graded wastewater treatment equipment is usually used to treat multiple harmful substances in wastewater in stages for efficient processing. However, it still has the following drawbacks in practical use:

[0003] The utility model disclosed in CN208517085U is a graded sewage treatment device. The top of the tank is connected to an inlet pipe, the inner cavity of the tank is fixedly connected to a first filter screen, and the inner cavity of the tank and the bottom of the first filter screen are fixedly connected to a fixed frame. The inside of the fixed frame is fixedly connected to a circulation pipe, the top of the circulation pipe is connected to the fixed frame, the bottom of the circulation pipe is connected to an outlet pipe, and the outlet pipe extends to the outside of the fixed frame. The structure of the graded sewage treatment device is relatively fixed and complex, which is not convenient for maintenance and deep cleaning. In addition, since the harmful components in the sewage will change with time, seasons and other factors, the treatment range of the device needs to be adjusted in a timely manner to cope with the changes in sewage. The treatment device is difficult to quickly adjust multiple treatment structures, and its flexibility of use is low.

[0004] When a graded wastewater treatment device processes wastewater in stages, the wastewater is constantly being generated, causing it to pass rapidly through multiple treatment structures within the device. Since the wastewater cannot be fully treated in a single treatment structure, structures such as liquid pumps are needed to circulate the wastewater, which greatly increases the treatment cost and maintenance expenses. Utility Model Content

[0005] The purpose of this utility model is to provide a graded sewage treatment equipment. By using a filter tank, a purification tank, and a sterilization tank, it solves the problems of the complex structure of graded sewage treatment equipment, which is inconvenient to maintain and clean. It also solves the problems of the difficulty in quickly adjusting the equipment when the sewage composition changes, and the need to use liquid pumps to circulate the sewage within the equipment in order to ensure that the sewage is fully treated in multiple treatment structures, which increases the cost and maintenance expenses.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This utility model is a graded sewage treatment device, including a filter tank, a purification tank, and a sterilization tank. A filter tube is fixedly connected to the center of the filter tank, and a lifting cylinder is fixedly connected to the top of the filter tank. A purification tank is set on one side of the outer periphery of the filter tank. A stirring tank is fixedly connected to the center of the purification tank, and a stirring motor is fixedly connected to the top center of the purification tank. A heating tube is suspended inside the purification tank and is located on the outer periphery of the stirring tank. A sterilization tank is set on one side of the outer periphery of the purification tank, and an activated carbon filter assembly is fixedly connected to the center of the sterilization tank. An ultraviolet germicidal lamp is fixedly connected to the inner edge of the sterilization tank.

[0008] After wastewater is poured into the filter tank, solid particles in the wastewater are filtered through the filter pipes. A lifting cylinder drives a scraper to move up and down, cleaning the filter pipes to prevent clogging and ensure filtration efficiency. The pre-filtered wastewater then enters the purification tank, where flocculants are added. A stirring motor drives the stirring blades, ensuring thorough mixing of the flocculants and wastewater, causing harmful components to flocculate and precipitate. When the water level is higher than the mixing tank, some wastewater is poured outside, allowing it to settle within the purification tank for further reaction of harmful components. A heating element heats the wastewater. The system maintains wastewater at a suitable reaction temperature, improving reaction efficiency and ensuring thorough treatment. Multiple purification tanks can be connected as needed to treat different components of the wastewater in stages. The purification tanks have a simple structure and are easy to replace reagents. After entering the sterilization tank, the wastewater is sterilized by ultraviolet germicidal lamps. After entering the first limiting pipe, the wastewater passes through an activated carbon filter to adsorb odors, further treating the wastewater. The flow of wastewater within and between the filter, purification, and sterilization tanks relies solely on gravity; the equipment does not require additional pumps for wastewater transport, reducing treatment costs and maintenance expenses.

[0009] Furthermore, a first water outlet pipe is welded through the top of the outer periphery of the filter barrel, a first sewage discharge pipe is welded through the center of the bottom of the filter barrel, a first universal wheel is rotatably engaged around the bottom of the filter barrel, a telescopic tube is slidably engaged at the bottom of the lifting cylinder, a scraper is engaged at the bottom of the telescopic tube, and the outer periphery of the scraper is attached to the inner wall of the filter tube.

[0010] The first universal wheel allows the filter canister to be moved, facilitating connection between the filter canister and the purification canister and improving the convenience of loading and unloading. The filter tube filters solid particles in the wastewater, and the lifting cylinder drives the scraper to move up and down to clean the filter tube, preventing clogging and ensuring filtration efficiency.

[0011] Furthermore, a second drain pipe is welded through the center of the bottom of the purification tank, a third drain pipe is welded through the edge of the bottom of the purification tank, a second caster is rotatably engaged with the edge of the bottom of the purification tank, a first connecting pipe is engaged through the top of the outer circumference of the purification tank, a second water outlet pipe is welded through the top of the outer circumference of the purification tank, one end of the first connecting pipe is engaged with one end of the first water outlet pipe, and the other end of the first connecting pipe is inserted through the heating pipe and the outer circumference of the stirring tank.

[0012] The second caster wheel allows the purification tank to be moved, facilitating connections between filter tanks and purification tanks, between two purification tanks, and between a purification tank and a sterilization tank. This improves the ease of loading and unloading, allows staff to promptly inspect and clean individual components of each device, and makes it easy to adjust the number of purification tanks according to the composition of the wastewater, ensuring wastewater treatment efficiency.

[0013] Furthermore, a first screen is attached to the top of the mixing tank, a stirring rod is attached to the bottom of the stirring motor, a stirring blade is attached to the outer circumference of the stirring rod, the stirring rod is inserted through the top of the first screen, the stirring blade is attached to the bottom of the first screen, the first screen is located at the top of the first connecting pipe, a second screen is attached to the top of the outer circumference of the heating pipe, the outer circumference of the second screen is attached to the inner wall of the purification tank, and the second screen is located at the bottom of the second water outlet pipe;

[0014] After the wastewater enters the mixing tank, the corresponding flocculant is poured into the mixing tank. The mixing motor drives the mixing blades to rotate, stirring the wastewater and the agent to ensure thorough mixing and reaction. When the water level in the mixing tank is higher than the top of the tank, the sediment is screened through the first screen for the first step of separation. The wastewater flows to the outside of the mixing tank and settles in the purification tank, allowing the wastewater to further react with the agent and flocculate and settle. The wastewater is heated by the heating pipe to keep it at a suitable reaction temperature, improving reaction efficiency and ensuring thorough treatment of the wastewater. When the water level reaches the second screen, the sediment in the purification tank is prevented from entering the next purification tank or sterilization tank.

[0015] Furthermore, a second connecting pipe is welded through the top of the outer periphery of the sterilization tank, a third water outlet pipe is snapped through the bottom of the outer periphery of the sterilization tank, a fourth sewage pipe is welded through the bottom edge of the sterilization tank, a third universal wheel is rotatably snapped through the bottom edge of the sterilization tank, and the second connecting pipe is snapped through one end of the second water outlet pipe.

[0016] The third omnidirectional wheel allows the sterilization tank to be moved, facilitating connection between the sterilization and purification tanks and improving loading and unloading convenience. Furthermore, the flow of wastewater inside and between the filter, purification, and sterilization tanks relies solely on gravity, eliminating the need for additional pumps or other equipment to transport wastewater and reducing treatment costs and maintenance expenses.

[0017] Furthermore, a first limiting tube is fixedly engaged inside the sterilization tank. The first limiting tube is located on the outer peripheral surface of the activated carbon filter assembly. A second limiting tube is engaged on the outer peripheral surface of the first limiting tube. The second limiting tube hangs from the top of the third water outlet pipe. The third water outlet pipe is inserted through and connected to the first limiting tube and the outer peripheral surface of the activated carbon filter assembly.

[0018] After entering the sterilization tank, the wastewater is sterilized by ultraviolet sterilization lamps. When the water level between the second limit pipe and the first limit pipe is higher than the top of the first limit pipe, the wastewater enters the first limit pipe and is adsorbed by the activated carbon filter. The treated wastewater is then discharged through the third outlet pipe.

[0019] This utility model has the following beneficial effects:

[0020] This invention addresses the problems of relatively fixed and complex structures in tiered wastewater treatment devices, which are inconvenient for maintenance and deep cleaning, and require timely adjustments to the treatment range due to the constantly changing harmful components in wastewater with time and seasons. It also solves the inflexibility of quickly adjusting multiple treatment structures. By incorporating filter, purification, and sterilization tanks, this invention allows operators to connect multiple purification tanks as needed for step-by-step treatment of different wastewater components. The invention simplifies the structure of individual purification tanks and facilitates movement of the filter, purification, and sterilization tanks via first, second, and third casters. This facilitates connections between filter and purification tanks, between two purification tanks, and between purification and sterilization tanks, improving loading and unloading convenience. It also allows for timely maintenance and cleaning of individual structures within each device and enables adjustments to the number of purification tanks based on wastewater composition, ensuring efficient wastewater treatment.

[0021] This invention solves the problem of multi-stage wastewater treatment devices where wastewater is constantly generated and rapidly passes through multiple treatment structures, making it difficult to fully treat the wastewater within a single structure. This necessitates the use of pumps or other structures to circulate the wastewater, significantly increasing treatment costs and maintenance expenses. In contrast, wastewater poured into the filter tank is filtered and then enters the purification tank. After the wastewater is fully mixed with chemicals in the mixing tank, when the water level is above the top of the mixing tank, the wastewater falls to the outside of the mixing tank under gravity and settles between the inner wall of the purification tank and the heating pipe. The reaction proceeds statically between the heating pipe and the outer wall of the mixing tank. Simultaneously, the wastewater temperature is adjusted via the heating pipe to improve reaction efficiency and allow the wastewater to remain in the purification tank for a certain period of time. The fully treated wastewater then enters the sterilization tank for sterilization under gravity. When the water level between the second and first limiting pipes is higher than the top of the first limiting pipe, the wastewater enters the first limiting pipe and is adsorbed by the activated carbon filter components. The flow of wastewater within and between the filter tank, purification tank, and sterilization tank relies solely on gravity. The equipment does not require additional pumps or other equipment to transport the wastewater, reducing treatment costs and maintenance expenses. Attached Figure Description

[0022] Figure 1 This is a structural rendering of the present invention;

[0023] Figure 2 This is a structural diagram of the filter barrel of this utility model;

[0024] Figure 3 This is a cross-sectional view of the filter barrel of this utility model;

[0025] Figure 4 This is a cross-sectional view of the purification bucket of this utility model;

[0026] Figure 5 This is a cross-sectional view of the sterilization bucket of this utility model.

[0027] Figure label:

[0028] 1. Filter barrel; 101. Filter pipe; 102. Lifting cylinder; 103. First water outlet pipe; 104. First caster wheel; 105. Telescopic pipe; 106. Scraper; 107. First drain pipe; 2. Purification barrel; 201. Agitator motor; 202. First connecting pipe; 203. Second water outlet pipe; 204. Second caster wheel; 205. Second drain pipe; 206. Third drain pipe; 207. Agitator barrel; 208. Heating pipe; 209. First screen; 210. Agitator rod; 211. Agitator blade; 212. Second screen; 3. Sterilization barrel; 301. Second connecting pipe; 302. Activated carbon filter assembly; 303. Ultraviolet germicidal lamp; 304. First limiting pipe; 305. Fourth drain pipe; 306. Third water outlet pipe; 307. Third caster wheel; 308. Second limiting pipe. Detailed Implementation

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

[0030] Please see Figure 1-5 As shown, this utility model is a graded sewage treatment equipment, including a filter tank 1, a purification tank 2 and a sterilization tank 3. A filter tube 101 is fixedly connected to the center of the filter tank 1, and a lifting cylinder 102 is fixedly connected to the top of the filter tank 1. A purification tank 2 is arranged on one side of the outer periphery of the filter tank 1. A stirring tank 207 is fixedly connected to the center of the purification tank 2. A stirring motor 201 is fixedly connected to the center of the top of the purification tank 2. A heating tube 208 is suspended in the purification tank 2 and is located on the outer periphery of the stirring tank 207. A sterilization tank 3 is arranged on one side of the outer periphery of the purification tank 2. An activated carbon filter assembly 302 is fixedly connected to the center of the sterilization tank 3, and an ultraviolet sterilization lamp 303 is fixedly connected to the inner edge of the sterilization tank 3.

[0031] Purchase an appropriate number of purification tanks 2 as needed to connect filter tank 1 and purification tank 2, between two purification tanks 2, and between purification tank 2 and sterilization tank 3. After the wastewater is poured into filter tank 1, it passes through filter pipe 101 to filter solid particles. The filtered wastewater then enters purification tank 2 through the first outlet pipe 103. Simultaneously, the lifting cylinder 102 drives the scraper 106 to move up and down periodically to clean the inner wall of filter pipe 101 and prevent clogging. When the wastewater enters the mixing tank 207, add sufficient chemicals according to the wastewater volume, and drive the mixing blades 211 to rotate via the mixing motor 201 to fully mix the wastewater and chemicals. When the wastewater level is higher than the top of the mixing tank 207, some wastewater flows between the mixing tank 207 and the heating pipe 208, and is heated by the heating pipe 208 to reach a suitable reaction temperature. When the water level is higher than the bottom of the second outlet pipe 203, the wastewater flows into another purification tank 2 for reaction or enters the sterilization tank 3. When the wastewater enters the sterilization tank 3, it is sterilized by the ultraviolet sterilization lamp 303. When the wastewater level is higher than the first limit pipe 304, some wastewater flows into the first limit pipe 304 and is filtered by the activated carbon filter component 302 to remove odors and other substances from the wastewater. Finally, the water is discharged through the third outlet pipe 306.

[0032] Among them, such as Figure 1-3 As shown, a first water outlet pipe 103 is welded through the top of the outer periphery of the filter barrel 1, a first sewage pipe 107 is welded through the center of the bottom of the filter barrel 1, a first universal wheel 104 is rotatably locked around the bottom of the filter barrel 1, a telescopic pipe 105 is slidably locked at the bottom of the lifting cylinder 102, a scraper 106 is locked at the bottom of the telescopic pipe 105, and the outer periphery of the scraper 106 is attached to the inner wall of the filter pipe 101.

[0033] After the equipment is installed, wastewater is poured into the filter pipe 101. Solid particles are filtered out by the filter pipe 101. When the water level is higher than the bottom of the first outlet pipe 103, the wastewater flows into the purification tank 2 under the action of gravity. The lifting cylinder 102 drives the telescopic pipe 105 to extend and retract at regular intervals, which further drives the scraper 106 to move up and down to clean the filter pipe 101 and avoid clogging of the filter pipe 101. When cleaning the filter tank 1, the first drain pipe 107 is opened to discharge the sediment.

[0034] Among them, such as Figure 1 , 4As shown, a second drain pipe 205 is welded through the center of the bottom of the purification tank 2, a third drain pipe 206 is welded through the bottom edge of the purification tank 2, a second caster 204 is rotatably engaged with the bottom edge of the purification tank 2, a first connecting pipe 202 is engaged through the top of the outer circumference of the purification tank 2, a second water outlet pipe 203 is welded through the top of the outer circumference of the purification tank 2, one end of the first connecting pipe 202 is engaged with one end of the first water outlet pipe 103, and the other end of the first connecting pipe 202 is inserted through and into the heating pipe 208 and the outer circumference of the stirring tank 207. The stirring tank 2 The top of the 07 is fitted with a first screen 209, the bottom of the stirring motor 201 is fitted with a stirring rod 210, the outer circumference of the stirring rod 210 is fitted with a stirring blade 211, the stirring rod 210 is inserted through the top of the first screen 209, the stirring blade 211 is attached to the bottom of the first screen 209, the first screen 209 is located at the top of the first connecting pipe 202, the top of the outer circumference of the heating pipe 208 is fitted with a second screen 212, the outer circumference of the second screen 212 is fitted with the inner wall of the purification tank 2, and the second screen 212 is located at the bottom of the second water outlet pipe 203;

[0035] Purchase an appropriate number of purification tanks 2 as needed, and move the purification tanks 2 using the second universal caster 204. Connect them via the first outlet pipe 103 and the first connecting pipe 202, the second outlet pipe 203 and the first connecting pipe 202, and the second outlet pipe 203 and the second connecting pipe 301, thus connecting the filter tank 1 and the purification tank 2, the two purification tanks 2, and the purification tank 2 and the sterilization tank 3. After the wastewater enters the mixing tank 207 through the first connecting pipe 202, pour sufficient chemicals into the mixing tank 207 according to the wastewater volume. The stirring motor 201 drives the stirring rod 210 and stirring blades 211 to rotate, thoroughly mixing the wastewater and chemicals. When the water level is higher than the top of the mixing tank 207, the wastewater is initially screened through the first screen 209, causing a large amount of sediment to remain in the mixing tank 207. Some wastewater falls between the mixing tank 207 and the heating pipe 208 under gravity, and the wastewater is heated by the heating pipe 208 to reach the optimal reaction temperature. When the wastewater level in the purification tank 2 is higher than the bottom of the second outlet pipe 203, the wastewater is screened again through the second screen 212, causing sediment to remain in the purification tank 2. Some wastewater flows into the next purification tank 2 or sterilization tank 3 through the second outlet pipe 203. When cleaning the purification tank 2, the second drain pipe 205 and the third drain pipe 206 are opened to pour out the sediment.

[0036] Among them, such as Figure 1 , 5As shown, a second connecting pipe 301 is welded through the top of the outer periphery of the sterilization tank 3, a third water outlet pipe 306 is snapped through the bottom of the outer periphery of the sterilization tank 3, a fourth sewage pipe 305 is welded through the bottom edge of the sterilization tank 3, a third universal wheel 307 is snapped through the bottom edge of the sterilization tank 3, the second connecting pipe 301 is snapped through one end of the second water outlet pipe 203, a first limiting pipe 304 is snapped through and fixed inside the sterilization tank 3, the first limiting pipe 304 is located on the outer periphery of the activated carbon filter assembly 302, a second limiting pipe 308 is snapped through the outer periphery of the first limiting pipe 304, the second limiting pipe 308 is suspended from the top of the third water outlet pipe 306, and the third water outlet pipe 306 is inserted through and connected to the first limiting pipe 304 and the outer periphery of the activated carbon filter assembly 302;

[0037] After the equipment is installed, when sewage enters the sterilization tank 3 through the second connecting pipe 301, the sewage is sterilized by the ultraviolet sterilization lamp 303. When the water level of the sewage between the second limiting pipe 308 and the first limiting pipe 304 is higher than that of the first limiting pipe 304, some sewage flows into the first limiting pipe 304 and is filtered by the activated carbon filter component 302 to remove odors and other pollutants. Finally, the water is discharged through the third outlet pipe 306. When the sterilization tank 3 is being cleaned, the fourth drain pipe 305 is opened to discharge the remaining water in the sterilization tank 3.

[0038] The specific working principle of this utility model is as follows: Purchase a filter tank 1, a sterilization tank 3, and a suitable number of purification tanks 2 as needed. The filter tank 1, purification tank 2, and sterilization tank 3 are moved by the first universal wheel 104, the second universal wheel 204, and the third universal wheel 307, connecting the filter tank 1 and purification tank 2, the two purification tanks 2, and the purification tank 2 and sterilization tank 3. Wastewater is poured into the filter pipe 101, where solid particles are filtered out. Under gravity, the wastewater flows through the first outlet pipe. 103 and the first connecting pipe 202 flow into the mixing tank 207. The lifting cylinder 102 periodically drives the telescopic pipe 105 to extend and retract, further driving the scraper 106 to move up and down to clean the filter pipe 101 and prevent clogging. Sufficient amount of agent is poured into the mixing tank 207 according to the amount of sewage. The stirring motor 201 drives the stirring rod 210 and stirring blade 211 to rotate, fully mixing the sewage and agent. When the sewage level is higher than the top of the mixing tank 207, the sewage is initially filtered through the first screen 209. The screening process causes a large amount of sediment to remain in the mixing tank 207. Some wastewater falls between the mixing tank 207 and the heating pipe 208 under gravity, where it is heated to the optimal reaction temperature. When the wastewater level in the purification tank 2 is higher than the bottom of the second outlet pipe 203, the wastewater is screened again through the second screen 212, causing sediment to remain in the purification tank 2. Some wastewater flows through the second outlet pipe 203 into the next purification tank 2 or sterilization tank 3. When the wastewater enters the sterilization tank 3, it is treated with ultraviolet light... The germicidal lamp 303 sterilizes the sewage. When the sewage level between the second limit pipe 308 and the first limit pipe 304 is higher than that between the first limit pipe 304, some sewage flows into the first limit pipe 304 and is filtered by the activated carbon filter assembly 302 to remove odors and other pollutants. Finally, the water is discharged through the third outlet pipe 306. When cleaning the equipment, the first drain pipe 107, the second drain pipe 205, the third drain pipe 206 and the fourth drain pipe 305 are opened to pour out the sediment and residual sewage.

[0039] The above are merely preferred embodiments of the present utility model and do not limit the present utility model. Any modifications, equivalent substitutions, or improvements made to the technical solutions described in the foregoing embodiments, or to some of the technical features, shall fall within the protection scope of the present utility model.

Claims

1. A graded wastewater treatment device, comprising a filter tank (1), a purification tank (2), and a sterilization tank (3), characterized in that: A filter tube (101) is fixedly connected to the center of the filter barrel (1). A lifting cylinder (102) is fixedly connected to the top of the filter barrel (1). A purification barrel (2) is provided on one side of the outer periphery of the filter barrel (1). A stirring barrel (207) is fixedly connected to the center of the purification barrel (2). A stirring motor (201) is fixedly connected to the center of the top of the purification barrel (2). A heating tube (208) is suspended inside the purification barrel (2). The heating tube (208) is located on the outer periphery of the stirring barrel (207). A sterilization barrel (3) is provided on one side of the outer periphery of the purification barrel (2). An activated carbon filter assembly (302) is fixedly connected to the center of the sterilization barrel (3). An ultraviolet germicidal lamp (303) is fixedly connected to the edge of the sterilization barrel (3).

2. The graded sewage treatment equipment according to claim 1, characterized in that: The filter barrel (1) has a first water outlet pipe (103) welded through the top of its outer periphery, and a first sewage pipe (107) welded through the center of its bottom. The filter barrel (1) has a first universal wheel (104) rotatably attached around its bottom. The bottom of the lifting cylinder (102) is slidably attached to a telescopic pipe (105), and a scraper (106) is attached to the bottom of the telescopic pipe (105). The outer periphery of the scraper (106) is attached to the inner wall of the filter barrel (101).

3. A graded sewage treatment device according to claim 2, characterized in that: The purification tank (2) has a second drain pipe (205) welded through the center of the bottom, a third drain pipe (206) welded through the bottom edge of the purification tank (2), a second universal wheel (204) rotatably snapped onto the bottom edge of the purification tank (2), a first connecting pipe (202) snapped through the top of the outer circumference of the purification tank (2), a second water outlet pipe (203) welded through the top of the outer circumference of the purification tank (2), one end of the first connecting pipe (202) snapped onto one end of the first water outlet pipe (103), and the other end of the first connecting pipe (202) inserted through the heating pipe (208) and the outer circumference of the stirring tank (207).

4. A graded sewage treatment device according to claim 3, characterized in that: The top of the mixing tank (207) is fitted with a first screen (209), the bottom of the mixing motor (201) is fitted with a stirring rod (210), the outer circumference of the stirring rod (210) is fitted with a stirring blade (211), the stirring rod (210) is inserted through the top of the first screen (209), the stirring blade (211) is attached to the bottom of the first screen (209), the first screen (209) is located at the top of the first connecting pipe (202), the top of the outer circumference of the heating pipe (208) is fitted with a second screen (212), the outer circumference of the second screen (212) is fitted with the inner wall of the purification tank (2), and the second screen (212) is located at the bottom of the second water outlet pipe (203).

5. A graded sewage treatment device according to claim 3, characterized in that: The sterilization tank (3) has a second connecting pipe (301) welded through the top of its outer periphery, a third water outlet pipe (306) connected through the bottom of its outer periphery, a fourth sewage pipe (305) welded through the bottom edge of its sterilization tank (3), a third universal wheel (307) connected to the bottom edge of its sterilization tank (3), and the second connecting pipe (301) connected to one end of the second water outlet pipe (203).

6. A graded sewage treatment device according to claim 5, characterized in that: The sterilization tank (3) is fitted with a first limiting tube (304), which is located on the outer circumferential surface of the activated carbon filter assembly (302). A second limiting tube (308) is fitted on the outer circumferential surface of the first limiting tube (304). The second limiting tube (308) hangs from the top of the third water outlet pipe (306). The third water outlet pipe (306) is inserted through the first limiting tube (304) and the outer circumferential surface of the activated carbon filter assembly (302).

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