A combined integrated wastewater deep treatment equipment

Abstract

This utility model relates to a combined integrated wastewater deep treatment equipment, comprising: an anaerobic tank, effluent from the anaerobic tank being connected to an anoxic tank, effluent from the anoxic tank being connected to an aerobic tank, a suspended sedimentation separation structure within the aerobic tank, an aeration device below the sedimentation separation structure within the aerobic tank, supernatant from the sedimentation separation structure being connected to a vertical flow sedimentation tank, supernatant from the vertical flow sedimentation tank being connected to a gradient filtration device, and effluent from the gradient filtration device being connected to a clear water tank. The beneficial effects are: the proportion and sequence of anaerobic, anoxic, and aerobic processes can be adjusted according to different usage scenarios; the process is arranged in the order of anaerobic, anoxic, and aerobic, mainly for simultaneous nitrogen and phosphorus removal; the biological treatment zone consists of anaerobic + anoxic + aerobic; and the sedimentation zone and gradient filtration are connected in series at the end of the biological treatment zone, highly integrating biological and deep treatment processes, resulting in equipment with high treatment efficiency, high flexibility, strong adaptability, low operation and maintenance difficulty, and low operating energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a combined integrated wastewater deep treatment device. Background Technology

[0002] With rapid global economic development and continuous population growth, water scarcity and water pollution are becoming increasingly serious problems. Small-scale wastewater discharge sources, such as small communities, township enterprises, and tourist attractions, cannot be directly connected to large-scale wastewater treatment systems. This makes small-scale wastewater treatment equipment crucial for meeting the treatment needs of these dispersed wastewater sources. In China, with the advancement of the rural revitalization strategy, the demand for small-scale wastewater treatment equipment in rural areas is enormous. In cities, many older residential areas have aging sewage pipe networks, making it difficult to connect to large-scale urban wastewater treatment systems. Small-scale wastewater treatment equipment can serve as a temporary or long-term solution.

[0003] Traditional small-scale wastewater treatment equipment currently faces the following problems:

[0004] 1) With social development, the improvement of wastewater treatment standards has become an important issue for sustainable development. Traditional equipment has simple treatment processes, and the effluent quality is difficult to meet the upgraded effluent standards.

[0005] 2) Small-scale sewage treatment facilities have relatively high energy consumption: due to their small treatment scale, the energy consumption of sewage lift pumps and aeration equipment accounts for a large proportion.

[0006] 3) The unit construction cost of small-scale sewage treatment facilities is relatively high: due to their small scale, they cannot achieve the cost reduction benefits brought about by large-scale production;

[0007] 4) The locations of small-scale sewage treatment facilities are relatively scattered, which leads to additional costs such as transportation and installation costs during the construction process. In some remote areas, equipment maintenance may not be timely, increasing the risk of failure and further increasing operating costs.

[0008] 5) The operation and management of small-scale sewage treatment facilities are relatively complex and costly: due to the lack of economies of scale, the management costs of operators are higher per ton of sewage treated.

[0009] 6) High equipment maintenance and replacement costs for small-scale wastewater treatment facilities: Due to the small number of devices used, there is a relatively limited supply of spare parts for small-scale wastewater treatment equipment on the market, which makes the price of spare parts higher. Utility Model Content

[0010] The technical problem to be solved by this utility model is to provide a combined integrated wastewater deep treatment equipment with high processing efficiency, high flexibility, strong adaptability, low operation and maintenance difficulty, and low operating energy consumption, so as to solve the industry pain points of decentralized wastewater treatment.

[0011] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0012] A combined integrated wastewater deep treatment device includes: an anaerobic tank, effluent from the anaerobic tank being connected to an anoxic tank, effluent from the anoxic tank being connected to an aerobic tank, nitrified liquid from the aerobic tank being returned to the anoxic tank, a suspended sedimentation separation structure being installed in the aerobic tank, an aeration device being installed below the sedimentation separation structure in the aerobic tank, supernatant from the sedimentation separation structure being connected to a vertical flow sedimentation tank, supernatant from the vertical flow sedimentation tank being connected to a gradient filtration device, some of the settled sludge from the vertical flow sedimentation tank being returned to the anaerobic tank, and effluent from the gradient filtration device being connected to a clear water tank.

[0013] Based on the above technical solution, the present invention can be further improved as follows.

[0014] Furthermore, an air mixing device is installed at the bottom of the anoxic pool.

[0015] Furthermore, the sedimentation separation structure includes: two suspended outer partitions arranged side-by-side in the aerobic tank along the water flow direction, with both ends of the outer partitions fixedly connected to the tank wall of the aerobic tank, and the upper end of the outer partitions below the liquid level. Between the two outer partitions, two suspended inner partitions are arranged side-by-side along the water flow direction, with both ends of the inner partitions fixedly connected to the tank wall of the aerobic tank, the lower end of the inner partitions located in the middle area of ​​the outer partitions, and the upper end of the inner partitions above the liquid level. Between the two outer partitions, below the inner partitions, multiple upward-pointing triangular inclined plates are arranged. There is a gap between the outer and inner partitions on the same side, forming a sedimentation separation zone between the two inner partitions. Above the sedimentation separation zone between the two inner partitions, a suspended outlet channel is provided along the water flow direction, with both ends of the outlet channel fixedly connected to the tank wall of the aerobic tank.

[0016] Furthermore, the lower end of the inner partition is bent inward at a certain angle.

[0017] Furthermore, the vertical flow sedimentation tank has a central guide tube distributed vertically. The upper end of the central guide tube is above the liquid level, and the lower end of the central guide tube is below the liquid level. The supernatant in the aerobic tank is sent into the central guide tube through a pipe. An umbrella-shaped reflector is provided at the lower outlet of the central guide tube. A sawtooth / triangular overflow weir fixed to the tank wall is provided around the central guide tube in the vertical flow sedimentation tank. The supernatant in the sawtooth / triangular overflow weir flows into the gradient filtration device.

[0018] Furthermore, the bottom of the vertical flow sedimentation tank is equipped with an inverted cone-shaped sludge hopper, and the bottom of the inverted cone-shaped sludge hopper is connected to a sludge pump or a gravity sludge discharge valve.

[0019] Furthermore, the gradient filtration device includes: a multi-layered stacked square / rectangular frame, the frame being placed inside the outer tank, each layer of the frame having an independent filter box, the top of the filter box being an open inlet, the bottom of the filter box being a perforated support plate, each filter box being filled with a filter media layer, the filter media layers filled in all the filter boxes distributed from top to bottom having different particle sizes and densities, and the filtration accuracy increasing layer by layer, and each filter box having a filter screen covering the filter media layer above and below.

[0020] Furthermore, each filter box is equipped with a high-pressure water gun on its side.

[0021] Furthermore, biological packing material is added to the aerobic tank.

[0022] Furthermore, the anaerobic tank, anoxic tank, aerobic tank, vertical flow sedimentation tank, gradient filtration device, and clear water tank are connected in sequence by gravity flow.

[0023] The beneficial effects of this utility model are as follows:

[0024] 1) Adjust the proportion and sequence of anaerobic, anoxic, and aerobic processes according to different usage scenarios. The process is arranged in the order of anaerobic, anoxic, and aerobic, mainly for simultaneous nitrogen and phosphorus removal. The biological treatment area consists of anaerobic + anoxic + aerobic processes. The sedimentation area and gradient filtration are connected in series after the biological treatment area. The biological treatment process and the deep treatment process are highly integrated, forming the characteristics of high treatment efficiency, high flexibility, strong adaptability, low operation and maintenance difficulty, and low operating energy consumption. The effluent quality meets the effluent standards after the upgrade.

[0025] 2) The aeration device in the aerobic tank can not only supply oxygen, but also lift the mixed liquid upward. Most of the bubbles burst during the upward process, thus providing oxygen to the mixed liquid. At the same time, it can achieve a thorough stirring effect. According to the characteristics of solid, liquid and gas, when the gas-solid-liquid mixture is in a state of rising, due to the density difference, the solid sinks faster and the gas rises faster. The special structure of the sedimentation separation structure in the aerobic tank makes the solid-liquid-gas separation efficiency higher. The densest solid settles back to the bottom of the aerobic tank, and some solids reach dynamic equilibrium and form a suspended sludge layer in the middle of the separation zone. At the same time, some suspended matter can be intercepted. The clarified liquid continues to rise and is finally sent to the vertical flow sedimentation tank. The sedimentation separation structure can complete the basic solid-liquid separation function, which is conducive to water quality improvement and reduces the operation and maintenance cost of the secondary sedimentation tank.

[0026] 3) Vertical flow sedimentation tanks have a vertical design that saves space and is suitable for integration into integrated equipment. They have no complex mechanical parts, have a low failure rate, and have a high degree of automation in sludge discharge operation, making them suitable for unattended operation. The sludge is naturally concentrated in the tank, with a low water content, which reduces the energy consumption for subsequent dewatering. It relies solely on gravity settling and does not require additional power. The hydraulic retention time is short, resulting in high treatment efficiency.

[0027] 4) Different water qualities can be treated in a targeted manner by adjusting the density, particle size and filling order of the filter media in the gradient filtration device. In the absence of backwashing conditions, maintenance can be carried out by lifting the frame and cleaning manually. It can also be equipped with an air washing, water washing or air-water combination backwashing device to automatically and intelligently wash the filter media, reducing the difficulty and cost of manual maintenance.

[0028] 5) The area of ​​the sedimentation and separation structure in the aerobic tank can be adjusted according to the actual influent volume and water quality, increasing or decreasing the area ratio of the separation zone, without affecting the aeration and biochemical reaction effect of the bottom aerobic zone.

[0029] 6) By adding biological packing material to the aerobic tank, the biological concentration in the aerobic tank is increased, and the volumetric load of the biochemical zone is improved, thereby improving the overall treatment efficiency of the equipment without changing the equipment volume. Attached Figure Description

[0030] Figure 1 This is a structural diagram of the combined integrated wastewater deep treatment equipment of this utility model;

[0031] Figure 2 for Figure 1 Cross-sectional view at point AA;

[0032] Figure 3 for Figure 1 Cross-sectional view at point BB.

[0033] The attached diagram lists the components represented by each number as follows:

[0034] 1. Anaerobic tank; 2. Anoxic tank; 210. Air mixing device; 3. Aerobic tank; 310. Sedimentation separation structure; 311. External partition; 312. Internal partition; 313. Sedimentation separation zone; 314. Effluent channel; 315. Triangular inclined plate; 320. Aeration device; 4. Vertical flow sedimentation tank; 410. Central guide tube; 420. Pipeline; 430. Sawtooth / triangular overflow weir; 440. Umbrella-shaped reflector; 450. Inverted cone-shaped sludge hopper; 5. Gradient filtration device; 6. Clear water tank. Detailed Implementation

[0035] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0036] Example 1

[0037] like Figures 1-3 As shown, a combined integrated wastewater deep treatment device includes:

[0038] The effluent from the anaerobic tank 1 is connected to the anoxic tank 2, and the effluent from the anoxic tank 2 is connected to the aerobic tank 3. The nitrified liquid in the aerobic tank 3 is returned to the anoxic tank 2. The aerobic tank 3 is equipped with a suspended sedimentation separation structure 310. An aeration device 320 is installed below the sedimentation separation structure 310 in the aerobic tank 3. The supernatant in the sedimentation separation structure 310 is connected to the vertical flow sedimentation tank 4. The supernatant in the vertical flow sedimentation tank 4 is connected to the gradient filtration device 5. Part of the settled sludge in the vertical flow sedimentation tank 4 is returned to the anaerobic tank 1. The effluent from the gradient filtration device 5 is connected to the clear water tank 6.

[0039] In anaerobic tank 1, dissolved and easily degradable organic matter in the wastewater combines with polyphosphate-accumulating bacteria in the returned sludge, absorbing organic matter and releasing phosphorus (P) at the same time, preparing for the full absorption of total phosphorus (TP) in the subsequent aerobic stage, ensuring a high TP removal efficiency in the biological stage. Wastewater and returned nitrified liquid are completely mixed in anoxic tank 2 and fully undergo denitrification, thereby achieving the removal of total nitrogen from the wastewater. In an aerobic environment, aerobic microorganisms in the wastewater inorganicize some of the organic matter in the wastewater through processes such as oxidation, reduction, and synthesis, while some of the organic matter is synthesized into cell material of aerobic microorganisms.

[0040] The aeration device 320 in the aerobic tank 3 can supply oxygen and also lift the mixed liquid upward. Most of the bubbles break during the upward process, thus providing oxygen to the mixed liquid. At the same time, it can achieve a thorough stirring effect. According to the characteristics of solid, liquid and gas fluids, when the gas-solid-liquid mixture is in a rising state, due to the density difference, the solid sinks faster and the gas rises faster. The special structure of the sedimentation separation structure 310 in the aerobic tank 3 makes the solid-liquid-gas separation efficiency higher. The densest solid settles back to the bottom of the aerobic tank 3, and some solids reach dynamic equilibrium and form a suspended sludge layer in the middle of the separation zone. At the same time, it can intercept some suspended matter. The clarified liquid continues to rise and is finally sent to the vertical flow sedimentation tank 4. The sedimentation separation structure 310 can complete the basic solid-liquid separation function, which is conducive to water quality improvement and reduces the operation and maintenance cost of the secondary sedimentation tank.

[0041] The vertical flow sedimentation tank 4 is a vertical solid-liquid separation device. Its working principle is based on gravity sedimentation and rising water flow dynamics. Wastewater enters the tank from the bottom central guide tube 410 and flows upward through the central guide tube 410. The flow velocity gradually decreases, and suspended particles settle downward under the action of gravity. Meanwhile, the clear water rises along the perimeter of the tank and is discharged into the gradient filtration device 5. The settled sludge accumulates at the bottom of the tank and is discharged periodically. The vertical design of the vertical flow sedimentation tank 4 saves space and is suitable for integration into an integrated device. It has no complex mechanical parts, has a low failure rate, and has a high degree of automation in sludge discharge operation, making it suitable for unattended operation. The sludge is naturally concentrated in the tank with a low water content, reducing the energy consumption for subsequent dewatering. It relies solely on gravity sedimentation and does not require additional power. The hydraulic retention time is short, resulting in high treatment efficiency.

[0042] Water flows from top to bottom through the gradient filtration device 5, using filter media layers of different particle sizes and densities for physical interception. Large suspended solids are intercepted by the upper coarse filter media layer, while fine particles are adsorbed or intercepted by the lower fine filter media layer. The synergistic effect of multiple filter media can remove more than 80% of suspended solids, colloids and some organic matter in the water without the need for chemical agents, relying mainly on physical filtration.

[0043] The proportion and sequence of anaerobic, anoxic, and aerobic processes are adjusted according to different usage scenarios. The process is arranged in the order of anaerobic, anoxic, and aerobic, and is mainly used for simultaneous nitrogen and phosphorus removal. The biochemical treatment zone consists of anaerobic + anoxic + aerobic processes. The sedimentation zone and gradient filtration are connected in series after the biochemical treatment zone. The biochemical process and the deep treatment process are highly integrated, forming a simple and efficient equipment.

[0044] Example 2

[0045] like Figure 1 As shown, this embodiment is a further improvement on embodiment 1, as detailed below:

[0046] An anoxic tank 2 is equipped with an air stirring device 210 at the bottom of the tank. The air stirring device 210 introduces air into the anoxic tank 2 to achieve a thorough stirring of the mixture.

[0047] Example 3

[0048] like Figure 1 , Figure 2 As shown, this embodiment is a further improvement on embodiment 1 or 2, as detailed below:

[0049] The sedimentation separation structure 310 includes: two outer partitions 311, two inner partitions 312, and an outlet channel 314. The two outer partitions 311 are arranged inside the aerobic tank 3, and are distributed side by side along the water flow direction and suspended. "Suspended" means that there is a gap between the lower end of the outer partition 311 and the bottom of the aerobic tank 3. Both ends of the outer partitions 311 are fixedly connected to the tank wall of the aerobic tank 3. Figure 1 Taking the shown perspective as an example, the two ends of the outer partition 311 are fixedly connected to the left and right walls of the aerobic tank 3, respectively. The upper end of the outer partition 311 is below the liquid level. Two inner partitions 312 are arranged side-by-side and suspended between the two outer partitions 311 along the water flow direction. Similarly, "suspended" means that there is a gap between the lower end of the inner partition 312 and the bottom of the aerobic tank 3. The two ends of the inner partition 312 are fixedly connected to the walls of the aerobic tank 3, respectively. Figure 1Taking the shown perspective as an example, the two ends of the inner partition 312 are fixedly connected to the left and right walls of the aerobic tank 3, respectively. The lower end of the inner partition 312 is located in the middle area of ​​the outer partition 311, and the upper end of the inner partition 312 is above the liquid level. Multiple upward-pointing triangular inclined plates 315 are arranged between the two outer partitions 311 below the inner partition 312. There is a gap between the outer partitions 311 and the inner partitions 312 on the same side. A sedimentation separation zone 313 is formed between the two inner partitions 312. A suspended outlet channel 314 is provided above the sedimentation separation zone 313 between the two inner partitions 312 along the water flow direction. The two ends of the outlet channel 314 are fixedly connected to the walls of the aerobic tank 3, respectively. Figure 1 Taking the perspective shown as an example, the two ends of the outlet channel 314 are fixedly connected to the left and right walls of the aerobic pool 3, respectively.

[0050] During the aeration process, the mixed liquid containing air bubbles first enters the space between the two outer partitions 311 from below, and then enters the space between the two inner partitions 312 after passing through the triangular inclined plate 315. When the mixed liquid floats to the point where gravity and buoyancy reach equilibrium, a suspended sludge layer is formed, which can intercept suspended matter in the subsequent mixed liquid. After the suspended matter and sludge settle to the triangular inclined plate 315, they fall along the triangular inclined plate 315 into the bottom of the aerobic tank 3. Under the action of aeration and stirring, they are mixed evenly with the mixed liquid, which has a certain reflux effect. The clarified mixed liquid continues to rise, and the effluent reaches the top of the separation zone and flows into the effluent channel 314. Then, the effluent channel 314 is connected to the vertical flow sedimentation tank 4.

[0051] Furthermore, the lower end of the inner baffle 312 is bent inward at a certain angle to form a flow guide.

[0052] Example 4

[0053] like Figure 1 , Figure 3 As shown, this embodiment is a further improvement on any one of embodiments 1 to 3, as detailed below:

[0054] The vertical flow sedimentation tank 4 has a central guide tube 410 distributed vertically. The upper end of the central guide tube 410 is above the liquid level, and the lower end is below the liquid level. The supernatant in the aerobic tank 3 is sent into the central guide tube 410 through a pipe 420. Specifically, the supernatant in the effluent channel 314 is sent into the central guide tube 410 through a pipe 420. An umbrella-shaped reflector 440 is provided at the lower outlet of the central guide tube 410. The vertical flow sedimentation tank 4 has an inner ring... A sawtooth / triangular overflow weir 430 fixed to the pool wall is provided around the central guide cylinder 410. The supernatant in the sawtooth / triangular overflow weir 430 flows into the gradient filter device 5. The water from the front outlet channel 314 enters the central guide cylinder 410 from the side wall through the pipe. The umbrella-shaped reflector 440 at the bottom of the central guide cylinder 410 disperses the water flow in all directions, reduces the flow velocity, and prevents short-circuiting. The sawtooth / triangular overflow weir 430 collects the supernatant evenly and flows into the gradient filter device 5.

[0055] The vertical flow sedimentation tank 4 adopts a square vertical tank structure. The bottom of the vertical flow sedimentation tank 4 is equipped with an inverted cone-shaped sludge hopper 450, which facilitates sludge concentration and collection. The inverted cone-shaped sludge hopper 450 can naturally concentrate sludge, reduce the volume of subsequent sludge treatment, and reduce disposal costs. The bottom of the inverted cone-shaped sludge hopper 450 is connected to a sludge pump or a gravity sludge discharge valve, which facilitates the periodic discharge of concentrated sludge.

[0056] Example 5

[0057] like Figure 1 , Figure 3 As shown, this embodiment is a further improvement on any one of embodiments 1 to 4, as detailed below:

[0058] The gradient filtration device 5 includes: a multi-layered, stacked square / rectangular frame, the number of layers of which can be expanded according to needs. The frame can be made of stainless steel or corrosion-resistant engineering plastic. The frame is placed inside the outer tank. Each layer of the frame has an independent filter box with uniform size. The top of the filter box is an open inlet, and the bottom of the filter box is a hollow support plate. Each filter box is filled with a filter media layer. Water flows from top to bottom and penetrates layer by layer. The filter media layers filled in all the filter boxes distributed from top to bottom have different particle sizes and densities, and the filtration accuracy increases layer by layer, forming a "coarse-fine-fine" gradient filtration structure. Each filter box is covered with a filter screen above and below the filter media layer. The filter screen can be made of stainless steel to prevent filter media loss while allowing water to pass through. A vertical slide rail is provided between the frame and the outer tank. The frame can be lifted vertically from the bottom up along the vertical slide rail (similar to a drawer-type structure). Each filter media layer adopts a liftable box structure for easy removal and replacement of filter media and daily maintenance. Rollers and slide rails are provided between the filter box and the frame. Sealing strips are provided on the side of the filter box.

[0059] Furthermore, each filter box is equipped with a high-pressure water gun on its side. The high-pressure water gun can be used with an air washing, water washing, or air-water combination backwashing device to perform regular in-situ backwashing, remove trapped impurities, restore filtration capacity, and achieve low backwashing energy consumption, long filter media life, automated backwashing operation, low daily management cost, and reduced disassembly frequency.

[0060] Shutdown maintenance mode: When the filter media needs to be removed for replacement or cleaning, close the inlet valve, pull the target filter box vertically from the bottom to the maintenance height, open the top cover of the filter box, pour out the old filter media, rinse the filter screen and fill with new filter media.

[0061] Backwash mode: Periodically turn on the external water pump to inject high-pressure water in reverse, breaking up the caked filter media and discharging the wastewater.

[0062] Example 6

[0063] like Figure 1 As shown, this embodiment is a further improvement on any one of embodiments 1 to 5, as detailed below:

[0064] Adding biological packing material to aerobic tank 3 increases the biological concentration in the aerobic zone and improves the volumetric load of the biochemical zone, thereby improving the overall treatment efficiency of the equipment without changing the equipment volume.

[0065] Example 7

[0066] like Figure 1 As shown, this embodiment is a further improvement on any one of embodiments 1 to 6, as detailed below:

[0067] Anaerobic tank 1, anoxic tank 2, aerobic tank 3, vertical flow sedimentation tank 4, gradient filtration device 5, and clear water tank 6 are connected together to form an integrated structure. Anaerobic tank 1, anoxic tank 2, aerobic tank 3, vertical flow sedimentation tank 4, gradient filtration device 5, and clear water tank 6 are connected sequentially by gravity flow.

[0068] The clear water tank 6 is located on one side of the vertical flow sedimentation tank 4 and the gradient filtration device 5. The clear water tank 6 is mainly used to store the final effluent from the equipment. When the water quality is good, the effluent from the vertical flow sedimentation tank 4 can also directly enter the clear water tank 6. If further treatment is required, it enters the gradient filtration device 5. After deep filtration, it enters the clear water tank 6. The water storage function of the clear water tank 6 can provide a water source for backwashing and can also meet the needs of subsequent effluent improvement.

[0069] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A combined integrated wastewater deep treatment equipment, characterized in that, include: The anaerobic tank (1) is connected to the anoxic tank (2), the effluent from the anoxic tank (2) is connected to the aerobic tank (3), the nitrified liquid in the aerobic tank (3) is returned to the anoxic tank (2), the aerobic tank (3) is provided with a suspended sedimentation separation structure (310), the aerobic tank (3) is provided with an aeration device (320) below the sedimentation separation structure (310), the supernatant in the sedimentation separation structure (310) is connected to the vertical flow sedimentation tank (4), the supernatant in the vertical flow sedimentation tank (4) is connected to the gradient filtration device (5), part of the settled sludge in the vertical flow sedimentation tank (4) is returned to the anaerobic tank (1), and the effluent from the gradient filtration device (5) is connected to the clear water tank (6).

2. The combined integrated wastewater deep treatment equipment according to claim 1, characterized in that, The anoxic pool (2) is equipped with an air stirring device (210) at the bottom of the pool.

3. The combined integrated wastewater deep treatment equipment according to claim 1, characterized in that, The sedimentation separation structure (310) includes: two suspended outer partitions (311) arranged side-by-side in the aerobic tank (3) along the water flow direction, with both ends of the outer partitions (311) fixedly connected to the tank wall of the aerobic tank (3), the upper end of the outer partitions (311) being below the liquid level line, and two suspended inner partitions (312) arranged side-by-side between the two outer partitions (311) along the water flow direction, with both ends of the inner partitions (312) fixedly connected to the tank wall of the aerobic tank (3), and the lower end of the inner partitions (312) being located in the middle of the outer partitions (311). In the area, the upper end of the inner partition (312) is above the liquid level. Between the two outer partitions (311), a number of triangular inclined plates (315) with their tips pointing upwards are arranged below the inner partition (312). There is a gap between the outer partition (311) and the inner partition (312) on the same side. A sedimentation separation zone (313) is formed between the two inner partitions (312). A suspended outlet channel (314) is provided above the sedimentation separation zone (313) between the two inner partitions (312) along the water flow direction. The two ends of the outlet channel (314) are fixedly connected to the pool wall of the aerobic pool (3).

4. The combined integrated wastewater deep treatment equipment according to claim 3, characterized in that, The lower end of the inner partition (312) is bent inward at a certain angle.

5. The combined integrated wastewater deep treatment equipment according to claim 1, characterized in that, The vertical flow sedimentation tank (4) has a central guide tube (410) distributed vertically. The upper end of the central guide tube (410) is above the liquid level line, and the lower end of the central guide tube (410) is below the liquid level line. The supernatant in the aerobic tank (3) is sent into the central guide tube (410) through the pipe (420). An umbrella-shaped reflector plate (440) is provided at the lower outlet of the central guide tube (410). A sawtooth / triangular overflow weir (430) fixed to the tank wall is provided around the central guide tube (410) in the vertical flow sedimentation tank (4). The supernatant in the sawtooth / triangular overflow weir (430) flows into the gradient filtration device (5).

6. The combined integrated wastewater deep treatment equipment according to claim 5, characterized in that, The bottom of the vertical flow sedimentation tank (4) is provided with an inverted conical sludge hopper (450), and the bottom of the inverted conical sludge hopper (450) is connected to a sludge pump or a gravity sludge discharge valve.

7. The combined integrated wastewater deep treatment equipment according to claim 1, characterized in that, The gradient filtration device (5) includes: a multi-layered square / rectangular frame, the frame being placed inside the outer pool, each layer of the frame having an independent filter box, the top of the filter box being an open inlet, the bottom of the filter box being a hollow support plate, each filter box being filled with a filter media layer, the filter media layers filled in all the filter boxes distributed from top to bottom having different particle sizes and densities, and the filtration accuracy increasing layer by layer, and each filter box having a filter screen covering the filter media layer above and below.

8. The combined integrated wastewater deep treatment equipment according to claim 7, characterized in that, Each filter box is equipped with a high-pressure water gun on its side.

9. A combined integrated wastewater deep treatment equipment according to claim 1, characterized in that, Biological packing material is added to the aerobic tank (3).

10. A combined integrated wastewater deep treatment device according to any one of claims 1 to 8, characterized in that, The anaerobic tank (1), anoxic tank (2), aerobic tank (3), vertical flow sedimentation tank (4), gradient filtration device (5) and clear water tank (6) are connected in sequence by gravity flow.

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