Recycled water multi-stage filtering treatment device

Abstract

The utility model discloses a multistage filtering treatment device for reclaimed water, which comprises a box body, a water inlet diverter valve, a gas inlet diverter valve, an aeration device, a gas-liquid mixer and a bottom cleaning component, a T-shaped vertical partition plate is arranged in the box body and divides the box body into an aeration area, a settling area and a filtering area, and the bottom cleaning component is arranged in the box body. The aeration area is communicated with the settling area, the filtering area is communicated with the settling area, a water inlet and an air inlet are formed in the upper part of the aeration area, and a water outlet is formed in the filtering area; the water inlet diverter valve is arranged on a water inlet of the aeration area, the water inlet diverter valve is provided with a first water outlet and a second water outlet, and the first water outlet is communicated with the inside of the aeration area; and the air inlet diverter valve is arranged on the air inlet of the aeration area. The device can treat reclaimed water, effectively clean the bottom of the aeration area, prevent long-term accumulation of sediments, improve sewage treatment efficiency and reduce manual maintenance cost, and is convenient to use.

Description

Technical Field

[0001] This utility model relates to a multi-stage filtration treatment device for reclaimed water, belonging to the field of wastewater treatment technology. Background Technology

[0002] Reclaimed water treatment technologies typically include various methods such as physical, chemical, and biological treatments to remove suspended solids, pollutants, and microorganisms from water, thereby achieving reuse standards. In wastewater treatment processes, a combination of processes such as aeration, sedimentation, and filtration is often used to improve wastewater purification efficiency.

[0003] A search of existing technologies revealed a Chinese patent with publication number CN219709315U that discloses a wastewater treatment device. This device uses an aeration zone, a sedimentation zone, and a filtration zone to perform graded treatment of wastewater. However, during use, it was found that sludge and impurities easily accumulate at the bottom of the aeration and sedimentation zones, and the lack of an effective cleaning structure leads to long-term sediment buildup, affecting the wastewater treatment effect and increasing the difficulty of equipment maintenance and operating costs. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a multi-stage filtration treatment device for reclaimed water. It can treat reclaimed water and effectively clean the bottom of the aeration zone, prevent long-term accumulation of sediment, and improve the efficiency of sewage treatment.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a multi-stage filtration treatment device for reclaimed water, comprising:

[0006] The box body is equipped with a T-shaped vertical partition plate, which divides the box body into an aeration zone, a sedimentation zone and a filtration zone. The aeration zone and the sedimentation zone are connected to each other, and the filtration zone and the sedimentation zone are also connected to each other. The aeration zone is equipped with a water inlet and an air inlet at the top, and the filtration zone is equipped with a water outlet.

[0007] An inlet diversion valve is installed on the inlet of the aeration zone. The inlet diversion valve has a first outlet and a second outlet. The first outlet is connected to the aeration zone.

[0008] An air intake diversion valve is installed on the air inlet of the aeration zone, and the air intake diversion valve is provided with a first air outlet and a second air outlet;

[0009] An aeration device is installed at the bottom of the aeration zone and is connected to the first air outlet of the air inlet diversion valve.

[0010] A gas-liquid mixer is fixedly installed on the upper part of the housing. The gas-liquid mixer is provided with a liquid inlet, a gas inlet and a mixing outlet. The liquid inlet is connected to the second water outlet of the inlet diversion valve and the gas inlet is connected to the second gas outlet of the inlet diversion valve.

[0011] A bottom cleaning component is provided, which is located at the bottom of the aeration zone of the tank. The bottom cleaning component is provided with a gas-liquid mixing inlet, which is connected to the mixing outlet of the gas-liquid mixer. The bottom cleaning component is provided with multiple water outlet holes.

[0012] Furthermore, to prevent water from overflowing from the filtration zone, a second drain hole is provided on the upper part of the side wall of the filtration zone, and the height of the second drain hole is greater than the height of the water outlet.

[0013] Furthermore, the multi-stage filtration treatment device for reclaimed water also includes at least one check valve, which is installed on the connecting pipe between the mixing outlet of the gas-liquid mixer and the gas-liquid mixing inlet of the bottom cleaning assembly.

[0014] Furthermore, an overflow guiding and connecting component is provided between the aeration zone and the sedimentation zone, the overflow guiding and connecting component comprising:

[0015] A flow guide frame is provided on the aeration zone, located between the aeration zone and the sedimentation zone, and the flow guide frame is provided with a flow guide trough;

[0016] A flow guide baffle is disposed on the outer edge of the flow guide channel, and the flow guide baffle is provided with a plurality of serrated overflow ports;

[0017] An overflow connection pipe is provided, with one end connected to the bottom of the guide channel and the other end extending into the sedimentation zone.

[0018] Furthermore, to facilitate manual maintenance, the multi-stage filtration treatment device for reclaimed water also includes a maintenance ladder assembly, which comprises:

[0019] An inclined ladder is provided along the side wall of the box body;

[0020] An operating platform is connected to the top of the inclined ladder.

[0021] Furthermore, a specific structure of an aeration device is provided, the aeration device comprising:

[0022] An aeration main pipe is horizontally positioned at the bottom of the aeration zone. The aeration main pipe is connected to the first air outlet of the air inlet diverter valve, and the end of the aeration main pipe is a closed end.

[0023] At least one aeration disc is installed on the main aeration pipe and is connected to the main aeration pipe.

[0024] Furthermore, the bottom cleaning assembly includes:

[0025] A flushing distribution pipe is horizontally installed at the bottom of the aeration zone, and the water outlet is installed on the flushing distribution pipe.

[0026] Furthermore, the multi-stage filtration treatment device for reclaimed water also includes a sedimentation zone flushing assembly, which comprises:

[0027] A water inlet connecting pipe is provided at the bottom of the aeration zone. One end of the water inlet connecting pipe is connected to the bottom cleaning component, and the other end passes through the T-shaped vertical dividing plate.

[0028] A connecting pipe is disposed in the sedimentation zone, one end of which is connected to the water inlet pipe, and the other end is provided with at least one connection port.

[0029] At least one water outlet pipe is installed at the connection port of the connecting pipe, the water outlet pipe is provided with multiple spray holes, and the end of the water outlet pipe is a closed end.

[0030] Furthermore, the multi-stage filtration treatment device for reclaimed water also includes at least one support clamp, which is installed on the inner wall of the aeration zone of the tank. The support clamp is provided with a fixing ring, which is sleeved on the connecting pipe between the gas-liquid mixing inlet of the bottom cleaning component and the mixing outlet of the gas-liquid mixer.

[0031] Furthermore, the bottom of the filtration area of ​​the housing is provided with multiple filter caps, which are connected to the water outlet.

[0032] By adopting the above technical solution, this utility model has the following beneficial effects:

[0033] In this invention, a T-shaped vertical partition divides the tank into an aeration zone, a sedimentation zone, and a filtration zone. During normal use, reclaimed water enters the aeration zone through the inlet of the aeration zone, then flows into the aeration zone through the first outlet of the inlet diversion valve. There, it comes into full contact with the gas entering from the air inlet and being introduced into the aeration device through the first outlet of the air diversion valve, forming bubbles, increasing the dissolved oxygen content in the water, and enhancing the pollutant degradation efficiency. Subsequently, the water flows into the sedimentation zone, where some suspended particles settle. The upper layer of water then enters the filtration zone and is finally discharged through the outlet. After prolonged use, sludge and impurities may accumulate at the bottom of the aeration and sedimentation zones, affecting the treatment effect. In this case, the inlet diversion valve can be controlled to connect the second outlet to the inlet, allowing cleaning water to flow into the aeration zone's inlet. Simultaneously, the air diversion valve can be switched to connect the second outlet to the inlet, introducing compressed gas. The compressed gas and cleaning water enter the gas-liquid mixer, where they mix to form a gas-liquid mixture, which is then transported to the bottom cleaning assembly. The mixed fluid is sprayed through the outlet holes of the bottom cleaning component to flush the bottom of the aeration zone and sedimentation zone, thereby removing attached sediment, preventing sludge accumulation, and improving the cleaning efficiency and operational stability of the equipment.

[0034] In addition, a second drain hole is provided on the upper side wall of the filtration zone to overflow and drain water when there is excessive water, preventing abnormal rise in the water level of the filtration zone. A one-way valve is added between the mixing outlet of the gas-liquid mixer and the bottom cleaning component to prevent backflow of gas and liquid. The overflow guiding connection component between the aeration zone and the sedimentation zone adopts a combination of guide trough frame, guide baffle and overflow connection pipe, which can guide the water flow to a stable transition, avoid disturbance to the sedimentation zone and improve sedimentation efficiency. In addition, the installation of the maintenance ladder component allows operators to easily inspect and maintain the equipment, improving the service life of the equipment and the convenience of maintenance.

[0035] In summary, this invention achieves wastewater treatment in a confined space while ensuring long-term stable operation, thus improving wastewater treatment efficiency and possessing high practical value. Attached Figure Description

[0036] Figure 1 This is a three-dimensional structural diagram of the multi-stage filtration treatment device for reclaimed water according to this utility model. Figure 1 ;

[0037] Figure 2 This is a front view of the multi-stage filtration treatment device for reclaimed water according to this utility model;

[0038] Figure 3 This is a three-dimensional structural diagram of the multi-stage filtration treatment device for reclaimed water according to this utility model. Figure 2 ;

[0039] Figure 4 This is a three-dimensional structural diagram of the multi-stage filtration treatment device for reclaimed water according to this utility model. Figure 3. Detailed Implementation

[0040] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0041] like Figure 1-4 As shown, a multi-stage filtration treatment device for reclaimed water includes:

[0042] Box 1, Box 1 is provided with T-shaped vertical partition plate 2, T-shaped vertical partition plate 2 divides Box 1 into aeration zone 3, sedimentation zone 5 and filtration zone 4. Aeration zone 3 and sedimentation zone 5 are connected to each other, filtration zone 4 and sedimentation zone 5 are connected to each other. Aeration zone 3 is provided with water inlet 6 and air inlet 7 at the top, and filtration zone 4 is provided with water outlet 41.

[0043] The inlet diversion valve 8 is installed on the inlet 6 of the aeration zone 3. The inlet diversion valve 8 has a first outlet 81 and a second outlet 82. The first outlet 81 is connected to the aeration zone 3.

[0044] Air intake diversion valve 9 is installed on the air intake port 7 of the aeration zone 3. The air intake diversion valve 9 is provided with a first air outlet 91 and a second air outlet 92.

[0045] An aeration device is installed at the bottom of the aeration zone 3 and is connected to the first air outlet 91 of the air inlet diversion valve 9.

[0046] Gas-liquid mixer 11 is fixedly installed on the upper part of the housing 1. Gas-liquid mixer 11 is provided with liquid inlet 111, gas inlet 112 and mixing outlet 113. Liquid inlet 111 is connected to the second water outlet 82 of inlet diversion valve 8 and gas inlet 112 is connected to the second air outlet 92 of inlet diversion valve 9.

[0047] The bottom cleaning component is located at the bottom of the aeration zone 3 of the tank 1. The bottom cleaning component is provided with a gas-liquid mixing inlet, which is connected to the mixing outlet 113 of the gas-liquid mixer 11. The bottom cleaning component is provided with multiple water outlet holes.

[0048] In this embodiment, as Figure 1-3As shown, the T-shaped vertical partition 2 divides the tank 1 into an aeration zone 3, a sedimentation zone 5, and a filtration zone 4. During normal use, reclaimed water enters the aeration zone 3 through the inlet 6 and then through the first outlet 81 of the inlet diversion valve 8. It then comes into full contact with the gas entering from the air inlet 7 and being introduced into the aeration device through the first outlet 91 of the air diversion valve 9, forming bubbles, increasing the dissolved oxygen content in the water, and enhancing the pollutant degradation efficiency. Subsequently, the water flows into the sedimentation zone 5, where some suspended particles settle. The upper layer of water then enters the filtration zone 4 and is finally discharged through the outlet 41. After prolonged use, sludge and impurities may accumulate at the bottom of the aeration zone 3 and sedimentation zone 5, affecting the treatment effect. In this case, the inlet diversion valve 8 can be controlled to connect the second outlet 82 to the inlet 6, allowing cleaning water to flow into the inlet 6 of the aeration zone 3. Simultaneously, the air diversion valve 9 can be switched to connect the second outlet 92 to the air inlet 7, introducing compressed gas. Compressed gas and cleaning water enter the gas-liquid mixer 11, where they mix to form a gas-liquid mixture, which is then conveyed to the bottom cleaning assembly. The mixture is sprayed through the outlet holes of the bottom cleaning assembly to flush the bottom of the aeration zone 3 and the sedimentation zone 5, thereby removing attached deposits, preventing sludge accumulation, and improving the cleaning efficiency and operational stability of the equipment.

[0049] Specifically, such as Figure 1-2 As shown, a second drain hole 42 is provided on the upper part of the side wall of the filter zone 4, and the height of the second drain hole 42 is greater than the height of the water outlet 41.

[0050] Specifically, such as Figure 1-2 As shown, the multi-stage filtration treatment device for reclaimed water also includes a one-way valve (not shown in the figure), which is installed on the connecting pipe between the mixing outlet 113 of the gas-liquid mixer 11 and the gas-liquid mixing inlet of the bottom cleaning component.

[0051] In this embodiment, as Figure 1-2 As shown, the second drain hole 42 is used to prevent the water level in the filtration zone 4 from overflowing due to excessively high water levels. The function of the check valve is to ensure that the gas-liquid mixture can only flow from the gas-liquid mixer 11 to the bottom cleaning assembly, preventing reverse flow. In addition, the number of check valves is not limited to one; check valves are provided on the pipes of the liquid inlet 111 of the gas-liquid mixer 11 and the second outlet 82 of the inlet diversion valve 8, as well as on the pipes of the gas inlet 112 of the gas-liquid mixer 11 and the second outlet 92 of the inlet diversion valve 9.

[0052] Specifically, such as Figure 2 and Figure 4 As shown, an overflow guiding connection component is provided between the aeration zone 3 and the sedimentation zone 5. The overflow guiding connection component includes:

[0053] A flow guide frame 13 is installed on the aeration zone 3, located between the aeration zone 3 and the sedimentation zone 5. The flow guide frame 13 is provided with a flow guide trough.

[0054] A flow guide baffle 14 is provided on the outer edge of the flow guide channel, and a plurality of serrated overflow ports are provided on the flow guide baffle 14;

[0055] Overflow connection pipe 15, one end of which is connected to the bottom of the guide channel, and the other end extends into the sedimentation zone 5.

[0056] In this embodiment, as Figure 2 and Figure 4 As shown, the overflow connection pipe 15 connects the upper layer of aeration zone 3 to the lower layer of sedimentation zone 5. The overflow connection pipe 15 allows the fully aerated upper layer water in aeration zone 3 to be directly introduced into the lower layer of sedimentation zone 5, forming an upward water flow path. When the water level in aeration zone 3 reaches the height of the guide channel, the water first enters the guide channel through the serrated overflow port on the guide baffle 14. The serrated structure design ensures uniform water distribution and slows the flow velocity. Then, the water flows through the connection point between the bottom of the guide channel and the overflow connection pipe 15, flowing along the overflow connection pipe 15 into the lower layer of sedimentation zone 5, increasing the residence time of water in sedimentation zone 5 and allowing suspended particles to settle sufficiently.

[0057] In addition, an overflow guiding and connecting component is also provided between sedimentation zone 5 and filtration zone 4, located on sedimentation zone 5, connecting the upper layer of sedimentation zone 5 and the upper layer of filtration zone 4. The structure of this overflow guiding and connecting component is similar to that between aeration zone 3 and sedimentation zone 5, including a guide channel frame, guide baffles, and overflow connecting pipe. The clearer liquid in the upper layer of sedimentation zone 5 enters the upper layer of filtration zone 4 through the overflow guiding and connecting component, ensuring that the water entering filtration zone 4 has undergone preliminary sedimentation, reducing the load on the filtration device. Filtration zone 4 has multiple filter layers, from top to bottom: a coarse filter layer, a medium filter layer, and a fine filter layer. The coarse filter layer can be composed of quartz sand, used to intercept larger suspended particles in the water; the medium filter layer is composed of activated carbon material, capable of adsorbing organic matter and some dissolved pollutants in the water; the fine filter layer is composed of a mixture of quartz sand and zeolite, further removing fine particulate matter in the water. The particle size of the three filter materials gradually decreases from top to bottom, forming a gradient filtration structure, ensuring that water flow can pass evenly through each layer of filter media, while avoiding mixing between filter media layers. An isolation net is installed between each filter layer to prevent different materials from mixing and to facilitate the replacement of filter media in layers during later maintenance. The filtered water is collected through the filter cap 43 and discharged through the outlet 41.

[0058] The gas-liquid mixer 11 is existing technology and will not be described in detail in this embodiment. In this device, the gas-liquid mixer 11 is mainly used to fully mix the cleaning water with the compressed gas to generate a gas-liquid mixture with good flushing ability, providing a power source for the bottom cleaning component and the sedimentation zone flushing component.

[0059] Specifically, such as Figure 1-2As shown, the multi-stage filtration treatment device for reclaimed water also includes a maintenance ladder assembly, which comprises:

[0060] Inclined ladder 161 is installed along the side wall of the box body 1;

[0061] Operating platform 162 is connected to the top of inclined ladder 161.

[0062] In this embodiment, as Figure 1-2 As shown, the operating platform 162 is located on the upper part of the housing 1, spanning above the aeration zone 3, sedimentation zone 5, and filtration zone 4. An inclined ladder 161 is fixed to the side wall of the housing 1, forming an angle with the ground, providing access from the ground to the operating platform 162. The maintenance ladder assembly allows operators to reach the upper part of the housing 1 for routine maintenance and inspection. Through the operating platform 162, operators can directly access components such as the inlet diversion valve 8, the air diversion valve 9, and the gas-liquid mixer 11, making necessary adjustments or replacements. Furthermore, they can visually monitor the bubble distribution in the aeration zone 3, the settling effect in the sedimentation zone 5, and the operating status of the filtration zone 4.

[0063] Specifically, such as Figure 1-2 As shown, the aeration device includes:

[0064] The aeration main pipe 101 is horizontally installed at the bottom of the aeration zone 3. The aeration main pipe 101 is connected to the first air outlet 91 of the air inlet diversion valve 9. The end of the aeration main pipe 101 is a closed end.

[0065] Three aeration discs 102 are installed on the aeration main pipe 101 and are connected to the aeration main pipe 101.

[0066] In this embodiment, as Figure 1-2 As shown, the aeration disc 102 enables unidirectional gas flow, preventing blockage.

[0067] Specifically, such as Figure 1-2 As shown, the bottom cleaning assembly includes:

[0068] The flushing distribution pipe 123 is horizontally installed at the bottom of the aeration zone 3, and the water outlet is installed on the flushing distribution pipe 123.

[0069] Specifically, such as Figure 1-2 , Figure 3 As shown, the multi-stage filtration treatment device for reclaimed water also includes a sedimentation zone flushing component, which comprises:

[0070] Water inlet connecting pipe 171 is located at the bottom of aeration zone 3. One end of water inlet connecting pipe 171 is connected to the bottom cleaning component, and the other end passes through T-shaped vertical dividing plate 2.

[0071] Connecting pipe 172 is installed in sedimentation zone 5. One end of connecting pipe 172 is connected to water inlet pipe 171, and the other end is provided with two connection ports.

[0072] Water outlet pipe 173 is installed at the connection port of connecting pipe 172. Water outlet pipe 173 is provided with multiple spray holes and the end of water outlet pipe 173 is a closed end.

[0073] In this embodiment, as Figure 1-2 and Figure 3 As shown, some of the water outlets on the flushing distribution pipe 123 face the bottom of the aeration zone 3, while the rest face the sidewalls of the aeration zone 3. During cleaning, the gas-liquid mixture enters the flushing distribution pipe 123 from the gas-liquid mixer 11 and is ejected in the form of a high-speed jet through the water outlets, flushing away the deposits on the bottom and sidewalls of the aeration zone 3, preventing sludge accumulation, and maintaining the normal operating volume of the aeration zone 3.

[0074] The inlet pipe 171 of the sedimentation zone flushing assembly is located at the bottom of the aeration zone 3 near the T-shaped vertical dividing plate 2. One end is connected to the flushing distribution pipe 123, and the other end passes through the T-shaped vertical dividing plate 2 into the sedimentation zone 5. A connecting pipe 172 is located within the sedimentation zone 5. One end of the connecting pipe 172 is connected to the inlet pipe 171, and the other end is equipped with a four-way valve and four outlet pipes 173. Two outlet pipes 173 are installed at the two connection ports of the four-way valve, and the third connection port of the four-way valve connects to a second connecting pipe. A three-way valve is installed at the end of the second connecting pipe, and the other two outlet pipes 173 are installed at the two connection ports of the three-way valve. Each outlet pipe 173 has multiple spray holes, and the end of each outlet pipe 173 is a closed end. The outlet pipes cover most of the sedimentation zone 5, with the spray holes on each outlet pipe 173 facing the bottom and side walls of the sedimentation zone 5. This allows the gas-liquid mixture to not only clean the aeration zone 3, but also to thoroughly flush the sedimentation zone 5 through the sedimentation zone flushing component, removing the sludge buildup at the bottom of the sedimentation zone 5.

[0075] Specifically, such as Figure 1-2 As shown, the multi-stage filtration treatment device for reclaimed water also includes multiple support clamps 18. The support clamps 18 are installed on the inner wall of the aeration zone 3 of the housing 1. The support clamps 18 are provided with fixing rings, which are fitted on the connecting pipe between the gas-liquid mixing inlet of the bottom cleaning component and the mixing outlet 113 of the gas-liquid mixer 11.

[0076] Specifically, such as Figure 1-2 As shown, the bottom of the filtration zone 4 of the housing 1 is provided with fifteen filter caps 43, and the filter caps 43 are connected to the water outlet 41.

[0077] In this embodiment, as Figure 1-2 As shown, bracket clamps 18 are provided not only on the connecting pipe between the mixing outlet 113 of the gas-liquid mixer 11 and the gas-liquid mixing inlet of the bottom cleaning component, but also at the bottom of the flushing distribution pipe 123 and the bottom of the aeration main pipe 101.

[0078] The bottom of filtration zone 4 is equipped with fifteen filter caps 43, arranged in five rows and three columns. The surface of each filter cap has micropores. The bottom of each filter cap 43 is connected to a pipe that collects the water filtered by the filter caps 43 and connects to the outlet 41. Water flows from top to bottom in filtration zone 4, entering the interior of the filter caps 43 through the micropores on their surface. The filter caps 43 prevent filter media loss, maintaining the long-term stable operation of the filtration system.

[0079] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A multi-stage filtration treatment device for reclaimed water, characterized in that, include: The box (1) is provided with a T-shaped vertical partition plate (2) inside the box (1). The T-shaped vertical partition plate (2) divides the box (1) into an aeration zone (3), a sedimentation zone (5) and a filtration zone (4). The aeration zone (3) and the sedimentation zone (5) are connected to each other. The filtration zone (4) and the sedimentation zone (5) are connected to each other. The aeration zone (3) is provided with a water inlet (6) and an air inlet (7) at the top. The filtration zone (4) is provided with a water outlet (41). An inlet diversion valve (8) is installed on the inlet (6) of the aeration zone (3). The inlet diversion valve (8) has a first outlet (81) and a second outlet (82). The first outlet (81) is connected to the aeration zone (3). An air intake diversion valve (9) is installed on the air inlet (7) of the aeration zone (3). The air intake diversion valve (9) is provided with a first air outlet (91) and a second air outlet (92). An aeration device is installed at the bottom of the aeration zone (3) and is connected to the first air outlet (91) of the air inlet diversion valve (9). A gas-liquid mixer (11) is fixedly installed on the upper part of the housing (1). The gas-liquid mixer (11) is provided with a liquid inlet (111), a gas inlet (112) and a mixing outlet (113). The liquid inlet (111) is connected to the second water outlet (82) of the inlet diversion valve (8), and the gas inlet (112) is connected to the second air outlet (92) of the inlet diversion valve (9). Bottom cleaning assembly, the bottom cleaning assembly is located at the bottom of the aeration zone (3) of the box (1), the bottom cleaning assembly is provided with a gas-liquid mixing inlet, the gas-liquid mixing inlet is connected to the mixing outlet (113) of the gas-liquid mixer (11), and the bottom cleaning assembly is provided with multiple water outlet holes.

2. The multi-stage filtration treatment device for reclaimed water according to claim 1, characterized in that, The upper part of the side wall of the filter area (4) is provided with a second drain hole (42), and the height of the second drain hole (42) is greater than the height of the water outlet (41).

3. The multi-stage filtration treatment device for reclaimed water according to claim 1, characterized in that, It also includes at least one check valve installed on the connecting pipe between the mixing outlet (113) of the gas-liquid mixer (11) and the gas-liquid mixing inlet of the bottom cleaning assembly.

4. The multi-stage filtration treatment device for reclaimed water according to claim 1, characterized in that, An overflow guiding and connecting component is provided between the aeration zone (3) and the sedimentation zone (5), the overflow guiding and connecting component comprising: A flow guide frame (13) is provided on the aeration zone (3) and located between the aeration zone (3) and the sedimentation zone (5). The flow guide frame (13) is provided with a flow guide. A flow guide baffle (14) is provided on the outer edge of the flow guide channel, and the flow guide baffle (14) is provided with a plurality of sawtooth overflow ports; An overflow connection pipe (15) is provided, with one end connected to the bottom of the guide channel and the other end extending into the sedimentation zone (5).

5. The multi-stage filtration treatment device for reclaimed water according to claim 1, characterized in that, It also includes a maintenance ladder assembly, the maintenance ladder assembly comprising: An inclined ladder (161) is provided along the side wall of the box (1); An operating platform (162) is connected to the top of the inclined ladder (161).

6. The multi-stage filtration treatment device for reclaimed water according to claim 1, characterized in that, The aeration device includes: Aeration main pipe (101) is horizontally arranged at the bottom of the aeration zone (3). The aeration main pipe (101) is connected to the first air outlet (91) of the air inlet diversion valve (9). The end of the aeration main pipe (101) is a closed end. At least one aeration disc (102) is mounted on the aeration main pipe (101) and is connected to the aeration main pipe (101).

7. The multi-stage filtration treatment device for reclaimed water according to claim 1, characterized in that, The bottom cleaning assembly includes: A flushing distribution pipe (123) is horizontally arranged at the bottom of the aeration zone (3), and the water outlet is arranged on the flushing distribution pipe (123).

8. The multi-stage filtration treatment device for reclaimed water according to claim 1, characterized in that, It also includes a sedimentation zone flushing component, which comprises: Water inlet connecting pipe (171) is provided at the bottom of the aeration zone (3). One end of the water inlet connecting pipe (171) is connected to the bottom cleaning component, and the other end passes through the T-shaped vertical dividing plate (2). A connecting pipe (172) is provided in the sedimentation zone (5). One end of the connecting pipe (172) is connected to the water inlet connecting pipe (171), and the other end is provided with at least one connection port. At least one water outlet pipe (173) is installed at the connection port of the connecting pipe (172), the water outlet pipe (173) is provided with multiple spray holes, and the end of the water outlet pipe (173) is a closed end.

9. The multi-stage filtration treatment device for reclaimed water according to claim 1, characterized in that, It also includes at least one bracket clamp (18), which is installed on the inner wall of the aeration zone (3) of the box (1). The bracket clamp (18) is provided with a fixing ring, which is sleeved on the connecting pipe between the gas-liquid mixing inlet of the bottom cleaning component and the mixing outlet (113) of the gas-liquid mixer (11).

10. The multi-stage filtration treatment device for reclaimed water according to claim 1, characterized in that, The filter area (4) of the box (1) is provided with a plurality of filter caps (43) which are communicated with the water outlet (41).

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