Sewage treatment device capable of precipitating, filtering and automatically cleaning

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a precipitation filtering automatic cleaning sewage treatment device which comprises a sand filtering tank and a clean water tank, a sand filter layer is arranged at the bottom of the sand filter, a filter water outlet is formed in the bottom of the sand filter layer, and a drain outlet is formed in the upper set liquid level height; one end of the clean water drainage pipe is upwards positioned at the set liquid level height of the clean water tank, and the other end of the clean water drainage pipe is communicated with the clean water tank drainage port; one path of the filter tank water outlet is communicated with a clean water tank water inlet at the bottom of the clean water tank through a water outlet valve, and the other path is communicated with the clean water tank water inlet through a backwashing pump and a backwashing valve; a first liquid level meter is arranged in the sand filter tank, a second liquid level meter is arranged in the clean water tank, and the amount of sewage discharged during automatic cleaning of the sedimentation filtering automatic cleaning sewage treatment device is less than that of a valveless filter tank; the problems that a valveless filter tank is high in backwashing frequency and large in sewage discharge amount during backwashing can be solved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to an automatic cleaning wastewater treatment device for sedimentation and filtration. Background Technology

[0002] In wastewater treatment processes, traditional combinations of sedimentation tanks, quartz sand filters, and clear water tanks often adopt a separate structure, which occupies a large area. Small-scale treatment plants often lack flexible design and have insufficient automatic backwashing cycles, which can easily lead to increased resistance of the quartz sand filter layer and thus affect the effluent flow rate.

[0003] To address these issues, existing technology includes a utility model patent with patent number CN202220935769.2, which discloses a gravity-type valveless filter. This technology introduces raw water through an inlet pipe, which is then evenly distributed onto the filter layer via a siphon riser and a baffle plate under the top cover, achieving top-down filtration. The filtered clean water collects in the collection chamber and then flows into the flushing water tank through a connecting channel.

[0004] However, as filtration continues, the filter bed resistance gradually increases, causing the water level in the siphon riser pipe to rise. Once it reaches the siphon auxiliary pipe inlet, the water flow drops sharply, creating a vacuum and triggering the backwashing mechanism. At this point, water in the backwash tank flows backward through the filter bed for cleaning. Once the water level drops below the siphon failure pipe inlet, the siphon effect is released, the backwashing ends, and the filtration process restarts. Therefore, repeated backwashing often occurs, resulting in a high backwashing frequency and a large volume of wastewater discharged during backwashing. Utility Model Content

[0005] To address the issues of high backwashing frequency and large wastewater discharge during backwashing in existing gravity-type valveless filters, this invention provides an automatic cleaning wastewater treatment device for sedimentation filtration, characterized by low backwashing frequency and small wastewater discharge during automatic cleaning.

[0006] To achieve the above objectives, the following technical solution is provided:

[0007] An automatic cleaning wastewater treatment device with sedimentation and filtration includes a sand filter, a clear water tank, and a sedimentation tank; the sedimentation tank is connected to the sand filter; the sand filter has a sand filter layer at the bottom, a filter outlet at the bottom of the sand filter layer, and a sewage outlet at a set liquid level at the top; the clear water tank has a clear water tank drain outlet and a clear water drain pipe at the bottom, one end of the clear water drain pipe is located at a set liquid level in the clear water tank, and the other end is connected to the clear water tank drain outlet; one path of the filter outlet is connected to the clear water tank inlet at the bottom of the clear water tank through an outlet valve, and the other path is connected to the clear water tank inlet through a backwash pump and a backwash valve; a first liquid level gauge is installed in the sand filter, and a second liquid level gauge is installed in the clear water tank.

[0008] Furthermore, it also includes a sedimentation tank, with a water distribution area above the sedimentation tank, an inclined tube sedimentation tank inside the water distribution area, a mud-water separation device inside the inclined tube sedimentation tank, a mud hopper at the bottom of the mud-water separation device, and a sand filter tank connected to the top side through an outlet weir.

[0009] Furthermore, the sand filter layer includes one or more of the following: quartz filter media layer, manganese sand filter media layer, anthracite filter media, or activated carbon filter media.

[0010] Furthermore, the mud-water separation device is an inclined tube packing unit.

[0011] Furthermore, a sludge discharge port is provided at the bottom of the sludge hopper, and a drain valve is connected to the sludge discharge port.

[0012] The beneficial effects of this utility model are as follows: 1. The automatic cleaning sewage treatment device for sedimentation and filtration is more comprehensive, and can realize the functions of sedimentation, filtration and automatic backwashing in one unit; 2. After sedimentation treatment, the treatment load of the subsequent filtration stage is greatly reduced, and the backwashing frequency is lower than that of valveless filter tanks; it can treat sewage with high turbidity or suspended solids; 3. The amount of sewage discharged during automatic cleaning of the automatic cleaning sewage treatment device for sedimentation and filtration is less than that of valveless filter tanks; it can solve the problem of high backwashing frequency and large amount of sewage discharged during backwashing of valveless filter tanks. Attached Figure Description

[0013] Figure 1 This is a structural diagram of an automatic cleaning wastewater treatment device for sedimentation and filtration according to the present invention.

[0014] In the diagram: 1. Wastewater inlet; 2. Sand filter; 3. Clear water tank; 4. Sand filter layer; 5. Filter outlet; 6. Sewage outlet; 7. Clear water tank outlet; 8. Clear water drain pipe; 9. Outlet valve; 10. Backwash pump; 11. Backwash valve; 12. First level gauge; 13. Second level gauge; 14. Sedimentation tank; 15. Water distribution area; 16. Sludge hopper; 17. Outlet weir; 18. Inclined tube packing layer; 19. Sludge outlet; 20. Clear water tank inlet; 21. Inclined tube sedimentation tank. Detailed Implementation

[0015] The following detailed description of the automatic cleaning sewage treatment device for sedimentation and filtration according to this utility model is provided in conjunction with specific embodiments.

[0016] like Figure 1As shown, an automatic cleaning wastewater treatment device with sedimentation and filtration includes a sand filter tank 2, a clear water tank 3, and a sedimentation tank 14; the sedimentation tank 14 is connected to the sand filter tank 2; the bottom of the sand filter tank 2 is provided with a sand filter layer 4, the bottom of the sand filter layer 4 is provided with a filter outlet 5, and the upper part is provided with a sewage outlet 6 at a set liquid level height; the clear water tank 3 is provided with a clear water tank drain outlet 7 at the bottom and a clear water drain pipe 8, one end of the clear water drain pipe 8 is located at the set liquid level height of the clear water tank 3, and the other end is connected to the clear water tank drain outlet 7; one path of the filter outlet 5 is connected to the clear water tank inlet 20 at the bottom of the clear water tank 3 through an outlet valve 9, and the other path is connected to the clear water tank inlet 20 in sequence through a backwash pump 10 and a backwash valve 11; the sand filter tank 2 is provided with a first liquid level gauge 12, and the clear water tank 3 is provided with a second liquid level gauge 13.

[0017] In this design, the first level gauge 12 is an electrode level gauge, and the second level gauge 13 is a float level gauge. The outlet valve 9 is an electric outlet valve.

[0018] The normal sedimentation and filtration process of this scheme is as follows: Wastewater enters the sand filter tank 2 and passes through the graded sand filter layer 4 from top to bottom. It then flows by gravity through the filter outlet 5 at the bottom of the sand filter layer 4 to the clear water tank inlet 20 and finally into the clear water tank 3. The hydrostatic pressure on both sides of the sand filter tank 2 and the clear water tank 3 is equal, so the liquid levels on both sides tend to be consistent. When the liquid level in the clear water tank 3 is high, it is discharged through the clear water drain pipe 8 into the clear water tank drain outlet 7.

[0019] The automatic cleaning process of this scheme is as follows: When the electrode level gauge in the sand filter 2 reaches the high level, and simultaneously the float level gauge in the clear water tank 3 is also at the high level, automatic cleaning begins. During backwashing, the outlet valve 9 of the sedimentation tank 14 is closed, the backwash electric valve is opened, and the backwash pump 10 starts running, using the water temporarily stored in the clear water tank 3 to clean the sand filter layer 4. The wastewater after backwashing is discharged through the upper drain outlet 6 of the sand filter 2. When the liquid level in the clear water tank 3 is low, the backwash pump 10 is stopped by controlling the float level gauge, and the automatic cleaning process ends. The amount of wastewater discharged during automatic cleaning of this sedimentation filter wastewater treatment device is less than that of a valveless filter; it can solve the problem of high backwashing frequency and large wastewater discharge during backwashing of valveless filters.

[0020] Valveless filters have automatic backwashing functions, but they do not have integrated wastewater treatment functions that combine sedimentation, filtration, and automatic backwashing, and therefore cannot treat wastewater with high turbidity or high suspended solids. This solution also includes a sedimentation tank 14, with a water distribution area 15 located above it. Within the water distribution area 15 is an inclined tube sedimentation tank, which contains a sludge-water separation device. The bottom of the sludge-water separation device is connected to a sludge hopper 16, and its top side is connected to the sand filter 2 via a triangular outlet weir 17.

[0021] Wastewater enters the water distribution zone 15 of sedimentation tank 14 through wastewater inlet 1. The water flows upwards through a mud-water separation device for mud-water separation. The settled wastewater enters sand filter 2 through the effluent weir 17 at the top of sedimentation tank 14. The sediment settles into sludge hopper 16 under gravity. Sludge hopper 16 has a sludge discharge port 19 at its bottom, connected to a drain valve. The sediment is discharged through sludge discharge port 19. This sedimentation, filtration, and automatic backwashing wastewater treatment device significantly reduces the processing load of subsequent filtration stages after sedimentation treatment, and the backwashing frequency is lower than that of valveless filters. It can treat wastewater with high turbidity or suspended solids. This solution is comprehensive, integrating sedimentation, filtration, and automatic backwashing functions into one integrated system.

[0022] In this embodiment, the sand filter layer 4 includes one or more of the following: a quartz filter media layer, a manganese sand filter media layer, anthracite filter media, or activated carbon filter media. The mud-water separation device is an inclined tube packing unit.

[0023] Inclined tube packing units consist of many parallel inclined tubes, typically hexagonal honeycomb structures. The angled design of the inclined tubes facilitates water flow and the sedimentation of suspended solids. This design generates vortices and turbulence as water flows through the inclined tubes, enhancing the settling effect. Inclined tube packing is a type of packing material used in water treatment, usually made of polymer materials, and is fan-shaped or similar to short, inclined tubes, placed at a certain angle (such as 45 degrees or 60 degrees) in the packing layer. Inclined tube packing increases the contact area between water and suspended solids, aiding in the sedimentation and separation of suspended solids and shortening the time for mud-water separation.

Claims

1. An automatic cleaning wastewater treatment device for sedimentation and filtration, characterized in that, It includes a sand filter (2), a clear water tank (3), and a sedimentation tank (14); the sedimentation tank (14) is connected to the sand filter (2), the bottom of the sand filter (2) is provided with a sand filter layer (4), the bottom of the sand filter layer (4) is provided with a filter outlet (5), and the upper part is provided with a sewage outlet (6) at a set liquid level height; the clear water tank (3) is provided with a clear water tank drain outlet (7) and a clear water drain pipe (8) at the bottom, one end of the clear water drain pipe (8) is upward at the clear water tank. At the set liquid level height of the water tank (3), the other end is connected to the drain outlet (7) of the clear water tank; the filter outlet (5) is connected to the clear water tank inlet (20) at the bottom of the clear water tank (3) through the outlet valve (9), and the other end is connected to the clear water tank inlet (20) through the backwash pump (10) and the backwash valve (11); the sand filter tank (2) is equipped with a first liquid level gauge (12), and the clear water tank (3) is equipped with a second liquid level gauge (13).

2. The automatic cleaning wastewater treatment device for sedimentation and filtration as described in claim 1, characterized in that, The sedimentation tank (14) has a water distribution area (15) above it. The water distribution area (15) has an inclined tube sedimentation tank (21). The inclined tube sedimentation tank (21) has a mud-water separation device. The water distribution area (15) has a mud-water separation device. The bottom of the mud-water separation device is connected to a mud hopper (16). The top side is connected to the sand filter tank (2) through an outlet weir (17).

3. The automatic cleaning wastewater treatment device for sedimentation and filtration as described in claim 1 or 2, characterized in that, The sand filter layer (4) includes one or more of the following: quartz filter media layer, manganese sand filter media layer, anthracite filter media or activated carbon filter media.

4. The automatic cleaning wastewater treatment device for sedimentation and filtration as described in claim 1 or 2, characterized in that, The mud-water separation device is an inclined tube packing unit.

5. The automatic cleaning wastewater treatment device for sedimentation and filtration as described in claim 3, characterized in that, The mud-water separation device is an inclined tube packing unit.

6. The automatic cleaning wastewater treatment device for sedimentation filtration as described in claim 1, 2, or 5, characterized in that, The bottom of the mud hopper (16) is provided with a mud discharge port (19), and a sewage discharge valve is connected to the mud discharge port (19).

7. The automatic cleaning wastewater treatment device for sedimentation and filtration as described in claim 3, characterized in that, The bottom of the mud hopper (16) is provided with a mud discharge port (19), and a sewage discharge valve is connected to the mud discharge port (19).

8. The automatic cleaning wastewater treatment device for sedimentation and filtration as described in claim 4, characterized in that, The bottom of the mud hopper (16) is provided with a mud discharge port (19), and a sewage discharge valve is connected to the mud discharge port (19).

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