Active sand filter

Abstract

The active sand filter comprises a shell and a bottom sand filtering area, the sewage treatment device is provided with a water inlet pipe and a water distributor; an outlet of the water distributor is positioned at the lower part of the sand filtering area; the filter sand regeneration device is provided with a lifting assembly and a separation assembly, the lifting assembly is provided with a lifting pipe and a propeller, one end of the lifting pipe extends into the bottom of the sand filter area, the other end extends out of the sand filter area, and the propeller lifts dirty sand; the separation assembly is provided with a sand washing water hopper and a sand washer which sleeve the outer side of the lifting pipe, the sand washing water hopper is communicated with the outlet of the lifting pipe, the sand washer is communicated with the sand washing water hopper, a sand washing water inlet is formed in the bottom of the sand washer, and the sand washing water hopper is communicated with a sand washing water outlet pipe; filter sand containing treatment impurities is pushed upwards by the propeller from the cone bottom of the shell to the sand washing water hopper on the top and then falls into the sand washing device, and after the filter sand and sand washing water flowing upwards are flushed, the washed filter sand falls back to the sand filtering area to form sand circulation. The center screw rod is adopted for lifting, the mechanical lifting circulation amount is stable and controllable, and sand blocks at the early hardening stage can be scattered.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, in particular to an active sand filter. Background Art

[0002] The activated sand filter is a three-stage sewage treatment equipment that integrates flocculation, sedimentation and filtration. It is widely used in the fields of drinking water, industrial water, sewage deep treatment and reclaimed water reuse. The activated sand filter uses the principle of upflow fluidized bed filtration and a single homogeneous filter material. Filtration and sand washing are performed simultaneously. It can operate continuously and automatically for a long time without stopping for backwashing. The sand lifting and sand washing structure replaces the traditional high-power backwashing system. The operating energy consumption is extremely low, and it can effectively remove suspended matter and total phosphorus in sewage, ensuring that the final effluent water quality can stably meet the standards.

[0003] In the actual engineering application process, the activated sand filter also has some problems. During the long-term operation, some pollutant components adhere to the surface of the filter sand, causing the filter sand to become compacted. The compacted filter sand enters the air lift pipeline, which may cause the air lift pipeline to be blocked. Once the air lift pipeline is blocked, the sand circulation volume will be reduced, and it will be difficult to control a stable sand circulation volume. Moreover, as the air lift effect decreases, the larger compacted sand blocks will be difficult to lift, so that the sand balls in the active sand filter will accumulate and become larger to form a large area of ​​compaction, which will further increase the degree of blockage in the air lift pipeline, seriously affecting the sand circulation and ultimately reducing the sewage treatment effect. Utility Model Content

[0004] In view of the above technical problems, the purpose of the utility model is to provide an activated sand filter, which replaces the air lift with the central screw lift, and the mechanical lifting circulation volume is stable and controllable, and can break up the sand balls formed by the adhesion between the filter sand in the early stage of compaction, reduce the formation of compaction, make the lifting pipe not easy to be blocked, the lifting filter sand amount is easy to control, and the water distribution of the activated sand filter is uniform.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] An activated sand filter, comprising:

[0007] The shell has a cone structure at the bottom, and the filter sand is supported on the inner cone surface to form a sand filter area;

[0008] a sewage treatment device, which is arranged in the housing and has a water inlet pipe and a water distributor, wherein the water inlet pipe is connected to an external sewage source; the inlet of the water distributor is connected to the water inlet pipe, and the outlet of the water distributor is located at the lower part of the sand filter area; and

[0009] A filter sand regeneration device is arranged in the housing and has a lifting component and a separation component.

[0010] The lifting assembly comprises a lifting pipe and a propeller, one end of the lifting pipe extends into the bottom of the sand filter area, and the other end extends out of the sand filter area, and the propeller is arranged in the lifting pipe and is used to lift the dirty sand at the bottom of the sand filter area;

[0011] The separation assembly comprises a sand washing bucket and a sand washer which are sleeved on the outside of the lifting pipe and arranged from top to bottom, the sand washing bucket is connected with the outlet of the lifting pipe, the sand washer is connected with the sand washing bucket, a sand washing water inlet is provided at the bottom of the sand washing device, and the sand washing bucket is also connected with a sand washing water outlet pipe;

[0012] The filter sand containing treated impurities is pushed upward by the propeller from the bottom of the cone of the shell to the sand washing water bucket at the top and then falls into the sand washing device. After being flushed by the upward flowing sand washing water, the cleaned filter sand falls back to the sand filtration area to form a sand circulation.

[0013] In some technical solutions, the propeller has a propeller shaft and blades, the blades are arranged on the propeller shaft in a spiral shape, and the propeller shaft extends out of the housing and is connected to the power equipment.

[0014] In some technical solutions, the width of the propeller is slightly smaller than the inner diameter of the lifting tube, and the two ends of the propeller along the axial direction are respectively flush with the inlet and outlet of the lifting tube.

[0015] In some technical solutions, the filter sand regeneration device further includes a sand distribution component.

[0016] The sand distribution assembly includes a conduit and a sand distribution device. The conduit is sleeved on the outside of the lifting pipe, and one end of the conduit is connected to the bottom of the sand washing device, and the other end is connected to the inlet of the sand distribution device. The outlet of the sand distribution device is a bell mouth facing the bottom of the sand filtering area.

[0017] In some technical solutions, a clear water zone is formed in the housing above the sand filter zone.

[0018] The sewage treatment device also includes a water outlet weir arranged at the upper part of the clean water area. The filtered clean water in the clean water area passes through the water outlet weir, enters the water outlet pipe, and then leaves the active sand filter.

[0019] In some technical solutions, the outlet of the sand washing water pipe is lower than the height of the water outlet weir, so that the liquid level in the sand washing water bucket is lower than the liquid level in the clean water area;

[0020] The sand washing water inlet of the sand washing device is connected with the clean water area, and the filtered clean water flows upward into the sand washing device by utilizing the liquid level difference between the sand washing water hopper and the clean water area.

[0021] In some technical solutions, a plurality of curved channels arranged in a vertical direction are provided in the sand washer, the top of the curved channels are connected to the sand washing water hopper, and the bottom of the curved channels are connected to the sand washing water inlet.

[0022] In some technical solutions, the water distributor has eight evenly distributed water distribution pipes.

[0023] In some technical solutions, a drain port is provided at the bottom of the shell.

[0024] In some technical solutions, a plurality of supports are evenly distributed on the outer peripheral side of the cone structure.

[0025] The utility model adopts the above technical solution to have at least the following beneficial effects:

[0026] 1. The utility model provides an active sand filter, which replaces the air lift with a central screw lift, and the mechanical lifting circulation volume is stable and controllable, and can break up the sand balls formed by the adhesion between the filter sands in the early stage of compaction, reduce the formation of compaction, make the lifting pipe not easy to be blocked, the lifting filter sand volume is easy to control, and the water distribution of the active sand filter is uniform;

[0027] 2. The utility model provides an active sand filter. By designing the height of the outlet pipe of the sand washing water outlet pipe to be lower than the water outlet height of the water outlet weir, the clean water after filtration can be introduced into the bottom of the sand washer by utilizing the liquid level difference between the sand washing water bucket and the clean water area, and the filter sand is backwashed, and the pollutants and impurities attached to the filter sand are discharged through the sand washing water outlet pipe. The washed filter sand falls back to the sand filter area by its own weight; the structural design is ingenious, without additional power loss and equipment configuration, which significantly reduces the sewage treatment cost and improves the sewage treatment efficiency;

[0028] 3. The utility model provides an active sand filter, which improves the washing efficiency and effect of the filter sand by means of a plurality of curved channels arranged vertically in the sand washer.

[0029] 4. The utility model provides an active sand filter, in which the sand bed in the shell continuously and slowly sinks, and the flowing circulating sand is evenly distributed in the sand filter area through the sand distributor after purification, and the sewage is evenly distributed on the lower section of the sand filter through the water distributor, so that continuous purification of sewage can be achieved, and the equipment has a compact structure, small footprint, low energy consumption, low equipment investment, and convenient inspection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings and their marks required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a schematic structural diagram of the active sand filter described in an embodiment of the utility model.

[0032] The meanings of the symbols in the figure are as follows:

[0033] 1—water inlet pipe, 2—water distributor, 3—sand filter area, 4—drain outlet, 5—water outlet weir, 6—water outlet pipe, 7—motor, 8—propeller shaft, 9—propeller blade, 10—sand washer, 11—sand washing water outlet pipe, 12—sand washing water bucket. DETAILED DESCRIPTION

[0034] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0035] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0036] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0037] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0038] Example 1

[0039] This embodiment provides an active sand filter, such as Figure 1 , including a shell and a sewage treatment device and a filter sand regeneration device in the shell, the sewage treatment device is used for sewage purification, and the filter sand regeneration device is used for the recycling regeneration of filter sand.

[0040] In the above embodiment, the shell is formed by connecting the upper column section and the bottom cone section, and the filter sand is supported on the inner cone surface to form a sand filter area 3, and a clean water area is formed above the sand filter area 3.

[0041] Preferably, the shell is suspended above the ground, specifically, by setting supports, the supports are evenly distributed along the outer circumference of the cone section of the shell, preferably, three supports are used, the top ends of the supports are fixedly connected to the cone section shell, and the bottom ends are in contact with the ground.

[0042] In the above embodiment, the sewage treatment device has an inlet pipe 1 and a water distributor 2, the inlet pipe 1 is connected to an external sewage source; the inlet of the water distributor 2 is connected to the inlet pipe 1, and the outlet of the water distributor 2 is located at the lower part of the sand filter area 3.

[0043] Preferably, the water distributor 2 has eight evenly distributed water distribution pipes, so that the sewage is evenly distributed on the cross section of the sand filter area 3, thereby improving the sewage treatment efficiency.

[0044] In the above embodiment, the sewage treatment device further includes a water outlet weir 5 disposed at the upper part of the clean water area. The filtered clean water in the clean water area passes through the water outlet weir 5 into the water outlet pipe 6 and then leaves the activated sand filter.

[0045] In the above embodiment, the filter sand regeneration device has a lifting component and a separation component. The lifting component has a lifting pipe and a propeller. One end of the lifting pipe extends into the bottom of the sand filter area 3, and the other end extends out of the sand filter area 3. The propeller is arranged in the lifting pipe for lifting the dirty sand at the bottom of the sand filter area 3.

[0046] Specifically, the propeller has a propeller shaft 8 and blades 9, the blades 9 are arranged in a spiral shape on the propeller shaft 8, the propeller shaft 8 extends out of the shell and is connected to the motor 7; preferably, the width of the propeller is slightly smaller than the inner diameter of the lifting pipe, and the two ends of the propeller along the axial direction are respectively flush with the inlet and outlet of the lifting pipe; the propulsion force of the propeller can be increased and the sand lifting efficiency can be improved.

[0047] The separation component comprises a sand washing hopper 12 and a sand washer 10 which are sleeved on the outside of the lifting pipe and arranged from top to bottom. The sand washing hopper 12 is connected with the outlet of the lifting pipe, and the sand washer 10 is connected with the sand washing hopper 12. A sand washing water inlet is provided at the bottom of the sand washing device 10, and the sand washing hopper 12 is also connected with a sand washing water outlet pipe 11.

[0048] The filter sand containing the treated impurities is pushed upward from the bottom of the cone of the shell by the propeller to the sand washing water bucket 12 at the top and then falls into the sand washer 10. After being flushed with the upward flowing sand washing water, the washed filter sand falls back to the sand filter area 3 to form a sand circulation.

[0049] In the above embodiment, a drain port 4 is provided at the bottom of the shell. When the active sand filter fails or needs to be shut down for maintenance, the filter sand and waste water in the active sand filter can be drained through the drain port 4 for maintenance.

[0050] In this embodiment, the original air lift method is replaced with a central propeller lift method. The mechanical lift circulation volume is stable and controllable, and the sand balls formed by adhesion between the filter sands in the early stage of compaction can be broken up, thereby reducing the formation of compaction, making the lift pipe less likely to be blocked, making the lift filter sand volume easy to control, and making the water distribution of the active sand filter even.

[0051] Example 2

[0052] This embodiment further includes the following improvements based on Embodiment 1:

[0053] A sand distribution assembly (not shown in the figure) is provided, including a conduit and a sand distribution device. The conduit is sleeved on the outside of the lifting pipe, and the top end of the conduit is connected to the bottom of the sand washing device 10, and the bottom end is connected to the inlet of the sand distribution device. The outlet of the sand distribution device is a bell mouth facing the bottom of the sand filtering area 3.

[0054] The clean sand after impurities are separated by the sand washer 10 falls to the bottom of the sand filter area 3 along the channel between the conduit and the paddle shaft 8, and is distributed through the trumpet-shaped opening, so that the filter sand is evenly distributed on the cross section of the shell and is not easy to accumulate, thereby improving the sewage treatment effect.

[0055] Example 3

[0056] This embodiment further includes the following improvements based on Embodiment 1:

[0057] The mouth of the sand washing water outlet pipe 11 is lower than the height of the water outlet weir 5, so that the liquid level in the sand washing water bucket 12 is lower than the liquid level in the clean water area; the sand washing water inlet of the sand washing device 10 is connected with the clean water area, and the filtered clean water flows upward into the sand washing device 10 using the liquid level difference between the sand washing water bucket 12 and the clean water area.

[0058] The structural design of this embodiment is ingenious, without additional power loss and equipment configuration, which significantly reduces the sewage treatment cost and improves the sewage treatment efficiency.

[0059] Example 4

[0060] This embodiment further includes the following improvements based on Embodiment 1:

[0061] A plurality of curved channels arranged in a vertical direction are provided in the sand washer 10, the top of the curved channels are connected to the sand washing water hopper 12, and the bottom of the curved channels are connected to the sand washing water inlet.

[0062] The curved channel design in this embodiment can increase the impact strength, contact time and area between sand washing water and filter sand, thereby significantly improving the sand washing efficiency and effect.

[0063] Example 5

[0064] This embodiment further describes the use of the active sand filter described in Examples 1-4:

[0065] Wastewater enters the water distributor 2 through the water inlet pipe 1. The water distributor 2 has 8 evenly distributed water distribution pipes that evenly distribute water into the active sand filter. The wastewater passes upward through the sand filter area 3. The pollutant components are adsorbed by the filter sand in the sand filter area 3. The filtered clean water enters the upper clean water area. The filtered clean water has two destinations. One is to enter the outlet pipe 6 through the outlet weir 5 and then leave the active sand filter. The other is to go upward through the sand washer 10 as convection between the sand washing water and the descending filter sand. After flushing the filter sand, the pollutant components are washed off the filter sand and brought into the sand washing water bucket 12. The sand washing water carries the pollutant components back to the front-end treatment process through the sand washing water outlet pipe 11, wherein the pipe mouth of the sand washing water outlet pipe 11 is lower than the height of the outlet weir 5, so that the liquid level in the sand washing water bucket 12 is lower than the liquid level of the clean water in the active sand filter, so that the sand washing water flows upward into the sand washing device 10 through the liquid level difference.

[0066] The filter sand in the sand filter area 3 moves downward in the opposite direction to the flow direction of the wastewater. A motor 7 is installed on the top of the active sand filter. The motor 7 is connected to the paddle shaft 8, and the paddle shaft 8 is connected to the paddle blade 9. The motor 7 rotates, driving the paddle shaft 8 and the paddle blade 9 to rotate at a uniform speed according to the set angular velocity to control the appropriate sand circulation amount. The filter sand with attached pollutant components is lifted by the paddle blades to the sand washing water bucket 12 and then falls into the sand washer 10. After being offset by the upward flowing sand washing water, the cleaned filter sand falls back to the sand filter area 3 to complete the sand circulation.

[0067] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the attached claims.

Claims

1. An activated sand filter, characterized in that: include: The shell has a cone structure at the bottom, and the filter sand is supported on the inner cone surface to form a sand filter area; A sewage treatment device is arranged in the shell and has a water inlet pipe and a water distributor, the water inlet pipe is connected to an external sewage source; the inlet of the water distributor is connected to the water inlet pipe, and the outlet of the water distributor is located at the lower part of the sand filter area; as well as A filter sand regeneration device is arranged in the housing and has a lifting component and a separation component. The lifting assembly comprises a lifting pipe and a propeller, one end of the lifting pipe extends into the bottom of the sand filter area, and the other end extends out of the sand filter area, and the propeller is arranged in the lifting pipe and is used to lift the dirty sand at the bottom of the sand filter area; The separation assembly comprises a sand washing bucket and a sand washer which are sleeved on the outside of the lifting pipe and arranged from top to bottom, the sand washing bucket is connected with the outlet of the lifting pipe, the sand washer is connected with the sand washing bucket, a sand washing water inlet is provided at the bottom of the sand washing device, and the sand washing bucket is also connected with a sand washing water outlet pipe; The filter sand containing treated impurities is pushed upward by the propeller from the bottom of the cone of the shell to the sand washing water bucket at the top and then falls into the sand washing device. After being flushed by the upward flowing sand washing water, the cleaned filter sand falls back to the sand filtration area to form a sand circulation.

2. The active sand filter according to claim 1, characterized in that: The propeller comprises a propeller shaft and propeller blades, wherein the propeller blades are arranged on the propeller shaft in a spiral shape, and the propeller shaft extends out of the housing and is connected to a power device.

3. The active sand filter according to claim 2, characterized in that: The width of the propeller is slightly smaller than the inner diameter of the lifting tube, and the two ends of the propeller along the axial direction are respectively flush with the inlet and outlet of the lifting tube.

4. The active sand filter according to claim 1, characterized in that: The filter sand regeneration device also includes a sand distribution component, The sand distribution assembly includes a conduit and a sand distribution device. The conduit is sleeved on the outside of the lifting pipe, and one end of the conduit is connected to the bottom of the sand washing device, and the other end is connected to the inlet of the sand distribution device. The outlet of the sand distribution device is a bell mouth facing the bottom of the sand filtering area.

5. The active sand filter according to claim 1, characterized in that: A clear water area is formed in the shell above the sand filter area. The sewage treatment device also includes a water outlet weir arranged at the upper part of the clean water area. The filtered clean water in the clean water area passes through the water outlet weir, enters the water outlet pipe, and then leaves the active sand filter.

6. The active sand filter according to claim 5, characterized in that: The outlet of the sand washing water outlet pipe is lower than the height of the outlet weir, so that the liquid level in the sand washing water bucket is lower than the liquid level in the clean water area; The sand washing water inlet of the sand washing device is connected with the clean water area, and the filtered clean water flows upward into the sand washing device by utilizing the liquid level difference between the sand washing water hopper and the clean water area.

7. The active sand filter according to claim 1, 5 or 6, characterized in that: The sand washer is provided with a plurality of curved channels arranged in a vertical direction, the top ends of the curved channels are connected to the sand washing water hopper, and the bottom ends of the curved channels are connected to the sand washing water inlet.

8. The active sand filter according to claim 1, characterized in that: The water distributor has eight evenly distributed water distribution pipes.

9. The active sand filter according to claim 1, characterized in that: A drain port is arranged at the bottom of the shell.

10. The active sand filter according to claim 1, characterized in that: A plurality of supports are evenly distributed on the outer peripheral side of the cone structure.

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