Sand filter for wastewater treatment

Abstract

The utility model discloses a sand filter for wastewater treatment. The sand filter comprises a sand filter main body, a gradient filtering assembly, an intelligent monitoring system and a backwashing device, three stages of filtering assemblies are arranged in the sand filter main body from top to bottom, and the particle sizes of sand layers are gradually reduced to realize efficient interception of suspended matters; pressure transmitters are mounted at a water inlet valve and a water outlet valve, and pressure difference and water quality data are fed back to a control assembly in real time in combination with a turbidity online monitor in a pipeline, so that gas-water pulse backwashing is dynamically triggered; the filter assembly is of a drawer type structure, filter materials are replaced through drawing of a sliding rail, and the maintenance efficiency is remarkably improved by combining the leakage-proof design of a sealing strip. The device has the advantages of high suspended matter removal rate, water and energy conservation, stable operation, convenience in maintenance and the like.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a sand filter for wastewater treatment. Background Technology

[0002] A sand filter is a device that uses sand layers to filter suspended solids and impurities in wastewater, and is suitable for various water treatment scenarios.

[0003] Most existing technologies use a single-layer sand filter structure. A single-layer sand filter structure cannot achieve gradient interception of dirt. Fine particles can easily penetrate the filter layer, resulting in large fluctuations in the turbidity of the effluent. In addition, traditional sand filters use a fixed-cycle backwashing mode that relies on experience to set. Frequent backwashing leads to water waste. Furthermore, after the filter media clumps, the machine needs to be stopped for manual sand turning or complete replacement, which is time-consuming and labor-intensive. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a sand filter for wastewater treatment.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] This utility model discloses a sand filter for wastewater treatment, comprising a sand filter body, an inlet valve installed at the top of the sand filter body, a first filter component, a second filter component, and a third filter component installed inside the sand filter body, each of the first, second, and third filter components having a sand layer inside, the particle size of the sand layer inside the first, second, and third filter components decreasing sequentially, a water collection tank installed at the bottom of the third filter component, an outlet valve installed at the bottom of the water collection tank, a connecting pipe installed between the water collection tank and the outlet valve, and a control component installed at one end of the sand filter body.

[0007] As a preferred technical solution of this utility model, the inlet valve and the outlet valve have the same structure and are each equipped with a DN interface at one end. The inlet end of the inlet valve and the outlet end of the outlet valve are respectively equipped with pressure transmitters. Both pressure transmitters are connected to the control component to monitor and feedback the difference between the inlet pressure and the outlet pressure.

[0008] As a preferred technical solution of this utility model, the turbidity monitor is installed inside the connecting pipe, the other end of the connecting pipe is connected to the water collection tank, a backwash pipe is installed at the bottom of the water collection tank, a backwash pump is installed at one end of the backwash pipe, and clean water is injected back into the first filter component, the second filter component and the third filter component through the backwash pump.

[0009] As a preferred technical solution of this utility model, the first filter component, the second filter component and the third filter component are all removably installed in the main body of the sand filter through sliding grooves, and the first filter component, the second filter component and the third filter component are provided with handles at the ends in the pulling direction.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] This utility model is a sand filter for wastewater treatment. It adopts a three-stage gradient sand layer to achieve step-by-step interception of suspended solids. At the same time, it triggers backwashing through pressure difference and turbidity data linkage to accurately match the actual pollution load. It is also equipped with a drawer-type filter component to support quick replacement of sand layers, which improves filtration efficiency, reduces water consumption, and saves a lot of maintenance costs. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a partial structural cross-sectional view of the present invention;

[0015] In the diagram: 1. Sand filter body; 2. Inlet valve; 201. Pressure transmitter; 3. First filter assembly; 301. Sliding groove; 302. Handle; 4. Second filter assembly; 5. Third filter assembly; 6. Water collection tank; 601. Backwash pipe; 602. Connecting pipe; 603. Turbidity monitor; 7. Outlet valve. Detailed Implementation

[0016] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0017] In the attached diagram, all identical reference numerals refer to the same components.

[0018] like Figure 1-2As shown, this utility model provides a sand filter for wastewater treatment. The main body 1 of the sand filter is a vertical box with an inlet valve 2 at the top and an outlet valve 7 at the bottom. Inside the box, from top to bottom, a first filter assembly 3, a second filter assembly 4, and a third filter assembly 5 are installed sequentially. Each assembly is filled with a sand layer, with the sand particle size decreasing progressively in the direction of water flow: 1.5-2.0 mm for the first layer, 0.8-1.2 mm for the second layer, and 0.4-0.6 mm for the third layer. The bottom of the third filter assembly 5 is connected to a water collection tank 6, and the bottom of the water collection tank 6 is connected to the outlet valve 7. A control component is located on one side of the main body 1 of the sand filter, integrating pressure and turbidity monitoring and backwashing control functions.

[0019] Furthermore, pressure transmitters 201 are installed at the inlet end of inlet valve 2 and the outlet end of outlet valve 7, respectively, with a range of 0-1.0 MPa and an accuracy of ±0.5% of full scale. The two pressure transmitters 201 monitor the pressure difference between the inlet and outlet water in real time and transmit the data to the control components.

[0020] An online turbidity monitor with a range of 0-100 NTU is embedded inside the connecting pipe 602, and it is equipped with a self-cleaning brush to reduce dirt interference. Turbidity data is synchronously fed back to the control unit to determine the filtration effect and trigger backwashing.

[0021] Furthermore, the bottom of the water collection tank 6 is connected to a backwash pipe 601, which is connected to an external clean water tank via a backwash pump. During backwashing, clean water is pressurized by the backwash pump and injected back into the water collection tank 6. The water flows through the third filter assembly 5, the second filter assembly 4, and the first filter assembly 3 in sequence, and finally flows into the wastewater tank from the top drain outlet.

[0022] Specifically, backwashing is triggered whenever the pressure difference between the inlet and outlet water exceeds 0.4 MPa for 5 consecutive minutes or the turbidity of the outlet water exceeds 5 NTU for 10 consecutive minutes. The control unit automatically closes the inlet valve 2 and the outlet valve 7, starts the backwash pump and the drain valve, and resumes the filtration process after the backwashing is completed.

[0023] Furthermore, the first filter assembly 3, the second filter assembly 4, and the third filter assembly 5 are removably installed inside the main body 1 of the sand filter via sliding rails. EPDM rubber sealing strips are installed on the contact surfaces between each assembly and the tank to prevent water leakage. A handle 302 is provided at the pull-out end of each assembly; when replacing the filter media, only the corresponding assembly needs to be pulled out, without needing to shut down the entire machine or empty the tank, improving maintenance efficiency by over 80%.

[0024] This utility model is a sand filter for wastewater treatment. It adopts a three-stage gradient sand layer to achieve step-by-step interception of suspended solids. At the same time, it triggers backwashing through pressure difference and turbidity data linkage to accurately match the actual pollution load. It is also equipped with a drawer-type filter component to support quick replacement of sand layers, which improves filtration efficiency, reduces water consumption, and saves a lot of maintenance costs.

[0025] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 sand filter for wastewater treatment, characterized in that, The system includes a sand filter body (1), with an inlet valve (2) installed at the top of the sand filter body (1). Inside the sand filter body (1) are installed a first filter assembly (3), a second filter assembly (4), and a third filter assembly (5). Inside the first filter assembly (3), the second filter assembly (4), and the third filter assembly (5) are sand layers. The particle size of the sand layers inside the first filter assembly (3), the second filter assembly (4), and the third filter assembly (5) decreases sequentially. A water collection tank (6) is installed on the bottom side of the third filter assembly (5). A water outlet valve (7) is installed at the bottom of the water collection tank (6). A connecting pipe (602) is installed between the water collection tank (6) and the water outlet valve (7). A control component is installed at one end of the sand filter body (1).

2. The sand filter for wastewater treatment according to claim 1, characterized in that, The inlet valve (2) and the outlet valve (7) have the same structure. The inlet end of the inlet valve (2) and the outlet end of the outlet valve (7) are respectively equipped with pressure transmitters (201). Both pressure transmitters (201) are connected to the control component to monitor and feedback the difference between the inlet pressure and the outlet pressure.

3. A sand filter for wastewater treatment according to claim 1, characterized in that, The turbidity monitor (603) is installed inside the connecting pipe (602). The other end of the connecting pipe (602) is connected to the water collection tank (6). A backflush pipe (601) is installed at the bottom of the water collection tank (6). A backflush pump is installed at one end of the backflush pipe (601), and clean water is injected back into the first filter assembly (3), the second filter assembly (4), and the third filter assembly (5) through the backflush pump.

4. A sand filter for wastewater treatment according to claim 1, characterized in that, The first filter assembly (3), the second filter assembly (4) and the third filter assembly (5) are all installed in the main body (1) of the sand filter through a sliding groove (301). The first filter assembly (3), the second filter assembly (4) and the third filter assembly (5) are provided with handles (302) at the ends of the first filter assembly (3), the second filter assembly (4) and the third filter assembly (5) in the pulling direction.

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