A device for preventing sand leakage of a V-type filter tank of an industrial membrane treatment system

Abstract

The utility model belongs to water treatment technical field provides a kind of industrial membrane processing system V type filter tank sand leakage prevention device, including intercepting net, intercepting groove, filter material backflow mechanism and control system, intercepting net is set in the outlet of backwash water of V type filter pool backwash end, intercepting groove is set in the below of intercepting net, filter material backflow mechanism connects the filter material layer of intercepting groove and V type filter pool, the quartz sand filter material intercepted in intercepting groove is transported back to the filter material layer of V type filter pool;Control system includes sensor, PLC controller and man-machine interface, man-machine interface is used to set operating parameter and display operating state, PLC controller is connected with sensor respectively, filter material backflow mechanism's backflow pump, man-machine interface;The utility model effectively prevents filter pool sand leakage, prolongs filter material service life, ensures filter pool processing capacity, avoids quartz sand into ultrafiltration and reverse osmosis system, prolongs the service life of membrane component.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment technology and relates to industrial wastewater membrane treatment systems, specifically a device for preventing sand runoff in a V-type filter bed of an industrial membrane treatment system. Background Technology

[0002] V-type filters in industrial membrane treatment systems are named for the V-shaped inlet tank. They are a type of rapid filter, also known as uniform particle size filter. The filter media used is homogeneous, meaning it has uniform particle size. A six-valve filter has six main valves on various pipelines and typically uses a uniform-particle quartz sand filter layer as a key pretreatment device, primarily used to remove suspended solids and particulate matter from the water to protect the normal operation of subsequent membrane modules. However, V-type filters are prone to sand loss during actual operation, where the quartz sand filter media is lost with the effluent, leading to a reduction in filter layer thickness, decreased filtration efficiency, and even filter malfunction.

[0003] In existing technologies, the following methods are commonly used to reduce sand loss in V-type filters:

[0004] Reducing the filtration rate: Reducing the filtration rate can decrease the scouring effect of the water flow on the filter media, thereby reducing sand loss. However, reducing the filtration rate will reduce the treatment capacity of the filter bed.

[0005] Increasing the thickness of the filter media layer can improve the filter's ability to intercept contaminants and reduce sand runoff. However, increasing the thickness of the filter media layer will increase the construction and operating costs of the filter.

[0006] Improve the filter media: Using high-strength, wear-resistant filter media can reduce media breakage, thereby reducing sand leakage. However, improving the filter media will increase the cost of the media. Utility Model Content

[0007] The purpose of this invention is to provide a device for preventing sand runoff in a V-type filter bed of an industrial membrane treatment system. This device can effectively intercept the filter media lost with the effluent and return it to the filter media layer, preventing sand runoff without affecting the treatment capacity of the filter bed.

[0008] The technical solution adopted by this utility model to achieve the above objectives is as follows:

[0009] A device for preventing sand loss in a V-type filter bed of an industrial membrane treatment system includes an interception net, an interception tank, a filter media return mechanism, and a control system. The interception net is installed at the backwash water outlet of the V-type filter bed. The interception tank is located below the interception net. The filter media return mechanism connects the interception tank and the filter media layer of the V-type filter bed, and transports the quartz sand filter media intercepted in the interception tank back to the filter media layer of the V-type filter bed. The control system includes sensors, a PLC controller, and a human-machine interface. The sensors include a level sensor installed in the interception tank and a flow sensor installed on the return pipe. The human-machine interface is used to set operating parameters and display operating status. The PLC controller is connected to the level sensor, the flow sensor, the return pump, and the human-machine interface.

[0010] Furthermore, the interception net is designed as a detachable structure, made of corrosion-resistant, high-strength stainless steel or engineering plastic, with mesh size slightly smaller than the minimum particle size of the quartz sand filter media.

[0011] Furthermore, the bottom of the interception trough is funnel-shaped, and the trough body is made of wear-resistant material.

[0012] Furthermore, the filter media return mechanism includes a return pipe, a return pump, and a distributor. One end of the return pipe is connected to the bottom of the interception tank, and the other end extends to the top of the filter media layer of the V-shaped filter. The return pump is installed on the return pipe near the outlet of the interception tank. The distributor is installed at the end of the return pipe above the filter media layer. The distributor is designed with a porous structure to evenly distribute the returned quartz sand filter media onto the surface of the filter media layer.

[0013] Furthermore, the return pipe is made of wear-resistant material, the pipe inclination angle is designed to be 8°, and the pipe specification is DN50.

[0014] Furthermore, the reflux pump is a slurry pump or a screw pump, the pump body is made of wear-resistant material, and the pump flow rate and head are matched according to the scale and treatment capacity of the V-type filter.

[0015] Furthermore, the distributor angle is adjustable, making it suitable for different filter media layer thicknesses.

[0016] The beneficial effects of this utility model are:

[0017] 1. Effectively prevents sand loss: By intercepting and recirculating the sand, it effectively prevents the loss of quartz sand filter media and extends the service life of the filter media;

[0018] 2. Maintain the filter bed's processing capacity: The filter bed's processing capacity can be ensured to remain unaffected without reducing the filtration rate or increasing the thickness of the filter media layer.

[0019] 3. The device has a simple structure, is easy to install and maintain, and is inexpensive, making it suitable for large-scale promotion and application.

[0020] 4. Automated operation: The device, combined with the control system, can operate automatically, reducing manual intervention and improving operating efficiency.

[0021] 5. Protect downstream membrane modules: The device prevents quartz sand from entering the ultrafiltration and reverse osmosis systems, extending the service life of the membrane modules. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] In the diagram: 1. Interception net; 2. Interception tank; 3. Backwash outlet; 4. Filter media layer; 5. Return pipe; 6. Return pump; 7. Distributor; 8. Return outlet pipe; 9. PLC controller; 10. Liquid level sensor; 11. Flow sensor. Detailed Implementation

[0024] The preferred embodiments of the present invention will now be described 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.

[0025] A device for preventing sand runoff in a V-type filter bed of an industrial membrane treatment system includes an interception net 1, an interception tank 2, a filter media return mechanism, and a control system. The interception net 1 is installed at the backwash water outlet 3 of the V-type filter bed. The interception net 1 is a detachable structure, made of corrosion-resistant, high-strength stainless steel or engineering plastic, with a mesh size slightly smaller than the minimum particle size of the quartz sand filter media. The interception tank 2 is located below the interception net 1. The interception tank 2 is U-shaped with a funnel-shaped bottom. The tank body is made of wear-resistant material and lined with a 5mm thick polyurethane wear-resistant layer. The filter media return mechanism connects the interception tank 2 and the V-type filter bed. The quartz sand filter media layer 4 of the filter bed transports the quartz sand filter media intercepted in the interception tank 2 back to the quartz sand filter media layer 4 of the V-shaped filter bed. The filter media return mechanism includes a return pipe 5, a return pump 6, and a distributor 7. The return pipe 5 is made of wear-resistant ultra-high molecular weight polyethylene pipe with an 8° inclination angle and a DN50 specification. One end of the return pipe 5 is connected to the bottom of the interception tank 2, and the other end extends above the quartz sand filter media layer 4 of the V-shaped filter bed. The return pump 6 is a slurry pump or a screw pump with a wear-resistant material. The pump flow rate and head are matched according to the scale and processing capacity of the V-shaped filter bed. The return pump 6 is installed on the return pipe 5 near the outlet of the interception tank 2. The distributor 7 is installed on the return outlet pipe 8 at the end of the return pipe 5 above the quartz sand filter media layer 4. The distributor 7 has a porous structure and an adjustable angle to accommodate different filter media layer thicknesses. The distributor 7 evenly distributes the return quartz sand filter media onto the surface of the quartz sand filter media layer 4. The control system includes sensors, a PLC controller 9, and a human-machine interface. The sensors include a level sensor 10 installed in the interception tank 2 and a flow sensor 11 installed on the return pipe 5. The level sensor 10 is an E+H FTL50 level sensor, and the flow sensor 11 is a Krohne OPTIFLUX 2300 flow meter. The human-machine interface is used to set operating parameters (including level threshold, return flow rate, etc.) and display the operating status. The PLC controller 9 is a Siemens S7-1200, which is connected to the level sensor 10, the flow sensor 11, the return pump 6, and the human-machine interface.

[0026] This device uses a PLC controller to achieve automatic program control. When the liquid level sensor 10 of the interception tank 2 senses that the liquid level of the quartz sand filter media in the interception tank 2 is greater than the set maximum threshold, the return pump 6 is started. When the liquid level of the quartz sand filter media is less than the minimum threshold, the return pump 6 stops working. At the same time, the return cycle is set, and the return pump 6 automatically runs the return operation for a set duration at regular intervals. The filter media intercepted by the interception net 1 is intercepted and sinks into the interception tank 2. The return pump 6 sends the quartz sand filter media that has sunk into the interception tank 2 back to the return outlet pipe 8 above the quartz sand filter media layer 4 through the return pipe 5. Then, through the porous structure of the distributor 7, the returned quartz sand filter media is evenly sprinkled on the surface of the quartz sand filter media layer 4, effectively preventing sand loss, extending the service life of the filter media, ensuring the treatment capacity of the filter pool, preventing quartz sand from entering the ultrafiltration and reverse osmosis systems, and extending the service life of the membrane modules.

[0027] The control system can also be set to a maximum threshold for flow fluctuation. When the flow sensor 11 detects that the flow fluctuation exceeds the threshold, an alarm is triggered to remind the operator.

[0028] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A device for preventing sand runoff in a V-type filter bed of an industrial membrane treatment system, characterized in that: The system includes an interception net, an interception tank, a filter media return mechanism, and a control system. The interception net is located at the backwash water outlet of the V-type filter. The interception tank is located below the interception net. The filter media return mechanism connects the interception tank and the filter media layer of the V-type filter, transporting the quartz sand filter media intercepted in the interception tank back to the filter media layer of the V-type filter. The control system includes sensors, a PLC controller, and a human-machine interface. The sensors include a level sensor installed in the interception tank and a flow sensor installed on the return pipe. The human-machine interface is used to set operating parameters and display operating status. The PLC controller is connected to the level sensor, the flow sensor, the return pump of the filter media return mechanism, and the human-machine interface.

2. The device for preventing sand runoff in a V-type filter bed of an industrial membrane treatment system according to claim 1, characterized in that: The interception net is designed as a detachable structure and is made of corrosion-resistant, high-strength stainless steel or engineering plastic. The mesh size is slightly smaller than the minimum particle size of the quartz sand filter media.

3. The device for preventing sand runoff in a V-type filter bed of an industrial membrane treatment system according to claim 1, characterized in that: The interception trough is U-shaped with a funnel-shaped bottom, and the trough body is made of wear-resistant material.

4. The device for preventing sand runoff in a V-type filter bed of an industrial membrane treatment system according to claim 1, characterized in that: The filter media return mechanism includes a return pipe, a return pump, and a distributor. One end of the return pipe is connected to the bottom of the interception tank, and the other end extends to the top of the filter media layer of the V-shaped filter. The return pump is installed on the return pipe near the outlet of the interception tank. The distributor is installed at the end of the return pipe above the filter media layer. The distributor is designed with a porous structure to evenly distribute the returned quartz sand filter media onto the surface of the filter media layer.

5. The device for preventing sand runoff in a V-type filter bed of an industrial membrane treatment system according to claim 4, characterized in that: The return pipe is made of wear-resistant material, the pipe inclination angle is designed to be 8°, and the pipe specification is DN50.

6. The device for preventing sand runoff in a V-type filter bed of an industrial membrane treatment system according to claim 4, characterized in that: The reflux pump is either a slurry pump or a screw pump, and the pump body is made of wear-resistant material. The pump flow rate and head are matched according to the scale and treatment capacity of the V-type filter.

7. The device for preventing sand runoff in a V-type filter bed of an industrial membrane treatment system according to claim 4, characterized in that: The distributor angle is adjustable, making it suitable for different filter layer thicknesses.

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