Recycled water quartz sand filter tank backwash device

Abstract

The utility model discloses a recovery water quartz sand filter tank backflush device belongs to water treatment equipment technical field, including filter jar body, backflush mechanism and recovery water mechanism, backflush mechanism includes differential pressure sensor, and differential pressure sensor monitors the pressure difference of sewage water inlet and clean water outlet, and filter jar body is communicated with the recovery jar of recovery water mechanism through the reuse water pipe, and the clean water outlet of recovery jar and the clean water inlet of backflush mechanism are all communicated to backflush water inlet, and backflush water inlet and air inlet are all communicated water and air distribution device. The utility model discloses a differential pressure sensor realizes the function of grading backflush, reaches the beneficial effect of intelligent operation, high -efficient cleaning and energy saving and consumption reduction, and through recovery water mechanism, reaches the beneficial effect of water resource cyclic utilization, remarkable saving operating cost after recycling and reusing the wastewater.

Description

Technical Field

[0001] This utility model relates to the field of water treatment equipment technology, and in particular to a backwashing device for a quartz sand filter tank for recycled water. Background Technology

[0002] Quartz sand filter tanks, as a mature and efficient filtration device, are used in industrial water treatment, domestic sewage purification and greywater reuse, mainly to remove suspended solids and colloidal impurities from water.

[0003] However, during continuous operation, quartz sand filter media will continuously trap pollutants, leading to filter layer blockage, gradual increase in filtration resistance, and decline in the quality of produced water. In order to restore the performance of the filter tank, the filter media must be backwashed regularly.

[0004] Existing backwashing devices have revealed many shortcomings in practical applications. First, many devices have a single backwashing mode, operating at a constant intensity. This one-size-fits-all approach lacks flexibility. When the filter media is only slightly contaminated, using a high-intensity backwashing mode will result in a large waste of cleaning water and compressed air, significantly increasing energy consumption. Conversely, if a low-intensity mode is always used, the filter media cannot be thoroughly cleaned when it is heavily contaminated, leading to filter media caking, low filtration efficiency, and a shortened equipment lifespan.

[0005] Secondly, the traditional backwashing process generates a large amount of backwashing wastewater. This wastewater, rich in pollutants, is directly discharged, which not only causes a serious waste of precious water resources, but also increases the operating costs and environmental pressure of enterprises.

[0006] Therefore, this utility model proposes a backwashing device for a water-recovery quartz sand filter tank to address the shortcomings of existing technologies. Utility Model Content

[0007] In view of the problems in the existing technology of backwashing devices for recycled water quartz sand filter tanks, such as the single backwashing mode, the inability to adjust the backwashing intensity according to the degree of filter media contamination, resulting in energy consumption and water waste, and the direct discharge of backwashing wastewater causing water resource waste, this utility model aims to provide a backwashing device for recycled water quartz sand filter tanks with an improved structure that can effectively solve the above problems.

[0008] This utility model provides a backwashing device for a quartz sand filter tank for recycling water, including: a filter tank, a backwashing mechanism, and a recycling water mechanism including a recycling tank.

[0009] The filter tank is equipped with a sewage inlet and a clean water outlet; the backwashing mechanism includes a differential pressure sensor, a water and air distribution device, an air inlet, a backwashing inlet, and a clean water inlet.

[0010] Furthermore, the differential pressure sensor is located between the sewage inlet and the clean water outlet; the filter tank is connected to the inlet of the recovery tank via a reclaimed water pipe; the recovery tank is provided with a return water outlet, and the reclaimed water passage formed by the return water outlet and the clean water passage formed by the clean water inlet are both connected to the backwash inlet, and the backwash inlet and the air inlet are both connected to the water and air distribution device.

[0011] Preferably, the top of the water and air distribution device is fixedly connected to multiple nozzles.

[0012] Preferably, a filter screen is fixedly connected to the inner center of the filter tank.

[0013] Preferably, an inclined plate is fixedly connected to the inner bottom of the recycling tank.

[0014] Preferably, a pressure valve is fixedly connected to the top of the recycling tank, a level gauge is fixedly connected to the top right side of the recycling tank, and a drain outlet is fixedly connected to the bottom right side of the recycling tank.

[0015] Preferably, a turbidity sensor is fixedly connected to the recycled water pipe.

[0016] Preferably, a filter is provided upstream of the return water outlet, and a turbidity sensor is fixedly connected downstream of the return water outlet.

[0017] Preferably, the filter is connected to the return water outlet via a threaded connection.

[0018] This utility model has the following beneficial effects:

[0019] 1. This utility model, by setting a differential pressure sensor to monitor the degree of filter media contamination, and linking the backwash inlet, clean water inlet and air inlet, realizes a graded backwashing function that automatically switches between single water flushing and combined air-water backwashing according to different contamination thresholds. It solves the problems of single backwashing mode, energy consumption and water waste in light contamination, and incomplete flushing in heavy contamination in the prior art, and achieves the technical effect of intelligent operation, high efficiency and cleaning and energy saving.

[0020] 2. This utility model introduces backwash wastewater into a recovery tank through a recycled water pipe, and sets up inclined plates in the recovery tank to accelerate sedimentation. The treated water is then filtered and monitored through a filter and a turbidity sensor. Finally, the qualified recovered water is transported back to the backwash inlet. This solves the problem of direct discharge of wastewater and serious waste of water resources caused by existing backwash devices, and achieves the technical effects of water resource recycling, significantly reducing total water consumption and saving operating costs. Attached Figure Description

[0021] Figure 1This is a perspective view of the backwashing device for the recycled water quartz sand filter tank proposed in this utility model;

[0022] Figure 2 This is a front view of the backwashing device for the recycled water quartz sand filter tank proposed in this utility model;

[0023] Figure 3 This is an exploded view of the backwashing mechanism in the backwashing device for the recycled water quartz sand filter tank proposed in this utility model.

[0024] Figure 4 This is an exploded view of the water recovery mechanism in the backwashing device for the quartz sand filter tank for water recovery proposed in this utility model.

[0025] Legend:

[0026] 1. Recycling tank; 2. Filter tank; 3. Recycling water mechanism; 31. Recycled water pipe; 32. Turbidity sensor one; 33. Pressure valve; 34. Inclined plate; 35. Level gauge; 36. Sewage outlet; 37. Return water outlet; 38. Filter; 39. Turbidity sensor two; 4. Backwashing mechanism; 41. Water and air distribution device; 42. Nozzle; 43. Filter screen; 44. Clean water outlet; 45. Sewage inlet; 46. Differential pressure sensor; 47. Air inlet; 48. Backwash inlet; 49. Clean water inlet. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0028] Example:

[0029] Please refer to Figure 1 and Figure 2The backwashing device for the quartz sand filter tank includes a filter tank 2, a backwashing mechanism 4, and a water recovery mechanism 3. The backwashing mechanism 4 is located inside the filter tank 2, and the water recovery mechanism 3 is used to recover backwash wastewater. The filter tank 2 is provided with a sewage inlet 45 and a clean water outlet 44. The backwashing mechanism 4 includes a differential pressure sensor 46, a water and air distribution device 41, an air inlet 47, a backwash water inlet 48, and a clean water inlet 49. The differential pressure sensor 46 is located in the pipeline between the sewage inlet 45 and the clean water outlet 44. Above, differential pressure sensor 46 is used to detect the pressure difference between sewage and clean water; the water recovery mechanism 3 includes a recovery tank 1; the filter tank 2 is connected to the water inlet of the recovery tank 1 through a return water pipe 31; the recovery tank 1 is provided with a return water outlet 37; the recovery water passage formed by the return water outlet 37 and the clean water passage formed by the clean water inlet 49 are both connected to the backwash inlet 48; the backwash inlet 48 and the air inlet 47 are both connected to the water and air distribution device 41; the water and air distribution device 41 is located at the bottom of the inner side of the filter tank 2.

[0030] Please refer to Figure 3 and Figure 4 The water and air distribution device 41 of the backwashing mechanism 4 is fixedly connected to the bottom inner side of the filter tank 2. Multiple nozzles 42 are fixedly connected to the top of the water and air distribution device 41. The nozzles 42 are used to spray air and water upwards. A filter screen 43 is fixedly connected to the middle inner side of the filter tank 2. The filter screen 43 is located above the multiple nozzles 42, and the top of the filter screen 43 is used to place quartz sand, such as... Figure 4 As shown, the return water pipe 31 of the water recovery mechanism 3 is fixedly connected to the top right side of the filter tank 2. A turbidity sensor 32 is fixedly connected to the top of the return water pipe 31. The turbidity sensor 32 is used to detect the turbidity of the backwash water. A pressure valve 33 is fixedly connected to the top of the recovery tank 1. The pressure valve 33 is used to balance the pressure inside the recovery tank 1. An inclined plate 34 is fixedly connected to the bottom inner side of the recovery tank 1. The inclined plate 34 is used to accelerate the settling of suspended solids in the wastewater. A level gauge 35 is fixedly connected to the top right side of the recovery tank 1. A drain outlet 36 is fixedly connected to the bottom right side of the recovery tank 1. The drain outlet 36 is used to discharge the sediment accumulated inside the recovery tank 1. A return water outlet 37 is fixedly connected to the front side of the recovery tank 1. A filter 38 is connected to the middle of the return water outlet 37 by a thread. The filter 38 is a detachable structure. A turbidity sensor 39 is fixedly connected downstream of the return water outlet 37. The turbidity sensor 39 is used to detect whether the filtered backwash water meets the standards.

[0031] As a preferred embodiment, please refer to Figure 3The structure of the backwashing mechanism 4 inside the filter tank 2 is defined in detail. The water and air distribution device 41 of the backwashing mechanism 4 is fixedly connected to the bottom of the inner side of the filter tank 2. Multiple nozzles 42 are fixedly connected to the top of the water and air distribution device 41. The multiple nozzles 42 are evenly distributed and used to spray the medium from the backwash water inlet 48 or air inlet 47 upward to wash the quartz sand. In the middle of the inner side of the filter tank 2, that is, above the multiple nozzles 42, a filter screen 43 is fixedly connected. The filter screen 43 is used to support the quartz sand filter media and prevent the filter media from clogging the clean water outlet 44 during forward filtration. During reverse filtration, water and air flow are allowed to pass through.

[0032] As another preferred embodiment, please refer to Figure 4 The internal structure of the recycling tank 1 of the recycling water mechanism 3 is defined. An inclined plate 34 is fixedly connected to the bottom of the inner side of the recycling tank 1. The inclined plate 34 is preferably inclined to increase the settling area and guide the settling material to slide towards the sewage outlet 36.

[0033] As another preferred embodiment, please refer to Figure 4 The auxiliary components of the recycling tank 1 are defined. A pressure valve 33 is fixedly connected to the top of the recycling tank 1. The pressure valve 33 is used to balance the air pressure inside the recycling tank 1 when water is introduced or drained to prevent excessive positive or negative pressure. A level gauge 35 is fixedly connected to the top right side of the recycling tank 1. The level gauge 35 is used to monitor the amount of wastewater in the recycling tank 1 in real time. A drain outlet 36 is fixedly connected to the bottom right side of the recycling tank 1. The drain outlet 36 is adjacent to the bottom end of the inclined plate 34 and is used to periodically discharge the sludge collected by sedimentation.

[0034] As another preferred embodiment, please refer to Figure 4 The pipeline components of the water recovery mechanism 3 are defined. A turbidity sensor 32 is fixedly connected to the return water pipe 31. A filter 38 is provided in the middle of the return water outlet 37. A turbidity sensor 39 is fixedly connected to the downstream of the return water outlet 37. More preferably, the filter 38 is detachably installed in the pipeline of the return water outlet 37 by means of a threaded connection. This threaded connection structure of the filter 38 makes it easy to disassemble for cleaning, maintenance or replacement when the filter 38 is blocked or damaged.

[0035] Working principle:

[0036] First, the backwashing mechanism 4 is installed. A clean water outlet 44 and a sewage inlet 45 are fixedly connected to the left side of the filter tank 2. A differential pressure sensor 46 is fixedly connected between the clean water outlet 44 and the sewage inlet 45. The differential pressure sensor 46 is used to detect the pressure difference between the sewage and the clean water. A water and air distribution device 41 is fixedly connected to the bottom inside the filter tank 2. Multiple nozzles 42 are fixedly connected to the top of the water and air distribution device 41. An air inlet 47 and a backwash inlet 48 are fixedly connected to the bottom front side of the filter tank 2. A clean water inlet 49 and a return water outlet 37 are fixedly connected to the front side of the backwash inlet 48. The air inlet 47 and the backwash inlet 48 are used to provide air and water flow to the water and air distribution device 41. The air and water flow wash the quartz sand upward through the nozzles 42. A filter screen 43 is fixedly connected to the middle inside the filter tank 2. A large amount of quartz sand is placed on top of the filter screen 43 for filtration.

[0037] Next is the installation of the water recovery mechanism 3. A return water pipe 31 is fixedly connected to the top right side of the filter tank 2. The return water pipe 31 is used to guide the backwash water to the recovery tank 1. A turbidity sensor 32 is fixedly connected to the top of the return water pipe 31. The turbidity sensor 32 is used to detect the turbidity of the backwash water flow. A pressure valve 33 is fixedly connected to the top of the recovery tank 1. The pressure valve 33 can balance the air pressure inside the recovery tank 1. An inclined plate 34 is fixedly connected to the bottom of the recovery tank 1. The inclined plate 34 can accelerate the settling of suspended solids in the wastewater. A level gauge 35 is fixedly connected to the top right side of the recovery tank 1, and a drain outlet 36 is fixedly connected to the bottom right side of the recovery tank 1. The drain outlet 36 is used to discharge the sediment accumulated in the recovery tank 1. A return water outlet 37 is fixedly connected to the front side of the recovery tank 1. A filter 38 is threadedly connected to the middle of the return water outlet 37 to further filter the backwash water. The filter 38 is detachable for easy maintenance and replacement in the future. A turbidity sensor 39 is fixedly connected downstream of the return water outlet 37 to detect whether the filtered backwash water meets the standards.

[0038] During operation, wastewater first enters the filter tank 2 through the sewage inlet 45 and is filtered by the quartz sand on the filter screen 43 in the filter tank 2. The filtered water is discharged through the clean water outlet 44. When the differential pressure sensor 46 detects that the water flow pressure difference between the sewage inlet 45 and the clean water outlet 44 reaches the second set threshold, it indicates that the filter media is slightly contaminated and the quartz sand needs to be backwashed. At this time, the backwash inlet 48 is filled with recycled water filtered from the filter tank 2, which performs a single water wash on the filter tank 2. At this time, the water consumption is low and the energy consumption is low. When the differential pressure sensor 46 detects that the first set threshold is reached, it indicates that the filter media is seriously contaminated. The clean water entering through the clean water inlet 49 and the high-pressure airflow entering through the air inlet 47 perform a combined backwash. At this time, the washing intensity is high and the filter media can be effectively cleaned.

Claims

1. Backwashing device for a water-recovery quartz sand filter tank, including: Filter tank (2); Backwashing mechanism (4); A water recycling mechanism (3) includes a recycling tank (1); Its features are, The filter tank (2) is provided with a sewage inlet (45) and a clean water outlet (44), and the backwashing mechanism (4) includes a differential pressure sensor (46) located between the sewage inlet (45) and the clean water outlet (44). The backwashing mechanism (4) also includes a water and air distribution device (41), an air inlet (47), a backwashing water inlet (48), and a clean water inlet (49). The filter tank (2) is connected to the water inlet of the recycling tank (1) via a water return pipe (31); The recycling tank (1) is provided with a return water outlet (37). The recycling water passage formed by the return water outlet (37) and the clean water passage formed by the clean water inlet (49) are both connected to the backwash inlet (48). The backwash inlet (48) and the air inlet (47) are both connected to the water and air distribution device (41).

2. The backwashing device for the recycled water quartz sand filter tank according to claim 1, characterized in that, The top of the water and air distribution device (41) is fixedly connected to multiple nozzles (42).

3. The backwashing device for the recycled water quartz sand filter tank according to claim 1, characterized in that, A filter screen (43) is fixedly connected to the middle of the inner side of the filter tank (2).

4. The backwashing device for the recycled water quartz sand filter tank according to claim 1, characterized in that, An inclined plate (34) is fixedly connected to the bottom inner side of the recycling tank (1).

5. The backwashing device for the recycled water quartz sand filter tank according to claim 1 or 4, characterized in that, A pressure valve (33) is fixedly connected to the top of the recycling tank (1), a level gauge (35) is fixedly connected to the top right side of the recycling tank (1), and a drain outlet (36) is fixedly connected to the bottom right side of the recycling tank (1).

6. The backwashing device for the recycled water quartz sand filter tank according to claim 1, characterized in that, A turbidity sensor (32) is fixedly connected to the recycled water pipe (31).

7. The backwashing device for the recycled water quartz sand filter tank according to claim 1, characterized in that, A filter (38) is provided in the middle of the return water outlet (37), and a turbidity sensor (39) is fixedly connected to the downstream of the return water outlet (37).

8. The backwashing device for the recycled water quartz sand filter tank according to claim 7, characterized in that, The filter (38) is connected to the return water outlet (37) by a thread.

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