Partitioned gas combined water washing biological filter backwashing device

Abstract

The application relates to a partitioned gas combined water washing biological filter backwashing device, which comprises a shell, a water distribution mechanism, a filter plate and a partitioned gas distributor. The shell is internally provided with a cavity. The bottom of the cavity is provided with the water distribution mechanism. The filter plate is arranged above the water distribution mechanism. The filter plate is spliced by a plurality of unit filter plates. A plurality of filter heads are arranged on the filter plate. The filter heads penetrate the filter plate. A filter material layer is arranged above the filter plate and is used for filling filter material. The partitioned gas distributor is arranged above the filter plate. The partitioned gas distributor is arranged above the splicing joint of every four adjacent unit filter plates. The application provides the partitioned gas combined water washing biological filter backwashing device. The device is assisted by partitioned gas lifting, the bottom filter material is fully flowed and loosened, and deep cleaning is achieved.

Description

Technical Field

[0001] This application relates to the field of water treatment, and in particular to a biological filter backwashing device with zoned gas-water washing. Background Technology Biological filters are one of the earliest and most widely used technologies in wastewater treatment. Their main principle is to utilize the biofilm on the surface of the filter media to degrade pollutants in wastewater, thereby purifying the water source. However, during prolonged use, a large amount of impurities and aged biofilm will adhere to the surface of the filter media. If not cleaned in time, this will lead to a decrease in the treatment efficiency of the biological filter. Therefore, after long-term operation, backwashing is necessary to remove impurities and aged biofilm from the surface of the filter media.

[0002] Currently, common backwashing methods mainly employ single water washing or combined air-water washing. These methods utilize water flow shearing and friction, air shearing and friction, and collisions and friction between filter media particles to remove deposits from the filter media surface. However, these methods consistently suffer from incomplete filter media loosening, leading to uneven backwashing. Summary of the Invention

[0003] In view of this, this application proposes a biological filter backwashing device that combines zoned gas and water washing. This device uses zoned air lifting to allow the bottom filter material to flow and loosen fully, achieving deep cleaning.

[0004] In one possible implementation, this application provides a biological filter backwashing device with zoned gas combined with water washing, which includes: a shell, a water distribution mechanism, a filter plate and a zoned gas distributor; The housing has an internal cavity; the water distribution mechanism is located at the bottom of the cavity; The filter plate is positioned above the water distribution mechanism; the filter plate is composed of several unit filter plates; the filter plate is provided with several filter heads; the filter heads penetrate the filter plate; The filter media layer, disposed above the filter plate, is used to fill the filter media; and, The zoned gas distributor is located above the filter plate; a zoned gas distributor is provided above the joint of every four adjacent unit filter plates.

[0005] In one possible implementation, the partitioned gas distributor includes: A shroud, which is a vertically arranged sealed cylinder with an internal cavity; the bottom of the shroud is provided with a lower connecting pipe, which can draw filter media into the shroud; the top of the shroud is provided with an upper connecting pipe, which can discharge the filter media from the shroud; and, An air intake pipe extends from the side of the fairing into the interior of the fairing, enabling gas to be delivered into the fairing and discharged from the upper connecting pipe; the air outlet of the air intake pipe is provided with an air distribution pipe.

[0006] In one possible implementation, the lower connecting pipe and the shroud are embedded within the filter media layer; the outlet of the upper connecting pipe is located above the filter media layer.

[0007] In one possible implementation, the center of the cross-section of the air inlet of the air inlet is on the same straight line as the axis of the upper connecting pipe, so that the air discharged from the air inlet is directly blown into the upper connecting pipe.

[0008] In one possible implementation, the center of the cross-section of the air inlet of the air inlet is located on the axis of the fairing; the axes of the upper connecting pipe, the lower connecting pipe, and the fairing are on the same straight line.

[0009] In one possible implementation, the air inlet pipe is connected to an air lift fan via an air lift pipe; the air lift pipe is equipped with an air lift valve.

[0010] In one possible implementation, the water distribution mechanism is connected to a water inlet pipe; the water inlet pipe is equipped with a water inlet valve; the water distribution mechanism is connected to a backwash water inlet pipe; the backwash water inlet pipe is equipped with a backwash water inlet valve.

[0011] In one possible implementation, a water outlet pipe is provided above the housing; a water outlet valve is provided on the water outlet pipe; a backwash drain pipe is provided above the housing; and a backwash drain valve is provided on the backwash drain pipe.

[0012] In one possible implementation, the device further includes a timing controller; the timing controller is electrically connected to the inlet valve, the backwash inlet valve, the air lift valve, the outlet valve, and the backwash drain valve, respectively.

[0013] In one possible implementation, the filter media layer contains filter media; the thickness of the filter media is 1~2m.

[0014] The beneficial effects of this utility model are as follows: This device is equipped with multiple zoned gas distributors in the filter media layer. One zoned gas distributor is set above the splicing joint of every four adjacent unit filter plates. This can divide the filter media layer into multiple independent air-lift zones. By using independent gas distribution pipes and air-lift nozzles, the filter media can be fully flowed and loosened in local areas. Combined with the timing controller, the air-lift zones are switched in sequence, which realizes the uniform loosening of the entire filter media layer. In conjunction with the water washing system, it can perform deep cleaning of the filter media and effectively remove impurities and aging biofilm from the surface of the filter media.

[0015] Other features and aspects of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0016] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this application together with the specification and serve to explain the principles of this application.

[0017] Figure 1 This diagram shows the main structure of the biological filter backwashing device with zoned gas combined with water washing according to an embodiment of this application; Figure 2 This diagram shows a schematic of the filter plate structure according to an embodiment of this application; Figure 3 This invention provides a schematic diagram of the structure of a zoned gas distributor according to an embodiment of the present application. Figure 4 A schematic diagram of the timing controller according to an embodiment of this application is shown.

[0018] The components are as follows: 1. Shell, 2. Filter plate, 21. Filter head, 22. Unit filter plate, 3. Filter media layer, 31. Filter media, 4. Zoned gas distributor, 41. Rectifier, 42. Air inlet pipe, 421. Air distribution pipe, 422. Air inlet valve, 43. Upper connecting pipe, 44. Lower connecting pipe, 45. Air lift pipe, 451. Air lift valve, 46. Air lift fan, 5. Water distribution mechanism, 51. Water inlet pipe, 511. Water inlet valve, 52. Water outlet pipe, 521. Water outlet valve, 53. Backwash water inlet pipe, 531. Backwash water inlet valve, 54. Backwash drain pipe, 541. Backwash drain valve, 6. Sequence controller. Detailed Implementation

[0019] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0020] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0023] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0024] Figure 1 , Figure 2 , Figure 3 and Figure 4 This diagram shows the main structure of a biological filter backwashing device with zoned gas-water combined washing according to an embodiment of this application. Figure 1 , Figure 2 and Figure 3 As shown, it includes: a housing 1, a water distribution mechanism 5, a filter plate 2, and a zoned gas distributor 4; The shell 1 has an internal cavity; a water distribution mechanism 5 is provided at the bottom of the cavity 1; The filter plate 2 is positioned above the water distribution mechanism 5; the filter plate 2 is composed of several unit filter plates 22 spliced ​​together; the filter plate 2 is provided with several filter heads 21; the filter heads 21 penetrate the filter plate 2; Filter media layer 3 is disposed above the filter plate 2 and is used to fill filter media 31; A zoned gas distributor 4 is disposed above the filter plate 2; a zoned gas distributor 4 is disposed above the joint of every 4 adjacent unit filter plates 22.

[0025] The filter plate disclosed in this utility model is composed of several unit filter plates spliced ​​together. This modular design makes the installation process more flexible, and the size of the filter tank can be adjusted according to actual needs. At the same time, if a unit filter plate fails, it can be disassembled and replaced individually without replacing all the filter plates, thus reducing maintenance costs and downtime.

[0026] This utility model discloses a zoned gas distributor located above the filter plate in the filter media layer. In actual use, filter media is accumulated on the filter plate, and the zoned gas distributors are evenly arranged within the filter media in the filter media layer. They are arranged such that a zoned gas distributor is located above the joint of every four adjacent unit filter plates. Each zoned gas distributor processes the same range of filter media, thus dividing the filter media in the filter media layer into multiple zones. During backwashing, each zoned gas distributor operates independently, enabling the filter media to flow and loosen within a localized area. This, combined with backwashing, removes impurities adhering to the surface of the filter media.

[0027] In one possible implementation, the partitioned gas distributor 4 includes: The shroud 41 is a vertically arranged sealed cylinder with an internal cavity; the bottom of the shroud 41 is provided with a lower connecting pipe 44, which can draw filter material into the shroud 41; the top of the shroud 41 is provided with an upper connecting pipe 43, which can discharge the filter material 31 inside the shroud 41. The air intake pipe 42 extends from the side of the fairing 41 into the interior of the fairing 41, and can send gas into the fairing 41 and discharge it from the upper connecting pipe 43; the air outlet of the air intake pipe 42 is provided with an air distribution pipe 421.

[0028] This utility model discloses the structure of a zoned gas distributor, such as... Figure 3 As shown, the shroud is the core component, employing a vertically positioned sealed cylinder design. Filter media is drawn in through the bottom connecting pipe and discharged through the top connecting pipe, forming a continuous airlift circulation. After entering through the inlet pipe, the gas mixes with the filter media and carries it upwards, achieving rapid loosening of the filter media in certain areas.

[0029] This utility model discloses that the air outlet of the air inlet pipe is provided with an air distribution pipe, wherein the air distribution pipe can evenly disperse the gas into the interior of the rectifier, avoiding excessive local airflow that could cause filter material to splash or uneven air lifting.

[0030] In one possible implementation, the lower connecting pipe 44 and the rectifier 41 are embedded in the filter layer 3; the outlet of the upper connecting pipe 43 is located above the filter layer 3.

[0031] This utility model discloses the extension lengths of the upper and lower connecting pipes of a zoned gas distributor; wherein the lower connecting pipe is used to draw in filter media, and the upper connecting pipe is used to discharge the filter media. Therefore, it is necessary to ensure that the outlet of the upper connecting pipe extends to the outside of the filter media, so that the filter media can be discharged smoothly.

[0032] It is worth noting that the upper connecting pipe of the zoned gas distributor only needs to extend 2-3 cm beyond the surface of the filter media. It does not need to be extended too far, which would cause the filter media to be discharged outside the biological filter and result in filter media loss.

[0033] In one possible implementation, the center of the cross-section of the air outlet of the air inlet pipe 42 is on the same straight line as the axis of the upper connecting pipe 43, so that the air discharged from the air inlet pipe 42 is directly blown into the upper connecting pipe 43.

[0034] In one possible implementation, the center of the cross-section of the air outlet of the air inlet pipe 42 is located on the axis of the fairing 41; the axes of the upper connecting pipe 43, the lower connecting pipe 44, and the fairing 41 are on the same straight line.

[0035] This utility model discloses the optimal structure of a zoned gas distributor, such as... Figure 3 As shown, the lower connecting pipe is responsible for drawing in the filter media, and the upper connecting pipe is responsible for discharging the filter media. Both are collinear with the axis of the shroud, ensuring that the filter media circulates along a vertical path under the airlift action, reducing energy loss. In addition, this design can also prevent filter media accumulation: the outlet of the upper connecting pipe is located above the filter media layer, avoiding filter media accumulation inside the shroud and ensuring the backwashing effect of the device.

[0036] In one possible implementation, the air inlet pipe 42 is connected to the air lift fan 46 via the air lift pipe 45; the air lift pipe 45 is provided with an air lift valve 451.

[0037] The present invention discloses several zoned gas distributors, each with a separate and independent air inlet pipe. All air inlet pipes are connected to the gas lift pipe, thereby enabling each zoned gas distributor to work independently.

[0038] In one possible implementation, the water distribution mechanism 5 is connected to a water inlet pipe 51; the water inlet pipe 51 is equipped with a water inlet valve 511; the water distribution mechanism 5 is connected to a backwash water inlet pipe 53; the backwash water inlet pipe 53 is equipped with a backwash water inlet valve 531.

[0039] In one possible implementation, a water outlet pipe 52 is provided above the housing 1; a water outlet valve 521 is provided on the water outlet pipe 52; a backwash drain pipe 545 is provided above the housing 1; and a backwash drain valve 541 is provided on the backwash drain pipe 4.

[0040] In one possible implementation, the device further includes a timing controller 6; the timing controller 6 is electrically connected to the inlet water valve 511, the backwash inlet water valve 531, the air lift valve 451, the outlet water valve 20, and the backwash drain valve 541, respectively.

[0041] In one possible implementation, an intake pipe valve 422 is provided on the intake pipe 42; the intake pipe valve 422 is electrically connected to the timing controller 6.

[0042] In one possible implementation, the filter media layer 3 is provided with filter media 31; the filter media 31 is selected from one or more of quartz sand, activated carbon and ceramic filter media; the thickness of the filter media is 1~2m.

[0043] In one possible implementation, the number of zoned gas distributors 4 is 4 to 8.

[0044] In one possible implementation, the gas flow rate of the zoned gas distributor 4 is 10~20 L / (m³). 2 ·s).

[0045] In one possible implementation, the backwash flow rate is 5~10L (m³). 2 •s); backwashing time is 5~10min; the running time of each zone gas distributor 4 is 1~2min.

[0046] The device disclosed in this utility model, during the backwashing process, controls the inlet water valve, backwash inlet water valve, air lift valve, outlet valve, and backwash drain valve through a timing controller to achieve alternating air lift and backwashing in different zones. Furthermore, the timing controller can also control the running time of air lift and water washing by controlling the opening and closing of the valves. Moreover, an air inlet valve can be installed on the air inlet pipe, electrically connected to the timing controller. If the loosening degree of the filter media in a certain zone of the filter media layer is unqualified, the timing controller can control the air inlet valve in that zone to loosen the filter media in that zone individually, thereby achieving a good loosening effect of the filter media inside the filter media layer, and thus improving the effect of removing impurities attached to the surface of the filter media.

[0047] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A biological filter backwashing device with zoned gas-water washing, characterized in that, It includes: Shell, water distribution mechanism, filter plate and zoned gas distributor; The housing has an internal cavity; the water distribution mechanism is located at the bottom of the cavity; The filter plate is positioned above the water distribution mechanism; the filter plate is composed of several unit filter plates; the filter plate is provided with several filter heads; the filter heads penetrate the filter plate; A filter media layer, disposed above the filter plate, is used to fill the filter media; and, The zoned gas distributor is located above the filter plate; a zoned gas distributor is provided above the joint of every four adjacent unit filter plates.

2. The biological filter backwashing device with zoned gas-water washing according to claim 1, characterized in that, The zoned gas distributor includes: a shroud, an upper connecting pipe, a lower connecting pipe, an air inlet pipe, and an air distribution pipe; The shroud is a vertically arranged sealed cylinder with an internal cavity; the bottom of the shroud is provided with the lower connecting pipe, which can draw filter material into the shroud; the top of the shroud is provided with the upper connecting pipe, which can discharge the filter material from the shroud. The air intake pipe is connected to the shroud from the side, and can send gas into the shroud and discharge it from the upper connecting pipe. The air distribution pipe is located at the air outlet of the air inlet pipe.

3. The biological filter backwashing device with zoned gas-water washing according to claim 2, characterized in that, The lower connecting pipe and the rectifier are embedded in the filter material layer; the outlet of the upper connecting pipe is located above the filter material layer.

4. The biological filter backwashing device with zoned gas-water washing according to claim 3, characterized in that, The center of the cross-section of the air inlet of the air inlet pipe is on the same straight line as the axis of the upper connecting pipe, so that the air discharged from the air inlet pipe is directly blown into the upper connecting pipe.

5. The biological filter backwashing device with zoned gas-water washing according to claim 4, characterized in that, The center of the cross-section of the air inlet of the air inlet is located on the axis of the fairing; the axis of the upper connecting pipe, the axis of the lower connecting pipe and the axis of the fairing are on the same straight line.

6. The biological filter backwashing device with zoned gas-water washing according to claim 5, characterized in that, The air inlet pipe is connected to the air lift fan via an air lift pipe; the air lift pipe is equipped with an air lift valve.

7. The biological filter backwashing device with zoned gas-water washing according to claim 6, characterized in that, The water distribution mechanism is connected to a water inlet pipe; the water inlet pipe is equipped with a water inlet valve; the water distribution mechanism is connected to a backwash water inlet pipe; the backwash water inlet pipe is equipped with a backwash water inlet valve.

8. The biological filter backwashing device with zoned gas-water washing according to claim 7, characterized in that, A water outlet pipe is provided above the housing; a water outlet valve is provided on the water outlet pipe; a backwash drain pipe is provided above the housing; a backwash drain valve is provided on the backwash drain pipe.

9. The biological filter backwashing device with zoned gas-water washing according to claim 8, characterized in that, The device also includes a timing controller; the timing controller is electrically connected to the inlet valve, the backwash inlet valve, the air lift valve, the outlet valve, and the backwash drain valve, respectively.

10. The biological filter backwashing device with zoned gas-water washing according to claim 1, characterized in that, The filter media layer contains filter media; the thickness of the filter media is 1~2m.

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