Filter material loss prevention device and system

Abstract

The utility model discloses a filter material loss prevention device and system, and belongs to the technical field of sewage treatment. The filter material anti-loss device comprises a water outlet groove, a fixed baffle, a movable baffle and a limiting piece, the fixed baffle is fixedly connected with the water outlet groove through a connecting piece, the movable baffle is rotatably installed at the top edge and the bottom edge of the fixed baffle through a hinge piece and can swing along with flowing of liquid, and the limiting piece is arranged on the outer side of the movable baffle and can rotate relative to the fixed baffle. And the movable baffle is limited to swing within a set angle range. According to the utility model, the loss of the filter material is effectively prevented, the influence of the filter material on the effluent quality and subsequent treatment facilities is reduced, and the device is particularly suitable for the backwashing of the aeration filter and is more suitable for the normal application scene of the aeration filter.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a filter material loss prevention device and system. Background Art

[0002] Aeration filter is a commonly used process in sewage treatment. The filter media filled in the filter can filter out a large amount of suspended solids in the sewage and adsorb and remove some pollutants. The type and amount of filter media are important factors that determine the removal effect of the filter.

[0003] In wastewater treatment, aeration filters are categorized into upflow and downflow types based on the direction of water flow. Upflow aeration filters are the most widely used. To ensure sufficient contact area between the filter media and the wastewater, the filter media used in these filters are characterized by small, lightweight particles, such as ceramsite and activated carbon.

[0004] Currently, the outlet troughs in upflow aeration filters are typically located at the edge or a higher position in the center of the tank. Upflowing wastewater overflows into the outlet trough after being filtered by the filter media and then discharged from the tank. However, conventional outlet troughs have the following disadvantages:

[0005] 1. Serious filter media loss increases the cost of sewage treatment. When both air and water flow upward, lightweight filter media will rise with the bubbles and overflow into the outlet tank with the water flow and be discharged. This causes filter media loss. If appropriate measures are not taken to intercept this loss, filter media must be continuously replenished to ensure sewage treatment effectiveness, thereby increasing sewage treatment costs.

[0006] Second, the filter media interception method is simple and the interception effect is unsatisfactory. In existing filter tanks, the commonly used method to prevent filter media leakage is to add a small-diameter filter screen at the outlet. The filter screen is usually made of plastic or metal. However, because sewage contains a large amount of corrosive substances and suspended solids, it is easy to cause filter screen clogging or corrosion, requiring regular replacement or manual cleaning, which increases the labor burden.

[0007] In order to effectively overcome the above-mentioned shortcomings of the outlet trough, the patent involved in publication number CN111068375A (hereinafter referred to as the basic patent) discloses a filter material interception device and system, which changes the flow direction of the upward flow at the outlet channel by arranging a baffle on the outside of the outlet channel, so that the filter material rising with the upward flow is blocked and sinks back to the bottom of the filter tank to achieve the reuse of the filter material. However, when the aeration gas volume or the upward flow water volume is large, especially when the filter material is backwashed, the upward flow velocity is large and a large intensity of turbulence will be generated at the edge of the baffle, which will still cause some filter material to enter the outlet channel, resulting in the inability to effectively prevent the loss of filter material under the condition of large turbulence. Utility Model Content

[0008] The purpose of the utility model is to provide a filter material loss prevention device and system to solve the technical problems described in the background technology.

[0009] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0010] A filter material loss prevention device, comprising:

[0011] A water outlet trough is fixedly arranged in the filter tank and is used to receive and discharge sewage treated by the filter material and sewage generated after backwashing the filter material;

[0012] A fixed baffle, the fixed baffle being obliquely arranged on the outside of the water outlet trough and fixed to the water outlet trough by a connecting piece, the fixed baffle being used to change the flow direction of the liquid rising at the water outlet trough so that the filter material rising with the liquid is blocked and sinks, the top end of the fixed baffle being inclined toward the side away from the water outlet trough, and the top end of the fixed baffle being lower than the top edge of the water outlet trough;

[0013] A movable baffle, which is rotatably mounted on the top and bottom edges of the fixed baffle via hinges and is capable of swinging with the flow of the liquid; and

[0014] A limiting member, which is arranged on the outside of the movable baffle and is used to limit the movable baffle from swinging within a predetermined angle range;

[0015] Among them, in the top view direction, the distribution range of the water outlet trough all falls within the distribution range of the fixed baffle and the movable baffle, and the filter material can fall back to the bottom of the filter tank along the gaps between the fixed baffles, the gaps between the fixed baffles and the water outlet trough, the gaps between the movable baffles and the movable baffles, and the gaps between the movable baffles and the water outlet trough.

[0016] Preferably, the movable baffle includes an upper movable baffle and a lower movable baffle, the upper movable baffle is rotatably mounted on the top edge of the fixed baffle through a hinge, and the lower movable baffle is rotatably mounted on the bottom edge of the fixed baffle through a hinge, the limit member is arranged corresponding to the movable baffle, the limit member at the upper movable baffle is horizontally arranged on the side close to the top surface of the upper movable baffle, one end of which is fixed on the hinge and cannot be rotated, and the other end extends toward the side away from the water outlet, and the limit member at the lower movable baffle is arranged on the side close to the bottom surface of the lower movable baffle, one end of which is fixed on the hinge and cannot be rotated, and the other end extends toward the side close to the water outlet, and its free end is lower than the hinge end.

[0017] Preferably, the limiting member is a rod-shaped structure.

[0018] Preferably, a plurality of water-permeable holes are provided on the lower movable baffle at intervals.

[0019] Preferably, the opening rate of the water-permeable holes on the lower movable baffle is between 30% and 50%.

[0020] Preferably, a first water outlet and a second water outlet are provided on the end wall of the water outlet trough, the first water outlet is used to discharge sewage treated by the filter material, and the second water outlet is used to discharge sewage generated after backwashing, and the cross-sectional size of the second water outlet is larger than the cross-sectional size of the first water outlet.

[0021] In addition, the present invention also provides a filter material loss prevention system, comprising any one of the filter material loss prevention devices described above.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention adds a movable baffle through a hinged part on the basis of a fixed baffle, and ensures that the movable baffle can swing to a certain extent with the rising water flow, thereby converting the mechanical energy of the rising water flow into the mechanical energy of the movable baffle, reducing the turbulence intensity of the rising water flow, and then facilitating the filter material floated by the air flow and water flow to settle back to the bottom of the filter tank under the action of gravity, rather than entering the water outlet trough for reuse. At the same time, the swing of the movable baffle can also shake off the filter material deposited on the baffle, so that it falls back to the bottom of the filter tank to avoid siltation on the baffle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or other aspects and advantages of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings. These drawings are only illustrative and do not limit the present invention, wherein:

[0024] Figure 1 This is a structural diagram of a filter material loss prevention device and system involved in the utility model;

[0025] Figure 2 This is a structural diagram of the lower movable baffle involved in the utility model.

[0026] Figure numerals: 1. water outlet level; 2. filter tank; 3. filter material; 4. water outlet trough; 5. first fixed baffle; 6. connecting member; 7. hinged member; 8. first upper movable baffle; 9. first lower movable baffle; 10. second fixed baffle; 11. second upper movable baffle; 12. second lower movable baffle; 13. limiting member; 14. water permeable hole; 15. first water outlet; 16. second water outlet. DETAILED DESCRIPTION

[0027] Hereinafter, an embodiment of a filter material loss prevention device and system of the present invention will be described with reference to the accompanying drawings. The embodiments described herein are specific embodiments of the present invention and are used to illustrate the concept of the present invention. They are all illustrative and exemplary and should not be construed as limiting the implementation methods and scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims and description of this application, including technical solutions that adopt any obvious replacements and modifications to the embodiments described herein.

[0028] In the description of the present invention, it should be noted that the terms "front," "back," "left," "right," "top," "bottom," "upper," "lower," "inner," "outer," "horizontal," "vertical," "upright," and "oblique" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] The accompanying drawings in this specification are schematic diagrams that assist in illustrating the concepts of the present invention and schematically illustrate the shapes of the various components and their interrelationships. Please note that to clearly illustrate the structures of the various components of the embodiments of the present invention, the drawings are not drawn to the same scale. The same reference numerals are used to indicate the same parts.

[0030] The following describes the principles and features of the present invention in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention. Figure 1-2 , the preferred embodiments of the present invention are further described in detail:

[0031] like Figure 1 As shown, a preferred filter material loss prevention system of the present invention includes a filter tank 2 and a filter material loss prevention device arranged in the filter tank 2, wherein the filter material loss prevention device specifically includes:

[0032] The outlet trough 4 is fixedly arranged in the filter tank 2, and the top notch 4 thereof is flush with the outlet water level 1 of the filter tank 2 (after the system is stably operated, the outlet water level 1 of the filter tank 2 will naturally stabilize to the top notch of the outlet trough 4 for water outlet), and is used to receive and discharge sewage treated by the filter material 3 and sewage generated after backwashing the filter material 3;

[0033] A fixed baffle, which is arranged obliquely on the outside of the water outlet trough 4 and fixed to the water outlet trough 4 by a connecting piece 6. The fixed baffle is used to change the flow direction of the rising liquid at the water outlet trough 4 so that the filter material 3 rising with the liquid is blocked and sinks. The top of the fixed baffle is inclined toward the side away from the water outlet trough 4 and its top is lower than the top edge of the water outlet trough 4;

[0034] A movable baffle, which is rotatably mounted on the top and bottom edges of the fixed baffle via hinges 7 (such as hinges or hinges) and can swing with the flow of the liquid; and

[0035] A limiter 13 is provided on the outside of the movable baffle and is used to limit the movable baffle from swinging within a predetermined angle range;

[0036] The cross section of the water outlet trough 4 is an arc or polygon, and there is no right angle at the bottom of the water outlet trough 4. The structural design of the water outlet trough 4 with this cross section increases the space between the water outlet trough 4 and the baffle, which can make the filter material 3 fall more quickly. Moreover, this design makes it difficult for the filter material 3 to adhere to the outer wall of the water outlet trough 4. Even if some of the filter material 3 adheres to the outer wall of the water outlet trough 4, it is easily affected by the flow of sewage and falls off the outer wall of the water outlet trough 4 into the sewage and falls back to the bottom of the filter tank 2, thereby realizing the reuse of the filter material 3. When the system is running, when the upward flow sewage carrying the filter material 3 flows to the water outlet trough 4, due to the blocking effect of the fixed baffle and the movable baffle, the filter material 3 lacks the upward power and sinks under the action of its own gravity, so that it will not enter the water outlet trough 4 and be lost.

[0037] When the outlet trough 4 is set in the middle of the filter tank 2, a first fixed baffle 5 and a second fixed baffle 10 are respectively provided on the left and right sides of the outlet trough 4, and the top ends of the first fixed baffle 5 and the second fixed baffle 10 are both lower than the notch of the outlet trough 4 to ensure that the sewage on the outside of the two can flow smoothly into the outlet trough 4. In order to obtain the best anti-loss effect of the filter material 3, the height difference between the top end of the fixed baffle and the top edge of the outlet trough 4 can be selected and adjusted accordingly according to the actual engineering conditions. The first fixed baffle 5 is inclined to the left, that is, the distance between the top end of the plate body and the axis of the outlet trough 4 is greater than the distance between the bottom end of the plate body and the axis of the outlet trough 4. The second fixed baffle 10 is inclined to the right, that is, the distance between the top end of the plate body and the axis of the outlet trough 4 is greater than the distance between the bottom end of the plate body and the axis of the outlet trough 4. The distance between the bottom end of the plate body and the axis of the water outlet trough 4, the inclined design of the fixed baffle increases the interception area of ​​the fixed baffle for the filter material 3 and improves the anti-loss effect. The vertically rising filter material 3 sinks after encountering the inclined fixed baffle and re-enters the treated sewage. On the other hand, the filter material 3 falling into the fixed baffle and between the fixed baffle and the water outlet trough 4 can slide better along the inclined surface into the sewage in the filter tank 2. The combined effect of the above two aspects ensures that the filter material 3 on both sides of the fixed baffle falls back into the system without entering the water outlet trough 4. In order to better intercept and facilitate the sliding of the filter material 3, the angle between the fixed baffle and the horizontal plane is preferably 45 to 60 degrees. The top and bottom ends of the first fixed baffle 5 are hinged with the first upper movable baffle 8 and The first lower movable baffle 9, the first upper movable baffle 8 is suspended in a vertical state when not impacted by water flow, and a limiting member 13 is fixedly provided on the hinge 7 between the first upper movable baffle 8 and the first fixed baffle 5. This limiting member 13 is set horizontally, one end of which is fixed on the hinge 7 and will rotate with the rotation of the hinge 7 and always maintain a horizontal setting state, and the other end extends toward the side away from the water outlet 4 (i.e., the left side) and is located on the movable route of the first upper movable baffle 8 to limit the first upper movable baffle 8 so that the maximum upper swing height of the first upper movable baffle 8 does not exceed the top edge height of the first fixed baffle 5. A limiting member 13 is also fixedly provided on the hinge 7 between the first lower movable baffle 9 and the first fixed baffle 5. This limiting member 13 is tilted, one end of which is fixed on the hinge 7 and rotates with the rotation of the hinge 7 to always maintain the designed setting state, and the other end extends toward the side close to the water outlet 4 (i.e., the right side) and is located on the movable route of the first lower movable baffle 9 to limit the first lower movable baffle 9, and the free end of this limiting member 13 is tilted obliquely downward, that is, the height of the free end of this limiting member 13 is lower than the height of its hinged end, so that the first lower movable baffle 8 can tilt downward when it is at the maximum swing position, so that the filter material 3 attached thereto can slide smoothly from its plate body and will not accumulate here. Similarly, the second upper movable baffle 11 and the second lower movable baffle 12 hinged at the top and bottom ends of the second fixed baffle 10 are also limited by the limiting member 13.In order to ensure that the upward-flowing sewage will not flow directly along the gap between the baffle and the outlet trough 4 to the notch position of the outlet trough 4 carrying the filter material 3 without being intercepted by the baffle, in the overhead direction, the distribution range of the outlet trough 4 all falls within the distribution range of the fixed baffle and the movable baffle. For this reason, the bottom end elevations of the first fixed baffle 5 and the second fixed baffle 10 should be set in a high-low staggered form to ensure that the first lower movable baffle 9 and the second lower movable baffle 12 extending oppositely can have an overlapping area in the horizontal direction, and the lower movable baffle can directly The filter material 3 that floats below is prevented from continuing to float up and enter the water outlet trough 4, and it can also swing a certain amplitude along with the rising water flow, converting the mechanical energy of the rising water flow into its own mechanical energy, thereby reducing the turbulence intensity of the rising water flow and preventing the floating filter material 3 from continuing to float up and enter the water outlet trough 4. At the same time, the swing of the lower movable baffle can also shake the filter material 3 settled on the lower movable baffle back into the system without entering the water outlet trough 4. The combined effect of the above three aspects ensures that the floating filter material 3 below the anti-loss device falls back into the system without entering the water outlet trough 4.

[0038] When the outlet trough 4 is arranged on one side of the filter tank 2, the wall of the filter tank 2 will play the role of a baffle on one side. To this end, it is only necessary to normally arrange the upper movable baffle, fixed baffle, lower movable baffle and limit member 13 on the side away from the wall of the filter tank 2 on the basis of the baffles on both sides. On the side close to the wall of the filter tank 2, the upper movable baffle and fixed baffle can be directly omitted. Only the movable baffle is directly hinged on the wall of the filter tank 2 through the hinge 7 and the limit member 13 is correspondingly arranged.

[0039] In order to ensure that the filter material 3 between the baffle and the water outlet trough 4 can smoothly fall back to the bottom of the filter tank 2 for reuse, the gap between the baffle and the water outlet trough 4 needs to be designed specifically to ensure that the filter material 3 can fall back to the bottom of the filter tank 2 along the gap between the fixed baffles, the gap between the fixed baffles and the water outlet trough 4, the gap between the movable baffles and the movable baffles, and the gap between the movable baffle and the water outlet trough 4;

[0040] In order to avoid the problem that the filter material 3 is deposited and stuck in the gap between the movable baffle and the limiting member 13, thereby reducing the swing angle range of the movable baffle, in some preferred embodiments, the limiting member 13 is a rod-shaped structure to reduce the deposition area of ​​the filter material 3 particles on the limiting member 13. Among them, the limiting member 13 is preferably a corrosion-resistant rigid cylindrical rod. It should be noted that at this time, in order to ensure that the limiting member 13 fully exerts its stable limiting effect, the limiting members 13 are preferably arranged in several groups at intervals along the extension direction of the baffle;

[0041] Considering that the water flow rate is high during backwashing, the lower movable baffle swings up and down more violently. At this time, due to the swing of the lower movable baffle, turbulence will also be generated, causing the filter material 3 to move up along the channel between the outlet trough 4 and the baffle. In order to deal with this problem, Figure 2 As shown, in some preferred embodiments, the lower movable baffle is provided with a plurality of water permeable holes 14 at intervals, and the opening rate of the water permeable holes 14 on the lower movable baffle is between 30% and 50% (that is, the opening area accounts for 30% to 50% of the total area of ​​the lower movable baffle), wherein the water permeable holes 14 can be various shapes such as circular or polygonal, and the size of the water permeable holes 14 can be larger than the particle size of the filter material 3 or smaller than the particle size of the filter material 3. The function of the water permeable holes 14 is to effectively reduce the violent impact disturbance of the water flow and airflow on the lower movable baffles on both sides during backwashing, while not affecting the effect of reducing the turbulence intensity of the rising water flow, and the water flow on both sides of the lower movable baffle is cut by the lower movable baffle, and its turbulence intensity can be effectively reduced. When the size of the water permeable holes 14 is larger than the particle size of the filter material 3, even if the filter material 3 passes through the lower movable baffle, due to the reduction of the turbulence intensity of the rising water flow, the filter material 3 passing through the lower movable baffle will sink and will not float up into the water outlet trough 4;

[0042] Since the water quality of the effluent during backwashing is poor, if the treated sewage and backwash water are discharged directly through the same drain outlet, it may cause the water quality of some effluent to be substandard. For this reason, in some preferred embodiments, a first water outlet 15 and a second water outlet 16 are opened on the trough wall at the end of the outlet trough 4. The first water outlet 15 is used to discharge the sewage treated by the filter material 3, and the second water outlet 16 is used to discharge the sewage generated after backwashing. The backwash sewage discharged from the second water outlet 16 is discharged through a special pipe for further treatment. The cross-sectional size of the second water outlet 16 is larger than the cross-sectional size of the first water outlet 15. Under normal circumstances, if actual conditions permit, the second water outlet 16 should be set at the bottom end of the outlet trough 4 to ensure that the backwash sewage can be discharged. In actual operation, when normally receiving and discharging the sewage treated by the filter material 3, the first water outlet 15 is opened and the second water outlet 16 is closed. When backwashing is performed, the first water outlet 15 is closed and the second water outlet 16 is opened.

[0043] The setting of the movable baffle can effectively reduce the turbulence intensity during backwashing. Ultimately, through the cooperation of the movable baffle and the fixed baffle, the floating filter material 3 is returned to the filter tank 2 system through the synergistic effect of direct interception, reduction of turbulence intensity, swing energy consumption and swing separation, effectively preventing the loss of filter material 3 and reducing the impact of filter material 3 on effluent water quality and subsequent treatment facilities.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A filter material loss prevention device, characterized in that: include: a water outlet trough (4), the water outlet trough (4) being fixedly arranged in the filter tank (2) and being used for receiving and discharging sewage treated by the filter material (3) and sewage generated after backwashing the filter material (3); a fixed baffle, the fixed baffle being arranged obliquely on the outside of the water outlet trough (4) and being fixed to the water outlet trough (4) via a connecting piece (6); the fixed baffle being used to change the flow direction of the liquid rising at the water outlet trough (4) so ​​that the filter material (3) rising with the liquid is blocked and sinks; the top end of the fixed baffle is inclined toward a side away from the water outlet trough (4), and the top end of the fixed baffle is lower than the top edge of the water outlet trough (4); A movable baffle, which is rotatably mounted on the top and bottom edges of the fixed baffle via a hinge (7) and is capable of swinging with the flow of the liquid; and A limiting member (13), the limiting member (13) being arranged outside the movable baffle and used to limit the movable baffle from swinging within a predetermined angle range; Wherein, in the top view direction, the distribution range of the water outlet trough (4) all falls within the distribution range of the fixed baffle and the movable baffle, and the filter material (3) can fall back to the bottom of the filter tank (2) along the gaps between the fixed baffles, the gaps between the fixed baffles and the water outlet trough (4), the gaps between the movable baffles and the movable baffles, and the gaps between the movable baffles and the water outlet trough (4).

2. The filter material loss prevention device according to claim 1, characterized in that: The movable baffle comprises an upper movable baffle and a lower movable baffle, the upper movable baffle is rotatably mounted on the top edge of the fixed baffle through a hinge (7), and the lower movable baffle is rotatably mounted on the bottom edge of the fixed baffle through a hinge (7), the limiting member (13) is arranged corresponding to the movable baffle, the limiting member (13) at the upper movable baffle is horizontally arranged on a side close to the top surface of the upper movable baffle, one end of which is fixed on the hinge (7) and cannot be rotated, and the other end extends toward a side away from the water outlet trough (4), and the limiting member (13) at the lower movable baffle is arranged on a side close to the bottom surface of the lower movable baffle, one end of which is fixed on the hinge (7) and cannot be rotated, and the other end extends toward a side close to the water outlet trough (4), and the free end thereof is lower than the hinge end.

3. The filter material loss prevention device according to claim 1, characterized in that: The limiting member (13) is a rod-shaped structure.

4. The filter material loss prevention device according to claim 2, characterized in that: A plurality of water-permeable holes (14) are provided on the lower movable baffle at intervals.

5. The filter material loss prevention device according to claim 4, characterized in that: The opening rate of the water-permeable holes (14) on the lower movable baffle is between 30% and 50%.

6. The filter material loss prevention device according to claim 1, characterized in that: A first water outlet (15) and a second water outlet (16) are provided on the end wall of the water outlet trough (4); the first water outlet (15) is used to discharge sewage treated by the filter material (3); the second water outlet (16) is used to discharge sewage generated after backwashing; the cross-sectional size of the second water outlet (16) is larger than the cross-sectional size of the first water outlet (15).

7. A filter material loss prevention system, characterized by: The invention comprises a filter material anti-loss device according to any one of claims 1 to 6.

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