Filter material interception drainage tank of sulfur autotrophic denitrification filter

Abstract

The utility model belongs to the technical field of drainage tanks, and particularly relates to a filter material interception drainage tank of a sulfur autotrophic denitrification filter tank, which comprises a filter tank main body, a group of water and gas distribution devices are mounted at the bottom of the filter tank main body, and a filter material layer is laid on the upper layers of the water and gas distribution devices. Three groups of backwashing drainage grooves are formed in the upper layer of the filter material layer close to the inner area of the filter main body opening; inner side baffles are installed on the two sides of the backwashing drainage tank, outer side baffles are arranged on the other sides of the inner side baffles, bottom baffles are arranged at the bottoms of the outer side baffles, one sides of the bottom baffles are connected with the bottom of the ventilation pipe, and the two ends of the backwashing drainage tank are each provided with a height adjusting device. Backwashing sewage and wastewater circulate through two paths, scum and garbage floating objects floating on the water surface of the filter tank can smoothly flow out along the first path and do not stay in the filter tank for a long time, and frequent backwashing of the filter tank is avoided; meanwhile, the problem that drainage is not smooth due to the fact that the filter material interception speed reduction module is blocked by floating objects is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of drainage troughs, and in particular relates to a drainage trough for intercepting filter material of a sulfur autotrophic denitrification filter tank. Background Art

[0002] At present, sulfur autotrophic denitrification filter tanks basically adopt traditional heterotrophic denitrification deep bed filters, but local designs need to be improved. The present invention mainly solves the engineering problem of filter material loss during air-water combined backwashing of sulfur autotrophic denitrification filter tanks.

[0003] The operating conditions of the sulfur autotrophic denitrification filter are different from those of the traditional denitrification deep bed filter. The filter media of the denitrification deep bed filter is quartz sand, and denitrification is achieved by adding an external organic carbon source as an electron donor. At this time, the physical structure of the quartz sand particles will not change. As mentioned above, the filter media of the sulfur autotrophic denitrification filter will gradually be consumed, that is, from large particles (generally 2-6 mm particles) to small particles until they flow out with the backwash effluent. Therefore, the current sulfur autotrophic denitrification filter is not the best choice if it is directly introduced into the heterotrophic deep bed filter. It is necessary to improve the technical point of how to prevent the loss of small particles of sulfur autotrophic filter media to reduce the frequency of replenishment of sulfur autotrophic filter media by sewage treatment plant operators, thereby further reducing the investment cost of deep denitrification.

[0004] Although the patent "A high-strength backwash drainage trough with filter material retention (CN 103845930 B)" has made some partial improvements, there are still some disadvantages, such as ① the problem of poor drainage: the backwash wastewater can only be discharged from the reserved gap between components 105 and 106. When the backwash water volume is large, the drainage will be poor, resulting in the filter tank liquid level rising or even overflowing, and the backwash wastewater contains a large amount of floccules and floating objects, which may block component 103, causing drainage paralysis; ② surface sweeping cannot be achieved: the height of component 106 is significantly higher than that of component 104, that is, the backwash drainage is completely discharged from the reserved gap between components 105 and 106. Because it is applied to the sewage filter, a large amount of scum and even solid floating objects will gather on the upper surface of the filter (even more serious in open-air filter, due to garbage blown into the filter by wind). These scum and floating objects cannot be discharged into the backwash trough through surface sweeping, and are retained on the upper surface of the filter for a long time, affecting the water permeability, and finally causing the liquid level to rise sharply and the filter tank to be frequently backwashed. Utility Model Content

[0005] The utility model aims to provide a filter material interception drainage trough for a sulfur autotrophic denitrification filter, aiming to solve the problem that a large amount of scum and even solid floating objects will gather on the upper surface of the filter tank (more serious in open-air filter tanks due to garbage blown into the filter tank by wind) due to the application of the prior art to sewage filter tanks. These scum and floating objects cannot be discharged into the backwash tank through surface sweeping and washing, and are retained on the upper surface of the filter tank for a long time, affecting the permeability of the water, and finally causing a sharp rise in the liquid level and frequent backwashing of the filter tank.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a sulfur autotrophic denitrification filter media interception drainage trough, comprising a filter tank body, a group of water and air distribution devices are installed at the bottom of the filter tank body, a filter material layer is laid on the upper layer of the water and air distribution device, and three groups of backwash drainage troughs are installed on the upper layer of the filter material layer near the inner area of ​​the filter tank body opening;

[0007] Inner baffles are installed on both sides of the backwash drainage trough, an outer baffle is provided on the other side of the inner baffle, a bottom baffle is provided at the bottom of the outer baffle, a filter material retention and speed reduction module is installed between the inner baffle and the outer baffle, one side of the bottom baffle is connected to the bottom of the ventilation pipe, and a group of height adjustment devices are respectively installed at both ends of the backwash drainage trough.

[0008] As a filter material retention drainage trough of a sulfur autotrophic denitrification filter tank of the utility model, preferably, the filter material retention and speed reduction module is arranged between the inner baffle and the outer baffle, and the filter material retention and speed reduction module is composed of a 1.5 mm thick SS304 steel sheet, the top height is 150 mm lower than the top of the inner baffle, the interior is designed in an "S" shape curve, and the linear distance between adjacent steel sheets is 100 mm.

[0009] As a sulfur autotrophic denitrification filter tank filter material retention drainage trough of the utility model, preferably, the outer baffle is made of SS304 material, connected to the inner baffle through a horizontal support, the outer baffle is fixed and installed parallel to the inner baffle, and the outer baffle is perpendicular to the horizontal plane), and the top of the outer baffle is folded at 90°.

[0010] As a sulfur autotrophic denitrification filter material retention drainage trough of the utility model, preferably, the lower part of the outer baffle adopts a 30° bend to form a certain distance with the bottom baffle, and the distance is controlled between 50mm and 150mm; at the same time, the top of the outer baffle is 30mm to 50mm lower than the top of the inner baffle.

[0011] As a filter material retention drainage trough of a sulfur autotrophic denitrification filter tank of the utility model, preferably, the bottom baffle is directly connected to the inner baffle to form an opening and closing angle of 120°, and the lower end of the bottom baffle adopts a 60° folding edge with a folding edge length of 50 mm.

[0012] As a sulfur autotrophic denitrification filter media retention drainage trough of the utility model, preferably, the bottom of the ventilation pipe is connected to the bottom baffle and penetrates the bottom baffle, with a diameter of DN25, an arrangement spacing of 2000mm, and a vertical installation; the top of the ventilation pipe adopts a 90° design, the ventilation pipe release port is bent in the direction of the backwash drainage trough, and the bottom elevation of the ventilation pipe is 30mm higher than the top of the inner baffle.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The backwash wastewater flows through two paths. The floating scum and garbage floating objects on the water surface of the filter tank can flow out smoothly along path one (path one: the wastewater crosses the top of the outer baffle, then passes through the top of the filter material interception and speed reduction module, and finally passes through the top of the inner baffle to reach the backwash drain tank, and finally discharged from the filter tank system). It will not stay in the filter tank for a long time, avoiding frequent backwashing of the filter tank; at the same time, it solves the problem of poor drainage caused by floating objects clogging the filter material interception and speed reduction module. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the backwash drainage tank of the utility model;

[0017] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0018] Figure 3 It is a side view structural schematic diagram of the utility model;

[0019] Figure 4 It is a structural schematic diagram of the backwash drainage trough of the utility model arranged in the filter tank body.

[0020] In the figure: 1. backwash drain trough; 2. inner baffle; 3. outer baffle; 4. bottom baffle; 5. ventilation pipe; 6. filter material retention and speed reduction module; 7. height adjustment device; 8. filter tank body; 9. water and air distribution device; 10. filter material layer. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-4 The utility model provides the following technical solutions: a sulfur autotrophic denitrification filter material interception drainage trough, comprising a filter body 8, a group of water and air distribution devices 9 are installed at the bottom of the filter body 8, a filter material layer 10 is laid on the upper layer of the water and air distribution device 9, and three groups of backwash drainage troughs 1 are installed on the upper layer of the filter material layer 10 near the inner area of ​​the opening of the filter body 8;

[0023] An inner baffle 2 is installed on both sides of the backwash drain trough 1, an outer baffle 3 is arranged on the other side of the inner baffle 2, a bottom baffle 4 is arranged at the bottom of the outer baffle 3, a filter material interception and speed reduction module 6 is installed between the inner baffle 2 and the outer baffle 3, one side of the bottom baffle 4 is connected to the bottom of the ventilation pipe 5, and a set of height adjustment devices 7 are respectively installed at both ends of the backwash drain trough 1. The height adjustment device 7 is located at both ends of the backwash drain trough 1, and the horizontality of the backwash drain trough 1 is controlled by adjusting the length of the threaded screw to ensure that the backwash drain trough 1 can be installed horizontally and drain water at equal flow along the length direction of the backwash drain trough 1.

[0024] The parts 1-9 in the technical solution are assembled to form a filter tank drainage trough.

[0025] The air and water flow through the filter material layer 10 in reverse from bottom to top, and the filter material layer 10 is sheared and flushed by the air and water. The flushed wastewater flows out upward through the drainage trough of the filter pool.

[0026] Preferably: the filter material retention and speed reduction module 6 is arranged between the inner baffle 2 and the outer baffle 3. The filter material retention and speed reduction module 6 is made of 1.5mm thick SS304 steel sheet. The top height is 150mm lower than the top of the inner baffle 2. The interior is designed in an "S" shape curve, and the linear distance between adjacent steel sheets is 100mm.

[0027] When in use, the backwash wastewater and the small-particle sulfur autotrophic filter media it carries will slow down when flowing through the filter tank drain trough, and the filter media will fall back to the filter tank under the action of the "S" curve hitting the wall, thereby achieving the purpose of intercepting the filter media.

[0028] Preferably: the outer baffle plate 3 is made of SS304 material and is connected to the inner baffle plate 2 through a lateral support. The outer baffle plate 3 is fixed and installed parallel to the inner baffle plate 2, that is, the inner baffle plate 2 and the outer baffle plate 3 are both perpendicular to the horizontal plane. The top of the outer baffle plate 3 is folded at 90° for structural reinforcement, so as to obtain a longer structural size without causing large deformation.

[0029] Preferably, the lower part of the outer baffle plate 3 is bent at 30° to form a certain distance with the bottom baffle plate 4, and the distance is controlled between 50mm and 150mm; at the same time, the top of the outer baffle plate 3 is 30mm to 50mm lower than the top of the inner baffle plate 2, which can ensure that the scum and garbage floating objects on the surface of the filter tank flow smoothly out to the backwash drainage trough 1.

[0030] Preferably: the bottom baffle 4 is directly connected to the inner baffle 2 to form an opening and closing angle of 120°. The lower end of the bottom baffle 4 adopts a 60° fold with a fold length of 50 mm. On the one hand, it can be used to strengthen the structure of the component in the length direction, and on the other hand, it is used to intercept air in the gas-water combined backwashing wastewater.

[0031] Preferably: the bottom of the vent pipe 5 is connected to the bottom baffle 4 and penetrates the bottom baffle 4, with a diameter of DN25, an arrangement spacing of 2000mm, and is installed vertically; the top of the vent pipe 5 adopts a 90° design, and the release port of the vent pipe 5 is bent in the direction of the backwash drain trough 1. The bottom elevation of the vent pipe 5 is 30mm higher than the top of the inner baffle 2. Such a design can be used to pass the backwash gas trapped underwater by the bottom baffle 4 to the atmosphere, reduce the air integration into the filter material retention and speed reduction module 6, and facilitate the sedimentation of the filter material inside the filter material retention and speed reduction module 6. At the same time, the release of the trapped backwash gas can help the scum and garbage floating objects on the surface of the filter tank to quickly flow into the backwash drain trough 1, thereby increasing the intensity of surface sweeping and at the same time increasing the design width of the filter tank.

[0032] Sulfur autotrophic filter media will not flow out in large quantities with the backwash wastewater, because the backwash wastewater is discharged into two channels of the drainage trough:

[0033] Passage 1: The wastewater crosses the top of the outer baffle 3, passes through the top of the filter material interception and speed reduction module 6, and finally reaches the backwash drain trough 1 through the top of the inner baffle 2, and finally discharges from the filter tank system; the sulfur autotrophic fine particle filter material carried by the backwash wastewater will be decelerated and circulated at the top of the filter material interception and speed reduction module 6 (because the top height is 150mm lower than the top of the inner baffle 2, the flow channel becomes larger and the flow rate is reduced), that is, the fine particle filter material will settle in this section, avoiding the loss of the filter material;

[0034] Passage 2: The wastewater flows in reverse direction through the gap between the outer baffle plate 3 and the bottom baffle plate 4 into the filter material interception and deceleration module 6, and finally reaches the backwash drainage tank 1 through the top of the inner baffle plate 2, and is finally discharged from the filter tank system; the filter material interception and deceleration module 6 is designed to be an "S"-shaped curve inside, and the backwash wastewater and the small-particle sulfur autotrophic filter material carried by it will be decelerated when flowing through this device, and the filter material will fall back to the filter tank under the action of the "S"-shaped curve hitting the wall, so as to achieve the purpose of intercepting the filter material;

[0035] The backwashing wastewater flows through two paths, and the floating scum and garbage floating objects on the water surface of the filter tank can flow out smoothly along the path 1 (path 1: the wastewater crosses the top of the outer baffle 3, then passes through the top of the filter material interception and speed reduction module 6, and finally passes through the top of the inner baffle 2 to reach the backwash drainage trough 1, and finally discharged from the filter tank system), and will not stay in the filter tank for a long time, avoiding frequent backwashing of the filter tank; at the same time, it solves the problem of poor drainage caused by floating objects blocking the filter material interception and speed reduction module 6;

[0036] The surface sweeping function of the filter tank can be realized or strengthened. The bottom of the ventilation pipe 5 is connected to the bottom baffle 4 and penetrates the bottom baffle 4. The diameter is DN25, the arrangement spacing is 2000mm, and it is installed vertically. The top adopts a 90° design, and the release port is bent in the direction of the backwash drainage trough 1. The elevation of the bottom of the pipe is 30mm higher than the top of the inner baffle 2. Such a design can be used to pass the backwashing gas trapped underwater by the bottom baffle 4 to the atmosphere, reduce the air integration into the filter material retention and speed reduction module 6, and facilitate the sedimentation of the filter material inside the filter material retention and speed reduction module 6. At the same time, the release of the trapped backwashing gas can help the scum and garbage floating objects on the surface of the filter tank to quickly flow into the backwash drainage trough 1, so that the intensity of surface sweeping can be increased, and the design width of the filter tank can be increased at the same time.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A sulfur autotrophic denitrification filter media interception drainage trough, comprising a filter body (8), a group of water and air distribution devices (9) are installed at the bottom of the filter body (8), and a filter material layer (10) is laid on the upper layer of the water and air distribution device (9), characterized in that: Three groups of backwash drainage grooves (1) are installed in the upper layer of the filter material layer (10) near the inner area of ​​the opening of the filter tank body (8); Inner baffles (2) are installed on both sides of the backwash drainage trough (1), an outer baffle (3) is arranged on the other side of the inner baffle (2), a bottom baffle (4) is arranged at the bottom of the outer baffle (3), a filter material interception and speed reduction module (6) is installed between the inner baffle (2) and the outer baffle (3), one side of the bottom baffle (4) is connected to the bottom of the ventilation pipe (5), and a set of height adjustment devices (7) are respectively installed at both ends of the backwash drainage trough (1).

2. The sulfur autotrophic denitrification filter material interception drainage trough according to claim 1, characterized in that: The filter material retention and speed reduction module (6) is arranged between the inner baffle plate (2) and the outer baffle plate (3). The filter material retention and speed reduction module (6) is made of a 1.5 mm thick SS304 steel sheet, the top height of which is 150 mm lower than the top of the inner baffle plate (2), the interior is designed in an "S"-shaped curve form, and the linear distance between adjacent steel sheets is 100 mm.

3. The sulfur autotrophic denitrification filter material interception drainage trough according to claim 1, characterized in that: The outer baffle (3) is made of SS304 material and is connected to the inner baffle (2) via a lateral support. The outer baffle (3) is fixed and installed parallel to the inner baffle (2). The inner baffle (2) and the outer baffle (3) are both perpendicular to a horizontal plane. The top of the outer baffle (3) is folded at 90°.

4. The sulfur autotrophic denitrification filter material interception drainage trough according to claim 1, characterized in that: The lower part of the outer baffle (3) is bent at 30° to form a certain distance with the bottom baffle (4), and the distance is controlled between 50mm and 150mm; at the same time, the top of the outer baffle (3) is 30mm to 50mm lower than the top of the inner baffle (2).

5. The sulfur autotrophic denitrification filter material interception drainage trough according to claim 1, characterized in that: The bottom baffle (4) is directly connected to the inner baffle (2) to form an opening and closing angle of 120°. The lower end of the bottom baffle (4) is folded at 60° with a fold length of 50 mm.

6. The sulfur autotrophic denitrification filter material interception drainage trough according to claim 1, characterized in that: The bottom of the vent pipe (5) is connected to the bottom baffle (4) and penetrates the bottom baffle (4), has a diameter of DN25, an arrangement spacing of 2000 mm, and is installed vertically; the top of the vent pipe (5) adopts a 90° design, the release port of the vent pipe (5) is bent in the direction of the backwash drainage trough (1), and the bottom elevation of the vent pipe (5) is 30 mm higher than the top of the inner baffle (2).

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