Denitrification filter tank

Abstract

The denitrification filter tank comprises a tank body and denitrification filler, a water inlet and a water outlet are formed in the two opposite sides of the tank body respectively, sewage to be treated can flow into the tank body through the water inlet and then flow out of the tank body through the water outlet, and the height of the water outlet is adjustable. The water level difference between the water inlet and the water outlet is adjustable; the denitrification filler is arranged in the tank body and is used for carrying out denitrification treatment on sewage flowing through the tank body. As the height of the water outlet of the denitrification filter tank is adjustable, when the denitrification filter tank is operated on site and the denitrification filter tank cannot operate normally due to unreasonable head loss design, an operator can adjust the height of the water outlet of the denitrification filter tank; the water level difference between the water inlet and the water outlet, namely the designed head loss of the denitrification filter tank, is flexibly adjusted to cope with various different conditions, so that the designed head loss can be matched with the actual head loss, and the normal operation of the denitrification filter tank is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of water treatment, and particularly relates to a denitrification filter tank. Background Art

[0002] For a traditional denitrification filter tank, when sewage flows through the denitrification filler disposed in the tank body, the blocking effect of the denitrification filler on the water body will cause a head loss of the water body. Since the blocking effects of denitrification fillers with different particle sizes and different types on the water body are different, the resulting head losses will also be different. Therefore, when designing a denitrification filter tank, corresponding different design head losses will be set for different denitrification fillers. However, this design head loss is an empirical value and is often not accurate. Therefore, if the heights of the water inlet and the water outlet are fixed during the design of the denitrification filter tank, making the design head loss non-adjustable, when the design head loss is less than the actual head loss, the water inlet level will be higher than the designed level, and there will be a risk of water overflow in the tank body; at the same time, when the design head loss is greater than the actual head loss, the water level at the water inlet end of the tank body will be relatively low, resulting in the denitrification filler in the tank body not being completely immersed in the water body, thus failing to achieve the effective denitrification treatment effect of the sewage. Summary of the Utility Model

[0003] Based on this, it is necessary to provide a denitrification filter tank with an adjustable water level difference between the water inlet and the water outlet.

[0004] A denitrification filter tank includes:

[0005] A tank body, with a water inlet and a water outlet respectively disposed on opposite sides of the tank body. The sewage to be treated can flow into the tank body through the water inlet and then flow out of the tank body through the water outlet. The height of the water outlet is adjustable to make the water level difference between the water inlet and the water outlet adjustable; and

[0006] Denitrification filler, disposed in the tank body, for denitrifying the sewage flowing through it.

[0007] In one embodiment, the water outlet includes a water outlet pipe, which includes a horizontal water outlet pipe section and a vertical water outlet pipe section. The inlet end of the horizontal water outlet pipe section extends into the pool body through the side of the pool body far from the water inlet, the outlet end of the horizontal water outlet pipe section is located outside the pool body, the vertical water outlet pipe section is located inside the pool body, the inlet end of the vertical water outlet pipe section is above the outlet end of the vertical water outlet pipe section, the outlet end of the vertical water outlet pipe section is detachably connected to the inlet end of the horizontal water outlet pipe section. The water flowing out of the denitrification filler can sequentially flow into the vertical water outlet pipe section through the inlet end of the vertical water outlet pipe section, then sequentially flow into the horizontal water outlet pipe section through the outlet end of the vertical water outlet pipe section and the inlet end of the horizontal water outlet pipe section, and then flow out of the pool body from the outlet end of the horizontal water outlet pipe section. The length of the vertical water outlet pipe section is adjustable so that the height of the inlet end of the vertical water outlet pipe section is adjustable.

[0008] In one embodiment, the horizontal water outlet pipe section and the vertical water outlet pipe section are connected by an arc transition.

[0009] In one embodiment, a water outlet grid is provided at the water outlet.

[0010] In one embodiment, a mixing area and a filler area are provided in the pool body and are sequentially distributed along the length direction or the width direction of the pool body; the water inlet is provided in the mixing area; the water outlet is provided in the filler area; the sewage to be treated flows in from the water inlet and sequentially passes through the mixing area and the filler area and flows out of the pool body from the water outlet, and the denitrification filler is arranged in the filler area.

[0011] In one embodiment, a sludge discharge area is provided at the bottom of the filler area, and the sludge discharge area slopes obliquely downward from the first side of the filler area to the second side of the filler area.

[0012] In one embodiment, the denitrification filler is a sulfur autotrophic denitrification filler, and the sulfur autotrophic denitrification filler is used for sulfur autotrophic denitrification treatment of the flowing sewage.

[0013] In one embodiment, an anti-flushing aeration pipe is further included. The anti-flushing aeration pipe is arranged in the pool body and is located at the bottom of the denitrification filler, and the anti-flushing aeration pipe is used for performing aeration and backwashing operations on the denitrification filler.

[0014] In one embodiment, a gas distribution member is further included. The gas distribution member is arranged in the pool body and is sleeved outside the anti-flushing aeration pipe, and the gas distribution member is used for expanding the aeration volume and aeration intensity of the anti-flushing aeration pipe.

[0015] In one embodiment, the backwashing aeration pipe and at least one air distribution member sleeved outside the backwashing aeration pipe together form an aeration backwashing assembly. There are multiple groups of the aeration backwashing assemblies, and the multiple groups of the aeration backwashing assemblies are arranged at intervals in the pool body.

[0016] Since the height of the water outlet of the denitrification filter is adjustable, when it is found during on-site operation of the denitrification filter that the denitrification filter cannot operate normally due to unreasonable designed head loss, the operator can adjust the height of the water outlet of the denitrification filter to flexibly adjust the water level difference between the water inlet and the water outlet, that is, the designed head loss of the denitrification filter, to cope with various different situations, so that the designed head loss and the actual head loss can match, thereby ensuring the normal operation of the denitrification filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a cross-sectional view of a denitrification filter in one embodiment;

[0019] Figure 2 It is a cross-sectional view of the denitrification filter from another perspective in one embodiment;

[0020] Figure 3 It is a schematic structural diagram of the air distribution member of the denitrification filter in one embodiment;

[0021] Figure 4 It is a schematic structural diagram of the air distribution member of the denitrification filter from another perspective in one embodiment;

[0022] Figure 5 It is a combined view of the backwashing aeration pipe and the air distribution member of the denitrification filter in one embodiment;

[0023] Figure 6 For Figure 5 the enlarged schematic view at A in

[0024] Figure 7 It is a schematic structural diagram of the denitrification filter assembly in one embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, the directional indications will also change accordingly.

[0027] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, "and / or" throughout the text includes three scenarios. Taking A and / or B as an example, it includes the technical solution of A, the technical solution of B, and the technical solution that both A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0028] As Figure 1 and Figure 2 shown, the present application provides a denitrification filter 10, which includes a tank body 100 and denitrification fillers 200. An inlet 110 and an outlet 120 are respectively arranged on opposite sides of the tank body 100. The sewage to be treated can flow into the tank body 100 through the inlet 110 and then flow out of the tank body 100 from the outlet 120. The height of the outlet 120 is adjustable so that the water level difference between the inlet 110 and the outlet 120 is adjustable. The denitrification fillers 200 are arranged in the tank body 100 and are used for denitrifying the sewage flowing through to convert nitrate nitrogen in the sewage into nitrogen gas, thereby realizing the denitrification treatment of the sewage.

[0029] Specifically, the head loss refers to the loss of mechanical energy of a unit mass of liquid during the movement of water flow. The designed head loss is usually defined as the water level difference between the inlet end and the outlet end. Since the height of the outlet 120 of the denitrification filter 10 is adjustable, when it is found during the on-site operation of the denitrification filter 10 that the denitrification filter 10 cannot operate normally due to unreasonable designed head loss, the operator can adjust the height of the outlet 120 of the denitrification filter 10 to flexibly adjust the water level difference between the inlet 110 and the outlet 120, that is, the designed head loss of the denitrification filter 10, so as to cope with various different situations, make the designed head loss match the actual head loss, and thus ensure the normal operation of the denitrification filter 10.

[0030] As Figure 1 shown, the outlet 120 includes a water outlet pipe 121. The water outlet pipe 121 includes a horizontal water outlet pipe section 122 and a vertical water outlet pipe section 123. The inlet end of the horizontal water outlet pipe section 122 extends into the pool body 100 from the side of the pool body 100 far away from the inlet 110. The outlet end of the horizontal water outlet pipe section 122 is located outside the pool body 100. The vertical water outlet pipe section 123 is located inside the pool body 100. The inlet end of the vertical water outlet pipe section 123 is above the outlet end of the vertical water outlet pipe section 123. The outlet end of the vertical water outlet pipe section 123 is detachably connected to the inlet end of the horizontal water outlet pipe section 122. The water flowing out of the denitrification filler 200 can flow into the vertical water outlet pipe section 123 through the inlet end of the vertical water outlet pipe section 123 in sequence, then flow into the horizontal water outlet pipe section 122 through the outlet end of the vertical water outlet pipe section 123 and the inlet end of the horizontal water outlet pipe section 122 in sequence, and then flow out of the pool body 100 from the outlet end of the horizontal water outlet pipe section 122. The length of the vertical water outlet pipe section 123 is adjustable so that the height of the inlet end of the vertical water outlet pipe section 123 is adjustable. With such a setting, when it is necessary to adjust the height of the outlet 120, the operator only needs to replace the vertical water outlet pipe section 123 with a suitable length, effectively improving the convenience of adjusting the height of the outlet 120 of the denitrification filter 10.

[0031] Further, the water outlet pipe 121 can be a PVC pipe, and the horizontal water outlet pipe section 122 and the vertical water outlet pipe section 123 are connected by an arc transition. Further, the outlet 120 is provided with a water outlet grid 140. On the one hand, the water outlet grid 140 can prevent the dirt outside the pool body 100 from entering the pool body 100 to pollute the water body, and at the same time, it can also prevent the denitrification filler 200 in the pool body 100 from flowing out of the pool body 100, so as to avoid the loss of the denitrification filler 200. Specifically, the water outlet grid 140 is arranged at the inlet port of the vertical water outlet pipe section 123.

[0032] As Figure 2As shown in the figure, a preparation area 101 and a packing area 102 which are connected and communicated are arranged in the pool body 100, and the preparation area 101 and the packing area 102 are arranged in sequence along the length direction or the width direction of the pool body 100; a water inlet 110 is arranged in the preparation area 101; a water outlet 120 is arranged in the packing area 102; the sewage to be treated flows in from the water inlet 110, and successively passes through the preparation area 101 and the packing area 102 and flows out of the pool body 100 from the water outlet 120, and the denitrification packing 200 is arranged in the packing area 102.

[0033] Specifically, on the one hand, the preparation area 101 can be used for guiding and distributing the sewage, so that the sewage can further flow through the denitrification packing 200 along a specified path. At the same time, the preparation area 101 also has the functions of sludge discharge and maintenance, so as to timely discharge the sludge deposited in the denitrification filter tank 10 and perform maintenance on the denitrification filter tank 10.

[0034] As Figure 1 and Figure 2 shown in the figure, further, a partition plate 103 is arranged in the pool body 100, and the partition plate 103 divides the internal space of the pool body 100 into a preparation area 101 and a packing area 102. Further, a water passing port 104 is arranged on the partition plate 103, the water passing port 104 communicates the preparation area 101 and the packing area 102, and the water passing port 104 is located below the water outlet 120. Specifically, the water passing port 104 is arranged at the bottom of the partition plate 103.

[0035] Specifically, the sewage to be treated flows into the preparation area 101 through the water inlet 110, the preparation area 101 guides and distributes the sewage, and then the sewage in the preparation area 101 enters the packing area 102 through the water passing port 104. Since the water passing port 104 is located below the water outlet 120, the sewage can flow through the denitrification packing 200 from bottom to top and then flow out of the pool body 100 from the water outlet 120. During the process of the sewage flowing through the denitrification packing 200, the nitrate nitrogen in the sewage is converted into nitrogen gas. Since the flow direction of the sewage is consistent with the diffusion direction of the nitrogen gas, the sewage in the denitrification filter tank 10 flows upward with the nitrogen gas, effectively avoiding the accumulation of nitrogen gas inside the denitrification packing 200 and preventing the denitrification packing 200 from being blocked, thereby prolonging the operation cycle of the denitrification filter tank 10 and reducing the operation cost of the denitrification filter tank 10.

[0036] As Figure 2 shown in the figure, further, a sludge discharge area 700 is arranged at the bottom of the packing area 102, and the sludge discharge area 700 slopes downward obliquely from the first side of the packing area 102 to the second side of the packing area 102. Specifically, the first side of the packing area 102 is the side of the packing area 102 far from the preparation area 101, and the second side of the packing area 102 is the side of the packing area 102 close to the preparation area 101, that is, the lower side of the sludge discharge area 102 is arranged close to the preparation area 101.

[0037] Specifically, the biofilm detached from the denitrification filler 200 can usually only be discharged from the upper part of the denitrification filter 10 through the backwashing process, which results in easier clogging of the lower-layer denitrification filler 200. Therefore, by arranging a sludge discharge area 700 at the bottom of the filler area 102, the sludge deposited in the filler area 102 can be regularly removed to prevent it from fouling and clogging the lower-layer denitrification filler 200. Additionally, by arranging the sludge discharge area 700 in an inclined form, the sludge can slide down along the slope of the sludge discharge area 700 and concentrate at the lower part of the sludge discharge area 700, thereby facilitating the collection and cleaning of the sludge.

[0038] Preferably, the denitrification filler 200 is a sulfur autotrophic denitrification filler 200, which is used for sulfur autotrophic denitrification treatment of the sewage flowing through it. Specifically, when the sewage flows through the sulfur autotrophic denitrification filler 200, through the denitrification of sulfur autotrophic denitrifying microorganisms and using sulfur or reduced sulfide as an electron donor, the nitrate nitrogen in the sewage is converted into nitrogen gas, thereby realizing the denitrification treatment of the sewage, with high removal efficiency, no need to add organic carbon sources, and low operating costs.

[0039] As Figure 1 shown, further, the denitrification filter 10 further includes a backwashing aeration pipe 300, which is arranged in the pool body 100. Specifically, the backwashing aeration pipe 300 is arranged in the filler area 102 and is located at the bottom of the denitrification filler 200. The backwashing aeration pipe 300 is used for performing aeration backwashing operations on the denitrification filler 200 to remove suspended solids and detached biofilms deposited on the denitrification filler 200.

[0040] As Figure 1 shown, the backwashing aeration pipe 300 includes a vertically connected vertical aeration pipe section 310 and a horizontal aeration pipe section 320. The vertical aeration pipe section 310 is arranged in the preparation area 101. One end of the horizontal aeration pipe section 320 is connected to the vertical aeration pipe section 310, and the other end of the horizontal aeration pipe section 320 extends into the filler area 102. The horizontal aeration pipe section 320 is located at the bottom of the denitrification filler 200, and a plurality of aeration holes are arranged at intervals on the horizontal aeration pipe section 320.

[0041] Specifically, one end of the vertical aeration pipe section 310 extends out of the pool body 100 through the top of the preparation area 101. One end of the horizontal aeration pipe section 320 passes through the partition plate 103 and extends into the filler area 102. The horizontal aeration pipe section 320 and the vertical aeration pipe section 310 are connected by an arc transition. A valve 330 is arranged on the backwashing aeration pipe 300, which is used to control the on-off of the backwashing aeration pipe 300. The valve 330 is exposed outside the pool body 100 and is arranged at one end of the vertical aeration pipe section 310 far from the horizontal aeration pipe section 320.

[0042] The denitrification filter 10 further includes a blower, which is connected to the backwashing aeration pipe 300. The blower is used to supply the gas (such as air) required for aeration backwashing to the backwashing aeration pipe 300. Specifically, the blower can be arranged outside the tank body 100 and connected to one end of the vertical aeration pipe section 310 extending outside the tank body 100.

[0043] Preferably, the denitrification filter 10 further includes a water level detector, which can be a liquid level switch such as a float ball or an ultrasonic liquid level gauge. The water level detector is arranged in the preparation area 101 and is used to detect the water level height in the preparation area 101. As the denitrification filter 10 operates, the denitrification filler 200 will become more and more blocked, and the water level in the preparation area 101 will become higher and higher. By setting the water level detector, when the operator detects that the liquid level in the preparation area 101 reaches the preset height, the operator can immediately start the aeration backwashing operation of the backwashing aeration pipe 300, thereby effectively improving the timeliness of the backwashing of the denitrification filler 200.

[0044] Preferably, the denitrification filter 10 further includes a controller, which is electrically connected to the water level detector and the blower. The water level detector is used to detect the water level height in the preparation area 101 and feed back the detection result to the controller. The controller is used to control the operation of the blower according to the detection result of the water level detector. Specifically, when the controller receives the feedback that the liquid level in the preparation area 101 reaches the preset height from the water level detector, the controller can send a feedback command to the blower to control the blower to automatically start supplying gas to the backwashing aeration pipe 300, so as to realize the aeration backwashing operation of the denitrification filler 200 through the backwashing aeration pipe 300.

[0045] As Figure 1 、 Figure 3 and Figure 4 shown, the denitrification filter 10 further includes a gas distribution member 400, which is arranged in the tank body 100 and sleeved outside the backwashing aeration pipe 300. Specifically, the gas distribution member 400 is arranged in the filler area 102 and sleeved outside the horizontal aeration pipe section 320 of the backwashing aeration pipe 300. The gas distribution member 400 is used to expand the aeration volume and aeration intensity of the backwashing aeration pipe 300, so that the backwashing effect of the denitrification filler 200 is better and more uniform.

[0046] Furthermore, there are multiple gas distribution members 400, and the multiple gas distribution members 400 are arranged side by side and sleeved outside the same backwashing aeration pipe 300 to meet the actual gas distribution and installation requirements of the relatively long backwashing aeration pipe 300. Specifically, the multiple gas distribution members 400 are arranged side by side and sleeved outside the horizontal aeration pipe section 320 of the same backwashing aeration pipe 300, and adjacent two gas distribution members 400 are arranged in contact with each other.

[0047] As Figure 5As shown in the figure, further, the backwashing aeration pipe 300 and at least one air distribution member 400 sleeved outside the backwashing aeration pipe 300 together form an aeration backwashing assembly 301. There are multiple groups of the aeration backwashing assemblies 301, and the multiple groups of aeration backwashing assemblies 301 are arranged at intervals in the pool body 100. Preferably, the multiple groups of aeration backwashing assemblies 301 are evenly arranged at intervals in the pool body 100, so that the air distribution of the aeration backwashing assembly 301 is more uniform, and the backwashing effect of the denitrification filler 200 is better and more uniform.

[0048] As Figure 6 shown, in an alternative embodiment, an air storage tank 410 extending along the length direction of the air distribution member 400 is provided in the air distribution member 400, and a plurality of exhaust holes 420 spaced along the length direction are further provided on the side wall of the air distribution member 400. Each exhaust hole 420 communicates with the air storage tank 410. The air storage tank 410 is used to accommodate the backwashing aeration pipe 300 and store the gas output by the backwashing aeration pipe 300, and the exhaust holes 420 are used to discharge the gas stored in the air storage tank 410.

[0049] Specifically, when using the air distribution member 400 to cooperate with the backwashing aeration pipe 300 to perform aeration backwashing operation on the denitrification filler 200, the gas output by the backwashing aeration pipe 300 is continuously stored in the air storage tank 410 of the air distribution member 400. At this time, the air pressure and air volume in the air storage tank 410 continuously increase. When the air pressure and air volume in the air storage tank 410 expand to a certain value, the gas in the air storage tank 410 is discharged from the plurality of exhaust holes 420 provided on the side wall of the air distribution member 400, so as to realize the aeration backwashing operation on the denitrification filler 200. Therefore, by sleeving the air distribution member 400 outside the backwashing aeration pipe 300, the aeration volume and aeration intensity of the backwashing aeration pipe 300 are effectively expanded, thereby effectively enhancing the backwashing aeration effect of the backwashing aeration pipe 300, making the air distribution of the backwashing aeration pipe 300 more uniform, and the backwashing effect of the denitrification filler 200 better and more uniform.

[0050] As Figure 3 shown, specifically, the air storage tank 410 is used to accommodate the horizontal aeration pipe section 320 of the backwashing aeration pipe 300. A first opening 411 is provided on one side in the depth direction of the air storage tank 410, and second openings 412 are provided at both ends in the length direction of the air storage tank 410. The first opening 411 facilitates the operator to install and disassemble the backwashing aeration pipe 300 relative to the air storage tank 410 from the depth direction of the air storage tank 410, and the second openings 412 facilitate the operator to install and disassemble the backwashing aeration pipe 300 relative to the air storage tank 410 from the length direction of the air storage tank 410. Both ends of the horizontal aeration pipe section 320 can extend out of the air storage tank 410 through the second openings 412 provided at both ends in the length direction of the air storage tank 410.

[0051] Specifically, the inner contour of the gas storage tank 410 matches the outer contour of the backwashing aeration pipe 300, so that the backwashing aeration pipe 300 and the air distribution member 400 can be more closely connected. Specifically, the gas storage tank 410 is a U-shaped tank, and the inner contour of the gas storage tank 410 matches the outer contour of the horizontal aeration pipe section 320.

[0052] Furthermore, a plurality of exhaust holes 420 are spaced apart on both opposite sides of the air distribution member 400 to enhance the exhaust effect of the air distribution member 400. Preferably, a plurality of exhaust holes 420 are evenly spaced apart on both opposite sides of the air distribution member 400, and each exhaust hole 420 provided on one side of the air distribution member 400 is aligned with each exhaust hole 420 provided on the opposite side of the air distribution member 400 to improve the exhaust uniformity of the air distribution member 400.

[0053] As Figure 3 shown, furthermore, a guiding inclined surface 422 is provided at the air outlet end of the exhaust hole 420 to guide the gas stored in the gas storage tank 410 to be discharged along a set direction, and the air distribution uniformity is better.

[0054] As Figure 4 shown, optionally, the air distribution member 400 includes a first connecting portion 430, a second connecting portion 440, and a third connecting portion 450. The second connecting portion 440 and the third connecting portion 450 are respectively provided on opposite sides of the first connecting portion 430. The first connecting portion 430, the second connecting portion 440, and the third connecting portion 450 enclose to form the gas storage tank 410, and a plurality of exhaust holes 420 are spaced apart on the second connecting portion 440 and / or the third connecting portion 450. Specifically, both the second connecting portion 440 and the third connecting portion 450 are vertically connected to the first connecting portion 430, and the second connecting portion 440 and the third connecting portion 450 are symmetrically provided on opposite sides of the first connecting portion 430.

[0055] Furthermore, a partition rib 460 is provided between two adjacent exhaust holes 420, that is, two adjacent exhaust holes 420 are separated by the partition rib 460, and the cross-sectional shape of the partition rib 460 can be but is not limited to a rectangle. The first connecting portion 430, the second connecting portion 440, the third connecting portion 450, and the partition rib 460 are integrally formed to facilitate the overall processing and forming of the air distribution member 400.

[0056] Specifically in this embodiment, chamfered inclined surfaces 470 are provided at the joints of the first connecting portion 430 and the second connecting portion 440 and at the joints of the first connecting portion 430 and the third connecting portion 450. Specifically, the chamfered inclined surface 470 at the joint of the first connecting portion 430 and the second connecting portion 440 and the chamfered inclined surface 470 at the joint of the first connecting portion 430 and the third connecting portion 450 have opposite inclination directions.

[0057] As Figure 1As shown, the denitrification filter 10 further includes a supporting layer 500 disposed within the packing zone 102, and the denitrification packing 200 is carried on the supporting layer 500. Preferably, the supporting layer 500 may be a supporting grid having a plurality of perforations, and the supporting grid may be a plate-like structure. Since the supporting grid has a plurality of perforations, the supporting grid can not only play a good supporting role, but also has the advantages of good water passing and air passing, which is beneficial to improving the overall performance of the denitrification filter 10.

[0058] As Figure 1 shown, in order to more stably support the denitrification packing 200 and the supporting layer 500, the denitrification filter 10 further includes a support member 600 disposed within the packing zone 102, the supporting layer 500 is carried on the support member 600, and the denitrification packing 200, the supporting layer 500, and the support member 600 are distributed in sequence from top to bottom.

[0059] Optionally, the support member 600 includes a plurality of support rods 610, and the plurality of support rods 610 are spaced apart within the packing zone 102, and each support rod 610 is connected between the opposite inner sidewalls of the packing zone 102. Specifically, the horizontal aeration pipe section 320 of the backwashing aeration pipe 300 is carried on the support member 600 and is located between the support member 600 and the supporting layer 500, and the air distribution member 400 is carried on the support member 600 and is located between the support member 600 and the supporting layer 500.

[0060] Specifically, in this embodiment, the air distribution member 400 is clamped with the support member 600 so that the air distribution member 400 is fixedly connected to the support member 600. It can be understood that in other embodiments, the air distribution member 400 and the support member 600 can also be fixedly connected by means of threaded connection or welding.

[0061] As Figure 7 shown, the present application further provides a denitrification filter assembly 1, and the denitrification filter assembly 1 includes a plurality of denitrification filters 10 arranged side by side. In one embodiment, each denitrification filter 10 is integrally connected, and the connection parts of the tank bodies 100 of adjacent two denitrification filters 10 are shared with each other to save the overall manufacturing cost of the denitrification filter assembly 1.

[0062] In one embodiment, the height of the water inlet 110 of each denitrification filter 10 is adjustable so that the heights of the water inlets 110 of each denitrification filter 10 are kept flush with each other.

[0063] For the above denitrification filter assembly 1, a denitrification filler 200 is arranged in the tank body 100 of each denitrification filter 10. When the sewage to be treated flows through the denitrification filler 200, the denitrification filler 200 can perform denitrification treatment on the flowing sewage to convert nitrate nitrogen in the sewage into nitrogen gas, thereby realizing the nitrogen removal treatment of the sewage. In this solution, since the height of the water inlet 110 of each denitrification filter 10 is adjustable, the operator can flexibly adjust the height of the water inlet 110 of each denitrification filter 10 according to the water inlet demand, so that the heights of the water inlets 110 of each denitrification filter 10 are kept flush. In this way, when the sewage to be treated flows to the denitrification filter assembly 1, the water level and the water inlet volume in the tank bodies 100 of each side-by-side denitrification filter 10 can be guaranteed to be balanced, avoiding the problem of uneven water inlet volume in each denitrification filter 10 (for example, the denitrification filter 10 with a lower water inlet 110 enters water first and has a large water inlet volume, while the denitrification filter 10 with a higher water inlet 110 has no water inlet) caused by the inconsistent height of the water inlets 110 of each denitrification filter 10.

[0064] As Figure 1 shown, optionally, the water inlet 110 includes a water inlet pipe 111. The water inlet pipe 111 includes a horizontally connected horizontal water inlet pipe section 112 and a vertically connected vertical water inlet pipe section 113. The water outlet end of the horizontal water inlet pipe section 112 extends into the tank body 100 through the side of the tank body 100 away from the water outlet 120. The water inlet end of the horizontal water inlet pipe section 112 is located outside the tank body 100. The vertical water inlet pipe section 113 is located outside the tank body 100. The water inlet end of the vertical water inlet pipe section 113 is above the water outlet end of the vertical water inlet pipe section 113. The water outlet end of the vertical water inlet pipe section 113 is detachably connected to the water inlet end of the horizontal water inlet pipe section 112. The sewage to be treated can flow into the vertical water inlet pipe section 113 through the water inlet port of the vertical water inlet pipe section 113 in sequence, and then flow into the horizontal water inlet pipe section 112 through the water outlet port of the vertical water inlet pipe section 113 and the water inlet port of the horizontal water inlet pipe section 112 in sequence, and then flow into the tank body 100 from the water outlet port of the horizontal water inlet pipe section 112. The length of the vertical water inlet pipe section 113 is adjustable, so that the height of the water inlet port of the vertical water inlet pipe section 113 is adjustable. With such a setting, when the height of the water inlet 110 needs to be adjusted, the operator only needs to replace the vertical water inlet pipe section 113 with a suitable length, effectively improving the convenience of adjusting the height of the water inlet 110 of each denitrification filter 10.

[0065] Furthermore, the water inlet pipe 111 can be a PVC pipe, and the horizontal water inlet pipe section 112 and the vertical water inlet pipe section 113 are connected by an arc transition. Further, a water inlet grid 130 is arranged at the water inlet 110. The water inlet grid 130 is used for preliminary grid treatment of the sewage, so as to reduce the fouling of the denitrification filler 200. Specifically, a water inlet grid 130 is arranged at the water inlet port of the vertical water inlet pipe section 113.

[0066] The above are only the preferred embodiments of the present utility model, and do not thus limit the patent scope of the present utility model. Any equivalent structural transformation made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields shall be included within the patent protection scope of the present utility model.

Claims

1. A denitrification filter, characterized in that, Comprising: A pool body, with a water inlet and a water outlet respectively arranged on two opposite sides of the pool body. The sewage to be treated can flow into the pool body through the water inlet and then flow out of the pool body through the water outlet. The height of the water outlet is adjustable to make the water level difference between the water inlet and the water outlet adjustable; and Denitrifying fillers, arranged in the pool body, and used for denitrifying the sewage flowing through.

2. The denitrification filter according to claim 1, characterized in that, The water outlet includes a water outlet pipe, which includes a horizontal water outlet pipe section and a vertical water outlet pipe section. The water inlet end of the horizontal water outlet pipe section extends into the pool body through the side of the pool body far from the water inlet, the water outlet end of the horizontal water outlet pipe section is located outside the pool body, the vertical water outlet pipe section is located in the pool body, the water inlet end of the vertical water outlet pipe section is above the water outlet end of the vertical water outlet pipe section, and the water outlet end of the vertical water outlet pipe section is detachably connected to the water inlet end of the horizontal water outlet pipe section. The water flowing out of the denitrifying fillers can sequentially flow into the vertical water outlet pipe section through the water inlet end of the vertical water outlet pipe section, then sequentially flow into the horizontal water outlet pipe section through the water outlet end of the vertical water outlet pipe section and the water inlet end of the horizontal water outlet pipe section, and then flow out of the pool body through the water outlet end of the horizontal water outlet pipe section. The length of the vertical water outlet pipe section is adjustable to make the height of the water inlet end of the vertical water outlet pipe section adjustable.

3. The denitrification filter according to claim 2, characterized in that, The horizontal water outlet pipe section and the vertical water outlet pipe section are connected by an arc transition.

4. The denitrification filter according to claim 1, wherein The water outlet is provided with a water outlet grid.

5. The denitrification filter according to claim 1, characterized in that, A mixing area and a filler area are arranged in the pool body and are communicated with each other. The mixing area and the filler area are sequentially distributed along the length direction or the width direction of the pool body; the water inlet is arranged in the mixing area; the water outlet is arranged in the filler area; the sewage to be treated flows in from the water inlet and sequentially passes through the mixing area and the filler area and then flows out of the pool body through the water outlet. The denitrifying fillers are arranged in the filler area.

6. The denitrification filter according to claim 5, characterized in that, A sludge discharge area is arranged at the bottom of the filler area, and the sludge discharge area slopes downward obliquely from the first side of the filler area to the second side of the filler area.

7. The denitrification filter according to claim 1, wherein The denitrifying fillers are sulfur autotrophic denitrifying fillers, and the sulfur autotrophic denitrifying fillers are used for sulfur autotrophic denitrification treatment of the sewage flowing through.

8. The denitrification filter according to claim 1, characterized in that, It further includes an anti-flushing aeration pipe, which is arranged in the pool body and is located at the bottom of the denitrifying fillers. The anti-flushing aeration pipe is used for performing aeration and anti-flushing operations on the denitrifying fillers.

9. The denitrification filter according to claim 8, wherein, It further includes an air distribution member, which is arranged in the pool body and is sleeved outside the anti-flushing aeration pipe. The air distribution member is used for expanding the aeration volume and aeration intensity of the anti-flushing aeration pipe.

10. The denitrification filter according to claim 9, characterized in that, The anti-flushing aeration pipe and at least one air distribution member sleeved outside the anti-flushing aeration pipe together form an aeration and anti-flushing assembly. There are multiple groups of the aeration and anti-flushing assemblies, and multiple groups of the aeration and anti-flushing assemblies are arranged at intervals in the pool body.

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