Denitrification filter tank

Abstract

The denitrification filter tank comprises a tank body and sulfur autotrophic denitrification filler, a blending area and a filler area which are communicated with each other are arranged in the tank body, and the blending area and the filler area are sequentially distributed in the length direction or the width direction of the tank body; the blending area is provided with a water inlet; the filler area is provided with a water outlet; sewage to be treated flows in from the water inlet, sequentially passes through the blending area and the filler area and flows out of the tank body from the water outlet; the sulfur autotrophic denitrification filler is arranged in the filler area and is used for performing sulfur autotrophic denitrification treatment on the flowing sewage. When sewage flows through the sulfur autotrophic denitrification filler, nitrate nitrogen in the sewage is converted into nitrogen through the denitrification effect of sulfur autotrophic denitrification microorganisms and by taking sulfur or reduced sulfide as an electron donor, so that the denitrification treatment of the sewage is realized, the removal efficiency is high, an organic carbon source does not need to be added, and the operation cost is low.

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] A denitrification filter tank is a biological filter tank with a denitrification and nitrogen removal function. It is developed on the basis of a traditional biological filter tank. In the denitrification filter tank, the denitrification filler serves as a carrier for the biological film. With the denitrification effect of relevant microorganisms, nitrate nitrogen in the sewage is reduced to nitrogen gas and discharged, thereby realizing the nitrogen removal of the sewage. However, conventional denitrification filter tanks often need to add an organic carbon source as an electron donor for the microbial denitrification reaction, resulting in a relatively high operating cost of the denitrification filter tank. Summary of the Utility Model

[0003] Based on this, it is necessary to provide a denitrification filter tank with high removal efficiency and low operating cost.

[0004] A denitrification filter tank includes:

[0005] A tank body, in which a connected preparation area and a filler area are arranged. The preparation area and the filler area are distributed in sequence along the length direction or the width direction of the tank body; an inlet is arranged in the preparation area; an outlet is arranged in the filler area; the sewage to be treated flows in from the inlet, and successively passes through the preparation area and the filler area and flows out of the tank body from the outlet; and

[0006] A sulfur autotrophic denitrification filler, which is arranged in the filler area and is used for performing sulfur autotrophic denitrification treatment on the flowing sewage.

[0007] In one embodiment, a partition is arranged in the tank body. The partition divides the internal space of the tank body into the preparation area and the filler area. A water passing port is arranged on the partition. The water passing port communicates the preparation area and the filler area, and the water passing port is located below the outlet.

[0008] In one embodiment, it further includes an anti-flushing aeration pipe, which is arranged in the filler area and is located at the bottom of the sulfur autotrophic denitrification filler. The anti-flushing aeration pipe is used for performing aeration anti-flushing operation on the sulfur autotrophic denitrification filler.

[0009] In one embodiment, the anti-flushing aeration pipe includes a vertical aeration pipe section and a horizontal aeration pipe section. The vertical aeration pipe section is arranged in the preparation area. One end of the horizontal aeration pipe section is connected to the vertical aeration pipe section, and the other end of the horizontal aeration pipe section extends into the filler area. The horizontal aeration pipe section is located at the bottom of the sulfur autotrophic denitrification filler, and a plurality of aeration holes are arranged at intervals on the horizontal aeration pipe section.

[0010] In one embodiment, it further includes an air distribution member which is arranged in the packing area and sleeved outside the horizontal aeration pipe section, and the air distribution member is used to increase the aeration volume of the backwashing aeration pipe.

[0011] In one embodiment, it further includes a water level detector which is arranged in the preparation area, and the water level detector is used to detect the water level height in the preparation area.

[0012] In one embodiment, it further includes a supporting layer which is arranged in the packing area, and the sulfur autotrophic denitrification packing is carried on the supporting layer.

[0013] In one embodiment, it further includes a support member which is arranged in the packing area, the supporting layer is carried on the support member, and the sulfur autotrophic denitrification packing, the supporting layer and the support member are distributed in sequence from top to bottom.

[0014] In one embodiment, the support member includes a plurality of support rods which are arranged in the packing area at intervals.

[0015] In one embodiment, a sludge discharge area is arranged at the bottom of the packing area, and the sludge discharge area slopes obliquely downward from the first side to the second side of the packing area.

[0016] In the above denitrification filter, a preparation area and a packing area which are communicated with each other are arranged in the filter body, and the preparation area and the packing area are distributed in sequence along the length direction or the width direction of the filter body; when sewage flows through the sulfur autotrophic denitrification packing, 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 sewage, with high removal efficiency, no need to add organic carbon source, and low operation cost. In addition, by arranging a preparation area in the filter body, on the one hand, the preparation area can be used for guiding and distributing sewage, so that the sewage can further flow through the sulfur autotrophic denitrification packing along a specified path, and at the same time, the preparation area also has the functions of sludge discharge and maintenance, so as to discharge the sludge deposited in the denitrification filter in time and carry out maintenance on 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 following will briefly introduce the drawings required in the embodiments. 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 an embodiment;

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

[0020] Figure 3 It is a combined view of the backwashing aeration pipe and the air distribution component of the denitrification filter in an embodiment;

[0021] Figure 4 It is Figure 3 an enlarged schematic view of part A in

[0022] Figure 5 It is a structural schematic view of the air distribution component of the denitrification filter in an embodiment;

[0023] Figure 6 It is a structural schematic view of the air distribution component of the denitrification filter from another perspective in an embodiment;

[0024] Figure 7 It is a structural schematic view of the denitrification filter assembly in an embodiment. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention 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 the 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 should not be construed 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 such feature. 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 where both A and B are satisfied simultaneously. In addition, the technical solutions between 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 scope of protection required by the present utility model.

[0028] As Figure 1 and Figure 2 shown in the figure, the present application provides a denitrification filter 10, which includes a pool body 100 and sulfur autotrophic denitrification fillers 200. A communicating dosing area 101 and a filler area 102 are arranged in the pool body 100, and the dosing area 101 and the filler area 102 are sequentially distributed along the length direction or the width direction of the pool body 100. The dosing area 101 is provided with a water inlet 110; the filler area 102 is provided with a water outlet 120; the sewage to be treated flows in from the water inlet 110, passes through the dosing area 101 and the filler area 102 in sequence, and flows out of the pool body 100 from the water outlet 120. The sulfur autotrophic denitrification fillers 200 are arranged in the filler area 102, and the sulfur autotrophic denitrification fillers 200 are used for performing sulfur autotrophic denitrification treatment on the flowing sewage.

[0029] In the above-mentioned denitrification filter 10, a communicating dosing area 101 and a filler area 102 are arranged in the pool body 100, and the dosing area 101 and the filler area 102 are sequentially distributed along the length direction or the width direction of the pool body 100. When the sewage flows through the sulfur autotrophic denitrification fillers 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 source, and low operating cost. In addition, by arranging the dosing area 101 in the pool body 100, on the one hand, the dosing area 101 can be used for guiding and distributing the sewage, so that the sewage can further flow through the sulfur autotrophic denitrification fillers 200 along the specified path. At the same time, the dosing area 101 also has the functions of sludge discharge and maintenance, so as to timely discharge the sludge deposited in the denitrification filter 10 and perform maintenance on the denitrification filter 10.

[0030] As Figure 1As shown, further, a partition 103 is provided inside the pool body 100. The partition 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 provided on the partition 103. The water passing port 104 connects 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 provided at the bottom of the partition 103.

[0031] Specifically, the sewage to be treated flows into the preparation area 101 through the water inlet 110. The preparation area 101 conducts diversion and distribution of the sewage. 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 sulfur autotrophic 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 sulfur autotrophic 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 10 flows upward with the nitrogen gas, effectively avoiding the accumulation of nitrogen gas inside the sulfur autotrophic denitrification packing 200 and preventing the nitrogen gas from blocking the sulfur autotrophic denitrification packing 200, thereby prolonging the operation cycle of the denitrification filter 10 and reducing the operation cost of the denitrification filter 10.

[0032] As Figure 2 and Figure 3 shown, further, the denitrification filter 10 further includes an anti - flushing aeration pipe 300. The anti - flushing aeration pipe 300 is arranged in the packing area 102 and is located at the bottom of the sulfur autotrophic denitrification packing 200. The anti - flushing aeration pipe 300 is used to perform aeration and back - flushing operations on the sulfur autotrophic denitrification packing 200 to remove suspended solids and shed biofilms deposited on the sulfur autotrophic denitrification packing 200, etc.

[0033] As Figure 3 and Figure 4 shown, the anti - flushing 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 packing area 102. The horizontal aeration pipe section 320 is located at the bottom of the sulfur autotrophic denitrification packing 200, and a plurality of aeration holes are arranged at intervals on the horizontal aeration pipe section 320.

[0034] 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 packing 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 provided on the backwashing aeration pipe 300. The valve 330 is used to control the on-off of the backwashing aeration pipe 300. The valve 330 is exposed outside the pool body 100, and the valve 330 is arranged at one end of the vertical aeration pipe section 310 away from the horizontal aeration pipe section 320.

[0035] 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 pool body 100 and connected to one end of the vertical aeration pipe section 310 that extends out of the pool body 100.

[0036] Preferably, the denitrification filter 10 further includes a water level detector. The water level detector 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. The water level detector is used to detect the water level height in the preparation area 101. As the denitrification filter 10 operates, the sulfur autotrophic denitrification packing 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 sulfur autotrophic denitrification packing 200.

[0037] Preferably, the denitrification filter 10 further includes a controller. The controller 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 feedback 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 sulfur autotrophic denitrification packing 200 through the backwashing aeration pipe 300.

[0038] As Figure 2 and Figure 4 shown, the denitrification filter 10 further includes a gas distribution member 400. The gas distribution member 400 is arranged in the packing area 102 and sleeved outside the backwashing aeration pipe 300. Specifically, the gas distribution member 400 is sleeved outside the horizontal aeration pipe section 320. The gas distribution member 400 is used to increase the aeration volume and aeration intensity of the backwashing aeration pipe 300, so that the backwashing effect of the sulfur autotrophic denitrification packing 200 is better and more uniform.

[0039] Furthermore, there are multiple air distribution members 400, and the multiple air distribution members 400 are sleeved side by side outside the same backwashing aeration pipe 300 to meet the actual air distribution and installation requirements of the relatively long backwashing aeration pipe 300. Specifically, the multiple air distribution members 400 are sleeved side by side outside the horizontal aeration pipe section 320 of the same backwashing aeration pipe 300, and two adjacent air distribution members 400 are arranged in contact with each other.

[0040] As Figure 3 shown, furthermore, 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 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 sulfur autotrophic denitrification filler 200 is better and more uniform.

[0041] As Figure 5 and Figure 6 shown, in an optional embodiment, an air storage tank 410 extending along the length direction of the air distribution member 400 is arranged in the air distribution member 400, and a plurality of exhaust holes 420 spaced along the length direction of the air distribution member 400 are further arranged on the side wall of the air distribution member 400. Each exhaust hole 420 is communicated 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.

[0042] Specifically, when using the air distribution member 400 to cooperate with the backwashing aeration pipe 300 to perform aeration backwashing operation on the sulfur autotrophic 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 first. 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 sulfur autotrophic 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 sulfur autotrophic denitrification filler 200 better and more uniform.

[0043] Specifically, the air storage tank 410 is used to accommodate the horizontal aeration pipe section 320 of the backwash aeration pipe 300. A first opening 411 is provided on one side of the air storage tank 410 in the depth direction, and second openings 412 are provided at both ends of the air storage tank 410 in the length direction. The first opening 411 facilitates the operator to install and remove the backwash aeration pipe 300 relative to the air storage tank 410 from the depth direction of the air storage tank 410, and the second opening 412 facilitates the operator to install and remove the backwash 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 of the air storage tank 410 in the length direction.

[0044] Specifically, the inner contour of the air storage tank 410 matches the outer contour of the backwash aeration pipe 300, so that the backwash aeration pipe 300 and the air distribution member 400 can be more closely connected. Specifically, the air storage tank 410 is a U-shaped tank, and the inner contour of the air storage tank 410 matches the outer contour of the horizontal aeration pipe section 320.

[0045] Further, multiple exhaust holes 420 are arranged at intervals on opposite sides of the air distributing member 400 to enhance the exhaust effect of the air distributing member 400. Preferably, multiple exhaust holes 420 are evenly arranged at intervals on opposite sides of the air distributing member 400, and each exhaust hole 420 arranged on one side of the air distributing member 400 is aligned with each exhaust hole 420 arranged on the other side opposite to the air distributing member 400 to improve the exhaust uniformity of the air distributing member 400.

[0046] Furthermore, a guide slope 422 is provided at the gas outlet end of the gas outlet hole 420 to guide the gas stored in the gas storage tank 410 to be discharged along a set direction, so that the gas distribution uniformity is better.

[0047] like Figure 6 As shown, optionally, the air distribution member 400 includes a first connection portion 430, a second connection portion 440 and a third connection portion 450, the second connection portion 440 and the third connection portion 450 are respectively arranged on opposite sides of the first connection portion 430, the first connection portion 430, the second connection portion 440 and the third connection portion 450 are enclosed to form an air storage tank 410, and a plurality of exhaust holes 420 are arranged at intervals on the second connection portion 440 and / or the third connection portion 450. Specifically, the second connection portion 440 and the third connection portion 450 are both vertically connected to the first connection portion 430, and the second connection portion 440 and the third connection portion 450 are symmetrically arranged on opposite sides of the first connection portion 430.

[0048] Further, 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. 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.

[0049] Specifically, in this embodiment, chamfered inclined surfaces 470 are provided at the connection between the first connecting portion 430 and the second connecting portion 440 and at the connection between the first connecting portion 430 and the third connecting portion 450. Specifically, the inclined directions of the chamfered inclined surfaces 470 at the connection between the first connecting portion 430 and the second connecting portion 440 and the chamfered inclined surfaces 470 at the connection between the first connecting portion 430 and the third connecting portion 450 are opposite.

[0050] As Figure 1 and Figure 2 shown, preferably, the height of the water outlet 120 is adjustable so that the water level difference between the water inlet 110 and the water outlet 120 is adjustable.

[0051] In this solution, since the height of the water outlet 120 of the denitrification filter tank 10 is adjustable, when it is found during the on-site operation of the denitrification filter tank 10 that the denitrification filter tank 10 cannot operate normally due to unreasonable design head loss, the operator can adjust the height of the water outlet 120 of the denitrification filter tank 10 to flexibly adjust the water level difference between the water inlet 110 and the water outlet 120, that is, the design head loss of the denitrification filter tank 10, to cope with various different situations, so that the design head loss and the actual head loss can match, thereby ensuring the normal operation of the denitrification filter tank 10.

[0052] As Figure 2As shown, the water 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 water 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 outlet of the sulfur autotrophic 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 water outlet 120, the operator only needs to replace the vertical water outlet pipe section 123 with an appropriate length, effectively improving the convenience of adjusting the height of the water outlet 120 of the denitrification filter 10.

[0053] 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 water 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 sulfur autotrophic denitrification filler 200 in the pool body 100 from flowing out of the pool body 100, so as to avoid the loss of the sulfur autotrophic denitrification filler 200. Specifically, the water outlet grid 140 is arranged at the inlet port of the vertical water outlet pipe section 123.

[0054] As Figure 2 shown, the denitrification filter 10 further includes a supporting layer 500. The supporting layer 500 is arranged in the filler area 102, and the sulfur autotrophic denitrification filler 200 is carried on the supporting layer 500. Preferably, the supporting layer 500 can be a supporting grid with multiple perforations. The supporting grid can be a plate-like structure. Since the supporting grid has multiple 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.

[0055] As Figure 2 shown, in order to more stably support the sulfur autotrophic denitrification filler 200 and the supporting layer 500, the denitrification filter 10 further includes a supporting member 600. The supporting member 600 is arranged in the filler area 102, the supporting layer 500 is carried on the supporting member 600, and the sulfur autotrophic denitrification filler 200, the supporting layer 500 and the supporting member 600 are distributed in sequence from top to bottom.

[0056] Optionally, the support member 600 includes a plurality of support rods 610. The plurality of support rods 610 are spaced apart in the packing area 102, and each support rod 610 is connected between the opposite inner sidewalls of the packing area 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.

[0057] 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.

[0058] As Figure 2 shown, further, a sludge discharge area 700 is provided at the bottom of the packing area 102. The sludge discharge area 700 slopes obliquely downward 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 away from the blending area 101, and the second side of the packing area 102 is the side of the packing area 102 close to the blending area 101, that is, the lower side of the sludge discharge area 102 is arranged close to the blending area 101.

[0059] Specifically, the biofilm falling off from the sulfur autotrophic denitrification packing 200 can usually only be discharged from the upper part of the denitrification filter 10 through the backwashing process, which results in the lower-layer sulfur autotrophic denitrification packing 200 being more likely to be blocked. Therefore, by providing the sludge discharge area 700 at the bottom of the packing area 102, the sludge deposited in the packing area 102 can be periodically removed to prevent it from fouling and blocking the lower-layer sulfur autotrophic denitrification packing 200; in addition, 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, so as to facilitate the collection and cleaning of the sludge.

[0060] As Figure 7 shown, the present application also provides a denitrification filter assembly 1, which includes a plurality of denitrification filters 10 arranged side by side. In one embodiment, each denitrification filter 10 is connected as a whole, and the connecting parts of the tank bodies 100 of adjacent two denitrification filters 10 share each other to save the overall manufacturing cost of the denitrification filter assembly 1.

[0061] 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.

[0062] In the above denitrification filter assembly 1, sulfur autotrophic denitrification fillers 200 are arranged in the tank body 100 of each denitrification filter 10. When the sewage to be treated flows through the sulfur autotrophic denitrification fillers 200, the sulfur autotrophic denitrification fillers 200 can carry out denitrification treatment on the flowing sewage to convert nitrate nitrogen in the sewage into nitrogen gas, thereby realizing the denitrification treatment of the sewage. 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 juxtaposed denitrification filter 10 can be guaranteed to be balanced, avoiding the problem that the water inlet volumes of each denitrification filter 10 are unbalanced due to the inconsistent heights of the water inlets 110 of each denitrification filter 10 (for example, the denitrification filter 10 with a lower water inlet 110 fills with water first and has a large water inlet volume, while the denitrification filter 10 with a higher water inlet 110 has no water inlet).

[0063] As Figure 2 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 from the side of the tank body 100 far 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.

[0064] Further, 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 provided at the water inlet 110, and the water inlet grid 130 is used for preliminary grid treatment of sewage, so as to reduce the fouling of the sulfur autotrophic denitrification filler 200. Specifically, a water inlet grid 130 is provided at the water inlet end of the vertical water inlet pipe section 113.

[0065] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A denitrification filter, characterized in that, Comprising: A pool body, in which a mixing area and a packing area are provided and are communicated with each other. The mixing area and the packing area are sequentially distributed along the length direction or the width direction of the pool body; an inlet is provided in the mixing area; an outlet is provided in the packing area; the sewage to be treated flows in from the inlet, and sequentially passes through the mixing area and the packing area and flows out of the pool body from the outlet; and A sulfur autotrophic denitrification packing, which is arranged in the packing area and is used for performing sulfur autotrophic denitrification treatment on the flowing sewage.

2. The denitrification filter according to claim 1, wherein A partition is arranged in the pool body. The partition divides the internal space of the pool body into the mixing area and the packing area. A water passing port is arranged on the partition. The water passing port communicates the mixing area and the packing area, and the water passing port is located below the outlet.

3. The denitrification filter according to claim 1, wherein, It further includes an anti-flushing aeration pipe, which is arranged in the packing area and is located at the bottom of the sulfur autotrophic denitrification packing. The anti-flushing aeration pipe is used for performing aeration anti-flushing operation on the sulfur autotrophic denitrification packing.

4. The denitrification filter according to claim 3, wherein, The anti-flushing aeration pipe includes a vertical aeration pipe section and a horizontal aeration pipe section. The vertical aeration pipe section is arranged in the mixing area. One end of the horizontal aeration pipe section is connected to the vertical aeration pipe section, and the other end of the horizontal aeration pipe section extends into the packing area. The horizontal aeration pipe section is located at the bottom of the sulfur autotrophic denitrification packing, and a plurality of aeration holes are arranged at intervals on the horizontal aeration pipe section.

5. The denitrification filter according to claim 4, wherein, It further includes an air distribution member, which is arranged in the packing area and is sleeved outside the horizontal aeration pipe section. The air distribution member is used for expanding the aeration volume of the anti-flushing aeration pipe.

6. The denitrification filter according to claim 3, characterized in that, It further includes a water level detector, which is arranged in the mixing area. The water level detector is used for detecting the water level height in the mixing area.

7. The denitrification filter according to claim 1, wherein, It further includes a supporting layer, which is arranged in the packing area. The sulfur autotrophic denitrification packing is carried on the supporting layer.

8. The denitrification filter according to claim 7, wherein, It further includes a supporting member, which is arranged in the packing area. The supporting layer is carried on the supporting member. The sulfur autotrophic denitrification packing, the supporting layer and the supporting member are sequentially distributed from top to bottom.

9. The denitrification filter according to claim 8, wherein The supporting member includes a plurality of support rods, and the plurality of support rods are arranged at intervals in the packing area.

10. The denitrification filter according to claim 1, characterized in that, A sludge discharge area is arranged at the bottom of the packing area, and the sludge discharge area slopes obliquely downward from the first side of the packing area to the second side of the packing area.

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