Denitrification deep-bed filter tank for sewage treatment

Abstract

The invention relates to the technical field of sewage treatment, in particular to a denitrification deep-bed filter tank for sewage treatment. The water distribution tank, the water filtering tank and the clean water tank are located on one side of the sewage tank, and a water distribution tank, a filter material layer and filter bricks are sequentially arranged in the sewage tank from top to bottom; the water distribution tank is communicated with the sewage tank through a water outlet; the clean water tank is communicated with the water filter tank through an arranged water outlet pipe, and the bottom of the water filter tank is communicated with the bottom of the sewage tank; in the denitrification deep-bed filter tank for sewage treatment, when the filtering performance of the filter material layer is reduced, the water distribution tank and the sealing piece form a whole, sewage at the top of the filter material layer is extruded, so that the sewage has certain pressure, the efficiency of the sewage passing through the filter material layer is increased, and the sewage continues to be filtered; therefore, the backwashing frequency is reduced, and the sewage filtering efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to a denitrification deep bed filter for sewage treatment. Background Art

[0002] Denitrification, also known as denitrification, refers to the biochemical process in which bacteria reduce nitrogen in nitrate to nitrogen gas through a series of intermediate products. Under anaerobic conditions, denitrifying bacteria complete respiration using nitrate as an electron acceptor to obtain energy. Denitrification is often used in the treatment and purification of ammonia nitrogen in sewage.

[0003] The denitrification deep bed filter is a common device for treating sewage. The sewage is added into the denitrification deep bed filter, and then denitrifying bacteria are added thereto to treat the ammonia nitrogen. The treated solution seeps out from the bottom of the filter, and the impurities in the sewage are vertically intercepted after passing through the filter layer, so that they remain in the filler.

[0004] Since impurities in sewage will be continuously retained by the filter layer, after a period of filtration, as the impurities continue to increase, the filtration performance of the filter layer will decrease, so backwashing is required to remove the retained solids.

[0005] However, during the backwashing process, the denitrification deep bed filter cannot filter sewage. At the same time, it takes a certain amount of time for the denitrification deep bed filter to switch from filtration to backwashing. Such frequent backwashing will affect the filtering efficiency of the denitrification deep bed filter for sewage. Summary of the invention

[0006] The object of the present invention is to provide a denitrification deep bed filter for sewage treatment to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, a denitrification deep bed filter for sewage treatment is provided, comprising a sewage pool and a water distribution pool, a filter water pool and a clean water pool located on one side of the sewage pool, wherein the sewage pool is provided with a water distribution trough, a filter material layer and a filter brick in sequence from top to bottom; the water distribution pool is connected to the sewage pool through a provided drain outlet; the clean water pool is connected to the filter water pool through a provided outlet pipe, and the bottom of the filter water pool is in a connected state with the bottom of the sewage pool; the water distribution trough is longitudinally movably arranged in the sewage pool; the denitrification deep bed filter also includes,

[0008] A sealing member is arranged at the bottom of each water distribution trough, and the sealing member has a normal state and a blocking state;

[0009] A control component, used to control the control component according to the efficiency of the filter material layer in filtering sewage. When the efficiency of the filter material layer in filtering sewage decreases, the control component drives the sealing member to switch back and forth between a normal state and a blocking state;

[0010] When the sealing member is in a blocking state, the sealing member blocks the gap between two adjacent water distribution grooves so that the sealing member and the water distribution grooves form a whole together, which is used to provide downward pressure for the sewage on the top of the filter material layer to increase the efficiency of the sewage passing through the filter material layer.

[0011] As a further improvement of the present technical solution, the water distribution trough is a box structure with an opening on the top, and a plurality of drainage grooves are provided on the side walls thereof for distributing sewage to different positions in the sewage pool.

[0012] As a further improvement of the technical solution, hydraulic rods for driving the water distribution trough to perform longitudinal reciprocating motion are arranged at both ends of the top of the water distribution trough, and the top end of the hydraulic rod is fixedly arranged on the side wall of the sewage pool.

[0013] As a further improvement of the technical solution, the control component includes a lower control component and an upper control component, wherein:

[0014] The lower control member is located above the sealing member and is connected to a driving mechanism for sensing the efficiency of the filter material layer in filtering sewage. When the efficiency of the filter material layer in filtering sewage decreases, the driving mechanism drives the sealing member to a blocked state through the lower control member.

[0015] The upper control member is located on the downward moving path of the sealing member, and is used to switch the sealing member in a blocking state to a normal state.

[0016] As a further improvement of the technical solution, the lower control member is a "V" structure with an opening facing upwards and is fixedly arranged on the inner wall of the sewage tank; the upper control member is a frame structure, and the two ends of the bottom thereof are provided with bevel edges;

[0017] The bottom of the water distribution tank is provided with a through opening for the upper control component to pass through.

[0018] As a further improvement of the technical solution, the sealing member is a sliding plate slidably arranged at both ends of the bottom of the water distribution trough, and the adjacent ends of the two sliding plates are located at the center of the bottom of the upper control member, so that when the upper control member moves downward, the two sliding plates are pushed by the oblique edges to put the convex plate in a blocking state;

[0019] The adjacent ends of the two sliding plates are bent downward to form convex plates, so that when the sliding plates move downward, the two convex plates are guided to fit each other through the inclined surface of the lower control member, so that the sliding plates are switched to a normal state.

[0020] As a further improvement of the present technical solution, two baffles with wedge-shaped tops are slidably provided on the inner wall of the bottom of the water distribution trough. The baffles are located at the opening, and a connecting spring is provided at one end of the baffle, and one end of the connecting spring is fixed to the inner wall of the bottom of the water distribution trough.

[0021] As a further improvement of the present technical solution, the driving mechanism is a transmission rod with one end slidingly penetrating into the water filter tank and the other end fixedly connected to the upper control member, and the end of the transmission rod penetrating into the water filter tank is fixedly connected to a floating plate.

[0022] As a further improvement of the present technical solution, the driving mechanism is a cross bar rotatably arranged between the sewage pool and the water distribution pool, one end of the cross bar extends into the water distribution pool and is connected to a float, and the other end is rotatably connected to a connecting rod, one end of the connecting rod is rotatably connected to a fixed rod longitudinally slidably arranged on the side wall of the sewage pool, and the bottom of the fixed rod is fixedly connected to multiple upper control parts.

[0023] As a further improvement of the present technical solution, a telescopic rod is fixedly provided at the bottom end of the sliding plate, and a scraper is fixedly provided at the bottom of the telescopic rod; when the sliding plate slides at the bottom of the water distribution trough, the scraper scrapes impurities on the surface of the filter material layer to improve the efficiency of sewage entering the filter material layer.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. In the denitrification deep bed filter for sewage treatment, when the filtering performance of the filter layer decreases, the water distribution trough will form a whole with the sealing part, and the sewage on the top of the filter layer will be squeezed, so that the sewage has a certain pressure, and the efficiency of sewage passing through the filter layer is increased to continue the filtering operation, thereby reducing the number of backwashing and improving the filtering efficiency of sewage.

[0026] 2. In the denitrification deep bed filter for sewage treatment, the displaced sliding plate can not only squeeze the sewage on the top of the filter layer during the downward movement, but also drive the scraper to scrape the impurities accumulated on the surface of the filter layer, so that the filter layer in this position is in direct contact with the sewage, avoiding impurities affecting the contact between the sewage and the filter layer, and further extending the filtration time of the filter layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a structural schematic diagram of the water distribution trough of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the control component of the present invention;

[0030] Figure 4 It is a structural schematic diagram of the baffle of the present invention;

[0031] Figure 5 It is a structural schematic diagram of the floating plate of the present invention;

[0032] Figure 6It is a schematic diagram of the working state of the sliding plate of the present invention;

[0033] Figure 7 It is a structural schematic diagram of the float ball of the present invention;

[0034] Figure 8 It is a schematic structural diagram of the scraper of the present invention;

[0035] Fig. 9 It is a schematic diagram of the working state of the scraper of the present invention.

[0036] The meaning of each number in the figure is:

[0037] 100, sewage pool; 101, water distribution pool; 102, water filter pool; 103, clean water pool; 104, water inlet pipe; 105, water outlet pipe; 106, water return pipe; 107, air pipe; 108, drain outlet; 110, filter material layer; 111, filter brick;

[0038] 120, water distribution trough; 121, drainage trough; 122, opening; 123, baffle; 124, connecting spring; 125, hydraulic rod;

[0039] 130, sealing member; 131, sliding plate; 132, convex plate;

[0040] 140, control component; 141, lower control component; 142, upper control component; 143, bevel;

[0041] 150, transmission rod; 151, floating plate;

[0042] 160, crossbar; 161, float; 162, connecting rod; 163, fixing rod;

[0043] 170. Telescopic rod; 171. Scraper; 172. Outer sleeve; 173. Inner rod; 174. Installation spring. DETAILED DESCRIPTION

[0044] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] See also Figure 1 As shown, a denitrification deep bed filter for sewage treatment is provided, including a sewage pool 100 and a water distribution pool 101, a water filter pool 102 and a clean water pool 103 located on one side of the sewage pool 100, wherein the water distribution pool 101, the water filter pool 102 and the clean water pool 103 are arranged in sequence from top to bottom; wherein, a water distribution trough 120, a filter material layer 110 and a filter brick 111 are arranged in sequence from top to bottom inside the sewage pool 100; the water distribution pool 101 is connected to the sewage pool 100 through a set drain port 108; the clean water pool 103 is connected to the water filter pool 102 through a set outlet pipe 105, and the bottom of the water filter pool 102 is in a connected state with the bottom of the sewage pool 100. During the filtering operation, the sewage enters the water distribution pool 101 through the water inlet pipe 104 connected to the side wall of the water distribution pool 101. As the sewage continues to flow in, the water level in the water distribution pool 101 gradually rises. When the water level of the sewage is higher than the drain port 108, the sewage flows into the water distribution trough 120 through the drain port 108, and then the sewage is evenly discharged to each part of the sewage pool 100 through the water distribution trough 120. After the sewage in the sewage pool 100 is filtered by the filter material layer 110, it flows into the filter pool 102 through the filter bricks 111, and then flows into the clean water pool 103 through the outlet pipe 105, and then is discharged to the outside through the pipe connected to one side of the clean water pool 103.

[0048] In addition, when entering the backwash operation, clean water enters the filter tank 102 through the return pipe 106 connected to one side of the filter tank 102, and the clean water in the filter tank 102 enters the sewage tank 100 through the filter tank 102. At the same time, the outside gas passes through the air pipe 107. One end of the air pipe 107 passes through the filter tank 102 and enters the filter brick 111. Therefore, the gas will be transported to the filter brick 111. At this time, the outside gas and clean water rise in the sewage tank 100, thereby flushing impurities out of the filter material layer 110 during the rising process.

[0049] However, it takes a certain amount of time for the denitrification deep bed filter to switch from filtration to backwashing. Frequent backwashing will affect the filtration efficiency of the denitrification deep bed filter for sewage. In order to reduce the number of backwashing times. Figure 1 and Figure 2 As shown, the water distribution trough 120 is longitudinally movable and arranged in the sewage pool 100; the denitrification deep bed filter also includes a sealing member 130 and a control component 140, wherein the sealing member 130 is arranged at the bottom of each water distribution trough 120, and the sealing member 130 has a normal state and a blocked state; the control component 140 is used to control the control component 140 according to the efficiency of the filter material layer 110 in filtering sewage, and when the efficiency of the filter material layer 110 in filtering sewage is reduced, the control component 140 drives the sealing member 130 to switch back and forth between the normal state and the blocked state; when the sealing member 130 is in the blocked state, the sealing member 130 blocks the gap between two adjacent water distribution troughs 120, so that the sealing member 130 and the water distribution trough 120 form a whole together, which is used to provide downward pressure for the sewage on the top of the filter material layer 110, so as to increase the efficiency of the sewage passing through the filter material layer 110.

[0050] Among them, the control component 140 includes a lower control component 141 and an upper control component 142, wherein the lower control component 141 is located above the sealing component 130, and the lower control component 141 is connected to a driving mechanism for sensing the efficiency of the filter layer 110 in filtering sewage. When the efficiency of the filter layer 110 in filtering sewage is reduced, the driving mechanism drives the sealing component 130 to a blocked state through the lower control component 141; the upper control component 142 is located on the downward movement path of the sealing component 130, and is used to switch the sealing component 130 in a blocked state to a normal state.

[0051] Specifically, Figure 3 As shown, the lower control member 141 is in a "V" structure with its opening facing upward and is fixedly mounted on the inner wall of the sewage pool 100; the upper control member 142 is a frame structure with beveled edges 143 at both ends of its bottom; in addition, a through opening 122 is provided at the bottom of the water distribution trough 120 for the upper control member 142 to pass through.

[0052] That is to say, when the filtering performance of the filter layer 110 decreases, the water distribution trough 120 will form a whole with the sealing member 130, and the sewage on the top of the filter layer 110 will be squeezed so that the sewage has a certain pressure, thereby increasing the efficiency of the sewage passing through the filter layer 110 to continue the filtering operation, thereby reducing the number of backwashing times and improving the filtering efficiency of the sewage.

[0053] After the sealing member 130 and the water distribution tank 120 form a whole, continuous power is required to apply pressure to the sealing member 130 and the water distribution tank 120, so as to squeeze the sewage on the top of the filter material layer 110. Figure 2 As shown, hydraulic rods 125 are provided at both ends of the top of the water distribution trough 120, and the top ends of the hydraulic rods 125 are fixedly provided on the side walls of the sewage tank 100. In this way, when the sealing member 130 and the water distribution trough 120 form a whole together, the hydraulic rods 125 can continuously apply driving force to the sealing member 130 and the water distribution trough 120.

[0054] Figure 2 The specific structure of the water distribution trough 120 is shown. As shown in the figure, the water distribution trough 120 is a box structure with an opening on the top, and a plurality of drainage grooves 121 are opened on the side wall thereof for distributing sewage to different positions in the sewage pool 100.

[0055] Figure 3 The specific structure of the sealing member 130 is shown. As shown in the figure, the sealing member 130 is a sliding plate 131 slidably arranged at both ends of the bottom of the water distribution trough 120, and the proximal ends of the two sliding plates 131 are located at the center of the bottom of the upper control member 142, so that when the upper control member 142 moves downward, the two sliding plates 131 are pushed by the bevel 143, so that the convex plate 132 is in a blocked state; the proximal ends of the two sliding plates 131 are bent downward to form the convex plate 132, so that when the sliding plate 131 moves downward, the two convex plates 132 are guided to fit each other through the inclined surface of the lower control member 141, so that the sliding plate 131 switches to a normal state.

[0056] Working principle: When the water filtering efficiency of the filter material layer 110 decreases, the driving mechanism drives the upper control member 142 to descend. At this time, the upper control member 142 passes through the opening 122 and pushes the sliding plate 131 through the bevel 143, so that the sliding plate 131 moves to the outside of the water distribution tank 120. Then, refer to Figure 6As shown, the ends of two adjacent sliding plates 131 will fit together, and at this time, the top and bottom of the sliding plates 131 are in an isolated state. Then, the water distribution trough 120 is driven downward by the hydraulic rod 125, and the drainage trough 121 moves downward to drive the sliding plate 131. The sliding plate 131 moves downward to squeeze the sewage on the top of the filter material layer 110, so that the sewage has enough pressure to pass through the filter material layer 110. When the sliding plate 131 moves down to the lower control member 141, the inclined surface of the lower control member 141 guides the convex plate 132, so that the two convex plates 132 at the bottom of the water distribution trough 120 fit each other. At this time, the sliding plate 131 slides into the bottom of the water distribution trough 120, and the sewage on the top of the water distribution trough 120 begins to flow down. Then, the water distribution trough 120 is driven upward and reset by the hydraulic rod 125. Since the upper control member 142 is not reset, the upper control member 142 will push the sliding plate 131 again during the upward reset process of the water distribution trough 120, thereby forming a cycle.

[0057] In addition, in order to prevent sewage from flowing upward through the opening 122 during the downward movement of the water distribution tank 120, Figure 4 As shown, two baffles 123 are slidably provided on the inner wall of the bottom of the water distribution trough 120. The baffles 123 are located at the through-port 122. A connecting spring 124 is provided at one end of the baffle 123. One end of the connecting spring 124 is fixed to the inner wall of the bottom of the water distribution trough 120. When the upper control member 142 descends, the upper control member 142 squeezes the baffles 123 to both sides. When the upper control member 142 is separated from the through-port 122, the baffles 123 slide to the top of the through-port 122 through the elasticity of the connecting spring 124 to block the through-port 122.

[0058] like Figure 5 As shown, in some embodiments, the driving mechanism is a transmission rod 150 with one end slidingly penetrating into the water filter tank 102 and the other end fixedly connected to the upper control member 142, and one end of the transmission rod 150 penetrating into the water filter tank 102 is fixedly connected to a floating plate 151. In this way, when the water filtering efficiency of the filter material layer 110 decreases, the amount of water entering the water filter tank 102 decreases, while the amount of water discharged into the clean water tank 103 through the outlet pipe 105 does not decrease, so the water level in the water filter tank 102 begins to decrease. When the water level in the water filter tank 102 decreases, the floating plate 151 floating on the liquid in the water filter tank 102 will also decrease accordingly, and at this time, the floating plate 151 drives the upper control member 142 to decrease through the transmission rod 150.

[0059] like Figure 7As shown, in other embodiments, the driving mechanism is a cross bar 160 that is rotatably arranged between the sewage pool 100 and the water distribution pool 101, one end of the cross bar 160 extends into the water distribution pool 101 and is connected to a floating ball 161, and the other end is rotatably connected to a connecting rod 162, one end of the connecting rod 162 is rotatably connected to a fixed rod 163 that is longitudinally slidably arranged on the side wall of the sewage pool 100, and the bottom of the fixed rod 163 is fixedly connected to a plurality of upper control members 142. In this way, when the water filtering efficiency of the filter material layer 110 decreases, the sewage in the sewage pool 100 gradually increases, and when the water level of the sewage is higher than the drain outlet 108, the water level in the water distribution pool 101 will also rise accordingly, thereby driving the floating ball 161 to rise during the rising process, and the rising of the floating ball 161 drives the fixed rod 163 to descend through the cross bar 160, and the descending of the fixed rod 163 drives the upper control member 142 to descend.

[0060] Moreover, Figure 8 and Fig. 9 As shown, a telescopic rod 170 is fixedly provided at the bottom end of the sliding plate 131, and a scraper 171 is fixedly provided at the bottom of the telescopic rod 170. When the sliding plate 131 slides at the bottom of the water distribution tank 120, the scraper 171 scrapes the impurities on the surface of the filter material layer 110 to improve the efficiency of sewage entering the filter material layer 110. The telescopic rod 170 includes an outer sleeve 172 fixedly provided at the bottom of the sliding plate 131, and an inner rod 173 with one end slidingly inserted into the outer sleeve 172 and the other end connected to the scraper 171. A mounting spring 174 is provided between the top of the inner rod 173 and the inner end of the outer sleeve 172 to elastically connect the two.

[0061] When the sliding plate 131 is displaced, the sliding plate 131 drives the scraper 171 to be displaced through the telescopic rod 170, and the scraper 171 is pressed against the surface of the filter layer 110 through the elasticity of the installation spring 174, thereby scraping the impurities accumulated on the surface of the filter layer 110, so that the filter layer 110 at this position is in direct contact with the sewage, and the impurities are prevented from affecting the contact between the sewage and the filter layer 110. At the same time, when the sliding plate 131 is moving downward, the telescopic rod 170 can also be retracted through the elasticity of the installation spring 174, which does not affect the downward movement of the sliding plate 131 and does not cause damage to the filter layer 110.

[0062] In summary, the displaced sliding plate 131 can not only squeeze the sewage on the top of the filter layer 110 during the downward movement, but also drive the scraper 171 to scrape the impurities accumulated on the surface of the filter layer 110, so that the filter layer 110 in this position is in direct contact with the sewage, avoiding impurities from affecting the contact between the sewage and the filter layer 110, and further extending the filtration time of the filter layer 110.

[0063] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A denitrification deep bed filter for sewage treatment, comprising a sewage pool (100) and a water distribution pool (101), a water filter pool (102) and a clear water pool (103) located on one side of the sewage pool (100), wherein: The sewage pool (100) is provided with a water distribution trough (120), a filter material layer (110) and a filter brick (111) in order from top to bottom; the water distribution pool (101) is connected to the sewage pool (100) through a provided drain outlet (108); the clean water pool (103) is connected to the filter water pool (102) through a provided outlet pipe (105), and the bottom of the filter water pool (102) is in a connected state with the bottom of the sewage pool (100); the water distribution trough (120) is longitudinally movably arranged in the sewage pool (100); the denitrification deep bed filter tank also includes, A sealing member (130) is arranged at the bottom of each water distribution tank (120), and the sealing member (130) has a normal state and a blocking state; A control component (140) is used to control the control component (140) according to the efficiency of the filter material layer (110) in filtering sewage, and when the efficiency of the filter material layer (110) in filtering sewage decreases, the control component (140) drives the sealing member (130) to switch back and forth between a normal state and a blocking state; When the sealing member (130) is in a blocking state, the sealing member (130) blocks the gap between two adjacent water distribution grooves (120), so that the sealing member (130) and the water distribution grooves (120) together form a whole, which is used to provide downward pressure for the sewage on the top of the filter material layer (110), so as to increase the efficiency of the sewage passing through the filter material layer (110).

2. The denitrification deep bed filter for sewage treatment according to claim 1, characterized in that: The water distribution trough (120) is a box structure with an opening at the top, and a plurality of drainage grooves (121) are provided on the side wall thereof for distributing sewage to different locations in the sewage pool (100).

3. The denitrification deep bed filter for sewage treatment according to claim 1, characterized in that: Hydraulic rods (125) for driving the water distribution trough (120) to perform longitudinal reciprocating motion are arranged at both ends of the top of the water distribution trough (120), and the top ends of the hydraulic rods (125) are fixedly arranged on the side walls of the sewage tank (100).

4. The denitrification deep bed filter for sewage treatment according to claim 1, characterized in that: The control component (140) includes a lower control component (141) and an upper control component (142), wherein: The lower control member (141) is located above the sealing member (130) and is connected to a driving mechanism for sensing the efficiency of the filter material layer (110) in filtering sewage. When the efficiency of the filter material layer (110) in filtering sewage decreases, the driving mechanism drives the sealing member (130) to a blocked state through the lower control member (141); The upper control member (142) is located on the downward moving path of the sealing member (130) and is used to switch the sealing member (130) in a blocked state to a normal state.

5. The denitrification deep bed filter for sewage treatment according to claim 4, characterized in that: The lower control member (141) is a "V" structure with an opening facing upward and is fixedly mounted on the inner wall of the sewage tank (100); the upper control member (142) is a frame structure with bevel edges (143) disposed at both ends of its bottom; The bottom of the water distribution tank (120) is provided with a through opening (122) for the upper control member (142) to pass through.

6. The denitrification deep bed filter for sewage treatment according to claim 5, characterized in that: The sealing member (130) is a sliding plate (131) slidably arranged at both ends of the bottom of the water distribution trough (120), and the adjacent ends of the two sliding plates (131) are located at the center of the bottom of the upper control member (142), so that when the upper control member (142) moves downward, the two sliding plates (131) are pushed by the inclined edge (143) to put the convex plate (132) in a blocking state; The adjacent ends of the two sliding plates (131) are bent downward to form a convex plate (132), so that when the sliding plate (131) moves downward, the two convex plates (132) are guided to fit each other through the inclined surface of the lower control member (141), so that the sliding plate (131) switches to a normal state.

7. The denitrification deep bed filter for sewage treatment according to claim 5, characterized in that: Two baffles (123) with wedge-shaped tops are slidably arranged on the inner wall of the bottom of the water distribution trough (120); the baffles (123) are located at the opening (122); one end of the baffles (123) is provided with a connecting spring (124); one end of the connecting spring (124) is fixed to the inner wall of the bottom of the water distribution trough (120).

8. The denitrification deep bed filter for sewage treatment according to claim 4, characterized in that: The driving mechanism is a transmission rod (150) having one end slidingly inserted into the water filter tank (102) and the other end fixedly connected to the upper control member (142); the end of the transmission rod (150) inserted into the water filter tank (102) is fixedly connected to a floating plate (151).

9. The denitrification deep bed filter for sewage treatment according to claim 4, characterized in that: The driving mechanism is a cross bar (160) rotatably arranged between the sewage tank (100) and the water distribution tank (101); one end of the cross bar (160) extends into the water distribution tank (101) and is connected to a float (161); the other end is rotatably connected to a connecting rod (162); one end of the connecting rod (162) is rotatably connected to a fixing rod (163) longitudinally slidably arranged on the side wall of the sewage tank (100); the bottom of the fixing rod (163) is fixedly connected to a plurality of upper control members (142).

10. The denitrification deep bed filter for sewage treatment according to claim 6, characterized in that: A telescopic rod (170) is fixedly provided at the bottom end of the sliding plate (131), and a scraper (171) is fixedly provided at the bottom of the telescopic rod (170); when the sliding plate (131) slides at the bottom of the water distribution tank (120), the scraper (171) scrapes impurities on the surface of the filter material layer (110) to improve the efficiency of sewage entering the filter material layer (110).

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