Rapid denitrification device for micro-polluted river water

Abstract

The invention belongs to the technical field of sewage treatment, and discloses a rapid denitrification device for micro-polluted river water, which comprises a denitrification mechanism, the denitrification mechanism comprises a denitrification tower, and an aerobic nitrification layer, an anoxic denitrification layer and an adsorption insurance layer are respectively arranged in the denitrification tower from top to bottom. The system has the following beneficial effects that river water enters the denitrification tower and sequentially flows through the aerobic nitrification layer, the anoxic denitrification layer and the adsorption insurance layer, the aerobic nitrification layer is aerated to supply oxygen, and nitrifying bacteria accelerate conversion of ammonia nitrogen into nitrate; denitrifying bacteria in the anoxic denitrification layer convert nitrate into nitrogen, and the two layers synergistically improve the efficiency; the adsorption insurance layer is stable in residual substance adsorption effect. The porous partition plate water permeable holes are smaller than the filler particle size, smooth circulation of water flow is guaranteed, and rapid and efficient denitrification is achieved.

Description

TECHNICAL FIELD

[0001] The application relates to a rapid denitrification device for micro-polluted river water and belongs to the technical field of sewage treatment. BACKGROUND

[0002] The micro-polluted river water refers to the river water slightly polluted and slightly higher in various pollution indexes than clean water but not reaching the serious pollution degree.

[0003] However, the micro-polluted river water has a high nitrogen content at present, can cause water body eutrophication, make algae breed in large quantities to form water bloom, cause water transparency to decrease, affect the photosynthesis of aquatic plants, destroy the aquatic ecological balance, and consume a large amount of dissolved oxygen when a large amount of algae dies and is decomposed by microorganisms, cause water body to be oxygen-deficient, cause fish and other aquatic organisms to die, aggravate ecological deterioration, and meanwhile, the high-nitrogen water body can emit unpleasant odors due to the generation of hydrogen sulfide, ammonia and other gases by microorganisms decomposing organic matters in the oxygen-deficient environment.

[0004] In view of this, the application provides a rapid denitrification device for micro-polluted river water to solve the above problems, SUMMARY

[0005] The application aims at the deficiencies of the prior art, and provides a rapid denitrification device for micro-polluted river water, when the river water enters a denitrification tower, sequentially flows through an aerobic nitrification layer, an anoxic denitrification layer and an adsorption safety layer, the aerobic nitrification layer is aerated to supply oxygen, and nitrifying bacteria accelerate the conversion of ammonia nitrogen into nitrate; the anoxic denitrification layer converts the nitrate into nitrogen gas by denitrifying bacteria, and the two layers are synergistically efficient; the adsorption safety layer adsorbs residual substances to be stable. The water flow is smooth and circulates through the water-permeable holes of the porous partition plate smaller than the particle size of the filler, rapid and efficient denitrification is realized, and the problems in the background art are solved.

[0006] A rapid denitrification device for micro-polluted river water comprises:

[0007] The pretreatment mechanism comprises a submersible pump, a filter cover is arranged outside the submersible pump, a plurality of water filtering holes are formed in the surface of the filter cover, a rotatable treatment tank is arranged above the submersible pump, and an impurity filter plate with a plurality of through holes in the surface is arranged in the treatment tank.

[0008] The denitrification mechanism comprises a denitrification tower arranged below the treatment tank, the denitrification tower is internally provided with an aerobic nitrification layer, an anoxic denitrification layer and an adsorption safety layer from top to bottom, a porous partition plate with water-permeable holes in the surface is arranged below each layer, an aeration pipe with air holes in the surface is arranged below the aerobic nitrification layer, and a switching structure for switching the water flow direction is arranged below the denitrification tower.

[0009] The purification mechanism comprises a No. 1 tank and a No. 2 tank arranged on one side below the denitrification tower, the No. 1 tank is internally provided with a turbidity removal layer, and the No. 2 tank is internally provided with an iron removal layer.

[0010] Further, the filter cover is a reverse conical structure, and the impurity filter plate is an arc structure.

[0011] Further, a water guide pipe is mounted above the submersible pump, a group of threaded pipes are respectively mounted on the upper and lower sides of the treatment tank, the water outlet end of the water guide pipe is threadedly connected with the upper threaded pipe through a pipe nut, and the lower threaded pipe is threadedly connected with the water inlet end of the denitrification tower through a pipe nut.

[0012] Further, a group of vertical frames are respectively arranged on the two sides of the treatment tank, a fixing ring is mounted on the outer side of the treatment tank, a group of rotating blocks are respectively mounted on the two sides of the fixing ring, a rotary motor is mounted on the upper side of the rear vertical frame, the output shaft of the rotary motor is connected with the rear rotating block, the front rotating block is rotationally connected with the front vertical frame, an outer ring is mounted on the outer side of the upper side of the denitrification tower, and the lower ends of the two groups of vertical frames are fixedly connected with the outer ring.

[0013] Further, the porous partition plate is connected with the inner wall of the denitrification tower, an air inlet joint is mounted on the rear of the denitrification tower and connected with an aeration pipe, and the aeration pipe is in a ring structure and connected with the inner wall of the denitrification tower.

[0014] Further, the aerobic nitrification layer is composed of porous ceramic particles and nitrifying bacteria attached to the porous ceramic particles, the anoxic denitrification layer is composed of slow-release carbon source-limestone composite particles and denitrifying bacteria attached to the slow-release carbon source-limestone composite particles, and the adsorption insurance layer is composed of granular activated carbon, and the functional fillers in each layer are densely stacked above the corresponding porous partition plate, the pore diameter of the water permeable holes on the surface of the porous partition plate is smaller than the minimum particle diameter of the fillers, and the water flow continuously passes through the holes from top to bottom.

[0015] Further, a tower base is arranged below the denitrification tower, two groups of support rings are mounted on the outer side of the denitrification tower, and a plurality of support rods are mounted on the outer side of the support rings, and the lower ends of the support rods are fixedly connected with the tower base.

[0016] Further, the switching structure comprises a three-way valve mounted on the water outlet end of the denitrification tower, an external discharge pipe is mounted on one side of the three-way valve, a base is mounted below the tower base, a drainage pool is formed on one side above the base, one end of the external discharge pipe extends into the upper side of the drainage pool, a water outlet is formed on one side in the drainage pool, and a drainage groove is mounted on one side of the water outlet.

[0017] Further, two groups of support frames are mounted on one side above the base, the No. 1 tank and the No. 2 tank are respectively mounted above the two groups of support frames, the No. 1 tank is arranged in front of the No. 2 tank, the three-way valve is connected with the No. 1 tank through a connecting pipe, the No. 1 tank is connected with the No. 2 tank through a connecting pipe, and a valve is mounted on the water outlet end of the No. 2 tank.

[0018] Further, the turbidity removal layer is filled with quartz sand particles, and the iron removal layer is filled with manganese sand particles.

[0019] Beneficial effects:

[0020] 1. By designing a pretreatment mechanism, the river water is extracted by a submersible pump, and the water flow first passes through the filter cover of the inverted conical structure, the water filtering holes on the surface of which can filter the water grass, and the inclined surface of the inverted cone can make the passing water grass avoid along the inclined surface, effectively preventing the water grass from adhering; then the river water enters the treatment tank through the water guide pipe, and the impurities are filtered through the through holes on the surface of the arc-shaped impurity filter plate, the arc-shaped design expands the filtering area and is not easy to block, thereby realizing pretreatment; when the impurity filter plate needs to be cleaned, only the pipe nut needs to be disassembled, and the treatment tank is driven to rotate to an inclined state, so that the external water body is introduced into the treatment tank through the threaded pipe at the water outlet for backwashing, and the washed impurities are discharged through the threaded pipe at the water inlet in the inclined state, realizing rapid cleaning.

[0021] 2. By designing a denitrification mechanism, the pretreated river water enters the denitrification tower and flows through the aerobic nitrification layer, the anoxic denitrification layer and the adsorption safety layer in turn, wherein the aerobic nitrification layer is subjected to aeration treatment by means of the aeration pipe, which can provide sufficient oxygen for nitrifying bacteria and accelerate the conversion of ammonia nitrogen into nitrate; the anoxic denitrification layer converts nitrate into nitrogen gas by denitrifying bacteria, and the two layers cooperate to greatly improve the denitrification efficiency; the adsorption safety layer can further adsorb residual nitrogen and impurities to ensure the stability of the denitrification effect, the pore size of the water permeable holes on the surface of the porous partition plate is smaller than the minimum particle size of the filler, and the water flow can continuously pass through the holes and the filler gaps from top to bottom, realizing smooth flow and rapid and efficient denitrification treatment.

[0022] 3. By designing a switching structure, the river water after denitrification treatment can be flexibly switched to flow out of the path through the three-way valve, if it needs to be directly discharged into the river, after switching the water outflow path, the water will first enter the drainage pool for temporary buffering, and then smoothly flow into the river through the drainage groove, the nitrogen content of the denitrified water is greatly reduced, which can effectively avoid the eutrophication of the river caused by high nitrogen content and reduce the occurrence of ecological problems such as water bloom, and improve the water quality of the river, if the water quality needs to be further improved, the water will enter the purification mechanism for deep purification treatment after switching the path, meeting the needs of different scenes.

[0023] 4. By designing the purification mechanism, when further purification of the denitrified water is needed, the water pump can be connected with the valve for extracting the denitrified water, so that the denitrified water flows through the No. 1 tank and the No. 2 tank in turn, wherein the quartz sand particles in the No. 1 tank form a turbidity removal layer to complete the turbidity removal and phosphorus removal treatment; the manganese sand particles in the No. 2 tank perform the iron removal, manganese removal and arsenic removal treatment, and after the purification, the water quality can meet the use requirements of municipal greening or road watering, which can effectively improve the water quality and expand the application scenarios of the water body, so as to be used for municipal greening or road watering. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0025] Figure 2 It is a schematic diagram of the structure of another perspective of the present application;

[0026] Figure 3 It is Figure 1 A schematic diagram of the enlarged structure of part A;

[0027] Figure 4 It is a schematic diagram of the structure of the filter cover in the present application;

[0028] Figure 5 It is a schematic diagram of the structure of the processing tank in the present application;

[0029] Figure 6 It is a schematic diagram of the structure of the denitrification tower in the present application;

[0030] Figure 7 It is a schematic diagram of the structure of the side view of the No. 1 tank and the No. 2 tank in the present application.

[0031] In the figure, 1, pretreatment mechanism; 11, filter cover; 12, water guide pipe; 13, submersible pump; 14, water filtering hole; 15, processing tank; 16, vertical frame; 17, outer ring; 18, fixed ring; 19, impurity filter plate; 110, threaded pipe; 111, pipe nut; 112, rotating block; 113, rotary motor;

[0032] 2, denitrification mechanism; 21, denitrification tower; 22, aerobic nitrification layer; 23, anoxic denitrification layer; 24, adsorption safety layer; 25, porous partition; 26, support ring; 27, support rod; 28, three-way valve; 29, tower base; 210, base; 211, drainage pool; 212, water outlet; 213, drainage groove; 214, external drainage pipe; 215, aeration pipe;

[0033] 3, purification mechanism; 31, No. 1 tank; 32, communication pipe; 33, No. 2 tank; 34, valve; 35, support frame; 36, turbidity removal layer; 37, iron removal layer. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0035] Please refer to Figures 1-7 As shown in the figure, a rapid denitrification device for slightly polluted river water comprises:

[0036] The pretreatment mechanism 1 comprises a submersible pump 13, a filter cover 11 is arranged outside the submersible pump 13, a plurality of water filtering holes 14 are formed on the surface of the filter cover 11, a rotatable treatment tank 15 is arranged above the submersible pump 13, and an impurity filter plate 19 with a plurality of through holes on the surface is arranged in the treatment tank 15. The submersible pump 13 is used for pumping river water, the water filtering holes 14 on the surface of the filter cover 11 can filter waterweeds, and the impurity filter plate 19 is used for filtering impurities, so as to realize pretreatment of the river water. The treatment tank 15 can be rotated to facilitate cleaning of the impurity filter plate 19.

[0037] The denitrification mechanism 2 comprises a denitrification tower 21 arranged below the treatment tank 15. The denitrification tower 21 comprises, from top to bottom, an aerobic nitrification layer 22, an anoxic denitrification layer 23 and an adsorption safety layer 24. A plurality of porous partitions 25 with water permeable holes are arranged below each layer. An aeration pipe 215 is arranged below the aerobic nitrification layer 22, and the aeration pipe 215 has air holes on the surface. A switching structure is arranged below the denitrification tower 21 to switch the flow direction of water. The aerobic nitrification layer 22, the anoxic denitrification layer 23 and the adsorption safety layer 24 work together to realize denitrification. The porous partitions 25 are used for bearing fillers of each layer and allowing water to flow through the water permeable holes. The aeration pipe 215 provides oxygen for the aerobic nitrification layer 22 through the air holes. The switching structure is used for switching the flow direction of water after denitrification.

[0038] The purification mechanism 3 comprises a first tank 31 and a second tank 33 arranged on one side below the denitrification tower 21. The first tank 31 is provided with a turbidity removal layer 36, and the second tank 33 is provided with an iron removal layer 37. The first tank 31 and the turbidity removal layer 36 are used for removing turbidity and phosphorus. The second tank 33 and the iron removal layer 37 are used for removing iron, manganese and arsenic, so as to further purify the water after denitrification.

[0039] Please refer to Figure 1 , Figure 4 and Figure 5 As shown in the figure, the filter cover 11 is in a reverse conical structure, and the impurity filter plate 19 is in an arc structure. The reverse conical structure of the filter cover 11 can avoid waterweeds from adhering, and the arc structure of the impurity filter plate 19 can expand the filtering area and is not easy to be blocked.

[0040] Please refer to Figure 1 ,Figure 2 as well as Figure 5 As shown, a water guide pipe 12 is installed above the submersible pump 13, and a set of threaded pipes 110 are installed on the upper and lower sides of the treatment tank 15 respectively. The water outlet end of the water guide pipe 12 is threadedly connected to the upper threaded pipe 110 through a pipe nut 111, and the lower threaded pipe 110 is threadedly connected to the water inlet end of the denitrification tower 21 through a pipe nut 111. The water guide pipe 12 is used to transport the pumped river water. The connection method of the threaded pipe 110 and the pipe nut 111 facilitates the installation and disassembly of the treatment tank 15, the water guide pipe 12, and the denitrification tower 21.

[0041] Please see Figures 1-3 As shown, a set of upright frames 16 are provided on both sides of the treatment tank 15. A fixing ring 18 is installed on the outside of the treatment tank 15, and a set of rotating blocks 112 are installed on both sides of the fixing ring 18. A rotary motor 113 is installed on the top of the rear upright frame 16, and the output shaft of the rotary motor 113 is connected to the rear rotating block 112. The front rotating block 112 is rotatably connected to the front upright frame 16. An outer ring 17 is installed on the outer side of the top of the denitrification tower 21, and the lower ends of the two sets of upright frames 16 are fixedly connected to the outer ring 17. The fixing ring 18 and the rotating blocks 112, together with the rotary motor 113, can drive the treatment tank 15 to rotate, which facilitates the cleaning of the impurity filter plate 19.

[0042] Please see Figure 6 As shown, the porous baffle 25 is connected to the inner wall of the denitrification tower 21. An air inlet connector is installed after the denitrification tower 21 and is connected to the aeration pipe 215. The aeration pipe 215 has an annular structure and its outer side is connected to the inner wall of the denitrification tower 21. The porous baffle 25 supports each layer of packing. The air inlet connector is used to connect to an external air source and introduce gas into the aeration pipe 215. The annular structure of the aeration pipe 215 can make the aeration more uniform and provide sufficient oxygen for the aerobic nitrification layer 22.

[0043] Please see Figure 6As shown, the aerobic nitrification layer 22 is composed of porous ceramic particles and the attached nitrifying bacteria, the anoxic denitrification layer 23 is composed of slow-release carbon source-limestone composite particles and the attached denitrifying bacteria, and the adsorption safety layer 24 is composed of granular activated carbon. The functional fillers of each layer are densely stacked above the corresponding porous partition plate 25. The pore size of the water permeable holes on the surface of the porous partition plate 25 is smaller than the minimum particle size of the fillers. The water flows continuously through the holes from top to bottom. In the aerobic nitrification layer 22, the porous ceramic particles provide an attachment carrier for nitrifying bacteria. Under the action of oxygen input by the aeration pipe 215, the nitrifying bacteria gradually oxidize ammonia nitrogen in the water into nitrate through biochemical reactions. In the anoxic denitrification layer 23, the slow-release carbon source-limestone composite particles provide carbon source and suitable acid-base environment for denitrifying bacteria. The denitrifying bacteria reduce nitrate to nitrogen gas under anoxic conditions and release it into the air. The granular activated carbon in the adsorption safety layer 24 captures residual nitrogen compounds and small impurities in the water through physical adsorption due to its porous structure. The water permeable holes of the porous partition plate 25 prevent the fillers from leaking and ensure the flow of water.

[0044] As shown in Figures 1-2 As shown, the denitrification tower 21 is provided below with a tower seat 29, and two groups of support rings 26 are installed on the outer side of the denitrification tower 21. A plurality of groups of support rods 27 are installed on the outer side of the support rings 26, and the lower ends of the support rods 27 are fixedly connected with the tower seat 29.

[0045] As shown in Figures 1-2 As shown, the switching structure includes a three-way valve 28 installed at the water outlet end of the denitrification tower 21. The three-way valve 28 is provided with an external discharge pipe 214 on one side. A base 210 is installed below the tower seat 29. A drainage tank 211 is formed on one side above the base 210. One end of the external discharge pipe 214 extends into the upper part of the drainage tank 211. A water outlet 212 is formed on one side in the internal part of the drainage tank 211. A drainage groove 213 is installed on one side of the water outlet 212. The three-way valve 28 switches the flow direction of the water after denitrification. The external discharge pipe 214 guides the water into the drainage tank 211. The drainage tank 211 buffers the water. The water is discharged into the river again through the water outlet 212 and the drainage groove 213.

[0046] As shown in Figures 1-2 As shown, two groups of support frames 35 are installed on one side above the base 210. A first tank 31 and a second tank 33 are respectively installed above the two groups of support frames 35. The first tank 31 is arranged in front of the second tank 33. The three-way valve 28 is connected with the first tank 31 through a communication pipe 32. The first tank 31 is connected with the second tank 33 through a connecting pipe. A valve 34 is installed at the water outlet end of the second tank 33.

[0047] As shown in Figure 7As shown, the turbidity removal layer 36 is filled with quartz sand particles, and the iron removal layer 37 is filled with manganese sand particles. The turbidity removal layer 36 made of quartz sand particles has a large specific surface area and a porous structure, and can adsorb and intercept the turbidity substances in the water to remove turbidity, and can also adsorb phosphorus elements to remove phosphorus. In the iron removal layer 37 made of manganese sand particles, the manganese dioxide oxidizes the divalent iron and manganese ions into precipitates and intercepts them. The porous structure and surface properties of the iron removal layer 37 can also remove arsenic through adsorption and precipitation, thereby improving the quality of the water body.

[0048] In specific use, the working principle of the present application is as follows:

[0049] In use, the river water is first pumped out by the submersible pump 13, and the water flow first passes through the filter cover 11 with an inverted conical structure. The water filtering holes 14 on the surface of the filter cover 11 filter the water plants, and the inclined surface of the inverted cone allows the passing water plants to avoid the inclined surface, effectively preventing the water plants from adhering. Subsequently, the river water enters the treatment tank 15 through the water guide pipe 12, and the impurities are filtered through the through holes on the surface of the arc-shaped impurity filter plate 19. The arc-shaped design expands the filtering area and is not easy to be blocked, thereby achieving pretreatment.

[0050] The pretreated river water enters the denitrification tower 21 through the water inlet end of the denitrification tower 21, and sequentially flows through the aerobic nitrification layer 22, the anoxic denitrification layer 23, and the adsorption safety layer 24. The aerobic nitrification layer 22 is composed of porous ceramic particles and nitrifying bacteria attached thereto. An external air pump can be connected to the air inlet joint to introduce gas into the aeration pipe 215, so that the gas is discharged through the air pipe to perform aeration treatment, thereby providing sufficient oxygen for the nitrifying bacteria and accelerating the conversion of ammonia nitrogen into nitrate. The anoxic denitrification layer 23 is composed of slow-release carbon source-limestone composite particles and denitrifying bacteria attached thereto. The denitrifying bacteria convert nitrate into nitrogen gas for removal. The adsorption safety layer 24 is composed of granular activated carbon, which further adsorbs residual nitrogen and impurities. The functional fillers in each layer are densely stacked above the corresponding porous partition plate 25. The pore size of the water permeable holes on the surface of the porous partition plate 25 is smaller than the smallest particle size of the fillers to prevent the fillers from leaking out. The water flow continuously passes through the holes and the gaps between the fillers from top to bottom, and the three layers work together to greatly improve the denitrification efficiency, ensure the stability of the denitrification effect, and achieve rapid and efficient denitrification treatment.

[0051] The river water treated by the denitrification treatment device flows downwards to the water outlet end in the denitrification tower 21, and can be switched to flow out through the three-way valve 28 of the switching structure: if it is needed to be directly discharged into the river, after switching, the water flows into the drainage tank 211 through the discharge pipe 214 for temporary buffering, and then flows into the drainage groove 213 through the water outlet 212 and into the river, the nitrogen content of the water after denitrification is greatly reduced, which can effectively avoid river eutrophication and reduce ecological problems such as water bloom, and improve the water quality of the river; if it is needed to further improve the water quality, after switching, the water flows into the purification mechanism 3 through the connecting pipe 32, the water pump and the valve 34 can be connected to extract the water after denitrification, so that the water flows through the first tank 31 and the second tank 33 in sequence, wherein the quartz sand particles in the first tank 31 form a turbidity removal layer 36 to complete the turbidity removal and phosphorus removal treatment; the manganese sand particles in the second tank 33 form an iron removal layer 37 to complete the iron removal, manganese removal and arsenic removal treatment, and after the purification, the water quality can meet the use requirements of municipal greening or road watering, effectively improving the water quality and expanding the application scenarios of the water body.

[0052] In addition, when the impurity filter plate 19 needs to be cleaned, the pipe nut 111 is disassembled, so that the upper and lower two groups of threaded pipes 110 are disconnected from the water guide pipe 12 and the water inlet end of the denitrification tower 21, and then the rotating motor 113 drives the rotating block 112 to rotate, drives the treatment tank 15 to rotate to an inclined state, and the external water body is introduced into the treatment tank 15 through the threaded pipe 110 at the water outlet to perform backwashing on the impurity filter plate 19, and the washed impurities are discharged through the threaded pipe 110 at the water inlet in the inclined state, so that rapid cleaning is realized.

[0053] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application; the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device.

[0054] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since numerous changes, modifications, substitutions and alterations can be made thereto without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A device for rapid denitrification of micro-polluted river water, characterized in that, Include: Preprocessing mechanism (1), including submersible pump (13), the submersible pump (13) outside is equipped with filter cover (11), and the filter cover (11) surface is provided with a plurality of groups of water filter hole (14), the submersible pump (13) is equipped with rotatable processing tank (15) above, the processing tank (15) is installed with the impurity filter plate (19) with a plurality of groups of through holes on the surface;The filter cover (11) is inverted conical structure, the impurity filter plate (19) is arc structure; Denitrification mechanism (2), including denitrification tower (21) arranged below processing tank (15), the denitrification tower (21) is internally provided with aerobic nitrification layer (22), anoxic denitrification layer (23) and adsorption security layer (24) from top to bottom, and each layer is provided with porous partition (25) with water permeable hole on the surface below, the aerobic nitrification layer (22) is provided with aeration pipe (215) below, and the aeration pipe (215) is provided with air hole on the surface, the denitrification tower (21) is provided with switching structure for switching water flow direction below; The porous partition (25) is connected with the inner wall of the denitrification tower (21), the denitrification tower (21) is installed with air inlet joint behind, and the air inlet joint is connected with the aeration pipe (215), the aeration pipe (215) is annular structure, and the outer side is connected with the inner wall of the denitrification tower (21); The switching structure includes three-way valve (28) installed at the water outlet end of the denitrification tower (21), one side of the three-way valve (28) is installed with external discharge pipe (214), the tower base (29) is installed with base (210) below, one side of the base (210) is provided with drainage tank (211) above, and one end of the external discharge pipe (214) extends into the drainage tank (211) above, one side of the drainage tank (211) is provided with water outlet (212) inside, and the water outlet (212) is installed with drainage groove (213) on one side; Purification mechanism (3), including a number of tanks (31) and two number of tanks (33) arranged on one side below the denitrification tower (21), the a number of tanks (31) are provided with turbidity removal layer (36), the two number of tanks (33) are provided with iron removal layer (37).

2. The device for rapid denitrification of micro-polluted river water according to claim 1, characterized in that: The submersible pump (13) is installed with water guide pipe (12) above, a group of threaded pipes (110) are installed on the upper and lower sides of the processing tank (15), the water outlet end of the water guide pipe (12) is connected with the upper threaded pipe (110) through pipe nut (111), and the lower threaded pipe (110) is connected with the water inlet end of the denitrification tower (21) through pipe nut (111).

3. A device for rapid denitrification of micro-polluted river water as claimed in claim 1, wherein: The processing tank (15) is provided with a group of vertical frames (16) on both sides, the processing tank (15) is installed with fixing ring (18) outside, the fixing ring (18) is installed with a group of rotating blocks (112) on both sides, the rotating motor (113) is installed above the vertical frame (16) behind, and the output shaft of the rotating motor (113) is connected with the rear rotating block (112), the front rotating block (112) is connected with the front vertical frame (16) rotatably, the denitrification tower (21) is installed with outer ring (17) outside above, and the lower ends of the two groups of vertical frames (16) are fixedly connected with the outer ring (17).

4. A device for rapid denitrification of micro-polluted river water as claimed in claim 1, wherein: The aerobic nitrification layer (22) is composed of porous ceramic particles and nitrifying bacteria attached thereto, the anoxic denitrification layer (23) is composed of slow-release carbon source-limestone composite particles and denitrifying bacteria attached thereto, and the adsorption insurance layer (24) is composed of granular activated carbon.

5. A device for rapid denitrification of micro-polluted river water as claimed in claim 1, wherein: The denitrification tower (21) is provided below with a tower base (29), and two groups of support rings (26) are installed outside the denitrification tower (21), and a plurality of groups of support rods (27) are installed outside the support rings (26), and the lower ends of the support rods (27) are fixedly connected with the tower base (29).

6. A device for rapid denitrification of micro-polluted river water as claimed in claim 1 wherein: Two groups of support frames (35) are installed on one side above the base (210), and a first tank (31) and a second tank (33) are respectively installed above the two groups of support frames (35), the first tank (31) is arranged in front of the second tank (33), a three-way valve (28) is connected with the first tank (31) through a communication pipe (32), the first tank (31) is connected with the second tank (33) through a connecting pipe, and a valve (34) is installed at the water outlet of the second tank (33).

7. A device for rapid denitrification of micro-polluted river water as claimed in claim 1 wherein: The turbidity removal layer (36) is made of quartz sand particles, and the iron removal layer (37) is made of manganese sand particles.

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