A carbon-free nitrogen removal device for wastewater treatment

Abstract

This invention relates to the field of wastewater treatment, and more particularly to a carbon-source-free denitrification device for wastewater treatment. The device includes a sand filter with a ladder platform fixedly installed at the top. The sand filter includes a central sedimentation chamber, with filtration chambers on both sides. An overflow weir is installed on the side wall of each filtration chamber. The top of each filtration chamber is connected to the overflow weir via a water channel, and a filter drain pipe is connected to the bottom of the overflow weir. Evenly spaced conical concrete layers are arranged at the bottom of each filtration chamber. A filter media layer is also filled inside each filtration chamber. Inlet pipes are connected to both sides of the sedimentation chamber, leading to the corresponding filtration chamber. This invention, through a rational layout and unified allocation of multiple sets of continuous backwash filters, enables the integrated treatment process of wastewater sedimentation, continuous filtration, and filter media backwashing using a single sand filter, significantly reducing the cost of wastewater treatment projects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, and particularly relates to a sewage treatment carbon-free denitrification device. BACKGROUND

[0002] Sewage treatment is a purification process for making sewage meet the water quality requirements for discharge into water bodies or reuse, and its core is to remove pollutants through physical, chemical and biological methods to protect the ecological environment and realize water resource recycling.

[0003] Sand filter tank is a key technical unit in sewage treatment, which can remove suspended solids, microorganisms and nitrogen and phosphorus pollutants through physical filtration and biological action, and has the advantages of high efficiency, stability and easy maintenance, and is widely used in urban sewage, industrial wastewater and resource recycling scenes. The main defect of the existing sand filter device is high cost, most of the components are one-piece structure, and the whole needs to be replaced after damage, resulting in high maintenance cost. SUMMARY

[0004] The present application relates to the technical field of sewage treatment, and particularly relates to a sewage treatment carbon-free denitrification device.

[0005] The present application relates to the technical field of sewage treatment, and particularly relates to a sewage treatment carbon-free denitrification device.

[0006] A sewage treatment carbon-free denitrification device, comprising a sand filter tank, a staircase platform is fixedly arranged at the top end of the sand filter tank, the sand filter tank comprises a middle sedimentation chamber, filter chambers are arranged on both sides of the sedimentation chamber, an overflow weir is arranged on the side wall of the filter chamber, the filter chamber is communicated with the overflow weir through a water channel at the top, a filter drainage pipe is communicated and arranged at the bottom of the overflow weir, conical concrete pouring layers are uniformly arranged at the bottom of the filter chamber at equal intervals, a filter material layer is further filled and arranged in the filter chamber, water inlet pipes are communicated and arranged on both sides of the sedimentation chamber, the water inlet pipes are communicated into the corresponding filter chambers, electric control valves are arranged on the water inlet pipes, a plurality of continuous washing filters are uniformly and communicated arranged on both sides of the water inlet pipes through water inlet branch pipes at equal intervals, each continuous washing filter is arranged between adjacent two concrete pouring layers, washing drainage pipes are fixedly arranged on both sides of the sand filter tank, the washing drainage pipes are communicated with each continuous washing filter through drainage branch pipes, a sewage discharge pipe is communicated and arranged on the side wall of the sedimentation chamber, and a sewage cleaning assembly is arranged in the sedimentation chamber.

[0007] As a further scheme of the present application: the continuous washing filter comprises a shunt pipe, a gas path sleeve and a lifting pipe arranged concentrically from outside to inside, the shunt pipe is communicated with the water inlet branch pipe, a water distributor is fixedly arranged at the bottom of the shunt pipe, a distribution cone is fixedly arranged on the outer wall of the gas path sleeve, the distribution cone is below the water distributor, a lifting pump is arranged at the bottom of the gas path sleeve, the lifting pipe is penetrated from the gas path sleeve at both top and bottom ends, a water collecting cylinder is arranged outside the top end of the lifting pipe, the water collecting cylinder is communicated with the water outlet branch pipe, a corrugated washing pipe is fixedly arranged in the water collecting cylinder.

[0008] As a further scheme of the present application: the corrugated washing pipe is arranged concentrically outside the top end of the gas path sleeve, a material blocking sleeve is arranged in the water collecting cylinder, the material blocking sleeve is fixedly arranged at the top end of the corrugated washing pipe, a gas pump is fixedly arranged in the material blocking sleeve, the gas pump is communicated with the gas path sleeve through a gas pipe.

[0009] As a further scheme of the present application: the inner cavity passage of the gas path sleeve is communicated with the lifting pump, a water suction filter screen is arranged at the connection between the lifting pump and the lifting pipe, a gas hole is penetrated through the pipe wall of the lifting pipe corresponding to the water suction filter screen, the diameter of the gas hole is smaller than the particle size of the filter material used in the filter material layer.

[0010] As a further scheme of the present application: the top end of the lifting pipe extends into the material blocking sleeve, the top end of the corrugated washing pipe is lower than the height of the water collecting cylinder, the highest part of the filter material layer is lower than the bottom end of the corrugated washing pipe.

[0011] As a further scheme of the present application: the cleaning assembly comprises a driving cylinder, the driving cylinder is fixedly installed on the escalator platform, a sliding support is arranged between the bottom of the sedimentation chamber and the escalator platform, a lifting block is slidingly installed in the sliding support, the output end of the driving cylinder is connected with the lifting block, the bottom of the lifting block is connected with the sliding support through a return spring, frames are fixedly connected to both ends of the lifting block, the frames are matched with the inner cavity four walls of the sedimentation chamber, both sides of the lifting block are rotatably connected with one end of a connecting rod, the other end of the connecting rod is rotatably connected with a sliding seat, the sliding seat is symmetrically arranged at both ends of the bottom of the sedimentation chamber.

[0012] As a further scheme of the present application: a first scraping strip is arranged on the outer wall of the frame, the first scraping strip is abutted with the side wall of the sedimentation chamber, a second scraping strip is arranged on the bottom of the sliding seat, the second scraping strip is abutted with the bottom of the sedimentation chamber.

[0013] As a further scheme of the present application: sliding grooves are arranged on the inner walls of both sides of the sedimentation chamber, both ends of the sliding seat are slidingly installed in the sliding grooves.

[0014] As a further scheme of the present application: the filter material used in the filter material layer is self-nourishing denitrification filter material.

[0015] The beneficial effects of the present application are:

[0016] (1) By setting the sedimentation chamber, filter chamber and overflow weir, the sewage is first introduced into the filter chamber for preliminary sedimentation, the sedimented sewage is introduced into the filter material layer through the water inlet pipe and the water inlet branch pipe, the filter material layer is used for filtering and adsorbing the sewage, the purified filtrate floats above the filter material layer and flows to the overflow weir through the water channel for discharge, and the contaminated filter material after filtering and adsorption of the filter material layer continuously sinks and is continuously washed and purified by the continuous washing filter, the sewage for washing the filter material is discharged separately through the washing drain pipe, the water inlet pipe, the filter drain pipe and the washing drain pipe are reasonably distributed and arranged, the pool body space is effectively utilized, and each group of continuous washing filters can realize complete filtering and purifying function, and through reasonable layout and unified deployment of multiple groups of continuous washing filters, the sedimentation, continuous filtration and filter material washing integrated treatment process of the sewage can be realized by using a single sand filter tank, and the construction cost of the sewage treatment project is greatly reduced.

[0017] (2) By setting the continuous washing filter, the filter material at the bottom is sucked into the lifting pipe and continuously lifted upwards, in the process of lifting the filter material upward by compressed air, the filter material continuously collides and rubs in the lifting pipe for preliminary cleaning, when the filter material is lifted to the top chamber of the lifting pipe, the filter material falls into the corrugated washing pipe under the action of gravity, a small amount of clean water continuously floats from the inner cavity of the corrugated washing pipe, the clean water performs multiple folding and countercurrent washing processes on the filter material falling from the top, and the cleaned filter material falls on the top of the filter material layer again, so that the filter material layer can maintain high adsorption and filtration performance, and in the washing process, the waterway, the airway and the filter material flow synchronously, so that the continuous washing filter can realize the coagulation, clarification and filtration process.

[0018] (3) By setting the cleaning assembly, the driving cylinder drives the lifting block to move up and down along the sliding support, the lifting block drives the frame to move synchronously, and the lifting block drives the sliding seat to move reciprocatingly at the bottom of the sedimentation tank through the connecting rod, at this time, the first scraper can scrape and clean the attachments on the side wall of the sedimentation tank, and the second scraper can scrape the sedimented dirt at the bottom of the sedimentation chamber, the scraped dirt is discharged through the drain pipe, so that the comprehensive and effective cleaning process of the sedimentation tank is realized, and the sewage sedimentation and purification effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be further described below with reference to the drawings.

[0020] Figure 1 is the overall structure schematic diagram of the present application.

[0021] Figure 2 is Figure 1A-A direction cross-sectional view.

[0022] Figure 3 is Figure 1 B-B direction cross-sectional view.

[0023] Figure 4 is the distribution diagram of the continuous flow sand filter in the present application.

[0024] Figure 5 is the structure diagram of the water inlet pipe in the present application.

[0025] Figure 6 is the internal diagram of the continuous flow sand filter in the present application.

[0026] Figure 7 is the working diagram of the continuous flow sand filter in the present application.

[0027] Figure 8 is Figure 7 enlarged view at A.

[0028] Figure 9 is Figure 7 enlarged view at B.

[0029] Figure 10 is the structure diagram of the cleaning and pollution assembly in the present application.

[0030] In the figure: 1, sand filter tank; 11, sedimentation chamber; 111, sliding groove; 112, sewage pipe; 12, filter chamber; 13, overflow weir; 131, filter drainage pipe; 14, water passage; 2, staircase platform; 3, concrete pouring layer; 4, filter material layer; 5, water inlet pipe; 51, water inlet branch pipe; 52, electric control valve; 6, continuous washing filter; 61, shunt pipe; 611, water distributor; 62, air path sleeve; 621, material distribution cone hopper; 622, lifting pump; 623, water suction filter screen; 63, lifting pipe; 631, air hole; 64, water collecting cylinder; 65, corrugated washing pipe; 651, material blocking sleeve; 652, air pump; 653, air pipe; 7, cleaning and pollution assembly; 71, driving cylinder; 72, sliding support; 73, lifting block; 74, reset spring; 75, frame; 751, first scraping strip; 76, connecting rod; 77, sliding seat; 772, second scraping strip; 8, washing drainage pipe; 81, drainage branch pipe. DETAILED DESCRIPTION

[0031] 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. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0032] Referring to Figures 1-5 As shown in the drawings, the present application is a sewage treatment carbon-free denitrification device, comprising a sand filter tank 1, a staircase platform 2 is fixedly arranged at the top end of the sand filter tank 1, the sand filter tank 1 comprises a middle sedimentation chamber 11, filter chambers 12 are arranged on both sides of the sedimentation chamber 11, an overflow weir 13 is arranged on the side wall of the filter chamber 12, the filter chamber 12 is communicated with the overflow weir 13 through a water channel 14 at the top, a filter drainage pipe 131 is communicated and arranged at the bottom of the overflow weir 13, conical concrete pouring layers 3 are evenly and equidistantly arranged at the bottom of the filter chamber 12, a filter material layer 4 is also filled and arranged in the filter chamber 12, water inlet pipes 5 are communicated and arranged on both sides of the sedimentation chamber 11, the water inlet pipes 5 are connected into the corresponding filter chambers 12, electric control valves 52 are arranged on the water inlet pipes 5, a plurality of continuous washing filters 6 are evenly and equidistantly communicated and arranged on both sides of the water inlet pipes 5 through water inlet branch pipes 51, each continuous washing filter 6 is arranged between two adjacent concrete pouring layers 3, washing drainage pipes 8 are fixedly arranged on both sides of the sand filter tank 1, the washing drainage pipes 8 are communicated with each continuous washing filter 6 through drainage branch pipes 81, a blowdown pipe 112 is communicated and arranged on the side wall of the sedimentation chamber 11, and a sewage cleaning assembly 7 is arranged in the sedimentation chamber 11.

[0033] Specifically, by arranging the sedimentation chamber 11, the filter chamber 12 and the overflow weir 13, sewage is first connected into the filter chamber 12 for preliminary sedimentation, the sedimented sewage is connected into the filter material layer 4 through the water inlet pipe 5 and the water inlet branch pipe 51, the filter material layer 4 is used for filtering and adsorbing the sewage, the purified filtrate floats above the filter material layer 4 and is discharged through the water channel 14 and the overflow weir 13, and the contaminated filter material after being filtered and adsorbed by the filter material layer 4 continuously sinks and is continuously washed and purified by the continuous washing filter 6, the sewage for washing the filter material is discharged separately through the washing drainage pipe 8, the water inlet pipe 5, the filter drainage pipe 131 and the washing drainage pipe 8 are rationally distributed and arranged, the pool body space is effectively utilized, each group of continuous washing filters 6 can realize complete filtering and purifying function, and by rationally arranging and uniformly deploying a plurality of groups of continuous washing filters 6, the sedimentation, continuous filtration and filter material washing integrated treatment process of sewage can be realized by using a single sand filter tank 1, and the construction cost of the sewage treatment project is greatly reduced.

[0034] As Figures 6-9As shown, the continuous flushing filter 6 includes a diversion pipe 61, an air passage sleeve 62, and a riser pipe 63 arranged concentrically from the outside to the inside. The diversion pipe 61 is connected to the water inlet branch pipe 51. A water distributor 611 is fixedly installed at the bottom of the diversion pipe 61. A material distribution cone 621 is fixedly installed on the outer wall of the air passage sleeve 62. The material distribution cone 621 is located below the water distributor 611. A riser pump 622 is installed at the bottom of the air passage sleeve 62. The upper and lower ends of the riser pipe 63 both extend out of the air passage sleeve 62. A water collection cylinder 64 is installed on the outer side of the top of the riser pipe 63. The water collection cylinder 64 is connected to the drain branch pipe 81. A corrugated flushing pipe 65 is fixedly installed inside the water collection cylinder 64.

[0035] Furthermore, the corrugated flushing pipe 65 is concentrically arranged on the outer side of the top end of the air circuit sleeve 62, and a baffle sleeve 651 is provided inside the water collection cylinder 64. The baffle sleeve 651 is fixedly installed at the top end of the corrugated flushing pipe 65, and an air pump 652 is fixedly installed inside the baffle cylinder. The air pump 652 is connected to the air circuit sleeve 62 through the air pipe 653.

[0036] Specifically, by setting up a continuous flushing filter 6, sewage is introduced into the diversion pipe 61 through the inlet branch pipe 51, and is evenly distributed in the filter media layer 4 by the water distributor 611. Then, it flows upward in reverse to the filter media layer 4, using the filter media layer 4 to intercept and filter impurities in the sewage. The contaminated filter media in the filter media layer 4 will gradually sink down along the distribution cone 621 to the bottom of the riser pipe 63. At this time, the air pump 652 draws air from the air circuit sleeve 62 through the air pipe 653. At the same time, the riser pump 622 creates a negative pressure in the riser pipe 63 under the action of compressed air, so that the filter media at the bottom is sucked into the riser pipe 63 and continuously lifted upward. During the process of the compressed air lifting the filter media, the filter media will continuously collide and rub in the riser pipe 63 for preliminary cleaning. When the filter media is lifted to the top chamber of the riser pipe 63, the filter media will fall into the corrugated flushing pipe 65 under the action of gravity. Figure 9 The solid arrow in the center indicates the flow direction of the filter media. A small amount of clean water will continuously rise from the inner cavity of the corrugated flushing pipe 65. During this process, the clean water will repeatedly fold and counter-current to flush the filter media falling from the top. The cleaned filter media will fall back to the top of the filter media layer 4, while the flushing wastewater containing a large amount of suspended solids will be discharged from the top of the flushing corrugated pipe into the water collection cylinder 64 and discharged through the drain branch pipe 81. Figure 9 (The hollow arrow indicates the direction of water flow). During this process, the water path, air path, and filter media flow synchronously, enabling the continuous flushing filter 6 to fully realize the coagulation, clarification, and filtration processes.

[0037] It should be noted that the air pump 652 in this embodiment is connected to the background control system. By controlling and adjusting the amount and pressure of compressed air, the speed of filter media circulation and the rinsing intensity can be adjusted.

[0038] like Figure 8As shown, the inner cavity passage of the air path sleeve 62 is communicated with the lifting pump 622, and the lifting pump 622 is provided with a water suction filter screen 623 at the connection position of the lifting pump 622 and the lifting pipe 63. The lifting pipe 63 is provided with air holes 631 penetrating through the pipe wall corresponding to the water suction filter screen 623, and the diameter of the air holes 631 is smaller than the particle size of the filter material used in the filter material layer 4.

[0039] Specifically, by arranging the water suction filter screen 623, the compressed air forms a negative pressure effect in the lifting pipe 63 through the air holes 631 during the operation of the lifting pump 622, so that the filter material is continuously lifted upward. Since the diameter of the air holes 631 is smaller than the particle size of the filter material used in the filter material layer 4, the filter material can be prevented from entering the lifting pump 622 and the air path sleeve 62 to cause blockage. At the same time, the water suction filter screen 623 can effectively adsorb the moisture contained in the filter material to prevent the moisture from entering the lifting pump 622.

[0040] As shown in Figure 7 and Figure 9 , the top end of the lifting pipe 63 extends into the material blocking sleeve 651, the top end of the corrugated flushing pipe 65 is lower than the height of the water collecting cylinder 64, and the highest position of the filter material layer 4 is lower than the bottom end of the corrugated flushing pipe 65. The purpose of this design is that when the filter material emerges from the top of the lifting pipe 63, it will be blocked by the material blocking sleeve 651, so that the filter material can smoothly fall into the flushing corrugated pipe, and at the same time, the overflow of the filter material into the water collecting cylinder 64 can be avoided.

[0041] As shown in Figure 3 and Figure 10 , the cleaning assembly 7 includes a driving cylinder 71 fixedly installed on the escalator platform 2. A sliding bracket 72 is arranged between the bottom of the sedimentation chamber 11 and the escalator platform 2. A lifting block 73 is slidingly installed in the sliding bracket 72. The output end of the driving cylinder 71 is connected with the lifting block 73. The bottom of the lifting block 73 is connected with the sliding bracket 72 through a return spring 74. The lifting block 73 is fixedly connected with a frame 75 at both ends. The frame 75 is matched with the inner cavity walls of the sedimentation chamber 11. The lifting block 73 is rotatably connected with one end of a connecting rod 76 at both sides. The other end of the connecting rod 76 is rotatably connected with a sliding seat 77. The sliding seat 77 is symmetrically arranged at both ends of the bottom of the sedimentation chamber 11.

[0042] Further, a first scraping strip 751 is arranged on the outer wall of the frame 75, and the first scraping strip 751 abuts against the side wall of the sedimentation chamber 11. A second scraping strip 772 is arranged on the bottom of the sliding seat 77, and the second scraping strip 772 abuts against the bottom of the sedimentation chamber 11.

[0043] Still further, sliding grooves 111 are arranged on the inner walls of both sides of the sedimentation chamber 11, and the sliding seat 77 is slidingly installed in the sliding grooves 111.

[0044] Specifically, by setting the cleaning assembly 7, the driving cylinder 71 drives the lifting block 73 to move up and down along the sliding support 72, the lifting block 73 drives the frame 75 to realize synchronous displacement, and the lifting block 73 drives the sliding seat 77 to reciprocate at the bottom of the sedimentation tank through the connecting rod 76, at this time, the first scraping strip 751 can scrape and clean the attachments on the side wall of the sedimentation tank, and the second scraping strip 772 can scrape the sediment dirt at the bottom of the sedimentation chamber 11, the scraped dirt is discharged through the dirt outlet pipe 112, so that the comprehensive and effective cleaning process of the sedimentation tank is realized, and the sewage sedimentation purification effect is improved.

[0045] In the embodiment, the filter material of the filter material layer 4 is autotrophic denitrification filter material. The autotrophic denitrification filter material is based on sulfur autotrophic denitrification technology, that is, taking carbon dioxide, carbonate and bicarbonate as inorganic carbon source, taking reduced inorganic matter as electron donor, and reducing nitrate nitrogen in low carbon-nitrogen ratio water body lacking organic carbon source into nitrogen. The autotrophic active filter material with a particle size of 2-3 mm is selected, and the effluent TN is less than or equal to 10 mg / L, and zero carbon source is added, which helps to reduce carbon emission. The downward flow autotrophic denitrification filter tank has a hydraulic retention time of about 20 min, when the influent DO is higher than 4 mg / L, the average denitrification concentration is still 8.50 mg / L, the denitrification rate is 67%, and the denitrification load is 0.64 kg / (m3.d). Compared with heterotrophic denitrification, the consumption of the autotrophic denitrification can be reduced by 30%-50%, and the influent DO of the denitrification filter tank should be controlled to be less than or equal to 2 mg / L.

[0046] The working principle of the present application is as follows: Figures 1-10As shown, in use, sewage is first introduced into the filter chamber 12 for preliminary sedimentation, and the sedimented sewage is introduced into the distribution pipe 61 through the water inlet pipe 5 and the water inlet branch pipe 51, and is uniformly distributed in the filter material layer 4 through the water distributor 611, and then flows upward through the filter material layer 4 in a reverse direction, and the impurities in the sewage are intercepted and filtered by the filter material layer 4, and the filtered filtrate floats above the filter material layer 4 and flows through the water channel 14 to the overflow weir 13 for discharge. The contaminated filter material in the filter material layer 4 will gradually sink to the bottom of the lifting pipe 63 along the material distribution cone 621, at this time the air pump 652 draws air from the air path sleeve 62 through the air pipe 653, and the lifting pump 622 forms a negative pressure in the lifting pipe 63 under the action of compressed air, so that the filter material at the bottom is sucked into the lifting pipe 63 and continuously lifted upward, in the process of lifting the filter material upward by compressed air, the filter material will continuously collide and rub in the lifting pipe 63 for preliminary cleaning, when the filter material is lifted to the top chamber of the lifting pipe 63, the filter material will fall into the corrugated washing pipe 65 under the action of gravity, and a small amount of clean water will continuously float up in the inner cavity of the corrugated washing pipe 65, in this process, the clean water will perform multiple washing processes of turning and flowing in a reverse direction on the filter material falling from the top, and the cleaned filter material will fall again on the top of the filter material layer 4, and the washing wastewater containing a large amount of suspended solids will be discharged from the top of the washing corrugated pipe into the water collecting cylinder 64, and then discharged through the drain branch pipe 81. By reasonably arranging and uniformly deploying multiple groups of continuous washing filters 6, the single sand filter tank 1 can realize the integrated treatment process of sewage sedimentation, continuous filtration and filter material washing, which greatly reduces the construction cost of the sewage treatment project.

[0047] The above describes one embodiment of the present application in detail, but the above description is only a preferred embodiment of the present application and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made according to the scope of the present application should still belong to the scope of the present application.

Claims

1. A carbon-free denitrification device for wastewater treatment, comprising a sand filter (1), wherein a ladder platform (2) is fixedly installed at the top of the sand filter (1), characterized in that, The sand filter (1) includes a central sedimentation chamber (11), with filtration chambers (12) on both sides of the sedimentation chamber (11). An overflow weir (13) is provided on the side wall of each filtration chamber (12). The top of each filtration chamber (12) is connected to the overflow weir (13) via a water channel (14). A filter drain pipe (131) is connected to the bottom of the overflow weir (13). Conical concrete pouring layers (3) are evenly spaced at the bottom of each filtration chamber (12). A filter media layer (4) is also filled inside each filtration chamber (12). Water inlet pipes (5) are connected to both sides of the sedimentation chamber (11). The water inlet pipes (5) lead to the opposite side of the sedimentation chamber. Inside the corresponding filter chamber (12), an electric control valve (52) is installed on the water inlet pipe (5). Several continuous flushing filters (6) are evenly connected on both sides of the water inlet pipe (5) through water inlet branch pipes (51). Each continuous flushing filter (6) is arranged between two adjacent concrete pouring layers (3). A flushing drain pipe (8) is fixedly installed on both sides of the sand filter tank (1). The flushing drain pipe (8) is connected to each continuous flushing filter (6) through a drain branch pipe (81). A sewage pipe (112) is connected to the side wall of the sedimentation chamber (11). A cleaning component (7) is installed inside the sedimentation chamber (11).

2. The wastewater treatment carbon-source-free denitrification device according to claim 1, characterized in that, The continuous flushing filter (6) includes a diversion pipe (61), an air passage sleeve (62), and a riser pipe (63) arranged concentrically from the outside to the inside. The diversion pipe (61) is connected to the water inlet branch pipe (51). A water distributor (611) is fixedly installed at the bottom of the diversion pipe (61). A material distribution cone (621) is fixedly installed on the outer wall of the air passage sleeve (62). The material distribution cone (621) is located below the water distributor (611). A riser pump (622) is installed at the bottom of the air passage sleeve (62). Both ends of the riser pipe (63) pass through the air passage sleeve (62). A water collection cylinder (64) is installed on the outer side of the top of the riser pipe (63). The water collection cylinder (64) is connected to the drain branch pipe (81). A corrugated flushing pipe (65) is fixedly installed inside the water collection cylinder (64).

3. The wastewater treatment carbon-source-free denitrification device according to claim 2, characterized in that, The corrugated flushing pipe (65) is concentrically arranged on the outside of the top of the air passage sleeve (62). A baffle sleeve (651) is provided inside the water collection cylinder (64). The baffle sleeve (651) is fixedly installed at the top of the corrugated flushing pipe (65). An air pump (652) is fixedly installed inside the baffle cylinder. The air pump (652) is connected to the air passage sleeve (62) through an air pipe (653).

4. The wastewater treatment carbon-source-free denitrification device according to claim 3, characterized in that, The inner passage of the air passage sleeve (62) is connected to the lift pump (622). A water absorption filter (623) is provided at the connection between the lift pump (622) and the lift pipe (63). A pore (631) is provided through the pipe wall of the lift pipe (63) corresponding to the water absorption filter (623). The diameter of the pore (631) is smaller than the particle size of the filter material used in the filter layer (4).

5. A wastewater treatment carbon-source-free denitrification device according to claim 3, characterized in that, The top end of the riser pipe (63) extends into the baffle sleeve (651), the top end of the corrugated flushing pipe (65) is lower than the height of the water collection cylinder (64), and the highest point of the filter layer (4) is lower than the bottom end of the corrugated flushing pipe (65).

6. The wastewater treatment carbon-source-free denitrification device according to claim 1, characterized in that, The cleaning component (7) includes a drive cylinder (71), which is fixedly installed on the escalator platform (2). A sliding bracket (72) is provided between the bottom of the sedimentation chamber (11) and the escalator platform (2). A lifting block (73) is slidably installed inside the sliding bracket (72). The output end of the drive cylinder (71) is connected to the lifting block (73). The bottom of the lifting block (73) is connected to the sliding bracket (72) through a return spring (74). A frame (75) is fixedly connected to both ends of the lifting block (73). The frame (75) is adapted to the four walls of the inner cavity of the sedimentation chamber (11). The two sides of the lifting block (73) are rotatably connected to one end of the connecting rod (76). The other end of the connecting rod (76) is rotatably connected to the sliding seat (77). The sliding seat (77) is symmetrically arranged at both ends of the bottom of the sedimentation chamber (11).

7. A wastewater treatment carbon-source-free denitrification device according to claim 6, characterized in that, A first scraper (751) is provided on the outer wall of the frame (75), and the first scraper (751) is in contact with the side wall of the sedimentation chamber (11). A second scraper (772) is provided at the bottom of the sliding seat (77), and the second scraper (772) is in contact with the bottom of the sedimentation chamber (11).

8. A wastewater treatment carbon-source-free denitrification device according to claim 7, characterized in that, The sedimentation chamber (11) has sliding grooves (111) on both sides of its inner wall, and the sliding seat (77) is adapted to slide in the sliding grooves (111) at both ends.

9. A wastewater treatment carbon-source-free denitrification device according to claim 1, characterized in that, The filter media used in the filter media layer (4) is autotrophic denitrification filter media.

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