A baffled reactor for denitrification of sewage

Abstract

The invention discloses a sewage denitrification baffled reactor, belonging to the technical field of sewage treatment. A sewage denitrification baffled reactor is mainly composed of an inlet area, a baffled biological denitrification area, an outlet area, a sulfur powder adding device, a sulfur powder recovery device, and a clean water reflux device. When the invention is applied to the secondary biochemical effluent deep denitrification treatment of a sewage treatment plant, the water flow is in a turbulent state, which improves the mass transfer efficiency, enhances the activity of denitrifying thiobacillus, reduces the total nitrogen content in the sewage, and reduces environmental pollution.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to a sewage denitrification baffled reactor. Background Art

[0002] In recent years, the proportion of ammonia nitrogen in eutrophic waters has been decreasing, while the content of nitrate nitrogen has been increasing, and its proportion of inorganic nitrogen has been increasing overall.

[0003] The removal of N pollutants in sewage is mainly achieved through biological nitrification and denitrification. However, in general sewage treatment processes, since the drainage standards only require ammonia nitrogen to meet the standards, most water plants only convert ammonia nitrogen into nitrate nitrogen for discharge, resulting in high nitrate nitrogen content in sewage after secondary treatment, ultimately resulting in low ammonia nitrogen content but high TN content, so the harmless treatment effect is not achieved. Only through further denitrification treatment can the residual NO 3 - -N or NO 2 - -N produces harmless nitrogen gas (N 2 ), can finally achieve the harmless treatment of ammonia nitrogen.

[0004] At present, autotrophic denitrification in biological denitrification has the advantages of no need to add organic carbon source, less residual sludge, low operating cost, high efficiency, simple process, etc., and has attracted much attention from the engineering community. Sulfur autotrophic denitrification refers to the functional microorganisms using reduced sulfur as an electron donor to convert NO 3 - -N is reduced to nitrogen (N 2 ) process.

[0005] Among them, elemental sulfur (S 0 ) is cheap, non-toxic, has stable physical and chemical properties, and can also be used as a carrier for microbial growth, using low-valent sulfur as an electron donor and NO 3 - -N or NO 2 - -N acts as an electron acceptor for autotrophic denitrification. Therefore, in recent years, the use of elemental sulfur autotrophic denitrification technology to achieve deep denitrification of secondary effluent from urban sewage treatment plants has received extensive attention and research.

[0006] At present, the research and application of sulfur autotrophic denitrification to treat sewage are being carried out in various countries around the world, and the reactor devices used are also different. In recent years, anaerobic baffled reactors have been rapidly developed in the treatment of medium and high concentration sewage due to their advantages such as stable process, energy saving, and simple operation. However, for urban sewage after low-concentration secondary biological treatment, the application of anaerobic baffled reactors in secondary biological treatment of tail water is limited due to the low substrate concentration, reduced gas production, poor mass transfer between substrate and sludge, and insufficient microbial activity. Summary of the invention

[0007] The main technical problem solved by the present invention is to provide a sewage denitrification baffled reactor to improve the mass transfer efficiency between sewage and activated sludge, enhance the activity of sulfur autotrophic bacteria per unit volume, and reduce the total nitrogen content in sewage.

[0008] In order to achieve the above object, a technical solution adopted by the present invention is: a sewage denitrification baffled reactor, characterized in that it comprises:

[0009] An inlet area, which is used to receive and distribute tail water from the secondary biological treatment of the sewage treatment plant, and the inlet area is connected to the effluent of the secondary biological treatment facility of the sewage;

[0010] a baffled biological denitrification zone, which receives tail water distributed from the water inlet zone and processes the tail water into clean water using activated sludge;

[0011] An outlet water zone, which receives the clean water flowing out of the baffled biological denitrification zone;

[0012] A sulfur powder recovery device, which is used to recover the sulfur powder remaining in the denitrification reaction, is arranged on the liquid surface in the middle of the baffled biological denitrification zone and is connected to the water inlet zone;

[0013] A clean water return device, which diverts the clean water in the effluent area to the baffled biological denitrification area, thereby adjusting the suspended state of the activated sludge;

[0014] The water inlet area is connected to the baffled biological denitrification area through the first weir gate and / or the second weir gate, and the distribution flow of the tail water is adjusted by the opening size of the first weir gate and / or the second weir gate.

[0015] Preferably, the water inlet area includes:

[0016] An inlet pipe, which introduces the tail water of the secondary biological treatment into the inlet area, and the inlet of the inlet pipe is connected to the effluent of the secondary biological treatment facility of the sewage plant;

[0017] An inlet pool, used to receive tail water flowing out of the outlet of the inlet pipe;

[0018] A water distribution channel is used to distribute tail water in the water inlet pool, and the water distribution channel is connected to the water inlet pool through the first weir gate.

[0019] Preferably, the baffled biological denitrification zone is a water pool with an open top, and a partition arranged vertically in parallel from the bottom upward is arranged in the middle of the water pool to divide the water pool into a plurality of reaction chambers.

[0020] in,

[0021] The left side wall of the left end reaction chamber, the partition and the right side wall of the right end reaction chamber are all vertical overflow weirs, and the height of the overflow weir decreases from left to right, and

[0022] The left side wall is connected to the left end reaction chamber and the water distribution channel, and the middle reaction chamber is connected to the water distribution channel through the second weir gate.

[0023] Preferably, a baffle is provided on the left side wall of the left reaction chamber and the right side of the partition from the top of the reaction chamber downward, thereby dividing the reaction chamber into two areas: a downward flow pool and an upward flow pool. The baffle is parallel to the reaction chamber partition, and the lower part of the baffle is tilted and bent to the right.

[0024] Preferably, slopes are arranged at the two bottom feet of each reaction chamber, and the inclined surfaces of the slopes are respectively and hermetically connected to the side surface of the overflow weir, the bottom surface of the reaction chamber, the front surface of the reaction chamber and the rear surface of the reaction chamber.

[0025] Preferably, it also includes a sulfur powder adding device, which is used to add elemental sulfur powder to the tail water, and the sulfur powder adding device includes:

[0026] A sulfur powder dosing water ejector, which mixes the sulfur powder and clean water into slurry and provides conveying power for the slurry, wherein the water outlet of the sulfur powder dosing water ejector is connected to the sulfur powder dosing pipe, and the feed port of the sulfur powder dosing water ejector is used for dosing elemental sulfur powder;

[0027] The sulfur powder adding pipe adds the slurry to the water inlet of the baffled biological denitrification zone through another opening;

[0028] A sulfur powder adding water supply pipe provides the clean water for mixing the sulfur powder. One end of the sulfur powder adding water supply pipe is connected to the sulfur powder adding water ejector, and the other end is connected to a clean water source.

[0029] Preferably, the clean water source is the water outlet area.

[0030] Preferably, the sulfur powder recovery device comprises:

[0031] A skimming device, which is used to intercept the remaining sulfur powder in the denitrification reaction, and the skimming device is arranged on the liquid surface in the middle of the baffled biological denitrification zone;

[0032] A skimming pipe, which introduces the sulfur powder in the skimming device into the water inlet area, one end of the skimming pipe is connected to the skimming device, and the other end is connected to the water inlet area;

[0033] Wherein, when the solution in the denitrification reaction process flows through the skimming device, the sulfur powder floating on the surface of the solution is retained in the skimming device.

[0034] Preferably, the water outlet area comprises:

[0035] An outlet channel, which is used to receive the clean water, and the outlet channel is connected to the baffled biological denitrification zone;

[0036] An outlet pipe is used to discharge the clean water in the outlet channel. The outlet pipe is installed at the bottom of the outlet channel. One end of the outlet pipe is connected to the outlet channel, and the other end is connected to the external flocculation tank of the sewage denitrification baffled reactor.

[0037] Preferably, the clean water reflux device comprises:

[0038] A reflux pump, which provides reflux power for the clean water, and the reflux pump is located at the bottom of the water outlet area;

[0039] A reflux pipe is used to guide the clean water to the baffled biological denitrification zone. One end of the reflux pipe is connected to the reflux pump. The reflux pipe is provided with a plurality of branch pipes. A flap gate is installed on each branch pipe. The flap gate opens below the liquid level at the water inlet of the baffled biological denitrification zone.

[0040] Preferably, there are a plurality of baffled biological denitrification zones, and the water distribution channel is arranged between any two adjacent baffled biological denitrification zones.

[0041] The beneficial effects of the present invention are: through a sewage denitrification baffled reactor, the mass transfer efficiency between sewage and activated sludge is improved, the activity of sulfur autotrophic bacteria per unit volume is enhanced, the total nitrogen content in sewage is reduced, and environmental pollution is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a top view of a schematic diagram of the structure of a sewage denitrification baffled reactor of the present invention;

[0043] The components in the accompanying drawings are marked as follows: 101 - water inlet tank, 102 - water inlet pipe, 103 - walkway plate, 104 - water distribution channel, 105 - sulfur powder adding pipe, 106 - first reaction chamber, 107 - second reaction chamber, 108 - third reaction chamber, 109 - outlet channel.

[0044] Figure 2 This is a top view of the following structural schematic diagram of a sewage denitrification baffled reactor walkway plate of the present invention:

[0045] The components in the attached drawings are marked as follows: 201-first weir gate, 202-flap gate, 203-second weir gate, 204-reflux pipe, 205-flow meter, 206-reflux pump, 207-sulfur powder water distribution pump, 208-sulfur powder water supply pipe, 209-water outlet pipe, 210-slag skimming equipment.

[0046] Figure 3 This is a front view of a schematic diagram of the structure of a sewage denitrification baffled reactor of the present invention:

[0047] The components in the accompanying drawings are marked as follows: 301 - first overflow weir, 302 - second overflow weir, 303 - third overflow weir, 304 - fourth overflow weir, 305 - first baffle, 306 - second baffle, 307 - third baffle.

[0048] Figure 4 This is a schematic diagram of the cross-sectional structure of a sewage denitrification baffled reactor along the center line of the water inlet tank of the present invention:

[0049] Figure 5 This is a central cross-sectional view of the slag skimming equipment of the present invention.

[0050] The components in the accompanying drawings are marked as follows: 401 - skimming pipe. DETAILED DESCRIPTION

[0051] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0052] It should be noted that the terms "first", "second", "third", etc. in the claims and description of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0053] Figure 1 The structure of a sewage denitrification baffled reactor of the present invention is shown, and the sewage denitrification baffled reactor mainly includes: an inlet pool 101, an inlet pipe 102, a walkway plate 103, a water distribution channel 104, a sulfur powder addition pipe 105, a first reaction chamber 106, a second reaction chamber 107, a third reaction chamber 108, and an outlet channel 109.

[0054] The water inlet tank 101, the water inlet pipe 102 and the water distribution channel 104 constitute the water inlet area of ​​the present invention. One end of the water inlet pipe 102 is connected to the effluent of the secondary biological treatment facility of the sewage treatment plant, and the other end is open to the water inlet tank 101. The water inlet pipe 102 introduces the tail water (the target of the treatment of the present invention) in the secondary biological treatment facility into the water inlet tank 101. The water inlet tank 101 is connected to the water distribution channel 104 through the first weir gate 201, and the water volume in the water inlet distribution channel is controlled by adjusting the opening of the first weir gate 201. The water distribution channel 104 includes three branch channels, which correspond to the three sides of the water inlet tank 101 and the three first weir gates 201 respectively. The walkway plate 103 is used to observe the operation of the entire baffled reactor. The walkway plate 103 can be used to reach various parts of the baffled reactor to adjust and repair the equipment.

[0055] Depend on Figure 1 It can be seen that the present embodiment includes two symmetrically distributed baffled biological denitrification zones, which are located on both sides of a branch of the water distribution channel 104. Each baffled biological denitrification zone is a pool with an open top. A vertically parallel partition (overflow weir) is set from the bottom to the top in the middle of the pool, dividing the baffled biological denitrification zone into three reaction chambers, namely the first reaction chamber 106, the second reaction chamber 107 and the third reaction chamber 108. The right side of the third reaction chamber 108 is connected to the outlet channel 109, which is used to discharge the clean water treated by the baffled biological denitrification zone.

[0056] The number of reaction chambers can be adjusted according to the actual need to treat the tail water effluent from the secondary biological treatment facility, and can be set to two, three, four, five, etc. The number of baffled biological denitrification zones and the number of branches of the water distribution channel 104 can also be adjusted according to the actual need to treat sewage.

[0057] Figure 2 The structure of a sewage denitrification baffle reactor of the present invention is shown below the walkway plate 103. In the figure, the first weir gate 201, the flap gate 202, the second weir gate 203, the return pipe 204, the flow meter 205, the return pump 206, the sulfur powder water distribution pump 207, the sulfur powder water supply pipe 208, and the water outlet pipe 209 can be seen.

[0058] The first weir gate 201 is used to connect the three branches of the water inlet pool 101 and the water distribution channel 104. One branch of the water distribution channel 104 is connected to the second reaction chamber 107 and the third reaction chamber 108 respectively through the second weir gate 203, so that the amount of tail water entering the second reaction chamber 107 and the amount of tail water entering the third reaction chamber 108 are adjusted by the size of the opening of the second weir gate 203. The tail water distributed by the second weir gate 203 adjusts the nitrate nitrogen content in the second reaction chamber 107 and the third reaction chamber 108 to meet the needs of the activity of sulfur autotrophic bacteria. The flap gate 202, the reflux pipe 204, the flow meter 205 and the reflux pump 206 constitute the clean water reflux device of the present invention. The reflux pump 206 is arranged at the bottom of the outlet channel 109, which provides reflux power for the clean water in the outlet channel 109. The reflux pump 206 is connected to one end of the reflux pipe 204, and the flow meter 205 is installed on the reflux pipe 204 to observe the flow of the reflux clean water. A plurality of branch pipes are arranged on the reflux pipe 204, and a flap gate 202 is installed at the end of each branch pipe, and the flap gate 202 opens below the liquid level of the water inlet of the first reaction chamber 106 and the second reaction chamber 107 in the baffled biological denitrification zone. The clean water reflux can increase the rising velocity of the water in the reaction zone, and the sludge is driven to rise by the rapid rise of the water inlet and reflux, so that the sludge is suspended, and the sulfur powder and sewage are fully in contact with the sludge, so that the reaction is more complete, and the denitrification continues at the same time.

[0059] The sulfur powder water distribution pump 207, the sulfur powder water supply pipe 208, the sulfur powder dosing pipe 105 and the sulfur powder dosing water ejector constitute the sulfur powder dosing device of the present invention. The sulfur powder water distribution pump 207 is arranged at the bottom of the outlet channel 109, and the sulfur powder water distribution pump 207 is connected to the sulfur powder water supply pipe 208, and the other end of the sulfur powder water supply pipe 208 is connected to the water inlet of the sulfur powder dosing water ejector. The feed inlet of the sulfur powder dosing water ejector is used to add elemental sulfur powder, and the water outlet of the sulfur powder dosing water ejector is connected to the sulfur powder dosing pipe 105. The other end of the sulfur powder dosing pipe 105 opens at the water inlet of the left end reaction chamber (the first reaction chamber 106) in the baffled biological denitrification zone (see Figure 1 ).

[0060] The sulfur powder dosing water injector mixes the sulfur powder and clean water required for the denitrification reaction uniformly, and adds the sulfur powder and clean water mixture to the water inlet of the left end reaction chamber (the first reaction chamber 106) in the baffled biological denitrification zone through the sulfur powder dosing pipe 105. The water inlet of the sulfur powder dosing water injector can also be connected to other clean water sources (such as tap water).

[0061] The skimming device 210 and the skimming pipe 401 (see Figure 5) constitutes the sulfur powder recovery device of the present invention. The skimming device 210 is arranged on the liquid surface in the middle of the baffled biological denitrification zone (such as the liquid surface before the first reaction chamber 106, the second reaction chamber 107, the third reaction chamber 108 and the outlet channel 109 are separated from each other), and the sulfur powder in the sulfur powder adding pipe 105 enters the first reaction chamber 106 with the water flow, and is continuously consumed as the biological denitrification reaction proceeds. The sulfur powder that does not participate in the denitrification reaction is intercepted by the skimming device 210 on the liquid surface at the junction of the three reaction chambers. Together with part of the reaction solution, it flows into the skimming pipe 401, and the skimming pipe 401 is connected to the water inlet pool 101, so that the recovered sulfur powder re-enters the biological denitrification zone, thereby improving the utilization rate of sulfur powder. The number of sulfur powder recovery devices can be adjusted according to actual needs, such as setting a set of sulfur powder recovery devices every other reaction chamber.

[0062] The outlet channel 109 and the outlet pipe 209 constitute the outlet area of ​​the present invention. The outlet channel 109 is connected to the baffled biological denitrification zone and is used to receive the clean water flowing out of the baffled biological denitrification zone. The outlet pipe 209 is installed at the bottom of the outlet channel 109 and is used to discharge the clean water in the outlet channel 109. One end of the outlet pipe 209 is connected to the outlet channel 109, and the other end is connected to the external flocculation tank of the sewage denitrification baffled reactor.

[0063] Figure 3 The structure of a baffled reactor for denitrification of sewage of the present invention is shown. The structure of the baffled biological denitrification zone of the present invention is described from the vertical direction. The baffled biological denitrification zone is a water pool with an open top, and a partition arranged in parallel in the vertical direction (i.e., the second overflow weir 302 and the third overflow weir 303) is set in the middle of the water pool. Among them, the first overflow weir 301, the second overflow weir 302, the third overflow weir 303 and the fourth overflow weir 304 divide the baffled biological denitrification zone into a first reaction chamber 106, a second reaction chamber 107 and a third reaction chamber 108. The left end reaction chamber (the first reaction chamber 106) is connected to the water distribution channel 104 through the first overflow weir 301, and the right end reaction chamber (the third reaction chamber 108) is connected to the outlet channel 109 through the fourth overflow weir 304. The middle reaction chamber (the second reaction chamber 107) is connected to the water distribution channel 104 through the second weir gate 203. The heights of the four overflow weirs decrease from left to right.

[0064] In each reaction chamber, a baffle plate is arranged from the top of the reaction chamber downward, and the lower part is tilted and bent to the right, namely, the first baffle plate 305, the second baffle plate 306, and the third baffle plate 307. The first baffle plate 305 is located on the right side of the first overflow weir 301, thereby dividing the first reaction chamber 106 into two areas, a downward flow pool and an upward flow pool; the second baffle plate 306 is located on the right side of the second overflow weir 302, thereby dividing the second reaction chamber 107 into two areas, a downward flow pool and an upward flow pool; the third baffle plate 307 is located on the right side of the third overflow weir 303, thereby dividing the third reaction chamber 108 into two areas, a downward flow pool and an upward flow pool.

[0065] Under the joint action of four overflow weirs and three baffles, the tail water in the water distribution channel 104 flows through the downward flow pool of the first reaction chamber 106, the upward flow pool of the first reaction chamber 106, the downward flow pool of the second reaction chamber 107, the upward flow pool of the second reaction chamber 107, the downward flow pool of the third reaction chamber 108, the upward flow pool of the third reaction chamber 108, and the outlet channel 109 in sequence. In this process, the tail water is treated into clean water by the activated sludge in the reaction chamber. The nitrate nitrogen in the tail water is removed by contact with the sulfur autotrophic bacteria. The gas generated in the reactor during the tail water treatment process causes the microbial solids in the reactor to expand and precipitate up and down in each compartment formed by the baffles, while the water flow in the entire reactor flows horizontally at a slower speed, and the hydraulic flow state is close to the plug flow type. The water flow flows around the baffles, which increases the total length of the water flow in the reactor. In addition, due to the blocking of the baffles and the sedimentation of the sludge, the biological solids are effectively retained in the reactor.

[0066] The flap gate 202 opens below the liquid level at the water inlet of the first reaction chamber 106 and the second reaction chamber 107 in the baffled biological denitrification zone, and there are two flap gates 202 in each reaction chamber. The number of flap gates 202 can also be adjusted according to the specific needs of sewage treatment, so as to better adjust the flow rate and flow of the inlet water, fully mix the activated sludge and water, improve the mass transfer efficiency between the sludge and water, and provide suitable environmental conditions for the microorganisms in the sludge.

[0067] Two bottom feet of each of the three reaction chambers are provided with slopes, and the inclined surfaces of the slopes are respectively connected with the side of the overflow weir, the bottom surface of the reaction chamber, the front of the reaction chamber and the back of the reaction chamber.

[0068] Figure 4 The figure shows the cross-sectional structure of a sewage denitrification baffled reactor along the center line of the water inlet tank of the present invention. The second weir gate 203 in the water distribution channel 104 is arranged at the water inlet of the second reaction chamber 107 and the third reaction chamber 108 .

[0069] The present invention takes the first-phase effluent of a sewage treatment plant as the treatment object, and the data during operation show that:

[0070] When the temperature is above 23℃, the volume load reaches 0.8 kgN / (m 3 •d), treating wastewater NO 3 - -N concentration is about 20 mg / L, hydraulic retention time is 0.6 h, TN removal rate is as high as 90%, and the maximum rising velocity is 4 m / h, which can still ensure that the sludge is evenly suspended in the reaction zone and does not flow away with the effluent. When the water temperature is between 10 and 20 °C, the volume is maintained at 0.48 kgN / (m 3 •d), the effluent TN is stably lower than 10 mg / L.

[0071] The application of the present invention improves the mass transfer efficiency between sewage and activated sludge, enhances the activity of sulfur autotrophic bacteria per unit volume, reduces the total nitrogen content in sewage, and reduces environmental pollution.

[0072] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A sewage denitrification baffled reactor, characterized in that include: An inlet area, which is used to receive and distribute tail water from the secondary biological treatment of the sewage treatment plant, and the inlet area is connected to the effluent of the secondary biological treatment facility of the sewage; The water inlet area includes: An inlet pipe, which introduces the tail water of the secondary biological treatment into the inlet area, and the inlet of the inlet pipe is connected to the effluent of the secondary biological treatment facility of the sewage plant; An inlet pool, used to receive tail water flowing out of the outlet of the inlet pipe; A water distribution channel, used for distributing tail water in the water inlet pool, the water distribution channel being connected to the water inlet pool through a first weir gate; The baffled biological denitrification zone receives the tail water distributed by the water inlet zone and processes the tail water into clean water by using activated sludge; the baffled biological denitrification zone is a water pool with an open top, and a partition arranged vertically in parallel from the bottom to the middle of the water pool is arranged to divide the water pool into a plurality of reaction chambers, wherein the left side wall of the left end reaction chamber, the partition and the right side wall of the right end reaction chamber are all vertical overflow weirs, and the height of the overflow weir decreases from left to right, the left side wall connects the left end reaction chamber and the water distribution channel, and the middle The intermediate reaction chamber is connected to the water distribution channel through the second weir gate; the left side wall of the left end reaction chamber and the right side of the partition are both provided with baffles from the top of the reaction chamber downward, so as to divide the reaction chamber into two areas, a downward flow pool and an upward flow pool, the baffle is parallel to the reaction chamber partition, and the lower part of the baffle is tilted and bent to the right; slopes are provided at the two bottom feet of each reaction chamber, and the inclined surfaces of the slopes are respectively closed and connected with the side of the overflow weir, the bottom surface of the reaction chamber, the front of the reaction chamber and the back of the reaction chamber; An outlet water zone, which receives the clean water flowing out of the baffled biological denitrification zone; A sulfur powder recovery device, which is used to recover the sulfur powder remaining in the denitrification reaction, is arranged on the liquid surface in the middle of the baffled biological denitrification zone and is connected to the water inlet zone; A clean water return device, which diverts the clean water in the effluent area to the baffled biological denitrification area, thereby adjusting the suspended state of the activated sludge; Wherein, the water inlet area is connected to the baffled biological denitrification area through the first weir gate and / or the second weir gate, and the distribution flow of the tail water is adjusted by the opening size of the first weir gate and / or the second weir gate; It also includes a sulfur powder adding device, which is used to add elemental sulfur powder to the tail water, and the sulfur powder adding device includes: A sulfur powder dosing water ejector, which mixes the sulfur powder and clean water into slurry and provides conveying power for the slurry, wherein the water outlet of the sulfur powder dosing water ejector is connected to the sulfur powder dosing pipe, and the feed port of the sulfur powder dosing water ejector is used for dosing elemental sulfur powder; The sulfur powder adding pipe adds the slurry to the water inlet of the baffled biological denitrification zone through another opening; A sulfur powder adding water supply pipe, which provides the clean water for mixing the sulfur powder, one end of the sulfur powder adding water supply pipe is connected to the sulfur powder adding water ejector, and the other end is connected to a clean water source; The sulfur powder recovery device comprises: A skimming device, which is used to intercept the remaining sulfur powder in the denitrification reaction, and the skimming device is arranged on the liquid surface in the middle of the baffled biological denitrification zone; A skimming pipe, which introduces the sulfur powder in the skimming device into the water inlet area, one end of the skimming pipe is connected to the skimming device, and the other end is connected to the water inlet area; Wherein, when the solution in the denitrification reaction process flows through the skimming device, the sulfur powder floating on the surface of the solution is retained in the skimming device; The clean water reflux device comprises: A reflux pump, which provides reflux power for the clean water, and the reflux pump is located at the bottom of the water outlet area; A reflux pipe is used to guide the clean water to the baffled biological denitrification zone. One end of the reflux pipe is connected to the reflux pump. The reflux pipe is provided with a plurality of branch pipes. A flap gate is installed on each branch pipe. The flap gate opens below the liquid level at the water inlet of the baffled biological denitrification zone.

2. The wastewater denitrification baffled reactor according to claim 1, characterized in that The clean water source is the water outlet area.

3. The sewage denitrification baffled reactor according to claim 1, characterized in that The water outlet area comprises: An outlet channel, which is used to receive the clean water, and the outlet channel is connected to the baffled biological denitrification zone; An outlet pipe is used to discharge the clean water in the outlet channel. The outlet pipe is installed at the bottom of the outlet channel. One end of the outlet pipe is connected to the outlet channel, and the other end is connected to the external flocculation tank of the sewage denitrification baffled reactor.

4. The wastewater denitrification baffled reactor according to any one of claims 1 to 3, characterized in that There are multiple baffled biological denitrification zones, and the water distribution channel is arranged between any two adjacent baffled biological denitrification zones.

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