Sulfur autotrophic-heterotrophic synergistic denitrification nitrogen removal device and method

Abstract

The invention relates to the technical field of sewage treatment, in particular to a sulfur autotrophy-heterotrophy synergistic denitrification nitrogen removal device and a sulfur autotrophy-heterotrophy synergistic denitrification nitrogen removal method. According to the invention, the sulfur autotrophic denitrification technology and the sulfur heterotrophic denitrification technology are combined, so that the overall sewage denitrification treatment efficiency is improved. In the whole reaction process, the material distribution holes formed in the bottom of the material distribution pipe towards the reaction area are driven by the rotary walking device to uniformly enter the reaction area, so that excessive raw materials are prevented from being used, the cost is reduced, the water head loss is also reduced, blockage is avoided, no hydraulic dead zone exists, and backwashing is not needed. Meanwhile, the scraping and stirring device is driven by the rotary walking device to stir the whole reaction area, so that a dead area is prevented from being formed, and the reaction is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly to a sulfur autotrophic-heterotrophic synergistic denitrification device and method. Background Art

[0002] Disclosing the information of this background art section is only intended to enhance the overall understanding of the present invention, and it is not necessarily regarded as an admission or an implication in any form that this information constitutes the prior art already known to those of ordinary skill in the art.

[0003] With the rapid development of industry, high-concentration nitrogen-containing wastewater is discharged into water bodies, seriously endangering human health and the ecological environment, mainly manifested in the following three aspects: (1) The accumulation of nitrogen compounds can lead to severe eutrophication of water bodies, the crazy growth of algae, resulting in oxygen deficiency in the water bodies, and thus the death of organisms such as fish and shellfish in the water bodies. A large number of dead organisms release more ammonia and organic nitrogen compounds due to decay, causing a vicious cycle, resulting in the water body emitting an odor and the water quality deteriorating further; (2) The oxidation of ammonia and nitrite consumes a large amount of dissolved oxygen, making the water body oxygen-deficient; (3) Nitrate in the human body can be reduced to nitrite under the action of microorganisms. Nitrite combines with hemoglobin to form methemoglobin, affecting the oxygen-carrying function of hemoglobin and leading to human hypoxia and death; on the other hand, nitrite can form nitrosamines or nitrosamides with amines, causing carcinogenic effects on the human body. Gases such as NO and NO2 are seriously harmful to the human body. Under the strong ultraviolet irradiation of the sun, they undergo photochemical reactions to produce secondary pollutants, forming photochemical smog, resulting in a decline in the atmospheric environmental quality. The treatment of water body nitrogen pollution is extremely urgent.

[0004] Biological denitrification is widely used in advanced denitrification due to its high efficiency and low cost. At present, biological denitrification technology is divided into heterotrophic denitrification and autotrophic denitrification. However, both heterotrophic denitrification and autotrophic denitrification will add materials, and in the later filtration process, there will be problems such as large head loss during filtration, easy blockage, and the generation of hydraulic dead zones; at the same time, the added materials cannot be recycled, and the treatment cost is too high; furthermore, the efficiency of a single biological denitrification technology is relatively low, restricting its wide application. Summary of the Invention

[0005] In order to overcome the above problems, the present invention provides a sulfur autotrophic-heterotrophic synergistic denitrification device and method.

[0006] To achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] In the first aspect of the present invention, a sulfur autotrophic-heterotrophic synergistic denitrification device is provided, which includes a reactor body. The reactor body includes an inner cylinder and an outer cylinder. A reaction zone is formed between the inner wall of the outer cylinder and the outer wall of the inner cylinder. Cage-shaped suspended fillers are placed in the reaction zone. A vertical bar grille is provided at the bottom of the side wall of the inner cylinder, and the inner cylinder is a solid-liquid separation zone. The bottom plate of the inner cylinder is connected to a material recovery device. The top of the inner cylinder is connected to a rotating walking device. The rotating walking device includes a cloth pipe and a rotating beam bridge. The cloth pipe is connected to the rotating beam bridge. The rotating beam bridge is connected to a scraping and stirring device. A walking wheel is provided at the end of the rotating beam bridge, and the walking wheel can perform circular motion around the axis of the inner cylinder.

[0008] In the second aspect of the present invention, a sulfur autotrophic-heterotrophic synergistic denitrification method is provided, which includes the following steps:

[0009] Sewage and composite sulfur-carbon source powder are evenly added to the reaction zone where cage-shaped suspended fillers are placed. Sulfur autotrophic denitrifying bacteria and sulfur heterotrophic synergistic denitrifying bacteria adsorb on the surface of the cage-shaped suspended fillers to perform denitrification.

[0010] After the denitrified mixed liquid undergoes solid-liquid separation, treated liquid and treated solid are obtained respectively. The treated liquid is discharged after passing the detection. The treated solid is separated to form sludge light material and heavy material composite sulfur-carbon source powder. The sludge light material is discharged, and the heavy material composite sulfur-carbon source powder is recycled.

[0011] The beneficial effects of the present invention are as follows:

[0012] (1) The present invention relates to the technical field of sewage treatment, and specifically relates to a sulfur autotrophic-heterotrophic synergistic denitrification device and method. In the present invention, by combining sulfur autotrophic denitrification technology and sulfur heterotrophic denitrification technology, the overall efficiency of sewage denitrification treatment is improved. Sulfur autotrophic denitrifying bacteria and sulfur heterotrophic synergistic denitrifying bacteria adsorb on the surface of the cage-shaped suspended fillers to form a biofilm. The sulfur autotrophic denitrifying bacteria in the biofilm use elemental sulfur or sulfur compounds as electron donors and nitrate nitrogen in the sewage as electron acceptors to reduce nitrate nitrogen to nitrogen gas. The heterotrophic denitrifying bacteria in the biofilm use organic matter as an electron donor and nitrate nitrogen in the sewage as an electron acceptor to reduce nitrate nitrogen to nitrogen gas. Nitrogen gas is removed from the sewage in the form of bubbles, and the sewage is purified.

[0013] (2) During the entire reaction process, the cloth holes opened at the bottom of the cloth pipe towards the reaction zone evenly enter the reaction zone under the drive of the rotating walking device, avoiding the use of excessive raw materials, reducing costs, and at the same time reducing the head loss, not clogging, having no hydraulic dead zone, and not requiring backwashing. At the same time, the scraping and stirring device stirs the entire reaction zone under the drive of the rotating walking device, avoiding the formation of dead zones and promoting the reaction.

[0014] (3) After denitrification is completed, the spherical cage-shaped suspended packing is intercepted in the reaction zone by the vertical bar grille. The purified sewage flows through the vertical bar grille and into the solid-liquid sedimentation separation zone, flowing upward. The sewage flowing into the solid-liquid sedimentation separation zone carries the composite sulfur-carbon source powder not adsorbed by the biofilm and the sludge shed from the biofilm. After enhanced sedimentation separation by the inclined plate packing, treated liquid and treated solid are separated. The treated liquid is guided by the triangular overflow weir into the overflow trough, and the water is discharged into the outlet pipe through the overflow trough. The treated solid, under the action of the reflux pump, enters the hydrocyclone through the reflux pipe. The hydrocyclone separates to form light sludge and heavy composite sulfur-carbon source powder. If the sludge content is small, the light sludge and the heavy composite sulfur-carbon source powder are all merged into the inlet pipe for recycling; if the sludge content is large, the second control valve is opened, the heavy sulfur-carbon source powder is recovered, and the light sludge is discharged to the sludge treatment system through the sludge discharge pipe. Using the spherical cage-shaped suspended packing in the present invention can reduce the input of raw materials, and at the same time recycle the composite sulfur-carbon source powder, further reducing the cost of denitrification.

[0015] (4) The sulfur autotrophic-heterotrophic synergistic denitrification and nitrogen removal device provided by the present invention has a fast start-up speed, less surplus sludge production, no secondary pollution, and a total nitrogen removal rate of over 96%, with stable effects. Description of the Drawings

[0016] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0017] Figure 1 It is a structural schematic diagram of a sulfur autotrophic-heterotrophic synergistic denitrification and nitrogen removal device, wherein, 1 - reactor body, 2 - rotating walking device, 3 - cloth pipe, 4 - annular aggregate trough, 5 - scraping and stirring device, 6 - material recovery device, 7 - feeder support, 8 - composite sulfur-carbon source dosing device, 9 - inlet pipe, 101 - outer cylinder, 102 - inner cylinder, 103 - vertical bar grille, 104 - reaction zone, 105 - solid-liquid sedimentation separation zone, 106 - walkway board, 107 - spherical cage-shaped suspended packing, 108 - inclined plate packing, 109 - overflow weir, 110 - overflow trough, 111 - outlet pipe, 201 - thrust bearing, 202 - rotating beam bridge, 203 - walking wheel, 204 - drive motor, 205 - drive chain, 206 - support, 301 - cloth hole, 501 - scraping and stirring vertical rod, 502 - second stirring plate, 503 - first stirring plate, 601 - reflux pump, 602 - reflux pipe, 603 - hydrocyclone, 604 - first control valve, 605 - second control valve, 606 - sludge discharge pipe;

[0018] Figure 2 It is a structural schematic diagram of a regular tetrahedron fabric packing, where 1071 is the regular tetrahedron fabric packing; 1072 is the sewing thread. Specific Embodiments

[0019] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0020] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] In a first typical embodiment of the present invention, a sulfur autotrophic-heterotrophic synergistic denitrification and nitrogen removal device is provided, which includes a reactor body. The reactor body includes an inner cylinder and an outer cylinder. A reaction zone is formed between the inner wall of the outer cylinder and the outer wall of the inner cylinder, and a spherical cage-shaped suspended packing is placed in the reaction zone; a vertical bar grille is provided at the bottom of the side wall of the inner cylinder, and the inner cylinder is a solid-liquid separation zone; the bottom plate of the inner cylinder is connected to a material recovery device; the top of the inner cylinder is connected to a rotating walking device, and the rotating walking device includes a cloth pipe and a rotating beam bridge. The cloth pipe is connected to the rotating beam bridge, the rotating beam bridge is connected to a scraping and stirring device, and a walking wheel is provided at the end of the rotating beam bridge, and the walking wheel can perform a circular motion around the axis of the inner cylinder.

[0022] In one or more embodiments, the outer cylinder includes an outer cylinder bottom plate, and the included angle between the outer cylinder bottom plate and the horizontal plane is 5-15°.

[0023] In one or more embodiments, the included angle between the bottom plate of the inner cylinder and the horizontal plane is 45-60°.

[0024] In one or more embodiments, the inside of the spherical cage-shaped suspended packing is filled with a regular tetrahedron fabric packing, and the inside of the regular tetrahedron fabric packing is filled with a slow-release carbon source powder.

[0025] Preferably, the raw materials of the slow-release carbon source powder include, by weight: 50-100 parts of coconut shell powder, 50-100 parts of pine bark powder, and 20-50 parts of corn cob powder; the particle size of each powder is 1-20 mesh.

[0026] In one or more embodiments, an overflow groove is provided on the inner wall of the inner cylinder and extends around it. A plurality of triangular overflow weirs are distributed around the upper side of the inner wall of the overflow groove; the overflow groove is connected to the water outlet pipe.

[0027] In one or more embodiments, a connecting bracket is provided on the inner wall of the inner cylinder. The top of the bracket is connected to a thrust bearing for realizing lateral rotation, and the top of the thrust bearing is connected to a rotating beam bridge.

[0028] Preferably, the axis of the thrust bearing is on the axis of the inner cylinder.

[0029] In one or more embodiments, the top of the rotating beam bridge is fixedly connected to an annular aggregate trough, and the annular aggregate trough is fixedly connected to a distributing pipe.

[0030] Preferably, the annular aggregate trough is connected to a water inlet pipe.

[0031] Preferably, a composite sulfur-carbon source dosing device is provided above the annular aggregate trough. The composite sulfur-carbon source dosing device is connected to a dosing machine support, and the dosing machine support is fixedly connected to the rotating beam bridge.

[0032] Preferably, the bottom of the distributing pipe is provided with distribution holes facing the reaction zone.

[0033] Further preferably, the distribution of the distribution holes becomes gradually denser in the direction away from the axis of the inner cylinder; the circular area enclosed by the centers of every two adjacent distribution holes rotating around the axis of the thrust bearing for one week is equal.

[0034] Preferably, the composite sulfur-carbon source dosing device can dose the composite sulfur-carbon source powder into the annular aggregate trough.

[0035] Further preferably, the raw materials of the composite sulfur-carbon source powder include, by weight: 50-100 parts of sulfur powder, 20-40 parts of pyrite, 20-40 parts of calcium carbonate stone powder, and 25-50 parts of coconut shell powder. The particle size of each powder is 50-200 mesh.

[0036] In one or more embodiments, inclined plate fillers are connected to the inner wall of the inner cylinder.

[0037] In one or more embodiments, a walkway plate is fixedly connected to the top of the outer cylinder side wall in the direction away from the reaction zone, and the walking wheels are in rolling connection with the walkway plate.

[0038] In one or more embodiments, the rotating walking device further includes a driving machine and a transmission chain. The driving machine is connected to the walking wheels through the transmission chain to drive the walking wheels to walk on the walkway plate, and further drive the walking wheels to rotate around the axis of the thrust bearing, that is, the walking wheels can perform circular motion centered on the axis of the inner cylinder.

[0039] In one or more embodiments, the scraping and stirring device includes a scraping and stirring vertical rod, a first stirring plate and a second stirring plate. The scraping and stirring vertical rod is fixedly connected to the rotating beam bridge. The middle of the scraping and stirring vertical rod is fixedly connected to the first stirring plate, and the bottom of the scraping and stirring vertical rod is fixedly connected to the second stirring plate. The second stirring plate is close to the bottom plate of the outer cylinder.

[0040] In one or more embodiments, the material recovery device includes a reflux pump, and the reflux pump is respectively connected to the cyclone separator and the bottom plate of the inner cylinder.

[0041] Preferably, the cyclone separator includes an upper cylindrical separation zone and a lower inverted conical separation zone, and the upper cylindrical separation zone and the lower inverted conical separation zone are connected and communicated.

[0042] Further preferably, the upper cylindrical separation zone is provided with a feed inlet, and the top of the upper cylindrical separation zone is provided with a light material discharge port; the bottom of the lower inverted conical separation zone is provided with a heavy material discharge port;

[0043] Even more preferably, the heavy material discharge port is provided with a first control valve, and the first control valve is connected to the water inlet pipe;

[0044] The light material discharge port is provided with a second control valve, and the second control valve is connected to the sludge discharge pipe.

[0045] A second typical embodiment of the present invention provides a sulfur autotrophic-heterotrophic synergistic denitrification method, including the following steps:

[0046] Uniformly add sewage and composite sulfur-carbon source powder to the reaction zone where spherical cage-shaped suspended fillers are placed, and sulfur autotrophic denitrifying bacteria and sulfur heterotrophic synergistic denitrifying bacteria adsorb on the surface of the spherical cage-shaped suspended fillers to carry out denitrification;

[0047] After the denitrified mixed liquid is subjected to solid-liquid separation, treated liquid and treated solid are respectively obtained; after the treated liquid is detected to be qualified, it is discharged; after the treated solid is separated, sludge light material and heavy material composite sulfur-carbon source powder are formed, the sludge light material is discharged, and the heavy material composite sulfur-carbon source powder is recycled and reused.

[0048] In order to enable those skilled in the art to more clearly understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with specific embodiments.

[0049] Example 1

[0050] Reference Figure 1, A sulfur autotrophic-heterotrophic synergistic denitrification and nitrogen removal device, including a reactor body 1. The reactor body 1 includes an inner cylinder 102 and an outer cylinder 101. A reaction zone 104 is formed between the inner wall of the outer cylinder 101 and the outer wall of the inner cylinder 102. A spherical cage-shaped suspended filler 107 is placed in the reaction zone 104; a vertical bar grille 103 is provided at the bottom of the side wall of the inner cylinder 102, and the inner cylinder 102 is a solid-liquid separation zone 105; the bottom plate of the inner cylinder 102 is connected to the material recovery device 6; the top of the inner cylinder 102 is connected to a rotating walking device 2. The rotating walking device 2 includes a cloth feeding pipe 3 and a rotating beam bridge 202. The cloth feeding pipe 3 is connected to the rotating beam bridge 202. The rotating beam bridge 202 is connected to a scraping and stirring device 5. A walking wheel 203 is provided at the end of the rotating beam bridge 202, and the walking wheel 203 can perform circular motion around the axis of the inner cylinder 102.

[0051] Among them, the outer cylinder 101 includes an outer cylinder bottom plate, and the included angle between the outer cylinder bottom plate and the horizontal plane is 5-15°. The setting of the included angle between the outer cylinder bottom plate and the horizontal plane can enable the denitrified mixed liquid to enter the solid-liquid separation zone 105 of the inner cylinder 102 through the vertical bar grille 103.

[0052] The included angle between the bottom plate of the inner cylinder 102 and the horizontal plane is 45-60°. The setting of the included angle between the bottom plate and the horizontal plane can enable the processed solids obtained by the separation in the solid-liquid separation zone 105 to be concentrated and precipitated and smoothly enter the material recovery device 6.

[0053] Reference Figure 2 , The inside of the spherical cage-shaped suspended filler 107 is filled with a regular tetrahedron fabric filler 1071. The regular tetrahedron fabric filler 1071 is sealed by 1072 sewing threads, and its inside is filled with a slow-release carbon source powder. Sulfur autotrophic denitrifying bacteria and sulfur heterotrophic synergistic denitrifying bacteria are adsorbed on the surface of the regular tetrahedron fabric filler 1071 to form a biofilm. The outer shell of the spherical cage-shaped suspended filler 107 can protect the biofilm on the surface of the regular tetrahedron fabric filler 1071 and play a three-dimensional supporting role to avoid blockage. The raw materials of the slow-release carbon source powder include, by weight: 50-100 parts of coconut shell powder, 50-100 parts of pine bark powder, and 20-50 parts of corn cob powder; the particle size of each powder is 1-20 mesh.

[0054] An overflow groove 110 is provided on the inner wall of the inner cylinder 102 around its circumference. A plurality of triangular overflow weirs 109 are distributed around the upper side of the inner wall of the overflow groove 110; the overflow groove 110 is connected to a water outlet pipe 111. The water flow is guided into the overflow groove 110 through the triangular overflow weir 109, and the water is discharged into the water outlet pipe 111 through the overflow groove 110.

[0055] The inner wall of the inner cylinder 102 is connected to the support 206. The top of the support 206 is connected to the thrust bearing 201 for realizing lateral rotation, and the top of the thrust bearing 201 is connected to the rotating beam bridge 202. The axis of the thrust bearing 201 is on the axis of the inner cylinder 102.

[0056] The top of the rotating beam bridge 202 is fixed to the annular aggregate trough 4, and the annular aggregate trough 4 is fixedly connected to the cloth pipe 3; the annular aggregate trough 4 is connected to the water inlet pipe 9. Above the annular aggregate trough 4, a composite sulfur-carbon source dosing device 8 is arranged. The composite sulfur-carbon source dosing device 8 is connected to the dosing machine support 7, and the dosing machine support 7 is fixedly connected to the rotating beam bridge 202. The bottom of the cloth pipe 3 is provided with cloth holes 301 facing the reaction zone 104. In order to achieve uniform cloth distribution, the distribution of the cloth holes 301 becomes gradually denser along the direction away from the axis of the inner cylinder 102; the circular area enclosed by the centers of every two adjacent cloth holes 301 rotating around the axis of the thrust bearing for one week is equal. The sewage to be treated enters the annular aggregate trough 4 through the water inlet pipe 9, and the composite sulfur-carbon source powder dosed by the composite sulfur-carbon source dosing device 8 also enters the annular aggregate trough 4, and uniformly enters the reaction zone 104 through the cloth holes 301 opened at the bottom of the cloth pipe 3 facing the reaction zone 104.

[0057] The raw materials of the composite sulfur-carbon source powder include, by weight: 50-100 parts of sulfur powder, 20-40 parts of pyrite, 20-40 parts of calcium carbonate stone powder, and 25-50 parts of coconut shell powder. The particle size of each powder is 50-200 mesh. In the composite sulfur-carbon source powder, the sulfur powder and pyrite powder provide a slow-release sulfur source for sulfur autotrophic denitrifying bacteria; the coconut shell powder provides a slow-release carbon source for heterotrophic denitrifying bacteria; the calcium carbonate stone powder can neutralize the sulfur autotrophic denitrification product sulfuric acid and maintain the pH value of the sewage neutral. The composite sulfur-carbon source powder is cheap and can be dosed according to the nitrate nitrogen concentration of the influent and effluent, avoiding over-dosing and saving more than 50% of the material cost.

[0058] The top of the side wall of the outer cylinder 101 is fixedly connected to the walkway board 106 in the direction away from the reaction zone 104, and the walking wheel 203 is in rolling connection with the walkway board 106. The rotary walking device 2 further includes a driving machine 204 and a transmission chain 205. The driving machine 204 is connected to the walking wheel 203 through the transmission chain 205, driving the walking wheel 203 to walk on the walkway board 106, and further driving the walking wheel 203 to rotate around the axis of the thrust bearing 201, that is, the walking wheel can perform circular motion with the axis of the inner cylinder as the center. The walking wheel can perform circular motion with the axis of the inner cylinder as the center, that is, it can drive the rotating beam bridge 202 to perform circular motion with the axis of the inner cylinder as the center, which can not only enable the cloth holes 301 opened at the bottom of the cloth pipe 3 facing the reaction zone 104 to uniformly enter the reaction zone 104, but also drive the scraping device 5 to stir, avoid the formation of dead zones, and promote the reaction.

[0059] The scraping and stirring device 5 includes a scraping and stirring vertical rod 501, a first stirring plate 503 and a second stirring plate 502. The scraping and stirring vertical rod 501 is fixedly connected to the rotating beam bridge 202. The middle part of the scraping and stirring vertical rod 501 is fixedly connected to the first stirring plate 503. The bottom of the scraping and stirring vertical rod 501 is fixedly connected to the second stirring plate 502, and the second stirring plate 502 is close to the bottom plate of the outer cylinder 101. The first stirring plate 503 cooperates with the second stirring plate 502 to stir the entire reaction zone 104, avoid the formation of dead zones, and promote the reaction. At the same time, since the second stirring plate 502 is close to the bottom plate of the outer cylinder 101, it can transfer solids into the solid-liquid precipitation separation zone 105.

[0060] The inclined plate packing 108 is connected to the inner wall of the inner cylinder 102, and the inclined plate packing 108 can achieve efficient solid-liquid separation.

[0061] The material recovery device 6 includes a reflux pump 601. The reflux pump 601 is respectively connected to the hydrocyclone 603 and the bottom plate of the inner cylinder 102 through a reflux pipe 602. The hydrocyclone 603 includes an upper cylindrical separation zone and a lower inverted conical separation zone, and the upper cylindrical separation zone and the lower inverted conical separation zone are connected. The upper cylindrical separation zone is provided with a feed inlet, and the top of the upper cylindrical separation zone is provided with a light material discharge port; the bottom of the lower inverted conical separation zone is provided with a heavy material discharge port; the heavy material discharge port is provided with a first control valve 604, and the first control valve is connected to the water inlet pipe 9; the light material discharge port is provided with a second control valve 605, and the second control valve 605 is connected to the sludge discharge pipe 606. The material recovery device forms sludge light materials and heavy material composite sulfur-carbon source powder from the treated solids separated in the solid-liquid precipitation separation zone 105, discharges the sludge light materials, and recovers and reuses the heavy material composite sulfur-carbon source powder.

[0062] The treatment process of the sulfur autotrophic-heterotrophic synergistic denitrification and nitrogen removal device is as follows:

[0063] The sewage to be treated enters the annular aggregate tank 4 through the water inlet pipe 9, and the composite sulfur-carbon source powder added by the composite sulfur-carbon source dosing device 8 also enters the annular aggregate tank 4, and uniformly enters the reaction zone 104 through the cloth holes 301 opened at the bottom of the cloth pipe 3 and driven by the rotating walking device 2.

[0064] Sulfur autotrophic denitrifying bacteria and sulfur heterotrophic co-denitrifying bacteria are adsorbed on the surface of the spherical cage-shaped suspended packing 107 to form a biofilm. The sulfur autotrophic denitrifying bacteria in the biofilm use elemental sulfur or sulfur compounds as electron donors and nitrate nitrogen in the sewage as electron acceptors to reduce nitrate nitrogen to nitrogen gas. The heterotrophic denitrifying bacteria in the biofilm use organic matter as an electron donor and nitrate nitrogen in the sewage as an electron acceptor to reduce nitrate nitrogen to nitrogen gas. Nitrogen gas is removed from the sewage in the form of bubbles, and the sewage is purified. During the denitrification process, the scraping and stirring device 5 stirs the entire reaction zone 104 driven by the rotating walking device 2 to avoid the formation of dead zones and promote the reaction.

[0065] After denitrification is completed, the spherical cage-shaped suspended packing 107 is intercepted in the reaction zone 104 by the vertical bar grille 103. The purified sewage flows through the vertical bar grille 103 and into the solid-liquid sedimentation separation zone 105, flowing from bottom to top. The sewage flowing into the solid-liquid sedimentation separation zone 105 carries the composite sulfur-carbon source powder that has not been adsorbed by the biofilm and the sludge shed from the biofilm. After being intensively separated by the inclined plate packing 108, the treated liquid and the treated solid are separated. The treated liquid is guided into the overflow tank 110 through the triangular overflow weir 109, and the water is discharged into the outlet pipe 111 through the overflow tank 110. The treated solid, under the action of the reflux pump 601, enters the hydrocyclone 603 through the reflux pipe 602. The hydrocyclone 603 separates to form light sludge and heavy composite sulfur-carbon source powder. If the sludge content is small, the light sludge and the heavy composite sulfur-carbon source powder are all merged into the inlet pipe 9 for recycling. If the sludge content is large, the second control valve 605 is opened, and the flow rate ratio of the second control valve 605 to the first control valve 604 is adjusted to 1:10 to 1:5. The heavy composite sulfur-carbon source powder is recovered, and the light sludge is discharged to the sludge treatment system through the sludge discharge pipe 606.

[0066] Example 2

[0067] Laboratory artificial wastewater is introduced into the sulfur autotrophic-heterotrophic co-denitrifying nitrogen removal device in Example 1. After debugging for 3 weeks, it operates stably for 30 days. After stable operation, laboratory artificial wastewater is continuously introduced. The hydraulic retention time is 24 h, the water temperature is controlled at 30 °C, the pH of the laboratory artificial wastewater is about 7.5 - 7.8, the total nitrogen in the influent is 197 mg / L - 242 mg / L, and the total nitrogen in the final effluent is 5 mg / L - 11 mg / L, with a total nitrogen removal rate of 96.4%.

[0068] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A sulfur autotrophic-heterotrophic synergistic denitrification and nitrogen removal device, characterized in that, It comprises a reactor body, which comprises an inner tube and an outer tube, a reaction zone is formed between the inner wall of the outer tube and the outer wall of the inner tube, and a ball cage-shaped suspended filler is placed in the reaction zone; a vertical bar grid is arranged at the bottom of the side wall of the inner tube, and the inner tube is a solid-liquid separation zone; the bottom plate of the inner tube is connected to a material recovery device; the top of the inner tube is connected to a rotating walking device, and the rotating walking device comprises a distribution pipe and a rotating beam bridge, the distribution pipe is connected to the rotating beam bridge, the rotating beam bridge is connected to a scraping and stirring device, and a walking wheel is arranged at the end of the rotating beam bridge, and the walking wheel can perform a circular motion with the axis of the inner tube as the center.

2. The sulfur autotrophic-heterotrophic synergistic denitrification and nitrogen removal device according to claim 1, characterized in that, The outer cylinder comprises an outer cylinder bottom plate, and the angle between the outer cylinder bottom plate and the horizontal plane is 5 to 15 degrees; Alternatively, the angle between the bottom plate of the inner cylinder and the horizontal plane is 45-60°.

3. The sulfur autotrophic-heterotrophic synergistic denitrification and nitrogen removal device according to claim 1, wherein, The interior of the cage-shaped suspension filler is filled with a regular tetrahedron fabric filler, and the interior of the regular tetrahedron fabric filler is filled with a slow-release carbon source powder; Preferably, the raw materials of the slow-release carbon source powder include, by weight: 50-100 parts of coconut shell powder, 50-100 parts of pine bark, and 20-50 parts of corn cob powder; the particle size of each powder is 1-20 mesh.

4. The sulfur autotrophic-heterotrophic synergistic denitrification and nitrogen removal device according to claim 1, wherein The inner wall of the inner cylinder is connected to a bracket, the top of the bracket is connected to a thrust bearing for realizing lateral rotation, and the top of the thrust bearing is connected to a rotating beam bridge; preferably, the axis of the thrust bearing is on the axis of the inner cylinder; Or, the top of the rotating beam bridge is fixed to the annular aggregate trough, and the annular aggregate trough is fixed to the material distribution pipe; Preferably, the annular aggregate trough is connected to a water inlet pipe; Preferably, a composite sulfur-carbon source dosing device is provided above the annular collecting trough, the composite sulfur-carbon source dosing device is connected to a dosing machine bracket, and the dosing machine bracket is fixedly connected to the rotating beam bridge; Preferably, a distribution hole is provided at the bottom of the distribution pipe toward the reaction zone.

5. The sulfur autotrophic-heterotrophic synergistic denitrification and nitrogen removal device according to claim 1, characterized in that The top of the side wall of the outer cylinder is fixedly connected to a walkway plate in a direction away from the reaction zone, and the walking wheel is rollingly connected to the walkway plate.

6. The sulfur autotrophic-heterotrophic co-denitrification nitrogen removal device according to claim 1, wherein, The rotary walking device also includes a driving machine and a transmission chain, and the driving machine is connected to the walking wheel through the transmission chain.

7. The sulfur autotrophic-heterotrophic synergistic denitrification and nitrogen removal device according to claim 1, characterized in that, The scraping and stirring device includes a scraping and stirring rod, a first stirring plate and a second stirring plate. The scraping and stirring rod is fixedly connected to the rotating beam bridge, the middle part of the scraping and stirring rod is fixedly connected to the first stirring plate, the bottom of the scraping and stirring rod is fixedly connected to the second stirring plate, and the second stirring plate is close to the bottom plate of the outer cylinder.

8. The sulfur autotrophic-heterotrophic synergistic denitrification and nitrogen removal device according to claim 1, characterized in that, The material recovery device comprises a reflux pump, which is respectively connected to the cyclone separator and the bottom plate of the inner cylinder.

9. The sulfur autotrophic-heterotrophic co-denitrification nitrogen removal device according to claim 1, characterized in that, The inner wall of the inner cylinder is connected with an inclined plate filler.

10. A sulfur autotrophic-heterotrophic synergistic denitrification and nitrogen removal method, characterized in that, The steps include: The sewage and the composite sulfur-carbon source powder are uniformly added to the reaction zone where the cage-shaped suspended filler is placed, and the sulfur autotrophic denitrifying bacteria and the sulfur heterotrophic synergistic denitrifying bacteria are adsorbed on the surface of the cage-shaped suspended filler to carry out denitrification; After denitrification, the mixed liquid is separated into solid and liquid to obtain treated liquid and treated solid respectively; the treated liquid is discharged after being tested and qualified; The treated solid is separated into light sludge material and heavy material composite sulfur-carbon source powder, and the light sludge material and heavy material composite sulfur-carbon source powder are discharged for recycling.

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