Sulfur autotrophic denitrification sewage treatment system and use method

Abstract

The invention discloses a sulfur autotrophic denitrification sewage treatment system and a use method. The sulfur autotrophic denitrification sewage treatment system comprises a reactor body, a biological filler system, a solid-liquid two-phase separation system, a material distribution system, a material adding system, a material recovery system and an equipment bracket system, the reactor body comprises a cylindrical shell, a biological filler system is arranged in the cylindrical shell, the biological filler system comprises a filler bracket and a plurality of layers of biological fillers, the biological fillers are arranged on the filler bracket, and the filler bracket is fixed on a wall plate of the cylindrical shell; the material distribution system is arranged at the upper end of the biological filler system, and the solid-liquid two-phase separation system is arranged at the lower end; a material adding system is arranged at the upper end of the material distributing system, and a material recycling system is arranged at one end of the material adding system; rapid treatment of sewage can be realized, the treatment cost is effectively reduced, and small head loss, no blockage, no hydraulic dead zone and no need of backwashing are ensured; and the occupied area can be saved.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a sulfur autotrophic denitrification sewage treatment system and a use method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In the process of sewage treatment, nitrogen removal is an important link, among which the removal of nitrate nitrogen in low carbon-nitrogen ratio sewage is particularly important. Traditional denitrification processes mostly rely on heterotrophic denitrification, which requires the addition of a large amount of organic carbon source, which not only increases the treatment cost, but also may cause secondary pollution problems. Sulfur autotrophic denitrification, as a new type of denitrification technology, uses sulfur and its compounds as electron donors to achieve efficient removal of nitrate nitrogen without the need to add additional organic carbon sources, and has broad application prospects.

[0004] However, the current sulfur autotrophic denitrification technology has a large head loss problem during the solid-liquid separation stage of sewage treatment, which is not convenient for water flow; and the biological filler is unevenly arranged and easily blocked. If blockage occurs, the sewage will not be able to continue to flow, affecting the progress of sewage treatment; and the inconvenience of water flow will slow down the flow rate, which will lead to the appearance of hydraulic dead zones. The appearance of hydraulic dead zones will also slow down the water flow rate and reduce the treatment efficiency; during the use of the existing sulfur autotrophic denitrification technology, sulfur autotrophic denitrifying bacteria biofilm will grow on the surface of the filter material, and at the same time adsorb SS in the water, thereby blocking the gaps between the filter materials, causing the filter material layer to be blocked, affecting the use, and therefore requires regular backwashing, that is, it is necessary to flush before continuing the treatment, and backwashing also leads to low treatment efficiency; that is, the problems of head loss, blockage, hydraulic dead zones and the need for repeated flushing lead to low overall efficiency of sewage treatment and inability to quickly treat; and a large amount of purifiers need to be invested during treatment, resulting in high cost of sewage treatment, so it still needs further optimization and innovation. Summary of the invention

[0005] In view of the above problems, the present invention provides a sulfur autotrophic denitrification sewage treatment system and a method of use, which can achieve rapid sewage treatment, effectively reduce treatment costs, and ensure small head loss, no blockage, no hydraulic dead zone, and no need for backwashing; it can also save floor space.

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

[0007] A sulfur autotrophic denitrification sewage treatment system comprises a reactor body, a biological filler system, a solid-liquid two-phase separation system, a material distribution system, a material addition system, a material recovery system and an equipment support system; the reactor body comprises a cylindrical shell, a biological filler system is arranged in the cylindrical shell, the biological filler system comprises a filler support and a biological filler, the biological filler is arranged in multiple layers, the biological filler is arranged on the filler support, and the filler support is fixed on the wall plate of the cylindrical shell;

[0008] A distribution system is arranged at the upper end of the biological filler system, and a solid-liquid two-phase separation system is arranged at the lower end; a material adding system is arranged at the upper end of the distribution system, and a material recovery system is arranged at one end of the material adding system; the solid-liquid two-phase separation system comprises a water collecting pipe, a solid-liquid two-phase separator is arranged at the lower end of the water collecting pipe, an overflow pipe is arranged at one end of the solid-liquid two-phase separator, an overflow trough is arranged at one end of the overflow pipe, and a water outlet pipe is arranged at one end of the overflow trough.

[0009] Furthermore, the reactor body also includes an inverted cone shell, and the cylindrical shell and the inverted cone shell are fixedly connected; the wall plate of the inverted cone shell is inclined to the horizontal plane.

[0010] Furthermore, the biological filler and the biological filler support are both arranged in a cylindrical shell, the biological filler is fixedly connected to the filler support at an angle, and adjacent biological fillers are inclined in opposite directions; a plurality of biological filler supports are arranged at intervals, and a filler interlayer area is provided between the plurality of biological filler supports.

[0011] Furthermore, the solid-liquid two-phase separator and the water collecting pipe are arranged inside the cylindrical shell; the overflow pipe, the overflow trough and the water outlet pipe are arranged outside the cylindrical shell; the solid-liquid two-phase separator, the water collecting pipe, the overflow pipe, the overflow trough and the water outlet pipe are connected in sequence.

[0012] Furthermore, the solid-liquid two-phase separator is an inverted cone-shaped cover, the wall plate of the solid-liquid two-phase separator is inclined to the horizontal plane, and the solid-liquid two-phase separator is fixed on the wall plate of the cylindrical shell.

[0013] Furthermore, the material distribution system includes a water inlet pipe, the outlet end of which is located above the material distribution trough, one end of the material distribution trough is connected to the material distribution riser, one end of the material distribution riser is connected to the material distribution cross pipe, and a plurality of material distribution holes are arranged at intervals at the lower end of the material distribution cross pipe.

[0014] Furthermore, a thrust bearing is arranged at the lower end of the material distribution trough, a driven gear is arranged on the upper sleeve of the material distribution trough, a driving gear is arranged at one end of the driven gear, the driven gear and the driving gear are meshed, and the driving gear is connected to the output end of the adjustable driving machine; a diagonal tie rod is arranged between the material distribution vertical pipe and the material distribution horizontal pipe.

[0015] Furthermore, the material recovery system includes a material reflux pump, and a material reflux pipe is arranged at one end of the material reflux pump; the inlet end of the material reflux pipe is connected to the bottom of the inverted cone shell, and the outlet end of the material reflux pipe is connected to the material cyclone.

[0016] Furthermore, a material outlet pipe is arranged on the side of the material cyclone, and a first control valve is arranged on the material outlet pipe; a sludge outlet pipe is arranged at the lower end of the material cyclone, and the inlet end of the sludge outlet pipe is located inside the material cyclone, and a second control valve is arranged on the sludge outlet pipe; the material recovery system is arranged on the equipment support system.

[0017] A method for using a sulfur autotrophic denitrification sewage treatment system comprises the following steps:

[0018] The sewage flows into the distribution trough from the water inlet pipe, and the sulfur powder or sulfur compound powder added by the material adding system is mixed with the sewage. Then the distribution system evenly distributes the material from the top of the reactor body and flows downward. When flowing through the biological filler layer, the sulfur powder or sulfur compound powder is adsorbed by the biological filler;

[0019] Then the treated sewage continues to flow downward, and solid-liquid separation is achieved when flowing through the solid-liquid two-phase separator layer, and the sewage is discharged through the water collecting pipe, the overflow pipe, the overflow tank and the outlet pipe;

[0020] The sulfur powder or sulfur compound powder with a large specific gravity and the biofilm sludge shed from the biological filler settle to the bottom of the inverted cone shell, are recovered by the material recovery system and refluxed to the distribution system, and are mixed with the newly-input sewage and the newly-added sulfur powder or sulfur compound powder to be evenly distributed and enter from the top of the reactor body, and the excess biofilm sludge is discharged regularly;

[0021] Detect the nitrate nitrogen content in the inlet and outlet water and the sulfur powder or sulfur compound powder content in the material reflux pipe, and adjust the amount of sulfur powder or sulfur compound powder added according to the process requirements; when the effluent is detected to be elevated and the remaining biofilm sludge needs to be discharged, open the second control valve at this time to control the flow rate ratio of the sludge outlet pipe to the material outlet pipe, and perform cyclone centrifugal separation through the material cyclone separator to return the heavy sulfur powder or sulfur compound powder to the distribution system, and discharge the light remaining biofilm sludge to the sludge treatment system.

[0022] Compared with the prior art, the present invention has the following advantages and positive effects:

[0023] 1. The present invention cooperates with a reactor body, a biological filler system, a solid-liquid two-phase separation system, a distribution system, a material addition system, and a material recovery system. The biological filler of the biological filler system adsorbs substances in sewage. The biological filler is provided with multiple layers, and adjacent biological fillers are inclined in opposite directions, so that the water and material distribution is uniform and will not be blocked. The nitrogen bubble upflow of the denitrification product can enhance the uniform water and material distribution effect; the diameter of the pipe opening at the end of the overflow pipe of the solid-liquid two-phase separation system becomes larger, reducing the head loss of the overflow weir, thereby realizing the rapid treatment of sewage.

[0024] 2. The biological fillers used in the present invention are of the tethered type, and the gaps between the fillers are large and will not be blocked. In addition, the distribution system realizes the uniform water distribution through rotation, and the two-phase separator discharges water uniformly at multiple points, that is, the water inlet is from the top and the water outlet is from the bottom; in addition, the stirring effect of the nitrogen bubbles produced by the sulfur autotrophic denitrification product makes the water flow uniform, without hydraulic dead zone, and the fillers will not be blocked, so there is no need for backwashing.

[0025] 2. The present invention is provided with a material recovery system. The sulfur powder or sulfur compound powder with a large specific gravity and the biofilm sludge fallen off the biological filler settle to the bottom of the inverted cone shell, are recovered by the material recovery system and refluxed to the distribution system, and are mixed with the newly-input sewage and the newly-added sulfur powder or sulfur compound powder. The distribution enters from the top of the reactor body, and the excess biofilm sludge is discharged regularly, making full use of the sulfur powder or sulfur compound powder and reducing the processing cost. In addition, the sulfur powder or sulfur compound powder is used as the sulfur source, which saves more than 50% of the sulfur source cost compared with the sulfur autotrophic denitrification filter.

[0026] 3. The number of packing layers of the present invention is two or an even number greater than two, which increases the height of the reactor body and reduces the floor space.

[0027] 4. The present invention can adjust the dosage of the sulfur source according to the nitrogen mass concentration of the sewage and the discharge requirements, has strong adaptability to water quality, and has good and stable treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0029] Figure 1 This is a diagram of a sulfur autotrophic denitrification wastewater treatment system of the present invention;

[0030] In the figure: 1-reactor body; 101-cylindrical shell; 102-inverted cone shell;

[0031] 2-biological filler system; 201-biological filler; 202-filler support; 203-filler interlayer area;

[0032] 3-solid-liquid two-phase separation system; 301-solid-liquid two-phase separator; 302-water collecting pipe; 303-overflow pipe; 304-overflow tank; 305-water outlet pipe;

[0033] 4-fabricating system; 401-water inlet pipe; 402-fabricating trough; 403-fabricating riser; 404-fabricating transverse pipe; 405-inclined tie rod; 406-fabricating hole; 407-thrust bearing; 408-driven gear; 409-adjustable driving machine; 410-driving gear;

[0034] 5-Material dosing system;

[0035] 6-Material recovery system; 601-Material reflux pump; 602-Material reflux pipe; 603-Material cyclone; 604-Material outflow pipe; 605-First control valve; 606-Sludge outflow pipe; 607-Second control valve;

[0036] 7- Equipment support system. DETAILED DESCRIPTION

[0037] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0038] At present, the relevant technologies have problems such as large head loss, easy blockage, hydraulic dead zone, and the need for backwashing, which leads to low sewage treatment efficiency. In addition, a large amount of purifiers need to be invested during treatment, resulting in high costs. Therefore, further optimization and innovation are still needed.

[0039] Embodiment 1:

[0040] The present invention is described in detail below in conjunction with the accompanying drawings. The present embodiment discloses a sulfur autotrophic denitrification wastewater treatment system, such as Figure 1 As shown, it includes a reactor body 1, a biological filler system 2, a solid-liquid two-phase separation system 3, a distribution system 4, a material addition system 5, a material recovery system 6 and an equipment support system 7; the reactor body 1 includes a cylindrical shell 101, and the biological filler system 2 is arranged in the cylindrical shell 101. The biological filler system 2 includes a filler support 202 and a biological filler 201. The biological filler 201 is arranged in multiple layers. The biological filler 201 is arranged on the filler support 202, and the filler support 202 is fixed on the wall plate of the cylindrical shell 101; the distribution system 4 is arranged at the upper end of the biological filler system 2, and the solid-liquid two-phase separation system 3 is arranged at the lower end; the material addition system is arranged at the upper end of the distribution system 4, and the material recovery system 6 is arranged at one end of the material addition system;

[0041] Through the cooperation of the reactor body 1, the biological filler system 2, the solid-liquid two-phase separation system 3, the distribution system 4, the material addition system 5, and the material recovery system 6, the biological filler 201 of the biological filler system 2 is used to adsorb the substances in the sewage. The biological filler 201 is provided with multiple layers, and the adjacent biological fillers 201 are inclined in opposite directions. The water and material distribution is uniform and will not be blocked. The nitrogen bubble upflow of the denitrification product can enhance the uniform water and material distribution effect; the diameter of the end pipe mouth of the overflow pipe 303 of the solid-liquid two-phase separation system 3 is enlarged, which reduces the head loss of the overflow weir, thereby realizing the rapid treatment of sewage and ensuring that there is no hydraulic dead zone and no need for backwashing.

[0042] The solid-liquid two-phase separation system 3 includes a water collecting pipe 302, a solid-liquid two-phase separator 301 is arranged at the lower end of the water collecting pipe 302, an overflow pipe 303 is arranged at one end of the solid-liquid two-phase separator 301, an overflow trough 304 is arranged at one end of the overflow pipe 303, and an outlet pipe 305 is arranged at one end of the overflow trough 304. The solid-liquid two-phase separator 301 and the water collecting pipe 302 are arranged inside the cylindrical shell 101; the overflow pipe 303, the overflow trough 304 and the outlet pipe 305 are arranged outside the cylindrical shell 101; the solid-liquid two-phase separator 301, the water collecting pipe 302, the overflow pipe 303, the overflow trough 304 and the outlet pipe 305 are connected in sequence. The solid-liquid two-phase separator 301 is an inverted cone cover, the wall plate of the solid-liquid two-phase separator 301 is inclined to the horizontal plane, and the solid-liquid two-phase separator 301 is fixed on the wall plate of the cylindrical shell 101.

[0043] The solid-liquid two-phase separation system 3 is used to make the treated sewage continue to flow downward, and solid-liquid separation is achieved when flowing through the solid-liquid two-phase separator 301 layer. The sewage is discharged through the water collecting pipe 302, the overflow pipe 303, the overflow trough 304, and the outlet pipe 305. The diameter of the end of the overflow pipe 303 is enlarged to reduce the head loss of the overflow weir. The angle between the cover wall plate of the solid-liquid two-phase separator 301 and the horizontal plane is 45-60°, which is convenient for sewage flow.

[0044] The reactor body 1 further comprises an inverted cone shell 102, the cylindrical shell 101 and the inverted cone shell 102 are fixedly connected; the wall plate of the inverted cone shell 102 is inclined to the horizontal plane. The angle between the wall plate of the inverted cone shell 102 of the reactor body 1 and the horizontal plane is 45-60 degrees.

[0045] The reactor body 1 has water inlet at the top and outlet at the bottom, and the solid-liquid two-phase separator 301 is below the biological filler 201. The sewage, sulfur powder or sulfur compound powder and the biofilm sludge dropped from the biological filler 201 flow downward in the same direction. The solid-liquid two-phase separation is not affected by the nitrogen bubble upflow of the denitrification product and the sewage downflow, and the solid-liquid two-phase separation effect is good. Compared with the solid-liquid-gas three-phase separator of the sewage treatment device, the solid-liquid two-phase separator 301 can be set in a single layer, saving more than 50% of the material consumption.

[0046] The biological filler 201 and the biological filler 201 support are both arranged in the cylindrical shell 101. The biological filler 201 is tilted and fixed on the support 202, and the adjacent biological fillers 201 are tilted in opposite directions. Several biological filler 201 supports are arranged at intervals, and a filler interlayer area 203 is provided between several biological filler 201 supports.

[0047] The biological filler 201 is a hydrophilic fiber fabric with stable chemical properties, which is fixedly connected to the filler support 202 at an angle of 60-85°; the biological filler 201 is arranged in two layers or an even number of layers greater than two; the inclination directions of two adjacent layers of biological fillers 201 are opposite; and a filler interlayer area 203 of 15-30 cm is arranged between two adjacent layers of biological fillers 201. The water and material distribution is uniform and will not be blocked. The nitrogen bubble upflow of the denitrification product can enhance the uniform water and material distribution effect, and due to the arrangement of multiple layers, the height of the reactor body 1 is increased and the floor space is reduced.

[0048] The material distribution system 4 includes a water inlet pipe 401, the outlet end of which is located above a material distribution trough 402, one end of which is connected to a material distribution vertical pipe 403, one end of which is connected to a material distribution horizontal pipe 404, and a plurality of material distribution holes 406 are arranged at intervals at the lower end of the material distribution horizontal pipe 404. A thrust bearing 407 is arranged at the lower end of the material distribution trough 402, a driven gear 408 is sleeved on the upper part of the material distribution trough 402, a driving gear 410 is arranged at one end of the driven gear 408, the driven gear 408 is meshed with the driving gear 410, and the driving gear 410 is connected to the output end of an adjustable driving machine 409;

[0049] The adjustable driving machine 409 starts to drive the driving gear 410 to rotate, the driving gear 410 drives the driven gear 408 to rotate, and the driven gear 408 drives the material distribution trough 402 to rotate. That is, when the adjustable driving machine 409 rotates, the material distribution system 4 is driven to rotate around the centroid of the thrust bearing 407 to achieve uniform mixing.

[0050] An inclined rod 405 is arranged between the material distribution vertical pipe 403 and the material distribution horizontal pipe 404, and the inclined rod 405 can improve the stability of the system. The distribution of the material distribution holes 406 in the material distribution horizontal pipe 404 is sparse in the middle, dense at the far end, and asymmetric at both ends, which improves the uniformity of the material distribution.

[0051] The material recovery system 6 includes a material reflux pump 601, and a material reflux pipe 602 is arranged at one end of the material reflux pump 601; the inlet end of the material reflux pipe 602 is connected to the bottom of the inverted cone shell 102, and the outlet end of the material reflux pipe 602 is connected to the material cyclone 603. A material outlet pipe 604 is arranged on the side of the material cyclone 603, and a first control valve 6065 is arranged on the material outlet pipe 604; a sludge outlet pipe 606 is arranged at the lower end of the material cyclone 603, and the inlet end of the sludge outlet pipe 606 is located inside the material cyclone 603, and a second control valve 607 is arranged on the sludge outlet pipe 606;

[0052] The inlet end of the sludge outlet pipe 606 is connected to the material cyclone 603, and the outlet end is connected to the sludge treatment system. The material return pump 601 is a variable frequency pump, which automatically controls the operating frequency and flow rate.

[0053] The material cyclone 603 is cylindrical; the outlet end of the material return pipe 602 is located in the tangent direction of the middle part of the material cyclone 603; the inlet end of the material outlet pipe 604 is located in the tangent direction of the bottom of the material cyclone 603; the inflow of the material return pipe 602 and the outflow of the material outlet pipe 604 are both clockwise or counterclockwise; the inlet end of the sludge outlet pipe 606 is located in the top center area of ​​the material cyclone 603. The material outlet pipe 604 is provided with a first control valve 6065 for automatically controlling the outflow flow rate; the sludge outlet pipe 606 is provided with a second control valve 607 for automatically controlling the outflow flow rate.

[0054] The material recovery system 6 is arranged on the equipment support system 7. The equipment support system 7 can be a support platform for supporting various equipment. The material adding system 5 is arranged above the material distribution system 4, and the material adding system 5 discharge port is connected to the above of the material distribution trough 402. The material adding system 5 is an automatic powder adding machine, and the automatic powder adding machine is a prior art.

[0055] Embodiment 2:

[0056] A method for using a sulfur autotrophic denitrification sewage treatment system comprises the following steps:

[0057] The sewage flows into the distribution tank 402 from the water inlet pipe 401, and the sulfur powder or sulfur compound powder added by the material adding system 5 is mixed with the sewage. Then the distribution system 4 evenly distributes the material from the top of the reactor body 1 and flows downward. When flowing through the biological filler 201 layer, the sulfur powder or sulfur compound powder is adsorbed by the biological filler 201;

[0058] Then the treated sewage continues to flow downward, and solid-liquid separation is achieved when flowing through the solid-liquid two-phase separator 301 layer, and the sewage is discharged through the water collecting pipe 302, the overflow pipe 303, the overflow tank 304 and the outlet pipe 305;

[0059] The sulfur powder or sulfur compound powder with a high specific gravity and the biofilm sludge that falls off the biological filler 201 settle to the bottom of the inverted cone shell 102, are recovered by the material recovery system 6 and reflux to the distribution system 4, are remixed with the newly-input sewage and the newly-added sulfur powder or sulfur compound powder, and are evenly distributed and enter from the top of the reactor body 1, and the excess biofilm sludge is discharged regularly.

[0060] Detect the nitrate nitrogen content of the inlet and outlet water and the sulfur powder or sulfur compound powder content of the material reflux pipe 602, adjust the amount of sulfur powder or sulfur compound powder added according to the process needs, and have strong adaptability to water quality, ensure the denitrification treatment effect, and avoid excessive waste of sulfur source. Nitrate nitrogen content detection is based on the national standard GB / T11894-2015 "Colorimetric method for determination of nitrate nitrogen in water quality", and sulfur powder or sulfur compound powder content detection can be observed by naked eye;

[0061] Sulfur autotrophic denitrifying bacteria grow slowly, and usually do not need to discharge the remaining biofilm sludge. When the effluent is detected to be elevated, the remaining biofilm sludge needs to be discharged. At this time, the second control valve 607 needs to be opened to control the flow rate of the sludge outlet pipe 606 to the flow rate of the material outlet pipe 604 at a ratio of 1:20-1:5. The heavy sulfur powder or sulfur compound powder is refluxed to the material distribution system 4 to avoid loss through the material cyclone 603, and the light remaining biofilm sludge is discharged to the sludge treatment system. The sulfur autotrophic denitrification sewage treatment system and method of the present invention can achieve a total nitrogen removal rate of more than 96%.

[0062] When SS is detected to be ≥10mg / L, discharge of excess biofilm sludge can be considered; the ratio of the flow rate of the sludge outlet pipe 606 to the flow rate of the material outlet pipe 604 can be controlled by setting the pipe diameter and the opening degree of the valve, and a flow meter can be installed for judgment.

[0063] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A sulfur autotrophic denitrification wastewater treatment system, characterized in that: It includes a reactor body, a biological filler system, a solid-liquid two-phase separation system, a material distribution system, a material addition system, a material recovery system and an equipment support system; the reactor body includes a cylindrical shell, the biological filler system is arranged in the cylindrical shell, the biological filler system includes a filler support and a biological filler, the biological filler is arranged in multiple layers, the biological filler is arranged on the filler support, and the filler support is fixed on the wall plate of the cylindrical shell; A distribution system is arranged at the upper end of the biological filler system, and a solid-liquid two-phase separation system is arranged at the lower end; a material adding system is arranged at the upper end of the distribution system, and a material recovery system is arranged at one end of the material adding system; the solid-liquid two-phase separation system comprises a water collecting pipe, a solid-liquid two-phase separator is arranged at the lower end of the water collecting pipe, an overflow pipe is arranged at one end of the solid-liquid two-phase separator, an overflow trough is arranged at one end of the overflow pipe, and a water outlet pipe is arranged at one end of the overflow trough.

2. A sulfur autotrophic denitrification wastewater treatment system as claimed in claim 1, characterized in that: The reactor body also includes an inverted cone shell, and the cylindrical shell and the inverted cone shell are fixedly connected; the wall plate of the inverted cone shell is inclined to the horizontal plane.

3. A sulfur autotrophic denitrification wastewater treatment system according to claim 1, characterized in that: The biological filler and the biological filler support are both arranged in a cylindrical shell. The biological filler is fixedly connected to the filler support at an angle, and the adjacent biological fillers are inclined in opposite directions. A plurality of biological filler supports are arranged at intervals, and a filler interlayer area is provided between the plurality of biological filler supports.

4. A sulfur autotrophic denitrification wastewater treatment system according to claim 1, characterized in that: The solid-liquid two-phase separator and the water collecting pipe are arranged in the cylindrical shell; the overflow pipe, the overflow trough and the water outlet pipe are arranged outside the cylindrical shell; the solid-liquid two-phase separator, the water collecting pipe, the overflow pipe, the overflow trough and the water outlet pipe are connected in sequence.

5. A sulfur autotrophic denitrification wastewater treatment system as claimed in claim 4, characterized in that: The solid-liquid two-phase separator is an inverted cone-shaped cover, the wall plate of the solid-liquid two-phase separator is inclined to the horizontal plane, and the solid-liquid two-phase separator is fixed on the wall plate of the cylindrical shell.

6. A sulfur autotrophic denitrification wastewater treatment system according to claim 1, characterized in that: The material distribution system includes a water inlet pipe, the outlet end of which is located above a material distribution trough, one end of the material distribution trough is connected to a material distribution riser, one end of the material distribution riser is connected to a material distribution transverse pipe, and a plurality of material distribution holes are arranged at intervals at the lower end of the material distribution transverse pipe.

7. A sulfur autotrophic denitrification wastewater treatment system as claimed in claim 6, characterized in that: A thrust bearing is arranged at the lower end of the material distribution trough, a driven gear is sleeved on the upper part of the material distribution trough, a driving gear is arranged at one end of the driven gear, the driven gear is meshed with the driving gear, and the driving gear is connected to the output end of the adjustable driving machine; a diagonal tie rod is arranged between the material distribution vertical pipe and the material distribution horizontal pipe.

8. A sulfur autotrophic denitrification wastewater treatment system as claimed in claim 1, characterized in that: The material recovery system comprises a material reflux pump, one end of which is provided with a material reflux pipe; the inlet end of the material reflux pipe is connected to the bottom of the inverted cone shell, and the outlet end of the material reflux pipe is connected to the material cyclone.

9. A sulfur autotrophic denitrification wastewater treatment system as claimed in claim 8, characterized in that: A material outlet pipe is arranged on the side of the material cyclone, and a first control valve is arranged on the material outlet pipe; a sludge outlet pipe is arranged at the lower end of the material cyclone, and an inlet end of the sludge outlet pipe is located inside the material cyclone, and a second control valve is arranged on the sludge outlet pipe; the material recovery system is arranged on the equipment support system.

10. The method for using the sulfur autotrophic denitrification wastewater treatment system according to any one of claims 1 to 9, characterized in that: The following steps are involved: The sewage flows into the distribution trough from the water inlet pipe, and the sulfur powder or sulfur compound powder added by the material adding system is mixed with the sewage. Then the distribution system evenly distributes the material from the top of the reactor body and flows downward. When flowing through the biological filler layer, the sulfur powder or sulfur compound powder is adsorbed by the biological filler; Then the treated sewage continues to flow downward, and solid-liquid separation is achieved when flowing through the solid-liquid two-phase separator layer, and the sewage is discharged through the water collecting pipe, the overflow pipe, the overflow tank and the outlet pipe; The sulfur powder or sulfur compound powder with a large specific gravity and the biofilm sludge shed from the biological filler settle to the bottom of the inverted cone shell, are recovered by the material recovery system and refluxed to the distribution system, and are mixed with the newly-input sewage and the newly-added sulfur powder or sulfur compound powder to be evenly distributed and enter from the top of the reactor body, and the excess biofilm sludge is discharged regularly; Detect the nitrate nitrogen content in the inlet and outlet water and the sulfur powder or sulfur compound powder content in the material return pipe, and adjust the amount of sulfur powder or sulfur compound powder added according to the process requirements; when the water outlet is detected to be elevated and the remaining biofilm sludge needs to be discharged, open the second control valve at this time to control the flow rate ratio of the sludge outlet pipe to the material outlet pipe, and perform cyclone centrifugal separation through the material cyclone separator to return the heavy sulfur powder or sulfur compound powder to the distribution system, and discharge the light remaining biofilm sludge to the sludge treatment system.

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