Sulfur autotrophic nitrogen removal plate and sulfur autotrophic denitrification nitrogen removal system with same

Abstract

The invention provides a sulfur autotrophic nitrogen removal plate and a sulfur autotrophic denitrification nitrogen removal system with the same, and relates to the technical field of sewage treatment. Comprising a reaction container and an inclined plate denitrification module filled in the reaction container, the inclined plate denitrification module comprises a vertical frame and a plurality of sulfur autotrophic denitrification plates which are positioned in the vertical frame, are parallel to one another and are obliquely arranged, the area of each sulfur autotrophic denitrification plate is not greater than 1.2 m < 2 >, and the thickness of each sulfur autotrophic denitrification plate is 6-12mm. According to the application, the sulfur autotrophic nitrogen removal plates are obliquely arranged in the reaction container, the sulfur autotrophic nitrogen removal plates are parallel to one another, a certain gap is formed between the sulfur autotrophic nitrogen removal plates, the sulfur autotrophic nitrogen removal plates can be used as a water flow channel, and nitrogen generated by a denitrification nitrogen removal reaction can be quickly discharged in the smooth water flow channel and cannot be accumulated, so that the problem of'air resistance 'cannot occur; the whole system only generates local head loss in water distribution and baffling areas, and the total head loss of the system can be controlled to be about 0.5 m.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a sulfur autotrophic denitrification plate and a sulfur autotrophic denitrification system having the same. Background Art

[0002] At present, the engineering route of sulfur autotrophic denitrification technology is generally to make sulfur-containing substances, alkalinity-releasing substances and related inorganic salts into regular or irregular granular filter materials, and then fill the granular filter materials into the denitrification filter tank of the sewage treatment plant, and regularly replenish the filter materials consumed by the denitrification reaction, so as to achieve the purpose of deep denitrification of the sewage treatment plant.

[0003] However, using sulfur autotrophic granular filter media for filling denitrification filters presents numerous drawbacks. First, the fill height of the granular filter media in sulfur autotrophic filters is generally no less than 1.5 meters. In addition to the naturally growing autotrophic biofilm, it also traps a large amount of suspended matter. Furthermore, the nitrogen gas generated by denitrification creates a certain amount of air resistance. Overall, this results in a high head loss in the sulfur autotrophic filter, and the engineering design value is generally no less than 2 meters. This high head loss results in significant energy consumption, making sulfur autotrophic denitrification technology unsuitable for some wastewater treatment plants that cannot accommodate such a high head loss. Second, the maximum fill height for sulfur autotrophic denitrification filters is generally 3 meters. Exceeding this height compromises backwash efficiency, necessitating the expansion of the filtration area to achieve the desired denitrification rate. Furthermore, sulfur autotrophic denitrification filters are often up to 6 meters deep, but approximately 1.5 meters above the top of the filter media is unused (reserved space to reduce backwash media runoff), resulting in a considerable waste of tank capacity. Third, in order to avoid clogging of the filter layer, sulfur autotrophic denitrification filters often use air-water combined backwashing, which requires a series of electro-pneumatic valve components, water pump devices and fan devices, etc. The operating energy consumption is also high. At the same time, the machine needs to be shut down for backwashing, which reduces the efficiency of the filter.

[0004] Therefore, the above technical defects seriously restrict the engineering promotion value of sulfur autotrophic denitrification technology. Summary of the Invention

[0005] In order to improve the problems of large head loss, large floor space and complex operation system in filter tanks filled with sulfur autotrophic granular filter media, the present application provides a sulfur autotrophic denitrification plate and a sulfur autotrophic denitrification system having the same.

[0006] In a first aspect, the present application provides a sulfur autotrophic denitrification plate for a sulfur autotrophic denitrification system, which adopts the following technical solution: A sulfur autotrophic denitrification plate for a sulfur autotrophic denitrification system. The sulfur autotrophic denitrification plate (72) is made into a plate-shaped structure by a dry plate making method and comprises the following raw materials by mass percentage: 50-60% elemental sulfur powder, 10-20% alkalinity substance powder, 20-30% sulfur-containing mineral powder, and 5-10% adhesive.

[0007] Optionally, the alkalinity substance powder is calcium carbonate or sodium bicarbonate; the sulfur-containing mineral powder can be pyrite, pyrrhotite, siderite, etc.; and the binder can be an alkali metal, such as calcium oxide, manganese oxide, etc.

[0008] The present application makes the sulfur-containing substance into a plate-like structure, which can provide sulfur-containing substances and other electron donors for sulfur autotrophic denitrification, and can also serve as a habitat for microorganisms. Moreover, the plate-like structure can construct a sedimentation tank of the "shallow pool theory".

[0009] In a second aspect, the present application provides a sulfur autotrophic denitrification system having the sulfur autotrophic denitrification plate, which adopts the following technical solution: A sulfur autotrophic denitrification system comprises: a reaction vessel and an inclined plate denitrification module filled in the reaction vessel, wherein the inclined plate denitrification module comprises a vertical frame and a plurality of sulfur autotrophic denitrification plates arranged parallel to each other and inclined in the vertical frame, wherein the area of ​​the sulfur autotrophic denitrification plates is not greater than 1.2 m 2 , thickness is 6~12mm.

[0010] Optionally, the inclination angle of the sulfur autotrophic denitrification plate is 45°~70°.

[0011] Optionally, the vertical distance between two adjacent sulfur autotrophic denitrification plates is 10-100 mm.

[0012] Optionally, the inclined plate denitrification module further includes a water distribution and rectification module provided above and below the vertical frame, wherein the water distribution and rectification module is formed by splicing two rectangular plates vertically intersecting each other, and the horizontal spacing between two adjacent rectangular plates is not greater than the horizontal spacing between two adjacent sulfur autotrophic denitrification plates.

[0013] Optionally, there are multiple inclined plate denitrification modules, which are arranged in parallel in the horizontal direction and / or vertical direction in the reaction vessel.

[0014] Optionally, the outwardly facing sides of the opposite sides of the vertical frame have matching convex and concave structures respectively.

[0015] Optionally, it also includes a water inlet unit arranged at the bottom of the reaction container and a water outlet unit arranged at the top of the reaction container, the water inlet unit includes a water inlet main pipe and a plurality of evenly distributed water inlet branches perpendicular to the water inlet main pipe, the water inlet main pipe and the water inlet branches are in the same horizontal plane, the water inlet branches are perforated pipes, and the orifices are vertically downward.

[0016] Optionally, the water inlet unit further comprises a coagulant dosing pipe which is arranged outside the reaction container and merged into the water inlet main pipe at the inlet of the water inlet main pipe.

[0017] Optionally, an air backwash unit is further included below the water inlet unit, the air backwash unit including an air backwash main pipe and a plurality of evenly distributed air backwash branch pipes perpendicular to the air backwash main pipe, the air backwash main pipe and the air backwash branch pipes are in the same horizontal plane, the air backwash branch pipes are perforated pipes, and the orifices are vertically downward.

[0018] Optionally, a mud discharge unit is further included, which includes a mud discharge main pipe and multiple mud discharge branches. The bottom of the reaction container is also provided with multiple mud discharge buckets that are wider at the top and narrower at the bottom. Each mud bucket is connected to the mud discharge main pipe through one or more mud discharge branches.

[0019] In summary, this application has at least one of the following beneficial effects: 1. In this application, the sulfur autotrophic denitrification plates are tilted and arranged in the reaction vessel. At the same time, the sulfur autotrophic denitrification plates are parallel to each other with a certain gap, which can serve as water flow channels. At the same time, the nitrogen generated by the denitrification and denitrification reaction will be quickly discharged in the unobstructed water flow channel without accumulation, so there will be no "air blockage" problem; the entire system only has local head loss in the water distribution and deflection areas, and the total head loss of the system can be controlled at about 0.5m.

[0020] 2. The present application makes the sulfur-containing material into a plate shape and arranges and combines them in a modular manner, so that the entire reaction vessel can be filled. There is no height restriction and no vacant area. Moreover, the sulfur autotrophic denitrification and denitrification system of the present application can also be used as a coagulation sedimentation tank simultaneously, creating a larger inclined plate sedimentation area, so there is no need to build an additional coagulation sedimentation tank, which greatly saves space.

[0021] 3. The sulfur autotrophic denitrification and denitrification system provided in this application does not require air-water combined backwashing, but only requires air backwashing, which saves a large number of electro-pneumatic valve components and reduces operating energy consumption; in addition, the system can be backwashed without stopping, which improves operating efficiency and reduces design redundancy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an overall schematic diagram of the sulfur autotrophic denitrification system of an embodiment of the present application; Figure 2 yes Figure 1 Schematic diagram of the structure of the inclined plate denitrification module of the sulfur autotrophic denitrification system shown; Figure 3 Schematic diagram of two inclined plate denitrification modules stacked in the vertical direction.

[0023] In the figure: 1. reaction vessel; 2. water outlet unit; 3. sludge discharge hopper; 4. water inlet unit; 41. water inlet main pipe; 42. water inlet branch pipe; 43. coagulant dosing pipe; 5. air backwash unit; 51. air backwash main pipe; 52. air backwash branch pipe; 6. sludge discharge unit; 61. sludge discharge main pipe; 62. sludge discharge branch pipe; 7. inclined plate denitrification module; 71. water distribution rectifier module; 72. sulfur autotrophic denitrification plate; 73. convex vertical frame; 74. concave vertical frame. DETAILED DESCRIPTION

[0024] Figure 1 This is a schematic diagram of the overall sulfur autotrophic denitrification system of the embodiment of the present application. Figure 1 The sulfur autotrophic denitrification system generally includes: a reaction vessel 1, an inclined plate denitrification module 7, a water inlet unit 4, a water outlet unit 2, a gas backwash unit 5, and a sludge discharge unit 6. The reaction vessel 1, serving as the main body of the sulfur autotrophic denitrification system, can be a rectangular parallelepiped or cylindrical shape, depending on the specific layout of the application scenario. The reaction vessel 1 can be made of reinforced concrete, steel, or fiberglass. The inclined plate denitrification module 7, serving as the denitrification functional component, is placed within the reaction vessel 1.

[0025] like Figure 1 As shown, the water inlet unit 4 is located at the bottom of the reaction vessel 1, and the water outlet unit 2 is located at the top of the reaction vessel 1. The water inlet unit 4 is used to introduce raw water to be treated into the reaction vessel 1. The raw water then flows into the bottom of the sulfur autotrophic denitrification module and flows out of the top. The water outlet unit 2 is used to collect the treated tail water and ultimately discharge it from the system. The water inlet unit 4 includes a water inlet main pipe 41 and multiple evenly distributed water inlet branches 42 perpendicular to the water inlet main pipe 41. The water inlet main pipe 41 and the water inlet branches 42 are on the same horizontal plane, thus forming a uniformly distributed water inlet structure at the bottom of the reaction vessel 1, ensuring that the raw water is evenly distributed at the bottom of the reaction vessel 1.

[0026] The water inlet branch pipe 42 adopts the design of perforated pipe for uniform water distribution, and the orifice is vertically downward. In order to avoid clogging of the water inlet hole, the opening rate is set to 0.5%~2%. The opening rate can be selected according to the amount of suspended solids in the raw water and the amount of denitrification. Figure 1As shown, the water inlet unit 4 also includes a coagulant addition pipe 43, which is connected to the water inlet main pipe 41 from the inlet of the water inlet main pipe 41 outside the reaction vessel 1. The coagulant addition pipe 43 can be used to add coagulant when the raw water enters the reaction vessel 1, so that the raw water can be coagulated and precipitated in the reaction vessel 1, without the need to build an additional coagulation sedimentation tank, thereby greatly saving investment and land.

[0027] See also Figure 1 The sludge discharge unit 6 is located at the bottom of the reaction vessel 1 and is used to store and compress the settled sludge. The sludge discharge unit 6 includes a main sludge discharge pipe 61 and multiple branch sludge discharge pipes 62. The bottom of the reaction vessel 1 is also provided with multiple sludge discharge hoppers 3, which are wide at the top and narrow at the bottom. Each sludge discharge hopper 3 is connected to the main sludge discharge pipe 61 via one or more branch sludge discharge pipes 62. The sludge discharge hoppers 3 are trapezoidal in shape, and their volume can be specifically set according to the amount of sludge retained and accumulated by the system.

[0028] The movement direction of the sludge generated by the system is opposite to the movement direction of the water flow. It slides freely downward from top to bottom through the inclined plate denitrification module 7, and slides to the bottom of the reaction vessel 1 together with the suspended matter and aged biofilm intercepted by the inclined plate denitrification module 7. After being collected by the sludge discharge hopper 3, it is merged into the sludge discharge main pipe 61 through the sludge discharge branch pipe 62 and discharged from the reaction vessel 1 by static pressure or pump suction.

[0029] See also Figure 1 The air backwash unit 5 is arranged below the water inlet unit 4, which can effectively clean the water distribution hole of the water inlet branch pipe 42. The air backwash unit 5 includes an air backwash main pipe 51 and a plurality of evenly distributed air backwash branches 52 perpendicular to the air backwash main pipe 51. The air backwash main pipe 51 and the air backwash branch pipes 52 are in the same horizontal plane. The air backwash main pipe 51 is externally connected to compressed air, and the air backwash branch pipes 52 adopt a perforated pipe design for uniform air distribution, and the orifice is vertically downward. To ensure the uniformity of air distribution, the air flow rate at the orifice is not less than 15m / s. The air backwash unit 5 introduces compressed air to perform air scrubbing on the inclined plate denitrification module 7, which can accelerate the shedding of suspended matter and aged biofilm.

[0030] Figure 2 yes Figure 1 The schematic diagram of the structure of the inclined plate denitrification module 7 of the sulfur autotrophic denitrification system is shown. Figure 2 The inclined plate denitrification module 7 includes a vertical frame and a plurality of sulfur autotrophic denitrification plates 72 arranged parallel to each other and inclined in the vertical frame. The sulfur autotrophic denitrification plates 72 are rectangular parallelepiped, and the area of ​​a single sulfur autotrophic denitrification plate 72 is not greater than 1.2m 2, with a thickness of 6-12mm. The sulfur autotrophic denitrification plates 72 are installed at an inclination angle of 45°-70°, and the vertical distance between two adjacent sulfur autotrophic denitrification plates 72 is 10-100mm. The specific value can be designed based on the denitrification capacity and sludge settling volume. The inclined plate denitrification module 7 not only provides sulfur-containing substances and other electron donors for sulfur autotrophic denitrification, but also serves as a microbial habitat. Furthermore, the plate-like structure enables the construction of a sedimentation tank that adheres to the "shallow pond theory," eliminating the need for coagulation and sedimentation units used in traditional technologies.

[0031] The sulfur autotrophic denitrification plate 72 is made of elemental sulfur powder, alkalinity substance powder, sulfur-containing mineral powder and adhesive as raw materials, and is manufactured by a dry plate making method.

[0032] The raw materials for the sulfur autotrophic denitrification plates 72, calculated by weight, include: 50-60% elemental sulfur powder, 10-20% alkalinity powder, 20-30% sulfur-containing mineral powder, and 5-10% binder. The alkalinity powder can be calcium carbonate or sodium bicarbonate; the sulfur-containing mineral powder can be pyrite, pyrrhotite, siderite, etc.; and the binder can be an alkali metal such as calcium oxide or manganese oxide.

[0033] Existing sulfur autotrophic granular filter media are typically prepared by heating solid sulfur to above 100°C until it completely melts. Sulfur-containing minerals, iron-containing minerals, alkalinity substances, and inorganic salts are then mixed into the molten liquid stream, followed by natural cooling or water bath cooling. This material synthesis method results in high hardness but significantly increased brittleness. Furthermore, the sulfur surface becomes passivated after melting and cooling, resulting in low reactivity. However, the granular filter material's form provides sufficient contact area with the sewage, which can mask this disadvantage. However, if this method is still used for plate production, the plate-like structure has a smaller contact area with the sewage than that obtained with granular filter material. Therefore, the sulfur autotrophic denitrification plate 72 produced in this manner still suffers from the drawback of low reactivity. Furthermore, the solid sulfur in the granular filter material shrinks by approximately 10% after melting and then cooling. If this method is still used for plate production, it can easily cause the plate to crack, affecting its integrity.

[0034] Based on this, the applicant has improved the preparation method of the sulfur autotrophic denitrification plate 72, abandoning the traditional preparation method of melting first and then cooling, and instead adopting appropriate heating and dry hydraulic methods to make the plate. Specifically, the sulfur autotrophic denitrification plate 72 is made using the following preparation method: Step S1: mixing and ball-milling elemental sulfur powder particles, basic substance powder, sulfur-containing mineral powder and a binder in a certain mass ratio to obtain mixed powder particles of 300 mesh; Step S2: adding 5% to 10% water by weight to the mixed powder particles, and spreading the mixed powder particles into a heat-insulating dry powder hydraulic mold with a spreading coefficient of 1.2 to 1.8. A grid of reinforcing ribs or reinforcing plates are arranged in the dry powder hydraulic mold, and the mold is heated to 85 to 95° C. and maintained at a constant temperature until the mixed material is slightly softened. The grid of reinforcing ribs or reinforcing plates can be made of nylon, stainless steel, fiberglass, or other materials. Step S3: using a vertical dry powder hydraulic press to press the plate, with a hydraulic pressure of 3.0-5.0 MPa, maintaining constant temperature and pressure for 5 minutes, and then naturally cooling to room temperature; Step S4: placing the regular plate obtained in the above step into a hot air drying oven for air drying, with the air temperature at 60° C. and the air drying time being 3 to 4 hours.

[0035] During the preparation of the sulfur autotrophic denitrification plate 72, the present application controls the heating temperature of the material to no more than 95°C. This temperature has not yet reached the melting point of elemental sulfur powder, so the mixed material only reaches a softened state, retaining the original crystal form of the elemental sulfur powder and having a large specific surface area. At the same time, the adhesive can react with the surface oxide layer of the elemental sulfur powder to form sulfate, thereby enhancing the bonding force between particles and between particles and reinforcing ribs or reinforcing plates, effectively reducing the brittleness of the sulfur autotrophic denitrification plate 72 and improving the denitrification biological reaction activity. At the same time, the present application manufactures the plate by dry compression molding, with a grid-like reinforcing rib or reinforcing plate in the middle of the plate as a skeleton support, which greatly reduces the shrinkage of the plate during the production process, ensures the integrity of the sulfur autotrophic denitrification plate 72, and ensures the strength requirements required for the 45°~70° tilt arrangement in engineering applications.

[0036] like Figure 2 As shown, the inclined plate denitrification module 7 also includes water distribution and rectification modules 71, located above and below the vertical frame. These modules are used to address water distribution and outlet turbulence issues within the inclined plate denitrification module 7. These modules are constructed from two perpendicular, intersecting stainless steel rectangular plates. The horizontal spacing between adjacent rectangular plates is no greater than the horizontal spacing between adjacent sulfur autotrophic denitrification plates 72. The vertical height of the modules is 100-200 mm.

[0037] The vertical frame is a support frame composed of two convex vertical frames 73 and two concave vertical frames 74 , so the vertical frame can be constructed into a support system for the inclined plate denitrification module 7 .

[0038] In a general embodiment of the present application, the number of inclined plate denitrification modules 7 is set to multiple, which can be stacked in the vertical direction or arranged side by side in the horizontal direction, or arranged in a matrix in both the vertical and horizontal directions.

[0039] like Figure 2As shown, each set of opposite sides of the vertical frame comprises a convex vertical frame 73 and a concave vertical frame 74. The convex vertical frame 73 has a convex structure facing outward, and the concave vertical frame 74 has a concave structure facing outward, so that the outward side surfaces of the opposite sides of the vertical frame respectively have a convex structure and a concave structure, and the convex structure and the concave structure are adapted to each other and can be inserted and slid into each other from the ends of the two. The convex structure can be embedded in the concave structure to form a whole.

[0040] When multiple inclined plate denitrification modules 7 are arranged side by side horizontally, the convex vertical frame 73 of one adjacent inclined plate denitrification module 7 is in close proximity to the concave vertical frame 74 of the other. Therefore, the vertical frames ensure that the multiple inclined plate denitrification modules 7 arranged side by side on the same layer form a single unit through insertion, thus preventing horizontal displacement of the inclined plate denitrification modules 7 caused by vibrations caused by air backwashing.

[0041] In a preferred example, the inner concave surface of the concave vertical frame 74 is provided with a sealing rubber strip, which can achieve the purpose of flexible shock absorption and prevent the sulfur autotrophic denitrification plate 72 from breaking due to vibration.

[0042] Figure 3 Schematic diagram of two inclined plate denitrification modules 7 stacked in the vertical direction. Figure 3 As shown, when two inclined plate denitrification modules 7 are stacked in the vertical direction, the inclination directions of the sulfur autotrophic denitrification plates 72 in the two inclined plate denitrification modules 7 are opposite. This can guide the water flow from bottom to top to present an "S"-shaped flow state, which not only helps to fully mix the coagulant added to the raw water, but also helps to fully contact the raw water with the sulfur autotrophic denitrification plates 72 for denitrification. In the inclined plate denitrification module 7 of the next layer, part of the water flow will escape upward from the gap between the two adjacent sulfur autotrophic denitrification plates 72 without fully contacting the sulfur autotrophic denitrification plates 72. When it encounters the inclined plate denitrification module 7 of the upper layer, the direction of the water flow changes, and this part of the water flow that has not fully contacted the sulfur autotrophic denitrification plates 72 of the next layer can fully contact the sulfur autotrophic denitrification plates 72 of the upper layer, thereby improving the denitrification efficiency. Moreover, this can also help flush out the suspended matter settled on the sulfur autotrophic denitrification plate 72 and the aged biofilm grown, thereby assisting in cleaning the sulfur autotrophic denitrification plate 72 and maintaining the activity of the sulfur autotrophic denitrification plate 72 .

[0043] In the solution of the present application, the sulfur autotrophic denitrification plate 72 is a consumable. The consumption of the sulfur autotrophic denitrification plate 72 can be evaluated by monitoring the total nitrogen index of the reactor inlet and outlet water. In addition, the plate can be hoisted and weighed by a crane, and the weight reduction can be evaluated. An ultrasonic ranging device can also be installed in the reaction vessel 1 to measure the change in the thickness of the sulfur autotrophic denitrification plate 72 for evaluation.

[0044] When the sulfur autotrophic denitrification plate 72 needs to be replaced, it is only necessary to hoist out the inclined plate denitrification modules 7 one by one, replace the sulfur autotrophic denitrification plate 72, and then hoist it back into the reaction vessel 1; the replaced sulfur autotrophic denitrification plate 72, the reinforcing rib net or the reinforcing plate still has some sulfur autotrophic mixed material remaining, which can be naturally air-dried or hot-air-dried during the secondary utilization process to reduce the moisture content to below 10%, and then put into the molding die to add the mixed material and press again.

[0045] The sulfur autotrophic denitrification and denitrification system of the present application will be further described below with reference to specific implementation cases.

[0046] The tertiary treatment section of a municipal wastewater treatment plant generally requires a reduction in total phosphorus from 1.0 mg / L to 0.3 mg / L and total nitrogen from 20 mg / L to 10 mg / L. The typical process flow is a "coagulation and sedimentation tank followed by a sulfur autotrophic denitrification filter." This article provides a detailed explanation using a comparison of the tertiary treatment section of a 20,000-ton municipal wastewater treatment plant in a specific region before and after renovation.

[0047] The tertiary treatment process before the renovation consisted of a high-efficiency sedimentation tank (sludge return coagulation sedimentation tank) + a sulfur autotrophic denitrification filter. The high-efficiency sedimentation tank had a floor area of ​​19.6m x 17m and a head loss of 0.5m. The sulfur autotrophic denitrification filter had a floor area of ​​27.67m x 18.7m (including the clear water tank and wastewater tank), a total height of 6m, and a head loss of 2.45m. The tank was filled with 1-6mm spherical sulfur autotrophic filter media at a height of 2.2m. The treated water volume was 20,000m3. 3 / day, the inlet water quality is: TN≤20mg / L, TP≤1.0mg / L, SS≤20mg / L, and the outlet water quality is: TN≤10mg / L, TP≤0.3mg / L, SS≤10mg / L.

[0048] After the transformation, the process flow of the three-stage treatment section was reduced from two sections to one. The specific construction form can be found in Figure 1 , eliminating the need for a coagulation sedimentation tank. The reaction vessel 1 covers an area of ​​18.27×13.60m, the total height of the tank is 6m, and the head loss is 0.5m; the number of stacked layers of the inclined plate denitrification module 7 is 5, and the thickness of the sulfur autotrophic denitrification plate 72 in each inclined plate denitrification module 7 is 10mm, and the area of ​​a single plate is 0.6m 2 The installation angle is 60°, and the vertical distance between the plates is 20mm. During the preparation of each sulfur autotrophic denitrification plate 72, the weight of elemental sulfur powder particles accounts for 60%, the weight of the alkalinity substance powder is sodium bicarbonate, the weight of the alkalinity substance powder is 10%, the weight of the sulfur-containing mineral powder is pyrite, the weight of the sulfur-containing mineral powder is 20%, the weight of the binder is manganese oxide, the weight of the mixed material is 1.5, and the hydraulic pressure is 5.0MPa. The water treatment capacity is 20000m 3 / day, the inlet water quality is: TN≤20mg / L, TP≤1.0mg / L, SS≤20mg / L, and the outlet water quality is: TN≤6mg / L, TP≤0.15mg / L, SS≤8mg / L.

[0049] Comprehensive comparative analysis shows that the effluent water quality of the sulfur autotrophic denitrification denitrification system provided in this application can meet the water quality requirements of the tertiary treatment of urban sewage treatment plants. In addition, the land area is only 29.21% of the original design scheme, and the total head loss is reduced by about 2.45 meters, which is only 16.95% of the original design.

[0050] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A sulfur autotrophic denitrification plate for a sulfur autotrophic denitrification system, characterized in that: The sulfur autotrophic denitrification plate (72) is made into a plate-shaped structure by a dry plate making method, and comprises the following raw materials by weight percentage: elemental sulfur powder 50-60%, alkalinity substance powder 10-20%, sulfur-containing mineral powder 20-30%, and adhesive 5-10%.

2. A sulfur autotrophic denitrification system having the sulfur autotrophic denitrification plate according to claim 1, characterized in that: include: A reaction vessel (1) and an inclined plate denitrification module (7) filled in the reaction vessel (1), wherein the inclined plate denitrification module (7) comprises a vertical frame and a plurality of sulfur autotrophic denitrification plates (72) arranged parallel to each other and inclined in the vertical frame, wherein the area of ​​the sulfur autotrophic denitrification plates (72) is not greater than 1.2 m 2 , thickness is 6~12mm.

3. The sulfur autotrophic denitrification system according to claim 2, characterized in that: The inclination angle of the sulfur autotrophic denitrification plate (72) is 45° to 70°.

4. The sulfur autotrophic denitrification and denitrification system according to claim 2, characterized in that: The vertical distance between two adjacent sulfur autotrophic denitrification plates (72) is 10-100 mm.

5. The sulfur autotrophic denitrification and denitrification system according to claim 2, characterized in that: The inclined plate denitrification module (7) further comprises water distribution and rectification modules (71) arranged above and below the vertical frame, wherein the water distribution and rectification modules (71) are formed by splicing two rectangular plates vertically intersecting each other, and the horizontal spacing between two adjacent rectangular plates is no greater than the horizontal spacing between two adjacent sulfur autotrophic denitrification plates (72).

6. The sulfur autotrophic denitrification and denitrification system according to claim 2, characterized in that: There are multiple inclined plate denitrification modules (7), which are arranged in parallel in the horizontal direction and / or vertical direction in the reaction container (1).

7. The sulfur autotrophic denitrification and denitrification system according to claim 2, characterized in that: The invention also comprises a water inlet unit (4) arranged at the bottom of the reaction container (1) and a water outlet unit (2) arranged at the top of the reaction container (1); the water inlet unit (4) comprises a water inlet main pipe (41) and a plurality of evenly distributed water inlet branch pipes (42) perpendicular to the water inlet main pipe (41); the water inlet main pipe (41) and the water inlet branch pipes (42) are located at the same horizontal plane; the water inlet branch pipes (42) are perforated pipes with their openings facing vertically downward.

8. The sulfur autotrophic denitrification system according to claim 7, characterized in that: The water inlet unit (4) further comprises a coagulant dosing pipe (43) which is arranged outside the reaction container (1) and is merged into the water inlet main pipe (41) at the inlet of the water inlet main pipe (41).

9. The sulfur autotrophic denitrification and denitrification system according to claim 7, characterized in that: The invention also includes an air backwash unit (5) provided below the water inlet unit (4), wherein the air backwash unit (5) includes an air backwash main pipe (51) and a plurality of evenly distributed air backwash branch pipes (52) perpendicular to the air backwash main pipe (51), wherein the air backwash main pipe (51) and the air backwash branch pipes (52) are located at the same horizontal plane, and the air backwash branch pipes (52) are perforated pipes with their openings facing vertically downward.

10. The sulfur autotrophic denitrification system according to any one of claims 2 to 9, characterized in that: The invention also comprises a mud discharge unit (6), wherein the mud discharge unit (6) comprises a mud discharge main pipe (61) and a plurality of mud discharge branch pipes (62). The bottom of the reaction container (1) is also provided with a plurality of mud discharge buckets (3) which are wide at the top and narrow at the bottom. Each mud bucket (3) is connected to the mud discharge main pipe (61) via one or more mud discharge branch pipes (62).

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