Integrated treatment system of MBBR coupled with multi-stage AO

Abstract

The present application relates to a kind of MBBR coupling multistage AO integrated processing system, including the anaerobic pool, first anoxic MBBR pool, first transition treatment pool, aerobic MBBR pool, second transition treatment pool, second anoxic MBBR pool and third transition treatment pool connected in sequence;First anoxic MBBR pool, aerobic MBBR pool, second anoxic MBBR pool are all provided with MBBR filler, and the inside of the three pool bodies is equipped with two arc-shaped guide plates, the outside of guide plate is protruding towards the side wall of adjacent pool body, the inside of guide plate is recessed and faces the filler in pool, avoid the accumulation of filler in the corner of pool body;First transition treatment pool, second transition treatment pool and third transition treatment pool are all provided with first aeration device, provide required oxygen for each pool body;First anoxic MBBR pool, aerobic MBBR pool, second anoxic MBBR pool are all provided with second aeration device, provide aeration and promote the movement of filler for each pool body.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically relating to an integrated treatment system of MBBR coupled with multi-stage AO. Background Technology

[0002] AO and AAO processes are commonly used biological treatment methods for industrial and domestic wastewater, achieving simultaneous nitrogen removal. However, they suffer from drawbacks such as poor load resistance, long hydraulic retention time, and inability to enrich functional microorganisms. Moving bed biofilm reactors (MBBRs) are completely mixed and continuously operating biofilm reactors with a packing density close to that of water. They utilize aeration to provide a three-phase (gas, liquid, and solid) growth environment for microorganisms, combining the advantages of traditional fluidized bed and biological contact oxidation methods. By integrating biofilm with activated sludge, they form suspended activated sludge and attached biofilm, offering the high efficiency and flexible operation of activated sludge processes while retaining the shock load resistance, long sludge age, and low residual sludge volume of traditional biofilm methods. Simultaneously, they enable the enrichment, enhancement, and regulation of functional microorganisms.

[0003] However, the MBBR technology still faces several challenges in its application: clogging of the filter screen and unbalanced aeration affect the effectiveness of the MBBR process. After adding MBBR packing material to the aeration zone of the biological reactor, sufficient stirring power is required to maintain the packing material's suspension. This necessitates aeration devices with large bubbles, which have different air diffusion resistance than the original microporous aerators. Furthermore, the different specific surface areas of large and microbubbles result in varying oxygen transfer efficiencies, leading to excessive energy consumption by the aeration equipment. This is particularly problematic in heavily polluted water, making it difficult to maintain the oxygen-rich environment required for nitrification, resulting in excessive ammonia nitrogen levels in the effluent. Additionally, the MBBR packing filter screen is arranged perpendicular to the water flow direction, causing packing material to accumulate and clog at the screen. In severe cases, the filter screen may be damaged, leading to packing material escape and disrupting the normal operation of the MBBR and subsequent processes. Summary of the Invention

[0004] To address the above problems, this invention provides an integrated treatment system for MBBR coupled with multi-stage AO, comprising an anaerobic tank, a first anoxic MBBR tank, a first transition treatment tank, an aerobic MBBR tank, a second transition treatment tank, a second anoxic MBBR tank, and a third transition treatment tank connected in sequence.

[0005] MBBR packing material is installed in the first anoxic MBBR tank, the aerobic MBBR tank, and the second anoxic MBBR tank. Each of these three tanks has two arc-shaped guide plates inside. The outer side of the guide plate protrudes towards the adjacent tank sidewall, while the inner side of the guide plate is concave and faces the packing material inside the tank, to prevent the packing material from accumulating in the corners of the tank.

[0006] The first, second, and third transition treatment tanks are each equipped with a first aeration device to provide the required oxygen to each tank; the first anoxic MBBR tank, the aerobic MBBR tank, and the second anoxic MBBR tank are each equipped with a second aeration device to provide aeration to each tank and to move the packing material.

[0007] Optionally, the first anoxic MBBR tank is rectangular, with an arc-shaped guide plate 1 and a guide plate 2 respectively located near the two wide sides. A baffle 1 is provided between the guide plate 1 and the guide plate 2. The baffle 1 is parallel to the length direction of the first anoxic MBBR tank and is used to divide the first anoxic MBBR tank into an upstream zone 1 and a downstream zone 1 with the same width.

[0008] The outlet of the first water pipe passes through the guide plate and flows directly into the upstream zone, so that the water and packing material pass through the upstream zone and downstream zone one in sequence along the length of the first anoxic MBBR tank.

[0009] Further optionally, the first guide plate, the second guide plate, and the first baffle are all vertically arranged and are all higher than the liquid level of the first anoxic MBBR tank; the bottom of the first guide plate and the second guide plate are in contact with the bottom surface of the first anoxic MBBR tank; and there is space between both ends of the first baffle and the inner surfaces of the first guide plate and the second guide plate to allow the packing material to flow through.

[0010] The first guide plate includes a solid plate in the middle and mesh plates on both sides. The mesh plates on both sides are connected to the two long sides of the first anoxic MBBR tank. The second guide plate has the same structure as the first guide plate. The mesh plates on both sides of the first and second guide plates have uniform density through holes, which allow water to pass through while trapping the packing material, so that the packing material circulates along the length of the first anoxic MBBR tank in the upstream zone 1 and the downstream zone 1.

[0011] Further optionally, the bottom of the first anoxic MBBR tank is equipped with several submersible agitators to prevent the packing material from sinking and settling; second aeration devices are evenly distributed on both sides of the baffle to provide a micro-oxygen environment for the upstream zone and the downstream zone, respectively.

[0012] Optionally, a second water pipe is provided at the top of the long side of the downstream area, the second water pipe is located outside the guide plate and is opposite to the first water pipe; a filter screen is provided at the second water pipe.

[0013] Preferably, the outlet end of the first water pipe extends beyond the space between the first guide plate and the first baffle, and is located between the side of the first baffle and the long side of the upstream area.

[0014] Optionally, the upstream side of the first transition treatment tank is connected to a second water pipe, and a baffle is provided in the first transition treatment tank to divide the first transition treatment tank into anoxic zone one and aerobic zone one. The bottom of the downstream end of aerobic zone one is connected to an aerobic MBBR tank through a third water pipe.

[0015] The present invention also provides two novel packing materials for use in different MBBR tanks. The first type of packing material is a rotating packing material, which includes a main frame and two nested inner and outer load parts. The main frame is a hollow circle, and the outer load part includes several triangular outer load pieces. The outer load pieces are curved and protrude outward from the rotating packing material. The bottom edge of the outer load pieces is connected to the main frame, and the outer load pieces cover the spherical surface of the sphere in which the main frame is located.

[0016] A fixed axis is provided at two opposite positions on the inner sidewall of the main frame. The fixed axis protrudes into the main frame. An inner frame is provided inside the main frame. The inner frame is a hollow circle. The inner frame is rotatably connected to the two fixed axes. The straight line where the two fixed axes are located is the central axis of the inner frame. The inner frame can rotate about the central axis.

[0017] The inner load section includes several triangular inner load pieces. The inner load pieces are curved and protrude outwards towards the outer load pieces. The bottom edge of the inner load pieces is connected to the inner frame, and the inner load pieces cover the spherical surface of the sphere on which the inner frame is located.

[0018] The second type of packing is asymmetric packing. Asymmetric packing includes a head sphere, a frustum, and a tail sphere connected in sequence. The frustum is a hollow frustum. The head sphere includes a head frame and several triangular head load plates. The tail sphere includes a tail frame and several triangular tail load plates. Both the head frame and the tail frame are hollow circles. The diameter of the head frame is larger than the diameter of the tail frame.

[0019] One side edge of the head frame connects to the bottom edge of the head load piece, and the other side edge connects to the small diameter end of the frustum. One side edge of the tail frame connects to the bottom edge of the tail load piece, and the other side edge connects to the large diameter end of the frustum.

[0020] Optionally, the rotating packing, asymmetric packing, and ordinary packing have the same volume, and the rotating packing, asymmetric packing, and ordinary packing are placed in the aerobic MBBR tank, with the volume ratio of the three being (3-5):(0.5-1):1.

[0021] The rotating packing material, asymmetric packing material, and ordinary packing material are placed in the first anoxic MBBR tank, and the volume ratio of the three materials is (1-2):(0.2-0.6):1.

[0022] The rotating packing material, asymmetric packing material, and ordinary packing material are placed in the second anoxic MBBR tank, and the volume ratio of the three is (2-3):(0.5-0.8):1.

[0023] The inventors discovered that by adding different proportions of rotating packing, asymmetric packing, and ordinary packing in different MBBR tanks, it is possible to reduce energy consumption and improve treatment efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the integrated processing system of MBBR coupled with multi-level AO;

[0025] Figure 2 This is a schematic diagram of the first anoxic MBBR tank;

[0026] Figure 3 A schematic diagram of rotating packing (I);

[0027] Figure 4 Schematic diagram of rotating packing (II);

[0028] Figure 5 This is a schematic diagram of asymmetric packing material.

[0029] Figure 6 This is a schematic diagram of the inner core.

[0030] In the attached diagram, 1-anaerobic tank, 2-first anoxic MBBR tank, 3-first transition treatment tank, 4-aerobic MBBR tank, 5-second transition treatment tank, 6-second anoxic MBBR tank, 7-third transition treatment tank, 8-frustum section, 9-inlet pipe, 10-first overflow pipe, 11-second overflow pipe, 12-guide plate one, 13-guide plate two, 14-baffle one, 15-upstream zone one, 16-downstream zone one, 17-inner core, 18-crossbeam, 19-anoxic zone one, 20-aerobic zone one, 21-anoxic zone two, 22-aerobic zone two, 23-anoxic zone three, 24-aerobic zone three, 25-main frame, 26-outer load plate, 27-inner load plate, 28-inner frame, 29-fixed shaft, 30-head frame, 31-head load plate, 32-tail frame, 33-tail load plate. Detailed Implementation

[0031] This embodiment provides an integrated processing system for MBBR coupled with multi-level AO, such as... Figures 1-6 As shown, it includes an anaerobic tank 1, a first anoxic MBBR tank 2, a first transition treatment tank 3, an aerobic MBBR tank 4, a second transition treatment tank 5, a second anoxic MBBR tank 6, and a third transition treatment tank 7 connected in sequence.

[0032] MBBR packing material is installed in the first anoxic MBBR tank 2, the aerobic MBBR tank 4, and the second anoxic MBBR tank 6. Each of these three tanks has two arc-shaped guide plates inside. The outer side of the guide plate protrudes towards the side wall of the adjacent tank, while the inner side of the guide plate is concave and faces the packing material inside the tank, to prevent the packing material from accumulating in the corners of the tank.

[0033] The first transition treatment tank 3, the second transition treatment tank 5, and the third transition treatment tank 7 are all equipped with a first aeration device to provide the required oxygen to each tank; the first anoxic MBBR tank 2, the aerobic MBBR tank 4, and the second anoxic MBBR tank 6 are all equipped with a second aeration device to provide aeration to each tank and to move the packing material.

[0034] Both the first and second aeration devices can be aeration pipes with aeration holes. The aeration hole diameters and aeration volumes of the first and second aeration devices are different and can be adjusted according to the needs of each tank.

[0035] The anaerobic tank 1 is equipped with an inlet pipe 9 on its upstream side to input sewage into the system. Anaerobic sludge is contained in the anaerobic tank 1, and after contacting and mixing with the sewage, anaerobic biochemical reaction is carried out.

[0036] The bottom of the downstream end of the anaerobic tank 1 is provided with a first water pipe 10, which is used to connect to the bottom of the first anoxic MBBR tank 2 and input the effluent from the anaerobic tank 1 into the first anoxic MBBR tank 2.

[0037] The anaerobic tank 1 is equipped with at least one baffle, which causes the water in the anaerobic tank 1 to flow in a serpentine manner along the baffle, thereby prolonging the hydraulic residence time.

[0038] Several flow promoters can be installed in the anaerobic tank 1 in the direction of water flow to promote water flow and full contact with activated sludge.

[0039] The first anoxic MBBR tank 2 is rectangular, with an arc-shaped guide plate 12 and a guide plate 23 near the two wide sides respectively. A baffle 14 is provided between the guide plate 12 and the guide plate 23. The baffle 14 is parallel to the length direction of the first anoxic MBBR tank 2 and is used to divide the first anoxic MBBR tank 2 into an upstream zone 15 and a downstream zone 16 with the same width.

[0040] The outlet of the first water pipe 10 passes through the guide plate 12 and enters the upstream zone 15, so that the water and packing material pass through the upstream zone 15 and the downstream zone 16 in sequence along the length of the first anoxic MBBR tank 2.

[0041] The first guide plate 12, the second guide plate 13, and the first baffle 14 are all vertically arranged and are all higher than the liquid level of the first anoxic MBBR tank 2; the bottom of the first guide plate 12 and the second guide plate 13 are in contact with the bottom surface of the first anoxic MBBR tank 2; there is space between both ends of the first baffle 14 and the inner surfaces of the first guide plate 12 and the second guide plate 13 to allow the packing material to flow through.

[0042] The first guide plate 12 includes a solid plate in the middle and mesh plates on both sides. The mesh plates on both sides are respectively connected to the two long sides of the first anoxic MBBR tank 2. The second guide plate 13 has the same structure as the first guide plate 12. The mesh plates on both sides of the first guide plate 12 and the second guide plate 13 have uniform density through holes, which allow water to pass through while trapping the packing material, so that the packing material circulates along the length of the first anoxic MBBR tank 2 in the upstream zone 15 and the downstream zone 16.

[0043] The bottom of the first anoxic MBBR tank 2 is equipped with several submersible agitators to prevent the packing material from sinking and settling; the two sides of the baffle 14 are evenly equipped with second aeration devices to provide a micro-oxygen environment for the upstream zone 15 and the downstream zone 16 respectively.

[0044] The top of the long side of the downstream area 16 is provided with a second water pipe 11. The second water pipe 11 is located outside the guide plate 12 and is opposite to the first water pipe 10. A filter screen is provided at the second water pipe 11.

[0045] Preferably, the outlet end of the first water pipe 10 extends beyond the space between the guide plate 12 and the baffle 14, and is located between the side of the baffle 14 and the long side of the upstream area 15.

[0046] The effluent from anaerobic tank 1 enters the upstream zone 15 of the first anoxic MBBR tank 2 through the first water pipe 10. The effluent is blocked by baffle 14 and flows along the upstream zone 15, hydraulically propelling the MBBR packing material. Microorganisms attached to the packing material mix with the water and undergo biochemical reactions. Simultaneously, the second aeration device on baffle 14 provides micro-aeration to maintain the anoxic environment in the tank. The water carries the packing material to guide plate 13, flowing and turning along the arc-shaped inner side of guide plate 13, thus flowing into the downstream zone 16. The water flow direction in the downstream zone 16 is opposite to that in the upstream zone 15. The water carries the packing material to guide plate 12, flowing and turning along the arc-shaped inner side of guide plate 12, thus flowing back into the upstream zone 15, forming a circulation of the packing material. The water in the downstream zone 16 flows through the mesh of guide plate 12, passes through the filter screen, and then flows out through the second water pipe 11 to the first transition treatment tank 3.

[0047] The upstream side of the first transition treatment tank 3 is connected to the second water pipe 11. The first transition treatment tank 3 is provided with a baffle plate, which divides the first transition treatment tank 3 into anoxic zone 19 and aerobic zone 20. The bottom of the downstream end of aerobic zone 20 is connected to the aerobic MBBR tank 4 through the third water pipe.

[0048] The first transition treatment tank 3 contains activated sludge. The effluent from the first anoxic MBBR tank 2 is in anoxic condition and enters the anoxic zone 19 for further anoxic biological treatment, while the water flows along the baffles. The bottom of the first transition treatment tank 3 is evenly covered with a first aeration device, which aerates the water according to its needs, gradually increasing the oxygen content. The water then flows to the aerobic zone 20 for aerobic biological treatment. A flow promoter can also be installed in the first transition treatment tank 3 to further promote water flow.

[0049] The aerobic MBBR tank 4 is rectangular, with arc-shaped guide plates three and four near the two wide sides respectively. A baffle two is provided between the guide plates three and four. The baffle two is parallel to the length direction of the aerobic MBBR tank 4 and is used to divide the aerobic MBBR tank 4 into an upstream zone two and a downstream zone two with the same width.

[0050] The outlet of the third water pipe passes through the guide plate three and flows directly into the upstream zone two, so that the water and packing material pass through the upstream zone two and the downstream zone two in sequence along the length of the aerobic MBBR tank 4.

[0051] The three guide plates, four guide plates, and two baffles are all vertically arranged and are all higher than the liquid surface of the aerobic MBBR tank 4; the bottom of the three guide plates and four guide plates are in contact with the bottom surface of the aerobic MBBR tank 4; there is space between both ends of the two baffles and the inner surfaces of the three guide plates and four guide plates to allow the packing material to flow through.

[0052] The flow guide plate three includes a solid plate in the middle and mesh plates on both sides. The mesh plates on both sides are connected to the two long sides of the aerobic MBBR tank 4. The flow guide plate four has the same structure as the flow guide plate three. The mesh plates on both sides of the flow guide plate three and the flow guide plate four have uniform density through holes, which allow water to pass through while trapping the packing material, so that the packing material circulates along the length of the aerobic MBBR tank 4 in the upstream zone two and the downstream zone two.

[0053] The bottom of the aerobic MBBR tank 4 is equipped with several submersible agitators to prevent the packing material from sinking and settling; the two sides of the baffle are evenly equipped with second aeration devices to provide an aerobic environment for the upstream zone 2 and the downstream zone 2, respectively.

[0054] The top of the long side of the downstream zone 2 is provided with a fourth water pipe, which is located on the outside of the guide plate 3 and is opposite to the third water pipe; a filter screen is provided at the fourth water pipe.

[0055] Preferably, the outlet end of the third water pipe extends beyond the space between the guide plate three and the baffle two, and is located between the side of the baffle two and the long side of the upstream area two.

[0056] The effluent from the first transition treatment tank 3 enters the upstream zone 2 of the aerobic MBBR tank 4 through the third water pipe. Hydraulic pressure propels the MBBR packing material, which, along with aerobic microorganisms attached to it, mixes with the water and undergoes aerobic biochemical reactions. Simultaneously, the second aeration device on baffle 2 aerates the water, releasing numerous small bubbles to provide ample oxygen for the MBBR packing material. Similar to the flow within the first anoxic MBBR tank 2, the water carries the packing material, which circulates between guide plates 3 and 4. Meanwhile, the water in the downstream zone 2 flows through the mesh of guide plate 3, passes through the filter screen, and exits through the fourth water pipe into the second transition treatment tank 5.

[0057] The upstream side of the second transition treatment tank 5 is connected to the fourth water pipe. A baffle is provided inside the second transition treatment tank 5 to divide the second transition treatment tank 5 into aerobic zone 22 and anoxic zone 21. The bottom of the downstream end of the anoxic zone 21 is connected to the second anoxic MBBR tank 6 through the fifth water pipe.

[0058] The second transition treatment tank 5 contains activated sludge. The effluent from the aerobic MBBR tank 4 is in an oxygen-rich state and enters aerobic zone 22 for further aerobic biological treatment. Simultaneously, the water flows along the baffles. The bottom of the second transition treatment tank 5 is evenly covered with a first aeration device, which provides small-scale aeration as needed. The oxygen content of the water gradually decreases, and the water flows to anoxic zone 21 for anoxic biological treatment. A flow promoter can also be installed in the second transition treatment tank 5 to promote water flow.

[0059] The second anoxic MBBR tank 6 is rectangular, with arc-shaped guide plates five and six near the two wide sides respectively. A baffle three is provided between the guide plates five and six. The baffle three is parallel to the length direction of the second anoxic MBBR tank 6 and is used to divide the second anoxic MBBR tank 6 into an upstream zone three and a downstream zone three with the same width.

[0060] The outlet of the fifth water pipe passes through the guide plate five and enters the upstream zone three directly, so that the water and packing material pass through the upstream zone three and the downstream zone three in sequence along the length of the second anoxic MBBR tank 6.

[0061] The five guide plates, six guide plates, and three baffles are all vertically arranged and are all higher than the liquid level of the second anoxic MBBR tank 6; the bottoms of the five guide plates and six guide plates are in contact with the bottom surface of the second anoxic MBBR tank 6; there is space between both ends of the baffles and the inner surfaces of the five guide plates and six guide plates to allow the packing material to flow through.

[0062] The flow guide plate five includes a solid plate in the middle and mesh plates on both sides. The mesh plates on both sides are connected to the two long sides of the second anoxic MBBR tank 6. The flow guide plate six has the same structure as the flow guide plate five. The mesh plates on both sides of the flow guide plate five and the flow guide plate six have uniform density through holes, which allow water to pass through while trapping the packing material, so that the packing material circulates along the length of the second anoxic MBBR tank 6 in the upstream zone three and the downstream zone three.

[0063] The bottom of the second anoxic MBBR tank 6 is equipped with several submersible agitators to prevent the packing material from sinking and settling; the two sides of the baffle 3 are evenly equipped with second aeration devices to provide a micro-oxygen environment for the upstream zone 3 and the downstream zone 3 respectively.

[0064] The top of the long side of the downstream zone three is provided with a sixth water pipe, which is located outside the guide plate five and is opposite to the first water pipe 10; a filter screen is provided at the sixth water pipe.

[0065] Preferably, the outlet end of the fifth water pipe extends beyond the space between the guide plate five and the baffle three, and is located between the side of the baffle three and the long side of the upstream area three.

[0066] The treatment principle, water body, and packing flow of the second anoxic MBBR tank 6 are similar to those of the first anoxic MBBR tank 2. The effluent from the second anoxic MBBR tank 6 is fed into the third transition treatment tank 7 through the sixth water pipe.

[0067] The upstream side of the third transition treatment tank 7 is connected to the sixth water pipe. A baffle is provided inside the third transition treatment tank 7 to divide the third transition treatment tank 7 into anoxic zone 3 23 and aerobic zone 3 24. The top of the downstream end of aerobic zone 3 24 is connected to the product water pipe to discharge product water.

[0068] The third transition treatment tank 7 contains activated sludge. The effluent from the second anoxic MBBR tank 6 is in anoxic condition and enters anoxic zone 23 for further anoxic biological treatment, while the water flows along the baffles. The bottom of the third transition treatment tank 7 is evenly covered with first aeration devices, which aerate according to the needs of the tank, gradually increasing the oxygen content. The water then flows to aerobic zone 24 for aerobic biological treatment, and after treatment, the permeate is discharged. A flow promoter can also be installed in the third transition treatment tank 7 to promote water flow.

[0069] This invention sequentially sets up three MBBR tanks: a first anoxic MBBR tank 2, an aerobic MBBR tank 4, and a second anoxic MBBR tank 6. Between these MBBR tanks, based on the oxygen content characteristics of each tank, a first transition treatment tank 3 and a second transition treatment tank 5 are set up. Finally, a third transition treatment tank 7 further treats residual pollutants in the water, ensuring the water meets discharge standards. Arc-shaped baffles are installed in the three MBBR tanks to prevent localized packing material accumulation, ensuring uniform distribution of the packing material within the reaction zone and improving the system's pollutant removal efficiency. Different aeration devices are used in the MBBR tanks and transition treatment tanks to meet the oxygen requirements of different tanks. The submersible mixer in the MBBR tank works in conjunction with the second aeration device to maintain the suspended flow of the packing material while meeting oxygen demands, thus improving the overall system's treatment performance. This invention's MBBR coupled with a multi-stage AO process exhibits high resistance to nitrogen shock loads, minimal impact from climate and temperature, and high nitrogen removal efficiency.

[0070] The present invention also provides two novel packing materials for use in different MBBR tanks. The first type of packing material is a rotating packing material, which includes a main frame 25 and two nested inner and outer load parts. The main frame 25 is a hollow circle, and the outer load part includes several triangular outer load pieces 26. The outer load pieces 26 have an arc and protrude outward from the rotating packing material. The bottom edge of the outer load pieces 26 is connected to the main frame 25, and the outer load pieces 26 cover the spherical surface of the sphere in which the main frame 25 is located.

[0071] A fixed shaft 29 is provided at two opposite positions on the inner sidewall of the main frame 25. The fixed shaft 29 protrudes into the main frame 25. An inner frame 28 is provided inside the main frame 25. The inner frame 28 is a hollow circle. The inner frame 28 is rotatably connected to the two fixed shafts 29. The straight line where the two fixed shafts 29 are located is the central axis of the inner frame 28. The inner frame 28 can rotate about the central axis.

[0072] The inner load portion includes several triangular inner load pieces 27. The inner load pieces 27 are curved and protrude outward toward the outer load pieces 26. The bottom edge of the inner load pieces 27 is connected to the inner frame 28, and the inner load pieces 27 cover the spherical surface of the sphere where the inner frame 28 is located.

[0073] The sphere containing the main frame 25 is defined as the outer sphere, with the center of the main frame 25 as the radius of the sphere. The sphere containing the main frame 25 is the outer sphere. The sphere containing the inner frame 28 is defined as the inner sphere, with the center of the inner frame 28 as the radius of the sphere. Both the outer and inner spheres are virtual spheres used to position the outer load piece 26 and the inner load piece 27. The outer and inner spheres are concentrically set, with the inner sphere located inside the outer sphere.

[0074] The outer spherical surfaces on both sides of the main frame 25 each have a vertex. These two vertices are aligned with the center of the outer sphere. External load plates 26 are evenly distributed on both sides of the main frame 25. The bottom edge of the external load plate 26 is connected to the edge of one side of the main frame 25, and the apex of the external load plate 26 is close to and points towards the vertex of the outer sphere.

[0075] The bottom edges of adjacent outer load plates 26 are in contact with each other, but the sides of adjacent outer load plates 26 are not in contact with each other, so that the outer load plates 26 cannot completely cover the spherical surface of the outer sphere.

[0076] The inner spheres on both sides of the inner frame 28 each have a vertex. These two vertices are aligned with the center of the inner sphere. Inner load plates 27 are evenly distributed on both sides of the inner frame 28. The bottom edge of the inner load plate 27 is connected to the edge of one side of the inner frame 28, and the top corner of the inner load plate 27 is close to and points towards the vertex of the inner sphere's surface.

[0077] The bottom edges of adjacent inner load plates 27 are in contact with each other, but the sides of adjacent inner load plates 27 are not in contact with each other, so that the inner load plates 27 cannot completely cover the spherical surface of the inner sphere.

[0078] Two fixed shafts 29 on the inner sidewall of the main frame 25 are aligned with the center of the main frame 25, forming a central axis. Two through holes are provided on the sidewall of the inner frame 28, each corresponding to one of the fixed shafts 29. The inner frame 28 can rotate within the main frame 25 around the central axis. The rotating packing material of this invention increases the inner frame 28, thus increasing the load area. The inner frame 28 can rotate, forming two independent load areas with the main frame 25, which do not affect each other. Microorganisms are loaded on the outer load plate 26 of the main frame 25. The area near the apex of the outer sphere pointed to by the apex of the outer load plate 26 is empty, allowing external air to enter the inner frame 28 through the space at the apex of the outer sphere. Microorganisms can also be loaded on the inner load plate 27 of the inner frame 28. Protected by the outer load plate 26, the microbial film on the inner load plate 27 grows better, thereby improving wastewater treatment efficiency. The rotatable inner frame 28 not only improves the contact between sewage and microorganisms, but also makes the water flow inside the packing more complex, thereby driving the rotating packing to rotate and roll, reducing the energy demand of the submersible mixer and reducing energy consumption.

[0079] The second type of packing is asymmetric packing. Asymmetric packing includes a head sphere, a frustum 8 and a tail sphere connected in sequence. The frustum 8 is a hollow frustum shape. The head sphere includes a head frame 30 and several triangular head load plates 31. The tail sphere includes a tail frame 32 and several triangular tail load plates 33. The head frame 30 and the tail frame 32 are both hollow circles. The diameter of the head frame 30 is larger than the diameter of the tail frame 32.

[0080] One side edge of the head frame 30 is connected to the bottom edge of the head load plate 31, and the other side edge is connected to the small diameter end of the frustum portion 8. One side edge of the tail frame 32 is connected to the bottom edge of the tail load plate 33, and the other side edge is connected to the large diameter end of the frustum portion 8.

[0081] The sphere containing the head frame 30 is defined as follows: the center of the head frame 30 is the center of the sphere, and the radius of the head frame 30 is the radius of the sphere. The sphere containing the head frame 30 is called the head sphere. The sphere containing the tail frame 32 is defined as follows: the center of the tail frame 32 is the center of the sphere, and the radius of the tail frame 32 is the radius of the sphere. The sphere containing the tail frame 32 is called the tail sphere. Both the head sphere and the tail sphere are virtual spheres, serving to position the head load piece 31 and the tail load piece 33. The center of the head frame 30 and the center of the tail frame 32 are on the same straight line as the central axis of the frustum 8.

[0082] The apex of the head load plate 31 is close to and points to the vertex of the spherical surface of the head sphere. The bottom edges of adjacent head load plates 31 are in contact with each other, but the sides of adjacent head load plates 31 are not in contact with each other, so that the head load plate 31 cannot completely cover the hemisphere of the head sphere.

[0083] The apex of the tail load plate 33 is close to and points towards the apex of the tail sphere. The bottom edges of adjacent tail load plates 33 are in contact with each other, but the sides of adjacent tail load plates 33 are not in contact with each other, so that the tail load plate 33 cannot completely cover the hemisphere of the tail sphere.

[0084] The frustum portion 8 has at least one inner core 17 inside, and the inner core 17 includes several crossbeams 18. One end of the crossbeam 18 is connected to the inner wall of the frustum portion 8, and the other end is connected to the central axis of the frustum portion 8. The length of the crossbeam 18 is the radius of the frustum portion 8. Several crossbeams 18 are evenly distributed radially on the cross section of the frustum portion 8, and there are gaps between adjacent crossbeams 18.

[0085] Several perforated strips are evenly arranged on the side wall of the frustum 8, but no perforated strips are arranged at the position where the crossbeam 18 connects to the inner wall of the frustum 8.

[0086] The asymmetric packing material features a dumbbell-shaped design, with one end larger than the other. The head sphere, tail sphere, and frustum section 8 can all support microorganisms, providing a large loading area and thus increasing biomass. After being loaded with microorganisms, the weight of the tail sphere is greater than that of the head sphere. As it flows with the water, the tail sphere tends to rotate downwards. Simultaneously, other packing materials touch the asymmetric packing material, causing it to constantly adjust its posture in the water flow. This continuous rotation and contact with surrounding packing materials further promotes rotation and rolling, improving contact between the packing material and the wastewater, increasing water turbulence, reducing the energy demand on the submersible mixer, and lowering energy consumption.

[0087] In the following embodiments, the wastewater treatment capacity of the integrated treatment system is 50 tons / day, and the wastewater quality is COD: 632-700 mg / L, ammonia nitrogen: 36-50 mg / L, and total nitrogen: 48-60 mg / L; the dissolved oxygen in each aerobic zone and aerobic MBBR tank is controlled at around 2.0 mg / L, and the dissolved oxygen in each anoxic zone and two anoxic MBBR tanks is controlled at around 0.5 mg / L.

[0088] The water quality standards for the treated water are: COD ≤ 100 mg / L, ammonia nitrogen ≤ 8 mg / L, and total nitrogen ≤ 15 mg / L.

[0089] Example 1

[0090] The structure of the integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is as described above. The rotating packing, asymmetric packing and ordinary packing are placed in the aerobic MBBR tank. The rotating packing, asymmetric packing and ordinary packing have the same volume, and the volume ratio of the three is 3:0.5:1. The ordinary packing is a conventional MBBR packing (circular, 25mm in diameter, with 19 through holes inside). Ordinary packing is used in both the first anoxic MBBR tank and the second anoxic MBBR tank.

[0091] Example 2

[0092] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 1, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the aerobic MBBR tank is 3:1:1.

[0093] Example 3

[0094] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 1, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the aerobic MBBR tank is 3:0.4:1.

[0095] Example 4

[0096] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 1, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the aerobic MBBR tank is 3:0:1.

[0097] Example 5

[0098] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 1, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the aerobic MBBR tank is 5:0.5:1.

[0099] Example 6

[0100] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 1, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the aerobic MBBR tank is 2.9:0.5:1.

[0101] Example 7

[0102] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 1, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the aerobic MBBR tank is 0:0.5:1.

[0103] Using the daily energy consumption of the submersible mixer in the aerobic MBBR tank as a benchmark, the energy consumption of Examples 1-3 is 70%, 65%, and 88% of that of Example 4, respectively. It can be seen that the addition of asymmetric packing helps to reduce the energy consumption of the submersible mixer in the aerobic MBBR tank.

[0104] Using the COD value of the effluent from the aerobic MBBR tank as a benchmark, the COD values ​​of the effluent from the aerobic MBBR tanks in Examples 1 and 5-7 were 250, 240, 300, and 330 mg / L, respectively. It can be seen that the addition of rotating packing has a good effect on COD removal.

[0105] Example 8

[0106] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in Embodiment 1, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the first anoxic MBBR tank is 1:0.2:1; and ordinary packing is used in both the aerobic MBBR tank and the second anoxic MBBR tank.

[0107] Example 9

[0108] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 8, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the first anoxic MBBR tank is 1:0.6:1.

[0109] Example 10

[0110] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 8, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the first anoxic MBBR tank is 1:0.1:1.

[0111] Example 11

[0112] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 8, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the first anoxic MBBR tank is 1:0:1.

[0113] Example 12

[0114] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 8, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the first anoxic MBBR tank is 2:0.2:1.

[0115] Example 13

[0116] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 8, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the first anoxic MBBR tank is 0.9:0.2:1.

[0117] Example 14

[0118] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 8, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the first anoxic MBBR tank is 0:0.2:1.

[0119] Using the daily energy consumption of the submersible mixer in the first anoxic MBBR tank as a benchmark, the energy consumption of Examples 8-10 was 68%, 63%, and 85% of that of Example 11, respectively. It can be seen that the addition of asymmetric packing helps to reduce the energy consumption of the submersible mixer in the first anoxic MBBR tank.

[0120] Using the total nitrogen value of the effluent from the first anoxic MBBR tank as a benchmark, the total nitrogen values ​​of the effluent from the first anoxic MBBR tanks in Examples 8 and 12-14 were 32, 30, 37, and 41 mg / L, respectively. It can be seen that the addition of rotating packing can improve the denitrification effect.

[0121] Example 15

[0122] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in Embodiment 1, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the second anoxic MBBR tank is 2:0.5:1; and ordinary packing is used in both the aerobic MBBR tank and the first anoxic MBBR tank.

[0123] Example 16

[0124] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 15, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the second anoxic MBBR tank is 2:0.8:1.

[0125] Example 17

[0126] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 15, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the second anoxic MBBR tank is 2:0.4:1.

[0127] Example 18

[0128] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 15, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the second anoxic MBBR tank is 2:0:1.

[0129] Example 19

[0130] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 15, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the second anoxic MBBR tank is 3:0.5:1.

[0131] Example 20

[0132] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 15, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the second anoxic MBBR tank is 1.9:0.5:1.

[0133] Example 21

[0134] The integrated treatment system of MBBR coupled with multi-stage AO described in this embodiment is the same as that in embodiment 15, except that the volume ratio of rotating packing, asymmetric packing and ordinary packing in the first anoxic MBBR tank is 0:0.5:1.

[0135] Using the daily energy consumption of the submersible mixer in the second anoxic MBBR tank as a benchmark, the energy consumption of Examples 15-17 was 65%, 62%, and 80% of that of Example 18, respectively. It can be seen that the addition of asymmetric packing helps to reduce the energy consumption of the submersible mixer in the second anoxic MBBR tank.

[0136] Using the total nitrogen value of the effluent from the second anoxic MBBR tank as a benchmark, the total nitrogen values ​​of the effluent from the first anoxic MBBR tanks in Examples 15 and 19-21 were 16, 15, 19, and 23 mg / L, respectively. It can be seen that the addition of rotating packing can improve the denitrification effect.

Claims

1. An integrated treatment system of MBBR coupled multi-stage AO, characterized in that, It comprises sequentially connected anaerobic tank, first anoxic MBBR tank, first transition treatment tank, aerobic MBBR tank, second transition treatment tank, second anoxic MBBR tank and third transition treatment tank; The first anoxic MBBR tank, the aerobic MBBR tank and the second anoxic MBBR tank are each provided with two arc-shaped flow guide plates inside, the outer side of the flow guide plate protrudes towards the side wall of the adjacent tank body, and the inner side of the flow guide plate is a concave surface and faces the filler in the tank; The first transition treatment tank, the second transition treatment tank and the third transition treatment tank are each provided with a first aeration device to provide the required oxygen for each tank body; the first anoxic MBBR tank, the aerobic MBBR tank and the second anoxic MBBR tank are each provided with a second aeration device to provide aeration and promote the movement of the filler; The aerobic MBBR tank is provided with rotating filler, asymmetric filler and ordinary filler, and the volume ratio of the above-mentioned three fillers is (3-5):(0.5-1):1; The first anoxic MBBR tank is provided with rotating filler, asymmetric filler and ordinary filler, and the volume ratio of the above-mentioned three fillers is (1-2):(0.2-0.6):1; The second anoxic MBBR tank is provided with rotating filler, asymmetric filler and ordinary filler, and the volume ratio of the above-mentioned three fillers is (2-3):(0.5-0.8):1; the volume of the rotating filler, the asymmetric filler and the ordinary filler is the same; The rotating filler comprises a main frame and a nested inner and outer two layers of load parts, the main frame is a hollow circle, the outer load part comprises a plurality of triangular outer load sheets, the outer load sheet has an arc and protrudes outward of the rotating filler, the bottom edge of the outer load sheet is connected to the main frame, and the outer load sheet covers the spherical surface of the sphere where the main frame is located; Two opposite positions of the inner side wall of the main frame are respectively provided with a fixed shaft, the fixed shaft protrudes into the main frame, the main frame is provided with an inner frame, the inner frame is a hollow circle, the inner frame is rotationally connected to the two fixed shafts, and the straight line where the two fixed shafts are located is the central axis of the inner frame, and the inner frame can rotate about the central axis as the rotation shaft; The inner load part comprises a plurality of triangular inner load sheets, the inner load sheet has an arc and protrudes outward of the outer load sheet, the bottom edge of the inner load sheet is connected to the inner frame, and the inner load sheet covers the spherical surface of the sphere where the inner frame is located; The asymmetric filler comprises a head sphere, a circular cone part and a tail sphere connected in sequence, the circular cone part is a hollow circular cone, the head sphere comprises a head frame and a plurality of triangular head load sheets, and the tail sphere comprises a tail frame and a plurality of triangular tail load sheets; the head frame and the tail frame are both hollow circles, and the diameter of the head frame is greater than that of the tail frame; One side edge of the head frame is connected to the bottom edge of the head load sheet, and the other side edge is connected to one end of the small diameter of the circular cone part; one side edge of the tail frame is connected to the bottom edge of the tail load sheet, and the other side edge is connected to one end of the large diameter of the circular cone part.

2. The integrated processing system of claim 1, wherein, The first anoxic MBBR tank is rectangular, arc-shaped guide plates one and two are respectively arranged near two wide sides, a baffle one is arranged between the guide plates one and two, the baffle one is parallel to the length direction of the first anoxic MBBR tank, and is used for dividing the first anoxic MBBR tank into an upstream area one and a downstream area one with the same width; The water outlet end of the first water pipe penetrates the guide plate one, and directly enters water into the upstream area one, so that the water body and the filler sequentially pass through the upstream area one and the downstream area one along the length direction of the first anoxic MBBR tank.

3. The integrated processing system of claim 2, wherein, The guide plate one, the guide plate two and the baffle one are vertically arranged and are all higher than the liquid level of the first anoxic MBBR tank; the bottom of the guide plate one and the bottom of the guide plate two contact the bottom surface of the first anoxic MBBR tank; spaces are respectively left between the two ends of the baffle one and the inner side surfaces of the guide plate one and the guide plate two, so as to allow the filler to flow through; The water outlet end of the first water pipe exceeds the space between the guide plate one and the baffle one, and is located between the side surface of the baffle one and the long side surface of the upstream area one.

4. The integrated processing system of claim 3, wherein, The guide plate one includes a solid plate in the middle and mesh plates on both sides, the mesh plates on both sides are respectively connected to the two long side surfaces of the first anoxic MBBR tank, the guide plate two is the same in structure as the guide plate one, the mesh plates on both sides of the guide plate one and the guide plate two are uniformly provided with density through holes, so as to allow the water body to pass through and at the same time to intercept the filler, so that the filler circulates and flows in the upstream area one and the downstream area one along the length direction of the first anoxic MBBR tank.

5. The integrated processing system of claim 2, wherein, The bottom of the first anoxic MBBR tank is provided with a plurality of submersible mixers, so that the filler does not sink and deposit; the second aeration device is uniformly arranged on the two side surfaces of the baffle one, and provides a micro-oxygen environment for the upstream area one and the downstream area one respectively.

6. The integrated processing system of claim 2, wherein, The long side surface of the downstream area one is provided with a second water pipe at the top, the second water pipe is arranged outside the guide plate one and is arranged opposite to the first water pipe; a filter screen is arranged at the second water pipe.

7. The integrated processing system of claim 6, wherein, The upstream side of the first transition treatment tank is connected to the second water pipe, and a baffle is arranged in the first transition treatment tank, so as to divide the first transition treatment tank into an anoxic area one and an aerobic area one, and the bottom of the downstream end of the aerobic area one is connected to the aerobic MBBR tank through a third water pipe.

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