Efficient nitrogen and phosphorus removal sewage treatment device

Abstract

The invention provides an efficient nitrogen and phosphorus removal sewage treatment device which solves the problems that in the prior art, sewage treatment needs a large amount of chemicals, the treatment efficiency is low and the energy consumption is high. The device comprises a micro-aerobic zone, a deoxidation zone, an aerobic zone and a settling zone. Sewage firstly passes through the self-cleaning grating, particles in the sewage are intercepted, then the sewage enters the micro-aerobic zone filled with the suspended MBBR filler for primary treatment, then the sewage automatically flows into the deoxidation zone to complete denitrification nitrogen removal, then the sewage passes through the aerobic zone for a nitration reaction, and finally, mud-water separation is realized in the settling zone, and clear water is discharged. The jet aeration assembly and the sludge concentration screener are respectively used for providing oxygen, stirring and treating sludge, so that the use of chemicals is reduced; the whole system is driven by only one pump, the functions of aeration, filler stirring, sludge backflow and the like are realized by utilizing the structural design, and the operation management and maintenance are simplified; in addition, a gravity backflow mode is adopted in the settling zone, the additional pumping requirement is omitted, the energy consumption is further reduced, and the treatment efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a high-efficiency nitrogen and phosphorus removal sewage treatment device. Background Art

[0002] Wastewater treatment is the process of purifying wastewater to meet water quality standards for discharge into a specific water body or reuse. This process is widely used in a variety of industries, including construction, agriculture, transportation, energy, petrochemicals, environmental protection, urban landscape design, healthcare, and food services, and is increasingly integrated into the daily lives of ordinary people.

[0003] Townships make up a significant portion of China's urban system and are relatively dispersed. According to the 2019 Urban and Rural Construction Statistical Yearbook, by the end of 2019, a total of 10,650 sewage treatment plants had been established in towns nationwide, with an average of approximately 0.95 sewage treatment facilities per town, and a daily treatment capacity of 18.7488 million cubic meters. The sewage treatment rate of these facilities reached 54.43%, while the centralized treatment rate was 45.26%. During the same period, there were 1,830 sewage treatment plants at the township level, with an average of approximately 0.58 sewage treatment facilities per township, and a daily treatment capacity of 801,100 cubic meters.

[0004] Compared to urban areas, rural wastewater treatment faces unique challenges: lower wastewater flows, greater fluctuations in pollutant loads, a pipeline network system in need of improvement, and insufficiently scientific operational management. Furthermore, most rural wastewater is characterized by a low carbon-to-nitrogen ratio, which often requires the addition of large amounts of chemicals during the treatment process. This not only hinders efficient treatment, but also leads to high energy consumption and maintenance difficulties. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-efficiency denitrification and dephosphorization sewage treatment device to solve the technical problems that the current sewage treatment technology usually requires the addition of a large amount of chemicals for sewage treatment, cannot achieve efficient treatment, has high energy consumption, and is difficult to maintain.

[0006] The present invention provides an efficient sewage treatment device for denitrification and phosphorus removal, comprising: an anoxic zone, provided with a first water inlet, a first filler barrier net, and a self-cleaning inlet grille connected to the first water inlet, and the interior of the anoxic zone is filled with suspended MBBR fillers; a deoxygenation zone, provided with a second water inlet connected to the anoxic zone through the first filler barrier net; an aerobic zone, the interior of which is filled with suspended MBBR fillers; a sedimentation zone, including an influent diversion partition, a sludge thickening partition, a three-phase separator, an inclined tube sedimentation partition, and an effluent weir, and the influent diversion partition is connected to the upper part of the aerobic zone through a second filler barrier net; a jet aeration assembly, including a jet agitator arranged in the anoxic zone and a jet aerator arranged in the aerobic zone; a sludge thickening and screening device, the bottom of which is provided with a sludge discharge port, and the sludge discharge valve is linked through a sludge concentration meter; a mixed liquor suction pipe, one end of which is arranged at the bottom of the deoxygenation zone; a digestion liquid reflux pipe, one end of which is arranged at the top of the deoxygenation zone near the second water inlet, and the other end is connected to the upper part of the aerobic zone; wherein, the other end of the mixed liquor suction pipe is connected to the sludge thickening and screening device, the sludge thickening and screening device is connected to the jet aerator through a pump, and the bottom of the sedimentation zone is connected to the bottom of the deoxygenation zone through a sludge gravity reflux pipe.

[0007] According to an embodiment of the present invention, the anoxic zone is provided with a jet efficiency enhancer connected to the jet agitator, and the aerobic zone is provided with an aeration efficiency enhancer connected to the jet aerator.

[0008] According to an embodiment of the present invention, the sludge thickening and screening device includes a tank body, a slag barrier net arranged inside the tank body, and a feed inlet, a discharge outlet, and a sludge discharge port arranged on the tank body, the discharge outlet is connected to the anoxic zone and the aerobic zone through a pump respectively, and the feed inlet is connected to the bottom of the deoxygenation zone through the mixed liquor suction pipe.

[0009] According to an embodiment of the present invention, the influent diversion partition of the sedimentation zone is provided with a variable-diameter flow passage, which is formed by enclosing a first partition board, a first inclined board, and a second inclined board, and has a structure that is larger at the top and smaller at the bottom in the vertical direction.

[0010] According to an embodiment of the present invention, the sludge thickening partition is located at the bottom of the sedimentation zone and has a funnel-shaped structure, and the top of the three-phase separator is provided with a gas guide pipe.

[0011] According to an embodiment of the present invention, the volume ratio of the suspended MBBR fillers in the anoxic zone and the aerobic zone is both 30% - 60%.

[0012] According to an embodiment of the present invention, the three-phase separator is located in the middle of the sludge thickening partition, and its installation angle is less than 60 degrees.

[0013] According to an embodiment of the present invention, the inclined tubes in the inclined tube sedimentation partition are installed at an angle of 70 degrees with the horizontal plane and are evenly distributed in the upper water passing area of the sedimentation zone.

[0014] According to an embodiment of the present invention, both the jet stirrer and the jet aerator adopt retractable stainless steel air distribution pipes, and the aperture of the aeration holes is smaller than the diameter of the suspended MBBR packing.

[0015] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0016] (1) By setting up a micro-oxygen zone, the present invention stably controls the dissolved oxygen in the micro-oxygen zone, utilizes the accumulation of denitrifying bacteria and the growth of polyphosphate-accumulating bacteria. At the same time, MBBR packing is added to the micro-oxygen zone, creating conditions for the accumulation of short-cut denitrifying bacteria and anaerobic ammonium-oxidizing bacteria. The sewage first enters the micro-oxygen zone, and the limited carbon source is fully utilized. While obtaining efficient nitrogen and phosphorus removal effects, the dosage of chemicals is reduced or even no chemicals need to be added.

[0017] (2) There is only one water pump in the whole system of the present invention. Through the structural design, aeration and oxygenation, packing stirring, packing fluidization, sludge reflux, and digestion liquid reflux are realized, which is convenient for operation management and maintenance. The position of the sedimentation tank is different from that of the traditional process. Compared with the traditional process, the sedimentation tank of the present invention is located in the middle, while the sedimentation tank of the traditional equipment is set at the end. The sludge in the sedimentation tank needs to be refluxed by a pump. The design of the present invention omits the pump of the sedimentation tank, and the sludge refluxes by gravity.

[0018] (3) The present invention adopts jet aeration and jet stirring. With the strong hydraulic shear action, the activated sludge is separated into smaller particles, having a larger specific surface area, and further improving the treatment effect.

[0019] (4) The multi-functional filter residue device of the present invention can realize continuous slag and sludge discharge with the intervention of a sludge concentration meter, ensuring the sludge concentration in the biochemical area.

[0020] (5) The present invention sets up a pre-separation zone in the inlet area of the sedimentation zone. This area can realize primary three-phase separation, isolate the air from entering the sedimentation zone, and at the same time set up a diversion zone to realize rapid separation of mud and water.

[0021] (6) The present invention sets up a three-phase separator in the main sedimentation zone, and a gas guide pipe is set at the top of the three-phase separator. The gas generated by the denitrification of the sludge at the bottom is discharged through the gas guide pipe, preventing the generated gas from disturbing the sludge and affecting the sedimentation effect.

[0022] (7) The present invention sets up a deoxygenation zone that can be used as a biological selection zone to realize the preferential selection of the dominant flora of nitrifying bacteria, denitrifying bacteria, and polyphosphate-accumulating bacteria, and further improve the removal efficiency of pollutants.

[0023] (8) The filter residue bucket of the present invention is mixed with the muddy water mixture in the deoxygenation zone and the aerobic zone. The sludge internal circulation is realized by valve control, the nitrification liquid reflux ratio is increased, from 100%-400% to 500%-800%. The dissolved oxygen ratio of each link is controlled, and the reflux ratio is increased according to different mixing methods, and the hydraulic retention time is shortened. The sludge external circulation is realized through the filler interception device and the sludge gravity reflux device, the denitrification efficiency is improved, the anaerobic time is reduced, the energy consumption is saved, the sludge circulation reduces the addition of chemicals, and the substances generated by denitrification itself can be used as the nutrients required for nitrification. Brief Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a flowchart of a sewage treatment device for efficient nitrogen and phosphorus removal provided in Embodiment 1 of the present invention.

[0026] Figure 2 It is a general layout plan of a sewage treatment device for efficient nitrogen and phosphorus removal provided in Embodiment 1 of the present invention.

[0027] Figure 3 It is a bottom plan view of a sewage treatment device for efficient nitrogen and phosphorus removal provided in Embodiment 1 of the present invention.

[0028] Figure 4 It is a cross-sectional view of a sewage treatment device for efficient nitrogen and phosphorus removal provided in Embodiment 1 of the present invention.

[0029] Icon:

[0030] 100, micro-oxygen zone; 110, inlet self-cleaning grille; 120, first inlet; 130, first filler interception net; 140, jet mixer; 150, jet efficiency enhancer;

[0031] 200, deoxygenation zone; 210, second inlet; 220, mixed liquid suction pipe; 230, digestion liquid reflux pipe;

[0032] 300, aerobic zone; 310, jet aerator; 320, aeration efficiency enhancer; 330, second filler interception net; 340, interception grille; 350, sludge gravity reflux pipe;

[0033] 400, sedimentation zone;

[0034] 410. Inlet water diversion partition; 411. First baffle; 412. First inclined plate; 413. Second inclined plate; 420. Sludge thickening partition; 430. Three-phase separator; 431. Gas guide pipe; 440. Inclined tube sedimentation partition; 450. Effluent weir;

[0035] 500. Sludge thickening and screening device; 510. Sludge discharge port; 520. Sludge discharge valve;

[0036] 600. Water pump. Detailed implementation manner

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0038] Embodiment 1

[0039] Embodiment 1 of the present invention provides an efficient nitrogen and phosphorus removal sewage treatment device to solve the technical problems that the sewage treatment in the current prior art usually requires adding a large amount of chemicals for sewage treatment, cannot achieve efficient treatment, has high energy consumption, and is difficult to maintain.

[0040] Please refer to Figure 1 the flow chart and Figure 2 , Figure 3 and Figure 4 the equipment diagram. An efficient nitrogen and phosphorus removal sewage treatment device provided by the present invention includes:

[0041] An anoxic zone 100 is provided with a first water inlet 120, a first filler retaining net 130, and a self-cleaning inlet grille 110 connected to the first water inlet 120. The inside of the anoxic zone 100 is filled with suspended MBBR fillers. In this embodiment, the first water inlet 120 is located at the edge of the device and is connected to an external sewage pipe. The self-cleaning inlet grille 110 is directly connected to the first water inlet 120 and is used to intercept large particle impurities (such as fibers, plastics, etc.). The first filler retaining net 130 is installed at the top in the middle of the anoxic zone 100. The suspended MBBR fillers (volume ratio 30% - 60%) are dispersed throughout the anoxic zone 100. In this embodiment, arranging the water inlet at the edge can reduce the direct impact of the inlet water on the fillers, ensure uniform water flow distribution, the self-cleaning grille avoids blockage of subsequent components by large particle impurities, reduces the maintenance frequency, and the filler retaining net is set at the top to prevent the fillers from entering the deoxygenation zone 200 with the water flow, ensuring a stable filler concentration (30% - 60%) in the anoxic zone 100;

[0042] The deoxygenation zone 200 is provided with a second water inlet 210 that communicates with the micro-oxygen zone 100 through the first filler retaining net 130, so that the upper liquid in the micro-oxygen zone 100 can flow into the deoxygenation zone 200. Water enters at the top of the second water inlet 210 of the deoxygenation zone 200 to ensure the smooth inflow of the supernatant in the micro-oxygen zone 100 and avoid stirring the bottom sludge;

[0043] The aerobic zone 300 is filled with suspended MBBR fillers inside;

[0044] The sedimentation zone 400 includes an influent diversion partition 410, a sludge thickening partition 420, a three-phase separator 430, an inclined tube sedimentation partition 440, and an effluent weir 450. The influent diversion partition 410 communicates with the upper part of the aerobic zone 300 through a second filler retaining net 330. The second filler retaining net 330 is located between the aerobic zone 300 and the sedimentation zone 400 to intercept fillers from entering the sedimentation zone 400 and prevent MBBR fillers from entering the sedimentation zone 400 and blocking the inclined tubes, ensuring the sedimentation effect;

[0045] The jet aeration assembly includes a jet agitator 140 provided in the micro-oxygen zone 100 and a jet aerator 310 provided in the aerobic zone 300. In this embodiment, the jet aeration assembly in the micro-oxygen zone 100 is located at the middle bottom of the micro-oxygen zone 100. Hydraulic shear is generated through the jet device to promote the fluidization of the fillers. Bottom jet agitation provides a micro-oxygen environment to promote the enrichment of denitrifying bacteria and polyphosphate-accumulating bacteria. At the same time, the sludge is sheared to increase the specific surface area. In this embodiment, in the aerobic zone 300, the jet aerator 310 and the efficiency enhancer are located at the middle bottom of the aerobic zone 300. Dissolved oxygen is provided through aeration. Bottom aeration provides sufficient oxygen to promote the activity of nitrifying bacteria. At the same time, the sludge particles are refined by hydraulic shear;

[0046] In this embodiment, the jet agitator 140 in the micro-oxygen zone 100 uses the mixed liquid (suction from the bottom of the deoxygenation zone 200) as the power liquid to achieve agitation and micro-oxygen control; the jet aerator 310 in the aerobic zone 300 uses the liquid pumped by the sludge thickening and screening device 500 to drive aeration to provide a high dissolved oxygen environment; the pore diameter of the air holes of the retractable stainless steel air distribution pipe < the diameter of the MBBR fillers to prevent blockage and flexibly adjust the aeration range. In this embodiment, only one pump (the outlet water pump 600 of the sludge thickening and screening device 500) is required to drive jet aeration and sludge circulation, reducing energy consumption. The jet action refines the sludge particles and improves the microbial metabolism efficiency.

[0047] The sludge concentrating and screening device 500 is provided with a sludge discharge port 510 at the bottom, which is linked to a sludge discharge valve through a sludge concentration meter. In this embodiment, the feed port of the sludge concentrating and screening device 500 is connected to the mixed liquid suction pipe 220 at the bottom of the deoxygenation zone 200. The slag screen intercepts inorganic impurities (such as sand and residue) to protect subsequent equipment. The discharge port is connected to the micro-aerobic zone 100 and the aerobic zone 300 through a pump to circulate the mixed liquid for enriching microorganisms. The sludge concentration meter at the sludge discharge port 510 is linked to the sludge discharge valve to automatically control the discharge of residual sludge. The sludge concentrating and screening device 500 maintains the sludge concentration in the biochemical zone to prevent sludge aging. The mixed liquid circulation provides jet power and reduces the addition of reagents.

[0048] A mixed liquid suction pipe 220, one end of which is provided at the bottom of the deoxygenation zone 200, draws the mixed liquid (including denitrification sludge) at the bottom of the deoxygenation zone 200 to the sludge concentrating and screening device 500 for recycling after screening;

[0049] The digestion liquid return pipe 230 has one end located at the top of the deoxygenation zone 200 near the second water inlet 210, and the other end connected to the upper part of the aerobic zone 300. The nitrification liquid return pipe connects the aerobic zone 300 and the microaerobic zone 100. The high reflux ratio returns the nitrification liquid to the microaerobic zone 100 to replenish nitrate for denitrifying bacteria to achieve short-range denitrification.

[0050] Among them, the other end of the mixed liquor suction pipe 220 is connected to the sludge thickening screen 500, and the sludge thickening screen 500 is connected to the jet aerator 310 through a pump. The bottom of the sedimentation zone 400 is connected to the bottom of the deoxygenation zone 200 through the sludge gravity return pipe 350. The sludge in the sedimentation zone 400 relies on gravity to return to the deoxygenation zone 200, without the need for additional pumping, thereby reducing energy consumption.

[0051] In this embodiment, the micro-aerobic zone 100 is provided with a jet synergist releaser 150 connected to the jet agitator 140, and the aerobic zone 300 is provided with an aeration synergist releaser 320 connected to the jet aerator 310. The jet synergist releaser 150 optimizes the jet gas diffusion efficiency and improves the dissolved oxygen control accuracy.

[0052] In this embodiment, the sludge thickening and screening device 500 includes a tank body, a slag retaining net arranged inside the tank body, and a feed port, a discharge port and a sludge discharge port 510 arranged on the tank body. The discharge port is connected to the micro-aerobic zone 100 and the aerobic zone 300 respectively through a pump, and the feed port is connected to the bottom of the deoxygenation zone 200 through a mixed liquid suction pipe 220.

[0053] In this embodiment, the water inlet diversion partition 410 of the sedimentation area 400 is provided with a variable diameter circulation channel, which is formed by a first partition plate 411, a first inclined plate 412 and a second inclined plate 413, and has a large upper and small lower structure in the vertical direction. The large upper and small lower structure reduces the water flow velocity, avoids disturbing the sludge layer, and achieves a smooth transition.

[0054] In this embodiment, the sludge concentration zone 420 is located at the bottom of the sedimentation zone 400 and has a bucket-shaped structure. An air duct 431 is provided at the top of the three-phase separator 430. The three-phase separator 430 separates sludge, sewage and denitrification gas (discharged through the air duct 431) to prevent the gas from stirring the sludge. The bucket-shaped structure of the sludge concentration bucket zone accelerates sludge concentration, and gravity reflux reduces pumping energy consumption.

[0055] In this embodiment, the volume proportion of the suspended MBBR fillers in the micro-aerobic zone 100 and the aerobic zone 300 is 30% to 60%.

[0056] In this embodiment, the three-phase separator 430 is located in the middle of the sludge concentration zone 420, and its installation angle is less than 60 degrees.

[0057] In this embodiment, the inclined tubes of the inclined tube sedimentation zone 440 are installed at an angle of 70 degrees to the horizontal plane and are evenly distributed in the upper water flow area of the sedimentation zone 400. The 70° inclination of the inclined tube sedimentation zone 400 optimizes sedimentation efficiency and shortens hydraulic retention time.

[0058] In this embodiment, the jet stirrer 140 and the jet aerator 310 both use retractable stainless steel air distribution pipes, and the diameter of the aeration holes is smaller than the diameter of the suspended MBBR filler.

[0059] In this embodiment, the power liquid of the jet aerator 310 is the mixed liquid at the bottom of the deoxygenation zone 200 (including: the mixed liquid flowing from the micro-aerobic zone 100, the digested liquid from the aerobic zone 300, and the sludge at the bottom of the sedimentation zone 400). It passes through the mixed liquid suction pipe 220, passes through the cyclone sludge concentrating screen 500, and is pumped into the ejector assembly by a pump. The sludge concentrating screen 500 is connected to the sludge discharge valve 520.

[0060] In this embodiment, the end of the nitrification liquid reflux pipe is disposed in the aerobic zone 300 through a material blocking grid 340 .

[0061] The following is a detailed description of the use of the high-efficiency denitrification and dephosphorization sewage treatment device of the present invention:

[0062] Micro-aerobic zone 100: Sewage enters the micro-aerobic zone 100 through the first water inlet 120 via an external lift pump. Large impurities in the sewage are first intercepted by a basket grille provided above the micro-aerobic zone 100. The micro-aerobic zone 100 is filled with MBBR filler with a regional height of 30% to 60%. Anaerobic microorganisms on the filler decompose organic matter in the sewage, and the detached biofilm forms precipitated sludge. The supernatant flows through the filler intercepting net through the second water inlet 210 into the deoxygenation zone 200. The MBBR filler in the micro-aerobic zone 100 is fluidized by the jet agitator 140.

[0063] Deoxygenation zone 200: The supernatant fluid that flows by gravity from the micro-aerobic zone 100 into the deoxygenation zone 200 undergoes a secondary reaction in the deoxygenation zone 200, and denitrification and nitrogen removal are completed under an anoxic environment. The sludge is refluxed to the micro-aerobic zone 100 through the mixed liquor reflux pipe. The mixed liquor at the bottom of the deoxygenation zone 200 enters the sludge thickening and screening device 500 through the mixed liquor suction pipe 220. The sludge concentration meter is linked with the sludge discharge valve to control the sludge discharge frequency, and the excess sludge is discharged through the sludge discharge port 510.

[0064] Aerobic zone 300: The effluent from the deoxygenation zone 200 is lifted to the aerobic zone 300 by a pump. The jet aerator 310 provides oxygen and stirs the packing. The nitrification liquid is refluxed to the micro-aerobic zone 100 through the nitrification liquid reflux pipe at a reflux ratio of 500% - 800%.

[0065] Sedimentation zone 400: The mixed liquor from the aerobic zone 300 enters the sedimentation zone 400 through the second packing baffle net 330. After inclined tube sedimentation and separation, the clear water is discharged through the effluent weir 450. The sludge in the sedimentation zone 400 is directly refluxed to the deoxygenation zone 200 through the sludge gravity reflux pipe without additional pumping.

[0066] The embodiments of the present invention have at least the following advantages:

[0067] (1) By setting the micro-aerobic zone in the present invention, the dissolved oxygen in the micro-aerobic zone is stably controlled. The accumulation of denitrifying bacteria and the growth of polyphosphate-accumulating bacteria are utilized. At the same time, MBBR packing is added to the micro-aerobic zone, creating conditions for the accumulation of short-cut denitrifying bacteria and anaerobic ammonia-oxidizing bacteria. The sewage first enters the micro-aerobic zone, and the limited carbon source is fully utilized. While obtaining efficient nitrogen and phosphorus removal effects, the dosage of chemicals is reduced or even no chemicals need to be added.

[0068] (2) There is only one water pump in the whole system of the present invention. Through the design of the structure, aeration and oxygenation, packing stirring, packing fluidization, sludge reflux, and digestion liquid reflux are realized, which is convenient for operation management and maintenance. The position of the sedimentation tank is different from that of the traditional process. Compared with the traditional process, the sedimentation tank set in the present invention is in the middle, while the sedimentation tank of the traditional equipment is set at the end. The sludge in the sedimentation tank needs to be refluxed by a pump. The design of the present invention omits the pump of the sedimentation tank, and the sludge refluxes by gravity.

[0069] (3) The present invention adopts jet aeration and jet stirring. Due to the strong hydraulic shear action, the activated sludge is separated into smaller particles, having a larger specific surface area, and further improving the treatment effect.

[0070] (4) The multi-functional filter residue device of the present invention can realize continuous slag and sludge discharge under the intervention of the sludge concentration meter, ensuring the sludge concentration in the biochemical zone.

[0071] (5) A pre-separation zone is set in the inlet area of the sedimentation zone of the present invention. This area can achieve three-phase separation once, isolate the air from entering the sedimentation zone, and at the same time set a diversion zone to achieve rapid separation of mud and water.

[0072] (6) The present invention provides a three-phase separator in the main precipitation area, and an air duct is provided at the top of the three-phase separator. The gas generated by denitrification of the sludge at the bottom is discharged through the air duct, preventing the generated gas from disturbing the sludge and affecting the precipitation effect.

[0073] (7) The present invention provides a deoxygenation area that can be used as a biological selection area to achieve the optimization of the dominant flora of nitrifying bacteria, denitrifying bacteria, and phosphorus-accumulating bacteria, further improving the removal efficiency of pollutants.

[0074] (8) The filter residue barrel of the present invention is mixed with the muddy water mixture in the deoxygenation area and the aerobic area. The internal sludge circulation is realized by controlling the valve, improving the nitrification liquid reflux ratio from 100%-400% to 500%-800%, controlling the dissolved oxygen ratio in each link, increasing the reflux ratio according to different mixing methods, and shortening the hydraulic retention time; the external sludge circulation is realized through the filler interception device and the sludge gravity reflux device, improving the denitrification efficiency, reducing the anaerobic time, saving energy consumption, reducing the addition of chemicals in the sludge circulation, and the substances generated by denitrification itself can be used as the nutrients required for nitrification.

[0075] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An efficient sewage treatment device for nitrogen and phosphorus removal, characterized in that, include: The micro-aerobic zone is provided with a first water inlet, a first filler blocking net and a water inlet self-cleaning grid connected to the first water inlet, and the micro-aerobic zone is filled with suspended MBBR filler; The deoxygenation zone is provided with a second water inlet connected to the micro-aerobic zone through the first filler blocking net; The aerobic zone is filled with suspended MBBR filler; The sedimentation zone includes a water inlet diversion zone, a sludge concentration zone, a three-phase separator, an inclined tube sedimentation zone, and a water outlet weir. The water inlet diversion zone is connected to the upper part of the aerobic zone through a second filler material blocking net; A jet aeration assembly includes a jet stirrer arranged in the micro-aerobic zone and a jet aerator arranged in the aerobic zone; The sludge concentrator is equipped with a sludge discharge port at the bottom, which is linked to the sludge discharge valve through the sludge concentration meter; a mixed liquid suction pipe, one end of which is located at the bottom of the deoxidation zone; A digestion liquid reflux pipe, one end of which is located at the top of the deoxygenation zone near the second water inlet, and the other end is connected to the upper part of the aerobic zone; The other end of the mixed liquor suction pipe is connected to a sludge concentrating screen, and the sludge concentrating screen is connected to a jet aerator through a pump. The bottom of the sedimentation zone is connected to the bottom of the deoxygenation zone through a sludge gravity return pipe.

2. The high-efficiency nitrogen and phosphorus removal sewage treatment device according to claim 1, wherein, The micro-aerobic zone is provided with a jet synergistic releaser connected to the jet stirrer, and the aerobic zone is provided with an aeration synergistic releaser connected to the jet aerator.

3. The high-efficiency nitrogen and phosphorus removal sewage treatment device according to claim 1, characterized in that The sludge concentrating and screening device includes a tank body, a slag blocking net arranged inside the tank body, and a feed port, a discharge port and a sludge discharge port arranged on the tank body. The discharge port is connected to the micro-aerobic zone and the aerobic zone respectively through a pump, and the feed port is connected to the bottom of the deoxygenation zone through a mixed liquid suction pipe.

4. The high-efficiency nitrogen and phosphorus removal sewage treatment device according to claim 1, characterized in that, The water inlet diversion partition of the sedimentation zone is provided with a variable diameter flow channel, which is formed by a first partition plate, a first inclined plate and a second inclined plate, and has a larger upper and smaller lower structure along the vertical direction.

5. The high-efficiency nitrogen and phosphorus removal sewage treatment device according to claim 1, wherein The sludge concentration partition is located at the bottom of the sedimentation zone and has a bucket-shaped structure. An air guide pipe is provided on the top of the three-phase separator.

6. The high-efficiency nitrogen and phosphorus removal sewage treatment device according to claim 1, wherein The volume proportion of the suspended MBBR fillers in the microaerobic zone and the aerobic zone is 30% to 60%.

7. The high-efficiency nitrogen and phosphorus removal sewage treatment device according to claim 1, wherein The three-phase separator is located in the middle of the sludge concentration zone, and its installation angle is less than 60 degrees.

8. The high-efficiency nitrogen and phosphorus removal sewage treatment device according to claim 1, characterized in that, The inclined tubes of the inclined tube sedimentation partition are installed at an angle of 70 degrees to the horizontal plane and are evenly distributed in the upper water flow area of the sedimentation zone.

9. The high-efficiency nitrogen and phosphorus removal sewage treatment device according to claim 1, characterized in that, The jet agitator and the jet aerator both adopt retractable stainless steel air distribution pipes, and the diameter of the aeration holes is smaller than the diameter of the suspended MBBR filler.

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