An integrated sedimentation built-in deep water aeration bioreactor

Abstract

The present application provides an integrated sedimentation built-in deep aeration bioreactor, which includes: an anoxic zone, an aerobic zone and a sedimentation zone. The sedimentation zone is arranged above the anoxic zone and is provided with a sludge hopper therein for returning the precipitated sludge to the anoxic zone through the annular gap at the bottom of the sludge hopper. The aerobic zone is arranged on the periphery of the anoxic zone and the sedimentation zone, and the aerobic zone surrounds the anoxic zone and / or the sedimentation zone. An aeration device is arranged in the aerobic zone. The anoxic zone is communicated with the aerobic zone through a communication port. The mixed liquid in the aerobic zone is lifted by an air lift pump and passes through a sludge return air-liquid separation tank and a spoke-shaped or annular water distribution device to the sedimentation zone for solid-liquid separation. The water after solid-liquid separation is discharged through an effluent weir. The mixed liquid that needs to be returned from the aerobic zone to the anoxic zone is lifted by a mixed liquid air lift pump to the mixed liquid air-liquid separation tank, and after separation, it enters the anoxic zone together with the influent. Such a wastewater treatment device has high efficiency, low floor area and low maintenance workload.

Description

Technical Field

[0001] The present application relates to the field of wastewater treatment, and particularly to an integrated sedimentation built-in deep water aeration bioreactor suitable for organic wastewater, high nitrogen-containing wastewater, and toxic and harmful wastewater. Background Art

[0002] The discharge standards for total ammonia nitrogen and total nitrogen in industries such as petrochemical, coking, coal chemical, municipal, brewing, and iron and steel have been further improved. Generally, the discharge standard for ammonia nitrogen is 5 mg / L, and the discharge standard for total nitrogen is 15 mg / L. In some cases, even higher requirements are needed. Currently, most industrial industries adopt a two-stage anoxic / aerobic and sedimentation process, which has a long process flow, many power equipment, a large floor area, and high operation and maintenance costs.

[0003] Therefore, it is necessary to improve the existing wastewater treatment device. Summary of the Invention

[0004] In view of this, aiming at the problems existing in the existing device, the present application proposes an integrated sedimentation built-in deep water aeration bioreactor (hereinafter referred to as the device) that integrates anoxic / aerobic biochemistry, sedimentation, sludge reflux, mixed liquor reflux, and aeration. This device can achieve the removal of biodegradable pollutants such as organic matter, nitrogen, and phosphorus.

[0005] To achieve the above purpose, the present application adopts the following scheme.

[0006] An integrated sedimentation built-in deep water aeration bioreactor, characterized in that it includes:

[0007] An anoxic zone, an aerobic zone, and a sedimentation zone.

[0008] The sedimentation zone is arranged above the anoxic zone, and a sludge hopper is provided therein for returning the precipitated sludge to the anoxic zone through a circular gap at the bottom of the sludge hopper.

[0009] The aerobic zone is arranged outside the anoxic zone and the sedimentation zone, and the aerobic zone surrounds the anoxic zone and / or the sedimentation zone. An aeration device is arranged in the aerobic zone.

[0010] The anoxic zone is communicated with the aerobic zone through a communication port.

[0011] The mixed liquor in the aerobic zone is lifted by an air lift pump and passed through a sludge reflux gas-liquid separation tank, a spoke-shaped or annular water distribution device to the sedimentation zone for solid-liquid separation. The water after solid-liquid separation is discharged through an effluent weir.

[0012] The mixed liquid that needs to be refluxed from the aerobic zone to the anoxic zone is lifted by a mixed liquid air lift pump to the mixed liquid gas-liquid separation tank, and after separation, it enters the anoxic zone together with the influent water. Through such a design, the water treated by this equipment meets the total nitrogen discharge standard of 15 mg / L, or in cases where higher requirements are needed. Compared with the current situation, most industrial industries adopt a two-stage anoxic / aerobic and sedimentation process. This equipment shortens it to a one-stage biochemical process, effectively removing organic matter, ammonia nitrogen, total nitrogen, phosphorus, SS, etc., and has the ability to resist the impact of toxic and harmful substances. It is especially suitable for use in industries such as coking, coal chemical industry, and petrochemical industry, and has great advantages in reducing the pond volume and saving land area.

[0013] In one embodiment, the aeration device adopts a flexible perforated aeration pipe, and air outlet holes are arranged on the aeration pipe, and the air outlet holes are vertically and uniformly arranged downward, or the aeration device is a microporous aeration device.

[0014] In one embodiment, the mud hopper is conical or annular conical; a sludge reflux port or an annular reflux slit is arranged on the lower side of the mud hopper.

[0015] In one embodiment, a flow guide plate is arranged at the reflux slit or reflux port, or a conical flow guide device is arranged below the sludge reflux port, or

[0016] The reflux slit / reflux port is inclined downward and extends for a certain length.

[0017] In one embodiment, the integrated sedimentation is internally provided with a deep water aeration biological reactor, which is characterized in that it includes a sedimentation component configured in the sedimentation area. The air lift pump lifts the mixed liquid in the aerobic zone to the sludge reflux gas-liquid separation tank, which is configured at the top of the biological reactor. A fence, a flow stabilizing plate and a measuring weir are arranged in the gas-liquid separation tank. After the mixed liquid passes through the gas-liquid separation tank, it enters a spoke-type or ring-type water distribution device and is evenly distributed to the sedimentation area for solid-liquid separation.

[0018] In one embodiment, the water outlet of the water distribution device is a water distribution bell mouth or a water distribution ring.

[0019] In one embodiment, for the integrated sedimentation with a deep water aeration biological reactor, the effluent from the solid-liquid separation in the sedimentation area is discharged to the collection tank through the effluent weir arranged at the upper part of the sedimentation area and then discharged through the discharge port.

[0020] In one embodiment, the effluent weir is a triangular weir.

[0021] In one embodiment, a stirring device is configured in the anoxic zone, which uses mechanical stirring. A vertical mixer or a submersible mixer can be selected, and the pushing flow direction is downward. This avoids the water stirred from interfering with the sedimentation in the sedimentation area upward.

[0022] In one embodiment, the communication ports are arranged at the bottom of the bioreactor. The plurality of communication ports are evenly arranged in the circumferential direction and avoid the air lift pump to prevent short circuit flow.

[0023] In one embodiment, the integrated sedimentation deep water aeration bioreactor is characterized in that

[0024] It further includes: a liquid level gauge arranged at the measuring weir, an air flow meter arranged on the air pipeline for air lift to control the amount of mixed liquid lifted, and a dissolved oxygen meter arranged in the aerobic zone to control the amount of air for aeration.

[0025] In one embodiment, the aeration device is deep water aeration, with a total height between 10 and 15 m, and the water depth in the aerobic zone is between 9 and 14 m.

[0026] In one embodiment, the mixed liquid reflux is realized by a mixed liquid reflux air lift pump. The mixed liquid reflux ratio is 5 - 40:1, and the mixed liquid reflux amount can be adjusted by adjusting the air amount of the air lift pump; the mixed liquid is lifted to the gas-liquid separation tank by the mixed liquid air lift pump. The gas-liquid separation tank is provided with a special structure fence, a steady flow plate and a measuring weir at the rear end. The gas-liquid separation tank is arranged at the top of the equipment; the reflux mixed liquid is mixed with the influent at the rear end of the gas-liquid separation tank and then enters the central draft tube in the center of the equipment and the influent ring around the upper part of the anoxic zone, and then enters the anoxic zone.

[0027] Beneficial effects

[0028] Compared with the prior art, the embodiments of the present application have the following advantages:

[0029] The integrated reactor proposed in the present application is a wastewater treatment device with high efficiency, low floor area and low maintenance workload, suitable for organic wastewater treatment and nitrogen removal from high nitrogen-containing wastewater, with strong impact resistance to toxic and harmful substances in the wastewater and high removal efficiency. Brief description of the drawings

[0030] According to the following detailed description of the exemplary embodiments with reference to the accompanying drawings, other features and aspects of the present application will become clear.

[0031] The drawings included in the specification and constituting a part of the specification, together with the specification, illustrate the exemplary embodiments, features and aspects of the present application and are used to explain the principles of the present application.

[0032] Figure 1 It is a schematic diagram of the treatment process of the bioreactor of the embodiment of the present application.

[0033] Figure 2 It is a schematic front sectional view of the bioreactor of the embodiment of the present application.

[0034] Figure 3 It isFigure 2 Top view schematic diagram of the bioreactor of the embodiment.

[0035] Figure 4 For Figure 2 Deformed schematic diagram of the bioreactor of the embodiment.

[0036] Figure 5a Front view cross-sectional schematic diagram of the bioreactor of an embodiment of the present application.

[0037] Figure 5b 5a is a top view schematic diagram.

[0038] Figure 6a Front view cross-sectional schematic diagram of the bioreactor of an embodiment of the present application.

[0039] Figure 6b 6a is a top view schematic diagram.

[0040] Figure 7a Front view cross-sectional schematic diagram of the bioreactor of another embodiment of the present application.

[0041] Figure 7b 7a is a top view schematic diagram.

[0042] Figure 8a Front view cross-sectional schematic diagram of the bioreactor of another embodiment of the present application.

[0043] Figure 8b 8a is a top view schematic diagram.

[0044] Figure 9a Front view cross-sectional schematic diagram of the bioreactor of another embodiment of the present application.

[0045] Figure 9b 9a is a top view schematic diagram. Detailed implementation manners

[0046] The following will describe in detail various exemplary embodiments, features, and aspects of the present application with reference to the accompanying drawings. The same reference numerals in the drawings denote elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings do not have to be drawn to scale unless otherwise specified. Explanation of terms: In this embodiment, TDS (total dissolved solids) will be mentioned, which refers to total dissolved solids, also known as total salt content, including the content of both inorganic and organic substances. COD (Chemical Oxygen Demand) refers to the amount of reducing substances that need to be oxidized in a water sample measured by a chemical method.

[0047] An embodiment of the present application proposes an integrated wastewater treatment biological reaction device called Sedimentation Integral Deep Aeration Biological Reactor. This reactor consists of anoxic / aerobic biochemical treatment, sedimentation, sludge return, mixed liquor return, aeration device, etc., and is mainly used for biochemical degradation of organic substances in wastewater, thereby reducing COD, BOD, ammonia nitrogen, total nitrogen, total phosphorus, SS, etc., and can replace the "anoxic tank - aerobic tank - sedimentation tank" in the traditional activated sludge treatment process. It is a wastewater treatment device with high efficiency, low floor area, and low maintenance workload, suitable for organic wastewater treatment and nitrogen removal from high-nitrogen wastewater, with strong impact resistance and high removal efficiency for toxic and harmful substances in wastewater.

[0048] This biological reactor integrates anoxic / aerobic biochemical treatment, sedimentation, sludge return, mixed liquor return, and aeration, and can achieve the removal of biodegradable pollutants such as organic matter, nitrogen, and phosphorus.

[0049] This integrated device includes anoxic (denitrification) biochemical treatment, aerobic (nitrification) biochemical treatment, solid-liquid separation (sedimentation), sludge return, and mixed liquor return. The complete process flow is as Figure 1 shown:

[0050] The water to be treated (influent) flows into the anoxic zone for treatment, then flows into the aerobic zone and is pumped into the sedimentation zone by an air lift pump. The sludge after sedimentation in the sedimentation zone is returned to the anoxic zone, and the separated effluent flows out through the outlet. In this embodiment, in the anoxic zone, for nitrogen-containing wastewater, denitrifying bacteria use organic matter to convert nitrate nitrogen into nitrogen gas to remove nitrate nitrogen. For medium and high-concentration organic wastewater, the anoxic zone can also hydrolyze organic macromolecular substances into small molecules that are easily biodegradable.

[0051] In the aerobic zone, for organic wastewater and ammonia-nitrogen-containing wastewater, the organic matter in the wastewater is degraded into carbon dioxide and water, and (sub)nitrifying bacteria are used to convert ammonia nitrogen into (sub)nitrate nitrogen. In the sedimentation zone, the effluent treated in the aerobic zone is lifted to the sedimentation system in the sedimentation zone by a sludge return air lift pump. To prevent the effluent from carrying air and affecting the sedimentation effect, an air-liquid separation tank is set in front of the sedimentation zone. There are multiple fences in the air-liquid separation tank, which can continuously change the water flow direction to form a turbulent flow and release bubbles. To improve the sedimentation effect or remove phosphorus, flocculants or phosphorus-removing agents can also be added in front of the fences.

[0052] The integrated sedimentation built-in deep water aeration bioreactor includes an anoxic zone, an aerobic zone and a sedimentation zone. The anoxic zone is arranged below the sedimentation zone, and the anoxic zone and the aerobic zone are connected through a communication port at the lower part of the equipment; the aerobic zone is arranged on the periphery of the anoxic zone and the sedimentation zone. In the aerobic zone, a flexible perforated aeration pipe is configured for aeration. The pool depth of 10 - 15m greatly improves the dissolved oxygen efficiency of the perforated aeration pipe, and generally the dissolved oxygen can reach more than 20%. There are two air-lift pumps for sludge reflux and mixed liquor reflux in the aerobic zone. After the mixed liquor of mud and water after aerobic biochemical treatment passes through the sludge reflux air-lift pump and the gas-liquid separation tank, it then enters the sedimentation zone through a spoke-type or ring-type water distribution device; the mixed liquor that needs to be refluxed is lifted to the mixed liquor gas-liquid separation tank through the mixed liquor reflux air-lift pump and then enters the anoxic zone. According to the water quality and quantity of the treatment object, biological fillers can be set in the aerobic zone. To accurately measure the reflux volume of sludge, a triangular weir or a rectangular weir can be set at the rear section of the gas-liquid separation tank, and the water volume entering the sedimentation zone can be accurately measured through a measuring scale or an ultrasonic level gauge. A stirrer is set in the anoxic zone; the refluxed mixed liquor and the equipment inlet water enter the anoxic zone through the central draft tube and the inlet ring. The central draft tube is located at the center of the sedimentation zone of this equipment, and the inlet ring is located at the upper peripheral part of the anoxic zone. There are evenly arranged water passing holes or water passing slits at the bottom of the inlet ring, which can evenly distribute the inlet water and the refluxed mixed liquor to the anoxic zone; to avoid short circuit flow, the inflow direction of the inlet ring is horizontal tangential; to avoid gas accumulation at the top of the anoxic zone, one or more vent pipes (or side wall draft tubes) are provided at the inlet ring and the barrel wall below the inlet ring, which can discharge the gas to the outside of the equipment to balance the water level in the anoxic zone; to avoid mud accumulation and blockage in the inlet ring, the inlet ring vent pipe can be connected to flushing water for flushing. To avoid the backflow of the mixed liquor in the anoxic zone to the sedimentation zone, a guide plate is provided at the reflux seam (opening) of the mud hopper in the sedimentation zone. A spoke-type or ring-type water distribution device is provided at the central part of the sedimentation zone, which can evenly distribute the mixed liquor of mud and water entering the sedimentation zone to the sedimentation zone. A water distribution bell mouth or a water distribution ring is arranged below the water distribution device, and the outlet direction of the water distribution bell mouth or the water distribution ring is obliquely downward. An outlet triangular weir plate is arranged above the sedimentation zone, and the water after solid-liquid separation flows out through the outlet triangular weir and enters the collection tank and is discharged. According to the water quality and quantity of the treatment object, inclined tube (plate) fillers can be set in the sedimentation zone. The excess sludge generated by biochemical treatment is discharged through the sludge discharge pipe in the mud hopper. The sludge in the sedimentation zone realizes sludge reflux by flowing into the anoxic zone by gravity, and the mixed liquor in the anoxic zone then flows into the aerobic zone by gravity. Therefore, the liquid level of the sedimentation zone is the highest, followed by the anoxic zone, and the liquid level of the aerobic zone is the lowest. The lifting of the mixed liquor in the aerobic zone into the sedimentation zone and the anoxic zone both need to be realized by using specially designed air-lift pumps.To avoid interference of the sedimentation zone by bubbles, before the mixed liquor enters the sedimentation zone, it first enters the sludge return gas-liquid separation tank; at the front end of the sludge return gas-liquid separation tank, there are multiple fences with an arc-shaped water-facing surface to keep the mixed liquor in a turbulent state; to avoid breakage of the sludge flocs and reduce the turbulence intensity, the gap ratios of the fences in the later stages are higher than those in the previous stages; at the rear end of the gas-liquid separation tank, a flow stabilizer plate, a triangular or rectangular metering tank are provided, and a liquid level scale or an ultrasonic liquid level gauge can be provided for metering when needed. According to the sedimentation condition of the sedimentation zone or the phosphorus removal requirement, a polymer flocculant or a phosphorus removal agent can be added at the front end of the gas-liquid separation tank. To avoid gas accumulation in the anoxic zone, before the mixed liquor enters the anoxic zone, it first enters the mixed liquor return gas-liquid separation tank. Similar to the sludge return gas-liquid separation tank, it is internally provided with a turbulent fence, a flow stabilizer plate, and a weir. A liquid level scale or an ultrasonic liquid level gauge can be provided when needed; when the reflux ratio is large, multiple sets of gas-liquid separation tanks can be set. The wastewater to be treated enters the gas-liquid separation tank at the rear end (behind the weir) of the mixed liquor gas-liquid separation tank, mixes with the mixed liquor and then enters the anoxic zone. This integrated sedimentation built-in deep water aeration bioreactor is also called an integrated sedimentation zone built-in deep water aeration bioreactor.

[0053] The following combines Figure 2 and Figure 3 to describe in detail the structure of the integrated sedimentation built-in deep water aeration bioreactor. Figure 2 It is a schematic front view cross-section of the bioreactor according to the embodiment of the present application. Figure 3 For Figure 2 the top view schematic of the bioreactor.

[0054] The influent ① first enters the rear end of the mixed liquor return gas-liquid separation tank 5a through the influent pipe, mixes with the returned mixed liquor, and then enters the anoxic zone ② through the influent ring 1 and the central draft tube 2 respectively. Under the agitation of the agitator 3, the wastewater comes into full contact with the anoxic microorganisms and denitrifying bacteria in the mixed liquor, and biochemical reactions occur. The organic matter and (nitrite) nitrate nitrogen in the wastewater are degraded, converted into small-molecule organic matter, and carbon dioxide, water, and nitrogen are generated. The reacted sludge and water enter the aerobic zone ③ through the connecting holes (not shown in the figure) at the bottom of the tank. In the aerobic zone, under the action of aerobic microorganisms and (nitrite) nitrifying bacteria, the organic matter is degraded into carbon dioxide and water, and ammonia nitrogen is converted into (nitrite) nitrate nitrogen; the water after aerobic biochemical treatment and the activated sludge are lifted by the sludge return air-lift pump 4b and enter the sludge return gas-liquid separation tank 5b. After separation to remove the gas, it is evenly distributed through the water distribution device 6 and enters the sedimentation zone ④. Solid-liquid separation is carried out in the sedimentation zone ④. The clarified water enters the effluent weir 7, then converges into the collection tank 8, and is discharged outside the bioreactor through the effluent ⑤. In this embodiment, the sludge sedimented in the sedimentation zone ④ returns to the anoxic zone ② through the return slit 9 at the lower part of the mud hopper by the action of gravity. In this embodiment, the mixed liquor in the aerobic zone ③ is lifted to the mixed liquor return gas-liquid separation tank 5a by the mixed liquor return air-lift pump 4a. After separation to remove the gas, the mixed liquor is air-lifted and mixed with the influent ①, and then enters the anoxic zone ② together. In this embodiment, the air ⑦ required for the aerobic zone ③ and the air ⑦ required for the air-lift pumps 4a / 4b are provided by an external air supply device (not shown in the figure). The air ⑦ entering the aerobic zone is diffused through the aeration device 10 to provide oxygen to the aerobic microorganisms in the aerobic zone ③; the excess sludge ⑥ sedimented in the sedimentation zone ④ is discharged through a sludge discharge pipe (not shown in the figure). In this embodiment, the sedimentation zone ④ is provided above the anoxic zone ②, and the aerobic zone ③ is provided outside the anoxic zone ② and the sedimentation zone ④. The anoxic zone ② is also provided with an agitator 3 (in other embodiments, according to the water quality and quantity of the treatment object, biological fillers can be set in the anoxic zone. At this time, the agitator can be omitted). The air-lift pumps 4a / 4b are provided in the aerobic zone ③, and the gas-liquid separation tanks 5 (5a / 5b) are provided at the top of the bioreactor. The central draft tube 2 and the water distribution device 6 are concentric structures and are located at the center of the bioreactor. The influent ring 1 is provided on the upper periphery of the anoxic zone. Preferably, a vent pipe or a side wall draft tube (not shown in the figure) is provided on the influent ring 1. In this embodiment, the sedimentation zone ④ is provided with a mud hopper, and the inclination angle of the mud hopper is greater than or equal to 60 degrees. A sludge return slit (orifice) is provided at the lower end of the mud hopper, and the sludge after solid-liquid separation returns to the anoxic zone through the return slit (orifice). The return slit (orifice) is inclined downward and extends for a certain length. Such a design avoids the possible bubbles in the anoxic zone from rising to the sedimentation zone and interfering with sedimentation. In other embodiments, a conical diversion device is provided below the return orifice to avoid the possible bubbles in the anoxic zone from rising to the sedimentation zone and interfering with sedimentation.In this embodiment, the center of the air-lift pump is the riser pipe, and the outer ring at the lower end is the air inlet box. Uniformly distributed small upwardly inclined air-distributing holes are provided inside the air inlet box to inject air into the riser pipe, so that the air and the mixed liquid are uniformly mixed.

[0055] This integrated sedimentation and in-depth aeration bioreactor ensures that the sludge hopper is not prone to mud accumulation and the return seam (opening) is not easily blocked through a large proportion of sludge reflux (about 3 - 4:1); the large proportion of mixed liquid reflux (about 5 - 40:1) ensures the removal rate of (nitrite) nitrate nitrogen and dilutes the toxic substances in the influent water at the same time.

[0056] In one embodiment, according to the water quality and quantity of the water to be treated, biological fillers 11 can be set in the anoxic zone and the aerobic zone, and inclined tube (plate) fillers 12 are set in the sedimentation zone (see Figure 4 ), and no agitator is set in the anoxic zone. The biological fillers 11 can be elastic fillers, combined fillers, suspended fillers, braided curtain fillers, etc. The other settings in the anoxic zone, aerobic zone and sedimentation zone are the same as those in Figure 2 the embodiment of

[0057] In one embodiment, as Figure 2 shown, according to the requirements of the site, an ORP meter, a dissolved oxygen meter, and a pH meter can be set in the anoxic zone ② and the aerobic zone ③. A flow meter is set on the air supply pipe of the air-lift pump 4, ultrasonic level gauges are respectively set on the measuring weirs of the air-liquid separation tank 5 for sludge reflux and mixed liquid reflux, and on-line COD, ammonia nitrogen, total nitrogen, and total phosphorus detectors are set at the outlet ⑤. The air supply fan adopts variable frequency control, so that intelligent and refined control can be realized, and the electricity cost and chemical agent cost can be saved to the greatest extent. An air flow meter, which is arranged on the air pipe for air-lift, is used to control the amount of the lifted mixed liquid, and a dissolved oxygen meter, which is arranged in the aerobic zone, is used to control the amount of air for aeration.

[0058] In one embodiment, as a Figure 2 variant of the Figure 5a embodiment, as Figure 5b shown, Figure 5a is the top view of Figure 2 . In this integrated sedimentation and in-depth aeration bioreactor 100, the sedimentation zone 120 is located above the anoxic zone 110 (and the center lines are the same), and the aerobic zone 130 surrounds the sedimentation zone 120 and the anoxic zone 110. The return seam / return opening is inclined downward and extends for a certain length. The integrated sedimentation and in-depth aeration bioreactor 100 is cylindrical, and the outer diameters of the sedimentation zone 120 and the anoxic zone 110 are the same or approximately the same. Other structures in this embodiment refer to Figure 3 the embodiment of

[0059] In one embodiment, as a Figure 2 variant of the Figure 8aAs shown Figure 8b is Figure 8a a top view of the integrated sedimentation built-in deep water aeration bioreactor 400. The sedimentation area 420 of the integrated sedimentation built-in deep water aeration bioreactor 400 is located above the anoxic area 410, and the upward view projection of the anoxic area 410 is within the area of the sedimentation area 420. The aerobic area 430 surrounds the sedimentation area 420 and the anoxic area 410. The integrated sedimentation built-in deep water aeration bioreactor 400 is cylindrical. The center a of the sedimentation area 420 is the same as that of the anoxic area 410. For other structures in the embodiment, refer to Figure 2 / Figure 3 the embodiment. The cross-section of the sedimentation area 420 is in the shape of two inverted eights

[0060] In one embodiment, as Figure 2 a variation of the embodiment is as shown in Figure 6a As shown Figure 6b is Figure 6a a top view of the integrated sedimentation built-in deep water aeration bioreactor 200. The sedimentation area 220 of the integrated sedimentation built-in deep water aeration bioreactor 200 is conical, and the sedimentation area 220 is located at the center of the bioreactor 200. The anoxic area 210 and the aerobic area 230 are arranged on the periphery of the sedimentation area 220, and the anoxic area 210 and the aerobic area 230 are provided according to the needs of the application occasion. The integrated sedimentation built-in deep water aeration bioreactor 200 is cylindrical (cylindrical). For other structures, refer to Figure 2 / Figure 3 the embodiment. As Figure 6a a variation of the embodiment, as shown in Figure 9a and 9b the embodiment, the cross-section of the bioreactor 500, the equipment is square. The sedimentation area 520 is located at the center of the bioreactor. The sedimentation area is conical, and the tip of the cone does not contact the bottom 501 of the bioreactor. The communication port is arranged on the partition plate 502 (not shown in the figure), and the anoxic area and the aerobic area are communicated through the communication port

[0061] In one embodiment, as Figure 2 a variation of the embodiment is as shown in Figure 7a As shown Figure 7b is Figure 7a a top view of the integrated sedimentation built-in deep water aeration bioreactor 300. The sedimentation area 320 of the integrated sedimentation built-in deep water aeration bioreactor 300 is located above the anoxic area 310, and the aerobic area 330 surrounds the sedimentation area 320 and the anoxic area 310. The integrated sedimentation built-in deep water aeration bioreactor 300 is cylindrical. The cross-section of the sedimentation area 320 is in the shape of two inverted eights. For other structures in this embodiment, refer to Figure 2 / Figure 3 the embodiment

[0062] The above embodiments are only for illustrating the technical concept and features of the present application, and the purpose is to enable those who are familiar with this technology to understand the content of the present application and implement it accordingly, and it cannot be used to limit the protection scope of the present application. All modifications made according to the spirit and essence of the main technical solution of the present application should be covered within the protection scope of the present application.

Claims

1. Integrated sedimentation built-in deep water aeration bioreactor, characterized in that, Comprising: An anoxic zone, an aerobic zone and a sedimentation zone, The sedimentation zone is arranged above the anoxic zone, and a sludge hopper is arranged therein for returning the precipitated sludge to the anoxic zone through an annular gap at the bottom of the sludge hopper, At least part of the aerobic zone surrounds the periphery of the anoxic zone and / or the sedimentation zone. An aeration device is arranged in the aerobic zone. The aeration device adopts a flexible perforated aeration pipe, and air outlet holes are arranged on the aeration pipe, and the air outlet holes are vertically and uniformly arranged downward, The anoxic zone is communicated with the aerobic zone through a communication port. The communication port is arranged at the bottom of the bioreactor. A plurality of the communication ports are uniformly arranged along the circumferential direction and avoid the air lift pump, The mixed liquid in the aerobic zone is lifted by an air lift pump and passes through a sludge return air-liquid separation tank and a spoke-shaped water distribution device to the sedimentation zone for solid-liquid separation. A plurality of fences and flow stabilizers with an arc-shaped water-facing surface are arranged in the sludge return air-liquid separation tank. The water after solid-liquid separation is discharged from the outlet through a weir, The mixed liquid returned from the aerobic zone to the anoxic zone is lifted by a mixed liquid air lift pump. The returned mixed liquid and the influent enter the anoxic zone through a central draft tube and an influent ring. The central draft tube is arranged at the center of the sedimentation zone, and the influent ring is located at the upper periphery of the anoxic zone. Uniformly arranged water passing holes or water passing slits are arranged at the bottom of the influent ring to uniformly distribute the influent and the returned mixed liquid to the anoxic zone.

2. The integrated sedimentation built-in deep water aeration bioreactor according to claim 1, wherein The sludge hopper is conical; a sludge return port is arranged on the lower side of the sludge hopper.

3. The integrated sedimentation built-in deep water aeration bioreactor according to claim 2, wherein A deflector is arranged at the return port, or A conical deflector device is arranged below the sludge return port, or The return port is inclined downward and extends for a certain length.

4. The integrated sedimentation built-in deep water aeration bioreactor according to claim 1, wherein, Comprising a sedimentation assembly, which is arranged in the sedimentation zone, The air lift pump lifts the mixed liquid in the aerobic zone to a sludge return air-liquid separation tank, which is arranged at the top of the bioreactor. Fences, flow stabilizers and a metering weir are arranged in the air-liquid separation tank. The mixed liquid enters a spoke-type water distribution device after passing through the air-liquid separation tank and is uniformly distributed to the sedimentation zone for solid-liquid separation.

5. The integrated sedimentation built-in deep water aeration bioreactor according to claim 4, wherein The water outlet of the water distribution device is a water distribution bell mouth or a water distribution ring.

6. The integrated sedimentation built-in deep water aeration bioreactor according to claim 4, characterized in that, The water after solid-liquid separation is discharged to a water collection tank through a weir arranged at the upper part of the sedimentation zone and is discharged through a discharge port.

7. The integrated sedimentation built-in deep water aeration bioreactor according to claim 1, wherein A stirring device is arranged in the anoxic zone, which uses mechanical stirring, and a vertical mixer or a submersible mixer is selected, and the pushing flow direction is downward.

8. The integrated sedimentation built-in deep water aeration bioreactor according to claim 4, wherein It further comprises: A liquid level gauge, which is arranged at the metering weir; An air flow meter, which is arranged on the air pipeline for air lift to control the amount of the lifted mixed liquid; A dissolved oxygen meter, which is arranged in the aerobic zone to control the amount of air for aeration.

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