Continuous-flow aerobic granular sludge reactor and wastewater treatment method thereof

Abstract

The application discloses a continuous-flow aerobic granular sludge reactor and a sewage treatment method thereof, and relates to the technical field of sewage treatment. The reactor body of the reactor is sequentially provided with a sedimentation zone, an aerobic zone and an anoxic adsorption zone from top to bottom. A three-phase separator is arranged in the sedimentation zone, a conical flow guide baffle is arranged between the aerobic zone and the anoxic adsorption zone, an annular microporous aeration pipe is arranged above the conical flow guide baffle, and aeration stones are arranged at the bottom of the anoxic adsorption zone. The combination of the anoxic adsorption zone, the hydraulic shear force of the aerobic zone and the sedimentation zone formed by the three-phase separator in the main body promotes the rapid formation of granular sludge, and at the same time, the stable and continuous retention of granular sludge is maintained when the continuous-flow effluent is running, and the flocculent light sludge is screened out. The reactor can maintain high-concentration MLSS, has strong impact load resistance, high volumetric load and good simultaneous nitrogen and phosphorus removal effect. The reactor realizes efficient treatment of pollutants, has large sewage treatment capacity, high equipment utilization rate, energy saving and cost reduction, and achieves the purpose of carbon reduction.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, specifically relates to a continuous flow aerobic granular sludge reactor and a sewage treatment method thereof. BACKGROUND

[0002] The aerobic granular sludge (AGS) is the granular activated sludge formed by the self-aggregation of microorganisms under specific environment. Compared with the ordinary activated sludge, it has the characteristics of not easy to cause sludge bulking, strong impact resistance, can withstand high organic load, and integrates different properties of microorganisms (aerobic, facultative and anaerobic microorganisms) in one. The self-aggregation process of microorganisms is a complex physical, chemical and biological process, and the granulation is affected by multiple environmental factors. At present, most of the research results of AGS technology come from the intermittent operation reactor, such as SBR, SBAR and other intermittent biological reactors, which are suitable for the treatment of small water quantity wastewater, and have low equipment utilization rate, large head loss, high degree of automation requirement, high operation, management, maintenance and personnel quality requirement, and are not easy to be connected with other continuous operation structures, which greatly limits the application and popularization of the technology. SUMMARY

[0003] To solve the above technical problems, the present application provides a continuous flow aerobic granular sludge reactor and a sewage treatment method thereof, specifically including the following technical solutions:

[0004] In the first aspect, a continuous flow aerobic granular sludge reactor is provided, which comprises a reactor body, and a sedimentation zone, an aerobic zone and an anoxic adsorption zone are sequentially arranged in the reactor body from top to bottom. A three-phase separator is arranged in the sedimentation zone, a conical flow guide baffle is arranged between the aerobic zone and the anoxic adsorption zone, an annular microporous aeration pipe is arranged above the conical flow guide baffle, and aeration stones are arranged at the bottom of the anoxic adsorption zone.

[0005] Preferably, the inner diameter of the conical flow guide baffle gradually increases from top to bottom.

[0006] Further, the three-phase separator comprises a first component and a second component, the first component is arranged on the top wall of the reactor body, and the second component is arranged on the side wall of the reactor body.

[0007] Further, an air pump is further included, one end of the air pump is connected with the aeration stones, and the other end of the air pump is connected with the annular microporous aeration pipe.

[0008] Further, a first aeration valve is arranged between the air pump and the aeration stones, and a second aeration valve is arranged between the air pump and the annular microporous aeration pipe.

[0009] Preferably, a first check valve is arranged between the air pump and the aeration stone, and a second check valve is arranged between the air pump and the annular micro-porous aeration pipe.

[0010] Further, the bottom of the reactor body is provided with a water inlet, the sidewall of the reactor body is provided with a water outlet and an intermittent water outlet, the water outlet is arranged in the sedimentation zone, and the intermittent water outlet is arranged in the aerobic zone.

[0011] Further, the water regulating tank is connected to the water inlet, and a water inlet peristaltic pump is arranged between the water regulating tank and the water inlet.

[0012] Further, the sedimentation water tank is connected to the water outlet.

[0013] Preferably, the upper portion of the sedimentation water tank is provided with a water outlet.

[0014] Further, the water outlet is provided in a plurality of forms, and each water outlet is connected to the same sedimentation water tank.

[0015] Further, the inner diameter of the anoxic adsorption zone gradually decreases from top to bottom.

[0016] In the second aspect, a sewage treatment method using the continuous-flow aerobic granular sludge reactor is provided, and the method comprises the following steps:

[0017] S1. Water inlet: the sewage to be treated enters the reactor body, the intermittent water outlet is opened for water discharge, and the water exchange ratio of the water inlet is controlled to be 50-55%;

[0018] S2. Anoxic adsorption: after the water inlet, anoxic adsorption is performed for 0.9-1h;

[0019] S3. Aeration: the aeration stone is opened for aeration, and the aeration time is 2.6-3h;

[0020] S4. Sedimentation: the sedimentation time is 5-30min;

[0021] S5. Water discharge: the intermittent water outlet is opened for water discharge, and the water exchange ratio of the water discharge is controlled to be 50-55%;

[0022] S6. Continuous water inlet-continuous water outlet: the aeration stone is closed, the annular micro-porous aeration pipe is opened for aeration, the dissolved oxygen concentration in the aerobic zone is controlled to be 2-4mg / L, and the dissolved oxygen concentration in the anoxic adsorption zone is controlled to be 0.5-1mg / L.

[0023] Compared with the prior art, the method has the following beneficial effects:

[0024] The combination of the anoxic adsorption zone, the hydraulic shear force of the aerobic zone and the sedimentation zone formed by the three-phase separator in the main body promotes the rapid formation of granular sludge, while maintaining the stable and continuous retention of granular sludge and the screening of flocculent light sludge during the continuous effluent operation; the reactor can maintain high concentration of MLSS, has strong impact load resistance, high volumetric load, good simultaneous nitrogen and phosphorus removal effect; realizes efficient treatment of pollutants, has large sewage treatment capacity, high equipment utilization rate, energy saving and cost reduction, and achieves the purpose of carbon reduction. By setting multiple water outlets, the different hydraulic retention times of the sedimentation zone in the continuous flow mode operation are controlled; compared with the existing intermittent operation reactor, the aerobic granular sludge technology can realize continuous flow operation, optimize the operation conditions and operation procedures, improve the equipment utilization efficiency, and run more stably, thereby promoting the popularization and application of aerobic granular sludge. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 It is a structural schematic diagram of a continuous-flow aerobic granular sludge reactor according to an embodiment of the present application.

[0027] Explanation of symbols in the figure:

[0028] 1-anoxic adsorption zone; 2-aerobic zone; 3-sedimentation zone; 4-inlet; 5-aeration stone; 6-conical flow guide baffle; 7-ring-shaped microporous aeration pipe; 8-intermittent water outlet; 9-first component; 10-second component; 11-water outlet; 12-adjustment water tank; 13-inlet peristaltic pump; 14-air pump; 15-first aeration valve; 16-second aeration valve; 17-first check valve; 18-second check valve; 19-sedimentation water tank; 20-drainage port. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0030] In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] In the description of the present application, it is necessary to point out that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0032] The terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] Please refer to Figure 1The continuous flow aerobic granular sludge reactor comprises a reactor body, a sedimentation zone 3, an aerobic zone 2 and an anoxic adsorption zone 1 arranged in the reactor body from top to bottom, a three-phase separator arranged in the sedimentation zone 3, a conical flow guide baffle 6 arranged between the aerobic zone 2 and the anoxic adsorption zone 1, and an aeration stone 5 arranged at the bottom of the anoxic adsorption zone 1. The inner diameter of the conical flow guide baffle 6 gradually increases from top to bottom. The bottom of the reactor body is provided with a water inlet 4. The reactor further comprises an adjusting water tank 12 connected to the water inlet 4, and a water inlet peristaltic pump 13 arranged between the adjusting water tank 12 and the water inlet 4. The water inlet peristaltic pump 13 pumps the sewage to be treated in the adjusting water tank 12 to the water inlet 4, and the sewage to be treated enters the anoxic adsorption zone 1 from the water inlet 4. The inner diameter of the anoxic adsorption zone 1 gradually decreases from top to bottom. The aeration stone 5 intermittently aerates and mixes the adsorbed granular sludge, thereby assisting the granular sludge to rise. The conical flow guide baffle 6 at the upper part of the anoxic adsorption zone 1 is used to collect the intercepted granular sludge in the anoxic adsorption zone 1, maintain a high concentration of granular sludge, and promote the upflow and sedimentation of the granular sludge. An annular microporous aeration pipe 7 is arranged above the conical flow guide baffle 6. The reactor further comprises an air pump 14, one end of which is connected to the aeration stone 5 and the other end of which is connected to the annular microporous aeration pipe 6. A first aeration valve 15 is arranged between the air pump 14 and the aeration stone 5, and a second aeration valve 16 is arranged between the air pump 14 and the annular microporous aeration pipe 7. A first check valve 17 is arranged between the air pump 14 and the aeration stone 5, and a second check valve 18 is arranged between the air pump 14 and the annular microporous aeration pipe 7. The granular sludge in the aerobic zone 2 is mixed by aeration through the annular microporous aeration pipe 7, thereby providing the aerobic zone 2 with dissolved oxygen and hydraulic shear force, bringing the granular sludge in the anoxic adsorption zone 1 into the aerobic zone 2, and then the granular sludge falls from around the conical flow guide baffle 6 to the anoxic adsorption zone 1 to form a cycle (anoxic-aerobic-anoxic). An intermittent water outlet 8 is arranged on the side wall of the reactor body, and the intermittent water outlet 8 is arranged in the aerobic zone 2. The three-phase separator comprises a first component 9 and a second component 10, the first component 9 is arranged on the top wall of the reactor body, and the second component 10 is arranged on the side wall of the reactor body. In this embodiment, the number of the second component 10 is two, which are arranged on opposite sides of the side wall of the reactor body. The sedimentation zone 3 is located between the first component 9 and the side wall of the reactor body. The bubbles generated in the aerobic zone 2 are deflected to the center and then discharged upward in the vertical direction due to the blocking of the second component 10. The mud-water mixture enters the area between the first component 9 and the side wall of the reactor body, i.e. the sedimentation zone 3, through the gap between the first component 9 and the second component 10. Since there is no aeration mixing in the sedimentation zone 3, the granular sludge falls from the gap between the first component 9 and the second component 10 to the aerobic zone. The side wall of the reactor body is provided with a water outlet 11, and the water outlet 11 is arranged in the sedimentation zone 3. The water meeting the standard is discharged from the water outlet 11.The height of the water outlet 11 determines the volume of the sedimentation zone 3, and under the condition of a certain water inflow, the volume of the sedimentation zone 3 determines the hydraulic retention time of the water inflow in the zone, thereby performing hydraulic screening on the sludge; the light-mass flocculent sludge is screened out with the water outflow by controlling the length of the hydraulic retention time through controlling the height of the water outlet 11, and the heavy-mass granular sludge is settled back to the aerobic zone. The reactor further comprises a sedimentation water tank 19 connected to the water outlet 11. The water outlet 11 is in plurality, and each water outlet 11 is communicated with the same sedimentation water tank 19. The upper portion of the sedimentation water tank 19 is provided with a water outlet 20, and the sewage treated by the reactor body is sent to the sedimentation water tank 19 for sedimentation, and the relatively clear water is discharged from the water outlet 20.

[0034] A sewage treatment method using a continuous-flow aerobic granular sludge reactor, which is based on the above-mentioned reactor and is completed by starting with flocculent sludge, operating the reactor in an intermittent mode (SBR) to granulate the flocculent sludge in the reactor, taking "water inflow-anoxic adsorption-aeration-sedimentation-water discharge" as one operation cycle, performing hydraulic screening on the sludge, discharging the light-mass flocculent sludge with the water outflow, and settling the heavy-mass granular sludge to remain in the lower portion of the reactor. After the water discharge is completed, the next cycle is entered. After the SBR mode operation is performed until the sludge is completely granulated, the continuous water inflow-continuous water outflow mode is converted. The method comprises the following steps:

[0035] S1. Water inflow: the sewage to be treated is introduced into the reactor body, the initial sludge concentration in the reactor body is 5000 mg / L, the intermittent water outlet is opened for water discharge, and the water replacement ratio of the water inflow is controlled to be 50%, that is, half of the volume of water in the reactor body is discharged.

[0036] S2. Anoxic adsorption: after the water inflow, anoxic adsorption is performed for 0.9-1 h.

[0037] S3. Aeration: after the anoxic adsorption is completed, the aeration stone is opened for aeration, the aeration time is 2.6-3 h, and the apparent upward gas velocity in the entire reactor body is controlled to be above 1.2 cm / s.

[0038] S4. Sedimentation: after the aeration is completed, sedimentation is performed, the sedimentation time is 5-30 min, and the sedimentation time is gradually shortened;

[0039] S5. Water discharge: after the sedimentation is completed, the intermittent water outlet is opened for water discharge, and the water replacement ratio of the water discharge is controlled to be 50%, that is, half of the volume of water in the reactor body is discharged.

[0040] S6. Continuous water inlet-continuous water outlet: close the aeration stone, open the annular micro-porous aeration pipe for aeration, provide dissolved oxygen and hydraulic shear force for the aerobic zone, control the dissolved oxygen concentration of the aerobic zone to be 2-4 mg / L, and the dissolved oxygen concentration of the anoxic adsorption zone to be 0.5-1 mg / L. This process brings the granular sludge in the anoxic adsorption zone into the aerobic zone, and then the granular sludge falls from the four sides of the conical guide baffle to the anoxic adsorption zone to form a cycle (anoxic-aerobic-anoxic-); the treated water in the aerobic zone is discharged from the reactor outlet to the sedimentation tank through the three-phase separator and the sedimentation zone; the relatively clear water is discharged from the top of the sedimentation tank after 1h of hydraulic retention for sedimentation, and thus the process is completed.

[0041] The continuous flow aerobic granular sludge reactor and the sewage treatment method thereof provided by the application promote the rapid formation of granular sludge by the combination of the anoxic adsorption zone, the hydraulic shear force of the aerobic zone and the sedimentation zone formed by the three-phase separator in the main body, and the granular sludge is stably and continuously retained while the flocculent light sludge is screened out during the continuous water flow operation; the reactor can maintain a high concentration of MLSS, has strong impact load resistance, high volumetric load and good simultaneous nitrogen and phosphorus removal effect; the efficient treatment of pollutants is realized, the sewage treatment capacity is large, the equipment utilization rate is high, energy is saved and cost is reduced, and the purpose of carbon reduction is achieved.

[0042] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0043] The above is only a specific implementation of the application, but the protection scope of the application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the application, and these modifications or replacements should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A continuous flow aerobic granular sludge reactor, comprising a reactor body, characterized in that: The reactor body is equipped with a sedimentation zone, an aerobic zone and an anoxic adsorption zone from top to bottom. A three-phase separator is installed in the sedimentation zone. A conical guide baffle is installed between the aerobic zone and the anoxic adsorption zone. An annular microporous aeration pipe is installed above the conical guide baffle. An aeration stone is installed at the bottom of the anoxic adsorption zone. The three-phase separator includes a first component and a second component, the first component is arranged on the top wall of the reactor body, and the second component is arranged on the side wall of the reactor body; It also includes an air pump, one end of the air pump is connected to the aeration stone, and the other end is connected to the annular microporous aeration pipe; A first aeration valve is provided between the air pump and the aeration stone, and a second aeration valve is provided between the air pump and the annular microporous aeration pipe; the inner diameter of the conical guide baffle increases gradually from top to bottom.

2. The continuous flow aerobic granular sludge reactor according to claim 1, characterized in that: The bottom of the reactor body is provided with a water inlet, and the side wall of the reactor body is provided with a water outlet and an intermittent water outlet. The water outlet is arranged in the sedimentation zone, and the intermittent water outlet is arranged in the aerobic zone.

3. The continuous flow aerobic granular sludge reactor according to claim 2, characterized in that: It also includes a regulating water tank, which is connected to the water inlet, and a water inlet peristaltic pump is provided between the regulating water tank and the water inlet.

4. The continuous flow aerobic granular sludge reactor according to claim 3, characterized in that: It also includes a sedimentation water tank, which is connected to the water outlet.

5. The continuous flow aerobic granular sludge reactor according to claim 4, characterized in that: There are multiple water outlets, and each water outlet is connected to the same sedimentation water tank.

6. The continuous flow aerobic granular sludge reactor according to claim 5, characterized in that: The inner diameter of the oxygen-deficient adsorption zone gradually decreases from top to bottom.

7. A method for treating sewage using the continuous flow aerobic granular sludge reactor according to any one of claims 2 to 6, characterized in that: The following steps are involved: S1. Water inlet: The treated sewage enters the reactor body, the intermittent water outlet is opened for drainage, and the water exchange ratio of the inlet is controlled at 50-55%; S2. Anoxic adsorption: After entering the water, perform anoxic adsorption for 0.9-1h; S3. Aeration: Open the aeration stone for aeration, the aeration time is 2.6-3 hours; S4. Precipitation: Precipitation time is 5-30 min; S5. Drainage: Open the intermittent water outlet to drain water, and control the water exchange ratio of drainage to 50-55%; S6. Continuous water inflow and outflow: Close the aeration stone and open the annular microporous aeration tube for aeration. Control the dissolved oxygen concentration in the aerobic zone to 2-4 mg / L and the dissolved oxygen concentration in the anoxic adsorption zone to 0.5-1 mg / L.

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