A combined reaction device for culturing aerobic granular sludge and its operation method

Abstract

A combined reaction device for cultivating aerobic granular sludge and its operation method, comprising a reactor main body. The reactor main body includes four air-lift internal circulation reactors, and each air-lift internal circulation reactor is respectively provided with a water inlet, an aeration head, a sludge discharge port and a water outlet. The aeration head of the air-lift internal circulation reactor is communicated with an aeration system; the reactor main body includes four operation stages, and each operation stage includes three processes: water inlet, aerobic closed aeration and sedimentation water outlet. The four air-lift internal circulation reactors operate symmetrically and alternately in each operation stage. This device can in-situ cultivate activated sludge into aerobic granular sludge, taking into account the continuous flow and non-intermittent operation characteristics, and is not easy to damage the particle structure when air-lifting and refluxing sludge.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a combined reaction device for culturing aerobic granular sludge and an operation method thereof. Background Art

[0002] Aerobic granular sludge (AGS) is a new environmental biotechnology, which has the advantages of regular shape, good sedimentation performance, stable structure, high biomass and high biological activity. At the same time, it can make the structure of sewage treatment structures compact and reduce the floor area, and has attracted much attention from researchers in recent years. During the granulation process of aerobic granular sludge, microorganisms first aggregate to form flocs, and then the flocs gradually form aerobic granular sludge with larger particle size, compact structure and regular shape. This process involves the comprehensive influence of various forces such as hydraulic shear force, thermodynamic action and van der Waals force. The sequencing batch reactor (SBR) can provide sufficient hydraulic shear force and nutrient conditions with rich and poor alternation. Therefore, the combined process of AGS technology and high-column SBR has always been a research hotspot. Developing a combined reactor that takes into account the advantages of SBR configuration and the characteristics of continuous flow operation has potential application and promotion value. Summary of the Invention

[0003] In order to solve the current technical problems, the main object of the present invention is to provide a combined reaction device and an operation method for culturing aerobic granular sludge. This device can in-situ culture activated sludge into aerobic granular sludge, taking into account the characteristics of continuous flow operation without interruption, and is not easy to damage the particle structure when air-lifting and refluxing sludge.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a combined reaction device for culturing aerobic granular sludge, including a reactor main body, the reactor main body includes four air-lift internal circulation reactors, and the air-lift internal circulation reactors are respectively provided with a water inlet, an aeration head, a sludge discharge port and a water outlet. The aeration heads of the air-lift internal circulation reactors are communicated with an aeration system; the reactor main body includes four operation stages, and each operation stage includes three processes: water inlet, aerobic blanketing aeration and sedimentation and water discharge. The four air-lift internal circulation reactors operate symmetrically and alternately in each operation stage.

[0005] The four air-lift internal circulation reactors include a first air-lift internal circulation reactor, a second air-lift internal circulation reactor, a third air-lift internal circulation reactor and a fourth air-lift internal circulation reactor; the pipeline connection of the four air-lift internal circulation reactors in the first operation stage is as follows:

[0006] The water inlet of the first air-lift internal circulation reactor is communicated with a water inlet system;

[0007] The water outlet of the first air-lift internal circulation reactor is respectively communicated with the water inlets of the second air-lift internal circulation reactor and the fourth air-lift internal circulation reactor;

[0008] The water outlets of the second stripping internal circulation reactor and the fourth stripping internal circulation reactor are both connected to the water inlet of the third stripping internal circulation reactor;

[0009] The water outlet of the third stripping internal circulation reactor is connected to the water outlet system.

[0010] Among them, the pipeline connections of the four stripping internal circulation reactors in the second operation stage are as follows:

[0011] The water inlet of the second stripping internal circulation reactor is connected to the water inlet system;

[0012] The water outlet of the second stripping internal circulation reactor is respectively connected to the water inlets of the first stripping internal circulation reactor and the third stripping internal circulation reactor;

[0013] The water outlets of the first stripping internal circulation reactor and the third stripping internal circulation reactor are both connected to the water inlet of the fourth stripping internal circulation reactor;

[0014] The water outlet of the fourth stripping internal circulation reactor is connected to the water outlet system.

[0015] Among them, the pipeline connections of the four stripping internal circulation reactors in the third operation stage are as follows:

[0016] The water inlet of the third stripping internal circulation reactor is connected to the water inlet system;

[0017] The water outlet of the third stripping internal circulation reactor is respectively connected to the water inlets of the second stripping internal circulation reactor and the fourth stripping internal circulation reactor;

[0018] The water outlets of the second stripping internal circulation reactor and the fourth stripping internal circulation reactor are both connected to the water inlet of the first stripping internal circulation reactor;

[0019] The water outlet of the first stripping internal circulation reactor is connected to the water outlet system.

[0020] Among them, the pipeline connections of the four stripping internal circulation reactors in the fourth operation stage are as follows:

[0021] The water inlet of the fourth stripping internal circulation reactor is connected to the water inlet system;

[0022] The water outlet of the fourth stripping internal circulation reactor is respectively connected to the water inlets of the first stripping internal circulation reactor and the third stripping internal circulation reactor;

[0023] The water outlets of the first stripping internal circulation reactor and the third stripping internal circulation reactor are both connected to the water inlet of the second stripping internal circulation reactor;

[0024] The water outlet of the second stripping internal circulation reactor is connected to the water outlet system.

[0025] It also includes a PLC control system, which is electrically connected to the air-lift internal circulation reactor, the influent system, the aeration system, and the effluent system for control.

[0026] During the circulation process, sewage continuously enters the air-lift internal circulation reactor, and each air-lift internal circulation reactor periodically operates under aerobic or anaerobic conditions, forming an alternating nutritional condition of feast and famine periods in terms of time and space.

[0027] During the influent process and / or the aerobic blanking process, the aeration system of the air-lift internal circulation reactor remains open to provide the circulation power, hydraulic shear force, and dissolved oxygen of the granular sludge; during the sedimentation and effluent process, the aeration system of the air-lift internal circulation reactor remains closed.

[0028] The total operation cycle of the three processes of influent, aerobic blanking, and sedimentation and effluent is T, and the operation duration of each process is adjustable; among them, the duration of the influent process is set as T1, the duration of the aerobic blanking process is set as T2, and the duration of the aerobic blanking process is set as T3.

[0029] An operation method of a combined reaction device for culturing aerobic granular sludge, which is used for in-situ culturing of aerobic granular sludge, specifically includes the following steps:

[0030] S1. Sewage enters the reactor from the influent port at the bottom of the first air-lift internal circulation reactor via the influent system. At this time, the aeration system of the first air-lift internal circulation reactor is open, the sludge discharge port is closed, and the effluent system is open;

[0031] The sewage is evenly distributed to the second air-lift internal circulation reactor and the fourth air-lift internal circulation reactor. At this time, the aeration systems of the second air-lift internal circulation reactor and the fourth air-lift internal circulation reactor are open, the sludge discharge ports are closed, and the effluent systems are open;

[0032] The sewage enters the third air-lift internal circulation reactor from the effluent systems of the second air-lift internal circulation reactor and the fourth air-lift internal circulation reactor. At this time, the aeration system of the third air-lift internal circulation reactor is closed, the sludge discharge port is open, and the effluent system is open;

[0033] S2. Sewage enters the reactor from the influent port at the bottom of the second air-lift internal circulation reactor via the influent system. At this time, the aeration system of the second air-lift internal circulation reactor is open, the sludge discharge port is closed, the sludge discharge port is closed, and the effluent system is open;

[0034] The sewage is evenly distributed to the first air-lift internal circulation reactor and the third air-lift internal circulation reactor. At this time, the aeration systems of the first air-lift internal circulation reactor and the third air-lift internal circulation reactor are open, the sludge discharge ports are closed, and the effluent systems are open;

[0035] The sewage enters the fourth air-lift internal circulation reactor from the effluent systems of the first air-lift internal circulation reactor and the third air-lift internal circulation reactor. At this time, the aeration system of the fourth air-lift internal circulation reactor is closed, the sludge discharge port is opened, and the effluent system is opened.

[0036] S3. The sewage enters the reactor through the inlet pipe at the bottom of the third air-lift internal circulation reactor via the inlet system. At this time, the aeration system of the third air-lift internal circulation reactor is opened, the sludge discharge port is closed, and the effluent system is opened.

[0037] The sewage is evenly distributed to the second air-lift internal circulation reactor and the fourth air-lift internal circulation reactor. At this time, the aeration systems of the second air-lift internal circulation reactor and the fourth air-lift internal circulation reactor are opened, the sludge discharge ports are closed, and the effluent systems are opened.

[0038] The sewage enters the first air-lift internal circulation reactor from the effluent systems of the second air-lift internal circulation reactor and the fourth air-lift internal circulation reactor. At this time, the aeration system of the first air-lift internal circulation reactor is closed, the sludge discharge port is opened, and the effluent system is opened.

[0039] S4. The sewage enters the reactor through the inlet pipe at the bottom of the fourth air-lift internal circulation reactor via the inlet system. At this time, the aeration system of the fourth air-lift internal circulation reactor is opened, the sludge discharge port is closed, and the effluent system is opened.

[0040] The sewage is evenly distributed to the first air-lift internal circulation reactor and the third air-lift internal circulation reactor. At this time, the aeration systems of the first air-lift internal circulation reactor and the third air-lift internal circulation reactor are opened, the sludge discharge ports are closed, and the effluent systems are opened.

[0041] The sewage enters the second air-lift internal circulation reactor from the effluent systems of the first air-lift internal circulation reactor and the third air-lift internal circulation reactor. At this time, the aeration system of the second air-lift internal circulation reactor is closed, the sludge discharge port is opened, and the effluent system is opened.

[0042] The present invention has the following beneficial effects:

[0043] 1. The air-lift internal circulation reactor is a form of the sequencing batch reactor (SBR). The present invention retains the advantages of the sequencing batch reactor in terms of device structure and at the same time takes into account the requirement of continuous uninterrupted water inlet.

[0044] 2. The present invention uses a symmetric operation mode to ensure that each air-lift internal circulation reactor is periodically under aerobic or anaerobic conditions, forming a nutritional condition with alternating feast and famine periods in terms of time and space, providing a suitable environment for the granulation process of aerobic granular sludge.

[0045] 3. The present invention uses the air-lift internal circulation method to return sludge, eliminates the setting of sludge return pumps, is not easy to damage the structure of granular sludge, and at the same time maintains a certain sludge concentration in the reactor.

[0046] 4. The present invention ensures a strong hydraulic shear force in the reactor by setting a cylindrical configuration. While continuously supplying oxygen to the reactor using a micro - blower with a small power, it can provide the circulation power, hydraulic shear force, and dissolved oxygen required for the formation of aerobic granular sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The present invention will be further described below in conjunction with the drawings and embodiments.

[0048] Figure 1 It is a schematic structural diagram of an air - lift internal circulation reactor.

[0049] Figure 2 It is a block diagram of four operating stages of the present invention.

[0050] Figure 3 It is a schematic diagram of pipeline connection in the first operating stage of the present invention.

[0051] Figure 4 It is a schematic diagram of pipeline connection in the second operating stage of the present invention.

[0052] Figure 5 It is a schematic diagram of pipeline connection in the third operating stage of the present invention.

[0053] Figure 6 It is a schematic diagram of pipeline connection in the fourth operating stage of the present invention.

[0054] In the figure:

[0055] Air - lift internal circulation reactor 10, water inlet 11, aeration head 12, sludge discharge port 13, water outlet 14, water inlet system 20, aeration system 30, air valve 31, aeration pump 32, water outlet system 40;

[0056] First air - lift internal circulation reactor R1, second air - lift internal circulation reactor R2, third air - lift internal circulation reactor R3, fourth air - lift internal circulation reactor R4. DETAILED DESCRIPTION OF THE INVENTION

[0057] Example 1:

[0058] See Figures 1-6As shown in the figure, a combined reaction device for cultivating aerobic granular sludge includes a reactor main body, and the reactor main body includes four air-lift internal circulation reactors 10. Each air-lift internal circulation reactor 10 is respectively provided with a water inlet 11, an aeration head 12, a sludge discharge port 13 and a water outlet 14. The aeration head 12 of the air-lift internal circulation reactor 10 is communicated with an aeration system 30; the reactor main body includes four operation stages, and each operation stage includes three processes: water inlet, aerobic blanking aeration, and sedimentation and water outlet. The four air-lift internal circulation reactors 10 operate symmetrically and alternately in each operation stage. This device can in-situ cultivate activated sludge into aerobic granular sludge, taking into account the continuous flow and non-intermittent operation characteristics, and it is not easy to damage the particle structure when air-lifting and refluxing sludge.

[0059] Specifically, the four air-lift internal circulation reactors 10 include a first air-lift internal circulation reactor R1, a second air-lift internal circulation reactor R2, a third air-lift internal circulation reactor R3 and a fourth air-lift internal circulation reactor R4.

[0060] Among them, referring to Figure 2 、 3 , the pipeline connections of the four air-lift internal circulation reactors 10 in the first operation stage are as follows:

[0061] The water inlet 11 of the first air-lift internal circulation reactor R1 is communicated with a water inlet system 20;

[0062] The water outlet 14 of the first air-lift internal circulation reactor R1 is respectively communicated with the water inlets 11 of the second air-lift internal circulation reactor R2 and the fourth air-lift internal circulation reactor R4;

[0063] The water outlets 14 of the second air-lift internal circulation reactor R2 and the fourth air-lift internal circulation reactor R4 are both communicated with the water inlet 11 of the third air-lift internal circulation reactor R3;

[0064] The water outlet 14 of the third air-lift internal circulation reactor R3 is communicated with a water outlet system 40.

[0065] Furthermore, referring to Figure 2 、 4 , the pipeline connections of the four air-lift internal circulation reactors 10 in the second operation stage are as follows:

[0066] The water inlet 11 of the second air-lift internal circulation reactor R2 is communicated with a water inlet system 20;

[0067] The water outlet 14 of the second air-lift internal circulation reactor R2 is respectively communicated with the water inlets 11 of the first air-lift internal circulation reactor R1 and the third air-lift internal circulation reactor R3;

[0068] The water outlets 14 of the first air-lift internal circulation reactor R1 and the third air-lift internal circulation reactor R3 are both connected to the water inlet 11 of the fourth air-lift internal circulation reactor R4;

[0069] The water outlet 14 of the fourth air-lift internal circulation reactor R4 is connected to the water outlet system 40.

[0070] Furthermore, referring to Figure 2 、 5 In the third operation stage, the pipeline connections of the four air-lift internal circulation reactors 10 are as follows:

[0071] The water inlet 11 of the third air-lift internal circulation reactor R3 is connected to the water inlet system 20;

[0072] The water outlet 14 of the third air-lift internal circulation reactor R3 is respectively connected to the water inlets 11 of the second air-lift internal circulation reactor R2 and the fourth air-lift internal circulation reactor R4;

[0073] The water outlets 14 of the second air-lift internal circulation reactor R2 and the fourth air-lift internal circulation reactor R4 are both connected to the water inlet 11 of the first air-lift internal circulation reactor R1;

[0074] The water outlet 14 of the first air-lift internal circulation reactor R1 is connected to the water outlet system 40.

[0075] Furthermore, referring to Figure 2 、 6 In the fourth operation stage, the pipeline connections of the four air-lift internal circulation reactors 10 are as follows:

[0076] The water inlet 11 of the fourth air-lift internal circulation reactor R4 is connected to the water inlet system 20;

[0077] The water outlet 14 of the fourth air-lift internal circulation reactor R4 is respectively connected to the water inlets 11 of the first air-lift internal circulation reactor R1 and the third air-lift internal circulation reactor R3;

[0078] The water outlets 14 of the first air-lift internal circulation reactor R1 and the third air-lift internal circulation reactor R3 are both connected to the water inlet 11 of the second air-lift internal circulation reactor R2;

[0079] The water outlet 14 of the second air-lift internal circulation reactor R2 is connected to the water outlet system 40.

[0080] The four air-lift internal circulation reactors adopt a periodic symmetric operation mode, ensuring that each air-lift internal circulation reactor is periodically in aerobic or anaerobic conditions, forming a nutritional condition with alternating abundance and starvation periods in time and space, and eliminating the sludge return system.

[0081] Furthermore, in the air-lift internal circulation reactor, the cross-sectional area of the up-flow region is set to be substantially the same as that of the down-flow region. While continuously supplying oxygen to the reactor using a small-power micro fan, it can provide the circulation power, hydraulic shear force, and dissolved oxygen required for aerobic granular sludge.

[0082] In this embodiment, preferably, the effective volume of a single air-lift internal circulation reactor is 4 L.

[0083] Preferably, four air-lift internal circulation reactors operate in a periodic symmetric mode. The specifications of the inlet peristaltic pump in the inlet system 20 and the outlet peristaltic pump in the outlet system 40 are both 3 L / h.

[0084] Preferably, each air-lift internal circulation reactor 10 is provided with one aeration head 12 with a diameter of 20 mm and one aeration pump 32 with a flow rate of 5 L / min.

[0085] Preferably, a water inlet pipe with a diameter of 10 mm is set as the water inlet 11 at a height of 50 mm from the bottom of the reactor pool; a water outlet pipe with a diameter of 10 mm is set as the water outlet 14 at a height of 30 mm from the bottom of the collection tank; a sludge discharge pipe with a diameter of 20 mm is set as the sludge discharge port 13 at a height of 25 mm from the bottom of the reactor pool, and a valve can be set on the sludge discharge pipe.

[0086] During the circulation process, sewage continuously enters the air-lift internal circulation reactor 10. Each air-lift internal circulation reactor 10 is periodically under aerobic or anaerobic conditions, forming a nutritional condition with alternating feast and famine periods in terms of time and space.

[0087] During the water inlet process and / or the aerobic blanking process, the aeration system 30 of the air-lift internal circulation reactor 10 remains open to provide the circulation power, hydraulic shear force, and dissolved oxygen for the granular sludge; during the sedimentation and water outlet process, the aeration system 30 of the air-lift internal circulation reactor 10 remains closed.

[0088] The total operation cycle of the three processes of water inlet, aerobic blanking, and sedimentation and water outlet is T, and the operation duration of each process is adjustable; among them, the duration of the water inlet process is set as T1, the duration of the aerobic blanking process is set as T2, and the duration of the aerobic blanking process is set as T3.

[0089] Taking the first stage as an example, the following table is the operation stage table of the reaction device:

[0090]

[0091] In this scheme, the value of T1 is 90 min, the value of T2 is 90 min, the value of T3 is 90 min, and the value of T is 270 min.

[0092] Example Two:

[0093] The combined reaction device further includes a PLC control system, which is electrically connected to the air-lift internal circulation reactor 10, the water inlet system 20, the aeration system 30, and the water outlet system 40 for controlling. The durations of each operation period are adjustable in the automatic mode, and each reactor can be shut down for maintenance separately in the manual mode.

[0094] Example 3:

[0095] See Figures 3-6 , an operation method of a combined reaction device for culturing aerobic granular sludge, which is used for in-situ culturing of aerobic granular sludge, and specifically includes the following steps:

[0096] S1. Sewage enters the reactor from the water inlet 11 at the bottom of the first air-lift internal circulation reactor R1 through the water inlet system 20. At this time, the aeration system 30 of the first air-lift internal circulation reactor R1 is turned on, the sludge discharge port 13 is closed, and the water outlet system 40 is turned on.

[0097] The sewage is evenly distributed to the second air-lift internal circulation reactor R2 and the fourth air-lift internal circulation reactor R4. At this time, the aeration systems 30 of the second air-lift internal circulation reactor R2 and the fourth air-lift internal circulation reactor R4 are turned on, the sludge discharge port 13 is closed, and the water outlet system 40 is turned on.

[0098] The sewage enters the third air-lift internal circulation reactor R3 from the water outlet systems 40 of the second air-lift internal circulation reactor R2 and the fourth air-lift internal circulation reactor R4. At this time, the aeration system 30 of the third air-lift internal circulation reactor R3 is turned off, the sludge discharge port 13 is opened, and the water outlet system 40 is turned on.

[0099] In this process, the first air-lift internal circulation reactor R1 is the water inlet process, the second air-lift internal circulation reactor R2 and the fourth air-lift internal circulation reactor R4 are the aerobic blanketing aeration processes, and the third air-lift internal circulation reactor R3 is the sedimentation and water outlet process.

[0100] S2. Sewage enters the reactor from the water inlet 11 at the bottom of the second air-lift internal circulation reactor R2 through the water inlet system 20. At this time, the aeration system 30 of the second air-lift internal circulation reactor R2 is turned on, the sludge discharge port 13 is closed, the sludge discharge port 13 is closed, and the water outlet system 40 is turned on.

[0101] The sewage is evenly distributed to the first air-lift internal circulation reactor R1 and the third air-lift internal circulation reactor R3. At this time, the aeration systems 30 of the first air-lift internal circulation reactor R1 and the third air-lift internal circulation reactor R3 are turned on, the sludge discharge port 13 is closed, and the water outlet system 40 is turned on.

[0102] Sewage enters the fourth air-lift internal circulation reactor R4 from the effluent systems 40 of the first air-lift internal circulation reactor R1 and the third air-lift internal circulation reactor R3. At this time, the aeration system 30 of the fourth air-lift internal circulation reactor R4 is closed, the sludge discharge port 13 is opened, and the effluent system 40 is opened.

[0103] In this process, the second air-lift internal circulation reactor R2 is for the water inlet process, the first air-lift internal circulation reactor R1 and the third air-lift internal circulation reactor R3 are for the aerobic blanking process, and the fourth air-lift internal circulation reactor R4 is for the sedimentation effluent process.

[0104] S3. Sewage enters the reactor through the water inlet pipe 3 at the bottom of the third air-lift internal circulation reactor R3 via the water inlet system 20. At this time, the aeration system 30 of the third air-lift internal circulation reactor R3 is opened, the sludge discharge port 13 is closed, and the effluent system 40 is opened;

[0105] The sewage is evenly distributed to the second air-lift internal circulation reactor R2 and the fourth air-lift internal circulation reactor R4. At this time, the aeration systems 30 of the second air-lift internal circulation reactor R2 and the fourth air-lift internal circulation reactor R4 are opened, the sludge discharge port 13 is closed, and the effluent system 40 is opened;

[0106] Sewage enters the first air-lift internal circulation reactor R1 from the effluent systems 40 of the second air-lift internal circulation reactor R2 and the fourth air-lift internal circulation reactor R4. At this time, the aeration system 30 of the first air-lift internal circulation reactor R1 is closed, the sludge discharge port 13 is opened, and the effluent system 40 is opened.

[0107] In this process, the third air-lift internal circulation reactor R3 is for the water inlet process, the second air-lift internal circulation reactor R2 and the fourth air-lift internal circulation reactor R4 are for the aerobic blanking process, and the first air-lift internal circulation reactor R1 is for the sedimentation effluent process.

[0108] S4. Sewage enters the reactor through the water inlet pipe 3 at the bottom of the fourth air-lift internal circulation reactor R4 via the water inlet system 20. At this time, the aeration system 30 of the fourth air-lift internal circulation reactor R4 is opened, the sludge discharge port 13 is closed, and the effluent system 40 is opened;

[0109] The sewage is evenly distributed to the first air-lift internal circulation reactor R1 and the third air-lift internal circulation reactor R3. At this time, the aeration systems 30 of the first air-lift internal circulation reactor R1 and the third air-lift internal circulation reactor R3 are opened, the sludge discharge port 13 is closed, and the effluent system 40 is opened;

[0110] Sewage enters the second air-lift internal circulation reactor R2 from the effluent systems 40 of the first air-lift internal circulation reactor R1 and the third air-lift internal circulation reactor R3. At this time, the aeration system 30 of the second air-lift internal circulation reactor R2 is closed, the sludge discharge port 13 is opened, and the effluent system 40 is opened.

[0111] In this process, the fourth air-lift internal circulation reactor R4 is for the water inlet process, the first air-lift internal circulation reactor R1 and the third air-lift internal circulation reactor R3 are for the aerobic blanketing aeration process, and the second air-lift internal circulation reactor R2 is for the sedimentation and effluent process.

[0112] This embodiment is provided in a reaction device with a treatment scale of 3.56 L / h, and the operation treatment effects are shown in the following table:

[0113]

[0114] In actual implementation, it can be found that the present invention can remove some pollutants in the sewage. The removal rate of COD is 85.60%, the removal rate of NH3-N is 87.42%, the removal rate of TN is 79.46%, and the removal rate of TP is 67.91%.

[0115] In Figures 3-6 , the connection relationships of the four air-lift internal circulation reactors in each operation stage are respectively shown. In actual application, an integrated pipeline structure can be formed through the combination of tee pipe fittings and valves, and by switching each valve, the operation of each stage can be realized.

Claims

1. A method for operating a combined reaction device for culturing aerobic granular sludge, characterized in that: A combined reaction device for culturing aerobic granular sludge is adopted. The combined reaction device for culturing aerobic granular sludge includes a reactor main body. The reactor main body includes four air-lift internal circulation reactors (10). An inlet (11), an aeration head (12), a sludge discharge port (13), and an outlet (14) are respectively arranged on the air-lift internal circulation reactor (10). The aeration head (12) of the air-lift internal circulation reactor (10) is communicated with an aeration system (30). The cross-sectional area of the upflow zone provided in the air-lift internal circulation reactor (10) is the same as that of the downflow zone. The four air-lift internal circulation reactors (10) include a first air-lift internal circulation reactor (R1), a second air-lift internal circulation reactor (R2), a third air-lift internal circulation reactor (R3), and a fourth air-lift internal circulation reactor (R4). The reactor main body includes four operation stages. Each operation stage includes three processes: water inlet, aerobic blanketing aeration, and sedimentation and water discharge. The four air-lift internal circulation reactors (10) operate symmetrically and alternately in each operation stage to in-situ culture activated sludge into aerobic granular sludge. During the circulation process, sewage continuously enters the air-lift internal circulation reactor (10). Each air-lift internal circulation reactor (10) is periodically under aerobic or anaerobic conditions, forming a nutritional condition with an alternation of feast and famine periods in terms of time and space. During the water inlet process and / or the aerobic blanketing aeration process, the aeration system (30) of the air-lift internal circulation reactor (10) remains open to provide the circulating power, hydraulic shear force, and dissolved oxygen of the granular sludge. During the sedimentation and water discharge process, the aeration system (30) of the air-lift internal circulation reactor (10) remains closed. The operation method is used for in-situ culturing aerobic granular sludge and specifically includes the following steps: S1. Sewage enters the reactor through the inlet (11) at the bottom of the first air-lift internal circulation reactor (R1) via the water inlet system (20). At this time, the aeration system (30) of the first air-lift internal circulation reactor (R1) is open, the sludge discharge port (13) is closed, and the water outlet system (40) is open. The sewage is evenly distributed to the second air-lift internal circulation reactor (R2) and the fourth air-lift internal circulation reactor (R4). At this time, the aeration systems (30) of the second air-lift internal circulation reactor (R2) and the fourth air-lift internal circulation reactor (R4) are open, the sludge discharge ports (13) are closed, and the water outlet systems (40) are open. The sewage enters the third air-lift internal circulation reactor (R3) from the water outlet systems (40) of the second air-lift internal circulation reactor (R2) and the fourth air-lift internal circulation reactor (R4). At this time, the aeration system (30) of the third air-lift internal circulation reactor (R3) is closed, the sludge discharge port (13) is open, and the water outlet system (40) is open. S2. Sewage enters the reactor through the inlet (11) at the bottom of the second air-lift internal circulation reactor (R2) via the water inlet system (20). At this time, the aeration system (30) of the second air-lift internal circulation reactor (R2) is open, the sludge discharge port (13) is closed, and the water outlet system (40) is open. The sewage is evenly distributed to the first air-lift internal circulation reactor (R1) and the third air-lift internal circulation reactor (R3). At this time, the aeration system (30) of the first air-lift internal circulation reactor (R1) and the third air-lift internal circulation reactor (R3) is turned on, the sludge discharge port (13) is closed, and the effluent system (40) is turned on; The sewage enters the fourth air-lift internal circulation reactor (R4) from the effluent systems (40) of the first air-lift internal circulation reactor (R1) and the third air-lift internal circulation reactor (R3). At this time, the aeration system (30) of the fourth air-lift internal circulation reactor (R4) is turned off, the sludge discharge port (13) is turned on, and the effluent system (40) is turned on; S3. The sewage enters the reactor through the water inlet pipe (3) at the bottom of the third air-lift internal circulation reactor (R3) via the water inlet system (20). At this time, the aeration system (30) of the third air-lift internal circulation reactor (R3) is turned on, the sludge discharge port (13) is closed, and the effluent system (40) is turned on; The sewage is evenly distributed to the second air-lift internal circulation reactor (R2) and the fourth air-lift internal circulation reactor (R4). At this time, the aeration systems (30) of the second air-lift internal circulation reactor (R2) and the fourth air-lift internal circulation reactor (R4) are turned on, the sludge discharge port (13) is closed, and the effluent system (40) is turned on; The sewage enters the first air-lift internal circulation reactor (R1) from the effluent systems (40) of the second air-lift internal circulation reactor (R2) and the fourth air-lift internal circulation reactor (R4). At this time, the aeration system (30) of the first air-lift internal circulation reactor (R1) is turned off, the sludge discharge port (13) is turned on, and the effluent system (40) is turned on; S4. The sewage enters the reactor through the water inlet pipe (3) at the bottom of the fourth air-lift internal circulation reactor (R4) via the water inlet system (20). At this time, the aeration system (30) of the fourth air-lift internal circulation reactor (R4) is turned on, the sludge discharge port (13) is closed, and the effluent system (40) is turned on; The sewage is evenly distributed to the first air-lift internal circulation reactor (R1) and the third air-lift internal circulation reactor (R3). At this time, the aeration systems (30) of the first air-lift internal circulation reactor (R1) and the third air-lift internal circulation reactor (R3) are turned on, the sludge discharge port (13) is closed, and the effluent system (40) is turned on; The sewage enters the second air-lift internal circulation reactor (R2) from the effluent systems (40) of the first air-lift internal circulation reactor (R1) and the third air-lift internal circulation reactor (R3). At this time, the aeration system (30) of the second air-lift internal circulation reactor (R2) is turned off, the sludge discharge port (13) is turned on, and the effluent system (40) is turned on.

2. The operation method of the combined reaction device for culturing aerobic granular sludge according to claim 1, characterized in that: It also includes a PLC control system, which is electrically connected to the air-lift internal circulation reactor (10), the water inlet system (20), the aeration system (30), and the effluent system (40) for control.

3. The operating method of the combined reaction device for culturing aerobic granular sludge according to claim 1, characterized in that, The total operating cycle of the three processes of water inlet, aerobic blanketing aeration, and sedimentation effluent is T, and the operating duration of each process is adjustable; among them, the duration of the water inlet process is set as T1, the duration of the aerobic blanketing aeration process is set as T2, and the duration of the aerobic blanketing aeration process is set as T3.

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