Reaction device for promoting generation of compact activated sludge

Abstract

The utility model provides a reaction device for promoting generation of compact activated sludge, which relates to the technical field of sewage treatment and comprises a main flow SBR (sequencing batch reactor) reaction structure, a side flow SBR reaction structure, a water inlet bucket, a water outlet bucket and an aeration structure. The side flow SBR reaction structure is connected with the main flow SBR reaction structure through a water conveying assembly; the main flow SBR reaction structure is used for taking out sewage from the water inlet barrel and conveying part of the taken-out sewage to the side flow SBR reaction structure; and the side flow SBR reaction structure is used for stirring the sewage through the second stirring mechanism so as to enable the sewage to be in an anoxic state, and discharging the sewage in the anoxic state to the main flow SBR reaction structure after the reaction of the main flow SBR reaction structure is finished. According to the utility model, the technical problems in the prior art that the forming speed of compact activated sludge is relatively slow and the settling performance of the compact activated sludge in the generation process is relatively poor are solved.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater treatment, and in particular to a reaction device for promoting the formation of dense activated sludge. Background Technology

[0002] Excessive nutrients (such as nitrogen and phosphorus) entering water bodies can cause eutrophication, which is harmful to human health. Therefore, wastewater treatment plants are an important line of defense against these threats, and biological denitrification technology is widely used in wastewater treatment plants.

[0003] Over the past decade, simultaneous nitrification and denitrification (SND) has been considered a highly promising biological nitrogen removal process. Compared to traditional biological nitrogen removal processes, SND occurs within the same system, allowing the denitrification reaction to directly utilize nitrification products, reducing nitrate accumulation and increasing the overall nitrogen removal rate. However, SND often occurs under hypoxic conditions, which can easily lead to deterioration of filamentous bulking sedimentation performance. Filamentous bacteria can survive and adapt to hypoxic environments, and even when kept in an anaerobic state for a considerable period, they do not lose their vitality; once an aerobic environment is restored, they will regrow and reproduce.

[0004] Aerobic granular sludge is often mentioned together with simultaneous nitrification and denitrification processes. Because granular sludge (with a particle size greater than 200 μm) has a layered structure, dissolved oxygen forms a gradient through oxygen mass transfer within it; the outer layer of the granules is in an aerobic state, while the inner layer is in an anaerobic / anoxic state; and aerobic granular sludge can accommodate a variety of microorganisms with different functions, which is conducive to the occurrence of simultaneous nitrification and denitrification. Furthermore, aerobic granular sludge has good settling properties, which is beneficial for the growth of slow-growing autotrophic bacteria. Therefore, it is reasonable to believe that the formation of aerobic granular sludge is more advantageous for the application of simultaneous nitrification and denitrification. However, when starting simultaneous nitrification and denitrification with ordinary flocculent sludge, the formation of aerobic granular sludge is quite difficult.

[0005] Correspondingly, dense activated sludge (with a particle size between 100 μm and 200 μm) also exhibits good settling and simultaneous nitrification-denitrification denitrification performance. It is considered an immature aerobic granular sludge, and its spontaneous formation is less difficult than that of aerobic granular sludge, allowing for cultivation. Therefore, it holds greater potential for practical application in deep wastewater denitrification. However, dense activated sludge suffers from slow formation rates and poor settling properties during its formation. Utility Model Content

[0006] The purpose of this invention is to provide a reaction device that promotes the formation of dense activated sludge, thereby alleviating the technical problems of slow formation rate of dense activated sludge and poor settling performance of dense activated sludge during the formation process in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] In a first aspect, this utility model provides a reaction device for promoting the formation of dense activated sludge, including a mainstream SBR reaction structure, a side-flow SBR reaction structure, an inlet tank, an outlet tank, and an aeration structure, wherein the side-flow SBR reaction structure, the inlet tank, the outlet tank, and the aeration structure are all connected to the mainstream SBR reaction structure.

[0009] The side-flow SBR reaction structure includes a water supply component and a second stirring mechanism. The side-flow SBR reaction structure is connected to the main flow SBR reaction structure through the water supply component.

[0010] The main SBR reaction structure is used to remove wastewater from the inlet tank and transport a portion of the removed wastewater to the side-flow SBR reaction structure.

[0011] The side-flow SBR reaction structure is used to agitate the wastewater through a second stirring mechanism to make the wastewater anoxic, and to discharge the anoxic wastewater into the mainstream SBR reaction structure after the reaction is completed.

[0012] Furthermore, the side-flow SBR reaction structure also includes a side-flow SBR reaction mechanism, which includes a side-flow SBR reactor and the water delivery assembly;

[0013] The side-flow SBR reactor is connected to the main-flow SBR reactor structure via the water delivery assembly, and the side-flow SBR reactor is connected to the second stirring mechanism.

[0014] Furthermore, the water supply assembly includes a water supply pipe and a water supply electric valve. One end of the water supply pipe is connected to the side-flow SBR reactor, and the other end is connected to the main-flow SBR reaction structure.

[0015] The electric water supply valve is connected to the water supply pipe.

[0016] Furthermore, the second stirring mechanism includes a second stirrer and a second stirring blade. The second stirrer is connected to the side-flow SBR reactor, and the output end of the second stirrer is connected to the second stirring blade via a rotating shaft.

[0017] The second stirring blade is located inside the side-flow SBR reactor.

[0018] Furthermore, the mainstream SBR reaction structure includes a mainstream SBR reaction mechanism and a first stirring mechanism, wherein the mainstream SBR reaction mechanism is connected to the side-flow SBR reaction structure, the inlet tank, the outlet tank and the aeration structure respectively;

[0019] The first stirring mechanism is connected to the mainstream SBR reaction mechanism, and the first stirring mechanism is used to stir the wastewater in the mainstream SBR reaction mechanism.

[0020] Furthermore, the mainstream SBR reaction mechanism includes a mainstream SBR reactor, an inlet water assembly, and a drain water assembly. The mainstream SBR reactor is connected to the inlet water tank through the inlet water assembly, and the mainstream SBR reactor is connected to the outlet water tank through the drain water assembly.

[0021] The mainstream SBR reactor is connected to both the sidestream SBR reactor structure and the aeration structure.

[0022] Furthermore, the water inlet assembly includes an inlet pipe and an inlet pump, with one end of the inlet pipe connected to the main SBR reactor and the other end connected to the inlet tank;

[0023] The water inlet pump is connected to the water inlet pipe.

[0024] Furthermore, the drainage assembly includes a drain pipe and a drain electric valve, one end of the drain pipe being connected to the main SBR reactor and the other end being connected to the effluent tank;

[0025] The electric drain valve is connected to the drain pipe.

[0026] Furthermore, the aeration structure includes an aeration disc and an aeration pump. The aeration disc is connected to the aeration pump via a pipeline, and the aeration disc is located at the bottom inside the main SBR reactor.

[0027] Furthermore, the reaction device for promoting the formation of dense activated sludge also includes a detection structure, which includes a detector and a detection probe, with the detector connected to the detection probe;

[0028] The detection probe is located inside the mainstream SBR reactor.

[0029] This utility model can achieve the following beneficial effects:

[0030] In a first aspect, this utility model provides a reaction device for promoting the formation of dense activated sludge, including a mainstream SBR reaction structure, a side-flow SBR reaction structure, an inlet tank, an outlet tank, and an aeration structure. The side-flow SBR reaction structure, the inlet tank, the outlet tank, and the aeration structure are all connected to the mainstream SBR reaction structure. The side-flow SBR reaction structure includes a water conveying component and a second stirring mechanism, and the side-flow SBR reaction structure is connected to the mainstream SBR reaction structure through the water conveying component. The mainstream SBR reaction structure is used to remove wastewater from the inlet tank and transport a portion of the removed wastewater to the side-flow SBR reaction structure. The side-flow SBR reaction structure is used to stir the wastewater through the second stirring mechanism to make the wastewater in an anoxic state, and after the reaction in the mainstream SBR reaction structure is completed, the anoxic wastewater is discharged to the mainstream SBR reaction structure.

[0031] In this invention, at least one side-flow SBR reaction structure is set on one side of the main SBR reaction structure. During use, wastewater is transported from the inlet tank to the main SBR reaction structure, while the main SBR reaction structure transports a small portion of the wastewater to the side-flow SBR reaction structure. During the wastewater treatment process of the main SBR reaction structure, the passage between the side-flow SBR reaction structure and the main SBR reaction structure is closed to prevent wastewater from flowing back into the main SBR reaction structure. The wastewater in the main SBR reaction structure is aerated by the aeration structure, then allowed to settle and achieve water and sludge separation. During the settling stage, the main SBR reaction structure is in a state of minimal disturbance, and the activated sludge gradually forms a denser floc or granular structure through self-aggregation, thereby promoting the compactness of the activated sludge. At this point, the wastewater mixture within the side-flow SBR reaction structure is further processed by anoxic or anaerobic microorganisms (such as methanogenic bacteria and denitrifying bacteria) through the metabolism of residual organic matter, thereby consuming pollutants and promoting the diversity of the microenvironment. This enhances the overall system's resistance to disturbance and long-term stability. The wastewater from the side-flow SBR reaction structure is then discharged into the main-flow SBR reaction structure for further processing.

[0032] Compared with existing technologies, the present invention provides a reaction device for promoting the formation of dense activated sludge. By connecting the mainstream SBR reaction structure and the side-flow SBR reaction structure, wastewater is injected into the mainstream SBR reaction structure during use, and a portion of the wastewater is then injected into the side-flow SBR reaction structure. Since the mainstream SBR reaction structure is in a state of minimal disturbance during the static stage, the activated sludge gradually forms a denser floc or granular structure through self-aggregation, thereby promoting the density of the activated sludge, resulting in better settling effect and faster sludge formation rate. Furthermore, in the wastewater mixture within the side-flow SBR reaction structure, anoxic or anaerobic microorganisms further consume pollutants and promote the diversity of the microenvironment by metabolizing residual organic matter.

[0033] Furthermore, when the reactor enters the alternating reaction phase (anaerobic / aerobic), i.e., alternating feast / famine, it is also conducive to sludge granulation. After introducing this side-flow SBR reactor, this part of the sludge does not participate in the reaction in the mainstream SBR reactor, which is equivalent to the famine time being extended. This feast / famine condition is believed to increase the generation of extracellular polymers and promote the formation of dense sludge.

[0034] In summary, this invention at least alleviates the technical problems of slow formation rate of dense activated sludge and poor settling performance of dense activated sludge during the formation process in the prior art. Attached Figure Description

[0035] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 A schematic diagram of the overall structure of the reaction device for promoting the formation of dense activated sludge provided in an embodiment of this utility model;

[0037] Figure 2 A schematic diagram of the mainstream SBR reaction structure of the reaction device for promoting the formation of dense activated sludge provided in the embodiments of this utility model;

[0038] Figure 3 A schematic diagram of the side-flow SBR reaction structure of the reaction device for promoting the formation of dense activated sludge provided in an embodiment of this utility model;

[0039] Figure 4 A schematic diagram of the DO online detection structure of the reaction device for promoting the formation of dense activated sludge provided in an embodiment of this utility model;

[0040] Figure 5 A schematic diagram of the aeration structure of the reaction device for promoting the formation of dense activated sludge provided in an embodiment of this utility model.

[0041] Icons: 1-Mainstream SBR reaction structure; 11-Mainstream SBR reaction mechanism; 111-Mainstream SBR reactor; 112-Inlet water assembly; 1121-Inlet water pipe; 1122-Inlet water pump; 113-Drainage assembly; 1131-Drainage pipe; 1132-Drainage electric valve; 114-First sampling port; 12-First stirring mechanism; 121-First stirrer; 122-First stirring blade; 2-Side-flow SBR reaction structure; 21-Side-flow SBR reaction mechanism; 211-Side-flow SBR reactor; 212-Water supply assembly; 2121-Water supply pipe; 2122-Water supply electric valve; 213-Second sampling port; 22-Second stirring mechanism; 221-Second stirrer; 222-Second stirring blade; 3-Detection structure; 31-Detector; 32-Detection probe; 4-Inlet tank; 5-Outlet tank; 6-Aeration structure; 61-Aeration disc; 62-Aeration pump. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0044] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0045] In the description of this utility model, it should be noted that the terms "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0047] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0048] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0049] Example 1

[0050] This embodiment provides a reaction device for promoting the formation of dense activated sludge, as described above. Figure 1 The reaction device for promoting the formation of dense activated sludge includes a main flow SBR reaction structure 1, a side flow SBR reaction structure 2, an inlet tank 4, an outlet tank 5, and an aeration structure 6. The side flow SBR reaction structure 2, the inlet tank 4, the outlet tank 5, and the aeration structure 6 are all connected to the main flow SBR reaction structure 1. The side flow SBR reaction structure 2 includes a water conveying component 212 and a second stirring mechanism 22. The side flow SBR reaction structure 2 is connected to the main flow SBR reaction structure 1 through the water conveying component 212. The main flow SBR reaction structure 1 is used to remove wastewater from the inlet tank 4 and transport part of the removed wastewater to the side flow SBR reaction structure 2. The side flow SBR reaction structure 2 is used to stir the wastewater through the second stirring mechanism 22 to make the wastewater in an anoxic state, and after the reaction in the main flow SBR reaction structure 1 is completed, the anoxic wastewater is discharged to the main flow SBR reaction structure 1.

[0051] This invention at least alleviates the technical problems of slow formation rate of dense activated sludge and poor settling performance of dense activated sludge during the formation process in the prior art.

[0052] In this embodiment of the invention, at least one side-flow SBR reaction structure 2 is provided on one side of the main SBR reaction structure 1. During use, wastewater is transported from the inlet tank 4 to the main SBR reaction structure 1, while the main SBR reaction structure 1 transports a small portion of the wastewater to the side-flow SBR reaction structure 2. During the wastewater treatment process of the main SBR reaction structure 1, the passage between the side-flow SBR reaction structure 2 and the main SBR reaction structure 1 is closed to prevent wastewater from flowing back into the main SBR reaction structure 1. After the wastewater in the main SBR reaction structure 1 is aerated by the aeration structure 6, it is allowed to settle and achieve separation of water and sludge. During the settling stage, the main SBR reaction structure 1 is in a state of minimal disturbance, and the activated sludge gradually forms a denser floc or granular structure through self-aggregation, thereby promoting the compactness of the activated sludge. At this point, the wastewater mixture in the side-flow SBR reaction structure 2 is further consumed by anoxic or anaerobic microorganisms (such as methanogenic bacteria, denitrifying bacteria, etc.) through the metabolism of residual organic matter, thereby promoting the diversity of the microenvironment and improving the overall system's resistance to disturbance and long-term stability. Then, the wastewater in the side-flow SBR reaction structure 2 is discharged into the main SBR reaction structure 1 for further processing.

[0053] Compared with the prior art, the present invention provides a reaction device for promoting the formation of dense activated sludge. By connecting the mainstream SBR reaction structure 1 and the side-flow SBR reaction structure 2, wastewater is injected into the mainstream SBR reaction structure 1 during use, and a portion of the wastewater is then injected into the side-flow SBR reaction structure 2. Since the mainstream SBR reaction structure 1 is in a state of less disturbance during the static stage, the activated sludge gradually forms a denser floc or granular structure through self-aggregation, thereby promoting the density of the activated sludge, resulting in better settling effect and faster sludge formation rate. Furthermore, in the wastewater mixture within the side-flow SBR reaction structure 2, anoxic or anaerobic microorganisms further consume pollutants and promote the diversity of the microenvironment by metabolizing residual organic matter.

[0054] In an optional implementation of this embodiment, refer to Figure 3 The side-flow SBR reaction structure 2 also includes a side-flow SBR reaction mechanism 21, which includes a side-flow SBR reactor 211 and a water conveying assembly 212. The side-flow SBR reactor 211 is connected to the main flow SBR reaction structure 1 through the water conveying assembly 212, and the side-flow SBR reactor 211 is connected to the second stirring mechanism 22.

[0055] Specifically: the side-flow SBR reactor 211 is preferably a tank-shaped vessel, and it is connected to the main SBR reaction structure 1 through a water conveyance assembly 212; preferably, the horizontal height of the side-flow SBR reactor 211 is higher than that of the main SBR reaction structure 1, so that the wastewater can be returned to the main SBR reaction structure 1 by gravity.

[0056] It should be noted that the sidewall of the sideflow SBR reactor 211 is provided with a second sampling port 213, through which the user can take out wastewater samples from the sideflow SBR reactor 211.

[0057] Furthermore, referring to Figure 3 The water supply assembly 212 includes a water supply pipe 2121 and a water supply electric valve 2122. One end of the water supply pipe 2121 is connected to the side-flow SBR reactor 211, and the other end is connected to the main flow SBR reaction structure 1. The water supply electric valve 2122 is connected to the water supply pipe 2121.

[0058] Specifically: the two ends of the water supply pipe 2121 are connected to the side-flow SBR reactor 211 and the main flow SBR reaction structure 1, respectively, and a water supply electric valve 2122 is installed on the water supply pipe 2121; in use, the water supply electric valve 2122 can draw sewage from the main flow SBR reaction structure 1 into the side-flow SBR reactor 211, while the water supply electric valve 2122 is in a closed state during the processing of the main flow SBR reaction structure 1.

[0059] In an optional implementation of this embodiment, refer to Figure 3 The second stirring mechanism 22 includes a second stirrer 221 and a second stirring blade 222. The second stirrer 221 is connected to the side-flow SBR reactor 211, and the output end of the second stirrer 221 is connected to the second stirring blade 222 through a rotating shaft. The second stirring blade 222 is disposed inside the side-flow SBR reactor 211.

[0060] Specifically: the second agitator 221 is connected to the top of the side-flow SBR reactor 211, and the bottom output end of the second agitator 221 is provided with a rotating shaft in the vertical direction, and the other end of the rotating shaft is connected to a plurality of second stirring blades 222, which are located at a corresponding depth in the side-flow SBR reactor 211; in use, the second agitator 221 drives the second stirring blades 222 to rotate, so as to stir the sewage in the side-flow SBR reactor 211.

[0061] In an optional implementation of this embodiment, refer to Figure 2The main SBR reaction structure 1 includes a main SBR reaction mechanism 11 and a first stirring mechanism 12. The main SBR reaction mechanism 11 is connected to the side-flow SBR reaction structure 2, the inlet tank 4, the outlet tank 5 and the aeration structure 6 respectively. The first stirring mechanism 12 is connected to the main SBR reaction mechanism 11 and is used to stir the sewage in the main SBR reaction mechanism 11.

[0062] Specifically: the main SBR reaction unit 11 is connected to the first stirring unit 12, and the first stirring unit 12 is used to stir the wastewater in the main SBR reaction unit 11; the main SBR reaction unit 11 is connected to the inlet tank 4, the outlet tank 5, and the aeration structure 6 respectively. This allows wastewater to be discharged from the inlet tank 4 into the main SBR reaction unit 11, and after treatment, the precipitated water is discharged into the outlet tank 5. The aeration structure 6 is used to process the wastewater in the main SBR reaction unit 11 to achieve water and sludge separation.

[0063] It should be noted that the first stirring mechanism 12 includes a first stirrer 121 and a first stirring blade 122. The first stirrer 121 is connected to the main SBR reactor 111, and the output end of the first stirrer 121 is provided with a rotating shaft in the vertical direction. The bottom of the rotating shaft is provided with a plurality of first stirring blades 122, and the first stirring blades 122 are located inside the main SBR reactor 111.

[0064] Furthermore, a first sampling port 114 is provided on the side wall of the main SBR reactor 111 to facilitate the extraction of wastewater samples from the main SBR reactor 111 through the first sampling port 114.

[0065] Furthermore, referring to Figure 2 The main SBR reaction mechanism 11 includes a main SBR reactor 111, an inlet component 112, and a drain component 113. The main SBR reactor 111 is connected to the inlet tank 4 through the inlet component 112, and the main SBR reactor 111 is connected to the outlet tank 5 through the drain component 113. The main SBR reactor 111 is connected to the side-flow SBR reaction structure 2 and the aeration structure 6 respectively.

[0066] Specifically: the main SBR reactor 111 is connected to the inlet tank 4 through the inlet component 112 so that the sewage in the inlet tank 4 can be discharged into the main SBR reactor 111; and the main SBR reactor 111 is connected to the outlet tank 5 through the drain component 113 so that after the water and sludge are separated, the water is discharged from the drain component 113 into the outlet tank 5.

[0067] Furthermore, referring to Figure 2The water inlet assembly 112 includes a water inlet pipe 1121 and a water inlet pump 1122. One end of the water inlet pipe 1121 is connected to the main SBR reactor 111, and the other end is connected to the water inlet tank 4. The water inlet pump 1122 is connected to the water inlet pipe 1121.

[0068] Specifically: One end of the inlet pipe 1121 is connected to the main SBR reactor 111, and the other end is connected to the inlet tank 4. The sewage in the inlet tank 4 is pumped into the main SBR reactor 111 by the inlet pump 1122.

[0069] In an optional implementation of this embodiment, refer to Figure 2 The drainage assembly 113 includes a drain pipe 1131 and a drain electric valve 1132. One end of the drain pipe 1131 is connected to the main SBR reactor 111, and the other end is connected to the outlet tank 5. The drain electric valve 1132 is connected to the drain pipe 1131.

[0070] Specifically: one end of the drain pipe 1131 is connected to the main SBR reactor 111, and the other end is connected to the outlet tank 5; during use, the drain pipe 1131 is opened or closed by the drain electric valve 1132 so that the separated water is discharged from the drain pipe 1131.

[0071] In an optional implementation of this embodiment, refer to Figure 5 The aeration structure 6 includes an aeration disc 61 and an aeration pump 62. The aeration disc 61 is connected to the aeration pump 62 through a pipeline, and the aeration disc 61 is located at the bottom inside the main SBR reactor 111.

[0072] Specifically: The aeration disc 61 is located at the bottom inside the main SBR reactor 111, and it is connected to the aeration pump 62 located outside the main SBR reactor 111 through a pipeline. When in use, the aeration pump 62 sends air through the aeration disc 61 into the main SBR reactor 111 to accelerate the separation of water and sludge.

[0073] In an optional implementation of this embodiment, refer to Figure 4 The reaction device that promotes the formation of dense activated sludge also includes a detection structure 3, which includes a detector 31 and a detection probe 32. The detector 31 is connected to the detection probe 32. The detection probe 32 is located inside the main SBR reactor 111.

[0074] Specifically: the detection structure 3 includes a detector 31 and a detection probe 32. The detector 31 can be an online DO detector, and the detector 31 is electrically connected to the detection probe 32. The detection probe 32 is set inside the main SBR reactor 111. The detector 31 is used to detect the concentration of dissolved oxygen in the wastewater.

[0075] During use:

[0076] First, start the reaction device. Specifically, take activated sludge from the laboratory that has simultaneous nitrification, denitrification and phosphorus removal capabilities, perform gravity settling, remove the supernatant, add water to wash the sludge repeatedly to remove impurities such as sand and gravel, and then put it into the mainstream SBR reactor 111. The initial sludge concentration is set to 3800 mg / L.

[0077] Second, the mainstream SBR reactor 111 and the side-flow SBR reactor 211 enter a cyclical operation mode of alternating shutdown, including:

[0078] Start the inlet pump 1122 to pump urban domestic sewage from the inlet tank 4 into the main SBR reactor 111 at the beginning of each cycle.

[0079] Start the first stirring mechanism 12, and at the same time open the electric water supply valve 2122 connecting the main flow SBR reactor 111 and the side flow SBR reactor 211. The water inlet time is 5 minutes.

[0080] When the water supply electric valve 2122 is closed, the second stirring mechanism 22 of the side-flow SBR reactor 211 is turned on. The side-flow SBR reactor 211 does not participate in the reaction of the main SBR reactor 111 and is always in an oxygen-deficient stirring state.

[0081] After the mainstream SBR reactor 111 receives influent, it enters the anaerobic reaction stage, which lasts for 2 hours.

[0082] Immediately afterwards, the main SBR reactor 111 enters the aerobic reaction stage. With the first stirring mechanism 12 turned on, the aeration pump 62 is started to fill the aeration plate 61 at the bottom of the main SBR reactor 111 with oxygen. The dissolved oxygen concentration is controlled at 0.6-0.8 mg / L for 3 hours.

[0083] After the aerobic reaction in the mainstream SBR reactor 111 is completed, the sludge settling period begins. The first stirring mechanism 12 and the aeration structure 6 of the mainstream SBR reactor 111 are shut down for 20 minutes.

[0084] Then, the mainstream SBR reactor 111 enters the drainage stage, and the drainage electric valve 1132 is opened to discharge the supernatant after sedimentation in the mainstream SBR reactor 111 for 5 minutes.

[0085] Close the drain electric valve 1132 to perform sludge exchange, and open the water supply electric valve 2122 connecting the main flow SBR reactor 111 and the side flow SBR reactor 211. The activated sludge in the side flow SBR reactor 211 returns to the main flow SBR reactor 111 by gravity for 10 minutes, with a sludge exchange ratio of 20%.

[0086] Finally, the main SBR reactor 111 enters the idle phase for 20 minutes.

[0087] It should be noted that after introducing the side-flow SBR reactor 211 in this application, the sludge settling properties are significantly improved, and the sludge particle size is significantly increased. The sludge settling volume and sludge volume index at 30 min are 8% and 45.8 mL / g, respectively, and the sludge density is 1.045 g / mL. A cumulative 90% of the particles are less than 80 μm in size. This can improve sludge settling performance and promote sludge densification, thereby achieving the effect of sludge granulation.

[0088] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to mutually. The above embodiments in this specification are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A reaction apparatus for promoting the formation of dense activated sludge, characterized in that, It includes a mainstream SBR reaction structure (1), a side-flow SBR reaction structure (2), an inlet tank (4), an outlet tank (5), and an aeration structure (6). The side-flow SBR reaction structure (2), the inlet tank (4), the outlet tank (5), and the aeration structure (6) are all connected to the mainstream SBR reaction structure (1). The side-flow SBR reaction structure (2) includes a water conveying component (212) and a second stirring mechanism (22). The side-flow SBR reaction structure (2) is connected to the main flow SBR reaction structure (1) through the water conveying component (212). The main SBR reaction structure (1) is used to remove sewage from the inlet tank (4) and transport part of the removed sewage to the side-flow SBR reaction structure (2); The side-flow SBR reaction structure (2) is used to stir the sewage through the second stirring mechanism (22) to make the sewage in an anoxic state, and after the reaction of the main flow SBR reaction structure (1) is completed, the sewage in an anoxic state is discharged to the main flow SBR reaction structure (1).

2. The reaction apparatus for promoting the formation of dense activated sludge according to claim 1, characterized in that, The side-flow SBR reaction structure (2) further includes a side-flow SBR reaction mechanism (21), which includes a side-flow SBR reactor (211) and the water conveyance assembly (212). The side-flow SBR reactor (211) is connected to the main-flow SBR reactor structure (1) via the water delivery assembly (212), and the side-flow SBR reactor (211) is connected to the second stirring mechanism (22).

3. The reaction apparatus for promoting the formation of dense activated sludge according to claim 2, characterized in that, The water supply assembly (212) includes a water supply pipe (2121) and a water supply electric valve (2122). One end of the water supply pipe (2121) is connected to the side-flow SBR reactor (211), and the other end is connected to the main flow SBR reaction structure (1). The electric water supply valve (2122) is connected to the water supply pipe (2121).

4. The reaction apparatus for promoting the formation of dense activated sludge according to claim 2, characterized in that, The second stirring mechanism (22) includes a second stirrer (221) and a second stirring blade (222). The second stirrer (221) is connected to the side-flow SBR reactor (211), and the output end of the second stirrer (221) is connected to the second stirring blade (222) through a rotating shaft. The second stirring blade (222) is located inside the side-flow SBR reactor (211).

5. The reaction apparatus for promoting the formation of dense activated sludge according to claim 1, characterized in that, The mainstream SBR reaction structure (1) includes a mainstream SBR reaction mechanism (11) and a first stirring mechanism (12). The mainstream SBR reaction mechanism (11) is connected to the side-flow SBR reaction structure (2), the inlet tank (4), the outlet tank (5) and the aeration structure (6) respectively. The first stirring mechanism (12) is connected to the mainstream SBR reaction mechanism (11), and the first stirring mechanism (12) is used to stir the sewage in the mainstream SBR reaction mechanism (11).

6. The reaction apparatus for promoting the formation of dense activated sludge according to claim 5, characterized in that, The mainstream SBR reaction mechanism (11) includes a mainstream SBR reactor (111), an inlet water assembly (112), and a drain water assembly (113). The mainstream SBR reactor (111) is connected to the inlet water tank (4) through the inlet water assembly (112), and the mainstream SBR reactor (111) is connected to the outlet water tank (5) through the drain water assembly (113). The main SBR reactor (111) is connected to the side-flow SBR reaction structure (2) and the aeration structure (6), respectively.

7. The reaction apparatus for promoting the formation of dense activated sludge according to claim 6, characterized in that, The water inlet assembly (112) includes an inlet pipe (1121) and an inlet pump (1122). One end of the inlet pipe (1121) is connected to the main SBR reactor (111), and the other end is connected to the inlet tank (4). The water inlet pump (1122) is connected to the water inlet pipe (1121).

8. The reaction apparatus for promoting the formation of dense activated sludge according to claim 6, characterized in that, The drainage assembly (113) includes a drain pipe (1131) and a drain electric valve (1132). One end of the drain pipe (1131) is connected to the main SBR reactor (111), and the other end is connected to the outlet tank (5). The drain electric valve (1132) is connected to the drain pipe (1131).

9. The reaction apparatus for promoting the formation of dense activated sludge according to claim 6, characterized in that, The aeration structure (6) includes an aeration disc (61) and an aeration pump (62). The aeration disc (61) is connected to the aeration pump (62) through a pipeline, and the aeration disc (61) is located at the bottom inside the mainstream SBR reactor (111).

10. The reaction apparatus for promoting the formation of dense activated sludge according to claim 6, characterized in that, It also includes a detection structure (3), which includes a detector (31) and a detection probe (32), wherein the detector (31) is connected to the detection probe (32); The detection probe (32) is located inside the mainstream SBR reactor (111).

Images