CN118724273A - A new type of anaerobic reactor with controllable operating status - Google Patents

Abstract

The present invention relates to the technical field of wastewater treatment equipment, and in particular to a novel anaerobic reactor with controllable operating state, comprising a tank body, a three-phase separator, a reflux channel, a reflow device, a flow rate detection device and a control unit, wherein the three-phase separator is arranged at the upper part of the tank body, the reflux channel comprises a water distribution cylinder and a sludge reflux pipe, the bottom of the water distribution cylinder is sealedly assembled in the tank body, the sludge reflux pipe is circumferentially closed and sealedly connected to the three-phase separator and the water distribution cylinder, the three-phase separator, the sludge reflux pipe and the water distribution cylinder form a closed sludge reflux path to prevent granular sludge from directly entering the reflux channel; the reflow device is located in the sludge reflux pipe to pressurize the sludge and transport it downward; the flow rate detection device detects the flow rate of the mixed liquid in the anaerobic sludge bed; the control unit is connected to the flow rate detection device and the motor, and is used to adjust the speed of the motor according to the detection value of the flow rate detection device, thereby keeping the flow rate of the sludge in the sludge reflux pipe within a set range.

Description

A new type of anaerobic reactor with controllable operating status

Technical Field

The invention relates to the technical field of wastewater treatment equipment, and in particular to a novel anaerobic reactor with controllable operating state.

Background Art

For wastewater with high concentration of organic matter, anaerobic treatment is currently mostly used, using anaerobic microorganisms to decompose organic matter in wastewater and produce biogas to purify wastewater. Due to the characteristics of high organic content and small water volume in wastewater, there are disadvantages such as small water volume making it difficult to evenly distribute water and low flow rate making it impossible to mix mud and water, which affects the efficiency and effect of anaerobic treatment. At present, the main way to solve this problem is to return sludge and mix it with wastewater to dilute the wastewater.

For example, a Chinese patent application with application publication number CN109455814A discloses an anaerobic treatment device suitable for high-concentration and high-suspended solids, including a tank body, a three-phase separator fixed on the upper part of the tank body, a guide tube fixed on the bottom of the tank body, a central return pipe fixed in the three-phase separator, a sludge return hole and a mixed liquid return hole opened on the side of the central return pipe, the sludge return hole is located in the three-phase separator for sludge to enter, the mixed liquid return hole is located below the three-phase separator, and the lower end of the central return pipe penetrates into the guide tube; a submersible return mixer is arranged in the central return pipe. Among them, the tank body is the tank wall in the patent application, and the three-phase separator includes the one-step two-phase separator and the two-step two-phase separator in the patent application.

Since a mixed liquor reflux hole is provided on the side of the central reflux pipe, the granular sludge in the tank body will enter the central reflux pipe through the mixed liquor reflux hole during use and be transported downward, resulting in the loss of granular sludge. In addition, the granular sludge is stirred and broken by the submersible reflux mixer during the transportation process, resulting in a decrease in the treatment efficiency of the granular sludge and a decrease in the sludge activity. Moreover, after being broken, the granular sludge will be lost with the wastewater, resulting in a decrease in the amount of effective sludge in the sludge bed and a further decrease in the treatment effect.

Another example is a Chinese patent with the authorization announcement number CN205241342U, which discloses a circulating anaerobic reactor. As shown in FIG1 , sewage enters from the water inlet pipe and rises in the guide tube 100, contacts the refluxed sludge, and the stirring device 200 mixes the sewage and sludge, and then performs anaerobic reaction treatment. The problem with this patent is that the upper and lower ends of the guide tube 100 are both open, and the granular sludge will directly enter the guide tube 100, the granular sludge will be lost, and the granular sludge will be broken by the stirring blades of the stirring device 200.

That is to say, the anaerobic reactors in the prior art all have the problem that the granular sludge does not pass through the separator but directly enters the return pipe or the guide tube, which will cause the granular sludge to be lost. The granular sludge cannot be quickly cultivated in the early cultivation period, resulting in low granular sludge formation efficiency; and the granular sludge is broken during the operation, which leads to a decrease in the reactor treatment efficiency.

Summary of the invention

The invention provides a novel anaerobic reactor with controllable operating state, so as to solve the technical problems in the prior art that the granular sludge forming efficiency is low and the granular sludge is easy to be broken, resulting in the decrease of the reactor processing efficiency.

In order to solve the above problems, the present invention provides a novel anaerobic reactor with controllable operating state, which adopts the following technical scheme: a novel anaerobic reactor with controllable operating state, comprising:

a tank having an anaerobic sludge blanket composed of granular sludge;

The three-phase separator is located on the upper part of the tank and is used to separate the solid, liquid and gas phases;

Also includes:

The reflux channel includes a water distribution cylinder and a sludge return pipe. The bottom of the water distribution cylinder is sealed and assembled in the tank body. The sludge return pipe is sealed around and sealed at both ends to connect the three-phase separator and the water distribution cylinder. The three-phase separator, the sludge return pipe and the water distribution cylinder form a closed sludge return path to prevent the granular sludge from directly entering the reflux channel. A wastewater inlet pipe extending to the outside of the tank body is installed on one side of the water distribution cylinder, and a mixed liquid spray outlet is provided on the side of the water distribution cylinder.

A returner is located in the sludge return pipe and is used to pressurize the sludge and transport it downward. The returner includes a motor and a paddle connected to the output shaft of the motor;

A flow rate detection device, for detecting the flow rate of the mixed liquid in the anaerobic sludge bed;

The control unit is connected to the flow velocity detection device and the motor, and is used to adjust the speed of the motor according to the detection value of the flow velocity detection device to change the flow rate of the sludge in the sludge return pipe, thereby limiting the flow rate of the mixed liquid in the anaerobic sludge bed within a set range.

Since the sludge return pipe is closed circumferentially and the sludge return pipe is sealed to connect the three-phase separator and the water distribution cylinder, a closed sludge return path is formed, and the granular sludge cannot directly enter the sludge return pipe and the water distribution cylinder, thereby avoiding the loss of granular sludge and preventing the paddle blades from breaking the granular sludge when the return device is working, thereby improving the integrity of the granular sludge and improving the treatment efficiency of the new anaerobic reactor with controllable operating status. Since the three-phase separator, the sludge return pipe and the water distribution cylinder form a closed sludge return path, the return device is a low-speed, high-flow working mode, and the sludge return volume is dynamically adjusted through the flow rate detection device, the control unit and the motor, thereby accurately controlling the flow rate of the mixed liquid, avoiding the wastewater carrying granular sludge into the three-phase separator due to excessive flow rate, and preventing the loss of granular sludge, especially during the cultivation period, by controlling the rising flow rate, the formation of granular sludge can be accelerated, and the granular sludge can also be prevented from being broken by the paddle blades, thereby improving the treatment efficiency; at the same time, it also avoids the overall efficiency of the reactor from decreasing due to too slow flow rate, which cannot meet production needs.

Furthermore, the flow velocity detection device includes a first flow meter and a second flow meter, the detection end of the first flow meter is located below the detection end of the second flow meter, the first flow meter is used to detect the flow velocity of the mixed liquid in the debugging mode, and the second flow meter is used to detect the flow velocity of the mixed liquid in the operating mode.

Furthermore, the anaerobic sludge bed includes a large particle anaerobic sludge bed at the bottom and a small particle anaerobic sludge bed at the top, the detection end of the first flow meter is located in the large particle anaerobic sludge bed, and the detection end of the second flow meter is located in the small particle anaerobic sludge bed.

Furthermore, a motor mounting frame is provided in the sludge return pipe, the motor is fixedly mounted on the motor mounting frame, and the motor mounting frame has a channel for sludge to pass through.

Furthermore, the sludge return pipe comprises an upper return pipe section and a lower return pipe section which are connected in two parts, and the motor mounting bracket is arranged at the bottom of the upper return pipe section. The two parts are connected in two parts, which is convenient for installing the motor mounting bracket and also convenient for individual replacement.

Furthermore, a nozzle is provided on the mixed liquid outlet of the water distribution cylinder, and the nozzle is arranged to be tilted downward to spray the mixed liquid. By providing the nozzle, the spraying speed of the mixed liquid can be accelerated, so that a negative pressure effect can be formed in the anaerobic sludge bed, and the mixing between the mixed liquid and the anaerobic sludge bed can be accelerated.

Furthermore, the nozzles are arranged in at least two layers in an interval manner along the up-down direction, and the nozzles of two adjacent layers are arranged staggered. The staggered arrangement of the nozzles of two adjacent layers can improve the uniformity of water distribution.

Furthermore, the wastewater inlet pipe is arranged at the bottom of the water distribution cylinder and extends along the tangent direction of the water distribution cylinder. When the wastewater enters the water distribution cylinder, a vortex is formed to accelerate the mixing speed of the wastewater and the sludge.

The beneficial effects of the present invention are:

1. Since the sludge return pipe is closed on all sides, and the two ends of the sludge return pipe are sealed and connected to the three-phase separator and the water distribution cylinder, a closed sludge return path is formed, and the granular sludge cannot directly enter the sludge return pipe and the water distribution cylinder, so as to avoid the loss of granular sludge and prevent the paddles from breaking the granular sludge when the return device is working, so as to improve the integrity of the granular sludge and thus improve the treatment efficiency of the new anaerobic reactor with controllable operating status. Since the three-phase separator, the sludge return pipe and the water distribution cylinder form a closed sludge return path, the return device is a low-speed, high-flow working mode, and the sludge return volume is dynamically adjusted through the flow rate detection device, the control unit and the motor, so as to accurately control the flow rate of the mixed liquid, avoid the wastewater carrying granular sludge into the three-phase separator due to excessive flow rate, and prevent the loss of granular sludge, especially during the cultivation period, by controlling the rising flow rate, the formation of granular sludge can be accelerated, and the granular sludge can also be prevented from being broken by the paddles, so as to improve the treatment efficiency; at the same time, it is also avoided that the overall efficiency of the reactor decreases due to too slow flow rate, which cannot meet the production needs.

2. The upper section and the lower section of the sludge return pipe are separately connected, which is convenient for installing the motor mounting frame and also for separate replacement.

3. By setting the nozzle, the spraying speed of the mixed liquid can be accelerated, thereby forming a negative pressure effect in the anaerobic sludge bed and accelerating the mixing between the mixed liquid and the anaerobic sludge bed.

4. The staggered arrangement of nozzles on two adjacent layers can improve the uniformity of water distribution.

5. When the wastewater enters the water distribution drum, a vortex is formed, which accelerates the mixing speed of the wastewater and sludge.

BRIEF DESCRIPTION OF THE DRAWINGS

By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

FIG1 is a schematic diagram of the structure of a loop anaerobic reactor in the prior art;

FIG2 is a schematic diagram of the structure of a novel anaerobic reactor with controllable operating status;

FIG3 is an enlarged view of point A in FIG2 ;

FIG4 is a front view of a water distribution cylinder and a nozzle assembly in a novel anaerobic reactor with controllable operating status;

Fig. 5 is a cross-sectional view of the section B-B in Fig. 4 (the flow path is shown in the figure);

FIG6 is a top view of a water distribution cylinder and a nozzle assembly in a novel anaerobic reactor with controllable operating status;

FIG7 is a schematic diagram showing the flow path of the upper part of the novel anaerobic reactor with controllable operation status;

FIG8 is a schematic diagram showing the flow path of the lower half of the novel anaerobic reactor with controllable operating status.

Description of reference numerals:

100. guide tube; 200. stirring device;

1. Tank body; 2. Water distribution cylinder; 3. Wastewater inlet pipe; 4. Recirculator; 41. Motor; 42. Paddle; 5. Control unit; 6. Large particle anaerobic sludge bed; 7. Small particle anaerobic sludge bed; 8. Separation cylinder; 81. Straight cylinder part; 82. Conical cylinder part; 83. Clean water area; 84. Sludge area; 9. Guide plate; 10. Water collecting trough; 11. Drain pipe; 12. Center pipe; 13. Inlet; 14. Sludge return hole; 15. One-step separation area; 16. Nozzle; 17. Upper section of return pipe; 18. Lower section of return pipe; 19. First flow meter; 20. Second flow meter; 21. Support frame.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

Embodiments of the novel anaerobic reactor with controllable operating state provided by the present invention:

As shown in Figures 2 to 8, the new anaerobic reactor with controllable operation status includes a tank body 1, an anaerobic sludge bed, a three-phase separator, a reflux channel, a wastewater inlet pipe 3, a reflow device 4, a flow rate detection device and a control unit 5. The anaerobic sludge bed is filled in the tank body 1; the three-phase separator is installed on the upper part of the tank body 1 to achieve solid, liquid and gas three-phase separation; the reflux channel includes a water distribution cylinder 2 and a sludge reflux pipe, the water distribution cylinder 2 is installed at the bottom of the tank body 1, and the wastewater inlet pipe 3 is connected to the water distribution cylinder 2 to introduce wastewater into the water distribution cylinder 2; the sludge reflux pipe connects the three-phase separator and the water distribution cylinder 2, and the sludge in the three-phase separator flows back to the water distribution cylinder 2 and mixes with the wastewater in the water distribution cylinder 2, and the formed mixed liquid then enters the anaerobic sludge bed; the reflow device 4 is located in the reflow pipe to control the flow rate of sludge reflux.

The tank body 1 extends up and down, and a biogas outlet is provided at the top.

The anaerobic sludge bed is divided into a large particle anaerobic sludge bed 6 at the bottom and a small particle anaerobic sludge bed 7 at the top. The particle size of the granular sludge in the large particle anaerobic sludge bed 6 is larger than that in the small particle anaerobic sludge bed 7.

As shown in Figure 2, the three-phase separator includes a separation cylinder 8, a guide plate 9, a water collecting trough 10, a drain pipe 11, and a center pipe 12. The guide plate 9 is fixed to the outside of the separation cylinder 8, the center pipe 12 is located inside the separation cylinder 8 and passes downward through the separation cylinder 8, the water collecting trough 10 is fixed to the upper part of the center pipe 12, and the drain pipe 11 is connected to the water collecting trough 10.

The separation cylinder 8 includes an upper straight cylinder portion 81 and a lower conical cylinder portion 82. The straight cylinder portion 81 and the conical cylinder portion 82 are connected and interconnected internally. The diameter of the conical cylinder portion 82 gradually decreases from top to bottom. It should be noted that the straight cylinder portion 81 and the conical cylinder portion 82 can be processed as a whole or assembled together after being processed separately. The upper part of the straight cylinder portion 81 is fixedly mounted on the upper part of the tank body 1. The straight cylinder portion 81, the inner wall of the tank body 1, and the upper part of the tank body 1 together form a one-step separation zone 15, which is used to separate gas from solid and liquid. The biogas and wastewater rising from the bottom carry the sludge and rise together. After entering the one-step separation zone 15, the biogas rises and synthesizes large bubbles, which eventually burst and diffuse from the water into the closed air chamber in the upper space of the one-step separation zone 15, and are finally discharged from the biogas outlet at the upper part of the tank body 1.

An inlet 13 is provided on the bottom side of the straight cylinder part 81, and the inlet 13 connects the inside and outside of the straight cylinder part 81. The solid-liquid mixture enters the straight cylinder part 81 through the inlet 13, and the sludge sinks into the conical cylinder part 82. The interior of the separation cylinder 8 is divided into two separation zones for solid-liquid separation, forming an upper clear water zone 83 and a lower sludge zone 84 in the separation cylinder 8. There are multiple inlets 13 and they are arranged at intervals around the axis of the separation cylinder 8. The bottom of the guide plate 9 is fixedly installed on the separation cylinder 8, and the bottom of the guide plate 9 is located below the inlet 13. The guide plate 9 is arranged from top to bottom and tilted toward the axis of the separation cylinder 8, which can guide the solid-liquid mixture to flow to the inlet 13.

The central tube 12 is coaxially arranged with the separation cylinder 8. The upper end of the central tube 12 is fixedly mounted on the tank body 1, and the lower end passes through the separation cylinder 8 downward. The central tube 12 is fixed together with the conical cylinder part 82 and sealed. A sludge return hole 14 is opened on one side of the central tube 12. The sludge return hole 14 corresponds to the sludge area 84 in the separation cylinder 8, and can allow the sinking sludge to enter the central tube 12. The bottom of the central tube 12 is a sludge outlet.

The water collecting tank 10 is fixedly installed on the upper part of the central tube 12, located in the clean water area 83 in the separation cylinder 8. One end of the drain pipe 11 is connected to the water collecting tank 10, and the other end extends to the outside of the tank body 1, so as to discharge the clean water in the water collecting tank 10.

As shown in Figures 2 to 6, the bottom of the water distribution cylinder 2 is fixedly mounted on the tank body 1 and is sealed and connected to the tank body 1. A sludge inlet is provided at the top of the water distribution cylinder 2, and a mixed liquid outlet is provided at the side of the water distribution cylinder 2. A nozzle 16 is installed at the mixed liquid outlet, and the nozzle 16 is arranged downwardly tilted. The inner diameter of the nozzle 16 gradually decreases from top to bottom, which can increase the speed of the mixed liquid spraying and form a negative pressure area near the nozzle 16.

The nozzles 16 are arranged in two layers, upper and lower, and each layer of nozzles 16 has a plurality of nozzles 16 arranged circumferentially around the water distribution cylinder 2. The two layers of nozzles 16 are staggered, and the mixed liquid flows out more evenly.

The wastewater inlet pipe 3 extends along the tangent direction of the water distribution cylinder 2, so that the wastewater forms a vortex when entering the water distribution cylinder 2, which can accelerate the mixing of the wastewater and the sludge.

The sludge return pipe connects the sludge outlet of the central pipe 12 and the sludge inlet of the water distribution cylinder 2. The sludge return pipe and the central pipe 12, as well as the sludge return pipe and the water distribution cylinder 2 are sealed together. The sludge return pipe is a circumferentially closed structure to prevent the granular sludge in the anaerobic sludge bed from directly entering the sludge return pipe and the water distribution cylinder 2. Granular sludge can be quickly formed during the initial cultivation of the reactor, and the granular sludge can be prevented from being broken up.

The sludge return pipe is a split structure, including an upper section 17 and a lower section 18, which are connected by flanges, the upper section 17 is connected to the central pipe 12 by flanges, and the lower section 18 is connected to the water distribution cylinder 2 by flanges. Of course, in other embodiments, the sludge return pipe can be an integrated structure.

The reflow device 4 is located in the sludge return pipe, which is a large flow and low speed working mode. The reflow device 4 can adjust the flow in the sludge return pipe, thereby changing the flow rate of the mixed liquid in the anaerobic sludge bed. As shown in Figure 3, the reflow device 4 includes a motor 41. The motor 41 and the upper section 17 of the return pipe are spaced apart from each other to form an annular space for the sludge to pass through. A paddle 42 is fixedly installed on the motor output shaft of the motor 41. When the motor 41 drives the paddle 42 to rotate, the sludge can be pressurized to make the sludge flow downward. By changing the speed of the motor 41, the rotation speed of the paddle 42 can be changed, thereby changing the speed of the sludge flowing downward.

Specifically, a support frame 21 is fixedly installed on the inner side of the bottom of the upper section 17 of the return pipe, and the motor 41 is fixedly installed in the middle position of the support frame 21. The support frame 21 itself has a channel for the sludge to flow downward. For example, the support frame 21 can be composed of three or four support rods, and a channel is formed between adjacent support rods for the sludge to pass through.

The flow velocity detection device includes a first flow meter 19 and a second flow meter 20. The lower ends of the first flow meter 19 and the second flow meter 20 are detection ends, and the detection ends are located in the anaerobic sludge bed. The detection end of the first flow meter 19 is located below the detection end of the second flow meter 20, and the flow velocity of the mixed liquid at different height positions in the anaerobic sludge bed is detected.

The control unit 5 includes a PLC controller and a frequency conversion controller, the PLC controller and the frequency conversion controller are electrically connected, the PLC controller is electrically connected to the first flow meter 19 and the second flow meter 20, and the frequency conversion controller is electrically connected to the motor 41. The PLC controller can collect data from the first flow meter 19 and the second flow meter 20 and compare and analyze them with the set value, and output an adjustment signal to the frequency conversion controller, and the frequency conversion controller adjusts the speed of the motor 41.

The working process of the present invention is as shown in Figures 7 and 8. After being pressurized, the wastewater enters the water distribution cylinder 2 through the wastewater inlet pipe 3, and mixes with the sludge returned through the sludge return pipe. The formed mixed liquid is sprayed into the anaerobic sludge bed through the nozzle 16. The mixed liquid is evenly distributed at a certain flow rate, so that the sludge in the anaerobic sludge bed is in an expanded state, and finally the wastewater and the anaerobic sludge are fully mixed and contacted, and the organic matter in the wastewater is anaerobically treated and biogas is produced. The biogas rises together with the sludge carried by the wastewater, forming a flocculent sludge mixing zone above the anaerobic sludge bed, and then flows upward to the upper part of the tank body 1, and enters the one-step separation zone 15 to realize the separation of gas and solid-liquid, and the biogas expands from the water to the closed air chamber at the upper part of the tank body 1, and is discharged from the biogas outlet. The wastewater and the sludge it carries are guided by the guide plate 9 into the separation cylinder 8, where the sludge naturally settles to achieve solid-liquid separation, and the liquid level of the clean water gradually rises and enters the sump 10 and flows out from the drain pipe 11; the sludge at the bottom of the separation cylinder 8 enters the central pipe 12, the recirculator 4 pressurizes the sludge, and the sludge returns to the water distribution cylinder 2 through the sludge return pipe.

During operation, the control unit 5 can dynamically adjust the speed of the motor 41 according to the data of the first flow meter 19 and the second flow meter 20. Specifically, in order to meet the startup debugging and normal operation of the new anaerobic reactor with controllable operating status, a debugging mode and an operating mode are usually set.

In the debugging mode, since the new anaerobic reactor with controllable operation status has just started, the sludge is in the cultivation and acclimatization period, the biogas production is small, and the gas lift internal reflux cannot be formed. In the debugging mode, the wastewater inflow increases slowly from small to large, and the wastewater cannot be evenly distributed. The mud and water are not in sufficient contact, and the dead zone area is large, resulting in a long debugging cycle. In order to ensure that the anaerobic sludge bed in the new anaerobic reactor with controllable operation status can fully contact with the wastewater, a larger reflux is used to increase the flow rate, so that granular sludge can be quickly formed in the tank body 1. At this time, the flow rate is detected by the first flow meter 19, and the control unit 5 adjusts the speed of the motor 41 according to the data of the first flow meter 19; under normal circumstances, the flow rate of the control unit 5 is preset to 2m/h, and the fluctuation range is 0.5m/h, that is, the control value is 1.5-2.5m/h.

When in operation mode, since debugging has been completed, the performance of anaerobic microorganisms is in normal state, and the wastewater treatment capacity is normal. At this time, the flow rate is detected by the second flow meter 20, and the controller adjusts the speed of the motor 41 according to the data of the second flow meter 20 to achieve reflux volume regulation. When the rising flow rate of the mixed liquid in the anaerobic sludge bed is higher than the set upper limit value, the speed of the motor 41 is lowered to reduce the reflux volume; when the rising flow rate is lower than the set lower limit value, the speed of the motor 41 is increased to increase the reflux volume, ensuring that the rising flow rate of the mixture in the anaerobic sludge bed is within the set control range. In actual use, the controller's flow rate preset value is 6m/h, and the fluctuation range is 1m/h, that is, the control value is 5-7m/h.

The present invention dynamically adjusts the flow rate in the anaerobic sludge bed through a flow rate detection device, a control unit 5, and a motor 41. In the debugging mode, the flow rate is ensured not to be too fast to impact the microorganisms, thereby accelerating the formation rate of granular sludge. In the operating mode, the flow rate is ensured to be within the set range to prevent the flow rate from being too fast and impacting the granular sludge, resulting in the loss of the sludge bed, and to reduce or even prevent the granular sludge from entering the three-phase separator and then entering the recirculator 4 to be broken; it also avoids the situation where the contact time between wastewater and microorganisms is too short due to the excessive flow rate; and it also avoids the decrease in efficiency due to the slow flow rate.

In other embodiments, the number of flow meters in the flow velocity detection device can be increased according to actual conditions. For example, in order to improve the detection accuracy, several flow meters can be provided to obtain the flow velocity of the mixed liquid by taking the average value or the like.

According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and the like, which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims (8)

1. A novel anaerobic reactor with controllable operation state, comprising:

a tank having an anaerobic sludge bed composed of granular sludge;

the three-phase separator is arranged at the upper part of the tank body and is used for realizing solid, liquid and gas three-phase separation;

characterized by further comprising:

The reflux channel comprises a water distribution cylinder and a sludge reflux pipe, the bottom of the water distribution cylinder is hermetically assembled in the tank body, the periphery of the sludge reflux pipe is sealed, two ends of the sludge reflux pipe are hermetically connected with a three-phase separator and the water distribution cylinder, the three-phase separator, the sludge reflux pipe and the water distribution cylinder form a sealed sludge reflux path so as to prevent granular sludge from directly entering the reflux channel, one side of the water distribution cylinder is provided with a wastewater inlet pipe extending to the outside of the tank body, and the side part of the water distribution cylinder is provided with a mixed liquid ejection port;

The reflux device is positioned in the sludge reflux pipe and is used for pressurizing and downwards conveying the sludge, and comprises a motor and a paddle connected to an output shaft of the motor;

The flow velocity detection device is used for detecting the flow velocity of the mixed liquid in the anaerobic sludge bed;

and the control unit is connected with the flow rate detection device and the motor and is used for adjusting the rotating speed of the motor according to the detection value of the flow rate detection device so as to change the flow rate of the sludge in the sludge return pipe, thereby limiting the flow rate of the mixed liquid in the anaerobic sludge bed within a set range.

2. The novel anaerobic reactor with controllable running state according to claim 1, wherein the flow rate detecting device comprises a first flow rate meter and a second flow rate meter, the detecting end of the first flow rate meter is located below the detecting end of the second flow rate meter, the first flow rate meter is used for detecting the flow rate of the mixed liquid in the debugging mode, and the second flow rate meter is used for detecting the flow rate of the mixed liquid in the running mode.

3. The novel anaerobic reactor with controllable running state according to claim 2, wherein the anaerobic sludge bed comprises a large granular anaerobic sludge bed below and a small granular anaerobic sludge bed above, the detection end of the first flow rate meter is positioned in the large granular anaerobic sludge bed, and the detection end of the second flow rate meter is positioned in the small granular anaerobic sludge bed.

4. A novel anaerobic reactor with controllable running state according to claim 1, 2 or 3, wherein a motor mounting frame is arranged in the sludge return pipe, the motor is fixedly arranged on the motor mounting frame, and the motor mounting frame is provided with a passage for sludge to pass through.

5. The novel anaerobic reactor with controllable running state according to claim 4, wherein the sludge return pipe comprises an upper section and a lower section of the return pipe which are connected in an upper-lower split manner, and the motor mounting frame is arranged at the bottom of the upper section of the return pipe.

6. A novel anaerobic reactor with controllable running state according to claim 1,2 or 3, wherein the mixed liquor outlet of the water distribution cylinder is provided with a nozzle which is arranged obliquely downwards to spray out the mixed liquor.

7. The novel anaerobic reactor with controllable running state according to claim 6, wherein the nozzles are arranged at least two layers at intervals along the up-down direction, and the nozzles of two adjacent layers are staggered.

8. The novel anaerobic reactor with controllable running state according to claim 6, wherein the wastewater inlet pipe is arranged at the bottom of the water distribution cylinder and extends along the tangential direction of the water distribution cylinder.