Three-phase separation system for granular sludge reactor

Abstract

The utility model provides a three-phase separation system for a granular sludge reactor, which comprises a three-phase separation unit and a granular sludge reflux unit, and a three-phase separation screening structure in the three-phase separation unit intercepts and screens sewage which is discharged from a water outlet of the granular sludge reactor and carries bubbles and granular sludge. The outlet water without bubbles and granular sludge is output through a pipeline, and the granular sludge falls into a granular sludge collecting hopper, then enters a granular sludge storage tank and flows back to the granular sludge reactor through a granular sludge return pipeline under the action of a return driving device. The three-phase separation effect is achieved within 6 seconds, and the three-phase separation device is suitable for three-phase separation scenes of granular sludge reactors for biochemical reactions such as anaerobic reaction, denitrification reaction, aerobic reaction and anaerobic ammonia oxidation reaction.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a three-phase separation system for granular sludge reactors. Background Technology

[0002] In water treatment engineering in the environmental protection industry, three-phase separators are a commonly used structure with various forms. Their core function is to separate the gas, water and sludge phases in the effluent of the biochemical reactor, allowing the gas to be discharged, the granular sludge to fall back to the reaction zone, and the wastewater to flow out normally.

[0003] Three-phase separators are widely used in water treatment engineering. They are not only used in high-efficiency anaerobic reactors (UASB, EGSB, IC, etc.), but also in high-efficiency denitrification reactors (denitrification granular sludge fluidized bed). In recent years, they have also been used in short-cut nitrification and denitrification, anaerobic ammonia oxidation and aerobic granular sludge reactors.

[0004] However, existing three-phase reactors have some problems:

[0005] 1. When a large amount of granular sludge floats to the surface, it will exceed the processing load of the three-phase separator, causing the three-phase separator to become clogged and thus lose its three-phase separation function;

[0006] 2. Sludge with air bubbles can only be passively degassed. Sludge with air bubbles floats to the three-phase separator and degassed on its own with a certain probability. The degassed capacity is poor and the speed is slow.

[0007] 3. The existing three-phase separator is located inside the reactor, which occupies the cross-sectional area of ​​the flow path, increases the flow velocity, and is not conducive to the natural settling of granular sludge.

[0008] 4. The three-phase separator occupies the longitudinal height inside the reactor, reducing the reactor space utilization rate.

[0009] Therefore, we continue to research and design a three-phase separation system that has high separation efficiency, does not occupy reactor space, and has a wide range of applications, in order to overcome the limitations of existing three-phase separators. Utility Model Content

[0010] To address the problems of low separation efficiency, low processing load, and excessive internal space occupation in existing three-phase reactors, this invention provides a three-phase separation system for granular sludge reactors. The system includes a three-phase separation unit and a granular sludge recirculation unit. The three-phase separation unit features a specially structured three-phase separation screening structure that intercepts and screens air bubbles and granular sludge carried in the wastewater discharged from the granular sludge reactor's effluent. The granular sludge is rapidly separated from the attached air bubbles. The effluent, free of air bubbles and granular sludge, is output through a pipeline system, while the granular sludge falls into a granular sludge collection hopper under its own gravity and water flow, subsequently entering a granular sludge storage tank. Under the action of a recirculation drive device, it is recirculated back to the granular sludge reactor through a granular sludge recirculation pipeline. This three-phase separation system operates efficiently and stably, does not occupy the internal reaction space of the granular sludge reactor, and is suitable for three-phase separation scenarios in granular sludge reactors involved in anaerobic, denitrification, aerobic, and anaerobic ammonia oxidation biochemical reactions, with a wide range of applications.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A three-phase separation system for a granular sludge reactor includes: a three-phase separation unit and a granular sludge recirculation unit; the three-phase separation unit includes a three-phase separation screening structure, the function of which is to screen out granular sludge from the reactor effluent, the surface of which is smooth enough for the granular sludge to roll on its surface; the granular sludge recirculation unit includes a granular sludge storage tank, a granular sludge recirculation pipeline, and a recirculation drive device; the granular sludge storage tank is used to store the granular sludge screened out by the three-phase separation screening structure; the granular sludge recirculation pipeline connects the granular sludge storage tank and the granular sludge reactor to recirculate the granular sludge back to the granular sludge reactor; the recirculation drive device is used to provide power for the granular sludge recirculation.

[0013] In some embodiments, the three-phase separation screening structure is inclined and the angle between it and the horizontal plane is 10 to 80°; the downward inclined end of the three-phase separation screening structure faces the opening of the granular sludge storage tank.

[0014] In some embodiments, the three-phase separation unit further includes: a granular sludge collection hopper and an effluent collection hopper, wherein one end of the three-phase separation screening structure is inclined downward toward the opening of the granular sludge collection hopper, the granular sludge collection hopper is used to collect the granular sludge screened out by the three-phase separation screening structure, and the outlet of the granular collection hopper is connected to the granular sludge storage tank; the effluent collection hopper is located below the three-phase separation screening structure and is used to collect the effluent after the granular sludge has been removed.

[0015] In some embodiments, the angle between the three-phase separation sieve structure and the horizontal plane is 30 to 60°.

[0016] In some embodiments, the reflux drive device is a wastewater reflux pump for pumping reflux wastewater into the granular sludge storage tank, or a blower for introducing compressed gas into the granular sludge storage tank.

[0017] In some embodiments, the aperture of the three-phase separation sieve structure is 0.01–20 mm.

[0018] In some embodiments, the three-phase separation unit further includes: an inlet pipe, the inlet of which is connected to the outlet of the granular sludge reactor, and the outlet of which faces the three-phase separation screening structure; the vertical distance between the outlet of the inlet pipe and the outlet of the granular sludge reactor is greater than 0.02m.

[0019] In some embodiments, the three-phase separation system further includes: a pressure gauge, a first automatic valve, a second automatic valve, and a control unit. The pressure gauge is installed on the granular sludge storage tank to detect the pressure inside the granular sludge storage tank. The first automatic valve is installed on the pipeline between the granular collection hopper and the granular sludge storage tank. The second automatic valve is installed on the granular sludge return pipeline. The control unit is electrically connected to the pressure gauge, the first automatic valve, and the second automatic valve, and controls the opening and closing of the first automatic valve and the second automatic valve according to the pressure change inside the granular sludge storage tank.

[0020] In some embodiments, the volume of the granular sludge storage tank is 0.1% to 20% of the effective volume of the granular sludge reactor.

[0021] In some embodiments, the granular sludge return unit further includes a granular sludge discharge pipeline connected to the granular sludge storage tank, used to discharge aged granular sludge from the granular sludge storage tank.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the three-phase separation system provided by this utility model, the gravity of the effluent from the granular sludge reactor is fully utilized. Through the interception and screening effect of the three-phase separation screening structure, the granular sludge with air bubbles above a certain particle size is intercepted and then flushed by the effluent, which forces the granular sludge to be quickly separated from the air bubbles it adheres to, thus achieving a rapid three-phase separation effect with high efficiency and no clogging.

[0024] 2. The three-phase separation system provided by this utility model does not occupy the cross-sectional area of ​​the sewage rising channel inside the granular sludge reactor, which is conducive to maintaining a good rising flow rate and flow pattern, and does not occupy the internal longitudinal height of the granular sludge reactor, thereby improving the volume utilization efficiency of the reactor.

[0025] 3. The reflux drive device provided by this utility model only uses fluid to indirectly drive the granular sludge during the reflux process, without directly acting on the granular sludge to destroy its structure, thus realizing the non-destructive reflux of granular sludge.

[0026] 4. The three-phase separation system provided by this utility model has a high degree of automation. The connecting pipeline between the granular sludge collection hopper and the granular sludge storage tank, as well as the granular sludge return pipeline, are all equipped with automatic valves. The storage and return processes of the granular sludge are automatically controlled according to the pressure changes in the granular sludge storage tank. It is easy to use and operate, and greatly improves the efficiency of sewage treatment.

[0027] 5. The three-phase separation system provided by this utility model has a wide range of applications and is suitable for three-phase separation scenarios in biochemical granular sludge reactors such as anaerobic, facultative anaerobic, denitrification, aerobic and anaerobic ammonia oxidation. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] Figure 1 This is a schematic diagram of the three-phase separation system provided by this utility model.

[0030] The meanings of the symbols in the attached diagram are as follows:

[0031] 100—Granular sludge reactor; 101—Inlet; 102—Outlet; 103—Sludge return outlet;

[0032] 200—Three-phase separation unit; 201—Inlet pipe; 202—Three-phase separation screening structure; 203—Granular sludge collection hopper; 204—Outlet water collection hopper; 205—First automatic valve; 300—Granular sludge return unit; 301—Granular sludge storage tank; 302—Granular sludge return pipeline; 303—Second automatic valve; 304—Sewage return pump; 305—Pressure gauge; 306—Granular sludge discharge pipeline; 307—Third valve; 308—Fourth valve. Detailed Implementation

[0033] The present invention will be further explained in detail below with reference to the accompanying drawings and specific embodiments. However, the following description of the embodiments is only intended to enable those skilled in the art to better understand the principles and essence of the present invention, and does not imply any limitation on the present invention.

[0034] Example 1

[0035] like Figure 1As shown, this utility model provides a three-phase separation system for granular sludge reactors, including a three-phase separation unit 200 and a granular sludge return unit 300, specifically:

[0036] The granular sludge reactor 100 is provided with an inlet 101, an outlet 102 and a sludge return outlet 103. The inlet 101 and the sludge return outlet 103 are both located at the bottom of the granular sludge reactor 100, while the outlet 102 is located at the top of the granular sludge reactor 100.

[0037] The three-phase separation unit 200 is connected to the outlet 102. The three-phase separation unit 200 includes a three-phase separation screening structure 202. The three-phase separation screening structure 202 has a small hole structure similar to a screen, which is used to screen out the granular sludge in the effluent of the granular sludge reactor 100. The effluent after removing the granular sludge can be directly returned to the granular sludge reactor 100 as return water, or it can be used for other purposes. The screening and interception function of the three-phase separation screening structure 202 can also separate the granular sludge from the air bubbles it adheres to, so as to realize the three-phase separation of gas, solid and liquid.

[0038] The granular sludge return unit 300 is located downstream of the three-phase separation unit 200. The granular sludge return unit 300 includes a granular sludge storage tank 301, a granular sludge return pipeline 302, and a return drive device. The granular sludge storage tank 301 is used to store the granular sludge screened out by the three-phase separation screening structure 202.

[0039] The granular sludge return pipeline 302 connects the granular sludge storage tank 301 and the granular sludge reactor 100. That is, the two ends of the granular sludge return pipeline 302 are respectively connected to the bottom outlet of the granular sludge storage tank 301 and the sludge return port 103 of the granular sludge reactor 100, so as to return the granular sludge to the granular sludge reactor 100.

[0040] The aforementioned reflux drive device is used to provide power for the reflux of granular sludge.

[0041] Furthermore, the three-phase separation screening structure 202 is inclined, with the downward inclined end of the three-phase separation screening structure 202 facing the opening of the granular sludge storage tank 301. Under the action of gravity and the flushing action of the effluent, the granular sludge on the three-phase separation screening structure 202 falls into the granular sludge storage tank 301.

[0042] The angle between the inclined three-phase separation screening structure 202 and the horizontal plane is 10-80°, and the angle between the three-phase separation screening structure 202 and the horizontal plane is preferably 30-60°.

[0043] Preferably, the volume of the granular sludge storage tank 301 is 0.5% to 2% of the effective volume of the granular sludge reactor 100.

[0044] In some embodiments, the three-phase separation unit 200 further includes a granular sludge collection hopper 203 and an effluent collection hopper 204.

[0045] The three-phase separation screening structure 202 has one inclined downward end facing the opening of the granular sludge collection hopper 203. The outlet of the granular sludge collection hopper 203 is connected to the granular sludge storage tank 301. The granular sludge screened by the three-phase separation screening structure 202 first falls into the granular sludge collection hopper 203, and then the collected granular sludge is sent to the granular sludge storage tank 301 for storage. Preferably, in the vertical direction, the granular sludge storage tank 301 is located below the outlet of the granular collection hopper 203, so that the granular sludge can fall into the granular sludge storage tank 301 for storage by its own gravity.

[0046] The effluent collection hopper 204 is located at the bottom of the three-phase separation screening structure 202 and is used to collect the effluent after the removal of particulate sludge.

[0047] In some embodiments, the main function of the reflux drive device is to provide the driving force for the granular sludge in the granular sludge storage tank 301 to flow back to the granular sludge reactor 100. Therefore, there are many options for the reflux drive device. It can be a wastewater reflux pump 304 (centrifugal pump, diaphragm pump, etc.). The wastewater reflux pump 304 pumps the reflux wastewater into the granular sludge storage tank 301, and then flushes the granular sludge into the granular sludge reactor 100. The reflux drive device can also be a blower, which introduces compressed gas into the granular sludge storage tank 301 and uses the compressed gas to press the granular sludge into the granular sludge reactor 100. The reflux drive device can also be directly replaced by a compressed gas input pipeline.

[0048] Preferably, a third valve 307 is also provided on the pipeline between the wastewater return pump 304 and the granular sludge storage tank 301 to control the return water entering the granular sludge storage tank 301. The third valve 307 can be mechanical or electronic.

[0049] In some embodiments, the material of the three-phase separation sieve structure 202 can be metal, non-metal, or a combination of metal and non-metal.

[0050] The aperture shape of the three-phase separation screening structure 202 can be rectangular, but is not limited to rectangular. It can also be circular, rhomboid, etc. This utility model does not limit the aperture shape of the three-phase separation screening structure 202.

[0051] The aperture of the three-phase separation sieve structure 202 is 0.01-20mm.

[0052] Preferably, the aperture of the three-phase separation sieve structure 202 is 2-0.5 mm.

[0053] In some embodiments, the three-phase separation unit 200 further includes an inlet pipe 201, the inlet of which is connected to the outlet 102 of the granular sludge reactor 100, the outlet of the inlet pipe 201 is directed toward the three-phase separation screening structure 202, and the outlet of the inlet pipe 201 is directed toward the three-phase separation screening structure 202. Most preferably, the outlet of the inlet pipe 201 is vertically downward.

[0054] The vertical distance h between the outlet of the inlet pipe 201 and the outlet 102 is greater than 0.02m.

[0055] Preferably, the vertical distance h between the outlet of the inlet pipe 201 and the outlet 102 is greater than 0.2m.

[0056] In some embodiments, the three-phase separation system further includes: a pressure gauge 305, a first automatic valve 205, a second automatic valve 303, and a control unit. The pressure gauge 305 is installed on the granular sludge storage tank 305 to detect the pressure inside the granular sludge storage tank 305. The first automatic valve 205 is installed on the pipeline between the granular collection hopper 203 and the granular sludge storage tank 301 to control the amount of granular sludge delivered from the granular collection hopper 203 to the granular sludge storage tank 301 and to start and stop the delivery process. The second automatic valve 303 is installed on the granular sludge return pipeline 302 to control the amount of granular sludge returned to the granular sludge reactor 100 and to start and stop the return process.

[0057] The control unit is electrically connected to the pressure gauge 305, the first automatic valve 205, and the second automatic valve 303 respectively. The control unit controls the opening and closing of the first automatic valve 205 and the second automatic valve 303 according to the pressure change in the granular sludge storage tank 301.

[0058] In some embodiments, the granular sludge return unit further includes a granular sludge discharge pipeline 306 connected to the granular sludge storage tank 301. As the processing time increases, the granular sludge in the granular sludge reactor 100 ages. The aged granular sludge screened out by the three-phase separation screening structure 202 falls into the granular sludge storage tank 301 and can eventually be discharged through the granular sludge discharge pipeline 306.

[0059] A fourth valve 308 is provided on the granular sludge discharge pipeline 306 to control the discharge process of granular sludge. The fourth valve 308 can be mechanical or electronic.

[0060] The operation process of the three-phase separation system provided in this embodiment is as follows:

[0061] The effluent mixed with floating granular sludge flows out from the outlet 102 of the granular sludge reactor 100, falls into the three-phase separation screening structure 202 through the inlet pipe 201, and under the screening action of the three-phase separation screening structure 202, the granular sludge is intercepted and rolls into the granular sludge collection hopper 203 along the inclined surface of the three-phase separation screening structure 202, while the effluent flows directly into the effluent collection hopper 204 through the screen holes, and is then discharged through the pipeline. The granular sludge in the granular sludge collection hopper 203 slides into the granular sludge storage tank 301 under the action of gravity.

[0062] As the operating time increases, the sludge level in the granular sludge storage tank 301 rises, and the reading on the pressure gauge 305 on the granular sludge storage tank 301 increases. When the reading on the pressure gauge 305 exceeds the set value, the wastewater return pump 304 automatically opens, while the first automatic valve 205 closes and the second automatic valve 303 automatically opens. Subsequently, the wastewater return pump 304 starts and continues for a set time, pumping back water to force the granular sludge in the granular sludge storage tank 301 into the granular sludge reactor 100, completing the sludge return. Then, the wastewater return pump 304 closes, while the second automatic valve 303 automatically closes and the first automatic valve 205 automatically opens to continue collecting granular sludge. This process is repeated continuously to achieve lossless return of granular sludge.

[0063] Example 2

[0064] The granular sludge reactor 100 provided in this embodiment is an anaerobic reactor with an influent flow rate of 10 m³ / h. 3 The vertical distance between the inlet pipe 201 and the outlet 102 of the granular sludge reactor 100 is 3.5m. The outlet of the inlet pipe 201 faces the three-phase separation screen structure 202, the flow velocity is 2.5m / s, the aperture of the three-phase separation screen structure 202 is 1.4mm, the three-phase separation screen structure 202 is inclined and the angle with the horizontal plane is 50°, and the dimensions of the three-phase separation screen structure 202 are: length 1.4m and width 0.5m.

[0065] The volume of granular sludge storage tank 301 is 1.2% of the effective volume of granular sludge reactor 100.

[0066] Example 3

[0067] The granular sludge reactor 100 provided in this embodiment is an anaerobic reactor with an influent flow rate of 2.0 m³ / h. 3The vertical distance between the three inlet pipes 201 and the outlet 102 of the granular sludge reactor 100 is 4.5m. The outlet of the inlet pipe 201 faces the three-phase separation screen structure 202, the flow velocity is 1.5m / s, the aperture of the three-phase separation screen structure 202 is 1.2mm, the three-phase separation screen structure 202 is inclined and the angle with the horizontal plane is 45°, and the dimensions of the three-phase separation screen structure 202 are: length 1.2m and width 0.4m.

[0068] The volume of granular sludge storage tank 301 is 1% of the effective volume of granular sludge reactor 100.

[0069] The preferred embodiment of this utility model is provided as an inspiration. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model.

[0070] The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A three-phase separation system for granular sludge reactors, Its features are, Includes: a three-phase separation unit and a granular sludge return unit; The three-phase separation unit includes a three-phase separation screening structure. The function of the three-phase separation screening structure is to screen out the granular sludge in the reactor effluent. The smoothness of its surface is sufficient to allow the granular sludge to roll on its surface. The granular sludge recirculation unit includes a granular sludge storage tank, a granular sludge recirculation pipeline, and a recirculation drive device. The granular sludge storage tank is used to store the granular sludge screened out by the three-phase separation screening structure. The granular sludge return pipeline connects the granular sludge storage tank and the granular sludge reactor to return the granular sludge to the granular sludge reactor. The reflux drive device is used to provide power for the reflux of granular sludge.

2. The three-phase separation system according to claim 1, characterized in that, The three-phase separation screening structure is inclined, and the angle between it and the horizontal plane is 10~80°; The three-phase separation screening structure has one end tilted downwards, facing the opening of the granular sludge storage tank.

3. The three-phase separation system according to claim 2, characterized in that, The three-phase separation unit further includes: a granular sludge collection hopper and an effluent collection hopper. The three-phase separation screening structure has one inclined downward end facing the opening of the granular sludge collection hopper. The granular sludge collection hopper is used to collect the granular sludge screened out by the three-phase separation screening structure. The outlet of the granular sludge collection hopper is connected to the granular sludge storage tank. The effluent collection hopper is located below the three-phase separation and screening structure and is used to collect the effluent after the removal of particulate sludge.

4. The three-phase separation system according to claim 1, characterized in that, The reflux drive device is a wastewater reflux pump for pumping reflux wastewater into the granular sludge storage tank, or a blower for introducing compressed gas into the granular sludge storage tank.

5. The three-phase separation system according to any one of claims 1-4, characterized in that, The aperture of the three-phase separation sieve structure is 0.01-20 mm.

6. The three-phase separation system according to any one of claims 1-4, characterized in that, The three-phase separation unit further includes: an inlet pipe, the inlet of which is connected to the outlet of the granular sludge reactor, and the outlet of which faces the three-phase separation screening structure; The vertical distance between the outlet of the inlet pipe and the outlet of the granular sludge reactor is greater than 0.02m.

7. The three-phase separation system according to claim 3, characterized in that, The three-phase separation system also includes: a pressure gauge, a first automatic valve, a second automatic valve, and a control unit. The pressure gauge is installed on the granular sludge storage tank and is used to detect the pressure inside the granular sludge storage tank; The first automatic valve is installed on the pipeline between the granular sludge collection hopper and the granular sludge storage tank; The second automatic valve is installed on the granular sludge return pipeline; The control unit is electrically connected to the pressure gauge, the first automatic valve, and the second automatic valve, respectively. The control unit controls the opening and closing of the first automatic valve and the second automatic valve according to the pressure changes in the granular sludge storage tank.

8. The three-phase separation system according to claim 1, characterized in that, The volume of the granular sludge storage tank is 0.1% to 20% of the effective volume of the granular sludge reactor.

9. The three-phase separation system according to claim 1, characterized in that, The granular sludge return unit further includes a granular sludge discharge pipeline connected to the granular sludge storage tank, used to discharge aged granular sludge from the granular sludge storage tank.

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