A high-speed anaerobic reactor DUO-type full-coverage multi-channel three-phase separator

Abstract

The present invention discloses a high-speed anaerobic reactor DUO-type full-coverage multi-channel three-phase separator, which relates to the technical field of anaerobic wastewater treatment. The present invention includes an anaerobic reactor housing and a DUO-type full-coverage multi-channel three-phase separator; the DUO-type full-coverage multi-channel three-phase separator includes a funnel-shaped biogas collection chamber and an intermediate main biogas chamber and two side biogas chambers formed by partitioning its internal space; a first separation channel and a second separation channel are provided at the lower side of the biogas collection chamber. The present invention is an efficient three-phase separation device for wastewater, anaerobic granular sludge, and biogas in an anaerobic reactor suitable for high upflow velocity and high volumetric load. Through the downward flow separation channels designed with a dual-channel structure, the three-phase separation of biogas, granular sludge, and wastewater can be effectively carried out, and at the same time, the ability to retain small granular sludge in the anaerobic reactor can be greatly improved, thereby increasing the total amount of anaerobic granular sludge in the overall anaerobic reactor and ensuring the treatment effect of the anaerobic reactor.

Description

Technical Field

[0001] The present invention belongs to the technical field of anaerobic wastewater treatment, and in particular relates to a DUO-type fully covered multi-channel three-phase separator for a high-speed anaerobic reactor. The separator is mainly suitable for separating biogas, granular sludge and wastewater in a high-speed anaerobic reactor. Compared with the three-phase separators of current conventional anaerobic reactors, the separator can better separate the three and more effectively retain the anaerobic granular sludge in the anaerobic reactor, thereby avoiding the sludge loss phenomenon that occurs in conventional anaerobic three-phase separators. Background Art

[0002] High-speed anaerobic reactors are widely used in industrial wastewater anaerobic treatment projects at home and abroad, mainly including EGSB granular sludge expanded bed anaerobic reactors and IC internal circulation anaerobic reactors. The conventional design height of EGSB anaerobic reactors is 10 to 18 meters, and the conventional design height of IC internal circulation anaerobic reactors is 20 to 30 meters. EGSB anaerobic reactors usually use single-layer three-phase separators, while IC internal circulation anaerobic reactors are high in height. In order to reduce the risk of anaerobic biogas production and the granular sludge in the anaerobic reactor being carried out of the anaerobic reactor, a two-stage three-phase separator is often set up to reduce the risk of sludge loss and increase the volumetric load rate of the anaerobic reactor. At present, there are many domestic projects that use IC internal circulation anaerobic reactors to treat high-concentration organic wastewater, and almost all of them adopt the form of two-stage UASB superposition, and the three-phase separators used are almost all in the form of multi-layer inverted triangle biogas collection modules used in foreign IC internal circulation anaerobic reactors. This type of three-phase separator has the following advantages:

[0003] First, by installing multi-layer inverted triangle-shaped biogas collection modules, the biogas generated during the anaerobic process and rising vertically along the anaerobic reactor can be effectively collected. The biogas, which is then lifted to the biogas degassing tank at the top of the IC anaerobic reactor through the biogas, anaerobic sludge, and wastewater mixed liquid riser, is then lifted to the biogas degassing tank at the top of the IC anaerobic reactor by biogas lift. This reduces the interference of the anaerobic biogas on the second-stage UASB anaerobic reaction process.

[0004] Secondly, the sludge-water mixture after biogas separation in the biogas degassing tank is returned to the water distribution system at the bottom of the IC anaerobic reactor to increase the internal circulation of the anaerobic reactor and enhance the mixing and mass transfer effect of anaerobic granular sludge and wastewater.

[0005] However, from the perspective of many years of practice and engineering application of IC internal circulation anaerobic reactors, the conventional inverted triangle three-phase separator has the following defects:

[0006] First, for wastewater with very good formation of granular sludge, such as food processing wastewater, brewing wastewater, etc., this type of three-phase separator is still a high-speed anaerobic reactor that can be used. However, for some wastewater with slower formation of granular sludge or weaker ability to form large granular anaerobic sludge, such as PTA chemical wastewater, fermentation pharmaceutical wastewater, etc., the IC anaerobic reactor often has the problem of sludge loss that is difficult to avoid;

[0007] Second, in the multi-layer inverted triangle biogas collection module, the space between two adjacent modules is the space through which sludge and wastewater can pass. Since more inverted triangle biogas collection modules are set in the entire cross-section, the upward flow velocity of the biogas, granular sludge and wastewater mixture in the interval area suddenly accelerates, and then suddenly decelerates due to the expansion of the space after passing through this interval. During this process, the turbulent state of the mixture passing through the interval area is very strong, resulting in part of the biogas produced anaerobically not being collected by the inverted triangle biogas module, but rising along the interval of the multi-layer collection module to the upper part of the three-phase separator. This is also the reason why the inverted triangle anaerobic three-phase separator often requires multi-layer design for collection.

[0008] Third, the three-phase separator in the form of an inverted triangle multi-layer biogas collection module used in the IC anaerobic reactor actually only has the function of separating and collecting biogas. Essentially, it is the separation of biogas and the sludge / wastewater mixture, belonging to a primary separation (i.e., two-phase separation), and does not have the three-phase separation function of separating granular sludge and wastewater. The granular sludge completely relies on its own weight to remain in the anaerobic reactor. Therefore, those relatively small-sized and initially formed anaerobic granular sludges often cannot overcome the high upward flow velocity induced by biogas and hydraulics in the IC anaerobic reactor and are washed out of the anaerobic reactor, resulting in the loss of these anaerobic sludges. This is a problem that cannot be overcome by this type of three-phase separator at present. Summary of the Invention

[0009] The present invention provides a high-speed anaerobic reactor DUO-type full-coverage multi-channel three-phase separator, which solves the above problems.

[0010] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0011] The high-speed anaerobic reactor DUO-type full-coverage multi-channel three-phase separator of the present invention includes an anaerobic reactor housing and a DUO-type full-coverage multi-channel three-phase separator supported by a support frame arranged around the inner side wall of the high-speed anaerobic reactor housing;

[0012] The described DUO - type full - coverage multi - channel three - phase separator is supported by an internal frame support plate to form a complete circular three - phase separator that can fill the entire cross - section of the anaerobic reactor shell; the DUO - type full - coverage multi - channel three - phase separator includes a funnel - shaped biogas collection chamber and an intermediate main biogas chamber and two side biogas chambers separated from its internal space; a first separation channel is provided at the lower side of the biogas collection chamber, and second separation channels are symmetrically arranged on the upper side of the biogas collection chamber above the first separation channel, and an anaerobic sludge return gap is provided at the bottom of the biogas collection chamber; biogas collection connecting pipes that connect the biogas collection chamber and the two side biogas chambers are respectively arranged above the inner liquid level in the DUO - type full - coverage multi - channel three - phase separator. After the biogas collection connecting pipes are connected to the intermediate main biogas chamber and then converge into a biogas collection main pipe, the biogas collection main pipe is connected to a biogas collection and discharge pipe with a flange and then extends outside the anaerobic reactor shell.

[0013] Further, both the first separation channel and the second separation channel are downward water flow channels with an inclination of 45 - 60°, which are used to complete the functions of biogas separation and solid - liquid separation of granular sludge and wastewater.

[0014] Further, both the first separation channel and the second separation channel are channels composed of parallel plates. There is a 100 - mm interval between adjacent parallel plates, and each parallel plate is supported by an internal frame support plate to maintain the parallel plate spacing and overall fixation.

[0015] Further, the anaerobic reactor shell adopts a high - speed anaerobic reactor shell with a large height - to - diameter ratio, and the height is 20 - 30 m.

[0016] Further, the DUO - type full - coverage multi - channel three - phase separator is fixed by a support frame, and the distance between its outer wall and the inner wall of the anaerobic reactor shell does not exceed 30 mm.

[0017] The present invention has the following beneficial effects compared with the prior art:

[0018] 1. The DUO - type full - coverage multi - channel three - phase separator of the high - speed anaerobic reactor of the present invention is an efficient three - phase separation device for wastewater, anaerobic granular sludge, and biogas suitable for anaerobic reactors with high up - flow velocity and high volume load.

[0019] 2. The DUO - type full - coverage multi - channel three - phase separator of the high - speed anaerobic reactor of the present invention changes the two - phase separation mode of the existing inverted - triangle - type IC internal - circulation anaerobic reactor that only performs biogas separation. Through the downward - flow separation channels with a dual - channel design, it can effectively perform three - phase separation of biogas, granular sludge, and wastewater, and at the same time can greatly improve the retention ability of small - sized granular sludge in the anaerobic reactor, thereby increasing the total amount of anaerobic granular sludge in the overall anaerobic reactor and ensuring the treatment effect of the anaerobic reactor.

[0020] 3. The DUO-type full-coverage multi-channel three-phase separator of the high-speed anaerobic reactor of the present invention effectively avoids the problems that in the IC internal circulation anaerobic reactor, in the interval area of the inverted triangle multi-layer biogas collection module, during the process where the upward flow velocity of the mixture of biogas, anaerobic granular sludge, and wastewater suddenly increases and then rapidly decreases, due to strong turbulence, some biogas is not collected, and some small granular sludge may be lost due to the sudden increase in the upward flow velocity.

[0021] Of course, it is not necessary for any product implementing the present invention to simultaneously achieve all the above-mentioned advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of a DUO-type full-coverage multi-channel three-phase separator of a high-speed anaerobic reactor of the present invention;

[0024] Figure 2 It is a top view of the structure of the DUO-type full-coverage multi-channel three-phase separator of the present invention;

[0025] Figure 3 is Figure 2 a structural relationship diagram between the internal frame support plate and the parallel plate in

[0026] Figure 4 is Figure 1 a structural relationship diagram between the biogas collection chamber and the middle main biogas chamber in

[0027] Figure 5 It is a schematic structural diagram of the biogas collection mechanism of the present invention;

[0028] Figure 6 It is a structural diagram of a conventional three-phase separator of an existing IC internal circulation anaerobic reactor;

[0029] In the drawings, the list of components represented by each reference numeral is as follows:

[0030] 1 - Anaerobic reactor shell, 2 - Anaerobic granular sludge with large particle size in the anaerobic reactor, 3 - Separation path of anaerobic granular sludge with small particle size in the anaerobic reactor along the separation channels in the DUO-type multi-channel three-phase separator, 4 - Support frame, 5 Anaerobic granular sludge with small particle size in the anaerobic reactor, 6 - DUO-type full-coverage multi-channel three-phase separator, 7 - Inner frame support plate, 8 - Anaerobic sludge falling-back gap, 9 - First separation channel, 10 - Small particle anaerobic sludge in the DUO-type multi-channel three-phase separator, 11 - Biogas bubbles in the DUO-type multi-channel three-phase separator, 12 - Second separation channel, 13 - Biogas collection chamber, 14 - Inner liquid level, 15 - Side biogas chamber, 16 - Biogas collection connecting pipe, 17 - Biogas discharge pipe after collection, 18 - Upward flow state of wastewater after the sludge and wastewater mixture is separated through the sludge-water separation channel, 21 - Upward flow direction of biogas in the biogas collection chamber of the DUO-type multi-channel three-phase separator, 22 - Downward sedimentation direction of large particle anaerobic granular sludge in the biogas collection chamber of the DUO-type multi-channel three-phase separator, 23 - Main biogas collection pipe, 24 - Intermediate main biogas chamber, 25 - Parallel plate. Specific implementation manner

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "circumferential arrangement", "inner side wall", "inside", "interface", "lower side part", "bottom", etc. indicate the orientation or positional relationship, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0033] The existing anaerobic three-phase separator adopts a conventional inverted triangular structure, as Figure 6 shown:

[0034] It is a conventional three-phase separator for an IC internal circulation anaerobic reactor, including an IC anaerobic reactor shell, large-sized anaerobic granular sludge in the anaerobic reactor, an inverted triangle three-phase separator ring support frame for the IC internal circulation anaerobic reactor, an adjacent inverted triangle biogas collection module spacer for the IC anaerobic reactor, an inverted triangle biogas collection module, biogas collected by the inverted triangle biogas collection module, an intermittent release port for pressurized biogas, an intermittent release port for pressurized biogas, a downpipe for the mud-water mixture after biogas degassing (internal circulation pipe), and an inverted umbrella-shaped biogas collection module. Biogas collection box, small-particle anaerobic sludge, biogas, wastewater mixed liquid ascending pipe, cyclone biogas degassing tank, anaerobic reactor biogas discharge pipe, adjacent inverted triangle biogas collection module interval mixed liquid flow pattern, sludge and wastewater after biogas removal in the top cyclone degassing tank in the downcomer flow direction (internal circulation), IC anaerobic reactor adjacent inverted triangle biogas collection module interval sludge, part of the biogas, wastewater ascending flow direction, IC anaerobic reactor shell, IC anaerobic reactor internal sludge, wastewater, biogas ascending flow direction;

[0035] It has the following disadvantages:

[0036] First, this type of three-phase separator is still a suitable high-speed anaerobic reactor for wastewater with very good granular sludge formation, such as food processing wastewater and brewing wastewater. However, for wastewater with slow granular sludge formation or weak large-particle anaerobic granular sludge formation ability, such as PTA chemical wastewater and fermentation pharmaceutical wastewater, IC anaerobic reactors often have difficulty in avoiding sludge loss.

[0037] The second is the multi-layer inverted triangle biogas collection module. The space between two adjacent modules is the space through which sludge and wastewater pass. Since more inverted triangle biogas collection modules are set up in the entire cross section, the rising velocity of the biogas, granular sludge and wastewater mixture in the interval area suddenly accelerates, and then suddenly slows down due to the expansion of the space after passing through the interval. In this process, the turbulent state of the mixed liquid passing through the interval area is very strong, causing some of the anaerobic biogas not to be collected by the inverted triangle biogas modules, but to rise to the upper part of the three-phase separator along the intervals of the multi-layer collection modules. This is why the inverted triangle anaerobic three-phase separator often requires the design of multi-layer collection.

[0038] Thirdly, the three-phase separator of the IC anaerobic reactor in the form of an inverted triangular multi-layer biogas collection module actually only has the functions of separating and collecting biogas. In essence, it is the separation of biogas and the sludge / wastewater mixture, belonging to a primary separation (i.e., two-phase separation), without the three-phase separation function of separating granular sludge and wastewater. The granular sludge remains in the anaerobic reactor entirely by its own weight. Therefore, those small-sized and initially formed anaerobic granular sludges often cannot overcome the high upward flow velocity induced by biogas and hydraulics in the IC anaerobic reactor and are washed out of the anaerobic reactor, resulting in the loss of these anaerobic sludges. This is a problem that cannot be overcome by such three-phase separators at present.

[0039] From the structure and principle of the inverted triangular biogas collection module adopted in the above IC internal circulation anaerobic reactor, the above three deficiencies of this type of three-phase separator adopted in the IC internal circulation anaerobic reactor are relatively easy to understand.

[0040] To solve the deficiencies of the traditional inverted triangular three-phase separator of the anaerobic reactor, the invention discloses a DUO-type full-coverage multi-channel three-phase separator, which can effectively avoid the deficiencies of the traditional anaerobic three-phase separator, increase the total amount of effective granular sludge in the anaerobic reactor, and improve the stability and efficiency of the overall high-speed anaerobic reactor in treating wastewater.

[0041] Please refer to Figures 1-5 As shown, a DUO-type full-coverage multi-channel three-phase separator of a high-speed anaerobic reactor of the present invention includes an anaerobic reactor housing 1 and a DUO-type full-coverage multi-channel three-phase separator 6 supported by a support frame 4 arranged around the inner side wall of the high-speed anaerobic reactor housing 1;

[0042] The DUO full-coverage multi-channel three-phase separator 6 is supported by an internal frame support plate 7 to form a circular three-phase separator that can completely cover the cross-section of the anaerobic reactor shell 1; the DUO full-coverage multi-channel three-phase separator 6 includes two funnel-shaped biogas collection compartments 13, and an intermediate main biogas chamber 24 and two side biogas chambers 15 separated from its internal space; a first separation channel 9 is provided at the lower side of the biogas collection compartment 13, and a second separation channel 12 is symmetrically provided at the upper side of the biogas collection compartment 13 with respect to the first separation channel 9, and an anaerobic sludge return gap 8 is provided at the bottom of the biogas collection compartment 13; biogas collection connecting pipes 16 that connect the biogas collection compartment 13 and the two side biogas chambers 15 are respectively provided above the inner liquid level 14 in the DUO full-coverage multi-channel three-phase separator 6, and the two biogas collection connecting pipes 16 are connected to the intermediate main biogas chamber 24 and then converge into a biogas collection main pipe 23, and then the biogas collection main pipe 23 is connected to a biogas collection and discharge pipe 17 with a flange and extends to the outside of the anaerobic reactor shell 1; the top of each biogas collection compartment 13 is the biogas storage chamber of the collection compartment, and when the biogas pressure reaches the set pressure, the biogas in the collection compartment will be discharged to the homogeneous adjustment tank;

[0043] As shown by the reference numeral 18, it is the upward flow state 18 of the wastewater after the sludge and wastewater mixture is separated by the mud-water separation channel: after the wastewater is separated from the mud, it flows in the vertical direction of the anaerobic reactor;

[0044] As shown by the reference numeral 21, it is the upward flow direction 21 of the biogas in the biogas collection compartment of the DUO multi-channel three-phase separator: the biogas generated by the anaerobic system flows upward in the vertical direction and is collected by the biogas collection compartment at the top of the DUO three-phase separator;

[0045] As shown by the reference numeral 22, it is the downward settling direction 22 of the large-particle anaerobic granular sludge in the biogas collection compartment of the DUO multi-channel three-phase separator: similar to the IC anaerobic reactor, the larger granular anaerobic granular sludge in the anaerobic reactor can move downward completely relying on its own weight and remain in the anaerobic reactor.

[0046] The DUO full-coverage multi-channel three-phase separator 6 refers to a three-phase separator that can effectively separate biogas, granular sludge, and wastewater. By setting a downward water flow channel with a double-channel slope of 45 to 60 degrees in the DUO multi-channel three-phase separator, the biogas rises along the channel wall and converges into the biogas collection compartment. The anaerobic granular sludge and wastewater after the biogas is removed are separated during the downward flow along the inclined channel. The separated sludge falls into the anaerobic reactor along the interval area, and the separated wastewater flows upward. It is an anaerobic three-phase separator that truly realizes the separation of gas, liquid, and solid phases.

[0047] The anaerobic sludge return gap 8, through the degassing effect of the dual-channel and the separation of granular sludge / wastewater, after separation, the anaerobic granular sludge is free from the influence of the biogas microbubbles attached to the surface, its sedimentation performance is enhanced, and it settles to the lower part of the three-phase separator along the sedimentation interval area set in the three-phase separator, and resumes the anaerobic biochemical degradation activity with the organic pollutants in the wastewater.

[0048] The anaerobic reactor housing 1 is located below the DUO-type full-coverage multi-channel three-phase separator 6. There is anaerobic granular sludge 2 with large particle size in the anaerobic reactor. It is anaerobic granular sludge with good granulation and large particle size in the anaerobic reactor. Under normal conditions, the sedimentation rate of this type of anaerobic granular sludge is 50 - 150 m / h, which can completely overcome the upward flow energy caused by hydraulic force and biogas, and remain in the anaerobic reactor;

[0049] As shown by the reference numeral 3 in the attached figure, it is the separation path 3 of the anaerobic granular sludge with small particle size in the anaerobic reactor along the separation channels in the DUO-type multi-channel three-phase separator: A relatively large amount of small granular sludge and a small amount of large granular sludge will undergo the separation process of biogas, granular sludge, and wastewater in the first separation channel 9 and the second separation channel 12 in the DUO-type three-phase separator. The biogas flows upward along the channel wall and converges at the top of the biogas collection chamber 13 of the DUO-type multi-channel three-phase separator. The anaerobic sludge and wastewater after biogas removal are separated during the downward flow along the channel. The separated anaerobic granular sludge settles into the anaerobic reactor more easily due to the absence of biogas disturbance, while the wastewater after separating the anaerobic granular sludge flows upward in the vertical direction;

[0050] As shown by the reference numeral 5 in the attached figure, it is the anaerobic granular sludge 5 with small particle size in the anaerobic reactor: During the process of anaerobic degradation of organic matter, the anaerobic granular sludge will proliferate (new anaerobic microorganisms). The proliferated anaerobic granular sludge is not all granular sludge with large particle size. Often, the large granular sludge is formed by the gradual combination of small granular sludge during the process of degrading organic pollutants. The methanogens in these small granular sludges will generate very small biogas bubbles inside the granular sludge and attach to the surface of the granular sludge, causing these granular sludges with smaller particle sizes to easily accelerate upward under the drive of the small biogas bubbles, resulting in the loss of these small anaerobic granular sludges.

[0051] As shown by the reference numeral 10 in the attached figure, it is the small granular anaerobic sludge 10 in the DUO-type multi-channel three-phase separator: Due to the difficulty of the self-weight of the small anaerobic granular sludge in overcoming the combined action of the surface microbubbles and the hydraulic upward flow velocity in the reactor, it often accumulates in the DUO-type three-phase separator. And when these small granular anaerobic sludges flow through the first and second separation channels, they become easier to settle in the anaerobic reactor due to the removal of biogas, thus avoiding the loss of this type of anaerobic sludge;

[0052] As shown by the reference numeral 11 in the attached figure, it is the biogas bubble 11 inside the DUO-type multi-channel three-phase separator: Except for a small amount of biogas produced by the anaerobic system dissolved in the wastewater, all the biogas will be collected by the biogas collection chamber 13 of the DUO-type three-phase separator. There will be no sudden increase in the local upward flow velocity and turbulent flow phenomenon that occurs in the inverted triangular IC internal circulation anaerobic reactor. Therefore, the disturbance and interference of biogas to the upper anaerobic reaction area can be minimized to ensure the stability of the anaerobic degradation process in the upper anaerobic reaction area;

[0053] The three phases in the three-phase separation refer to: gas, liquid, and solid, that is, the separation of the biogas produced by the anaerobic process, the treated wastewater, and the anaerobic granular sludge. The separation principle is as follows: The biogas will flow upward in the wastewater. The anaerobic granular sludge has the power to rise under the action of the biogas and the hydraulic upflow. However, due to the weight of the granular sludge itself, it will resist the upward power, resulting in a "swollen" state in the reactor. If the small granular sludge cannot overcome the power of the biogas and the hydraulic upflow, it will flow upward. At this time, by setting a double-channel inclined downward fluid channel, the large bubble biogas separated from the wastewater will rise to the biogas collection chamber and will not flow along the downward channel. In this way, the remaining wastewater and the granular sludge (especially the small granular sludge) wrapped by some biogas microbubbles will flow along the inclined downward channel. During the flow process, the small biogas bubbles on the granular sludge will detach from the surface of the granular sludge and become free biogas bubbles, and flow upward along the inclined downward channel wall, achieving the purpose of detaching the micro-bio-gas bubbles wrapped on the granular sludge. When most of the biogas microbubbles wrapped by the granular sludge are removed, the relative specific gravity of the granular sludge will increase, and it can overcome the action of the hydraulic upflow and move downward to settle in the anaerobic reactor, thus achieving the purpose of retaining the anaerobic granular sludge. The wastewater still flows upward through the inclined downward channel under the action of the hydraulic upflow.

[0054] The flow dynamics of granular sludge inside the DUO-type full-coverage multi-channel three-phase separator of a high-speed anaerobic reactor: Granular sludge is introduced into the anaerobic reactor during biological startup by purchasing anaerobic granular sludge externally and pumping it into the reactor using a screw pump. If there is no wastewater entering and only clear water, the granular sludge will sink to the bottom of the reactor due to its specific gravity being higher than that of water. When sewage enters the tank, the sewage will rise along the tank body. Usually, the upward flow velocity of the influent flow rate across the tank cross-section is 4 - 8 m / h. This hydraulic upflow is one of the driving forces for the upward movement of granular sludge. Another driving force is that anaerobic granular sludge is actually an aggregate of anaerobic microorganisms. Methanogenic bacteria among them will degrade organic pollutants in the wastewater and produce methane gas, carbon dioxide, and water. Biogas composed of methane and carbon dioxide that is separated from the anaerobic granular sludge and free in the wastewater has a density lower than that of water, which will push the granular sludge upward. This is the second driving force. Additionally, some micro-biogas bubbles that have not yet detached from the granular sludge will wrap around the granular sludge, reducing the overall specific gravity of the anaerobic granular sludge. The micro-bubbles have the driving force to make the granular sludge rise. This is the third driving force.

[0055] Among them, both the first separation channel 9 and the second separation channel 12 are downward water flow channels with an inclination of 45 - 60°, which are used to complete the functions of biogas separation and solid-liquid separation of granular sludge and wastewater; the biogas rises along the channel wall and converges into the biogas collection chamber 13. The anaerobic granular sludge and wastewater after biogas removal are separated during the downward flow along the inclined channel, and the separated sludge falls into the bottom of the high-speed anaerobic reactor shell 1 along the spacer area.

[0056] Among them, both the first separation channel 9 and the second separation channel 12 are channels composed of parallel plates 25. There is a 100-mm gap between adjacent parallel plates 25, and each pair of parallel plates 25 is supported by an internal frame support plate 7 to maintain the parallel plate spacing and overall fixation.

[0057] Among them, the anaerobic reactor shell 1 adopts a high-speed anaerobic reactor shell with a large height-to-diameter ratio, and the conventional height is 20 - 30 m.

[0058] Among them, the DUO-type full-coverage multi-channel three-phase separator 6 is fixed by a support frame 4, and the distance between its outer wall and the inner wall of the anaerobic reactor shell 1 does not exceed 30 mm.

[0059] Beneficial effects:

[0060] 1. The DUO-type full-coverage multi-channel three-phase separator of the high-speed anaerobic reactor of the present invention is an efficient three-phase separation device for wastewater, anaerobic granular sludge, and biogas applicable to anaerobic reactors with high upward flow velocities and high volumetric loads.

[0061] 2. The DUO-type full-coverage multi-channel three-phase separator of the high-speed anaerobic reactor of the present invention changes the two-phase separation mode of the existing inverted triangular IC internal circulation anaerobic reactor that only performs biogas separation. Through the downward flow separation channel designed with a double channel, it can effectively perform the three-phase separation of biogas, granular sludge, and wastewater, and at the same time can greatly improve the ability of small granular sludge to be retained in the anaerobic reactor, thereby increasing the total amount of anaerobic granular sludge in the overall anaerobic reactor and ensuring the treatment effect of the anaerobic reactor.

[0062] 3. The DUO-type full-coverage multi-channel three-phase separator of the high-speed anaerobic reactor of the present invention effectively avoids the problems that in the process of the sudden increase and then rapid decrease of the upward flow velocity of the biogas, anaerobic granular sludge, and wastewater mixture generated in the interval area of the inverted triangular multi-layer biogas collection module of the IC internal circulation anaerobic reactor, some biogas is not collected due to strong turbulence, and some small granular sludge may cause sludge loss due to the sudden increase in the upward flow velocity.

[0063] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the relevant technical fields can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A high-speed anaerobic reactor DUO-type full-coverage multi-channel three-phase separator, characterized in that, It includes an anaerobic reactor housing (1) and a DUO-type full-coverage multi-channel three-phase separator (6) supported by a support frame (4) arranged around the inner sidewall of the high-speed anaerobic reactor housing (1). The DUO-type full-coverage multi-channel three-phase separator (6) is supported by an internal frame support plate (7) to form a complete circular three-phase separator that can cover the entire cross-section of the anaerobic reactor housing (1). The DUO-type full-coverage multi-channel three-phase separator (6) includes a funnel-shaped biogas collection chamber (13), a middle main biogas chamber (24) and two side biogas chambers (15) separated from its internal space. A first separation channel (9) is provided at the lower side of the biogas collection chamber (13), and second separation channels (12) are symmetrically arranged above the first separation channel (9) on the biogas collection chamber (13). An anaerobic sludge return gap (8) is provided at the bottom of the biogas collection chamber (13). Biogas collection connecting pipes (16) communicating with the biogas collection chamber (13) and the two side biogas chambers (15) are respectively provided above the inner liquid level (14) in the DUO-type full-coverage multi-channel three-phase separator (6). The biogas collection connecting pipes (16) are connected to the middle main biogas chamber (24) and then converge into a biogas collection main pipe (23). Then, the biogas collection main pipe (23) is connected to a biogas collection and discharge pipe (17) with a flange and extends to the outside of the anaerobic reactor housing (1). Both the first separation channel (9) and the second separation channel (12) are downward water flow channels with an inclination of 45-60°, which are used to complete the functions of biogas separation and solid-liquid separation of granular sludge and wastewater. Both the first separation channel (9) and the second separation channel (12) are channels composed of parallel plates (25). A 100-mm interval is provided between adjacent parallel plates (25). The parallel plates (25) are supported by the internal frame support plate (7) to maintain the parallel plate spacing and overall fixation. The DUO-type full-coverage multi-channel three-phase separator (6) is fixed by the support frame (4), and the distance between its outer sidewall and the inner wall of the anaerobic reactor housing (1) does not exceed 30 mm.

2. The high-speed anaerobic reactor DUO type full-coverage multi-channel three-phase separator according to claim 1, characterized in that, The anaerobic reactor housing (1) adopts a high-speed anaerobic reactor housing with a large height-to-diameter ratio, and the height is 20-30 m.

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