An external circulation anaerobic reactor system with large aspect ratio of granular sludge

Abstract

The present invention discloses an external circulation large height-diameter ratio granular sludge anaerobic reactor system, and relates to the technical field of wastewater anaerobic treatment. The present invention includes a homogenization regulating tank, an anaerobic reactor, an anaerobic reactor system effluent distribution pipe, a chemical dosing pipeline, a jet mixing system, a first-level DUO type full-coverage multi-channel three-phase separator, a second-level DUO type full-coverage multi-channel three-phase separator, an anaerobic effluent collection pipe, a "pot-shaped" pulse water distribution system, a two-way pulse feeding system, a first anaerobic reaction zone, a second anaerobic reaction zone, a third anaerobic reaction zone, and a fourth anaerobic reaction zone. The present invention avoids the problem of water distribution system blockage that occurs when treating papermaking wastewater containing high-concentration calcium ions, and at the same time can avoid the generation of strong vortexes inside the "pot-shaped" water distribution system to prevent the water distribution slit from being blocked; compared with the comparative analysis of the IC internal circulation anaerobic reactor, it has a more stable and efficient treatment effect and has broad application prospects.

Description

Technical Field

[0001] The present invention belongs to the technical field of anaerobic treatment of wastewater, and in particular relates to an external circulation large aspect ratio granular sludge anaerobic reactor system, which is widely applicable to the field of anaerobic treatment of high-concentration organic wastewater that can form good anaerobic granular sludge, such as food processing wastewater, brewing wastewater, pulp and paper production wastewater, citric acid production wastewater, biological fermentation pharmaceutical wastewater, certain chemical wastewater, etc. Background Art

[0002] Anaerobic treatment processes are widely used in industrial wastewater. The anaerobic processes on the market are mainly divided into low-speed anaerobic reactors (low volumetric loading rate) and high-speed anaerobic reactors (high volumetric loading rate). Among them, low-speed anaerobic reactors mainly include UASB (upflow anaerobic sludge blanket), CSTR (continuous stirred anaerobic reactor), ABR (baffled anaerobic reactor), etc. High-speed anaerobic reactors mainly include EGSB (granular sludge expanded bed), IC (internal circulation anaerobic reactor) and similar derivative anaerobic reactor types. From the application and research of domestic anaerobic processes, IC internal circulation anaerobic reactor is the most studied and applied high-speed anaerobic reactor by domestic environmental protection enterprises and scientific research institutions. The IC anaerobic reactor technology originated from an environmental protection technology company in the Netherlands. It is essentially two superimposed UASB anaerobic reactors. The biggest feature of this anaerobic reactor is its high volumetric loading rate and can be developed to high altitude to achieve the purpose of saving land. This also meets the needs of some European countries to save land for sewage treatment plants due to tight land. Since the IC anaerobic reactor technology was introduced into the Chinese market 20 years ago, it has attracted great interest from domestic environmental protection companies and scientific research institutions. Currently, more than 95% of domestic anaerobic technology suppliers can provide IC internal circulation anaerobic reactor technology.

[0003] The main components of the IC internal circulation anaerobic reactor include: an inverted umbrella-shaped narrow slit water distribution system, a first-layer inverted triangle-type three-phase separator, a second-layer inverted triangle-type three-phase separator, a mixed liquid / biogas riser, a top cyclone biogas degassing tank, a top waste gas collection cover, and an effluent circulation distribution riser. However, the IC internal circulation anaerobic reactor is, after all, a vertical superposition of two UASBs. Although it has very good performance in terms of high volumetric load rate and efficient mixing effect caused by internal circulation at the bottom, its performance in retaining anaerobic sludge from loss is unsatisfactory, especially when the particle size of anaerobic granular sludge is small due to the characteristics of the wastewater, the loss of anaerobic sludge is often more serious. The main problems existing in the application process of IC internal circulation anaerobic reactors over the years are summarized as follows:

[0004] 1. The papermaking industry is the most widely used IC internal circulation anaerobic reactor. Due to the high calcium ion concentration in the wastewater caused by water conservation in the papermaking industry in recent years, the granular sludge is calcified, and the internal riser and descending pipes of the anaerobic reactor and the inverted umbrella-shaped narrow slit water distribution system are seriously scaled and blocked, which eventually leads to a decrease in the efficiency of the IC anaerobic reactor. This has become the biggest problem in the anaerobic treatment of wastewater in the industry;

[0005] 2. The rising velocity of liquid and biogas in the IC internal circulation anaerobic reactor is too high (up to 20m / h or more). The granular sludge in the reactor is completely retained in the anaerobic reactor by its own weight. The anaerobic granular sludge with smaller particles at the beginning is often flushed out of the anaerobic reactor. When the rate of generating large-particle anaerobic granular sludge is lower than the loss rate of small-particle anaerobic granular sludge during the anaerobic treatment of wastewater, the total amount of anaerobic granular sludge in the IC internal circulation anaerobic reactor will be reduced, resulting in a decrease in the treatment efficiency of the IC anaerobic internal circulation anaerobic reactor.

[0006] 3. The top of the IC internal circulation anaerobic reactor conventionally adopts an overflow weir to collect the effluent. When the horizontality of the effluent weir plate is deviated or the weir plate is loosened during long-term operation, it will cause uneven effluent.

[0007] 4. Conventional IC internal circulation anaerobic reactor adopts normal pressure mode, the top is connected to the atmosphere, and the waste gas emitted from the anaerobic effluent is collected through the top cover and needs to be treated;

[0008] 5. The IC internal circulation anaerobic reactor lacks a biogas storage and pressure stabilizing device system and must be equipped with a biogas pressure stabilizing cabinet, which increases the risk points for the safe use of biogas.

[0009] Mainly aimed at the problems that have occurred in the operation of IC high-speed anaerobic reactors for many years, the present invention provides a new type of external circulation high-speed anaerobic reactor (ECSBDUO, DUO type External Circulating Sludge Bed Reactor) system and device (hereinafter referred to as ECSBDUO anaerobic reactor) while retaining the high aspect ratio and high volumetric load rate of IC anaerobic reactors. The new anaerobic reactor system is composed of two tanks, one is a homogenization regulating tank for adjusting the water quality of the influent and utilizing the alkalinity of the anaerobic return water, and the other is the core ECSB DUO anaerobic reactor. Compared with the IC internal circulation anaerobic reactor, the new ECSBDUO anaerobic reactor has the following characteristics: (1) It retains the characteristics of large height-to-diameter ratio and high volumetric load rate of the IC internal circulation anaerobic reactor; (2) It adopts a new "pot-shaped" pulse water distribution system to replace the IC inverted umbrella-shaped narrow slit water distribution system; (3) It adopts a new DUO type multi-channel three-phase separator to replace the inverted triangle biogas collection module; (4) It adopts a submerged effluent collection pipe to replace the sawtooth overflow weir with top overflow; (5) It adopts a completely closed anaerobic reactor design. Summary of the invention

[0010] The present invention provides an external circulation large aspect ratio granular sludge anaerobic reactor system, which solves the above problems.

[0011] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0012] The invention discloses an external circulation large aspect ratio granular sludge anaerobic reactor system, comprising a homogenizing regulating tank, an anaerobic reactor, an anaerobic reactor system effluent distribution pipe installed on the upper side of the homogenizing regulating tank, a chemical dosing pipe installed on the side of the homogenizing regulating tank, a jet mixing system installed on the lower side of the homogenizing regulating tank, a first-level DUO type full-coverage multi-channel three-phase separator installed in the anaerobic reactor, a second-level DUO type full-coverage multi-channel three-phase separator arranged above the first-level DUO type full-coverage multi-channel three-phase separator, an anaerobic effluent collection pipe installed above the second-level DUO type full-coverage multi-channel three-phase separator and located below the liquid level in the anaerobic reactor, a "pot-shaped" pulse water distribution system installed at the bottom of the anaerobic reactor, and a dual-path pulse feeding system connected between the "pot-shaped" pulse water distribution system and the bottom of the homogenizing regulating tank; the first-level DUO type full-coverage multi-channel three-phase separator and the second-level DUO type full-coverage multi-channel three-phase separator have the same structure;

[0013] The top of the homogenizing and regulating tank is provided with a biogas discharge and utilization outlet which is connected to the upper biogas chamber of the homogenizing and regulating tank at the top of the homogenizing and regulating tank;

[0014] The top of the anaerobic reactor is located above the liquid level in the anaerobic reactor and between the top wall of the anaerobic reactor to form a biogas chamber at the top of the anaerobic reactor. The biogas chamber at the top of the anaerobic reactor is connected to the biogas chamber at the top of the homogenizing regulating tank through a first connecting pipe; the anaerobic effluent collecting pipe is connected to the anaerobic reactor system effluent distribution pipe through an anaerobic effluent delivery pipe arranged above the liquid level of the homogenizing regulating tank; the first-level DUO type full-coverage multi-channel three-phase separator is connected to the homogenizing regulating tank through a first-level DUO type three-phase separator biogas collection delivery pipe; the top of the second-level DUO type full-coverage multi-channel three-phase separator is connected to the homogenizing regulating tank through a second-level DUO type three-phase separator biogas collection delivery pipe; the lower side of the homogenizing regulating tank is provided with a treated wastewater inlet pipe;

[0015] The area within the anaerobic reactor located in the "pot-shaped" pulse water distribution system forms a first anaerobic reaction zone, the area between the "pot-shaped" pulse water distribution system and the first-level DUO type full-coverage multi-channel three-phase separator forms a second anaerobic reaction zone, the area between the first-level DUO type full-coverage multi-channel three-phase separator and the second-level DUO type full-coverage multi-channel three-phase separator forms a third anaerobic reaction zone, and the area between the second-level DUO type full-coverage multi-channel three-phase separator and the anaerobic effluent collection pipe forms a fourth anaerobic reaction zone.

[0016] Furthermore, the jet mixing system includes a jet mixer installed on the inner wall of a homogenizing adjustment tank, a jet mixer feed pump, an outlet pipe of the homogenizing adjustment tank jet mixing system connected between the homogenizing adjustment tank and the jet mixer feed pump, and a jet mixing system circulation reflux pipe connected to the jet mixer feed pump and the jet mixer and arranged outside the homogenizing adjustment tank.

[0017] Furthermore, a pH sensor, a TT temperature sensor, and a FS flow switch are installed on the circulation reflux pipeline of the jet mixing system.

[0018] Furthermore, the anaerobic reactor system outlet water distribution pipe includes an anaerobic outlet water / circulating return water distribution pipe vertically arranged in the homogenization adjustment tank, an anaerobic outlet water pipe connected to the lower part of the anaerobic outlet water / circulating return water distribution pipe, an outlet water distribution riser connected to the outlet end of the anaerobic outlet water pipe and vertically arranged, a waste gas discharge port arranged at the top of the outlet water distribution riser, and an anaerobic system outlet arranged on the upper side of the outlet water distribution riser.

[0019] Furthermore, the "pot-shaped" pulse water distribution system includes a pot-shaped sludge hopper installed at the bottom of the anaerobic reactor and supported and fixed by a vertically arranged side wall support pipe, and a plurality of water distributors arranged in parallel tangential directions from top to bottom are arranged around the inner wall of the pot-shaped sludge hopper;

[0020] The water distributor includes a water distribution pipe arranged on the inner wall of the pot-shaped sludge hopper in a parallel tangent direction from top to bottom, water distribution slits evenly distributed on the side of the water distribution pipe and opening on the same side, and a connecting pipe with a flange that passes through the inner wall of the pot-shaped sludge hopper and is connected to the water distribution pipe; the opening directions of the water distribution slits on adjacent water distribution pipes are staggered in a clockwise direction and a counterclockwise direction, and the ends of the connecting pipes are connected to water distribution connecting pipes.

[0021] Further, the dual-path pulse feeding system comprises a variable frequency anaerobic reactor feeding pump connected to the lower side of the homogenizing regulating tank, an anaerobic reactor feeding main pipeline connected to the variable frequency anaerobic reactor feeding pump, a water distribution pipeline with two flow directions connected to the discharge port of the anaerobic reactor feeding main pipeline, a counterclockwise water inlet branch pipe connected to one flow direction of the water distribution pipeline, and a clockwise water inlet branch pipe connected to the other flow direction of the water distribution pipeline; the end of the counterclockwise water inlet branch pipe is connected to a counterclockwise water distribution branch pipe with the same number of water distribution slits opening in the counterclockwise direction; the end of the clockwise water inlet branch pipe is connected to a clockwise water distribution branch pipe with the same number of water distribution slits opening in the clockwise direction;

[0022] The counterclockwise water distribution branch pipe is connected to the water distribution connecting pipe connected to the water distribution slit opening in the counterclockwise direction, and the clockwise water inlet branch pipe is connected to the water distribution connecting pipe connected to the water distribution slit opening in the clockwise direction; a pulse water distribution system flow control pipe is connected between the counterclockwise water inlet branch pipe and the clockwise water inlet branch pipe.

[0023] Furthermore, a first automatic control pneumatic butterfly valve is installed on the clockwise water inlet branch pipe, a second automatic control pneumatic butterfly valve is installed on the counterclockwise water inlet branch pipe, a manual butterfly valve is installed on the flow control pipeline of the pulse water distribution system; and a flow meter is installed on the anaerobic reactor feed main pipeline.

[0024] Furthermore, the first-stage DUO type fully covered multi-channel three-phase separator is supported by a support frame on the inner side wall of the high-speed anaerobic reactor shell; the first-stage DUO type fully covered multi-channel three-phase separator is supported by an internal frame support plate to form a circular three-phase separator that can cover the entire cross-section of the anaerobic reactor; the first-stage DUO type fully covered multi-channel three-phase separator includes a bucket-shaped biogas collection cabin and an intermediate main biogas chamber and two side biogas chambers separated by its internal space; a first separation channel is arranged on the lower side of the biogas collection cabin, and a second separation channel is symmetrically arranged on the upper side of the first separation channel of the biogas collection cabin, and an anaerobic sludge falling gap is arranged at the bottom of the biogas collection cabin; biogas collecting connecting pipes connecting the biogas collection cabin and the side biogas chambers are respectively arranged above the internal liquid surface in the DUO type fully covered multi-channel three-phase separator, and the biogas collecting connecting pipes are connected to the intermediate main biogas chamber and then collected in the biogas collecting main pipe, and then connected to the first-stage DUO type three-phase separator collecting biogas conveying pipe with a flange to enter the interior of the homogenization regulating tank.

[0025] Furthermore, the first separation channel and the second separation channel are both downward water flow channels with a slope of 45 to 60 degrees, which are used to complete the functions of biogas separation and solid-liquid separation of granular sludge and wastewater; the first separation channel and the second separation channel are both channels composed of parallel plates, and a spacing of 100 mm is set between adjacent parallel plates. The parallel plates are supported by internal frame support plates to maintain the spacing between the parallel plates and the overall fixation.

[0026] Furthermore, the upper part of the anaerobic effluent collection pipe is evenly and laterally provided with openings, and the openings are located 200 mm below the liquid level in the anaerobic reactor.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The external circulation large aspect ratio granular sludge anaerobic reactor system of the present invention is a new type of high-speed anaerobic reactor. On the basis of maintaining the high rising flow rate and high volumetric load rate of the high-speed anaerobic reactor, the commonly used IC internal circulation anaerobic reactor is innovatively improved in terms of water distribution mode, three-phase separator separation mode and effluent collection mode, including the following beneficial effects:

[0029] 1. The present invention adopts a new type of "pot-shaped" pulse water distribution system, which not only avoids the problem of water distribution system blockage in the treatment of papermaking wastewater containing high concentrations of calcium ions, but also avoids the generation of strong vortexes inside the "pot-shaped" water distribution system by setting up a dual-path "pulse" feeding system with different flow rates and interval switching, thereby increasing the "turbulence" intensity of the mixing of granular sludge and wastewater in the "pot". The dual-path pulse feeding system can enhance the material mixing (granular sludge and wastewater) intensity and mass transfer intensity in the "pot-shaped" water distribution system, and improve the degradation effect of wastewater in this area. The slit water distributor set in the "pot" can be regularly cleaned with citric acid or oxalic acid to prevent clogging of the water distribution slit. The bottom of the "pot-shaped" water distribution system can be convenient for discharging and injecting anaerobic granular sludge (such as granular sludge that has failed calcification);

[0030] 2. The three-phase separator of the present invention is the most core component of the anaerobic reactor. Whether it can effectively separate granular sludge, biogas and wastewater is the most important evaluation indicator for measuring the three-phase separation. The new DUO type multi-channel three-phase separator has the functions of separating biogas from granular sludge / wastewater mixture and separating granular sludge from wastewater. Such a two-stage separation mode can greatly improve the retention capacity of anaerobic granular sludge in the anaerobic reactor, ensuring that small particles of anaerobic granular sludge will not be flushed out of the anaerobic reactor under the action of the hydraulic pressure of the IC internal circulation anaerobic reactor and the rise of biogas. This is the biggest advantage of the new anaerobic reactor. At the same time, since the biogas collected by the first and second stage DUO type multi-channel three-phase separators is transported to the homogenization and conditioning tank instead of rising along the anaerobic reactor, the stability of the anaerobic reaction in the third and fourth anaerobic reaction zones is guaranteed, and the risk of anaerobic granular sludge being flushed out of the anaerobic reactor is reduced;

[0031] 3. The present invention adopts a submerged effluent collection pipe to replace the effluent mode of the conventional anaerobic reactor using a sawtooth overflow weir plate, which can greatly improve the uniformity and stability of the effluent;

[0032] 4. The novel anaerobic reactor system of the present invention is a completely closed anaerobic treatment system. The top of the anaerobic system is a biogas storage space, which does not require the biogas pressure regulator cabinet required for the IC internal circulation anaerobic reactor, thereby reducing the risk of biogas treatment. At the same time, the novel anaerobic reactor system does not have waste gas that needs to be treated at the top of the IC anaerobic reactor, which simplifies the design of the anaerobic reactor;

[0033] 5. The novel anaerobic reactor of the present invention does not have an internal mixed liquid riser and downcomer similar to the IC anaerobic reactor, but only has a biogas collection and delivery pipe, which can effectively avoid the anaerobic reactor failure problem caused by blockage of the riser and downcomer in the process of treating papermaking wastewater containing high concentration of calcium ions in the IC internal circulation anaerobic reactor;

[0034] 6. Although the novel anaerobic reactor of the present invention does not have the enhanced mixing and mass transfer effect brought by the internal circulation of the IC internal circulation anaerobic reactor, the "pot-shaped" pulse water distribution system can still fully meet the mixing and mass transfer intensity requirements required by the anaerobic reaction process. It will not have any impact on the performance of the anaerobic reactor. Compared with the comparative analysis of the IC internal circulation anaerobic reactor, the novel anaerobic reactor system and device have a more stable and efficient treatment effect and have broad application prospects.

[0035] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0037] Figure 1 It is a structural schematic diagram of an external circulation large aspect ratio granular sludge anaerobic reactor system of the present invention;

[0038] Figure 2 for Figure 1 Schematic diagram of the structure of the jet mixing system;

[0039] Figure 3 for Figure 1 Schematic diagram of the structure of the effluent distribution pipe of the anaerobic reactor system;

[0040] Figure 4 for Figure 1 The structural diagram of the dual-path pulse feeding system;

[0041] Figure 5 for Figure 1 The structural diagram of the "pot-shaped" pulse water distribution system;

[0042] Figure 6 for Figure 5 A top view of the structure;

[0043] Figure 7 for Figure 5 Schematic diagram of the structure of the middle water distributor;

[0044] Figure 8 for Figure 7 Middle AA section view;

[0045] Fig. 9 for Figure 1 Installation structure diagram of the middle-level DUO type full-coverage multi-channel three-phase separator and anaerobic reactor;

[0046] Fig.10 for Fig. 9 Structural relationship diagram of the middle biogas collection cabin and the middle main biogas chamber;

[0047] Fig.11 It is a top view of the structure of a one-stage DUO type full-coverage multi-channel three-phase separator of the present invention;

[0048] Fig.12 for Fig.11 Structural relationship diagram between the middle internal frame support plate and the parallel plate;

[0049] Fig.13 It is a simplified structural diagram of the biogas collection mechanism of the present invention;

[0050] Fig.14 It is a schematic diagram of the structure of the anaerobic effluent collection pipe;

[0051] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0052] 1-homogenizing regulating tank, 2-treated wastewater inlet pipeline, 3-jet mixing system, 4-chemical dosing pipeline, 6-liquid level of homogenizing regulating tank, 7-biogas chamber on the upper part of homogenizing regulating tank, 8-biogas emission and utilization outlet, 9-biogas chamber on the top of anaerobic reactor, 10-liquid level in anaerobic reactor, 11-anaerobic effluent collection pipe, 111-opening, 12-fourth anaerobic reaction zone, 13-secondary DUO type full-coverage multi-channel three-phase separator, 14-third anaerobic reaction zone, 15-first-level DUO type full-coverage multi-channel three-phase separator, 16-second anaerobic reaction zone, 17-first anaerobic reaction zone, 18-"pot-shaped" pulse water distribution system, 19-anaerobic reactor, 20-dual-channel pulse feeding system, 21-first-level DUO type three-phase separator 2-separator collection biogas delivery pipe, 22-secondary DUO type three-phase separator collection biogas delivery pipe, 23-anaerobic effluent delivery pipe, 24-first connecting pipe, 25-anaerobic reactor system effluent distribution pipe, 26-biogas pressure sensor, 27-conductivity foam detector, 31-jet mixing system circulation return pipeline, 32-jet mixer feed pump, 33-homogeneous adjustment tank jet mixing system outlet pipe, 35-jet mixer, 36-pH sensor, 37-TT temperature sensor, 38-FS flow switch, 41-effluent distribution riser, 42-anaerobic system outlet, 43-waste gas discharge port, 44-anaerobic effluent / circulation return water distribution pipe, 46-anaerobic effluent pipe, 701-clockwise water distribution branch pipe, 702-clockwise water distribution branch pipe Clockwise water inlet branch, 703-first automatic control pneumatic butterfly valve, 704-water distribution pipeline, 705-anaerobic reactor feed main pipeline, 706-frequency conversion anaerobic reactor feed pump, 707-flow meter, 708-second automatic control pneumatic butterfly valve, 709-counterclockwise water inlet branch, 710-pulse water distribution system flow control pipeline, 711-manual butterfly valve, 712-counterclockwise water distribution branch, 202-water distribution connecting pipe, 203-connecting pipe, 204-water distribution pipe, 205-side wall support pipe, 206-water distribution slit, 207-pot-shaped sludge bucket, 211-clockwise water flow direction induced by slit water distributor, 213-counterclockwise water flow direction induced by slit water distributor, 214-cavity structure, 54-support frame, 57-inner The frame support plate, 58-anaerobic sludge falling gap, 59-first separation channel, 512-first separation channel, 513-biogas collection chamber, 514-internal liquid surface, 515-biogas chamber, 516-biogas collection connecting pipe, 523-biogas collection main pipe, 524-middle main biogas chamber, 28-counterclockwise water flow direction induced by the slit water distributor, 29-clockwise water flow direction induced by the slit water distributor, 84-upward flow direction of biogas in the biogas collection chamber of the DUO multi-channel three-phase separator, 83-downward sedimentation direction of large-particle anaerobic granular sludge in the biogas collection chamber of the DUO multi-channel three-phase separator, 81-the path of small-particle anaerobic granular sludge in the anaerobic reactor being separated along the separation channel in the DUO multi-channel three-phase separator,82- After the sludge and wastewater mixture is separated through the mud-water separation channel, the wastewater rises. DETAILED DESCRIPTION

[0053] 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. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] In the description of the present invention, it is necessary to understand that the terms "upper side", "lower side", "above", "below", "inner wall", "bottom" and the like indicate 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 therefore cannot be understood as limiting the present invention.

[0055] See also Figure 1-14 As shown, an external circulation large aspect ratio granular sludge anaerobic reactor system of the present invention comprises a homogenizing regulating tank 1, an anaerobic reactor 19, an anaerobic reactor system outlet water distribution pipe 25 installed on the upper side of the homogenizing regulating tank 1, a chemical dosing pipe 4 installed on the side of the homogenizing regulating tank 1, a jet mixing system 3 installed on the lower side of the homogenizing regulating tank 1, a first-stage DUO type full-coverage multi-channel three-phase separator 15 installed in the anaerobic reactor 19, and a second-stage D arranged above the first-stage DUO type full-coverage multi-channel three-phase separator 15. UO type full coverage multi-channel three-phase separator 13, anaerobic effluent collection pipe 11 installed above the second-stage DUO type full coverage multi-channel three-phase separator 13 and below the liquid level 10 in the anaerobic reactor, "pot-shaped" pulse water distribution system 18 installed at the bottom of the anaerobic reactor 19, and dual-path pulse feeding system 20 connected between the "pot-shaped" pulse water distribution system 18 and the bottom of the homogenization adjustment tank 1; the first-stage DUO type full coverage multi-channel three-phase separator 15 has the same structure as the second-stage DUO type full coverage multi-channel three-phase separator 13;

[0056] "Pot-shaped" pulse water distribution system18: In many years of engineering practice, the inverted umbrella-shaped narrow slit water distribution system of the original IC internal circulation anaerobic reactor is prone to blockage in many cases, especially when treating papermaking wastewater containing high concentrations of calcium ions. The original three-phase separator is very easy to calcify and clog. To address this phenomenon, the new ECSB DUO anaerobic reactor adopts a new "pot-shaped" pulse water distribution system.

[0057] Chemical dosing pipeline 4: According to the different characteristics of wastewater quality, a number of different chemicals need to be added. All the chemicals that need to be added are added from the wall of the homogenization adjustment tank, and are quickly mixed and homogenized with the raw wastewater and the anaerobic effluent circulating dilution water;

[0058] The top of the homogenizing and regulating tank 1 is provided with a biogas discharge and utilization outlet 8 which is connected to the upper biogas chamber 7 of the homogenizing and regulating tank 1 at the top of the homogenizing and regulating tank 1, for discharging or utilizing the biogas generated by the ECSB DUO anaerobic reactor system;

[0059] Anaerobic reactor system effluent distribution pipe 25: used to distribute the treated effluent equivalent to the influent volume and the internal circulating water. The effluent is discharged through the effluent pipe and enters the subsequent treatment system. The circulating dilution water, anaerobic influent and chemicals are quickly mixed and homogenized by the jet mixer.

[0060] Homogenizing and regulating tank 1: Anaerobic microorganisms (including acid-producing bacteria, hydrogen-producing and acetogenic bacteria, methanogenic bacteria, etc.) in the wastewater anaerobic treatment process have very high requirements for the external environment, such as the optimal pH of 6.8-7.3 and the optimal temperature of 35-37°C. At the same time, anaerobic microorganisms need to maintain active N, P nutrients and other macro- and micro-elements. To maintain these conditions, steam (or cooling) and chemicals need to be added. In the homogenizing and regulating tank, these chemicals, together with the anaerobic influent to be treated and the dilution water returned from the EGSB DUO anaerobic reactor, can be quickly mixed and uniformed through the action of the fast jet mixer in the homogenizing and regulating tank, providing the influent with relatively constant water quality and water volume for the ECSB DUO anaerobic reactor system, which is an important guarantee for the stable operation of the anaerobic reactor.

[0061] The top of the anaerobic reactor 19 is located above the liquid level 10 in the anaerobic reactor and forms an anaerobic reactor top biogas chamber 9 between the top wall of the anaerobic reactor 19. The top biogas chamber 9 of the anaerobic reactor is connected to the upper biogas chamber 7 of the homogenizing regulating tank through a first connecting pipe 24; the anaerobic effluent collecting pipe 11 and the anaerobic reactor system effluent distribution pipe 25 are connected through an anaerobic effluent delivery pipe 23 arranged above the liquid level 6 of the homogenizing regulating tank; the first-level DUO type full-coverage multi-channel three-phase separator 15 and the homogenizing regulating tank 1 are connected through the first-level DUO type three-phase separator collection biogas delivery pipe 21; the top of the second-level DUO type full-coverage multi-channel three-phase separator 13 and the homogenizing regulating tank 1 are connected through the second-level DUO type three-phase separator collection biogas delivery pipe 22; the lower side of the homogenizing regulating tank 1 is provided with a treated wastewater inlet pipe 2; the top of the anaerobic reactor top biogas chamber 9 The space above the liquid surface is the biogas storage space, and the height above the liquid surface is conventionally set to be 0.5 to 1.5 m. The designed biogas pressure in the biogas chamber is 50 mbar under normal operating conditions; the second-stage DUO three-phase separator collects the biogas conveying pipe 22: the biogas generated in the third anaerobic reaction zone is collected by the biogas conveying pipe on the upper part of the second-stage DUO three-phase separator, and the biogas is conveyed to the homogenization regulating tank to reduce the interference of the biogas on the fourth reaction zone, which is beneficial to the stability of the anaerobic degradation reaction in the fourth reaction zone and prevents the anaerobic sludge in the fourth anaerobic reaction zone from being wrapped by the biogas and rising and being lost; the anaerobic effluent conveying pipe 23: the effluent collected by the effluent collecting pipe at the top of the anaerobic reactor is conveyed to the effluent distribution riser in the homogenization regulating tank, and the treated wastewater equivalent to the influent volume is discharged to the subsequent treatment system, and the circulating dilution water flows back to the homogenization regulating tank; the first connecting pipe 24: used to connect and balance the biogas pressure at the homogenization regulating tank and the top of the ECSB DUO anaerobic reactor.

[0062] The first-stage DUO type fully covered multi-channel three-phase separator 15 is used to separate the biogas generated in the first and second reaction zones, the anaerobic granular sludge and the treated wastewater. The separated biogas is sent to the homogenization adjustment tank, and the separated anaerobic granular sludge falls back to the first and second anaerobic reaction zones. The wastewater treated in the first and second anaerobic reaction zones rises to the upper third reaction zone for further treatment.

[0063] Two-stage DUO type full-coverage multi-channel three-phase separator 13: It has better separation effect of biogas, anaerobic sludge and wastewater than the inverted triangle biogas collection module of IC internal circulation anaerobic reactor. By setting two rows of downward water flow channels with an inclination of 45 to 60 degrees in the DUO type multi-channel three-phase separator, the biogas rises along the channel wall and gathers in the biogas collection cabin. The anaerobic granular sludge and wastewater after the biogas is removed are separated in the process of flowing downward along the inclined channel. The separated sludge falls into the anaerobic reactor along the interval area, and the separated wastewater flows upward;

[0064] The new DUO multi-channel three-phase separator can better separate the smaller anaerobic granular sludge in the anaerobic reactor, creating good conditions for its gradual proliferation into larger granular sludge, effectively ensuring that more anaerobic granular sludge is retained in the anaerobic reactor, rather than being flushed out of the anaerobic reactor by high rising flow rate like the IC internal circulation anaerobic reactor, causing the problem of "loss of small anaerobic granular sludge". Therefore, the new DUO multi-channel three-phase separator can effectively separate biogas, anaerobic granular sludge and wastewater, while IC actually only has the separation and collection of biogas, and does not have the separation function of granular sludge and wastewater. It completely relies on the weight of the granular sludge itself to achieve the purpose of separating granular sludge from wastewater.

[0065] Liquid level 10 in the oxygen reactor: It is the highest liquid level height of the ECSB DUO anaerobic reactor. Depending on the design, the liquid level height can vary from 15m to 30m.

[0066] Homogenization adjustment tank liquid level 6: The liquid level in the homogenization adjustment tank is conventionally designed to be 0.5 to 1 m lower than that of the ECSB DUO anaerobic reactor.

[0067] Biogas chamber 7 on the upper part of the homogenizing regulating tank: The homogenizing regulating tank is a completely closed structure. The space above the liquid level in the tank is the biogas storage space. The designed biogas pressure under normal operating conditions is 50mba.

[0068] Wastewater treatment inlet pipeline 2: The wastewater to be treated is pumped into the ESCB DUO anaerobic reactor treatment system from the water inlet on the homogenization adjustment tank through the feed lift pump;

[0069] Jet mixing system 3: The fast jet mixing system for rapid mixing of influent, chemical requirements, and anaerobic effluent circulating dilution water is installed in the homogenization adjustment tank to ensure the relative stability of the influent water quantity and water quality of the ECSB DUO anaerobic reactor. The temperature sensor TT for detecting the influent water temperature of the ECSB DUO anaerobic reactor, the wastewater pH sensor, and the flow switch for detecting the flow in the circulation pipeline are installed on the circulation pipeline of the jet mixing system;

[0070] The area located in the "pot-shaped" pulse water distribution system 18 in the anaerobic reactor 19 forms a first anaerobic reaction zone 17, the area located between the "pot-shaped" pulse water distribution system 18 and the first-level DUO type full-coverage multi-channel three-phase separator 15 forms a second anaerobic reaction zone 16, the area located between the first-level DUO type full-coverage multi-channel three-phase separator 15 and the second-level DUO type full-coverage multi-channel three-phase separator 13 forms a third anaerobic reaction zone 14, and the area located between the second-level DUO type full-coverage multi-channel three-phase separator 13 and the anaerobic effluent collection pipe 11 forms a fourth anaerobic reaction zone 12.

[0071] The first anaerobic reaction zone 17 refers to the reaction area inside the "pot-shaped" pulse water distribution system. Due to the strong shearing, turbulence, mixing and stirring effects generated by the "pot-shaped" pulse slit water distributor, the organic pollutants in the incoming water quickly contact and exchange mass with the anaerobic granular sludge in this area, so that the organic pollutants in the wastewater are quickly degraded. At the same time, the large amount of biogas produced also accelerates the mud-water mixing effect in this area and increases the upstream flow rate of the overall mud-water mixture, thereby expanding and fluidizing the granular sludge bed. Therefore, this reaction zone can be merged with the second reaction zone to become the "main reaction zone".

[0072] The second anaerobic reaction zone 16 refers to the space below the first-stage DUO type full-coverage multi-channel three-phase separator and above the top of the "pot-shaped" pulse water distribution system. The reactor has a large number of large-particle anaerobic granular sludge expanded by the high rising flow rate. Under the strong stirring, mixing and shearing effect of the hydraulic force and the large amount of biogas produced, the organic pollutants in the wastewater are degraded into water and carbon dioxide, and a large amount of biogas (methane) is produced. The second anaerobic reaction zone is the largest anaerobic reaction zone in the ECSB DUO anaerobic reactor, and is generally designed to account for more than 60% of the effective volume of the entire anaerobic reactor.

[0073] The third anaerobic reaction zone 14: The third reaction zone is located in the space between the first-stage DUO type full-coverage multi-channel three-phase separator and the second-stage DUO type full-coverage multi-channel three-phase separator. After degradation in the first and second main anaerobic reaction zones, the organic pollutants in the wastewater are greatly reduced, so the amount of biogas produced in this reactor area is much less than that in the first and second reaction zones, and the disturbance of biogas production is also small, so the anaerobic reaction in this reaction zone is also relatively stable. There are large-particle anaerobic granular sludge and small-particle anaerobic granular sludge in this zone, which can further degrade the dissolved organic pollutants in the wastewater. The generated biogas is collected by the second-stage DUO type three-phase separator and transported to the homogenization adjustment tank. The granular sludge falls back to the third reaction zone after separation by the second-stage DUO type three-phase separator. The larger anaerobic granular sludge formed in this zone will pass through the first-stage DUO type three-phase separator and fall back to the first and second anaerobic reaction zones. The treated wastewater enters the fourth reaction zone at the top after separation by the DUO type three-phase separator.

[0074] The fourth anaerobic reaction zone 12 is located under the effluent collection pipe, in the space above the second-stage DUO-type fully covered multi-channel three-phase separator. Here, since the biogas (more than 95%) produced by anaerobism is collected by the first-stage and second-stage DUO-type multi-pass three-phase separators and transported to the homogenization adjustment tank, the anaerobic reaction in the anaerobic reaction zone is very gentle. Only a small amount of small-particle anaerobic granular sludge and wastewater are mass-transferred and a small amount of organic pollutants in the wastewater are anaerobically degraded. The produced biogas directly enters the top biogas storage chamber of the anaerobic reaction zone, and the gradually enlarged anaerobic granular sludge sinks downward and falls into the anaerobic reactor. Some flocculent or small-particle anaerobic sludge is collected by the collection pipe and enters the homogenization adjustment tank.

[0075] Among them, the jet mixing system 3 includes a jet mixer 35 installed on the inner wall of the homogenizing adjustment tank 1, a jet mixer feed pump 32, a homogenizing adjustment tank jet mixing system outlet pipe 33 connected between the homogenizing adjustment tank 1 and the jet mixer feed pump 32, and a jet mixing system circulation reflux pipe 31 connected to the jet mixer feed pump 32 and the jet mixer 35 and arranged outside the homogenizing adjustment tank 1.

[0076] Among them, a pH sensor 36, a TT temperature sensor 37, and a FS flow switch 38 are installed on the circulation return pipe 31 of the jet mixing system.

[0077] Among them, the anaerobic reactor system outlet distribution pipe 25 includes an anaerobic outlet / circulating return water distribution pipe 44 vertically arranged in the homogenization adjustment tank 1, an anaerobic outlet pipe 46 connected to the lower part of the anaerobic outlet / circulating return water distribution pipe 44, an outlet distribution riser 41 connected to the outlet end of the anaerobic outlet pipe 46 and vertically arranged, a waste gas discharge port 43 arranged at the top of the outlet distribution riser 41, and an anaerobic system outlet 42 arranged on the upper side of the outlet distribution riser 41.

[0078] The "pot-shaped" pulse water distribution system 18 includes a pot-shaped sludge hopper 207 installed at the bottom of the anaerobic reactor 19 and supported and fixed by a vertically arranged side wall support pipe 205, and a plurality of water distributors arranged in parallel tangential directions from top to bottom are arranged around the inner wall of the pot-shaped sludge hopper 207;

[0079] The water distributor includes a water distribution pipe 204 arranged on the inner wall of the pot-shaped sludge hopper 207 in a parallel tangent direction from top to bottom, water distribution slits 206 evenly arranged on the side of the water distribution pipe 204 and opening on the same side, and a connecting pipe 203 with a flange plate penetrating the inner wall of the pot-shaped sludge hopper 207 and connected to the water distribution pipe 204; the opening directions of the water distribution slits 206 on adjacent water distribution pipes 204 are staggered in a clockwise direction and a counterclockwise direction, and the end of the connecting pipe 203 is connected to a water distribution connecting pipe 202;

[0080] A cavity structure 214 is formed between the outer wall of the pot-shaped sludge hopper 207 and the inner wall of the lower tank body of the anaerobic reactor 19; the side wall support pipe 205, the water distribution connecting pipe 202, the connecting pipe 203, the counterclockwise water distribution branch pipe 712, and the clockwise water distribution branch pipe 701 are all located in the cavity structure 214.

[0081] In the pot-shaped sludge hopper 207: as shown by the reference numeral 29, it is the clockwise water flow direction 29 induced by the slit water distributor: the slit injection direction on the slit water distributor located on the inner wall of the "pot-shaped" pulse water distribution system is open in the clockwise direction, and when the wastewater is ejected from the slit, a water flow pattern along the clockwise direction is formed inside the "pot-shaped" pulse water distribution system; as shown by the reference numeral 28, it is the counterclockwise water flow direction 28 induced by the slit water distributor: the slit injection direction on the slit water distributor located on the inner wall of the "pot-shaped" pulse water distribution system is open in the counterclockwise direction, and when the wastewater is ejected from the slit, a water flow pattern along the counterclockwise direction is formed inside the "pot-shaped" pulse water distribution system.

[0082] As shown in the figure with reference numeral 211, it is the clockwise water flow direction 211 induced by the slit water distributor: when the fluid injection slit of the slit water distributor is installed in the clockwise direction, a water flow pattern flowing in the clockwise direction will be formed in the "pot-shaped" water distribution system; as shown in the figure with reference numeral 213, it is the counterclockwise water flow direction 213 induced by the slit water distributor: when the fluid injection slit of the slit water distributor is installed in the clockwise direction, a water flow pattern flowing in the counterclockwise direction will be formed in the "pot-shaped" water distribution system.

[0083] The dual-path pulse feeding system 20 includes a variable frequency anaerobic reactor feeding pump 706 connected to the lower side of the homogenizing regulating tank 1, an anaerobic reactor feeding main pipeline 705 connected to the variable frequency anaerobic reactor feeding pump 706, a water distribution pipeline 704 with two flow directions connected to the discharge port of the anaerobic reactor feeding main pipeline 705, a counterclockwise water inlet branch pipe 709 connected to one flow direction of the water distribution pipeline 704, and a clockwise water inlet branch pipe 702 connected to the other flow direction of the water distribution pipeline 704; the end of the counterclockwise water inlet branch pipe 709 is connected to a counterclockwise water distribution branch pipe 712 with the same number of water distribution slits 206 with counterclockwise openings; the end of the clockwise water inlet branch pipe 702 is connected to a clockwise water distribution branch pipe 701 with the same number of water distribution slits 206 with clockwise openings;

[0084] The counterclockwise water distribution branch pipe 712 is connected to the water distribution connecting pipe 202 connected to the water distribution slit 206 opening in the counterclockwise direction, and the clockwise water inlet branch pipe 702 is connected to the water distribution connecting pipe 202 connected to the water distribution slit 206 opening in the clockwise direction; a pulse water distribution system flow control pipe 710 is connected between the counterclockwise water inlet branch pipe 709 and the clockwise water inlet branch pipe 702.

[0085] Among them, the first automatic control pneumatic butterfly valve 703 is installed on the clockwise water inlet branch 702, the second automatic control pneumatic butterfly valve 708 is installed on the counterclockwise water inlet branch 709, the manual butterfly valve 711 is installed on the pulse water distribution system flow control pipeline 710; and the flow meter 707 is installed on the anaerobic reactor supply main pipeline 705.

[0086] Dual-channel pulse feeding system 20: In order to avoid strong swirl inside the "pot-shaped" water distribution system and increase the "turbulence" intensity of the mixing of granular sludge and wastewater in the "pot", we set up two pulse feeding systems to distribute water to the narrow slit water distributor in the "pot" clockwise and counterclockwise respectively. By switching the valve, the two feed pipes can switch 80% and 20% of the flow, and the switching interval is 5 to 10 minutes. The dual-channel pulse feeding system can greatly enhance the material mixing (granular sludge and wastewater) intensity and mass transfer intensity in the "pot-shaped" water distribution system, and improve the degradation effect of wastewater in this area.

[0087] Among them, the first-stage DUO type fully covered multi-channel three-phase separator 15 is supported by a support frame 54 on the inner side wall of the high-speed anaerobic reactor shell 1; the first-stage DUO type fully covered multi-channel three-phase separator 15 is supported by an internal frame support plate 57 to form a circular three-phase separator that can cover the entire cross-section of the anaerobic reactor 19; the first-stage DUO type fully covered multi-channel three-phase separator 15 includes a bucket-shaped biogas collection cabin 513 and an intermediate main biogas chamber 524 and two-side biogas chambers 515 separated from its internal space; a first separation channel 59 is provided at the lower side of the biogas collection cabin 513, and a second separation channel 512 is symmetrically provided at the upper side of the biogas collection cabin 513 located on the first separation channel 512, and an anaerobic sludge falling gap 58 is provided at the bottom of the biogas collection cabin 513; In the UO type full-coverage multi-channel three-phase separator 56, above the inner liquid level 514, there are respectively provided with a biogas collecting connecting pipe 516 connecting the biogas collecting cabin 513 and the side biogas chamber 515. The biogas collecting connecting pipe 516 is connected to the middle main biogas chamber 524 and then collected in the biogas collecting main pipe 523, and then connected to the first-stage DUO type three-phase separator biogas collecting and conveying pipe 21 with a flange to enter the homogenizing and regulating tank 1; the first-stage DUO type three-phase separator biogas collecting and conveying pipe 21: the biogas generated in the first anaerobic reaction zone and the second anaerobic reaction zone (i.e., the main reaction zone) is sent to the homogenizing and regulating tank through the biogas collecting and conveying pipe on the upper part of the first-stage DUO type three-phase separator to reduce the interference of the biogas on the third reaction zone, which is beneficial to the stability of the anaerobic degradation reaction in the third reaction zone.

[0088] Among them, the first separation channel 59 and the second separation channel 512 are both downward water flow channels with a slope of 45 to 60 degrees, which are used to complete the functions of biogas separation and solid-liquid separation of granular sludge and wastewater; the first separation channel 59 and the second separation channel 512 are both channels composed of parallel plates 525, and a spacing of 100 mm is set between adjacent parallel plates 525. The parallel plates 525 are supported by internal frame support plates 57 to maintain the spacing between the parallel plates and the overall fixation.

[0089] As shown in the figure 84, the rising flow direction of biogas in the biogas collection chamber of the DUO type multi-channel three-phase separator is 84: the biogas generated by the anaerobic system flows upward in the vertical direction and is collected by the biogas collection chamber on the top of the DUO type three-phase separator. As shown in the figure 83, the large-particle anaerobic granular sludge in the biogas collection chamber of the DUO type multi-channel three-phase separator is 83. The large-particle anaerobic granular sludge in the anaerobic reactor can move downward completely by its own weight and remain in the anaerobic reactor.

[0090] As shown in the figure with reference numeral 81, it is the path 81 of the separation of small anaerobic granular sludge in the anaerobic reactor along the separation channel in the DUO type multi-channel three-phase separator: a large amount of small granular sludge and a small amount of large granular sludge will be separated into biogas, granular sludge and wastewater in the first separation channel 59 and the second separation 512 in the DUO type three-phase separator, the biogas flows upward along the channel wall and gathers at the top of the biogas collection chamber 513 of the DUO type multi-channel three-phase separator, the anaerobic sludge and wastewater after the biogas is removed are separated in the process of going down the channel, the separated anaerobic granular sludge is easier to settle into the anaerobic reactor due to the absence of biogas disturbance, and the wastewater after the anaerobic granular sludge is separated flows upward in the vertical direction.

[0091] As shown by reference numeral 82 , this is the rising flow state 82 of the wastewater after the sludge and wastewater mixture is separated through the mud-water separation channel: after the mud-water separation, the wastewater flows in the vertical direction of the anaerobic reactor.

[0092] The upper part of the anaerobic effluent collecting pipe 11 is evenly and laterally provided with openings 111 , and the openings 111 are located 200 mm below the liquid level in the anaerobic reactor.

[0093] The top of the anaerobic reactor 19 is provided with a biogas pressure sensor 26 for detecting the biogas pressure in the biogas chamber 9 at the top of the anaerobic reactor and a conductivity foam detector 27 for detecting the foam generated at the top of the anaerobic reactor 19 .

[0094] Beneficial effects:

[0095] The external circulation large aspect ratio granular sludge anaerobic reactor system of the present invention is a new type of high-speed anaerobic reactor. On the basis of maintaining the high rising flow rate and high volumetric load rate of the high-speed anaerobic reactor, the commonly used IC internal circulation anaerobic reactor is innovatively improved in terms of water distribution mode, three-phase separator separation mode and effluent collection mode, including the following beneficial effects:

[0096] 1. The present invention adopts a new type of "pot-shaped" pulse water distribution system, which not only avoids the problem of water distribution system blockage in the treatment of papermaking wastewater containing high concentrations of calcium ions, but also avoids the generation of strong vortexes inside the "pot-shaped" water distribution system by setting up a dual-path "pulse" feeding system with different flow rates and interval switching, thereby increasing the "turbulence" intensity of the mixing of granular sludge and wastewater in the "pot". The dual-path pulse feeding system can enhance the material mixing (granular sludge and wastewater) intensity and mass transfer intensity in the "pot-shaped" water distribution system, and improve the degradation effect of wastewater in this area. The slit water distributor set in the "pot" can be regularly cleaned with citric acid or oxalic acid to prevent clogging of the water distribution slit. The bottom of the "pot-shaped" water distribution system can be convenient for discharging and injecting anaerobic granular sludge (such as granular sludge that has failed calcification);

[0097] 2. The three-phase separator of the present invention is the most core component of the anaerobic reactor. Whether it can effectively separate granular sludge, biogas and wastewater is the most important evaluation indicator for measuring the three-phase separation. The new DUO type multi-channel three-phase separator has the functions of separating biogas from granular sludge / wastewater mixture and separating granular sludge from wastewater. Such a two-stage separation mode can greatly improve the retention capacity of anaerobic granular sludge in the anaerobic reactor, ensuring that small particles of anaerobic granular sludge will not be flushed out of the anaerobic reactor under the action of the hydraulic pressure of the IC internal circulation anaerobic reactor and the rise of biogas. This is the biggest advantage of the new anaerobic reactor. At the same time, since the biogas collected by the first and second stage DUO type multi-channel three-phase separators is transported to the homogenization and conditioning tank instead of rising along the anaerobic reactor, the stability of the anaerobic reaction in the third and fourth anaerobic reaction zones is guaranteed, and the risk of anaerobic granular sludge being flushed out of the anaerobic reactor is reduced;

[0098] 3. The present invention adopts a submerged effluent collection pipe to replace the effluent mode of the conventional anaerobic reactor using a sawtooth overflow weir plate, which can greatly improve the uniformity and stability of the effluent;

[0099] 4. The novel anaerobic reactor system of the present invention is a completely closed anaerobic treatment system. The top of the anaerobic system is a biogas storage space, which does not require the biogas pressure regulator cabinet required for the IC internal circulation anaerobic reactor, thereby reducing the risk of biogas treatment. At the same time, the novel anaerobic reactor system does not have waste gas that needs to be treated at the top of the IC anaerobic reactor, which simplifies the design of the anaerobic reactor;

[0100] 5. The novel anaerobic reactor of the present invention does not have an internal mixed liquid riser and downcomer similar to the IC anaerobic reactor, but only has a biogas collection and delivery pipe, which can effectively avoid the anaerobic reactor failure problem caused by blockage of the riser and downcomer in the process of treating papermaking wastewater containing high concentration of calcium ions in the IC internal circulation anaerobic reactor;

[0101] 6. Although the novel anaerobic reactor of the present invention does not have the enhanced mixing and mass transfer effect brought by the internal circulation of the IC internal circulation anaerobic reactor, the "pot-shaped" pulse water distribution system can still fully meet the mixing and mass transfer intensity requirements required by the anaerobic reaction process. It will not have any impact on the performance of the anaerobic reactor. Compared with the comparative analysis of the IC internal circulation anaerobic reactor, the novel anaerobic reactor system and device have a more stable and efficient treatment effect and have broad application prospects.

[0102] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An external circulation large aspect ratio granular sludge anaerobic reactor system, characterized in that: The invention comprises a homogenizing regulating tank (1), an anaerobic reactor (19), an anaerobic reactor system outlet water distribution pipe (25) installed on the upper side of the homogenizing regulating tank (1), a chemical dosing pipe (4) installed on the side of the homogenizing regulating tank (1), a jet mixing system (3) installed on the lower side of the homogenizing regulating tank (1), a first-stage DUO-type full-coverage multi-channel three-phase separator (15) installed in the anaerobic reactor (19), and a second-stage DUO-type full-coverage multi-channel three-phase separator (15) arranged above the first-stage DUO-type full-coverage multi-channel three-phase separator (15). 13), an anaerobic effluent collection pipe (11) installed above the secondary DUO type full-coverage multi-channel three-phase separator (13) and below the liquid level (10) in the anaerobic reactor, a "pot-shaped" pulse water distribution system (18) installed at the bottom of the anaerobic reactor (19), and a dual-path pulse feed system (20) connected between the "pot-shaped" pulse water distribution system (18) and the bottom of the homogenization adjustment tank (1); the primary DUO type full-coverage multi-channel three-phase separator (15) has the same structure as the secondary DUO type full-coverage multi-channel three-phase separator (13); The top of the homogenizing and regulating tank (1) is provided with a biogas discharge and utilization outlet (8) which is connected to the upper biogas chamber (7) of the homogenizing and regulating tank at the top of the homogenizing and regulating tank (1); The top of the anaerobic reactor (19) is located above the liquid level (10) in the anaerobic reactor, and between the top wall of the anaerobic reactor (19) and the top biogas chamber (9) of the anaerobic reactor is formed. The top biogas chamber (9) of the anaerobic reactor is connected to the upper biogas chamber (7) of the homogenizing regulating tank via a first connecting pipe (24). The anaerobic effluent collecting pipe (11) and the anaerobic reactor system effluent distribution pipe (25) are connected via an anaerobic effluent transmission pipe (24) arranged above the liquid level (6) of the homogenizing regulating tank. The first-stage DUO type full-coverage multi-channel three-phase separator (15) and the homogenizing and regulating tank (1) are connected via a first-stage DUO type three-phase separator collecting biogas conveying pipe (21); the top of the second-stage DUO type full-coverage multi-channel three-phase separator (13) and the homogenizing and regulating tank (1) are connected via a second-stage DUO type three-phase separator collecting biogas conveying pipe (22); the lower side of the homogenizing and regulating tank (1) is provided with a treated wastewater inlet pipe (2); The area of ​​the anaerobic reactor (19) located in the "pot-shaped" pulse water distribution system (18) forms a first anaerobic reaction zone (17), the area between the "pot-shaped" pulse water distribution system (18) and the first-level DUO type full-coverage multi-channel three-phase separator (15) forms a second anaerobic reaction zone (16), the area between the first-level DUO type full-coverage multi-channel three-phase separator (15) and the second-level DUO type full-coverage multi-channel three-phase separator (13) forms a third anaerobic reaction zone (14), and the area between the second-level DUO type full-coverage multi-channel three-phase separator (13) and the anaerobic effluent collection pipe (11) forms a fourth anaerobic reaction zone (12); The "pot-shaped" pulse water distribution system (18) comprises a pot-shaped sludge hopper (207) installed at the lower part of the anaerobic reactor (19) and supported and fixed by a vertically arranged side wall support pipe (205), and a plurality of water distributors arranged in parallel tangential directions from top to bottom and arranged around the inner wall of the pot-shaped sludge hopper (207); The water distributor comprises a water distribution pipe (204) arranged on the inner wall of the pot-shaped sludge hopper (207) in a parallel tangent direction from top to bottom, water distribution slits (206) evenly arranged on the side of the water distribution pipe (204) and opening on the same side, and a connecting pipe (203) with a flange plate penetrating the inner wall of the pot-shaped sludge hopper (207) and connected to the water distribution pipe (204); the opening directions of the water distribution slits (206) on adjacent water distribution pipes (204) are staggered in a clockwise direction and a counterclockwise direction, and the end of the connecting pipe (203) is connected to a water distribution connecting pipe (202); The first-stage DUO type fully covered multi-channel three-phase separator (15) is supported by a support frame (54) on the inner side wall of the high-speed anaerobic reactor shell; the first-stage DUO type fully covered multi-channel three-phase separator (15) is supported by an internal frame support plate (57) to form a circular three-phase separator that can cover the entire cross-section of the anaerobic reactor (19); the first-stage DUO type fully covered multi-channel three-phase separator (15) comprises a bucket-shaped biogas collection cabin (513) and an intermediate main biogas chamber (524) and two side biogas chambers (515) separated by its internal space; the lower side of the biogas collection cabin (513) is provided with a first separation channel (59), and the biogas collection cabin ( 513) is symmetrically arranged on the upper side of the first separation channel (59), and a second separation channel (512) is symmetrically arranged, and an anaerobic sludge falling gap (58) is arranged at the bottom of the biogas collection chamber (513); biogas collection connecting pipes (516) connecting the biogas collection chamber (513) and the side biogas chamber (515) are arranged above the internal liquid surface (514) in the DUO type full-coverage multi-channel three-phase separator (56), and the biogas collection connecting pipes (516) are connected to the middle main biogas chamber (524) and then collected in the biogas collection main pipe (523), and then connected to the first-level DUO type three-phase separator collecting biogas conveying pipe (21) with a flange plate to enter the interior of the homogenization adjustment tank (1).

2. The external circulation large aspect ratio granular sludge anaerobic reactor system according to claim 1 is characterized in that: The jet mixing system (3) comprises a jet mixer (35) mounted on the inner wall of a homogenizing and regulating tank (1), a jet mixer feed pump (32), a homogenizing and regulating tank jet mixing system outlet pipe (33) connected between the homogenizing and regulating tank (1) and the jet mixer feed pump (32), and a jet mixing system circulation reflux pipe (31) connected to the jet mixer feed pump (32) and the jet mixer (35) and arranged outside the homogenizing and regulating tank (1).

3. The external circulation large aspect ratio granular sludge anaerobic reactor system according to claim 2 is characterized in that: A pH sensor (36), a TT temperature sensor (37), and a FS flow switch (38) are installed on the circulation reflux pipeline (31) of the jet mixing system.

4. The external circulation large aspect ratio granular sludge anaerobic reactor system according to claim 1, characterized in that: The anaerobic reactor system water outlet distribution pipe (25) comprises an anaerobic water outlet / circulating return water distribution pipe (44) vertically arranged in the homogenizing adjustment tank (1), an anaerobic water outlet pipe (46) connected to the lower part of the anaerobic water outlet / circulating return water distribution pipe (44), a water outlet distribution riser (41) connected to the water outlet end of the anaerobic water outlet pipe (46) and vertically arranged, a waste gas discharge port (43) arranged at the top end of the water outlet distribution riser (41), and an anaerobic system water outlet (42) arranged at the upper side of the water outlet distribution riser (41).

5. The external circulation large aspect ratio granular sludge anaerobic reactor system according to claim 1, characterized in that: The dual-path pulse feeding system (20) comprises a variable frequency anaerobic reactor feeding pump (706) connected to the lower side of the homogenizing and regulating tank (1), an anaerobic reactor feeding main pipeline (705) connected to the variable frequency anaerobic reactor feeding pump (706), a water distribution pipeline (704) with two flow directions connected to the outlet of the anaerobic reactor feeding main pipeline (705), and a counterclockwise water inlet branch pipe (706) connected to one flow direction of the water distribution pipeline (704). 709), a clockwise water inlet branch pipe (702) connected to another flow direction of the water distribution pipe (704); the end of the counterclockwise water inlet branch pipe (709) is connected to a counterclockwise water distribution branch pipe (712) whose number is the same as the number of water distribution slits (206) with counterclockwise openings; the end of the clockwise water inlet branch pipe (702) is connected to a clockwise water distribution branch pipe (701) whose number is the same as the number of water distribution slits (206) with clockwise openings; The counterclockwise water distribution branch pipe (712) is connected to the water distribution connecting pipe (202) connected to the water distribution slit (206) opening in the counterclockwise direction, and the clockwise water inlet branch pipe (702) is connected to the water distribution connecting pipe (202) connected to the water distribution slit (206) opening in the clockwise direction; a pulse water distribution system flow control pipe (710) is connected between the counterclockwise water inlet branch pipe (709) and the clockwise water inlet branch pipe (702).

6. The external circulation large aspect ratio granular sludge anaerobic reactor system according to claim 5, characterized in that: The clockwise water inlet branch pipe (702) is equipped with a first automatic control pneumatic butterfly valve (703), the counterclockwise water inlet branch pipe (709) is equipped with a second automatic control pneumatic butterfly valve (708), the pulse water distribution system flow control pipeline (710) is equipped with a manual butterfly valve (711); and the anaerobic reactor feed main pipeline (705) is equipped with a flow meter (707).

7. The external circulation large aspect ratio granular sludge anaerobic reactor system according to claim 1, characterized in that: The first separation channel (59) and the second separation channel (512) are both downward water flow channels with a slope of 45 to 60 degrees, which are used to complete the functions of biogas separation and solid-liquid separation of granular sludge and wastewater; the first separation channel (59) and the second separation channel (512) are both channels composed of parallel plates (525), and a spacing of 100 mm is set between adjacent parallel plates (525). The parallel plates (525) are supported by internal frame support plates (57) to maintain the spacing between the parallel plates and fix the whole.

8. The external circulation large aspect ratio granular sludge anaerobic reactor system according to claim 1, characterized in that: The upper part of the anaerobic effluent collection pipe (11) is uniformly and laterally provided with openings (111), and the openings (111) are located 200 mm below the liquid level in the anaerobic reactor.

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