An intermittent all-round mixed anaerobic reactor

Abstract

The present invention discloses an intermittent all-round mixing anaerobic reactor, and relates to the technical field of water pollution treatment. The present invention comprises a reactor shell, a flow guide jet pipe, a top material negative pressure suction and descending flow guide pipe, a material feed port, a pumping mixed liquid jet water distribution pipe, a pumping mixed liquid collecting pipe which is transversely arranged at the upper part of the reactor shell through a collecting pipe bracket and has pumping ports evenly distributed on the surface, a water distribution pipe connected to the bottom of the pumping mixed liquid jet water distribution pipe, a pumping mixed liquid descending pipe connected to the outer end of the pumping mixed liquid collecting pipe and vertically arranged, and a circulating slurry pump installed between the pumping mixed liquid descending pipe and the water distribution pipe. The present invention effectively solves the problem of top scum crusting that often occurs in continuous stirring and mixing anaerobic reactors and greatly improves the all-round mixing and stirring effects in the tank, making it more stable in operation, better in treatment effect, and lower in operating cost than similar anaerobic reactors, and has broad market application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of water pollution treatment, and in particular relates to an intermittent all-round mixed anaerobic reactor. Background Art

[0002] In recent years, with the widespread application of anaerobic technology in China, continuously stirred tank reactors (CSTR) have been widely used in China, mainly used in the anaerobic treatment of livestock and poultry manure, municipal residual biochemical sludge, industrial residual biochemical sludge, kitchen waste, cheese wastewater containing high suspended solids, and soybean processing wastewater. The widespread application of these CSTR anaerobic reactors has played a great role in reducing the total amount of pollutant emissions and protecting the environment. At the same time, the usable energy produced by anaerobes - biogas, has also reduced the operating costs of environmental protection facilities to a certain extent.

[0003] The successful operation of the CSTR anaerobic reactor depends on the following conditions in addition to the material's own characteristics: (1) The uniformity of stirring: It is related to whether the material can fully contact, transfer mass and be degraded with the anaerobic microorganisms in the reactor; (2) Temperature conditions: The conventional anaerobic digestion temperature is the optimal temperature of mesophilic anaerobic digestion: 35-37°C; (3) pH: It refers to the pH of the mixed material in the anaerobic reactor. The normal operating pH of the conventional anaerobic reactor is 6.8-7.3. Among them, the stirring method in the anaerobic reactor is the focus of the anaerobic process. Its purpose is to maximize the uniformity of material mixing in the anaerobic reactor. At present, the commonly used stirring forms in engineering applications are: (1) Mechanical top stirring: This stirring form has been widely used since the emergence of this process. The method is mature in technology, but the disadvantage is that when treating wastewater from certain industries, a scum layer will form on the top of the reactor. In the case of long-term operation, the scum layer will form a crust and is difficult to remove, which will affect the rise of biogas and the degree of material mixing, thereby causing the anaerobic treatment efficiency to slowly decrease. The top scum needs to be cleaned regularly; (2) Mechanical side stirring: By setting side stirring devices at different heights in the reactor, the problem of scum layer crusting can be alleviated to a certain extent, but it is difficult to fundamentally solve the problem; (3) Biogas stirring: The principle of biogas stirring is the gas lift principle. A guide tube is set in the anaerobic reactor, and biogas is introduced at the bottom of the guide tube. During the rise of the biogas, it is lifted together with the mixed material and released at the top of the guide tube, thereby forming multiple upper and lower circulation areas in the reactor to achieve the purpose of mixing the upper and lower materials. However, this method is still difficult to solve the problem of top scum.

[0004] In order to solve the problem of scum on the top of CSTR anaerobic reactor in current engineering applications, domestic experts and enterprises have also conducted a lot of exploration. For example, patent number: ZL 200620161616.8 (a device that can prevent and eliminate scum crusting in anaerobic reaction tanks) uses a high-pressure water pump to return the biogas slurry and spray it upward on the biogas slag layer to break the biogas slag crusting layer; patent number: CN201110232206.3 (fermentation liquid stirring device) describes the design of the measuring stirrer and the return material guide tube to achieve the purpose of uniform mixing of materials; literature: "Agricultural Mechanization Research" October 2014, Issue 10, "Crusting and Shell Breaker Design of Biogas Pool", Lv Jianqiang et al. described a mechanical shell breaking device. There are many other patents and documents that are trying to solve the current practical problems of uneven mixing and scum crusting in CSTR fully mixed continuous stirring anaerobic reactors through process design changes, equipment improvements, device research and development, etc.

[0005] Based on the previous results of experts and enterprises in solving the problems existing in CSTR anaerobic reactors, the present invention improves the mixing effect and uniformity of the existing CSTR reactor and thoroughly solves the problem of scum crust layer that plagues the process. The jet mixer is integrated into the new fully mixed anaerobic reactor, thereby fundamentally solving the biggest problems faced by the above two fully mixed anaerobic reactors. At the same time, based on our many years of experience in anaerobic process treatment of wastewater and high-solid content organic waste, the continuous stirred mixing anaerobic reactor (CSTR) is converted into a batch stirred mixing anaerobic reactor (BSTR). Under the operating conditions of intermittent feeding, intermittent stirring and intermittent discharging, on the one hand, the occurrence of "short flow" phenomenon of material feeding can be avoided; secondly, after the material feeding is mixed with the anaerobic microorganisms in the reactor, there is a relatively "calm" reaction time, which is conducive to the steady-state operation of the anaerobic reactor; furthermore, by setting up a scum diversion device and a scum suction jet mixing and stirring intensification system, the reactor can continuously form a combined mixing effect of "horizontal flow along the tank" and "vertical flow along the tank from top to bottom", that is, the "360° all-round intermittent mixing anaerobic reactor" described in the present invention, referred to as 360BSTR anaerobic reactor device. The 360BSTR anaerobic reactor of the present invention mainly includes a scum suction guide tube, a fast stirring and mixing propeller and an injection pipeline, a scum suction jet mixing all-round stirring and strengthening system, a top double-membrane biogas pressure stabilizing cabinet, a bottom sand collection and discharge system, etc. Summary of the invention

[0006] The present invention provides an intermittent all-round mixed anaerobic reactor, which solves the above problems.

[0007] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0008] The present invention discloses an intermittent all-round mixing anaerobic reactor, comprising a reactor shell, a guide jet pipe arranged at one side of the bottom of the reactor shell and fixedly installed by a bracket, a top material negative pressure suction and descending guide pipe connected to the top of the guide jet pipe and vertically arranged near the inner wall and fixed by a support frame, a material feed port arranged at the side of the reactor shell and having an inner bottom end corresponding to the top opening of the top material negative pressure suction and descending guide pipe, a pumping mixed liquid jet water distribution pipe vertically arranged at the other inner wall of the reactor shell and fixedly installed by a bottom support and a fixed bracket, a pumping mixed liquid collecting pipe transversely arranged at the upper part of the reactor shell through a collecting pipe bracket and having pumping ports uniformly distributed on the surface, a water distribution pipe connected to the external bottom of the pumping mixed liquid jet water distribution pipe, a pumping mixed liquid descending pipe connected to the outer end of the pumping mixed liquid collecting pipe and vertically arranged, and a circulating slurry pump installed between the pumping mixed liquid descending pipe and the water distribution pipe;

[0009] The guide injection pipe generates local negative pressure by operating a fast stirring plug flow mixer installed in cooperation with the shell sealing structure, so as to suck the top scum layer in the reactor shell into the guide injection pipe, and then the fast stirring plug flow mixer sprays it out from the injection direction set by the guide injection pipe;

[0010] The scum layer on the top of the pumping reactor shell is collected by the pumping mixed liquid collecting pipe, and sent to the pumping mixed liquid downcomer, driven into the water distribution pipe by the circulating slurry pump, and sprayed out by the pumping mixed jet mixing nozzles vertically and evenly arranged on the pumping mixed liquid jet water distribution pipe.

[0011] Furthermore, the injection direction of the guide injection pipe forms an angle of 15-30° with the inner bottom plate of the reactor shell, and the ejected material forms a horizontal mixing propulsion flow along the lateral direction of the tank and a vertical upward flow of the injected material.

[0012] Furthermore, the jet injection direction of the material mixture induced by the extraction mixing jet mixing nozzle is consistent with the material flow direction of the guide injection pipe, thereby enhancing the fluidity of the horizontal mixing propulsion flow along the lateral direction of the tank and the vertical upward flow of the injected material.

[0013] Furthermore, a first-level mixed liquid jet nozzle of reduced diameter type is provided at the opening position of the distribution pipe connected to the extraction mixing jet mixing nozzle and the extraction mixing liquid jet distribution pipe, the end of the extraction mixing jet mixing nozzle is a second-level mixed liquid jet nozzle of reduced diameter type, and an external material suction port is provided on the side of the mixing chamber between the first-level mixed liquid jet nozzle and the second-level mixed liquid jet nozzle.

[0014] Furthermore, the sludge and mud-water mixture entering from the extraction mixed liquid jet water distribution pipe is ejected outward from the first-level mixed liquid jet nozzle through the mixing chamber in the direction of the mixed liquid jet, so that a negative pressure is formed in the mixing chamber. The external material of the extraction mixed jet mixing nozzle is sucked in through the external material suction port along the direction of the sucked mixed liquid fluid, mixed with the material ejected from the first-level nozzle and travels along the injection direction to the second-level mixed liquid jet nozzle and is ejected in the direction of the mixed material dispersion flow.

[0015] Furthermore, a double-membrane biogas pressure-stabilizing storage cabinet with a pressure-stabilizing air cavity is provided on the top of the reactor shell, and the double-membrane biogas pressure-stabilizing storage cabinet comprises an outer membrane and an inner membrane, and a biogas space is provided in the inner membrane.

[0016] Furthermore, a discharge port with a water seal is provided on the upper side of the reactor shell.

[0017] Furthermore, a bottom sand settling tank is arranged at the center of the bottom of the reactor shell, and a vent pipe is externally connected to the bottom sand settling tank.

[0018] Furthermore, a suction port top baffle is provided in the reactor shell at one side of the top of the negative pressure suction descending guide pipe for the top material.

[0019] Furthermore, an anti-vortex baffle is provided on the inner side wall of the reactor shell.

[0020] Furthermore, a liquid temperature sensor is installed on the pumped mixed liquid downcomer.

[0021] Furthermore, an ultrasonic level meter is installed in the pressure-stabilizing air cavity.

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

[0023] 1. It has all-round mixing, stirring and homogenizing effects: the scum is sucked to the bottom of the reactor by a fast-rotating mechanical flow propeller and sprayed in a certain direction, forming a "horizontal mixing lateral flow" at the bottom of the reactor to prevent the sedimentation of sludge and mud sand at the bottom; the designed scum suction jet mixing and stirring strengthening system solves the problem that the stirring performance of the upper part of the reactor is quickly attenuated in the horizontal and vertical directions due to the spraying of materials at the bottom. By setting up the scum suction jet mixing and stirring strengthening system, it not only enhances the destruction and suction capacity of the top scum, but also maintains a high-intensity "horizontal mixing lateral flow" in the upper part of the reactor, ensuring the mixing, mass transfer and stirring performance of the materials outside the tank. At the same time, under the action of the two-stage scum suction, a "circular mixing vertical flow" from top to bottom and then from bottom to top is formed in the BSTR tank, which greatly improves the mixing and homogenizing effect of the reactor, thereby greatly improving the stability and processing capacity of the reactor.

[0024] 2. It effectively solves the problem of scum crusting on the top of conventional anaerobic reactors; the secondary scum suction circulation system is the biggest advantage of this new reactor.

[0025] 3. Introducing the jet mixing device into the fully mixed anaerobic reactor to enhance the material mixing degree and slag suction capacity in the anaerobic reactor is the most important design for the new anaerobic reactor to achieve all-round mixing and stirring.

[0026] 4. The process operation mode of intermittent feeding, intermittent suction circulation mixing and stirring, and intermittent discharging can save operating costs to a certain extent, improve the stability of anaerobic system treatment, and does not affect the anaerobic treatment efficiency of the treated materials compared to the continuous mixing and stirring anaerobic reactor (CSTR) commonly used in engineering applications.

[0027] 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

[0028] 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.

[0029] Figure 1 This is a schematic structural diagram of an intermittent all-round mixed anaerobic reactor of the present invention;

[0030] Figure 2 for Figure 1 Schematic diagram of the installation and working principle of the medium-extraction mixed liquid jet water distribution pipe and the extraction mixed jet mixing nozzle;

[0031] Figure 3 for Figure 2 The left view of the structure;

[0032] Figure 4 for Figure 1 Schematic diagram of top diversion;

[0033] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0034] 1-reactor shell, 101-top baffle of suction port, 102-anti-vortex baffle, 2-bracket, 3-flow guide injection pipe, 4-shell sealing structure, 5-rapid stirring plug flow mixer, 6-top material negative pressure suction and descending flow guide pipe, 7-suction material flow direction, 8-injection material vertical upward flow, 9-support frame, 10-liquid level height in the tank, 11-scum layer, 12-material feed port, 13-scum flow direction, 14-biogas space, 15-inner membrane, 16-pressure-stabilizing air cavity, 17-outer membrane, 18-ultrasonic level meter, 19-discharge port, 20-suction port, 21-suction mixed liquid collection pipe, 211-collection pipe bracket, 22-suction mixed liquid down pipe , 23-extraction mixed liquid jet water distribution pipe, 24-extraction mixed jet mixing nozzle, 241-first-stage mixed liquid jet nozzle, 242-mixing chamber, 243-external material suction port, 244-mixed liquid jet direction, 245-external material fluid direction, 246-material suction liquid after mixing and spraying direction, 247-mixed material dispersion flow direction, 248-secondary mixed liquid jet nozzle, 249-water distribution pipe opening, 25-material mixed liquid jet spray direction, 26-fixed bracket, 27-horizontal mixing propulsion flow along the transverse direction of the tank, 28-liquid temperature sensor, 29-circulating slurry pump, 30-water distribution pipe, 31-vent pipe, 32-bottom support, 33-bottom sand settling tank. DETAILED DESCRIPTION

[0035] 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.

[0036] In the description of the present invention, it is necessary to understand that the terms "inside", "bottom", "one side", "top", "close to", "inner wall", "the other inner wall" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred components or elements must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0037] The intermittent all-round mixed anaerobic reactor of the present invention is mainly suitable for anaerobic digestion treatment of high-solid content materials, especially anaerobic biological treatment of high-concentration and high-suspended organic waste liquid containing light substances that are easy to float, such as mixed manure and kitchen waste from large-scale pig farms;

[0038] See also Figure 1-4As shown, an intermittent all-round mixing anaerobic reactor of the present invention comprises a reactor shell 1, a guide injection pipe 3 arranged at one side of the bottom of the reactor shell 1 and fixedly installed by a bracket 2, a top material negative pressure suction and descending guide pipe 6 connected to the top of the guide injection pipe 3 and vertically arranged close to the inner wall and fixed by a support frame 9, a material feed port 12 arranged at the side of the reactor shell 1 and having an inner bottom end corresponding to the top opening of the top material negative pressure suction and descending guide pipe 6, a suction mixed liquid jet water distribution pipe 23 vertically arranged at the other inner side wall of the reactor shell 1 and fixedly installed by a bottom support 32 and a fixed bracket 26, a suction mixed liquid collecting pipe 21 transversely arranged at the upper part of the reactor shell 1 through a collecting pipe bracket 211 and having suction ports 20 uniformly distributed on the surface, a water distribution pipe 30 externally connected to the bottom of the suction mixed liquid jet water distribution pipe 23, and a suction mixed liquid collecting pipe 23 connected to the suction mixed liquid jet water distribution pipe 23. The outer end of the combined liquid collecting pipe 21 is connected to a vertically arranged pumping mixed liquid downcomer 22, and a circulating slurry pump 29 is installed between the pumping mixed liquid downcomer 22 and the water distribution pipe 30; the suction material flow direction 7 in the negative pressure suction downcomer 6 of the top material is from top to bottom; the bracket 2 is used to support the external injection pipeline of the rapid stirring plug flow mixer to prevent the negative pressure suction injection pipe from shifting or shaking; the guide injection pipe 3 forms a local negative pressure when the rapid stirring plug flow mixer is in operation, and the scum on the top of the BSTR is sucked into the guide injection pipe, and is ejected from the injection pipe along the set injection direction by the rapidly rotating rapid stirring plug flow mixer 5, and forms a "horizontal mixing propulsion flow along the tank transversely", so that the scum mixed liquid sucked from the top of the reactor and the anaerobic sludge at the bottom of the reactor are fully mixed and mass transferred, so as to achieve the purpose of uniform mixing of materials and degradation of organic pollutants. The rapid stirring plug mixer 5 rotates rapidly under the drive of the motor outside the tank, and the material in the guide injection pipe 3 is quickly pushed outward along the injection pipe direction, and a local negative pressure is formed inside. Under the action of the negative pressure, the scum and mixed liquid on the top of the tank body are sucked down along the negative pressure of the top material and the guide pipe 6 enters the guide injection pipe 3, forming a "horizontal injection flow along the tank" and a vertical upward flow of the injection material, thereby completing the uniform mixing of the material (including the scum) in the tank;

[0039] Among them, the circulating slurry pump 29 is used to suck the scum and top mixed materials to the suction mixed liquid jet distribution pipe 23 under the action of the slurry pump, and spray them to the BSTR anaerobic reactor along the set spraying direction through the suction mixed jet mixing nozzle 24. On the one hand, it strengthens the top scum suction function, and on the other hand, it strengthens the material mixing, stirring intensity and effect in the middle and upper part of the BSTR, thereby improving the mud-water mass transfer effect and pollutant removal effect.

[0040] The suction port 20 is 20 to 30 cm below the liquid level at the top of the semicircular tank at the top of the reactor, and a plurality of suction ports for scum and mud-water mixture are provided. The scum at the top of the area is pumped to the suction mixed liquid jet distribution pipe 23 through the suction port by the circulating slurry pump 29, and then sprayed to the anaerobic reactor.

[0041] Among them, the material feed port 12 is located on the liquid surface of the top material negative pressure suction downdraft guide tube 6. When the reactor is fed, all suction actions stop, and the feed pump pumps the material from the outside of the tank into the liquid surface of the top material negative pressure suction downdraft guide tube 6. At the same time, the BSTR anaerobic reactor discharge port water seal and discharge port 19 located on the other side of the tank body discharge the treated material of the same volume as the feed from the BSTR anaerobic reactor (the inner part of the discharge port tank body is located 1.5 to 2 meters below the liquid surface, and no short-circuit phenomenon will be formed, that is, the phenomenon that part of the feed is not treated and is directly discharged from the discharge port will not occur).

[0042] Among them, the discharge port 19 is located in the tank and the discharge pipe is located 1.5 to 2 meters below the liquid surface. The external water seal height is based on the set BSTR top biogas pressure to set the water seal pipe and overflow discharge pipe height. The reactor feed and discharge mode is fed in static state and overflow discharge mode is simultaneously static, which effectively avoids the "short-flow phenomenon" that part of the feed is not degraded and discharged from the reactor under operating conditions.

[0043] Among them, the reactor shell 1 adopts the BSTR reactor shell, which can adopt civil construction or tank structure (carbon steel anti-corrosion welding tank, enamel assembly tank, etc.), and the external insulation layer is generally 50mm thick polyurethane foam or rock wool, and the color steel plate is applied externally. For the traditional mechanical stirring CSTR anaerobic reactor, due to the limitation of the stirring form, there are corresponding requirements for the height-to-diameter ratio of the anaerobic reactor. Generally, the height-to-diameter ratio is designed to be 1.2-1.5 to adapt to the limitation of the transmission shaft in the mechanical top stirring or side stirring form and the limitation of the hydraulic stirring capacity. The 360BSTR anaerobic reactor of the present invention adopts a negative pressure suction plug flow mixing device and a suction jet circulation mixing and stirring strengthening system. The "horizontal plug flow mixing" and "vertical jet mixing" functions formed by the combined system avoid the requirements of the traditional mechanical stirring for the height-to-diameter ratio, and the height-to-diameter ratio can reach 3-8. Under such design conditions, not only the mixed mass transfer effect in the anaerobic reactor is not affected, but also the treatment effect of the reactor is not affected, and the fully mixed anaerobic reactor can be developed to the high altitude to achieve the purpose of saving floor space and reducing investment costs.

[0044] The guide jet pipe 3 generates local negative pressure by running the fast stirring plug flow mixer 5 installed by the shell sealing structure 4, sucking the top scum layer 11 in the reactor shell 1 to the guide jet pipe 3, and ejected from the injection direction set by the guide jet pipe 3 by the fast stirring plug flow mixer 5; the top scum layer 11 is located at a position flush with the liquid level height 10 in the tank; the scum layer 11 is formed by the scum layer and the crust layer in the reactor. It is often a gradual process. If the scum floating on the top of the tank body is not processed in time, it will gradually accumulate, thereby forming a thick, crusted scum layer, which not only seriously affects the normal operation of the reactor, but also the treatment effect of the anaerobic reactor. The present invention uses two means to treat the top scum: the scum negative pressure suction formed by the fast stirring plug flow mixer 5 and the suction of the top scum by the circulating slurry pump 29, which avoids the continuous accumulation of the top scum, so the present invention will not have the top scum crust phenomenon that occurs in other types of anaerobic reactors.

[0045] The scum layer 11 on the top of the pumping reactor shell 1 is collected by the pumping mixed liquid collecting pipe 21 and sent to the pumping mixed liquid downcomer 22, driven by the circulating slurry pump 29 into the water distribution pipe 30, and sprayed out by the pumping mixed jet mixing nozzles 24 vertically and evenly arranged on the pumping mixed liquid jet water distribution pipe 23.

[0046] The spraying direction of the suction mixing jet mixing nozzle 24 is consistent with the material flow direction induced by the fast stirring plug mixer 5, and is different according to the size of the tank diameter.

[0047] The injection direction of the guide injection pipe 3 forms an angle of 15-30° with the inner bottom plate of the reactor shell 1, and the ejected material forms a horizontal mixing propulsion flow 27 along the transverse direction of the tank and a vertical upward flow 8 of the ejected material.

[0048] The material mixture jet injection direction 25 induced by the extraction mixing jet mixing nozzle 24 is consistent with the material flow direction of the guide injection pipe 3, thereby enhancing the fluidity of the horizontal mixing propulsion flow 27 along the lateral direction of the tank and the vertical upward flow 8 of the injection material.

[0049] Among them, a first-level mixed liquid jet nozzle 241 of reduced diameter type is arranged at the position of the water distribution pipe opening 249 which connects the extraction mixing jet mixing nozzle 24 with the extraction mixing liquid jet water distribution pipe 23, and a second-level mixed liquid jet nozzle 248 of reduced diameter type is arranged at the end of the extraction mixing jet mixing nozzle 24, and an external material suction port 243 is arranged on the side of the mixing chamber 242 between the first-level mixed liquid jet nozzle 241 and the second-level mixed liquid jet nozzle 248.

[0050] Among them, the sludge, mud and water mixture entering from the extraction mixed liquid jet distribution pipe 23 is ejected outward from the first-level mixed liquid jet nozzle 241 through the mixing chamber 242 in the mixed liquid jet direction 244 to form a negative pressure in the mixing chamber 242, and the external material of the extraction mixed jet mixing nozzle 24 flows in the external material fluid direction 245 through the external material suction port 243 and is sucked in along the mixed liquid fluid direction 210, mixed with the material ejected from the first-level nozzle and moves along the material suction liquid mixed injection direction 246 to the second-level mixed liquid jet nozzle 248 and is ejected along the mixed material dispersion flow direction 247; wherein, the scum layer 11 on the top of the tank body forms a scum flow direction 13 opposite to the horizontal mixing propulsion flow 27 along the transverse direction of the tank.

[0051] Among them, a double-membrane biogas pressure-stabilizing storage cabinet with a pressure-stabilizing air cavity 16 is provided on the top of the reactor shell 1. The double-membrane biogas pressure-stabilizing storage cabinet includes an outer membrane 17 and an inner membrane 15. A biogas space 14 is provided in the inner membrane 15. The biogas space 14 is where the biogas generated by the BSTR anaerobic reactor is collected at the top of the reactor. A double-membrane biogas pressure-stabilizing cabinet device for biogas pressure stabilization and storage is installed on the top. The inner membrane 15 is used to isolate the biogas generated by the BSTR anaerobic reactor and the outer membrane pressure-regulated air. The outer membrane 17 is used to form a pressure-regulating chamber, so that the inner membrane air is output at a constant pressure and protects the inner membrane. The edges of the outer membrane and the inner membrane are connected to the fermentation tank port. As the outer shell of the gas cabinet, the inner membrane is protected to keep the biogas pressure in the BSTR anaerobic reactor constant.

[0052] The upper side of the reactor shell 1 is provided with a discharge port 19 with a water seal.

[0053] Among them, a bottom grit trough 33 is arranged at the center of the bottom of the reactor shell 1, and the bottom grit trough 33 is externally connected to a vent pipe 31; for organic waste with a high solid content, there is often a certain amount of inorganic mud and sand in the mixed material, and these mud and sand will often be deposited at the bottom of the anaerobic reactor. If they are not discharged regularly, they will gradually accumulate over a long period of time, reducing the effective space of the anaerobic reactor and affecting the treatment efficiency of the anaerobic reactor. The hydraulic dynamic analysis results of the BSTR anaerobic reactor of the present invention show that the muddy water in the material will be deposited at the bottom center of the BSTR anaerobic reactor. For this reason, we conventionally set a grit trough with a diameter of 1 to 2 meters at the center of the bottom of the BSTR, and set a vortex mud and sand discharge pipe at the bottom of the grit trough for regular sand discharge. Depending on the sand content in the material, the discharge cycle is once every 1 to 4 weeks;

[0054] Among them, the bottom sand settling tank 33 is located in the area of ​​about 1 to 2 meters in diameter at the bottom center of the BSTR anaerobic reactor, and is used to collect inorganic mud and sand separated after anaerobic degradation. In most materials with high organic concentration, the inorganic mud and sand contained in the materials are difficult to separate due to the high viscosity of the materials, but when the organic matter is anaerobically treated, the inorganic mud and sand in the materials will be separated from the materials and gradually deposited at the bottom of the anaerobic reactor. The fully mixed anaerobic reactor adopts different stirring and mixing forms, and the location of mud and sand deposition is also different. Under the hydraulic conditions of the BSTR anaerobic reactor of the present invention, the sand settling position is the central position of the bottom of the reactor.

[0055] Among them, a suction port top baffle 101 is arranged on one side of the top of the top material negative pressure suction descending guide pipe 6 in the reactor shell 1, and its designed bottom is located 0.5 meters below the liquid surface and 0.3 meters above the liquid surface to improve the effect of suction port on scum suction.

[0056] There are two anti-vortex baffles 102 disposed on the inner wall of the reactor shell 1 to prevent vortex flow from forming in the anaerobic reactor.

[0057] Wherein, a liquid temperature sensor 28 is installed on the mixed liquid extraction downcomer 22 .

[0058] An ultrasonic level meter 18 is installed in the pressure-stabilizing air cavity 16 to measure the lifting height of the inner membrane and prevent the inner membrane from being reversely sucked into the BSTR anaerobic reactor under low-pressure conditions.

[0059] like Figure 2-4 As shown, further understand the working principle and structure of 360BSTR anaerobic reactor;

[0060] The scum suction jet mixing and stirring intensification system is a significant feature of BSTR that is different from other technologies. The results of fluid mechanics simulation of the flow-guiding injection system using only a rapid stirring mixing propeller show that the stirring performance of the mixed material brought by the material ejected from the bottom quickly decays in the horizontal and vertical directions. If there are no auxiliary strengthening measures, the mixing intensity and scum suction intensity in the anaerobic reactor are relatively weak, and it is difficult to meet the stirring and mixing intensity requirements of the fully mixed anaerobic reactor for the materials. The 360BSTR anaerobic reactor of the present invention introduces jet mixing into the design of the anaerobic reactor, and strengthens the material mixing, stirring, plug flow, scum suction, material circulation, etc. in the anaerobic reactor, making the 360BSTR a truly all-round mixed and stirred anaerobic reactor.

[0061] Beneficial effects:

[0062] The invention - 360BSTR combines the experience of anaerobic treatment of high-inherent organic wastewater at home and abroad, and innovates in improving the mixing and stirring effect of the fully mixed anaerobic reactor, solving the top scum problem of the conventional CSTR anaerobic reactor, and the anaerobic process operation mode; this new intermittent all-round mixed anaerobic reactor has the following innovations and advantages:

[0063] 1. It has all-round mixing, stirring and homogenizing effects: the scum is sucked to the bottom of the reactor by a fast-rotating mechanical flow propeller and sprayed in a certain direction, forming a "horizontal mixing lateral flow" at the bottom of the reactor to prevent the sedimentation of sludge and mud sand at the bottom; the designed scum suction jet mixing and stirring strengthening system solves the problem that the stirring performance of the upper part of the reactor is quickly attenuated in the horizontal and vertical directions due to the spraying of materials at the bottom. By setting up the scum suction jet mixing and stirring strengthening system, it not only enhances the destruction and suction capacity of the top scum, but also maintains a high-intensity "horizontal mixing lateral flow" in the upper part of the reactor, ensuring the mixing, mass transfer and stirring performance of the materials outside the tank. At the same time, under the action of the two-stage scum suction, a "circular mixing vertical flow" from top to bottom and then from bottom to top is formed in the BSTR tank, which greatly improves the mixing and homogenizing effect of the reactor, thereby greatly improving the stability and processing capacity of the reactor.

[0064] 2. It effectively solves the problem of scum crusting on the top of conventional anaerobic reactors; the secondary scum suction circulation system is the biggest advantage of this new reactor.

[0065] 3. Introducing the jet mixing device into the fully mixed anaerobic reactor to enhance the material mixing degree and slag suction capacity in the anaerobic reactor is the most important design for the new anaerobic reactor to achieve all-round mixing and stirring.

[0066] 4. The process operation mode of intermittent feeding, intermittent suction circulation mixing and stirring, and intermittent discharging can save operating costs to a certain extent, improve the stability of anaerobic system treatment, and does not affect the anaerobic treatment efficiency of the treated materials compared to the continuous mixing and stirring anaerobic reactor (CSTR) commonly used in engineering applications.

[0067] 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 intermittent all-round mixing anaerobic reactor, characterized in that: The invention comprises a reactor shell (1), a flow guide and injection pipe (3) arranged at one side of the bottom of the reactor shell (1) and fixedly mounted by a bracket (2), a top material negative pressure suction and descending flow guide pipe (6) connected to the top of the flow guide and injection pipe (3) and arranged vertically close to the inner wall and fixed by a support frame (9), a material feed port (12) arranged at the side of the reactor shell (1) and having an inner bottom end corresponding to the top opening of the top material negative pressure suction and descending flow guide pipe (6), and a material feed port (12) arranged vertically at the other inner wall of the reactor shell (1) and connected to the bottom support (32) and the fixed support frame (9). A pumping mixed liquid jet water distribution pipe (23) fixedly mounted on a fixed bracket (26), a pumping mixed liquid collecting pipe (21) transversely arranged at the upper inner part of the reactor shell (1) through a collecting pipe bracket (211) and having pumping ports (20) uniformly distributed on the surface, a water distribution pipe (30) externally connected to the bottom of the pumping mixed liquid jet water distribution pipe (23), a pumping mixed liquid downcomer (22) connected to the outer end of the pumping mixed liquid collecting pipe (21) and vertically arranged, and a circulating slurry pump (29) installed between the pumping mixed liquid downcomer (22) and the water distribution pipe (30); The guide injection pipe (3) generates local negative pressure by operating a fast stirring plug flow mixer (5) installed in cooperation with the shell sealing structure (4), so that the top scum layer (11) in the reactor shell (1) is sucked into the guide injection pipe (3), and then the fast stirring plug flow mixer (5) sprays it out from the injection direction set by the guide injection pipe (3); The scum layer (11) on the top of the pumping reactor shell (1) is collected by the pumping mixed liquid collecting pipe (21) and sent to the pumping mixed liquid downcomer (22) to be driven by the circulating slurry pump (29) into the water distribution pipe (30) and sprayed out by the pumping mixed liquid jet mixing nozzles (24) vertically and evenly arranged on the pumping mixed liquid jet water distribution pipe (23); The injection direction of the guide injection pipe (3) forms an angle of 15-30° with the inner bottom plate of the reactor shell (1), and the ejected material forms a horizontal mixing propulsion flow (27) along the lateral direction of the tank and a vertical upward flow (8) of the ejected material; A first-stage mixed liquid jet nozzle (241) of a reduced diameter type is provided at the position of the water distribution pipe opening (249) connecting the pumping mixed liquid jet mixing nozzle (24) and the pumping mixed liquid jet water distribution pipe (23); the end of the pumping mixed liquid jet mixing nozzle (24) is a second-stage mixed liquid jet nozzle (248) of a reduced diameter type; and an external material suction port (243) is provided at the side of the mixing chamber (242) between the first-stage mixed liquid jet nozzle (241) and the second-stage mixed liquid jet nozzle (248); The sludge and mud-water mixture entering from the pumping mixed liquid jet water distribution pipe (23) is ejected outward from the primary mixed liquid jet nozzle (241) through the mixing chamber (242) in the mixed liquid jet direction (244), so that the mixing chamber (242) forms a negative pressure. The external material of the pumping mixed jet mixing nozzle (24) is sucked in through the external material suction port (243) along the direction (210) of the sucked mixed liquid fluid, mixed with the material ejected from the primary nozzle, and travels along the material suction liquid mixed spray direction (246) to the secondary mixed liquid jet nozzle (248) and ejected along the mixed material dispersion flow direction (247); A double-membrane biogas pressure-stabilizing storage cabinet with a pressure-stabilizing air cavity (16) is provided on the top of the reactor shell (1), the double-membrane biogas pressure-stabilizing storage cabinet comprising an outer membrane (17) and an inner membrane (15), and a biogas space (14) is provided inside the inner membrane (15); The upper side of the reactor shell (1) is provided with a discharge port (19) with a water seal; the bottom center of the reactor shell (1) is provided with a bottom sand settling tank (33), and the bottom sand settling tank (33) is externally connected to a vent pipe (31); A suction port top baffle (101) is provided on one side of the top of the negative pressure suction descending guide pipe (6) for top materials in the reactor shell (1); An anti-vortex baffle (102) is provided on the inner side wall of the reactor shell (1).

2. An intermittent all-round mixing anaerobic reactor according to claim 1, characterized in that: A liquid temperature sensor (28) is installed on the pumped mixed liquid downcomer (22).

3. The intermittent all-round mixing anaerobic reactor according to claim 1, characterized in that: An ultrasonic level meter (18) is installed in the pressure-stabilizing air cavity (16).

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