IC Anaerobic Reactor Staged Reaction System

Abstract

The present invention discloses an IC anaerobic reactor staged reaction system, comprising a tank body and a gas-liquid separator. A gas collection device is provided at the upper portion of the tank body, connected to the gas-liquid separator. The tank body is divided into an upper reaction zone and a lower reaction zone by a partition plate. The gas collection device is located above the upper reaction zone, a lower acidified liquid riser is provided through the partition plate, and the upper end of the lower acidified liquid riser is blocked. An upper water distributor is provided at the periphery of the lower acidified liquid riser in the upper reaction zone. A lower water distributor connected to a water inlet device is provided at the bottom of the tank body in the lower reaction zone. The lower acidified liquid riser is connected to the upper water distributor via an upper water distributor. A return pipe is provided through the gas collection device, the upper end of the return pipe is connected to the gas-liquid separator, and the return pipe is connected to the upper water distributor and the lower water distributor, respectively. The present invention enables the classified cultivation of acid-producing anaerobic microorganisms and methane-producing anaerobic microorganisms in the IC anaerobic reactor. The reactor has a high volumetric load, a small equipment size, and low operating costs.

Description

Technical Field

[0001] The present invention relates to a wastewater treatment technology, in particular to an IC anaerobic reactor staged reaction system. Background Art

[0002] The IC anaerobic reactor is a high-efficiency multi-stage internal circulation reactor and a representative type of the third-generation anaerobic reactor. Due to its powerful internal circulation, good mass transfer effect, and large biomass, its volume load is much higher than that of ordinary UASB anaerobic reactors, generally about 3 times higher. It is currently an ideal anaerobic wastewater treatment equipment in wastewater treatment and has been widely used in wastewater treatment in industries such as beer, liquor, alcohol, wine, citric acid, papermaking, starch, chemical industry, and landfill leachate.

[0003] The IC anaerobic reactor is currently the most ideal anaerobic treatment equipment for wastewater treatment. Anaerobic biological treatment, also known as anaerobic digestion or anaerobic fermentation, refers to the process of decomposing organic matter and producing CH4 and CO2 under anaerobic conditions by the combined action of multiple anaerobic or facultative anaerobic microorganisms. The entire anaerobic digestion process is divided into three stages: 1. Hydrolysis and fermentation, 2. Hydrogen and acetic acid production, and 3. Methane production. Current IC anaerobic reactors cultivate and reproduce the acid-producing and methanogenic anaerobic microorganisms in these stages in the same reaction zone. This leads to mutual interference between the microorganisms in the wastewater, uneven contact between the microorganisms and the organic matter, and affects their growth and reproduction, thus compromising wastewater treatment. Current IC anaerobic reactors have not yet addressed this issue. And because water distribution is the core technology of IC anaerobic reactor, the uniformity of water distribution is directly related to the treatment effect of IC anaerobic reactor, especially for IC anaerobic reactor with larger tank diameter, it is difficult to ensure uniform water distribution, which is easy to produce dead zone of water distribution. As time goes on, sludge will accumulate, causing calcification and hardening of sludge, affecting the full contact between organic matter and microorganisms, and ultimately affecting the treatment effect. At present, the water distribution of IC anaerobic reactor mostly adopts IC reactor with larger diameter and multiple gas-liquid separators, such as 4 gas-liquid separators, each gas-liquid separator is equipped with a reflux system of a reflux pipe. The internal circulation reflux water flows back to the bottom of the reactor through each reflux pipe, and increases the hydraulic load together with the wastewater raw water, so that the organic matter and microorganisms have full contact, and the degradation effect of microorganisms on organic matter is improved. However, this makes the structure of IC anaerobic reactor too complicated, bulky, and requires large equipment investment. It is not convenient for production, transportation, installation and maintenance, and is not conducive to factory and industrial production. Therefore, with the continuous development of production, a series of technologies of IC anaerobic reactor need to be studied and improved. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an IC anaerobic reactor staged reaction system which can enable acidogenic anaerobic microorganisms and methanogenic anaerobic microorganisms in the IC anaerobic reactor to be classified and cultured, and has high reactor volume load, small equipment size, low operating cost and easy transportation.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: an IC anaerobic reactor staged reaction system, including a tank body and a gas-liquid separator, a gas collecting device is provided on the upper part of the tank body, and the gas collecting device is connected to the gas-liquid separator through a lifting pipe. The tank body is divided into an upper reaction zone and a lower reaction zone by a partition plate, the gas collecting device is located above the upper reaction zone, and a lower acidified liquid rising pipe is provided through the middle of the partition plate. The upper end of the lower acidified liquid rising pipe is blocked, an upper water distributor is provided on the outer periphery of the lower acidified liquid rising pipe in the upper reaction zone, and a lower water distributor connected to a water inlet device is provided at the bottom of the tank body in the lower reaction zone, and the lower acidified liquid rising pipe is connected to the upper water distributor through an upper water distributor; a return pipe is provided through the gas collecting device, and the upper end of the return pipe is connected to the gas-liquid separator, and the return pipe is respectively connected to the upper water distributor and the lower water distributor.

[0006] As an optimal technical solution, the return pipe includes an upper internal circulation return pipe, and a lower internal circulation return pipe is installed on the outside of the upper internal circulation return pipe. The upper end of the upper internal circulation return pipe extends out of the upper end of the lower internal circulation return pipe and is connected to the bottom of the gas-liquid separator. The lower end of the upper internal circulation return pipe is sealed, and a number of upper return water distribution pipes are arranged through the lower internal circulation return pipe. The inner end of the upper return water distribution pipe is connected to the lower end of the upper internal circulation return pipe and the outer end is connected to the upper water distributor.

[0007] As an optimal technical solution, the upper end of the lower internal circulation return pipe is sealedly connected to the outer wall of the upper internal circulation return pipe, the upper end of the lower internal circulation return pipe is connected to the gas-liquid separator through the lower internal reflux branch pipe, and the lower end of the lower internal circulation return pipe passes through the lower acidizing liquid riser to connect to the lower water distributor.

[0008] As an optimal technical solution, the upper water distributor includes an upper inner water distributor, and an upper outer water distributor is provided on the outer peripheral side of the upper inner water distributor. The upper water distribution pipe includes several upper inner water distribution pipes and upper outer water distribution pipes. The inner end of the upper inner water distribution pipe is connected to the lower acidizing liquid riser and the outer end is connected to the upper inner water distributor. The inner end of the upper outer water distribution pipe is connected to the lower acidizing liquid riser and the outer end is connected to the upper outer water distributor. The outer end of the upper reflux water distribution pipe is located between the upper inner water distributor and the upper outer water distributor.

[0009] As an optimal technical solution, the upper return water distribution pipe, the upper inner water distribution pipe and the upper outer water distribution pipe are respectively evenly distributed along the circumference, the outer end pipe openings of the upper return water distribution pipe are respectively provided with upper return water distribution nozzles, the outer end pipe openings of the upper inner water distribution pipe are respectively provided with upper inner water distribution nozzles, and the outer end pipe openings of the upper outer water distribution pipe are respectively provided with upper outer water distribution nozzles, the outlet directions of the upper return water distribution nozzles, the upper inner water distribution nozzles and the upper outer water distribution nozzles are respectively arranged in the tangential direction, and the outlet directions of the upper return water distribution nozzles, the upper inner water distribution nozzles and the upper outer water distribution nozzles are the same, and the upper return water distribution nozzles, the upper inner water distribution nozzles and the upper outer water distribution nozzles are respectively evenly distributed along the circumference.

[0010] As an optimal technical solution, the lower water distributor includes a lower inner return water distribution cylinder connected to the lower inner circulation return pipe, a sludge return cylinder is provided below the lower inner return water distribution cylinder, a lower inner water distributor is provided on the outer peripheral side of the sludge return cylinder, a lower outer water distributor is provided on the outer peripheral side of the lower inner water distributor, a plurality of lower inner return water distribution pipes are connected to the circumference of the lower inner return water distribution cylinder, and the outer end of the lower inner return water distribution pipe is located between the lower inner water distributor and the lower outer water distributor; a plurality of liquid inlet holes are provided on the circumferential direction of the upper cylinder wall of the sludge return cylinder, and a plurality of liquid outlet holes are provided on the circumferential direction of the lower cylinder wall of the sludge return cylinder.

[0011] As an optimal technical solution, the upper end pipe opening of the lower inner reflux branch pipe is connected to the gas-liquid separator, and the upper end pipe opening of the lower inner reflux branch pipe is higher than the upper end pipe opening of the upper inner circulation reflux pipe, the upper end pipe opening of the lower inner reflux branch pipe extends into the gas-liquid separator and is connected to a slag retaining pipe, the inner diameter of the slag retaining pipe is larger than the diameter of the upper end pipe opening of the lower inner reflux branch pipe, the upper end pipe opening of the slag retaining pipe is higher than the upper end pipe opening of the lower inner reflux branch pipe, and the lower end pipe opening of the slag retaining pipe is lower than the lower end pipe opening of the lower inner reflux branch pipe.

[0012] As a preferred technical solution, an annular upper casing is provided on the outer peripheral side of the upper end of the lower internal circulation return pipe, an upper casing cavity connected to the tube cavity of the lower internal circulation return pipe is provided in the upper casing, and the lower end pipe opening of the lower internal return branch pipe is connected to the upper casing cavity; an annular lower casing is provided on the lower internal circulation return pipe at the outer peripheral side of the lower end of the upper internal circulation return pipe, a lower casing cavity connected to the tube cavity of the lower internal circulation return pipe is provided in the lower casing, and the upper return water distribution pipe passes through the lower casing cavity.

[0013] As an optimal technical solution, the portion of the upper end of the upper internal circulation reflux pipe extending out of the lower internal circulation reflux pipe is provided with a control valve; the upper end of the lower acidizing liquid rising pipe is connected to an anti-gas blockage pipe, and the anti-gas blockage pipe is connected to the gas-liquid separator.

[0014] As a preferred technical solution, the gas collection device includes a gas collector and a three-phase separator arranged in sequence above the upper reaction zone, the lifting pipeline includes a first-level lifting pipe and a second-level lifting pipe, the gas collector is connected to the gas-liquid separator through the first-level lifting pipe, and the three-phase separator is connected to the gas-liquid separator through the second-level lifting pipe.

[0015] Due to the adoption of the above-mentioned technical solution, the IC anaerobic reactor staged reaction system, the IC anaerobic reactor staged reaction system, includes a tank body and a gas-liquid separator, a gas collecting device is provided on the upper part of the tank body, the gas collecting device is connected to the gas-liquid separator through a lifting pipe, the tank body is divided into an upper reaction zone and a lower reaction zone by a partition plate, the gas collecting device is located above the upper reaction zone, a lower acidified liquid rising pipe is provided through the middle of the partition plate, the upper end of the lower acidified liquid rising pipe is blocked, an upper water distributor is provided on the outer periphery of the lower acidified liquid rising pipe in the upper reaction zone, a lower water distributor connected to a water inlet device is provided at the bottom of the tank body in the lower reaction zone, the lower acidified liquid rising pipe is connected to the upper water distributor through an upper water distributor; a return pipe is provided through the gas collecting device, the upper end of the return pipe is connected to the gas-liquid separator, and the return pipe is respectively connected to the upper water distributor and the lower water distributor. The present invention divides the upflow sludge reaction part of the IC anaerobic reactor into two parts, the lower part being a lower reaction zone and the upper part being an upper reaction zone, and each part is provided with a water distributor, thereby realizing a double-layer sludge bed structure. The water distributor of each part is provided with an internal circulation reflux water reflux system, wherein the lower reaction zone is a hydrolysis and acidification stage, including a hydrolysis and fermentation stage and a hydrogen and acetic acid production stage, and the upper reaction zone is a methane production stage. The acidified liquid that has completed the reaction in the lower reaction zone rises through a lower acidified liquid riser and is distributed through the upper water distributor into the upper reaction zone, so that acidogenic anaerobic microorganisms and methane-producing anaerobic microorganisms are cultured in a classified manner, and the acidifying bacteria and methanogenic bacteria can grow and reproduce under the conditions that are most suitable for them. The hydrolysis and acidification stage in the lower reaction zone of the present invention functions to hydrolyze and acidify solid organic matter into organic acids, buffering and diluting load shock and harmful substances, and intercepting difficult-to-degrade solid matter. The methanogenesis stage in the upper reaction zone maintains strict anaerobic conditions and pH values to facilitate the growth of methanogens, degrade and stabilize organic matter, produce methane-containing digestion gas, and intercept suspended solids to ensure good effluent quality. The present invention uses a partition plate to divide the upflow sludge reaction section of the IC anaerobic reactor into upper and lower sections. The reflux from the internal circulation reflux system is divided into two paths, which are connected through a reflux pipe. One part returns to the hydrolysis and acidification stage in the lower section, while the other part enters the methanogenesis stage in the upper section, increasing the hydraulic load for water distribution, ensuring sufficient contact between organic matter and microorganisms in both sections, and improving treatment efficiency. The present invention has a high volumetric load, a small equipment size, a small footprint, low operating costs, easy transportation, and is suitable for factory-scale and large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 This invention Figure 1 AA direction schematic diagram;

[0019] Figure 3 This invention Figure 1 Schematic diagram of the middle BB direction.

[0020] In the figure: 1-tank body; 2-lower inner water distribution pipe; 3-lower outer water distribution pipe; 4-lower outer water distributor; 5-lower inner return water distribution pipe; 51-lower inner return water distribution nozzle; 6-lower inner water distributor; 7-sludge return cylinder; 8-liquid outlet; 9-lower inner circulation return pipe; 10-liquid inlet; 11-lower inner return water distribution cylinder; 12-partition plate; 13-upper outer water distributor; 14-upper outer water distribution pipe; 141-upper outer water distribution nozzle; 15-upper inner water distributor; 16-upper inner water distribution pipe; 161-upper inner water distribution nozzle; 17-lower acidizing liquid riser ;18-upper reflux water distribution pipe;181-upper reflux water distribution nozzle;19-lower casing;20-gas collector;21-lower inner water distribution nozzle;22-first-stage lifting pipe;23-three-phase separator;24-overflow trough;25-upper casing;26-second-stage lifting pipe;27-water distribution bag;28-upper inner circulation return pipe;29-control valve;30-lower inner reflux branch pipe;31-scum retaining pipe;311-lower outer water distribution nozzle;32-gas-liquid separator;33-biogas outlet;34-manhole;35-water outlet pipe;36-anti-gas blockage pipe. DETAILED DESCRIPTION

[0021] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that, in the accompanying drawings, the same reference numerals are given to components having substantially the same structure and function, and redundant descriptions of substantially the same components are omitted for the sake of clarity.

[0022] like Figure 1As shown, the IC anaerobic reactor staged reaction system includes a tank body 1 and a gas-liquid separator 32. The gas-liquid separator 32 is arranged on the upper side of the tank body 1. A gas collecting device is arranged on the upper part of the tank body 1. The gas collecting device is connected to the gas-liquid separator 32 through a lifting pipe. The tank body is divided into an upper reaction zone and a lower reaction zone by a partition plate 12. The gas collecting device is located above the upper reaction zone. A lower acidified liquid rising pipe 17 is arranged through the middle of the partition plate 12. The upper end of the lower acidified liquid rising pipe 17 is blocked. An upper water distributor is arranged on the outer periphery of the lower acidified liquid rising pipe 17 in the upper reaction zone. A lower water distributor connected to a water inlet device is provided at the bottom of the tank body 1 in the lower reaction zone. The lower acidified liquid rising pipe 17 is connected to the upper water distributor through an upper water distributor; a return pipe is arranged through the gas collecting device. The upper end of the return pipe is connected to the gas-liquid separator 32. The return pipe is connected to the upper water distributor and the lower water distributor respectively. The present invention divides the upflow sludge reaction section of the IC anaerobic reactor into upper and lower sections by means of a partition plate 12, wherein the lower section is a lower reaction zone and the upper section is an upper reaction zone. Each section is provided with a water distributor, thereby realizing a double-layer sludge bed structure. The water distributor of each section is provided with an internal circulation reflux water reflux system. The lower reaction zone is the hydrolysis and acidification stage, including the hydrolysis and fermentation stage and the hydrogen and acetic acid production stage, while the upper reaction zone is the methane production stage. The acidified liquid that has completed the reaction in the lower reaction zone rises through the lower acidified liquid riser 17 and enters the upper reaction zone through the upper water distributor, thereby enabling acidogenic anaerobic microorganisms and methanogenic anaerobic microorganisms to be cultured separately, and the acidifying bacteria and methanogenic bacteria can grow and reproduce under the conditions that are most suitable for each. In this way, the lower reaction zone and the upper reaction zone are separated by the partition plate 12, allowing them to operate independently, maintaining the reaction conditions in each reaction zone, and facilitating the growth and reproduction of microorganisms under the environmental conditions that are most suitable for them. The lower hydrolysis and acidification stage functions to hydrolyze and acidify solid organic matter into organic acids, buffer and dilute load shock and harmful substances, and intercept difficult-to-degrade solid matter. The upper methanogenesis stage functions to maintain strict anaerobic conditions and pH values to facilitate the growth of methanogens, degrade and stabilize organic matter, produce methane-containing digester gas, and intercept suspended solids to ensure good effluent quality. The top of the gas-liquid separator 32 is provided with a biogas outlet 33 and a manhole 34. Biogas enters the next process for treatment and utilization through the biogas outlet 33, and the manhole 34 is used for maintenance, etc. The top of the tank body 1 is provided with an overflow trough 24. Wastewater after reaction treatment enters the overflow trough 24 through a weir and is discharged through an outlet pipe 35 to the next process. The overflow trough 24 ensures uniform distribution of effluent from the IC anaerobic reactor, prevents short-circuiting and sludge leakage, and fully utilizes the reactor's internal space, improving volumetric load and treatment efficiency. The upper end of the lower acidizing liquid ascending pipe is connected to an anti-gas blockage pipe 36 , and the anti-gas blockage pipe 36 is connected to the gas-liquid separator 32 to prevent gas blockage.

[0023] like Figure 1 and Figure 3As shown, the reflux pipe includes an upper internal circulation reflux pipe 28, the outer side of which is sheathed with a lower internal circulation reflux pipe 9, the upper end of which extends out of the upper end of the lower internal circulation reflux pipe 9 and connects to the bottom of the gas-liquid separator 32, the lower end of which is blocked, and a plurality of upper reflux water distribution pipes 18 are provided through the lower internal circulation reflux pipe 9, the inner end of which is connected to the lower end of the upper internal circulation reflux pipe 28 and the outer end is connected to the upper water distributor. The water and sludge separated by the gas-liquid separator 32 are refluxed to the upper reaction zone through the upper internal circulation reflux pipe 28 and cooperate with the upper water distributor, thereby increasing the hydraulic load, making the stirring more uniform, and improving the mass transfer effect between organic matter and microorganisms. The upper end of the lower internal circulation return pipe 9 is sealedly connected to the outer wall of the upper internal circulation return pipe 28, the upper end of the lower internal circulation return pipe 9 is connected to the gas-liquid separator 32 through the lower internal reflux branch pipe 30, and the lower end of the lower internal circulation return pipe 9 passes through the lower acidizing liquid riser 17 and is connected to the lower water distributor. The upper water distributor includes an upper inner water distributor 15, and an upper outer water distributor 13 is provided on the outer peripheral side of the upper inner water distributor 15. The upper water distribution pipe includes a plurality of upper inner water distribution pipes 16 and an upper outer water distribution pipe 14. The inner end of the upper inner water distribution pipe 16 is connected to the lower acidified liquid riser 17 and the outer end is connected to the upper inner water distributor 15. The inner end of the upper outer water distribution pipe 14 is connected to the lower acidified liquid riser 17 and the outer end is connected to the upper outer water distributor 13. The outer end of the upper reflux water distribution pipe 18 is located between the upper inner water distributor 15 and the upper outer water distributor 13. In this way, the internal circulation reflux water is mixed with the acidified liquid from the hydrolysis and acidification stage of the lower reaction zone, which increases the hydraulic load, makes the stirring more uniform, improves the contact between organic matter and microorganisms, has a good mass transfer effect, and prevents sludge deposition. The upper return water distribution pipe 18, the upper inner water distribution pipe 16 and the upper outer water distribution pipe 14 are respectively evenly distributed along the circumference. According to the actual production operation requirements, the number of the upper return water distribution pipe 18, the upper inner water distribution pipe 16 and the upper outer water distribution pipe 14 can be 3, 4, 5, 6, 7, 8 or other numbers. The preferred upper return water distribution pipe 18 of the present invention is 6, the upper inner water distribution pipe 16 is 4, the upper outer water distribution pipe 14 is 6, the outer end of the upper return water distribution pipe 18 is respectively provided with an upper return water distribution nozzle 181 ...4 is 6, the upper return water distribution pipe 18 is respectively provided with an upper return water distribution nozzle 181, the upper inner water distribution pipe 16 is 4, the upper inner water distribution The outer end of the water pipe 16 is respectively provided with an upper inner water distribution nozzle 161, and the outer end of the upper outer water distribution pipe 14 is respectively provided with an upper outer water distribution nozzle 141. The outlet directions of the upper return water distribution nozzle 181, the upper inner water distribution nozzle 161 and the upper outer water distribution nozzle 141 are respectively arranged in the tangential direction, and the outlet directions of the upper return water distribution nozzle 181, the upper inner water distribution nozzle 161 and the upper outer water distribution nozzle 141 are the same, and the upper return water distribution nozzle 181, the upper inner water distribution nozzle 161 and the upper outer water distribution nozzle 141 are respectively evenly distributed along the circumference.In this way, the upper outer water distributor 13 and the upper outer water distribution pipe 14 stir and rotate the surrounding mixed liquid to prevent sludge sedimentation, accumulation and calcification, thereby improving the mass transfer effect between organic matter and microorganisms; the upper inner water distributor 15 and the upper inner water distribution pipe 16 stir and rotate the central mixed liquid to prevent sludge sedimentation and calcification in the center, thereby improving the mass transfer effect between organic matter and microorganisms.

[0024] like Figure 1 and Figure 2As shown, the lower water distributor includes a lower inner return water distribution cylinder 11 connected to the lower inner circulation return pipe 9. A sludge return hole cylinder 7 is provided below the lower inner return water distribution cylinder 11. The outer periphery of the sludge return cylinder 7 is provided with a lower inner water distributor 6. The outer periphery of the lower inner water distributor 6 is provided with a lower outer water distributor 4. Several lower inner return water distribution pipes 5 are connected to the circumference of the lower inner return water distribution cylinder 11, and the outer ends of the lower inner return water distribution pipes 5 are located between the lower inner water distributor 6 and the lower outer water distributor 4. Several liquid inlet holes 10 are circumferentially provided on the upper wall of the sludge return cylinder 7, and several liquid outlet holes 8 are circumferentially provided on the lower wall of the sludge return cylinder 7. The lower inner return water distribution cylinder 11 and the sludge return cylinder 7 can be integrally provided, and the cylinders can be separated by a partition plate, resulting in a simple and practical structure. The water inlet device can be a water distribution bag 27 provided on both sides of the tank body 1, and each water distribution bag 27 is respectively connected to a number of lower inner water distribution pipes 2 and lower outer water distribution pipes 3; the inner end of the lower inner water distribution pipe 2 passes through the side wall of the tank body 1 to connect to the lower inner water distributor 6, and the inner end of the lower outer water distribution pipe 3 passes through the side wall of the tank body 1 to connect to the lower outer water distributor 4; the lower outer water distributor 4 and the lower outer water distribution pipe 3 stir and rotate the mixed liquid around the lower water distributor, effectively preventing sludge from depositing around the bottom of the tank body 1; the lower inner water distributor 6 and the lower inner water distribution pipe 2 stir and rotate the mixed liquid in the center, effectively preventing sludge from depositing in the center of the bottom of the tank body 1. The lower inner reflux water diversion cylinder 11 connects the inner circulation reflux water of the lower inner circulation reflux pipe 9 to the lower inner water distributor 6 and the lower outer water distributor 4 through the lower inner reflux water distribution pipe 5, and mixes it with the inlet water input by the water diversion bag 27 through the lower outer water distribution pipe 3 and the lower inner water distribution pipe 2, thereby reducing the concentration of the wastewater raw water inlet and increasing the hydraulic load, improving the contact between organic matter and microorganisms, and preventing sludge deposition. The inlet water input by the water diversion bag 27 through the lower inner water distribution pipe 2 will produce a centrifugal effect at the lower inner water distributor 6, forming a vortex around the sludge return cylinder 7. The mixed liquid in the sludge return cylinder 7 is circulated by gravity, so that the mixed liquid of organic matter and microorganisms already mixed at the bottom enters the sludge return cylinder 7 from the liquid inlet hole 10, is discharged from the liquid outlet hole 8 and then further mixed at the bottom, so that the contact between the two is more sufficient, which can effectively improve the treatment effect. The number of the liquid outlet holes 8 and the liquid inlet holes 10 can be 4, and of course, can be set to 3, 5, 6, 7, etc. according to the actual production operation requirements. During production, after the wastewater raw water is fully mixed with the external circulation return water of the IC anaerobic reactor, it is divided into two routes and enters the two water distribution bags 27 respectively. According to the actual production water inlet operation requirements, the number of the lower inner return water distribution pipes 5, the lower inner water distribution pipes 2 and the lower outer water distribution pipes 3 can be 3, 4, 5, 6, 7, 8 or other numbers respectively. The preferred number of the lower inner return water distribution pipes 5, the lower inner water distribution pipes 2 and the lower outer water distribution pipes 3 in the present invention is 6, the lower inner water distribution pipes 2 are 4, and the lower outer water distribution pipes 3 are 6. Each of the water distribution bags 27 is connected to 2 lower inner water distribution pipes 2 and 3 lower outer water distribution pipes 3, respectively, to avoid dead zones in water distribution.The outer end pipe mouths of the lower inner return water distribution pipe 5 are respectively provided with lower inner return water distribution nozzles, the inner end pipe mouths of the lower inner water distribution pipe 2 are respectively provided with lower inner water distribution nozzles 21, and the inner end pipe mouths of the lower outer water distribution pipe 3 are respectively provided with lower outer water distribution nozzles 311. The outlet directions of the lower inner return water distribution nozzles, the lower inner water distribution nozzles 21 and the lower outer water distribution nozzles 311 are respectively arranged in the tangential direction, and the outlet directions of the lower inner return water distribution nozzles, the lower inner water distribution nozzles 21 and the lower outer water distribution nozzles 311 are the same; the lower inner return water distribution pipe 5, the lower inner water distribution pipe 2 and the lower outer water distribution pipe 3 are respectively evenly distributed along the circumference, and the lower return water distribution nozzles, the lower inner water distribution nozzles 21 and the lower outer water distribution nozzles 311 are respectively evenly distributed along the circumference.

[0025] like Figure 1 As shown, the upper end of the lower inner reflux branch pipe 30 is connected to the gas-liquid separator 32, and the upper end of the lower inner reflux branch pipe 30 is higher than the upper end of the upper inner circulation reflux pipe 28. The upper end of the lower inner reflux branch pipe 30 extends into the gas-liquid separator 32 and is connected to a slag retaining pipe 31. The inner diameter of the slag retaining pipe 31 is larger than the diameter of the upper end of the lower inner reflux branch pipe 30. The upper end of the slag retaining pipe 31 is higher than the upper end of the lower inner reflux branch pipe 30 and the lower end of the slag retaining pipe 31 is lower than the lower end of the lower inner reflux branch pipe 30. The upper end of the lower internal reflux branch pipe 30 is higher than the upper end of the upper internal circulation reflux pipe 28, and is connected to a slag blocking pipe 31, which prevents sludge from entering the lower internal reflux branch pipe 30 and prevents the methane-producing sludge from flowing back to the hydrolysis and acidification stage of the lower reaction zone. Due to the need for reflux in the lower reaction zone and the upper reaction zone, the reflux pipe adopts an inner and outer double-layer method in which the upper inner circulation reflux pipe 28 is sleeved in the lower inner circulation reflux pipe 9. In order to adapt to production needs, the bottom of the gas-liquid separator 32 can be set into an inverted cone shape, and the upper inner circulation reflux pipe 28 is connected to the bottom of the inverted cone of the gas-liquid separator 32, and its pipe top is level with the cone bottom. The upper end pipe mouth of the lower inner reflux branch pipe 30 is higher than the cone top of the inverted cone of the gas-liquid separator 32. For example, the upper end pipe mouth of the lower inner reflux branch pipe 30 can be 500-800mm higher than the cone top of the inverted cone of the gas-liquid separator 32, the lower end pipe mouth of the slag retaining pipe 31 is 300mm lower than the lower end pipe mouth of the lower inner reflux branch pipe 30, and the upper end pipe mouth of the slag retaining pipe 31 is 200mm higher than the upper end pipe mouth of the lower inner reflux branch pipe 30, so as to prevent sludge from entering and flowing back to the hydrolysis and acidification stage.

[0026] like Figure 1As shown, an annular upper casing 25 is provided on the outer peripheral side of the upper end of the lower internal circulation return pipe 9, and an upper casing 25 cavity is provided in the upper casing 25 which is connected to the tube cavity of the lower internal circulation return pipe 9, and the lower end pipe opening of the lower internal return branch pipe 30 is connected to the upper casing cavity; an annular lower casing 19 is provided on the outer peripheral side of the lower end of the upper internal circulation return pipe 28 on the lower internal circulation return pipe 9, and a lower casing cavity is provided in the lower casing 19 which is connected to the tube cavity of the lower internal circulation return pipe 9, and the upper return water distribution pipe 18 passes through the lower casing cavity. Through the upper sleeve 25 and the upper sleeve cavity, the lower internal reflux branch pipe 30 is directly connected to the upper sleeve cavity, which increases the inlet space of each lower internal reflux branch pipe 30, reduces the water inlet resistance, and ensures that the amount of internal circulation reflux water in the lower reaction zone can be regulated according to operation needs; at the same time, since the upper internal circulation reflux pipe 28 for the reflux upper reaction zone is nested in the lower internal circulation reflux pipe 9, the upper reflux water distribution pipe 18 must pass through the interlayer between the upper internal circulation reflux pipe 28 and the lower internal circulation reflux pipe 9, which will occupy the reflux space of the lower internal circulation reflux pipe 9 for the reflux lower reaction zone. Through the lower sleeve 19 and the lower sleeve cavity, the water cross-sectional area of the lower internal circulation reflux pipe 9 in the area where the upper reflux water distribution pipe 18 passes through will not become smaller, ensuring that the amount of internal circulation reflux water in the lower reaction zone can be regulated according to operation needs.

[0027] like Figure 1As shown, the portion of the upper end of the upper internal circulation return pipe 28 extending out of the lower internal circulation return pipe is provided with a control valve 29. The control valve 29 can be a butterfly valve, which will directly affect the treatment effect of the IC anaerobic reactor, because the IC anaerobic reactor treats high-concentration organic wastewater, and the internal circulation return water is several to twenty times the inflow volume of the wastewater raw water. The internal circulation return water volume directly affects the hydraulic retention time and hydraulic load of the wastewater raw water. If the internal circulation return water volume is small, the water flow load is also small, the sludge cannot be stirred, and the organic matter in the wastewater cannot fully contact and react with the microorganisms. At the same time, if the internal circulation return water volume is small, the water flow retention time of the wastewater raw water is long, and biogas will be produced before the methanogenesis stage, which reduces the growth of acidifying bacteria. The growth and reproduction conditions of methanogens cannot be achieved, and the acidifying bacteria cannot grow and reproduce under the conditions that are most suitable for them. The internal circulation reflux water volume is large, and the water flow load is also large. The hydraulic retention time of the wastewater raw water is short. The wastewater enters the methanogenesis stage in the upper reaction zone without being fully reacted in the hydrolysis and acidification stage in the lower reaction zone, which will reduce the growth and reproduction conditions of methanogens and cannot enable methanogens to grow and reproduce under the conditions that are most suitable for them. Therefore, the internal circulation reflux water volume of the lower reaction zone and the upper reaction zone is adjusted by the control valve 29 to effectively control the hydraulic retention time and hydraulic load of the wastewater raw water in the hydrolysis and acidification stage, which will improve the treatment effect of the IC anaerobic reactor. During operation, when the control valve 29 is closed, the amount of internal circulation return water in the lower reaction zone increases, and when the control valve 29 is opened, the amount of internal circulation return water in the lower reaction zone decreases. When the control valve 29 is fully opened, the water inflow into the lower internal return branch 30 is very small or even non-existent. When the control valve 29 is closed, the water inflow into the lower internal return branch 30 increases. The water flow rates of the lower internal circulation return pipe 9 and the upper internal circulation return pipe 28 should each be able to accommodate the total amount of internal circulation return water, ensuring sufficient adjustment range. Therefore, the residence time of the wastewater raw water and the hydraulic load in the lower reaction zone can be adjusted by adjusting the control valve 29, ensuring that the acidification effect is achieved in the lower reaction zone without generating biogas, creating a suitable living and breeding environment for acidifying bacteria. The inner diameter of the portion of the lower internal circulation return pipe 9 located below the upper internal circulation return pipe 28 is smaller than the inner diameter of the portion of the lower internal circulation return pipe 9 located on the outer peripheral side of the upper internal circulation return pipe 28. In this way, the diameter of the portion of the lower internal circulation return pipe 9 passing through the lower acidizing liquid rising pipe 17 will become smaller, thereby ensuring the normal water flow rate of the lower acidizing liquid rising pipe 17.

[0028] like Figure 1As shown, the gas collection device includes a gas collector 20 and a three-phase separator 23 arranged in sequence above the upper reaction zone, and the lifting pipeline includes a primary lifting pipe 22 and a secondary lifting pipe 26. The gas collector 20 is connected to the gas-liquid separator 32 via the primary lifting pipe 22, and the three-phase separator 23 is connected to the gas-liquid separator 32 via the secondary lifting pipe 26. The biogas produced in the upper reaction zone is collected by the gas collector 20, and the biogas mixture is lifted to the top gas-liquid separator 32 via the primary lifting pipe 22 for gas-liquid separation. The separated biogas is processed and used as energy, and the separated water is returned to the lower and upper reaction zones via the lower internal circulation return pipe 9 and the upper internal circulation return pipe 28 to increase the water load. It plays a stirring role. At the same time, since only about 60-90% of the biogas can be collected in the gas collector 20, 10-40% of the biogas is collected for a second time by the three-phase separator 23. The biogas collected for the second time by the three-phase separator 23 is raised to the gas-liquid separator 32 through the secondary riser 26 and is separated together with the biogas collected by the gas collector 20. The gas collector 20, the three-phase separator 23 and the gas-liquid separator 32 in the present invention are all well-known conventional equipment, and their specific structures are not described here.

[0029] The structure of the present invention is that the IC anaerobic reactor with a larger diameter still adopts a gas-liquid separator 32, is equipped with a return pipe, and two water distributors, an upper water distributor and a lower water distributor. The lower water distributor at the bottom of the IC anaerobic reactor is additionally provided with a water distribution cylinder and a sludge return cylinder 7, so that the water distribution is more uniform, the contact between microorganisms and organic matter is more sufficient, the treatment effect is improved, and the equipment investment is reduced.

[0030] The working principle of the present invention is:

[0031] The IC anaerobic reactor staged reaction system of the present invention divides the hydrolysis and fermentation stage, hydrogen and acetic acid production stage, and methane production stage of the anaerobic biological treatment into two upper and lower reaction zones in the IC anaerobic reactor. The lower reaction zone is the hydrolysis and acidification stage, including the hydrolysis and fermentation stage and the hydrogen and acetic acid production stage, while the upper reaction zone is the methane production stage. During operation, the wastewater first enters the lower reaction zone, where anaerobic and facultative anaerobic microorganisms decompose complex organic matter into simple organic matter. Under the action of acidogenic anaerobic bacteria, these simple organic matter is converted into volatile fatty acids and alcohols through anaerobic fermentation and oxidation, and the volatile fatty acids and alcohols are converted into acetic acid, hydrogen, CO2, etc. After the wastewater completes the reaction process in the lower reaction zone, the acidified liquid enters the methane production stage of the upper reaction zone through the lower acidified liquid riser 17, the upper water distribution pipe, and the upper water distributor. The methanogens convert the acetic acid, hydrogen, and CO2 in the acidified liquid that has completed the reaction in the lower reaction zone into methane. In order to ensure the smooth completion of the process, enhance the impact of organic load and harmful substances, and improve the processing capacity, the lower reaction zone and the upper reaction zone of the present invention are both provided with a lower water distributor and an upper water distributor of the water distribution system. The water distribution system has two water supply routes, one of which is the wastewater raw water from the regulating tank lifting pump through the water inlet device, and the other is the reflux water separated by the gas-liquid separator 32. The reflux water is divided into two routes, one of which is refluxed to the hydrolysis and acidification stage of the lower reaction zone, and the other is refluxed to the methane production stage of the upper reaction zone. The reflux water is produced by separating water and biogas after the biogas mixture enters the gas-liquid separator 32 through the lifting pipe. Under normal circumstances, the higher the biogas production, the greater the reflux water volume. The internal circulation reflux water volume can generally reach 3-5 times the wastewater raw water inlet volume, and even up to 20 times. Due to the large hydraulic load, the sludge and organic matter in the wastewater can be fully mixed, and the sludge can be in a fully expanded state, which can enhance mass transfer and greatly improve the anaerobic digestion rate and volumetric load of the IC reactor.

[0032] The present invention can adjust the reflux water volume of the hydrolysis and acidification stage in the lower reaction zone as needed to effectively control the residence time and hydraulic load of the raw wastewater in the reaction zone to achieve the best treatment effect. After the raw wastewater completes the reaction in the hydrolysis and acidification stage in the lower reaction zone, it enters the methane production stage in the upper reaction zone through the lower acidification liquid riser 17 of the acidification liquid riser system and the upper water distribution pipe and upper water distributor of the water distribution system in the upper reaction zone. The hydraulic load of the methane production stage in the upper reaction zone is greater than the hydraulic load of the hydrolysis and acidification stage in the lower reaction zone. The total water volume is approximately the amount of the raw wastewater and reflux water in the hydrolysis and acidification stage in the lower reaction zone plus the reflux water volume in the methane production stage in the upper reaction zone. Due to the large amount of water in the methane production stage in the upper reaction zone, the rising speed of the mixed liquid is relatively fast. In addition to the gas production load, the suspended solids in the mixed liquid will be partially lifted by the biogas lifting pipe to the top gas-liquid separator 32 for separation. The separated reflux water flows back through the reflux pipe to form an internal circulation. In order to prevent the methanogens in the reflux water from flowing back into the hydrolysis and acidification stage of the lower reaction zone, thereby reducing the concentration of methanogens in the methanogenesis stage of the upper reaction zone and affecting the methane production, the upper openings of the reflux pipes of the two reaction zones entering the gas-liquid separator 32 are at different heights. The upper end of the lower internal reflux branch pipe 30 used for reflux in the hydrolysis and acidification stage of the lower reaction zone is higher than the upper end of the upper internal circulation reflux pipe 28 used for reflux in the methanogenesis stage of the upper reaction zone. The upper end of the upper internal circulation reflux pipe 28 is set at the bottom of the gas-liquid separator 32, which is conducive to the reflux of sludge.

[0033] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An IC anaerobic reactor staged reaction system comprises a tank body and a gas-liquid separator. A gas collecting device is provided in the upper portion of the tank body and is connected to the gas-liquid separator via a lifting pipe. The system is characterized in that: The tank body is divided into an upper reaction zone and a lower reaction zone by a partition plate, the gas collection device is located above the upper reaction zone, a lower acidizing liquid riser is provided through the middle of the partition plate, the upper end of the lower acidizing liquid riser is blocked, an upper water distributor is provided at the periphery of the lower acidizing liquid riser in the upper reaction zone, a lower water distributor connected to a water inlet device is provided at the bottom of the tank body in the lower reaction zone, the lower acidizing liquid riser is connected to the upper water distributor through an upper water distributor; a reflux pipe is provided through the gas collection device, the upper end of the reflux pipe is connected to the gas-liquid separator, and the reflux pipe is connected to the upper water distributor and the lower water distributor respectively; The return pipe includes an upper internal circulation return pipe, a lower internal circulation return pipe is sleeved on the outer side of the upper internal circulation return pipe, the upper end of the upper internal circulation return pipe extends out of the upper end of the lower internal circulation return pipe and is connected to the bottom of the gas-liquid separator, the lower end of the upper internal circulation return pipe is blocked, and a plurality of upper return water distribution pipes are provided through the lower internal circulation return pipe, the inner ends of the upper return water distribution pipes are connected to the lower end of the upper internal circulation return pipe and the outer ends are connected to the upper water distributor; The upper end of the lower internal circulation return pipe is sealedly connected to the outer wall of the upper internal circulation return pipe, the upper end of the lower internal circulation return pipe is connected to the gas-liquid separator through the lower internal circulation branch pipe, and the lower end of the lower internal circulation return pipe passes through the lower acidizing liquid riser to be connected to the lower water distributor; the upper end pipe opening of the lower internal circulation branch pipe is connected to the gas-liquid separator, and the upper end pipe opening of the lower internal circulation branch pipe is higher than the upper end pipe opening of the upper internal circulation return pipe.

2. The IC anaerobic reactor staged reaction system according to claim 1, wherein: The upper water distributor includes an upper inner water distributor, an upper outer water distributor is provided on the outer peripheral side of the upper inner water distributor, the upper water distribution pipe includes a plurality of upper inner water distribution pipes and upper outer water distribution pipes, the inner end of the upper inner water distribution pipe is connected to the lower acidizing liquid riser and the outer end is connected to the upper inner water distributor, the inner end of the upper outer water distribution pipe is connected to the lower acidizing liquid riser and the outer end is connected to the upper outer water distributor, and the outer end of the upper reflux water distribution pipe is located between the upper inner water distributor and the upper outer water distributor.

3. The IC anaerobic reactor staged reaction system according to claim 2, characterized in that: The upper return water distribution pipe, the upper inner water distribution pipe and the upper outer water distribution pipe are respectively evenly distributed along the circumference; the outer end pipe openings of the upper return water distribution pipe are respectively provided with upper return water distribution nozzles; the outer end pipe openings of the upper inner water distribution pipe are respectively provided with upper inner water distribution nozzles; the outer end pipe openings of the upper outer water distribution pipe are respectively provided with upper outer distribution nozzles; the outlet directions of the upper return water distribution nozzles, the upper inner water distribution nozzles and the upper outer water distribution nozzles are respectively arranged in the tangential direction, and the outlet directions of the upper return water distribution nozzles, the upper inner water distribution nozzles and the upper outer water distribution nozzles are the same; the upper return water distribution nozzles, the upper inner water distribution nozzles and the upper outer water distribution nozzles are respectively evenly distributed along the circumference.

4. The IC anaerobic reactor staged reaction system according to claim 1, characterized in that: The lower water distributor includes a lower inner return water distribution cylinder connected to the lower inner circulation return pipe, a sludge return cylinder is provided below the lower inner return water distribution cylinder, a lower inner water distributor is provided on the outer peripheral side of the sludge return cylinder, a lower outer water distributor is provided on the outer peripheral side of the lower inner water distributor, a plurality of lower inner return water distribution pipes are connected to the circumference of the lower inner return water distribution cylinder, and the outer end of the lower inner return water distribution pipe is located between the lower inner water distributor and the lower outer water distributor; a plurality of liquid inlet holes are provided on the circumferential direction of the upper cylinder wall of the sludge return cylinder, and a plurality of liquid outlet holes are provided on the circumferential direction of the lower cylinder wall of the sludge return cylinder.

5. The IC anaerobic reactor staged reaction system according to claim 1, characterized in that: The upper end of the lower inner reflux branch pipe extends into the gas-liquid separator and is connected to a slag retaining pipe. The inner diameter of the slag retaining pipe is larger than the diameter of the upper end of the lower inner reflux branch pipe. The upper end of the slag retaining pipe is higher than the upper end of the lower inner reflux branch pipe, and the lower end of the slag retaining pipe is lower than the lower end of the lower inner reflux branch pipe.

6. The IC anaerobic reactor staged reaction system according to claim 1, characterized in that: An annular upper casing is provided on the outer peripheral side of the upper end of the lower internal circulation return pipe, and an upper casing cavity connected to the pipe cavity of the lower internal circulation return pipe is provided in the upper casing, and the lower end pipe opening of the lower internal return branch pipe is connected to the upper casing cavity; an annular lower casing is provided on the lower internal circulation return pipe at the outer peripheral side of the lower end of the upper internal circulation return pipe, and a lower casing cavity connected to the pipe cavity of the lower internal circulation return pipe is provided in the lower casing, and the upper return water distribution pipe passes through the lower casing cavity.

7. The IC anaerobic reactor staged reaction system according to claim 1, characterized in that: The portion of the upper end of the upper internal circulation reflux pipe extending out of the lower internal circulation reflux pipe is provided with a control valve; the upper end of the lower acidizing liquid rising pipe is connected to an anti-gas blockage pipe, which is connected to the gas-liquid separator.

8. The IC anaerobic reactor staged reaction system according to any one of claims 1 to 7, characterized in that: The gas collection device includes a gas collector and a three-phase separator arranged in sequence above the upper reaction zone, the lifting pipeline includes a first-level lifting pipe and a second-level lifting pipe, the gas collector is connected to the gas-liquid separator through the first-level lifting pipe, and the three-phase separator is connected to the gas-liquid separator through the second-level lifting pipe.

Images