FmLBR-CSTBR two-phase anaerobic digestion system
By adopting the FmLBR-CSTBR two-phase system in an anaerobic reactor, the reaction efficiency is improved by using a turbine stirrer and a cone cover, and the microbial activity is retained through suspended filter material and three-phase separator, the existing anaerobic reactor is solved. The problems of insufficient reaction and microbial loss have achieved more efficient organic degradation and methane production.
Patent Information
- Application Number
- CN202411849295.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-02-14
AI Technical Summary
In the existing anaerobic reactor, the LBR reactor is in a standstill state, resulting in uneven distribution of reactants and insufficient reaction; the substrate effluent in the CSTR reactor is not completely digested, and the microorganisms are lost, which affects the treatment effect.
Using the FmLBR-CSTBR two-phase anaerobic digestion system, the turbine stirrer and cone cover are set up in the FmLBR reactor to achieve full mixing of reaction materials and efficient discharge of leachate; the suspension filter material and three are set up in the CSTBR reactor. Phase separator to improve the activity and retention rate of microorganisms.
It improves the organic matter removal rate and the hydrolysis rate of difficult-to-degrade organic matter, promotes the activities of acid-producing bacteria and methanogenic bacteria, prevents the inhibition of methanogenic bacteria, and enhances the efficiency and stability of the anaerobic reaction.
Smart Images
Figure CN119432566A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of anaerobic reactors, in particular to a FmLBR-CSTBR two-phase anaerobic digestion system. Background Art
[0002] With the acceleration of urbanization, the amount of high-organic solid waste generated has increased year by year, posing a serious threat to the environment and human health. To achieve sustainable urban development, the management of high-organic solid waste is an unavoidable topic. The most commonly used treatment methods are incineration and landfill. Although they can reduce the pollution of urban organic solid waste, incineration will cause toxic and harmful gases to enter the air, and landfill will occupy a large amount of land, which will have a considerable impact on the environment. Anaerobic digestion is the most common technology for treating urban high-organic solid waste. Through the anaerobic environment, microorganisms are used to convert the residual energy in solid waste into methane, and the role of microorganisms is used to reduce the environmental hazards caused by solid waste.
[0003] Among anaerobic reactors, there are leachate bed reactors (LBR) and continuous stirred tank reactors (CSTR) to treat high organic solid waste. However, the LBR in the prior art is generally in a static state, and there are problems such as the reactants cannot be evenly distributed in the entire reactor, resulting in incomplete reaction; the leachate is not easy to leach; the hydrolysis and acidification process is relatively slow; the CSTR may not be completely digested when the substrate flows out, and the microorganisms are also lost, affecting the treatment effect.
[0004] Therefore, a FmLBR-CSTBR two-phase anaerobic digestion system was proposed. Summary of the invention
[0005] The object of the present invention is to provide a FmLBR-CSTBR two-phase anaerobic digestion system, aiming to solve or improve at least one of the above-mentioned technical problems.
[0006] To achieve the above object, the present invention provides the following scheme: The present invention provides a FmLBR-CSTBR two-phase anaerobic digestion system, comprising:
[0007] An FmLBR reactor, wherein the FmLBR reactor is used to hydrolyze and acidify the material to produce leachate, and a discharge port is provided at the bottom of the FmLBR reactor;
[0008] A CSTBR reactor, wherein the second feed port on the CSTBR reactor is connected to the discharge port, and a suspended filter material is arranged in the CSTBR reactor;
[0009] A stirring mechanism, the stirring mechanism includes a driving assembly arranged on the FmLBR reactor, the output end of the driving assembly is fixedly connected to a rotating shaft, the rotating shaft extends into the FmLBR reactor and is circumferentially provided with a plurality of turbine agitators, a conical cover is fixedly connected to the bottom of the rotating shaft, the large diameter end of the conical cover is open and is in sliding contact with the bottom wall of the FmLBR reactor, the conical cover is arranged above the discharge port, and a plurality of percolation holes are circumferentially opened on the side wall of the conical cover.
[0010] Optionally, the shaft outer sleeve is provided with a collar, and a plurality of stirring plates are circumferentially fixed to the side wall of the collar, and the plurality of stirring plates are arranged around the conical cover and in contact with the outer side wall of the conical cover.
[0011] Optionally, the collar is rotatably connected to the rotating shaft, a plurality of limit blocks are fixedly connected to the side walls of the rotating shaft, a plurality of limit grooves are opened on the inner wall of the collar, the limit blocks are slidably connected to the limit grooves, springs are respectively fixedly connected to the two opposite side walls of the limit block, and the other end of the spring is fixedly connected to the side walls of the limit grooves.
[0012] Optionally, the turbine agitator includes a turbine motor fixedly connected to the side wall of the rotating shaft, a connecting rod is provided on the output shaft of the turbine motor, a plurality of turbine disks are provided on the outer fixed sleeve of the connecting rod, and a plurality of stirring blades are circumferentially fixed on the turbine disk.
[0013] Optionally, a slide bar is fixedly connected to the output shaft of the turbine motor, a rectangular bar is rotatably sleeved outside the slide bar, a transmission assembly is provided on the rotating shaft and is transmission-connected to the rectangular bar, the transmission assembly is used to drive the rectangular bar to rotate, and the rotation direction of the rectangular bar is opposite to that of the slide bar;
[0014] A rectangular groove is formed at one end of the connecting rod close to the turbine motor, and a threaded groove is formed at one end of the rectangular groove away from the turbine motor. A threaded rod is fixedly connected to the end of the sliding rod, and the threaded rod passes through the rectangular groove and is threadedly connected to the threaded groove. The rectangular rod is slidably connected to the rectangular groove.
[0015] Optionally, the transmission assembly includes a first gear fixedly mounted outside the rotating shaft, a second gear meshing with the first gear, the second gear being rotatably connected to the side wall of the rotating shaft, a cover shell fixedly connected to the side wall of the rotating shaft, an annular cylinder rotatably connected to the cover shell, the first gear and the second gear are located in the annular cylinder, a tooth groove is formed on the inner wall of the annular cylinder, the second gear meshes with the tooth groove, and the annular cylinder is fixedly connected to the rectangular rod.
[0016] Optionally, the discharge port is connected to a first regulating tank through a second sewage pump, and the water outlet end of the first regulating tank is connected to the second feed port through a third sewage pump; a sixth sewage pump is connected between the second sewage pump and the first regulating tank through a first connecting pipe, and the discharge end of the sixth sewage pump extends into the FmLBR reactor and is connected to a spray head, and the spray head is located above the FmLBR reactor.
[0017] Optionally, an axial flow agitator is provided on the CSTBR reactor, and a bottom stirring paddle on the axial flow agitator penetrates the suspended filter material and extends into the bottom of the CSTBR reactor. The second feed inlet is located at the bottom of the side wall of the CSTBR reactor. A three-phase separator is provided in the CSTBR reactor, and the three-phase separator is located above the suspended filter material.
[0018] Optionally, a liquid outlet is provided on the side wall of the CSTBR reactor, the liquid outlet is located above the three-phase separator, a second regulating tank is provided between the liquid outlet and the second feed port, the second regulating tank is located at the discharge end of the third sewage pump, and a fourth sewage pump is provided between the second regulating tank and the second feed port; a dosing room is provided between the second regulating tank and the first connecting pipe, the dosing room is located at the feed end of the sixth sewage pump, and a fifth sewage pump is provided between the dosing room and the second regulating tank.
[0019] Optionally, the bottom of the CSTBR reactor is a conical bottom, the conical bottom of the CSTBR reactor is connected to a sludge storage tank, the discharge end of the sludge storage tank is connected to a storage bin through a sludge pump, and the bottom of the side wall of the storage bin is connected to the first feed port at the top of the FmLBR reactor through a first sewage pump.
[0020] The present invention discloses the following technical effects:
[0021] 1. The present invention adopts FmLBR-CSTBR two-phase anaerobic treatment, realizes a two-phase separated anaerobic digestion process in a two-phase system, and can control the hydrolysis acidification reaction and the methanogenesis reaction in the anaerobic digestion process separately. Compared with single-phase anaerobic treatment, the reaction conditions of the two stages can be controlled separately, which not only improves the organic matter removal rate and the hydrolysis rate of difficult-to-degrade organic matter, but also effectively promotes the activity of acidogenic bacteria and methanogenic bacteria, and prevents methanogenic bacteria from being inhibited.
[0022] 2. The present application sets a turbine agitator in the FmLBR reactor, so that the reaction materials can be fully mixed, the reaction efficiency and the uniformity of the reaction materials can be improved, thereby accelerating the hydrolysis acidification reaction process; at the same time, the present application sets a conical cover at the bottom of the rotating shaft, and the leachate flows into the discharge port through the infiltration holes on the conical cover to prevent the discharge port from being blocked, and because the side wall of the conical cover is an inclined surface, the conical cover rotates with the rotating shaft, so that the material flows downward along the conical cover, thereby avoiding the blockage of the leachate; therefore, during the stirring process, the contact area between the reaction material and the agitator is increased, which can not only control the material temperature to remain within the reaction conditions, but also prevent blockage so that the leachate can be efficiently discharged from the system.
[0023] 3. The present application sets a suspended filler and a three-phase separator in the CSTBR reactor, which can make the CSTBR maintain a high biomass, help the adsorption of microorganisms, and thus improve the efficiency of anaerobic treatment. The three-phase separator above the floating filler can realize the effective separation of gas, liquid and solid phases, and can retain microorganisms in the suspended filler to a greater extent, reduce the loss of microorganisms, and have sufficient microbial content when reacting with organic matter in the leachate, thereby accelerating the degradation process of organic matter and improving the anaerobic reaction effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0025] Figure 1 It is a structural schematic diagram of the present invention;
[0026] Figure 2 It is a top view of the stirring mechanism 2.2 in the present invention;
[0027] Figure 3 It is a schematic diagram of the structure of the sliding rod, the threaded rod and the connecting rod in the present invention;
[0028] Figure 4 It is a schematic diagram of the structure of the turbine agitator in the present invention;
[0029] Figure 5 It is a radial cross-sectional view of the sleeve ring and the rotating shaft in the present invention.
[0030] In the figure: 1. Storage silo; 1.1. Loading end; 1.2. First sewage pump; 1.3. First electromagnetic flowmeter; 1.4. First valve; 2. FmLBR reactor; 2.1. First feed inlet; 2.2. Stirring mechanism; 2.3. Sprinkler; 2.4. Filter layer; 2.5. Discharge port; 2.6. Second electromagnetic flowmeter; 2.7. Second sewage pump; 2.8. First motor; 2.9. First gas online analyzer; 2.1 0. First insulation layer; 2.11. First regulating tank; 2.12. Third sewage pump; 2.13. Second valve; 2.14. Third electromagnetic flowmeter; 2.15. First probe contact thermometer; 2.16. First water quality pH sensor; 3. CSTBR reactor; 3.1. Second feed inlet; 3.2. Axial flow agitator; 3.3. Suspended filter material; 3.4. Second insulation layer; 3.5. Three-phase separator; 3.6. The second motor; 3.7, the second gas online analyzer; 3.8, the liquid outlet; 3.9, the fourth electromagnetic flowmeter; 3.10, the third valve; 3.11, the fourth sewage pump; 3.12, the fifth electromagnetic flowmeter; 3.13, the fifth sewage pump; 3.14, the fourth valve; 3.15, the fifth valve; 3.16, the sixth sewage pump; 3.17, the sixth electromagnetic flowmeter; 3.18, the sixth valve; 3.19, the sludge pump; 3.20, the seventh electromagnetic flowmeter; 3.21, the second probe rod contact thermometer; 3.22, the second water quality pH sensor; 3.23, the third water quality pH sensor; 3.24, the third probe rod contact thermometer; 3.25, the fourth water quality pH sensor; 3.26, the second regulating tank; 3.27, the fifth water quality pH sensor; 3.28, the fourth probe rod contact thermometer; 3.29, the dosing room; 3.30, the sludge storage tank;
[0031] 4. Rotating shaft; 5. Conical cover; 6. Percolation hole; 7. Ring; 8. Stirring plate; 9. Limit block; 10. Limit groove; 11. Spring; 12. Turbine motor; 13. Connecting rod; 14. Turbine disc; 15. Stirring blade; 16. Sliding rod; 17. Rectangular rod; 18. Threaded groove; 19. Threaded rod; 20. Rectangular groove; 21. First gear; 22. Second gear; 23. Cover; 24. Annular cylinder. DETAILED DESCRIPTION
[0032] 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.
[0033] With the acceleration of urbanization, the amount of high-organic solid waste has increased year by year, posing a serious threat to the environment and human health. Landfills have complex components, usually containing a variety of organic matter, heavy metals and other harmful substances. The complexity of these components brings difficulties to treatment and resource utilization; low treatment efficiency; secondary pollution problems. Some treatment technologies may produce new pollutants in the process of degrading organic pollutants, increasing environmental risks; insufficient technical maturity and other problems. To achieve sustainable urban development, the management of high-organic solid waste is an unavoidable topic. The most commonly used treatment methods are incineration and landfill. Although they can reduce the pollution of urban organic solid waste, incineration will cause toxic and harmful gases to enter the air, and landfills occupy a large amount of land, which will have a considerable impact on the environment. In addition, there is still other value in high-organic solid waste that has not been utilized. It is not possible to efficiently treat high-organic solid waste as a resource and harmlessly, resulting in a large waste of resources.
[0034] Anaerobic digestion is the most common technology for treating high-organic solid waste in cities. Through the anaerobic environment, microorganisms are used to convert the residual energy in solid waste into methane, and the environmental harm caused by solid waste is reduced by the action of microorganisms. Anaerobic digestion technology is one of the important ways to achieve the "three transformations" of organic waste, and is widely used in the treatment of high-organic solid pollutants such as kitchen waste, fruit and vegetable waste, garden waste, and industrial sewage. At present, most anaerobic reactors for treating urban organic solid waste are single-phase anaerobic reactors. Single-phase anaerobic treatment faces more challenges in controlling reaction conditions, because the optimal conditions of the two microorganisms may be different and may interfere with each other; the efficiency and stability of single-phase anaerobic treatment may not be as good as two-phase anaerobic treatment, because methanogens are easily inhibited by the acidic environment during acid production; the single-phase anaerobic treatment range may be more suitable for treating specific types of wastewater. In general, the reaction time of single-phase anaerobic treatment is too long, the treatment effect is limited, the gas production is unstable, the methane content in biogas is not high, and it may cause secondary pollution and other problems.
[0035] Among the anaerobic reactors, there are leachate bed reactors (LBR) and continuous stirred tank reactors (CSTR) to treat high organic solid waste. LBR is a reactor used for anaerobic treatment of high organic solid waste. It simulates the natural percolation process and uses specific medium materials to enhance the anaerobic fermentation process, thereby improving the production and treatment efficiency of biogas. However, LBR is in a natural static state, and the reactants cannot be evenly distributed throughout the reactor, resulting in incomplete reaction; leachate is not easy to leach; the hydrolysis and acidification process is relatively slow. CSTR is a bioreactor commonly used to treat organic wastewater and organic solid waste. CSTR has sufficient mass transfer and heat transfer, and ensures complete mixing of materials and microorganisms through stirring, which is conducive to uniform reaction and heat transfer, thereby improving fermentation efficiency; it can process raw materials with high suspended solids content; it has the advantages of low cost, good operational stability, and wide applicability. However, in the CSTR reactor, the substrate may not be completely digested when it flows out, and the microorganisms are also lost, affecting the treatment effect.
[0036] FmLBR is a fully mixed leaching bed reactor, also known as FmLBR; CSTBR is a continuous stirred tank biofilm reactor, also known as CSTBR.
[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0038] Reference Figure 1-Figure 5 The present invention provides a FmLBR-CSTBR two-phase anaerobic digestion system, comprising:
[0039] FmLBR reactor 2, FmLBR reactor 2 is used to make the material undergo an acidification reaction to produce leachate, and a discharge port 2.5 is provided at the bottom of the FmLBR reactor 2;
[0040] CSTBR reactor 3, a second feed port 3.1 on the CSTBR reactor 3 is connected to the discharge port 2.5, and a suspended filter material 3.3 is arranged in the CSTBR reactor 3;
[0041] A stirring mechanism 2.2, the stirring mechanism 2.2 includes a driving assembly arranged on the FmLBR reactor 2, the output end of the driving assembly is fixedly connected to a rotating shaft 4, the rotating shaft 4 extends into the FmLBR reactor 2 and is circumferentially provided with a plurality of turbine agitators, a conical cover 5 is fixedly connected to the bottom of the rotating shaft 4, the large diameter end of the conical cover 5 is open and in sliding contact with the inner bottom wall of the FmLBR reactor 2, the conical cover 5 is arranged above the discharge port 2.5, and a plurality of percolation holes 6 are circumferentially provided on the side wall of the conical cover 5.
[0042] This embodiment adopts FmLBR-CSTBR two-phase anaerobic treatment, and realizes a two-phase separated anaerobic digestion process in a two-phase system. The hydrolysis acidification reaction and the methanogenesis reaction in the anaerobic digestion process can be controlled separately. Compared with single-phase anaerobic treatment, the reaction conditions of the two stages can be controlled separately, which not only improves the organic matter removal rate and the hydrolysis rate of difficult-to-degrade organic matter, but also effectively promotes the activity of acid-producing bacteria and methanogens, and prevents methanogens from being inhibited.
[0043] In this embodiment, a turbine agitator is provided in the FmLBR reactor 2, so that the reaction materials can be fully mixed, the reaction efficiency and the uniformity of the reaction materials can be improved, and the hydrolysis acidification reaction process can be accelerated; at the same time, a conical cover 5 is provided at the bottom of the rotating shaft 4, and the leachate flows into the discharge port 2.5 through the percolation holes 6 on the conical cover 5 to prevent the discharge port 2.5 from being blocked, and because the side wall of the conical cover 5 is an inclined surface, the conical cover 5 rotates with the rotating shaft 4, so that the material flows downward along the conical cover 5, thereby avoiding the blockage of the percolation holes 6; therefore, during the stirring process, the contact area between the reaction material and the agitator is increased, which can not only control the material temperature to be kept within the reaction conditions, but also prevent blockage so that the leachate can be efficiently discharged from the system.
[0044] In some optional embodiments, a collar 7 is disposed on the outer sleeve of the rotating shaft 4 , and a plurality of stirring plates 8 are circumferentially fixed to the side wall of the collar 7 . The plurality of stirring plates 8 are disposed around the conical cover 5 and in contact with the outer side wall of the conical cover 5 .
[0045] In some optional embodiments, the collar 7 is rotatably connected to the rotating shaft 4, a plurality of limit blocks 9 are fixedly connected to the side wall of the rotating shaft 4, a plurality of limit grooves 10 are opened on the inner wall of the collar 7, the limit blocks 9 are slidably connected to the limit grooves 10, and springs 11 are respectively fixedly connected to the opposite side walls of the limit block 9, and the other end of the spring 11 is fixedly connected to the side wall of the limit groove 10.
[0046] The driving assembly includes a first motor 2.8 fixedly connected to the FmLBR reactor 2. The first motor 2.8 is connected to the rotating shaft 4 through a transmission system. The first motor 2.8 can drive the rotating shaft 4 to rotate. The rotating shaft 4 rotates to drive the conical cover 5 to rotate, so that the material on the conical cover 5 flows downward, and an interaction force is generated between the conical cover 5 and the material during the rotation process, thereby preventing the material from adhering to the conical cover 5 and reducing the blockage of the percolation hole 6.
[0047] At the same time, the rotating shaft 4 drives the limit block 9 to rotate, and drives the sleeve ring 7 to rotate under the action of the spring 11, thereby rotating the stirring plate 8. The rotation of the stirring plate 8 can further enhance the stirring effect of the material and improve the uniformity of material mixing. And due to the existence of the spring 11, when the stirring plate 8 collides with the material during the stirring process, the spring 11 can buffer the force and improve the protective effect of the stirring plate 8. And because the material composition at different positions is not completely consistent, the materials at different positions give different forces to the stirring plate 8 during the rotation of the stirring plate 8, causing the spring 11 to be repeatedly compressed and extended, so that the stirring plate 8 slides relative to the conical cover 5 during the rotation, thereby forming a scraping effect on the surface of the conical cover 5, further reducing the blockage of the percolation holes 6 on the conical cover 5.
[0048] In some optional embodiments, the turbine agitator includes a turbine motor 12 fixedly connected to the side wall of the rotating shaft 4, a connecting rod 13 is provided on the output shaft of the turbine motor 12, a plurality of turbine disks 14 are provided on the outer fixed sleeve of the connecting rod 13, and a plurality of stirring blades 15 are circumferentially fixed on the turbine disk 14.
[0049] In some optional embodiments, a slide bar 16 is fixedly connected to the output shaft of the turbine motor 12, a rectangular rod 17 is rotatably sleeved outside the slide bar 16, a transmission assembly connected to the rectangular rod 17 is provided on the rotating shaft 4, and the transmission assembly is used to drive the rectangular rod 17 to rotate, and the rotation direction of the rectangular rod 17 is opposite to that of the slide bar 16;
[0050] A rectangular groove 20 is formed at one end of the connecting rod 13 close to the turbine motor 12, and a threaded groove 18 is formed at the other end of the rectangular groove 20 away from the turbine motor 12. A threaded rod 19 is fixedly connected to the end of the sliding rod 16. The threaded rod 19 passes through the rectangular groove 20 and is threadedly connected to the threaded groove 18. The rectangular rod 17 is slidably connected to the rectangular groove 20.
[0051] In some optional embodiments, the transmission assembly includes a first gear 21 fixedly mounted on the outside of the rotating shaft 4, a second gear 22 is meshed on the first gear 21, the second gear 22 is rotatably connected to the side wall of the rotating shaft 4, a cover shell 23 is fixedly connected to the side wall of the rotating shaft 4, an annular cylinder 24 is rotatably connected to the cover shell 23, the first gear 21 and the second gear 22 are located in the annular cylinder 24, a tooth groove is opened on the inner wall of the annular cylinder 24, the second gear 22 is meshed with the tooth groove, and the annular cylinder 24 is fixedly connected to the rectangular rod 17.
[0052] The cover 23 is arranged outside the turbine motor 12 to provide a protective effect for the turbine motor 12. When in use, the rotating shaft 4 rotates to drive the turbine agitator to rotate. The turbine agitator has a large shear force, which can disperse the fluid micro-clusters very finely, further mix the materials completely, and better maintain the temperature inside the FmLBR within the applicable range.
[0053] When the rotating shaft 4 rotates, the turbine motor 12 drives the sliding rod 16 to rotate. The rotation of the sliding rod 16 drives the first gear 21 to rotate, so that the second gear 22 rotates. The second gear 22 engages with the tooth groove, so that the annular cylinder 24 rotates. The rotation direction of the sliding rod 16 is opposite to that of the annular cylinder 24. Since the threaded rod 19 is fixedly connected to the sliding rod 16 and the rectangular rod 17 is fixedly connected to the annular cylinder 24, the threaded rod 19 and the rectangular rod 17 rotate synchronously, and the rotation directions are opposite. Since the rectangular rod 17 is slidably connected to the connecting rod 13, the threaded rod 19 is threadedly connected to the connecting rod 13, so the connecting rod 13 and the threaded rod 19 are threadedly rotated, and the connecting rod 13 slides along the rectangular rod 17 at the same time. The turbine motor 12 is a stepping motor and can be reversed, so that the connecting rod 13 slides back and forth along the rectangular rod 17, driving the stirring blade 15 to rotate around the sliding rod 16 while moving back and forth horizontally, thereby greatly improving the stirring effect of the material.
[0054] In some optional embodiments, the discharge port 2.5 is connected to the first regulating tank 2.11 through the second sewage pump 2.6, and the water outlet end of the first regulating tank 2.11 is connected to the second feed port 3.1 through the third sewage pump 2.12; the second sewage pump 2.6 and the first regulating tank 2.11 are connected to the sixth sewage pump 3.16 through the first connecting pipe, and the discharge end of the sixth sewage pump 3.16 extends into the FmLBR reactor 2 and is connected to the spray head 2.3, and the spray head 2.3 is located above the FmLBR reactor 2.
[0055] In this embodiment, a first insulation layer 2.10 is provided on the side wall of the FmLBR reactor 2 to facilitate maintaining a suitable temperature, and a first gas online analyzer 2.9 is provided on the FmLBR reactor 2. A filter layer 2.4 is provided on the discharge port 2.5 to filter the leachate, and a second electromagnetic flowmeter 2.7 is provided between the second sewage pump 2.6 and the first regulating tank 2.11 to detect the leachate flowing out of the discharge port 2.5. A first probe-type contact thermometer 2.15 and a first water quality pH sensor 2.16 are provided on the first regulating tank 2.11 to detect the temperature and pH value in the first regulating tank 2.11. A sixth electromagnetic flowmeter 3.17 is provided at the liquid outlet of the sixth sewage pump 3.16. A second valve 2.13 and a third electromagnetic flowmeter 2.14 are provided between the third sewage pump 2.12 and the second feed port 3.1, and the third electromagnetic flowmeter 2.14 is used to detect the leachate flow output from the first regulating tank 2.11.
[0056] In this embodiment, the sixth sewage pump 3.16 is connected through the first connecting pipe, and a spray head 2.3 is provided to form a self-circulating system of the FmLBR reactor 2. The leachate flowing out of the discharge port 2.5 is pumped into the spray head 2.3 through the sixth sewage pump 3.16 and sprayed onto the top of the material, so that the leachate flows from top to bottom in the FmLBR reactor 2, thereby improving the mixing effect of the leachate and the material.
[0057] In some optional embodiments, an axial flow agitator 3.2 is provided on the CSTBR reactor 3, and the bottom stirring paddle on the axial flow agitator 3.2 penetrates the suspended filter material 3.3 and extends into the bottom of the CSTBR reactor 3, the second feed inlet 3.1 is located at the bottom of the side wall of the CSTBR reactor 3, and a three-phase separator 3.5 is provided in the CSTBR reactor 3, and the three-phase separator 3.5 is located above the suspended filter material 3.3.
[0058] In this embodiment, the CSTBR reactor 3 is fixedly connected to a second motor 3.6, which is fixedly connected to the stirring shaft on the axial flow agitator 3.2 through a transmission assembly, thereby driving the stirring shaft on the axial flow agitator 3.2 to rotate, so that the stirring paddle stirs the bottom of the CSTBR reactor 3.
[0059] The suspended filter material 3.3 acts as a biofilm, which can keep the CSTBR reactor 3 at a high biomass and help the adsorption of microorganisms, thereby improving the efficiency of anaerobic treatment; the filler biofilm provides a diverse growth environment, which is conducive to maintaining and promoting microbial diversity and having a rich microbial community, so that the filler biofilm system can withstand higher influent pollutant load fluctuations and has a strong ability to resist shock loads; the structure of the biofilm can also protect the microorganisms from adverse external conditions, such as toxic substances, heavy metals and flow rate changes, so that the biofilm can maintain activity for a longer period of time; it has the advantages of convenient operation and management and low cost.
[0060] The three-phase separator 3.5 above the suspended filter material 3.3 can realize the effective separation of the three phases of gas, liquid and solid, and can retain the microorganisms in the suspended filter material 3.3 to a greater extent, reduce the loss of microorganisms, and have sufficient microorganism content when reacting with organic matter in the leachate, thereby accelerating the degradation process of organic matter and improving the anaerobic reaction effect.
[0061] The CSTBR reactor 3 has water inlet at the bottom and outlet at the top, and is stirred by an axial flow stirrer 3.2, so that the added leachate is fully mixed with the mixed liquid in the reactor under the dual combination of hydraulic stirring and mechanical stirring.
[0062] In this embodiment, a second insulation layer 3.4 is set on the side wall of the CSTBR reactor 3, a second gas online analyzer 3.7 is set on the CSTBR reactor 3, a second water quality pH sensor 3.22 is set at the bottom of the side wall, a third water quality pH sensor 3.23 is set at the top of the side wall, and a second probe-type contact temperature meter 3.21 is set at the bottom.
[0063] In some optional embodiments, a liquid outlet 3.8 is provided on the side wall of the CSTBR reactor 3, the liquid outlet 3.8 is located above the three-phase separator 3.5, a second regulating tank 3.26 is provided between the liquid outlet 3.8 and the second feed port 3.1, the second regulating tank 3.26 is located at the discharge end of the third sewage pump 2.12, and a fourth sewage pump 3.11 is provided between the second regulating tank 3.26 and the second feed port 3.1;
[0064] A dosing room 3.29 is provided between the second regulating tank 3.26 and the first connecting pipe. The dosing room 3.29 is located at the feed end of the sixth sewage pump 3.16. A fifth sewage pump 3.13 is provided between the dosing room 3.29 and the second regulating tank 3.26.
[0065] In this embodiment, a fourth electromagnetic flowmeter 3.9 is provided between the second regulating tank 3.26 and the liquid outlet 3.8, a fifth electromagnetic flowmeter 3.12 and a third valve 3.10 are provided between the second regulating tank 3.26 and the second feed port 3.1, and a third probe-rod contact thermometer 3.24 and a fourth water quality pH sensor 3.25 are provided on the second regulating tank 3.26; the water at the top of the CSTBR reactor 3 enters the second regulating tank 3.26, and then enters the second feed port 3.1 through the fourth sewage pump 3.11, thereby forming an external self-circulation of the CSTBR reactor 3.
[0066] In this embodiment, a fifth water quality pH sensor 3.27 and a fourth probe-type contact temperature measuring instrument 3.28 are arranged on the dosing room 3.29, a fourth valve 3.14 is arranged between the dosing room 3.29 and the second regulating tank 3.26, and a fifth valve 3.15 is arranged between the dosing room 3.29 and the sixth sewage pump 3.16; the liquid in the second regulating tank 3.26 enters the dosing room 3.29, and then enters the FmLBR reactor 2, realizing the cross circulation of the two systems.
[0067] In some optional embodiments, the bottom of the CSTBR reactor 3 is a conical bottom, and the conical bottom of the CSTBR reactor 3 is connected to a sludge storage tank 3.30. The discharge end of the sludge storage tank 3.30 is connected to a storage bin 1 through a sludge pump 3.19. The bottom of the side wall of the storage bin 1 is connected to the first feed port 2.1 at the top of the FmLBR reactor 2 through a first sewage pump 1.2.
[0068] In this embodiment, a sixth valve 3.18 and a seventh electromagnetic flowmeter 3.20 are provided between the storage bin 1 and the mud storage tank 3.30, a loading end 1.1 is provided at the top of the storage bin 1, and a first electromagnetic flowmeter 1.3 and a first valve 1.4 are provided between the storage bin 1 and the FmLBR reactor 2.
[0069] The sludge at the bottom of the CSTBR reactor 3 enters the sludge storage tank 3.30, and then enters the storage bin 1, and is added to the FmLBR reactor 2 through the storage bin 1 to form a circulation of the entire system.
[0070] A regulating tank was set up between the FmLBR device and the CSTBR to control the circulation time of the leachate, making the experimental variables more stable, and to monitor the hydrolysis efficiency of the FmLBR. A regulating tank was set up between the CSTBR and FmLBR reactors, and the dosing tank not only adjusted the pH and reflux rate of the leachate, but also further studied the anaerobic digestion of leachates with different substances after reflux.
[0071] The process flow of the present invention is simple and the operation and management are convenient. The two-phase anaerobic fermentation has a good gas production and a high methane content through the action of the conical agitator and the filler biofilm. The two-phase digestion system performs anaerobic digestion and realizes solid-liquid separation. The continuous circulation of the two-phase leachate further increases the methane production. The sludge in the sludge storage tank can be used as high-quality inoculum for anaerobic fermentation.
[0072] The working process of this device is as follows:
[0073] Embodiment 1:
[0074] 1. Reactor startup
[0075] Different proportions of urban organic solid waste with high solid content, such as kitchen waste, fruit and vegetable waste, garden waste, agricultural waste, and residual anaerobic sludge with a VS ratio of 1 are added to the storage bin 1 for inoculation, so that its C / N ratio is 1:20-1:30. Different physical and chemical methods can be used to pretreat the urban organic solid waste with high solid content before adding the sludge to improve the reaction efficiency of the urban organic solid waste with high solid content, and the materials can be stirred to mix well.
[0076] 2. Hydrolysis and acidification stage
[0077] The material in the storage bin 1 enters the FmLBR reactor 2 through the first sewage pump 1.2, and the material is mixed again in the FmLBR reactor 2 under the action of the agitator. In the FmLBR reactor 2, the acidification reaction of hydrolysis and acidification bacteria mainly occurs, producing leachate, and the leachate flows downward under the action of the percolation hole 6. The leachate flows to the filter layer 2.4 composed of a 2mm filter mesh, and after being filtered through the filter layer 2.4, it flows to the discharge port 2.5. The output of the leachate in the initial stage of the hydrolysis and acidification reaction is too low. The leachate is sprayed into the inside of the FmLBR reactor 2 through the spray head 2.3 connected to the second sewage pump 2.6 and the sixth sewage pump 3.16, so as to realize the single-phase circulation of the FmLBR reactor 2, and then the material and the leachate are evenly mixed under the action of the agitator to improve the hydrolysis efficiency. When the output of the leachate reaches a certain amount, the next stage of reaction is carried out. The leachate mainly contains substances such as short fatty acids and alcohols.
[0078] 3. Methane production stage
[0079] After the amount of leachate produced by the FmLBR reactor 2 reaches the requirement, the methanogenic stage is started. The leachate first enters the first regulating tank 2.11 for storage and regulation to prevent the overload of the CSTBR reactor 3 from affecting the enrichment of microorganisms. The leachate in the first regulating tank 2.11 passes through the third sewage pump 2.12, the second valve 2.13 and the third electromagnetic flowmeter 2.14 to the second feed port 3.1, and is evenly mixed under the action of the axial flow agitator 3.2 and the CSTBR reactor 3's own hydraulics. When the leachate rises, it will produce methane and enrich microorganisms in the suspended filter material 3.3. Methane-producing microorganisms can be enriched on the suspended filler 3.3, which increases the rate of methane production. At the same time, the CSTBR reactor 3 is equipped with a three-phase separator 3.5 to achieve effective separation of gas, liquid and solid phases to retain the content of microorganisms to the greatest extent. The single-phase circulation of the CSTBR reactor 3 is realized through the second regulating tank 3.26 and the fourth sewage pump 3.11. Part of the leachate entering the CSTBR reactor 3 will enter the sludge storage tank 3.30, and the leachate in the second regulating tank 3.26 will enter the dosing room 3.29 through the fifth sewage pump 3.13 to adjust the pH of the leachate. The leachate in the dosing room will be sprayed into the FmLBR reactor 2 by the sprinkler head 2.3 through the sixth sewage pump 3.16, so that the system enters the cross-circulation mode of the FmLBR reactor 2 and the CSTBR reactor 3.
[0080] 4 Monitoring measures
[0081] Each pH sensor is used to monitor pH changes; each electromagnetic flow meter is used to measure flow and control flow changes; each probe-type contact thermometer is used to observe temperature changes to ensure that the anaerobic reaction in the reactor is within a suitable range; each gas analyzer can realize online monitoring of generated gas and methane production.
[0082] The first insulation layer 2.10 and the second insulation layer 3.4 should ensure that the medium temperature of 35°C to 40°C or the high temperature of 55°C to 58°C required by the anaerobic digestion microbial reaction is met.
[0083] Example 2
[0084] 1 Reactor start-up
[0085] Different proportions of urban organic solid waste with high solid content, such as kitchen waste, fruit and vegetable waste, garden waste, agricultural waste, and sludge stored in the sludge storage tank 3.30 are added to the storage bin 1 to inoculate the sludge so that its C / N ratio is 1:20-1:30. Different physical and chemical methods can be used to pretreat the urban organic solid waste with high solid content before adding the sludge to improve the reaction efficiency of the urban organic solid waste with high solid content, and the materials can be stirred to mix well.
[0086] 2 Hydrolysis and acidification stage
[0087] The material in the storage bin 1 enters the CFmLBR reactor 2 through the sewage pump 1.2, and the material is mixed again in the CFmLBR reactor 2 under the action of the agitator. And in the CFmLBR reactor 2, the acidification reaction of hydrolysis and acidification bacteria mainly occurs to produce leachate. The leachate flows to the filter layer 2.4 composed of a 2mm filter mesh, and after being filtered through the filter layer 2.4, it flows to the discharge port 2.5. In the early stage of the hydrolysis and acidification reaction, the output of the leachate is too low. The leachate is sprayed into the CFmLBR reactor 2 through the spray head 2.3 connected to the second sewage pump 2.6 and the sixth sewage pump 3.16, so as to realize the single-phase circulation of the CFmLBR reactor 2, and then the material and the leachate are evenly mixed under the action of the conical agitator 2.2 to improve the hydrolysis efficiency. When the output of the leachate reaches a certain amount, the next stage of reaction is carried out. The leachate mainly contains substances such as short fatty acids and alcohols.
[0088] 3. Methane production stage
[0089] After the amount of leachate produced by the CFmLBR reactor 2 reaches the requirement, the methanogenic stage is started. The leachate first enters the first regulating tank 2.11 for storage and regulation to prevent the overload of the CSTBR reactor 3 from affecting the enrichment of microorganisms. The leachate in the first regulating tank 2.11 passes through the third sewage pump 2.12, the second valve 2.13 and the third electromagnetic flowmeter 2.14 to the second feed port 3.1, and is evenly mixed under the action of the axial flow agitator 3.2 and the CSTBR reactor 3's own hydraulics. When the leachate rises, it will produce methane and enrich microorganisms in the suspended filter material 3.3. Methane-producing microorganisms can be enriched on the suspended filler 3.3, which increases the rate of methanogenesis. At the same time, the CSTBR reactor 3 is equipped with a three-phase separator 3.5 to achieve effective separation of gas, liquid and solid phases to retain the content of microorganisms to the greatest extent. The single-phase circulation of the CSTBR reactor 3 is realized through the second regulating tank 3.26 and the fourth sewage pump 3.11. Part of the leachate entering the CSTBR reactor 3 will enter the sludge storage tank 3.6, and the leachate in the second regulating tank 3.26 will enter the dosing room 3.29 through the fifth sewage pump 3.13 to adjust the pH of the leachate. The leachate in the dosing room will be sprayed into the CFmLBR reactor 2 by the sprinkler head 2.3 through the sixth sewage pump 3.16, thereby making the system enter the cross-circulation mode of the CFmLBR reactor 2 and the CSTBR reactor 3.
[0090] 4 Monitoring measures
[0091] Each pH sensor is used to monitor pH changes; each electromagnetic flow meter is used to measure flow and control flow changes; each probe-type contact thermometer is used to observe temperature changes to ensure that the anaerobic reaction in the reactor is within a suitable range; each gas analyzer can realize online monitoring of generated gas and methane production.
[0092] The first insulation layer 2.10 and the second insulation layer 3.4 should ensure that the medium temperature of 35°C to 40°C or the high temperature of 55°C to 58°C required by the anaerobic digestion microbial reaction is met.
[0093] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0094] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.
Claims
1. A FmLBR-CSTBR two-phase anaerobic digestion system, characterized in that: include: An FmLBR reactor (2), wherein the FmLBR reactor (2) is used to carry out an acidification reaction on the material to produce a leachate, and a discharge port (2.5) is provided at the bottom of the FmLBR reactor (2); A CSTBR reactor (3), wherein a second feed port (3.1) on the CSTBR reactor (3) is connected to the discharge port (2.5), and a suspended filter material (3.3) is arranged in the CSTBR reactor (3); A stirring mechanism (2.2), the stirring mechanism (2.2) comprising a driving assembly arranged on the FmLBR reactor (2), the output end of the driving assembly being fixedly connected to a rotating shaft (4), the rotating shaft (4) extending into the FmLBR reactor (2) and being circumferentially provided with a plurality of turbine stirrers, the bottom of the rotating shaft (4) being fixedly connected to a conical cover (5), the large diameter end of the conical cover (5) being open and in sliding contact with the inner bottom wall of the FmLBR reactor (2), the conical cover (5) being arranged above the discharge port (2.5), and the side wall of the conical cover (5) being circumferentially provided with a plurality of percolation holes (6).
2. The FmLBR-CSTBR two-phase anaerobic digestion system according to claim 1, characterized in that: The rotating shaft (4) is provided with a collar (7) on its outer sleeve, and a plurality of stirring plates (8) are fixedly connected to the circumferential side wall of the collar (7). The plurality of stirring plates (8) are arranged around the conical cover (5) and are in contact with the outer side wall of the conical cover (5).
3. The FmLBR-CSTBR two-phase anaerobic digestion system according to claim 2, characterized in that: The collar (7) is rotatably connected to the rotating shaft (4); a plurality of limit blocks (9) are fixedly connected to the side wall of the rotating shaft (4); a plurality of limit grooves (10) are provided on the inner wall of the collar (7); the limit blocks (9) are slidably connected to the limit grooves (10); springs (11) are respectively fixedly connected to the two opposite side walls of the limit block (9); and the other end of the spring (11) is fixedly connected to the side wall of the limit groove (10).
4. The FmLBR-CSTBR two-phase anaerobic digestion system according to claim 1, characterized in that: The turbine agitator comprises a turbine motor (12) fixedly connected to the side wall of the rotating shaft (4); a connecting rod (13) is arranged on the output shaft of the turbine motor (12); a plurality of turbine discs (14) are fixedly sleeved outside the connecting rod (13); and a plurality of stirring blades (15) are circumferentially fixedly connected to the turbine disc (14).
5. The FmLBR-CSTBR two-phase anaerobic digestion system according to claim 4, characterized in that: A slide bar (16) is fixedly connected to the output shaft of the turbine motor (12); a rectangular rod (17) is rotatably sleeved outside the slide bar (16); a transmission assembly is provided on the rotating shaft (4) and is transmission-connected to the rectangular rod (17); the transmission assembly is used to drive the rectangular rod (17) to rotate, and the rotation direction of the rectangular rod (17) is opposite to that of the slide bar (16); A rectangular groove (20) is formed at one end of the connecting rod (13) close to the turbine motor (12), and a threaded groove (18) is formed at one end of the rectangular groove (20) away from the turbine motor (12). A threaded rod (19) is fixedly connected to the end of the sliding rod (16), and the threaded rod (19) passes through the rectangular groove (20) and is threadedly connected to the threaded groove (18). The rectangular rod (17) is slidably connected to the rectangular groove (20).
6. The FmLBR-CSTBR two-phase anaerobic digestion system according to claim 5, characterized in that: The transmission assembly comprises a first gear (21) fixedly sleeved outside the rotating shaft (4), the first gear (21) being meshed with a second gear (22), the second gear (22) being rotatably connected to the side wall of the rotating shaft (4), a cover shell (23) being fixedly connected to the side wall of the rotating shaft (4), an annular cylinder (24) being rotatably connected to the cover shell (23), the first gear (21) and the second gear (22) being located inside the annular cylinder (24), a tooth groove being provided on the inner side wall of the annular cylinder (24), the second gear (22) being meshed with the tooth groove, and the annular cylinder (24) being fixedly connected to the rectangular rod (17).
7. The FmLBR-CSTBR two-phase anaerobic digestion system according to claim 1, characterized in that: The discharge port (2.5) is connected to a first regulating tank (2.11) via a second sewage pump (2.6); the water outlet of the first regulating tank (2.11) is connected to the second feed port (3.1) via a third sewage pump (2.12); a sixth sewage pump (3.16) is connected between the second sewage pump (2.6) and the first regulating tank (2.11) via a first connecting pipe; the discharge end of the sixth sewage pump (3.16) extends into the FmLBR reactor (2) and is connected to a spray head (2.3); the spray head (2.3) is located above the FmLBR reactor (2).
8. The FmLBR-CSTBR two-phase anaerobic digestion system according to claim 7, characterized in that: The CSTBR reactor (3) is provided with an axial flow agitator (3.2), and the bottom stirring paddle on the axial flow agitator (3.2) penetrates the suspended filter material (3.3) and extends into the bottom of the CSTBR reactor (3); the second feed inlet (3.1) is located at the bottom of the side wall of the CSTBR reactor (3); and a three-phase separator (3.5) is provided in the CSTBR reactor (3), and the three-phase separator (3.5) is located above the suspended filter material (3.3).
9. The FmLBR-CSTBR two-phase anaerobic digestion system according to claim 8, characterized in that: A liquid outlet (3.8) is provided on the side wall of the CSTBR reactor (3), and the liquid outlet (3.8) is located above the three-phase separator (3.5); a second regulating tank (3.26) is provided between the liquid outlet (3.8) and the second feed port (3.1), and the second regulating tank (3.26) is located at the discharge end of the third sewage pump (2.12); a fourth sewage pump (3.11) is provided between the second regulating tank (3.26) and the second feed port (3.1); a dosing room (3.29) is provided between the second regulating tank (3.26) and the first connecting pipe, and the dosing room (3.29) is located at the feed end of the sixth sewage pump (3.16); a fifth sewage pump (3.13) is provided between the dosing room (3.29) and the second regulating tank (3.26).
10. The FmLBR-CSTBR two-phase anaerobic digestion system according to claim 1, characterized in that: The bottom of the CSTBR reactor (3) is a conical bottom, and the conical bottom of the CSTBR reactor (3) is connected to a sludge storage tank (3.30). The discharge end of the sludge storage tank (3.30) is connected to a storage bin (1) through a sludge pump (3.19), and the bottom of the side wall of the storage bin (1) is connected to the first feed port (2.1) at the top of the FmLBR reactor (2) through a first sewage pump (1.2).