An apparatus and method for promoting the production of medium-chain fatty acids by anaerobic microorganisms

Abstract

The present invention discloses a device and method for promoting the production of medium-chain fatty acids by anaerobic microorganisms. The device includes a device body, a sludge treatment chamber, an anaerobic microorganism chamber, a medium-chain fatty acid production chamber, and auxiliary components. The device body includes a housing, a rotating shaft is rotatably connected in the housing, a hollow groove is provided in the rotating shaft, an upper cover is installed on the housing, and a feed port is installed on the upper cover; the sludge treatment chamber includes a first sieve plate and a second sieve plate. The device provided by the present invention is an integrated device, in which all processes from sludge to medium-chain fatty acids can be completed, thereby simplifying the equipment for preparing medium-chain fatty acids, making the equipment occupy a smaller area, and reducing the procurement cost and use cost of the equipment, thereby reducing the cost of preparing medium-chain fatty acids. It has significant significance in the treatment of sludge, realizes resource recycling, effectively curbs the pollution of sludge to the environment, and has great promotion value.

Description

Technical Field

[0001] The present invention belongs to the technical field of medium-chain fatty acid preparation, and in particular relates to a device and a method for promoting anaerobic microorganisms to produce medium-chain fatty acids. Background Art

[0002] In recent years, the technology of using anaerobic microorganisms to produce medium-chain fatty acids from gas has attracted great attention. It can not only produce medium-chain fatty acids quickly and with high selectivity, but also has the advantages of high specificity and mild reaction conditions, which helps to alleviate the pollution of organic waste to the environment. Therefore, the technology of using gas as a production raw material to produce medium-chain fatty acids through anaerobic microorganisms has excellent development prospects. Microbial carbon chain extension is a new biotechnology with low energy consumption and low operating costs. The medium-chain fatty acids produced in this process are a resource with high economic value. It can achieve resource recycling and removal of organic pollutants at the same time. Microbial carbon chain extension is a process in which two carbon atoms are added in each cycle under the action of functional microorganisms to synthesize medium-chain fatty acids from short-chain fatty acids.

[0003] Anaerobic microorganisms need to go through two processes, fermentation and carbon chain elongation, when producing medium-chain fatty acids. During the fermentation process, the long cycle increases the cost of preparing medium-chain fatty acids. At the same time, the different processes of existing anaerobic microorganisms producing medium-chain fatty acids are completed in different equipment, and the equipment used is complicated, resulting in a large footprint of the equipment for producing medium-chain fatty acids and a high cost of use.

[0004] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide an apparatus and method for promoting the production of medium-chain fatty acids by anaerobic microorganisms, which can solve the problems of long production cycles of medium-chain fatty acids by anaerobic microorganisms and high costs caused by complex equipment.

[0006] In order to achieve the above object, a specific embodiment of the present invention provides the following technical solutions:

[0007] A device for promoting anaerobic microorganisms to produce medium-chain fatty acids, comprising:

[0008] The equipment body includes a shell, which is the main body of the equipment for anaerobic microorganisms to produce medium-chain fatty acids. All processes of anaerobic microorganisms producing medium-chain fatty acids can be realized in the shell; a rotating shaft is rotatably connected in the shell, and the rotation of the rotating shaft drives the rotating parts in the shell to rotate; a hollow groove is opened in the rotating shaft, and the anaerobic microorganisms need to be aerated, and the gas required for aeration can be transported through the hollow groove; an upper cover is installed on the shell, and the upper cover is set to be detachable, so that the upper end of the shell is easy to open, so that the parts in the shell are easy to maintain and replace during use; a feed port is installed on the upper cover, and the anaerobic microorganisms come from the sludge, so the collected sludge is added to the shell through the feed port for treatment, and finally the anaerobic microorganisms in the sludge produce medium-chain fatty acids.

[0009] The sludge treatment chamber includes a first sieve plate and a second sieve plate. Since the sludge usually contains solid particles and metal impurities, which affect the efficiency of anaerobic microorganisms in the sludge to produce medium-chain fatty acids, in order to facilitate the filtration of impurities in the sludge, a first sieve plate and a second sieve plate are provided to filter the sludge; the first sieve plate is installed in the shell so that the sludge entering the shell can be filtered through the first sieve plate; a pair of first stirring impellers are installed on the side wall of the rotating shaft, and the pair of the first stirring impellers are installed above the first sieve plate. Since the sludge has a certain viscosity and there will be agglomeration, it will affect the first The efficiency of sludge treatment by one sieve plate is improved, so a first stirring impeller is provided, and the rotating shaft drives the first stirring impeller to rotate, so that the sludge on the first sieve plate can be crushed by stirring through the first stirring impeller, thereby improving the efficiency of the first stirring impeller in treating the sludge; the second sieve plate is installed in the feed port, so that the sludge can be treated first through the second sieve plate, so that larger solid particles can be filtered through the second sieve plate, and at the same time, since the second sieve plate is installed in the feed port, the filtered impurities are easy to clean, so that the impurities filtered through the first sieve plate are less, and the frequency of cleaning impurities on the first sieve plate is reduced.

[0010] The anaerobic microorganism chamber includes a partition plate. Since the sludge needs to be treated by aeration so that the anaerobic microorganisms in the sludge are in an anaerobic environment, after the impurities in the sludge are treated in the sludge treatment chamber, the sludge is aerated and heated in the anaerobic microorganism chamber, thereby inhibiting the activity of methanogens in the sludge and obtaining anaerobic sludge containing anaerobic acid-producing microorganisms. The partition plate is installed in the shell so that the sludge treated in the sludge treatment chamber is intercepted by the partition plate, so that the sludge can be anaerobically treated in the anaerobic microorganism chamber; a plurality of third stirring impellers are installed on the side wall of the rotating shaft. Since the rotating shaft can drive the third stirring impeller to rotate, the third stirring impeller can stir and mix the sludge in the anaerobic microorganism chamber; a plurality of spray guns are installed at the bottom of each of the plurality of third stirring impellers, which release gas into the sludge through the spray guns to aerate and acclimate the sludge. Since the spray guns can rotate with the third stirring impellers, the contact between the gas and the sludge is more uniform, greatly improving the efficiency of the anaerobic treatment of the sludge.

[0011] The medium-chain fatty acid production chamber includes a fourth stirring impeller, which is provided with a pair and installed on the side wall of the rotating shaft. The bottom of the pair of fourth stirring impellers is installed with an electrode plate. Anaerobic sludge enters the medium-chain fatty acid production chamber, and medium-chain fatty acids are produced by anaerobic organisms in the medium-chain fatty acid production chamber. In order to improve the efficiency of anaerobic microorganisms in producing medium-chain fatty acids, an external electric potential is provided to the anaerobic microorganisms by providing an electrode plate, so as to promote the production of medium-chain fatty acids by anaerobic microorganisms through the action of the external electric potential. At the same time, since the electrode plate can be driven to rotate under the action of the fourth stirring impeller, the external electric potential can be in more comprehensive contact with the anaerobic microorganisms, thereby improving the external potential to enhance the production of medium-chain fatty acids by anaerobic microorganisms.

[0012] The auxiliary components include a sampling tube and a temperature sensor. A pair of the sampling tube and the temperature sensor are provided. The sludge in the anaerobic microorganism chamber and the medium-chain fatty acid production chamber can be sampled and tested respectively through the pair of sampling tubes. The ambient temperature of the anaerobic microorganisms in the anaerobic microorganism chamber and the medium-chain fatty acid production chamber can be tested respectively through the pair of temperature sensors.

[0013] In one or more embodiments of the present invention, a first bearing is mounted on the sidewall of the rotating shaft, facilitating gas delivery into the hollow groove on the rotating shaft. The first bearing comprises an outer ring and an inner ring. A delivery pipe is mounted on the outer sidewall of the outer ring for introducing gas. One end of the delivery pipe is fixedly connected to the outer ring, allowing gas delivered by the delivery pipe to be delivered through the outer ring into the first bearing. A feed pipe is mounted on the sidewall of the delivery pipe, located on the outer side of the housing, for introducing an exogenous medium into the gas. The exogenous medium is then transported to the sludge through the gas, where it mixes with the sludge and comes into contact with the anaerobic microorganisms, thereby enhancing the production of medium-chain fatty acids by the anaerobic microorganisms. Air inlets are formed in the sidewalls of the inner ring and the rotating shaft, communicating with the hollow groove. Gas delivered to the first bearing by the outer ring can then be transported through the air inlet into the hollow groove, allowing gas to be delivered through the hollow groove. Preferably, since the gas has a certain temperature, the first bearing should be made of a high-temperature resistant material so that the gas will not affect the normal use of the first bearing when it is transported through the first bearing.

[0014] In one or more embodiments of the present invention, a drive motor is mounted on the upper end of the rotating shaft, which is used to drive the rotating shaft to rotate, thereby driving the rotating components within the housing to rotate. A second bearing is mounted on the bottom wall of the housing, and the lower end of the rotating shaft is sleeved within the second bearing, ensuring that the rotating shaft has good stability while rotating within the housing, thereby ensuring stability when the rotating shaft drives the rotating components to rotate. A discharge port is mounted on the lower end of the bottom wall of the housing. When the anaerobic microorganisms in the sludge complete the conversion of medium-chain fatty acids within the housing, the waste is discharged from the housing through the discharge port.

[0015] In one or more embodiments of the present invention, the mesh size of the first sieve plate is 7-35 mesh, so that the particle size of the sludge after screening by the first sieve plate is smaller, thereby reducing the particle size of the anaerobic sludge and promoting the efficiency of anaerobic microbial fatty acid production. The mesh size of the second sieve plate is 3-5 mesh, and the second sieve plate is used to filter out larger impurities in the sludge, thereby reducing the impurities filtered by the first sieve plate.

[0016] In one or more embodiments of the present invention, a plurality of first crushing knives are fixedly connected to the front and rear side walls of the first stirring impeller in a longitudinal manner. When the first screen plate screens and filters the sludge, the sludge may clump, thereby affecting the filtration efficiency. Therefore, in order to improve the filtration efficiency, the agglomerated sludge can be broken up and filtered. By arranging the first crushing knives on the front and rear side walls of the first stirring impeller, when the first stirring impeller drives the first crushing knives to rotate, the agglomerated sludge can be broken up by the first crushing knives, so as to break up the agglomerated sludge. The front and rear side walls of the first stirring impeller are fixedly connected to the magnetic plates in a transverse manner. Since the sludge contains metal impurities, in order to facilitate the filtration of the metal impurities in the sludge, the first stirring impeller drives the magnetic plates to rotate, so that the metal impurities in the sludge can be adsorbed by the magnetic plates, thereby achieving filtration of the metal impurities. A first circulation groove is provided in the first stirring impeller, and the first circulation groove is connected to the first crushing knife, so that the gas transported in the first crushing knife can flow into the first circulation groove; a plurality of first nozzles are provided on the bottom wall of the first circulation groove, and the gas flowing into the first circulation groove can be ejected through the first nozzle. Preferably, when the sludge on the first sieve plate is stirred by the first stirring impeller, the filtration efficiency of the sludge can be effectively improved. At the same time, since the sludge has poor fluidity when being filtered on the first sieve plate, there is a problem of clogging the filter holes on the first sieve plate. The gas ejected by the first nozzle can purge the filter holes on the first sieve plate, solving the problem of filter hole clogging. At the same time, when the gas is ejected, it can come into contact with the sludge, so as to achieve the dredging of the filter holes and aeration of the sludge at the same time, so that the sludge is in an anaerobic environment.

[0017] In one or more embodiments of the present invention, a pair of second stirring impellers are fixedly connected to the sidewalls of the rotating shaft. The second stirring impellers are disposed on the second sieve plate. To improve the filtration efficiency of the sludge on the second sieve plate, when the second stirring impellers are driven by the rotating shaft to rotate, the second stirring impellers can stir the sludge on the second sieve plate, thereby effectively improving the filtration efficiency of the sludge on the second sieve plate. A plurality of second crushing blades are fixedly connected to the front and rear sidewalls of the second stirring impeller in a longitudinal manner. When the second stirring impellers rotate, they can drive the second crushing blades to rotate, so that the second crushing blades can crush and break up the sludge, thereby further improving the filtration efficiency of the sludge on the second sieve plate. A sewage outlet is provided on the sidewalls of the housing. The bottom of the sewage outlet is flush with the upper surface of the first sieve plate. When the first sieve plate filters the sludge, it intercepts impurities such as solid particles. Therefore, in order to facilitate regular cleaning of the intercepted impurities, a sewage outlet is provided. By opening the sewage outlet, the impurities intercepted by the first sieve plate can be discharged through the sewage outlet under the rotation of the first stirring impeller.

[0018] In one or more embodiments of the present invention, a second flow groove is provided in the third stirring impeller, and the second flow groove is connected to the hollow groove so that the gas transported in the hollow groove can enter the second flow groove. The plurality of spray guns are all connected to the second flow groove so that the gas transported in the second flow groove can be discharged through the spray gun. The lower end of the spray gun is provided with a plurality of second nozzles. In order to disperse the gas discharged from the spray gun, a plurality of second nozzles are provided to spray the gas in the spray gun. The plurality of second nozzles are all tilted outward. In order to further increase the range of the second nozzle for gas injection, the second nozzle is set in an inclined manner. A discharge port is installed at the bottom of the partition plate. When the sludge completes anaerobic treatment in the anaerobic microbial chamber, the sludge will be discharged through the discharge port. Preferably, in order to increase the range of the second nozzle for gas injection and make the gas be injected more evenly, so as to improve the contact effect between the gas and the sludge, the inclination angle of the second nozzle relative to the central axis of the spray gun is set to 30 to 60 degrees, and the inclination angle is preferably 45 degrees.

[0019] In one or more embodiments of the present invention, a conductive bearing is mounted on the rotating shaft, the conductive bearing being mounted at the lower end of the electrode plate, and the electrode plate and the conductive bearing are electrically connected. Since the electrode plate rotates along with the rotating shaft during use, to facilitate the provision of power to the electrode plate, the conductive bearing is provided so that the conductive bearing is not affected by the rotation of the rotating shaft, thereby facilitating connection of power to the conductive bearing. The power is then supplied to the electrode plate via the conductive bearing, allowing the applied potential provided by the electrode plate to contact the anaerobic microorganisms.

[0020] A method for promoting anaerobic microorganisms to produce medium-chain fatty acids, the method comprising:

[0021] Step 1: Put the sludge into the shell and pre-treat the sludge through the sludge treatment chamber; after the sludge enters the shell, it will be screened and filtered by the second sieve plate and the first sieve plate respectively, so as to filter out larger solid particles and metal impurities in the sludge, so that the particle size of the particles in the treated sludge is smaller, and at the same time, the impact of impurities on the production of medium-chain fatty acids by anaerobic microorganisms is reduced, thereby effectively promoting the production of medium-chain fatty acids by anaerobic microorganisms.

[0022] Step 2: The pretreated sludge enters the anaerobic microorganism chamber, and the sludge is aerated and acclimated to obtain anaerobic sludge containing anaerobic acid-producing microorganisms; at the same time, an exogenous medium is added to the sludge in the anaerobic microorganism chamber so that the anaerobic sludge and the exogenous medium are evenly mixed; the sludge is aerated by gas, thereby effectively inhibiting the activity of methanogens in the sludge, and obtaining anaerobic sludge containing anaerobic acid-producing microorganisms.

[0023] Step 3: The anaerobic sludge enters the medium-chain fatty acid production chamber, and an external potential is provided to the anaerobic sludge through the electrode plate, which promotes the production of medium-chain fatty acids by anaerobic microorganisms under the action of the exogenous medium and the external potential.

[0024] In one or more embodiments of the present invention, the temperature of the gas is controlled at 100-110° C., the aeration treatment time is 1-1.5 hours, and the potential provided by the electrode plate is -0.4-0.8V.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] The device provided by the present invention pre-treats sludge in a sludge treatment chamber, aerates and heats the pre-treated sludge in an anaerobic microorganism chamber to obtain anaerobic sludge containing anaerobic acid-producing microorganisms, and then in a medium-chain fatty acid production chamber, the anaerobic sludge is enhanced by applying an external potential and an exogenous medium, thereby effectively promoting the production of medium-chain fatty acids by anaerobic microorganisms.

[0027] The device provided by the present invention is provided with a rotating shaft, which drives different stirring impellers to rotate. The stirring of the stirring impellers effectively improves the efficiency of sludge pretreatment, the efficiency of sludge aeration treatment, and the efficiency of anaerobic microbial production of medium-chain fatty acids, thereby shortening the medium-chain fatty acid production cycle and improving the conversion rate of medium-chain fatty acids produced by anaerobic microorganisms, thereby greatly reducing the cost of medium-chain fatty acid preparation.

[0028] The equipment provided by the present invention is an integrated equipment, in which all processes from sludge to medium-chain fatty acids can be completed, thereby simplifying the equipment for preparing medium-chain fatty acids, making the equipment occupy a smaller area, and at the same time reducing the procurement cost and use cost of the equipment, thereby reducing the cost of preparing medium-chain fatty acids. It has significant significance in the treatment of sludge, realizes resource recycling, effectively curbs the pollution of sludge to the environment, and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a front view of a device for promoting the production of medium-chain fatty acids by anaerobic microorganisms according to an embodiment of the present invention;

[0031] Figure 2 This is a perspective view of a device for promoting the production of medium-chain fatty acids by anaerobic microorganisms in one embodiment of the present invention;

[0032] Figure 3 This is a cross-sectional view of a device for promoting the production of medium-chain fatty acids by anaerobic microorganisms in one embodiment of the present invention;

[0033] Figure 4 This is a cross-sectional view of an apparatus for promoting the production of medium-chain fatty acids by anaerobic microorganisms according to one embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the interior of a device for promoting the production of medium-chain fatty acids by anaerobic microorganisms according to an embodiment of the present invention;

[0035] Figure 6 In one embodiment of the present invention Figure 3 Schematic diagram at A in the middle;

[0036] Figure 7 In one embodiment of the present invention Figure 4 Schematic diagram at B in the middle;

[0037] Figure 8 In one embodiment of the present invention Figure 5 Schematic diagram at point C in the middle.

[0038] Description of main reference numerals:

[0039] 1- Equipment body, 11- Shell, 12- Rotating shaft, 13- Hollow groove, 14- First bearing, 1401- Outer ring, 1402- Inner ring, 15- Conveying pipe, 16- Conveying pipe, 17- Upper cover, 18- Feed inlet, 19- Drive motor, 110- Second bearing, 111- Discharge port, 2- Sludge treatment chamber, 21- First sieve plate, 22- First stirring impeller, 23- First crushing knife, 24- Magnetic plate, 25- First circulation slot, 26- First nozzle, 27- Third axis Bearing, 28-second sieve plate, 29-second stirring impeller, 210-second crushing knife, 211-fourth bearing, 212-drain outlet, 3-anaerobic microorganism chamber, 31-partition plate, 32-fifth bearing, 33-third stirring impeller, 34-second circulation groove, 35-spray gun, 36-second nozzle, 37-discharge port, 4-medium-chain fatty acid production chamber, 41-fourth stirring impeller, 42-electrode plate, 43-conductive bearing, 5-auxiliary components, 51-sampling tube, 52-temperature sensor. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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 making creative efforts should fall within the scope of protection of the present invention.

[0041] like Figures 1 to 4 As shown, an apparatus for promoting anaerobic microorganisms to produce medium-chain fatty acids in one embodiment of the present invention includes an apparatus body 1 , a sludge treatment chamber 2 , an anaerobic microorganism chamber 3 , a medium-chain fatty acid production chamber 4 and an auxiliary component 5 .

[0042] like Figures 1 to 4 As shown, the equipment body 1 includes a shell 11, which is the main body of the equipment for anaerobic microorganisms to produce medium-chain fatty acids. All processes of anaerobic microorganisms to produce medium-chain fatty acids can be realized in the shell 11; a rotating shaft 12 is rotatably connected in the shell 11, and the rotation of the rotating shaft 12 drives the rotating parts in the shell 11 to rotate; a hollow groove 13 is opened in the rotating shaft 12, and the anaerobic microorganisms need to be aerated, and the gas required for aeration can be transported through the hollow groove 13; an upper cover plate 17 is installed on the shell 11, and the upper cover plate 17 is set to be detachable, so that the upper end of the shell 11 is easy to open, so that the parts in the shell 11 are easy to maintain and replace during use; a feed port 18 is installed on the upper cover plate 17, and the anaerobic microorganisms come from the sludge, so the collected sludge is added to the shell 11 through the feed port 18 for treatment, and finally the anaerobic microorganisms in the sludge produce medium-chain fatty acids.

[0043] like Figure 3 Combine Figure 6As shown, a first bearing 14 is mounted on the sidewall of the rotating shaft 12. This facilitates the delivery of gas for aerating the sludge into the hollow groove 13 on the rotating shaft 12. The first bearing 14 comprises an outer ring 1401 and an inner ring 1402. A delivery pipe 15 is mounted on the outer sidewall of the outer ring 1401. This delivery pipe 15 is used to introduce gas. One end of the delivery pipe 15 is fixedly connected to the outer ring 1401, allowing the gas delivered by the delivery pipe 15 to pass through the outer ring 1401 and into the first bearing 14. A feed pipe 16 is mounted on the sidewall of the delivery pipe 15, located on one end of the outer side of the housing 11. This feed pipe 16 is used to introduce an exogenous medium into the gas, allowing the exogenous medium to be transported to the sludge through the gas, mixing with the sludge and thereby contacting the anaerobic microorganisms. This exogenous medium enhances the production of medium-chain fatty acids by the anaerobic microorganisms. Air inlet holes are provided on the side walls of the inner ring 1402 and the side walls of the rotating shaft 12, and the air inlet holes are connected to the hollow groove 13. The gas transported to the first bearing 14 by the outer ring 1401 can be transported to the hollow groove 13 through the air inlet holes, so that the gas can be transported through the hollow groove 13.

[0044] Preferably, since the gas has a certain temperature, the first bearing 14 should be made of a high-temperature resistant material so that the gas will not affect the normal use of the first bearing 14 when it is transported through the first bearing 14 .

[0045] like Figures 1 to 4 As shown, a drive motor 19 is mounted on the upper end of the rotating shaft 12. Drive motor 19 is used to drive the rotating shaft 12 to rotate, thereby driving the rotating components within the housing 11 to rotate through the rotating shaft 12. A second bearing 110 is mounted on the bottom wall of the housing 11. The lower end of the rotating shaft 12 is sleeved within the second bearing 110, ensuring good stability while the rotating shaft 12 rotates within the housing 11. A discharge port 111 is mounted on the lower end of the bottom wall of the housing 11. When the anaerobic microorganisms in the sludge complete the conversion of medium-chain fatty acids within the housing 11, the waste is discharged from the housing 11 through the discharge port 111.

[0046] like Figures 3 to 5 As shown, the sludge treatment chamber 2 includes a first sieve plate 21 and a second sieve plate 28. Since the sludge usually contains solid particles and metal impurities, which affect the efficiency of anaerobic microorganisms in the sludge in producing medium-chain fatty acids, in order to facilitate the filtration of impurities in the sludge, the first sieve plate 21 and the second sieve plate 28 are provided to filter the sludge.

[0047] Specifically, the first sieve plate 21 is installed in the housing 11 so that the sludge entering the housing 11 can be filtered through the first sieve plate 21; a pair of first stirring impellers 22 are installed on the side wall of the rotating shaft 12, and the pair of first stirring impellers 22 are installed above the first sieve plate 21. Since the sludge has a certain viscosity and there will be agglomeration, it will affect the efficiency of the first sieve plate 21 in treating the sludge. Therefore, by providing the first stirring impeller 22, the rotating shaft 12 will drive the first stirring impeller 22 to rotate, so that the sludge can be filtered through the first sieve plate 21. The sludge on the first sieve plate 21 is broken by stirring through the first stirring impeller 22, thereby improving the efficiency of the first stirring impeller 22 in treating the sludge; the second sieve plate 28 is installed in the feed port 18 so that the sludge can be pre-treated by the second sieve plate 28, so that larger solid particles can be filtered through the second sieve plate 28. At the same time, since the second sieve plate 28 is installed in the feed port 18, the filtered impurities are easy to clean, so that less impurities are filtered through the first sieve plate 21, and the frequency of cleaning impurities on the first sieve plate 21 is reduced.

[0048] Preferably, the mesh size of the first sieve plate 21 is 7-35 mesh. This allows the sludge to have a smaller particle size after being sieved by the first sieve plate 21, resulting in a smaller particle size in the anaerobic sludge, which can promote the efficiency of anaerobic microbial fatty acid production. The mesh size of the second sieve plate 28 is 3-5 mesh. The second sieve plate 28 filters out larger impurities in the sludge, thereby reducing the impurities filtered by the first sieve plate 21.

[0049] like Figure 5 Combine Figure 8 As shown, a plurality of first crushing knives 23 are fixedly connected to the front and rear side walls of the first stirring impeller 22 in a longitudinal manner. When the first screen plate 21 screens and filters the sludge, the sludge may clump, thereby affecting the filtration efficiency. In order to improve the filtration efficiency and enable the agglomerated sludge to be broken up and filtered, first crushing knives 23 are provided on the front and rear side walls of the first stirring impeller 22. When the first stirring impeller 22 drives the first crushing knives 23 to rotate, the agglomerated sludge can be broken up by the first crushing knives 23, so as to break up the agglomerated sludge. A magnetic plate 24 is fixedly connected to the front and rear side walls of the first stirring impeller 22 in a transverse manner. Since the sludge contains metal impurities, in order to facilitate the filtration of the metal impurities in the sludge, the first stirring impeller 22 drives the magnetic plate 24 to rotate, so that the metal impurities in the sludge can be adsorbed by the magnetic plate 24, thereby achieving filtration of the metal impurities.

[0050] Furthermore, a first circulation groove 25 is provided in the first stirring impeller 22, and the first circulation groove 25 is connected to the first crushing knife 23, so that the gas transported in the first crushing knife 23 can flow into the first circulation groove 25; a plurality of first nozzles 26 are provided on the bottom wall panel of the first circulation groove 25, and the gas flowing into the first circulation groove 25 can be sprayed out through the first nozzles 26.

[0051] Preferably, the first stirring impeller 22 agitates the sludge on the first sieve plate 21, effectively improving the filtration efficiency of the sludge. Furthermore, since the sludge has poor fluidity when filtered on the first sieve plate 21, it may clog the filter holes on the first sieve plate 21. The gas ejected from the first nozzle 26 can purge the filter holes on the first sieve plate 21, thereby resolving the clogged filter holes problem. Furthermore, the gas can come into contact with the sludge during ejection, thereby clearing the filter holes and aerating the sludge, thereby maintaining an anaerobic environment.

[0052] like Figure 5 Combine Figure 8 As shown, a pair of second stirring impellers 29 are fixedly connected to the side walls of the rotating shaft 12. The pair of second stirring impellers 29 are arranged on the second sieve plate 28. In order to improve the filtration efficiency of the sludge on the second sieve plate 28, when the pair of second stirring impellers 29 are driven by the rotating shaft 12 to rotate, the pair of second stirring impellers 29 can stir the sludge on the second sieve plate 28, thereby effectively improving the filtration efficiency of the sludge on the second sieve plate 28. A plurality of second crushing knives 210 are fixedly connected to the front and rear side walls of the second stirring impeller 29 in a longitudinal manner. When the second stirring impeller 29 rotates, it can drive the second crushing knives 210 to rotate, so that the second crushing knives 210 can crush and disperse the sludge, thereby further improving the filtration efficiency of the sludge on the second sieve plate 28.

[0053] Optionally, a magnetic plate may be provided on the side wall of the second stirring impeller 29 to filter metal impurities in the sludge.

[0054] like Figure 2 and Figure 4 As shown, a sewage outlet 212 is provided on the side wall of the shell 11, and the bottom of the sewage outlet 212 is flush with the upper surface of the first sieve plate 21. When the first sieve plate 21 filters the sludge, it will intercept impurities such as solid particles. Therefore, in order to facilitate regular cleaning of the intercepted impurities, a sewage outlet 212 is provided. When the sewage outlet 212 is opened, the impurities intercepted by the first sieve plate 21 can be discharged through the sewage outlet 212 under the rotation of the first stirring impeller 22.

[0055] like Figure 3 and Figure 4As shown, the anaerobic microorganism chamber 3 includes a partition plate 31. Since the sludge needs to be treated by aeration so that the anaerobic microorganisms in the sludge are in an anaerobic environment, after the impurities in the sludge are treated by the sludge treatment chamber 2, the sludge is aerated and heated in the anaerobic microorganism chamber 3, thereby inhibiting the activity of methanogens in the sludge and obtaining anaerobic sludge containing anaerobic acid-producing microorganisms. The partition plate 31 is installed in the shell 11, so that the sludge treated by the sludge treatment chamber 2 is intercepted by the partition plate 31, so that the sludge can be anaerobically treated in the anaerobic microorganism chamber 3; a plurality of third stirring impellers 33 are installed on the side wall of the rotating shaft 12. Since the rotating shaft 12 can drive the third stirring impellers 33 to rotate, the sludge in the anaerobic microorganism chamber 3 can be stirred and mixed by the third stirring impellers 33; a plurality of spray guns 35 are installed at the bottom of the plurality of third stirring impellers 33, and gas is released into the sludge through the spray guns 35. Since the spray guns 35 can rotate together with the third stirring impellers 33, the contact between the gas and the sludge is more uniform, which greatly improves the efficiency of the anaerobic treatment of the sludge.

[0056] like Figure 4 Combine Figure 7 As shown, a second circulation groove 34 is provided in the third stirring impeller 33, and the second circulation groove 34 is connected to the hollow groove 13, so that the gas transported in the hollow groove 13 can enter the second circulation groove 34. A plurality of spray guns 35 are connected to the second circulation groove 34, so that the gas transported in the second circulation groove 34 can be discharged through the spray guns 35. A plurality of second nozzles 36 are provided at the lower end of the spray gun 35. In order to disperse the gas discharged from the spray gun 35, a plurality of second nozzles 36 are provided to spray the gas in the spray gun 35. The plurality of second nozzles 36 are all tilted outward. In order to further increase the range of the gas sprayed by the second nozzle 36, the second nozzle 36 is arranged in an inclined manner. A discharge port 37 is installed at the bottom of the partition plate 31. When the sludge completes anaerobic treatment in the anaerobic microorganism chamber 3, the sludge will be discharged through the discharge port 37.

[0057] Preferably, in order to increase the range of gas injection by the second nozzle 36 and make the gas be injected more evenly, so as to improve the contact effect between the gas and the sludge, the inclination angle of the second nozzle 36 relative to the central axis of the spray gun 35 is set to 30~60 degrees, and the inclination angle is preferably 45 degrees.

[0058] It should be noted that since the exogenous medium is transported to the delivery pipe 15 through the feed pipe 16, so as to mix with the gas in the delivery pipe 15 and finally be ejected through the first nozzle 26 and the second nozzle 36, in order to prevent the first nozzle 26 and the second nozzle 36 from causing blockage when transporting the exogenous medium, the exogenous medium needs to be dried and ground to make the particle size of the exogenous medium extremely small, so that the particle size of the exogenous medium is much smaller than the aperture of the first nozzle 26 and the second nozzle 36, so that the gas will not affect the normal use of the equipment when carrying and transporting the exogenous medium.

[0059] At the same time, if Figure 5 Combine Figure 8 As shown, a fourth bearing 211 is installed on the second sieve plate 28, a third bearing 27 is installed on the first sieve plate 21, and a fifth bearing 32 is installed on the partition plate 31. When the rotating shaft 12 is installed, it passes through the fourth bearing 211, the third bearing 27 and the fifth bearing 32 in sequence, so that the rotation of the rotating shaft 12 will not be affected by the second sieve plate 28, the first sieve plate 21 and the partition plate 31.

[0060] like Figures 3 to 5 As shown, the medium-chain fatty acid production chamber 4 includes a fourth stirring impeller 41, and the fourth stirring impeller 41 is provided with a pair and installed on the side wall of the rotating shaft 12. The bottom of the pair of fourth stirring impellers 41 is installed with an electrode plate 42. The anaerobic sludge enters the medium-chain fatty acid production chamber 4, and the medium-chain fatty acids are produced by anaerobic organisms in the medium-chain fatty acid production chamber 4. In order to improve the efficiency of anaerobic microorganisms in producing medium-chain fatty acids, an external potential is provided to the anaerobic microorganisms by providing the electrode plate 42, so as to promote the production of medium-chain fatty acids by anaerobic microorganisms through the action of the external potential. At the same time, since the electrode plate 42 can be driven to rotate under the action of the fourth stirring impeller 41, the external potential can be more comprehensively contacted with the anaerobic microorganisms, thereby improving the external potential to strengthen the production of medium-chain fatty acids by anaerobic microorganisms.

[0061] like Figures 3 to 5 As shown, a conductive bearing 43 is mounted on the rotating shaft 12. The conductive bearing 43 is mounted at the lower end of the electrode plate 42, and the electrode plate 42 and the conductive bearing 43 are electrically connected. Since the electrode plate 42 rotates with the rotating shaft 12 during use, in order to facilitate the supply of power to the electrode plate 42, the conductive bearing 43 is provided so that the conductive bearing 43 is not affected by the rotation of the rotating shaft 12, thereby facilitating the connection of power to the conductive bearing 43. The power is then supplied to the electrode plate 42 through the conductive bearing 43, so that the external potential provided by the electrode plate 42 comes into contact with the anaerobic microorganisms.

[0062] like Figure 3 and Figure 4As shown, the auxiliary component 5 includes a sampling tube 51 and a temperature sensor 52. A pair of the sampling tube 51 and the temperature sensor 52 are provided. The pair of sampling tubes 51 can be used to sample and detect the sludge in the anaerobic microorganism chamber 3 and the medium-chain fatty acid production chamber 4 respectively. The pair of temperature sensors 52 can be used to detect the ambient temperature of the anaerobic microorganisms in the anaerobic microorganism chamber 3 and the medium-chain fatty acid production chamber 4 respectively.

[0063] When in use, the drive motor 19 is started to drive the rotating shaft 12 to rotate, and the sludge is put into the housing 11. The sludge will first be pre-treated in the sludge treatment chamber 2. Specifically, the sludge is rotated by the rotation of the second stirring impeller 29 on the second sieve plate 28, so as to improve the efficiency of sludge filtration. The sludge filtered by the second sieve plate 28 is filtered on the first sieve plate 21. The sludge is rotated by the rotation of the first stirring impeller 22 on the first sieve plate 21, thereby improving the sludge filtration efficiency.

[0064] The pretreated sludge in the sludge treatment chamber 2 enters the anaerobic microorganism chamber 3. The gas transported by the delivery pipe 15 in the anaerobic microorganism chamber 3 is ejected through the second nozzle 36 on the spray gun 35, causing the sludge to come into contact with the gas, thereby aerating and heating the sludge with the gas to obtain anaerobic sludge containing anaerobic acid-producing microorganisms. At the same time, in the later stage of treatment in the sludge treatment chamber 2, the required external medium is transported to the delivery pipe 15 through the feed pipe 16, so that the external medium and the anaerobic sludge are evenly mixed.

[0065] The anaerobic sludge is discharged into the medium-chain fatty acid production chamber 4, where an external potential is provided to the anaerobic sludge through the electrode plate 42, so as to promote anaerobic microorganisms to produce medium-chain fatty acids under the reinforcement of the external potential and the exogenous medium.

[0066] A method for promoting anaerobic microorganisms to produce medium-chain fatty acids, the method comprising:

[0067] Step 1: Put the sludge into the housing 11 and pre-treat the sludge in the sludge treatment chamber 2;

[0068] Specifically, after the sludge enters the shell 11, it will be screened and filtered by the second sieve plate 28 and the first sieve plate 21 respectively, so as to filter out larger solid particles and metal impurities in the sludge, so that the particle size of the particles in the treated sludge is smaller, and at the same time, the impact of impurities on the production of medium-chain fatty acids by anaerobic microorganisms is reduced, thereby effectively promoting the production of medium-chain fatty acids by anaerobic microorganisms.

[0069] Step 2: The pretreated sludge enters the anaerobic microorganism chamber 3, and gas is introduced into the anaerobic microorganism chamber 3. The gas aerates and acclimates the sludge to obtain anaerobic sludge containing anaerobic acid-producing microorganisms; at the same time, an exogenous medium is added to the sludge in the anaerobic microorganism chamber so that the anaerobic sludge and the exogenous medium are evenly mixed.

[0070] Specifically, the sludge is aerated with gas, thereby effectively inhibiting the activity of methanogens in the sludge and obtaining anaerobic sludge containing anaerobic acid-producing microorganisms.

[0071] Specifically, the gas is one or more combinations of hydrogen, carbon monoxide, carbon dioxide and nitrogen, and the combination and proportion can be determined according to the properties of the sludge.

[0072] Step 3: The anaerobic sludge enters the medium-chain fatty acid production chamber 4, and an external potential is provided to the anaerobic sludge through the electrode plate 42, which promotes the production of medium-chain fatty acids by anaerobic microorganisms under the action of the exogenous medium and the external potential.

[0073] In one or more embodiments of the present invention, the temperature of the gas is controlled at 100-110° C., the aeration treatment time is 1-1.5 hours, and the potential provided by the electrode plate 42 is -0.4-0.8V.

[0074] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0075] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A device for promoting the production of medium-chain fatty acids by anaerobic microorganisms, characterized in that: include: The device body includes a shell, a rotating shaft is rotatably connected in the shell, a hollow groove is defined in the rotating shaft, an upper cover is installed on the shell, a feed port is installed on the upper cover, a first bearing is installed on the side wall of the rotating shaft, the first bearing includes an outer ring and an inner ring, a conveying pipe is installed on the outer side wall of the outer ring, a material conveying pipe is installed on the side wall of the conveying pipe located at one end of the outer side of the shell, and an air inlet is defined on the side wall of the inner ring and the side wall of the rotating shaft, and the air inlet is connected to the hollow groove; The sludge treatment chamber comprises a first sieve plate and a second sieve plate, the first sieve plate being installed in the shell, a pair of first stirring impellers being installed on the side wall of the rotating shaft, a pair of the first stirring impellers being installed above the first sieve plate, and the second sieve plate being installed in the feed inlet, a plurality of first crushing knives being fixedly connected to the front and rear side walls of the first stirring impeller in a longitudinal manner, a magnetic attraction plate being fixedly connected to the front and rear side walls of the first stirring impeller in a transverse manner, a first circulation groove being opened in the first stirring impeller, the first circulation groove being connected to the first crushing knife, a plurality of first nozzles being provided on the bottom wall plate of the first circulation groove, a pair of second stirring impellers being fixedly connected to the side wall of the rotating shaft, a pair of second stirring impellers being provided on the second sieve plate, a plurality of second crushing knives being fixedly connected to the front and rear side walls of the second stirring impeller in a longitudinal manner, a sewage outlet being provided on the side wall of the shell, and the bottom of the sewage outlet being flush with the upper surface of the first sieve plate; the sieve hole size on the first sieve plate is 7 to 35 meshes, and the sieve hole size on the second sieve plate is 3 to 5 meshes; An anaerobic microorganism chamber, comprising a partition plate, the partition plate being installed in a shell, a plurality of third stirring impellers being installed on the side wall of the rotating shaft, a plurality of spray guns being installed at the bottom of the plurality of third stirring impellers, a second flow groove being opened in the third stirring impeller, the second flow groove being connected to the hollow groove, a plurality of the spray guns being connected to the second flow groove, a plurality of second nozzles being provided at the lower end of the spray gun, the plurality of second nozzles being inclined outward, the inclination angle of the second nozzle relative to the central axis of the spray gun being set to 30 to 60 degrees, and a discharge port being installed at the bottom of the partition plate; The medium-chain fatty acid production chamber includes a fourth stirring impeller, wherein the fourth stirring impeller is provided in a pair and mounted on the side wall of the rotating shaft, the bottom of each pair of the fourth stirring impellers is mounted with an electrode plate, the rotating shaft is mounted with a conductive bearing, the conductive bearing is mounted on the lower end of the electrode plate, and the electrode plate and the conductive bearing are electrically connected; The auxiliary component includes a sampling tube and a temperature sensor, and each of the sampling tube and the temperature sensor is provided in pair.

2. The device for promoting the production of medium-chain fatty acids by anaerobic microorganisms according to claim 1, characterized in that: The upper end of the rotating shaft is equipped with a driving motor, the bottom wall of the shell is equipped with a second bearing, the lower end of the rotating shaft is sleeved in the second bearing, and the lower end of the bottom wall of the shell is equipped with a discharge port.

3. A method for promoting the production of medium-chain fatty acids by anaerobic microorganisms, used in the device for promoting the production of medium-chain fatty acids by anaerobic microorganisms as claimed in any one of claims 1 and 2, characterized in that: The method comprises: Step 1: Put the sludge into the shell and pre-treat the sludge in the sludge treatment chamber; Step 2: The pretreated sludge enters the anaerobic microorganism chamber, where it is aerated and acclimated to obtain anaerobic sludge containing anaerobic acid-producing microorganisms; at the same time, an exogenous medium is added to the sludge in the anaerobic microorganism chamber to uniformly mix the anaerobic sludge and the exogenous medium; Step 3: The anaerobic sludge enters the medium-chain fatty acid production chamber, and an external potential is provided to the anaerobic sludge through the electrode plate, which promotes the production of medium-chain fatty acids by anaerobic microorganisms under the action of the exogenous medium and the external potential.

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