Liquid manure resourceful treatment process

Abstract

The invention discloses a liquid manure resourceful treatment process which is based on the basic principle of liquid manure fermentation treatment in the prior art, a jet flow stirring assembly is additionally arranged in a fermentation tank, stirring plates synchronously operating on the two sides are used for comprehensively stirring waste liquid, and multi-angle and large-range jet flow actions of a plurality of jet flow pipes are matched; in the suspended matter pretreatment process, water flow with certain pressure serves as a carrier, gas is synchronously introduced, formed gas-dissolved water scours the inner wall of a fermentation tank along with the change of different angles of a jet pipe, the liquidity of waste liquid is enhanced, an air flotation environment is formed in the fermentation tank, and fine impurities in the waste liquid are upwards driven to the liquid level to form an air flotation layer; and in the fermentation treatment process, water flow with certain pressure is also used as a carrier, activated sludge is synchronously introduced, the mixing degree of inoculums and waste liquid is improved in a multi-angle spraying and flushing manner, and meanwhile, the problem that fermentation materials are easily attached to the inner wall of the fermentation tank is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of manure treatment, and more specifically, to a process for resource treatment of liquid manure. Background Art

[0002] Treatment of livestock and poultry manure is a major challenge faced by the livestock and poultry breeding industry, especially in closed livestock and poultry breeding facilities. Livestock and poultry are raised in farms, and it is necessary to remove the accumulated livestock and poultry manure in the farms, including solid and liquid manure, to maintain a healthy living environment. In the prior art, when resource treatment is carried out on manure, most of the manure is subjected to solid-liquid separation, and then the solid manure is subjected to composting treatment, and the liquid manure is subjected to fermentation treatment. Reference can be made to the relevant content in the publication number CN107840528B.

[0003] However, during the fermentation treatment of liquid manure, a large amount of fine colloidal suspended substances still remain in the liquid manure. Even if a stirring structure is configured, the colloidal suspended substances will affect the mixing effect of the inoculum and the liquid manure ferment. In addition, the impurity colloidal suspended substances will generate impurity gases during the anaerobic fermentation of the waste liquid, reducing the purity of the fermented gas. Moreover, generally, the stirring blades only play a role in rotating and mixing the ferment. As the fermentation progresses, the unremoved impurity colloidal suspended substances are likely to cause the ferment to adhere to the inner wall of the container, affecting the fermentation effect. Therefore, in view of the existing practical problems, a process for resource treatment of liquid manure is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a process for resource treatment of liquid manure, which is aimed at a large amount of fine impurities in the liquid manure that are difficult to remove through ordinary solid-liquid separation devices. The colloidal suspended substances formed by the fine impurities will affect the mixing of the inoculum and the liquid manure fermentation broth on the one hand, and will generate impurity gases during the anaerobic fermentation of the waste liquid, reducing the purity of the fermented gas. Secondly, it is also easy to cause the ferment to adhere to the inner wall of the container.

[0005] The purpose of the present invention can be achieved by the following technical solutions: A process for resource treatment of liquid manure includes the following steps:

[0006] S1: Pretreatment of solid waste separation. The fecal sewage generated from livestock and poultry breeding is discharged into a sump, a flocculant is added and stirred, and after precipitation and stratification, the upper-layer liquid manure is pumped into a solid-liquid separation device for solid-liquid separation;

[0007] S2: Pretreatment of suspended substances. The waste liquid separated in S2 is discharged into a fermentation tank, and a jet agitation assembly installed at the top of the fermentation tank is used to reciprocally spray dissolved air water up and down along the inner wall of the fermentation tank;

[0008] In this step, a stirring plate that flips up and down is used to stir the waste liquid. At the same time, the dissolved air water ejected by multiple jet pipes flushes the inner wall of the fermentation tank, creating an air flotation environment in the fermentation tank. The fine impurities in the waste liquid are driven upward to form an air flotation layer on the liquid surface.

[0009] S3: Scum discharge treatment. The impurities gather in the air flotation layer to form scum, and the scraper structures on both sides of the jet stirring component are used to discharge the scum towards the slag discharge port opened on the upper side wall of the fermentation tank.

[0010] S4: Fermentation treatment. The sludge solid-liquid mixture is reciprocally sprayed up and down against the inner wall of the fermentation tank by the jet stirring component, so that it is mixed with the waste liquid to ferment and produce biogas, and the biogas is discharged through the biogas discharge pipe.

[0011] S5: Biogas slurry separation treatment. The biogas slurry and biogas residue are separated by using a slag discharge cylinder.

[0012] Furthermore, heating plates are fixedly installed on both sides inside the fermentation tank, and a pair of heating plates form an annular structure for the inner end wall of the fermentation tank.

[0013] Furthermore, the jet stirring component includes a fixed box fixedly installed in the middle of the top of the fermentation tank. Synchronously operated rotating cylinders are rotatably driven and installed on both sides of the lower end of the fixed box. A stirring plate adapted to the annular inner wall of the fermentation tank is fixed to the outer end of the rotating cylinder. A plurality of jet pipes are arranged horizontally at the bottom end of the stirring plate and distributed front and back. An inlet and circulation structure is installed at the fixed box, and the inner ends of the plurality of jet pipes are fixedly connected with connecting hoses that extend into the fixed box and are connected to the inlet and circulation structure.

[0014] Furthermore, the inlet and circulation structure includes a pair of connecting rigid pipes fixedly installed in the fixed box. The outer ends of the pair of connecting rigid pipes penetrate through the fixed box and are jointly connected to a liquid inlet pipe. An air inlet pipe and a feeding pipe are externally connected to the liquid inlet pipe.

[0015] Furthermore, the jet pipe is rotatably installed on the lower end wall of the stirring plate, and the end of the jet pipe away from the connecting hose extends to the outer end wall of the stirring plate and is provided with a downwardly inclined spray nozzle.

[0016] Furthermore, gears are fixedly sleeved and installed at the ends of the plurality of jet pipes extending to the inside of the rotating cylinder. A rack that meshes and engages with the plurality of gears is horizontally movably installed at the upper end part inside the rotating cylinder, and driving components for driving the rack back and forth are installed at the front and rear ends of the rotating cylinder.

[0017] Furthermore, the driving component includes an electromagnetic sheet fixedly installed at the end of the rotating cylinder. A guide rod is connected to the electromagnetic sheet and movably penetrates into the rack, and a return spring fixed between the electromagnetic sheet and the end of the rack is sleeved on the guide rod. The end of the rack is made of a magnetic material adapted to the electromagnetic sheet.

[0018] Furthermore, the slag discharge cylinder rotation drive is installed at the bottom end of the fermentation tank, and a spiral conveyor blade extending to the end outlet thereof is rotatably installed inside the slag discharge cylinder;

[0019] A blanking port corresponding to the bottom discharge port of the fermentation tank is provided on the end wall of the slag discharge cylinder located at the bottom end of the fermentation tank, and filter holes are provided at the end of the slag discharge cylinder extending to the outside of the fermentation tank and arranged in a position opposite to the blanking port.

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] Based on the basic principle of liquid manure fermentation treatment in the prior art, a jet agitation assembly is added in the fermentation tank. The agitation plates running synchronously on both sides fully agitate the waste liquid and cooperate with the jet actions of multiple jet pipes in multiple angles and large ranges. During the pretreatment process of suspended solids, water flow with a certain pressure is used as a carrier, and gas is synchronously introduced to form dissolved air water. With the change of different angles of the jet pipes, the dissolved air water flushes the inner wall of the fermentation tank, enhancing the fluidity of the waste liquid, forming an air flotation environment in the fermentation tank, driving the fine impurities in the waste liquid upward to form an air flotation layer on the liquid surface, so as to facilitate the removal of floating slag;

[0022] During the fermentation treatment process, while stirring the liquid manure in the fermentation tank, water flow with a certain pressure is also used as a carrier, and activated sludge is synchronously introduced. In a multi-angle jet flushing manner, the activated sludge put into the fermentation tank is efficiently dispersed, improving the mixing degree of the inoculum and the waste liquid, avoiding the occurrence of stratification phenomenon, improving the fermentation efficiency, and effectively avoiding the problem of the fermentation product adhering to the inner wall of the fermentation tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the process flow chart of the present invention;

[0024] Figure 2 is the overall equipment structure schematic diagram of the present invention;

[0025] Figure 3 is the structure schematic diagram of the fermentation tank of the present invention;

[0026] Figure 4 is the end cross-sectional view of the fermentation tank of the present invention;

[0027] Figure 5 is the structure schematic diagram of the jet agitation assembly of the present invention;

[0028] Figure 6 is the bottom view of the jet agitation assembly of the present invention;

[0029] Figure 7 is the partial cross-sectional view of the jet agitation assembly of the present invention;

[0030] Figure 8Partial cross-sectional view of another perspective of the jet agitation assembly of the present invention;

[0031] Figure 9 Schematic structural diagram of the joints of multiple jet pipes, gears, racks, and drive components of the present invention;

[0032] Figure 10 Schematic cross-sectional view when the jet agitation assembly of the present invention is working;

[0033] Figure 11 Schematic structural diagram of the present invention when using a scraper structure to remove scum;

[0034] Figure 12 End cross-sectional view of the fermentation tank during the biogas slurry separation process of the present invention;

[0035] Figure 13 Exploded view of the slag discharge cylinder of the present invention.

[0036] Explanation of the reference numerals in the figure:

[0037] 1, collection sump; 2, solid-liquid separation equipment; 3, fermentation tank; 301, biogas discharge pipe; 4, heating plate; 5, fixed box; 6, rotating drum; 7, stirring plate; 8, jet pipe; 801, connecting hose; 9, liquid inlet pipe; 901, gas inlet pipe; 902, feeding pipe; 10, connecting rigid pipe; 11, gear; 12, rack; 13, electromagnetic sheet; 14, return spring; 15, scraper; 16, electric push rod; 17, blocking plate; 18, slag discharge cylinder; 181, material dropping port; 182, filter hole; 183, biogas slurry discharge pipe; 19, spiral conveying blade. Detailed implementation manners

[0038] The following will combine the accompanying drawings in the embodiments of the present invention; clearly and completely describe the technical solutions in the embodiments of the present invention; obviously; the described embodiments are only a part of the embodiments of the present invention; rather than all embodiments. Based on the embodiments of the present invention; all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] Embodiment 1: In view of the fact that in the traditional manure fermentation process, the colloidal suspended matter formed by fine impurities affects the mixing of the inoculum and the liquid manure fermentation broth on the one hand, and on the other hand, impurity gases are generated during the anaerobic fermentation of the waste liquid, reducing the purity of the gas after fermentation. Secondly, it is also easy to cause the fermentation product to adhere to the inner wall of the container. The following technical solutions are proposed:

[0040] The present invention discloses a liquid manure resource treatment process. Please refer to Figure 1 and includes the following steps:

[0041] S1: Solid waste separation pretreatment. Please refer toFigure 2 , the feces and sewage produced by livestock and poultry breeding are discharged into the manure collecting tank 1, flocculants are added for stirring, and after sedimentation and stratification, the upper layer of liquid feces and sewage is pumped into the solid-liquid separation equipment 2 for solid-liquid separation;

[0042] S2: Suspended matter pretreatment, see Figure 2-4 and Figure 10 , the waste liquid separated by S2 is discharged into the fermentation tank 3, and the jet stirring assembly installed on the top of the fermentation tank 3 is used to reciprocate the dissolved air water up and down along the inner wall of the fermentation tank 3, so as to dissolve the air or inert gas in the water under a certain pressure to obtain the dissolved air water. When the dissolved air water and the waste liquid are fully mixed, the pressure is reduced, and the dissolved gas is released in the form of tiny bubbles, which are attached to the suspended matter and drive it upward;

[0043] In this process, the waste liquid is stirred up and down by the upside-down stirring plate 7. At the same time, the dissolved air water sprayed by the multiple jet tubes 8 flushes the inner wall of the fermentation tank 3, which enhances the fluidity of the waste liquid on the one hand, and forms an air flotation environment in the fermentation tank 3 on the other hand, driving the fine impurities in the waste liquid upward to form an air flotation layer on the liquid surface, and the gas in the fermentation tank 3 is discharged from the exhaust valve at the top;

[0044] S3: Scum discharge treatment, a number of bubbles drive impurities to gather in the air floating layer to form scum, please refer to Figure 11 , using the scraper structures on both sides of the jet stirring assembly to circulate multiple times to discharge the scum toward the slag discharge port opened on the upper side wall of the fermentation tank 3;

[0045] S4: Fermentation treatment, see Figure 10 , the jet stirring assembly is also used to reciprocately spray the sludge solid-liquid mixture up and down toward the inner wall of the fermentation tank 3, so that it is fully mixed with the waste liquid to form a liquid. In this process, the heating plate 4 is used to provide a suitable fermentation environment, and the liquid continues to ferment to produce biogas, which is discharged from the biogas discharge pipe 301;

[0046] S5: Biogas slurry separation and treatment. After fermentation is completed, please refer to Figure 12 , Figure 13 , using the slag discharge cylinder (18) to separate the biogas slurry and biogas slag, specifically:

[0047] The slag discharge barrel 18 is turned on by rotating upward, and the biogas slurry mixture inside the fermentation tank 3 is introduced into the slag discharge barrel 18 through the discharge port at the bottom of the fermentation tank 3, and the discharge port 181 in the slag discharge barrel 18 is started to transport the biogas slurry mixture to the outside of the slag discharge barrel 18. In this process, the biogas slurry is filtered out as liquid organic fertilizer through a plurality of biogas slurry discharge pipes 183, and the biogas residue is discharged through the end of the slag discharge barrel 18.

[0048] Embodiment 2: This embodiment provides the following description for the specific processing device involved in Embodiment 1:

[0049] Please refer to Figure 4 , heating plates 4 are fixedly installed on both sides inside the fermentation tank 3. The bottom ends of a pair of heating plates 4 extend to the discharge ports at the inner bottom of the fermentation tank 3. The pair of heating plates 4 form an annular structure with the inner end walls of the fermentation tank 3. During the fermentation process, the pair of heating plates 4 are started, and the pair of heating plates 4 provide a fermentation environment with a suitable temperature inside the fermentation tank 3.

[0050] Please refer to Figure 3-Figure 8 , the jet agitation assembly includes a fixed box 5 fixedly installed in the middle of the top of the fermentation tank 3. On both sides of the lower end of the fixed box 5, rotating drums 6 that operate synchronously are rotationally driven. An agitation plate 7 that is adapted to the annular inner wall of the fermentation tank 3 and is in a hollow state is fixed to the outer end of the rotating drum 6. A plurality of jet pipes 8 distributed front and back in the horizontal direction are provided on the bottom end wall of the agitation plate 7. An inlet material circulation structure is installed at the fixed box 5. The inner ends of a plurality of jet pipes 8 are fixedly connected with communication hoses 801 that extend into the fixed box 5 and are connected to the inlet material circulation structure. A cavity for the communication hose 801 to communicate with the inlet material circulation structure is opened on one side of the rotating drum 6 adjacent to the fixed box 5. The opening of the cavity is used to accommodate the loading of the communication hose 801, and the cavity is not exposed during the rotation of the rotating drum 6;

[0051] The inlet material circulation structure includes a pair of communication hard pipes 10 fixedly installed in the fixed box 5. The outer ends of the pair of communication hard pipes 10 penetrate the fixed box 5 and are jointly connected to a liquid inlet pipe 9. An air inlet pipe 901 and a feed pipe 902 are externally connected to the liquid inlet pipe 9;

[0052] In the suspended solid pretreatment link in S2, water flow is provided to the jet agitation assembly through the liquid inlet pipe 9. At the same time, gas is synchronously supplied through the air inlet pipe 901. The gas can be selected as air or inert gas. The air or inert gas is dissolved in water under a certain pressure to obtain dissolved air water. The dissolved air water is shunted into a plurality of jet pipes 8 through the communication hard pipes 10 and finally sprayed into the waste liquid in the fermentation tank 3;

[0053] In this process, a pair of rotating drums 6 are driven to synchronously turn up and down by an externally connected rotation drive mechanism, so as to realize that while the agitation plate 7 turns up and down to agitate the waste liquid, the dissolved air water under a certain pressure is sprayed into the waste liquid. The purpose is not only to promote the stirring effect, but also to utilize the principle that the pressure decreases when the dissolved air water is fully mixed with the waste liquid, so that the dissolved gas is released in the form of a large number of tiny bubbles, forming an air flotation environment in the fermentation tank 3. These bubbles adhere to the suspended solids in the waste liquid and drive them upward to form an air flotation layer on the liquid surface.

[0054] For further explanation of the jet agitation assembly:

[0055] Please refer to Figure 7-Figure 10, a plurality of stirring rods are arranged on the stirring plate 7 in the front and rear distribution. The jet pipe 8 is rotatably installed on the lower end wall of the stirring plate 7, and one end of the jet pipe 8 far from the connecting hose 801 extends to the outer end wall of the stirring plate 7 and is provided with a downwardly inclined spray nozzle. One ends of a plurality of jet pipes 8 extending to the inner side of the rotating cylinder 6 are fixedly sleeved and installed with gears 11. A rack 12 engaged with a plurality of gears 11 is horizontally movably installed at the upper end part inside the rotating cylinder 6, and driving components for driving the rack 12 back and forth are installed at the front and rear ends of the rotating cylinder 6;

[0056] The driving component includes an electromagnetic sheet 13 fixedly installed at the end of the rotating cylinder 6. A guide rod is connected to the electromagnetic sheet 13 and movably penetrates into the rack 12. A return spring 14 fixed between the electromagnetic sheet 13 and the end of the rack 12 is sleeved on the guide rod. The end of the rack 12 is made of a magnetic material adapted to the electromagnetic sheet 13;

[0057] During the up-and-down flipping of a pair of stirring plates 7, the dissolved air water is sprayed out from the spray nozzle at the outermost end of the jet pipe 8. The spray nozzle is arranged adjacent to the outermost end of the stirring plate 7. That is, when the spray nozzle moves up and down with the stirring plate 7, it sprays the dissolved air water towards the annular inner wall of the fermentation tank 3. Taking the water flow with a certain pressure as a carrier and synchronously introducing gas, the formed dissolved air water flushes the inner wall of the fermentation tank 3 with the change of different angles of the jet pipe 8. Specifically, the dissolved air water impacts the inner wall of the fermentation tank 3, rebounds after the impact, and then impacts the waste liquid from bottom to top and from outside to inside. A large number of bubbles formed diffuse in the waste liquid from bottom to top and from outside to inside, driving the fine impurities in the waste liquid upward;

[0058] The stirring plate 7 scrapes the annular inner wall of the fermentation tank 3, and the sprayed dissolved air water flushes the inner wall of the fermentation tank 3, enhancing the fluidity of the waste liquid to prevent the fermentation substances from adhering to the inner wall of the fermentation tank 3 due to poor fluidity;

[0059] In this process, the electromagnetic sheets 13 on the front and rear sides of the rotating cylinder 6 are intermittently opened and closed. Relying on the intermittent opening and closing of a pair of front and rear electromagnetic sheets 13 and the cooperation with the return spring 14 and the guide rod, the rack 12 moves back and forth. When the rack 12 moves in the front and rear directions, a plurality of gears 11 synchronously drive the jet pipe 8 to rotate left and right reciprocally along its circumferential direction, so that a plurality of jet pipes 8 move left and right reciprocally along their axial directions, that is, along the front and rear horizontal directions of the stirring plate 7, continuously changing the spraying direction of the spray nozzles of the jet pipes 8. The purpose is to expand the spraying range of the jet pipes 8 to improve the air distribution and water distribution uniformity and provide a stable air flotation environment under the condition that a plurality of jet pipes 8 are distributed at intervals in the front and rear.

[0060] The fine impurities continuously gather upward in the air flotation layer to form scum. At this time, the scum can be scraped by the scraping plate structures located on the left and right sides of the jet stirring assembly, and the scum is discharged from the slag discharge ports opened on both sides of the top of the fermentation tank 3.

[0061] Among them, please refer toFigure 10-Figure 11 The scraper structure includes a pair of electric push rods 16 fixedly installed at the top end of the fermentation tank 3. The telescopic ends of the pair of electric push rods 16 penetrate into the interior of the fermentation tank 3 and are fixed with a scraper 15 attached to one side of the fixed box 5. The outer end of the scraper 15 is fixed with a sealing plate 17 initially located at the slag discharge port of the fermentation tank 3 through a connecting rod. The bottom wall of the slag discharge port is provided with an inclined slag guiding table that is opened from the inside to the outside and from top to bottom. In the initial state, the sealing plate 17 seals the slag discharge port, making the interior of the fermentation tank 3 in a closed state. When discharging slag, the electric push rod 16 is started, and the electric push rod 16 drives the scraper 15 outwards. The scraper 15 scrapes the floating slag suspended on the liquid surface outwards, and note that the liquid level height should be higher than the height of the slag discharge port.

[0062] After the slag discharge work is completed, fermentation treatment is carried out. The jet agitation assembly continues to operate. While stirring the liquid manure in the fermentation tank, at the same time, taking a certain-pressure water flow as a carrier, activated sludge is synchronously introduced. In a multi-angle jet flushing manner, the activated sludge put into the fermentation tank 3 is efficiently dispersed, improving the mixing degree of the inoculum and the waste liquid, avoiding the occurrence of stratification phenomena, improving the fermentation efficiency, and at the same time effectively avoiding the problem that the fermented matter adheres to the inner wall of the fermentation tank 3.

[0063] The sludge contains a rich microbial community, including aerobic bacteria, anaerobic bacteria, facultative anaerobic bacteria, and various protozoa and metazoans, etc., providing a large number of microbial seeds for fermentation. These microorganisms can quickly adapt to the manure environment, start the fermentation process, and accelerate the decomposition and transformation of organic matter.

[0064] Example 3: On the basis of Examples 1 and 2, this example details the structure and process involved in the biogas slurry separation treatment link in S4, as follows:

[0065] Please refer to Figure 4 and Figure 12 、 Figure 13 , the slag discharge cylinder 18 is rotationally driven and installed at the bottom end of the fermentation tank 3. A spiral conveyor blade 19 extending to the end outlet is rotatably installed inside the slag discharge cylinder 18. The end wall of the slag discharge cylinder 18 located at the bottom end of the fermentation tank 3 is provided with a feeding port 181 corresponding to the position of the bottom discharge port of the fermentation tank 3. The end of the slag discharge cylinder 18 extending outside the fermentation tank 3 is provided with a filter hole 182 arranged in the opposite position to the feeding port 181. A liquid guiding channel with a biogas slurry discharge pipe 183 is provided outside the filter hole 182.

[0066] During the fermentation treatment and pre-treatment process, the discharge port 181 on the slag discharge barrel 18 faces downward to block the discharge port at the bottom of the fermentation tank 3. After the fermentation is completed, the slag discharge barrel 18 is rotated upward by the external driving mechanism and the meshing gear set structure until the discharge port 181 is connected with the discharge port of the fermentation tank 3. At this time, the openings of the plurality of filter holes 182 on the outside of the slag discharge barrel 18 face downward, and the biogas slurry mixture in the fermentation tank 3 is discharged into the slag discharge barrel 18, and the spiral conveying piece 19 is started to discharge the biogas slurry mixture outward by the rotating spiral conveying piece 19. During the spiral discharge process, the biogas slurry is filtered into the liquid guide channel through the plurality of filter holes 182, and is finally discharged from the biogas slurry discharge pipe 183 as liquid organic fertilizer, and the biogas slag discharged from the outermost end of the slag discharge barrel 18 can be used for subsequent composting treatment.

[0067] In summary, based on the basic principle of liquid manure fermentation treatment in the prior art, a jet stirring assembly is added to the fermentation tank 3, and the waste liquid is fully stirred by the stirring plates 7 running synchronously on both sides and cooperated with the multi-angle and large-range jet action of multiple jet tubes 8. In the process of suspended matter pretreatment, a certain pressure water flow is used as a carrier, and gas is introduced synchronously. The formed dissolved gas water flushes the inner wall of the fermentation tank 3 with the change of different angles of the jet tube 8, thereby enhancing the fluidity of the waste liquid, forming an air flotation environment in the fermentation tank 3, and driving the fine impurities in the waste liquid upward to the liquid surface to form an air flotation layer, so as to facilitate the removal of scum;

[0068] During the fermentation process, a certain pressure water flow is also used as a carrier, and activated sludge is introduced simultaneously, and a multi-angle spray flushing method is used to improve the mixing degree of the inoculum and the waste liquid, while preventing the fermentation product from adhering to the inner wall of the fermentation tank 3.

[0069] The above are only preferred specific implementation modes of the present invention; however, the protection scope of the present invention is not limited thereto; any technician familiar with the technical field within the technical scope disclosed by the present invention; any equivalent replacement or change based on the technical solution and improved concept of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A process for recycling liquid feces and sewage, characterized in that: The following steps are involved: S1: Solid waste separation pretreatment, excrement and sewage generated from livestock and poultry farming are discharged into a manure collection tank (1), flocculants are added for stirring, and after sedimentation and stratification, the upper layer of liquid excrement is pumped into a solid-liquid separation device (2) for solid-liquid separation; S2: suspended matter pretreatment, the waste liquid separated from S2 is discharged into the fermentation tank (3), and the jet stirring assembly installed on the top of the fermentation tank (3) is used to reciprocate the dissolved air water up and down along the inner wall of the fermentation tank (3); In this step, the waste liquid is stirred by a stirring plate (7) that turns upside down. At the same time, dissolved air water sprayed by a plurality of jet tubes (8) flushes the inner wall of the fermentation tank (3), thereby forming an air flotation environment in the fermentation tank (3) and driving fine impurities in the waste liquid upward to the liquid surface to form an air flotation layer. S3: scum discharge treatment, impurities gather in the air flotation layer to form scum, and the scraper structures on both sides of the jet stirring assembly are used to discharge the scum toward the slag discharge port opened on the upper side wall of the fermentation tank (3); S4: fermentation treatment, using a jet stirring assembly to reciprocately spray the sludge solid-liquid mixture up and down toward the inner wall of the fermentation tank (3), so that the sludge solid-liquid mixture is mixed with the waste liquid and fermented to produce biogas, which is discharged from the biogas discharge pipe (301); S5: Biogas slurry separation treatment, using a slag discharge cylinder (18) to separate biogas slurry and biogas slag.

2. A liquid manure resource treatment process according to claim 1, characterized in that: Heating plates (4) are fixedly installed on both sides of the fermentation tank (3), and a pair of heating plates (4) form an annular structure with the inner end wall of the fermentation tank (3).

3. A liquid manure resource treatment process according to claim 1, characterized in that: The jet stirring assembly comprises a fixed box (5) fixedly mounted at the middle of the top end of the fermentation tank (3), and both sides of the lower end of the fixed box (5) are rotationally driven to be installed with a synchronously running rotating drum (6), and the outer end of the rotating drum (6) is fixed with a stirring plate (7) adapted to the annular inner wall of the fermentation tank (3), and the bottom end wall of the stirring plate (7) is provided with a plurality of jet tubes (8) distributed front and back in the horizontal direction; The fixed box (5) is provided with a material feeding circulation structure, and the inner ends of the plurality of jet tubes (8) are fixedly connected with a connecting hose (801) extending into the interior of the fixed box (5) and communicating with the material feeding circulation structure.

4. A liquid manure resource treatment process according to claim 3, characterized in that: The feed circulation structure comprises a pair of communicating hard pipes (10) fixedly installed in a fixed box (5); the outer ends of the pair of communicating hard pipes (10) penetrate the fixed box (5) and are commonly connected to a liquid inlet pipe (9); and the liquid inlet pipe (9) is externally connected to an air inlet pipe (901) and a feed pipe (902).

5. The process for recycling liquid feces and sewage according to claim 3 is characterized in that: The jet pipe (8) is rotatably mounted on the lower end wall of the stirring plate (7), and one end of the jet pipe (8) away from the connecting hose (801) extends to the outer end wall of the stirring plate (7) and is provided with a jet nozzle arranged in a downward tilt.

6. A liquid manure resource treatment process according to claim 5, characterized in that: A gear (11) is fixedly sleeved and installed at one end of each of the plurality of jet tubes (8) extending to the inner side of the rotating drum (6); a rack (12) meshing with the plurality of gears (11) is installed horizontally and movably at the upper end of the inner side of the rotating drum (6); and a driving assembly for driving the rack (12) forward and backward is installed at the front and rear ends of the rotating drum (6).

7. A liquid manure resource treatment process according to claim 6, characterized in that: The driving assembly comprises an electromagnetic sheet (13) fixedly mounted on the end of a rotating drum (6); a guide rod movably penetrating into a rack (12) is connected to the electromagnetic sheet (13); a return spring (14) fixed between the electromagnetic sheet (13) and the end of the rack (12) is sleeved on the guide rod; the end of the rack (12) is made of a magnetic material compatible with the electromagnetic sheet (13).

8. The process for recycling liquid feces and sewage according to claim 1 is characterized in that: The slag discharge cylinder (18) is rotatably mounted at the bottom end of the fermentation tank (3), and a spiral conveying piece (19) extending to the outlet at the end thereof is rotatably mounted inside the slag discharge cylinder (18); The end wall of the slag discharge cylinder (18) located at the bottom end of the fermentation tank (3) is provided with a discharge port (181) corresponding to the position of the discharge port at the bottom end of the fermentation tank (3), and the end of the slag discharge cylinder (18) extending to the outside of the fermentation tank (3) is provided with a filter hole (182) arranged opposite to the discharge port (181).

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