Dual-function method and equipment for reducing salt of kitchen waste and producing bio-organic fertilizer

Abstract

The invention relates to the technical field of bio-organic fertilizers, in particular to a dual-function method and equipment for reducing salt of kitchen waste and producing a bio-organic fertilizer. The content of grease and salt in the waste liquid is reduced through the salt-tolerant microbiome and the potassium-solubilizing, phosphorus-solubilizing and nitrogen-fixing bacteria flora, and the organic fertilizer capable of being biologically utilized is prepared. By treating the kitchen waste liquid, the kitchen waste liquid can be effectively converted into the bio-organic fertilizer and salt recovery is realized, so that the kitchen waste treatment efficiency is improved, the environmental pollution is reduced, the cyclic utilization rate of resources is improved, and the method has important significance in promoting sustainable development.

Description

Technical Field

[0001] The invention relates to the technical field of bio-organic fertilizers, in particular to a dual-function method and device for reducing salt in kitchen waste and producing bio-organic fertilizers. Background Art

[0002] With the acceleration of urbanization and population growth, the amount of kitchen waste generated has increased annually, causing serious environmental problems. Not only does this waste constitute a significant portion of municipal solid waste, but it also generates foul odors and breeds bacteria during storage, impacting the surrounding environment and the health of residents. Therefore, effectively disposing of this waste and minimizing its environmental impact has become a pressing issue.

[0003] Traditional methods for food waste disposal primarily include landfilling, incineration, and composting. While these methods can reduce waste volume to a certain extent, they carry drawbacks such as environmental pollution, resource waste, and high energy consumption. Furthermore, household food waste often contains a large amount of water, and direct discharge of this liquid waste without treatment can cause secondary water pollution.

[0004] In recent years, microbial treatment technology has been gradually introduced into the field of food waste treatment. Leveraging the characteristics of microorganisms, they can not only effectively degrade organic matter in food waste, converting it into harmless substances, but also reduce the environmental impact of the treatment process. However, the wastewater produced by microbial treatment still contains some components such as salts and nitrogen and phosphorus compounds. If these components are not properly treated, they may still have an impact on the environment. Summary of the Invention

[0005] In response to the shortcomings of the above-mentioned prior art, the present invention proposes a dual-function method and apparatus for reducing salt content in food waste and producing bio-organic fertilizer. By treating liquid food waste, the method can effectively convert liquid food waste into bio-organic fertilizer and recover salt, thereby improving the efficiency of food waste treatment, reducing environmental pollution, and increasing the recycling rate of resources, which is of great significance to promoting sustainable development. The specific scheme is as follows: A dual-function method for reducing salt in kitchen waste and producing bio-organic fertilizer comprises the following steps: S1: Separate the waste liquid in the kitchen waste using a solid-liquid separation device, and collect the resulting waste liquid and solid matter separately; S2: using a magnetic pump to pump the waste liquid into a first fermentation tank with a double-layer structure, so that the waste liquid is located in the inner structure of the first fermentation tank, and adding water to the outer structure of the first fermentation tank. Using a circulating heating system to heat the water in the outer structure to sterilize the waste liquid, the waste liquid is naturally cooled after sterilization; S3: Inoculate the salt-tolerant bacteria at a ratio of 2% (v / v) into the first fermentation tank, react for 5-7 days at 30-40°C, and stir with a stirring device. When the pH value of the waste liquid reaches 7.5, let the waste liquid stand for 1-2 days to obtain salt-tolerant bacterial fertilizer; S4: removing the salt-tolerant bacteria in the first fermentation tank, heating the water in the outer layer of the first fermentation tank to sterilize the waste liquid; pumping the waste liquid into the second fermentation tank with a double-layer structure through a magnetic pump, so that the waste liquid is located in the inner layer of the second fermentation tank; then inoculating the growth-promoting bacteria into the second fermentation tank at a ratio of 2% (v / v) of the waste liquid, reacting for 5-7 days at 30-40°C, while stirring with a stirring device, maintaining the pH value of the waste liquid at 7.5, and allowing the waste liquid to stand for 1-2 days to obtain a biological fertilizer; S5: Use a magnetic pump to pump the waste liquid in the second fermentation tank into the decolorization tank, add 10% (w / v) activated carbon powder, 3-5% (w / v) alum and flocculant to the waste liquid, and use a stirring device to stir and decolorize for 12 hours to obtain a supernatant; S6: Use a stainless steel pump to pump the supernatant into a PP membrane device, and use the PP membrane device to remove suspended particles and some colloids in the supernatant; then use a diaphragm pump to pump the supernatant that has passed through the PP membrane device into an ultrafiltration device, a nanofiltration device, and a reverse osmosis device in sequence for further treatment to obtain concentrated salt liquid.

[0006] As a preferred embodiment of the present invention, the salt-tolerant bacteria group is composed of a mixture of five strains, namely: Nocardiopsis dasonvillei subspecies dasonvillei, Exiguobacterium tsingtaodi, Bacillus millefolium, Priesteria filopodiales and Marinobacterium.

[0007] As a preferred embodiment of the present invention, the growth-promoting bacteria group is composed of a mixture of potassium-solubilizing bacteria, phosphate-solubilizing bacteria and nitrogen-fixing bacteria; wherein the potassium-solubilizing bacteria include: Bacillus velessiensis, Bacillus siamese and Bacillus cabrillais; Phosphate-solubilizing bacteria include: Micromonospora cyanogenensis and Oleobacterium oleiferum; Nitrogen-fixing bacteria include: Micromonospora thailandica, Pseudomonas northern guni and Micromonospora citri.

[0008] As a preferred embodiment of the present invention, the bacteria in the salt-tolerant bacteria group and the growth-promoting bacteria group are activated using LB culture medium; The bacterial species in the salt-tolerant bacterial group and the growth-promoting bacterial group need to be amplified and cultured in a culture medium before being cultured.

[0009] As a preferred embodiment of the present invention, during the fermentation process of the salt-tolerant bacteria group and the growth-promoting bacteria group in the first fermenter and the second fermenter, the reaction temperature is 35°C.

[0010] Air pumps are installed on the top of the first fermentation tank and the second fermentation tank to aerate the waste liquid in the first fermentation tank and the second fermentation tank. The rejection rate of the reverse osmosis device is ≥90%, and the operating pressure is 1.5-2.5 MPa.

[0011] As a preferred embodiment of the present invention, in step S2, the water in the outer structure is heated to a temperature of 90°C. After maintaining this temperature for 1 hour, the circulating heating system is turned off to allow the waste liquid in the first fermentation tank to cool naturally to 35°C. In step S3, the stirring device operates at a speed of 200 rpm / min; In step S4, the water in the outer structure of the first fermentation tank is heated to a temperature of 90°C. After maintaining this temperature for 1 hour, the circulating heating system is turned off to allow the waste liquid in the first fermentation tank to cool naturally to 35°C. In step S4, the stirring device operates at a speed of 200 rpm / min.

[0012] A dual-function device for reducing salt content in kitchen waste and producing bio-organic fertilizer, which is applicable to the dual-function method for reducing salt content in kitchen waste and producing bio-organic fertilizer; The invention comprises a first fermentation tank; the first fermentation tank comprises an inner cylinder; a cylinder cover is installed on the top of the inner cylinder; an outer partition is fixedly installed on the outer side of the inner cylinder; An outflow device is installed at the bottom of the inner cylinder; a barrier layer is provided on the top of the outflow device, and the barrier layer is fixedly installed in the inner cylinder; the top of the barrier layer is a curved surface; The outflow device includes an arc-shaped bin, and the bottom of the arc-shaped bin is a plane; a liquid outlet pipe is installed at the bottom of the arc-shaped bin, and a first valve is installed in the liquid outlet pipe; An annular arc plate is fixedly connected to the arc-shaped bin, and a gap is left between the annular arc plate and the arc-shaped bin; a leakage groove is opened on the surface of the annular arc plate, and a filter is installed in the leakage groove; A conduit is rotatably mounted in the middle of the barrier layer; a drive shaft is fixedly connected to the top of the conduit, and the drive shaft extends to the top of the cylinder cover and is connected to the motor; The outer ring of the conduit is fixedly connected to the arc-shaped plate, and a flow channel is opened in the arc-shaped plate; the outer ring surface of the conduit is opened with evenly arranged grooves, and the grooves are connected to the flow channel; A fixed pipe is provided below the conduit, and the fixed pipe is fixedly connected to the arc-shaped bin via an L-shaped plate; the conduit rotates in the fixed pipe; a first solenoid valve is installed in the fixed pipe; A plurality of suction pumps are installed at the bottom of the outer barrier; a bottom pipe extends from the bottom of the suction pump; two suction pipes are installed on the bottom pipe, the upper suction pipe passes through the annular arc plate and extends above the filter screen, and the bottom suction pipe extends between the annular arc plates and is aligned with the filter screen; a second solenoid valve is installed in each of the two suction pipes; A top pipe is installed on the top of the suction pump, and the top pipe passes through the outer barrier and extends above the outer barrier; an outlet pipe is installed on the top pipe, and the outlet pipe extends out of the inner tube; a second valve is installed on the top of each top pipe.

[0013] As a preferred embodiment of the present invention, a blade is fixedly connected to the top of the arc-shaped plate, and the blade is in contact with the inner surface of the inner cylinder.

[0014] As a preferred embodiment of the present invention, a screwdriver piece is fixedly connected to the middle of the drive shaft; A guide cylinder is provided on the outside of the auger piece, and the guide cylinder is fixedly connected to the inner cylinder through a connecting rod.

[0015] As a preferred embodiment of the present invention, one side of the conduit extending into the annular arc plate is fixedly connected to a driving plate; A cleaning brush layer is fixedly connected to the driving plate, and the cleaning brush layer is in contact with the surface of the annular arc plate.

[0016] The beneficial effects of the present invention are as follows: 1. The present invention discloses a dual-function method and apparatus for reducing salt levels in food waste and producing bio-organic fertilizer. Using 16S sequencing technology, we screened five salt-tolerant, three nitrogen-fixing, three potassium-solubilizing, and two phosphate-solubilizing strains. Leveraging the core adaptive function of salt-tolerant bacteria, the unique compensatory function of nitrogen-fixing bacteria, and the targeted decomposition of organic acids and salt precipitation by potassium- and phosphate-solubilizing bacteria, this method effectively degrades stubborn organic matter and residual pollutants in wastewater. This method also reduces suspended solids, color, and odor in the wastewater, improving its transparency and stability. By inhibiting the growth of pathogens and harmful microorganisms, the wastewater's microbial safety is improved. Practice has demonstrated that this biological method for treating food wastewater from food waste is easy to operate and highly practical.

[0017] 2. The present invention discloses a dual-function method and apparatus for reducing salt levels in food waste and producing bio-organic fertilizer. The process employed in the present invention effectively converts food waste leachate into bio-organic fertilizer and recovers salt. This innovative technology provides a new approach for the high-value utilization of domestic waste, helping to reduce environmental pollution, improve resource utilization, and promote sustainable economic development. Furthermore, the bacterial strains used in the present invention can be cultured at room temperature for added value, thereby reducing energy consumption in industrial applications and possessing practical application value.

[0018] 3. The dual-function method and apparatus for reducing salt levels in kitchen waste and producing bio-organic fertilizer described in the present invention, by extracting waste liquid from the bottom of the barrier layer, passing the waste liquid through hot water, and finally re-introducing it into the inner barrel, can circulate the waste liquid in the inner barrel and heat it with the hot water in the outer barrier layer, thereby improving the heating effect of the hot water on the waste liquid, accelerating the waste liquid to reach the desired reaction temperature, and thus accelerating the reaction rate of the waste liquid.

[0019] 4. The dual-function method and apparatus for reducing salt levels in kitchen waste and producing bio-organic fertilizer described in the present invention filter bacteria in waste liquid passing through the annular arc plate, preventing some bacteria from floating in the waste liquid and being unable to be removed, thereby affecting subsequent work on the waste liquid. During the waste liquid filtration process, the drive shaft controls the conduit and the arc plate to rotate slowly. The rotating arc plate rotates along the top surface of the barrier layer, thereby scraping off the bacteria remaining on the upper surface of the barrier layer. This part of the bacteria then passes through the flow channel first and then flows through the conduit into the annular arc plate. In this process, the bacteria removal effect can be further improved, and the content of bacteria in the waste liquid can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a process flow chart of the overall process of reducing salt in kitchen waste liquid and producing bio-organic fertilizer according to the present invention; Figure 2 This is an overall diagram of the first fermentation tank after installation in the present invention; Figure 3 is a perspective view of the first fermentation tank of the present invention; Figure 4 This is a diagram of the internal structure of the first fermentation tank of the present invention; Figure 5 is a top view of the first fermentation tank of the present invention; Figure 6 This invention Figure 5 Cross-sectional view at AA in the middle; Figure 7 This invention Figure 6 A partial enlarged view of point B in the middle.

[0022] In the figure: 1. Inner tube; 11. Barrier layer; 12. Conduit; 13. Arc plate; 14. Flow channel; 15. Notch; 16. Fixed tube; 17. Blade; 18. Auger blade; 19. Guide tube; 2. Outer barrier; 21. Suction pump; 22. Bottom tube; 23. Suction tube; 24. Top tube; 25. Outlet tube; 3. Arc bin; 31. Liquid outlet pipe; 32. Annular arc plate; 33. Leakage trough; 34. Filter; 35. Cleaning brush layer. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the 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 drawings in the embodiments of the present invention. Obviously, the embodiments described 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.

[0024] As mentioned in the background, traditional methods for treating food waste primarily include landfilling, incineration, and composting. While these methods can reduce waste volume to a certain extent, they also present drawbacks such as environmental pollution, resource waste, and high energy consumption. Furthermore, household food waste often contains a large amount of water, and direct discharge of this liquid waste without treatment can cause secondary pollution to water bodies. Therefore, how to improve the efficiency of food waste treatment, reduce environmental pollution, and increase the recycling rate of resources is one of the technical difficulties in the existing technology.

[0025] In order to solve the above technical problems, the present invention proposes a dual-function method for reducing salt in kitchen waste and producing bio-organic fertilizer; like Figure 1 As shown; as an embodiment of the present invention; the dual-function method of reducing salt in kitchen waste and producing bio-organic fertilizer comprises the following steps: S1: Separate the waste liquid in the kitchen waste using a solid-liquid separation device, and collect the waste liquid and solid matter separately for use; S2: Using a magnetic pump, the waste liquid is pumped into a first fermentation tank with a double-layer structure made of stainless steel, so that the waste liquid is located in the inner structure of the first fermentation tank, and water is added to the outer structure of the first fermentation tank. The water in the outer structure is heated to an actual temperature of 90°C using a circulating heating system, and then maintained at this temperature for 1 hour to achieve the purpose of sterilizing the waste liquid. The circulating heating system is then turned off, and the waste liquid in the first fermentation tank is naturally cooled to 35°C in preparation for the subsequent introduction of salt-tolerant bacteria. S3: The salt-tolerant bacteria were inoculated into the first fermentation tank at a ratio of 2% (v / v), and stirred at 200 rpm / min at 30-40°C for 5-7 days. The total bacterial cell content was about 3×10 8CFU / mL, then sampling the waste liquid in the first fermentation tank, and measuring with pH paper that the pH of the waste liquid increased from the initial pH 7 to pH 7.5, and the color changed from the initial clear orange-red to a relatively turbid light yellow, and then the waste liquid in the first fermentation tank was allowed to stand for 1-2 days to allow the bacteria in the waste liquid to naturally settle, and the settled bacteria in the first fermentation tank were discharged through an outflow device and stored as a salt-tolerant bacterial fertilizer; S4: After the bacteria in the first fermentation tank are removed, the water in the outer structure of the first fermentation tank is heated to 90°C by the circulating heat-saving system and then maintained at this temperature for 1 hour to achieve the purpose of secondary sterilization; then the circulating heating system is turned off to allow the waste liquid in the first fermentation tank to cool naturally to 35°C, and then the waste liquid cooled to 35°C is pumped into the second fermentation tank with a double-layer structure of organic glass by a magnetic pump, so that the waste liquid is located in the inner structure of the second fermentation tank; then, the growth-promoting bacteria are inoculated into the second fermentation tank at a ratio of 2% (v / v) of the waste liquid, and the reaction is fully carried out for 5-7 days at an environment of 30-40°C and a stirring device at a speed of 200 rpm / min. The total bacterial content is about 1×10 9 CFU / mL, the waste liquid pH is 7.5, and then the waste liquid in the second fermentation tank is left to stand for 1-2 days to allow the bacteria in the waste liquid to settle naturally, and the settled bacteria in the second fermentation tank are discharged through the outflow device and stored for use as biological fertilizer; During the reaction process, fermentation is carried out in the first fermentation tank and the second fermentation tank respectively, and the solid precipitate obtained after each fermentation step is discharged through the outflow device at the bottom of the fermentation tank, which is the microbial compost obtained in the present invention; S5: Use a magnetic pump to pump the waste liquid in the second fermentation tank into the decolorization tank, add 10% (w / v) activated carbon powder, 3-5% (w / v) alum and flocculant to the waste liquid, and use a stirring device to fully stir and decolorize for 12 hours. The waste liquid in the decolorization tank is allowed to settle naturally to obtain a clear supernatant, and then the precipitate in the decolorization tank is removed through an outflow device; S6: The supernatant is pumped into the PP membrane device using a stainless steel pump, and the suspended particles and some colloids in the supernatant are removed by the PP membrane device; the supernatant after passing through the PP membrane device is then pumped into the ultrafiltration device, nanofiltration device and reverse osmosis device in sequence using a diaphragm pump for further treatment, and the supernatant is made to meet the discharge standards and the concentrated salt liquid is recovered; Among them, the ultrafiltration membrane is used to retain substances with a molecular weight of 1000-100000Da, remove large molecular organic matter, bacteria and some pigments, and provide protection for subsequent nanofiltration / reverse osmosis. Nanofiltration membrane selectively separates divalent and higher ions (such as SO 2- , Ca 2+ etc.); reverse osmosis membrane is used as the final desalination step, intercepting more than 90% of dissolved salts, producing concentrated brine and wastewater that meets standards.

[0026] Among them, the initial salinity of the food waste liquid was 1.38%. After one fermentation, the salinity dropped to 1.08%, a decrease of 21.7% compared with the original waste liquid salinity; after the second fermentation, the salinity dropped to 0.82%, a decrease of 24% compared with the waste liquid salinity after the first fermentation; after the reverse osmosis device, the salinity dropped to 0.11%, a total decrease of 92.0% compared with the initial salinity.

[0027] As an embodiment of the present invention, when the strains were obtained, they were screened using a selective culture medium and the microbial species were determined by 16S sequencing technology; the five salt-tolerant bacteria were: Nocardia dasonvillei subspecies dasonvillei, Exiguobacterium tsingtaoensis, Bacillus millefolium, Priesteria filamentosa, and Marinobacterium; The three nitrogen-fixing bacteria are Micromonospora thailandica, Pseudomonas northgunyi, and Micromonospora citri; the three potassium-solubilizing bacteria are Bacillus belizensis, Bacillus siamense, and Bacillus cabrillais; the two phosphate-solubilizing bacteria are Micromonospora cyanogensis and Bacillus oliveri.

[0028] Before use, each strain was mixed at a volume ratio of 1:1, and the mixed bacterial solution was inoculated at 10-20% (v / v).

[0029] The five salt-tolerant bacterial strains provided by the present invention can perform preliminary treatment on food waste liquid. Among them, the Marinobacterium exhibits strong salt tolerance and can survive and degrade organic matter in high-salt environments; the Nocardia dasonvillei subspecies dasonvillei has a strong ability to decompose complex organic matter such as fats and proteins; the Priesteria filiformis secretes multiple enzymes, such as proteases and amylases, to further decompose proteins and carbohydrates in food waste; the Bacillus pombe is highly efficient in degrading cellulose, including vegetable scraps in food waste; and the Exiguobacterium tsingtaoense exhibits low-temperature tolerance and strong adaptability, capable of degrading organic matter over a wide temperature range. The combined use of these five strains enables more comprehensive degradation of the various organic components (protein, fat, carbohydrates, cellulose, etc.) in food waste, thereby alleviating the inhibitory effects of high salt and lipid content on common bacterial flora and preventing the inactivation of other functional bacteria due to salt stress.

[0030] Another batch of eight potassium-solubilizing, phosphate-solubilizing, and nitrogen-fixing bacteria provided by the present invention can perform secondary treatment on wastewater after primary treatment. Among them, Micromonospora thailandica, Micromonospora citri, and Micromonospora cyanogenensis have strong abilities to decompose complex organic matter, particularly difficult-to-degrade polysaccharides, lignin, and humus. They can further degrade stubborn organic matter in the wastewater, reduce suspended matter and color, and improve wastewater clarity. Pseudomonas northern gunnii has high efficiency in degrading organic matter such as aromatic compounds and lipids. It can further reduce odor and potentially improve wastewater treatability by secreting biosurfactants. Bacillus velessiensis, Bacillus siamensis, and Bacillus cabrillais have broad-spectrum enzymatic activity and can further degrade residual proteins, fats, and carbohydrates in wastewater. They secrete antimicrobial substances that inhibit the growth of pathogens, improving the microbial safety of the wastewater. They also promote the mineralization of organic matter in the wastewater, generating more stable inorganic substances (such as CO2 and H2O). Oleobacterium oliveri strains are capable of degrading oils and lipids. They can further efficiently degrade residual oils and fats in wastewater, reducing oil stains and scum. Furthermore, since food waste is high in carbon and low in nitrogen, nitrogen-fixing bacteria (such as Pseudomonas spp.) directly fix atmospheric nitrogen, increasing the available nitrogen in the wastewater and avoiding the need for additional urea in traditional composting due to insufficient nitrogen. Symbiotic composting with salt-tolerant bacteria can enhance system stability.

[0031] As an embodiment of the present invention, the bacteria in the salt-tolerant bacteria group and the growth-promoting bacteria group are activated using LB culture medium; The bacteria in the salt-tolerant bacteria group and the growth-promoting bacteria group need to be expanded and cultured in the optimal culture medium before cultivation; In process production, practical application should be considered. In the process of obtaining bacterial strains, LB medium can be considered to replace the optimal medium. As an embodiment of the present invention, the salt-tolerant bacteria and the growth-promoting bacteria are fermented in the first fermenter and the second fermenter at a reaction temperature of 35° C. for 5-7 days. Air pumps are installed on the top of the first fermentation tank and the second fermentation tank to aerate the waste liquid in the first fermentation tank and the second fermentation tank to ensure that the bacterial flora in the first fermentation tank and the second fermentation tank achieve aerobic fermentation; As an embodiment of the present invention; the rejection rate of the reverse osmosis device is ≥90%, and the operating pressure is 1.5-2.5MPa; When the reverse osmosis device is used to recover salt, the operating pressure is 2.0 MPa, the reverse osmosis membrane is a polyamide composite membrane, the salt recovery rate is ≥90%, and the concentrated liquid is evaporated and crystallized to obtain sodium chloride.

[0032] Among them, the comparison analysis of the 16S sequencing results of the salt-tolerant strains is shown in Table 1 below: Table 1

[0033] Among them, the comparison analysis of the 16S sequencing results of potassium-solubilizing bacteria, phosphate-solubilizing bacteria and nitrogen-fixing bacteria is shown in Table 2 below: Table 2

[0034] On the other hand, the present invention also provides a dual-function device for reducing salt in kitchen waste and producing bio-organic fertilizer. The dual-function device for reducing salt in kitchen waste and producing bio-organic fertilizer is applicable to the dual-function method for reducing salt in kitchen waste and producing bio-organic fertilizer. like Figure 2-Figure 7 As shown; as an embodiment of the present invention; comprising a first fermentation tank; the first fermentation tank comprising an inner cylinder 1; a cylinder cover is installed on the top of the inner cylinder 1; an outer partition 2 is fixedly installed on the outer side of the inner cylinder 1; An outflow device is installed at the bottom of the inner tube 1; a barrier layer 11 is provided on the top of the outflow device, and the barrier layer 11 is fixedly installed in the inner tube 1; the top of the barrier layer 11 is a curved surface; The outflow device includes an arc-shaped bin 3, and the bottom of the arc-shaped bin 3 is a plane; a liquid outlet pipe 31 is installed at the bottom of the arc-shaped bin 3, and a first valve is installed in the liquid outlet pipe 31; An annular arc plate 32 is fixedly connected to the arc-shaped bin 3, and a gap is left between the annular arc plate 32 and the arc-shaped bin 3; a leakage groove 33 is opened on the surface of the annular arc plate 32, and a filter 34 is installed in each of the leakage grooves 33; A conduit 12 is rotatably mounted in the middle of the barrier layer 11; a drive shaft is fixedly connected to the top of the conduit 12, and the drive shaft extends to the top of the cylinder cover and is connected to the motor; The outer ring of the conduit 12 is fixedly connected to the arc-shaped plate 13, and a flow channel 14 is opened in the arc-shaped plate 13; the outer ring surface of the conduit 12 is opened with evenly arranged grooves 15, and the grooves 15 are connected to the flow channel 14; A fixed pipe 16 is provided below the conduit 12, and the fixed pipe 16 is fixedly connected to the arc-shaped bin 3 through an L-shaped plate; the conduit 12 rotates in the fixed pipe 16; a first solenoid valve is installed in the fixed pipe 16; A plurality of suction pumps 21 are mounted at the bottom of the outer barrier 2; a bottom pipe 22 extends from the bottom of the suction pump 21; two suction pipes 23 are mounted on the bottom pipe 22. The upper suction pipe 23 passes through the annular arc plate 32 and extends above the filter 34. The lower suction pipe 23 extends between the annular arc plates 32 and is aligned with the filter 34. A second solenoid valve is mounted in each of the two suction pipes 23. A top pipe 24 is installed on the top of the suction pump 21, and the top pipe 24 passes through the outer barrier 2 and extends above the outer barrier 2; an outlet pipe 25 is installed on the top pipe 24, and the outlet pipe 25 extends into the inner tube 1; a second valve is installed on the top of each top pipe 24; When treating the waste liquid, the waste liquid is pumped into the inner barrel 1 of the first fermentation tank. The waste liquid will accumulate above the barrier layer 11. Then, water is passed into the outer barrier 2 and the water in the outer barrier 2 is heated by the circulating heating system. After the water in the outer barrier 2 is heated to 90 degrees, the temperature is maintained for one hour, thereby heating the waste liquid in the inner barrel 1 and achieving the purpose of sterilization. The waste liquid in the inner barrel 1 is then naturally cooled to 35 degrees. Then, a salt-tolerant bacterial group is introduced into the inner barrel 1 and the bacteria are allowed to react in the waste liquid at 35 degrees. Specifically, in the process of heating the waste liquid in the inner tube 1 with the hot water in the outer barrier 2, the waste liquid close to the outer barrier 2 will be heated first, and the waste liquid away from the outer barrier 2 will be heated later, resulting in inconsistent heating rates of the waste liquid, thereby reducing the reaction rate of the waste liquid; therefore, in the process of heating the waste liquid in the inner tube 1 with the hot water in the outer barrier 2, the motor is used to control the rotation of the drive shaft, and the rotating drive shaft drives the conduit 12 to rotate. Since the conduit 12 rotates in the fixed tube 16, it rotates along the fixed tube 16. At the same time, the rotating conduit 12 drives the multiple curved plates 13 to rotate. The rotating curved plates 13 can stir the waste liquid in the inner tube 1, thereby causing the waste liquid to flow in the inner tube 1 and perform heat exchange with the hot water in the outer barrier 2; More specifically, the first solenoid valve in the fixed pipe 16 is controlled to open, and the waste liquid above the barrier layer 11 will flow in the flow channel 14 in the arc plate 13, and then flow into the conduit 12 through the notch 15 opened on the conduit 12, and finally flow out from the bottom of the fixed pipe 16. The outflowing waste liquid will gradually fill the annular arc plate 32, and part of the waste liquid will flow into the space between the arc bin 3 and the annular arc plate 32 through the filter screen 34 in the leakage groove 33. Then, the suction pump 21 is controlled to work, and the second solenoid valve in the suction pipe 23 extending to the inside of the annular arc plate 32 is controlled to open, so that the waste liquid in the annular arc plate 32 can be extracted. The extracted waste liquid will first pass through the bottom pipe 22, and then pass through the suction pump 21 and enter The waste liquid flows into the top pipe 24. Since the top pipe 24 passes through the inside of the outer barrier layer 2, the hot water can heat the waste liquid as it flows through. When the waste liquid flows to the top of the top pipe 24, it will flow into the inner tube 1 again through the outlet pipe 25. By extracting the waste liquid from the bottom of the barrier layer 11 and passing the waste liquid through the hot water, and finally entering the inner tube 1 again, the waste liquid in the inner tube 1 can be circulated and heated by the hot water in the outer barrier layer 2, thereby improving the effect of hot water on the waste liquid, accelerating the waste liquid to reach the required reaction temperature, and thus accelerating the reaction rate of the waste liquid. When the waste liquid is in a constant temperature state, the suction pump 21 and the second solenoid valve can be controlled to be closed. Furthermore, when the waste liquid reaction is completed, the bacteria in the waste liquid will naturally settle. At this time, the first control valve is controlled to open, and the liquid in the inner cylinder 1 will flow from the flow channel 14 of the arc plate 13 into the slot 15, and then flow into the annular arc plate 32 through the conduit 12 and the fixed pipe 16. In the process of the waste liquid flowing, the settled bacteria will be driven to flow into the annular arc plate 32, and the waste liquid flowing into the annular arc plate 32 will flow through the filter screen 34 to the arc bin 3 and the annular arc plate 32, and the bacteria will be filtered into the annular arc plate 32. Then the suction pump 21 is controlled to work, and the solenoid valve in the suction pipe 23 between the arc bin 3 and the annular arc plate 32 is controlled to open, so that the waste liquid flowing between the annular arc plate 32 and the arc bin 3 will be extracted. Then, it is introduced into the inner tube 1 again through the top pipe 24 and the outlet pipe 25, and circulates in this way. The bacteria in the waste liquid passing through the annular arc plate 32 are filtered in the annular arc plate 32 to prevent some bacteria in the waste liquid from being in a floating state and being unable to remove these bacteria, thereby affecting the subsequent work of the waste liquid. In the process of filtering the waste liquid, the driving shaft controls the conduit 12 and the arc plate 13 to rotate slowly. The rotating arc plate 13 rotates along the top surface of the barrier layer 11, thereby scraping off the bacteria remaining on the upper surface of the barrier layer 11, and then makes these bacteria pass through the flow channel 14 first, and then flow into the annular arc plate 32 through the conduit 12. In this process, the bacteria removal effect can be further improved, and the content of bacteria in the waste liquid can be reduced. When the waste liquid circulation in the inner tube 1 is completed, all the bacteria in the waste liquid are filtered into the annular arc plate 32, and then the first solenoid valve in the fixed tube 16 is controlled to be closed, and the second solenoid valve in the suction pump 21 and the suction tube 23 are controlled to be closed. At this time, some waste liquid still remains in the annular arc plate 32 and the annular bin. Then the first valve on the liquid outlet pipe 31 is opened, and the bacteria and waste liquid in the annular arc plate 32 will flow out through the liquid outlet pipe 31 and be collected. In the subsequent fertilizer production, since the collected bacteria contain waste liquid, no additional water needs to be added in the subsequent fertilizer production process; the waste liquid is then introduced into the second fermentation tank to continue the reaction.

[0035] As an embodiment of the present invention; the top of the arc-shaped plate 13 is fixedly connected with a blade 17, and the blade 17 is in contact with the inner surface of the inner tube 1; A auger piece 18 is fixedly connected to the middle of the drive shaft; A guide cylinder 19 is provided on the outside of the auger piece 18, and the guide cylinder 19 is fixedly connected to the inner cylinder 1 through a connecting rod; The guide tube 12 extends to one side of the annular arc plate 32 and is fixedly connected to a driving plate; The driving plate is fixedly connected with a cleaning brush layer 35, and the cleaning brush layer 35 is in contact with the surface of the annular arc plate 32; Since the blade 17 is fixedly connected to the arc plate 13, the arc plate 13 rotates, which drives the blade 17 to rotate. The rotating blade 17 increases the stirring amplitude, thereby improving the stirring effect of the waste liquid. At the same time, the blade 17 can scrape off the bacteria adhered to the surface of the inner tube 1, preventing some bacteria from adhering to the inner tube 1 and being unable to be discharged. Specifically, during the reaction of the waste liquid, the drive shaft drives the auger piece 18 to rotate in the guide cylinder 19. The rotating auger piece 18 drives the waste liquid below the inner cylinder 1 to flow upward. When the waste liquid flows to the top of the guide cylinder 19, it will flow out, thereby causing the waste liquid to roll, and causing the waste liquid in the middle of the inner cylinder 1 to flow to both sides and approach the hot water in the outer barrier 2. At the same time, the waste liquids can be mixed with each other, thereby reducing the temperature difference of the waste liquids at different positions, making the reaction rates of the waste liquids at different positions relatively consistent, and controlling the waste liquid to circulate through the outer barrier 2, thereby further improving the heat mitigation effect on the waste liquid. More specifically, during the rotation of the conduit 12, the cleaning brush layer 35 is driven to rotate by the driving plate, and the rotating cleaning brush layer 35 cleans the filter 34, thereby preventing the filter 34 from being blocked and preventing the waste liquid from passing through; Furthermore, when it is necessary to clean the arc-shaped bin 3 and the annular arc plate 32, the top pipe 24 is connected to the external guide pipe, and the external water source is introduced into the top pipe 24. Then, the suction pump 21 is controlled to reverse, so that water can be introduced into the two suction pipes 23 and sprayed out through the suction pipes 23. The water sprayed from the suction pipe 23 at the bottom will pass through the filter screen 34, so that the filter screen 34 can be cleaned, thereby removing the bacteria remaining on the filter screen 34. At the same time, the rotating cleaning brush layer 35 can further improve the cleaning effect of the filter screen 34. Then, the first valve on the liquid outlet pipe 31 is opened, and the bacteria and water will be discharged from the liquid outlet pipe 31. Then, this part of the bacteria and water can be collected.

[0036] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A dual-function method for reducing salt in kitchen waste and producing bio-organic fertilizer; characterized by: The following steps are involved: S1: Separate the waste liquid in the kitchen waste using a solid-liquid separation device, and collect the resulting waste liquid and solid matter separately; S2: using a magnetic pump to pump the waste liquid into a first fermentation tank with a double-layer structure, so that the waste liquid is located in the inner structure of the first fermentation tank, and adding water to the outer structure of the first fermentation tank. Using a circulating heating system to heat the water in the outer structure to sterilize the waste liquid, the waste liquid is naturally cooled after sterilization; S3: Inoculate the salt-tolerant bacteria at a ratio of 2% (v / v) into the first fermentation tank, react for 5-7 days at 30-40°C, and stir with a stirring device. When the pH value of the waste liquid reaches 7.5, let the waste liquid stand for 1-2 days to obtain salt-tolerant bacterial fertilizer; S4: removing the salt-tolerant bacteria in the first fermentation tank, heating the water in the outer layer of the first fermentation tank to sterilize the waste liquid; pumping the waste liquid into the second fermentation tank with a double-layer structure through a magnetic pump, so that the waste liquid is located in the inner layer of the second fermentation tank; then inoculating the growth-promoting bacteria into the second fermentation tank at a ratio of 2% (v / v) of the waste liquid, reacting for 5-7 days at 30-40°C, while stirring with a stirring device, maintaining the pH value of the waste liquid at 7.5, and allowing the waste liquid to stand for 1-2 days to obtain a biological fertilizer; S5: Use a magnetic pump to pump the waste liquid in the second fermentation tank into the decolorization tank, add 10% (w / v) activated carbon powder, 3-5% (w / v) alum and flocculant to the waste liquid, and use a stirring device to stir and decolorize for 12 hours to obtain a supernatant; S6: Use a stainless steel pump to pump the supernatant into a PP membrane device, and use the PP membrane device to remove suspended particles and some colloids in the supernatant; then use a diaphragm pump to pump the supernatant that has passed through the PP membrane device into an ultrafiltration device, a nanofiltration device, and a reverse osmosis device in sequence for further treatment to obtain concentrated salt liquid.

2. The dual-function method for reducing salt in kitchen waste and producing bio-organic fertilizer according to claim 1, characterized in that: The salt-tolerant bacteria group is a mixture of five strains, namely: Nocardia dasonvillei subspecies dasonvillei, Exiguobacterium tsingtaodi, Bacillus millefolium, Priesteria filopodiales and Marinobacterium.

3. The dual-function method for reducing salt in kitchen waste and producing bio-organic fertilizer according to claim 1, characterized in that: The growth-promoting bacteria group is composed of a mixture of potassium-solubilizing bacteria, phosphate-solubilizing bacteria and nitrogen-fixing bacteria; wherein the potassium-solubilizing bacteria include: Bacillus velezensis, Bacillus siamese and Bacillus cabrillais; Phosphate-solubilizing bacteria include: Micromonospora cyanobacteria and Oleobacterium oliveri; Nitrogen-fixing bacteria include: Micromonospora thailandica, Pseudomonas northern guni and Micromonospora citri.

4. The dual-function method for reducing salt in kitchen waste and producing bio-organic fertilizer according to claim 1, characterized in that: The bacteria in the salt-tolerant bacteria group and the growth-promoting bacteria group are activated using LB culture medium; The bacterial species in the salt-tolerant bacterial group and the growth-promoting bacterial group need to be amplified and cultured in a culture medium before being cultured.

5. The dual-function method for reducing salt in kitchen waste and producing bio-organic fertilizer according to claim 1, characterized in that: During the fermentation process of the salt-tolerant bacteria group and the growth-promoting bacteria group in the first fermentation tank and the second fermentation tank, the reaction temperature is 35°C; Air pumps are installed on the top of the first fermentation tank and the second fermentation tank to aerate the waste liquid in the first fermentation tank and the second fermentation tank. The rejection rate of the reverse osmosis device is ≥90%, and the operating pressure is 1.5-2.5 MPa.

6. The dual-function method for reducing salt in kitchen waste and producing bio-organic fertilizer according to claim 1, characterized in that: In S2, the water in the outer structure is heated to a temperature of 90°C. After maintaining this temperature for 1 hour, the circulating heating system is turned off to allow the waste liquid in the first fermentation tank to cool naturally to 35°C. In S3, the stirring device operates at a speed of 200 rpm / min; In S4, the water in the outer structure of the first fermentation tank is heated to a temperature of 90°C. After maintaining this temperature for 1 hour, the circulating heating system is turned off to allow the waste liquid in the first fermentation tank to naturally cool to 35°C; and the operating speed of the stirring device in S4 is 200 rpm / min.

7. A dual-function device for reducing salt in kitchen waste and producing bio-organic fertilizer, characterized by: The dual-function device for reducing salt in kitchen waste and producing bio-organic fertilizer is applicable to the dual-function method for reducing salt in kitchen waste and producing bio-organic fertilizer according to any one of claims 1 to 6; the device comprises a first fermentation tank; the first fermentation tank comprises an inner cylinder (1); a cylinder cover is installed on the top of the inner cylinder (1); an outer partition (2) is fixedly installed on the outer side of the inner cylinder (1); An outflow device is installed at the bottom of the inner cylinder (1); a barrier layer (11) is provided at the top of the outflow device, and the barrier layer (11) is fixedly installed in the inner cylinder (1); the top of the barrier layer (11) is a curved surface; The outflow device comprises an arc-shaped bin (3), and the bottom of the arc-shaped bin (3) is a plane; a liquid outlet pipe (31) is installed at the bottom of the arc-shaped bin (3), and a first valve is installed in the liquid outlet pipe (31); An annular arc plate (32) is fixedly connected to the arc-shaped bin (3), and a gap is left between the annular arc plate (32) and the arc-shaped bin (3); a leakage groove (33) is opened on the surface of the annular arc plate (32), and a filter screen (34) is installed in each leakage groove (33); A conduit (12) is rotatably mounted in the middle of the barrier layer (11); a driving shaft is fixedly connected to the top of the conduit (12), and the driving shaft extends to the top of the cylinder cover and is connected to the motor; The outer ring of the conduit (12) is fixedly connected to the arc-shaped plate (13), and a flow channel (14) is provided in the arc-shaped plate (13); the outer ring surface of the conduit (12) is provided with evenly arranged notches (15), and the notches (15) are communicated with the flow channel (14); A fixed pipe (16) is provided below the conduit (12), and the fixed pipe (16) is fixedly connected to the arc-shaped bin (3) through an L-shaped plate; the conduit (12) rotates in the fixed pipe (16); a first solenoid valve is installed in the fixed pipe (16); A plurality of suction pumps (21) are installed at the bottom of the outer barrier (2); a bottom pipe (22) extends from the bottom of the suction pump (21); two suction pipes (23) are installed on the bottom pipe (22), the upper suction pipe (23) passes through the annular arc plate (32) and extends to the top of the filter (34), and the bottom suction pipe (23) extends between the annular arc plates (32) and is aligned with the filter (34); a second solenoid valve is installed in each of the two suction pipes (23); A top pipe (24) is installed on the top of the suction pump (21), and the top pipe (24) passes through the outer barrier layer (2) and extends to the top of the outer barrier layer (2); an outlet pipe (25) is installed on the top pipe (24), and the outlet pipe (25) extends out of the inner tube (1); a second valve is installed on the top of each top pipe (24).

8. The dual-function equipment for reducing salt in kitchen waste and producing bio-organic fertilizer according to claim 7, characterized in that: A blade (17) is fixedly connected to the top of the arc-shaped plate (13), and the blade (17) is in contact with the inner surface of the inner cylinder (1).

9. The dual-function equipment for reducing salt in kitchen waste and producing bio-organic fertilizer according to claim 8, characterized in that: A auger piece (18) is fixedly connected to the middle portion of the drive shaft; A guide cylinder (19) is provided on the outside of the auger piece (18), and the guide cylinder (19) is fixedly connected to the inner cylinder (1) via a connecting rod.

10. The dual-function equipment for reducing salt in kitchen waste and producing bio-organic fertilizer according to claim 9, characterized in that: The guide tube (12) extends into the annular arc plate (32), and one side thereof is fixedly connected to a driving plate; A cleaning brush layer (35) is fixedly connected to the driving plate, and the cleaning brush layer (35) is in contact with the surface of the annular arc plate (32).

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