CN117327560B - Island organic garbage recycling system and method - Google Patents
Island organic garbage recycling system and method Download PDFInfo
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- C12M21/00—Bioreactors or fermenters specially adapted for specific uses
- C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D36/04—Combinations of filters with settling tanks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
- C12M41/12—Means for regulation, monitoring, measurement or control, e.g. flow regulation of temperature
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Abstract
The invention belongs to the technical field of island organic garbage treatment, and particularly relates to a island organic garbage recycling system and a island organic garbage recycling method. In the system, a first pretreatment device filters and pulverizes domestic organic waste and livestock-raising organic waste to obtain slurry, and a second pretreatment device screens and precipitates the aquaculture organic waste to obtain organic granular waste and concentrated solution; the preparation tank is used for mixing and preparing the slurry, the organic granular waste and the concentrated solution, the acidification sand setting tank is used for acidizing and precipitating the prepared mixed solution, and the anaerobic fermentation tank is used for carrying out anaerobic fermentation on the acidified mixed solution to obtain biogas slurry and biogas; the biogas slurry is concentrated by an evaporation concentration tank to become organic liquid fertilizer, and the biogas is sequentially dehydrated by a steam-water separation tank and desulfurized by a desulfurization tank and then stored in a gas holder. The invention can realize the environment-friendly treatment and reuse of the island organic garbage, thereby realizing the sustainable development of island resource circulation.
Description
Technical Field
The invention belongs to the technical field of island organic garbage treatment, and particularly relates to a island organic garbage recycling system and a island organic garbage recycling method.
Background
The chinese sea area has about 7600 islands of size, with about 450 islands populated by humans. The island has small occupied area, less residents in the island, less available natural resources and unhealthy special living supporting facilities, so that the island has environment particularities of various organic wastes, small volume, miscellaneous states and the like. If the island organic garbage is improperly treated, the water source and the air environment on the island can be affected.
The traditional island organic garbage treatment mode is usually in-situ landfill, incineration and garbage external transportation. However, due to limited island territorial space and resources, island organic waste is not suitable for long-term adoption of in-situ landfill treatment modes in a land life mode; the organic garbage treatment efficiency is low and the pollution is serious in the traditional natural life modes of the rural areas such as incineration and the like; the island organic garbage is packed and transported back to the land garbage factory for treatment, the organic garbage is easy to deteriorate and become smell to influence the environment, and the economic pressure of garbage treatment is greatly increased. Therefore, the current island organic garbage treatment mode is neither environment-friendly nor economical, and the professional sustainable environment-friendly treatment system suitable for island organic garbage treatment is in a blank stage.
Disclosure of Invention
Aiming at the defects existing in the related art, the invention provides a system and a method for recycling island organic garbage, which aim to realize the environment-friendly treatment and recycling of island organic garbage and further realize the sustainable development of island resource recycling.
The invention provides a sea island organic garbage recycling system, which comprises an organic garbage classification pretreatment device, an anaerobic treatment device and a resource recovery device which are sequentially arranged; wherein,
the organic garbage classification pretreatment device comprises a first pretreatment device and a second pretreatment device; the first pretreatment device is used for filtering and crushing the domestic organic waste and the livestock-raising organic waste to obtain slurry; the second pretreatment device is used for screening and precipitating the aquaculture organic waste to obtain organic granular waste and concentrated solution;
the anaerobic treatment device comprises a blending tank, an acidification sand setting tank and an anaerobic fermentation tank which are connected in sequence; the blending tank is used for mixing and blending the slurry, the organic particle waste and the concentrated solution to obtain blended mixed solution; the acidification sand setting tank is used for acidizing and precipitating the blended mixed liquid to obtain an acidified mixed liquid; the anaerobic fermentation tank is used for carrying out anaerobic fermentation on the acidified mixed liquid so as to obtain biogas slurry and biogas;
the resource recovery device comprises a biogas purification device and a biogas slurry fertilizer preparation device; the biogas purification device comprises a steam-water separation tank, a desulfurization tank and a gas holder which are connected in sequence; the biogas outlet of the anaerobic fermentation tank is connected with the inlet of the steam-water separation tank, and biogas sequentially flows through the steam-water separation tank and the desulfurization tank and is stored in the gas holder; the biogas slurry fertilizer preparation device comprises an evaporation concentration tank, wherein a biogas slurry outlet of the anaerobic fermentation tank is connected with an inlet of the evaporation concentration tank, and the biogas slurry is formed into an organic liquid fertilizer after passing through the evaporation concentration tank;
the island organic garbage recycling system also comprises a heating device, wherein the heating device comprises a solar water heater, an electric heater and a constant-temperature hot water storage tank; the constant-temperature hot water storage tank is internally provided with water, and the solar water heater and the electric heater are respectively connected with the constant-temperature hot water storage tank so as to heat the water in the constant-temperature hot water storage tank; the constant-temperature hot water storage tank is connected with the anaerobic fermentation tank to regulate and control the temperature of the anaerobic fermentation tank; the solar water heater and the electric heater are also respectively connected with the evaporation concentration tank so as to regulate and control the temperature of the evaporation concentration tank.
By the technical scheme, the classification pretreatment of the island organic garbage can be realized, and the island organic garbage treatment efficiency can be improved; the environmental protection treatment and the reutilization of the island organic garbage can be realized, so that the island organic garbage is converted into energy and fertilizer for island residents, and further the sustainable development of island resource circulation can be realized; in addition, the mode of providing a heat source by combining solar energy and electric energy can reduce the energy use, and is beneficial to reducing the sea island organic garbage treatment cost.
In some embodiments, the upper part of the anaerobic fermentation tank is connected with an overflow pipe, and the other end of the overflow pipe is communicated with the blending tank, so that biogas slurry in the anaerobic fermentation tank can overflow back into the blending tank through the overflow pipe; and the overflow pipe is also provided with a flow regulating unit so as to regulate and control the biogas slurry amount in the overflow callback distribution tank. According to the technical scheme, the fresh water consumption of the blending tank can be reduced, the defect of island fresh water resource shortage is overcome, and the recycling of biogas slurry is realized.
In some embodiments, the first pretreatment device comprises a mechanical grating and a crushing and sorting integrated machine which are arranged in sequence; the mechanical grating is used for filtering the living organic waste and the livestock-raising organic waste to obtain a fecal solid and a filtrate; the crushing and sorting integrated machine is used for crushing the solid matters of the excrement so as to obtain slurry and uncrushed impurities; the second pretreatment device comprises a sedimentation tank and a rotary screen erected on the sedimentation tank; the drum screen is used for screening the aquaculture organic waste to obtain organic granular waste and screening filtrate; the sedimentation tank is used for precipitating the screen filtrate to obtain concentrated solution and supernatant. The technical scheme realizes the classification pretreatment of the island organic garbage.
In some of these embodiments, the crushing and sorting integrated machine comprises a body, a crushing device, and a slurry transfer device;
the inner cavity of the machine body comprises a slurry cavity and an impurity cavity which are isolated from each other; the upper part of the slurry cavity transversely stretches over a separating cylinder facing the impurity cavity, one end of the separating cylinder far away from the impurity cavity is closed, and one end of the separating cylinder close to the impurity cavity is opened so that the inner cavity of the separating cylinder is communicated with the impurity cavity; a feed inlet penetrating through the top of the machine body is arranged above the separating cylinder, and the solid waste enters the separating cylinder through the feed inlet; the wall of the separating cylinder is provided with a plurality of filtering holes, and the slurry cavity is communicated with the inner cavity of the separating cylinder through the filtering holes; a slurry outlet corresponding to the slurry outlet channel is formed in one side of the slurry cavity, and the slurry outlet is communicated with the blending tank through a pipeline; an impurity outlet is formed in the bottom of the impurity cavity;
the crushing device comprises a crushing motor, a rotating shaft and a plurality of striking rod groups which are arranged convexly at intervals along the axial direction of the rotating shaft, wherein the rotating shaft penetrates through the separating cylinder and is coaxially arranged; one end of the rotating shaft is connected with an output shaft of the crushing motor so as to rotate under the drive of the crushing motor, and the solid waste in the separating cylinder is crushed by a plurality of striking rod groups so as to obtain slurry and uncrushed impurities; the slurry enters the slurry cavity through the filtering holes, and the unbroken impurities enter the impurity cavity and are output outwards through the impurity outlet;
the slurry transferring device comprises a conveying motor and a conveying shaft, wherein the conveying shaft penetrates through the slurry outlet channel and is coaxially arranged; the conveying shaft is provided with a spiral blade extending towards the slurry outlet along the axial direction of the conveying shaft; one end of the conveying shaft is connected with an output shaft of the conveying motor so as to rotate under the driving of the conveying motor, and the slurry in the slurry cavity is output outwards through the slurry outlet by the spiral blades.
The technical scheme realizes the integrated operation function of crushing and separating the solid waste, and achieves the purposes of simplified working procedures, improved efficiency, reduced cost and convenient implementation.
In some embodiments, each of the plurality of striking rod sets includes a plurality of striking rods projecting at intervals around the shaft; one end of each striking rod far away from the rotating shaft is inclined towards the direction of the impurity cavity; the striking rod is a hard rubber rod. This technical scheme is convenient for carry the impurity that is not broken in the separating drum to impurity chamber direction.
In some of these embodiments, the volume of the tank is adjustedSetting according to the formula (1); the liquid amount of the biogas slurry overflowed and flowing back into the blending tank is +.>Regulating according to formula (2); capacity of acidifying sand setting tank>Setting according to formula (3); anaerobic fermentation tank volume->Setting according to formula (4); volume of gas holder->Setting according to formula (5);
（1）；
（2）；
（3）；
（4）；
（5）；
in the formulas (1) to (5),
design coefficients for the volume of the formulation tank, +.>；/>For the first fitting coefficient, ++>；/>For the second fitting coefficient, ++>；/>The slurry is uniformly fed into the blending tank every day; />The organic granular waste entering the blending tank every day is uniform;
designing coefficients for the volume of the acidified sand setting tank; when the content of fruits and vegetables in the domestic organic waste and the livestock-raising organic waste is more than or equal to 60%, the fruits and vegetables are in the formula I>The method comprises the steps of carrying out a first treatment on the surface of the When the content of fruits and vegetables is less than or equal to 20 percent, the fruits and vegetables are added with the water>The method comprises the steps of carrying out a first treatment on the surface of the When the fruit and vegetable content is between 20% and 60%,；
designing coefficients for the volume of the anaerobic fermentation tank; when the content of fruits and vegetables is more than or equal to 60 percent, the content of the fruits and vegetables is more than or equal to the content of the vegetables>The method comprises the steps of carrying out a first treatment on the surface of the When the content of fruits and vegetables is less than or equal to 20 percent，/>The method comprises the steps of carrying out a first treatment on the surface of the When the content of fruits and vegetables is between 20% and 60%>；
Design coefficients for the volume of the gas holder, +.>。
The invention also provides a recycling method of the island organic garbage, which is carried out by adopting the recycling system of the island organic garbage and comprises the following steps:
the organic garbage classification pretreatment step specifically comprises the following steps:
filtering the domestic organic waste and the livestock-raising organic waste by utilizing a mechanical grating to obtain a fecal solid and a filtrate; outputting the filtrate into a sewage treatment system; conveying the solid waste into a crushing and sorting integrated machine for crushing to obtain slurry and uncrushed impurities; conveying the uncrushed impurities to a landfill; delivering the slurry into a blending tank;
screening the aquaculture organic waste by using a drum screen to obtain organic granular waste and screening filtrate; precipitating the screened filtrate by using a precipitation tank to obtain concentrated solution and supernatant; outputting the supernatant into a circulating water culture system; conveying the organic granular waste and the concentrated solution into a blending tank;
mixing the slurry, the organic particle waste and the concentrated solution in the mixing tank, adding water for mixing to obtain mixed solution after mixing, and enabling the solid content of the mixed solution to reach 15% -18%; conveying the blended mixed solution into an acidification sand setting tank;
acidifying and precipitating the mixed liquid after the preparation in the acidifying and precipitating tank to obtain acidified mixed liquid and residues; delivering the residue to a landfill; conveying the acidified mixed solution into an anaerobic fermentation tank;
anaerobic fermentation, namely anaerobic fermentation is carried out on the acidified mixed liquid in the anaerobic fermentation tank to obtain biogas, biogas slurry and biogas residue; conveying the biogas residues to a landfill; respectively conveying the biogas and the biogas slurry to a biogas purification device and a biogas slurry fertilizer preparation device;
the resource recovery step specifically comprises the following steps: the biogas is stored in a gas holder after sequentially undergoing dehydration treatment of a steam-water separation tank and desulfurization treatment of a desulfurization tank; the biogas slurry is concentrated by an evaporation concentration tank to obtain the organic liquid fertilizer.
In some embodiments, in the anaerobic fermentation step, water in the constant-temperature hot water storage tank is heated in a mode of mainly using a solar water heater and standby using an electric heater, so that the temperature of the anaerobic fermentation tank is regulated and controlled; in the resource recovery step, the temperature of the evaporation concentration tank is regulated and controlled in a mode that a solar water heater is used as a main part and an electric heater is used as a standby part.
In some embodiments, in the anaerobic fermentation step, part of the biogas slurry in the anaerobic fermentation tank overflows back into the blending tank through the overflow pipe, and the flow regulating unit regulates and controls the biogas slurry amount overflowed back into the blending tank.
Based on the technical scheme, the island organic garbage recycling system and the island organic garbage recycling method solve the defects of the traditional island organic garbage treatment mode, realize the environment-friendly treatment and recycling of the island organic garbage, convert the island organic garbage into energy and fertilizer for island residents, and realize the sustainable development of island resource recycling.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of the equipment composition of the island organic waste recycling system of the present invention;
FIG. 2 is a schematic flow chart of the method for recycling island organic garbage according to the present invention;
FIG. 3 is a schematic diagram showing the whole structure of a crushing and sorting integrated machine in the invention;
FIG. 4 is a schematic diagram of the whole structure of the crushing and sorting integrated machine in the invention II;
FIG. 5 is a cross-sectional view of the crushing and sorting integrated machine according to the present invention;
FIG. 6 is a second cross-sectional view of the crushing and sorting integrated machine according to the invention;
FIG. 7 is a schematic structural view of a crushing device of the crushing and sorting integrated machine in the invention;
fig. 8 is a schematic structural view of a slurry transferring device of the crushing and sorting integrated machine in the invention.
In the figure:
1. a mechanical grating; 2. crushing and sorting integrated machine; 21. a body; 211. a slurry chamber; 212. an impurity chamber; 213. a pulp outlet channel; 214. a slurry outlet; 215. an impurity outlet; 216. a cleaning port; 22. a separation cylinder; 221. a feed inlet; 222. a filter hole; 23. a rotating shaft; 24. striking the stick; 25. a crushing motor; 26. a conveying shaft; 261. a helical blade; 27. a conveying motor; 3. a drum screen; 4. a sedimentation tank; 5. a conveyor; 6. a blending tank; 61. a PH meter; 62. a liquid level switch; 7. acidifying the sand setting tank; 8. an anaerobic fermentation tank; 81. an overflow pipe; 82. a temperature sensor; 83. a pressure sensor; 84. PH+T+OPR tester; 9. an evaporation concentration tank; 10. a steam-water separation tank; 11. a desulfurizing tank; 12. a gas holder; 13. a gas flow meter; 14. a biogas component analyzer; 15. a positive and negative pressure protector; 16. a solar water heater; 17. an electric heater; 18. a constant temperature hot water storage tank.
Detailed Description
The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center," "lateral," "longitudinal," "upper," "lower," "top," "bottom," "inner," "outer," "left," "right," "front," "rear," "vertical," "horizontal," etc. indicate or refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of describing the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1 and 2, the invention provides a sea island organic garbage recycling system, which comprises an organic garbage classification pretreatment device, an anaerobic treatment device and a resource recovery device which are sequentially arranged.
The organic garbage classification pretreatment device comprises a first pretreatment device and a second pretreatment device. The first pretreatment device is used for filtering and crushing the domestic organic waste and the livestock-raising organic waste to obtain slurry formed after filtering and crushing; the domestic organic waste is domestic organic waste generated in daily life of island residents and mainly comprises food waste, fruit and vegetable waste, toilet excrement and the like; the livestock-raising organic waste refers to organic waste for raising produced by island residents during livestock-raising, and mainly comprises feed residues, livestock and poultry manure and the like. The second pretreatment device is used for carrying out screening and precipitation treatment on the aquaculture organic waste to obtain screened and precipitated organic granular waste and concentrated solution; the organic waste of aquiculture refers to the culture treatment liquid generated when residents in islands carry out aquiculture, and mainly contains feed residues, aquatic product excreta, suspended matters and the like; the aquaculture treatment fluid can be directly extracted from the aquaculture circulating water aquaculture system.
The anaerobic treatment device comprises a blending tank 6, an acidification sand setting tank 7 and an anaerobic fermentation tank 8 which are connected in sequence. The blending tank 6 receives and accommodates the slurry output by the first pretreatment device and the organic particle waste and the concentrated solution output by the second pretreatment device, and mixes and adds water to blend the slurry, the organic particle waste and the concentrated solution in the tank to obtain blended mixed solution, and then the blended mixed solution is conveyed into the acidified sand setting tank 7; it can be understood that the mixing tank 6 is internally provided with a stirring device for more uniformly and efficiently mixing the mixed liquid; the compounding tank 6 is provided with a PH meter 61 and a level switch 62 to monitor the state of the mixed liquid in the tank. The mixed liquid prepared in the acidification sand setting tank 7 is naturally acidified and precipitated to obtain acidified mixed liquid, and then the acidified mixed liquid is conveyed into the anaerobic fermentation tank 8. Anaerobic fermentation treatment is carried out on the mixed liquid after acidification in the anaerobic fermentation tank 8, and organic matters in the mixed liquid are converted through anaerobic bacteria so as to obtain biogas slurry and biogas; it can be understood that the anaerobic fermentation tank 8 is also internally provided with a stirring device for improving the dissolved oxygen rate, enhancing the metabolism activity of microorganisms and ensuring the uniformity of the reaction quality; anaerobic fermentation tank 8 is equipped with a temperature sensor 82, a pressure sensor 83, and a PH + T + OPR tester 84 to monitor the status of the tank contents.
The resource recovery device comprises a biogas purification device and a biogas slurry fertilizer preparation device. The biogas purification device comprises a steam-water separation tank 10, a desulfurization tank 11 and a gas holder 12 which are connected in sequence. The top of the anaerobic fermentation tank 8 is provided with a methane outlet which is connected with the inlet of the steam-water separation tank 10; the biogas sequentially flows through a steam-water separation tank 10 for dehydration treatment and a desulfurization tank 11 for desulfurization treatment and then is stored in a gas holder 12. The biogas in the gas holder 12 is extracted and used by users when needed, such as being used as fuel or generating power by biogas, so as to meet the living needs of residents in islands. Further, a gas flowmeter 13, a biogas component analyzer 14, a positive and negative pressure protector 15 and the like are arranged on the connecting pipeline from the anaerobic fermentation tank 8 to the steam-water separation tank 10; the gas flowmeter 13 is used for metering and monitoring the biogas flowing out of the anaerobic fermentation tank 8; the biogas component analyzer 14 is used for analyzing and monitoring the components of the biogas flowing out of the anaerobic fermentation tank 8; the positive and negative pressure protector 15 is used for providing guarantee for the safe operation of the anaerobic fermentation tank 8. The biogas slurry fertilizer preparation device comprises an evaporation concentration tank 9. The lower part of the anaerobic fermentation tank 8 is provided with a biogas slurry outlet which is connected with the inlet of the evaporation concentration tank 9; the biogas slurry is concentrated by an evaporation concentration tank 9 to form an organic liquid fertilizer for crop fertilization, so that the cultivation and fertilization requirements of island residents are met.
The island organic garbage recycling system also comprises a heating device, wherein the heating device comprises a solar water heater 16, an electric heater 17 and a constant-temperature hot water storage tank 18; it will be appreciated that the solar water heater 16 uses solar energy to provide a source of heat and the electric heater 17 uses electrical energy to provide a source of heat. The constant temperature hot water storage tank 18 is filled with water, the solar water heater 16 and the electric heater 17 are respectively connected with the constant temperature hot water storage tank 18, and both can heat and preserve heat of the water in the constant temperature hot water storage tank 18 so as to keep the water in the constant temperature hot water storage tank 18 within a preset temperature range. The constant-temperature hot water storage tank 18 is connected with the anaerobic fermentation tank 8 through a circulating water loop, constant-temperature circulating water of the constant-temperature hot water storage tank 18 circularly flows through the circulating water loop to regulate and control the temperature of the anaerobic fermentation tank 8, so that the temperature of the anaerobic fermentation tank 8 is kept at a preset fermentation temperature, the anaerobic fermentation effect is ensured, and the preparation of methane and biogas slurry is realized. The solar water heater 16 and the electric heater 17 are also respectively connected with the evaporation and concentration tank 9, and can heat and preserve heat of the evaporation and concentration tank 9, and regulate and control the temperature of the evaporation and concentration tank 9, so that the temperature of the evaporation and concentration tank 9 is kept at a preset concentration temperature, the biogas slurry evaporation and concentration effect is ensured, and the preparation of the organic liquid fertilizer is realized.
According to the above-mentioned exemplary embodiment, through the arrangement of the organic garbage classification pretreatment device, targeted pretreatment can be performed according to different types of characteristics of the island organic garbage, so that the island organic garbage classification pretreatment is realized, and the island organic garbage treatment efficiency is improved; through the arrangement of the anaerobic treatment device and the resource recovery device, the environment-friendly treatment and the reutilization of the island organic garbage can be realized, so that the island organic garbage is converted into energy and fertilizer for island residents, and further the sustainable development of island resource circulation can be realized; moreover, the temperature of the anaerobic fermentation tank 8 and the temperature of the evaporation concentration tank 9 are regulated and controlled by the arrangement of the heating device, so that the anaerobic fermentation effect and the biogas slurry evaporation concentration effect are ensured; in addition, the mode of providing a heat source by combining solar energy and electric energy can reduce the energy use, and is beneficial to reducing the sea island organic garbage treatment cost.
Referring to fig. 1 and 2, in some embodiments, an overflow port is provided at the upper part of the anaerobic fermentation tank 8, and an overflow pipe 81 is connected to the overflow port, and the other end of the overflow pipe 81 is communicated with the blending tank 6. Through the arrangement of the overflow pipe 81, part of biogas slurry in the anaerobic fermentation tank 8 overflows back into the preparation tank 6 through the overflow pipe 81. The overflow pipe 81 is also provided with a flow regulating unit to regulate and control the biogas slurry amount in the overflow callback distribution tank 6. According to the illustrative embodiment, through the arrangement of the overflow pipe 81, part of biogas slurry can overflow back into the blending tank 6, on one hand, the overflow biogas slurry is used as the supplementary liquid of the blending tank 6, so that the fresh water usage amount of the blending tank 6 can be reduced, the defect of island fresh water resource shortage is overcome, and the recycling of the biogas slurry is realized; on the other hand, the overflow biogas slurry contains various moulds generated by anaerobic fermentation, which is beneficial to improving the acidification efficiency of the mixed liquid after the preparation.
Referring to fig. 1 and 2, in some embodiments, the first pretreatment device includes a mechanical grating 1 and a crushing and sorting integrated machine 2 that are disposed in sequence. The mechanical grating 1 is used for filtering domestic organic waste and livestock-raising organic waste to obtain filtrate and unfiltered fecal solids; the filtrate is output to a sewage treatment system for treatment, and the solid waste is conveyed to the crushing and sorting integrated machine 2. The crushing and sorting integrated machine 2 is used for crushing the solid matters of the excrement so as to obtain slurry and uncrushed impurities; the slurry is delivered to the deployment tank 6 and the uncrushed impurities are delivered to a landfill for landfill treatment. The second pretreatment device comprises a sedimentation tank 4 and a rotary screen 3 arranged on the sedimentation tank 4. The drum screen 3 is used for screening the aquaculture organic waste to obtain a screened liquid and organic granular waste which is not screened out; the organic particulate waste will be transported by conveyor 5 into a blending tank 6 and the screen filtrate into a settling tank 4. The sedimentation tank 4 is used for carrying out sedimentation treatment on the screened filtrate so as to separate the liquid in the sedimentation tank 4 into supernatant liquid positioned at the upper layer and concentrated liquid positioned at the lower layer; the supernatant is output into a circulating water supplementing pool and then enters a circulating water culture system for use; the concentrate will be delivered into the compounding tank 6. According to the method, the arrangement of the first pretreatment device and the second pretreatment device is thinned, classification pretreatment of the island organic garbage can be better achieved, and improvement of island organic garbage treatment efficiency is facilitated.
Referring to fig. 3-8, in some embodiments, the crushing and sorting integrated machine 2 includes a machine body 21, a stand, a crushing device, and a slurry transfer device.
The inner cavity of the body 21 includes a slurry cavity 211 and an impurity cavity 212 isolated from each other. A separating tube 22 extending from the upper part of the slurry chamber 211 toward the impurity chamber 212; the end of the separating tube 22 away from the impurity cavity 212 is closed, and the end close to the impurity cavity 212 is opened so that the inner cavity of the separating tube 22 is communicated with the impurity cavity 212; i.e. the separation cylinder 22 is located in the slurry chamber 211, the separation cylinder 22 being axially horizontally arranged and extending towards the impurity chamber 212. A feed inlet 221 penetrating through the top of the machine body 21 is arranged above the separating cylinder 22, and the solid waste enters the separating cylinder 22 through the feed inlet 221. The wall of the separating cylinder 22 is provided with a plurality of filtering holes 222, and the slurry cavity 211 is communicated with the inner cavity of the separating cylinder 22 through the filtering holes 222; further, the wall of the separating tube 22 is uniformly and densely provided with the filtering holes 222 along the axial direction and the circumferential direction, and the diameter of the filtering holes 222 is usually less than 3mm, but the invention is not limited thereto, and the filtering holes can be flexibly arranged according to practical needs. A slurry outlet channel 213 is concavely arranged at the bottom of the slurry cavity 211, and the inner wall of the slurry outlet channel 213 is arc-shaped. One side of the slurry cavity 211 is provided with a slurry outlet 214 corresponding to the slurry outlet channel 213, and the slurry outlet 214 is communicated with the blending tank 6 through a pipeline. The bottom of the impurity chamber 212 is provided with an impurity outlet 215.
The crushing device comprises a crushing motor 25, a rotating shaft 23 and a plurality of striking rod 24 groups which are arranged at intervals along the axial direction of the rotating shaft 23. The rotating shaft 23 penetrates through the separating cylinder 22 and is coaxially arranged, and two ends of the rotating shaft 23 are respectively connected to the machine body 21 in a rotating way through bearing assemblies; the outer dimensions of the set of impact bars 24 are smaller than the inner diameter of the separating cylinder 22; the crushing motor 25 is positioned outside the machine body 21, and one end of the rotating shaft 23 is also connected with an output shaft of the crushing motor 25 through a coupler. When the crushing motor 25 is started, the rotating shaft 23 is driven to rotate at a high speed to drive the striking rod 24 group to rotate, and when the striking rod 24 group rotates, the excrement solid matters in the separating cylinder 22 are struck, so that the excrement solid matters are crushed into slurry and uncrushed impurities. In the impact crushing process, the slurry smaller than the diameter of the filter holes 222 enters the slurry cavity 211 through the filter holes 222, and the uncrushed impurities are finally conveyed into the impurity cavity 212 at one end of the separation cylinder 22 and are then output outwards through the impurity outlet 215.
The slurry transfer device includes a conveyor motor 27 and a conveyor shaft 26. The conveying shaft 26 penetrates through the pulp outlet channel 213 and is coaxially arranged; the end of the conveying shaft 26 remote from the slurry outlet 214 is rotatably connected to the body 21 by a bearing assembly; the conveying motor 27 is positioned outside the machine body 21, and one end of the conveying shaft 26, which is far away from the slurry outlet 214, is also connected with an output shaft of the conveying motor 27 through a coupling. The conveying shaft 26 is provided with a spiral blade 261 extending toward the slurry outlet 214 in the axial direction thereof, and the outer diameter of the spiral blade 261 is adapted to the inner diameter of the slurry outlet passage 213. When the conveying motor 27 is started, the conveying shaft 26 is driven to rotate so as to drive the spiral blades 261 to rotate, and the slurry in the slurry cavity 211 is pushed to be output outwards through the slurry outlet 214.
Further, at least one cleaning opening 216 is formed on the machine body 21 to connect with a high-pressure water pump to spray and clean the separation barrel 22 and the slurry cavity 211.
The above-mentioned exemplary embodiment realizes the integrated structural design of the crushing and sorting integrated machine 2 through the arrangement of the separating cylinder 22, the crushing device and the slurry transferring device, realizes the crushing and separating integrated operation function of the solid matters of the excrement, and achieves the purposes of simplified working procedures, improved efficiency, reduced cost and convenient implementation.
Referring to fig. 5 and 7, in some embodiments, each set of striking rods 24 includes a plurality of striking rods 24 protruding at intervals around the axis of rotation 23; the striking rod 24 is a hard rubber rod. It will be appreciated that the striking rod 24 is rod-shaped, with one end connected to the shaft 23 and the other end protruding from the shaft 23 but located within the separating cylinder 22. One end of each striking rod 24, which is far away from the rotating shaft 23, is inclined towards the impurity cavity 212; the inclination angle is not too large and can be set to be 5-15 degrees, but the inclination angle is not limited to the angle, and the inclination angle can be flexibly set according to actual conditions; therefore, when the rotating shaft 23 rotates at a high speed, the uncrushed impurities in the separating cylinder 22 are slowly pushed to the impurity cavity 212 under the rotating action of the striking rod 24 group in an inclined state; during this process, the crushed slurry enters the slurry chamber 211 from the filter holes 222 and is not carried into the impurity chamber 212. The illustrative embodiment facilitates the transport of uncrushed impurities within the separation barrel 22 toward the impurity chamber 212 by the angled arrangement of the striking rod 24.
In some embodiments, the volume of the compounding tank 6Setting according to the formula (1); the amount of biogas slurry overflowed and flowing back into the blending tank 6 is +.>Regulating according to formula (2); the volume of the acidified sand setting tank 7>Setting according to formula (3); anaerobic fermentation tank 8 volume ∈>Setting according to formula (4); the volume of the gas holder 12->Setting according to formula (5);
（1）；
（2）；
（3）；
（4）；
（5）；
in the formulas (1) to (5),
design coefficients for the volume of the compounding tank 6, +.>；/>For the first fitting coefficient, ++>；/>For the second fitting coefficient, ++>；/>The unit is cubic meters for the slurry average amount entering the blending tank 6 every day; />The unit is cubic meters for the average amount of the organic particle waste entering the blending tank 6 every day;
for acidification and sedimentationThe volume design factor of the sand tank 7, which is related to the acidification time; when the content of fruits and vegetables in the domestic organic waste and the livestock-raising organic waste is more than or equal to 60%, the fruits and vegetables are in the formula I>The method comprises the steps of carrying out a first treatment on the surface of the When the content of fruits and vegetables is less than or equal to 20 percent, the fruits and vegetables are added with the water>The method comprises the steps of carrying out a first treatment on the surface of the When the content of fruits and vegetables is between 20% and 60%>；
Designing a coefficient for the volume of anaerobic fermentation tank 8, the coefficient being related to anaerobic residence time; when the content of fruits and vegetables is more than or equal to 60 percent, the content of the fruits and vegetables is more than or equal to the content of the vegetables>The method comprises the steps of carrying out a first treatment on the surface of the When the content of fruits and vegetables is less than or equal to 20 percent, the fruits and vegetables are added with the water>The method comprises the steps of carrying out a first treatment on the surface of the When the fruit and vegetable content is between 20% and 60%,；
design coefficients for the volume of the gas holder 12, +.>And (5) taking a value according to the field and the use frequency.
Further, biogas production can be performed by the formula (6)The evaluation calculation of (2) can be carried out by the formula (7) for the yield of organic liquid fertilizer>Is calculated by the evaluation of (a);wherein (1)>For efficiency factor, +.>The method comprises the steps of carrying out a first treatment on the surface of the Therefore, the resource recovery yield after the island organic garbage is recycled can be evaluated, and references are provided for project planning implementation;
（6）；
（7）。
according to the above-mentioned exemplary embodiment, the volume designs of the blending tank 6, the acidification sand setting tank 7, the anaerobic fermentation tank 8 and the gas holder 12 are associated with daily treatment capacity of the island organic garbage, on the premise of meeting garbage treatment requirements, the optimization setting of the volumes of all the devices and the regulation and control of overflow biogas slurry liquid are realized, and further, the evaluation and calculation of the biogas yield and the organic liquid fertilizer yield after the island organic garbage treatment are realized, so that the planning and design, benefit evaluation, popularization and application of the island organic garbage recycling system are facilitated.
In some embodiments, the mechanical grating 1, the crushing and sorting integrated machine 2, the rotary screen 3, the sedimentation tank 4, the blending tank 6, the acidification sand setting tank 7, the anaerobic fermentation tank 8, the evaporation concentration tank 9, the steam-water separation tank 10, the desulfurization tank 11 and the gas holder 12 are all arranged by adopting a skid-mounted body structure; therefore, damage to the geology of the island is avoided, the construction of the island organic garbage recycling system is more flexible and convenient, and the equipment is convenient to move.
Referring to fig. 1-8, the invention also provides a method for recycling the island organic garbage, which is performed by adopting the island organic garbage recycling system. The method comprises the following steps:
the organic garbage classification pretreatment step specifically comprises the following steps:
filtering the domestic organic waste and the livestock-raising organic waste by using a mechanical grating 1 to obtain a fecal solid and a filtrate; outputting the filtrate into a sewage treatment system for treatment; conveying the solid waste into a crushing and sorting integrated machine 2 for crushing to obtain slurry and uncrushed impurities; conveying the uncrushed impurities to a landfill site for landfill treatment; delivering the slurry into the blending tank 6;
screening the aquaculture organic waste by using a rotary screen 3 to obtain organic granular waste and screening filtrate; precipitating the screened filtrate by using a precipitation tank 4 to obtain concentrated solution and supernatant; outputting the supernatant into a circulating water supplementing pond, and then flowing into a circulating water culture system for recycling; delivering the organic granular waste and the concentrated solution into a blending tank 6;
mixing the slurry, the organic particle waste and the concentrated solution in the mixing tank 6, adding water for mixing to obtain mixed solution after mixing, and enabling the solid content of the mixed solution to reach 15% -18%; conveying the blended mixed solution into an acidification sand setting tank 7;
acidifying and precipitating the mixed liquid after being prepared in the acidifying and precipitating tank 7 to obtain acidified mixed liquid and residues; the residue is periodically conveyed to a landfill site for landfill treatment; conveying the acidified mixed solution into an anaerobic fermentation tank 8;
anaerobic fermentation, namely anaerobic fermentation is carried out on the acidified mixed liquid in the anaerobic fermentation tank 8 to obtain biogas, biogas slurry and biogas residue; the biogas residues are periodically conveyed to a landfill site for landfill treatment; respectively conveying the biogas and the biogas slurry to a biogas purification device and a biogas slurry fertilizer preparation device;
the resource recovery step specifically comprises the following steps: after being output from the anaerobic fermentation tank 8, the biogas is sequentially dehydrated by the steam-water separation tank 10 and desulfurized by the desulfurization tank 11 and then stored in the gas holder 12 for extraction and use when required by users, such as being used as fuel or generating electricity by biogas; the biogas slurry is output from the anaerobic fermentation tank 8 and is concentrated by the evaporation concentration tank 9 to become organic liquid fertilizer for crop fertilization.
The above-mentioned exemplary embodiment has solved the defect of traditional island organic rubbish treatment mode, has realized island organic rubbish's environmental protection treatment and reuse, makes island organic rubbish turn into energy and fertilizer for island resident's usefulness, improves resource utilization efficiency, realizes island resource circulation sustainable development, has filled island organic rubbish's the sustainable environmental protection processing system's of specialty blank.
Referring to fig. 1 and 2, in some embodiments, in the anaerobic fermentation step, the water in the constant-temperature hot water storage tank 18 is heated by using a solar water heater 16 as a main and an electric heater 17 as a standby, so as to regulate and control the temperature of the anaerobic fermentation tank 8. In the resource recovery step, the temperature of the evaporation and concentration tank 9 is regulated and controlled by adopting a mode that the solar water heater 16 is mainly used and the electric heater 17 is standby. According to the method, the heat source is provided in a mode of mainly using solar energy and standby using electric energy, so that natural resources can be fully utilized, the energy use is reduced to the maximum extent, and the sea island organic garbage treatment cost is reduced.
Referring to fig. 1 and 2, in some embodiments, in the anaerobic fermentation step, part of the biogas slurry in the anaerobic fermentation tank 8 overflows back into the preparation tank 6 through the overflow pipe 81, and the flow regulating unit regulates the amount of the biogas slurry overflowed back into the preparation tank 6. According to the embodiment, the fresh water consumption of the blending tank 6 is reduced, the defect of island fresh water resource shortage is overcome, and the biogas slurry recycling is realized.
In conclusion, the island organic garbage recycling system adopts the skid-mounted body structure, has strong environmental adaptability, avoids damaging the island geology, occupies small area and is convenient to move; the method for recycling the island organic garbage realizes the classification pretreatment and the environmental protection treatment of the island organic garbage, has small garbage amount to be buried after the treatment and high treatment efficiency, converts the island organic garbage into energy and fertilizer for island residents, realizes the sustainable development of island resource recycling, and fills the blank of a professional sustainable environmental protection treatment system for the island organic garbage treatment.
Finally, it should be noted that: in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (4)
1. The island organic garbage recycling method is characterized in that the island organic garbage recycling system is adopted,
the island organic garbage recycling system comprises an organic garbage classification pretreatment device, an anaerobic treatment device and a resource recovery device which are sequentially arranged; wherein,
the organic garbage classification pretreatment device comprises a first pretreatment device and a second pretreatment device; the first pretreatment device comprises a mechanical grating and a crushing and sorting integrated machine which are sequentially arranged, wherein the mechanical grating is used for filtering domestic organic waste and livestock-raising organic waste so as to obtain excrement solid and filtrate; the crushing and sorting integrated machine is used for crushing the solid matters of the excrement to obtain slurry and uncrushed impurities; the crushing and sorting integrated machine comprises a machine body, a crushing device and a slurry transferring device; the inner cavity of the machine body comprises a slurry cavity and an impurity cavity which are isolated from each other; the upper part of the slurry cavity transversely stretches through a separating cylinder facing the impurity cavity, one end of the separating cylinder far away from the impurity cavity is closed, and one end of the separating cylinder close to the impurity cavity is opened so that the inner cavity of the separating cylinder is communicated with the impurity cavity; a feed inlet penetrating through the top of the machine body is arranged above the separating cylinder, and the fecal sewage solid matters enter the separating cylinder through the feed inlet; the wall of the separating cylinder is provided with a plurality of filtering holes, and the slurry cavity is communicated with the inner cavity of the separating cylinder through the filtering holes; a slurry outlet corresponding to the slurry outlet channel is formed in one side of the slurry cavity, and the slurry outlet is communicated with the blending tank through a pipeline; an impurity outlet is formed in the bottom of the impurity cavity; the crushing device comprises a crushing motor, a rotating shaft and a plurality of striking rod groups which are arranged in a protruding mode at intervals along the axial direction of the rotating shaft, wherein the rotating shaft penetrates through the separating cylinder and is coaxially arranged; one end of the rotating shaft is connected with an output shaft of a crushing motor so as to rotate under the drive of the crushing motor, and the solid waste in the separating cylinder is crushed by beating through a plurality of beating rod groups so as to obtain slurry and uncrushed impurities; the slurry enters the slurry cavity through the filtering holes, and the uncrushed impurities enter the impurity cavity and are output outwards through the impurity outlet; the slurry transferring device comprises a conveying motor and a conveying shaft, wherein the conveying shaft penetrates through the slurry outlet channel and is coaxially arranged; the conveying shaft is provided with a spiral blade extending towards the slurry outlet along the axial direction of the conveying shaft; one end of the conveying shaft is connected with an output shaft of the conveying motor so as to be driven by the conveying motor to rotate, and the slurry in the slurry cavity is output outwards through the slurry outlet by the spiral blades; the second pretreatment device comprises a sedimentation tank and a rotary screen arranged on the sedimentation tank; the rotary screen is used for screening the aquaculture organic waste to obtain organic granular waste and screening filtrate; the sedimentation tank is used for precipitating the screened filtrate to obtain concentrated solution and supernatant;
the anaerobic treatment device comprises a blending tank, an acidification sand setting tank and an anaerobic fermentation tank which are connected in sequence; the blending tank is used for mixing and blending the slurry, the organic particle waste and the concentrated solution to obtain blended mixed solution; the acidification sand setting tank is used for acidizing and precipitating the blended mixed liquid to obtain an acidified mixed liquid; the anaerobic fermentation tank is used for carrying out anaerobic fermentation on the acidified mixed liquid so as to obtain biogas slurry and biogas; the upper part of the anaerobic fermentation tank is connected with an overflow pipe, and the other end of the overflow pipe is communicated with the blending tank, so that part of biogas slurry in the anaerobic fermentation tank can overflow back into the blending tank through the overflow pipe; the overflow pipe is also provided with a flow regulating unit for regulating and controlling the liquid quantity of the biogas slurry flowing back into the blending tank; the volume of the blending tankSetting according to the formula (1); the amount of biogas slurry overflowed back into the blending tank is +.>Regulating according to formula (2); the capacity of the acidification sand setting tank>Setting according to formula (3); the volume of the anaerobic fermentation tank>Setting according to formula (4);
（1）；
（2）；
（3）；
（4）；
in the formulas (1) to (4),designing coefficients for the volume of the formulation tank, < >>；/>For the first coefficient of deployment,；/>for the second fitting coefficient, ++>；/>The slurry average amount entering the blending tank every day;the organic granular waste entering the blending tank every day is uniform; />Designing coefficients for the volume of the acidified sand setting tank; when the content of fruits and vegetables in the domestic organic waste and the livestock-raising organic waste is more than or equal to 60%, the fruits and vegetables are in the formula I>The method comprises the steps of carrying out a first treatment on the surface of the When the content of the fruits and vegetables is less than or equal to 20 percent, the fruits and vegetables are in a state of being not more than 20 percent>The method comprises the steps of carrying out a first treatment on the surface of the When the content of the fruits and vegetables is between 20% and 60%>；/>Designing coefficients for the volume of the anaerobic fermentation tank; when the content of the fruits and vegetables is more than or equal to 60 percent, the fruits and vegetables are in a state of being in a state>The method comprises the steps of carrying out a first treatment on the surface of the When the content of the fruits and vegetables is less than or equal to 20 percent, the fruits and vegetables are in a state of being not more than 20 percent>The method comprises the steps of carrying out a first treatment on the surface of the When the content of the fruits and vegetables is between 20% and 60%>；
The resource recovery device comprises a biogas purification device and a biogas slurry fertilizer preparation device; the biogas purification device comprises a steam-water separation tank, a desulfurization tank and a gas holder which are connected in sequence; the biogas outlet of the anaerobic fermentation tank is connected with the inlet of the steam-water separation tank, and the biogas sequentially flows through the steam-water separation tank and the desulfurization tank and is stored in the gas holder; the biogas slurry fertilizer preparation device comprises an evaporation concentration tank, wherein a biogas slurry outlet of the anaerobic fermentation tank is connected with an inlet of the evaporation concentration tank, and the biogas slurry is subjected to the evaporation concentration tank to form an organic liquid fertilizer; volume of the gas holderSetting according to formula (5); the yield of biogas->Performing evaluation calculation by the formula (6); the yield of the organic liquid fertilizer is +.>Performing evaluation calculation by the formula (7);
（5）；
（6）；
（7）；
in the formulas (5) to (7),designing coefficients for the volume of the gas holder, < >>；/>As a factor of the efficiency of the device,；
the island organic garbage recycling system also comprises a heating device, wherein the heating device comprises a solar water heater, an electric heater and a constant-temperature hot water storage tank; the solar water heater and the electric heater are respectively connected with the constant-temperature hot water storage tank, and the water in the constant-temperature hot water storage tank is heated in a mode of adopting the solar water heater as a main part and the electric heater as a standby part; the constant-temperature hot water storage tank is connected with the anaerobic fermentation tank to regulate and control the temperature of the anaerobic fermentation tank; the solar water heater and the electric heater are also respectively connected with the evaporation concentration tank, so that the temperature of the evaporation concentration tank is regulated and controlled in a mode of adopting the solar water heater as a main part and the electric heater as a standby part;
the island organic garbage recycling method comprises the following steps:
the organic garbage classification pretreatment step specifically comprises the following steps:
filtering the domestic organic waste and the livestock-raising organic waste by utilizing a mechanical grating to obtain a fecal solid and a filtrate; outputting the filtrate into a sewage treatment system; conveying the solid waste into a crushing and sorting integrated machine for crushing to obtain slurry and uncrushed impurities; conveying the uncrushed impurities to a landfill; delivering the slurry into a blending tank;
screening the aquaculture organic waste by using a drum screen to obtain organic granular waste and screening filtrate; precipitating the screened filtrate by using a precipitation tank to obtain concentrated solution and supernatant; outputting the supernatant into a circulating water culture system; conveying the organic granular waste and the concentrated solution into a blending tank;
mixing the slurry, the organic particle waste and the concentrated solution in the mixing tank, adding water for mixing to obtain mixed solution after mixing, and enabling the solid content of the mixed solution to reach 15% -18%; conveying the blended mixed solution into an acidification sand setting tank;
acidifying and precipitating the mixed liquid after the preparation in the acidifying and precipitating tank to obtain acidified mixed liquid and residues; delivering the residue to a landfill; conveying the acidified mixed solution into an anaerobic fermentation tank;
anaerobic fermentation, namely anaerobic fermentation is carried out on the acidified mixed liquid in the anaerobic fermentation tank to obtain biogas, biogas slurry and biogas residue; conveying the biogas residues to a landfill; respectively conveying the biogas and the biogas slurry to a biogas purification device and a biogas slurry fertilizer preparation device;
the resource recovery step specifically comprises the following steps: the biogas is stored in a gas holder after sequentially undergoing dehydration treatment of a steam-water separation tank and desulfurization treatment of a desulfurization tank; the biogas slurry is concentrated by an evaporation concentration tank to obtain the organic liquid fertilizer.
2. The method for recycling the island organic garbage according to claim 1, wherein in the anaerobic fermentation step, water in a constant-temperature hot water storage tank is heated in a mode of mainly using a solar water heater and being prepared by an electric heater, so that the temperature of the anaerobic fermentation tank is regulated and controlled; in the resource recovery step, the temperature of the evaporation concentration tank is regulated and controlled in a mode that a solar water heater is used as a main part and an electric heater is used as a standby part.
3. The method for recycling island organic garbage according to claim 1, wherein in the anaerobic fermentation step, part of biogas slurry in the anaerobic fermentation tank flows back into the blending tank through the overflow pipe, and the flow regulating unit regulates and controls the amount of biogas slurry flowing back into the blending tank.
4. The method of recycling island-in-sea organic waste according to claim 1, wherein each of the impact bar groups comprises a plurality of impact bars protruding at intervals around the rotation shaft; one end of each striking rod far away from the rotating shaft is inclined towards the direction of the impurity cavity; the striking rod is a hard rubber rod.
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