CN112625874A

CN112625874A - Anaerobic digestion treatment system for kitchen waste

Info

Publication number: CN112625874A
Application number: CN202110089990.0A
Authority: CN
Inventors: 李一鸣
Original assignee: Zhejiang Normal University CJNU
Current assignee: Zhejiang Normal University CJNU
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2021-04-09
Anticipated expiration: 2041-01-22
Also published as: CN112625874B

Abstract

The invention provides an anaerobic digestion treatment system for kitchen waste, and belongs to the technical field of kitchen waste treatment. It solves the problems that the prior garbage treatment method wastes resources to a certain extent, and aerobic composting and anaerobic digestion have a plurality of defects and the like. The anaerobic fermentation device comprises an anaerobic tank, a biogas collecting port is formed in the top of the anaerobic tank, the aerobic composting device comprises an aerobic tank, a pit is formed in the top of the aerobic tank, the anaerobic tank is arranged in the pit, an adding interlayer is formed between the inner wall of the pit and the anaerobic tank, the lower part of the adding interlayer is communicated with an anaerobic digestion chamber through a delay supply mechanism, the bottom of the anaerobic digestion chamber is communicated with an aerobic composting chamber, and a biogas residue removing mechanism is arranged at the communication position. The invention has the advantages that the anaerobic digestion technology and the aerobic composting technology complement each other; the continuous feeding and two-phase process of a single anaerobic tank is realized by adopting a two-stage feeding cabin; and simultaneously treating various wastes.

Description

Anaerobic digestion treatment system for kitchen waste

Technical Field

The invention belongs to the technical field of kitchen waste treatment, and relates to an anaerobic digestion treatment system for kitchen waste.

Background

The problem of disposing urban domestic garbage is related to the sustainable development of China, and people pay more and more attention in recent years. The kitchen waste serving as an important component of the municipal solid waste has high organic content and high recycling value. Along with the expansion of cities and the improvement of the living standard of residents, a series of problems caused by kitchen waste are increasingly prominent. Meanwhile, the resource utilization and the harmless treatment of the kitchen waste have market potential, and are increasingly paid high attention by scholars at home and abroad.

At present, the kitchen waste treatment technology at home and abroad can be divided into two major non-biological treatment technologies, namely non-biological treatment and biological treatment technology according to treatment media, and the two major non-biological treatment technologies mainly refer to traditional waste treatment modes, such as incineration, landfill, mechanical crushing, feed conversion and the like; the biological treatment technology mainly comprises aerobic composting, anaerobic digestion and the like. Although the methods of animal feed treatment, incineration and landfill are the most direct treatment methods, the disadvantages are obvious, and although the methods are still the main means for garbage treatment, the treatment methods are not only wasted to a certain extent, but also are not environment-friendly. Aerobic composting and anaerobic digestion are the main development directions of various countries at present, but still have a plurality of disadvantages.

In addition, the treatment of excess sludge and garden garbage in the city is also a big factor which troubles the development of the city at present. In recent years, the municipal sewage treatment level has been remarkably improved, and the activated sludge process is a widely used treatment technique, but it generates a large amount of excess sludge, and the problem of secondary pollution due to improper disposal of the excess sludge has been revealed. The treatment and disposal of the sludge become new difficulties and challenges in the comprehensive environmental treatment work. The sludge yield is greatly increased in the coming years, but the sludge treatment level in China is low at present, the sludge is mainly discarded after conventional concentration and dehydration, the requirements of reduction, stabilization, harmlessness and reclamation of the sludge are difficult to achieve, and secondary pollution to the environment and the difficulty in normal operation of sewage treatment are brought. Therefore, how to treat the sludge in an environment-friendly manner and realize the recycling and reduction of the sludge becomes a new subject, and is a new task for realizing sustainable development. Therefore, how to realize the harmlessness, recycling and reduction of the sludge is one of the hot problems which are urgently needed to be researched at present. The garden garbage mainly refers to dead branches, fallen leaves, withered grass, flowers and rancidity, tree and shrub pruning and other plant residues and the like generated by natural withering or artificial trimming of garden plants. A large amount of garden waste generated by urban afforestation is also in urgent need to be recycled. In most cities in China, greening waste is treated by digging pits and burying or finding places to burn like common garbage at present, and the greening waste is not fixedly stored in places or in fixed treatment modes, and is generally treated by each region by a method. The landfill needs to take up an area, and incineration can aggravate haze, and abandonment also can cause fire hazard and harm the environment.

Disclosure of Invention

The invention aims to solve the problems in the existing kitchen waste treatment process and provides an anaerobic digestion treatment system for carrying out anaerobic digestion and aerobic composting by synergistic treatment of a plurality of types of waste.

The purpose of the invention can be realized by the following technical scheme:

an anaerobic digestion treatment system for kitchen waste comprises a mixing device, an anaerobic fermentation device and an aerobic composting device in sequence according to a treatment process, wherein kitchen waste is pretreated to form water-solid mixed slurry, the mixing device uniformly mixes the water-solid mixed slurry, the anaerobic fermentation device carries out anaerobic digestion on the uniformly mixed water-solid mixed slurry to generate methane, methane liquid and methane slag, the aerobic composting device is used for carrying out aerobic gas composting on the methane slag, and the anaerobic digestion treatment system is characterized in that the anaerobic fermentation device comprises an anaerobic tank, a methane collecting port is arranged at the top of the anaerobic tank, the aerobic composting device comprises an aerobic tank with an aerobic composting cavity inside, a recess is arranged at the top of the aerobic tank, the anaerobic tank is arranged in the cavity, an adding interlayer is formed between the inner wall of the cavity and the anaerobic tank, and the lower part of the adding interlayer is communicated with the anaerobic digestion cavity through a delay supply mechanism, the bottom of the anaerobic digestion cavity is communicated with the aerobic composting cavity, and a biogas residue removing mechanism is arranged at the communicated position.

The anaerobic jar is covered by the aerobic jar in structure, and heat produced by decomposed aerobic compost can continuously provide heat energy for the anaerobic jar. Meanwhile, the anaerobically digested biogas residues are stacked at the lower part of the anaerobic tank, and are guided into the aerobic composting cavity after reaching a certain volume, and then enter the aerobic composting stage, so that the anaerobic digestion biogas residues are completely realized, and meanwhile, in the whole kitchen waste recycling process, the influence of the escape of irritant gas on the surrounding environment is avoided in a closed reactor. The degradation rate and the gas production rate of the high-temperature process in the anaerobic process are far higher than those of the medium-temperature process, and the heat generated by aerobic composting can well solve the problem of energy consumption.

In foretell kitchen garbage's anaerobic digestion processing system, the interpolation intermediate layer be separated into excess sludge and add the district with anaerobic digestion, the lower part that excess sludge added the district and add the district with anaerobic digestion all is equipped with above-mentioned supply mechanism that delays and communicates with the anaerobic digestion chamber, the upper portion that excess sludge added the district is equipped with the excess sludge hatch door, the upper portion that anaerobic digestion added the district is equipped with the kitchen garbage hatch door.

The anaerobic digestion material is divided into two parts of kitchen waste and residual sludge, which enter from two doors respectively, and enter into an anaerobic digestion cavity through an atmospheric pressure delay supply mechanism by utilizing the liquid level difference principle. After each addition, the redundant part continuously stays in the residual sludge adding area and the kitchen waste adding area, so that the material can enter an anoxic state to reduce oxygen carried in anaerobic digestion, and the material can be kept at a proper temperature to reduce the hysteresis effect caused by low temperature.

The detailed reaction process of anaerobic degradation of organic matter, but the process of anaerobic degradation in general can be divided into four stages, namely a hydrolysis stage, an acidification stage, an acetoxylation stage and a methanogenesis stage. The four stages can be further simplified into a hydrolysis acidification stage and a methanogenesis stage from the viewpoint of the optimum environmental conditions of anaerobic bacteria participating in each stage. Table 1 shows the comparison of the characteristics of different anaerobes.

TABLE 1 comparison of hydrolytic acidification bacteria with methanogens

As can be seen from the table, the hydrolytic acidification bacteria are relatively many in type, are not very sensitive to pH value change, and are most suitable for the acidic environment where the hydrolytic acidification bacteria exert their activity. The methanogens are just the opposite, and the methanogens have fewer species and longer growth period and need to be domesticated for a long time. The methanogen is sensitive to pH value, so the environment is neutral, and the pH value can not be too large.

In the single-phase process, the hydrolysis acidification stage and the methanogenesis stage are carried out in the same reactor, different anaerobic bacteria cannot reach the respective optimal active environmental conditions, the time of the whole degradation process is longer, and the gas production rate is lower. And the hydrolysis acidification stage and the methane production stage in the two-phase process are carried out separately, and the independent reactor can simultaneously meet the optimum growth environmental conditions of different bacteria, thereby enhancing the stability of the anaerobic degradation process and simultaneously improving the gas production rate of the methane. Although the two-phase process has technical advantages over the single-phase process, the single-phase process is simpler to operate and control and has less investment, so that the single-phase process is still used in many engineering examples, and the two-phase process has more equipment, complex control and large investment. In the application, a constant-temperature anoxic area is formed by arranging the adding interlayer, and a two-phase process is realized by utilizing one-way process equipment.

Due to the characteristic of perishable organic matters when an anaerobic digestion process is adopted, the kitchen waste is hydrolyzed and acidified at an excessively high speed when subjected to single anaerobic digestion, so that acidification inhibition is often caused, and the effect of producing methane is influenced. The kitchen waste and the sludge cooperate with anaerobic digestion to adjust the carbon-nitrogen ratio of the substrate, balance the nutrient components of the digested substrate, stabilize the anaerobic digestion process, relieve the problems of acidification inhibition and the like, thereby improving the gas production capability. The synergistic co-digestion of the kitchen waste and the excess sludge can balance the nutrition of the substrate, is more suitable for the growth of microorganisms, and solves the problems existing in the separate fermentation, thereby improving the efficiency of producing the methane and simultaneously solving the problem of recycling treatment of the kitchen waste and the excess sludge.

In foretell anaerobic digestion processing system of kitchen garbage, marsh slag get rid of the mechanism and include material storage cylinder and scraping wings, the top of aerobic tank is equipped with a mounting panel, and it has the blanking hole with anaerobic digestion chamber intercommunication to open on the mounting panel, marsh slag get rid of the fixed setting of mechanism and corresponding with the position in blanking hole on the roof, the up end and the mounting panel of material storage cylinder link firmly, and the material storage cylinder has the through-hole that runs through from top to bottom, and the scraping wings rotates along material storage cylinder axial and sets up in the through-hole, and the bottom of scraping wings is equipped with a shrouding, and the shape of shrouding and the inner chamber shape looks adaptation of material storage cylinder down, open the discharge gate that runs through from top to bottom on the lateral wall of material storage cylinder, still be equipped with a driving motor on the mounting panel and be used for driving the scraping wings to.

In foretell kitchen garbage's anaerobic digestion processing system, the top of scraping wings is equipped with an upper sealing plate, and the shape of upper sealing plate and the inner chamber shape looks adaptation of storage cylinder, upper sealing plate and lower sealing plate set up in the both sides of scraping wings respectively relatively, and the relative scraping wings of lower sealing plate sets up perpendicularly, and the upper sealing plate level sets up, the relative upper sealing plate slope of lower sealing plate sets up.

In foretell anaerobic digestion processing system of kitchen garbage, the discharge gate department of depositing the feed cylinder is equipped with a plurality of elasticity and divides the rope, and elasticity divides the rope setting to be fixed respectively on the left and right sides wall of discharge gate at the both ends of elasticity branch rope, and a plurality of elasticity divide the rope along depositing the axial even interval setting of feed cylinder, when the shrouding rotates outside being located the discharge gate down, elasticity is divided rope evenly distributed under between shrouding and the mounting panel and with the inclination unanimity of shrouding down.

In foretell anaerobic digestion processing system of kitchen garbage, the scraping wings on be equipped with a pivot, the pivot is coaxial with above-mentioned material storage cylinder, the upper end of pivot is rotated and is set up on the mounting panel, the bottom of the material storage cylinder that locates is equipped with an installation piece, the bottom downwardly extending of pivot and rotation setting are on the installation piece.

In foretell anaerobic digestion processing system of kitchen garbage, delay feed mechanism include the baffle, the one end of this baffle and the outer wall fixed connection of anaerobic jar, the other end extends to the cavity inner wall downwards to and form between the cavity inner wall and add the crack, add the intermediate layer and communicate with the anaerobic digestion chamber through this interpolation crack, add the horizontal position that the crack is located and be less than the liquid level height of anaerobic digestion intracavity natural pond liquid.

In foretell kitchen garbage's anaerobic digestion processing system, delay feed mechanism still include movable sealing plate, movable sealing plate sets up in above-mentioned cavity and rotates and set up on the outer wall of aerobic tank, movable sealing plate's position is corresponding with the position of baffle, and the baffle is equipped with first sawtooth portion towards movable sealing plate's one end, is equipped with the second sawtooth portion that corresponds with first sawtooth portion is crisscross on the movable sealing plate, first sawtooth portion can insert and be used for plugging up above-mentioned interpolation crack in the second sawtooth portion.

In the anaerobic digestion treatment system for kitchen waste, the anaerobic tank comprises a tank body, the tank body is reversely buckled in the concave cavity, and the bottom of the concave cavity and the tank body form the anaerobic digestion cavity.

In the anaerobic digestion treatment system for kitchen waste, a first stirring blade is arranged in the tank body and connected with a first stirring motor.

In the anaerobic digestion treatment system for kitchen waste, the inner wall of the tank body is provided with a circle of overflow weir, one water outlet pipe extends into the overflow weir, and the other end of the water outlet pipe is communicated with the outside.

Under the stirring of the first stirring blades, the mixture in the anaerobic tank fully reacts, the biogas residues fall into the aerobic composting cavity through the biogas residue discharge mechanism, the biogas slurry is further precipitated through the overflow weir, and the supernatant flows out of the anaerobic digestion cavity through the water outlet pipe.

In foretell anaerobic digestion processing system of kitchen garbage, the bottom of aerobic tank be equipped with material stirring support, filter screen, second stirring vane and second agitator motor, the bottom at the aerobic tank is established to the filter screen mount, the motor shaft of second agitator motor vertical upwards and with material stirring support fixed connection, the fixed up end that sets up at material stirring support of second agitator blade, the lower part that the second agitator motor end was far away to material stirring support sets up the pulley, the pulley yoke is on the filter screen.

The pulley is arranged, on one hand, damage to the second stirring motor caused by overlong material stirring blades is reduced, and on the other hand, stirring smoothness is improved; simultaneously can be with second agitator motor together with material stirring support bed hedgehopping for form the filtration liquid collecting pit between the bottom of material stirring support and aerobic tank, filtration liquid oozes down from the hole on the filter screen, can be in the short-lived accumulation in the below of whole device, finally takes out the filtration liquid collecting pit under the effect of filtration liquid suction filtration pump.

In the anaerobic digestion treatment system for kitchen waste, an aerobic compost material adding cabin door is arranged at the top of the aerobic tank. The aerobic composting material adding cabin door is opened only when materials are added, and the cabin door is closed in the rest time, so that on one hand, the escape of internal gas is prevented from causing air pollution of the surrounding environment, and on the other hand, the reduction of the temperature in the cabin is reduced to cause energy waste.

In the anaerobic digestion treatment system for kitchen waste, the aerobic tank is internally provided with a heating and blowing system. The heating and blowing system is used for supplementing oxygen to the aerobic composting cavity.

The treatment method utilizes the marsh gas generated after the anaerobic digestion process to supply heat for the subsequent process, and the rest can be directly sold for power generation. The heat contained in the methane combustion is very large, the self-production and self-use are realized while the methane is combusted to generate electricity, the daily production expense of the garbage disposal equipment of a company is reduced, and the energy is saved. The biogas residue formed by anaerobic fermentation contains rich nutrient components and active substances, is a high-quality organic fertilizer, can be widely used in agriculture, and reduces the use of chemical fertilizers and pesticides. By composting the biogas residues, supplementing garden garbage conditioners such as straws and hay and the like, and adopting wastes such as livestock and poultry manure as nutrient substances, nutrient substances of the agricultural fertilizer are richer, and the composting effect is enhanced. After water-oil separation is carried out on the kitchen waste, the kitchen waste is jected to the working procedures of acidification, water washing, dehydration and the like, and then the kitchen waste and NaOH alcoholic solution are subjected to saponification reaction to obtain a crude product. And then carrying out acidification, decoloration, saponification and refined soap treatment to obtain the final product. The cold-making process avoids the problem of environmental pollution, simultaneously reserves nutritional organic components to the maximum extent, and has strong plasticity and small irritation.

Compared with the prior art, the invention has the following advantages:

1. the anaerobic digestion technology and the aerobic composting technology are utilized and supplement each other, methane power generated by anaerobic digestion provides initial fermentation temperature for the aerobic composting, and a heating system for generating heat after the aerobic composting is decomposed and continuously providing heat energy for an anaerobic digestion reactor in the system, so that the temperature required by two reaction units can be simultaneously completed by one-time heat supply, the energy utilization rate is improved, the energy consumption is self-sufficient, the energy requirement outside the process is greatly reduced, and the centralized large-scale treatment on the basis of low cost and low energy consumption is realized.

The invention adopts the two-stage material feeding cabin originally, the material entering the cabin body passes through a constant temperature oxygen-deficient area, the oxygen carrying is reduced to the maximum extent, and the arrangement of the constant temperature area can avoid the influence of the external temperature on the reactor all the year round. The anoxic zone is arranged without providing acid-producing environment for acid-producing bacteria, so that the inhibition effect of the hydrolytic acidification bacteria and the methanogenic bacteria is solved, and the influence of the methanogenic bacteria is avoided. The two-stage feeding cabin can realize continuous feeding and two-phase process of a single anaerobic tank, and the control is simple.

And multiple kinds of garbage are simultaneously treated, kitchen garbage, excess sludge and garden garbage can be synchronously treated, and the three principles of reduction, harmlessness and recycling are realized in the treatment process. By utilizing the kitchen waste and the excess sludge to cooperate with anaerobic digestion, the substrate nutrition can be balanced, the method is more suitable for the growth of microorganisms, and the problems existing in separate fermentation are solved, so that the methane production efficiency is improved, the resource treatment problem of the kitchen waste and the excess sludge is solved, the kitchen waste and the excess sludge are promoted together, the anaerobic digested methane residue is decomposed into fertilizer through aerobic composting, a large amount of dry substances are provided for the methane residue by introducing the garden waste, the nutrients required by the aerobic composting are provided by introducing the kitchen waste, and the simultaneous treatment of various wastes is realized.

And the problem of recycling the biogas residues is thoroughly solved.

Drawings

FIG. 1 is a schematic diagram of the general structure of the present invention;

FIG. 2 is a schematic structural view of the biogas residue removal mechanism of the present invention;

FIG. 3 is a schematic structural view showing another state of the biogas residue removing mechanism of the present invention;

FIG. 4 is a schematic diagram of the delayed feed mechanism of the present invention;

fig. 5 is a schematic configuration diagram of another state of the retard supply mechanism of the present invention.

In the figure, 1, an anaerobic tank; 2. an aerobic tank; 3. a biogas collection port; 4. a surplus sludge addition zone; 5. an anaerobic digestion addition zone; 6. a residual sludge cabin door; 7. a kitchen waste cabin door; 8. a baffle plate; 9. a first stirring blade; 10. a first stirring motor; 11. an overflow weir; 12. a water outlet pipe; 13. a material stirring bracket; 14. a second stirring blade; 15. a second stirring motor; 16. a pulley; 17. filtering with a screen; 18. a material storage barrel; 19. a material pushing plate; 20. mounting a plate; 21. a lower sealing plate; 22. an upper sealing plate; 23. an elastic dividing rope; 24. a rotating shaft; 25. mounting blocks; 26. a movable closing plate; 27. a first serration; 28. a second serration.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, the anaerobic digestion treatment system for kitchen waste according to the present invention sequentially comprises a mixing device, an anaerobic fermentation device and an aerobic composting device according to a treatment process, wherein kitchen waste is pretreated to form a water-solid mixed slurry, the mixing device mixes the water-solid mixed slurry uniformly, the anaerobic fermentation device performs anaerobic digestion on the uniformly mixed water-solid mixed slurry to generate biogas, biogas slurry and biogas residue, the aerobic composting device is used for performing aerobic gas composting on the biogas residue, the anaerobic fermentation device comprises an anaerobic tank 1, a biogas collecting port 3 is disposed at a top of the anaerobic tank 1, the aerobic composting device comprises an aerobic tank 2 having an aerobic composting cavity therein, a recess is disposed at a top of the aerobic tank 2, and the anaerobic tank 1 is disposed in the recess.

An adding interlayer is formed between the inner wall of the concave cavity and the anaerobic tank 1, the lower part of the adding interlayer is communicated with the anaerobic digestion cavity through a delay supply mechanism, the bottom of the anaerobic digestion cavity is communicated with the aerobic composting cavity, and a biogas residue removing mechanism is arranged at the communication position. The adding interlayer is divided into a residual sludge adding area 4 and an anaerobic digestion adding area 5, the lower parts of the residual sludge adding area 4 and the anaerobic digestion adding area 5 are respectively provided with the supply delaying mechanism to be communicated with the anaerobic digestion cavity, the upper part of the residual sludge adding area 4 is provided with a residual sludge cabin door 6, and the upper part of the anaerobic digestion adding area 5 is provided with a kitchen waste cabin door 7.

Delay feed mechanism and include baffle 8, the one end of this baffle 8 and the outer wall fixed connection of anaerobic jar 1, the other end extends to the cavity inner wall to one side downwards to and form between the cavity inner wall and add the crack, add the intermediate layer through this interpolation crack and anaerobic digestion chamber intercommunication, add the horizontal position that the crack was located and be less than the liquid level height of anaerobic digestion intracavity natural pond liquid.

As shown in fig. 4 and 5, the delayed supply mechanism further includes a movable sealing plate 26, the movable sealing plate 26 is disposed in the cavity and rotatably disposed on the outer wall of the aerobic tank 2, the position of the movable sealing plate 26 corresponds to the position of the baffle plate 8, a first serration part 27 is disposed on one end of the baffle plate 8 facing the movable sealing plate 26, a second serration part 28 corresponding to the first serration part 27 in a staggered manner is disposed on the movable sealing plate 26, and the first serration part 27 is insertable into the second serration part 28 for blocking the additional gap.

The materials added into the adding crack can press the movable sealing plate 26 downwards to form the state shown in fig. 5, so that the adding crack is communicated with the anaerobic digestion cavity, and the materials can enter the anaerobic digestion cavity along the adding crack; when the liquid level of the biogas slurry in the anaerobic digestion cavity is higher than that of the movable sealing plate 26, the movable sealing plate 26 can float above the biogas slurry, and the biogas slurry pushes the movable sealing plate 26 to the baffle plate 8 along with the rise of the liquid level of the biogas slurry, so that the first sawtooth part 27 of the movable sealing plate 26 is inserted into the second sawtooth part 28 of the baffle plate 8, the bottom of the adding crack is sealed, and the material in the adding crack is prevented from continuously falling into the anaerobic digestion cavity; when the liquid level of the biogas slurry is reduced, the movable sealing plate 26 swings downwards along with the liquid level, so that the adding crack is communicated with the anaerobic digestion cavity, and the feeding is continued.

The anaerobic jar 1 comprises a jar body which is reversely buckled in the concave cavity, and the bottom of the concave cavity and the jar body form the anaerobic digestion cavity. A first stirring blade 9 is arranged in the tank body, and the first stirring blade 9 is connected with a first stirring motor 10. The inner wall of the tank body is provided with a circle of overflow weir 11, a water outlet pipe 12 extends into the overflow weir 11, and the other end of the water outlet pipe is communicated with the outside.

The bottom of aerobic tank 2 is equipped with material stirring support 13, filter screen 17, second stirring vane 14 and second agitator motor 15, filter screen 17 mount is established in the bottom of aerobic tank 2, the vertical upwards and with material stirring support 13 fixed connection of motor shaft of second agitator motor 15, second stirring vane 14 is fixed to be set up at the up end of material stirring support 13, the lower part that second agitator motor 15 end was kept away from to material stirring support 13 sets up pulley 16, pulley 16 shelves are on filter screen 17. The pulley 16 is arranged, so that on one hand, the damage of the second stirring motor 15 caused by the overlong material stirring blade is reduced, and on the other hand, the stirring smoothness is improved; simultaneously can be with second agitator motor 15 together with material stirring support 13 bed hedgehopping for form the filtration liquid collecting pit between the bottom of material stirring support 13 and aerobic tank 2, filtration liquid oozes down from the hole on the filter screen 17, can be in the short accumulation in the below of whole device, finally takes out the filtration liquid collecting pit under the effect of filtration liquid suction filtration pump.

The top of the aerobic tank 2 is provided with an aerobic compost material adding cabin door. The aerobic composting material adding cabin door is opened only when materials are added, and the cabin door is closed in the rest time, so that on one hand, the escape of internal gas is prevented from causing air pollution of the surrounding environment, on the other hand, the reduction of the temperature in the cabin is reduced to cause energy waste, and a heating and blowing system is further arranged in the aerobic tank 2. The heating and blowing system is used for supplementing oxygen to the aerobic composting cavity.

As shown in fig. 2 and 3, the biogas residue removing mechanism comprises a material storage barrel 18 and a material pushing plate 19, the top of the aerobic tank 2 is provided with a mounting plate 20, the mounting plate 20 is provided with a blanking hole communicated with the anaerobic digestion chamber, the biogas residue removing mechanism is fixedly arranged on the top plate and corresponds to the blanking hole, the upper end surface of the material storage barrel 18 is fixedly connected with the mounting plate 20, the material storage barrel 18 is provided with a through hole which penetrates up and down, the material pushing plate 19 is axially and rotatably arranged in the through hole along the material storage barrel 18, the material pushing plate 19 is provided with a rotating shaft 24, the rotating shaft 24 is coaxial with the material storage barrel 18, the upper end of the rotating shaft 24 is rotatably arranged on the mounting plate 20, the bottom of the material storage barrel 18 is provided with a mounting block 25, and the bottom of the rotating shaft 24 extends downwards and is rotatably arranged on the.

The bottom of the material pushing plate 19 is provided with a lower sealing plate 21, the shape of the lower sealing plate 21 is matched with the shape of the inner cavity of the material storage barrel 18, the outer side wall of the material storage barrel 18 is provided with a material outlet which penetrates through the material storage barrel from top to bottom, and the mounting plate 20 is further provided with a driving motor which is used for driving the material pushing plate 19 to rotate and cover the material outlet. The top of the material pushing plate 19 is provided with an upper sealing plate 22, the shape of the upper sealing plate 22 is matched with the shape of the inner cavity of the material storage barrel 18, the upper sealing plate 22 and the lower sealing plate 21 are respectively and oppositely arranged on two sides of the material pushing plate 19, the lower sealing plate 21 is vertically arranged relative to the material pushing plate 19, the upper sealing plate 22 is horizontally arranged, and the lower sealing plate 21 is obliquely arranged relative to the upper sealing plate 22.

The discharge gate department of depositing the feed cylinder 18 is equipped with a plurality of elasticity and divides rope 23, and elasticity divides rope 23 sets up and fixes respectively on the left and right sides wall of discharge gate at the both ends of elasticity branch rope 23, and a plurality of elasticity divides rope 23 along depositing the even interval setting of feed cylinder 18 axial, when shrouding 21 rotates outside being located the discharge gate down, elasticity divides rope 23 evenly distributed under between shrouding 21 and mounting panel 20 and with shrouding 21's inclination unanimous down.

The working principle of the invention is as follows:

the anaerobic digestion material is divided into two parts of kitchen waste and residual sludge, which enter from two doors respectively, and enter into the anaerobic digestion cavity through a baffle 8 by atmospheric pressure by utilizing the liquid level difference principle; under the stirring of the first stirring blade 9, the mixture in the anaerobic tank 1 fully reacts, biogas slurry is further precipitated through an overflow weir 11, supernatant flows out of an anaerobic digestion cavity through a water outlet pipe 12, and biogas is discharged through a biogas collecting port 3 at the top of the anaerobic tank 1 and collected into a gas storage tank;

the biogas residues fall from the blanking hole on the mounting plate 20, as shown in fig. 2, at this time, the material pushing plate 19 covers the material outlet on the outer side wall of the material storage cylinder 18, the lower sealing plate 21 is located in the material storage cylinder 18, the material pushing plate 19 and the lower sealing plate 21 are enclosed to form a cavity which is located at the bottom of the blanking hole and used for storing biogas residues, when a certain amount of biogas residues are accumulated in the material storage cylinder 18, the driving motor drives the material pushing plate 19 to rotate, so that the lower sealing plate 21 and the material pushing plate 19 support the biogas residues to be transferred to the outside of the material storage cylinder 18, and meanwhile, the upper sealing plate 22 synchronously rotates towards the inside of the material storage cylinder 18 to seal the blanking hole;

when the material pushing plate 19 rotates outwards, the elastic dividing rope 23 is pushed by the material pushing plate 19 to deform, when the biogas residues on the lower sealing plate 21 gradually rotate outwards, the elastic dividing rope 23 can be gradually embedded into the biogas residues, when the lower sealing plate 21 completely rotates out to the outside of the material storage barrel 18, the material pushing plate 19 stops rotating, as shown in fig. 3, at the moment, the elastic dividing rope 23 can be completely embedded into the biogas residues and divides the biogas residues into a plurality of parts corresponding to the number of the elastic dividing ropes 23, so that the accumulated compact biogas residues are divided into a plurality of loose blocks, the inclined angle of the divided section is consistent with that of the lower sealing plate 21, and the biogas residues can slide into the aerobic tank 2 along the inclined plane of the lower sealing plate 21;

the driving motor drives the material pushing plate 19 to rotate reversely, so that the lower sealing plate 21 retracts into the material storage barrel 18, meanwhile, the upper sealing plate 22 synchronously rotates towards the outside of the material storage barrel 18 for opening a blanking hole, and biogas residues in the anaerobic tank 1 continuously drop downwards onto the lower sealing plate 21.

It is to be understood that in the claims, the specification of the present invention, all "including … …" are to be interpreted in an open-ended sense, i.e., in a sense equivalent to "including at least … …", and not in a closed sense, i.e., in a sense not to be interpreted as "including only … …".

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. An anaerobic digestion treatment system for kitchen waste comprises a mixing device, an anaerobic fermentation device and an aerobic composting device in sequence according to a treatment process, kitchen waste is pretreated to form water-solid mixed slurry, the mixing device uniformly mixes the water-solid mixed slurry, the anaerobic fermentation device carries out anaerobic digestion on the uniformly mixed water-solid mixed slurry to generate methane, methane liquid and methane slag, the aerobic composting device is used for carrying out aerobic gas composting on the methane slag, and the anaerobic digestion treatment system is characterized in that the anaerobic fermentation device comprises an anaerobic tank (1), a methane collection port (3) is arranged at the top of the anaerobic tank (1), the aerobic composting device comprises an aerobic tank (2) with an aerobic composting cavity inside, a depression is arranged at the top of the aerobic tank (2), the anaerobic tank (1) is arranged in the cavity, and an addition interlayer is formed between the inner wall of the cavity and the anaerobic tank (1), the lower part of the adding interlayer is communicated with the anaerobic digestion cavity through a delay supply mechanism, the bottom of the anaerobic digestion cavity is communicated with the aerobic composting cavity, and a biogas residue removing mechanism is arranged at the communication position.

2. The anaerobic digestion treatment system for kitchen waste according to claim 1, characterized in that the adding interlayer is divided into a residual sludge adding area (4) and an anaerobic digestion adding area (5), the lower parts of the residual sludge adding area (4) and the anaerobic digestion adding area (5) are respectively provided with the delay supply mechanism and communicated with the anaerobic digestion chamber, the upper part of the residual sludge adding area (4) is provided with a residual sludge cabin door (6), and the upper part of the anaerobic digestion adding area (5) is provided with a kitchen waste cabin door (7).

3. The anaerobic digestion treatment system for kitchen waste according to claim 1, characterized in that the biogas residue removing mechanism comprises a material storage barrel (18) and a material pushing plate (19), the top of the aerobic tank (2) is provided with a mounting plate (20), the mounting plate (20) is provided with a blanking hole communicated with the anaerobic digestion chamber, the biogas residue removing mechanism is fixedly arranged on the top plate and corresponds to the blanking hole, the upper end surface of the material storage barrel (18) is fixedly connected with the mounting plate (20), the material storage barrel (18) is provided with a through hole which penetrates up and down, the material pushing plate (19) is axially and rotatably arranged in the through hole along the material storage barrel (18), the bottom of the material pushing plate (19) is provided with a lower sealing plate (21), the shape of the lower sealing plate (21) is matched with the shape of the inner cavity of the material storage barrel (18), the outer side wall of the material storage barrel (18) is provided with a material outlet which penetrates up and down, and the mounting plate (20) is further provided with a driving motor for driving the material pushing plate (19) To (3).

4. The anaerobic digestion treatment system for kitchen waste, according to claim 3, characterized in that an upper sealing plate (22) is disposed on the top of the material pushing plate (19), the shape of the upper sealing plate (22) is matched with the shape of the inner cavity of the material storage barrel (18), the upper sealing plate (22) and the lower sealing plate (21) are respectively disposed on two sides of the material pushing plate (19) oppositely, the lower sealing plate (21) is disposed vertically relative to the material pushing plate (19), the upper sealing plate (22) is disposed horizontally, and the lower sealing plate (21) is disposed obliquely relative to the upper sealing plate (22).

5. The anaerobic digestion treatment system for kitchen waste according to claim 3, characterized in that the discharge port of the storage cylinder (18) is provided with a plurality of elastic dividing ropes (23), the elastic dividing ropes (23) are respectively and fixedly arranged on the left and right side walls of the discharge port at two ends of the elastic dividing ropes (23), the elastic dividing ropes (23) are axially and uniformly arranged along the storage cylinder (18), when the lower sealing plate (21) rotates to be located outside the discharge port, the elastic dividing ropes (23) are uniformly distributed between the lower sealing plate (21) and the mounting plate (20) and are consistent with the inclination angle of the lower sealing plate (21).

6. The anaerobic digestion treatment system for kitchen waste, according to claim 3, characterized in that the material pushing plate (19) is provided with a rotating shaft (24), the rotating shaft (24) is coaxial with the material storage barrel (18), the upper end of the rotating shaft (24) is rotatably arranged on the mounting plate (20), the bottom of the material storage barrel (18) is provided with a mounting block (25), and the bottom of the rotating shaft (24) extends downwards and is rotatably arranged on the mounting block (25).

7. The anaerobic digestion treatment system for kitchen waste, according to claim 1, characterized in that the supply delaying mechanism comprises a baffle (8), one end of the baffle (8) is fixedly connected with the outer wall of the anaerobic tank (1), the other end of the baffle extends downwards and slantwise towards the inner wall of the cavity, an adding crack is formed between the baffle and the inner wall of the cavity, the adding interlayer is communicated with the anaerobic digestion chamber through the adding crack, and the horizontal position of the adding crack is lower than the liquid level of biogas slurry in the anaerobic digestion chamber.

8. The anaerobic digestion treatment system for kitchen waste, according to claim 1, characterized in that said delayed feeding mechanism further comprises a movable sealing plate (26), said movable sealing plate (26) is disposed in said cavity and rotatably disposed on the outer wall of said aerobic tank (2), said movable sealing plate (26) is disposed at a position corresponding to the position of said baffle (8), one end of said baffle (8) facing said movable sealing plate (26) is provided with first serrations (27), said movable sealing plate (26) is provided with second serrations (28) corresponding to said first serrations (27) in a staggered manner, said first serrations (27) can be inserted into said second serrations (28) for blocking said additional gap.

9. The anaerobic digestion treatment system for kitchen waste, according to claim 1, characterized in that the anaerobic tank (1) comprises a tank body, the tank body is reversely buckled in the concave cavity, the bottom of the concave cavity and the tank body form the anaerobic digestion cavity, the tank body is internally provided with a first stirring blade (9), the first stirring blade (9) is connected with a first stirring motor (10), the inner wall of the tank body is provided with a ring of overflow weir (11), a water outlet pipe (12) extends into the overflow weir (11), and the other end of the water outlet pipe is communicated with the outside.

10. The anaerobic digestion treatment system for kitchen waste according to claim 1, characterized in that a material stirring support (13), a filter screen (17), a second stirring blade (14) and a second stirring motor (15) are arranged at the bottom of the aerobic tank (2), a filter screen (17) fixing frame is arranged at the bottom of the aerobic tank (2), a motor shaft of the second stirring motor (15) is vertically upward and fixedly connected with the material stirring support (13), the second stirring blade (14) is fixedly arranged at the upper end face of the material stirring support (13), a pulley (16) is arranged at the lower part of the material stirring support (13) far away from the second stirring motor (15), and the pulley (16) is arranged on the filter screen (17).