CN106631196A - Light movable vegetable waste anaerobic dry fermentation system and method for anaerobic fermentation by using light movable vegetable waste anaerobic dry fermentation system - Google Patents

Abstract

The invention relates to a light-duty movable vegetable waste anaerobic dry fermentation system and an anaerobic fermentation method using the system. The oxygen dry fermentation device includes a plurality of anaerobic reaction units connected side by side, and a solar panel insulation room is arranged on the outer cover of the anaerobic reaction unit. The anaerobic reaction unit includes a reaction tank and a gas storage membrane, and the adjacent gas storage membrane and fermentation The tanks are connected by connecting chains. The device of the present invention is simple and movable, and anaerobically ferments the planting and processing vegetable waste produced by intensive vegetable areas or scattered vegetable growers to produce biogas, obtain organic fertilizers, realize energy utilization of organic wastes in vegetable areas, and improve vegetable production efficiency. Improve the environment of the area, improve the quality of vegetables, and improve the quality of the land in the vegetable area.

Description

A light-duty mobile vegetable waste anaerobic dry fermentation system and its utilization Anaerobic fermentation method

technical field

The invention relates to a vegetable waste treatment device in an intensive vegetable area, in particular to a light-duty movable vegetable waste anaerobic dry fermentation system and an anaerobic fermentation method using the system, belonging to the technical field of waste resource utilization.

Background technique

Since the implementation of the "Vegetable Basket" project in 1988, the output of vegetables in our country has continued to increase, the varieties have become more abundant, and the quality of life of the people has improved significantly. As a large vegetable country in the world, my country has a vegetable planting area of more than 300 million mu and an annual output of more than 700 million tons, ranking first in the world in terms of vegetable planting area and total vegetable output.

In the process of vegetable production and processing, roots, stems, leaves, rotten fruits and tail vegetables without commercial value will be produced, which are called vegetable waste. Vegetable wastes are produced in a large amount in my country. According to statistics, 100 million to 150 million tons of vegetable wastes are produced every year, and these vegetable wastes account for 20-50% of China's urban domestic waste. Vegetable waste has a high content of moisture and organic matter. If it is piled up randomly, it will cause serious pollution to the surrounding environment. Moreover, after the vegetable waste dumped and piled up in the fields rots and deteriorates, it is easy to cause air, river, and groundwater environmental pollution, thereby affecting the sustainable development of vegetable production.

The biomass types of vegetable waste are mainly total sugar, protein, fat, hemicellulose, cellulose and lignin, which is a good raw material for biological fermentation. The main utilization methods of vegetable waste are anaerobic fermentation and aerobic composting. In recent years, domestic and foreign scholars have conducted some research on vegetable waste composting, but compared with composting, anaerobic digestion process has more advantages. Its most important advantage is that it can generate biogas, which can be used for power generation and heating, reduce CO ₂ emissions, or be used for vegetable greenhouse heating and CO2 gas fertilizer. The digested product can be used as high-quality fertilizer after simple treatment.

In recent years, the difficult utilization of biogas slurry has become a bottleneck restricting the development of biogas projects. Dry fermentation is touted as a solution to this problem. The so-called anaerobic dry fermentation, also known as solid anaerobic fermentation, has the same reaction essence as anaerobic wet fermentation. The organic matter is decomposed and fermented by microbial anaerobic bacteria into three stages: liquefaction, acidification, and methane production; ① In the liquefaction stage, the anaerobic Aerobic bacteria use enzymes to enzymatically hydrolyze organic matter, turning solid matter into water-soluble substances; ② in the acid-producing stage, rely on acid-producing bacteria to convert the above-mentioned soluble matter into acidic intermediates; ③ in the methanogenic stage, finally The acidic intermediates and other carbohydrates in the material are converted into biogas by methanogenic bacteria.

The anaerobic dry fermentation treatment process is a breakthrough in the traditional wet fermentation anaerobic treatment process. This process subverts the traditional anaerobic treatment process in which the raw material and water must be completely mixed, but increases the dry matter concentration of the raw material to more than 20%. Take some effective measures to complete the anaerobic process. This process is consistent with the traditional fermentation anaerobic treatment technology in terms of microenvironment, and can achieve the maximum gas production potential of organic matter. The new process can effectively save heating energy due to the use of higher dry matter concentration. Moreover, biogas slurry is not produced, and secondary pollution will not be caused. This process is especially suitable for treating solid waste with high solid content, such as agricultural waste such as rural straw and livestock manure, urban and rural domestic waste, etc.

Chinese patent document CN102344232A discloses a method for producing biogas and organic fertilizer by dry fermentation of livestock and poultry manure. In this method, solid livestock and poultry manure with a dry matter concentration greater than 15% is directly entered into a biogas fermentation device, or mixed with livestock and poultry manure fermentation residues After entering the biogas fermentation device to produce biogas, the fermentation residue is used as organic fertilizer or composted to produce organic fertilizer. Chinese patent document CN101734961A discloses a method for treating vegetable straw waste. Through research on the composition and properties of vegetable straw waste, a harmless treatment method is provided for concentrated stacking of vegetable straw waste and inoculation of compound microbial fermentation. , the process is relatively simple, but the processing time is long, the efficiency is slow, the harmful gas produced by stacking and fermentation pollutes the environment, and it cannot generate new energy biogas, and the effective resource recycling of waste has not been realized. Chinese patent document CN102242057A discloses a spiral cylinder dry fermentation device. The method is a spiral barrel dry fermentation device capable of realizing continuous feeding and discharging, uniform mass transfer and stable gas production. Chinese patent document CN 105316220 A discloses an external stirring garage-type anaerobic dry fermentation device, which adopts a garage-type structure to facilitate feeding and discharging materials. The leachate flows in the fermented solids, which solves the problem of uneven mass and heat transfer and easy acidification of materials, and at the same time shows the advantages of simple structure, low cost and low energy consumption.

It can be seen that domestic scholars have done a lot of research on dry fermentation devices and methods for farm manure, straw and other wastes. At present, there are no relevant public reports on anaerobic dry fermentation devices for vegetable waste.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides a light-duty movable vegetable waste anaerobic dry fermentation system, which can be designed according to the amount of vegetable waste, and can be planted in intensive vegetable areas or scattered vegetable growers. , Anaerobic fermentation treatment of processed vegetable waste to obtain biogas and organic fertilizers, realize the resource utilization of organic waste in vegetable areas, improve the environment of vegetable areas, improve the quality of vegetables, and improve the quality of land in vegetable areas.

Glossary

Vegetable waste: Refers to vegetable leaves, roots, stems, fruits and a large amount of defective vegetable waste generated during vegetable planting or processing. The solid content is 12-25wt% in terms of mass percentage.

Dry corn stalks: the solid content is 80-90 wt% in terms of mass percentage.

Inoculum: Refers to the material rich in anaerobic bacteria added to the biogas digester in order to speed up the start-up speed of the anaerobic fermentation device and improve the fermentation efficiency. Biogas residues from well-fermented biogas digesters can be selected.

The solid content TS refers to the percentage of dry matter in the waste to the total waste.

Technical scheme of the present invention is as follows:

A light-duty mobile anaerobic dry fermentation system for vegetable waste, comprising sequentially connected pulverizers, blending tanks, conveyor belts and anaerobic dry fermentation devices, the anaerobic dry fermentation devices include multiple anaerobic dry fermentation devices connected side by side Oxygen reaction monomers are equipped with a sun board heat preservation room on the outer cover of the anaerobic reaction monomers connected side by side. Each anaerobic reaction monomer includes a reaction tank and a gas storage membrane. The gas storage membrane is open at one end and closed at the other end. A storage device with a gas storage cavity, the open end of the gas storage film is tightly connected to the upper edge of the reaction tank and the cavity of the reaction tank communicates with the gas storage cavity of the gas storage film, and the adjacent gas storage film and the adjacent reaction tank They are connected by connecting chains, and a slag discharge port is provided at the bottom of each reaction tank, and the slag discharge port is sealed with a sealing cover.

Preferably in the present invention, connecting rings are provided on the upper and lower sides of the gas storage membrane, the connecting rings on adjacent gas storage membranes are connected to form a connecting chain, and a suspension ring is provided at the position where the solar panel heat preservation room is opposite to the gas storage membrane , the hanging ring is connected with a hook, and the air storage membrane is connected and fixed with the top of the sunshine board heat preservation room through the hook.

Preferably in the present invention, connecting rings are provided on the upper and lower sides of the fermenter, and the connecting rings on adjacent fermenters are connected to form a connecting chain.

Preferably in the present invention, the thickness of the side wall of the gas storage membrane is 1-2 mm, each gas storage membrane is connected with an air guide tube, and the opening end of the gas storage membrane is trumpet-shaped. The trumpet-shaped opening is conveniently connected with the upper part of the reaction tank and has good sealing performance.

Preferably in the present invention, the anaerobic dry fermentation device also includes a slide track, the slide track is covered in the sun panel heat preservation room, and is laid horizontally on the bottom of the sun panel heat preservation room, a track groove is arranged on the slide track, and the bottom of the reaction tank is provided with The pulley is embedded in the track groove and can slide in the track groove, and the reaction tank is cylindrical.

Preferably in the present invention, the bottom of the anaerobic dry fermentation device is provided with a support frame, and a biogas residue composting device is arranged inside the support frame. The slag outlet of the reaction tank of the device is opposite, and is used to receive the materials discharged from the reaction tank.

After the vegetable waste is harvested, it is pulverized by a shredder, blended in the blending tank, and then transported to the anaerobic fermentation device through the conveyor belt. After fermentation in the anaerobic fermentation device, it enters the biogas residue composting device for post-composting treatment.

Preferably in the present invention, the material of the reaction tank is PE material, the volume of each reaction tank is 200-400L, and the number of anaerobic reaction monomers is 3-6.

Preferably, the reaction tank can also be improved by using an existing plastic trash can, which is convenient for feeding and discharging materials and moving. In practical application, the number of anaerobic reaction monomers is set according to the amount of vegetable waste, and the reaction tank monomers are connected sequentially through connecting rings.

Preferably in the present invention, the solar panel heat preservation room is in the shape of a cuboid, and the top wall and side wall are transparent thermal insulation solar panels with a thickness of 1-2 cm.

Preferably in the present invention, the front and rear sides of the sunshine board heat preservation room are provided with open and close doors.

Preferably in the present invention, the output port of the pulverizer is connected with the blending pool, the bottom of the blending pool is provided with a discharge port, the discharge port of the blending pool is connected with the feed port of the conveyor belt, and the discharge port of the conveyor belt is connected with the anaerobic dryer. The fermentation device is connected, and guardrails are set on both sides of the conveyor belt to prevent materials from spilling.

Preferably in the present invention, a buckle is provided at one end of the conveyor belt, which can be tightly connected to the top edge of the reaction tank.

The material of the integrated gas storage membrane is a special corrosion-resistant composite material for environmental protection, which is sold by Chengdu Wanbo Environmental Protection Technology Co., Ltd.

The pulverizer is a food waste disposer, which is available in the market.

The vegetable waste allocation pool and the biogas residue composting pool can be designed according to the usual techniques in the field, preferably with an upper brick-concrete structure.

The size of the above-mentioned portable vegetable waste anaerobic dry fermentation system is designed according to the amount of vegetable waste produced, and those skilled in the art can implement this design based on common sense.

The method for carrying out dry fermentation using the above-mentioned light-duty movable vegetable waste anaerobic dry fermentation system includes the following steps:

(1) Collect vegetable waste and grind it to 1-2cm through a pulverizer;

(2) Material adjustment: After being pulverized by a pulverizer, enter the blending pool for blending. If the solid content TS of vegetable waste is 12-20%, add corn stalks to the vegetable waste to adjust the solid content TS to 20-25% %, to obtain a mixed material; if the solid content TS of the vegetable waste is 20-25%, it can be directly fermented with a single material;

(3) Add the inoculum to the mixed material or single material of step (2), adjust the pH value to 7.5-8.0 to obtain the fermented material, and transport the fermented material to the reaction tank by the conveyor belt, after one reaction tank is fed , move under the gas storage membrane through the sliding track, seal the gas storage membrane and the reaction tank, the feeding and sealing of other reaction tanks are the same as above, close the switch door of the solar panel heat preservation room, and carry out anaerobic reaction at a temperature of 33-39°C. fermentation.

Preferably in the present invention, the inoculum is the biogas residue in the biogas digester with normal gas production, the solid content TS of the biogas residue is 20-25% by mass percentage, the volatile solid (VS) of the inoculum and the mixed material The volatile solids (VS) are the same.

The biogas produced by the method of the invention is dehydrated and desulfurized and used for cooking by farmers and lighting in solar greenhouses; the generated biogas residue is used as base fertilizer for vegetable greenhouses.

Preferably in the present invention, in step (2), add straw to the crushed vegetable waste, stir evenly, and the mass ratio of the amount of straw added to the crushed vegetable waste is: (1-2): (7-20) .

Preferably according to the present invention, the temperature of anaerobic dry fermentation in step (3) is 35-37°C, more preferably, the temperature of anaerobic dry fermentation is 36°C.

Most of the solar greenhouses are self-operated, and the planting mode is relatively scattered. Each planting subject has more than 10 greenhouses, and as few as 1-2 greenhouses. The amount of vegetable waste generated varies, and it is difficult to collect it in a centralized manner. The light-duty movable vegetable waste anaerobic dry fermentation system of the present invention and the anaerobic fermentation method using the system can set the number of anaerobic dry fermentation devices according to the number of greenhouses and the amount of vegetable waste produced, and can be moved to facilitate vegetable planting. It is more convenient for users to use. In addition, it is more convenient to use biogas to supplement CO ₂ gas fertilizer for lighting in vegetable greenhouses.

The present invention has the following advantages:

1. The method of anaerobic fermentation of vegetable waste of the present invention is dry fermentation, the fermentation concentration is high, acidification will not cause system collapse, and biogas slurry will not be generated to cause secondary pollution;

2. The movable anaerobic fermentation device of the present invention is designed according to the characteristics of the vegetable planting area, and can be moved freely according to the demand, and is easy to use;

3. The anaerobic fermentation device of the present invention is a plurality of reaction tanks connected in sequence, and the number of fermentation devices can be controlled according to the amount of vegetable waste produced, which is simple and practical.

4. The present invention is a method and device for anaerobic dry fermentation, which has high treatment efficiency and a small footprint, and the biogas residue produced after fermentation is directly used as vegetable fertilizer.

5. The vegetable waste treatment method of the present invention is easy to operate, easy to use and maintain, and strong in practicability, and can be popularized and applied on a large scale in intensive vegetable areas.

Description of drawings

Fig. 1 is the structure schematic diagram of light-duty movable vegetable waste anaerobic dry fermentation system of the present invention;

Fig. 2 is the partial structural representation of anaerobic dry fermentation device;

Fig. 3 is a material conveyor belt and a schematic diagram of connection;

Figure 4 is a schematic diagram of the sliding track,

Fig. 5 is a graph showing the change of pH value of the fermented liquid during the anaerobic fermentation process.

Among them: 1. Crusher, 2. Blending tank, 3. Anaerobic dry fermentation device, 4. Biogas residue composting tank, 5. Feed pump, 6. Conveyor belt, 7. Support frame, 8. Blower, 9. Anaerobic Oxygen reactive monomer, 10, connecting ring, 11, gas storage membrane, 12, connecting chain, 13, sliding track, 14, sunshine board insulation room, 15, sliding track, 16, buckle, 17, guardrail, 18, track Groove, 19, suspension ring, 20, reaction tank.

detailed description

The present invention is described in detail below through examples. The examples are used to further illustrate the present invention so that those skilled in the art can further understand the present invention, and should not be construed as limiting the protection scope of the present invention. Everything that is not described in detail in the embodiments is according to the prior art in this field.

The biogas residue is obtained from the biogas digester that has been in normal continuous operation for more than one month, and it comes from the biogas project of Jixiang Animal Husbandry Farmers Professional Cooperative in Shizhong District, Jinan City.

The characteristics of vegetable waste, cow dung and corn stalks in the examples are shown in Table 1.

Table 1 Characteristics of vegetable waste and inoculum

Example 1

A light-duty mobile vegetable waste anaerobic dry fermentation system, as shown in Figures 1-4, includes a pulverizer 1 connected in sequence, a blending tank 2, a conveyor belt 6 and an anaerobic dry fermentation device 3, anaerobic The dry fermentation device 3 includes a plurality of anaerobic reaction monomers 9 connected side by side, the output port of the pulverizer 1 is connected to the blending pool 2, the bottom of the blending pool 2 is provided with a discharge port, and the discharge port of the blending pool 2 is connected to the conveyor belt The feed port of 6 is connected, and the discharge port of conveyor belt 6 is connected with anaerobic dry fermentation device 3, and guardrails are set on both sides of conveyor belt 6 to prevent materials from spilling.

The outer cover of the anaerobic reaction monomers 9 connected side by side is provided with a sun board insulation room 14, and each anaerobic reaction monomer 9 includes a reaction tank 20 and a gas storage membrane 11, and the gas storage membrane 11 is an open end, and the other end is closed. The storage device that is provided with gas storage cavity, the open end of gas storage film 11 is closely connected on the upper edge of reaction tank 20 and the cavity of reaction tank communicates with the gas storage cavity of gas storage film, the side wall of gas storage film 11 The thickness is 2mm, and each gas storage membrane is connected with an air guide tube, and the opening end of the gas storage membrane is trumpet-shaped. The trumpet-shaped opening is conveniently connected with the upper part of the reaction tank and has good sealing performance.

The upper and lower sides of the gas storage membrane 11 are provided with connecting rings, and the connecting rings on the adjacent gas storage membranes are connected to form a connecting chain 12. The upper and lower sides of the fermenter are provided with connecting rings, and the adjacent fermentation tanks are provided with connecting rings. The connecting rings on the cans connect to form a connecting chain. The position relative to the air-storage film on the sunshine board insulation room 14 is provided with a suspension ring 19, and the suspension ring 19 is connected with a suspension hook, and the air storage membrane 11 is connected and fixed with the sunlight-slab insulation room 14 top by the suspension hook.

The anaerobic dry fermentation device also includes a sliding track 13, the sliding track 13 is covered in the sun board heat preservation room 14, and is horizontally laid on the bottom of the sun board heat preservation room 14, and the sliding track 13 is provided with a track groove 18, and the bottom of the reaction tank 20 A pulley is provided, the pulley is embedded in the track groove and can slide in the track groove 18, and the reaction tank is cylindrical. The material of the reaction tank is PE, and the number of anaerobic reaction monomers is 4. The bottom of the anaerobic dry fermentation device is provided with a support frame 7, and a biogas residue composting device is arranged inside the support frame 7. The biogas residue composting device includes a compost tank 4 and a blower 8, and the compost tank 4 of the biogas residue composting device and the anaerobic dry fermentation The slag outlet of the reaction tank of the device is opposite, and is used to receive the materials discharged from the reaction tank.

Sunshine board heat preservation room 14 is cuboid shape, and top wall and side wall are the transparent heat preservation sunshine board of thickness 2cm. There are switch doors on the front and rear sides of the sunshine board insulation room. One end of the conveyor belt is provided with buckles, which can be tightly connected with the top edge of the reaction tank.

Example 2

With a kind of light-duty movable vegetable waste anaerobic dry fermentation system described in embodiment 1, the difference is:

The number of anaerobic reaction monomers is 3.

Example 3

With a kind of light-duty movable vegetable waste anaerobic dry fermentation system described in embodiment 1, the difference is:

The number of anaerobic reaction monomers is 2.

Example 4: 3 solar greenhouses, covering an area of 2000m ² , and the root vegetable waste produced by single fermentation

The characteristics of root vegetable waste and inoculum are shown in Table 1.

The method for carrying out dry fermentation using the light-duty mobile vegetable waste anaerobic dry fermentation system of Example 1 comprises the following steps: the designed volume of the vegetable waste blending pool is 800L, and the size is designed to be 0.5m×0.4m×0.4m; The designed volume of the anaerobic dry fermentation device is 300L, the size is r=0.31m, h=1m; the designed volume of the biogas residue composting device is 1000L, and the size is 1.0m×1.0m×1.0m.

(1) The collected vegetable waste is crushed to 1.5cm;

(2) Get 130kg of crushed vegetable waste, add 130kg of inoculum, and add a small amount of water to stir evenly, the solids TS is 23%, to obtain a mixed material; The solid content TS of the slag is 20-25% by mass percentage,

(3) The fermented material is transported into the reaction tank through the conveyor belt to obtain the fermented material. After feeding one reaction tank, it is moved under the gas storage membrane through the sliding track, and the gas storage membrane and the reaction tank are sealed. The feeding and sealing are the same as above, close the switch door of the solar panel heat preservation room, and perform anaerobic fermentation at a temperature of 36°C; the material retention period is 30 days, and the generated biogas is used for lighting in the solar greenhouse to increase carbon dioxide gas fertilizer.

The biogas production conditions are shown in Table 2. The single vegetable waste dry fermentation using the method and device is compared with the wet fermentation using the device of the present invention, the fermentation time is 40 days, the cumulative gas production of dry fermentation (fermentation concentration 23.0%) unit VS biogas reaches 424.64mL/g, and the specific humidity fermentation Increased by 26.4%, methane content in biogas reached 58.9%, while wet fermentation was 53.4%.

The pH value of the fermentation broth during anaerobic fermentation is shown in Figure 5. The pH value of dry fermentation of single vegetable waste was maintained at 7.1-8.3, and the system was relatively stable, while the pH value of wet fermentation changed greatly. The pH value began to be lower than 5 after 18 days of fermentation, and it has been on a downward trend, reaching a minimum of 4.22. acidification.

Table 2 Biogas production

Example 5: 3 solar greenhouses, covering an area of 2000m ² , the root vegetable waste produced is mixed with cow dung for fermentation

The properties of root vegetable waste, cow manure and inoculum are shown in Table 1.

The method for carrying out dry fermentation using the light-duty mobile vegetable waste anaerobic dry fermentation system of Example 1 comprises the following steps: the designed volume of the vegetable waste blending pool is 800L, and the size is designed to be 0.5m×0.4m×0.4m; The designed volume of the anaerobic dry fermentation device is 300L, the size is r=0.31m, h=1m; the designed volume of the biogas residue composting device is 1000L, and the size is 1.0m×1.0m×1.0m.

(1) The collected vegetable waste is pulverized to 1.5cm and set aside;

(2) Get 104kg of vegetable waste after pulverization, 26kg of cow dung, add the inoculum of 130kg, and add a small amount of water and stir evenly, the solid matter TS is 23%, obtains mixed material; Biogas residue, the solid content TS of biogas residue is 20-25% by mass percentage,

(3) The fermented material is transported into the reaction tank through the conveyor belt to obtain the fermented material. After feeding one reaction tank, it is moved under the gas storage membrane through the sliding track, and the gas storage membrane and the reaction tank are sealed. The feeding and sealing are the same as above, close the switch door of the solar panel heat preservation room, and perform anaerobic fermentation at a temperature of 36°C; the material retention period is 30 days, and the generated biogas is used for lighting in the solar greenhouse to increase carbon dioxide gas fertilizer.

The biogas production conditions are shown in Table 3. Using the method and device, the vegetable waste and cow dung are dry-fermented according to the ratio of 4:1, the fermentation time is 40 days, and the cumulative gas production per unit VS biogas reaches 412.67mL/g, which is 11.5% higher than the ratio of 1:1. . The methane content in biogas is above 57%, with little difference.

Table 3 Biogas production

Example 6: 3 solar greenhouses, covering an area of 2000m ² , mixed fermentation of leaf and fruit vegetable waste and straw

The characteristics of leaf and fruit vegetable waste, straw and inoculum are shown in Table 1.

The method for carrying out dry fermentation using the light-duty mobile vegetable waste anaerobic dry fermentation system of Example 1 comprises the following steps: the designed volume of the vegetable waste blending pool is 800L, and the size is designed to be 0.5m×0.4m×0.4m; The designed volume of the anaerobic dry fermentation device is 300L, the size is r=0.31m, h=1m; the designed volume of the biogas residue composting device is 1000L, and the size is 1.0m×1.0m×1.0m.

(1) The collected vegetable waste is pulverized to 1.5cm and set aside;

(2) The collected corn stalks are pulverized to about 1 cm and set aside;

(3) Get 104kg of vegetable waste after pulverization, 26kg of cow dung, add the inoculum of 130kg, and add a small amount of water and stir evenly, the solid matter TS is 23%, obtains mixed material; Biogas residue, the solid content TS of biogas residue is 20-25% by mass percentage,

(3) The fermented material is transported into the reaction tank through the conveyor belt to obtain the fermented material. After feeding one reaction tank, it is moved under the gas storage membrane through the sliding track, and the gas storage membrane and the reaction tank are sealed. The feeding and sealing are the same as above, close the switch door of the solar panel heat preservation room, and perform anaerobic fermentation at a temperature of 36°C; the material retention period is 30 days, and the generated biogas is used for lighting in the solar greenhouse to increase carbon dioxide gas fertilizer.

The biogas production conditions are shown in Table 4. Using the method and device, the vegetable waste and corn stalks are dry-fermented according to the ratio of 4:1, the fermentation time is 40 days, the cumulative gas production per unit VS biogas is 220.6mL/g, and the ratio of 1:1 is increased by 10.2% . The methane content in the biogas is above 56%, with little difference.

Table 4 Biogas production

Claims (10)

1. a kind of light-duty packaged type vegetable castoff anaerobic dry fermentation system, including the pulverizer, preparing pool being sequentially connected with, defeated Band and anaerobic dry fermentation apparatus are sent, described anaerobic dry fermentation apparatus include multiple anaerobic reaction monomers for connecting side by side, simultaneously Sunlight board insulated building is covered with outside the anaerobic reaction monomer of row's connection, each anaerobic reaction monomer includes retort and gas storage film, Gas storage film is one end open, and other end closing, inside is provided with the storage device of gas storage cavity, and the openend of gas storage film closely connects In the top edge of retort and the cavity of retort is connected with the gas storage cavity of gas storage film, adjacent gas storage film and adjacent anti- Answer and connected by connects chain between tank, the bottom of each retort is provided with slag-drip opening, slag-drip opening seal cap sealing.

2. light-duty packaged type vegetable castoff anaerobic dry fermentation system according to claim 1, it is characterised in that in storage The side upper and lower of air film is provided with connection ring, and the connection ring on adjacent gas storage film connects to form connects chain, in sunlight The plate insulated building position relative with gas storage film is provided with suspension ring, and suspension ring are connected with suspension hook, and gas storage film is protected by suspension hook with sunlight board Hot house top is connected；Connection ring, the connection ring on adjacent fermentation tank are provided with the side upper and lower of fermentation tank Connection forms connects chain.

3. light-duty packaged type vegetable castoff anaerobic dry fermentation system according to claim 1, it is characterised in that described The thickness of gas storage film side wall be 1-2mm, each gas storage film is respectively connected with wireway, and the openend of gas storage film is in horn-like.

4. light-duty packaged type vegetable castoff anaerobic dry fermentation system according to claim 1, it is characterised in that anaerobism Dry fermentation device also includes dragging track, and dragging track is located in sunlight board insulated building, is laterally laid on sunlight board insulation Room bottom, is provided with rail groove on dragging track, and the bottom of retort is provided with pulley, and pulley is embedded in rail groove and can be in-orbit Slide in road groove, described retort is cylinder.

5. light-duty packaged type vegetable castoff anaerobic dry fermentation system according to claim 1, it is characterised in that anaerobism The bottom of dry fermentation device is provided with bracing frame, and in bracing frame biogas residue composting device is internally provided with, and biogas residue composting device includes Compost and air blast, the compost of biogas residue composting device is relative with the slag-drip opening of the retort of anaerobic dry fermentation apparatus, is used for The material that access retort is discharged.

6. light-duty packaged type vegetable castoff anaerobic dry fermentation system according to claim 1, it is characterised in that described Retort material be PE, each retort unit volume is 200-400L, and anaerobic reaction monomer number is 3-6；Described Sunlight board insulated building is cuboid, roof and the transparent heat-insulation sunlight board that side wall is thickness 1-2cm；Before and after sunlight board insulated building Both sides are provided with switch gate.

7. light-duty packaged type vegetable castoff anaerobic dry fermentation system according to claim 1, it is characterised in that crush The delivery outlet of machine is connected with preparing pool, and the bottom of preparing pool is provided with discharging opening, the discharging opening of preparing pool and the charging of conveyer belt Mouth connection, the discharging opening of conveyer belt is connected with anaerobic dry fermentation apparatus, and in two sides of conveyer belt guardrail is arranged, and prevents material from spilling Fall；Conveyer belt one end arranges buckle.

8. the side of dry fermentation is carried out using the light-duty packaged type vegetable castoff anaerobic dry fermentation system described in claim 1 Method, including step is as follows：

(1) collect the size-reduced machine of vegetable castoff and be crushed to 1～2cm；

(2) material is adjusted：Size-reduced machine is entered in preparing pool after crushing and allocated, if solid content TS of vegetable castoff is 12-20%, maize straw is added in vegetable castoff, and regulation solid content TS is 20-25%, obtains mixed material；If vegetable Solid content TS of dish discarded object is 20-25%, then can use single material direct fermentation；

(3) inoculum is added in the mixed material or single material of step (2), it is 7.5～8.0 to adjust pH value, obtains fermentate Fermentation materials are passed through tape transport in retort by material, after a retort charging is finished, by sliding rail storage are moved to Under air film, gas storage film and retort are sealed, charging, the sealing of other retort ibid close the switch of sunlight board insulated building Door, under the conditions of 33～39 DEG C of temperature anaerobic fermentation is carried out.

9. dry fermentation method according to claim 8, it is characterised in that described inoculum is in normal gas producing methane-generating pit Biogas residue, solid content TS of biogas residue is by percentage to the quality 20～25%, the volatile solid (VS) of inoculum with it is mixed The volatile solid (VS) of compound material is identical.

10. dry fermentation method according to claim 8, it is characterised in that to the vegetable castoff after crushing in step (2) Middle addition stalk, stirs, the addition of stalk with crush after the mass ratio of vegetable castoff be：(1～2)：(7～20)； The temperature of anaerobic dry fermentation is 35～37 DEG C in step (3), is more highly preferred to, and the temperature of anaerobic dry fermentation is 36 DEG C.