CN112063501A - Crop straw and pig raising wastewater mixed anaerobic fermentation device and fermentation method - Google Patents
Crop straw and pig raising wastewater mixed anaerobic fermentation device and fermentation method Download PDFInfo
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- 238000000855 fermentation Methods 0.000 title claims abstract description 156
- 230000004151 fermentation Effects 0.000 title claims abstract description 120
- 239000010902 straw Substances 0.000 title claims abstract description 70
- 239000002351 wastewater Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims description 22
- 239000000463 material Substances 0.000 claims abstract description 67
- 238000003756 stirring Methods 0.000 claims abstract description 54
- 241000282898 Sus scrofa Species 0.000 claims description 30
- 238000010438 heat treatment Methods 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 7
- 238000009264 composting Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 4
- 241000282887 Suidae Species 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 5
- 244000144972 livestock Species 0.000 description 4
- 244000005700 microbiome Species 0.000 description 4
- 240000007594 Oryza sativa Species 0.000 description 3
- 235000007164 Oryza sativa Nutrition 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- 238000004519 manufacturing process Methods 0.000 description 3
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- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 244000007853 Sarothamnus scoparius Species 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 238000010564 aerobic fermentation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention discloses a crop straw and pig raising wastewater mixed anaerobic fermentation device, a crushing device comprises: the straw crushing box is characterized by comprising a crushing box, a straw inlet and a crushed material outlet are respectively formed in the top and the bottom of the crushing box, a plurality of round rods are arranged in the crushing box, and two ends of each round rod are respectively fixed with two inner walls of the crushing box; the rotating wheels and the first motors are mounted on the round rods, the output ends of the first motors are fixedly connected with the rotating wheels, and cutter teeth are distributed on the peripheries of the rotating wheels; the fermentation device comprises: the top of the fermentation box is provided with a crushed material inlet and a waste water inlet side by side, and the crushed material inlet is communicated with the crushed material outlet; a fermented material outlet is formed in the position, close to the bottom, of the side wall of the fermentation box; a second motor is fixed on the outer wall of the fermentation box, and a stirring shaft, stirring blades and a stirring turbine are arranged in the fermentation box; the stirring leaf is installed on the (mixing) shaft, and the stirring turbine cup joints on the (mixing) shaft, and (mixing) shaft one end is rotated with the fermentation box inner wall and is connected, and the other end runs through the fermentation box and with motor two's output fixed connection.
Description
Technical Field
The invention relates to the technical field of anaerobic fermentation, in particular to a device and a method for mixing crop straws with pig raising wastewater for anaerobic fermentation.
Background
The crop straw refers to the stem and leaf part of the rice, wheat, corn and other gramineous crops after mature threshing. Before industrialization, farmers use the straws in the eight-door way, and the straw is very abundant. For example, in southern China, people dry and store rice straws, and the rice straws can be used as household articles such as firewood, woven seat cushions, mattresses, brooms and the like, used for bedding livestock rings, used for feeding livestock, and used for composting and returning the fertilizer to the field, even used for manufacturing roofs of simple houses and the like, and are rarely wasted directly. In China for over two decades, due to popularization of coal, electricity and natural gas and abundance of various industrial products, the demand of rural areas on straws is reduced, the treatment of a large amount of straws becomes a serious social problem, and although laws are forbidden, many local farmers still directly burn the straws in the fields, so that the consequences of air pollution, fire disasters, incapability of normally lifting and descending airplanes and the like are caused.
With the development of animal husbandry, the discharge amount of livestock wastewater is increasing day by day. Because the pig raising wastewater contains a large amount of organic matters and solid and liquid are mixed, the influence on the agricultural ecological environment and the water environment is increasingly aggravated, if the crop straws and the pig raising wastewater can be subjected to mixed anaerobic fermentation treatment, the comprehensive utilization of the crop straws and the pig raising wastewater can be realized, the pollution to the environment is reduced, and the utilization efficiency of resources is improved.
Therefore, the technical personnel in the field need to solve the problem how to provide a crop straw and pig raising wastewater mixed anaerobic fermentation device and a fermentation method.
Disclosure of Invention
In view of the above, the invention provides a mixed anaerobic fermentation device and method, the device integrates crushing and fermentation into a whole, realizes crushing and fermentation of straws, and has simple structure and convenient operation; in the fermentation process, the fermentation temperature, humidity and pH value are reasonably controlled, and the utilization rate of resources is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a crop straw and waste water mixed anaerobic fermentation device of raising pigs, includes: reducing mechanism and fermenting installation, the reducing mechanism includes: the straw crushing box is characterized in that the top and the bottom of the crushing box are respectively provided with a straw inlet and a crushed material outlet, a plurality of round rods are arranged inside the crushing box, and two ends of the plurality of round rods are respectively fixed with two inner walls of the crushing box; the round rods are provided with rotating wheels and first motors, the output ends of the first motors are fixedly connected with the rotating wheels, and cutter teeth are distributed on the peripheries of the rotating wheels;
the fermentation device comprises: the top of the fermentation box is provided with a crushed material inlet and a waste water inlet side by side, and the crushed material inlet is communicated with the crushed material outlet; a fermented material outlet is formed in the position, close to the bottom, of the side wall of the fermentation box;
a second motor is fixed on the outer wall of the fermentation box, and a stirring shaft, stirring blades and a stirring turbine are arranged in the fermentation box; the stirring blade is arranged on the stirring shaft, the stirring turbine is sleeved on the stirring shaft, one end of the stirring shaft is rotatably connected with the inner wall of the fermentation box, and the other end of the stirring shaft penetrates through the fermentation box and is fixedly connected with the output end of the motor II.
The technical effect achieved by the technical scheme is as follows: in the crushing box, the rotating wheel takes the round rods as a rotating shaft, the motor is fixedly connected with the gear through the connecting rod, when the motor is started, the gear is driven to rotate, and the distance between the two round rods is equal to the diameter distance of one gear, so that the two adjacent gears are fully meshed together when rotating, and the straw is crushed; a stirring shaft and stirring blades are arranged in the fermentation box, one end of the stirring shaft is rotationally connected with the inner wall of the fermentation box through a bearing, and a second motor is fixedly connected with the other end of the stirring shaft through a connecting rod to drive the stirring shaft to rotate so as to stir the raw materials; sealing door is installed in the fermentation material export, and sealing door one end and export swivelling joint, the other end can be dismantled with the export and be connected, and the fermentation is accomplished the back, because the slope setting of (mixing) shaft, under the effect of the impetus of the rotation of (mixing) shaft and stirring turbine, the fermentation material of being convenient for discharge.
As a preferable technical scheme of the invention, a heating device is also arranged in the fermentation box, and the heating device is fixed at the bottom of the fermentation box.
The technical effect achieved by the technical scheme is as follows: the heating device can heat the air to provide the temperature required for anaerobic fermentation.
As the preferable technical scheme, the straw fermentation tank further comprises a support frame and a conveyor belt, the bottom end of the support frame is fixed to the bottom of the fermentation tank, the conveyor belt is fixed to the top end of the support frame, and the output end of the conveyor belt is communicated with the straw inlet.
The technical effect achieved by the technical scheme is as follows: the support frame is used for supporting the conveyer belt, when needing to the straw fermentation, only needs to place the straw on the conveyer belt, transports to the straw import by the conveyer belt, smashes.
As a preferable technical scheme of the invention, the outer wall of the fermentation box is also fixed with a blower, and the blower is communicated with the interior of the fermentation box.
The technical effect achieved by the technical scheme is as follows: when a small amount of fermentation materials are left in the fermentation box, the blower is started, so that the fermentation materials are discharged under the power of the blower.
As a preferable technical scheme of the invention, the model of the heating device is HG 140-75W.
As the preferred technical scheme of the invention, the blower is the model HG-120.
A method for fermenting by using the crop straw and pig wastewater mixed anaerobic fermentation device comprises the following steps:
1) crushing: putting crop straws into a crushing box for crushing, so that the crushed crop straws enter a fermentation box through a crushing material inlet;
2) composting: injecting clear water into the fermentation tank through the wastewater inlet, and stirring the crushed materials to ensure that the water content of the crushed materials is 50-60%, and performing stack retting for 3-4d to obtain stack retted materials;
3) anaerobic fermentation: after the stack retting is finished, injecting pig raising wastewater into a fermentation box through a wastewater inlet, sealing the straw inlet and the wastewater inlet, starting a second motor and a heating device, keeping the temperature in the fermentation box at 35-40 ℃, and carrying out stirring anaerobic fermentation; wherein the volume ratio of the pig raising wastewater to the stack retting material is 1 (4-5).
The technical effect achieved by the technical scheme is as follows: the straw is firstly crushed, so that the straw can be conveniently and fully piled, and the problem that the fermentation effect is not completely influenced by the piled retting caused by too large straw volume is prevented; before anaerobic fermentation, firstly performing stack retting on the crushed material, wherein the stack retting is an aerobic fermentation process, macromolecular substances in the straw can be partially decomposed into small molecular substances, so that a carbon source is provided for fermentation of the pig wastewater during subsequent fermentation, and the undecomposed macromolecular substances are fermented to generate methane; in anaerobic fermentation, the fermentation temperature is maintained at 35-40 ℃ to provide the optimum temperature for the vital activities of anaerobic microorganisms.
As a preferred technical scheme of the invention, in the step 1), the length of the crushed material is 1-2 cm.
As a preferable technical solution of the present invention, in the step 2), when performing stack retting on the pulverized material, the heating device is turned on to heat, and the temperature of stack retting is maintained at 30-35 ℃.
The technical effect achieved by the technical scheme is as follows: the optimal growth temperature of the oxygen consuming microorganism is 30-35 ℃, so that the stack retting temperature is controlled in the interval, macromolecular substances in the straws are conveniently decomposed into micromolecular substances, and a carbon source is provided for subsequent fermentation.
As the preferable technical scheme of the invention, in the step 3), the wastewater inlet is opened once every 4-5h during fermentation, so that the biogas can be conveniently collected.
The technical effect achieved by the technical scheme is as follows: during anaerobic fermentation, the stack retting material can generate biogas under the action of anaerobic microorganisms in the pig raising wastewater, so that the biogas in the stack retting material needs to be collected at regular time, and the phenomenon that the fermentation box is damaged due to overlarge internal pressure of the fermentation box is prevented; the pig-raising wastewater contains a large amount of nitrogen-containing and phosphorus-containing compounds, and can be used as the feed of livestock after being fermented together with the stack retting material under the action of microorganisms, so that the utilization rate of resources is improved.
In summary, the present invention provides a hybrid anaerobic fermentation device and method, which integrates crushing, retting and fermentation into a whole and can realize anaerobic fermentation of crop straw and wastewater.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram provided in embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram provided in embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1 and 3, an anaerobic fermentation device for mixing crop straws with swine wastewater comprises: a crushing box 1 and a fermentation box 2;
the top and the bottom of the crushing box 1 are respectively provided with a straw inlet 11 and a crushed material outlet 12, a plurality of round rods 13 are arranged inside the crushing box 1, and two ends of the plurality of round rods 13 are respectively fixed with two inner walls of the crushing box 1; the plurality of round rods 13 are provided with rotating wheels 14 and first motors 15, the output ends of the first motors 15 are fixedly connected with the rotating wheels 14, and cutter teeth 16 are distributed on the peripheries of the rotating wheels 14;
the top of the fermentation box 2 is provided with a crushed material inlet 21 and a waste water inlet 28 side by side, and the crushed material inlet 21 is communicated with the crushed material outlet 12; a fermented material outlet 13 is arranged at the position of the side wall of the fermentation box 2 close to the bottom; a second motor 25 is fixed on the outer wall of the fermentation box 2, and a stirring shaft 22, a stirring blade 23 and a stirring turbine 24 are arranged in the fermentation box 2; wherein, the stirring blade 23 is arranged on the stirring shaft 22, the stirring turbine 24 is sleeved on the stirring shaft 22, one end of the stirring shaft 22 is rotatably connected with the inner wall of the fermentation box 2, and the other end of the stirring shaft 22 penetrates through the fermentation box 2 and is fixedly connected with the output end of the motor II 25;
a heating device 26 is further arranged in the fermentation box 2, the model of the heating device 26 is HG140-75W, and the heating device 26 is fixed at the bottom of the fermentation box 2;
the outer wall of the fermentation box 2 is also fixed with a blower 27, the model of the blower 27 is HG-120, and the blower 27 is communicated with the interior of the fermentation box.
Example 2
As shown in fig. 2 and 3, an anaerobic fermentation device for mixing crop straws with swine wastewater comprises: the device comprises a crushing box 1, a fermentation box 2, a support frame 3 and a conveyor belt 4;
the top and the bottom of the crushing box 1 are respectively provided with a straw inlet 11 and a crushed material outlet 12, a plurality of round rods 13 are arranged inside the crushing box 1, and two ends of the plurality of round rods 13 are respectively fixed with two inner walls of the crushing box 1; the plurality of round rods 13 are provided with rotating wheels 14 and first motors 15, the output ends of the first motors 15 are fixedly connected with the rotating wheels 14, and cutter teeth 16 are distributed on the peripheries of the rotating wheels 14;
the top of the fermentation box 2 is provided with a crushed material inlet 21 and a waste water inlet 22 side by side, and the crushed material inlet 21 is communicated with the crushed material outlet 12; a fermented material outlet 13 is arranged at the position of the side wall of the fermentation box 2 close to the bottom; a second motor 25 is fixed on the outer wall of the fermentation box 2, and a stirring shaft 22, a stirring blade 23 and a stirring turbine 24 are arranged in the fermentation box 2; wherein, stirring leaf 23 is installed on (mixing) shaft 22, and stirring turbine 24 cup joints on (mixing) shaft 22, and (mixing) shaft 22 one end is rotated with 2 inner walls of fermenting case and is connected, and the other end runs through fermenting case 2 and with two 25 output end fixed connection of motor
A heating device 26 is further arranged in the fermentation box 2, the model of the heating device 26 is HG140-75W, and the heating device 26 is fixed at the bottom of the fermentation box 2;
the bottom end of the support frame 3 is fixed with the bottom of the fermentation box 2, the transmission belt 4 is fixed at the top end of the support frame 3, and the output end of the transmission belt 4 is communicated with the straw inlet 11;
the outer wall of the fermentation box 2 is also fixed with a blower 27, the model of the blower 27 is HG-120, and the blower 27 is communicated with the interior of the fermentation box.
The working principle is as follows: when the straws need to be fermented, the first motor 15, the second motor 25 and the blower 27 are started, the straws are placed into the crushing box 1 to be crushed, then the crushed straws sequentially pass through the crushed material outlet 12 and the crushed material inlet 21 to enter the fermentation box 2, at the moment, the temperature sensor 6 arranged at the bottom of the fermentation box 2 automatically senses the temperature in the fermentation box 2 and transmits signals to the heating controller 5 electrically connected with the temperature sensor 6, and the heating controller 5 controls the heating device 26 electrically connected with the heating controller 5 to heat the fermentation box 2 according to the temperature detected by the temperature sensor 6. The heating controller 5 is model JK2 PSZ-48125.
Example 3
The method of fermentation using example 2 included:
1) crushing: putting 200kg of crop straws into a crushing box for crushing, so that the crushed crop straws enter a fermentation box through a crushed material inlet, wherein the length of the crushed material is 1 cm;
2) composting: injecting clear water into the fermentation tank through a wastewater inlet, opening the heating device to heat, keeping the temperature of stack retting at 30 ℃, and stirring the crushed materials to ensure that the water content of the crushed materials is 50%, and performing stack retting for 3d to obtain stack retting materials;
3) anaerobic fermentation: after the stack retting is finished, injecting pig raising wastewater into the fermentation box through the wastewater inlet, sealing the straw inlet and the wastewater inlet, starting the second motor and the heating device, keeping the temperature in the fermentation box at 35 ℃, performing stirring anaerobic fermentation, and starting the wastewater inlet once every 4 hours so as to conveniently collect biogas; wherein the volume ratio of the pig raising wastewater to the stack retting material is 1: 5.
Example 4
The method of fermentation using example 2 included:
1) crushing: putting 200kg of crop straws into a crushing box for crushing, so that the crushed crop straws enter a fermentation box through a crushed material inlet, wherein the length of the crushed material is 2 cm;
2) composting: injecting clear water into the fermentation tank through a waste water inlet, opening the heating device to heat, keeping the temperature of stack retting at 35 ℃, and stirring the crushed materials to ensure that the water content of the crushed materials is 60 percent, and performing stack retting for 4d to obtain stack retting materials;
3) anaerobic fermentation: after the stack retting is finished, injecting pig raising wastewater into the fermentation box through the wastewater inlet, sealing the straw inlet and the wastewater inlet, starting the second motor and the heating device, keeping the temperature in the fermentation box at 40 ℃, performing stirring anaerobic fermentation, and starting the wastewater inlet once every 5 hours so as to conveniently collect biogas; wherein the volume ratio of the pig raising wastewater to the stack retting material is 1: 4.
Example 5
The method of fermentation using example 2 included:
1) crushing: putting 200kg of crop straws into a crushing box for crushing, so that the crushed crop straws enter a fermentation box through a crushed material inlet, wherein the length of the crushed material is 1 cm;
2) composting: injecting clear water into the fermentation tank through a wastewater inlet, opening the heating device to heat, keeping the temperature of stack retting at 32 ℃, and stirring the crushed materials to ensure that the water content of the crushed materials is 55%, and stack retting for 3.5 days to obtain stack retting materials;
3) anaerobic fermentation: after the stack retting is finished, injecting pig raising wastewater into the fermentation box through the wastewater inlet, sealing the straw inlet and the wastewater inlet, starting the second motor and the heating device, keeping the temperature in the fermentation box at 37 ℃, performing stirring anaerobic fermentation, and starting the wastewater inlet once every 4.5 hours so as to conveniently collect biogas; wherein the volume ratio of the pig raising wastewater to the stack retting material is 1: 4.
Comparative example 1: fermentation was carried out according to the method of example 5, except that the retting process of step 2) was eliminated;
comparative example 2: the fermentation was carried out according to the method of example 5, except that the water content in step 2) was maintained at 40%;
comparative example 3: the fermentation was carried out according to the method of example 5, except that the water content in step 2) was maintained at 70%;
comparative example 4: the fermentation was carried out according to the method of example 5, except that in step 3), the fermentation temperature was maintained at 20 ℃;
comparative example 5: the fermentation was carried out according to the method of example 5, except that in step 3), the fermentation temperature was maintained at 45 ℃.
Fermenting for 24h, and counting the methane production (L), the average methane production rate (L/h) and the solid decrement (%); the results are shown in Table 1;
TABLE 1
As can be seen from table 1, stack retting has the greatest influence on the fermentation result, and can significantly improve the yield of biogas and improve the utilization rate of straw and pig wastewater; besides, the water content and fermentation temperature of the stack retting also have obvious influence on the fermentation result, so the fermentation temperature is controlled to be 35-40 ℃.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a crop straw and waste water mixed anaerobic fermentation device of raising pigs, includes: reducing mechanism and fermenting installation, its characterized in that, reducing mechanism includes: the straw crushing box comprises a crushing box (1), wherein the top and the bottom of the crushing box (1) are respectively provided with a straw inlet (11) and a crushed material outlet (12), a plurality of round rods (13) are arranged inside the crushing box (1), and two ends of the plurality of round rods (13) are respectively fixed with two inner walls of the crushing box (1); a rotating wheel (14) and a first motor (15) are mounted on the round rods (13), the output end of the first motor (15) is fixedly connected with the rotating wheel (14), and cutter teeth (16) are distributed on the periphery of the rotating wheel (14);
the fermentation device comprises: the top of the fermentation box (2) is provided with a crushed material inlet (21) and a waste water inlet (28) side by side, and the crushed material inlet (21) is communicated with the crushed material outlet (12); a fermented material outlet (13) is formed in the position, close to the bottom, of the side wall of the fermentation box (2);
a second motor (25) is fixed on the outer wall of the fermentation box (2), and a stirring shaft (22), a stirring blade (23) and a stirring turbine (24) are arranged in the fermentation box (2); the stirring blade (23) is installed on the stirring shaft (22), the stirring turbine (24) is sleeved on the stirring shaft (22), one end of the stirring shaft (22) is rotatably connected with the inner wall of the fermentation box (2), and the other end of the stirring shaft penetrates through the fermentation box (2) and is fixedly connected with the output end of the second motor (25).
2. The anaerobic fermentation device for mixing crop straws and pig wastewater as claimed in claim 1, characterized in that a heating device (26) is further arranged in the fermentation tank (2), and the heating device (26) is fixed at the bottom of the fermentation tank (2).
3. The anaerobic fermentation device for mixing crop straws and pig wastewater as claimed in claim 2, wherein the type of the heating device (26) is HG140-75W 3.
4. The crop straw and pig wastewater mixing anaerobic fermentation device according to claim 1, characterized in that a blower (26) is further fixed on the outer wall of the fermentation tank (2), and the blower (26) is communicated with the interior of the fermentation tank.
5. The anaerobic fermentation device for mixing crop straw with swine wastewater as claimed in claim 4, wherein the blower (27) is model HG-120.
6. The crop straw and pig wastewater mixed anaerobic fermentation device according to claim 1, characterized by further comprising a support frame (3) and a conveyor belt (4), wherein the bottom end of the support frame (3) is fixed with the bottom of the fermentation box (2), the conveyor belt (4) is fixed at the top end of the support frame (3), and the output end of the conveyor belt (4) is communicated with the straw inlet (11).
7. A method for fermenting by using the crop straw and pig wastewater mixed anaerobic fermentation device of any one of claims 1 to 6, which is characterized by comprising the following steps:
1) crushing: putting crop straws into a crushing box for crushing, so that the crushed crop straws enter a fermentation box through a crushing material inlet;
2) composting: injecting clear water into the fermentation tank through the wastewater inlet, and stirring the crushed materials to ensure that the water content of the crushed materials is 50-60%, and performing stack retting for 3-4d to obtain stack retted materials;
3) anaerobic fermentation: after the stack retting is finished, injecting pig raising wastewater into a fermentation box through a wastewater inlet, sealing the straw inlet and the wastewater inlet, starting a second motor and a heating device, keeping the temperature in the fermentation box at 35-40 ℃, and carrying out stirring anaerobic fermentation; wherein the volume ratio of the pig raising wastewater to the stack retting material is 1 (4-5).
8. The method for fermentation by using the anaerobic fermentation device for mixing crop straws and swine wastewater as claimed in claim 7, wherein the length of the crushed material in the step 1) is 1-2 cm.
9. The method as claimed in claim 7, wherein the step 2) is performed by turning on a heating device to heat the smashed materials while the stack retting is performed, and the stack retting temperature is maintained at 30-35 ℃.
10. The method for fermentation by using the anaerobic fermentation device for mixing crop straws and pig wastewater as claimed in claim 7, wherein in the step 3), the wastewater inlet is opened every 4-5h during fermentation, so as to facilitate the collection of biogas.
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