阅读说明：本技术 一种城镇湿垃圾厌氧发酵方法、装置及其控制方法 (Anaerobic fermentation method, device and control method for wet garbage in cities and towns ) 是由 冯雷雨 王婷婷 陈银广 郑雄 李小露 张学萌 陈玥汐 胡婉莹 于 2020-12-29 设计创作，主要内容包括：一种城镇湿垃圾厌氧发酵方法,扩大均匀混合区的范围,同时使整个反应器构成一个循环时间较短的循环流,从而使整个反应器混合更为均匀。通过搅拌使得城镇湿垃圾在厌氧发酵过程中处于流动状态,使得发酵液和微生物之间达到最大程度的接触,从而在较短的时间内完成所需要的混合、传热或者进行生化反应过程。实现所述厌氧发酵方法的厌氧发酵装置,该装置采用大直径、高盘面比、低功率数的轴向流桨,设置导流筒协助实现流体定向流动。本发明还提供了所述厌氧发酵装置的控制方法。本发明在输送搅拌中实现物料沿轴向分别向两端连续运动,提高搅拌效果,有助于实现提高生产效率,降低运行成本的目的。(The anaerobic fermentation method for wet garbage in town expands the range of homogeneous mixing area and makes the whole reactor constitute one circulating flow with short circulating time to result in homogeneous mixing. The town wet garbage is in a flowing state in the anaerobic fermentation process through stirring, so that the fermentation liquor and the microorganisms are in maximum contact, and the required mixing, heat transfer or biochemical reaction process is completed in a short time. The anaerobic fermentation device for realizing the anaerobic fermentation method adopts the axial flow paddle with large diameter, high disc surface ratio and low power number, and is provided with the guide cylinder to assist in realizing the directional flow of the fluid. The invention also provides a control method of the anaerobic fermentation device. The invention realizes the continuous movement of the materials towards two ends respectively along the axial direction in the conveying and stirring processes, improves the stirring effect, and is beneficial to realizing the purposes of improving the production efficiency and reducing the operation cost.)

1. The anaerobic fermentation method for wet garbage in cities and towns is characterized by comprising the following steps: the range of the uniform mixing area is enlarged, and simultaneously, the whole reactor forms a circulating flow with shorter circulating time, so that the whole reactor is mixed more uniformly.

2. The anaerobic fermentation process of claim 1, wherein: the town wet garbage is in a flowing state in the anaerobic fermentation process through stirring, so that the fermentation liquor and the microorganisms are in maximum contact, and the required mixing, heat transfer or biochemical reaction process is completed in a short time.

3. The anaerobic fermentation process of claim 2, wherein: the device also comprises a thrust force applied to the fluid in the axial direction, the shearing force of the fluid is reduced, the fluid is promoted to directionally flow in the guide cylinder, the fluid flow is in a turbulent flow state, and the fluid is fully stirred and mixed.

4. An anaerobic fermentation apparatus for carrying out the anaerobic fermentation method according to any one of claims 1 to 3, characterized in that: the device adopts axial flow paddles with large diameter, high disc surface ratio and low power number, and is provided with a guide cylinder to assist in realizing directional flow of fluid.

5. The anaerobic fermentation device of claim 4, wherein: the fermentation tank comprises a fermentation tank body, wherein the fermentation tank body comprises a tank body, a cylindrical guide cylinder with a hollow interior is arranged in the tank body, a sealing cover is arranged at the top of the tank body, and an end enclosure and a base are arranged at the bottom of the tank body; the fermentation tank is characterized in that a power device is arranged above the fermentation tank body, the output end of the power device is connected with a stirring shaft, the stirring shaft is located inside the tank body and penetrates through the guide cylinder, and stirring blades are arranged on the stirring shaft.

6. The anaerobic fermentation device of claim 5, wherein: the stirring paddle is a three-wide-blade axial-flow downward pressing paddle.

7. The anaerobic fermentation device of claim 5, wherein: the stirring blades are arc-shaped, the disc surface ratio is 0.53-0.56, and the diameter is 75-85 mm; preferably, the disc face ratio is 0.55 and the diameter is 80 mm.

8. The anaerobic fermentation device of claim 5, wherein: the stirring shaft is provided with two stirring blades which are arranged in parallel, one stirring blade is positioned in the guide shell, the other stirring blade is positioned below the guide shell, and the distance between the two stirring blades can be adjusted; preferably, the ratio of the diameter of the stirring blade to the diameter of the barrel body is 0.50-0.60, and the diameter of the stirring blade is smaller than that of the guide shell.

9. The anaerobic fermentation device of claim 5, wherein: the radius of the guide shell is 70-75% of that of the barrel body.

10. The anaerobic fermentation device of claim 5, wherein: the upper end of the guide cylinder is located at 3/5-4/5 of the height of the interior of the barrel body, and the lower end of the guide cylinder is located at 1/3-1/5 of the height of the interior of the barrel body.

11. The anaerobic fermentation device of claim 5, wherein: the guide cylinder is fixed on the inner wall of the barrel body through a connecting piece.

12. The anaerobic fermentation device of claim 5, wherein: the radius of the guide shell is 71% -72% of that of the barrel body.

13. The anaerobic fermentation device of claim 5, wherein: the upper end of the guide cylinder is located at 13/20-3/4 of the height of the interior of the barrel body, and the lower end of the guide cylinder is located at 1/4-3/10 of the height of the interior of the barrel body.

14. The anaerobic fermentation device of claim 5, wherein: and the stirring paddle blade is provided with a screw for adjusting the position of the stirring paddle blade on the stirring shaft.

15. The method for controlling an anaerobic fermentation apparatus according to claim 5, comprising the steps of:

step 1, feeding, namely opening a sealing cover to enable raw materials to enter the barrel body through a barrel opening, and sealing the sealing cover and the barrel body in a matched mode after the raw materials are placed;

step 2, starting a power device to drive an output shaft to rotate, and stirring raw materials in the barrel body through the matching of a stirring rod in the barrel body and a stirring blade;

step 3, regulating the speed, and regulating the rotating speed of the output shaft to enable the raw materials in the barrel body to be stably stirred until no vortex is generated;

step 4, operation, sampling, temperature measurement and pH adjustment are carried out in the running process of the device;

and 5, discharging, namely separating the stirring rod from the output shaft, and pouring the residual waste liquid of anaerobic fermentation from the barrel body.

16. The anaerobic fermentation apparatus control method according to claim 15, wherein: the material flow state in the barrel body can be controlled to be axial flow through the three-wide-blade axial flow pressing paddle arranged on the stirring shaft in parallel.

17. The anaerobic fermentation apparatus control method according to claim 15, wherein: the power device is a motor with adjustable rotating speed.

Technical Field

The invention belongs to the field of environmental protection technology and machinery, and relates to an anaerobic fermentation method and device for urban wet garbage.

Background

With the increase of the population of the world and the gradual improvement of the living standard, the yield of the urban wet garbage, particularly the kitchen garbage, tends to increase year by year, and the treatment problem is increasingly emphasized. The kitchen waste contains high moisture and organic matters, is easy to decay and generate stink, but can be converted into new energy rich in the organic matters through proper treatment and processing, and the kitchen waste after strict treatment can be used as fertilizer and feed, and can even be used for generating electricity and preparing biofuel. From the sustainable development perspective, anaerobic fermentation is the mainstream technology of kitchen waste treatment at present.

The fermentation equipment is one of the most important equipment in microbial engineering, and reliable fermentation equipment is the highest guarantee for stable product quality and improvement of economic benefits. The fermentation equipment is divided into an aerobic fermentation tank and an anaerobic fermentation tank according to whether oxygen is needed for fermentation. However, the practical application in production mainly comprises aerobic microbial fermentation, so that the aerobic fermentation tank has the most varieties and is studied most thoroughly, and the anaerobic fermentation system is less studied.

The stirring structure of the existing anaerobic fermentation tank can cause the condition that the inner surface and the bottom of the fermentation tank are not stirred for a long time due to incomplete stirring, so that the stirring is not uniform, the stirring efficiency of the fermentation tank is influenced, and the quality and the efficiency of the fermentation are influenced. The axial flow stirring paddle is widely used in chemical industry, drying and cooling and other industrial processes, is an important internal component of a stirring type reactor, generally consists of a hub and blades, and the design of the blades is the key of the design of the stirring paddle. At present, three axial flow stirring propellers are commonly used in the chemical industry, namely a symmetrical straight blade propeller, a circular tube propeller and an asymmetrical straight blade propeller. The three stirring paddles are applied to the axial continuous stirrer, so that the stirring shear force is insufficient, the effect is poor, particularly, good effect is difficult to achieve in medium and high viscosity Newtonian fluid and non-Newtonian fluid, the production efficiency is limited, and the operation cost is improved.

Therefore, it is necessary to develop an axial flow stirring anaerobic fermentation method, device and control method for urban wet garbage, particularly kitchen garbage, to solve the technical problems.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a town wet garbage anaerobic fermentation method, a town wet garbage anaerobic fermentation device and a town wet garbage anaerobic fermentation control method, and is particularly suitable for treating kitchen garbage.

The invention adopts the following technical scheme:

the anaerobic fermentation method for wet garbage in cities and towns greatly expands the range of a uniform mixing area, and simultaneously enables the whole reactor to form a circulating flow with short circulating time, thereby enabling the whole reactor to be mixed more uniformly.

Specifically, the kitchen waste is in a flowing state in the anaerobic fermentation process through stirring, so that organic matters can be effectively utilized by fermenting microorganisms, and the fermentation effect is improved. The agitation process maximizes contact between the fermentation broth and the microorganisms, thereby accomplishing the desired mixing, heat transfer, or biochemical reaction processes in a relatively short period of time. The stirring has the main function of mixing, so that microbial cells are suspended and dispersed in a fermentation system, the high-speed and high-efficiency fermentation process is facilitated, and the heat transfer process is enhanced.

Furthermore, the fluid mainly exerts axial thrust, and the shearing force of the fluid is small, so that the influence on microorganisms is small, and the microorganisms can keep high activity; the directional flow of the fluid in the guide shell is promoted, so that the fluid flow is in a turbulent flow state, and the fluid is fully stirred and mixed.

Under the combined action of stirring and flow guiding, the fluid in the whole reactor is uniformly mixed in an axial flow state.

The anaerobic fermentation device for realizing the method realizes the aim by adopting the axial flow paddle with large diameter, high disc surface ratio and low power number and arranging the guide cylinder, and comprises the following steps:

the fermentation cylinder body, the fermentation cylinder body includes the staving, the inside draft tube that is equipped with of staving, the draft tube is fixed on the staving inner wall through three connecting piece, is cylindrical and inside cavity, and the radius is staving radial 70% ~ 75%, and the upper end is located the 3/5 ~ 4/5 department of staving internal height, and the lower extreme is located the 1/3 ~ 1/5 department of staving internal height, the staving top is equipped with sealed lid, the staving bottom is equipped with head and base. The fermentation tank is characterized in that a motor is arranged above the fermentation tank body, the output end of the motor is connected with a stirring shaft, the stirring shaft is positioned inside the tank body, two stirring blades are arranged on the stirring shaft, the stirring blades are three wide-blade axial flow pressing blades, the stirring shaft is arranged in parallel, one stirring blade is positioned inside the guide cylinder, the other stirring blade is positioned below the guide cylinder, and the distance between the two stirring blades can be adjusted.

Preferably, the barrel body is sealed through a sealing cover, so that air is prevented from entering, the anaerobic environment in the tank is maintained, and odor generated in the fermentation process is prevented from leaking.

More preferably, the radius of the guide shell is 71% -72% of the radius of the barrel body.

Preferably, the upper end of the guide shell is located at 13/20-3/4 of the height of the interior of the barrel body, and the lower end of the guide shell is located at 1/4-3/10 of the height of the interior of the barrel body.

Preferably, the stirring blades are arc-shaped and have a large disc surface ratio (the ratio of the projected area of the stirrer when it is stationary to the area swept by it when it is rotating) and diameter; preferably, the disc face ratio is 0.55 and the diameter is 80 mm. When the radius of the stirring paddle is too small, the axial and circumferential movement strength of the material in the blade is weak; when the radius of the stirring blade is too large, the gap between the edge of the blade and the wall of the tank is small, so that the phenomenon of uneven mixing is easy to occur, and therefore, the ratio of the diameter of the stirring blade to the diameter of the tank body is designed to be 0.50-0.60, and the diameter of the stirring blade is smaller than that of the guide shell (100 mm).

Preferably, the stirring paddle is provided with a screw for adjusting the position of the stirring paddle on the stirring shaft; screws capable of adjusting the tightness of the connecting pieces are arranged at the connecting pieces of the stirring blades and the stirring shaft, and the stirring blades can be fixed at any position of the stirring shaft through the connecting pieces by adjusting the screws; or, can set up a plurality of screw holes in advance on the epaxial different positions of stirring, stirring paddle leaf passes through the screw fixation on certain screw hole, adjusts stirring paddle leaf position on the (mixing) shaft through selecting different screw holes.

Preferably, the bottom of the barrel body is provided with a seal head and a base. The base is arranged to facilitate the stable placement of the reactor; set up the head and help avoiding fermentation system to produce the blind spot at the in-process of stirring, the head combines together with classic cylinder fermentation cylinder structure, can improve fermentation system's circulation flow performance, realizes anaerobic fermentation's high efficiency.

A control method of an urban wet garbage axial flow stirring anaerobic fermentation tank is based on the urban wet garbage axial flow stirring anaerobic fermentation device and comprises the following steps:

step 1, feeding, namely opening a sealing cover to enable raw materials to enter the barrel body through a barrel opening, and sealing the sealing cover and the barrel body in a matched mode after the raw materials are placed;

step 2, supplying power, wherein an external power supply provides required electric energy for an electric appliance of the device;

step 3, operating, starting a motor, driving an output shaft to rotate, and stirring raw materials in the barrel body by matching a stirring rod in the barrel body with a stirring blade;

step 4, regulating the speed, and regulating the rotating speed of the motor to enable the raw materials in the barrel body to be stably stirred until no vortex is generated;

step 5, operating, wherein the processes of sampling, temperature measurement, pH adjustment and the like in the running process of the device are all operated by opening a sealing cover;

and 6, discharging, namely separating the stirring rod from the output end of the motor, opening the sealing cover, and taking out a stirring system formed by the stirring rod and the stirring blades in the barrel to directly pour out the residual waste liquid of anaerobic fermentation from the interior of the barrel body.

Preferably, the material flow state in the barrel body can be controlled to be axial flow through two three-wide-blade axial flow downward pressing paddles which are arranged in parallel on the stirring shaft.

Preferably, in the step 3, the motor drives the output shaft to rotate.

Preferably, in the step 4, the rotation speed of the motor is adjustable.

Fermentation liquid of a plurality of important biochemical reaction processes (such as organic acid, antibiotic, enzyme preparation fermentation and the like) belongs to a filamentous or bacteria-ball-shaped non-Newtonian system and has complex rheological characteristics of high viscosity, shear thinning and the like. This non-newtonian regime and fermentation process is greatly affected by the reactor configuration, particularly the form of agitation, and changes in the shear stress of the fluid in the tank have a greater effect on filamentous growth. Large shearing, easy damage of hyphae and unfavorable growth and fermentation of thalli; the shearing is small, the hypha is not easy to break under the action of external force, and the hypha can grow well and is beneficial to fermentation. The change of the shearing action formed during the stirring of the traditional disc turbine blade is quite large in the whole tank, the stirring energy consumption is large, the whole tank is mixed due to the formation of a radial flow pattern, the regional phenomenon exists, the mixing is more serious in fermentation liquor with higher viscosity, the mixing efficiency is further reduced, and the fermentation of filamentous fungi is not favorable; the axial stirring paddle has good circulation performance when being mixed in the whole tank, so that liquid in the tank flows uniformly, the shearing change in the whole tank is small, the stirring paddle is beneficial to filamentous fungus fermentation, and the stirring energy consumption is further reduced.

Due to the adoption of the technical scheme, the invention has the following advantages:

1. the raw materials in the barrel are pressed downwards through a specific stirring paddle, namely a three-wide-blade axial flow pressing paddle, so that the raw materials respectively move towards two ends continuously along the axial direction and are stirred uniformly;

2. the design of the guide cylinder is beneficial to the movement of raw materials in the cylinder, the circulating fluidity is good, and the reaction solution in the fermentation tank is uniformly distributed;

3. the whole fermentation system has simple structure and convenient operation and maintenance;

4. the barrel body is made of organic glass, so that the cost is low, and the processing and the manufacturing are convenient.

Drawings

FIG. 1 is a schematic view of an anaerobic fermentation system of the present invention.

FIG. 2a is a cross-sectional view of an embodiment of a stirring blade attachment of the present invention.

FIG. 2b is a cross-sectional view of an embodiment of a stirring blade of the present invention.

FIG. 2c is a top view of an embodiment of a stirring blade of the present invention.

FIG. 2d is an illustration of an exemplary embodiment of a stirring blade according to the present invention.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

As shown in fig. 1, a kitchen garbage axial flow stirring anaerobic fermentation tank controlling means, including the fermentation cylinder body, the fermentation cylinder body includes staving 3, 3 inside draft tube 4 that are equipped with of staving, draft tube 4 is fixed on 3 inner walls of staving through three connecting piece 5, is cylindrical and inside cavity, and the radius is the radial 71.43% of staving 3, and the upper end is located the 7/10 department of 3 internal heights of staving, and the lower extreme is located the 4/15 departments of 3 internal heights of staving, 3 tops of staving are equipped with sealed lid 2, 3 bottoms of staving are equipped with head 10 and base 11. The control device still includes the motor of an external power supply, the output of motor is connected with (mixing) shaft 1, (mixing) shaft 1 is located staving 3 insidely, be equipped with two stirring paddle leaf 6 and 8 on the (mixing) shaft 1, stirring paddle leaf 6 and 8 are three wide leaf axial flows and push down the oar, in parallel mount on (mixing) shaft 1, screw 7 and 9 adjustment on stirring paddle leaf 6 and 8 respectively can be passed through to the position on (mixing) shaft 1, and one of them is located inside draft tube 4, another then is located 4 below the draft tube, and the interval is adjustable between the two, cooperatees with the draft tube and realizes the material respectively along axial to both ends continuous motion.

As shown in figure 2, the three-wide-blade axial flow downward pressing paddle adopts a proper paddle streamline shape and a larger disc surface ratio (the ratio of the projected area when the stirrer is static to the area swept by the stirrer when the stirrer rotates), and the axial flow paddle with the large diameter (80mm), the high disc surface ratio (0.55) and the low power number improves the flowing and mixing conditions of the fluid in the whole reactor, shortens the circulation time of fermentation liquor, enlarges the range of a uniform mixing zone and eliminates dead zones.

In the embodiment shown in fig. 1, the raw materials are fed by opening the sealing cover, the sampling operation and the waste liquid discharge are detected, the anaerobic environment in the barrel is maintained by the cooperation of the barrel and the sealing cover, and the stirring system which is controlled by the external power supply and is composed of the adjustable-speed motor and the stirring rod is driven by the adjustable-speed motor to stably stir the raw materials in the barrel.

In the embodiment shown in fig. 1 and 2, the stirring rod and two stirring blades cooperate to control the axial flow state and the mixing state of the raw materials in the anaerobic fermentation tank, and the viscosity of the fermented liquid can change greatly, and for different samples, the relative positions of the two stirring blades on the stirring shaft need to be adjusted, so that the stirring blades with adjustable positions can be selected to realize the axial flow state, and the stirring blades with adjustable positions can be adjusted conveniently by comparing with fixed stirring blades under the condition of ensuring the axial flow state when different samples are stirred. The axial flow state of the raw materials in the system is also controlled by the action of the guide shell, and the two stirring blades are respectively arranged inside and below the guide shell, so that the raw materials in the shell can be pressed downwards, and the raw materials respectively move towards two ends continuously along the axial direction and are stirred uniformly; simultaneously, be cylindrical and inside cavity with the draft tube design, the radius designs into staving radial 71.43%, and the upper end setting can do benefit to the motion of raw materials in the 7/10 department of staving internal height, and circulating fluidity is good, and reaction solution distributes evenly in the fermentation cylinder. In addition, the fermentation tank has simple structure, convenient processing and manufacturing, low cost and convenient operation and maintenance.

The working principle of the control device is as described in the first embodiment.

Based on the kitchen waste axial flow stirring anaerobic fermentation tank control device, a kitchen waste axial flow stirring anaerobic fermentation tank control method executes the following steps:

step 1, feeding, namely opening a sealing cover 2 to enable raw materials to enter a barrel body 3 through a barrel opening, and sealing the sealing cover 2 and the barrel body 3 in a matched mode after the raw materials are put into the barrel body;

step 2, supplying power, wherein an external power supply provides required electric energy for an electric appliance of the device;

step 3, operating, starting a motor, driving an output shaft to rotate, and stirring the internal raw materials by matching an internal stirring rod 1 with stirring blades 6 and 8;

and 4, regulating the speed, and regulating the rotating speed of the motor to enable the slurry to be stably stirred until no vortex is generated.

And step 5, operating, wherein the processes of sampling, temperature measurement, pH adjustment and the like in the running process of the device are all operated by opening the sealing cover 2.

And 6, discharging, namely taking out a stirring system consisting of the stirring rod 1 and the stirring blades 6 and 8 in the barrel, and opening the sealing cover 2 to directly pour out the residual waste liquid of anaerobic fermentation from the interior of the barrel body 3.

The kitchen waste axial flow stirring anaerobic fermentation tank control method is clear, actual kitchen waste anaerobic fermentation is carried out by using the kitchen waste axial flow stirring anaerobic fermentation device, and the experimental steps and results are as follows:

collecting the kitchen waste in the dining room of the university of Tongji, mincing the kitchen waste by an electric stirrer, adding water to adjust the total solid content to 13g/L to obtain a kitchen waste mixed solution, and measuring the main properties as shown in Table 1.

TABLE 1 Main Properties of sludge and kitchen waste

Remarking: 1) all analytical indexes were measured three times and the results were expressed as mean ± standard deviation;

2) the units of TSS, VSS, TCOD and SCOD are all mg/L;

3) the total protein, total carbohydrate and total lipids are in mg/L units.

Placing 3.5L of mixed liquid of the kitchen waste into a reaction device, and adding the mixed liquid into the kitchen wasteInoculating sludge in the garbage mixed liquid according to the proportion of the kitchen garbage/inoculated sludge being 9 for fermentation treatment, adjusting the rotating speed of a stirring paddle to ensure that the materials in the tank are uniformly mixed, preventing vortex generated in the stirring process from causing dissolved oxygen of a fermentation system, and maintaining the anaerobic environment of the fermentation system; selecting a pH value suitable for anaerobic fermentation of the kitchen waste to produce acid; in the present example, the stirring paddle rotates at 90 rpm, the fermentation is carried out for 10 days at 25 ℃, and 4 mol.L is used^-1NaOH or 4 mol. L^-1The pH was adjusted with HCl 1 time a day to 6.0.

Sampling on days 1, 2, 3, 4, 7 and 8 respectively, centrifuging the sample at 11000rpm for 2min, performing pressure filtration on the supernatant with 0.45 μm filter membrane, collecting the filtrate in 1.5mL brown vial special for gas chromatography, and adding 3% H into the vial₃PO₄To ensure that the pH of the sample is less than 5.0. The components of VFAs and VFAs are measured by adopting a GC9790 III type gas chromatograph, the yield and the proportion of acetic acid in the components are focused, and the effect of producing the acetic acid by fermenting the kitchen waste in an axial flow stirring anaerobic fermentation device is obtained according to the analysis of the obtained experimental data.

The results of the experiment are shown in table 2. The concentration of VFAs as a whole showed a tendency to rise with increasing fermentation time. The maximum yield of VFAs in the fermentation liquid is 7248 mgCOD.L on the 4 th day of fermentation^-1. The concentration of VFAs reaches the maximum value and is increased by 298.24% compared with the first day of fermentation, wherein the concentration of acetic acid is increased by 477.42% compared with the first day of fermentation, and the ratio of acetic acid is also increased from 18% to 28%. The anaerobic fermentation device provided by the invention can be used for greatly improving the acid production amount of the kitchen waste through anaerobic fermentation, particularly the acetic acid yield, and the anaerobic fermentation device is favorable for improving the activity of hydrolysis acid-producing bacteria by improving the mixing state of materials, so that the anaerobic fermentation effect is improved, and the acid production of the kitchen waste through anaerobic fermentation is promoted.

TABLE 2 acid production test results of kitchen garbage fermentation

Remarking: the unit of the total VFAs is mgCOD.L^-1The unit of acetic acid is mg.L^-1

The anaerobic fermentation method, the device and the control method for axial flow stirring of the kitchen waste comprise a fermentation tank body, wherein the fermentation tank body comprises a tank body, a guide cylinder is arranged in the tank body and fixed on the inner wall of the tank body through three connecting pieces, the guide cylinder is cylindrical and hollow, a sealing cover is arranged at the top of the tank body, and a sealing head and a base are arranged at the bottom of the tank body. The fermentation cylinder body top is equipped with the motor, and the output of motor is connected with the (mixing) shaft, and the (mixing) shaft is located inside the staving, is equipped with two stirring paddle leaf on the (mixing) shaft, and one is located inside the draft tube, another then is located the draft tube below. The invention completes the feeding of raw materials, the detection sampling operation and the discharge of waste liquid by opening the sealing cover, maintains the anaerobic environment in the barrel body by the matching of the barrel body and the sealing cover, and adopts a stirring system consisting of a stirring rod and two stirring blades driven by a speed-adjustable motor controlled by an external power supply to complete the stable stirring of the raw materials in the barrel body. This patent adopts parallel mount to stir epaxial two three wide leaf axial flows to push down paddle leaf and draft tube and cooperatees and realizes the material along the axial respectively to both ends continuous motion in carrying the stirring, improves stirring effect, helps realizing improving production efficiency, reduces running cost's purpose.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.