Dry anaerobic fermentation system for organic wastes

Abstract

The utility model relates to a dry anaerobic fermentation system for organic wastes, which belongs to the technical field of organic waste treatment and comprises a hydrolysis system, an anaerobic system, first conveying equipment and a pipeline mixer, the hydrolysis system comprises a hydrolysis tank, the anaerobic system comprises a dry anaerobic bin, and first material conveying equipment is used for conveying materials in the hydrolysis system into the dry anaerobic bin; a feed port of the pipeline mixer is connected with a raw material pipe and a return pipe, the other end of the return pipe is communicated with a discharge port of the dry anaerobic bin, and the pipe wall of the return pipe is communicated with a first branch pipe extending into the hydrolysis tank. According to the system disclosed by the utility model, the hydrolysis stage of organic wastes can be completed in the hydrolysis tank of an independent system, and the problems of low degradation speed and low degradation rate of organic matters caused by high material concentration in a dry anaerobic fermentation system are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to organic waste treatment technical field especially is related to a kind of organic waste dry anaerobic fermentation system. BACKGROUND

[0002] Organic garbage refers to straw, livestock and poultry manure, kitchen garbage, kitchen waste, municipal sludge and other waste containing organic components. With the improvement of garbage disposal technology and the popularization of garbage classification action in China, the separation rate of organic garbage as an important part of the garbage system has improved significantly. And, through anaerobic fermentation technology, organic garbage is converted into biogas, which is currently the most promising and environmentally friendly technology.

[0003] Anaerobic fermentation technology refers to the biochemical process in which organic matter is ultimately decomposed into mixed gases such as methane and carbon dioxide under corresponding moisture, temperature and anaerobic conditions through the growth and metabolism of a variety of microorganisms. Anaerobic fermentation technology is divided into wet anaerobic fermentation and dry anaerobic fermentation. Wet anaerobic technology has low organic load and high water content, usually with a water content of more than 90%. Dry anaerobic fermentation has high organic load and high solid content, usually with a solid content of 15-40%.

[0004] The anaerobic fermentation process is usually divided into three parts: hydrolysis stage, acid production stage and methane production stage. In the hydrolysis stage, macromolecular organic matter is converted into organic acids and alcohol by hydrolysis bacteria; in the acid production stage, organic acids and alcohol are converted into short-chain fatty acids, hydrogen and carbon dioxide by hydrogen-producing and acetate-producing bacteria; in the methane production stage, methanogenic bacteria convert the products of the previous two stages into methane and carbon dioxide. Among them, the hydrolysis stage is the main rate-limiting stage in the anaerobic fermentation process.

[0005] Currently, most of the anaerobic fermentation processes in large-scale organic garbage anaerobic biogas projects in China are full-mixed anaerobic fermentation processes, i.e. organic matter completes the processes of hydrolysis, acid production and biogas production in one anaerobic fermentation device, and contains a complex bacteria system of hydrolysis bacteria, acid-producing bacteria and methanogenic bacteria in the same device. In the process of organic matter decomposition and digestion, the bacteria system of the corresponding stage will dominate in different reaction stages, which will affect the activity of methanogenic bacteria to some extent, thus causing incomplete degradation of organic matter and low utilization efficiency of anaerobic fermentation device. UTILITY MODEL CONTENT

[0006] The utility model aims to provide a kind of organic waste dry anaerobic fermentation system to solve the technical problems of incomplete degradation of organic matter and low efficiency in existing device.

[0007] The utility model provides a kind of organic waste dry anaerobic fermentation system, adopts the following technical scheme:

[0008] An organic waste dry anaerobic fermentation system, comprising:

[0009] a hydrolysis system, comprising a hydrolysis tank;

[0010] an anaerobic system, comprising a dry anaerobic bin;

[0011] a first material conveying device for conveying material in the hydrolysis system into the dry anaerobic bin;

[0012] a pipeline mixer, an inlet of the pipeline mixer being connected with a raw material pipe and a reflux pipe, the other end of the reflux pipe being communicated with a material outlet of the dry anaerobic bin, and a first branch pipe extending into the hydrolysis tank being communicated with the wall of the reflux pipe.

[0013] Preferably, a second branch pipe extending into the dry anaerobic bin is further communicated with the wall of the reflux pipe.

[0014] Preferably, a check valve is arranged on the wall of the reflux pipe, and a plurality of groups of the check valve are arranged.

[0015] Preferably, the hydrolysis system further comprises an air induction fan and an activated carbon tank, air pipes are respectively communicated with an air inlet and an air outlet of the air induction fan, one group of the air pipes extends to the top of the hydrolysis tank, and the other group of the air pipes extends to the activated carbon tank.

[0016] Preferably, one end of the first branch pipe inside the hydrolysis tank extends to the top of the hydrolysis tank.

[0017] The height of the air pipe connected with the air inlet of the air induction fan inside the hydrolysis tank is higher than the first branch pipe.

[0018] Preferably, the hydrolysis system further comprises an aeration device, a first temperature control device, a vertical agitator, and a first monitoring instrument group.

[0019] The first monitoring instrument group comprises a first pH meter, a redox potential meter, a first liquid level meter, a first thermometer, a first pressure gauge, and a first hazardous gas alarm instrument, and the first monitoring instrument group acts on the hydrolysis tank.

[0020] The aeration device is communicated with an aeration pipe at the bottom of the hydrolysis tank.

[0021] The first temperature control device is used for controlling the temperature of the hydrolysis tank.

[0022] The vertical agitator is used for agitating the material in the hydrolysis tank.

[0023] Preferably, a sampling pipe is communicated with the bottom of the hydrolysis tank.

[0024] Preferably, the anaerobic system further comprises a second temperature control device, a horizontal agitator and a second monitoring instrument set;

[0025] The second monitoring instrument set comprises a second pH meter, a second liquid level meter, a second thermometer, a second pressure gauge and a second dangerous gas alarm, and the second monitoring instrument set acts on the dry anaerobic bin;

[0026] The second temperature control device is used for controlling the temperature of the dry anaerobic bin;

[0027] The horizontal agitator is used for stirring the material in the dry anaerobic bin.

[0028] Preferably, the dry anaerobic bin is communicated with a biogas collecting pipe at the top;

[0029] The dry anaerobic bin is communicated with a second material conveying device at the bottom.

[0030] In summary, the present application has the following beneficial technical effects:

[0031] 1. The present application comprises a hydrolysis system, an anaerobic system, a first material conveying device and a pipeline mixer, through the hydrolysis system and the reflux pipe communicated with the pipeline mixer, the hydrolysis stage of the organic waste can be completed in the separate system hydrolysis tank, the organic waste completes the change from macromolecular substances to small molecular organic substances in the hydrolysis tank, and is conveyed into the dry anaerobic bin through the first material conveying device, thereby being beneficial to the rapid absorption and utilization of the microorganisms in the dry anaerobic bin, and solving the problem of slow organic matter degradation speed and low degradation rate caused by high material concentration in the dry anaerobic fermentation system.

[0032] 2. The present application is provided with an air draught fan and an activated carbon tank, the air draught fan transmits the gas in the hydrolysis tank to the activated carbon tank, and the activated carbon tank plays a role of adsorbing and removing peculiar smell. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a structural schematic diagram of an organic waste dry anaerobic fermentation system provided by an embodiment of the present application.

[0034] Mark 1, hydrolysis system; 11, hydrolysis tank; 12, air draught fan; 121, gas pipe; 13, activated carbon tank; 14, aeration device; 15, first temperature control device; 16, vertical agitator; 17, first monitoring instrument set; 18, sampling pipe; 2, anaerobic system; 21, dry anaerobic bin; 22, second temperature control device; 23, horizontal agitator; 24, second monitoring instrument set; 25, biogas collecting pipe; 3, first material conveying device; 4, reflux pipe; 41, first branch pipe; 42, second branch pipe; 43, check valve; 5, raw material pipe; 6, pipeline mixer; 7, second material conveying device. DETAILED DESCRIPTION

[0035] The application will be further described below in conjunction with the accompanying drawings Figure 1 The application will be further described below in conjunction with the accompanying drawings

[0036] The application provides an organic waste dry anaerobic fermentation system, referring to Figure 1 , comprising a hydrolysis system 1, an anaerobic system 2 and a first material conveying device 3, the first material conveying device 3 is used for conveying the material in the hydrolysis system 1 into the anaerobic system 2, the discharge port of the anaerobic system 2 is communicated with a reflux pipe 4, the feed inlet of the hydrolysis system 1 is provided with a raw material pipe 5, the raw material pipe 5 and the reflux pipe 4 are jointly communicated with a pipeline mixer 6, and the pipeline mixer 6 is used for conveying the material into the hydrolysis system 1.

[0037] The application will be further described below in conjunction with the accompanying drawings Figure 1 , the organic waste in the embodiment is crushed and pulped, so that the diameter of the organic waste is not greater than 8 mm, and then the organic waste is conveyed into the pipeline mixer 6 through the raw material pipe 5. The hydrolysis system 1 comprises a hydrolysis tank 11, the anaerobic system 2 comprises a dry anaerobic bin 21, the pipeline mixer 6 in the embodiment is communicated with the middle part of the hydrolysis tank 11 through a pipeline, one end of the reflux pipe 4 away from the pipeline mixer 6 is communicated with the discharge port of the dry anaerobic bin 21, and the pipe wall of the reflux pipe 4 is communicated with a first branch pipe 41 extending into the inside of the hydrolysis tank 11, the first branch pipe 41 extends towards the top of the hydrolysis tank 11, the concentration of the material at the top of the hydrolysis tank 11 is low, and the material has good fluidity. The source of the hydrolysis bacterial population in the hydrolysis tank 11 in the embodiment comprises the dry anaerobic bin 21 and the hydrolysis tank 11, the material in the dry anaerobic bin 21 enters the pipeline mixer 6 through the reflux pipe 4, the material in the hydrolysis tank 11 enters the pipeline mixer 6 through the first branch pipe 41 and the reflux pipe 4, and the pipeline mixer 6 then conveys the material into the hydrolysis tank 11, so that the bacterial population in the hydrolysis tank 11 can be continuously supplemented. The pipeline mixer 6 is used for fully stirring the material in the pipeline mixer 6, so that the high-concentration slurry entering the hydrolysis tank 11 can be uniformly distributed, and the phenomenon that the hydrolysis bacterial population cannot be fully mixed with the material is avoided.

[0038] The application will be further described below in conjunction with the accompanying drawings Figure 1 , the hydrolysis system 1 further comprises an air drafter 12 and an activated carbon tank 13, and the activated carbon tank 13 in the embodiment is arranged below the hydrolysis tank 11. The air inlet and the air outlet of the air drafter 12 are respectively communicated with air pipes 121, one group of air pipes 121 extends to the top of the hydrolysis tank 11, and the air pipe 121 connected to the air inlet of the air drafter 12 is located at a height higher than the first branch pipe 41 in the hydrolysis tank 11, and the other group of air pipes 121 extends to the activated carbon tank 13. The air in the hydrolysis tank 11 is transmitted into the activated carbon tank 13 through the air pipes 121 under the action of the air drafter 12, and the activated carbon tank 13 has the effect of removing odor. The air in the embodiment is introduced to the outside for treatment after being treated by the activated carbon tank 13.

[0039] With reference to Figure 1 , the hydrolysis system 1 further comprises an aeration device 14, a first temperature control device 15, a vertical agitator 16 and a first monitoring instrument set 17, the first monitoring instrument set 17 in the embodiment comprises a first pH meter, a redox potential meter, a first liquid level meter, a first thermometer, a first pressure gauge and a first dangerous gas alarm instrument. The online instruments such as the first pH meter, the redox potential meter, the first liquid level meter, the first thermometer, the first pressure gauge and the first dangerous gas alarm instrument act on the hydrolysis tank 11 to monitor the working state of the hydrolysis tank 11 in real time; the aeration device 14 is communicated with the aeration pipe 121 at the bottom of the hydrolysis tank 11, and the aeration device 14 is arranged to destroy the anaerobic state in the hydrolysis tank 11 and make the hydrolysis bacterial flora become the dominant flora; the first temperature control device 15 in the embodiment is any one of the internal coil of the hydrolysis tank 11 or the external heat exchanger, which is needed to cool the materials in the hydrolysis tank 11 in summer and to keep the materials in the hydrolysis tank 11 warm in winter, so that the temperature in the hydrolysis tank 11 is maintained at 20-25℃, and the purpose is to destroy the activity of the anaerobic bacterial flora and make the hydrolysis bacterial flora become the dominant flora; the vertical agitator 16 is used to agitate the materials in the hydrolysis tank 11.

[0040] With reference to Figure 1 , the hydrolysis tank 11 is communicated with a sampling pipe 18 at the bottom, so that sampling can be performed at any time for external experiments, and the purpose is to detect indexes that cannot be detected by the online instruments and to verify the indexes detected by the online instruments.

[0041] With reference to Figure 1 , the dry anaerobic bin 21 is used to communicate with the feed inlet of the first material conveying device 3, and the feed inlet is located at 1 / 3 of the height of the dry anaerobic bin 21, and the anaerobic bacterial flora at this position of the dry anaerobic bin 21 is rich, can quickly carry out methanogenic reaction, and has strong impact resistance. And the first material conveying device 3 in the embodiment is a screw pump to convey the materials.

[0042] With reference to Figure 1The discharge port of the dry anaerobic bin 21 is connected with a second material conveying device 7, and the second material conveying device 7 in the embodiment is a screw pump for conveying the material.

[0043] With reference to Figure 1 The anaerobic system 2 further comprises a second temperature control device 22, a horizontal agitator 23 and a second monitoring instrument group 24, wherein the second monitoring instrument group 24 in the embodiment comprises a second pH meter, a second liquid level meter, a second thermometer, a second pressure gauge and a second dangerous gas alarm instrument; the second pH meter, the second liquid level meter, the second thermometer, the second pressure gauge and the second dangerous gas alarm instrument are used for the dry anaerobic bin 21 and are used for monitoring the working state of the dry anaerobic bin 21 in real time; the second temperature control device 22 is used for controlling the temperature of the dry anaerobic bin 21, and the second temperature control device 22 in the embodiment is any one of an internal coil or an external heat exchanger of the dry anaerobic bin 21, so that the temperature in the dry anaerobic bin 21 is maintained at 35-39 DEG C; and the horizontal agitator 23 is used for agitating the material in the dry anaerobic bin 21.

[0044] With reference to the drawings, the top of the dry anaerobic bin 21 is communicated with a biogas collecting pipe 25, so as to send the generated biogas to a subsequent treatment process, and the generated biogas pressure is ≤3kpa.

[0045] The implementation principle of the organic waste dry anaerobic fermentation system is as follows:

[0046] The organic waste is crushed and pulped and then enters the pipeline mixer 6, at this time, the material in the dry anaerobic bin 21 enters the pipeline mixer 6 through the second conveying device 7 and the reflux pipe 4, the material in the hydrolysis tank 11 enters the pipeline mixer 6 through the first branch pipe 41 and the reflux pipe 4, after the pipeline mixer 6 stirs the material uniformly, the material is transmitted to the hydrolysis tank 11 through a pipeline, so that the bacterial flora in the hydrolysis tank 11 can be continuously supplemented, and the material produced by the hydrolysis tank 11 enters the dry anaerobic bin 21 through the first conveying device 3; the process makes the hydrolysis stage of the organic waste be completed in the hydrolysis tank 11 of a separate system, the macromolecular material in the organic waste is changed into small molecular organic material in the hydrolysis tank 11, and is conveyed to the dry anaerobic bin 21 through the first conveying device 3, so that the rapid absorption and utilization of the microorganism in the dry anaerobic bin 21 are facilitated, and the problems of slow degradation speed and low degradation rate of the organic matter caused by high material concentration in the dry anaerobic fermentation system are solved.

[0047] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A dry anaerobic fermentation system for organic waste, characterized in that, include: Hydrolysis system (1), the hydrolysis system (1) includes a hydrolysis tank (11); Anaerobic system (2), the anaerobic system (2) includes a dry anaerobic chamber (21); The first conveying device (3) is used to convey the material in the hydrolysis system (1) to the dry anaerobic chamber (21); Pipe mixer (6), the feed inlet of the pipe mixer (6) is connected to the raw material pipe (5) and the return pipe (4), the other end of the return pipe (4) is connected to the discharge port of the dry anaerobic chamber (21), and the pipe wall of the return pipe (4) is connected to the first branch pipe (41) extending into the hydrolysis tank (11). The hydrolysis system (1) also includes a blower (12) and an activated carbon box (13). The inlet and outlet of the blower (12) are respectively connected to air pipes (121). One set of air pipes (121) extends to the top of the hydrolysis tank (11), and the other set of air pipes (121) extends to the activated carbon box (13). The first branch pipe (41) extends from one end inside the hydrolysis tank (11) toward the top of the hydrolysis tank (11); The air pipe (121) connected to the air inlet of the blower (12) is located at a height higher than the first branch pipe (41) inside the hydrolysis tank (11).

2. The dry anaerobic fermentation system for organic waste according to claim 1, characterized in that, The wall of the return pipe (4) is also connected to a second branch pipe (42), and the other end of the second branch pipe (42) extends into the dry anaerobic chamber (21).

3. The dry anaerobic fermentation system for organic waste according to claim 2, characterized in that, The return pipe (4) is provided with a check valve (43) on its wall, and multiple sets of the check valve (43) are provided.

4. The dry anaerobic fermentation system for organic waste according to claim 1, characterized in that, The hydrolysis system (1) also includes an aeration device (14), a first temperature control device (15), a vertical stirrer (16), and a first monitoring instrument group (17). The first monitoring instrument group (17) includes a first pH meter, a redox potentiometer, a first level gauge, a first thermometer, a first pressure gauge and a first hazardous gas alarm. The first monitoring instrument group (17) acts on the hydrolysis tank (11). The aeration device (14) is connected to the bottom of the hydrolysis tank (11) by an aeration pipe (121). The first temperature control device (15) is used to control the temperature of the hydrolysis tank (11); The vertical agitator (16) is used to agitate the materials in the hydrolysis tank (11).

5. The dry anaerobic fermentation system for organic waste according to claim 4, characterized in that, The bottom of the hydrolysis tank (11) is connected to a sampling tube (18).

6. The dry anaerobic fermentation system for organic waste according to claim 1, characterized in that, The anaerobic system (2) also includes a second temperature control device (22), a horizontal stirrer (23), and a second monitoring instrument group (24); The second monitoring instrument group (24) includes a second pH meter, a second level gauge, a second thermometer, a second pressure gauge, and a second hazardous gas alarm. The second monitoring instrument group (24) is used in the dry anaerobic chamber (21). The second temperature control device (22) is used to control the temperature of the dry anaerobic chamber (21); The horizontal mixer (23) is used to stir the materials in the dry anaerobic chamber (21).

7. The dry anaerobic fermentation system for organic waste according to claim 6, characterized in that, The top of the dry anaerobic chamber (21) is connected to a biogas collection pipe (25). The bottom of the dry anaerobic chamber (21) is connected to a second material conveying device (7).

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